JPH09311709A - Machining program generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a machining program which machines a work with specified surface precision even if the machining shape is complicated by judging the degree of variation in the gradient of a curved surface group constituting the machining shape on the basis of machining shape data and machining condition data, and determining the pick width of a tool path. SOLUTION: Tool data, pitch width, machining direction, and feed speed are sent out of an input means 100 for machining shape data and machining condition data to a contact point decision means 140 as the machining shape data and machining condition data, and the center point and contact point of a tool which are calculated are sent out of a tool path data generating means 110. The contact point decision means 140 decides the degree of variation in the gradient of the curved surface group constituting the machining shape on the basis of the contact point and contact point distribution chart and sends the decision result to a pick width determining means 150, which determines the pick width of the tool path so that the surface precision of the machining shape is made constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining program creating apparatus capable of efficiently creating a machining program for machining a workpiece.

[0002]

2. Description of the Related Art A conventional example of a machining program creating apparatus capable of creating a machining program will be described below. FIG. 17 is a block diagram showing a machining program creating apparatus. As shown in the figure, this machining program creating apparatus is composed of a computer and its peripheral devices.
In the figure, 10 is shown as a computer, 10 is a main component of the information processing unit, 10a is a CPU for executing various calculations, and 10b is a non-volatile storage of programs and various data essential for the calculations. R
The OM 10c is a RAM for temporarily storing information to assist the operation of the CPU 10a, and the information processing unit 1 is a RAM 10d.
0 is an input / output circuit for exchanging information between 0 and peripheral devices.

Further, among the peripheral devices illustrated above, 20 is a keyboard for inputting keys such as characters, numerical values and various symbols, 30 is a function key for inputting various commands, and 40 is a position of a figure or the like. A tablet for inputting information, 50 is a mouse for selecting and instructing characters, graphic elements and various symbols on the CRT 60, 60 is a high resolution CRT suitable for displaying three-dimensional images, and 70 is for outputting drawings and the like. An XY plotter, a floppy disk 80 as an external storage device for storing drawing information and a machining program, a hard disk as an external storage device 90 for storing a large-capacity drawing and a machining program, and these peripheral devices 20 to 90 are Both are connected to the input / output circuit 10d of the information processing unit 10.

In the machining program creating apparatus configured as described above, various execution programs are stored in the ROM 10
It is stored in advance in the hard disk 90 including b.
The work is performed by inputting necessary data by selecting and activating these programs at appropriate times by inputting from the keyboard 20, function keys 30, tablet 40 or mouse 50.

[0005] Then, the process of performing this task is high resolution CR.
The completed drawings and the like are displayed on T60 as timely graphics, and the completed drawings and the like are output to the XY plotter 70, and the machining programs and the like are stored in the floppy disk 80 and the hard disk 90.

In the above description, the machining program is a control command for controlling a numerically controlled machine tool such as a machining center to obtain a final shape from a material work.

Next, the operation of the conventional device will be described with reference to FIG. FIG. 18 is a block diagram showing the operation of the machining program creating apparatus. In the figure, 300 is an input means for the machining shape data md and the machining condition data. The machining shape data md is data composed of a plurality of curved surface groups, and the machining condition data includes tool data td and pick width p.
It is data necessary for machining such as k, machining direction dr, and feed rate cv. Reference numeral 310 denotes a tool path data creating means, which obtains a tool trajectory from the machining shape data and machining condition data. 320 is a numerical control data conversion means, 330 is a tool path data display means, 340 is a tool,
Reference numeral 350 is a curved surface of a processed shape. In the above-described configuration, generally, in the process of creating the tool path data, first, the contact point cp where the tool 340 and the curved surface 350 of the machining shape are in contact is calculated, and the coordinate value of the tool center tp with respect to the obtained contact point cp is calculated. It The coordinate value group of the tool center tp becomes the tool path data. The tool path data creating means 110 can sequentially output the contact points cp and the tool center points tp one by one, and collectively store a plurality of contact point cp groups and tool center points tp groups in an array and output them. You can also As an example of the tool path data creating means, there is a "real-time tool path generation method by curved surface division" by Mr. Kato and Mr. Kato of the 1994 Precision Engineering Society Spring Conference Academic Lecture. Then, the numerical control data conversion means 320 converts the tool path data tp into numerical control data NC and outputs it. Further, the tool path data display means 330 displays C
It is displayed as a graphic on the RT60 and is used for checking the tool path.

Further, according to Japanese Patent Laid-Open No. 5-173622, a determination means for calculating a gradient of a processed shape surface group forming a recessed ridge line included in the processed shape and determining a degree of change based on the recessed ridge line. have. The calculation of the gradient is performed by obtaining the point on the surface of the processed shape on the concave ridge and the normal vector, and then obtaining the angle between the horizontal plane and the normal vector.
Further, the determination means for determining the degree of change is performed by comparing the magnitudes of the angles.

Further, according to JP-A-61-103206,
Pick up the ridgeline of the machining shape and set the reference tool path, set the machining conditions such as machining direction and pick width,
There is a machining method that creates tool path data.

[0010]

Since the conventional machining program creating apparatus is configured as described above, it has the following problems.

