JPH0230450A - Positioning device for workpiece - Google Patents

Abstract

PURPOSE:To securely position a work by elastically holding a ring type guide part having an internal peripheral surface to guide the external peripheral surface of the work and driving a movable contact part making contact with the other edge side external peripheral surface of the work as well as a fixing contact part. CONSTITUTION:A ring type guide part 2 is supported in the floating state by an elastic body 3 in a work holding hole 10. A fixing contact part 4 is also provided with three fixing contact surfaces 40a. And a movable contact part 5 is arranged capable of going into and coming out of the work holding hole 10. If one edge part of a work 7 is inserted into the work holding hole 10, an external peripheral surface 70 makes contact with the second taper-type internal peripheral surface 24 of the ring type guide part 2. Next, if a drive part 6 is driven, a movable contact member 50 advances into the work holding hole 10 and makes contact with and presses the external peripheral surface 70. Consequently, the work 7 is pushed an pressed by the three pieces of fixing contact surfaces 40a and the movable contact member 50 to be positioned in a reference fixing position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a workpiece positioning device. This workpiece positioning device can be used, for example, when a workpiece transported to a processing station by a transporting device of a processing line is inserted into a processing jig of a machine tool and positioned at its processing reference position.

[Prior art] As one of the conventional workpiece positioning devices, a workpiece to be machined is inserted into a reference hole of a processing jig, and the outer circumferential surface of the workpiece, which serves as a processing reference, is aligned with the reference hole. There is a method for positioning the workpiece. Furthermore, the clearance between the outer circumferential surface of the pre-caulked work and the reference hole of the machining jig is set to be small so as not to reduce the machining accuracy of the work.

U Problem to be solved by the invention Due to the gripping error of the workpiece, the workpiece gets stuck in the reference hole, resulting in incorrect insertion, which causes the processing machine to stop and the operating rate to decrease.

SUMMARY OF THE INVENTION An object of the present invention is to provide a workpiece positioning device that solves the conventional problems.

Means for Solving the Problems 1 The workpiece positioning device of the present invention includes a workpiece holding base having a workpiece holding hole, a 'TI fitted into the workpiece holding hole so as to be movable in the radial and axial directions, and the workpiece positioning device of the present invention. A ring-shaped guide part having an inner circumferential surface that guides the outer circumferential surface of the workpiece holding hole and the ring-shaped guide part is installed between the workpiece holding hole and the ring-shaped guide part, and the ring-shaped guide part is guided in the radial and axial directions of the workpiece holding hole. an elastic body that elastically holds the workpiece in a movable manner; a fixed abutting portion formed on the inner circumferential wall of the workpiece holding hole and in contact with the outer circumferential surface of the workpiece; and a workpiece holding base that is movable into and out of the workpiece holding hole It is characterized by comprising a movable contact part that is slidably held and comes into contact with the outer surface of the other end of the workpiece together with the fixed contact part, and a drive part that drives the movable contact part.

"Operation of the Invention" When the workpiece is inserted into the workpiece holding hole by the conveyance device, the outer peripheral surface of one end of the workpiece contacts the inner peripheral surface of the ring-shaped guide part, supporting the ring-shaped guide part in a floating state. The elastic body is displaced and inserted into the workpiece holding hole.After this, the clamp of the conveyor device is released from the workpiece, and the movable contact part is driven by the drive unit, and one side wall of the workpiece is moved. The movable contact portion and the fixed contact portion grip the workpiece by pressing in the direction of the fixed contact portion.This allows the workpiece to be accurately positioned at the processing reference position.

[Effects of the Invention] In the workpiece positioning device of the present invention, since the movable contact portion is retracted, the workpiece can be smoothly inserted into the workpiece holding hole having a larger hole diameter in the workpiece holding base. In addition, since the ring-shaped guide part is elastically held by an elastic body so as to be able to float in the radial and axial directions of the work holding hole, the outer periphery of the work can be smoothly inserted into the inner periphery of the ring-shaped guide part. . Further, the workpiece held by the ring-shaped guide portion can be brought into contact with the fixed abutment portion by driving the movable abutment portion 111J, and the workpiece can be reliably positioned at the processing reference position.

