JP2828486B2 - Work support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a work in which a plurality of work positions are arranged on concentric circles around a positioning hole above and below the positioning hole. The present invention relates to a work supporting device whose position can be rotationally indexed.

[Conventional technology]

In a conventional processing apparatus, in order to perform processing by determining a position to be processed of a work, the table is shifted in two directions of XY while the work is clamped on the table by a work jig, and the tool is moved. The processing head having the workpiece is moved in the Z-axis direction, and the relative position in the three-dimensional direction is used to determine the position of the workpiece to be processed.

Further, in the conventional apparatus, when it is necessary to perform the processing while the work is lifted, the work is lifted together with the table or the like by a predetermined oil pressure, and the self-weight of the work or the table and the processing pressure by the tool are supported by the oil pressure.

[Problems to be solved by the invention]

The above-described conventional work indexing method moves the work and the tool relatively in the three-dimensional direction, and thus is suitable for a work in which the work position of the work is randomly. On the other hand, in the case of a workpiece having a processing position on a concentric circle, it is inefficient to determine the processing position by a three-dimensional relative operation of XYZ. Further, in the indexing of the work having the processing position formed on the circumference as described above, it is efficient to rotate the work around the positioning center as an axis, and to determine the processing position by this rotating operation. In this case, it is conceivable that a positioning portion such as a locating pin is provided at the rotation center of the rotary table to position the work with reference to the lower surface of the work, but when the positioning center of the work is arranged only on the rotary table side, , By rotating operation of the rotary table,
There is a limit to rotating the workpiece with high precision without rotating.

Conventionally, when it is necessary to lift and work a work, the work is lifted by a predetermined oil pressure, and the self-weight of the work and the working pressure are supported by the oil pressure. To raise the work and the table. Therefore, for example, when an attempt is made to position the upper surface of the work, this excessive hydraulic pressure rise acts on the work, causing inconvenience such as giving a distortion to the work.

The present invention is to solve the above-mentioned conventional problems, and it is possible to accurately position the center of a workpiece having a processing position on a concentric circle around a positioning hole, and to efficiently and accurately determine a processing position. It is still another object of the present invention to provide a work supporting apparatus capable of performing strong clamping with a relatively small force without excessively increasing a clamping pressure when clamping a work.

[Means for solving the problem]

The work support device according to the present invention is a work support device having coaxial positioning holes on upper and lower surfaces, and supporting a work having a plurality of processing positions on concentric circles centered on the positioning holes, A rotary table that performs indexing rotation at predetermined angles, a lower locating pin that is driven up and down at the center of rotation of the rotary table to be fitted into a positioning hole on the lower surface of the work, and moves up and down together with the lower locating pin to move the lower surface of the work. A press positioning portion that presses upward, an upper positioning portion that faces the upper side of the work that is opposed to above the rotary table and that is pressed upward by the press positioning portion, and a positioning hole on the upper surface of the work that is pressed upward fits. Upper locating pin is provided, and the rotation center of the rotary table is at an eccentric position with respect to a tool provided in the processing head. And it is characterized in that it is location.

Further, in the above means, a hydraulic drive unit for raising and lowering the lower locating pin and the pressing and positioning unit is provided, and the lower locating pin and the pressing and positioning unit are raised in the oil supply path for supplying hydraulic pressure for raising to the hydraulic driving unit. And a one-way valve disposed in a path connecting the front and rear of the valve to prevent oil from returning from the hydraulic drive unit side.

[Action]

In the above means, the lower locating pin which rises on the rotary table is inserted into the positioning hole formed on the lower surface of the work, is positioned by the pressing positioning part which rises with this, and the work is lifted by the pressing positioning part. The upper surface of the work is pressed against the upper positioning portion facing the rotary table, and the work is positioned from the upper surface by the upper locating pin on the upper surface of the work. In the processing operation, the position to be processed is moved to a position facing the tool by rotating the rotary table. Further, the processing depth by the tool can be tracked with reference to the upper positioning portion.

