JPH08197431A - Manufacture of electrodeposition grinding wheel for compound gringing - Google Patents

Abstract

PURPOSE: To extend the life of a composite grinding wheel by reducing the difference of the wearing speed of abrasive grains of each part of a grinding wheel to be ground on different grinding conditions. CONSTITUTION: This grinding wheel grinds parts to be ground W1, W2 and W3 on different conditions at the same time. When a grinding wheel part 3 grinding the part to be ground W3 and grinding wheel parts 2, 3 grinding the parts to be ground W2, W3 are integrally molded into a composite electrodeposition grinding wheel, the mother material of the grinding wheel parts 2, 3 is made larger in their outer diameters according to the initial wearing speed of abrasive grains of the parts to be ground W2, W3 and after the abrasive grains are electrodeposited, it is dressed in their outer diameters by the enlarged size to be the required outer diameter of each grinding wheel part 2, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an electro-deposition grindstone for compound grinding, in which grindstone portions for grinding respective grinding portions formed on a grinding work and having different grinding conditions are integrally formed.

[0002]

2. Description of the Related Art Depending on the ground work, the grinding conditions such as the hardness of the ground portion, the peripheral speed of the grindstone, the surface roughness of the ground portion after processing, etc. may differ for each ground portion of the work. In the case of grinding a grinding work having grinding parts having different grinding conditions, it is conceivable to grind each grinding part sequentially in a separate process, but this increases the number of working steps. Therefore, an electro-deposition grindstone for compound grinding in which a grindstone portion for grinding each grinded portion is integrally formed is used to simultaneously grind each grinded portion in one step.

[0003]

By the way, since the abrasive grains as electrodeposited have a sharp tip or the tip positions are not uniform, the abrasion rate of the abrasive grains increases until a predetermined amount of machining is performed after the start of machining. Initial wear that is fast and has an unstable wear rate occurs, then wears steadily, and finally reaches the end of its life. Here, if the grinding conditions are different, the initial wear amount is different, and a deviation occurs in the outer diameter dimension of the grindstone portion where the grinding conditions are different. As mentioned above, if each grindstone part is formed integrally,
If the initial wear amount of the abrasive grains differs for each grindstone part, and there is a deviation between the outer diameter dimensions of each grindstone part, even if there is still room to grind from the viewpoint of each grindstone part, after grinding each grind part The dimensional tolerance cannot be satisfied and the composite whetstone cannot be used any more.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method of manufacturing an electrodeposition grindstone for compound grinding, which has a long life in order to solve the above-mentioned problems.

[0005]

In order to achieve the above object, the present invention is for compound grinding in which each grindstone portion for grinding each grinding portion formed on a grinding work and having different grinding conditions is integrally formed. In the method of manufacturing the electrodeposition grindstone, the initial wear amount at which the wear rate of the abrasive grains becomes relatively large for each grindstone portion is obtained, and the outer diameter of the grindstone base material is increased for each grindstone portion by this initial wear amount. It is characterized in that after the abrasive grains are electrodeposited, the grinding stone base material is shaped by an amount corresponding to a larger size so that the outer diameter of each grinding stone portion becomes a predetermined dimension.

[0006]

[Function] By shaping an amount corresponding to the initial wear amount for each grindstone portion, it is possible to prevent the initial wear whose wear rate is unstable after the start of machining from occurring, and to cause a deviation between the outer diameter dimensions of each grindstone portion. Try not to. Since the outer diameter dimension of the grindstone portion after shaping needs to be a predetermined dimension, the outer diameter dimension of the grindstone base material is increased in advance by the formation amount, and the outer diameter dimension of the whetstone portion is adjusted to a predetermined dimension after shaping. I tried to be.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, W is a grinding work, which is a component of a constant velocity joint for transmitting a driving force of an engine to wheels of an automobile. The ground work W is forged and then gradually cooled and adjusted to a hardness of about HRC25 to 46. For example, a spline or the like is provided in a range WH. Heat and quench to HRC 58-63. W1 is a part where the end of the inner race of a bearing (not shown) fitted to the grinding work W is abutted, and is processed after induction hardening so that the surface roughness becomes 6.3S. W2 is a portion where the tip of an annular dust-proof seal attached to the outer race side of the bearing slides, and is processed after induction hardening so that the surface roughness becomes 12.5S. Further, W3 is a portion to which the wheel speed detecting gear is press-fitted and fixed, so that quenching is not necessary and the surface roughness of about 25S is sufficient. In this way, the grindstone portion 2 for grinding the hardened grinding portions W1 and W2 and the grindstone portion 3 for grinding the unhardened grinding portion W3 are integrally formed, and the compound grindstone for plunge cutting by cutting in the L direction. It was set to 1. Further, in order to increase the surface roughness of the ground portions W1 and W2, the mesh for classifying the abrasive grains is 1
Abrasive grains having a relatively small grain size of 40/170 are electrodeposited on the grindstone portion 2. On the other hand, in the ground portion W3, coarse abrasive grains having a relatively large grain size of 100/120 are electrodeposited on the grindstone portion 3 so that the chips are not clogged between the electrodeposited abrasive grains.

