JP2001300831A - Positioning mechanism of perforated work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably exhibit the positioning function to perforated works of various sizes and shapes. SOLUTION: Clamp members 10 are provided with pressing-down parts 11 overhanging to the outer diameter side of a hole 50. The respective pressing- down parts 11 are moved between a standby position held in an inside dimension or less of the hole 50 and a clamp position opposed to a peripheral edge part of the hole 50. Receiving members 20 are provided with receiving parts 21 corresponding to the pressing-down parts of the respective clamp members. These receiving parts 21 are moved in the radial direction of the hole 50. When positioning the work 40, the pressing-down parts 11 of the clamp members 10 are arranged in the clamp position. The peripheral edge part of the hole 50 is clamped with the receiving parts 21 opposed to these pressing-down parts 11. The receiving members 20 are engaged with an inner peripheral surface of the hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism suitable for positioning a work having a positioning hole, particularly a thin plate-shaped perforated work.

[0002]

2. Description of the Related Art A body panel of an automobile is provided with a large number of holes for positioning during assembly. Conventionally, a mechanism shown in FIG. 7 has been used as a workpiece positioning mechanism utilizing such holes.

This positioning mechanism comprises a plurality of (three in the drawing) clamp members 1 inserted into holes 5 of a work 4 and a receiving member 2 arranged corresponding to each clamp member 1. The clamp members 1 are movable in the axial direction and the radial direction of the hole 5, respectively. When positioning, each clamp member 1 is arranged on the inner diameter side of the inner periphery of the hole 5 and floats from the surface of the work 4. In this state, the workpiece 4 is placed on the receiving member 2, and then each clamp member 1 is moved down to the outer diameter side and is pressed against the workpiece 4, and the clamp member 1 and the receiving member 2 form the hole 5. The periphery is clamped. At this time, the workpiece 4 is positioned in the radial direction by engaging the outer peripheral surface of each clamp member 1 with the inner peripheral surface of the hole 5.

[0004]

In the conventional structure shown in FIG. 7, since the receiving member 2 is fixed at a fixed position, when the shape of the work 4 changes as shown in FIG. Sometimes interfered with the work 4 and the positioning function could not be obtained.

Accordingly, an object of the present invention is to provide a positioning mechanism capable of stably exhibiting a positioning function for perforated works of various sizes and shapes.

[0006]

In order to achieve the above object,
The present invention provides a positioning mechanism for positioning a work by clamping a peripheral portion of a hole provided in a work, wherein each of the holding portions protrudes to the outer diameter side of the hole, and each holding portion is formed inside the hole. A plurality of clamp members that are movable between a standby position for holding the dimension or less and a clamp position facing the peripheral portion of the hole, and a receiving portion corresponding to a holding portion of each clamp member, and provided in a radial direction of the hole. A plurality of movable receiving members, wherein at the time of positioning the work, the pressing portion of the clamp member is arranged at the above-described clamp position, and the peripheral portion of the hole is clamped with the receiving portion facing the clamp member; Alternatively, one of the receiving members is engaged with the inner peripheral surface of the hole.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Explanation will be given based on FIG.

The positioning mechanism according to the present invention is for positioning a perforated work. As shown in FIG. 1, a plurality of (two in the drawing) clamp members 10 and a plurality of receiving members arranged in the same number as the clamp members 10 are provided. Member 20 and clamp member 1
0 and a driving mechanism 30 (see FIGS. 3 and 4) for driving the receiving member 20 are main components.

As shown in FIGS. 1 (a) and 1 (b), at one end of the clamp member 10, a pressing portion 11 which protrudes toward the outer diameter side of the hole 50 is formed. A flat pressing surface 13 parallel to the surface is formed in a portion (lower portion in the drawing) facing the surface. Each of the clamp members 10 is synchronously driven in a radial direction (hereinafter, simply referred to as a “radial direction”) of the hole 50 by a driving mechanism 30 described later so that the distance between the pressing portions 11 expands and contracts.
Are driven synchronously in the axial direction of the hole 50 (hereinafter simply referred to as “axial direction”) so as to approach / separate from the surface of the work 4. The radial movement and the axial movement cause the clamp member 10 to move.
As shown in FIG. 1B, the holding portion 11
And a clamp position that is in close contact with the peripheral portion of the hole 50, and as shown in FIG.
In addition, reciprocation is performed between the workpiece 4 and a standby position floating above the surface of the workpiece 4. The radial movement and the axial movement may be performed sequentially or simultaneously. In this case, the holding unit 11 reciprocates in a direction inclined with respect to the axial direction. FIG. 1 (a)
As shown in FIG. 2, the two clamp members 10 are arranged stepwise on both sides of the diameter of the hole 50. Therefore, even when both clamp members 10 are displaced to the inner diameter side of the hole 50, the clamp members 10 There is no collision or interference between them.