In addition, the oil supply path supplied to the hydraulic drive unit that raises the lower locating pin and the press positioning unit is shut off by a valve after completion of the lifting, and the one-way valve provided in parallel with this valve prevents movement of oil in the return direction. Therefore, even if the lower locating pin or the like is raised and the work weight of the work and the processing pressure of the tool from above are applied after the lower locating pin or the like is applied, the work can be firmly supported from below by preventing oil return in the oil supply path. . Therefore, it is not necessary to apply an excessively high hydraulic pressure when lifting the work, and the inconvenience of causing the work to be distorted is eliminated.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a boring machine provided with a work supporting device according to the present invention, and FIG. 2 is a right side view thereof.

1 and 2, reference numeral 1 denotes a base of a boring machine. A column 2 that moves in the Y direction is provided on the base 1. A saddle 3 that moves in the Z direction is provided on the front surface (the left side surface in FIG. 2) of the column 2, and a spindle head 4 as a processing head is provided on the saddle 3. The 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, a blade Ta is provided at the tip of a boring bar as a tool T so as to protrude and retreat laterally.

As shown in FIGS. 1 and 2, a turntable (index table) 10 is provided on the base 1. The rotation table 10 is indexed by NC control. On the rotary table 10, a lower holder 11
Further, an upper holder 12 located at the upper end thereof is provided. Also, a pair of support side plates 13 are provided on the upper end of the lower holder 11.
Are fixed, and an upper base 14 provided on the upper surface of the support side plate 13 is provided. 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, the lower holder 11 and the upper holder 12 are fixed by bolts 15. A piston 16 is inserted between the lower holder 11 and the upper holder 12 so as to be able to move up and down. This piston 16 is provided at the center of rotation 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 10 is eccentric to the left side of the figure with respect to the axial position of the tool T. And the lower surface of the flange 16a of the piston 16, the pressure chamber P ₁ for rise between the bottom cover 17 of the lower holder 11 is formed, for lowering between the upper surface and the lower surface of the upper holder 12 of the flange 16a pressure chamber P ₂ is formed. The pressure chamber P ₁ for increased hydraulic pressure supplied from the port 18a, by the pressure, the piston 16 rises. The pressure chamber P ₂ for falling port 18b are communicated. The piston 16 by application of pressure to the pressure chamber P ₂ is lowered. As shown in FIG. 2, a rotary joint 19 is provided in the rotary table 10, and
The ports 18a and 18b shown in the figure are connected to the hydraulic circuit shown in FIG. Reference numerals 20a, 20b, 20c, and 20d shown in FIG. 4 are oil seal rings.

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

FIG. 5 is an enlarged plan view of the upper base 14 above,
FIG. 6 is a sectional view thereof. A shaft member 22 is embedded in the center of the lower surface of the upper base 14, an upper positioning surface 22a is formed on the lower surface of the shaft member 22, and an upper locating pin 22b protruding downward is formed in the center of the upper positioning surface 22a.
Are formed. The 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 port 14a that communicates with the space A through the air nozzle 22c. ing. An air nozzle 2 is supplied from an air supply unit (not shown) through the air port 14a and the space A.
Air of a predetermined pressure is jetted downward from 2c. When the upper surface of the work W rises and comes into close contact with the upper positioning surface 22a, the air nozzle 22c is closed, and the rise in pressure in the air nozzle 22c, the space A and the air port 14a at this time is detected, and the work W It is detected that the positioning of the upper surface has been completed, that is, the clamping has been completed. Further, the upper base 14 is provided with a circle 5 around the upper locating pin 22b.
A tool insertion hole 14b is formed at a location.

Further, 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 the discharge pressing member 23.
24 is slidably inserted into the upper base 14. The discharge pressing member 23 is urged downward by a spring 25. In FIG. 6, the upper surface of the work W indicated by a dashed line is in close contact with the upper positioning surface 22a. At this time, the discharge pressing member 23 is pressed against the upper surface of the work W and retreats upward against the spring 25. I have. When releasing the clamp,
When the lifting force of the work W is removed, the spring
The urging force of 25 causes the discharge pressing member 23 to press the work W downward, and the urging force moves the work W to the upper locating pin.
When the workpiece W comes out of 22b, the close contact between the work W and the upper positioning surface 22a is released.

