JPH0413534A - Work supporting device - Google Patents

Abstract

PURPOSE:To exactly position the center of a work and index the work-machined position efficiently and with high accuracy by pushing up the work by a pressing positioning face to position it coaxially by means of upper and lower locating pins, and pressing the work on an upper positioning face to position it. CONSTITUTION:A lower locating pin 16c driven to be raised is fitted into a hole W2 for positioning a work W, and a pressing positioning face 16b abuts on the face of a lower piece Wa to push up the work, while a positioning hole W3 is fitted onto an upper locating pin 22b, the upper face of an upper piece Wb abuts on an upper positioning face 22a, and the positioning holes W2 and W3 are fitted respectively onto the upper and lower locating pins 16c, 22b with the work being caught between the pressing positioning face 16 and the upper positioning face 22a, and thus the work is positioned to the same axis from upper and lower sides. When a rotary table 10 is rotated, a lower holder 11 and an upper holder 12 as well as supporting side plates 13 and an upper base 14 are integrally rotated through a specified angle around the axis of the locating pins 16c and 22b to index the work-machined position.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a workpiece in which a workpiece is installed which has positioning holes at the top and bottom and has a plurality of workpiece positions on a concentric circumference around the positioning hole. The present invention relates to a workpiece support device whose position can be rotated and indexed.

[Prior Art] In conventional machining equipment, in order to determine the position of the workpiece to be machined and perform the machining, the table is shifted in two directions of X and Y while the workpiece is clamped on the table by a workpiece jig. , and two processing heads with tools.
By moving it in the axial direction, and by this relative movement in the three-dimensional direction,
The position of the workpiece to be machined was determined.

In addition, in conventional equipment, when it is necessary to process a workpiece while it is lifted, the workpiece is lifted together with a table etc. using a predetermined hydraulic pressure, and this hydraulic pressure supports the weight of the workpiece and table as well as the machining pressure from the tool.

[Problems to be Solved by the Invention] The conventional workpiece indexing method described above moves the workpiece and tool relatively in three-dimensional directions, so it is not suitable for workpieces whose workpiece positions are random. Although,
For example, in the case of a workpiece whose workpiece position is on a concentric circumference with respect to a certain positioning center, it is inefficient to determine the workpiece position by three-dimensional relative movement in X-Y-Z.

In addition, when indexing a workpiece in which the workpiece position is formed on the circumference in this way, it is efficient to rotate the workpiece around the positioning center and index the workpiece position by this rotational movement. In this case, it is conceivable to install a positioning part such as a locate pin at the rotation center of the rotary table and position the workpiece using the bottom surface of the workpiece as a reference. However, if the workpiece positioning center is placed only on the rotary table side, However, due to the rotational operation of the rotary table, there is a limit to the ability to rotate the workpiece with high precision without rotational wobbling.

In addition, in the past, when it was necessary to lift and process a workpiece, the workpiece was lifted using a predetermined hydraulic pressure, and that hydraulic pressure supported the weight of the workpiece and the machining pressure. It is necessary to raise the workpiece and table by giving

Therefore, when an attempt is made to position the upper surface of the workpiece, for example, this excessive hydraulic lifting force acts on the workpiece, causing problems such as distortion of the workpiece.

The present invention solves the above-mentioned conventional problems, and is capable of accurately positioning the center of a workpiece whose workpiece position is located on a concentric circumference around a positioning hole, and efficiently and highly accurately indexing the workpiece position. Another object of the present invention is to provide a workpiece support device that can perform a strong ramp with a relatively small force without increasing the clamping pressure when clamping the workpiece.

1. Means for Solving Problems] The workpiece support device according to the present invention has a coaxial positioning hole on the upper and lower surfaces, and a workpiece having a plurality of cylindrical workpiece positions on a concentric circumference around the positioning hole. The work supporting device is supported by a rotary table that indexes and rotates at predetermined angles, a lower locate pin that is driven up and down at the rotation center of the rotary table and is fitted into a positioning hole on the lower surface of the work. A suppressing positioning section moves up and down together with the lower locating pin to press the lower surface of the workpiece upward; an upper positioning section faces the upper part of the rotary table and hits the upper surface of the workpiece pressed upward; and an upper locating pin into which a positioning hole on the upper surface of the processed workpiece is fitted, and the rotation center of the rotary table is arranged at an eccentric position with respect to the tool provided on the processing head. be.