In this way, the workpiece will not be stuck in the workpiece holding hole, the processing machine will not have to stop, and the operating rate will be improved by 1q.

[Embodiment 1] An embodiment of the workpiece positioning device of the present invention will be described based on FIGS. 1 to 3.

The workpiece positioning device according to the embodiment of the present invention includes a workpiece holding base 1, a ring-shaped guide portion 2, an elastic body 3, a fixed contact portion 4, a movable contact portion 5, and a drive portion 6. Become.

A workpiece holding base (hereinafter referred to as the base) 1 is constructed of a thick plate having a workpiece holding hole 10. This base 1 has a groove (=1 side 12) on the end side where the work 7 is inserted.
a, and the mounting surface 12. b is formed in a stepped manner, and the mounting surface 12
b is formed at a position shifted to the right in FIG. 1 compared to the mounting surface 12a.

In addition, the base 1 has a first guide hole 121 that is provided parallel to the mounting surface 12b, and a first guide hole 121 and the mounting surface 12b.
It has an opening 121a passing through. Further, the inner circumferential wall 100 of the work holding hole 10 has a first ring-shaped recess 102;
A concave portion 104 on the other end side is formed, and four guide portions 105 are formed in the concave portion 104 on the other end side at 23 to 4 positions on the circumference. The other end of the base 1 is connected to a cylinder device 11 for moving the base. This base moving cylinder device 11 includes a cylinder body 1 fixed to a four-way fixing member.
10, and a piston shaft 11 which is held in the cylinder body 110 in a reciprocating manner and whose one end is connected to the other end of the base 1.
Consists of 1.

The ring-shaped guide portion 2 is supported in the workpiece holding hole 10 by the elastic body 3 in a 70-ring state, and is accommodated with a slight gap maintained from the inner periphery 1100 of the workpiece holding hole 10. This ring-shaped guide part 2 comes into contact with an outer peripheral part 2a having an outer diameter smaller than the inner diameter of the workpiece holding hole 10 and an outer peripheral surface 70 on the other end side of the workpiece 7 inserted into the workpiece holding hole 10. It has an inner circumferential portion 2b for guiding 7. The outer circumferential portion 2a of the wang-shaped guide portion 2 includes a shoulder portion 25 formed at the center and large-diameter outer circumferential surfaces 26 formed at one end and the other end.
and a small diameter outer circumferential surface 27. The inner circumferential portion 2b includes a small diameter inner circumferential surface 21 formed at the center, a large diameter inner circumferential surface 22 on one end side, a small diameter inner circumferential surface 21, and a large diameter inner circumferential surface 2.
2, and a second tapered inner periphery 24 formed on the large-diameter inner periphery 22 toward one end.

The elastic body 3 supports the ring-shaped guide portion 2 in a floating state and holds it movably in the radial direction R and axial direction P of the workpiece holding hole 10. This elastic body 3 is a first ring-shaped seal member 30 attached to the first ring-shaped four parts 103 of the inner circumferential wall 100 of the workpiece holding hole 10.
and a second ring-shaped sealing member 31 attached to the third ring-shaped recess 105 of the ring-shaped fixing member 15 fixed to the base 1 with a bolt S at the end side (t!!). and a spring 32 attached to the recess 104 at the other end of the workpiece holding hole 10.These first ring-shaped seal part U30, second ring-shaped seal member 31, and spring 32 each have a larger diameter than the ring-shaped guide part 2. outer peripheral surface 26,
It is supported in contact with the small diameter outer circumferential surface 27 and the shoulder portion 25 .

The fixed contact part 4 contacts the outer peripheral surface 70 of the workpiece 7 inserted into the workpiece holding hole 10 together with the movable contact part 5,
It is something to keep. This fixed contact portion 4 is connected to the mounting portion 12.
a, a first through hole 40 that is plate-shaped and passes through the central part of the plate in the thickness direction and is concentric with the work holding hole 10, and three holes that slightly protrude into the work holding hole 100 from the inner peripheral surface thereof. The fixed abutment surface 4.0a opens onto the inner circumferential surface of the first through hole 40, and the movable abutment portion 5 can be stored in the holding hole 100 so as to be freely advanced and retracted, and serves as a second guide for the lid member 12c. A second through hole 41 is provided on the same axis as the hole 122.