The pick width pk set by the processing condition data input means 300 is always fixed, although the respective surfaces of the processed shape data have different slopes. Therefore, for example, in the machining shape as shown in FIG. 19A, the tool path 350 to be machined with a constant pick width pk has a large gap between the tool paths at the surface 360 having a steep slope. As a result, FIG.
As shown in (b), when the cross section of the steep slope 360 is seen, the uncut portion 380 is larger than the uncut portion 390 in the plane portion,
The surface accuracy becomes uneven. Therefore, the operator of the machining program creation device must set the pick width pk to a small value in accordance with the steep slope 360 in order to obtain a desired surface accuracy, and as a result, a machining program that creates a long machining time is created. There was a problem.

Further, there is a problem that the operator has to separately prepare a machining program for machining a flat surface portion and a machining program for machining a steep slope surface portion in order to make the surface accuracy uniform.

Further, in order to calculate the gradient of the surface of the machined shape, the coordinate values of the points on the surface, the normal vector of each point, and the angle formed by the normal vector with respect to the horizontal plane are obtained. There is a problem in that the amount of calculation is very large and the machining program creation time increases.

Further, the tool feed rate cv set by the machining condition data input means 300 is always determined to be constant, although each surface of the machining shape data has different slopes. . Therefore, for example, FIG.
In the machining shape as shown in, the tool path 400 for machining at the constant feed speed cv has a large change in the cutting amount at the surface 410 having a steep slope. 20B, the cross section of the steep slope 410 shows a cutting amount 460 in the moving direction 440 of the tool 420 and a cutting amount 470 in the moving direction 450 with respect to the cutting allowance 430. Therefore, there is a problem that the load applied to the tool changes in the moving direction of the tool, the life of the tool is shortened, and the surface accuracy is further deteriorated.

Further, the operator has to decide the feed rate cv to be small on the basis of the place where the cutting load becomes large, and as a result, there is a problem that a machining program that makes the machining time long is created.

Further, when the processing shape is cut, as shown in FIG.
Cutting for machining the cutting allowance 510 in the moving direction and the rotating direction of the tool 500 as shown in FIG. 1 (a) is called up-cut.
Cutting for machining the cutting allowance 510 in the moving direction and the rotating direction of the tool 500 as shown in FIG. 21B is referred to as downcut. Upcut and downcut are generally known to affect cutting efficiency, tool life, and machining accuracy. The operator of the machining program creating apparatus creates a machining program by deciding whether to machine the machining shape by down-cutting or up-cutting. However, when the processing shape is a complicated curved surface shape having irregularities, it is difficult to process only the same down cut or only up cut until the end. Therefore, the operator sets the ratio of the determined cutting direction as much as possible. But,
There is a problem that the ratio of up-cut and down-cut cannot be quantitatively determined only by the created tool path.

When a steep surface 410 as shown in FIG. 20 (b) is further machined to have a slope that is closer to a vertical wall in the moving direction 450, the cutting amount 470 is used.
Causes tool damage over the entire length of the tool. The operator must create a machining program so as to avoid such machining, and also check whether the machining of the vertical wall as described above is present in the created machining program only from the tool path. There was a problem that the work load increased.

Further, when the gradient of the machining shape is calculated for all tool path points tp, there is a problem that the amount of calculation becomes large and the machining program creation time increases.

There are many kinds of tools used for machining. When calculating the gradient of the machined shape, there is a problem in that the calculation must be made according to the characteristics of the tool.

There are various kinds of tools used for machining. The optimum range of feed rate differs depending on the characteristics of the tool,
When a machining program is created for each machining shape gradient, the feed rate must be set for each machining program, which causes a problem of increasing the work load on the operator.

The present invention has been made to solve the above problems, and a machining program creating apparatus capable of obtaining a machining program for machining with a specified surface accuracy even if the machining shape is complicated. Aim to get.

Further, there is provided a machining program creating apparatus capable of obtaining a machining program which can obtain a designated surface accuracy and can significantly shorten the machining time without setting the pick width small in accordance with a steep surface. The purpose is to

Furthermore, it is an object of the present invention to provide a machining program creating apparatus capable of obtaining a machining program for machining in one machining step even if the machining shape has a complicated shape without dividing the machining step into a plurality of steps. To do.

Further, an object of the present invention is to obtain a machining program creating apparatus which can easily calculate the degree of change in the gradient of the machining shape without complicated calculations and can significantly reduce the machining program creating time. To do.

Another aspect of the present invention is that the machining feed rate of the tool can be changed according to the cutting amount of the tool, the load of the tool can be reduced, and the life of the tool can be extended. It is an object of the present invention to provide a machining program creating apparatus capable of performing the above-mentioned processing and preventing deterioration of surface accuracy.

Further, the operator does not have to reduce the feed rate on the basis of the place where the cutting load is large, and as a result, it is an object of the invention to obtain a machining program creating apparatus capable of creating a machining program with a significantly shortened machining time. To do.

Further, in another invention of the present invention, the graph for determining the feed rate can be changed, the feed rate can be determined according to the type of tool and the material work, and an optimum machining program can be created. The purpose is to obtain a machining program creation device.

Further, another object of the present invention is to provide a machining program creating apparatus capable of easily confirming up-cut and down-cut which are machining directions at the time of cutting on a display screen such as a CRT.