Further, in the above means, a hydraulic drive section for raising and lowering the lower locating pin and the pressing positioning section is provided, and an oil supply path that supplies hydraulic pressure for raising the lower locating pin and the pressing positioning section is provided in the hydraulic driving section for raising and lowering the lower locating pin and the pressing positioning section. The system is equipped with a valve that shuts off the oil supply path after the oil has been pumped, and a one-way valve that is placed in the path that connects the front and back of this valve to prevent oil from returning from the hydraulic drive unit side.

[Operation] In the above means, the lower locating pin that rises on the rotary table is inserted into the positioning hole formed on the lower surface of the workpiece, and is positioned by the suppressing positioning part that rises together with the lower locating pin, and the workpiece is lifted by the suppressing positioning part. . Then, the upper surface of the workpiece is pressurized by an upper positioning section facing the top of the rotary table, and the workpiece is positioned from the upper surface by an upper locating pin on the upper surface of the workpiece. In the machining operation, the rotary table is rotated to move the workpiece position to a position facing the tool. Furthermore, the machining depth by the tool can be tracked using the upper positioning portion as a reference.

In addition, the oil supply path that is supplied to the hydraulic drive unit that raises the lower locating pin and the press positioning unit is shut off by a valve after the raising is completed, and a one-way valve installed in parallel with this valve prevents the oil from moving in the return direction. Therefore, even if the weight of the workpiece and machining pressure from the tool from above are applied after raising the lower locating pin, etc., the workpiece can be firmly supported from below by preventing the oil from returning in the oil supply path. . Therefore, there is no need to apply excessive lifting hydraulic pressure when lifting the workpiece, and the inconvenience of causing distortion to the workpiece is eliminated.

[Example 1 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a boring machine equipped with a workpiece support device according to the present invention, and FIG. 2 is a right side view thereof.

In FIGS. 1 and 2, reference numeral 1 indicates the base of the boring machine. A column 2 that moves in the Y direction is provided on the base 1. A saddle 3 that moves in two directions is provided on the front surface of the column 2 (the left side surface in FIG. 2).
This saddle 3 has a spindle head 4 as a processing head.
is provided. This spindle head 4 holds a boring bar as a tool T. The spindle head 4 has an address function and a correction function. As shown in FIG. 4, the tip of a boring bar serving as a tool T is provided with a blade Ta that protrudes and retracts laterally.

As shown in FIGS. 1 and 2, a rotary table (index table) 10 is provided on the base 1. As shown in FIGS. This rotary table 10 is rotated and indexed by NG control. On the zero-rotary table 10, a lower holder 11 and an upper holder 12 located at the upper end thereof are provided. Further, a pair of support side plates 13 are fixed to the upper end of the lower holder 11, and an upper base 14 is further provided extending over the upper surface of the support side plates 13. FIG. 3 is an enlarged front view showing a portion from the rotary table to the upper base, and FIG. 4 is a side sectional view thereof.

As shown in FIG. 4, a lower holder 11 and an upper holder 12
is fixed with bolts 15.

Also, the piston 1 is attached to the lower holder 11 and the upper holder 12.
6 is inserted through it so that it can be moved up and down. This piston 16
is provided at the rotation center of the rotary table 10.

Further, as shown in FIG. 4, the center of the piston 16, that is, the rotation center axis of the rotary table 1O, is eccentrically arranged to the left in the figure with respect to the axial position of the tool T. A rising pressurizing chamber P is formed between the lower surface of the flange 16a of the piston 16 and the bottom cover 17 of the lower holder 11,
A downward pressurizing chamber P is formed between the upper surface of the flange 16a and the lower surface of the upper holter 12. Hydraulic pressure is applied from the boat 18a to the upward pressurizing chamber P1, and this pressure causes the piston 16 to rise. A boat 18b is communicated with the pressurizing chamber P for lowering. The piston 16 is lowered by this pressure in the pressurizing chamber P2. As shown in FIG. 2, there is a rotary joint 19 in the rotary table 10.
Each boat 18a and 18b shown in FIG. 4 is connected to the hydraulic circuit shown in FIG. 7 through this rotary joint 19. Note that the symbols 20a and 20 shown in FIG.
b, 20c and 20d are oil seal rings.

