JP5830605B2 - Machine tool and processing method - Google Patents

Description

  The present invention relates to a machine tool, and more particularly, to an improved machine tool that conveys a workpiece by a workpiece conveyance mechanism and processes the workpiece by a machining head.

  A machine tool that performs machining on a workpiece by a machining head called a gang head is known, for example, as disclosed in Patent Literature.

  As disclosed in Patent Document 1, the machining unit includes six multi-axis machining heads, and moves in the horizontal direction so as to approach and separate from the clamp unit. The clamp unit is provided in the transport line. The clamp unit is transported in the horizontal direction perpendicular to the horizontal direction along the transport line. The clamp unit includes an advance / retreat arm, and a workpiece is clamped by these advance / retreat arms.

  In the structure of the processing apparatus disclosed in Patent Document 1, the processing unit, which is a heavy object, is moved in the contact / separation direction with respect to the transport line, so that energy consumed for the movement increases. Further, the clamp unit is transported by a transport line, stopped at a predetermined position, and machined by the processing unit at that position. However, the stop position of the clamp unit needs to be accurate. To be accurate, considerations such as lowering the transport speed and driving a knock pin at the stop position are required. As a result, the structure of the transport line becomes complicated and it is difficult to increase the transport speed.

  From the viewpoint of energy saving, it is desired that the processing unit be stationary, and from the viewpoint of improving productivity, the speed of the transfer line is required. That is, there is a need for a machine tool that does not need to move the processing unit and that can speed up the transfer line.

JP 2011-240466 A

  An object of the present invention is to provide a machine tool that does not need to move a processing unit and can increase the speed of a transfer line.

According to one aspect of the present invention according to claim 1, a machine tool that conveys a workpiece by a workpiece conveyance mechanism and performs machining on the workpiece by a stationary machining head, the workpiece being provided in the workpiece conveyance mechanism, A conveying jig that conveys from the insertion port or from the previous process to the lower part of the machining head, a receiving pin that is provided in the conveying jig and engages with an engagement hole of the workpiece, and provided on the machining head. A workpiece receiving plate that waits for the workpiece to arrive below, a positioning pin that is provided on the workpiece receiving plate and that engages with a positioning pin hole of the workpiece at a portion different from the engagement hole, and the processing head A workpiece receiving plate moving mechanism provided to move the workpiece receiving plate so as to approach the machining head while scooping up the workpiece; There is provided a machine tool comprising: a work restraining plate that is disposed between a work head and the work receiving plate and presses the work against the work receiving plate after the work has approached the working head to a predetermined position. The

  In the invention according to claim 2, preferably, a plurality of the machining heads are provided, and a plurality of the conveying jigs are provided according to the number of the machining heads, and the plurality of conveying jigs are mutually connected. Connected, the workpiece transfer mechanism transfers a plurality of the workpieces simultaneously.

In the invention according to claim 3, preferably, a plurality of the machining heads are provided, and a plurality of the workpiece receiving plates are provided according to the number of the machining heads, and the plurality of workpiece receiving plates are mutually connected. are integrated, to approach stacked on the workpiece receiving plate at one of the work receiving plate moving mechanism a plurality of said workpiece simultaneously with the machining head.

  In the invention according to claim 4, preferably, when the workpiece is transferred, the transfer jig is closer to the processing head than the workpiece receiving plate so that the transfer jig does not interfere with the workpiece receiving plate. Is arranged.