Further, according to another invention of the present invention, it is possible to easily find the machining of the vertical wall portion where the load of the tool becomes extremely large, and to significantly reduce the work load of the operator. Aim to get.

Further, another object of the present invention is to provide a machining program creating apparatus capable of performing processing for each line of a tool path and further shortening the time required for creating the machining program.

Still another object of the present invention is to provide a machining program creating apparatus capable of changing a contact point distribution map and creating an optimum machining program according to a large number of tool types. .

[0032]

A machining program creating apparatus according to the present invention includes machining shape data representing a machining shape, machining condition data representing machining conditions for machining this machining shape, and these machining shape data and Contact point determination means for determining the degree of change in the gradient of the curved surface group forming the processing shape based on the processing condition data, and pick width determination for determining the pick width of the tool path based on the determination result of the contact point determination means. And means.

A machining program creating apparatus according to another invention of the present invention includes machining shape data representing a machining shape, machining condition data representing machining conditions for machining this machining shape, and these machining shape data and machining conditions. Contact point determining means for determining the degree of change in the gradient of the curved surface group forming the machining shape based on the data, and feed rate determining means for determining the machining feed rate of the tool path based on the determination result of the contact point determining means. It is equipped with and.

In a machining program creating apparatus according to another invention of the present invention, the feed rate determining means has a graph as a comparing means, and the machining feed rate of the tool path is determined based on the graph. The graph is adapted to be modified by the graph modifying means.

A machining program creating apparatus according to another invention of the present invention is machining shape data representing a machining shape, machining condition data representing machining conditions for machining this machining shape, and these machining shape data and machining conditions. Contact point determining means for determining the degree of change in the gradient of the curved surface group forming the machining shape based on the data, and a cutting direction for determining upcut and downcut of the tool path based on the determination result of the contact point determining means. The determination means and the cutting direction display means for displaying a distinction between upcut and downcut on the trajectory of the tool path based on the determination result of the cutting direction determination means.

A machining program creating apparatus according to another invention of the present invention includes machining shape data representing a machining shape, machining condition data representing machining conditions for machining this machining shape, and these machining shape data and machining conditions. Contact point determining means for determining the degree of change in the gradient of the curved surface group forming the machining shape based on the data, and vertical wall determining means for determining the vertical wall portion of the tool path based on the determination result of the contact point determining means. And a vertical wall display means for displaying a distinction between the vertical wall portions on the trajectory of the tool path based on the determination result of the vertical wall determination means.

A machining program creating apparatus according to another invention of the present invention is a machining shape data representing a machining shape, machining condition data representing a machining condition for machining the machining shape, the machining shape data and the machining condition. Based on the data, a tool center point group and a contact point group are calculated, and tool path data creating means for creating tool path data, and a tool center point group and a contact point group for one line created by this tool path data creating means And a contact point determination means for determining the degree of change in the gradient of the curved surface group forming the processed shape.

In the machining program creating apparatus according to another invention of the present invention, the contact point determination means has a contact point distribution chart as a comparison means, and a group of curved surfaces forming a machining shape based on the contact point distribution chart. The contact point distribution map is changed by the contact point distribution map changing means for determining the degree of change in the gradient.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG. 1 by taking a machining program creating apparatus as an example.

FIG. 1 is a block diagram showing an example of a machining program creating apparatus using the present invention in association with FIG. In the figure, 100 is an input means of machining shape data / machining condition data, 110 is a tool path data creating means, 1
20 is numerical control data conversion means, 130 is tool path data display means, 140 is contact point determination means, 1
50 is a pick width determining means, 160 is a feed rate determining means,
170 is a cutting direction determination means, 20 is a cutting direction display means,
190 is a vertical wall determination means, 200 is a vertical wall display means, 2
10 is contact point group determination means, 220 is contact point distribution map changing means, 230 is graph changing means, md is machining shape data, td is tool data, pk is pick width, pk 'is new pick width, and dr is machining. direction,
cv is a feed rate, cv 'is a new feed rate, h is a surface accuracy, cp is a contact point, cpn is a contact point group, tp is a tool center point, tp' is a new tool center point, tpn is a tool center point group, tpn 'is a new tool center point group, ud is a cutting direction determination result, vt is a vertical wall determination result, r is an XY plane projection distance between the contact point and the tool center point, and MAP1 is contact point distribution map information for contact point determination means. , MAP2 is contact point distribution map information for contact point group determination means, JD
1 is the judgment result by the contact point judging means, JD
2 is the result of judgment by the contact point group judgment means, G
RP is graph information for determining the feed rate.