A suppressing positioning surface 16b is formed at the upper end of the piston 16, and a lower locating pin 16c projects upward from the center thereof.

FIG. 5 is an enlarged plan view of the upper base 14 located above;
FIG. 6 is a sectional view thereof. A shaft member 22 is buried in the center of the lower surface of the upper base 14, and an upper positioning surface 22a is formed on the lower surface of the shaft member 22. Furthermore, an upper locating pin 22b that protrudes downward is formed in the center of the upper positioning surface 22a. is formed. This upper locate pin 22b is located coaxially with the lower locate pin 16c. As shown in FIG. 6, the shaft member 22 is formed with an air nozzle 22c that opens to the upper positioning surface 22a, and the upper base 14 is formed with an air boat 14a that communicates with the air nozzle 22c through the space A. . Air at a predetermined pressure is jetted downward from the air nozzle 22c via the air boat 14a and the space A from an air supply section (not shown). Then, when the upper surface of the workpiece W rises and comes into close contact with the upper positioning surface 22a, the air nozzle 22c is closed.
By detecting the pressure increase in the space A and the air boat 14a, it is detected that the upper surface of the workpiece W is completely positioned, that is, the clamping is completed. Further, the upper base 14 has 5 holes distributed on the circumference with the upper locating pin 22b as the center.
Tool insertion holes 14b are formed at certain locations.

Furthermore, as shown in FIG. 6, discharge pressing members 23 are provided at a plurality of locations on the lower surface of the upper base 14. A shaft 24 is integrally fixed to this discharge pressing member 23,
This shaft 24 is slidably inserted into the upper base 14. Further, the discharge pressing member 23 is urged downward by a spring 25. In Fig. 6, the work W shown by the chain line
The upper surface is in close contact with the upper part 1 determining surface 22a, and at this time, the discharge pressing member 23 is pressed against the upper surface of the workpiece W and retracted upward against the spring 25. When the push-up force on the workpiece W is removed when the clamp is released, the discharge pressing member 23 presses the workpiece W downward due to the biasing force of the spring 25, and this biasing force causes the workpiece W to move away from the upper locating pin 22b. The ejector is removed, and the close contact between the workpiece W and the upper positioning surface 22a is released.

As shown in FIGS. 3 and 4, the support side plate 13
A work supply guide is provided on the opposing inner surface of the . This work supply guide consists of a lower guide 31 and an upper guide 32.
It consists of As shown in FIG. 3, the lower guide 31 has a guide surface 31a that guides the lower surface of the work W and a guide surface 31b that guides the lower side surface of the work W.

When the piston 16 is descending, the upper end surface of the lower locating pin 16c retracts below the guide surface 31a. As shown in FIG. 4, the lower guide 31 extends laterally from a position above the lower locating pin 16c. Further, the upper guide 32 is shorter than the lower guide 31, and has guide surfaces 32a for guiding both sides of the workpiece W, as shown in FIG. Further, as shown in FIG. 4, a workpiece bushing 33 is opposed to the right side in the figure, which is approximately at the middle height between the lower guide 31 and the upper guide 32. This work button 33 is held by a rod 34,
This rod 34 is driven to the left in FIG. 4 by a cylinder mechanism (not shown). During this drive, the workpiece W is pushed out to the left in FIG. 4 by the workpiece pusher 33.