As shown in FIG. 3 and FIG.
A work supply guide is provided on the inner surface facing the. The work supply guide includes a lower guide 31 and an upper guide 32. As shown in FIG. 3, the lower guide 31 is
And a guide surface 31b that guides the lower side surface of the work W. When the piston 16 is lowered, the upper end surface of the lower locate pin 16c retreats below the guide surface 31a. As shown in FIG. 4, the lower guide 31 extends laterally from an upper position such as the lower locate pin 16c. The upper guide 32 is shorter than the lower guide 31, and has a guide surface 32a for guiding both side surfaces of the work W as shown in FIG. Further, as shown in FIG. 4, a work pusher 33 is provided at a substantially intermediate height between the lower guide 31 and the upper guide 32.
Are facing each other. The work pusher 33 is held by a rod 34, and this rod 34 is driven leftward in FIG. 4 by a cylinder mechanism (not shown). At the time of this driving, the work W is pushed to the left in FIG. 4 by the work pusher 33.

Next, the detection mechanism provided at the lower part will be described.

As shown in FIG. 4, the lower holder 11 has the piston
A detection bar 41 extending perpendicular to 16 is inserted. The detection bar 41 moves forward and backward when the large diameter portion 42 slides in the hole 11a. The tip 41a of the detection bar 41 is R
The tip 41a faces the outer periphery of the piston 16. The detection bar 41 is urged by a spring 43 in a direction in which the tip 41a is pressed against the piston 16. Also at the rear end 41b of the detection bar 41 is opposed proximity switch S _1. The proximity switch S ₁ is the magnetic detection method for example, when the rear end 41b of the detection bar 41 approaches the proximity switch S _1, which is detected. Piston 16 has a small diameter section
16d is formed. In FIG. 4, the piston 16 is raised, but when the piston 16 is raised to the uppermost part, at the moment when the tip 41a of the detection bar 41 is displaced from the lower end of the small diameter part 16d and moves to the large diameter part. and movement detection bar 41 is the rightward direction of FIG. 4, which is detected by the proximity switch S _1.
Thus, 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 shifts from the upper end of the small-diameter portion 16d to the large-diameter portion, and the detection bar 41 is pushed rightward in the drawing. 41b the piston 16 is detected by the proximity switch S ₁ is being detected that reaches 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. The detection lever 45 is for detecting the loading of the work 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 has an R shape. Structure of the workpiece W will be described later, the recess W ₁ is formed in the bottom of the right side in FIG. 4 of the workpiece W. The work W slides on the lower guide 31 and is sent in, and the recess W ₁
Is fitted to 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 45
b is close to the proximity switch S _2, a work loading is detected. Workpiece W is discharged to the left of FIG. 4, or the workpiece W is lifted by pressing the positioning surface 16b of the piston 16 the upper end, the recess W ₁ is separated from the tip of the detection lever 45. At this time, the detection lever 45 rotates clockwise as indicated by a chain line by its own weight or by the urging force of a spring, and the rear end 45b of the detection lever 45 moves away from the proximity switch 45b. As a result, the ejection of the work or the detection of the ascending positioning state is performed.

Further, as shown in FIG. 4, a cover 47 is provided on a side surface of the lower holder 11. The cover 47 is provided so as to be inclined, so that chips and coolant during processing can easily flow along the inclined surface. The upper surfaces of the lower holder 11 and the upper holder 12 are also inclined surfaces, so that chips and coolant can easily flow.

FIG. 7 shows a hydraulic circuit for moving the piston 16 up and down. In this embodiment, a mechanism other than the piston 16 is also hydraulically driven, but in FIG.
Only the hydraulic supply path to the drive unit is shown, and other hydraulic supply paths are omitted.

