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Production method for metal castings

A production method and technology for metal castings, applied in the field of production technology of metal castings, can solve the problems of difficult to meet product design requirements, short product service life, poor corrosion resistance, etc. Good lubricating performance

Inactive Publication Date: 2016-10-12
无锡市华东电力设备有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The existing diffuser material is ZG4Cr25Ni20Si2. Although this austenitic heat-resistant steel has excellent high-temperature performance, it has poor corrosion resistance, short service life, and poor casting performance. Castings are prone to various defects and are scrapped. Ultrasonic flaw detection is generally below level 3, which is difficult to meet product design requirements

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0007] 1. Mold preparation

[0008] It adopts the process method of plane splitting, upper and lower boxes, and flat pouring. In order to better retain slag, a closed gating system is designed. The closed gating system is composed of sprue, runner and ingate. The other end of the sprue is connected with the lower end of the sprue, and the upper end of the sprue is provided with a feeding port. Using the template method, design 2 insulation risers and place them on the top of the pipe. Put 2 sets of inner cooling irons and 2 pieces of outer cooling irons at the hot joint of the casting.

[0009] 2 pieces of wooden molding flat plates, positioning pin positioning, special sand box molding. Water glass sand is used for molding, mainly because the sand mold has good strength and is easy to operate. After CO2 hardening, the dry tensile strength is ≥2.5kg / mm2, and after drying with a hot air blower, the dry tensile strength is ≥4.5kg / mm2. Before pouring, brush the cavity surfac...

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PUM

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Abstract

A production method of metal castings. The invention relates to a production process of metal castings. Firstly, a clay core is set in a mold, and plane splitting is adopted, upper and lower boxes are used to make it, and a bottom injection leak bag is poured into the mold by an intermediate frequency alkaline induction furnace. The raw materials for smelting, after removing the sprue riser, take out the casting, and then heat treat the casting. The invention has good high-temperature strength, small deformation, small thermal cracking tendency, excellent corrosion resistance, and especially better casting performance than the original material.

Description

technical field [0001] The invention relates to a production process of metal castings. Background technique [0002] The diffuser is a key component of the bell furnace in the steel factory. The working temperature is 900°C±50°C, and there is a redox atmosphere in the furnace. The diffuser requires high temperature resistance, corrosion resistance, and good high temperature resistance strength. A set of 4 diffusers, each with a gross weight of 320kg. The existing diffuser material is ZG4Cr25Ni20Si2. Although this austenitic heat-resistant steel has excellent high-temperature performance, it has poor corrosion resistance, short service life, and poor casting performance. Castings are prone to various defects and are scrapped. Ultrasonic flaw detection is generally below level 3, which is difficult to meet product design requirements. Contents of the invention [0003] The object of the present invention is to provide a method for producing metal castings. [0004] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/08C22C38/08C22C38/18C22C38/04C22C38/02C22C33/06C21D1/28
CPCB22C9/02B22C9/082C21D1/28C21D2211/001C22C33/06C22C38/02C22C38/04C22C38/08C22C38/18
Inventor 丁建峰
Owner 无锡市华东电力设备有限公司
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