JPH01310833A - Clamping device for non-magnetic substance work - Google Patents

Abstract

PURPOSE:To position and secure a work on a table with high precision through simple structure, by a method wherein a pair of clamp blocks of a magnetic material rotatably positioned facing each other on both sides of a work on the table are rotated by means of the magnetic force of the table. CONSTITUTION:A pin 5 to support the one clank block 3 is supported in an oblong hole formed in a frame 4, and a backward movement position is regulated by means of a bolt 6 screwed along a longitudinal direction. Through regulation of screwing of the bolt 6, the two clamp blocks 3 are caused to approach and part from each other, and a position is regulatable according to the size of a work 2. In the block 3, a center of gravity is situated closer to a end part 3b than an end part 3a, and is brought into a state in which the end part 3a is rotated upward around the pin 5. When a table 1 generates an adsorbing force by means of a magnet, the end part 3a of each block 3 of a magnetic material is attracted to the table 1 side and rotated, and both sides of the work 2 are nipped therebetween to securely press it against the table 1.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a non-magnetic workpiece that uses displacement of a point of application of circular motion to press and position and fix a non-magnetic workpiece against a positioning table. This invention relates to a workpiece clamping device.

(Prior art) When flat grinding a workpiece, in order to obtain accurate levelness, the workpiece is placed on a positioning table, and the workpiece is positioned and fixed in a state where it is pressed against the installation surface via a fixing means.
Using this as a reference surface for grinding, the workpiece is flat ground.

As a fixing structure for fixing the workpiece to this installation surface, a magnetic positioning table is generally used when the workpiece is a magnetic material, and the workpiece can be fixed onto the positioning table with high precision by magnetic attraction force.

However, if the workpiece is a non-magnetic material such as a ceramic bar, magnetic attraction force cannot be used directly.

Therefore, as an alternative fixing structure, wax adhesion, fixing with a vise, and vacuum chuck system have been employed in the past.

However, each of these fixing means has the following drawbacks.

(Problem to be Solved by the Invention) In other words, in the case of wax adhesion, when mounting to a positioning table that is a reference surface, the thickness of the wax layer as an adhesive is generated relative to the surface, so the horizontality and thickness of the workpiece may be affected. I was not able to accurately express the Another disadvantage is that it takes a lot of time to fix the workpiece.

On the other hand, with the fixing structure using a vise, the vise itself or the positioning table occupies a large area, so the fixing structure is large compared to the size of the workpiece, and the accuracy is low.

Furthermore, with the vacuum chuck method, if the workpiece has holes, it cannot be suctioned, and depending on the shape of the workpiece, it becomes difficult to suction it, making it difficult to handle it.

The present invention was made in view of the above-mentioned drawbacks, and provides a clamping device for non-magnetic workpieces that can accurately fix non-magnetic workpieces to a positioning table and that also has a compact fixing mechanism. The purpose is to provide

(Means for Solving the Problems) In order to achieve the above-mentioned objective 1, the present invention provides a magnetic adsorption type positioning table on which a non-magnetic workpiece is placed;
This positioning table consists of a pair of clamp blocks made of magnetic material that are rotatably arranged opposite each other on both sides of the workpiece installation position, and each clamp block is always urged to rotate toward the unclamping side. At the same time, the positioning table was rotated toward the clamp side by the magnetic force generated in the positioning table, so that both sides of the workpiece were held and pressed onto the table.

Further, in the present invention, one of the clamp blocks may be provided with an adjustment mechanism for adjusting the movement of the fulcrum portion toward the other side.

(Function) According to the above configuration, each clamp block rotates from the unclamping position toward the clamping side of the workpiece due to the attraction magnetic force of the magnet.

Then, by the displacement of the point of action of the circular motion caused by this rotation, both sides of the workpiece are held, and in this state, the workpiece is pushed onto a positioning table to be positioned and fixed.

By moving the fulcrum of one clamp block, it is possible to position and fix workpieces of different sizes.

(Embodiments) Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. Figs. 1 to 4 show a first embodiment of the present invention.

In the figure, 1 is a magnetic attraction type positioning table for positioning a workpiece, and 2 is a non-magnetic workpiece such as a ceramic bar fixed on the positioning table 1.

A pair of clamp blocks 3 made of magnetic material are arranged facing each other on both sides of the workpiece 2, and a rectangular frame 4 is placed on the table 1 to surround the outer periphery of each clamp block 3 and the workpiece 2. Fixed location.

A magnet (not shown) is built into the positioning table 1, and when it is energized, it has the effect of attracting the clamp side end of each clamp block 3.

Each of the clamp blocks 3 is rotatable toward the workpiece 2 about a fulcrum pin 5 that passes through both sides of the frame 4 and is supported by a bearing.

Also, a fulcrum pin 5 supporting one clamp block 3 is provided.
As shown in FIG. 4, the elongated hole 4 formed in the frame 4
a, and its retreat position is regulated by an adjustment bolt 6 screwed and fixed along the longitudinal direction inside the frame 4.

