JPH11129141A - Automatic processing and evaluating device for machining information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically process and evaluate various pieces of machining information, and to automatically vary and set processed machining information when the evaluation does not satisfy a given condition. SOLUTION: This automatic processing and evaluating device for machining information comprises a processing portion deciding part 1 to draw a machining region from a product shape and a blank shape and decide a machining shape; a tool deciding part 2 having at least one of a tool selection part 21 to select a tool to machine in a decided machining shape and a tool designing part 22 to design a tool; a machining condition deciding part 3 to produce a tool locus and decide a machining condition for a selected or designed tool; a machining time calculating part 4 to produce a tool locus and calculate a machining time from a decided machining condition and produced tool locus; and a feedback processing part 5 to automatically correct at least one of all pieces of machining information decided by the deciding parts 1, 2 and 3 and the machining time calculating part 4 so that a calculated machining time is adjusted to a target value, and effect feedback of the machining information to the machining time calculating part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing information automatic creation and evaluation apparatus, and more particularly, for example, a processing portion for processing a rough material into a product, a tool for processing the processing portion, a processing condition, and the like. Processing information is automatically created, and whether the created processing information satisfies a target value is automatically evaluated. If the processing information does not satisfy the target value, predetermined processing information is automatically changed and set to satisfy the target value. The present invention relates to an automatic information creation and evaluation device.

[0002]

2. Description of the Related Art In the case where processing information is created and evaluated, the following operations have been generally performed. That is, as shown in FIG. 10, the designer manually extracts a part that needs to be processed by comparing it with the product drawing and its rough material drawing, and can easily perform processing when the processing part is complicated. And the processing shape is determined for each processing method. Then, a tool suitable for the determined machining shape is searched and selected from a list of tools currently held or the like.
If the tool suitable for the machining shape is not in the list of tools, etc., a new tool is designed from the machining shape, a machining instruction diagram for producing the tool is created, and the contents of the machining instruction diagram are confirmed. To create a tool drawing. Thereafter, the processing conditions such as the processing speed V and the tool feed speed f are calculated by confirming the material of the workpiece and the tool, the dimensions of the tool with respect to the processing shape, and the like. Next, the tool feed distance is calculated from the machining shape and the tool shape, and the tool trajectory is determined by determining the rapid traverse of the tool and the machining feed section according to the machining shape.
Subsequently, the machining time is calculated from the distances and speeds of the tool rapid traverse and machining feed sections, tool exchange time, tool drive spindle rise time, work posture conversion time, and the like. These series of operations are performed manually. The calculated machining time is compared with a preset target machining time.If the target machining time does not meet the target machining time, various conditions such as machining conditions and various shapes are changed and set so that the calculated machining time satisfies the target value. Then, the machining time is calculated again and compared with the target machining time each time.

On the other hand, as disclosed in Japanese Patent Application Laid-Open No. 2-109657, in an automatic tool selection method in a machining program creation process of an interactive numerical control device or an interactive automatic program creation device, an input machining shape is input. Automatically selects the tool with the shortest machining time by reading out the tool from the tool file corresponding to, reading the cutting conditions from the input coarse material data and the cutting condition file of the tool, calculating the machining time for each tool The scheme is conventionally known. This is, depending on the input of the processing shape,
The tool in the tool file is determined, the machining time of each tool is calculated by a numerical controller or the like according to the cutting conditions of the tool, and the tool with the optimal machining time is selected. According to this, the tool of the tool file corresponding to the machining shape is automatically selected, so that the operation of selecting the tool is simplified, and the creation of the machining program is shortened. ing.

Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 1-180009, an interactive image is displayed on a display device in accordance with each of a plurality of data input steps.
A programming device for inputting data specifying a material shape, a part shape including grooves, a machining process, a tool to be used, etc. with reference to the interactive image, and creating an NC program for turning using the input data. In the first method, the tool is fed in a predetermined amount in the direction of the center of the material to cut the groove, and then the material is fed in the longitudinal direction of the material by an amount corresponding to the groove width. After processing, prepare a second processing method for pulling up the tool and grooving. The tool data of the tool used for grooving is prepared by repeating the first processing method and grooving to the groove depth. Including the identification data for determining whether to perform the groove processing to the entire groove width by repeating the second processing method, and when the tool to be used is determined, based on the identification data included in the tool data of the tool to be used. Determine the groove processing method and determine Create a tool path for grooving based on the processing method, an automatic programming system for creating NC data for grooving for grooving along the tool passage, are conventionally known. This creates a tool path for grooving based on the determined machining method,
NC data for moving a tool along the tool path is created. According to this document, it is described that a tool path capable of shortening the groove processing time can be automatically determined depending on a tool to be used, and is particularly effective when the groove is wide and deep.

