April 27, 2017

Comparison of advantages and disadvantages for wire drawing dies materials

In the small wire rod, natural diamond drawing wire, polycrystalline diamond and CVD coating, wire drawing diesmaterials commonly used in drawing. The small diameter wire, CVD coated diamond model to overcome the anisotropy of natural diamond die, also has excellent strength and hardness, drawing the highest yield, surface quality to meet the requirements. The test proved that the CVD coating diamond wire drawing die life is equal to the natural diamond die, the qualified rate is high, the surface quality is better than domestic polycrystalline diamond. Therefore, for small diameter wire drawing processing, CVD coating diamond wire drawing die is the ideal choice.

 

Although the dies can be used for processing all kinds of steel, copper, tungsten, molybdenum and other metal and alloy material, but dies of different materials each have its applicable range of processing of different materials of the same wire drawing diesworking when the wear form and service life are very different, so the reasonable selection of die material is the key to ensure the successful application of drawing die. Different materials have a relatively reasonable processing object. Rationality of drawing processing mainly refers to both mechanical and wire drawing die, the physical and chemical properties, in order to obtain the long service life of the die. For example, in the drawing of the same diameter copper wire, polycrystalline diamond die life is the life of hard alloy die 300 ~ 500 times, drawing nickel wire is only 80 ~ 100 times, drawing molybdenum wire, the only life of hard alloy die life of 50 to 80 times, while drawing carbon steel, poly crystal diamond die The life span is only 20 to 60 times of the cemented carbide die.

 

Because the system of matching theory of domestic wire drawing die and lack, resulting in blind choice, resulting in a waste of resources.wire drawing die wear is very complicated, generally divided into two categories of damage and friction wear. Drawing die failure can be divided into ring failure, shear failure and tensile failure, supporting surface damage the friction and wear, can be divided into wear, friction and wear, corrosion wear, abrasion and fine particle wear resulting. Working conditions (wire materials, drawing materials, lubricants etc.) different, the drawing die wear and damage has its unique process. Relationship between the wear failure of drawing die in essence, are interrelated. The inside of wiredrawing diesis very subtle, some factors may also play a role, the role of their superposition is very complex, not easy to understand. It may be a factor of the role will hide The role of other factors, the above-mentioned damage and friction and wear form often intertwined,increase the difficulty for the failure analysis of wear mechanism of dies. But in general, the wear resistance of various materials dies from high to low ranking is: diamond wire drawing die of natural diamond (without considering the anisotropic problem) - alloy die - hard alloy ceramic wire drawing die die has been eliminated.

Through the study of drawing die material, wire drawing die is towards high strength, high hardness,high wear resistance of the development of new materials,all meet the requirements of emerge in an endless stream, the wear resistance was drawing increasing, wear, damage and delayed the time of increasing the service life of wire drawing die,the machining accuracy is improved to some extent. The scope of drawing is gradually expanding,from coarse to fine wires with various specifications can be processed, and the emergence of irregular shaped mould for processing wire.

 

Posted by: hannahgwendolyn at 09:38 AM | No Comments | Add Comment
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