JPH07255B2 - Work fixing jig - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work fixing jig installed on a table of a machine tool.

[Prior Art] In recent years, there has been a marked tendency toward high-mix low-volume production, and even in the field of machine tool machining, continuous machining of many types of workpieces is required to achieve unmanned operation. For this reason, in the past, work fixing jigs that exclusively fix various works were mounted on each of multiple pallets, and the work was supplied to the table of the machine tool together with the pallets, and machining was predicted. A work fixing jig is manufactured so that several kinds of works can be attached, the work fixing jig is mounted on a pallet, and the work is supplied to the table of the machine tool together with the pallet. Alternatively, by installing the work fixing jig on the table of the machine tool and supplying the work to the work fixing jig by a robot or the like, many kinds of works can be unmanned on the machine tool table. It could be installed.

[Problems to be Solved by the Invention] However, in the method of supplying the work together with the pallet to the machine tool, (a) it is necessary to prepare a wide space in order to continuously supply a large number of pallets. (B) The equipment cost increases because a large number of pallets and jigs for fixing works must be prepared. (C) Since the jigs for fixing works and the works are attached to the pallet, The weight at the time of replacement increases, and the device for transporting and replacing pallets becomes large,
From this point as well, there is a drawback that the equipment cost increases.

On the other hand, the method of mounting the work fixing jig on the pallet has the same drawbacks as the above (a) to (c), and (d) when fixing a work other than the one predicted at the beginning. Has to manufacture a new jig for fixing the work, and it is not possible to quickly respond to changes in the shape of the work, and it costs a lot each time the shape of the work is changed. There is.

Further, the method of installing the work fixing jig on the table of the machine tool also has the same drawbacks as the above (d).

The present invention has been made in view of the above circumstances, and it is possible to unmannedly install many types of workpieces on a table of a machine tool without requiring a large space and with a small equipment cost, and it is not possible to predict. The objective is to provide a work fixing jig that can quickly and quickly handle work of various shapes at a low cost.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a jig main body having a plurality of member mounting portions and installed on a table of a machine tool, and at least one of the jig main bodies. And a work fixing mechanism for fixing the work to the jig main body. The work fixing mechanism fixes the work to the member mounting portion provided with the work fixing mechanism. Is provided with a work attachment member installation section for detachably installing the work attachment member, and the other member attachment section of the jig body is provided with a work attachment member storage section for detachably storing the work attachment member. It is what has been.

[Operation] In the present invention, according to the shape of the mounting portion of the work,
The work attachment member is taken out from the work attachment member storage portion and installed in the work attachment member installation portion.

Further, when workpieces of different shapes are supplied, the workpiece attachment members of different shapes are taken out from the workpiece attachment member installation section and stored in the workpiece attachment member storage section, and the workpieces of different shapes The mounting member is taken out from the work mounting member storage portion and installed in the work mounting member installation portion having the different shape.

Therefore, the work can be supplied to the work attachment member installation portion by a work supply means such as a robot, and when the work has a different shape of the attachment portion, the work can be supplied by the gripping means such as a robot. The work attachment member of the attachment member installation portion can be replaced with that of the work attachment member storage portion so as to match the shape of the attachment portion of the work.

Therefore, many kinds of works can be installed unmanned at the jig body, that is, at the processing position of the machine tool.

[Embodiment] An embodiment in which the present invention is applied to a machining center will be described below with reference to FIGS. 1 to 9.

In FIG. 1, reference numeral 1 is a table of a machining center, and this table 1 can be turned around a shaft center by a table indexing mechanism (not shown). And
A jig body 2 is placed on the table 1.

The jig body 2 is composed of a bottom plate 3 placed on the table 1 and a side wall portion 4 standing upright on the bottom plate 3.

The side wall portion 4 includes a pair of horizontal plates 5 arranged in parallel on the bottom plate 3.
And the rear plate 6 connecting the rear side edge portions 5a, 5a of the horizontal plates 5 and the front side edge portions 5b, 5b of the left and right horizontal plates 5 to each other. It has a plurality of member mounting portions constituted by the front plate 7 having a width wider than the dimension between the outer side surfaces. The jig body 2 is integrally formed by welding the bottom plate 3, the lateral plate 5, the rear side 6 and the front plate 7.

