JPH04343673A - Manufacture of ultra-hard abrasive grain roll - Google Patents

Abstract

PURPOSE:To manufacture a ultra-hard abrasive grain roll used as a truer for truing a grinding wheel or as the grinding wheel while abrasive grains mixed in a metal bond layer have uniform distribution and constant density. CONSTITUTION:A ring-shaped metal base 10 spirally provided with grooves 11 with nearly the same size as the grain size of abrasive grins 5 in the peripheral direction on the plate face of the ring-shaped metal base 10 is manufactured in advance. The ultra-hard abrasive grains 5 are arranged in the grooves 11 of the metal base 10, and they are sintered in a die together with metal powder 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a super hard abrasive grain roll used as a truing wheel for a grinding machine or as the grinding wheel.

0002

[Prior Art] Conventionally, a method for manufacturing a grinding wheel for grinding or grinding using ultra-hard abrasive grains such as diamond or cubic boron nitride (CBN) has been carried out using an annular grinding wheel formed in a mold 1, as shown in FIG. Load the steel core 3 into the mold 1 so that the outer periphery of the steel core 3 corresponds to the inner periphery of the groove 2,
A mixed powder 6 made by mixing metal powder such as tin and copper with ultra-hard abrasive grains 5 is filled into the groove 2 and compressed by a pressing die 4, and the metal powder is baked by firing, hot coining or hot pressing. As shown in FIG.
The metal bond layer 7 is formed with a mixture of .

0003

[Problems to be Solved by the Invention] However, in the products manufactured by the above-mentioned conventional method, the distribution of the super hard abrasive grains 5 mixed in the metal bond layer 7 is not uniform and is arranged randomly, as shown in FIG. It is formed with uneven distribution and irregular density. Therefore, the grinding wheel for grinding that is trued with such a truer may cause feed marks, and the dressing interval may become unstable, the grinding resistance may become unstable, and grinding burn, cracks, etc. may occur. . Furthermore, there are various problems such as the work being ground into a taper or an ellipse, resulting in poor cylindrical and roundness accuracy and deteriorating the quality of the ground surface.

0004

[Means for Solving the Problems] The present invention is a method for manufacturing an ultra-hard abrasive roll that has been devised to solve the above-mentioned conventional problems. A plurality of grooves are formed at equal intervals in the circumferential direction and are approximately the same width as the ring-shaped metal base from the outer circumference to the inner circumference, and ultra-hard abrasive grains are arranged in these grooves and placed inside the mold together with the metal powder. It is characterized by being sintered.

[0005]

[Operation] By the above method, ultra-hard abrasive grains are uniformly arranged and distributed in the metal bond layer where the metal powder is fired and solidified.
Furthermore, a roll of ultra-hard abrasive grains arranged at a constant density can be obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In FIGS. 1 and 3, 10 is a ring-shaped metal base such as a copper plate. A ring-shaped metal base 10 with approximately the same width as the grain size of the abrasive grains 5 is provided on the plate surface of the metal base 10.
A plurality of arcuate grooves 11 are provided at equal intervals in the circumferential direction of the metal base 10 from the outer circumference to the inner circumference. These grooves 11 may be formed straight and radially.

[0007] The groove 11 is made of diamond or CBN.
Super hard abrasive grains 5 such as the following are arranged. The abrasive grains 5 may be arranged either outside the mold 1 or inside the mold 1 shown in FIG. In any case, the metal base 10 with the abrasive grains 5 arranged in the groove 11 is loaded into the concave groove 2 of the mold 1, and the metal powder 12 is filled thereon, and the metal powder 12 is compressed by the pressing die 4. , the metal powder 12 is sintered and solidified by firing, hot coining, hot pressing, etc.
As shown in , a metal bond layer 13 mixed with abrasive grains 5 is formed around the outer periphery of the steel core 3 .

The abrasive grains 5 mixed in the metal bond layer 13 formed by the above method are arranged in a uniform distribution along the spiral grooves 11 of the metal base 10, as shown in FIG.
Moreover, a structure consisting of spiral faults can be obtained.

Furthermore, the abrasive grains 5 arranged in the grooves 11 are
Depending on the width of the groove 11, the grain size becomes approximately constant,
By changing the spiral angle of the grooves 11, an arbitrary pattern of abrasive grain arrangement can be obtained. Note that the present invention is applicable not only to the production of grindstones for grinding workpieces, but also to the production of grindstones for grinding workpieces.

0010

Effects of the Invention As described above, the present invention provides a circular groove formed on the plate surface of a ring-shaped metal base with approximately the same width as the grain size of the abrasive grains and extending from the outer periphery to the inner periphery of the ring-shaped metal base. A simple method of arranging ultra-hard abrasive grains in the grooves at equal intervals in the circumferential direction and sintering them together with the metal powder in the mold ensures uniform distribution of the abrasive grains and a constant density. It is possible to produce a roll of ultra-hard abrasive grains with aligned grains, and has the advantage of solving various problems associated with grindstones or cutting wheels produced by conventional production methods.

[Brief explanation of the drawing]

[Figure 1] Cross-sectional view of main parts showing the method of the present invention

[Figure 2] Side view of a super hard abrasive roll manufactured by the method of the present invention

[Figure 3] Side view showing the groove shape of the metal base

[Figure 4] Front view showing the conventional manufacturing method

[Figure 5] Cross-sectional view of essential parts of a super hard abrasive roll manufactured by a conventional method

[Fig. 6] A diagram showing the abrasive grain distribution state of a super hard abrasive roll manufactured by a conventional method.

[Explanation of symbols]

1 Mold 2　Annular groove 3 Steel core 4 Holding type 5 Abrasive grains 10 Metal base 11 Spiral groove 12 Metal powder 13 Metal bond layer

Claims (1)

[Claims] [Claim 1] A plurality of grooves are provided on the plate surface of the ring-shaped metal base at equal intervals in the circumferential direction, and the width is approximately the same as the grain size of the abrasive grains, and the grooves are formed from the outer periphery to the inner periphery of the ring-shaped metal base. , A method for manufacturing an ultra-hard abrasive roll, characterized by arranging ultra-hard abrasive grains in the grooves and sintering them together with metal powder in a mold.