JPS6246314B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a processing tool for ultra-precision grinding.

Conventionally, the inner surface of a mold manufactured by electric discharge machining or the like has relatively rough machining accuracy, so that the final superfinishing has been done manually. Therefore, work efficiency was extremely poor. Therefore, the applicant has invented a method for accurately machining, for example, acute corners without rounding, and has already filed an application for a machining device used in this machining method. Generally speaking, this processing device applies a rotational motion signature vibration of a minute radius to a processing tool, and this processing tool repeatedly collides with the inner circumferential surface of a portion of the workpiece to perform grinding. This is what I did.

As described above, the present invention provides a novel machining tool that performs grinding by applying microvibrations to the machining tool, and a method for manufacturing the same. Hereinafter, the embodiment will be described in detail using the drawings.

Machining tool 1 manufactured by the method of the present invention
In this example, a tool portion 9 having substantially the same shape as the workpiece portion 7 of the workpiece 5 is integrally fixed to the tip of the shank 3. At the tip of the shank 3 in the processing tool 1, as shown in FIG.
An appropriate number of circumferential grooves 3a of an appropriate shape are formed, and an axial plane portion 3b is also formed. The circumferential groove 3a prevents the tool portion 9 from moving in the axial direction with respect to the shank 3, and
b is for preventing rotation of the tool part 9 with respect to the shank 3. In addition, in order to restrict the movement of the tool part 9 in the axial direction and rotational direction with respect to the shank 3, it is also possible to provide a configuration in which a pin is provided at the tip of the shank 3 in a direction perpendicular to the axial direction.

Next, a method of manufacturing the processing tool 1 will be explained. First, when the workpiece 7 of the workpiece 5 is a through hole, a suitable plate is applied to the back surface. Next, a shank 3 is placed approximately in the center of the workpiece 7.
position. Thereafter, an appropriate resin is injected into the processed portion 7 and hardened until the circumferential groove 3a of the shank 3 is buried. This resin becomes the tool part, and after the resin is hardened and integrated with the shank 3, the machining tool 1 is manufactured by extracting the shank 3 from the workpiece part 7. The resin desirably has a relatively large shrinkage rate upon curing, and for example, urethane rubber or silicone rubber can be used. In addition, resins that do not have a very large shrinkage rate during curing (for example, product name: Rigoratsu, sample embedding resin)
No. 101) etc., in advance a thin coating (for example,
It is desirable to form a film (product name: Mamacoat, CM-COLOR) and remove this film later to create a minute gap between the tool part 9 and the inner surface of the workpiece part 7. It is something.

The machining tool 1 manufactured by the method described above has its shank 3 mounted on a machining device, and is subjected to rotational motion (fine vibration) of a minute radius. Therefore, the tool part 9 vibrates slightly within the workpiece part 7 of the workpiece 5. Therefore, by interposing a lapping agent such as diamond grains or abrasive grains between the tool part 9 and the workpiece part 7, the workpiece part 7 can be ground with ultra-precision. When manufacturing the processing tool 1, before injecting the resin into the part to be processed 7, a lapping agent is applied to the inner surface of the part to be processed 7 in advance, and the resin and the lapping agent are integrated to form the tool part. It is also possible to adopt an embodiment in which a wrapping agent is contained on the surface of 9.

As can be understood from the above description of the embodiments, the gist of the present invention is that, as stated in the claims, the tool portion of the processing tool is made by applying resin to the processing portion where ultra-precise grinding is to be performed. Since it is manufactured by injection, even if the part to be processed has a complicated shape, it can be easily manufactured regardless of the shape.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented by other methods by making appropriate changes. For example, it is possible to integrally fix the shank with an adhesive after the resin has hardened, or to insert and fix the shank after drilling a hole in the resin.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a machining tool manufactured by the method of the present invention, FIG. 2 is a perspective view of a workpiece, and FIG. 3 is a perspective view of a shank. (Explanation of symbols representing main parts of drawings), 3
...Shank, 5...Work material, 7...Work part, 9...Tool part.

Claims (1)

[Claims] 1. A method for manufacturing a processing tool for ultra-precision grinding, characterized by comprising the following steps. (a) The process of positioning the shank into the workpiece of the workpiece. (b) A step of injecting resin into the processed portion to harden the resin and integrating it with the shank. (c) Process of extracting the resin integrated with the shank from the workpiece. 2. The method for manufacturing a machining tool according to claim 1, characterized in that before injecting the resin into the workpiece, a thin film is previously formed on the inner surface of the workpiece. 3. The method for manufacturing a machining tool according to claim 1, characterized in that before injecting the resin into the workpiece, a rapping agent is applied in advance to the inner surface of the workpiece.