The jig body 2 thus formed has the bottom plate 3 fixed to the table 1 with bolts (not shown) while being placed on the upper surface of the table 1. Then, the outer surfaces of the left and right lateral plates 5 and the front plate 7 are machined by a machining center having the table 1 in a state where the jig body 2 is fixed on the table 1 to machine the lateral plates 5. The surface 5c is formed, and the machined surface 7a is formed on the front plate 7, whereby the verticality of the horizontal plate 5 and the front plate 7 with respect to the upper surface of the table 1 is improved.

Further, on the machined surface 7a of the front plate 7, a work setting block (positioning member setting part) 8 for setting a work is provided.
Are fixed by bolts (not shown).

The work setting block 8 is formed by a quadrangular thick plate, and the front surface 8a and the rear surface 8b in the thickness direction are accurately processed in parallel. A support hole 8c for supporting a seating surface positioning member 27 and a vertical positioning member 28, which will be described later, is formed in the front surface 8a of the work setting block 8.

The support hole 8c has a circular cross section and is formed perpendicular to the front surface 8a.

As shown in FIG. 2, a cylinder hole 8d is formed in the center of the work setting block 8 in parallel with the table 1 and in parallel with the rear surface 8b of the work setting block 8.

The cylinder hole 8d is formed at a predetermined depth from the end surface 8e on the right side of the work setting block 8 in the figure, and on the left side of the cylinder hole 8d, the axis is aligned with the cylinder hole 8d and the small diameter. Is formed with a rod insertion hole 8f. Further, a piston 9 is fitted in the cylinder hole 8d so as to be movable in the axial direction, and a blind plug is provided at an opening end portion on the right side of the cylinder hole 8d.
10 is fitted and fixed. The blind plug 10 is configured to close the head side of the cylinder hole 8d.

On the other hand, a piston rod 11 connected to the piston 9 is inserted through the rod insertion hole 8f so as to be axially movable.
At the intermediate position of the inner peripheral surface of the rod insertion hole 8f, the inner diameter is expanded to form a grease reservoir 8g. The tip end of the piston rod 11 is projected from the left end surface 8h of the work setting block 8 in the figure and is connected to the side clamper block 13 supported by the guide block 12.

The guide block 12 is a square thick plate having a dovetail groove 12a formed therein, and the center line of the dovetail groove 12a is aligned with the axial center of the piston rod 11 so that the machined surface 7a of the front plate 7 is formed. It is fixed with a bolt (not shown).

The side clamper block 13 is formed in a quadrangular prism shape, has its longitudinal direction oriented in a direction orthogonal to the table 1, and has one outer peripheral surface facing the machined surface 7a of the front plate 7 in parallel. The guide block 12 is supported by the guide block 12, and the guide block 12 is provided on the outer surface facing the machined surface 7a.
Dovetail-shaped protrusion 13a that fits precisely into the dovetail groove 12a
Are formed. In addition, the side clamper block 13
At equal intervals in the longitudinal direction (direction orthogonal to the drawing).
One overhead clamper cylinder hole 13b is formed.

The cylinder hole 13b is formed at a predetermined depth from the front surface 13c of the side clamper block 13, and the overhead clamper piston 14 is axially movably fitted into the cylinder hole 13b. The piston 14 has a front
An overhead clamper piston rod 15 protruding from 13c to the front side is connected by a bolt 16.

In addition, the piston rod 15
A rod cover 17 is provided for closing the opening of the cylinder hole 13b by inserting the rod cover 17 therethrough. Also the piston rod
An overhead clamper support portion 19 for detachably supporting the overhead clamper 18 is integrally formed at the tip of the 15.

As shown in FIGS. 2 to 3, the overhead clamper support portion 19 is formed so that one surface of a rectangular parallelepiped is orthogonal to the axial center of the piston rod 15, and has a tip surface 19.
A T-shaped groove 19b whose inside is enlarged in a rectangular shape is formed in a so as to penetrate from one side surface to the other side surface. Further, in the overhead clamper support portion 19, a ball plunger 20 is screwed and embedded in the bottom surface portion of the T groove 19b.

The ball plunger 20 is one in which a part of a steel ball 21 is urged by a spring 22 and protrudes from one end of a cylindrical body whose outer periphery is threaded, and is attached to the overhead clamper support portion 19. A part of the steel ball 21 is biased by the spring 22 and protrudes from the bottom surface of the T groove 19b. The ball plunger 20 is also provided in the work setting block 8 so that a part of the steel ball 21 projects from the inner peripheral surface of the support hole 8c.

