JPH04146039A - Grinding method and device for work with irregular surface - Google Patents

Abstract

PURPOSE:To retain a work piece surely with stability so as to carry out grinding efficiently by deforming a shape memory resin layer after compressing the non-grinding surface of workpiece under the conditions where the mat of shape memory resin layer is in a soft state, and cooling and hardening the mat for binding the workpiece thereto. CONSTITUTION:To a mat M made of a shape memory resin layer 11, the non- grinding face 16 of a workpiece W is compressed under that condition where that mat M is in a soft state exceeding the deforming point of resin, and the mat M is cooled and hardened with the deformation to meet with the shape of the workpiece W, whereby the workpiece is retained through the mat M so that it may be ground. After the grinding work, the mat M from which the workpiece is removed is softened by heat to restore. Since workpieces can be set to the mat M, it is possible to surely retain them with stability without being influenced with the difference in shape and size thereof, enable efficient grinding with the repeated use of the mat.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a workpiece grinding method and a grinding device that are particularly effective for holding a workpiece to be ground or polished when the workpiece has an irregular shape. .

[Conventional technology]

Conventionally, in order to hold a workpiece in a grinding machine as a workpiece grinding device, the following method has been used because it is necessary to utilize only the non-grinding surface of the workpiece other than the ground surface.

1. Use a magnet to hold the workpiece.

2. Use a chuck that tightens with claws.

3. Suction and fix the workpiece using air pressure.

4. Fix the workpiece with adhesive.

[Problem to be solved by the invention]

In any of the above cases, the shape and structure of the holder or holding surface must match the shape and dimensions of the non-grinding surface of the workpiece, so when the workpiece is an irregular object with different shapes and sizes, However, in today's world of low-volume, high-mix production, it is not possible to hold many types of irregularly shaped workpieces, and there are problems in terms of economy and workability.

In particular, when magnets are used, the workpiece must be a magnetic material, so there are restrictions on the material, and when using a chuck, a large amount of clamping pressure is applied to the workpiece, causing the workpiece to become weak and thin. If the material cannot withstand the pressure due to reasons such as brittleness, it cannot be held stably so that it can be ground. In addition, when using suction, it is difficult to ensure positioning accuracy because the workpiece is slippery (particularly when using a suction cup, if the workpiece is thin such as a floppy disk, the workpiece may bend due to the suction force). Furthermore, when using adhesive, the work is complicated;
In particular, it took a lot of effort to peel off, so the workability was extremely poor.

In view of the above-mentioned circumstances, the present invention has been developed to provide a workpiece that can be stably and reliably held and grinded efficiently without being subject to restrictions such as the shape, size, material, or strength of the workpiece. The purpose of the present invention is to provide a method and a grinding device for grinding a regular-sized workpiece.

[Means to solve the problem]

A method for grinding an irregularly shaped workpiece to achieve the above purpose is as follows:
The non-ground surface of the workpiece is pressed against the mat made of the shape-memory resin layer in a softened state exceeding the turning point of the resin, thereby deforming the shape-memory resin layer to match the shape of the non-grinding surface and suppressing the pressure. By cooling and hardening the mat and bonding the workpiece to it, the workpiece is held through the mat so that it can be ground, and the mat from which the workpiece has peeled off after the grinding process is restored by heating, and the mat that has been deformed in this way is restored. However, it is characterized by repeated use to hold the grinding process of the workpiece.

The grinding device for irregular-shaped workpieces consists of a mat made of a shape memory resin layer, a heating device that softens the shape memory resin of the mat at a temperature exceeding its tipping point, and a workpiece that is attached to the softened shape memory resin layer. A pressurized cooling device that presses the non-grinding surface, deforms the shape memory resin layer to match the shape, and hardens it while remaining deformed, and grinding that processes the workpiece held through the mat by matching the shape of the deformation. It is characterized by consisting of a device.

[For production]

When the shape memory resin layer of the mat is softened at a temperature exceeding the inflection point, the unground surface of the workpiece is pressed onto it, thereby deforming it into a shape that matches the shape and size of the workpiece.

