The wear and service life of the alloy round saw blade cannot be ignored

1. Alloy circular saw blade wear can be categorized into normal wear and abnormal wear. The tool undergoes intense friction with the cutting material under high temperature and pressure, gradually causing the cutting edge to become dull. The following are the problems caused by wear:

A. Back-tooth wear occurs on the front face adjacent to the cutting edge, forming a facet inclined towards zero degrees when worn.

B. After the front face wear, a crescent-shaped concave area is formed when the front face leaves the main cutting edge. This type of wear usually occurs in thick plastic materials.

C. Simultaneous wear of the front and back edges, which is caused by the formation of a crescent-shaped concave area on the front face and worn facets on the back face.

2. Abnormal wear:

A. It is caused by tool angle design or manufacturing process.

B. It is influenced by factors such as material elasticity, plasticity, stress, dynamic balance, etc.

C. It is influenced by alloy wear resistance, including cutting edge roll and matrix rigidity.

3. Reasons for tool wear:

A. Rough grinding of the blade with grooves, where the hardness and wear resistance of the alloy are smaller than that of the cutting material.

B. Adhesive wear occurs when the tool angle rubs against the cutting plate, generating high temperature and bonding.

C. Diffusion wear occurs when the alloy elements and wood chemical substances mutually diffuse and form chemical purification during high-temperature cutting.

D. Phase transformation wear occurs when the alloy and matrix undergo temperature changes or dynamic compression, leading to material phase transformation and unstable dynamic cutting.

E. Oxidation wear occurs when oxygen in the air oxidizes cobalt, tungsten, and titanium carbide in the alloy.

F. Other wear caused by insufficient rigidity during the cutting process, resulting in elastic or plastic displacement due to impact load, excessive internal stress during welding, and mechanical factors.

4. Wear process of alloy circular saw blade. Excessive surface roughness, large radial runout, uneven working of each alloy blade strip, excessive load on some parts, and too light load on others. Too small front angle affects the heat dissipation of each cutting part, and the grinding of each alloy front and back angle is inconsistent, causing changes in the microstructure of some alloy phases in the blade strip during cutting.

5. Factors affecting the service life of alloy circular saw blades. The smaller the thermal conductivity, the worse the heat dissipation effect of the tool, which poses a difficult problem for dry cutting with alloy circular saw blades. Therefore, the selection of reasonable tool geometric parameters is the key to ensuring their service life. Increasing the front angle reduces cutting force and temperature, but if the front angle is too large, the strength decreases. Decreasing the back angle and back edge angle leads to slow cutting speed. There are still contradictions between them, and of course, there are many other factors that affect the tool, which are not listed one by one.

6. Principles to enhance the service life of alloy circular saw blades. The matrix material should preferably be alloy tool steel to prevent deformation when the matrix temperature reaches 300° with good stress relief, and the design of the tooth seat heat dissipation groove should be scientifically reasonable. Blade thickness-coefficient 0.8~1=matrix thickness. The alloy configuration should not be too small, thin, or short. Welding should consider welding strength, temperature, stress, and process. Grinding process, grinding fluid, diamond grinding wheel material and granularity, equipment rigidity and precision, grinding feed speed and feed rate. The tool life can only be reduced and the service life improved if there is a reasonable value for one of them. If an economical approach is taken in production, the service life will inevitably decrease, and efficiency will naturally increase.

QH200 face and top grinding machine