Grinding due to the difference in hardness between the grinding portions W1 and W2 and the grinding portion W3 and the difference in particle diameter between the abrasive grains electrodeposited on the grindstone portion 2 and the abrasive grains electrodeposited on the grindstone portion 3 and the like. The abrasive grains and the grindstone portion 3 that are electrodeposited on the grindstone portion 2 due to the different conditions
The difference in the amount of wear from the abrasive grains electrodeposited on the substrate will be described with reference to FIG. In FIG. 2, the vertical axis represents the amount of wear and the horizontal axis represents the number of grinding workpieces W processed. Also, A indicates the abrasion amount of the abrasive grains of 100/120, and B indicates 140/1.
The abrasion amount of 70 abrasive grains is shown. As shown in the figure, the amount of wear of the abrasive grains electrodeposited on the grindstone portion 3 shown in A is larger than that of the abrasive grains electrodeposited on the grindstone portion 2 shown in B. By the way, both whetstone parts 2
・ If 3 is formed integrally, the problem is that both whetstone parts 2
-The difference in the wear rate of the abrasive grains electrodeposited on # 3. If the difference in wear rate of the abrasive grains electrodeposited on both the grindstone portions 2 and 3 is small, the grinding portion W1
The dimensions of W2 and the grinding portion W3 can both be within the tolerance range, but if the abrasive grains electrodeposited on one of the grindstone parts wear quickly, the cutting amount of the composite grindstone 1 cannot be adjusted. is there. Therefore, as indicated by AB in FIG. 3, which shows the difference in wear rate between A and B, the difference in wear rate of the abrasive grains of both grindstone portions 2 and 3 is large, and therefore both grindstone portions 2 and 3 can withstand use sufficiently. Even in the state, it becomes impossible to satisfy both the dimensional accuracy of the ground portions W1 and W2 and the dimensional accuracy of the ground portion W3, and the composite grindstone 1 itself cannot be used any more.

In this case, as shown in FIG.
With respect to the 00/120 abrasive grains, initial wear occurs in which the wear rate is high and the wear rate is unstable until a predetermined number of Na processes. Therefore, the initial wear amount is Ta as shown in a1.
become. Further, regarding the abrasive grains of 140/170 shown in B, the wear rate is high until the predetermined number of Nb processing, and the initial wear is unstable. Therefore, the initial wear amount is Tb as shown by b1. It should be noted that, while these initial wears occur, that is, A is up to Na and B is up to Nb in FIG. 2, the wear rate is unstable because the wear rate is actually unstable. Increases stepwise.

Then, Ta is applied to each of the grindstone portions 2 and 3.
And Tb, and a1 and b1 are made to coincide with the processing start time S. That is, the change in the amount of wear of the abrasive grains of the grindstone portion 2 is changed from the state A to the state a and the state is changed from the state B to the state b, so that the change in the wear amount after the start of the machining is changed between the two whetstone portions 2.3. Synchronize them so that they are approximately equal,
The difference in wear rate of the abrasive grains electrodeposited on 3 was made small as indicated by ab in FIG. 3, which shows the difference in wear rate between a and b.

In addition, as for the grinding stone base material of the grinding stone portion 2, T
b, the outer circumference of the grinding stone base material of the grinding stone portion 3 is formed to be large, and the outer diameter of each of the grinding stone portions 2 and 3 after shaping is set to a predetermined dimension.

[0012]

As is apparent from the above description, according to the present invention, the difference in the wear rate of the abrasive grains of each grindstone portion for grinding the grinding portion having different grinding conditions is shortened, whereby the life as a composite grindstone is shortened. Can be extended.

[Brief description of drawings]

FIG. 1 is a diagram showing a grinding state by an electrodeposition grindstone for compound grinding of the present invention.

FIG. 2 is a diagram showing the difference in the change in the amount of wear of the abrasive grains of each grindstone portion.

FIG. 3 is a diagram showing a difference in wear rate difference before and after truing.

[Explanation of symbols]

 1 Compound grindstone 2 Grindstone part 3 Grindstone part W Grinding work WH Induction hardening range A Curve of wear amount of abrasive grains of mesh 100/120 B Curve of wear amount of abrasive grains of mesh 140/170 a After truing of A Change curve of wear amount b Change curve of wear amount after truing of B AB Change curve of difference in wear speed between A and B a Change curve of difference in wear speed between a b and a

Claims (1)

[Claims] 1. A method of manufacturing an electrodeposition grindstone for compound grinding, wherein grindstone portions for grinding respective grinded portions formed on a grinding work and having different grinding conditions are integrally formed. Obtain the initial wear amount at which the speed becomes relatively large, increase the outer diameter of the grinding wheel base metal for each grinding wheel portion by this initial wear amount, and shape by the size of the grinding wheel base material after electrodeposition of the abrasive grains. A method for manufacturing an electrodeposited grindstone for compound grinding, wherein the outer diameter of each grindstone is set to a predetermined value.