According to another aspect of the invention according to claim 5, the work is provided to a work transport mechanism that transports the work, and the work is transported from a work input port or below a stationary processing head that processes the work from the previous process. A conveying jig, a receiving pin that is provided in the conveying jig and engages with an engagement hole of the workpiece, a workpiece receiving plate that is provided in the machining head and waits for the workpiece to arrive below the machining head, and A positioning pin that is provided on the workpiece receiving plate and engages with a positioning pin hole of the workpiece at a part different from the engaging hole; and the processing head provided on the processing head while scooping up the workpiece. And a workpiece receiving plate moving mechanism that moves so as to approach the workpiece, and the workpiece is disposed between the machining head and the workpiece receiving plate. A processing method for processing the workpiece using a machine tool provided with a workpiece restraining plate that presses the workpiece against the workpiece receiving plate after approaching the processing head to a predetermined position. A through-groove that allows passage of the transfer jig so that the transfer jig can be transferred from the transfer jig to the work receiving plate, or a processed workpiece can be transferred from the work receiving plate to the transfer jig. Is provided on the workpiece receiving plate, and a conveying step of conveying the workpiece from a workpiece insertion port or from a previous step to a position below the processing head by the conveying jig, and raising the workpiece receiving plate, Transferring from the transfer jig to the workpiece receiving plate before processing, further raising the workpiece receiving plate, A workpiece clamping step for clamping a workpiece by the workpiece receiving plate and the workpiece holding plate, a machining step for machining the workpiece to be clamped and positioned by the machining head, and the workpiece receiving plate There is provided a processing method including a post-processing transfer step of transferring the workpiece onto the conveying jig by lowering and inserting the receiving pin into the engagement hole of the workpiece.

  In the invention according to claim 1, the machining head is stationary and the workpiece is brought close to the machining head. Energy saving can be achieved because the processing head, which is a heavy object, is not moved.

  Further, a workpiece receiving plate moving mechanism is attached to the machining head, and the workpiece receiving plate is moved closer to the machining head by the workpiece receiving plate moving mechanism. While holding the workpiece between the workpiece receiving plate and workpiece holding plate, the workpiece is moved closer to the machining head. That is, since the workpiece is separated from the workpiece conveyance line and brought closer to the machining head, the conveyance speed in the workpiece conveyance line can be increased.

  Therefore, according to the present invention, it is not necessary to move the machining unit, and a machine tool that can increase the speed of the transfer line is provided.

  In addition, a receiving pin that engages with the engagement hole of the workpiece is provided on the conveying jig. Since the workpiece engagement hole is used, the conveyance jig can be simply provided with a receiving pin, and the cost of the conveyance jig can be reduced.

  In the invention which concerns on Claim 2, a some conveyance jig | tool is connected mutually, and a workpiece conveyance mechanism conveys a some workpiece | work simultaneously. Since the plurality of workpieces are integrally conveyed by the coupled conveyance jig, it is possible to improve the conveyance efficiency.

  In the invention which concerns on Claim 3, a workpiece | work receiving plate moving mechanism makes a some workpiece | work receiving plate approach a processing head simultaneously. Since the workpiece receiving plate moving mechanism clamps the plurality of workpiece receiving plates simultaneously and sends them to the machining head, the clamping function and the feeding function of the plurality of workpieces can be integrated, and the apparatus can be simplified.

  In the invention which concerns on Claim 4, at the time of a workpiece | work conveyance, a conveyance jig is arrange | positioned rather than a workpiece receiving plate at the process head side so that a conveyance jig may not interfere with a workpiece receiving plate. Since the conveying jig is disposed on the processing head side with respect to the workpiece receiving plate, the conveying jig does not interfere with the workpiece receiving plate even when the conveying jig is slid sideways when conveying the workpiece. As a result, it is only necessary to slide the transfer jig to the side, and the work transfer mechanism for moving the transfer jig can be simplified.

  In the invention according to claim 5, a through groove allowing passage of the conveying jig is provided in the workpiece receiving plate, and in the transfer process before processing, the workpiece receiving plate is raised and the workpiece is moved from the conveying jig to the workpiece. Transfer to the receiving plate. The work receiving plate is provided with a through groove that allows the transfer jig to pass, so that the work can be transferred from the transfer jig to the work receiving plate simply by raising the work receiving plate, thus simplifying the transfer process before processing. Can be. In addition, since the conveying jig is moved below the machining head, the distance from the workpiece to the machining head is short, the workpiece moving distance can be shortened, and the workpiece moving time can be shortened. As a result, productivity can be improved.