Further, a data processing apparatus disclosed in Japanese Patent Application Laid-Open No. 61-95851 and Japanese Patent Application Laid-Open No. 6-3325 are disclosed.
No. 15, a processing data creation system disclosed in
An optimal cutting path generation method in automatic programming disclosed in Japanese Patent Application Laid-Open No. 62-176730 is known.

[0006]

However, in the technique shown in FIG. 10 as a technique which has been conventionally and generally performed, a series of operations for creating and evaluating a series of processing information is performed manually. There are various problems, such as enormous labor and time. For example, in extracting a processing part, it is necessary to manually compare drawings and extract a part that requires processing. Further, when selecting a tool, it is necessary to search for and select a tool suitable for the machining shape from a tool list or the like. Furthermore, when there is no tool suitable for the machining shape in the tool list, etc., and when designing a new tool, it is necessary to manually create a tool diagram by comparing the product drawing and coarse material drawing, In addition, there is a problem that it is not possible to proceed to the operation after calculation of the next machining condition until the creation of the tool drawing or the like is completed. Furthermore, when calculating the processing conditions, the processing diameter of the tool must be confirmed. Also, to create a tool path,
The feed distance of the tool must be changed each time according to the tool shape and the processing shape. Further, until the determination of the tool and the creation of the tool trajectory are completed, it is not possible to grasp the required number of facilities and the like. In addition to these problems, depending on the weight of the tool, the load of the tool changer differs, and if a heavy tool is moved at a constant speed and comes into contact with Therefore, it is necessary to consider the difference due to the weight of the tool in the tool change time when calculating the machining time. Further, when the calculated processing time does not satisfy the target processing time, the processing conditions and the processing shape are manually changed, and the processing after setting these changes is manually performed again. It must be repeatedly evaluated and compared with time. The work for that takes a lot of trouble and time, and the calculated machining time changes and sets various conditions so as to satisfy the target machining time and feeds back.
There is also a problem that it takes a long time to grasp the influence of various conditions, resulting in great difficulty.

On the other hand, in the automatic tool selection method disclosed in Japanese Patent Application Laid-Open No. 2-109657, since the machining time is calculated using only the data stored in the tool file and the cutting condition file, complicated conditions are required. There is a problem that it is difficult to calculate the processing time below. In addition, there is a problem that a tool corresponding to a machining shape is only automatically selected from a tool file, and if a tool corresponding to a machining shape is not present in a tool file, the tool cannot be dealt with. Furthermore, in this apparatus, it is only necessary to calculate the machining time of the tool in the tool file corresponding to the machining shape and select the tool having the shortest machining time, and evaluate whether the calculated machining time satisfies the target machining time. Also, no consideration is given to changing and setting various processing conditions and feeding back when the calculated processing time does not satisfy the target processing time.

In the automatic programming system disclosed in Japanese Patent Application Laid-Open No. 1-180009, an NC program for processing a part including a wide deep hole groove is used. Only the first or second grooving method is determined by the tool, and the tool path (tool trajectory) is simply created based on this method. Therefore, not only about calculating the processing time and comparing the calculated processing time with the target processing time, but also changing and setting various processing conditions and feeding back when the calculated processing time does not satisfy the target processing time. Not at all. Then, the grooving method is determined based on the determined used tool, the tool path is created, and the NC data for grooving is created. Therefore, in order to change the grooving method and the tool path, the tool itself needs to be grooved. It must be changed to a different processing method. For this reason, it is difficult to change and set various conditions so that the calculated processing time satisfies the target processing time and feed it back.

Furthermore, in the apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 61-95851, a machining condition command is calculated such that the cutting efficiency is optimized as the machining progresses, and changes in the machining status are calculated. This is to perform the following processing. Further, in the method disclosed in Japanese Patent Application Laid-Open No. Hei 6-332515, when processing a corner portion, a first tool having a maximum diameter that can be inserted into the corner portion is first selected, and machining with the tool is performed. The remaining cutting portion of the region is calculated, and the remaining cutting portion is cut by the second tool, thereby shortening the processing time. Japanese Patent Application Laid-Open No. Sho 62-176730 discloses a technique in which a cutting amount is automatically adjusted, and an efficient cutting path is automatically generated. Therefore, these Japanese Patent Application Laid-Open Nos. 61-95851.
JP, JP-A-6-332515 and JP-A-6-325515
In what is disclosed in 2-176730 gazette,
As a result, it is not considered that the calculated machining time satisfies the target machining time, or that the machining conditions such as the feed once determined so as to satisfy the target machining time are set and fed back are changed. there were.