Further, the overhead clamper 18 is a rectangular plate-shaped body having a bulging portion formed in the vicinity of the tip portion and bulging in a rectangular parallelepiped shape, and the base end portion 18a thereof is the overhead clamper supporting portion 19. It is formed so as to fit into a rectangularly enlarged portion of the T groove 19b of the base end portion 18 and
The tip side of a is increased in thickness through the step portion 18b, and the tip side is bulged in a rectangular parallelepiped shape as described above, and this bulged portion serves as a grasped portion 18c of the overhead clamper 18. Further, the base end portion 18a is provided with a T-shaped groove 19b on the bottom surface 18d of the base end portion 18a.
Step 18b is inserted into the overhead clamper support 1
In the state of abutting against the side surface of 9, the conical recess into which the steel ball 21 is fitted is located at the position of the steel ball 21 of the ball plunger 20.
18e is formed. On the other hand, the side surfaces 18f, 1 of the grasped portion 18c
A gripping groove 18g extending parallel to the longitudinal direction of the overhead clamper 18 is formed in 8f, and a conical positioning hole 18i is formed in the center of the upper surface 18h of the gripped portion 18c. .

Further, on the front surface 13c of the side clamper block 13,
A rotation preventing member 23 is provided in contact with the exposed side surface of the T groove 19b of the overhead clamper supporting portion 19 to maintain the direction of the T groove 19b in a direction parallel to the upper surface of the table 1, and the side clamp block 13 is provided. Work setting block 8
A pressing member 24 (see FIG. 2) for contacting the work W supplied to the work setting block 8 and pressing the work to the right side in the drawing is provided on the side surface on the side.

On the right side of the work setting block 8 in the drawing, as shown in FIG. 2, a side support block 25 is provided so as to face the side clamper block 13 in parallel.

The side support block 25 is formed in a quadrangular prism shape, and its longitudinal direction is oriented in a direction orthogonal to the table,
The side surface on the left side in the figure is the end surface 8e on the right side of the work setting block 8.
Is fixed to the machined surface 7a of the front plate 7 with a bolt (not shown).

The side support block 25 includes two upper and lower parts in the longitudinal direction.
A cylinder mechanism is formed at the position, and the same piston rod 15 as that provided on the side clamper block 13 is extendably extended from the front surface 25a of the side support block 25.

An overhead clamper 18 is attached to the overhead clamper support portion 19 at the tip of the piston rod 15.

Further, on the front surface 25a of the side support block 25, a rotation preventing member for maintaining the direction of the T groove 19b of the overhead clamper support portion 19 in a direction parallel to the upper surface of the table 1.
23 are provided.

Furthermore, the side support block 25 has a dovetail groove 25c extending from the front surface 25a in a direction orthogonal to the machined surface 7a of the front plate 7 on the side surface 25b on the side facing the side clamper block 13.
Are formed.

The dovetail groove 25c is provided with a ball plunger 20 at the center of the bottom surface in the width direction and near the front surface 25a such that a part of the steel ball 21 projects from the bottom surface.

Further, a receiving metal fitting 26 for holding the work W pressed by the pressing member 24 of the side clamper block 13 is slidably fitted in the dovetail groove 25c.

The work setting block 8, a cylinder mechanism including a piston rod 11 provided therein, a guide block 12, a side clamper block 13, and a piston rod provided therein.
A cylinder mechanism including 15 and a side support block 25 and a cylinder mechanism including the piston rod 15 provided on the side support block 25 actuate a work attaching member described later to move the work W to the jig body 2
And an overhead clamper support portion 1 provided on the support hole 18c of the work setting block 8 and the piston rod 15 of the cylinder mechanism.
9. The dovetail groove 25c of the side support block 25 and the like constitute a work mounting member installation portion for removably installing a work mounting member, which will be described later, on the work fixing mechanism.

As shown in FIGS. 1 and 2, the receiving metal fitting 26 is a dovetail-shaped protrusion that slidably fits into the dovetail groove 25c of the side support block 25 on one surface of a rectangular plate-shaped body. 26a
Is formed, the protrusion 26b is formed at the center of the other surface,
The gripped portion 26c of the receiving metal fitting 26 is formed on the end surface in the direction orthogonal to the sliding direction of the dovetail groove 25c.

The gripped portion 26c is formed in the same shape as the gripped portion 18c of the overhead clamper 18. Then, on the bottom surface of the dovetail-shaped protrusion 26a, the protrusion 26a
Is fitted into the dovetail groove 25c and the receiving metal fitting 26 is brought into contact with the front surface 8a of the work setting block 8, a part of the steel ball 21 is fitted into the position of the steel ball 21 of the ball plunger 20. A conical recess 26d is formed.

