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Hard hollow alloy ball iron mould material for vehicle mould and its making method

A technology for automobile molds and mold materials, which is applied in the field of alloy cast iron material manufacturing technology, can solve the problems of poor mold hardness, insufficient surface accuracy of covering parts, etc., and achieves the effect of strong processing technology.

Inactive Publication Date: 2005-11-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after surface treatment, such as flame quenching, of the cover mold cast from this type of alloy cast iron, the phenomenon of insufficient surface precision or dimensional deviation of the stamped cover often occurs during production and use.
The main reason for these situations is that the composition of the mold material and improper control of the structure cause poor final quenching of the mold and insufficient hardness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In the present embodiment, adopt the chemical composition (weight %) of alloy ductile iron material as follows:

[0025] C 3.7, Si 2.4, Mn 0.6, Cr 0.2, Cu 0.9,

[0026] Mo 0.5, Ni 0.3, P<0.02, S<0.02, Fe balance

[0027] Put the batch material in a medium frequency induction furnace for melting, and the melting temperature is 1400°C. The obtained casting, whose size is φ60×150mm, is used as a sample; then the audio induction heating equipment is used for surface quenching treatment, the temperature is controlled in the temperature range of 850-950°C, the cooling method is air cooling, and the operating frequency is 10-25KHz. The output power is 20-24KW.

[0028] After surface induction hardening, the test results show that the average surface hardness is 60HRC, and the depth of hardened layer is 2.75mm.

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PUM

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Abstract

An air-hardened alloyed nodular cast iron for the die of car contains C (3.5-3.8 wt.%), Si (2.1-2.5), Mn (0.5-0.8), Cr (0.1-0.3), Cu (0.8-1.0), Mo (0.4-0.6), Ni (0.2-0.4), P (0-0.02), S (0-0.02) and Fe (rest). Its preparing process includes such steps as proportionally mixing raw materials, smelting, casting, quenching in audio induction mode, heating to 850-950 deg.C, and quenching in air. Its advantages are high hardness and high mechanical performance.

Description

technical field [0001] The invention relates to an air-hard alloy ductile iron mold material for automobile molds and a manufacturing method thereof, belonging to the technical field of alloy cast iron material manufacturing technology. Background technique [0002] The molds such as dies, punches and blank holders of automobile panels are deep drawing dies. During the working process, they must bear strong friction, radial stress and compressive stress, and are often scrapped due to dimensional wear and grooves on the surface. Therefore, Cover molds should have high hardness and wear resistance. Because of its large size and complex shape, it is usually cast from alloy cast iron, among which Cr-Mo cast iron is widely used because of its good comprehensive properties. However, after surface treatment, such as flame quenching, of the cover mold cast from this type of alloy cast iron, the phenomenon of insufficient surface precision or dimensional deviation of the stamped cov...

Claims

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Application Information

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IPC IPC(8): C22C38/44
CPCY02P10/25
Inventor 吴晓春汪宏斌杨行玉
Owner SHANGHAI UNIV
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