JPH03131445A - Holding tool for workpiece - Google Patents

Abstract

PURPOSE:To improve operation efficiency such as cutting work by forming a hollow cylindrical body fitted in the recessed part of a base bed out of elastic deformable material, and receiving a pedestal of mixture of thermoplastic synthetic resin and auxiliary material, softening at a prescribed temperature. CONSTITUTION:A hollow cylindrical body 2 fitted in the recessed part 4 provided on a base bed 3 at its lower end part is formed out of elastic deformable material, and a pedestal 7 made of mixture of a main material 5 softening at temperature range 40-200 deg.C and an auxiliary material 6 compensating the property of the former is received in the hollow space of the cylindrical body 2. When appropriate pieces of holding tool for it are arranged and the pedestal 7 is heated, the main material 5 constituting the pedestal 7 is softened rubber- likely, hereby accompanying with that the cylindrical body 2 has elastic force, the loading surface of the pedestal 7 is changed along the form of a loaded workpiece. When the pedestal 7 is cooled after pressing so as to coincide to a decided position with the processing face of the workpiece, the pedestal 7 is solidified just coinciding with the form of workpiece keeping the decided position, and the workpiece can be stably fixed in the suitable condition for working, processing, and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a holder for stably supporting a workpiece in a fixed position during operations such as cutting.

[Conventional technology]

2. Description of the Related Art As a conventional workpiece holder, a chuck that clamps and grips a workpiece with claws is known.

[Problem to be solved by the invention]

By the way, chucks, which are conventional holders, can reliably grip and accurately hold workpieces with constant dimensions and shapes, but they can grip workpieces with irregular shapes that vary even slightly. There is a problem in that the workpiece cannot be held stably in a fixed position because the workpiece cannot be held properly because it cannot absorb even the difference in the workpiece, which causes problems in operations such as cutting.

Therefore, the present invention has been made based on the above-mentioned circumstances, and even an irregularly shaped workpiece with variations in shape can be stably fixed in a fixed position, dramatically improving work efficiency such as cutting. The purpose is to provide a workpiece holder that can contribute to

[Means to solve the problem]

The workpiece holder of the present invention for achieving the above object includes:
A hollow cylindrical body whose lower end part fits into a recess provided in the base is molded from an elastically deformable material, and inside the hollow of this cylindrical body, a thermoplastic material that softens at 40°C to 200°C is inserted. A structural feature is that a pedestal made of a mixture of synthetic resin and an auxiliary material suitably mixed with metal powder, inorganic material, or rubber powder is accommodated. In addition, 409C to 2
It can also be configured to accommodate a pedestal made of a mixture of a thermoplastic synthetic resin that softens at 00° C. and an auxiliary material appropriately blended with metal powder, inorganic material, or rubber powder.

In place of each of the thermoplastic synthetic resins described above, a shape memory resin or a low melting point alloy having a minimum temperature of 40° C. can also be used.

As the auxiliary material, a connecting foamable resin may be used to supplement the restoring force of the cylinder or the bag.

[For production]

By arranging an appropriate number of holders of the present invention for placing the workpiece and heating the pedestal, the main material forming the pedestal will soften into a rubber-like state, so that the cylinder or bag will have elasticity. Coupled with this, the mounting surface of the pedestal on which the workpiece is placed deforms along the shape of the workpiece. If the processing surface of the workpiece is pressurized to a fixed position and then cooled, it will solidify in a deformed shape that perfectly matches the shape of the workpiece while maintaining the fixed position, allowing the workpiece to be processed. It can be stably fixed in a state suitable for use.

In addition, after the processed workpiece is removed, the pedestal is softened again by heating, so the deformed shape that was holding the workpiece is changed to the original shape of the holder due to the elastic force of the cylinder or bag. It can be restored and used repeatedly as a holder.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1(A) shows an example of a typical implementation structure of a workpiece holder according to the present invention (hereinafter referred to as "first embodiment"). That is, the holder 1 is constructed by fitting the lower end portion of a hollow cylindrical body 2 formed of an elastically deformable material such as rubber into a recess 4 of a base 3, and inserting a cylindrical body 2 with a 40 mm A receiver made of a mixture of a main material 5, such as a thermoplastic synthetic resin such as vinyl chloride resin or polyethylene, which softens into a rubber-like state in the temperature range of ℃ to 200℃, and an auxiliary material 6 such as iron powder, sand, rubber powder, etc. The stand 7 is filled and accommodated.

FIGS. 2 and 3 show examples of how the holder 1 is used, and the holder 1 is placed from above by each holder 1 fitted into an appropriate number of recesses 4 provided on the base 3. It holds the workpiece W. In the figure, reference numeral 8 denotes a fixed plate for pressurizing and setting the workpiece W in a convenient position for processing such as cutting. The cradle 7, which has been heated with hot water or high frequency waves and has become rubber-like, is deformed by pressure applied by the fixed plate 8 to fit exactly the surface of the workpiece W placed on each pedestal 7, and is processed. The workpiece W can be moved to the optimal position for the work.

As shown in FIG.
℃ or below), the pedestal 7 solidifies while maintaining its deformed state, and the workpiece can be stably held in an immovable state at the optimum position. At this time, the cylindrical body 2 made of rubber material deforms as the pedestal 7 deforms.

Here, the iron powder added to the main material 5 as the auxiliary material 6 has the role of quickly transmitting temperature to the main material 5 using the heat conduction of iron to make it react sensitively to temperature changes, and the role of the resin solidifying. It plays the role of increasing the strength in case of Therefore, the pedestal 7 is quickly softened or hardened by heating and cooling, and the hardened pedestal 7 can be maintained strong. Note that metal powder with good thermal conductivity such as aluminum powder may be used instead of iron powder.

Furthermore, the sand as the auxiliary material 6 plays a role of suppressing thermal expansion of the main material 5 and preventing changes in shape due to thermal expansion, as well as a role of increasing hardness when the resin solidifies.

Furthermore, the rubber powder as the auxiliary material 6 plays a role in improving elasticity when the resin is softened.

Therefore, the auxiliary material 6 should be appropriately mixed and used depending on the type of workpiece to be placed.

After the processing operation is completed, the workpiece W is removed from each holder 1 by heating or impact, and the pedestal 7 is softened into a rubber-like state again, and the restoring force of the cylinder 2 made of rubber material returns it to its original shape. It is used repeatedly as a holder for workpieces.

FIG. 1(B) shows a second embodiment of the present invention,
The holder 9 of the second embodiment is formed by molding a cylindrical bag body 10 whose upper and lower surfaces are thinner than the side circumferential surfaces using an elastically deformable material such as rubber.
Main material 11 that softens in the temperature range of ℃, for example, thermoplastic synthetic resin such as vinyl chloride resin or polyethylene, iron powder,
A pedestal 13 made of a mixture of auxiliary materials 12 of sand and rubber powder is filled and accommodated. A plurality of holders 9 having this configuration are arranged, and the workpiece W is placed in the same manner as in the first embodiment.
As shown in FIGS. 4 and 5, the same operation and effect as in the first embodiment can be obtained. At this time, the thickness of the rubber on the upper and lower surfaces of the bag body 10 is the same as that of the workpiece W.
It is formed to such an extent that when a workpiece is placed thereon and pressed into a fixed position by the fixed plate 8, it can be freely deformed together with the pedestal 13 in accordance with the shape of the workpiece.

In the above-described first and second embodiments, instead of the thermoplastic synthetic resin placed in the cylinder 2 or the bag 10, the lowest temperature at the transfer point is 40° C., and the thermoplastic resin is softened into a rubber-like state at the upper temperature and at the lower temperature. Even if a shape memory resin that has the property of solidifying into a resin shape is used, the same action and effect can be obtained. Further, it may be a low melting point alloy having a minimum transition point (melting point) of 40°C.

Furthermore, in the first and second embodiments described above,
A connecting foamed resin may be mixed as the auxiliary materials 6 and 12. If the connecting foam resin is inserted, the restoring force will be strengthened, and when the deformed and solidified holder softens into a rubber-like state, the pedestal 7
, 13 together with the restoring force of the cylindrical body 2 or the bag body 10, the holders 1, 9 can be quickly returned to their original shapes, and the holders can be quickly returned to a state where they can be used repeatedly.

The shapes of the cylinder 2 and the bag 10 in each embodiment are merely examples, and are not limited thereto, and may be, for example, triangular, square, or polygonal cylindrical shapes.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the following effects.

That is, the present invention is a holder equipped with a pedestal that softens with a minimum transfer point temperature of 40°C in an elastically deformable cylinder or bag, so that the workpiece placed on the heated and softened pedestal can be placed in a fixed position. When pressurized to a maximum pressure, the pedestal deforms to match the shape of the surface on which the workpiece is placed, and when it is further cooled, it solidifies while maintaining its deformed form, so the workpiece is placed perfectly in the most suitable position for processing. It is fixed with a mounting surface that matches.

Therefore, it is possible to accurately hold workpieces made of metal, ceramic, etc. with complex shapes or workpieces with uneven shapes, and coupled with the fact that they can be used repeatedly by repeated heating and cooling, This can contribute to a dramatic improvement in the efficiency of processing operations such as cutting.

[Brief explanation of the drawing]

FIG. 1(A) is a perspective view showing a first embodiment of the present invention;
Figure (B) is a partially cutaway perspective view showing the second embodiment of the present invention, Figures 2 and 3 are longitudinal sectional views showing an example of the usage state of the first embodiment, and Figures 4 and 5. FIG. 2 is a longitudinal cross-sectional view showing an example of a usage state in the second embodiment. 1...Holder, 2...Cylinder, 3...Base, 4...
・Concavity, 5... Main material, 6... Auxiliary material, 7... Rest, 9... Holder, 10... Bag body, 11... Main material,
12... Auxiliary material, 13... cradle.

Claims (1)

[Claims] 1. A hollow cylindrical body (2) whose lower end portion fits into a recess (4) provided in the base (3) is molded from an elastically deformable material, and this cylindrical body (2) ) A pedestal (7) made of a mixture of a main material (5) that softens in a temperature range of 40°C to 200°C and an auxiliary material (6) that supplements the properties of the main material (5). A workpiece holder 2 characterized by accommodating a three-dimensional bag body (1
0) is molded from an elastically deformable material, and this bag body (10)
The main material (1
1) and an auxiliary material (12) that supplements the properties of the main material (11). The workpiece holder 4 and main material (5, 11) according to claim 1 or 2, wherein 11) is a thermoplastic synthetic resin.
The workpiece holder 5 according to claim 1 or 2, wherein the main material (5, 11) is a shape memory resin, and the workpiece holder 6 according to claim 1 or 2, wherein the main material (5, 11) is a low melting point alloy. The workpiece holder according to claim 1 or 2, wherein 6 and 12) is appropriately blended with at least one of metal powder, inorganic material, rubber powder, and connected foamed resin.