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Abrasives basic knowledge
- Jan 04, 2019 -

Abrasives:

Grinding tools are referred to as abrasive tools. Grinding has three series of fixed abrasives, coated abrasives and superhard abrasives. Each has its own characteristics, exists independently, and has its own strengths. It is used in the national economy of all countries. In addition to the separate chapters of the coated abrasives, only a brief introduction of the bonded abrasives is given here.

Consolidated abrasive

The bonded abrasive is a tool with a certain shape and certain grinding ability made of abrasive (grinding material) and bonding agent.

Examples of markers for bonded abrasives:

Shape Size Abrasive Particle Size Bond Hardness Structure 35M/S GB/T2485

Shape code

300×50×75 Abrasive Type Abrasive Particle Size

Bonding agent

Organization number Maximum working speed Grinding tool technical conditions

Standard number

Except for the highest working speed and the standard number of the abrasive technical conditions, the other items are the characteristics of the fixed abrasive. The abrasive of the fixed abrasive has been detailed in (1). The abrasive particle size refers to the thickness of the abrasive. The abrasives of the fixed abrasives adopt the following series of standards. These seven characteristics are based on the provisions of the 1998 National Machinery Abrasives Standardization Technical Committee. The three characteristics of the hardness bond and the structure are described, and the rest will not be described again.

(1) Hardness:

The hardness here refers to the strength of the bonded abrasive under the external force, the bonding agent and the abrasive. According to the thickness of the particle size, the sandblasting hardness tester and the Rockwell hardness are respectively used. The hardness is super soft (super soft 1, super soft) 2), soft (soft 1, soft 2), medium soft (medium soft 1, medium soft 2), medium (medium 1, medium 2), medium hard (medium hard 1, medium hard 2, medium hard 3), hard (hard 1 , hard 2), super hard (super hard 1, super hard 2) and other 7 major levels a total of 15 small.

(2) Binding agent:

The bonding agent refers to a material in which various bonding agents in the bonded abrasive tool are bonded to the abrasive. The bonded abrasive tool generally adopts four major types of bonding agents: ceramic, resin, rubber, and diamond bituminous. These four types of binders have the largest proportion of ceramic bond abrasives. The main materials of ceramic bond are clay, feldspar, loess, quartz and other ceramic binders according to different abrasives, different uses and different methods (casting or pressing). The resin binder is mainly phenolic resin. Powdered resin and liquid resin are divided into various resin binders according to different methods and different uses. Rubber binders are currently used in three major categories: artificial styrene butadiene rubber, sodium butyrate rubber and liquid rubber. The difference in the method and the use of the method are divided into various rubber binders. The main material of rhombohedral binder is composed of magnesium oxide and magnesium chloride. It is mainly used for fine-grained abrasives for fine processing.

The codes for the various binders are as follows:

Binding agent name

Ceramic bond V

Resin bond B

Rubber bonding agent R

Rhombohedral binder Mg

(3) Organization:

The organization refers to the volume occupied by the abrasive in the fixed abrasive, expressed in weight% ratio. Usually the tissue is not displayed in the abrasive article mark, and when the formulation is made at the time of manufacture, the self-control is represented by Arabic numerals. The smaller the number, The looser the tissue, that is, the less the ratio of abrasive in the fixed abrasive. On the contrary, the larger the number, the tighter the tissue, and the more the abrasive grain ratio. Usually the organization number is from 0-12 to 13 organization numbers.

2, coated abrasives

2. A coated abrasive is an abrasive that adheres an abrasive to a flexible substrate, also known as a flexible abrasive.

Coated abrasives have nine characteristics:

Type of substrate - substrate processing - type of abrasive - grain size of the abrasive -

Sand density - binder type - bond strength - shape - size

Please refer to the third part of this article for abrasive belt coated abrasives.

3, super hard abrasive

Superhard abrasives are abrasives made of diamond or cubic boron nitride superabrasives, which are another series of abrasives.


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