Next, each configuration and operation shown in FIG. 1 will be described. First, the tool path data creating means 11
0 will be described. This tool path data creating means 11
0 is input means 1 for processing shape data / processing condition data
From 00, tool data td, pick width pk, machining direction dr, and feed speed cv are sent as machining shape data md and machining condition data. Then, the tool path data creation unit 110 calculates the tool center point tp and the contact point cp, and further the tool center point group tpn and the contact point group cpn as the tool path data based on the machining shape according to the machining conditions. (Note that the tool center point group tp
The usage pattern of n and the contact point group cpn will be described later. )

Next, the contact point determining means 140 will be described. This contact point determination means 14
In 0, the degree of change in the gradient of the curved surface group forming the machining shape is determined based on the contact points where the tool and the machining shape are in contact and the contact point distribution chart. The processing point data m is input to the contact point determining means 140 from the processing shape data / processing condition data input means 100.
The tool data td, the pick width pk, the machining direction dr, and the feed speed cv as d and machining condition data, and the calculated tool center point tp and contact point cp are sent from the tool path data creating unit 110. The contact point determining means 140 determines the degree of change JD1 of the gradient of the curved surface group forming the processed shape based on the contact points cp and the contact point distribution chart. Here, if the contact point cp is in contact with, for example, the tip of the tool, the gradient change degree JD1 can be determined to be horizontal,
If the contact is made at a portion slightly away from the center of the tool, it can be determined that the gradient is inclined.

A contact point distribution chart is used for this determination. FIG. 2 is a diagram showing an example of a contact point distribution diagram. In FIG. 2A, 550 is a tool, 560
Is a curved surface that is in contact with the tool 550 at the contact point cp, and the tool center point of the tool path at that time is the point tp.
570 is a contact point distribution chart, and the tool 550
Is divided into areas with respect to the contour projected on the xy plane. The contact point cp corresponds to the position shown in the contact point distribution map 570. That is, the contact point cp is represented by the contact point distribution map 57.
0 is a point projected on the xy plane. Next, each area of the contact point distribution chart 570 will be described based on FIG. In FIG. 2B, the area of the contact point distribution chart 570 shows an example divided into six areas.
Area A is an area determined to be in contact with the tip of the tool, area B is an area determined to be in front of the tool moving direction dr and in contact with an upslope surface, and area C is an area B. On the other hand, an area which is on the rear side with respect to the tool moving direction dr and which is determined to be in contact with the descending slope surface,
Area D is an area that is determined to be in contact with the tool movement direction dr on the right slope surface, and area E is an area that is opposite to area D and is determined to be contacted on the left slope surface in the tool movement direction dr. , Area F is an area determined to be in contact with the side surface of the tool. For example, area D and area E
When it is determined that the tool is in contact with both of the areas, it is an area in which the tool is moved along the concave ridge and is in contact with both the left and right surfaces. The result JD1 determined based on the contact point distribution chart as described above is sent to the pick width determining means shown in FIG.

FIG. 3 shows the contact point determining means 140.
10 is a flowchart for explaining the operation of step S10.
Is a step of receiving machining shape data and machining condition data, step 20 is a step of receiving contact point cp and tool center point tp, and step 30 is obtaining a distance r between the contact point cp and tool center tp on a plane projected on the XY plane. A step of comparing whether the distance r is within the radius of the area A, the radius of the area BCDE or the radius of the area F, and step 40 is a step of determining whether the distance r is within the radius of the area BCDE as a result of the comparison. If the area BCDE is not within the range of step 40, step 50 is executed. Step 50 is a step of setting the area A to the determination result JD1 if the distance r is within the area A and setting the area F to the determination result JD1 if within the area F and outputting the determination result JD1. Yes, if the distance r is within the area BCDE, step 60 is executed. Step 60 is a step of obtaining an angle α formed by the tool moving direction dr and the direction from the tool center point tp to the contact point cp, and step 70 is an angle α.
Is compared with the angular range of areas B, C, D, and E, and step 80 determines the classification result J
This is a step of setting to D1 and outputting.

Next, the pick width determining means 150 will be described. The pick width determining means 150 determines the pick width of the tool path so that the surface accuracy of the processed shape is constant. The pick width determination means 150 calculates a new pick width pk ′ in order to maintain the specified surface precision only when the pick width pk needs to be changed in the judgment result of the judgment result JD1. The pick width pk determined by the pick width determining means 150 or the new pick width p
k ′ is sent to the tool path data creating means 110. When the tool path data generation unit 110 receives the new pick width pk ′, the tool path data generation unit 110 creates the tool path data again and sends the new tool center point tp ′ to the numerical control data conversion unit 120. When the pick width pk is received, the previous tool center point tp is sent out. Numerical control data conversion means 12
0 converts the received tool center point tp or tp 'into numerical control data and outputs it as NC data. Further, NC data is sent to the tool path data display means 130. The tool path data display means 130 displays the tool path on the CRT.

FIG. 4 is a flow chart for explaining the operation of the pick width determining means 150. Step 100 is the step of receiving the surface accuracy h which is one of the processing conditions, step 110 is the step of receiving the judgment result JD1, and step 120 is the step. In the step of determining whether the determination result JD1 is the area D or the area E in the area BCDE, if the area B or the area C, the step 130 is executed. In step 130, the already obtained pick width pk is output as it is. If the determination result JD1 is the area D or the area E, step 140 is executed. Step 140
Is a step for obtaining a new pick width pk ′, and the calculation formula is as shown in the flowchart. In step 140, h is the surface accuracy, R is the tool radius, tp
z is the Z coordinate value of the tool center point tp, and cpz is the Z coordinate value of the contact point cp. Moreover, | · | is an operator that takes an absolute value. Step 150 is a step of outputting the newly calculated pick width pk ′.

