What is the longest life of tungsten carbide cold heading dies?

In order to achieve the longest life of cemented carbide cold heading die, it is necessary to consider from many aspects such as mold design, material selection, manufacturing process, use and maintenance. The following are specific measures:

Mold design

Reasonable structure design: According to the shape, size and production process requirements of cold heading parts, design a reasonable mold structure. For example, the use of a suitable demoulding method to avoid excessive friction and impact force on the mold during the demoulding process of the parts can be used by ejecting mechanism or pushing plate demoulding to ensure that the parts are smoothly removed.

Optimize the mold size: accurately calculate the mold size parameters, including cavity size, wall thickness, transition fillet, etc. The reasonable size can make the stress distribution of the die under tungsten carbide cold heading die pressure uniform and reduce the phenomenon of stress concentration. If the appropriate transition corner is set at the corner of the mold, the stress concentration can be effectively reduced and the fatigue resistance of the mold can be improved.

Material selection

High quality cemented carbide: Choose tungsten carbide materials with good quality and stable performance. The hard alloy with high hardness and toughness can better resist the wear, impact and deformation during the cold heading process. According to the material and process requirements of cold heading parts, select the appropriate cemented carbide grade. For parts of ZHD82A carbide cold heading stainless steel, tungsten carbide grades with higher cobalt content and relatively balanced hardness and toughness can be selected.

Consider material matching: It is not only necessary to pay attention to the performance of the cemented carbide itself, but also to consider the matching between the cold heading equipment and carbide screw dies the material to be processed. For example, when the hardness of cold heading steel material is high, it is necessary to choose a cemented carbide mold with higher hardness and wear resistance to ensure that the interaction between the mold and the workpiece is in a reasonable state and reduce the wear and damage of the mold.

Manufacturing process

Precision machining: The use of advanced processing equipment and technology to ensure the machining accuracy of the mold. The high precision die can make the cold heading process more stable and reduce the uneven stress and wear caused by the mold size deviation. Such as the use of precision machining methods such as electric discharge machining, wire cutting machining, can ensure the dimensional accuracy and surface quality of the mold cavity.

Good surface treatment: Appropriate surface treatment of the mold, such as coating treatment. The coating can improve the hardness, wear resistance and lubricity of the mold surface, reduce the coefficient of friction, and reduce the adhesion and wear between the mold and the workpiece. Common coatings are titanium nitride (TiN), chromium nitride (CrN) and so on.

Use and maintenance

Correct installation and debugging: When installing the mold, it is necessary to ensure that the mold installation position is accurate and the accuracy of the carbide cold heading mold equipment meets the requirements. In the debugging process, the cold heading process parameters should be gradually adjusted, and the working state of the mold should be observed to ensure that the mold runs under normal working conditions.

Reasonable process parameters: According to the material, structure of the die and the characteristics of the parts to be machined, optimize the cold heading process parameters, including cold heading die force, stamping speed, feed rate, etc. Avoid too much cold heading force or too fast stamping speed, resulting in too high pressure and impact force on the mold.

Adequate lubrication cooling: Suitable lubricants and coolants are used during the cold heading process. Lubricant can reduce the friction between the mold and the workpiece, reduce wear; The coolant can reduce the temperature of the mold and prevent the mold from softening and deformation due to overheating.

Regular inspection and maintenance: Establish a regular mold inspection and maintenance system, timely find the mold wear, cracks and other problems, and repair or replace. Cleaning, lubrication and rust prevention of the mold can extend the service life of the mold.

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