JPH074715B2 - Grinding method and grinding device for irregular shaped workpiece - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work grinding method and a grinding apparatus which are particularly effective for holding an object to be ground or an object to be polished, which has an irregular shape. .

[Conventional technology]

Conventionally, in order to hold a work in a grinder as a work grinding device so that it can be ground, the following method has been used because it is necessary to use only the non-ground surface other than the ground surface of the work.

1. Use a magnet for the work holder.

2. Use a chuck that tightens with your nails.

3. Suction and fix the work with air pressure.

4. Fix the work with adhesive.

[Problems to be Solved by the Invention]

In any of the above cases, the shape or size of the holding tool or the holding surface needs to be adapted to the shape or size of the non-ground surface of the work, so when the work is an irregular shape with different shapes or sizes. Since it is not possible to hold many types of irregular shaped workpieces, there are problems in economic efficiency and workability in today's low-volume, high-mix production.

In particular, when using a magnet, the work must be a magnetic material, so there is a restriction on the material.When using a chuck, a large clamping pressure is applied to the work, so the work is weak and thin. If it cannot withstand the pressure due to brittleness, etc., it cannot be stably held so that it can be ground. Further, when suction is used, the work is slippery, so it is difficult to secure the positioning accuracy. Especially, when a suction cup is used, if the work is thin, such as a floppy, there is a problem that it is bent by the suction force. It was Furthermore, when using adhesive, the work is complicated,
In particular, since peeling takes time, workability was extremely poor.

In view of the above circumstances, the present invention is capable of stably and reliably holding the shape, size, and material of a work without being restricted by the strength, etc. and efficiently performing grinding. An object of the present invention is to provide a grinding method and a grinding device for a fixed work.

[Means for Solving the Problems]

The method for grinding an irregularly shaped workpiece to achieve the above object is
The non-ground surface of the work is pressed against the mat formed of the shape-memory resin layer in a softened state beyond the turning point of the resin to deform the shape-memory resin layer according to the shape of the non-ground surface and to By cooling and hardening the mat as it is and bonding the work to it, the work is held grindable through the mat, and the mat from which the work has peeled off after grinding is restored by heating, and the mat thus deformed is restored. However, it is characterized by being repeatedly used for holding the grinding process of the work.

A grinding device for an irregular shaped work comprises a mat made of a shape memory resin layer, a heating device for softening the shape memory resin of the mat at a temperature exceeding its turning point, and a work for the softened shape memory resin layer. Grinding to press the non-grinding surface, deform the shape memory resin layer according to its shape, and harden it as it is, and process the work held via the mat by the matching of the deformation. And a device.

[Action]

If the shape memory resin layer of the mat is softened at a temperature exceeding the turning point, it is pressed by the non-grinding surface of the work, so that the shape is deformed into a shape corresponding to the size.
For example, if the back surface of the work is formed in a complicated unevenness, a deformation state corresponding to it can be obtained, and if the shape is flat, a deformation state in which the peripheral edge of the work falls into the shape memory resin layer is obtained, When the shape memory resin layer is cooled and hardened in the pressed state, the mold matching is fixed as it is, so that the work is stably held in the grinding work after the pressed state is released.

Furthermore, regarding the holding function of this mat, it has a close integrity that matches the shape of the non-ground surface of the work, so even if the work is weak, thin, or brittle, it will be even and stable from the integrity of the mat. Hold the ground surface.

Shape memory resin has the property of hardening at a low temperature and softening at a high temperature to have a dual shape at the turning point set by the material, so that the deformed mat is softened / heated by heating. Originally used repeatedly.

It is desirable that the point of change is in the range of 40 ° C to 180 ° C. At temperatures outside this range, inconvenience is likely to occur due to the effects of normal temperature, and temperatures higher than that are suitable for energy conservation and equipment problems. Lack.

The temperature of water or air can be used for heating or cooling the shape memory resin, and other high frequency waves or the like can be used for heating.

〔Example〕

 Next, the present invention will be described based on the drawings of the embodiments.

1 to 6 illustrate a method for grinding an irregularly shaped workpiece, and the mat M, which is the most characteristic feature of the present invention, is used for the method.

The mat M has a first structure for forming the shape memory resin layer 11.
As shown in FIG. 6 and FIG. 6, filament-shaped or string-shaped shape memory resin material 12 is planted on the base material 10 to form an artificial turf shape, and the turning point of the shape memory resin is set to about 50 ° C. . A plastic plate material having a large friction is used as the base material 10, but a sheet may be used.

To use the mat M, it is soaked in hot water in the hot water tank 2a in advance (see FIG. 2) and heated to a temperature of about 80 ° C. Since the shape memory resin layer 11 is softened by this, the mat M is pulled out from the bath 2a, placed on the base 6 of the grinding machine (see FIG. 3), and the work W is placed and pressed. . Since pressing needs to be performed evenly, a plate material is used to press the work W,
Measures such as providing a stopper for the plate material on the base 6 are taken.

Since the shape memory resin layer 11 of the mat M is deformed in accordance with the unevenness on the lower surface of the work W, that is, the non-grinding surface 16 (see FIG. 4), cool it in the pressed state. The temperature is lowered to about 20 ° C to fix the shape. Then, since the work W is matched with the mat M according to its shape and size, a grindstone is placed on the work W.
By lowering 18 and rotating it, the upper surface of the work W is evenly ground.

After the grinding process is completed, the work W is removed from the mat M (see FIG. 5), but since the unevenness of the deformation 19 remains on the mat M from which it was removed, it is returned to the hot water tank 2a again to restore the shape. (See FIG. 2) In the softened state, it is used again for processing the next work W.