[0010] Japanese Patent Application Laid-Open No. 2-109657,
JP-A-1-180009, JP-A-61-9585
No. 1, JP-A-6-332515 and JP-A-62-176730, processing information is automatically created comprehensively, and the created processing information is set to a target value. There is no automatic evaluation of whether or not the predetermined processing information is automatically changed so as to satisfy the target value when the target value is not satisfied. Furthermore, none of the above-mentioned conventional technologies has a technical idea of automatically designing the tool when there is no tool corresponding to the processing shape, and therefore, the subsequent processing conditions There was a problem that it was not possible to proceed to the examination of the creation of such.

The present invention has been made in view of the above problems, and has as its object to automatically create various types of processing information, automatically evaluate the created processing information, and, when the evaluation does not satisfy a predetermined condition, An object of the present invention is to provide a processing information automatic creation and evaluation device capable of automatically changing and setting processing information created so that an evaluation satisfies a predetermined condition.

[0012]

In order to achieve the above object, a processing information automatic creation evaluation apparatus according to the present invention extracts a processing part from a product shape and a coarse material shape and determines a processing part. Part, a tool determination part having at least one of a tool selection part for selecting a tool and a tool design part for designing a tool for processing to a determined processing shape, and processing of the selected or designed tool A processing condition determining unit that determines a condition, a processing time calculation unit that generates a tool path, and calculates a processing time from the determined processing condition and the generated tool path, and a calculated processing time that satisfies a target value And a feedback processing unit that automatically corrects at least one of the pieces of processing information determined by each of the determination units and the processing time calculation unit and feeds back the information to the corresponding determination unit or the processing time calculation unit. And it is characterized in and.

In the processing condition examination apparatus according to the present invention, the processing part is automatically extracted by the processing part determining unit, and the processing shape is determined. The tool for processing into the determined processing shape is automatically designed by the tool design unit of the tool determination unit,
Alternatively, if a tool to be machined into the machining shape is among the currently held tools, the tool is automatically selected by the tool selection unit, and a tool suitable for the machining shape is selected from the currently held tools. If not, the tool is automatically designed by the tool design unit. The processing condition determination unit automatically determines the processing conditions of the selected or designed tool, and the processing time calculation unit automatically calculates the processing time from the determined processing conditions and the created tool trajectory. Then, it is determined whether the calculated processing time satisfies a preset target processing time, and if the target processing time is not satisfied, the feedback processing unit determines the processing conditions determined by each determination unit and the processing time calculation unit, At least one of the processing information of the tool, the processing shape, the equipment, etc. is automatically corrected and fed back to the corresponding determination unit or the processing time calculation unit, and the processing time is calculated again and evaluated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of a processing information automatic creation and evaluation apparatus according to the present invention will be described in detail with reference to FIGS. The same reference numerals in the drawings denote the same or corresponding parts. The reference numerals of the respective steps shown in FIGS. 2, 3 and 6 correspond to the respective steps of the flowchart of FIG. 9 showing the control when examining the machining conditions using the machining condition examination apparatus of the present invention. ing.

As shown in FIG. 1, a processing information automatic creation and evaluation apparatus according to the present invention generally includes a processing part determining unit 1 that extracts a processing part from a product shape and a coarse material shape and determines a processing shape. A tool selecting unit 21 for selecting a tool and a tool designing unit 22 for designing a tool for machining into the determined machining shape
A tool deciding unit 2 having at least one of the following: a machining condition deciding unit 3 for deciding a machining condition of a selected or designed tool; a tool trajectory is created; the determined machining condition and the created tool trajectory are created And a processing time calculation unit 4 for calculating a processing time from at least the respective processing information determined by each of the determination units 1, 2, 3 and the processing time calculation unit 4 so that the calculated processing time satisfies the target value. A feedback processing unit 5 that automatically corrects one and feeds it back to the corresponding determination units 1, 2, 3 or the processing time calculation unit 4 is provided.
The processing part determination unit 1, the tool determination unit 2, the processing condition automatic determination unit 3, and the processing time calculation unit 4 are independently connected to the feedback processing unit 5, respectively. The input device 7, the display 8, and output devices such as the printer 9 are connected to each other.

The machining part determining unit 1 includes a machining part extracting unit 11
And a machining shape determining unit 12 for accessing a product shape CAD data file 13 and a coarse material shape CAD data file 14 stored as required by three-dimensional CAD, and storing information stored therein. It is possible to read. Product shape CAD data file 1
3 stores product dimensions and their tolerances. The coarse material shape CAD data file 14 stores the size and material of the coarse material.