In addition, a support hole 8c formed in the work setting block 8
A seat surface positioning member 27 serving as a reference seat for the work W supplied to the work setting block 8 and a vertical positioning member 28 for vertically positioning the work W are fitted and installed. There is.

As shown in FIG. 4, the seating surface positioning member 27 is formed by forming a grasped portion 27a that bulges into a rectangular column shape in the vicinity of one end of a cylinder, and a cylinder portion 27b on one end side of the grasped portion 27a. Has a seat surface 27c orthogonal to the axis, and the gripped portion 27a
A cylindrical portion 27d on the other end side is formed so as to be precisely fitted into the support hole 8c. Then, a conical positioning hole 27e is formed at the center of the bearing surface 27c of the columnar portion 27b on the one end side, and the columnar portion 2d is formed on the columnar portion 27d on the other end side.
7d is inserted into the support hole 8c and the gripped portion 27a is brought into contact with the front surface 8a of the work setting block 8, and a part of the steel ball 21 is fitted into the position of the steel ball 21 of the ball plunger 20. A full conical recess 27h is formed. Further, a conical chamfered surface 27f is formed on the outer periphery of the tip end of the columnar portion 27d on the other end side. In addition, the gripped portion 27a includes a space between upper and lower side surfaces and a grip groove 27 formed on the side surfaces.
The width and depth of g are such that the portion to be gripped 1 of the overhead clamper 18
It has the same shape as that of 8c.

The seating surface positioning member 27 formed as described above,
A plurality of cylinders 27b on one end side having different heights from the gripped portion 27a to the seat surface 27c are manufactured.

On the other hand, as shown in FIG. 5, the vertical positioning member 28 has a small diameter cylindrical portion 28a having a diameter accurately fitted in the support hole 8c and an axial center aligned with one end side of the small diameter cylindrical portion 28a. It is formed integrally with a large diameter cylindrical portion 28b formed to have a larger diameter than the small diameter cylindrical portion 28a, and a conical positioning hole 28d is formed at the center of the end surface 28c of the large diameter cylindrical portion 28b. On the peripheral surface of the large-diameter cylindrical portion 28b, at a vertical position thereof, a gripping groove 28e formed in the same direction, width, and vertical interval as the gripping groove 18g formed in the gripped portion 18c of the overhead clamper 18 is formed.
Is provided. Further, on the outer peripheral surface of the small-diameter cylindrical portion 28a, the small-diameter cylindrical portion 28a is inserted into the support hole 8c, and the large-diameter cylindrical portion 28b is brought into contact with the front surface 8a of the work setting block 8 so that the ball plunger 20 A conical recess 28f into which a part of the steel ball 21 is fitted is formed at the position of the steel ball 21, and a conical chamfered surface 28g is formed on the outer periphery of the end of the small diameter cylindrical portion 28a.

As the vertical positioning member 28 formed as described above,
The large diameter cylindrical portion 28b having a different diameter, and the chamfered portion 28h (the vertical positioning member 2 shown in FIG.
8) are manufactured with different dimensions from the chamfered portion 28h to the shaft center.

The overhead clamper 18, the receiving metal fitting 26, the seat surface positioning member 27, the vertical positioning member 28, etc. are mounted on the work mounting member installation portion of the work fixing mechanism so as to directly contact the work W and position or clamp the work W. It constitutes a work attachment member that works as described above.

Further, as shown in FIGS. 1 and 2, the left and right lateral plates 5 and 5 have their respective machined surfaces 5c provided with an overhead clamper 18, a receiving metal fitting 26, a seating surface positioning member 27 and a vertical positioning member. A storage block (work mounting member storage section) 29 for storing 28 is provided.

The storage block 29 is formed of a flat thick plate, and the storage block 29 is fitted with a cylindrical portion 27d on the other end side of the seating surface positioning member 27 and a small diameter cylindrical portion 28a of the vertical positioning member 28. A holding hole 29a for holding together is formed, and an overhead clamper holding body 30 for holding the overhead clamper 18 and a receiving metal fitting holding body 31 for holding the receiving metal fitting 26 are provided.

Further, the machining center is provided with a handling tool 41 as a tool for gripping and moving the overhead clamper 18, the receiving metal fitting 26, the seat surface positioning member 27 and the vertical positioning member 28.

As shown in FIGS. 6 to 7, the handling tool 41 has a pull stud 42, a shank portion 43, and an ATC at the base end.
(Automatic tool changer) It is composed of a gripping part 44 and is usually stored in a tool magazine of a machining center (not shown).
It is adapted to be attached to the main shaft S by.

