All kinds of wire drawing die material with different characteristics. Among them, natural diamond drawing die the most expensive, processing is extremely difficult, also because of the anisotropy of natural diamond, in a radial range of hardness difference is large and easy to in a certain direction produced severe wear, so natural diamond die apply only to processing diameter small wires. Hard alloy die hardness is low, cemented carbide dies for drawing wire of high quality, low surface roughness, but poor wear resistance of hard alloy die, die life short. Polycrystalline diamond die hardness only to diamond, because of its characteristics of isotropic, won't produce single radial wear phenomenon aggravating, but its price is high, it is difficult to machine, the manufacturing cost is very high. CVD wire drawing dies because of its properties of diamond and has good abrasion resistance and wire drawing surface rough degree is low, but CVD wire drawing dies and the production process is complicated, difficult processing, high cost; ceramic mold with is higher than that of hard alloy mould hardness and wear resistance, making low cost, excellent material between between diamond and hard alloy production drawing die. But because of the toughness of ceramic materials, the thermal shock and difficult processing, compared with suitable for hot extrusion molding die has yet to achieve a wide range of applications.

The advantages and disadvantages of the several kinds of wire drawing die material

The "drawing die material - - - application advantages disadvantages

The alloy steel mould - making the simple and poor wear resistance and short service life - basically eliminated

The source of natural diamond, high hardness, good abrasion resistance and brittleness, difficult processing diameter 1.2mm below the line mode

Once the carbide polishing is good, low energy consumption and poor wear resistance, difficult processing: various wire diameter

The polycrystalline diamond - the high hardness and good wear resistance, difficult processing and high cost, small wire, wire

The CVD - the high smoothness, good temperature resistance, complex process, difficult processing, small wire, wire

Once the metal ceramic wear resistance, high temperature resistance, good corrosion resistance and thermal shock, poor toughness, difficult processing -- not a wide range of applications

Serine serine in small wire, wire drawing processing, natural diamond, polycrystalline diamond and CVD model is commonly used drawing die material. When drawing small diameter wire, CVD diamond model overcomes the anisotropy of natural diamond model, with excellent strength and hardness, the highest yield, and the surface quality is also required. Experiment proved that the CVD diamond wire drawing die life is equal to the die of natural diamond, high rate of qualified products, surface quality is better than that of domestic polycrystalline diamond. Therefore, CVD diamond wire drawing die is an ideal choice for small diameter wire drawing process.

* * although drawing die for processing all kinds of steel, copper, tungsten, molybdenum and other metal and alloy material, but different materials of drawing die for the the applicable scope of the processing, wire drawing die processing of different materials of the same the wear morphology and life there is a big difference, because of the reasonable selection of wire drawing die material is the key to ensure the successful application of the. Different materials of the drawing die has its relatively reasonable processing objects. The rationality of drawing process mainly refers to the mechanical, physical and chemical properties of wire drawing die and wire rod, so as to obtain the maximum service life of the mould. For example, in the drawing of the same diameter copper wire, polycrystalline diamond die service life is hard alloy die life of 300 ~ 500 times, drawing nickel wire is only 80 ~ 100 times, drawing molybdenum wire, the life only hard alloy die life 50 to 80 times, and carbon steel drawing, polycrystalline gold just stone mode of life only hard alloy die of 20 to 60 times. Because the system of matching theory of domestic wire drawing die and lack, resulting in blind choice, resulting in a waste of resources. Die wear is very complex, generally divided into two categories of damage and wear. Drawing die failure can be divided into cyclic tensile failure, failure, and the bearing surface damage, friction and wear can be divided into wear, friction and wear, corrosion wear, abrasion and wear particles generated. Working conditions (materials, wire drawing die material and lubricant) is different, the wear and damage of the drawing die has its unique process. The relationship between the wear failure dies, in essence, are interrelated. The situation inside the wire drawing die may be very subtle, some factors may also play a role, the role of their superposition is very complex, it is not easy to understand. May be a factor will cover other factors, these types of damage and friction and wear form often intertwined, increase the difficulty for the failure analysis of wear mechanism of drawing die. But in general, the wear resistance of the wire drawing die of various materials from high to low ranking is: diamond wire drawing die (without considering the anisotropy of natural diamond) ceramic wire drawing die - hard alloy die -- have eliminated the alloy steel mould.

Serine serine through research on drawing die material, wire drawing die is towards high strength, high hardness, high wear resistance development, in line with an endless stream of new materials, wire drawing dies and the wear resistance is greatly improved, wear, damage time was significantly delayed, increasing service life of drawing die, machining accuracy also has the 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.