Next, the detection mechanism provided at the lower part will be explained.6 As shown in FIG. 4, a detection bar 41 extending orthogonally to the piston 16 is inserted into the lower holder 11. The detection bar 41 moves forward and backward as its large diameter portion 42 slides within the hole 11a. The tip 41a of the detection bar 41 is rounded and faces the outer periphery of the piston 16. Further, the detection bar 41 is biased by a spring 43 in a direction in which the tip 41a is pressurized by the piston ]6. Further, a proximity switch S1 is opposed to the rear end 41b of the detection bar 41. This proximity switch S is of a magnetic detection type, for example, and has a detection bar 4.
When the rear end 41b of 1 approaches the proximity switch S,
This is detected. The piston 16 is formed with a narrow diameter portion 16d. In the fourth section, the piston 16 is rising, and when the piston 16 rises to the top, the tip 41a of the detection bar 41 comes off the lower end of the small diameter part 16d and moves to the large diameter part. , the detection bar 41 moves to the right in FIG. 4, and this is detected by the proximity switch S1. Thereby, it is detected that the piston 16 has reached the top dead center. Similarly, when the piston 16 descends, the tip 41a of the detection bar 41 moves from the upper end of the small diameter portion 16d to the large diameter portion, the detection bar 41 is pushed out to the right in the figure, and at this time the rear end of the detection bar 41 41b is detected by the proximity switch S1, and it is detected that the piston 16 has reached the bottom dead center.

Further, as shown in FIG. 4, a detection lever 45 is provided on the right side of the lower guide 31 in the drawing. This detection lever 45 is used to detect loading of the workpiece W. This detection lever 45 has a crank shape and is rotatably supported by a shaft 46. The tip 45a of the detection lever 45 is rounded. Although the structure of the work W will be described later, a recess W is formed at the bottom of the work W on the right side in FIG. 4. When the workpiece W is sent by sliding on the lower guide 31 and the recess W1 is fitted into the tip 45a of the detection lever 45, the detection lever 45 is rotated counterclockwise as shown by the solid line, and the rear end is rotated counterclockwise as shown by the solid line. 45b approaches the proximity switch S2, and the six workpieces W whose loading is detected are ejected to the left in FIG. is separated from the tip of the detection lever 45. At this time, the detection lever 45 rotates clockwise as shown by the chain line due to its own weight or the biasing force of a spring, and the rear end 45b of the detection lever 45 moves away from the proximity switch 45b. This detects whether the workpiece is being ejected or the position of the workpiece is being elevated.

Furthermore, as shown in FIG. 4, a cover 47 is provided on the side surface of the lower holder 11. This cover 47 is provided at an angle so that chips and coolant during machining can easily flow along this inclined surface. Further, the upper surfaces of the lower holder 11 and the upper holder 12 are also sloped surfaces, making it easier for chips and coolant to flow.

FIG. 7 shows a hydraulic circuit for raising and lowering the piston 16. In this embodiment, mechanisms other than the piston 16 are also hydraulically driven, but in FIG. Only the hydraulic pressure supply path is shown, and other hydraulic pressure supply paths are omitted.

In FIG. 7, reference numeral 51 indicates a hydraulic pressure supply section.

The hydraulic pressure pressurized by the pump 52 is routed to 5354.55.
It is connected to the electromagnetic switching valve 56 via the. Further, the negative pressure side path (tank boat) is connected to the electromagnetic switching valve 56 via 57, 58, 59. This electromagnetic switching valve 56
By switching, the pressurized hydraulic path is switched.

One path extending from this electromagnetic switching valve 56 is connected to an electromagnetic cutoff valve 62 via 61. Further route 63
The boat 18a in FIG. 4 is communicated with the upward pressurizing chamber P. The other path 64 extending from the electromagnetic cutoff valve 62 communicates with the lowering pressurizing chamber P2 from the boat 18b in FIG. Also, a check valve 65 is connected between the paths 61 and 63 before and after the electromagnetic cutoff valve 62.
are connected via. This check valve 65 is a one-way valve that allows oil to move in the direction of the arrow in FIG. 7 and prevents oil from moving in the direction opposite to the arrow. Further, a regulating valve 66 is provided between the two output paths 61 and 64 from the electromagnetic switching valve 56.

Next, the structure of the workpiece loaded on the workpiece support device will be explained.