In addition, the diameter of the flange portion 4 with the enlarged diameter is provided on the tip side of the ATC grip portion 44.
5 is formed, and a cylindrical convex portion 45a whose axial center is aligned with the shank portion 43 is formed on the tip end surface of the flange portion 45. Then, at the tip of the flange portion 45, the convex portion 45a
A cylinder tube 46 is provided on the outer peripheral surface of which the inner peripheral surface is precisely fitted and the axis of which is aligned with the shank portion 43.

The cylinder tube 46 has a bulging portion 46a formed in the outer peripheral portion of the base end portion thereof, in which a part of the outer peripheral portion bulges in the radial direction. The bulging portion 46a has a bulging portion 46a. A flow path 46b is formed which communicates with the tip portion of the inner convex portion 45a. Further, in the bulging portion 46a, at a position facing the air supply hole H1 formed in the spindle housing H of the machining center, the flow passage 46b communicates with the side surface 46c on the spindle housing H side and the axis of the cylinder tube 46 is formed. An air communication hole 46d extending in parallel is formed. And the air communication hole 4
6d is provided with a connector 47 that connects the air supply hole H1 of the spindle housing H and the air communication hole 46d when the handling tool 41 is fastened to the spindle S.

The connector 47 is formed in a cylindrical shape, and a fitting cylinder portion 47a that fits into the air communication hole 46d of the bulging portion 46a is formed at the base end portion of the fitting cylinder portion 47a. A flange portion 47b is formed on the tip side. And this connector 4
7, the flange portion 47b is fixed by being connected to the bulging portion 46a with a bolt 48. Further, the tip surface 47c of the connector 47 is
With the handling tool 41 fastened to the spindle S, the end face H2 of the spindle housing H in which the air supply hole H1 is opened.
Is formed perpendicular to the axial center so as to press closely.

The cylinder tube 46 with the connector 47 fixed is
The parallel pin 50a is connected to the flange portion 45 of the ATC grip portion 44 by 49, and the parallel pin 50a driven from the cylinder tube 46 into the flange portion 45 prevents a shift around the axis of the ATC grip portion 44. There is.

A piston 51 is fitted in the cylinder tube 46 so as to be movable in the axial direction, and a piston rod 52 is connected to the piston 51 at the axial center of its tip end surface. The piston rod 52 has a conical sharp tip.

Further, a gripping member 53 is provided on the tip end side of the cylinder tube 46 so as to match the axis of the cylinder tube 46.

The gripping member 53 has a rectangular columnar prism portion 53b whose axial center is aligned with the columnar portion 53a, which is formed on the tip side of the columnar portion 53a. A gripping wall portion 53c extending parallel to the tip end side is formed, and gripping protrusions 53d projecting in a direction in which the tip end portions face each other are formed at the tip ends of the upper and lower gripping wall portions 53c. And
A flange portion 53e is formed at the base end portion of the columnar portion 53a, and the base end side of the flange portion 53e serves as a reference cylinder portion 53f that is precisely fitted to the cylinder tube 46.

Further, inside the cylindrical portion 53a, from the center portion in the longitudinal direction to the base end side, a large diameter hole portion 53g whose axis is aligned with the reference cylindrical portion 53f is formed, and the tip of this large diameter hole portion 53g. On the side, a small-diameter hole portion 53h is formed which has its axis aligned with the large-diameter hole portion 53g and penetrates to the tip side of the prismatic portion 53b.

Furthermore, the grip projection 53d is provided with the overhead clamper 1
8, holding metal fittings 26, seating surface positioning member 27 and vertical positioning member 28 gripping grooves 18g, 27g of a shape common to each,
It is formed so as to be engaged with 28e with a certain clearance (however, in FIG. 6, a state in which the seating surface positioning member 27 is gripped is shown).

Further, slide bearings 54 for slidably supporting the piston rod 52 in the axial direction are fitted and fixed to the base end portion and the tip end portion in the small diameter hole portion 53h.

The gripping member 53 configured as described above is the reference cylindrical portion 53f.
Is fitted to the inner peripheral surface of the cylinder tube 46, and the flange
53e is fixed to the cylinder tube 46 by connecting the cylinder tube 46 with the bolt 55. Further, the gripping member 53 is prevented from being displaced around the axial center with respect to the cylinder tube 46 by the parallel pin 50b driven into the cylinder tube 46 from the flange portion 53e of the gripping member 53. A coil spring in a state of being urged by the step portion 53i and the piston 51 is provided between the step portion 53i on the tip side of the large diameter hole portion 53g in the grip member 53 and the piston 51.
56 are provided.