This fixed abutting section 4 is fixed to the mounting section 12a of the paper making section 1 with four fixed bins 120.

The movable contact portion 5 contacts the outer circumferential surface 70 of the workpiece 7 together with the fixed contact portion 4 to fix and hold the workpiece 7 at a processing reference position. The movable contact part 5 is connected to one end of the driven rod 61 of the drive part 6 and is housed in the second through hole 41 of the fixed contact part 4, and can advance and retreat into the work holding hole 10. It has become.

The drive unit 6 includes a driven rod 61, a wedge member 62, an operating rod 63, and a cylinder device 6'l.

The driven rod 61 is slidably housed in a second guide hole 122 of a rectangular plate-shaped lid member 12C fixed to the mounting portion 12b of the base 1 by four fixed bins. It connects the abutting portions 5 and has an inclined guide groove 610 in the center that is inclined with respect to the axial direction. The wedge member 62 has one end side and the other end side connected to the storage recess 123 of the lid member 12c, the receiving hole 121a of the base 1, and the first guide hole 12.
It is slidably housed in 1. This wedge portion 062 has an inclined engagement protrusion 620 on one end side that engages with the inclined guide groove 610 of the driven rod 61 to move the driven rod 61 forward and backward toward the workpiece holding hole 10, and on the other end side. It has an engaging protrusion 621 that engages with the actuating rod 63 in an interlocking manner. The actuating rod 63 is slidably housed in the first guide hole 121 of the base 1, and has an engagement @630 at the end that engages with the engagement convex portion 621 of the wedge member 62 and transmits the driving force, The other end is connected to the end of the piston shaft 641 of the hydraulic cylinder device 64. The hydraulic cylinder device 64 includes a cylinder body 640 fixed to a four-way base;
The piston shaft 641 is held so as to be reciprocally movable.

The workpiece positioning device of this embodiment configured as described above is used to transport the workpiece 7 using the workpiece transporting device shown in FIG.
The case of positioning will be explained.

Workpiece transfer device 8 is a four-way installation station with workpiece 7.
The workpiece holder 81 of the swing arm 86 is clamped. At this point, the workpiece holder 81 grips the black part of the workpiece 7, so the workpiece 7 held by the workpiece holder 81
The gripping position varies for each workpiece 7. This swinging arm 8
6, the roller 84 on the one side is guided along the outward path guide 82a by moving the platform 83 forward along the passage section 80 in a direction perpendicular to the paper surface of FIG. , and move to the addition station A position shown in FIG. Thereafter, when the base moving cylinder device 11 is driven to move the piston shaft 111 forward, the base 1 moves from position a shown by the two-dot chain line to a position not shown by the chain line. As a result, the outer circumferential surface 70 of one end of the workpiece 7 is inserted into the workpiece holding hole 10 as shown in FIG. Then, the outer circumferential surface 70 of one end of the workpiece 7 comes into contact with the second tapered inner circumferential surface 24 of the ring-shaped guide portion 2 which is previously in the floating support position. At this time, the ring-shaped guide portion 2 is attached to the workpiece holding hole 10.
0 in the radial direction R and axial direction P, and elastically deforms the first and second ring-shaped seal parts 30 and 31 in the radial direction R and the spring 32 in the axial direction R, thereby reducing the diameter. The outer circumference of the workpiece 7 is fitted into the large inner circumferential surface 22 . In this way, the workpiece holding hole 10 of the workpiece 7
After the insertion process is completed, the clamping cylinder device 87 of the swing arm 86 is driven to release the clamp on the workpiece 7 held by the workpiece holding portion 81. When both of these drive the cylinder device 6/I of the drive unit 6 to advance the piston shaft 641, the actuating rod 63 moves in the direction of arrow x1. This movement of the actuating rod 63 is caused by the engagement groove 63
0 to the engagement convex portion 621 of the wedge member 62, and moves the wedge member 62 in the same direction (direction of arrow X1). Then, the driven rod 61 moves in the arrow Y1 direction in accordance with the position change in the arrow x1 direction of the inclined engagement protrusion 620 of the wedge member 62 that engages with the inclined guide groove 610, and the tip of the driven rod 61 The movable contact member 50 advances into the workpiece holding hole 10 and contacts and presses the other end side outer peripheral surface 70 of the workpiece 7 .

