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Method for producing vitrified diamond whetstone

A manufacturing method and vitrification technology, applied in the manufacture of tools, abrasives, grinding devices, etc., can solve the problems of inability to sinter, insufficient retention of diamond abrasive grains, unusable borosilicate glass, etc., and achieve improved durability. Effect

Inactive Publication Date: 2011-01-19
KURE GRINDING WHEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, borosilicate glass cannot be used at a firing temperature of 650°C or less
[0016] According to the above aspects, in order to obtain a vitrified diamond grinding stone with durability and good sharpness, it is necessary to match the good adhesion and thermal expansion coefficient with the diamond abrasive grains. As a vitrified adhesive that satisfies these conditions, use Borosilicate glass used together with CBN abrasive grains, however, has a problem of insufficient retention of diamond abrasive grains during firing in a nitrogen atmosphere
[0017] In addition, among the vitrified adhesives of the prior art described above, there are materials that cannot be used due to environmental problems, or materials that can be fired at a low temperature of 650° C. or less, but have insufficient abrasive grain holding power.
[0018] In short, in order to improve the retention of abrasive grains, it is necessary to match the coefficient of thermal expansion of the abrasive grains and the vitrified binder and to have good fluidity. However, in the case of diamond abrasive grains, they are generally inert and bond with other substances. Poor adhesion, i.e., no bonding structure formed by chemical reactions can be obtained
In an air atmosphere, there is a problem that it cannot be fired in an air atmosphere because it causes a rapid weight loss when heated to 650°C or higher.
[0019] In addition, when using a vitrified binder with a low softening point of 650°C or less, the coefficient of thermal expansion does not match in firing at 650°C or less
In addition, if the binder is used for firing at 650°C or higher, there will be a problem of expansion of the grinding stone.

Method used

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  • Method for producing vitrified diamond whetstone
  • Method for producing vitrified diamond whetstone
  • Method for producing vitrified diamond whetstone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] [Heating test of diamond abrasive grains]

[0057] The diamond abrasive grains were heated to a high temperature, and weight loss due to heating was confirmed.

[0058] (heating test 1)

[0059] The following heating test was performed on diamond abrasive grains of MBG660 mesh 120 / 140 manufactured by GE.

[0060] Conditions for heating test

[0061] Put 2 g of the abrasive grains into a platinum crucible, and keep them at the highest retention temperatures of 580°C, 630°C, 700°C, 800°C, 850°C, and 950°C for 7 hours in an air atmosphere. The heating survival rate was calculated from the weight change after heating. The test results are shown in Table 1.

[0062] [Table 1]

[0063] test temperature

[0064]As shown in Table 1, although it will be completely burned at 950°C, 72.5% will remain at 800°C, and 61.5% will remain at 850°C, at least not as described in the prior art (Non-Patent Document 1) It is completely destroyed at 800°C. Regarding the heat...

Embodiment 3

[0149] The reduction rate of the grindstone of Example 3 after firing was about 1% higher than that of Comparative Example 3 and Comparative Example 4. That is, in the manufacturing process of Example 3, diamond abrasive grains were easily burnt. The burning loss of the diamond is caused during the heating process of the sintering temperature. Surprisingly, controlling the properties of the binder and the change of the abrasive grain surface during the heating will help the wettability between them And the improvement of adhesiveness can concretely be demonstrated as follows.

[0150] The burning loss of diamond depends on the softening point of the binder. For example, the vitrified binder used in Example 3 has a softening point of 800°C. During the process of raising the firing temperature to a final temperature of 850°C, until the firing temperature exceeds the softening point of 800°C, the diamond abrasive grains Most of the surface can be exposed to the air atmosphere. ...

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Abstract

Disclosed is a method for producing a durable vitrified diamond whetstone with good sharpening performance through firing at 650 1 / 2 C or higher in the air atmosphere. Specifically, a method for producing a vitrified diamond whetstone comprising a step for firing a mixture of a vitrified binder and diamond abrasive grains in the air atmosphere is characterized in that the mixture contains a vitrified binder having a softening point higher than 650 1 / 2 C and the mixture is fired at 700-900 1 / 2 C in the air atmosphere.

Description

technical field [0001] The present invention relates to a method for manufacturing a diamond grinding stone bonded with a vitrified binder. Background technique [0002] In the past, vitrified diamond whetstone was fired under nitrogen atmosphere. The reason is that if the diamond abrasive grains are heated in the air, the weight of the abrasive grains will decrease sharply from a temperature of 650°C or higher, and the diamond abrasive grains will burn and disappear at around 800°C. The reason is considered to be that it reacts with oxygen in the air to produce carbon dioxide gas, which is simply burnt off (Machinery and Tools, January 1985, P156; this data is quoted from R.C.DeVries "Technical information series Cubic Boron Nitride; handbook of Properties" GE, June 1972). Therefore, generally speaking, the firing of the vitrified diamond grindstone is carried out at a high temperature of 650° C. or higher in a non-oxygen atmosphere, such as a nitrogen atmosphere. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D3/14B24D3/00B24D18/00
CPCB24D3/14B24D18/00B24D3/00
Inventor 山口昌三
Owner KURE GRINDING WHEEL