Next, the operation of the device configured as described above will be described.

When different works W are supplied, information on the supplied works W (for example, as shown in (a) to (d) of FIG. 9), the height of the seat surface or the height of the clamp surface is determined by the work W. There are a variety of different heights, and these pieces of information are input to the computer of the machining center.) The overhead clamper 18, the receiving metal fitting 26, the seat surface positioning member 27, and the vertical positioning member 28 are stored in the storage block 29.
The work W can be mounted on the jig main body 2 by selecting from the above, and setting it on the overhead clamper supporting portion 19 or the work setting block 8.

In this case, first, the handling tool 41 stored in the tool magazine is installed on the spindle S by ATC. The table 1 is swung to orient the machined surface 7a of the front plate 7 of the jig body 2 in the direction orthogonal to the main axis S. And the previous work W
On the other hand, the parts of the overhead clamper 18, the receiving metal fitting 26, the seating surface positioning member 27, or the vertical positioning member 28 at different positions such as the height of the seating surface and the height of the clamp surface are grasped and taken out. Then turn table 1 left or right 90 °
By turning, the storage block 29 is oriented in the direction orthogonal to the main axis S, and the gripped component is stored in a predetermined position of the storage block 29 determined according to the component. At this position, the overhead clamper suitable for the size of the next work W
Parts such as 18 are grasped by the handling tool 41 and taken out from the storage block 29, and the table 1 is rotated by 90 ° again and the machined surface 7a of the front plate 7 is oriented in the direction orthogonal to the main axis S. Then, the grasped component is mounted on the overhead clamper support portion 19 or the like. By repeating the above operation, the next work W can be mounted.
Then, after the mounting becomes possible, the ATC moves the handling tool 41 from the spindle S to the tool magazine.

Also, with the handling tool 41, as shown in FIG.
For example, to grip the seating surface positioning member 27, the gripping protrusion 53d at the tip of the handling tool 41 is positioned to the side of the gripping groove 27g of the gripped portion 27a, and in this state, the gripping protrusion 53d.
The table 1 is moved in the left-right direction so that is fitted into the grip groove 27g. And, the air supply hole H1 of the spindle housing H
Air is discharged from the air and the air is used as a handling tool.
Supply to the head side of piston 51 in 41. Then,
The piston 51 moves to the tip side, and the tip of the piston rod 52 having a conical sharp end is fitted into the positioning hole 27e which is also formed in a conical shape. As a result, the seat surface positioning member 27
Is gripped by the grip projection 53d and the piston rod 52, and is aligned with the axis of the handling tool 41. Further, the position of the seat surface positioning member 27 in the front-rear direction with respect to the main axis S is determined by the position of the grip projection 53d.

Further, the seating surface positioning member 27 gripped as described above,
It is moved to the support hole 8c of the work setting block 8 by the operation of the spindle S or the table 1, and is inserted into or pulled out of the support hole 8c. And when inserted,
At the position where the gripped portion 27g contacts the front surface 8a of the work setting block 8, a conical recess 27h formed in the gripped portion 27 is formed.
The steel ball 21 of the ball plunger 20 is fitted in the bearing surface positioning member 27 and is securely held by the work setting block 8.
Further, even when it is inserted into the holding hole 29a of the storage block 29, it is surely held by the ball plunger 20 in the same manner. The vertical positioning member 28 is also inserted into the support hole 8c and the holding hole 29a in the same manner as described above, and is securely held by the ball plunger 20. However, in the case of the overhead clamper 18, when it is inserted into the overhead clamper support portion 19 or the overhead clamper holder 30, it is securely held by the ball plunger 20, and the receiving metal fitting 26 is inserted into the dovetail groove 25c. At the ball plunger 20
Is securely held by.

To remove the seating surface positioning member 27 from the handling tool 41, the air supply to the air supply hole H1 is stopped and the air supply hole H1 is opened to the atmosphere in the machining center. Then,
The head side pressure of the piston 51 in the handling tool 41 is reduced to atmospheric pressure, and the urging force of the coil spring 56 causes the piston 51 to move until it comes into contact with the tip surface of the convex portion 45a. As a result, the tip of the piston rod 52 comes out of the positioning hole 27e of the seat surface positioning member 27. Then, the table 1 is moved in the left-right direction to remove the grip projection 53d from the grip groove 27g of the seat surface positioning member 27.

