Feb

Selection of grinding wheel for sharpening

One of the purposes of cutting tool sharpening is to obtain cost-effective cutting edge quality, and the key to quality is the choice of the size of the grinding wheels.

The finer the grinding wheel particle size, the smaller the cutting edge chipping, and the lower the grinding efficiency. For this reason, the PCD cutting tool sharpening process can be divided into three processing stages: rough, medium, and fine according to the accuracy of the cutting edge of the tool, its purpose (see Table 1) or its failure degree (see Table 2). Formulating a reasonable sharpening process according to specific conditions can greatly improve processing efficiency.

Grain size	Cutting edge accuracy	Grain size	Application
A (rough)	0.05mm	230/270#~320/400#	Rough grinding
B (medium)	0.02mm	M20~M40	Medium grinding
C (finish)	0.005mm	M5~M10	Finish grinding

6A2 diamond grinding wheel

Table1 Classified by cutting edge accuracy and usage

Serial number	Degree of failure	Grain size	Remarks
A (rough)	Broken cutting edge 0.5mm	230/270#~320/400#	Or electroprocessing
B (medium)	Cutting edge burst 0.3mm	M20~M40
C (finish)	Cutting edge wear 0.1mm	M5~M10

Table 2 Classification by the degree of cutting tools failure

Rough machining does not require high cutting edge, and electrical machining or grinding can be selected. The electrical processing efficiency is high, and it is suitable for processing complex tools, such as drill bits for printed circuit boards, forming milling cutters for cutting laminate flooring, etc. Coarse-grained grinding wheel can be selected for grinding, with large contact area and high grinding force (300～400N) during sharpening, which can quickly remove excess machining allowance.

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