In FIG. 7, reference numeral 51 denotes a hydraulic pressure supply unit. Pump 52
The hydraulic pressure pressurized by is connected to the electromagnetic switching valve 56 via the paths 53, 54, 55. The path (tank port) on the negative pressure side is connected to the electromagnetic switching valve 56 via 57, 58, 59. The switching of the electromagnetic switching valve 56 switches the pressurized hydraulic path. One path extending from the electromagnetic switching valve 56 is connected to an electromagnetic shut-off valve 62 via 61. It is communicated with the port 18a to the pressurizing chamber P ₁ for the rise in Figure 4 by further passage 63. The other path 64 extending from the electromagnetic shut-off valve 62 corresponds to the port 18 in FIG.
communicates with the pressure chamber P ₂ for falling b. From In addition, a path between the paths 61 and 63 before and after the electromagnetic shut-off valve 62 is connected via a check valve 65. The check valve 65 is a one-way valve that permits movement of oil in the direction of the arrow in FIG. 7 and prevents movement in the direction opposite to the direction of the arrow. An adjusting valve 66 is provided between the two paths 61 and 64 on the output side from the electromagnetic switching valve 56.

Next, the structure of the work loaded in the upper work support device will be described.

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

This work W is a case of a compressor of a vehicle air conditioner. This work W consists of a lower piece Wa and an upper piece Wb
The two pieces are joined together in the state shown in FIG.
At the bottom right end of the lower piece Wa shown in the figure, the detection lever 45
It is formed with a recess W ₁ to operate the. Also lower piece
Positioning the central portion of the bottom surface of Wa hole W ₂ Kamata upper piece Wb
The central portion of the upper surface of the positioning hole W ₃ are formed. Positioning holes W ₂ and W ₃ of the upper and lower are located coaxially. A plurality of holes on a circumference further around the respective positioning holes W ₂ and W ₃
W ₄ is formed. This hole W ₄ are formed through the upper piece Wb and the lower piece Wa, the inner surface of the hole W ₄ is the work position in the present embodiment.

 Next, the processing operation will be described.

When the supply of the workpiece W, the hydraulic pressure supply switching will be described later, the pressure chamber P ₂ of the upper of FIG. 4 is pressurized, also pressurizing chamber P ₁ of the lower side becomes the tank port pressure, the piston 16 is lowered, The upper part thereof has moved below the guide surface 31a of the lower guide 31 on the upper end surface of the lower locate pin 16c.

The work W is installed in a portion of the lower guide 31 extending to the left side in FIG. 4, and the work W is pushed to the right in FIG. 4 manually or by an automatic operation such as cylinder pressure. In the state where the lower surface of the work W is guided by the guide surface 31a and the side surface of the work is guided by the guide surface 31b,
It is pushed into a position above the piston 16. When the work W is completely pushed in, the concave portion W ₁ (see FIG. 9) of the bottom edge of the lower piece Wa of the work W hits the tip 45a of the detection lever 45 shown in FIG. 4, and the detection lever 45 is shown by a solid line. As described above. With this rotation, the detection lever
Rear 45b of 45 is detected in proximity to proximity switch S _2, thereby the workpiece W is securely inserted is detected.

When the workpiece W is fully inserted, by switching the hydraulic pressure path, Fig. 4 below the pressure chamber P ₁ of pressurized, the pressure chamber P ₂ of the upper is reduced to tank port pressure. Therefore, the piston 16 is driven to rise. Upper part of the lower locating pin 16c of the rising piston 16 is fitted into the positioning hole W ₂ of the bottom piece Wa of the workpiece W, also pressing the positioning surface 16b hits the lower surface of the lower piece Wa. As the piston 16 rises, the work W is lifted by the pressing and positioning surface 16b and separates from the guide surface 31a of the lower guide 31. The positioning holes W ₂ of the upper surface of the upper piece Wb of the workpiece W, is fitted to the upper locating pin 22b shown in FIG. 6 also has an upper surface of the upper piece Wb corresponds to the upper positioning surface 22a. Then, in a state where the workpiece W is sandwiched between the pressing positioning surface 16b and the upper positioning surface 22a,
Moreover the positioning hole W ₂ and W ₃ of the upper and lower workpiece W is fitted to the upper and lower locating pin 16c and 22b, it is positioned from above and below the axis. At this time, the discharge pressing member 23 shown in FIG. 6 is pressed against the upper surface of the work W, and rises against the urging force of the spring 25.