For example, if the back surface of the workpiece is formed with complex irregularities, a corresponding deformation state will be obtained, and if it is flat, a deformation state will be obtained in which the periphery of the workpiece falls into the shape memory resin layer. When the shape memory resin layer is cooled and hardened while being pressed, the mold matching is confirmed as it is, so
The workpiece is stably held during the grinding operation after the pressing state is released.

Furthermore, the holding function of this mat has a close integrity that matches the shape of the non-grinding surface of the workpiece, so even if the workpiece is weak, thin, or brittle, it can be held evenly and stably due to its integrity with the mat. to maintain the ground surface.

Shape memory resin has the property of curing at a low temperature and softening at a high temperature to restore its shape after reaching a turning point determined by the material, so a deformed mat can be softened and restored by heating. and use it repeatedly.

It is desirable that the transition point be in the range of 40°C to 180°C. Temperatures outside this range are likely to cause problems due to the effects of room temperature, and temperatures higher than this are not appropriate due to energy saving and equipment issues. It lacks.

The temperature of water or air can be used to heat or cool the shape memory resin, and high frequency waves or the like can also be used for heating.

〔Example〕

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

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

In order to form the shape memory resin layer 11, the mat M is constructed in the shape of artificial turf by implanting filamentous or string-like shape memory resin material 12 on the base material 10, as shown in FIGS. 1 and 6. is,
The tipping point of the shape memory resin is set at about 50°C. Base material 1
0 is a plastic plate material with high friction, but a sheet may also be used.

To use the mat M, first soak it in hot water in a hot water bath 2a (see Figure 2) and heat it to a temperature of about 80°C. This softens the shape memory resin layer 11, so pull out the mat M from the bath 2a and place it on the base 6 of the grinding machine.
(see figure), place the workpiece W on top of it and press it. Since it is necessary to apply pressure evenly, measures such as using a plate material to hold down the workpiece W and providing a stopper for the plate material on the base 6 are taken.

The lower surface of the workpiece W, that is, the non-grinding surface 16 has complex irregularities, and the shape memory resin layer 1 of the mat M is shaped according to the irregularities.
1 is deformed (see FIG. 4), the shape is fixed by cooling the pressed state to lower the temperature to about 20°C. Then, the workpiece W is molded onto the mat M according to its shape and size, and by lowering the grindstone 18 onto the workpiece W and rotating it, the upper surface of the workpiece W is evenly ground.

After the grinding process is completed, the workpiece W is removed from the mat M (see Fig. 5), but since the removed mat M is left with an uneven deformation 19, it is returned to the hot tub 2a to restore its shape. (see Fig. 2), and in the softened state, the next workpiece W is
used for processing.

7 to 11 respectively show other embodiments of the mat M. In FIG. 7, the wire of the shape memory resin material 12 is flocked in a loop shape, and in FIG. 8, the wire is flocked diagonally. be. Moreover, in FIG. 9, a film of shape memory resin material 12 is planted.

As mentioned above, the shape memory resin layer 11 is the shape memory resin material 1
When the wire rod, string, or film is erected in step 2, since there are gaps in the layer 11, it is easy for cold water and cold air to pass through the layer 11, so that the shape memory resin layer 11 can be softened, restored, and hardened in a short time. I can do it.

In FIG. 10, a shape memory resin layer 11 is formed by laminating fibers of a shape memory resin material 12 in the form of a nonwoven fabric or felt, and in FIG. 11, it is formed into a sponge shape by foaming. On both sides, the upper surface is relatively uniform and stable, making it suitable for holding soft and flat workpieces such as floppy disks.

FIG. 12 shows an apparatus for automatically carrying out a method of grinding irregularly shaped workpieces using a belt conveyor system and NC control.

The grinding device for irregular-shaped workpieces has a belt conveyor C composed of a mat M formed on an endless belt, a drive device 1 that circulates the mat M, and a holding plate 22 that slidably receives the mat M. The belt conveyor C includes a heating device 2 for the mat M, a pressure cooling device 3 that cools the workpiece W after pressing it against the mat M, a water sprinkling device 4 that ensures cooling of the mat M, and a device that processes the workpiece W. It is constructed by sequentially arranging grinding devices 5 in the circulation direction.