After the jig for fixing the work is constructed by the handling tool 41 as described above, as shown in FIG. 8, the work W is mounted on the work setting block 8 by the robot R provided on the processing line. .

When mounting the work W, first the work setting block 8
A pressure oil supply hole on the head side of the piston 9 (see FIG. 2) inside
Pressure oil is supplied from 8 g to move the piston 9 to the left side in the drawing, thereby moving the side clamper block 13 to the left side and widening the dimension between the side clamper block 13 and the side support block 25. At the same time, the pressure oil supply hole 13d is provided on the head side of the piston 14 in the side clamper block 13.
Pressure oil is supplied from above to move the piston 14 to the front side, and the dimension between the bottom surface 18d of the overhead clamper 18 and the front surface 8a of the work setting block 8 is also widened. Also, in the same way,
The side support block 25 side piston rod 15 is also driven to drive the side support block 25 side overhead clamper.
The dimension between the bottom surface 18d of 18 and the front surface 8a of the work setting block 8 is also widened.

In this state, the robot R advances the work W toward the front surface 8a of the work setting block 8 to bring the work W close to the seat surface positioning member 27.

At this time, the work W advances through the space between the overhead clampers 18 installed on the left and right. Then, the forward movement is stopped in the vicinity of the seating surface positioning member 27, and then the work W is moved to the right by the robot R so that the right end of the work W is positioned in the vicinity of the protrusion 26b of the metal fitting 26. As a result, the clamping surface at the right end of the work W is located below the right overhead clamper 18. In this state, the gripping force of the work W by the robot R is released, and then the work W is advanced again, and the bottom surface of the work W is lightly applied to the seat surface positioning member 27.

Next, the work W is lowered, and the lower surface of the work W in the drawing is brought into contact with the vertical positioning member 28. This allows
The vertical position of the work W is determined. in this way,
After the work W is set by the robot R, pressure oil is supplied to the rod side of the piston 9 in the work setting block 8 from the pressure oil supply hole 8h to move the piston to the right side, whereby the side clamper block 13 is moved to the right side. Move to.
Then, the work W is sandwiched and fixed by the pressing member 24 and the receiving metal fitting 26, and the position of the work W in the left-right direction is fixed.

Further, by the above operation, the clamp surface at the left end of the work W comes to be positioned below the left side overhead clamper 18.

Next, pressure oil is supplied to the rod side of the piston 14 in the side clamper block 13 from the pressure oil supply hole 13e to move the overhead clamper 18 to the work setting block 8 side, and the work W is seated by the overhead clamper 18. Surface positioning member
Press on 27. Similarly, the piston rod 15 on the side support block 25 side is also driven so that the overhead clamper 18 on the side support block 25 side also presses the work W against the seat surface positioning member 27. In this way, the work W is fixed. As described above, the holding state of the work W by the robot R in which the work W is fixed is released,
The robot R is retracted.

As described above, the mounting of the work W on the work setting block 8 is completed.

When removing the work W from the work setting block 8, first, the work W is gripped by the robot R in a weakened state, and in this state, the pressure oil supply hole 13d is provided to the head side of the piston 14 in the side clamper block 13. Supply pressure oil from
The piston rod 15 is moved to the front side. Similarly,
The piston rod 15 on the side support block 25 side is also moved to the front side. As a result, the fixed state of the work W by the overhead clamper 18 and the pressing member 24 is released. After that, the work W is taken out in the reverse order of the mounting of the work W.

In the apparatus configured as described above, parts such as the seat surface positioning member 27 and the overhead clamper 18 for positioning the work W and fixing the work W are replaced by parts of the storage block 29. Various works W having different shapes can be mounted on the work setting block 8. Moreover, the parts such as the seat surface positioning member 27 can be replaced by grasping them with the handling tool 41 mounted on the spindle S. Therefore, it is possible to unmannedly install a wide variety of works W at the machining position of the machining center with a set of work fixing jigs.

Therefore, compared to the conventional method in which a dedicated work fixing jig is mounted on each of a plurality of pallets and the work is supplied to the machine tool together with the pallets, there is no need for a large space for preparing the pallets, etc. There is an advantage that the processing can be automated in the inside. Moreover, since a plurality of pallets, a plurality of workpiece fixing jigs, a pallet changer, and the like are not required, it is possible to reduce equipment costs.

