The use of PCBN tools and common wear countermeasures

PCBN tool, with high hardness, good red hardness, oxidation resistance and fracture toughness, is an ideal tool for cutting ferrous metal materials.

At present, PCBN tool has been widely used in the processing of cast iron, hardened steel, high speed steel, high temperature alloy and other difficult materials and precision processing fields, and obtained significant technical and economic benefits.

1, PCBN tool for processing materials

PCBN tool is mainly suitable for processing all kinds of high hardness materials, wear-resistant materials and other difficult to process materials, including hardened steel, high-speed steel, bearing steel, high manganese steel, tungsten steel, gray cast iron, cold cast iron, ductile cast iron and so on. If the material is low in hardness and soft, it is not recommended to use PCBN tools.

2, PCBN tool geometric parameters and cutting amount

In order to give full play to the excellent performance of PCBN tools and achieve ideal machining results, reasonable selection of tool geometric parameters and cutting parameters can be used for different machining objects.

In terms of tool geometric parameters, the blade and tip strength should be considered. Generally, 0° front Angle or negative front Angle should be used, and negative chamfering should be grinded to increase the cutting edge strength. In order to increase the strength of the tool tip, the corresponding tool tip arc can be grinded.

Tool cutting quantity, should be based on the processing machine tool, blade number, workpiece and other processing conditions to carry out a reasonable choice.

3, PCBN tool common wear and countermeasures

In the use of PCBN tools, there will be normal wear and abnormal wear. Apart from normal wear, abnormal wear is mainly due to improper selection of cutting dosage and blade geometric parameters, insufficient rigidity of the system, etc.

(1) Back tool surface wear. Improvement suggestions: improve cutting line speed; Increase the workpiece feed; Increase cutting depth; Check whether the cutting point of the blade is located high in the center.

(2) Crescent depression wear. Improvement suggestions: reduce cutting speed; Reduce workpiece feed.

(3) the blade is broken. Suggestions for improvement: use chamfering blades or grinding blades; Reduce cutting speed or avoid discontinuous cutting whenever possible; Improve process system rigidity.

(4) The blade is severely damaged. Improvement suggestions: reduce cutting depth or machining allowance to reduce cutting load; Reduce cutting speed; Appropriately increase the fillet radius of the tool tip; Check whether the blade is properly installed.