Next, the feed rate determining means 160 will be described. The feed rate determining means 160 determines the machining feed rate of the tool path based on the graph. The determination result JD1 determined by the contact point determination means 140 is sent to the feed speed determination means 160. Then, the feed rate determination means 160 calculates a new feed rate cv 'only when the feed rate needs to be changed based on the determination result JD1 and the feed rate determination graph.

FIG. 5 is a diagram showing a feed rate determination graph for calculating a new feed rate cv 'by the feed rate determining means 160, where the horizontal axis represents the distance r and the vertical axis represents the feed rate ratio k. It is a Gaussian curve that becomes stepwise. The domain of the abscissa is {r: 0 ≦ r ≦ R}, and R is the tool radius. The value range on the vertical axis is {k: 0 ≦ k ≦ 1}. The distance r is the distance obtained by projecting the contact point cp from the tool center tp on the XY plane. For example, when the distance r is r = 0.75R, the feed rate ratio k is k = 0.5. The feed speed cv determined by the feed speed determination means 160 or a new feed speed cv ′ is sent to the numerical control data conversion means 120. The numerical control data conversion means 120 converts the received feed speed cv or the new feed speed cv ′ into numerical control data and outputs it as NC data. Further, NC data is sent to the tool path data display means 130.
The tool path data display means 130 displays the tool path on the CRT.

An example of the operation of the feed rate determining means 160 having such a configuration will be described with reference to the flowchart of FIG.
Step 160 is a step of receiving the determination result JD1,
Step 170 is a step of receiving the distance r, step 20 is a step of judging whether the judgment result JD1 is the area C, and if the judgment result JD1 is not the area C, step 19
Execute 0. In step 190, the current feed speed cv is output as it is, and when the determination result JD1 is the area C, step 200 is executed. Step 200 is a step of obtaining the feed rate ratio k from the feed rate determination graph from the distance r, and step 210 is a new feed rate cv '.
In the step of obtaining, cv ′ = k · cv. Step 220 is a step of outputting the obtained feed speed cv '.

Next, the cutting direction determination means 170 and the cutting direction display means 180 will be described. The cutting direction determining means 170 determines upcut (upward cutting) and downcut (downward cutting) of the tool path.
Further, the cutting direction display means 180 displays a distinction between upcut and downcut on the trajectory of the tool path. To the cutting direction determining means 170, the determination result JD1 is sent by the contact point determining means 140, which determines the degree of change JD1 of the gradient of the curved surface group forming the machining shape based on the contact points cp and the contact point distribution chart. . The cutting direction determining means 170 determines the determination result JD.
Determine from 1 to up cut down cut. Further, the determined cutting direction determination result ud is sent to the cutting direction display means 180. The cutting direction display means 180 changes the display color of the current tool path from the cutting direction determination result ud to the designated color of upcut or downcut and displays it on the CRT.

An example of the operation of the cutting direction determination means 170 and the cutting direction display means 180 in such a configuration will be described with reference to the flowcharts of FIGS. 7 and 8. FIG. 7 is a flowchart explaining the operation of the cutting direction determination means 170,
Step 230 is a step of receiving the determination result JD1,
Step 240 is a step in which JD1 branches by area. When JD1 is an area other than areas D and E, step 250 is executed. In step 250, NOP is output as the cutting direction determination result ud. Note that NOP indicates that nothing is done. If JD1 is in area D, step 260
To execute. Step 260 is a step of outputting a downcut to the cutting direction determination result ud, where JD1 is the area E.
Then step 270 is executed. Step 270 is a step of outputting upcut to the cutting direction determination result ud.

FIG. 8 is a flow chart for explaining the operation of the cutting direction display means 180. Step 280 is a step of receiving the cutting direction judgment result ud, step 290 is a step of branching according to the value of ud, and when ud is NOP step. Execute 300. Step 300 is a step of changing the tool path display color to the display color in the initial state.
When d is upcut, step 310 is executed.
Step 310 is a step of changing the tool path display color to the upcut display color, and when ud is downcut, step 320 is executed. Step 320 is a step of changing the tool locus display color to the downcut display color, and step 330 is a step of displaying the current tool locus in the current display color.

Next, the vertical wall determination means 190 and the vertical wall display means 200 will be described. This vertical wall determination means 19
0 is for determining the path of the vertical wall portion of the tool path. Further, the vertical wall display means 200 displays the vertical wall portion distinction on the trajectory of the tool path. The vertical wall determining means 190 includes contact point determining means 140.
The determination result JD1 determined based on the contact point cp and the contact point distribution map is transmitted. Then, the vertical wall determining means 190 determines from the determination result JD1 whether the tool path is the vertical wall portion. Vertical wall display means 2
The vertical wall determination result vt determined by the vertical wall determination means 190 is sent to 00. This vertical wall display means 2
00 changes the display color of the current tool path from the vertical wall determination result vt to the vertical wall display color and displays it on the CRT.

An example of the operation in such a configuration will be described with reference to the flowcharts of FIGS. 9 and 10. FIG. 9 is a flow chart for explaining the operation of the vertical wall determining means 190. Step 340 is a step of receiving the determination result JD1, step 350 is a step of determining whether JD1 is area F, and when JD1 is not area F, step 360 is executed. , JD1 is in area F, step 370 is executed. Step 360 outputs NOP to the vertical wall determination result vt, and step 370 outputs the vertical wall determination result vt.
Is a step of outputting whether or not it is a vertical wall.

