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Red copper tube bending method

A copper tube and bending technology, applied in the field of copper tube bending, can solve the problems of unreachable users and uneven wall thickness of the tube, and achieve the effect of bending and smoothing.

Active Publication Date: 2008-08-20
中国船舶集团渤海造船有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the pyrotechnic bending process of copper tube filled with pebbles is that there are deep indentations on the inner wall of the tube after bending, resulting in uneven wall thickness. It has also been tried to bend copper tubes filled with steel shot and river sand, but the inner wall of the tube still has Intensive and superficial pits, which cannot meet the requirements of users

Method used

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  • Red copper tube bending method

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Embodiment

[0014] A copper tube bending method:

[0015] 1. Put the dry foundry scrubbing sand with a particle size of 40-80 mesh in an open iron box.

[0016] 2. Select poplar and fruit trees as the cork material. The angle of the car is 30° conical cork, and the length of the cork is 150mm.

[0017] 3. Insert the lower end of the copper tube 3 with a diameter of 260 mm, a length of 5200 mm, and a wall thickness of 5 mm into the cork 1, place it upright on a multi-layer sand filling platform with a height of 6 meters, and pour it into the upper mouth of the copper tube 3 for scrubbing Sand 2, while filling, beat the copper pipe wall evenly with a wooden stick, so that the scrubbing sand 2 can be filled. When the scrubbing sand 2 is flush with the mouth of the copper tube 3, drive the cork 1 from the upper tube mouth and at the same time beat the copper tube wall evenly with a wooden stick to make the scrubbing sand 2 evenly filled. The depth of the cork 1 is about 100mm.

[0018] 4. ...

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Abstract

The present invention relates to a red copper tube bending process. Said process includes the following steps: selecting dried casting sand whose grain size is 40-80 meshes; selecting wood material and making it into conical wood plug; inserting said wood plug into lower and of said red copper tube and placing said red copper tube vertically; filling said red copper tube with the dried casting sand and inserting another wood plug into upper end of said red copper tube; horizontally placing the red copper tube filled up with dried casting sand on a platform with mould, drawing bending position; placing the bending mould rod and fixing it on the platform; using gas flame to heat bending area, using small winch to draw tube end of red copper tube, using sample rod to check bent tube accuracy, correcting so as to obtain the invented product.

Description

(1) Technical field [0001] The invention relates to a method for bending metal pipes with certain plasticity, in particular to a method for bending copper pipes. (2) Background technology [0002] Since the 1970s, the copper pipeline with a bending radius R≤1.5DW (DW is the outer diameter of the tube) has been filled with pebbles in the tube and then bent into shape by flame heating. The disadvantage of the pyrotechnic bending process of copper tube filled with pebbles is that there are deep indentations on the inner wall of the tube after bending, resulting in uneven wall thickness. It has also been tried to bend copper tubes filled with steel shot and river sand, but the inner wall of the tube still has Dense and superficial hemp pits cannot meet the requirements of users. (3) Contents of the invention [0003] The technical problem to be solved by the present invention is to select a kind of filler for copper tube bending, keep the inner wall of the tube smooth, the be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D9/15B21D9/12B21D9/18
Inventor 李光民孟昭华刘春光韩英何吉刘德杰林则宪冯殿吉
Owner 中国船舶集团渤海造船有限公司
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