JPS5894971A - Production method of super abrasive grain grindstone - Google Patents

Abstract

PURPOSE:To use a grindstone for a grinding work without scarcely requiring a truing work by providing the production method of a super abrasive grain grindstone with a uniform height. CONSTITUTION:A centrifugal casting die 1 is constituted of an upper die 2 with a pouring gate 2a and a lower die 3. Next, molten metal flows through the circular hole 8b of a grindstone base metal 8, reaches a gap, and fills the gap. When the die 1 is filled with the molten ore, it is cooled and coagulated while the die 1 is being rotated. After the molten metal is solidified, the upper die 2 is removed and a magnet base metal 8 is taken out from inside a cavity 5, and the unnecessary metal in a circular hole 8a is removed and a tape-like abrasive grain holder around the periphery is removed, thereby the grindstone fixed with super abrasive grains around the periphery of the base metal 8 by means of an abrasive grain fixing metal is obtained. Accordingly, the grindstone can be used for a grinding work without scarcely requiring a truing work.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a grinding wheel using superabrasive grains such as diamond or CBNO.

Generally, on the surface of a grinding wheel, the height of the abrasive grains a is irregular, as shown in FIG. For this reason, conventionally, truing is performed to align the height t of the abrasive grains a before use. However, using superabrasive grains such as diamond or CBN as the abrasive grains,
Therefore, there was a drawback that it required a great deal of time and effort to correct irregularities in abrasive grains by truing.

The present invention has been made for the purpose of eliminating such drawbacks, and provides a method for manufacturing a superabrasive grinding wheel with a uniform superabrasive height, which allows truing work to be carried out without the need for grinding work. It can be used as a friend.

An embodiment of the present invention will be described below in detail with reference to the drawings shown below. Figure 2 shows a centrifugal casting mold 1 used in this manufacturing method, which has a sprue 2α in the center. It consists of a disc-shaped upper mold 2 and a lower mold 3 fixed to the upper plate 2 with bolts 4. The lower W3 #'i consists of two members: a central member 3α located below the upper al12, and a peripheral portion #3b provided around the scissors central member 3a.
An intermediate cavity 5 is formed between the members 3α, 3b and the above-mentioned upper part 20, and the entire superabrasive grinding wheel is manufactured using this cavity 5 as follows.

First, with the upper mold 2 removed, a tape-like abrasive grain holder 6 made of silicone rubber or heat-resistant clay is adhered along the inner peripheral surface of the cavity 5 to a constant thickness. Next, superabrasive grains such as diamond or CEN are distributed in fractions in the abrasive grain holder 6 so that the tips of the superabrasive grains 7
Push it in so that it covers the inner peripheral surface of the cavity 5 as shown in the figure. As a result, the height of the tip of each superabrasive grain 7 becomes the same along the inner surface of the cavity 5. Next, cavity 5
Set the 8t whetstone base in the center of the wheel. The above whetstone base metal 8 is located above the center! 112 sprue 2a) Large diameter circular hole 8α
In addition, there is no disc-shaped t with multiple dovetail grooves 5Cve on the outer circumferential surface, and a plurality of runners 8b are provided inside the circular hole 8a in a radial manner toward the outer circumference. is starting to occur.

Next, in this state, cover the upper W2t on the lower part 3, and fix it with the bolt 4 so as to sew between the upper and lower molds 2 and 3, the upper mold 2, the grindstone base metal 8, and the lower part [3]. In this state, upper and lower molds 2 and 3
While rotating at a speed of t 200 to l 500 rpyx, a molten abrasive fixing metal 9 such as an aluminum pot i or wood metal is injected from the sprue 2α. The molten metal is injected into the circular hole 8Ix of the grinding wheel head (g) through the sprue 2α) and passes through the runner 8b (by centrifugal force) into the cavity 10.
reached and the empty fi+01 is filled. When the filling of the molten metal is completed, the mold is rotated 1t while the bath water is cooled and solidified. When the molten metal has solidified, the upper mold 2 is removed, the grinding wheel base metal 8 is taken out from inside the cavity 5, and the unnecessary metal in the circular hole 8α is removed. The super abrasive grains 7 are coated with metal for fixing the abrasive grains around the grinding wheel base metal 8.
is fixed, and nine grinding wheels can be obtained. The variation in the height of the superabrasive grains 7 of the grinding wheel obtained by the above method is ±
The height was within 6 μm, which was significantly smaller than the 30 to 100 μm height of conventional whetstones.

In the above embodiment, the superabrasive grains 7 were embedded after the tape-shaped abrasive grain holder 6 was attached to the inner surface of the gold cavity 5, but in advance, the superabrasive grains 7t - the holder 6t, which had been evenly embedded, was attached to the inner periphery of the cavity 5. You may also do so.

As described above, the present invention is characterized in that a superabrasive grain is held by an abrasive grain holder so that the tip of the superabrasive grain is in contact with the inner peripheral surface of the cavity of a centrifugal casting mold, and a grinding wheel is mounted in the center of the cavity. After setting the metal t 7, while rotating the metal m-1t, molten metal for grinding wheel fixation is injected into the gap between the abrasive grain holder and the outer periphery of the whetstone base using centrifugal force, and the superabrasive grains are transferred to the whetstone. Since it is fixed to the outer peripheral surface of the grinding wheel base using a metal bonding mechanism, the superabrasive grains of the obtained grinding wheel have a uniform height and can be used for grinding without the need for true ink. become able to.

This eliminates the need for truing work, which conventionally required a lot of time and effort, and also makes it possible to freely control the abrasive grain distribution.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the abrasive grain surface of a conventional grindstone, Fig. 2 is a cross-sectional view of a gold plate used in an embodiment of the present invention, and Fig. 3 is a superabrasive grain held by an abrasive grain holder. An explanatory diagram of the state, Figure 4, is an explanatory diagram of a state in which superabrasive grains are fixed to the grindstone base metal with an abrasive grain fixing metal. 1 is a mold, 5 is a cavity, 6 is an abrasive grain holder, 7 is a superabrasive grain, 8 is a grindstone base metal, 9 is a metal for fixing abrasive grains, and 10 is a void. Applicant Komatsu Ltd. Representative: Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Soeki Figure 3

Claims (1)

[Claims] The tip of the cavity 5 is attached to the inner periphery of the cavity 5 of the centrifugal casting m+ having a cavity 5 r.
After holding the super abrasive grains 7 in contact with the inner circumferential surface and setting the grinding wheel base gt in the center of the cavity 5, the above-mentioned gold W1
A molten metal 9 for fixing abrasive grains is injected into the molten metal 9 and the molten metal is transferred by centrifugal force to the outer periphery of the grinding wheel base metal 8 and the gap 1 between the abrasive grain holder 6.
At the same time, after the abrasive grain fixing metal 9 is solidified, the abrasive grain fixing metal 9 is removed from the inside of the metal product 1, and the abrasive grain holder 6 is removed from the outer periphery of the abrasive grain fixing metal 9. A method for manufacturing a superabrasive grinding wheel.