The driving device 1 for the mat M consists of a driving roller 20 for belting the mat M, and a driven roller 21, and the heating device 2 has a hot water tank 2a placed under the belt conveyor C. In order to pass the mat M through it, a pair of front and rear upper rollers 25, 25, on which the mat M is hung, and a pair of front and rear lower rollers 26, 26 are installed.

The pressurized cooling device 3 has press rollers 28, 28, . Arranged. Further, the elevating frame 27 is equipped with a device capable of blowing cold air into the mat M.

The water sprinkling device 4 is an auxiliary part of the pressurized cooling device 3, and is constructed by disposing a water sprinkling pipe 3o in a box body 29 having an inlet and an outlet for the mat M and the workpiece W.

Next, a method of grinding in the above-mentioned grinding apparatus for irregularly shaped workpieces will be explained.

Operation is started by circulating the mat M by rotating the driving roller 20, and when the mat M whose shape memory resin layer 11 has been softened by the heating device 2 is delivered to the upper conveyance section, the mat M is Place the workpiece W on the rear end.

When the workpiece 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 roller 28
, 28 . . . , the workpiece W is pushed down to a predetermined position, and at the same time as the pushing down, cold air is blown into the mat M, and the pattern matching of the workpiece W to the mat M is determined. Next, the water sprinkling device 4 ensures this, and the next grinding device 5 processes the workpiece W before taking it out.

Note that this removal can also be done automatically by following another belt conveyor or the like.

Deformation 19 remains on the mat M from which the workpiece W has been peeled off, but
It is softened and restored by the next heating device 2, and then delivered to the conveying section for holding other works W.

〔Effect of the invention〕

As explained above, according to the present invention, the workpiece is pressed onto the shape memory resin layer of the mat with the non-grinding surface, and the shape memory resin layer is cooled, so that the workpiece is transferred to the mat in its shape and size. Since the molds can be assembled in accordance with the workpiece, it can be held stably and reliably without being restricted by the shape, size, material, strength, etc. of the workpiece, and grinding can be carried out efficiently. can be used repeatedly, making it economical especially when grinding irregularly shaped workpieces.Furthermore, even if the workpiece is weak, thin, brittle, or non-magnetic, it can be used accurately and without any problems. It has the excellent effect of allowing efficient grinding.

[Brief explanation of drawings]

1 to 6 show an embodiment for explaining the method of the present invention, in which FIG. 1 is a partial perspective view of the mat, and FIGS. 2 to 5
The figure is a sectional view explaining the work procedure, Figure 6 is a partial sectional view of the mat, Figures 7 to 11 are sectional views corresponding to Figure 6 showing other embodiments, and Figure 12 is the book. FIG. 2 is a sectional view illustrating the invention device. M...mat, W...work, 2...warming device,
3... Pressure cooling device, 5... Grinding device, 11...
Shape memory resin layer, 16... non-ground surface

Claims (1)

[Claims] 1. A mat (M) consisting of a shape memory resin layer (11),
The workpiece (W) is in a softened state exceeding the turning point of the resin.
By pressing the non-ground surface (16) of the mat (M), cooling and hardening the mat (M) as it is deformed by pressing, and molding the workpiece (W) thereon, the workpiece (
The workpiece (W) is held so that it can be ground, and the matte (M) from which the workpiece (W) has peeled off after the grinding process is softened and restored by heating. W) Grinding method 2 for an irregular workpiece characterized by repeated use to maintain the grinding process, shape memory resin layer (1
1), a heating device (2) that softens the shape memory resin of the mat (M) at a temperature exceeding its tipping point, and a softened shape memory resin layer (11). A pressurized cooling device (3) that presses the non-ground surface (16) of the workpiece (W), deforms the shape memory resin layer (11) according to its shape, and hardens it while remaining deformed, and a mold for the deformation. The work piece (
A grinding device for irregular-shaped workpieces, characterized by comprising a grinding device (5) for processing W).