JPH08112768A - Regenerating method for grinding wheel - Google Patents

Abstract

PURPOSE: To prevent large change of a grinding wheel diameter further to improve an effect of bonding a regenerated grinding wheel chip, in a regenerating method for a grinding wheel of securing a grinding wheel chip by a bonding agent to the peripheral surface of a grinding wheel base material of roughing the surface. CONSTITUTION: In the case of processing a grinding wheel 1 regenerated, wherein grinding wheel chips 4 are secured through a bonding agent 3 to the peripheral surface of a grinding wheel base material 2 with a surface roughed by blast work, the grinding wheel base material 2 of the grinding wheel 1 after use is heated to soften the bonding agent 3, so as to removed the grinding wheel chips 4 after use and a layer of the bonding agent 3 from the peripheral surface of the grinding wheel base material 2. Then, a residual bonding agent 3, whose removal can not be cleared, in a surface of the grinding wheel base material 2 is removed by applying blast work in the same condition to the initial blast work condition, thereafter to secure a new grinding wheel chip 4 to the peripheral surface of the grinding wheel base material 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reclaiming a grindstone in which a grindstone base material is reused in a grindstone in which a grindstone tip is bonded to a grindstone base material.

[0002]

2. Description of the Related Art Conventionally, as in JP-A-6-71568, for example, the outer peripheral surface of a grindstone base material is roughened by shot processing or knurling, and the roughened outer peripheral surface is bonded with an adhesive. There is known a technique of increasing the bonding strength of the grindstone chip by bonding the grindstone chips.

A method of reclaiming a grindstone is also known, for example, as disclosed in JP-A-6-99358. This method removes the sintered layer (corresponding to the grinding wheel tip of the present invention) fixed to the base (corresponding to the grinding wheel base material of the present invention) by grinding, cutting, laser machining, or chemical dissolution, and the processed surface The base is reused by fixing a new sintered layer on the base.

[0004]

By the way, when the outer peripheral surface of the grindstone base material is roughened and the grindstone tips are fixed as in the former case, the latter technique is adopted to reuse the grindstone base material. There was an inconvenience when trying to achieve. That is, even if the grindstone tip is peeled off, the adhesive remains in the recessed portion of the roughened outer peripheral surface, and if it is attempted to remove this by machining, it is necessary to scrape the surface of the grindstone base material and the grindstone diameter changes. However, there is a problem that a waste liquid or the like needs to be treated if it is removed by chemical dissolution or chemical dissolution.

[0005]

In order to solve the above-mentioned problems, the present invention provides a method for reclaiming a grindstone in which a grindstone tip is fixed to an outer peripheral surface of a roughened grindstone base material with an adhesive. The grindstone base material of the used grindstone in the process is heated to soften the adhesive, and the used grindstone chip and the adhesive layer are removed from the outer peripheral surface of the grindstone base material in the removal process and also removed in this removal process. Residual adhesive on the surface of the grinding stone base material that could not be completely removed was removed in the blasting process, and a new grinding stone chip was fixed to the outer peripheral surface of the grinding stone base material after the blasting processing in the fixing process. Then, the initial roughening of the outer peripheral surface of the grindstone base material was performed by blasting, and the blasting conditions in the blasting process accompanying the regeneration treatment were made the same as the initial blasting conditions.

[0006]

After the adhesive is softened in the heating step, the used grindstone chips and the adhesive are peeled off in the removing step, whereby the adhesive can be easily removed. At this time, since the adhesive remains mainly in the recesses on the outer peripheral surface of the grindstone base material, if the blast processing is performed on the outer peripheral surface after cooling the grindstone base material, the adhesive deteriorates due to heating, so it is easy. To be removed. In addition, a new uneven surface is formed on the outer peripheral surface of the grinding stone base material by blasting, and the effect of adhering a new grinding stone tip is increased. At this time, the blasting process makes it easier to control the size of the grindstone as compared with the case of machining the outer peripheral surface of the grindstone base material. Further, by making the initial blasting condition and the blasting condition associated with the regeneration treatment the same, it is possible to cleanly remove the residual adhesive and to process the surface roughness so that the adhesive effect of a new grindstone tip is enhanced.