The machining part extraction unit 11 accesses the product shape CAD data file 13 and the coarse material shape CAD data file 14, reads and analyzes the final product shape and the rough material shape before machining, respectively, and A processing part for processing a desired product shape from the shape is extracted. Since the product shape CAD data file 13 and the coarse material shape CAD data file 14 are stored in three-dimensional CAD, for example, holes or surfaces such as those shown in S2 in FIGS. Extraction of the processing part can be performed automatically.

The machining shape determining unit 12 includes a machining site extracting unit 1
From the processing portion extracted in step 1, the parameters of the processing shape such as the processing shape and the diameter D and the depth (length) L of each processing shape are determined. When the processing part extracted by the processing part extraction part 11 is not complicated, the processing part determined by the processing shape determination part 12 determines the processing part as the processing shape, for example, shown in S3 in FIG. like,
The holes which are the extracted processing parts are the small diameter part d1 and the large diameter part d2.
In the case of a complicated structure having a chamfered portion C and a small-diameter portion d1, the chamfered portion C is machined with one tool, and the large-diameter portion d2 is machined with another tool. It is determined as a divided processing shape. When dividing a processing part into each processing shape, it is set so that processing parts whose processing accuracy is closely related to each other may be combined. In the example shown in FIG. 2, the small-diameter portion d1 and the large-diameter portion d2 require the small-diameter portion d1 and the chamfered portion C when the concentricity between the chamfered portion C and the central axis with higher precision is required. It is a combined processing shape.

The tool deciding section 2 includes a tool selecting section 21 and a tool designing section 22. The tool deciding section 2 accesses a tool database 23 as needed to read tool data stored therein. It is possible. The tool data stored in the tool database 23 includes, as a specific example, as shown in FIG.
It includes the assigned number, type, the size of the tool such as the length L and diameter D that can be processed, the number of cutting tools, the number of holes and the like that can be processed at one time, and the like.

The tool selection unit 21 includes a tool database 23
To access the current tool data
For example, when the processing shape determined by the processing shape determination unit 12 is a hole, a drill capable of drilling is used. When the processing shape is a surface, a milling tool that can perform plane cutting is used. Select the type of tool. Then, from the parameters of the processing shape, such as the processing diameter, the processing depth, the chamfer angle, the width of the processing surface, and the like of the processing shape determined by the processing shape determination unit 12, the tool shape parameters to which the diameter D and the length L fit are obtained. Automatically select the tools to have and assign them to each. It is possible to automatically select a tool according to the parameters of the processing shape.

On the other hand, when there is no tool having a tool shape parameter suitable for the machining shape in the currently held tool data stored in the tool database 23, each machining determined by the machining shape determining unit 12 is performed. From the machining parameters such as the diameter D and the depth (length) L of the shape, the tool design unit 22
Calculates the outer diameter D and the length L of the tool, and automatically designs a tool having tool shape parameters suitable for processing into the processed shape. It is possible to automatically design the tool shape by the parameters of the processing shape. When the machining portion is divided into machining shapes that are easy to machine as described above, a tool having a tool shape parameter corresponding to the machining shape parameter is assigned by the tool selection unit 21 or the tool design unit 22. The design drawing and the like created by the tool automatic design unit 22 are stored as new tool data in the tool database 23, and are displayed on the display 8 or printed out by the printer 9 as necessary.

The processing condition determining unit 3 can access the processing condition database 31 as needed to read the processing condition data such as cutting stored therein. The machining condition data stored in the machining condition database 31 includes, as shown in FIG. 5 as a specific example, machining conditions in which various combinations of the material of the tool and the material of the coarse material are set, and the respective machining conditions. , The processing speed V and the feed speed f, and the maximum processing speed Vm and the feed speed fm are included. The processing condition determination unit 3 automatically determines the processing speed V of the tool and automatically calculates and determines the feed speed F of the tool as the processing condition of the tool. The determination of the processing conditions by the processing condition determination unit 3 is automatically performed because it is performed based on the material of the work material, the material and tool shape parameters of the tool selected or designed by the tool determination unit 2, and the like. It becomes possible.