By screwing and adjusting the adjustment holt 6, one clamp block 3 can be moved toward or away from the other clamp block 3, and the clamp position can be adjusted according to the size of the workpiece 2.

In the above configuration, the center of gravity of each clamp block 3 is biased toward the end 3b on the non-clamping side from the end 3a on the work clamp side with the fulcrum pin 5 in between, and the third
As shown in Figure (a), when the magnet does not have the attraction effect, the clamp side ends 3 are mutually centered around the fulcrum pin 5.
a is rotated upward (position of point A in FIG. 1), and is in an unclamped position with a predetermined gap maintained between it and the workpiece 2.

Furthermore, when the attraction force is generated by the magnet, the clamp side end 3a of each clamp block 3 is attracted to the table 1 side, and as a result, it rotates around the fulcrum pin 5 toward the clamp side, and the As shown in FIG. 3(b), both sides of the workpiece 2 are clamped and the workpiece 2 is fixed in a pressed state on the table 1 (position of point B in FIG. 1).

Since the frame 4 is made of a non-magnetic material, it is not magnetized when attracted by a magnet, and does not interfere with the rotational displacement of the clamp block 3.

Therefore, after positioning the workpiece 2 between the clamp blocks 3 with the magnet turned off, the magnet is turned off.
N, each clamp block 3 rotates toward the clamp side, clamps both sides of the work 2 with its clamp side end 3a, and fixes the work 2 on the table 1 in this state.

As a result, the workpiece 2 is positioned and fixed with a clearance of 0 using the table 1 as a reference surface for grinding, and then the upper surface side is ground by a grinding wheel or the like (not shown).

Next, FIGS. 5 and 6 show a second embodiment of the present invention.

This embodiment shows a mass-produced positioning device applied to position and fix a plurality of non-magnetic workpieces at the same time. Three frames 10 are fixedly arranged in parallel on a positioning table 1, and each A workpiece 2 is installed at a central position between the frames 10, and a pair of clamp blocks 12 are placed on both sides of each workpiece 2.

Each clamp block 12 is rotatably supported by a fulcrum pin 14 that passes between each frame 10 and is supported by a bearing, and each clamp block 12 has an elongated hole extending vertically on the front side of the fulcrum pin 14. A guide hole 16 is formed,
By engaging guide pins 18 which pass through each frame and are supported by the guide holes 16, back-and-forth rattling is prevented.

In this embodiment, as in the previous embodiment, each clamp block 12 is rotated toward the unclamp side when the magnet is turned off, and the workpiece 2 can be placed between both clamp blocks 12 in this state.

Next, by turning on the magnet, the workpiece 2 is rotated toward the clamp side, and is pressed onto the table 1 while holding both sides of the workpiece 2, and in this state, the upper surface is ground.

Incidentally, in this embodiment as well, a clamp position adjusting means can be provided as in the first embodiment.

(Effects of the Invention) As described above in detail using the embodiments, the clamping device for non-magnetic workpieces according to the present invention has the following effects.

Due to the attractive magnetic force of the magnet, each clamp block rotates from the unclamping position toward the clamping side of the workpiece, and by the displacement of the point of action of the circular motion caused by the rotation, both sides of the workpiece are clamped, and the workpiece is positioned in this state. Press it against the table to position and fix it.

Therefore, the positioning accuracy is high, and the clamping/unclamping action uses the attraction force of the magnet.
The structure is simple and compact, and can be made small.

By adopting the structure according to claim 2, it is possible to adapt to the positioning and fixing of works of different sizes.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is an explanatory diagram of the operation, FIG. 2 is a plan view, and FIGS. 3(a), (
b) is an explanatory cross-sectional view showing the clamp/unclamp state taken along the line ■-■ in Fig. 2, and Fig. 4 is the IV in Fig. 2.
-IV line sectional view, FIG. FIG. 6 shows a second embodiment, FIG. 5 is a plan view, and FIG. 6 is a sectional view taken along the line ■--■ in FIG. 1...Positioning table (magnetic table) 2.
... Workpiece 3.10 - Clamp block 5.14 ... Fulcrum pin Patent applicant Fuji Electrochemical Co., Ltd. Agent
People Patent Attorney - Ken Iro Chikuma Patent Attorney Masatoshi Matsumoto Figure 1 Figure 2

Claims (2)

[Claims] (1) Consists of a magnetic adsorption type positioning table on which a non-magnetic workpiece is installed, and a pair of clamp blocks made of magnetic material that are rotatably arranged opposite to each other on both sides of the workpiece installation position of this positioning table, Each of the clamp blocks is always urged to rotate toward the unclamping side, and is also rotated toward the clamping side by the magnetic force generated in the positioning table, and presses the workpiece onto the table while holding both sides of the workpiece. A non-magnetic workpiece clamping device characterized by: (2) The device for clamping a non-magnetic workpiece according to claim 1, wherein one of the clamp blocks is provided with an adjustment mechanism for adjusting the movement of the fulcrum portion toward the other side.