Plastic mould steel and processing technology thereof
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A plastic mold and processing technology, applied in the field of alloy steel processing, can solve the problems of high steel prices and increased manufacturing costs of automobile products, and achieve cost reduction, high polishing performance and processing performance, and uniform internal hardness and surface hardness Effect
Inactive Publication Date: 2018-05-22
浙江天基重工机械有限公司
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But the price of H11 steel is higher, which will greatly i
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Embodiment 1
[0022] Embodiment 1, a kind of processing technique of plastic mold steel, this technique comprises the steps:
[0023] Step S1, smelting: batching, electric arc furnace smelting and refining according to the chemical composition and mass percentage of high-hardness and high-polish pre-hardened plastic mold steel;
[0024] Step S2, high-temperature diffusion heat treatment: the heating temperature is 1150-1250°C, and the holding time is 15-20h;
[0025] Step S3, forging thermal processing: cooling the steel ingot that has undergone high-temperature diffusion heat treatment to 950-1100°C, and performing multi-directional forging processing within this temperature range, adopting the two-upsetting and two-drawing forging method, the total forging compression ratio is ≥3, and the final forging temperature is ≥850℃;
[0026] Step S4, heat treatment after forging: air cooling after forging, and then normalizing treatment in a normalizing furnace, heating temperature 880-950°C, hea...
Embodiment 2
[0033] Embodiment 2, a processing technology of plastic mold steel, differs from Embodiment 1 in that the casting process is that the molten steel in the refining furnace is tapped out by crane ladle, and cast in a vacuum chamber for blowing. Argon, with a second vacuum treatment.
Embodiment 3
[0034] Embodiment 3, a processing technology of plastic mold steel, differs from Embodiment 1 in that in the step S7, after the hydrogen expansion annealing is completed, secondary normalizing is performed to further refine the grains.
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Abstract
The invention discloses plastic mould steel and a processing technology thereof. Main alloy elements in chemical components of the plastic mould steel comprise, by mass, 0.20-0.32% of C, 0.25-0.35% ofSi, 1.10-1.50% of Mn, 1.20-1.60% of Cr, 0.40-0.48% of Mo, 0.05-0.10% of V, 0.025% of P or the less, 0.005% of S or the less, 0.30-1.0% of Ni, 0.15% of Nb or the less and the balance Fe. The plastic mould steel has high polishing performance and processing performance, and in addition, the internal hardness and the surface hardness of the plastic mould steel are more uniform; heat treatment structural transformation in the processing technology is single, and the metallographic structure is more delicate and more uniform; materials are produced with the large forging ratio, and the cores of the materials are compact in structure; the deviation of the surface toughness and the core toughness of the materials is extremely small; and the processing period of a mould is shortened, and the costis reduced.
Description
technical field [0001] The invention relates to the technical field of alloy steel processing, in particular to a plastic mold steel and a processing technology thereof. Background technique [0002] With the rapid development of my country's manufacturing industry, more and more molds are used, and the performance requirements for mold materials are also getting higher and higher. [0003] In household appliances and office plastic product molds, such as TV casings, washing machine cylinders, copiers, etc., and in automotive interior and exterior plastic molds, such as bumpers, instrument panels, interior door panels, lights, etc. [0004] These molds require high polishing performance and processing performance, and most of them are made of H11 steel materials at present. But the high price of H11 steel will greatly increase the manufacturing cost of these automotive products. Contents of the invention [0005] Aiming at the deficiencies in the prior art, the first pur...
Claims
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