[0007]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a perspective view of a grindstone, FIG. 2 is a partial view seen from the front, and FIG. 3 is a partial view of a used grindstone. The method for reclaiming a grindstone of the present invention is such that, in a grindstone 1 as shown in FIG. Multiple arcuate whetstone chips 4, ...
When it has been used up to a predetermined thickness, the used grindstone chips 4, ... And three layers of the adhesive are peeled off, and new grindstone chips 4 ,. 2 is to be reused.

At this time, the outer peripheral surface of the grindstone base material 2 is coated with the adhesive 3
The surface is roughened by blasting, which will be described later, in order to enhance the adhesive effect. Further, the grindstone tip 4 is made of abrasive grains having high hardness, such as cubic boron nitride (CBN) or diamond, which are bonded and held by a binder such as vitrified bond, and has a thickness shown in FIG. 2 before use, for example. When t is about 3 mm and the thickness t is reduced to about 0.5 mm as shown in FIG. 3, it is treated as used.
The thickness s of the three layers of adhesive is also set to about 0.5 mm.

Therefore, the reprocessing method of the present invention will be described with reference to FIGS. 4 and 5. Here, FIG. 4 is an example view showing a procedure for peeling the used grindstone tip 4 and the adhesive 3 layer, and FIG. 5 is an enlarged view of the surface of the grindstone base material 2. The used grindstone is inspected after cleaning. This inspection is performed for the presence / absence of cracks in the grinding stone base material 2 or the presence / absence of dimensional abnormality, and it is determined whether or not the grinding stone base material 2 can be reused.

If there is no abnormality, the grinding stone base material 2 is heated to soften the adhesive of the three layers of adhesive. This heating temperature is a temperature that can soften the adhesive and does not give a heat load to the grinding stone base material 2, for example, about 150 ° C., and the used grinding stone chips 4 can be easily peeled off by heating to this temperature. It can be removed, and the adhesive 3 can be deteriorated when it is naturally cooled thereafter.

When the adhesive 3 is softened by heating, as shown in FIG. 4, the used grindstone tip 4 and the adhesive 3 layer are removed by using a peeling tool 5 such as a chisel or a cutter. At this time, since the three layers of the adhesive are softened, they can be easily peeled off. However, since the outer peripheral surface of the grindstone base material 2 is roughened in a concavo-convex shape as shown in FIG. 5, the three-layered adhesive agent in the state shown in FIG. 5A before being removed by the peeling tool 5 is used. Remains as the residual adhesive 3 mainly in the recess as shown in (B) even after being removed by the peeling tool 5,
It cannot be completely removed only by the peeling tool 5.

Therefore, in the present invention, after the removal work is completed, it is naturally cooled, and then, as shown in (C), a blasting process is performed to spray the shot material 6 toward the outer peripheral surface of the grindstone base material 2 and the residual adhesive 3 is applied. Get rid of. The shot material 6 is, for example, a fused alumina abrasive material having a Mohs hardness of 7 or more and a toughness that is hard to be crushed by an impact, and the grain size is about 24 mesh size.

By the way, the blasting conditions (type of blast material, grain size, blasting speed, etc.) of this blasting are the same as the blasting conditions when the outer peripheral surface of the grindstone base material 2 was roughened. That is, in the initial blasting process, a fused alumina abrasive with a mesh size of about 24 was used,
The outer peripheral surface of the grinding stone base material 2 is roughened to have a surface roughness of 10 μ to 50 μ. It has been confirmed that the range of the surface roughness can substantially increase the adhesive strength of the adhesive 3. By the way, when an abrasive material having a mesh size of about 150 and a small grain size is used, the surface roughness is about 7 μ, and the adhesive effect is inferior to the case where the surface roughness is 10 μ to 50 μ.