The machining speed V of the tool by the machining condition determining unit 3
Is determined and the feed speed F is calculated as follows. That is, first, the length L and the diameter D of the tool are read from the tool database 23, and the ratio of the processing diameter to the length of the tool (L / D) is obtained. And, for example, L / D <
4, the recommended processing speed V and the recommended feed speed f are selected from the processing conditions as shown in FIG.
When it is not <4, a recommended processing speed, a recommended feed speed, a maximum acceleration, a feed speed, and the like under other processing conditions different from the processing conditions of FIG. 5 are selected. If the length of the tool is long relative to its diameter (L / D is large), it is not possible to increase the machining speed or the feed speed. Further, the acceleration and the feed speed are set to the maximum acceleration Vm and the feed speed fm.
Cycle time is shortened by approaching
Since the tool life is shortened, the frequency of tool replacement is increased, which causes an increase in machining time described later. Here, the processing speed means the speed of the relative movement between the work material (coarse material) and the tool, and in the case of a rotary tool, is represented by the following equation. Machining speed V = (pi π × tool diameter D × machining speed N) / 1000 (unit: m / min) Therefore, the machining speed N is expressed by the following equation (FIG. 3). S7). Machining rotation speed N = (1000 × machining speed V) / (pi π × tool diameter D)... Then, the machining condition determining unit 3 calculates the feed speed F into the following formula based on the above formula. Therefore, it is automatically calculated. Feed rate F = Recommended feed rate f x Number of cutting tools z x Number of processing revolutions N ...

As shown in S8 of FIG. 3, for example, the processing shape is a multi-step hole having a small-diameter portion d3 and a large-diameter portion d4. The conditions are the condition No. when processing the small diameter portion d3. T1
The recommended machining speed of FIG. 5 is determined to be V1, and the feed speed F is calculated based on the recommended tool feed speed f1. When processing the large diameter portion d4, the condition No. The recommended machining speed at T2 (FIG. 5) is determined to be V2, and the feed speed F is calculated based on the recommended tool feed speed f2. And the tool is large diameter part d4
When the machining is started, that is, when shifting from the machining speed V1 and the feed speed f1 to the machining speed V2 and the feed speed f2, for example, the machining speed is automatically changed to V2 and the feed speed f3 is changed to the feed speed. One end is changed to half of f2 (feed speed change).

The machining time calculator 4 includes a tool path generator 41
And a machining time calculation unit 42. The equipment database 43 can be accessed as needed to read equipment data stored therein. The equipment data stored in the equipment database 43 includes information on the shape of each equipment for driving various tools selected or designed by the tool determination unit 2, the frequency of equipment stoppage for maintenance, and , Equipment number, equipment performance data, and the like in the production line.

The tool trajectory creating section 41 includes a tool feed movement trajectory for each machining shape, an approaching retreat movement trajectory for each tool machining shape, and a movement trajectory between each machining portion (for example, from one hole machining to the next). Locus for drilling holes)
And create Since the creation of the tool trajectory is performed based on the parameters of the machining shape and the tool shape parameters, it is possible to automatically calculate the start point and the end point of the machining feed such as cutting of the tool so that no machining remains. Further, the tool trajectory creating unit 41 selects and designates equipment for driving the tool from the equipment stored in the equipment database 43 based on the created movement trajectory of the tool.

The processing time calculation section 42 is provided with a processing condition determination section 3
Feed speed determined by (Change of feed speed described above)
), And the machining time is automatically calculated from the machining trajectory distance created by the tool trajectory creating unit 41 and the like. The calculation of the machining time includes, in addition to the actual machining time of the workpiece by the tool, the time for the approaching and retreating movement of the tool with respect to each machining shape, and the main shaft of the equipment for driving the tool is rotated at a predetermined rotational speed N. , The time required for acceleration and deceleration until the tool reaches, and the time required for tool replacement based on the life. The time for the tool change is generally set in advance by equipment for mounting the tool (for example, t4). However, in the machining condition examination apparatus of the present invention, the change set in advance is determined by the weight w of the tool. It is configured to change from the time (t4) to another preset replacement time (for example, t5). That is, the tool weight w is compared with a preset tool weight wm, and when the estimated tool weight w is smaller than the set tool weight wm, the tool change time is set in advance. When the estimated tool weight w is equal to or larger than the set tool weight wm at t4, the tool change time is set at t5 set in advance. The tool weight w is stored in the tool database 23 or the three-dimensional C of the tool designed by the tool automatic design unit.
It can be automatically calculated and estimated from the tool volume that can be calculated by AD and the specific gravity uniquely determined from the tool material stored in the processing condition database 31. Therefore, it is possible to automatically calculate the time according to the actual situation for tool change.

The feedback processing unit 5 evaluates the processing time t calculated by the processing time calculation unit 4 by comparing the processing time t with a preset target processing time, and the calculated processing time t determines the target processing time. If not, the machining shape determined by the machining site determining unit 1, the tool determined by the tool determining unit 2, the machining condition determined by the machining condition automatic determining unit 3, and the machining time determined by the machining time calculating unit 4. Automatically corrects at least one of the equipment for driving the tool, and feeds it back to the predetermined determining units 1, 2, 3, and 4 to calculate the machining time again. The processing time calculated by the processing time calculation unit 4 and the target processing time preset in the feedback processing unit are displayed on the display 8 or printed out by the printer 9 as necessary.