Next, FIG. 10 is a flow chart for explaining the operation of the vertical wall display means 200. Step 380 is a step of receiving the vertical judgment result vt, and step 390.
Is a step of determining whether the vertical wall determination result vt is a vertical wall,
When vt is not a vertical wall, step 400 is executed. Step 400 is a step of changing the tool path display color to the display color in the initial state, and when vt is a vertical wall, step 410
To execute. Step 410 is a step of changing the tool path display color to a vertical wall display color, and step 420 is a step of displaying the current tool path in the current display color on the CRT.

Next, contact point group judgment means 210
Will be described. The contact point group determination means 210 determines the degree of change in the gradient of the curved surface group forming the processed shape based on the contact point group of one line and the contact point distribution chart. The contact point group determination means 210 includes tool path data creation means 1
The tool center point group tpn and the contact point group cpn calculated by 10 are sent out. The contact point group judgment means 210 judges the degree of change JD2 of the gradient of the curved surface group forming the processed shape based on the contact point group cpn and the contact point distribution chart, and outputs JD2. The determination result JD2 can be treated as equivalent to the determination result JD1. Therefore, the above JD1
May be replaced with JD2. In this case, the numerical control data conversion means 120 includes the tool path data creation means 11
0 can send a plurality of tool center point groups tpn as an array.

An example of the operation of the contact point group determination means 210 having such a configuration will be described with reference to the flowchart of FIG. FIG. 11 is a flow chart showing the operation of the contact point group judgment means 210, step 4
30 is a step of receiving machining shape data and machining condition data, and step 440 is a contact point group cpn.
And a step of receiving the tool center point group tpn, step 450 shows a distance r [i] on a plane obtained by projecting the contact point group cpn [i] and the tool center point group tpn [i] on the XY plane in order. The step of obtaining and comparing whether the distance r [i] is within the radius of the area A, the radius of the area BCDE, or the radius of the area F, step 460 shows that the distance r [i] is the radius of the area BCDE. Area BCDE in step 460 in the step of determining whether the range is
If it is not within the range, step 470 is executed. In step 470, if the distance r [i] is within the area A, the area A is set in the determination result JD2, and if within the area F, the area F is set in the determination result JD2.
If the distance r [i] is within the area BCDE, step 480 is executed. Step 480 is the tool movement direction dr
And the contact point cpn from the tool center point tpn [i]
The step of obtaining an angle α formed by the direction to [i], step 490 is a step of comparing which angle range of the areas B, C, D and E the angle α is classified into, step 500.
Is a step of counting the number of determinations for each area of JD2, step 510 is a step of holding the maximum value of the distance r for each area of JD2, and step 520 is a step of determining whether all the contact points of one line are determined. If not all have been determined, the next contact point and tool center point are set and the process returns to step 450 to repeat the process. Step 5 when all lines are completed
Execute 30. Step 530 is a step of outputting the area having the maximum count number for each area as JD2, and step 540 is a step of outputting the maximum distance r in the area of JD2. FIG. 16 shows an example of the tool path locus according to the present embodiment.

Next, the contact point distribution map changing means 2
20 will be described. The contact point distribution map changing means 220 changes the contact point distribution map. The contact point distribution map changing means 220 can interactively change the contact point distribution map. The changed contact point distribution map information MAP1 is sent to the contact point determination means 140, and the changed contact point distribution map information MAP2 is sent to the contact point group determination means 210. Contact point determination means 140 and contact point group determination means 21
At 0, each contact point distribution map is used for judgment.

An example of the operation of the contact point distribution map changing means having such a structure will be described with reference to FIGS. 12 and 13. FIG. 12 is a flow chart for explaining the operation of the contact point distribution map changing means 220.
3 is a diagram showing parameters to be changed in the contact point distribution chart. In FIG. 12, step 550 is a step of selecting the MAP to be changed, and the contact point distribution map information is selected from the contact point distribution map information MAP1 and MAP2. Step 560 is a step for changing the radius Ra, and the radius Ra is a parameter for changing the size of the area A in FIG. Step 570 is a step for changing the radius Rf, and the radius Rf is a parameter for changing the size of the area F in FIG. However, the domain of the radius Ra is {Ra: 0 <Ra <Rf}, and the radius R
The domain of f is {Rf: Ra <Rf <R}. In addition,
The radius R is the tool radius. When the radii Ra and Rf exceed the range of each domain, it has an interactive form in which input is again made as an error. Step 580 is a step of changing the angle β1, and the angle β1 is a parameter for determining the size of the area B in FIG. Step 590 is a step for changing the angle β2, and the angle β2 is a parameter for determining the size of the area D in FIG. However, the domain of the angle β1 is {β1: 0 <β1 <90 °}, and the domain of the angle β2 is {β2: 0 <β2 <20 ° -2 × β1}.
When the angles β1 and β2 exceed the range of each domain, there is an interactive form for prompting another input as an error. Step 600 is a step for deciding whether to finish changing the parameters, and when continuation is selected interactively, step 560
And the process is repeated. When you select the end step 6
Execute Step 10. Step 610 is a step of outputting the changed contact point distribution map information MAP1 or MAP2.