In the blasting process for removing the residual adhesive 3, the conditions of the shot material 6 and the like are made to be the same as the initial conditions. That is, when the mesh size of the shot material 6 is increased, the residual material remains in the recess. This is because the adhesive 3 is likely to remain on the bottom of the recess, etc., and if the mesh size is reduced, the surface tends to be smooth, and the subsequent adhesive effect is reduced. Therefore, if the other blasting conditions other than the mesh size are processed under the same conditions as the original blasting conditions, the residual adhesive 3 is removed cleanly as shown in (D), and the original surface roughness Same surface roughness (10 ~ 5
0 μ) can be used for roughening.

After the blasting is finished, the grindstone base material 2 is washed and a new grindstone tip 4 is fixed with the adhesive 3. For this adhesion, for example, the grindstone chip 4 is pressure-bonded onto the adhesive 3 applied to the outer peripheral surface of the grindstone base material 2, and this is bonded at 90 ° C. for 6
Heat for about an hour to cure. With such an adhesion method, it is possible to obtain the same strength as a new grindstone with an adhesion strength of 550 kg / cm ² or more.

When the above-mentioned method is used, it is easier to control the size of the grindstone diameter as compared with machining, the residual adhesive 3 can be removed cleanly by blasting, and the outer peripheral surface of the grindstone base material 2 can be removed. The new concavo-convex surface thus formed provides a new and adhesive effect. Moreover, there is no problem of waste liquid that is chemically dissolved.

[0017]

As described above, in the method for reclaiming a grindstone of the present invention, when reclaiming a grindstone in which a grindstone chip is bonded to the outer peripheral surface of a roughened grindstone base material, the grindstone base material is heated to remove the adhesive. After softening and removing the grindstone tip and the adhesive, the residual adhesive was removed by blasting, and at the same time the roughening was performed to maintain the adhesive strength of the new grindstone tip.
It is possible to efficiently and efficiently perform the reclaiming process of the grindstone. Further, it is easier to control the diameter of the grindstone as compared with the case where the outer peripheral surface of the grindstone base material is machined and regenerated. At this time, by making the blasting conditions the same as the initial blasting conditions, it is possible to cleanly remove the residual adhesive and to firmly bond a new grindstone tip.

[Brief description of drawings]

1] Perspective view of a grindstone

[Figure 2] Partial view of the whetstone seen from the front

[Fig. 3] Partial view of used grindstone

FIG. 4 is an example of removing a grindstone tip.

FIG. 5 is an enlarged view of an outer surface of a roughened grinding stone base material,
(A) is a state diagram before removing the grindstone tip, (B) is a state diagram in which residual adhesive remains, (C) is a state diagram before blasting, and (D) is a state diagram after blasting

[Explanation of symbols]

1 ... Whetstone, 2 ... Whetstone base material, 3 ... Adhesive, 4 ... Whetstone tip

Claims (2)

[Claims] 1. A method of reclaiming a grindstone in which a grindstone tip is fixed to an outer peripheral surface of a roughened grindstone base material with an adhesive, whereby the grindstone base material of a used grindstone is heated to soften the adhesive. Heating process, removing step to remove used grindstone chips and adhesive layer from the outer peripheral surface of the grindstone base material, and removing residual adhesive on the surface of the grindstone base material that could not be completely removed by the removing step by blasting A method of reclaiming a grindstone, comprising: a blasting step of: and a fixing step of fixing a new grindstone tip to an outer peripheral surface of the grindstone base material after the blasting. 2. The method for reclaiming a grindstone according to claim 1, wherein the roughening of the initial outer peripheral surface of the grindstone base material is performed by blasting, and the blasting conditions of the blasting step associated with reclaiming are set. A method for reclaiming a whetstone, which is characterized in that the initial blasting conditions are the same.