The receiving member 20 is provided with a receiving portion 21 and an upright portion 23 that stands in the axial direction from the inner diameter of the receiving portion 21. A flat receiving surface 25 parallel to the surface of the receiving portion 21 facing the surface of the workpiece 40 is formed at the portion (upper portion in the drawing), and this positioning surface is used for positioning as shown in FIG. The thin plate-shaped work 40 is clamped between the plate 25 and the pressing surface 13 of the clamp member 10 in close contact with each other. As shown in FIG. 1A, the upright portions 23 of the present embodiment are provided on both sides of the clamp member 10, and the outer diameter surface of each upright portion 23 is the inner circumference of the hole 50. For example, as shown in FIG. 1A, it is formed in a spherical shape so as to fit the surface. The receiving members 20 are synchronously driven in the radial direction by the driving mechanism 30 so that the distance between the receiving members 20 expands and contracts, whereby the receiving portion 25 moves between the clamp position and the standby position. The clamp position here is a position facing the pressing portion 11 of the clamp member 10 at the above-described clamp position (FIG. 1), and the standby position is a position on the inner diameter side of the clamp position. The position is such that it can be inserted into the inner periphery and the receiving part 21 can support the peripheral part of the hole 50 of the work 40 (FIG. 2). Receiving member 20
May be moved not only in the radial direction as described above, but also in the axial direction.

FIGS. 3 and 4 show an example of the drive mechanism 30, which is a combination of a cylinder 60 and link mechanisms 70 and 80. FIG. As shown in FIG. 3A, the link mechanism 70 is configured by intersecting the clamp members 10 with each other, and connecting the intersecting portions by pins 71 so as to be relatively rotatable. The other end of the clamp member 10 is provided with an elongated hole 72 inclined with respect to the axial direction, and a first rod 62a extending from the cylinder 60 through a pin 73 fitted in the elongated hole 72 is used for both clamps. It is connected to the member 10. The link mechanism 80 connects the intersecting portion of the receiving member 20 with the pin 81 in the same manner as described above, and connects the second rod 62 b extending from the cylinder 60 through the pin 83 to the long hole 82 provided at the end of the receiving member 20. It is constituted by combining. When the first and second rods 62a, 62b are reciprocated in the axial direction by using the link mechanisms 70, 80, the radial movement and the axial movement of the clamp member 10 and the receiving member 20 are controlled by the two members 10, 20. Can be performed independently.

The cylinder 60 has a structure in which two cylinder elements 60a and 60b are integrated as shown in FIG. 4, and has two pistons 61a and 61b and a piston rod 62.
a, 62b. Cylinder elements 60a, 60b
Are partitioned by a partition 63, and pistons 61a and 61b are arranged on both sides of the partition 63, respectively. The piston rod has a double structure including a first rod 62a and a second rod 62b coaxially arranged.
a and 62b can independently move forward and backward. The inner first rod 62a is attached to the rod-side piston 61a,
The outer second rod 62b is connected to the head-side piston 61b, respectively. The first rod 62a and the rod-side piston 61a are connected via a pin 64 or the like penetrating the second rod 62b, and the first rod 62a and the second rod 62b are Measures have been taken to secure the movement path of the pin 64 during the relative movement with the rod 62b. Both pistons 61a,
Ports 65a, 65b, 66a, 66b for opening and closing a working fluid such as air into and out of the space on both sides of the opening 61b are opened, and supply and cutoff of the working fluid to and from these ports 65a, 65b, 66a, 66b are controlled. Thereby, the first rod 62a and the second rod 62b can be independently reciprocated in the axial direction. In this case, as described above, the radial movement and the axial movement of the clamp member 10 are performed via the link mechanism 70 by the forward / backward movement of the first rod 62a, and the link mechanism 80 via the forward / backward movement of the second rod 62b. The radial movement and the axial movement of the holding member 20 are performed.