Next, the graph changing means 230 will be described. The graph changing unit 230 is the feed rate determining unit 1
The graph for determining the feed rate at 60 is changed. The graph changing means 230 can interactively change the graph for determining the feed rate. The changed graph information GRP is sent to the feed speed determination means 160. The graph is used by the feed rate determination means 160 to determine the feed rate.

An example of the operation of such a configuration will be described with reference to FIGS. 14 and 15. FIG. 14 is a flow chart for explaining the operation of the graph changing means 230, and FIG. 15 is a view for explaining the parameters for changing the graph. In FIG. 14, step 620 is a step of changing the horizontal axis division number N, and the horizontal axis division number N is shown in FIG.
Represents the number of divisions of the domain of the horizontal axis distance r. In this example, the horizontal axis division number N is N = 4. Step 630 is a step of changing the range Hn on the vertical axis for each of the divided domains on the horizontal axis. The range Hn on the vertical axis is H0, H in FIG.
It corresponds to 1, H2 and H3. Step 64
0 is a step of determining whether to end the parameter change, and when continuation is selected as the interactive mode, the process returns to step 620 and repeats the processing. When end is selected Step 650
To execute. Step 650 is the changed graph information GR
This is the step of outputting as P.

[0062]

As described above, according to the present invention, machining shape data representing a machining shape, machining condition data representing machining conditions for machining the machining shape, and machining shape data and machining condition data Based on the contact point determining means for determining the degree of change in the gradient of the curved surface group forming the machining shape, and a pick width determining means for determining the pick width of the tool path based on the determination result of the contact point determining means. Therefore, there is an effect that it is possible to obtain a machining program for machining with a specified surface accuracy even if the machining shape is a complicated shape.

Further, there is an effect that a specified surface accuracy can be obtained without setting the pick width small in accordance with a steep surface and a processing program can be obtained in which the processing time is significantly shortened.

Further, even if the machining shape has a complicated shape, it is possible to obtain a machining program for machining in one machining step without dividing the machining step into a plurality of steps.

Further, there is an effect that the degree of change in the gradient of the machining shape can be easily calculated without complicated calculation, and the machining program creation time can be greatly shortened.

According to another aspect of the present invention, the machining shape data representing the machining shape, the machining condition data representing the machining conditions for machining the machining shape, and the machining shape data and the machining condition data are included. Based on the contact point determining means for determining the degree of change in the gradient of the curved surface group forming the machining shape, and the feed rate determining means for determining the machining feed rate of the tool path based on the determination result of the contact point determining means. Since it is equipped, the machining feed rate of the tool can be changed according to the cutting amount of the tool, the load of the tool can be reduced, the life of the tool can be extended, and the deterioration of the surface accuracy can be prevented. There is an effect that can be done.

Further, the operator does not have to reduce the feed rate on the basis of the place where the cutting load is large, and as a result, there is an effect that a machining program with a significantly shortened machining time can be created.

According to another invention of the present invention, the feed rate determining means has a graph as the comparing means, and determines the machining feed rate of the tool path based on the graph, and the graph is a graph. Since it is changed by the changing means, the graph that determines the feed rate can be changed, the feed rate can be determined according to the type of tool and the workpiece, and the optimum machining program can be created. There is.

According to another aspect of the present invention, based on the machining shape data representing the machining shape, the machining condition data representing the machining conditions for machining the machining shape, and the machining shape data and the machining condition data, Contact point determining means for determining the degree of change in the gradient of the curved surface group forming the machining shape, and a cutting direction determining means for determining upcut and downcut of the tool path based on the determination result of the contact point determining means, Based on the determination result of the cutting direction determination means, the cutting path display means for displaying the distinction between upcut and downcut on the trajectory of the tool path is provided. Can be easily confirmed on a display screen such as a CRT.

According to another invention of the present invention, based on the machining shape data representing the machining shape, the machining condition data representing the machining conditions for machining the machining shape, and the machining shape data and the machining condition data, Contact point determining means for determining the degree of change in the gradient of the curved surface group forming the machining shape, vertical wall determining means for determining the vertical wall portion of the tool path based on the determination result of the contact point determining means, and the vertical wall determining means. Since the vertical wall display means for displaying the distinction of the vertical wall portions on the trajectory of the tool path based on the determination result of the wall determination means is provided, it is easy to machine the vertical wall portion where the load of the tool becomes extremely large. It can be found, and the workload of the operator can be significantly reduced.

According to another aspect of the present invention, based on the machining shape data representing the machining shape, the machining condition data representing the machining conditions for machining the machining shape, and the machining shape data and the machining condition data, A tool path data creating unit that calculates a tool center point group and a contact point group and creates tool path data, and the above machining based on the tool center point group and contact point group of one line created by the tool path data creating unit Since the contact point determination means for determining the degree of change in the gradient of the curved surface group forming the shape is provided, the processing can be performed for each line of the tool path, and the time required for creating the machining program can be further shortened. There is.

According to another aspect of the present invention, the contact point determination means has a contact point distribution chart as a comparison means, and the gradient of the curved surface group forming the machined shape is changed based on this contact point distribution chart. The contact point distribution map is changed by the contact point distribution map changing means, so the contact point distribution map can be changed, and it is suitable for many types of tools. There is an effect that a different machining program can be created.