FIG. 8 is a plan view of the workpiece W, and FIG. 9 is a front view thereof.

This work W is a case of a compressor for an on-vehicle air conditioner. This work W consists of a lower piece Wa and an upper piece W.
b, and both pieces are combined into the state shown in FIG. 9 and then assembled. A recess W1 for operating the aforementioned detection lever 45 is formed at the bottom right end of the lower piece Wa. Further, a positioning hole W2 is formed in the center of the bottom surface of the lower piece Wa, and a positioning hole W is formed in the center of the top surface of the upper piece Wb. The upper and lower positioning holes W8 and W are coaxially located. Furthermore, a plurality of holes W4 are formed on the circumference around each of the positioning holes W and W. This hole W4 is formed to penetrate the upper piece wb and the lower piece Wa, and the inner surface of this hole W4 is the processed position in this embodiment.

Next, the processing work will be explained.

When supplying the workpiece W, the hydraulic pressure supply switching described later allows
The upper pressurizing chamber P2 in FIG. It has moved below the surface 31a.

The workpiece W is placed on the portion of the lower guide 31 extending to the left in FIG. 4, and is pushed to the right in FIG. 4 manually or by automatic operation such as cylinder pressure. The workpiece W is pushed into a position above the piston 16 with its lower surface being guided by the guide surface 31a and its side surface being guided by the guide surface 31b. Work W
When it is completely pushed in, the recess Wl (see FIG. 9) on the bottom edge of the lower piece Wa of the workpiece W hits the tip 45a of the detection lever 45 shown in FIG. Rotate clockwise. This rotational movement causes the rear end 45b of the detection lever 45 to move to the proximity switch S.
2 is detected, and thereby it is detected that the workpiece W has been inserted reliably.

When the workpiece W is completely inserted, by switching the hydraulic path, the lower pressure chamber P in FIG. 4 is pressurized, and the upper pressure chamber P2 is reduced to the tank boat pressure. Therefore, the piston 16 is driven upward. The lower locate pin 16c at the upper part of the rising piston 16 is the lower piece W of the workpiece W.
It is fitted into the positioning hole W2 of a, and the pressing positioning surface 1
6b hits the lower surface of the lower piece Wa, and as the piston 16 rises, the workpiece W is lifted by the pressing positioning surface 16b and moves away from the guide surface 318 of the lower guide 31. Then, the positioning hole W on the upper surface of the upper piece wb of the workpiece W is fitted into the upper locating pin 22b shown in FIG.
corresponds to Then, the workpiece W is sandwiched between the pressing positioning surface 16b and the upper positioning surface 22a, and the upper and lower positioning holes W2 and W3 of the workpiece W are fitted into the upper and lower locating pins 16c and 22b, so that they are coaxially aligned from above and below. Positioned. At this time, the discharge pressing member 23 shown in FIG. 6 is pressed against the upper surface of the workpiece W and is raised against the biasing force of the spring 25.

After the clamping of the workpiece W is completed, the rotary table lO is rotated by the N'C control motor, and the lower holder 11 is rotated by the N'C control motor.
The upper holder 12, the support side plate 13, and the upper base 14 are integrally connected to the locate pins 16c and 22.
Rotate by a predetermined angle around the axis b. As a result, the position of the workpiece W to be processed is indexed. When the workpiece W is clamped, the machining position W4 of the workpiece W and the tool insertion hole 14b of the upper base 14 shown in FIG.
By the rotation under C control, each tool insertion hole 14b and the hole W of the workpiece W are sequentially indexed to the lower position of the tool T.

After the indexing operation is completed, the saddle 3 shown in FIG. 1 is lowered and the spindle head 4 is lowered. At this time, the blade Ta at the lower end of the tool T shown in FIG. 4 has retreated in the radial direction. The tool T in this state is inserted into the hole W of the workpiece W from the tool insertion hole 14b of the upper base 14, the blade Ta protrudes laterally, the spindle head 4 rotates, and the inner peripheral surface of the hole W4 is finished. Processing etc. are carried out. In the case of the workpiece W shown in FIGS. 8 and 9, it is assumed that a lower piece Wa and an upper piece wb are joined together. It is also assumed that hole W4 will be bored, and tool T will be used to drill the upper piece wb.
and the hole W4 of the lower piece Wa are bored simultaneously.

