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Cast profiles, "Past and Present"

Date:2014-9-24 9:46:23  From:HengGong

1, The overall profile:
Horizontal continuous casting iron bars of more than 30 years, iron bars in a foreign country called dense iron bar (Dense Bars), this material is dense, pressure air tightness, excellent mechanical properties, production rate, production low cost, materials, energy, sand casting is unmatched. Promote the use of cast iron profiles to improve the overall level of industrial machinery, especially to improve the quality of basic pieces, no doubt of great importance. Many foreign industrial countries has been widely applied in various fields iron bars. Mainly used in machine tools, hydraulic and pneumatic, textile and printing and other general machinery, molds, automotive and power, refrigeration and other industries, and these countries in the use of iron bars instead of sand-cast iron, steel, copper alloys and other materials in the process has been and achieved good results.
2, Horizontal continuous casting of cast iron production features profiles:
Horizontal continuous casting method for producing cast iron profiles (schematic diagram in Figure 1) are the raw materials through the cupola or induction furnace hot metal melting process will be strictly selected, the holding furnace pour molten iron flowing into the holding furnace installed in the bottom of the short crystallization after the reactor, and was solidified into a certain intensity chilled shell, with a tractor pulling into profiles. Molten hot metal holding furnace, in tractor pulling, they also continue to add to the mold is cooled and solidified, so continuous operation, producing cast iron profiles. Mold and the different production processes of different shapes can produce different sections, different materials iron bars.
Horizontal continuous casting iron bars
3, Horizontal continuous casting iron bars of the microstructure and mechanical performance characteristics:
(A) the microstructure of gray iron profiles for fine flake graphite (peripheral for small layer of D-type graphite interior for small A-type graphite) and ferrite and pearlite matrix. σb = 250 ~ 350Mpa, HB = 150 ~ 240, E = 1.1 ~ 1.7 × 105Mpa
(2) the organization graphite ductile iron tiny round ball, the ball is high, the ball a few more, no intergranular carbide mechanical properties of both high strength and high ductility. Profiles can also be obtained by heat treatment after ductile matrix microstructure and properties of a variety of needs, and sand casting ductile iron compared to the same strength, elongation increased by 50% to 100%.
(3) the use of horizontal continuous casting and closed mold process so that the surface profile of good quality and high dimensional accuracy, no sand, slag, porosity, shrinkage and other casting defects, processing yield is much higher than sand casting.
(4) high modulus of elasticity, modulus of elasticity of cast iron profiles various parts of the whole cross-section than the average high and uniform sand cast iron.
(5) the intensity of fatigue limit is higher, compared with the general fatigue than cast iron sand about 50% higher.
(6) good pressure resistance. When the pressure up to 40MPa, the wall thickness of 1mm no point sample infiltration and peripheral infiltration phenomenon.
(7) good machining performance, compared with the same sand casting material good cutting profiles, cast profiles cutting resistance is greater than and less than cast iron sand casting steel parts; surface finish, and sand cast iron castings, compared to steel, cast iron profiles in cutting at different speeds, surface finish is relatively small fluctuations, not only in low-speed (<50m / min) cutting, but also in the high-speed (> 200m / min) during cutting, can ensure that the surface roughness of not more than 20μm.
(8) cast iron surface profile surface treatment of glass, enamel-coated, copper, chromium, tungsten plating, carburizing, nitriding treatment, the performance is much better than sand-cast iron castings.
(9) cast profiles material, shape and size specifications, short production cycle, supply quickly.
(10) Cast profiles continuous production, high productivity, good working conditions, low emissions, product quality and stability.
4, Cast profiles in our application and prospects:
Currently, the domestic horizontal continuous casting iron bars in the country have begun to hydraulic, pneumatic, mechanical manufacturing, rail transport, refrigeration, automotive and power, shipping, textile and printing machinery, general machinery, oil drilling and other industries in the application. See the specific application areas and parts of applications.

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