FAQ

Matters needing attention in the use of carbide cutting tools: 

•Cemented carbide cutting tool materials are hard and brittle, so be sure to use diamond grinding wheels for finishing. 

•Carbide cutting tool material is hard and brittle, so it will break when subjected to impact or excessive clamping force. 

•The thermal expansion coefficient of cemented carbide is small, so the products used as hot-sleeve or cold-sleeve will produce cracks if the service temperature is significantly different from the design value (higher or lower). 

•When storing cemented carbide cutting tools, keep them in a dry place, as cutting fluid or other liquids will corrode them and reduce the strength of the tools. 

•When brazing a hardness alloy blade, if the brazing temperature is too high or too wet, the blade will fall off or crack.

•After sharpening the carbide tool, it must be carefully checked for cracks. • After using electric machining of cemented carbide cutting tools, it is necessary to check whether there are residual cracks on the surface of the tool, otherwise it will affect the strength of the tool. If necessary, the surface cracks of the tool can be eliminated by fine grinding. 

 

Examples of failures that often occur in carbide cutting tool cutting are as follows:

1.Chipbreakers of turning tools used on profiling lathes (profiling of auto parts) 

2.Discussion on the relationship between clearance angle and tool life (end machining of electrical parts) 

3.Improvement of tool nose arc radius and machining surface accuracy (inner diameter finishing of mechanical parts) 

4.Defects of cutting edges and honing of cutting edges (peripheral cutting of automobile parts) 

5.Effect of cutting fluid (peripheral cutting of automobile parts) 

6.Countermeasures for deformation during thin plate cutting 

7.Selection of the number of milling cutter teeth when working hardened materials (die steel cutting) 

8.The effect of honing end mills (groove, step processing) 

Cemented carbide is a kind of alloy material made of hard compound of refractory metal and bonding metal through powder metallurgy process. It has the properties of high hardness, wear resistance, strength and toughness. Because of its unique properties, it is often used to make rock drilling tools, mining tools, drilling tools, measuring tools and so on. It is widely used in natural gas, chemical industry, construction machinery, fluid control and other fields. Cemented carbide is a material that is pressed by powder metallurgy. Today, Sidi Xiaobian will introduce to you several problems that we often encounter in the pressing process, and briefly analyze the reasons. . 

1. In the process of hard alloy pressing, the more common pressing waste is delamination Appearing along the edge of the pressure block, at a certain angle to the pressure surface, forming a neat interface is called delamination. Most delaminations start at the edges and extend into the compact. The reason for the delamination of the compact is the elastic internal stress or elastic tension in the compact. For example, the cobalt content of the mixture is low, the hardness of the carbide is high, the powder or grain is finer, the molding agent is too small or the distribution is not uniform, the mixture is too wet or too dry, the pressing pressure is too large, and the unit weight is too high. Large, complex shape of the compact, poor mold finish, uneven table, all may cause delamination. Therefore, improving the strength of the briquetting block and reducing the internal stress and elastic back whistle of the briquetting block is an effective method to solve the delamination.