JPS59118315A - Precise positioning and fixing method of work and device therefor - Google Patents

Abstract

PURPOSE:To make positioning of a work accurate, by making the work adhere closely and strongly on a datum plane after the work mounted on the reference plane has been pressed by vertical force and clamped on both ends of the same. CONSTITUTION:A work 3 is mounted on a datum plane 2a of a work supporting stand 2. Then, a first air cylinder 11 is made to act in a descending state, the work 3 is pressed lightly on the datum plane 2a through dead weight of a block 14 for pressing and is made to adhere closely to the supporting stand 2 slidably. Then the work 3 is clamped on both sides of the same by clamp claws 5. The work 3 is made to slide microscopically on the datum plane 2a after that by leaving a state of the clamped work 3 as it is and positioning of the work 3 is done at a micron order. A second air cylinder 16 is made to ascend finally, vertical force is applied to the block 14 for pressing through a pressing mechanism 21 and the work 3 is secured strongly on the datum plane 2a without causing a slip of its position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a workpiece precision positioning and fixing method and apparatus for positioning and fixing a workpiece on the micron order.

[Technical background of the invention and its problems]

When assembling devices that have precision parts, such as optical instruments and electronic devices, it is necessary to position the workpiece on the order of microns, and to firmly fix the workpiece to prevent it from shifting. However, movement is a requirement for positioning, and contrary to positioning, a requirement for fixation is that there is no deviation on the order of 9 microns, and there is a problem that the workpiece inevitably shifts due to the reaction force during fixation. In other words, when positioning and fixing a workpiece on the order of microns, the workpiece is generally moved and positioned on the order of microns, and after positioning, the workpiece is fixed without shifting, but it is difficult to fix the workpiece on a movable table etc. If the workpiece is fixed after positioning on the order of microns, the small coefficient of static friction in the guide portion of the table or the like causes trouble, and the workpiece may shift due to the reaction force during fixation.

For this reason, it is extremely difficult and almost impossible to position and fix the workpiece without moving the table or the like. This point has become a bottleneck, and there has been no conventional device that satisfies the functions of positioning and fixing a workpiece with high precision.

[Purpose of the invention]

This invention has been made in view of the above circumstances, and its purpose is to provide a method and device for precisely positioning and fixing a workpiece, which can precisely position and fix a workpiece on the order of microns. .

[Summary of the invention]

In this invention, a workpiece is placed on a reference plane, the workpiece is slidably held down by a vertical force, and clamped from both sides.
After the clamped workpiece is slid and positioned, the workpiece is firmly brought into close contact with the reference plane to position and fix the workpiece without any displacement.

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in the drawings. In the figure, reference numeral 1 denotes a base, and a workpiece support 2 having a reference plane 2a on the upper surface is attached to the center of the base 1, and a workpiece 3 can be placed on the reference plane of this workpiece support 2. It looks like this. Further, around the workpiece support stand 2, a positioning xy table 4 is installed as a positioning mechanism having a support stand through hole in the center.

The top surface of the positioning XY table 4 is lower than the top surface of the workpiece support base 2, and a pair of clamps, which are clamp bodies, are located on both sides of the workpiece support base 20 on the upper surface. A work clamp device 6 composed of claws 5, 5 is provided. Therefore, the workpiece 3 placed on the reference plane 2a of the workpiece support base 2 can be clamped from both sides by the clamp claws 5, 5, and the positioning XY table 4 can be The workpiece 3 can be positioned at a desired position by a movement of the clamp claws 5, 5 on the order of microns.

