JP3498952B2 - Manufacturing method of resinoid grinding wheel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resinoid grinding wheel which does not adversely affect an object to be ground by frictional heat generated during grinding. 2. Description of the Related Art Pores in a grinding wheel temporarily capture swarf generated during grinding, and are released when the wheel is separated from an object to be ground to prevent clogging of the wheel and improve sharpness. When,
It plays a very important role because it has the effect of dissipating frictional heat generated during grinding to prevent chipping and other defects in the workpiece. As typical grinding wheels, there are a resinoid grinding wheel in which the binder is made of resin and a vitrified grinding wheel in which the binder is made of ceramics. To form pores in a vitrified grinding wheel,
For example, granulated walnut shells are put in
When baked at a high temperature of 00 ° C. or more, the walnut shell is burned out and pores are formed, so that pores of a desired size can be easily formed.
However, in the case of the resinoid grindstone, since the firing temperature (heat hardening temperature) is lower than that of the vitrified grindstone, a pore-forming material such as a walnut shell cannot be used, and pore formation was not easy. As a method of forming pores in this resinoid grindstone, for example, a method in which a solid lubricant (melamine cyanurate or the like) sublimated by frictional heat during grinding is mixed into the grindstone and the pores are formed by sublimation by processing heat is used. (JP-A-6-39931). [0005] However, this has the following problems. In other words, melamine cyanurate, which is a solid lubricant, sublimes at 300 to 350 ° C, but the frictional heat generated during grinding may be close to this. In some cases, melamine cyanurate remained and required pores were not formed. For this reason, the frictional heat may increase, and the object to be ground may be chipped or the sharpness of the grinding wheel may be reduced. The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a resinoid grinding wheel capable of forming pores in the wheel by sublimation during heating and curing of the wheel. It is. That is, the present invention provides an abrasive material,
5-30 binder resins are used for 100% by mass of the abrasive.
% And naphthalene in the range of 3-20% by mass
And the binder resin is a liquid phenol resin and powder.
And a ratio of 1: 2 to 1:
Prepare the abrasive material in the liquid phenol resin
After coating with fat, the coated material and the powder
-Like phenolic resin and the above naphthalene are mixed and solidified
And that it was cured by heating in the range of 150 ° C to 200 ° C.
This is a method for producing a resinoid grinding wheel. Since naphthalene sublimates even at room temperature, sublimation is almost completed during heat curing, and the sublimated portions become pores to form pores. As a result, the contact area between the grinding wheel and the workpiece decreases,
Friction heat does not increase during grinding, and no trouble occurs on the workpiece. Next, an embodiment of the present invention will be described. The grinding wheel of the present invention comprises a mixture of an abrasive, a binder resin and naphthalene. As the abrasive, for example, alumina, silica, zirconia, or the like can be used. As the binder resin, for example, a liquid phenol resin and a powder phenol resin can be used. This binder resin is mixed in an appropriate amount, for example, in a range of 5 to 30% by mass with respect to 100% by mass of the abrasive. 8 to 2 for more appropriate amount
0% by mass. The ratio of the liquid phenol resin to the powder phenol resin can be selected in the range of 1: 2 to 1: 4. The amount of naphthalene mixed is in the range of 3 to 20% by mass with respect to 100% by mass of the abrasive. This is 3
If it is less than mass%, the formation of pores is poor and the performance of the grindstone cannot be satisfied. On the other hand, if it exceeds 20% by mass, the number of pores becomes so large that a problem arises in the strength. It has been found experimentally to be optimally between 3 and 5% by weight. Next, the case where these are mixed in a kneader will be described. First, an abrasive and a liquid phenol resin are put into a kneader, and the abrasive is coated with the liquid phenol resin. Next, another powdery phenol resin or naphthalene is charged and kneaded. The mixture thus formed is molded and solidified into a predetermined shape by a press molding machine. And finally one
If it is heated and cured in the range of 50 ° C to 200 ° C, the grinding wheel of the present invention can be obtained. If the temperature is lower than 150 ° C., the binder resin is not sufficiently cured, and if the temperature is higher than 200 ° C., the resin may be deteriorated. Therefore, such a temperature range is used. EXAMPLE An appropriate amount of silica abrasive 1 was prepared, and phenol resin 2 was 12% by mass with respect to 100% by mass of silica abrasive 1.
(3% by mass of liquid phenolic resin and 9% by mass of powdery phenolic resin) and 5% by mass of naphthalene 3 with respect to 100% by mass of silica abrasive 1 were prepared and kneaded as described above. Next, the mixture was put into a grindstone mold, press-molded, and solidified to obtain a ring having a diameter of 400 mm, an inner diameter of 270 mm, and a thickness of 100 mm. This was placed in a heating furnace and cured by heating at 180 ° C. to obtain a resinoid grinding wheel 4 of the present invention. This resinoid grinding wheel 4 was fixed to a base 5 with a rotating shaft, and a grinding test was performed. As a comparison, a similar test was performed by fixing a grindstone of the same size containing a solid lubricant made of a conventional melamine cyanurate to a base with a rotating shaft. All tests were performed in a dry manner, and the grinding surface of the grindstone was performed on the grindstone end surface 4a. Grinding object: Architectural tile axis rotation speed: 3000 rpm [Table 1] Grinding allowance 1.5mm is 1.5mm from the start of grinding.
Shows the position where mm is cut. The grinding allowance of 2.5 mm indicates a position cut by 2.5 mm from the start of grinding. As can be seen from the table, the product of the present invention is 2.5 m continuously from the start of grinding.
Although there was no problem even if it cut into m, 1.5mm
The test was stopped because the frictional heat stored increased and the chipping of the tile occurred when the temperature exceeded. As described above, according to the present invention, since the naphthalene mixed in the grindstone can sublimate during heat curing to form pores, the grindstone and the object to be ground come into contact with each other. The area is reduced, the frictional heat does not increase at the time of grinding, and problems such as chipping do not occur on the workpiece and the sharpness of the grindstone does not decrease.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a grindstone after molding and solidification of the present invention. FIG. 2 is a perspective view of a resinoid grinding grindstone of the present invention mounted on a base with a rotating shaft. ..Abrasive grains 2 ... Binder material 3 ... Naphthalene 4 ... Resinoid grinding wheel 5 ... Rotating base

Claims (1)

(57) [Claims] [Claim 1] With respect to an abrasive and 100% by mass of the abrasive,
5-30% by mass of binder resin and 3-20% of naphthalene
Mass% and the binder resin is liquid
It consists of a phenolic resin and a powdery phenolic resin.
Are prepared in the range of 1: 2 to 1: 4, and the abrasive material is
After coating with the liquid phenolic resin,
Stuffing, the powdered phenolic resin, and the naphthalene
Mixed and solidified to form
Manufacture of resinoid grinding wheels characterized by heat curing
Construction method.