The positioning of the work by the positioning mechanism is performed in the following procedure. First, the drive mechanism 30 is operated to place the clamp member 10 and the receiving member 20 at the standby position. Next, the workpiece 40 is received while the clamp member 10 and the upright portion 23 are inserted into the inner periphery of the hole 50.
0 on the receiving portion 21 (state of FIG. 2). afterwards,
The drive mechanism 30 is activated, the clamp member 10 is moved to the clamp position and pressed against the peripheral edge of the hole 50, and at the same time, the receiving member 20 is displaced to the outer diameter side to be disposed at the clamp position. The amount of movement of the clamp member 10 and the receiving member 20 in the radial direction is determined in advance so that the upright portion 23 engages with the inner peripheral surface of the hole 50 at the same time when the clamp member 10 and the receiving member 20 reach the clamping position. As described above, as shown in FIG. 1, the work 40 is clamped between the holding portion 11 and the receiving portion 21, and the work 40 is restrained in the radial direction of the hole 50 by engagement with the upright portion 23. , Work 40
Is completed.

In this case, even when the workpiece 40 is changed to one having a different size of the hole 50 or one having a different peripheral shape of the hole 50, the movement amount of the clamp member 10 or the receiving member 20 is corrected to obtain the structure shown in FIG. Work 40 in the same manner as
Can be positioned. Therefore, the positioning can be performed irrespective of the type of the work, and the versatility of the positioning mechanism is enhanced.

In the above description, a combination of the link mechanisms 70 and 80 and the cylinder 60 has been exemplified as the drive mechanism 30, but at least the radial and axial movement of the clamp member 10 and the radial movement of the receiving member 20 have been described. The structure is arbitrary as long as it can be controlled. For example, a combination of a motor and a ball screw can be used.

Further, by adding an encoder and a brake, it is possible to automatically correspond to a specified hole diameter.

1 and 2, the receiving member 20
Although the structure in which the upright portion 23 provided on the inner surface of the hole 50 is engaged with the inner peripheral surface of the hole 50 has been exemplified, the clamp member 10 may be engaged with the inner peripheral surface of the hole 50 to restrict the workpiece 40 in the radial direction. FIG. 5 shows an example in which the outer peripheral surface of the clamp
By engaging with the inner peripheral surface of the cylinder 0, a function of restraining in the radial direction is obtained. In this case, the upright portion 23 of the receiving member 20 shown in FIGS. 1 and 2 becomes unnecessary. The other points are common to the structures of FIGS. 1 and 2, and thus the same reference numerals are given to the common members, and redundant description will be omitted.

FIG. 6 shows another embodiment, and FIG.
As in the embodiment, the outer peripheral surface of the clamp member 10 is
This is an example of engagement with the inner peripheral surface of the first embodiment. Three each of the clamp member 10 and the receiving member 20 are arranged. Above the clamp member 10, a cover 9 having a reduced upper end is provided.
0, and the reduced diameter portion 91 of the cover 90
By guiding the holes of the work, the work can be smoothly arranged on the receiving member 20. Also in this embodiment, the clamp member 10 and the receiving member 20 are displaced toward the outer diameter side from the standby state shown in FIG.
By further lowering the clamp member 10 (see FIG. 3), a work (not shown) can be positioned.

[0019]

As described above, according to the present invention, even perforated works having different hole sizes and shapes can be accurately positioned, and the versatility of the positioning mechanism is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a positioning mechanism according to the present invention (in a clamped state).

FIG. 2 is a sectional view of a positioning mechanism according to the present invention (an unclamped state).

FIG. 3 is a front view showing an example of a link mechanism constituting a drive mechanism.

FIG. 4 is a sectional view of a cylinder constituting the drive mechanism.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention.

FIG. 6 is a perspective view showing another embodiment of the present invention.

FIG. 7A is a plan view of a conventional positioning mechanism,
(B) is a sectional view thereof.

FIG. 8 is a sectional view showing a positioning step using a conventional mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Clamp member 11 Holding part 13 Holding surface 20 Receiving member 21 Receiving part 25 Receiving surface 30 Drive mechanism 40 Work 50 Hole

Claims (1)

[Claims] 1. A positioning mechanism for positioning a work by clamping a peripheral portion of a hole provided in the work, wherein each of the holding portions is provided with a holding portion projecting to an outer diameter side of the hole. A plurality of clamp members movable between a standby position for holding the inner diameter or less and a clamp position opposed to a peripheral portion of the hole; and a receiving portion corresponding to a holding portion of each clamp member. A plurality of receiving members that are movable at the same time. When positioning the work, the pressing portion of the clamping member is disposed at the above-mentioned clamping position, and the peripheral portion of the hole is clamped with the receiving portion facing the clamping member. A positioning mechanism for a perforated work, wherein one of a member and a receiving member is engaged with an inner peripheral surface of a hole.