[Brief description of drawings]

FIG. 1 is a block diagram showing a machining program creating device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a contact point distribution diagram according to the embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the contact point determination means according to the embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the pick width determining means according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of a feed speed determination graph according to the embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the feed speed determination means according to the embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the cutting direction determination means according to the embodiment of the present invention.

FIG. 8 is a flowchart showing an operation of the cutting direction display means according to the embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the vertical wall determining means according to the embodiment of the present invention.

FIG. 10 is a flowchart showing an operation of the vertical wall display means according to the embodiment of the present invention.

FIG. 11 is a flowchart showing the operation of the contact point group determination means according to the embodiment of the present invention.

FIG. 12 is a flowchart showing the operation of the contact point distribution map changing means according to the embodiment of the present invention.

FIG. 13 is an explanatory diagram of parameters of the contact point distribution diagram according to the embodiment of the present invention.

FIG. 14 is a flowchart showing the operation of the graph changing means according to the embodiment of the present invention.

FIG. 15 is an explanatory diagram of parameters of the feed speed determination graph according to the embodiment of the present invention.

FIG. 16 is a diagram showing an example of a tool path locus according to the embodiment of the present invention.

FIG. 17 is a configuration diagram showing a conventional machining program creation device.

FIG. 18 is a block diagram showing a conventional machining program creation device.

FIG. 19 is a diagram showing a tool path locus of a sloped surface portion created by a conventional machining program creation device.

FIG. 20 is a diagram showing a tool path locus of a vertical wall portion created by a conventional machining program creation device.

FIG. 21 is an explanatory diagram of up-down and down-cut.

[Explanation of symbols]

100 machining shape data / machining condition data input means 110 tool path data creation means 120 numerical control data conversion means 130 tool path data display means 140 contact point determination means 150 pick width determination means 160 feed speed determination means 170 cutting direction determination means 20 cutting Direction display means 190 Vertical wall determination means 200 Vertical wall display means 210 Contact point group determination means 220 Contact point distribution map changing means 230 Graph changing means md Machining shape data td Tool data pk Pick width pk 'New pick width dr Machining direction cv Feed rate cv 'New feed rate h Surface accuracy cp Contact point cpn Contact point group tp Tool center point tp' New tool center point tpn Tool center point group tpn 'New tool center point group ud Cutting method Judgment result vt Vertical wall judgment result r XY plane projection distance between contact point and tool center point MAP1 Contact point distribution map information for contact point judgment means MAP2 Contact point group contact point distribution map information for judgment means JD1 Contact point judgment means judgment result JD2 Judgment result by contact point group judgment means GRP Graph information for determining feed rate

Claims (7)

[Claims] 1. A machining shape data representing a machining shape, machining condition data representing a machining condition for machining the machining shape, and a curved surface group forming the machining shape based on the machining shape data and the machining condition data. Based on the contact point determination means for determining the degree of change of the gradient of the contact point determination means,
A machining program creating device, comprising: a pick width determining means for determining a pick width of a tool path. 2. A machining shape data representing a machining shape, machining condition data representing a machining condition for machining the machining shape, and a curved surface group forming the machining shape based on the machining shape data and the machining condition data. Based on the contact point determination means for determining the degree of change of the gradient of the contact point determination means,
A machining program creation device, comprising: a feed speed determining unit that determines a machining feed speed of a tool path. 3. The feed rate determining means has a graph as a comparing means, and determines the machining feed rate of the tool path based on the graph, wherein the graph is changed by the graph changing means. The machining program creation device according to claim 2, which is characterized in that. 4. A machining shape data representing a machining shape, machining condition data representing a machining condition for machining the machining shape, and a curved surface group forming the machining shape based on the machining shape data and the machining condition data. Based on the contact point determination means for determining the degree of change of the gradient of the contact point determination means,
Cutting direction judging means for judging upcut and downcut of the tool path, and cutting direction display means for displaying upcut and downcut distinction on the trajectory of the tool path based on the judgment result of the cutting direction judging means. A machining program creation device characterized by comprising: 5. A machining shape data representing a machining shape, machining condition data representing a machining condition for machining the machining shape, and a curved surface group forming the machining shape based on the machining shape data and the machining condition data. Based on the contact point determination means for determining the degree of change of the gradient of the contact point determination means,
A vertical wall determination means for determining a vertical wall portion of the tool path, and a vertical wall display means for displaying a distinction of the vertical wall portion on the trajectory of the tool path based on the determination result of the vertical wall determination means. A machining program creation device characterized by. 6. A machining shape data representing a machining shape, machining condition data representing a machining condition for machining the machining shape, and a tool center point group and a contact point group based on the machining shape data and the machining condition data. Is calculated and tool path data is created, and the gradient of the curved surface group forming the machining shape based on the tool center point group and the contact point group of one line created by the tool path data creating unit. And a contact point determination means for determining the degree of change of the machining program. 7. The contact point determining means has a contact point distribution chart as a comparison means, and determines the degree of change in the gradient of a curved surface group forming the processed shape based on the contact point distribution chart, 7. The machining program creating device according to claim 1, wherein the contact point distribution map is changed by a contact point distribution map changing unit.