On the other hand, four pillars 7, for example, are erected on a part of the corner of the base 1. A support plate 8 is attached to the tips of these columns 7, extending between them. Furthermore, a movable plate 9 is provided on each of the columns 7, which is positioned below the support plate 8 and is movable in the vertical direction using the columns 7 as a guide. At the center of the upper surface of the support plate 8, which corresponds to the center of the reference plane 2a, there is an advancing/retracting rod 10a.
The first air cylinder 11 is attached with the first air cylinder 11 penetrating downward from the support plate 8, and the support plate 13 is still attached to the center of the lower surface of the movable plate 9 via a plurality of guide rods 12, for example, four guide rods. is suspended and fixed. Further, at the center of the support plate 13 corresponding to the center of the reference plane 2a, there is a pressurizing block 14, which serves as a presser and has a smooth surface formed on the lower surface that follows the reference plane 2a, and is movable in the vertical direction. It's been lowered. In addition, 9a is a shaft-shaped hanging part connected to the pressurizing block 14, and 9b is a support plate 13.
This is a through hole for hanging support. The tip of the advancing/retracting rod 10a of the first air cylinder 11 is connected to the center of the upper surface of the movable plate 9 via the joint 15, and the pressurizing block 14 is moved by the downward movement of the first air cylinder 11. By applying a perpendicular force to the workpiece 3 placed on the reference plane 2a through the reference plane 2a, the workpiece 3 can be slidably pressed against the reference plane 2a.

Specifically, the weight of the pressurizing block 14 is used as a perpendicular force to lightly press the workpiece 3 against the reference plane 2a so that it does not float, and the workpiece 3 is brought into close contact with the reference plane 2& in a slidable manner. Therefore, the first air cylinder 11
, a movable plate 9, and a work holding mechanism 15 that slidably presses the work 3 against the reference plane 2a from the pressurizing block 14.
MS has been completed.

On the other hand, a second air cylinder 16 is attached to the side of the upper surface of the movable plate 9, with a retractable rod 16a penetrating downward from the movable plate 9. In addition, the movable plate 9 and the support plate 1
3, a buffer body 16a is provided which is supported so as to be movable in the vertical direction using guide rods 12 as guides.

This buffer body 16a is constructed by telescopically inserting a plurality of compression springs 1B, 18 as cushioning materials between two plate members 17 and 17, and includes a plate member 1 located on the upper side.
A transmission member 19 is provided in a protruding manner at the center of the upper surface of 7 . Further, a locking member 20 having a spherical tip is protruded from the lower surface of the plate member 17 located on the lower side, corresponding to the back surface 14a of the pressure block 14. It is locked to the pressurizing block 14. The transmission member 19 of the buffer body 16 and the second air cylinder 1
It is connected to the tip of the retractable rod 16a of No. 6 by a link 21a having a fixed fulcrum 22 in the center, and when the second air cylinder 16 ascends, the link 21a, the buffer body 16, and the pressurizing block 14 are connected to each other. By applying a perpendicular force without shock to the workpiece 13 placed on the reference plane 2a via the reference plane 2a, the workpiece 13 can be firmly and tightly fixed to the reference plane 2a. In addition, 2
3 is a fixed fulcrum support member provided on the movable body 9. Therefore, using the pressurizing block 14 of the work holding mechanism 15,
Further, the pressurizing mechanism 21 is constituted by a pressurizing system of the second air ring 16 with a buffer body 16a inserted in the transmission path.

Next, a precise positioning and fixing method using the workpiece precision positioning and fixing device configured as described above will be explained.

First, the workpiece 3 is placed on the reference plane 2a of the workpiece support table 2 manually or by a loading device (not shown). Next, the first air cylinder 11 is moved downward, and the pressurizing block 14 is placed on top of the workpiece 3. As a result, the workpiece 3 is lightly pressed onto the reference plane 2a by the weight of the pressure roller 14, and is slidably brought into close contact with the workpiece support base 2. Note that the workpiece 3 is held down so as not to cause floating. Next, the workpiece 3, which is being held down by the clamp claws 5, is clamped from both sides (horizontally).