Next, a series of controls for creating processing information by the processing information automatic creation and evaluation apparatus of the present invention configured as described above and evaluating the processing information will be described in detail. First, the basic control will be described with reference to the flowchart shown in FIG. When the study of the processing conditions is started (S
1) The processing part extraction unit 11 accesses the product shape CAD data file 13 and the rough material shape CAD data file 14 to read the final product shape and the rough material shape before processing, respectively, and reads out the rough material shape. A part to be processed into a desired product shape is extracted (S2), and the processed shape determining unit 12 determines a processed shape from the processed part (S3).

Thereafter, the tool determining section 2 accesses the tool database 23 to determine whether a tool corresponding to the determined machining shape is included in the tool data (S4), and if there is a tool corresponding to the machining shape. In the case of (YES), the tool is automatically selected from the tool data by the tool automatic selection unit 21 (S5), and when there is no corresponding tool (in the case of NO)
The tool according to the machining shape is designed by the tool automatic design part 22 (S6).

Subsequently, the processing condition automatic determination unit 3 determines the processing conditions such as the processing rotational speed N and the feed speed F by automatically calculating according to the above formulas and the formulas (S
7) The tool trajectory creating unit 41 creates a tool trajectory such as a start point and an end point of the machining feed of the tool for each machining shape (S8), and accesses the equipment database 43 to specify the equipment to be used. (S9). Then, the machining time calculation unit 42 determines the determined machining speed V and feed speed F (machining conditions) of the tool, the distance of the created moving path of the tool,
Then, the machining time is calculated from the replacement time based on the weight of the tool and the like (S10), and the calculated machining time is compared with a preset machining time to determine whether the set time is satisfied (S11). If the calculated processing time satisfies the set processing time (in the case of YES), the contents determined by the determination units 1, 2, 3, and 4 are displayed on the display 9 as necessary.
Or print out by the printer 10 to end the examination of the processing conditions (S12).

If the calculated machining time does not satisfy the set machining time (NO in S11), it is first determined that the equipment to be used is changed (YES in S13). In this case,
Returning to step 9, the equipment database 43 is accessed, another equipment having a different performance or the like from the previously specified equipment is selected and specified again (S9).
The processing time is calculated again (S10), and it is determined whether the preset processing time is satisfied (S11). If the processing time is satisfied, the creation of the processing information and the evaluation thereof are terminated (S1).
2).

If the calculated processing time does not satisfy the set processing time (NO in S11), then it is determined whether the calculated processing time satisfies the set processing time by changing the processing conditions. That is, it is determined that the used equipment is not changed (S
It is determined that the processing conditions are changed (NO in S13) (S14).
YES). Then, returning to step 7, the processing condition setting unit 3 changes the setting of the processing condition. At this time, in order to shorten the machining time, the machining speed V of the tool or the feed speed f of the tool is set to be increased. However, as shown in FIG. Vm
And the maximum feed speed fm are set, and the processing conditions are changed within the range of these speeds. In this case, since the tool life is shortened and the frequency of replacement is increased, an increase in tool replacement time is considered. Subsequently, the processing after step 8 is performed again, and it is determined whether the processing time calculated again by the processing time calculation unit 42 (S10) satisfies a preset processing time (S11). The creation of the information ends (S12).

If the calculated processing time does not satisfy the set processing time, it is next determined whether the calculated processing time satisfies the set processing time by changing the processing shape. That is, it is determined that the equipment to be used is not changed (NO in S13), it is determined that the processing conditions are not changed (NO in S14), the processing shape is changed (S15), and the hole that can be processed from the time to be shortened is determined. The depth and length of the surface are calculated, and the process returns to step 3 to determine a processing shape different from the processing shape previously determined by the processing portion determination unit 1 so that the calculated hole depth and length of the surface become the calculated hole depth and surface length. I do. Then, the processing after step 4 is performed again, and it is determined whether the processing time calculated again by the processing time calculation unit 42 (S10) satisfies a preset processing time (S11). Here, the change in the processing shape means a change in both the product shape and the coarse material shape, and the product is processed so that the depth of the workable hole and the surface length calculated from the time to be shortened are obtained. It is also possible to change the coarse material shape without changing the shape, or change the product shape without changing the coarse material shape, or change both the rough material shape and the product shape.

In this embodiment, when the calculated machining time does not satisfy the set machining time, the equipment used, the machining conditions, and the machining shape are changed one by one. The processing information automatic creation evaluation device is not limited to this, and as described above, a tool for processing into the determined processing shape may be changed to one having a different performance, etc. It is also possible to change the combination of the processing conditions, the processing shape and the tool.