1 is a perspective view of a machine tool according to the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a modification diagram of FIG. 3. 1 is a front view of a machine tool according to the present invention. It is a principal part perspective view of a workpiece conveyance mechanism. It is a front view of a workpiece | work and a conveyance jig. It is operation | movement explanatory drawing of a machine tool. It is operation | movement explanatory drawing of a machine tool. It is a figure explaining the structure of a clamp mechanism. It is an effect | action figure of a clamp mechanism. It is a figure which shows the example of a change of a workpiece | work receiving plate. FIG. 13 is a plan view of FIG. 12. It is a figure which shows the further example of a change of a workpiece | work receiving plate.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the machine tool 10 includes a base frame 11 and 11 extending horizontally so as to be placed on a foundation or a machine base, and an inverted U-shaped frame 12 extending upward from the base frames 11 and 11. The machining head 13 supported by the frame 12, the workpiece receiving plate moving mechanism 14 provided on the machining head 13, the workpiece receiving plate 15 moved up and down by the workpiece receiving plate moving mechanism 14, and the workpiece receiving A work holding plate 16 disposed between the plate 15 and the processing head 13 is provided.

  As shown in FIG. 2, the machining head 13 includes a plurality (two in this example) of spindle shafts 18 and 19 extending downward. Cutting tools 21 and 22 such as drills and end mills are removably attached to the spindle shafts 18 and 19.

  The machining head 13 includes a drive gear 23 and driven gears 24 and 25. The drive gear 23 is rotated by a spindle motor 26, whereby the driven gears 24 and 25 are rotated. 18 and 19 are rotated at high speed. Since the processing head 13 includes a plurality of spindle shafts 18 and 19 densely, it is also called a gang head.

  Guide bars 27, 27 extend downward from the processing head 13, and the work holding plate 16 is guided along these guide bars 27, 27 so as to be movable up and down. The work holding plate 16 is suspended by cushion units 28 and 28 extending from the lower surface of the processing head 13.

  As the cushion unit 28, a structure in which a large number of disc springs are stacked in a cylinder or a structure in which a spring and a hydraulic damper are integrated is suitable. A downward reaction force that suppresses the workpiece restraining plate 16 from rising is generated.

  As shown in FIG. 3, the workpiece receiving plate moving mechanism 14 is a fluid pressure cylinder unit 30 in which a piston rod 29 extends downward along a vertical axis. The workpiece receiving plate 15 is fixed to the tip (lower end) of the piston rod 29 with nuts 31 and 31.

  The guide posts 32 and 32 are extended from the lower surface of the processing head 13. Guide bushes 33 and 33 are provided on the work receiving plate 15. The fluid pressure cylinder unit 30 is divided into a lower chamber 35 and an upper chamber 36 by a piston 34. The piston 34 can be raised by supplying high pressure fluid to the lower chamber 35, and the piston 34 can be lowered by supplying high pressure fluid to the upper chamber 36.

  The guide posts 32 and 32 are fitted into the guide bushes 33 and 33. The level of the workpiece receiving plate 15 is maintained by the guide posts 32 and 32 and the guide bushes 33 and 33. There is no fear of the workpiece receiving plate 15 shaking during the vertical movement. As a result, the workpiece receiving plate 15 can be smoothly moved up and down with only one piston rod 29.

  As shown in FIG. 4, the guide posts 32, 32 may extend upward from the work receiving plate 15. Guide bushes 33 and 33 are provided on the processing head 13, and guide posts 32 and 32 are inserted through the guide bushes 33 and 33. That is, a guide post 32 is provided on one of the machining head 13 and the workpiece receiving plate 15, and a guide bush 33 into which the guide post 32 is inserted is provided on the other, being guided by the guide post 32 and the guide bush 33, It suffices that the workpiece receiving plate 15 approaches the processing head 13, and it is arbitrary whether the guide posts 32, 32 extend upward or downward.

