In recent years the rapid development of mold industry, graphite materials, new technology and the increasing of the impact of the mold factory mold market, becoming the first choice of graphite mold making materials with good physical and chemical properties.
Mold is the most widely used basic equipment in industrial production, the mold industry is the basic industry of the national economy. In modern industrial production, stamping, forging, die casting, extrusion, plastic injection or other processing methods widely used in product parts, and forming mold of supporting the blank forming product in accordance with the requirements of the parts. A variety of tools and products used in our daily life and production, to the machine base body shell, the first embryo to a small screws, buttons and various household appliances, all have a close relationship with the mold. The shape of the mold determines the shape of these products, the quality and precision of the mold will determine the quality of these products. In recent years the rapid development of mold industry, graphite materials, new technology and the increasing of the impact of the mold factory mold market, becoming the first choice of graphite mold making materials with good physical and chemical properties. [1]
Excellent performance
1 excellent thermal conductivity and conductive properties of the thermal stability of low coefficient of good expansion of 2 lines and 3 anti heat shock resistance to chemical corrosion and most metal is not easy to react at high temperatures (above 4 in most copper matrix sintering temperature of 800 DEG C) intensity increases with the temperature of 5 has good lubrication and abrasion resistance 6 easy processing, good machining performance, can mold into complex shape and high precision
application
Graphite mould for continuous casting and semi continuous casting of nonferrous metals
In recent years, at home and abroad are being promoted by the molten metal state directly continuous (or semi continuous) the production of rods or pipes and other advanced production methods. Domestic copper, copper alloy, aluminum, aluminum alloy and other aspects have begun to use this method. It is considered that the artificial graphite is the most suitable material for the continuous casting or semi continuous casting of nonferrous metals. The production practice shows that due to the adoption of the graphite mold, because of its good thermal properties (thermal conductivity determines the solidification rate of metal or alloy), good self-lubricating performance factors such as mold, not only make the casting speed increased, and the ingot of precise size, smooth surface, uniform crystal structure, can be processed directly under the procedures the. This not only greatly improve the yield, reduce the loss of waste products, but also a substantial increase in product quality. There are two kinds of continuous casting methods: vertical continuous casting and horizontal continuous casting.
Mould for pressure casting
Artificial graphite materials have been successfully used in the pressure casting of nonferrous metals. For example, zinc alloy and copper alloy castings produced by pressure casting die made of artificial graphite materials have been used in automotive parts and so on.
Graphite mould for centrifugal casting
Shi Momo has been successfully used in centrifugal casting. The United States has been using the thickness of 25 mm or more of the artificial graphite mold centrifugal casting bronze sleeve. In order to prevent the loss of artificial graphite mold, can take some measures to prevent oxidation. After casting a certain number of castings, the size of the inner hole of the mold can be enlarged so as to be used for casting large size casing pipe if the inner surface of the mould is burnt.
Hot pressing die
Artificial graphite hot pressing die for pressure sintering has the following characteristics: one is if the hard alloy pressing temperature up to 1350-1450 degrees, the required pressure units can be reduced to 67-100 kg / cm2 (i.e. cold pressure 1/10) can; two is pressurized and heated in the same process get, the sintering of the compact sintering can be a short period of time.
Glass forming mould
Because the graphite material has chemical stability, not easily affected by infiltration of molten glass, will not change the contents of the glass, graphite thermal shock performance is good, the characteristics of small size changes with temperature, so in recent years in glass manufacture has become an indispensable tool material, it can be used to manufacture glass tube, pipe, mold and other kinds of funnel special glass bottle.
Sintering mould and other diamond sintering mould
It is widely used in the manufacture of semiconductor industry, which has been widely used in the semiconductor industry because of its low thermal distortion. In addition, also in the use of mould graphite mold cast iron, non-ferrous metal with the durability of the mold, the mold for casting steel, heat-resistant metal (Ti, Zr, Mo) aluminium heat welding of cast and welded rail for the mold etc.. Hot pressing sintered diamond tools with graphite mold, shouldering the dual role of the heating element and the mold support in diamond tool manufacturing process, the quality of the graphite mould, diamond tools directly affect the dimensional accuracy, shape etc.. Hot pressing sintering process requirements: temperature (1000 +. 2) C, molding pressure of 16 ~ 50 MPa, holding time of heat preservation pressure of 15 ~ 30 min. In this condition, both the requirements of molding and the heating element has a conductive graphite mold, high resistivity, sufficient mechanical strength, but also need to have good oxidation resistance and long service life, to ensure that the diamond tool precision and excellent performance. At present, the western developed countries manufacturing diamond tools materials graphite mould, mainly for graphite ultrafine particle structure, high purity and high graphitization degree, the average diameter of less than 15 m, and 10 m, average pore size of less than 2 m. The graphite mould made of the carbon raw material