The chips and coolant at this time flow downward from the hole W4 and along the sloped surfaces of the upper holder 12 and lower holder 11 and the sloped surface of the cover 47.

When machining of one hole W4 is completed, the blade Ta of the tool T
is retracted, the spindle head 4 is raised, and the tool T is pulled out upwards.First, the rotary table 10 is rotated to move to the next machining position, that is, the adjacent hole W4 and the tool insertion hole 1.
4b moves below the tool T to perform the machining operation.

When the machining of all the holes W4 is completed and the tool T is separated from the workpiece W and the upper base 14, the fourth
The upper pressurizing chamber P2 shown in the figure is pressurized, and the piston 16 descends. Pressure positioning surface 1 formed on piston 16
6b lowers, the workpiece W also lowers, and the positioning hole W on the upper surface of the workpiece W is connected to the upper locating pin 22b.
removed from At this time, the discharge suppressing member 23 shown in FIG.
Since the workpiece W is pressed downward by the biasing force of the spring 25, the upper positioning hole W of the workpiece W can be reliably removed from the upper locating pin 22b. When the workpiece W is lowered to a position where it touches the guide surface 31a of the lower guide 31, the lower locating pin 16c is removed from the hole W on the lower surface of the workpiece W due to further lowering of the piston 16.

The descended workpiece W is moved to the workpiece pusher 33 shown in FIG.
It is pushed by the lower guide 31, slides on the guide surface 31a of the lower guide 31, is sent out to the left in FIG. 4, and is discharged manually or automatically.

As for the detection operation to determine whether the workpiece W is raised and clamped, first, the raising and lowering of the piston 16 is performed when the tip 41a of the detection par 41 shown in FIG. The detection bar 41 moves to the right in the figure when it comes off to the large diameter portion, and this is confirmed by being detected by the proximity switch S1. Furthermore, depending on whether the aforementioned detection lever 45 is in the solid line state or the chain line state in FIG. will be carried out. Furthermore, the upper positioning shown in Fig. 6 @ 22
The workpiece W comes into close contact with a, and the air nozzle 22c is blocked.
By increasing the pressure within the air boat 14a, it is detected that the workpiece W is securely clamped.

Next, the operation of the hydraulic circuit shown in FIG. 7 will be explained.

When the piston 16 is raised to perform a work clamping operation, the electromagnetic switching valve 56 is switched to the (al side), and the electromagnetic cutoff valve 62 is switched to (C).
The hydraulic pressure supplied by the hydraulic pump 52 of No. 1 is routed through the path 53.
54.55. (a) 61, ic), and 63, it is supplied from the boat 18a shown in FIG. 4 to the pressurizing chamber P, and the piston 16 is raised. When the clamping is completed, the electromagnetic cutoff valve 62 is switched to (d+. This blocks the paths 61 and 63. Also, in the check valve 65 which is a one-way valve, a leak occurs in the extension path of the path 63 (for example, When the oil pressure decreases due to a leakage from the seal part of the pressurizing chamber, etc., the paths 61 to 6
In this way, the electromagnetic cutoff valve 56 is switched, and the check valve 65
By providing this, even if the weight of the workpiece W and the pressurizing force by the tool T act on the piston 16, the hydraulic pressure is prevented from returning in the direction of the path 55, and the piston 16 can be prevented from descending. That is, during clamping operation, by switching the electromagnetic cutoff valve 62 to (cl), it is possible to raise the piston 16 and clamp the workpiece W without applying excessive pressure, and after completion of clamping, the electromagnetic cutoff valve 62 By switching to (d) to prevent the oil pressure from returning, the supporting pressure of the workpiece W can be made substantially excessive.

Next, when releasing the clamp, the electromagnetic cutoff valve 62 is switched to (c), and the electromagnetic switching valve 56 is switched to fb). As a result, the route 55 is switched to the 64 side, and the route 59 is switched to the route 64 side.