Next, a workpiece transfer mechanism that serves to supply a workpiece before machining to the machine tool 10 of the present invention and receive a machined workpiece from the machine tool 10 will be described with reference to FIG.
As shown in FIG. 5, the work transport mechanism 40 includes a horizontal moving member 41 that horizontally traverses the lower portion of the inverted U-shaped frame 12, an arm 42 that stands on the horizontal moving member 41 at a predetermined pitch, 42, and a conveying jig 50 that conveys the workpieces W1, W2. The conveyance jig 50 includes a support bar 43 and first and second receiving pins 44 and 45 that are extended from the support bar 43.

  That is, the workpiece conveyance mechanism 40 is a mechanism that conveys the workpiece W1 and the workpiece W2 before machining in the horizontal direction, and does not move up and down. The conveying jig 50 simply moves horizontally, and is a simple one composed of a support bar 43, large and small first receiving pins 44, and second receiving pins 45. The workpieces W1 and W2 in this embodiment are a continuously variable transmission case or a lid that closes the opening of the case, but the form, type, and use of the workpiece W1 are arbitrary.

  As shown in FIG. 6, the arm 42 is a C-type arm. The workpiece receiving plate 15 is provided with a through groove 47 having a T-shape. The through groove 47 is a groove that relatively allows the support bar 43 and the arm 42 to pass therethrough. The support bar 43 and the arm 42 do not move up and down. That is, the conveyance jig 50 does not move up and down, but only moves sideways. When the workpiece receiving plate 15 indicated by the solid line is lowered, the through groove 47 reaches the position of the imaginary line without interfering with the support bar 43 and the arm 42. That is, the workpiece receiving plate 15 can move up and down from the position of the solid line to the position of the imaginary line.

  The work receiving plate 15 is provided with a first receiving surface 48, a first positioning pin 49, a second receiving surface 51, and a second positioning pin 52.

  As shown in FIG. 7, a first positioning pin hole 64 into which the first positioning pin 49 fits and a second positioning pin hole into which the second positioning pin 52 fits below the workpieces W1 and W2. 65 is provided. When the workpiece receiving plate 15 is raised, the first positioning pin 49 is fitted into the first positioning pin hole 64, and the second positioning pin 52 is fitted into the second positioning pin hole 65 to be fitted. .

  In addition, a first engagement hole 66 into which the first receiving pin 44 is fitted and a second engagement hole 67 into which the second receiving pin 45 is fitted are provided below the workpieces W1 and W2. . The shapes of the workpieces W1 and W2 are not limited to the shapes shown in FIG. 7, and other shapes may be used as long as they are general mechanical parts other than the crankcase and the cylinder head. Further, the size, length, position, and number of the positioning pins 49, 52 and the receiving pins 44, 45 are appropriately determined according to the size and position of the positioning pin holes 64, 65 and the engagement holes 66, 67.

The operation of the machine tool having the above configuration will be described with reference to FIGS.
As shown in FIG. 8A, the workpiece receiving plate 15 is held below the workpiece W1. As described with reference to FIG. 6, since the arm 42 has a C shape so as to bypass the workpiece receiving plate 15, the arm 42 does not interfere with the workpiece receiving plate 15, and the workpiece W1 before processing is transferred to the workpiece. It is conveyed horizontally by the mechanism 40. The workpiece W1 is conveyed from the workpiece insertion port or from the previous process to the lower part of the machining head 13 and stopped at a predetermined position. (Conveying process)

  As shown in FIG. 8B, the workpiece W 1 is scooped up by the workpiece receiving plate 15 by raising the workpiece receiving plate 15. The workpiece W1 is separated from the first receiving pin 44 and the second receiving pin 45, but is positioned in the horizontal direction by the first positioning pin 49 and the second positioning pin 52, and the first receiving surface 48 and the first receiving pin 48 are 2 Vertical positioning is performed with the receiving surface 51. In the figure, the workpiece receiving plate 15 is in the middle of rising, and there is a gap between the workpiece W1 and the workpiece holding plate 16. In other words, the workpiece W1 is transferred from the conveying jig 50 to the workpiece receiving plate 15 (pre-processing transfer step).

