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Shaped dual-layer graphite-cast iron mould material

A double-layer composite, graphite cast iron technology is applied in the cast iron material structure and production process for molds, and in the field of glass mold materials for determinant bottle making machines. The effect of good thermal fatigue resistance and reduction of white mouth tendency

Inactive Publication Date: 2005-05-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of low life and high cost of existing molds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A group of Fenjiu glass bottle molds produced by adopting the double-layer composite special-shaped graphite cast iron mold material of the present invention were installed on a QD6 type row machine in Qixian Glassware Factory. (machine speed 8 times / module)

[0015] The production process of mold casting blank is as follows:

[0016] The molten iron is smelted in a cupola furnace, and the batch ratio (Wt%) after the furnace is: scrap steel 12.5; P14 new iron 40; returned furnace iron 30; Finally, it is taken out of the furnace at 1400°C for vermicular treatment.

[0017] The specific process is: before tapping the iron, first place the composite modifier which accounts for 0.5% of the molten iron weight at the bottom of the treatment ladle, and press the Cu which accounts for 0.5% of the molten iron weight on the modifier on the top of it, and start to tap the iron to 1 / 2 of the molten iron ladle. 3 height, it will account for 1.3% of the molten iron, with a particle...

Embodiment 2

[0021] A group of Liuquxiang wine bottle glass molds were produced by the same process as Example 1, and were tested on a QD4 type row machine (machine speed: 8 times / mold.min) in Qixian Glassware Factory, with a service life of 728,000 times / mold.

[0022] The chemical composition of the test mold is as follows: C3.65, Si2.63, Mn0.70, Cr0.38, Cu0.42, Li0.00032, Ba0.00028, K0.0013, Na0.0038, B0.0009, Re 残 0.021, P0.082, S0.020 balance is Fe.

[0023] Test the mechanical properties of the mold material σ b =428N / mm 2 , HB=206.

Embodiment 3

[0025] According to Example 1, similar to the casting process, a group of 200mm cast tube inner molds were produced by using the shape of the two half-split metal molds to cast the inner mold. They were tested on the double-station continuous casting machine in Taiyuan Casting Pipe Factory, and the service life was 1868. times, which is 4.5 times that of the gray cast iron crystallizer (410 times).

[0026] The chemical composition (Wt%) of the test mold is C3.80, Si2.76, Mn0.65, Cu0.46, Cr0.40, Li0.0004, K0.0028, Na0.0020, B0.0008, Re 残 0.030, P0.10, S0.025 balance is Fe.

[0027] Test the mechanical properties of the mold material σ b =405N / mm 2 , HB=195.

[0028] The above actual examples fully prove that the material of the present invention has good thermal fatigue resistance and long service life, is an ideal high-quality mold material, and has good comprehensive economic benefits.

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PUM

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Abstract

A dual-layer shaped graphite-cast iron mould features the maximum use of waste iron filings. The molten low-alloy creep graphite cast iron containing Cu and Cr is specially modified by the salts of Li, Ba, K, Na and B-Fe to generate the spherical graphite on internal surface of mould. Its external surface is a composite cast iron generated by creep graphite. Its advantages include high pull strength (405-450 N / sq.mm) and hardness (HB=180-230), low cost and long service life.

Description

1. Technical field [0001] The material of the double-layer composite special-shaped graphite cast iron mold belongs to the category of casting, and relates to the glass mold material of a determinant bottle making machine and the cast iron material structure and production process for other molds. 2. Technical background [0002] The main reason for the failure of existing glassware, rubber and plastic molds is the oxidative fatigue and wear of the mold material. To improve the service life of this type of mold, the following requirements are put forward for the mold material. It should be easy to process, have a tendency to crack and deform Small, strong anti-oxidation and anti-growth ability; high thermal conductivity, low thermal expansion, good wear resistance and corrosion resistance, etc. [0003] At present, the mold material commonly used in China is low-alloy cast iron. Its main disadvantages are low strength, resistance to oxidation, pitting, easy wear and deformat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D15/00C03B9/30C22C37/00
Inventor 张金山许春香许并社
Owner TAIYUAN UNIV OF TECH
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