Further, even in the case of a work W whose shape cannot be predicted initially, it is possible to install the work W on the jig body 2 simply by newly producing a relatively small part such as the seating surface positioning member 27. Therefore, for example, even when the shape of the work W changes due to the design change, the design change can be promptly dealt with at low cost. Therefore, as compared with the conventional case, the possibility of changing the production plan is reduced even in the case where the design change or the like cannot be predicted.

Further, in the machining center, since the position of the main shaft S with respect to the table 1 is indexed with high precision, the seating surface positioning member 27 and the like can be accurately positioned by the handling tool 41. Therefore, it is possible to construct a highly accurate work fixing jig.

Although the jig body 2 is directly fixed to the table 1 in the above-described embodiment, the jig body 2 is mounted on a pallet which is carried in and out on the table 1 and fixed thereto. Then, through the above pallet, table 1
It may be configured to be installed in. The overhead clamper 18, the receiving metal fitting 26, the seat surface positioning member 27, and the vertical positioning member 28 are configured to be gripped and mounted by the handling tool 41. It is needless to say that the process may be performed by a robot.

[Effects of the Invention] As described above, according to the present invention, a jig main body having a plurality of member mounting portions and installed on a table of a machine tool, and at least one member mounting member of the jig main body. And a work fixing mechanism for fixing the work to the jig main body. The work fixing mechanism is for fixing the work to a member mounting portion provided with the work fixing mechanism. A work mounting member installation section for removably installing the work mounting member is provided, and a work mounting member storage section for removably storing the work mounting member is provided in another member mounting section of the jig body. From the above, the work can be supplied to the work attachment member installation portion by a work supply means such as a robot, and when changing to a work having a different attachment portion shape, it is possible to use the gripping means such as a robot. Thus, the work attachment member of the work attachment member installation portion can be replaced with that of the work attachment member storage portion so as to match the shape of the work attachment portion.

Therefore, it is possible to unmannedly install a wide variety of workpieces at the jig body, that is, the machining position of the machine tool with a set of workpiece fixing jigs. In comparison with the conventional method of supplying the work together with the pallet to the machine tool, a wide space for preparing a large number of pallets and the like is not required, and the machining can be automated in the narrow space. Moreover, many palettes,
Since a large number of workpiece fixing jigs are unnecessary, it is possible to reduce equipment costs.

Even when a work that cannot be predicted at first is to be processed, it is possible to install the work on the jig body by newly manufacturing a small part such as a work mounting member. Become. Therefore, for example, even if the shape of the work is changed due to the design change, the design change can be promptly dealt with at a low cost, and the possibility that the production plan is changed is reduced.

[Brief description of drawings]

1 to 9 are views showing an embodiment of the present invention. FIG. 1 is a perspective view of a work fixing jig, and FIG.
FIG. 2 is a view taken in the direction of arrow II, FIG. 3 is a view taken in the direction of arrow III in FIG. 1, FIG. 4 is a perspective view of the seating surface positioning member, FIG. 5 is a perspective view of the vertical positioning member, and FIG. Cross section of the main part,
FIG. 7 is a view taken in the direction of arrow VII of FIG. 6, FIG. 8 is an explanatory view of supplying a work to a work fixing jig, and FIGS. 9A to 9D show shapes of various works. It is a perspective view. 1 ... Table, 2 ... Jig body, 7 ... Front plate, 7a ...
Machined surface, 8 ... Work setting block, 8c ... Support hole, 8d ... Cylinder hole, 9 ... Piston, 11 ... Piston rod, 12 ... Guide block, 13 ... Side clamper block, 13b ... Cylinder hole for overhead clamper, 14 …… Overhead clamper piston, 15 …… Overhead clamper piston rod, 18 …… Overhead clamper, 19 …… Overhead clamper support, 25
...... Side support block, 25c ...... Dove groove, 27 ...... Seat surface positioning member, 28 ...... Up and down positioning member, 29 …… Storing block (work mounting member storing section).

Claims (1)

[Claims] 1. A jig for fixing a workpiece, which is installed on a table of a machine tool, having a plurality of member mounting portions, and a jig main body installed on the table, and at least the jig main body. A workpiece fixing mechanism for fixing a workpiece to the jig main body, the workpiece fixing mechanism being provided in one member attaching portion, wherein the workpiece is attached to the member attaching portion provided with the workpiece fixing mechanism. A work mounting member installation portion for removably installing a work mounting member for fixing is provided, and a work mounting member storage portion for removably storing the work mounting member is provided in another member mounting portion of the jig body. A jig for fixing a work, which is provided.