Next, referring to the above-mentioned flowchart, a case where the hole is drilled will be described with reference to FIGS. From the product shape CAD data file 13 and the coarse material CAD data file 14 stored as three-dimensional CAD information, the processing part extraction unit 11 reads and analyzes the final product shape and the coarse material shape before processing, respectively. Then, a hole which is a processing part is extracted (S2).

From the extracted machining parts, the machining shape and parameters of the machining shape of the three-dimensional CAD such as the diameter D and the depth (length) L of each machining shape are determined by the machining shape determination unit 12. Is selected and specified from the tools stored in the tool database 23 (S
5). On the other hand, if there is no suitable tool among the tools stored in the tool database 23, a three-dimensional tool shape is automatically designed based on the parameters of the machining shape determined by the three-dimensional CAD (S6).

Next, machining conditions are automatically calculated based on the tool shape parameters of the selected or designed tool (S
7). As described above, the calculation of the processing conditions is based on the ratio (L / D) of the processing diameter to the length of the tool determined first.
Select the appropriate processing condition data stored in the processing condition database 31 (see FIG. 5), and read the recommended processing speed V and the recommended feed speed f from the processing condition data.
The processing speed N is obtained from the equation, and the feed rate F is automatically calculated according to the equation.

As shown in S8 of FIG. 3, when the machining shape is determined to be a multi-step hole, the condition No. of FIG.
While the machining of the small-diameter portion d3 for which the recommended machining speed of T1 = V1 and the recommended tool feed speed f1 is continued, the end face of the large-diameter portion of the tool comes into contact with the workpiece, and the condition No. Recommended machining speed of T2 = V2, large-diameter portion d at which recommended tool feed speed f2 is selected
When the machining of No. 4 is started, that is, when shifting from the machining speed V1 and the feed speed f1 to the machining speed V2 and the feed speed f2, for example, the feed speed is set to a half of f1 to f2.
Automatically change to 3.

When a tool path is created by the tool path determination section 41 and the equipment to be used is specified from the equipment database, the machining time calculation section 42 automatically calculates the weight of the tool based on the tool material and the tool shape parameters. By calculating, the speed at which the tool can be replaced is automatically calculated, and the tool replacement time is obtained. Then, the machining time calculation unit 42 calculates the actual machining time and the movement time from the machining conditions and the tool trajectory, and calculates the machining time t by adding the spindle acceleration / deceleration time and the previously determined tool change time (S1).
0).

The calculated machining time t is compared with a preset target machining time. If the calculated machining time t is not included in the target machining time, the machining conditions are changed in the case of this hole machining. change. This change in processing conditions
The difference Δt between the target machining time and the calculated machining time t is calculated, and the machining speed and the feed speed of the tool calculated in step 7 are calculated as follows:
From the recommended processing speed V and the recommended feed speed f, the speed is increased at a predetermined ratio until reaching the maximum acceleration speed Vm and the maximum feed speed fm. As a result, Δt is reduced.

If the calculated processing time t does not fall within the target processing time even after changing the processing conditions, the processing shape is changed.
In order to change the machining shape, the depth (machining distance) of the hole is calculated from the difference Δt between the target machining time and the calculated machining time t and the feed rate F of the tool so that Δt is eliminated. Products with a shape that has
A shape of a coarse material that can be processed by drilling to that depth is proposed. Then, the calculation of the processing time is performed again in the case of these proposed products or the shape of the rough material.

Next, FIGS. 6 to 8 show the case of performing surface processing.
It will be described based on. In this description, only portions different from the above-described hole processing will be described, and description of the same or corresponding portions will be omitted. For example, if the work material has a machined surface as shown in FIG.
Product shape CAD data file 13 and coarse material shape CAD data file 1 stored as three-dimensional CAD information
4, the final product shape and the rough material shape before processing are read and analyzed, and the maximum length L and the maximum width W of the processing surface are extracted.
Are determined. Automatic tool selection unit 2
In step 1, a suitable tool is automatically selected from the three-dimensional machining shape parameters from the tools stored in the tool database 23 (S5). The milling cutter for surface machining as the tool M is generally set with an incident angle α and a relief angle β, and the incident angle α, the relief angle β, and the maximum width of the machining surface extracted by the machining site extracting unit 11. The diameter D of the milling cutter M is calculated based on a processing shape parameter such as W.

