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Production method of stainless steel/copper composite material heat exchange pipe fitting

A composite material and stainless steel technology, applied in the field of heat exchange pipe fittings manufacturing, can solve the problems of reducing heat exchange efficiency, weld cracking, weld failure, etc., and achieve the effects of good surface quality, improved casting quality, and strong filling ability

Inactive Publication Date: 2010-09-15
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently known brazing seams, explosive welding seams, and friction welding seams, due to differences in thermal expansion and thermal conductivity of dissimilar metals, during the welding process, after welding cooling and subsequent cold and hot cycle work, stainless steel / There must be high thermal stress and residual stress in the weld area of ​​copper pipes, which will lead to weld failure and weld cracking
In addition, although the use of copper-containing stainless steel heat exchange tubes can meet the reliability of welding with stainless steel partitions, the thermal conductivity is low, which will greatly reduce the heat exchange efficiency

Method used

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  • Production method of stainless steel/copper composite material heat exchange pipe fitting
  • Production method of stainless steel/copper composite material heat exchange pipe fitting
  • Production method of stainless steel/copper composite material heat exchange pipe fitting

Examples

Experimental program
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Effect test

Embodiment 1

[0010] The manufacturing method of the stainless steel / copper composite material heat exchange pipe of the present invention comprises basic techniques such as figure 1 : Install the riser, load pure copper raw materials, preheat the suction casting mold, riser and pure copper raw materials and heat the components in the composite transition zone, vacuumize, fill with protective gas, smelt alloys, maintain a certain superheat, raise Crucible, rapid vacuuming of the upper furnace chamber, vacuum suction casting, pressure maintenance, lowering of the crucible, pouring the remaining material, cooling the upper furnace chamber, taking out the casting, rotary forging hardening, machining, and finally obtaining a bright and seamless stainless steel / copper composite pipe . Below in conjunction with embodiment the present invention is described in further detail: Embodiment 1: present embodiment is carried out according to the following concrete steps: 1) the stainless steel / copper gr...

Embodiment 2

[0011] Embodiment 2 The present embodiment is carried out according to the following specific steps: 1) the prepared stainless steel / copper gradient composite transition zone parts are placed on the vacuum suction casting pipe mold (vacuum suction casting pipe mold such as figure 2 and image 3 As shown, the two ends of the suction casting mold for short), the copper-rich end of the transition piece is close to the center of the pipe fitting mold, the vacuum suction casting pipe mold is fixed in the upper furnace cavity of the multi-functional anti-gravity casting equipment, and the multi-functional anti-gravity casting The riser pipe of the equipment communicates with the upper and lower furnace chambers of the equipment, and the upper end of the riser pipe is connected to the vacuum suction casting pipe mold in the upper furnace chamber, and the lower end of the riser pipe is placed on the Put pure copper into the cold crucible directly above the cold crucible in the lower ...

Embodiment 3

[0012] Embodiment 3 The present embodiment is carried out according to the following specific steps: 1) the prepared stainless steel / copper gradient composite transition zone parts are placed on the vacuum suction casting pipe mold (vacuum suction casting pipe mold such as figure 2 and image 3 As shown, the two ends of the suction casting mold for short), the copper-rich end of the transition piece is close to the center of the pipe fitting mold, the vacuum suction casting pipe mold is fixed in the upper furnace cavity of the multi-functional anti-gravity casting equipment, and the multi-functional anti-gravity casting The riser pipe of the equipment communicates with the upper and lower furnace chambers of the equipment, and the upper end of the riser pipe is connected to the vacuum suction casting pipe mold in the upper furnace chamber, and the lower end of the riser pipe is placed on the Put pure copper into the cold crucible directly above the cold crucible in the lower ...

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PUM

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Abstract

The invention discloses a production method of a stainless steel / copper composite material heat exchange pipe fitting. The basis process of the production method comprises the following steps of: mounting a riser tube; feeding a pure copper raw material; preheating a suction casing die, the riser tube and the pure copper raw material; heating a compound transition area component; evacuating; introducing protective gas; melting an alloy; keeping a certain superheat degree; ascending a crucible; quickly evacuating an upper furnace chamber; carrying out vacuum suction casting and pressuring maintenance; descending the crucible and pouring surplus materials; reducing the temperature of the upper furnace chamber; taking out a casting; and rotatably swagging and hardening and mechanically machining the casting to obtain a bright, seamless and complete stainless steel / copper composite pipe. By adopting a vacuum suction casting technology, the melted pure copper liquid state metal has strong mold-filling capacity and can be consecutively solidified; particularly, thin parts can realize complete mould filling and the casting has favorable surface quality and high precision, thereby improving the casting quality; in addition, the invention ensures that a heat exchange tube has high heat conductivity of copper and also excellent welding performance of stainless steel.

Description

technical field [0001] The invention belongs to the field of manufacturing heat exchange pipe fittings, and relates to a manufacturing method for a composite material that can ensure high thermal conductivity and excellent welding performance under low-temperature cooling and heating cycle conditions, especially a stainless steel / copper composite material heat exchange pipe fitting. Manufacturing method. Background technique [0002] The heat exchange tubes of cryogenic heat exchangers work in low temperature liquids and are subject to intense and repeated cooling and heating cycles. There is a large difference in thermal expansion coefficient between the material of the upper and lower stainless steel partitions and the material of pure copper heat exchange tubes, resulting in stainless steel / copper Pipe joints are subject to high and frequent tension and compression stresses. [0003] Currently known brazing seams, explosive welding seams, and friction welding seams, due ...

Claims

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Application Information

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IPC IPC(8): B22D18/06
Inventor 马坤胡锐郑筠刘涛
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD