JPS59115163A - Polishing machine for material of high hardness - Google Patents

Abstract

PURPOSE:To continuously supply a new polishing material so as to maintain both cutting and polishing functions for a long period, by interposing an abrasive material of diamond or the like in the gap part of a material in which iron dust particles are combined in a ventilative porous state through an iron carbide part. CONSTITUTION:When an acoustic record needle of diamond is polished by using a polishing machine A, diamond powder, being successively supplied to a surface from a ventilative hole of the polishing machine A during the work, bites mainly a mild steel part 5 rather than a cast iron part 6, and the biting powders mutually perform cutting and thermal etching with the part of a surface in the mild steel part not bitten by the powder, further existence of the cast iron part 6 causes the machining pressure to be hardly applied to the mild steel part 5 at polishing, preventing cleavage of a work and generating more effectiveness of the cutting and the thermal etching. Then the powder, being interposed in a ventilative hole of the polishing machine and successively supplied, can continuously perform work for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polishing disc made of a highly hard material having a Mohs' hardness of 9 or more, such as diamond, in which iron powder particles are bonded to air-permeable porous surfaces through iron carbide. By interposing an abrasive material such as diamond in the part, it is possible to perform both cutting and polishing functions when polishing an audio record stylus or a video disc stylus, etc., and a new abrasive material can be used. The purpose of the present invention is to provide a polishing machine for high-hardness materials that can be supplied one after another and has an extremely long life.

For example, diamond foil or a cast plate coated with diamond powder is commonly used for diamond polishing.

However, diamond foil bonded with copper or resin, as shown in Figure 1, loses its function when the diamond 1 protruding from the surface disappears, and the polishing process must be stopped and the dressing performed completely wet. Must be. Furthermore, such diamond foils can only be cut, not thermally etched (polished).

In addition, when using a cast plate coated with diamond powder, the casting of the cast plate is unstable and has large variations, so the polishing function varies widely, the polishing properties are not good, and the work is often stopped and the diamond powder is removed. Powder must be supplied. Furthermore, although thermal etching can be performed on a cast plate coated with diamond powder, it cannot be cut.

The present invention eliminates the above-mentioned drawbacks, and examples thereof will be described below.

That is, iron powder particles (which may contain about 0.1 to 0.3% carbon) have a predetermined and approximately uniform size that matches the final polishing particle size (relationship with the size of the diamond powder). ) is coated with, for example, a cellulose-based binder, and then pressurized with a mold to form a Qr constant shape.

This shaped material is placed in a furnace with a vacuum or inert gas atmosphere at a temperature of approximately 200 to 300°C, the binder attached to the iron powder particles is decomposed and carbonized, and air is created between the iron powder particles of this material. It forms porous gaps.

Then, when the furnace temperature is further raised to, for example, 800 to 950°C to cause a reaction between the iron powder particles and the carbonized carbon of the binder, that is, to perform carburization, locally a eutectic alloy is formed. , the melting point decreases, and the iron powder particles of this material combine with the surrounding iron powder particles. If the furnace temperature is lowered before this carburization is completed to the inside of the iron powder particles, this material will have a high carbon content (for example, 3 ~ Section 5), it has properties similar to cast iron, and the inside of the iron powder particles has properties similar to mild steel with a low carbon content, and it is also made of porous sintered iron. becomes.

By feeding diamond powder into the voids of the sintered iron material constructed in this way, that is, into the voids made of air permeable holes, by means of air pressure or oil solution, it is possible to create a diamond powder as shown in Figure 2. A polishing disk A for high hardness materials is obtained. In Figure 2, 5 is a mild steel part with a low carbon content, 6 is a cast iron part with a high carbon content, 7 is a ventilation hole, and 8 is a cast iron part with a high carbon content.
is diamond powder.

If the polishing disk is configured as described above, this polishing disk A
When polishing a diamond acoustic record stylus using a grinder, diamond powder is sequentially supplied to the surface from the ventilation hole of the polishing plate A during the work, and this diamond powder is distributed more to the mild steel part 5 than to the cast iron part 6. Cutting and thermal etching are mainly performed by the biting diamond powder and the part of the surface of the mild steel part that is not bitten by the diamond powder.Moreover, due to the presence of the cast iron part 6, the mild steel part 5 is not processed during polishing. It makes it difficult to apply pressure, prevents folds between the fingers,
To make cutting and thermal etching even more effective. Since the diamond powder is interposed in the ventilation holes of the polishing disc and is supplied in sequence, the work can be carried out continuously for a long time.

Then, the polishing disk A having such a configuration is attached to the holding member 9, for example, as shown in FIG. If you do this, this polishing machine will have an extremely long life without any interruption of diamond powder during operation.

As described above, the polishing disk for high-hardness materials according to the present invention has an abrasive material interposed in the voids of a material in which iron powder particles are bonded in a porous air-permeable manner via iron carbide portions. Therefore, if such a polishing disk is used to polish, for example, a diamond, both cutting and polishing can be performed at the same time, and the abrasive material is sequentially supplied to the surface from the cavity,
It eliminates the need to stop work midway through, greatly improving work efficiency, and also significantly reduces damage to the workpiece that would occur when using a cast plate during polishing work. have

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a Tiremond foil, and FIGS. 2 and 3 are explanatory diagrams of a polishing machine for high-hardness materials according to the present invention. A Polishing machine, 5. Mild steel part, 6 Cast iron part, 7 Ventilation hole (
void), 8 Diamond powder (abrasive). Patent applicant Katsu Uko, agent of Victor Japan Co., Ltd.1.゛Self-5

Claims (1)

[Claims] A polishing disk for high-hardness materials, characterized in that an abrasive material is interposed in the voids of a material in which iron powder particles are bonded in a porous air-permeable manner via iron carbide portions.