7 to 11 show other embodiments of the mat M, respectively. In FIG. 7, the shape memory resin material 12 is shown.
The wire material of No. 2 is loop-shaped, and in FIG. Further, in FIG. 9, a film of the shape memory resin material 12 is planted.

As described above, when the shape-memory resin layer 11 is a wire or string of the shape-memory resin material 12, or a film is erected, since there is a gap in the layer 11, it is easy to pass cold water or cold air into the shape-memory resin. The resin layer 11 can be softened / restored / cured in a short time.

In FIG. 10, the shape memory resin layer 11 is formed by laminating the fibers of the shape memory resin material 12 in a non-woven fabric or felt shape.
In the figure, it is formed into a sponge by foaming. In both of these examples, the upper surface is relatively uniform and stable, and is suitable for holding a soft and flat work such as a floppy.

FIG. 12 shows an apparatus for automatically carrying out the grinding method for irregularly shaped workpieces by the belt conveyor method and NC control.

The grinding device for irregular shaped work comprises a belt conveyor C including a mat M formed on an endless belt, a drive device 1 for circulating the mat M, and a holding plate 22 slidably receiving the mat M. The belt conveyor C has a mat M
In the circulation direction of the heating device 2, the press cooling device 3 that cools the work W after pressing it against the mat M, the water spray device 4 that ensures cooling of the mat M, and the grinding device 5 that processes the work W. Are arranged in order.

The drive device 1 for the mat M is composed of a drive roller 20 for belting the mat M and a driven roller 21, and comprises a heating device 2
Shows a hot water tank 2a placed under the belt conveyor C. In order to pass the mat M through the hot water tank 2a, a pair of front and rear upper rollers 25, 25 and a pair of front and rear lower rollers 2 on which the mat M is hooked.
6,26 will be erected.

The pressurizing / cooling device 3 is arranged so as to rotate by contact with a press roller 28, 28 ... Supporting the elevating frame 27 capable of wrapping the mat M and allowing the work W to escape while being pressed. Further, the descending frame 27 is provided with a device capable of blowing cool air into the mat M.

The water sprinkling device 4 forms a part of the pressure cooling device 3 as an auxiliary, and is constructed by disposing a water sprinkling pipe 30 in a box 29 having an inlet and an outlet for the mat M and the work W.

Next, a grinding method in the above-described irregular work grinding apparatus will be described.

By rotating the driving roller 20, the mat M is circulated to start the operation, and the heating device 2 causes the shape memory resin layer 11
When the softened mat M is delivered to the upper transporting part, the work W is placed on the rear end of the mat M.

When the work W reaches the pressure cooling device 3, it is sensed and the elevating frame 27 of the pressure cooling device 3 is lowered, and the pressure rollers 28, 28 are pressed.
The work W is pushed down to a predetermined position by ..., and at the same time cold air is blown into the mat M, and the mat M
The matching of the workpiece W with respect to is determined. Then, the watering device 4 ensures this, and the next grinding device 5 processes the work W before taking it out.

Note that this take-out can be automatically performed by a subsequent belt conveyor or the like.

Deformation 19 remains on the mat M from which the work W has been peeled off, but it is softened / restored by the next heating device 2 and is fed to the carrying section for holding another work W.

〔The invention's effect〕

As described above, according to the present invention, the work is pressed on the shape-memory resin layer of the mat by the non-ground surface and the shape-memory resin layer is cooled, so that the shape and size of the work on the mat are reduced. Since it can be combined as it is in a mold that conforms to, the shape and size of the work, the material, the strength, etc. can be held stably and reliably, and the grinding process can be performed efficiently. Since it can be used repeatedly, it is economical especially for grinding of irregular shaped workpieces, and even if the workpiece is weak, thin, brittle, or has no magnetism, it can be accurately and accurately It has an excellent effect that efficient grinding can be performed.

[Brief description of drawings]

1 to 6 show an embodiment for explaining the method of the present invention. FIG. 1 is a partial perspective view of a mat, and FIGS.
FIG. 6 is a sectional view for explaining the working procedure, FIG. 6 is a partial sectional view of the mat, FIGS. 7 to 11 are sectional views corresponding to FIG. 6 showing other embodiments, and FIG. 12 is a book. It is sectional drawing explaining an invention apparatus. M: Matt, W: Work, 2 ... Heating device, 3 ...
Pressure cooling device, 5 ... Grinding device, 11 ... Shape memory resin layer, 16 ... Non-ground surface

Claims (2)

[Claims] 1. A non-ground surface (16) of a work (W) is pressed against a mat (M) formed of a shape memory resin layer (11) in a softened state beyond a turning point of the resin. By cooling and hardening the mat (M) as it is, and aligning the work (W) with the work (W), the work (W) is held grindable through the mat (M), and the work (W) is kept after grinding. The peeled mat (M) is softened by heating.
A method for grinding an irregularly shaped workpiece, which is repeatedly used for holding the grinding process of the workpiece (W) while restoring and softening and restoring the mat (M) thus deformed. 2. A mat (M) comprising a shape memory resin layer (11), a heating device (2) for softening the shape memory resin of the mat (M) at a temperature exceeding its turning point, and a softening agent. The shape-memory resin layer (11) formed on the non-ground surface (1) of the workpiece (W)
6) Press the shape memory resin layer (1
A pressure cooling device (3) for deforming (1) and hardening it as it is, and a grinding device (5) for processing a workpiece (W) held via a mat (M) by matching the deformation. Grinding device for irregularly shaped workpieces