On the other hand, if there is no appropriate tool in the tool data of the tool database 23,
The tool automatic design part 22 automatically creates a three-dimensional tool shape using the parameters of the three-dimensional CAD machining shape determined by (3) (S6). The tool automatic design unit 22 determines the diameter D of the milling cutter M calculated from the maximum length L and the maximum width W of the machined surface, and automatically designs the tool shape. The number Z of the cutting tools of the milling cutter M depends on the work material such as aluminum or cast iron, but is obtained by the following equation. z = (pi π × tool diameter D) / C (where C is the material coefficient of the work material)

In the tool trajectory creating section 41, the machining time calculating section 42 automatically calculates the weight of the tool based on the tool material and the tool shape parameters, and automatically calculates the speed at which the tool can be replaced. Ask for time. The processing (cutting) distance is automatically calculated according to the type of equipment. That is, for example, as shown in FIG. 7, when the equipment type is a dedicated machine that performs a so-called healing in which the main shaft Mc that rotationally drives the milling cutter M is inclined with respect to the processing surface of the work material, the cutting edge of the milling cutter M is The distance L from the point at which contact with the workpiece is started (one-point contact) to the point at which the milling cutter M separates from the workpiece and ends machining (three-point contact) is automatically calculated. Also, as shown in FIG. 8, when the spindle type Mc for rotating and driving the front milling cutter M is an NC processing machine that is perpendicular to the processing surface of the workpiece, the cutting edge of the milling cutter M is applied to the workpiece. The distance L from the point at which contact starts (single point contact) to the point at which the cutting edge of the milling cutter M separates from the workpiece and ends machining (single point contact) is automatically calculated. As a result, a tool path is created in step 8, and a machining time t is calculated (S10).

[0046]

According to the processing information automatic creation and evaluation apparatus according to the present invention, a processing part determining unit for extracting a processing part from a product shape and a coarse material shape and determining a processing shape, For processing, a tool selection unit having at least one of a tool selection unit that selects a tool and a tool design unit that designs a tool, and a processing condition determination unit that determines the processing conditions of the selected or designed tool , Create a tool path,
A processing time calculation unit that calculates a processing time from the determined processing conditions and the created tool trajectory; and a processing time calculation unit that is determined by each determination unit and the processing time calculation unit so that the calculated processing time satisfies the target value. A feedback processing unit that automatically corrects at least one of the processing information and feeds it back to the corresponding determination unit or the processing time calculation unit automatically creates various types of processing information automatically in a comprehensive manner. Is evaluated, and if the evaluation does not satisfy the predetermined conditions,
The processing information created so that the evaluation satisfies a predetermined condition can be automatically changed and set.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a processing information automatic creation evaluation apparatus according to the present invention.

FIG. 2 is an explanatory diagram illustrating an outline of a work performed by a processing information automatic creation evaluation apparatus according to the present invention.

FIG. 3 is an explanatory diagram showing a specific example in a case where processing information for hole drilling is created and evaluated by the processing information automatic creation evaluation apparatus according to the present invention.

FIG. 4 is a table showing a specific example of tool data stored in a tool database.

FIG. 5 is a table showing a specific example of processing condition data stored in a processing condition database.

FIG. 6 is an explanatory diagram showing a specific example in a case where processing information for surface processing is created by the processing information automatic creation evaluation apparatus according to the present invention.

FIG. 7 is an explanatory view showing a case where the equipment type shown in FIG. 6 is a dedicated machine for performing so-called healing in which a main shaft for driving and rotating a tool is inclined with respect to a work material.

FIG. 8 is an explanatory diagram showing a case where the equipment type shown in FIG. 6 is a face milling NC machine in which a main shaft for driving and rotating a tool is perpendicular to a work material.

FIG. 9 is a flowchart showing a series of basic controls for creating processing information by the processing information automatic creation and evaluation apparatus of the present invention and evaluating the processing information.

FIG. 10 is an explanatory diagram showing an outline of a conventional operation for creating general processing information and evaluating the same.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Processing part determination part 2 Tool determination part 21 Tool selection part 22 Tool design part 3 Processing condition determination part 4 Processing time calculation part 5 Feedback processing part

Claims (1)

[Claims] 1. A processing part determining unit for extracting a processing part from a product shape and a rough material shape and determining a processing shape, a tool selecting unit for selecting a tool for processing to the determined processing shape, and a tool A tool determination unit having at least one of a tool design unit for designing a tool, a machining condition determination unit for determining a machining condition of a selected or designed tool, and a tool path, and the determined machining condition and creation A machining time calculating unit that calculates a machining time from the tool trajectory obtained, and at least one of the machining information determined by each of the determining units and the machining time calculating unit so that the calculated machining time satisfies the target value. A machining information automatic creation / evaluation apparatus comprising: a feedback processing unit that automatically corrects and feeds back to a corresponding determination unit or a machining time calculation unit.