After the work W has been clamped, the turntable 10
Rotated by the NC control motor, the lower holder 11, the upper holder 12, the support side plate 13 and the upper base 14 are integrally rotated by a predetermined angle about the axes of the locate pins 16c and 22b. Thus, the position of the workpiece W to be processed is determined. In a state where the workpiece W is clamped, with each hole W ₄ which is the work position of the workpiece W, and a tool insertion hole 14b of the upper base 14 shown in FIG. 5 is positioned coaxially, the turntable 10 NC by the rotation of the control, the hole W ₄ of each tool insertion hole 14b and the work 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 descends, and the spindle head 4 descends. In this state, the blade Ta at the lower end of the tool T shown in FIG. 4 has retreated in the radial direction. This tool T is the tool insertion hole 14 of the upper base 14
b is inserted into the hole W ₄ of the workpiece W from the projecting edge Ta is laterally spindle head 4 is rotated, and finishing of the inner peripheral surface of the hole W ₄ Ruru performed. In the case of the work W shown in FIGS. 8 and 9, it is assumed that the lower piece Wa and the upper piece Wb are joined together. Also it assumes the boring of holes W _4, hole W ₄ of the upper piece Wb and the lower piece Wa by the tool T is boring simultaneously. Chips and coolant that time flows downward from the hole W _4, flows along the inclined surface of the inclined surface and the cover 47 of the upper holder 12 and lower holder 11.

When machining of the hole W ₄ of one place is completed, the blade Ta is regressed tool T, the tool T is withdrawn upward spindle head 4 is increased. Then the turntable 10 is rotated to the next processing position i.e. adjacent holes W ₄ and tool insertion hole 14b is machining operation moves to the lower side of the tool T is performed.

When all holes W ₄ of the processing is completed tool T is moved away from the workpiece W and the upper base 14, the pressure chamber P ₂ of the upper shown in FIG. 4 by the hydraulic pressure switchover is pressurized, the piston 16 is lowered. When the pressing positioning surface 16b formed in the piston 16 is lowered, falling workpiece W with this, the positioning hole W ₃ of the upper surface of the workpiece W is removed from the upper locating pin 22b.
At this time, since the discharge pressure member 23 shown in FIG. 6 to press the workpiece W downward by the urging force of the spring 25, positioning holes W ₃ of the upper portion of the workpiece W can escape reliably from the upper locating pin 22b. When the work W is lowered to a position where it comes into contact with the guide surface 31a of the lower guide 31, the piston 1
Lower locating pin 16c by the lowering of the 6 exits from the hole W ₂ of the lower surface of the workpiece W. The lowered work W is pushed by the work pusher 33 shown in FIG. 4, 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 the detection operation of whether or not the work W is clamped by rising, first, the piston 16 is raised and lowered by moving the tip 41a of the detection bar 41 shown in FIG. off the large-diameter portion, the detection bar 41 is moved in the right direction in the figure, which is confirmed by being detected by the proximity switch S _1. Whether the insertion of the work is completed depends on whether the detection lever 45 is in the solid line state or the chain line state in FIG.
Alternatively, it is detected whether the workpiece W has been ejected or whether the work W has been raised for clamping. Further, the work W comes into close contact with the upper positioning surface 22a shown in FIG.
When the air nozzle 22c is closed and the pressure in the air port 14a increases, it is detected that the work W is securely clamped.

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

When the work clamp operation is performed by raising the piston 16, the electromagnetic switching valve 56 is switched to the side (a), and the electromagnetic shutoff valve 62 is switched to the state (c). The hydraulic pressure supplied by the hydraulic pump 52 of the hydraulic pressure supply unit 51 is transmitted through paths 53, 54, 55,
(A), 61, through (c), 63, is supplied from the port 18a shown in Figure 4 into the compression chamber P _1, the piston 16 is raised.
When the clamping is completed, the electromagnetic shut-off valve 62 is switched to (d). As a result, the paths 61 and 63 are cut off. Also,
In the check valve 65 using a one-way valve, when a leak occurs in the extension path of the path 63 (for example, a leak from the seal portion of the pressurizing chamber occurs), the oil flows from the path 61 to the 63 when the oil pressure decreases. Can move, but cannot move in the opposite direction. Since the electromagnetic shutoff valve 56 is switched and the check valve 65 is provided in this way, even if the weight of the work W and the pressing force of the tool T act on the piston 16, the hydraulic pressure returns in the direction of the path 55. Is prevented and the piston 16
Can be prevented from falling. That is, at the time of the clamping operation, by switching the electromagnetic shut-off valve 62 to (c), the piston 16 can be raised without applying an excessive pressure to clamp the work W. By switching 62 to (d) to prevent the hydraulic pressure from returning, the supporting pressure of the work W can be substantially increased.

