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Production method for mass production of stable pearlite nodular cast iron QT500-7

A pearlite sphere, mass production technology, applied in the direction of reducing gas emission and improving process efficiency, can solve the problems of unfavorable batch production of castings, complex transfer process, low efficiency, etc., achieve stable content, improve process characteristics, process simple effect

Active Publication Date: 2020-04-17
湖北省丹江口丹传汽车传动轴有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing production technologies are realized by adjusting the cooling time or heat treatment process, and the cost is relatively high
[0003] In addition, during the casting process of the membrane shell of ductile iron QT500-7 in the preparation process, the shell is released from the roasting furnace. It is necessary to ensure that the red shell is poured. The shell temperature is 600-850 ° C. Due to the high temperature, a specific The tool is transferred from the roasting furnace. The transfer process is complicated and inefficient, which is not conducive to the mass production of castings
At present, there is no batch and rapid production process of investment casting to produce nodular cast iron QT500-7 with stable pearlite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of production method of stable pearlitic nodular cast iron QT500-7 of this embodiment in batches, comprises the following steps:

[0030] (1) Investment casting shell making and roasting: shell making and roasting are unique processes of investment casting technology. The shell is made of water glass binder, quartz sand powder and quartz sand fine sand are respectively used as the shell surface Layer coating and sanding material, using high alumina powder, water glass and ordinary quartz sand as the sanding material of the back coating; using aluminum chloride and adding an appropriate amount of hydrochloric acid as the hardener, the coating passed by the module, sanding, hardening, and air-drying , is a one-layer shell-making process, and the shell-making process is cycled 4 times to strengthen the thickness of the mold shell, and at the same time, the surface of the mold shell is wrapped with fine wire to increase the strength; then it is left for 24 hours and t...

Embodiment 2

[0041] (1) Investment casting shell making and roasting: shell making and roasting are unique processes of investment casting technology. The shell is made of water glass binder, quartz sand powder and quartz sand fine sand are respectively used as the shell surface Layer coating and sanding material, using high alumina powder, water glass and ordinary quartz sand as the sanding material of the back coating; using aluminum chloride and adding an appropriate amount of hydrochloric acid as the hardener, the coating passed by the module, sanding, hardening, and air-drying , is a one-layer shell-making process, and the shell-making process is cycled 4 times to strengthen the thickness of the mold shell, and at the same time, the surface of the mold shell is wrapped with fine wire to increase the strength; then it is left for 24 hours and then dewaxed; the mold shell is placed after dewaxing Roast for 12 hours. The mold shell after dewaxing is roasted in a natural gas circulation ro...

Embodiment 3

[0052] (1) Investment casting shell making and roasting: shell making and roasting are unique processes of investment casting technology. The shell is made of water glass binder, quartz sand powder and quartz sand fine sand are respectively used as the shell surface Layer coating and sanding material, using high alumina powder, water glass and ordinary quartz sand as the sanding material of the back coating; using aluminum chloride and adding an appropriate amount of hydrochloric acid as the hardener, the coating passed by the module, sanding, hardening, and air-drying , is a one-layer shell-making process. The shell-making process is cycled 5 times to strengthen the thickness of the mold shell, and at the same time, the surface of the mold shell is wrapped with fine wire to increase the strength; then it is left for 24 hours and then dewaxed; the mold shell is placed after dewaxing Roast for 12 hours. The mold shell after dewaxing is roasted in a natural gas circulation roasti...

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Abstract

The invention discloses a production method for mass production of stable pearlite nodular cast iron QT500-7. A production process comprises the steps of shell making and roasting of an investment casting shell->base iron smelting->molten iron nodulizing ->three times inoculation treatment->die shell casting->die-set cooling. Each production process is improved, so that the die shell temperature in a die shell pouring process is lowered to 70-120 DEG C and then the die shell can be taken out of a roaster, the use of special tools is not needed, the process is simplified, batch production is realized, and the production benefits of casting enterprises is improved. The produced stable pearlite nodular cast iron QT500-7 as-cast matrix structure pearlite is between 35-55%, the nodulizing levelis 1-3 grade, the graphite is 6-7 grade, the tensile strength Rm is more than or equal to 578 MPa, the centage elongation after fracture A is more than or equal to 8%, and the hardness HB is 170-230.

Description

technical field [0001] The invention belongs to the technical field of casting high-performance metal materials, and in particular relates to a production method for batch production of stable pearlitic nodular cast iron QT500-7. Background technique [0002] Ductile iron QT500-7 is a material with better comprehensive properties, and has been widely used in engineering construction because of its better strength and elongation. When this material is used for some wear-resistant parts, the surface of the parts must be quenched because the parts have high requirements for wear resistance, and the content of pearlite in the matrix structure of QT500-7 has a great influence on the quenching stability. Most of the existing production technologies are realized by adjusting the cooling time or the heat treatment process, and the cost is relatively high. [0003] In addition, in the casting process of the membrane shell of ductile iron QT500-7 in the preparation process, the shell...

Claims

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Application Information

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IPC IPC(8): C22C33/08C22C37/04C22C37/10C21C1/10B22D1/00
CPCB22D1/00C21C1/10C22C33/08C22C37/04C22C37/10Y02P10/143Y02P10/20
Inventor 肖江曾勇严学涛
Owner 湖北省丹江口丹传汽车传动轴有限公司
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