The pressurizing force from the pump 52 is then supplied from the path 64 to the pressurizing chamber P shown in FIG. 4, and the piston 16 is lowered.

Further, a regulating valve designated by the reference numeral 66 is used to reduce and adjust the hydraulic pressure in the paths 53.degree. 54.55 to the hydraulic pressure in the path 61.63 necessary for the clamping operation.

In addition, in the embodiment shown in the figure, a case of a compressor having a hole W4 on the circumference is shown as an example of the workpiece W, but a workpiece in which a plurality of workpiece positions are provided on the circumference around the positioning hole is also used. It can be anything.

[Effect 1 As described above, according to the invention described in claim 1, the workpiece is rotated around the positioning hole to proportionate the position of the workpiece,
Since processing is performed using a tool, the position of the workpiece to be processed can be efficiently determined. In addition, since the workpiece is pushed up by the pressing positioning surface and coaxially positioned by the upper and lower locate pins, the rotation center axis of the workpiece can be reliably positioned from above and below, and the workpiece rotation for indexing the workpiece position can be Eliminates center axis deviation and enables highly accurate indexing. Furthermore, the workpiece is pushed up by the pressing positioning surface and is pressed against the upper positioning surface located above and positioned, so the dimensions of the machining position of the tool that starts machining from above can be tracked based on the top surface of the workpiece. , machining depth positioning, etc. can be performed with high precision.

According to the invention as claimed in claim 2, when raising the lower locating pin and the suppressing positioning surface, an excessive hydraulic pressure that would cause distortion to the workpiece is not required, and the workpiece can be clamped with a relatively small force. can firmly bear the weight of the workpiece as well as the machining pressure exerted by the tool on the workpiece.

[Brief explanation of drawings]

FIG. 1 is a front view of a boring machine equipped with a workpiece support device according to the present invention, FIG. 2 is a right side view thereof, and FIG. 3 is a partially enlarged front view of FIG. 4
The figure is a side sectional view of Fig. 3, Fig. 5 is an enlarged plan view showing the upper base, Fig. 6 is a sectional view of the upper base, Fig. 7 is a hydraulic circuit diagram, and Fig. 8 is a plan view showing an example of the workpiece. FIG. 9 is a front view thereof. W...Work, T...Tool, 4...Spindle head, 10...Rotary table, 11...Lower holder, 12...Upper holder, 14...Upper base, 1
6...Piston, 16b...Press positioning surface, 16
c... Lower locate pin, 22... Shaft member, 22a
...Upper positioning surface, 22b...Upper locating pin, 31...Lower guide, 32...Upper guide, 52
...Pressure pump, 56...Solenoid switching valve, 62...
Electromagnetic cutoff valve, 65...check valve (one-way valve).

Claims (1)

[Scope of Claims] 1. A workpiece support device that supports a workpiece having a coaxial positioning hole on the upper and lower surfaces and a plurality of workpiece positions on a concentric circumference centered on the positioning hole, a rotary table that indexes and rotates at predetermined angles; a lower locate pin that is driven up and down at the rotation center of the rotary table and fitted into a positioning hole on the lower surface of the workpiece;
A pressing positioning part moves up and down together with the lower locating pin to press the lower surface of the workpiece upward; an upper positioning part faces the upper part of the rotary table and hits the upper surface of the workpiece pressed upward by the pressing positioning part; and the upper positioning part presses upward. and an upper locating pin into which a positioning hole on the upper surface of the workpiece is fitted, and the rotation center of the rotary table is arranged eccentrically with respect to the tool provided on the processing head. The device 2 is provided with a hydraulic drive unit that raises and lowers the lower locating pin and the pressing positioning unit, and an oil feed path that supplies hydraulic pressure for lifting to this hydraulic driving unit is provided with a hydraulic drive unit that moves the lower locating pin and the pressing positioning unit upward and downward. Claim 1: A valve that shuts off an oil path, and a one-way valve that is arranged in a path that connects the front and back of this valve and prevents oil from returning from the hydraulic drive unit side.
Workpiece support device described