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Alloy gray iron material for vehicle covering mould and its preparation method

A technology for automobile panels and molds, which is applied in the field of alloy gray iron materials for automobile panel molds and its preparation, can solve the problems of size deviation and insufficient surface precision of panels, and achieve good machinability, strong processability and The effect of self-hardening ability

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 the 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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Adopt the chemical composition (weight %) of alloy gray iron as follows:

[0024] C 3.2, Si 2.2, Mn 0.8, Cr 0.5, Cu 1.0, Mo 0.5,

[0025] Ni 0.5, P<0.08, S<0.03, Fe balance

[0026] Put the batch material in the medium frequency induction furnace for melting, and the melting temperature is 1350°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 range of 850-950°C, the cooling method is air cooling, the operating frequency is 10-25KHz, and the output The power is 20-24KW.

[0027] After surface induction hardening, the test results show that the average surface hardness is 52HRC, and the depth of hardened layer is 2.75mm.

Embodiment 2

[0029] Adopt the chemical composition (weight %) of alloy gray iron as follows:

[0030] C 3.0, Si 2.0, Mn 0.7, Cr 0.3, Cu 0.6, Mo 0.3,

[0031] Ni 0.4, P<0.08, S<0.03, Fe balance

[0032] The preparation method in this example is exactly the same as that of Example 1 above.

[0033] After surface induction hardening, the test results show that the average surface hardness is 50HRC, and the depth of hardened layer is 2.69mm.

Embodiment 3

[0035] Adopt the chemical composition (weight %) of alloy gray iron as follows:

[0036] C 2.8, Si 1.8, Mn 0.6, Cr 0.1, Cu 0.2, Mo 0.1,

[0037] Ni 0.3, P<0.08, S<0.03, Fe balance

[0038] The preparation method in this example is exactly the same as that of Example 1 above.

[0039] After surface induction hardening, the test results show that the average surface hardness is 51HRC, and the depth of hardened layer is 2.83mm.

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Abstract

An alloyed gray pig iron used for the die of the covering part of car contains C (2.8-3.2 wt.%), Si (1.8-2.2), Mn (0.6-0.9), P (0-0.08), S (0-0.03), Cr (0.1-0.5), Cu (0.2-1.0), Mo (0.1-0.5), Ni (0.3-0.5) and Fe (rest). Its preparing process includes such steps as proportionally mixing raw materials, smelting, casting, audio induction quenching, 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 alloy gray iron material for automobile cover molds and a preparation 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, It is required that the cover mold should have high hardness and wear resistance. Due to 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 molds cast from this type of alloy cast iron, the phenomenon of insufficient surface precision or dimensional deviation of the punc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44
CPCY02P10/25
Inventor 吴晓春杨行玉闵永安
Owner SHANGHAI UNIV
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