JPS5851074A - Method of manufacturing ultra-abrasive grindstone - Google Patents

Abstract

PURPOSE:To obtain always a stable grinding characteristic even if the grinding layer of a grindstone is worn out, by radially directing numerous needle pellets in the direction toward the center of a grindstone base metal with the use of a magnet, and then by filling a bonding agent thereto and calcining thereof so that an ultraabrasive is uniformly distributed. CONSTITUTION:In a method of manufacturing an ultra-abrasive grindstone having a uniform abrasive distribution, needle pellets 1 are produced at the first step. Each pellet 1 is such that ultra-abrasive particles 4 are bonded, in an equally spaced relation, to a pure iron thin wire 2 having a length corresponding to the thickness of a grinding layer, with the use of a resinoid bond 3. Then, the pellets 1 are embeded at equal piches on a tape-like metal foil as at the second step. Such a metal foil is bonded to the internal peripheral surface of a metal die by means of a bonding agent or the like. Further, magnets are arranged to the periphery of the die and the center part of a grindstone base metal, respectively. In this stage, the base metal and the pellets are calcined after a bonding agent is filled into the die. Accordingly, a stable grinding characteristics may be always obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a superabrasive grinding wheel having a uniform abrasive grain distribution.

Conventional grinding wheels using superabrasive grains such as Diamond Yarn CBN have had the drawback of unstable grinding performance due to uneven distribution of abrasive grains.

This invention has been made to overcome these drawbacks, and provides a method for manufacturing a superabrasive grinding wheel with uniform abrasive grain distribution, thereby facilitating the production of a superabrasive grinding wheel with stable grinding performance. It was made so that it could be obtained.

Detailed description will be given below with reference to an embodiment of the present invention. First, as a first step, a needle-like pellet 1 is manufactured. Needle-like pellets made by one manufacturer of pure iron fine H (@diameter α) with a length equivalent to the thickness of the grinding layer.
l -0,2g) 24C As shown in Figure 1 GOK, use resinoid bond 3 to adhere superabrasive grains 4 at equal intervals, or as shown in Figure 1 (B) K, use the same pure iron fine wire as above. 2, the superabrasive grains 4 are held in the plating layer 5 and deposited at equal intervals.

Next, as a second step, the needle-shaped pellet 1 manufactured by the above method is applied to the tape-shaped metal foil 6-, which has the same width I/c#t of the grinding layer a, in multiple strips at intervals of about 1 inch. Plant (Second
(See figures (f) and (b)). The spacing between each row is about one, and the wires are placed on the metal foil 6 by spot welding one end of the fine pure iron wire 2 to the metal foil 6.

Next, the metal foil 6 obtained in the second step is attached to the inner circumferential surface of the mold 7 shown in FIG. 3 by adhesive or other means. A grinding wheel base metal A is positioned in advance in the center of the mold 7,
When the metal foil 6 is attached to the inner surface of the metal foil, the needle-like pellets 1 are positioned around the entire surface of the grindstone head. In addition, electromagnets 8 are installed around the metal foil 6 and in the center of the grindstone head, and when these electromagnets 8 are energized after bonding the metal foil 6, the pure iron fine wire 2 is generated by the lines of magnetic force generated between the two electromagnets 80. As a result of suction, the needle-like pellets) are directed radially toward the center of the grinding wheel head.

Next, in this state, a bonding agent is injected into the mold 7, and then the entire mold 7 is put into a heating furnace to sinter the bonding agent. After the bonding agent has hardened (by sintering), wait for it to cool down, remove the mold holder, remove the metal foil from the grinding wheel, and remove the metal foil 6 that is glued around the bonding agent. It is possible to obtain a superabrasive grinding wheel having a grinding layer 1 in which superabrasive grains 4 are uniformly distributed around the entire surface of the grinding wheel head as shown in the figure.

As described in detail above, this invention involves planting a large number of needle-like pellets to which superabrasive grains have been glued at equal intervals on a metal foil, and placing the metal foil inside a mold loaded with a grinding wheel base metal. After adhering to the peripheral surface and directing the above-mentioned large number of needle-shaped pellets radially toward the center of the grinding wheel base using magnetic force, a bonding agent is filled,
By sintering this, the grinding layer of the resulting grinding wheel has superabrasive grains uniformly distributed and bonded with a bonding agent, so even if the grinding layer is worn out during grinding, it will always be K to obtain stable grinding performance.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and are shown in Fig. 10) and (→
is an explanatory diagram of the needle-shaped pellets, Figure 2 (f) is a perspective view of the needle-shaped pellets embedded in metal foil, Figure 2 (b) is a plan view of the same, and Figure 3 is the metal foil placed in a mold. FIG. 4 is a cross-sectional view of the obtained grinding wheel in a state where it is installed inside. 1 is a needle-like pellet, 2 is a fine pure iron wire, 4 is a super abrasive grain, 6 is a metal foil, F is a mold, 1 is a grinding wheel base metal, and 1 is a grinding layer. Patent attorney Bookbinding, Tadashi

Claims (1)

[Claims] Super abrasive grains 4 are adhered to pure iron fine wire 2 at regular intervals to form needle-like pellets, and after planting a large number of needle-like pellets 1 on metal foil 6 at equal pitches, the metal foil 6 is placed on a grindstone head. Attach the metal A to the inner peripheral surface of the metal part 7, and then use the magnetic force directed toward the center of the grinding wheel base metal A to direct the needle-like pellets 1 radially toward the center of the entire grinding wheel base to ensure a good condition. A method for manufacturing a super-abrasive grinding wheel, characterized by filling a mold with a pounding agent and then sintering the same.