Overview of several common materials to drawing die

(1) alloy steel mould is die early manufacturing materials. Used in the manufacture of alloy steel materials are mainly carbon tool steel, alloy tool steel. But because the hardness and wear resistance of the alloy steel die poor, short life, can not meet the needs of modern production, so the alloy steel die soon be eliminated, in the production and processing the current has been almost invisible alloy steel die.
(2) carbide dies made of hard alloy. Hard alloy of tungsten cobalt alloy, it is the main component of tungsten carbide and cobalt. Tungsten carbide alloy "skeleton", mainly from the hard wear; cobalt is bonded to the metal, is the source of the toughness of the alloy. Therefore, compared with the hard alloy die and alloy steel mould has the following characteristics: high wear resistance, excellent polishing, adhesion of small, small friction coefficient, low energy consumption, high corrosion resistance, these characteristics make carbide drawing die has wide adaptability, wire drawing die has become the most common.
(3) the natural diamond are allotropes of carbon, which made by mould has the characteristics of high hardness, good wear resistance. But the natural diamond brittle, difficult processing, generally used in the manufacture of wire drawing die diameter below 1.2mm. In addition, natural diamond is expensive, supply of goods is in short supply, so the natural diamond die not eventually people seek economic and practical drawing tools.
(4) polycrystalline diamond is used after quality carefully selected excellent synthetic diamond single crystal with a small amount of silicon, titanium and other bond, under high temperature and pressure polymerization. Polycrystalline diamond hardness is very high, and a very good wear resistance, compared with other materials, it has its own unique advantages: due to the anisotropy of the natural diamond, during drawing, around when the holes are in working condition, natural diamond in a location hole wear characteristics will be preferred; the polycrystalline diamond belongs to multi crystal, with isotropic, thus avoiding the die wear is not uniform and the die hole Buyuan phenomenon. Compared with the hard alloy, the tensile strength of polycrystalline diamond is only common hard alloy 70%, but than carbide hard 250%, thus, the polycrystalline diamond die has more advantages than the hard alloy die. Drawing die made of wear resistance of polycrystalline diamond, bore wear uniform, strong impact resistance, high efficiency of drawing, and the price is much cheaper than the natural diamond. The polycrystalline diamond drawing die wire drawing is widely used in industry.
(5) CVD (chemical vapor deposition) it is the single crystal diamond finish, temperature resistance, but also has the advantages of polycrystalline diamond abrasion resistance and low price, good effect has been achieved in lieu of rare natural diamond drawing die tools preparation, its widespread use will bring a new vigor for wire drawing die industry.
(6) ceramic materials of high performance with high hardness, good abrasion resistance, high chemical stability, excellent high-temperature mechanical properties and bonding features not easily and metal, can be widely used in processing of difficult to machining materials. In the recent thirty years, due to manufacturing in ceramic materials in the process of realizing the effective control of raw material purity and grain size, adding technology development of a variety of carbide, nitride, boride, oxide, whiskers or a small amount of metal. The reinforcing and toughening mechanism, the strength, toughness, impact resistance performance of ceramic materials have improved.
(7) coated drawing die is a new technology developed recently, the main method is coating on the metal film on cemented carbide drawing die. The metal film is pure titanium coating, which has good smoothness, high temperature resistance, but also has the advantages of titanium abrasion resistance and low price, good effect has been achieved in lieu of cemented carbide drawing die tool.