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The basic rule of resin abrasive formula (the relationship between abrasive type, particle size, bonding dose and strength)
Jun 16 , 2020

The basic rule of resin abrasive formula (the relationship between abrasive type, particle size, bonding dose and strength)


The basic elements of resin abrasives are abrasive type, abrasive particle size, abrasive hardness, combined dosage, abrasive organization, molding density or strength, etc., and their correlations are shown in Table 1.


 Relationship table of basic elements of resin abrasive tools
表1  树脂磨具基本要素关系表
Basic elements of formula
配方基本要素
变化关系
changes in the relationship between
Abrasives types
磨料种类
change
变化
invariability
不变
invariability
不变
invariability
不变
abrasive grain
磨料粒度
invariability
不变
diminution
变细
invariability
不变
invariability
不变
Bond
结合剂量
change
变化
increase
增加
increase
增加
invariability
不变
Forming density
成型密度
invariability
不变
invariability
不变
invariability
不变
enlargement
增大
Abrasive hardness
磨具硬度
invariability
不变
invariability
不变
enhance
提高
enhance
提高
                                                                               Table 1


1. The relationship between the type of abrasive and the combined dose

 

Under the conditions of the same particle size and molding density, it is necessary to make abrasive tools of the same strength level. The amount of silicon carbide abrasive used is more than the corundum abrasive. This is because:

(1) The density of corundum abrasive (3.95~3.97g/cm3) is larger than that of silicon carbide (3.12~3.20g/com3). When the mass and particle size numbers are the same, the number of particles of silicon carbide abrasive is more than corundum abrasive, so the total surface area is large.

(2) The shape of silicon carbide abrasive is sheet and needle and corundum abrasive is mostly rhombohedral. This further increases the total surface area of the silicon carbide abrasive.

Therefore, when the other conditions are the same, the surface area of silicon carbide abrasive is large, so more bonding agent is needed to bond.

 

2. Relationship between abrasive grain size and combined dose

 

(1) When the abrasive strength (or hardness), abrasive type and molding density (or pressure) are the same, the combined dosage increases with the increase of the particle size number. That is, the finer the abrasive, the more binding dose is required. This is because the same quality abrasives, the finer the particle size, the greater the number of particles, the greater the total surface area. Therefore, the more binder needed to surround the surface layer.

(2) Under the same conditions, the combined dosage of mixed particle size is less than that of single particle size. This is because the fine-grained abrasive is filled between the gaps of the coarse-grained abrasive particles, replacing (or occupying) a portion of the binder volume, so the amount of binder is reduced. Resin flake grinding wheels or cymbal shaped grinding wheels often use mixed grain abrasives to improve the strength of the grinding wheels, and this principle is used. Therefore, although the abrasives with mixed grain abrasives are used in the same amount as the single-grit grinding wheels, the strength is significantly improved.

 

3. The relationship between combined dose and hardness (or strength)

 

The changes in hardness and strength of abrasive tools are generally consistent. The combined dose is one of the main factors affecting the hardness or strength of the abrasive. In the case of the same type of abrasive, particle size and molding density (or pressure). Increasing the combined dosage of the formula can improve the hardness and strength of the abrasive. Conversely, if the combined dosage in the formula is reduced, the hardness and strength of the abrasive tool will decrease. This is because when the bonding dose is increased, the bond bridge between the abrasives becomes thicker, making the abrasive particles bond more firmly and more resistant to external forces.

 

4. The relationship between molding density (or pressure) and abrasive hardness.

 

In the case of the same kind of abrasive, particle size and bonding dose, as the forming density (or pressure) increases, the hardness and strength of the abrasive tool also increase. This is because the molding density (or pressure) increases, the density of the abrasive tool also increases, the distance between the abrasive particles decreases, the bond bridge is thicker, and the abrasive particles are more firmly bonded, so the hardness and strength of the abrasive tool raised. therefore. Adjusting the forming density (or pressure) of the abrasive is the main method to adjust the hardness and strength of the abrasive. Especially for high-hardness abrasives, the effect of increasing the forming density is more significant than increasing the amount of bonding.

For the manufacturing of abrasive tools with the same hardness, as the forming density (or pressure) increases, the amount of bonding agent can be reduced accordingly. Therefore, the forming density (or pressure) and the amount of bonding are the main reasons for controlling the hardness and strength of the abrasive tool.

 

5. Recipe adjustment

 

The same level of hardness (or strength) can be achieved in three ways:

(1) More combined dose and lower molding density;

(2) Less combined dose and larger molding density;

(3) General combined dose and general molding density.

In general, when designating a plan, you should follow the rule that as the hardness or strength increases, the combined dose and forming density also increase at a time.


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