What are the characteristics of diamond grinding?
In addition, there are new types of flexible (flexible) polishing abrasives and brazed single-layer abrasive abrasives, which are being developed in China, but few applications.
Diamond grinding tools are classified according to binders, mainly including the following categories:
| Type the current | Gb code | Original ministry code |
| Resin binder | B | S |
| Metal bond | M | (J) |
| Bronze bond | - | Q |
| Metal bond for electroplating | Me | D |
| Ceramic bond | V | A |
Resin bonded abrasive tools are the most widely used type of diamond abrasive tools, accounting for about 60% of the total amount of diamond abrasive tools in the world.This kind of abrasive tool is widely used in machining carbide workpiece and cutter.
The grinding characteristics of diamond resin grinding tools are mainly small grinding force and grinding heat, good self-sharpening, not easy to block, high processing efficiency, high surface smoothness, grinding tools easy dressing, but poor heat resistance, low strength, fast loss.Diamond concentration is usually about 75% (50% ~ 100%).
Bronze bond abrasive tools once dominated diamond abrasive tools.Later, it gradually gave way to diamond resin abrasive tools and took a second place.At present, it is mainly used for the processing of glass, ceramics, semiconductors and other non-metallic hard and brittle materials, as well as rough grinding, semi-fine grinding and forming grinding of hard alloys.
The grinding characteristics of diamond bronze grinding tools are mainly as follows: strong binding force, wear resistance, able to bear large load, good working surface geometric shape retention, long service life, but poor self-sharpening, low grinding efficiency, easy to block, often need dressing, and difficult dressing than resin grinding tools.When the bronze electrochemical grinding wheel grinds the large-area hard alloy, the efficiency and the smoothness all increase obviously, at this time is mainly by the electrolysis, takes the mechanical grinding as the auxiliary.
Electroplated metal bond diamond grinding tool, stronger binding force, high cutting edge of abrasive, sharp grinding, the highest concentration, up to 200%, high grinding efficiency, but thin working layer, short life.Electroplated abrasive tools are easy to be made into special thin, small and special shapes, which are suitable for grinding workpieces with complex shapes and special shapes.
Ceramic bond diamond abrasive tool, whose performance is between resin abrasive tool and bronze abrasive tool, is more durable than resin abrasive tool, sharper than bronze abrasive tool, and has unique advantages for rough grinding and semi-fine grinding.However, up to now, ceramic grinding tools are the least used in diamond grinding tools at home and abroad.The problem is that the sintering temperature of the ceramic binder is high and the diamond is difficult to bear.While researching and developing low temperature ceramic bond, people are also looking for alternative methods.First, is the resin abrasive modification, adding copper powder and other thermal conductivity and toughness filler, improve its heat resistance and durability;Second, the bronze grinding tool is modified by adding brittle filler to reduce its toughness and improve its self-sharpening.These two kinds of modified abrasive tools are used to occupy the proper position of ceramic abrasive tools.
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