Next, when releasing the clamp, the electromagnetic shutoff valve 62 is switched to (c), and the electromagnetic switching valve 56 is switched to (b). As a result, the path 55 is switched to the 64 side, and the path 59 is switched to the path 64 side. And the pressing force by the pump 52 is
From the path 64 is supplied to the pressure chamber P ₂ of FIG. 4, the piston 16 is lowered.

Further, the adjustment valve indicated by reference numeral 66 controls the hydraulic pressure of the paths 53, 54, 55,
The pressure is adjusted to the oil pressure of the paths 61 and 63 necessary for the clamping operation.

In the illustrated embodiment, while indicating compressor case there are holes W ₄ on the circumference as an example of the work W, a plurality of workpiece positions are provided on the circumference around the positioning hole Any work may be used.

〔effect〕

As described above, according to the first aspect of the present invention, the work position is determined by rotating the work around the positioning hole, and the work is performed by the tool. Therefore, the work position of the work can be efficiently determined. Done. In addition, the work is pushed up by the pressing positioning surface and is positioned coaxially by the upper and lower locate pins, so that the rotation center axis of the work is reliably positioned from above and below, and the rotation of the work for determining the work position of the work is performed. Elimination of center axis deviation enables high-precision indexing. Furthermore, the work is pushed up by the pressing positioning surface and is pressed and positioned by the upper positioning surface located above, so that the size of the processing position of the tool which starts processing from above can be tracked with reference to the upper surface of the work, and the processing can be performed. Depth positioning can be performed with high accuracy.

According to the second aspect of the present invention, when raising the lower locating pin and the pressing positioning surface, the work clamp can be performed with a relatively small force without requiring an excessively high hydraulic pressure enough to cause distortion of the work. Can strongly receive the work's own weight and the processing pressure of the tool on the work.

[Brief description of the drawings]

1 is a front view of a boring machine equipped with a work supporting device according to the present invention, FIG. 2 is a right side view thereof, FIG. 3 is a partially enlarged front view of FIG. 4
3 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. 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, 16… Piston, 16b… Pressing positioning surface, 16c
... lower locating pin, 22 ... shaft member, 22a ... upper positioning surface, 22b ... upper locating pin, 31 ... lower guide, 32 ... upper guide, 52 ... pressurizing pump, 56 ... electromagnetic switching valve, 62 ... electromagnetic shutoff valve, 65 ... Check valve (one-way valve).

Claims (2)

(57) [Claims] 1. A work supporting apparatus having a coaxial positioning hole on upper and lower surfaces and supporting a plurality of processing positions on a concentric circle centered on the positioning hole, the work supporting device comprising: A rotary table that performs indexing rotation, a lower locating pin that is driven up and down at the center of rotation of the rotary table to be fitted into a positioning hole on the lower surface of the work, and that moves up and down together with the lower locating pin to press the lower surface of the work upward. A press positioning portion, an upper positioning portion facing above the rotary table and contacting the upper surface of the work pressed upward by the press positioning portion, and an upper portion in which a positioning hole of the upper surface of the work pressed upward is fitted. A locating pin is provided, and a rotation center of the rotary table is disposed at an eccentric position with respect to a tool provided on the processing head. Work supporting device, wherein 2. A hydraulic drive unit for raising and lowering the lower locating pin and the pressing and positioning unit is provided, and the lower locating pin and the pressing and positioning unit are raised in an oil feed path for supplying hydraulic pressure for raising to the hydraulic driving unit. 2. The work supporting device according to claim 1, further comprising a valve that shuts off an oil feed path later, and a one-way valve that is disposed in a path connecting the front and rear of the valve and that prevents oil from returning from the hydraulic drive unit side.