  When the workpiece receiving plate 15 is further raised, the upper surface of the workpiece W1 comes into contact with the workpiece holding plate 16 as shown in FIG. When the workpiece receiving plate 15 is further raised, the cushion units 28 and 28 are contracted, and the cushion units 28 and 28 urge the workpiece W1 toward the workpiece receiving plate 15 in accordance with the contraction amount. That is, the workpiece W1 is clamped between the workpiece receiving plate 15 and the workpiece holding plate 16 (work clamping process).

  As shown in FIG. 9B, the workpiece W1 held between the workpiece receiving plate 15 and the workpiece holding plate 16 is machined by the cutting tools 21 and 22 of the machining head 13 (machining process).

  When the machining is completed, the workpiece receiving plate 15 is lowered in the order of FIG. 9A → FIG. 8B → FIG. 8A, and the processed workpiece W2 is transferred to the support bar 43. The receiving pins 44 and 45 are fitted into the engaging holes 66 and 67 of the workpiece W2, respectively. That is, the workpiece W2 is transferred from the workpiece receiving plate 15 to the conveying jig 50 (post-processing transfer step).

  As is clear from the above description, the machining head 13 is stopped and the workpiece W1 is moved closer to the machining head 13. Since the heavy processing head 13 is not moved, energy saving can be achieved.

  Further, a workpiece receiving plate moving mechanism 14 (FIG. 3) is attached to the machining head 13, and the workpiece receiving plate 15 is brought close to the machining head 13 by the workpiece receiving plate moving mechanism 14. The workpiece W1 is moved closer to the machining head 13 while the workpiece W1 is held between the workpiece receiving plate 15 and the workpiece holding plate 16. That is, since the workpiece W1 is separated from the workpiece conveyance mechanism 40 and brought close to the machining head 13, the conveyance speed of the workpiece conveyance mechanism 40 can be increased without being affected by the workpiece W1.

Next, a preferred modification will be described.
As shown in FIG. 10, a positioning knock pin 54 (hereinafter referred to as a knock pin 54) is provided on the workpiece receiving plate 15, a columnar member 55 is provided on the workpiece holding plate 16, and a knock hole 56 is provided in the columnar member 55. It is done. In addition, a groove 57 that opens laterally is formed in the knock pin 54, and a clamp mechanism 58 is provided in the workpiece restraining plate 16 in the vicinity of the columnar member 55.

  The clamp mechanism 58 is preferably a hydraulic cylinder with a built-in cam groove 59 formed by connecting an oblique groove and an axial groove. When the hydraulic cylinder 58 is contracted, the piston rod 29 is rotated by the oblique groove. Next, the piston rod 29 moves in the axial direction without rotating due to the axial groove. The hydraulic cylinder 58 is a cylinder unit that continuously performs turning and linear movement.

First, the workpiece receiving plate 15 is raised by the piston rod 29. Then, the knock pin 54 is fitted into the knock hole 56.
As shown in FIG. 11, the clamp mechanism 58 is operated. Then, after the clamping claw 61 turns about 90 ° as indicated by the arrow (1), it moves as indicated by the arrow (2), and the knock pin 54 is attracted to the columnar member 55. As a result, the workpiece holding plate 16 is clamped to the workpiece receiving plate 15.

  That is, the workpiece holding plate 16 is positioned on the workpiece receiving plate 15 by the knock pin 54 and the knock hole 56. Since the workpiece holding plate 16 is positioned on the workpiece receiving plate 15, the position of the workpiece to be clamped is accurately determined.

  In FIG. 9, during machining by the machining head 13, a force corresponding to cutting resistance is applied to the workpiece W <b> 1. When there is no clamping mechanism, it is necessary to strongly press the workpiece W1 with the workpiece holding plate 16, and therefore it is necessary to strengthen the elastic members (cushion units 28, 28) attached to the workpiece holding plate.

  In this regard, with the structure of FIG. 11, by providing the clamp mechanisms 58, 58, the elastic member 28 (FIG. 2) attached to the workpiece restraining plate 16 can be weak, and the elastic member can be reduced in weight and size. Note that the columnar member 55 may be provided on the workpiece receiving plate 15 and the knock pin 54 may be provided on the workpiece holding plate 16 with the top and bottom reversed.