This clamping is performed while the workpiece 3 is moved horizontally on the reference plane -2a. After clamping, the positioning XY table 4 is slightly moved in the X direction (left/right direction) or Y direction (depth direction) to remove the workpiece 3.
Slide it on the reference plane 2a while keeping it clamped,
Performs workpiece positioning in micron order. In addition,
Positioning on the order of microns is performed by directly placing a measuring device (not shown) such as an electric micro on the workpiece 3 to measure the amount of movement. At this time, the workpiece condition is such that the coefficient of friction between the workpiece 3 and the reference plane 2a is relatively large (it varies depending on the materials of the workpiece 3 and the reference plane 2a, but is generally about 0.1 to 0.3). ), the position is in a state where misalignment is less likely to occur. When the positioning is completed, the second air cylinder 16 is moved upward and a shock-free vertical force is applied to the pressurizing block 14 via the link 21a and the buffer 16a, thereby lifting the workpiece 3. The workpiece 3 is firmly clamped and fixed on the reference plane 2a without causing positional deviation (movement of the workpiece 3) on the order of microns.

Therefore, the workpiece 3 can be accurately positioned and fixed on the order of microns.

〔Effect of the invention〕

As explained above, in this invention, a workpiece placed on a reference plane is lightly pressed against the reference plane, the workpiece is then clamped from both sides, and the workpiece is slid slightly while being held down on the reference plane. Since the workpiece is then fixed on the reference plane by applying a contact force to the upper surface of the workpiece, the workpiece is held down to prevent movement between the workpiece and the reference plane, which causes positional deviation during fixation. Precise positioning and fixing on the order of microns can be achieved by preventing damage due to an increase in the frictional force between the parts.

In addition, this invention includes a workpiece support table having a reference plane on which the workpiece is placed, a workpiece holding mechanism that slidably presses the workpiece with a vertical force, a clamp body that clamps the workpiece from both sides, and a microscopic movement of the clamp body in the X and Y directions. The device is equipped with a positioning mechanism that moves the workpiece, and a pressure mechanism that uses a buffer in the transmission path and fixes the workpiece on the reference plane using a perpendicular force via the workpiece holding mechanism of the workpiece holding mechanism, making it possible to slide the workpiece. The workpiece can be fixed without shifting through a series of processes such as holding the workpiece down as much as possible to prevent it from shifting when fixing it, and fixing it using the workpiece holding mechanism of the workpiece holding mechanism using vertical force without shock. It is possible to provide a workpiece precision positioning and fixing device that can precisely position and fix a workpiece on the micron order.

[Brief explanation of the drawing]

The drawing is a partially sectional side view showing an embodiment of the present invention. 2... Work support stand, 2a... Reference plane, 3...
Workpiece, 4... XY table for positioning (positioning mechanism), 5... Franz 0 jaw (clamp body), 11...
・First air cylinder, 14... Pressure block (holding body), 15... Work holding mechanism, 16h...
Buffer, 16...Second air cylinder, 21a.
... Link, 21... Pressure mechanism. Applicant's agent Takehiko Suzue, patent attorney

Claims (1)

[Claims] 1. Place the workpiece on the reference plane, then lightly press the workpiece against the reference plane, then clamp the workpiece from both sides, and then place the workpiece in the clamped state on the reference plane. A method for precisely positioning and fixing a workpiece, which is characterized by positioning the workpiece by slightly sliding the workpiece, and fixing the workpiece on a reference plane by applying a contact force to the upper surface of the workpiece. 2. A work support stand equipped with a reference plane on which the work is placed, and a work holder that applies vertical force to the upper surface of the work to be placed via the presser body to slidably press the work against the reference plane. A mechanism, a 22770 body that clamps the placed workpiece from both sides, a positioning mechanism that supports this clamp body and moves the clamp body minutely in the X and Y directions, and a buffer in the transmission path. A workpiece precision positioning and fixing device comprising: a pressurizing mechanism that fixes the workpiece on a reference plane by applying a force perpendicular to the upper surface of the workpiece through a presser body of a workpiece holding mechanism.