JPS61297082A - Polishiing sheet - Google Patents

Abstract

PURPOSE:To improve abrasion resistance by using a thermoplastic synthetic resin material for the basic material of a polishing sheet and dispersing abrasive grains in the whole of the structure of the molded article and allowing said abrasive grains to appear successively as the basic material is worn away. CONSTITUTION:A basic member 2 in a soft circular sheet form is obtained through the working by use of the thermoplastic synthetic resin which possesses the superior impactproofness and abrasion resistance and has a large mechanical strength such as nylon, and the abrasive grains (e.g., cerium oxide particles ) 3 are dispersed uniformly in the structure and on the surface. Further, a chip removing groove 4 in spiral or radial form is formed onto the sheet surface as the polishing surface of the basic material 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an abrasive sheet suitable for lapping and polishing, particularly for surface finishing of optical lenses and the like.

[Conventional technology]

Conventionally, abrasive sheets used for lapping or polishing surfaces such as optical glass include (1) tapes made of synthetic resin or the like with abrasive particles applied to the surface, and (2) abrasive sheets mixed with abrasive particles. (3) A type in which a foamed urethane sheet or urethane sheet is used as a lap support, and grinding is performed while injecting free abrasive grains between the lap support and the workpiece. be.

[Problem that the invention seeks to solve]

However, when using the abrasive sheet described in (1) above, the abrasive grains applied to the surface peel off in a relatively short period of time, making it unusable, and it is only used to finish the surface beautifully, but is not suitable for finishing where dimensional accuracy is an issue. Appropriate.

With the abrasive sheet (2), the workpiece was easily damaged due to poor elasticity, and the non-uniform foam structure hindered the removal of chips and caused irregular clogging. There is a problem with this.

Furthermore, with the abrasive sheet (3), it takes a long time to polish, and the work requires skill, and the environment is contaminated by scattering abrasive grains, and the equipment, including the abrasive circulation device, is damaged. There is a problem.

An object of the present invention is to provide an abrasive sheet that solves the above-mentioned problems, particularly improving the workability of lapping and polishing and the polishing performance.

[Means for solving problems]

The present invention is characterized in that abrasive grains are scattered in the structure and on the surface of a flexible thermoplastic synthetic resin sheet, and grooves for removing cuttings are formed on the entire surface of the sheet, which becomes the abrasive surface. This is an abrasive sheet.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are diagrams showing an embodiment of the present invention. The abrasive cloth 1 of the present invention has a base material 2 made of a flexible circular sheet processed using a thermoplastic synthetic resin such as nylon that has excellent impact resistance, abrasion resistance, and high mechanical strength, Abrasive grains (for example, cerium oxide particles) 3 are uniformly scattered on the surface of the sheet, and spiral or radial grooves 4 are formed on the sheet surface which becomes the polishing surface. This groove 4 serves as a groove for removing chips, and the shape of the groove is not particularly limited. Further, the thickness of the sheet is not limited in any way, and when surface precision is required, it can be formed thin to increase flexibility. Furthermore, if a long life is desired, it is possible to use a thick wall, and if one or two surface accuracy is required, it is possible to add phenol resin or the like to the nylon to give it rigidity.

The abrasive sheet of the present invention can be formed by the following method. That is, cerium oxide particles (purity 50% to 99.99%) are mixed in a copolymer of nylon 6 and nylon 12 at a ratio of 5 to 95%, and heated to 180°C or higher to melt the nylon. It is obtained by pouring the melt into a dish-shaped mold with grooves on the mold surface and solidifying it to the desired thickness.

If the amount of abrasive grains mixed is less than 5 inches, the required grinding force cannot be obtained,
On the other hand, if it exceeds 95%, the flexibility as an abrasive sheet is poor. An abrasive cloth with a diameter of 300 mm and a diameter of 300 mm with a spiral V-groove of 2% thickness, 0.2 depth, and a particle size of 1.5 μφ obtained by the above method was polished under the following conditions. The test was conducted.

0 Test conditions 1) Glass material/BK-7 (lens) surface roughness Rmax 50
0X2) Polishing machine... Oska complete set % formula % () 6) Kanzashi amplitude -15van, 122 s, p
, m7) Grinding liquid...According to the water or higher polishing test, it was possible to finish to a mirror surface of 10X or less in 5 minutes.

〔Effect of the invention〕

As described above, in the present invention, a thermoplastic synthetic resin material is used as the base material of the abrasive sheet, and abrasive grains are mixed throughout the structure of the molded body, so that new cutting edges appear one after another as the base material wears away. An abrasive cloth similar to a so-called "grinding wheel" is obtained, and grooves for removing chips can be freely provided on its abrasive surface.

In addition, the present invention uses nylon or the like as a base material to freely adjust the flexibility and elasticity required of an abrasive cloth, and it is possible to easily manufacture an abrasive sheet with excellent flexibility, elasticity, and dimensional stability. can.

Therefore, according to the present invention, it is possible to provide an abrasive sheet having a long life and excellent workability and grinding performance.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the abrasive sheet of the present invention, and FIG. 2 is a partially enlarged cross-sectional view. 1... Abrasive sheet, 2... Base material, 3... Abrasive grain, 4
・・・Concave groove (groove for removing chips)

Claims (1)

[Claims] (1) An abrasive sheet characterized by having abrasive grains scattered within the structure and on the surface of a flexible thermoplastic synthetic resin sheet, and grooves for removing chips formed over the entire surface of the sheet, which becomes the abrasive surface.