Steel for plastic injection moulding die with excellent mechanical workability

An injection molding and machining technology used in the field of steel for plastic injection molding molds

Inactive Publication Date: 2005-02-09
DOOSAN HEAVY IND & CONSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the existing S55C, SCM4 series, SNCM4 series, and their improved types cannot fully meet the stated requirements

Method used

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  • Steel for plastic injection moulding die with excellent mechanical workability

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Embodiment

[0029] In order to compare the characteristics of the SCM4 series and the improved SNCM4 series of mold steels that have been widely used as materials for plastic injection molding molds, and the mold steels of the present invention, these mold steels were produced by the production process described below.

[0030] First, a steel material having an alloy composition described in Table 1 was melted in an electric furnace, refined in a vacuum refining furnace, and a 25-ton ingot was cast. Then, the steel block was heated at 1170° C. and forged at a forging ratio of 4 or greater to produce an angle bar with a width of 1200 mm and a thickness of 430 mm. At this time, the temperature at the end of forging was 850° C., and normalization treatment was performed by heating at 880° C. after the end of forging.

[0031] In order to provide the same cooling conditions during quenching, the heat treatment of quenching and tempering is performed in the state where the forging scale is rem...

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Abstract

The invention provides a steel for plastic ejection mold excellent in machinability and weld repairing characteristics. The steel for plastic ejection mold having outstanding machinability has an alloy composition comprising 0.10 to 0.30 wt.% of C, 0.40 to 0.70 wt.% of Si, 0.90 to 1.50 wt.% of Mn, 0.005 to 0.020 wt.% of S, 1.0 to 2.5 wt.% of Cr, 0.10 to 0.50 wt.% of Ni, 0.20 to 0.5 wt.% of Mo, 0.001 to 0.20 wt.% of V, and the balance being Fe.

Description

technical field [0001] The present invention relates to a steel for a mold used as a mold material for plastic injection molding, and in particular to a steel for a mold for plastic injection molding that is excellent in machinability, can shorten mold manufacturing time, save mold manufacturing costs, and has excellent machinability. Background technique [0002] Conventionally, S55C, SCM4 series, SNCM4 series, and their improved types have been mainly used as steels for plastic injection molding dies. [0003] In particular, the recent development trend of steel for plastic injection molding molds emphasizes the shortening of the mold making time and the functionality of the materials prepared according to the application. Furthermore, there is an increasing demand for improved convenience for mold makers and mold users. Therefore, in order to meet the requirements, it is necessary to develop new types of steel for molds. [0004] Here, the so-called "convenience in use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18B29C33/38B29C45/26C22C38/46
CPCY02E30/39C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 金大中
Owner DOOSAN HEAVY IND & CONSTR CO LTD
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