As a result, the workpiece 7 that has been temporarily held on the inner circumferential portion 2b of the ring-shaped guide portion 2 is moved to the three fixed abutment surfaces 40 of the fixed abutment portion 4 fixed to the circumferential edge of the workpiece holding hole 10.
b and the movable abutting member 50 connected to the tip of the driven rod 61, and is positioned and determined at the reference fixed position. This workpiece 7 is moved to the swinging arm 8 by the clamping device of the circuit.
The base 1 is biased from the 6 side in the axial direction P of the cotton holding hole 100.
It is lamped. In this state, by driving the swing device 88 of the workpiece conveyance device 8, the swing arm 86 swings clockwise around the shaft portion 8'6a, and the guide roller 84 is moved from the outward guide 81a to the return guide 81b. At the same time, the workpiece holder 81 is removed from the workpiece 7. Thereafter, the workpiece conveyance device 8 is returned from the processing station to the circuit mounting station position, and the workpiece 7 positioned and clamped to the base 1 is processed.

In this way, the workpiece positioning device of this embodiment has the base 1a
When inserting the workpiece 7 into the workpiece holding hole 10 and positioning it, the movable abutment part 5 has escaped, so even if the gripping position of the workpiece 7 by the workpiece holding part 81 is shifted, the workpiece 7 can be inserted into the workpiece holding hole 10. can be inserted smoothly. The inserted workpiece 7 contacts and presses the inner circumferential portion 2b of the ring-shaped guide portion 2 with the outer circumferential surface 70 of one end. This pressing force moves the floatingly supported ring-shaped guide part 2 in the radial direction R and axial direction P, and the outer circumference of the workpiece 7 can be fitted into the inner circumference part 2b of the ring-shaped guide part 2. can. Further, the workpiece 7 after insertion can be reliably positioned between the movable contacting part 5 and the fixed contacting part 4 by driving the movable contacting part 5 by the driving part 6 and making it enter the workpiece holding hole 10. .

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams showing an embodiment of the workpiece positioning device of the present invention. Fig. 1 is a longitudinal side view, Fig. 2 is a view taken along the line A-A Ii in Fig. 1, and Fig. 3 is a
FIG. 2 is a sectional view taken along line B-B in FIG. 1; Figure 4 shows
FIG. 3 is a partial longitudinal sectional side view showing a case where a workpiece transferred to the machine tool transfer device is attached to the machine tool positioning device of the present invention. 1... Work holding base 10... Work holding hole 2
...Ring-shaped guide part 3...Elastic body 30...First ring-shaped seal member 31...Second ring-shaped seal member 32...Spring 4...Fixed contact part 5...
・Movable contact part 6... Drive part 7... Workpiece

Claims (1)

[Claims] (1) A workpiece holding base having a workpiece holding hole, and a ring-shaped guide portion that is loosely fitted into the workpiece holding hole so as to be movable in the radial and axial directions and has an inner circumferential surface that guides the outer circumferential surface of the workpiece. , an elastic body that is interposed between the workpiece holding hole and the ring-shaped guide portion and elastically holds the ring-shaped guide portion so as to be movable in the radial direction and the axial direction of the workpiece holding hole; and the workpiece holding hole. a fixed abutment part formed on the inner circumferential wall of the workpiece and in contact with the outer circumferential surface of the workpiece; A workpiece positioning device comprising: a movable contact portion that contacts the outer peripheral surface of the other end; and a drive portion that drives the movable contact portion.