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Cold drawing method and die for special-shaped pipes

A special-shaped tube and cold-drawing technology, applied in wire drawing dies, metal processing and other directions, can solve the problems of difficult cold-drawing processing of special-shaped tubes, small effective heat exchange area, immature production technology, etc. The effect of stable quality and stable size

Inactive Publication Date: 2011-09-21
ZHANGJIAGANG FREE TRADE ZONE HENGLONG STEEL TUBE
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AI Technical Summary

Problems solved by technology

The heat exchanger of the traditional waste heat boiler is formed by welding several round tubes and connecting plates arranged between the round tubes. In order to make the heat exchanger better resistant to impact, the connecting plate is set in the middle of the outer wall of the round tubes. The effective heat exchange area of ​​the device is small, and a large number of round tubes are required to make full use of waste heat, and welding is difficult and the welding cost is high
Now the heat exchanger of the new high-efficiency waste heat boiler is made of Ω-shaped cold-drawn special-shaped tubes closely packed and welded. This special-shaped tube has a large heating area and is easy to weld.
However, cold drawing processing of this special-shaped tube is difficult, the production technology is immature, and the finished product scrap rate is high, so it is difficult to quantify the production

Method used

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  • Cold drawing method and die for special-shaped pipes
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  • Cold drawing method and die for special-shaped pipes

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Embodiment Construction

[0029] The specific content of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as Figure 1-Figure 2 As shown, a cold drawing method for special-shaped tubes:

[0031] A. Pretreatment, including:

[0032] 1. Heading: cut off the head of one side and the sharp corners of the ends of the two wings of the tube blank that has initially formed an omega shape, so that the two wings of the tube blank transition smoothly to the tube end, and the burrs are ground off;

[0033] 2. Annealing: The annealing process added after the beginning process fully oxidizes the surface of the billet, so that the glass powder attached to the surface of the billet will naturally peel off along with the scale produced by annealing during the pickling process.

[0034] 3. Pickling: Cool the tube blank to room temperature after annealing, soak the lower acid tank with 15%~20% sulfuric acid, soak at a temperatu...

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Abstract

The invention discloses a cold drawing method and a die for special-shaped pipes. A heat exchanger for a waste heat boiler is formed by closely arranging and welding the omega-shaped special-shaped pipes produced by the method, the pipes are convenient to weld, welding cost is low, and the pipes can resist impact during use and have long service life. The effective heating area of the omega-shaped special-shaped pipe heat exchanger is about two times that of a round pipe heat exchanger, so that heat exchange efficiency is greatly improved, the volume of the waste heat boiler is greatly reduced, and manufacturing cost and occupied area are reduced.

Description

technical field [0001] The invention relates to a cold drawing method and a mold for a special-shaped pipe. Background technique [0002] The waste heat boiler is a device for heat recovery and utilization of waste gas from industrial production. The heat exchanger of the traditional waste heat boiler is formed by welding several round tubes and connecting plates arranged between the round tubes. In order to make the heat exchanger better resistant to impact, the connecting plate is set in the middle of the outer wall of the round tubes. The effective heat exchange area of ​​the device is small, and a large number of circular tubes are required to make full use of the waste heat, and welding is difficult and the welding cost is high. Now the heat exchanger of the new high-efficiency waste heat boiler is made of Ω-shaped cold-drawn special-shaped tubes closely packed and welded. This special-shaped tube has a large heating area and is easy to weld. However, cold drawing pro...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23P25/00B21C1/22B21C3/04
Inventor 程锡铭
Owner ZHANGJIAGANG FREE TRADE ZONE HENGLONG STEEL TUBE
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