  As shown in FIG. 12, a plurality of processing heads 13 (FIG. 1) may be provided, and a plurality of conveying jigs 50 and 50 may be provided according to the number of the plurality of processing heads 13. The plurality of conveying jigs 50 and 50 are connected to each other. A plurality of workpiece receiving plates 15, 15 may be integrated, and two workpieces W 1, W 1 may be placed on one workpiece receiving plate 15. By integrating the plurality of workpiece receiving plates 15 and 15, the plurality of workpiece receiving plates 15 and 15 may be moved up and down simultaneously by one workpiece receiving plate moving mechanism 14.

  In this case, as shown in FIG. 13, the center of the piston rod 29 can be made to coincide with the total center of gravity obtained by integrating the center of gravity of the two workpieces W1 and W1 and the center of gravity of one workpiece receiving plate 15. . Since the balance is achieved, the workpiece receiving plate 15 can be raised and lowered with only one piston rod 29.

  Ideally, the center of the piston rod 29 is made to coincide with the center of gravity of the piston rod 29. However, the center of the piston rod 29 is allowed to be offset from the center of gravity of the piston rod 29 by the outer diameter dimension. . This is because a small imbalance is allowed by the guide posts 32 and 32.

  As a result, as shown in FIG. 3, the workpiece receiving plate moving mechanism 14 can be completed with one fluid pressure cylinder unit. If one fluid pressure cylinder unit is used, it is possible to reduce the equipment cost for simplifying the apparatus.

  Note that the workpiece receiving plate moving mechanism 14 can also be composed of a plurality (a plurality) of fluid pressure cylinder units. That is, as shown in FIG. 14A, the workpiece receiving plate 15 may be moved up and down by two piston rods 29 and 29. In this case, a virtual central axis 63 formed by integrating a plurality of piston rods 29, 29 into one is defined. Specifically, the midpoint of the line 62 connecting the piston rods 29, 29 becomes the virtual central axis 63.

  The two piston rods 29 and 29 are positioned so that the virtual center axis 63 matches or substantially matches the total center of gravity. The piston rods 29 and 29 are less likely to be bent. As a result, there is no need to increase the diameter of the piston rods 29, 29, and the diameter can be reduced, and the work receiving plate moving mechanism 14 can be reduced in size and weight.

  Moreover, you may make it raise / lower the workpiece | work receiving plate 15 with the three piston rods 29, 29, 29 in FIG.14 (b). In this case, the central piston rod 29 becomes the virtual central axis 63. The three piston rods 29, 29, 29 are positioned so that the virtual center axis 63 matches or substantially matches the total center of gravity. The piston rods 29, 29, 29 are less likely to be bent. As a result, there is no need to increase the diameter of the piston rods 29, 29, 29, the diameter can be reduced, and the work receiving plate moving mechanism 14 can be reduced in size and weight.

  The clamp mechanism 58 described in FIGS. 10 and 11 can be simply combined with an inexpensive rotary actuator and an inexpensive cylinder, and is not limited to the structure of the embodiment.

  The present invention can be applied to a machine tool for machining a workpiece with a machining unit.

  DESCRIPTION OF SYMBOLS 10 ... Machine tool, 13 ... Processing head, 14 ... Work receiving plate moving mechanism, 15 ... Work receiving plate, 16 ... Work holding plate, 40 ... Work conveyance mechanism, 44, 45 ... Receiving pin, 47 ... Through groove, 49, 52 ... Positioning pin, 50 ... Conveying jig, 64, 65 ... Positioning pin hole, 66, 67 ... Engagement hole, W1 ... Work before processing, W2 ... Work processed.

Claims (8)

A machine tool that conveys a workpiece by a workpiece conveyance mechanism and processes the workpiece by a stationary machining head,
A conveyance jig that is provided in the workpiece conveyance mechanism and conveys the workpiece from a workpiece insertion port or from a previous process to a position below the machining head;
A receiving pin that is provided on the conveying jig and engages with an engagement hole of the workpiece;
A workpiece receiving plate that is provided in the machining head and waits for the workpiece to arrive below the machining head;
A positioning pin that is provided on the workpiece receiving plate and engages with a positioning pin hole of the workpiece at a portion different from the engagement hole ;
A workpiece receiving plate moving mechanism that is provided in the processing head and moves the workpiece receiving plate so as to approach the processing head while scooping up the workpiece;
A workpiece restraining plate that is disposed between the machining head and the workpiece receiving plate and presses the workpiece against the workpiece receiving plate after the workpiece has approached the machining head to a predetermined position;
A machine tool characterized by comprising:   A plurality of the processing heads are provided, a plurality of the transport jigs are provided according to the number of the processing heads, the plurality of transport jigs are connected to each other, and the work transport mechanism is a plurality of the work transport mechanisms. The machine tool according to claim 1, wherein the workpiece is simultaneously conveyed. A plurality of the processing heads are provided, and a plurality of the work receiving plates are provided according to the number of the processing heads. The plurality of work receiving plates are integrated with each other, and the one work receiving plate is moved. wherein a plurality of stacked on the work receiving plate wherein at mechanism to approach the workpiece simultaneously the machining head, machine tool according to claim 1.   The said conveyance jig is arrange | positioned rather than the said workpiece receiving plate at the said process head side so that the said conveyance jig may not interfere with the said workpiece receiving plate at the time of conveyance of the said workpiece | work. Machine tools. A conveyance jig that is provided in a workpiece conveyance mechanism that conveys a workpiece, and conveys the workpiece from a workpiece insertion port or from a previous step to a position below a stationary machining head that processes the workpiece;
A receiving pin that is provided on the conveying jig and engages with an engagement hole of the workpiece;
A workpiece receiving plate that is provided in the machining head and waits for the workpiece to arrive below the machining head;
A positioning pin that is provided on the workpiece receiving plate and engages with a positioning pin hole of the workpiece at a portion different from the engagement hole ;
A workpiece receiving plate moving mechanism that is provided in the processing head and moves the workpiece receiving plate so as to approach the processing head while scooping up the workpiece;
A workpiece restraining plate that is disposed between the machining head and the workpiece receiving plate and presses the workpiece against the workpiece receiving plate after the workpiece has approached the machining head to a predetermined position;
A machining method for machining the workpiece using a machine tool comprising:
In order to transfer the workpiece before processing from the conveying jig to the workpiece receiving plate, or to transfer the processed workpiece from the workpiece receiving plate to the conveying jig, pass the conveying jig. An allowable through groove is provided in the workpiece receiving plate,
A transporting step of transporting the workpiece from the workpiece input port or from the previous step to the lower portion of the processing head by the transporting jig;
Raising the workpiece receiving plate and transferring the workpiece from the transfer jig to the workpiece receiving plate before processing;
A workpiece clamping step of further raising the workpiece receiving plate and clamping the workpiece between the workpiece receiving plate and the workpiece holding plate;
A processing step of processing the workpiece to be clamped and positioned by the processing head;
A post-processing transfer step of transferring the work to the conveying jig by lowering the work receiving plate and inserting the receiving pin into the engagement hole of the work;
The processing method characterized by including.   A plurality of the processing heads are provided, a plurality of the transport jigs are provided according to the number of the processing heads, the plurality of transport jigs are connected to each other, and the work transport mechanism is a plurality of the work transport mechanisms. The working method according to claim 5, wherein the workpiece is simultaneously conveyed. A plurality of the processing heads are provided, and a plurality of the work receiving plates are provided according to the number of the processing heads. The plurality of work receiving plates are integrated with each other, and the one work receiving plate is moved. wherein a plurality of stacked on the work receiving plate wherein at mechanism to approach the workpiece simultaneously the machining head, tool method according to claim 5.   The said conveyance jig is arrange | positioned rather than the said workpiece receiving plate at the said process head side so that the said conveyance jig may not interfere with the said workpiece receiving plate at the time of conveyance of the said workpiece | work. Work method.

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