JPH08496U - Grinding wheel - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve roughness and waviness of the ground surface by improving the abrasive grain layer of a grindstone used for mirror finishing of metal. [Structure] An abrasive grain layer 2 composed of hard abrasive grains 21, a resin 22, a filler 23, and a solid material 20 is formed on the surface of a base metal 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grindstone used for mirror-finishing a surface of metal or the like.

[0002]

[Prior art]

 FIG. 2 is a vertical cross-sectional view of an example of a cup-shaped grindstone for mirror finishing. As shown in the drawing, an abrasive grain layer 2 is formed on the upper circumferential surface of a cup-shaped base metal 1 having a shaft hole 11.

As shown in an enlarged view of the essential part of the abrasive grain layer 2 in FIG. 3, a filler 23 as a solid lubricant, such as graphite, molybdenum disulfide, talc, etc., is contained in a resin 22 of heat resistance or the like. Hard abrasive grains 21 such as diamond grains and CBN (cubic boron nitride) grains are dispersed and scattered. On the surface of the abrasive grain layer 2, hard abrasive grains 21 protrude from a bond surface 24 formed by a resin 22 and a filler 23. This is a requirement for the grinding action, and during use, the bond surface 24 wears to create this condition.

An example of the composition ratio of the abrasive grain layer 2 is as follows. Abrasive grains (diamond, CBN, etc.) 54% by weight Heat resistant resin (phenol, polyamideimide, etc.) 26% by weight Filler (graphite, talc, etc.) 20% by weight

[0005]

[Problem to be solved]

 In the abrasive grain layer 2 described above, the filler 23 acts as a solid lubricant to prevent the generation of heat and reduce the coefficient of friction, but the surface roughness and surface waviness obtained by grinding are As shown in Fig. 4 (b) and Fig. 5 (b), it was not possible to obtain a sufficient mirror surface.

The work material used for the measurement of the surface roughness and the undulation of the back surface, the grinding conditions thereof, and the specifications of the grinding wheel are as follows. Work material Ferrite piece Grinding condition Machine used Vertical surface grinder Grinding wheel peripheral speed Vs = 1320 m / min Cutting speed Va = 1.8 μm / min Work piece speed Vw = 4.1 m / min Spark out 2.5 min Grinding fluid JIS W-2 type (2%) Grinding wheel shape Fig. 2 Dimensions Concentric circle width of abrasive grain layer (2) 10 mm, outer diameter 350 mm Abrasive grain layer composition Abrasive grains (diamond) 30% by weight Resin (polyamide) 30% by weight Filler (talc) 40% by weight

[0007]

[Means for Solving the Problems]

 The present invention provides a grinding wheel that solves the above-mentioned problems, and is characterized by a grinding wheel in which an abrasive layer is formed on the surface of a base metal, in which the abrasive layer is hard abrasive or oil-impregnated solid. It consists of objects, resins, and fillers.

That is, in the abrasive grain layer 2 of the present invention, as shown in the enlarged view of the abrasive grain layer 2 in FIG. 1, the surface area of the solid substance such as porous silica gel, talc, activated carbon, etc. as a lubricant is large. It is characterized by using an oil-impregnated solid material 20 in which a lubricating oil such as silicone oil is contained in a solid material that is harder than the resin that is the main body of the bond and is hard and impregnable. By doing so, the lubricating oil permeates the grinding surface during use to perform a lubricating action and a cooling action. Of course, the solid lubricating effect of the filler such as molybdenum disulfide and talc is also exhibited.

In the case of the present invention, if the amount of lubricating oil becomes excessive, molding becomes difficult, so it is necessary to keep the oil-impregnated solids 20 at about 30% by volume (about 7.5% by weight in impregnated porous silica gel). Is. The preferable range of the oil-containing porous silica gel is 3 to 5% by weight.

[0010]

【Example】

 A grinding wheel of FIG. 1 having an abrasive grain layer having the following constitution was experimentally manufactured and evaluated. The dimensions and grinding conditions of the work material grinding wheel used for this evaluation are the same as those described in the section (Problems to be solved) above. Abrasive grains (diamond) 30% by weight Resin (polyamide imide) 30% by weight Filler (talc) 35% by weight Oil-containing porous silica gel 5% by weight As a result, the surface roughness and the waviness of the surface are shown in FIG. As shown in 5 (a), it was confirmed that the surface roughness and the waviness were significantly improved as compared with the conventional grinding wheel.

[0011]

[Effect of device]

 As explained above, according to the grinding wheel of the present invention, the lubricating oil leaches out during grinding, and the surface roughness and waviness of the work material can be remarkably improved as compared with the conventional grinding wheel, and a good mirror surface can be obtained. Is obtained.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a part of an abrasive grain layer according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional cup-shaped grindstone.

FIG. 3 is an enlarged sectional view of a part of the abrasive grain layer.

4A and 4B are measurement diagrams of roughness and waviness of a ground surface of a work material ground using a grindstone of the present invention and a conventional grindstone, respectively.

5A and 5B are measurement diagrams of roughness and waviness of a ground surface of a work material ground by a grindstone of the present invention and a conventional grindstone, respectively.

[Explanation of symbols]

 1 Base metal 2 Abrasive grain layer 20 Oil-containing solid 21 Abrasive grain 22 Resin 23 Filler 24 Bond surface

Claims (3)

[Scope of utility model registration request] 1. A grinding wheel having an abrasive grain layer formed on a surface of a base metal, wherein the abrasive grain layer is composed of hard abrasive grains, oil-impregnated solid matter, resin, and filler. 2. The grinding wheel according to claim 1, wherein the oil-containing solid matter in the abrasive grain layer is 30% by volume or less. 3. The grinding wheel according to claim 1, wherein the oil-containing solid is silicon oil-impregnated porous silica gel.