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Cold forming process for non-ferrous metal seam elbow

A non-ferrous metal and cold forming technology, which is applied in the field of non-ferrous metal seamed elbow cold forming technology, can solve the problems of high performance requirements of forming equipment, high overall cost, and large application prospects, so as to avoid excessive wall thickness reduction and prevent The effect of excessive thinning and exceeding the standard and reducing costs

Active Publication Date: 2014-03-26
XIAN UNITED PRESSURE VESSEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Non-ferrous metal elbows are mainly used for thermoforming, and cold forming is mainly applied to stainless steel materials. For non-ferrous metals, there is basically no blank. Only a small number of small-sized seamless elbows (outer diameter Ф≤25mm) are formed by cold extrusion without a core mold. The application is very limited, but its efficiency is very high and the application prospect is great
Non-ferrous metals have excellent comprehensive properties, especially corrosion resistance, and most of them have strong erosion resistance. Its application is mainly limited by the high cost of materials, high performance requirements for supporting forming equipment, and high overall cost.

Method used

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  • Cold forming process for non-ferrous metal seam elbow
  • Cold forming process for non-ferrous metal seam elbow
  • Cold forming process for non-ferrous metal seam elbow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] C-276 nickel-based alloy elbow with a forming specification of 90E(L)Φ48.3mm×2.77mm:

[0037] Step 1. Using C-276 nickel-based alloy seamed tube blank as raw material, remove the weld reinforcement on the outer surface of the seamed tube blank, and remove the weld outer surface with reinforcement according to JB / T4730.5-2005 Carry out 100% PT non-destructive testing, grade I is qualified, then cut the seamed pipe blank into processed pipe fittings with oblique cuts at both ends, and make the weld on the inner surface of the processed pipe fittings be located on the long side of the processed pipe fittings; figure 1 As shown, the section of the processed pipe fitting along the central axis and the centerline of the weld is a pentagon, and the upper side L1 of the pentagon (that is, the short side described in step 2) is parallel to the lower side L2 (that is, the long side), The angle between the first hypotenuse L3 connecting the upper side L1 and the lower side L2 and ...

Embodiment 2

[0045] C-276 nickel-based alloy elbow with a forming specification of 90E(L)Φ114.3mm×3.05mm:

[0046] Step 1. Using C-276 nickel-based alloy seamed billets as raw materials, conduct RT non-destructive testing on the welds on the inner and outer surfaces of the seamed pipe billet, and the welds on the outer surface of the seamed pipe billet are removed. Reinforcement, according to JB / T4730.5-2005, carry out 100% PT non-destructive testing on the outer surface of the welded seam with reinforcement removed, and the I level is qualified. Make the weld on the inner surface of the processed pipe fittings be located on the long side of the processed pipe fittings; figure 1 As shown, the section of the processed pipe fitting along the central axis and the centerline of the weld is a pentagon, and the upper side L1 of the pentagon (that is, the short side described in step 2) is parallel to the lower side L2 (that is, the long side), The angle between the first hypotenuse L3 connectin...

Embodiment 3

[0054] TA2 pure titanium elbow with a molding specification of 90E(L)Φ219.1mm×3.76mm:

[0055] Step 1. Using TA2 pure titanium seamed billet as raw material, carry out UT non-destructive flaw detection on the welds on the inner and outer surfaces of the seamed pipe billet, and the I level is qualified, and remove the weld reinforcement on the outer surface of the seamed pipe billet. According to JB / T4730.5-2005, 100% PT non-destructive testing is carried out on the outer surface of the welded seam with reinforcement removed, and the grade I is qualified, and then the seamed pipe blank is cut into processed pipe fittings with oblique cuts at both ends, and the processed pipe fittings are processed. The weld on the inner surface is located on the long side of the processed pipe; for example figure 1 As shown, the section of the processed pipe fitting along the central axis and the centerline of the weld is a pentagon, and the upper side L1 of the pentagon (that is, the short sid...

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Abstract

The invention discloses a cold forming process for a non-ferrous metal seam elbow. The process comprises the following steps of: firstly, cutting into a processing pipe fitting; secondly, applying a lubricant on the processing pipe fitting and then placing the processing pipe fitting in a mold cavity of an elbow cold forming machine; thirdly, conducting non-ball stamping by using a non-ball stamping manner; fourthly, conducting ball passage stamping by a steel ball passage pushing manner for more than two times to obtain a formed elbow; fifthly, surface-treating the formed elbow, and then heat-treating; and sixthly, conventionally chamfering the port of the heat-treated elbow to obtain a finished elbow product. A seam pipe blank is used as a raw material, so that the cost can be obviously reduced, meanwhile, a welding seam is arranged at one side of an outer bending part of the mold cavity, and the stamping is conducted by the steel ball passage pushing manner, so that the central part of the elbow is prevented from being thinned too much to exceed standard; by gradually adjusting the size of the diameter of a steel ball, the maximum thinned position of the processing pipe fitting when being subjected to ball passage stamping is slowly moved, so that the outer arc central position of the elbow is prevented from being thinned too much to exceed standard.

Description

technical field [0001] The invention belongs to the technical field of forming nonferrous metal elbows, and in particular relates to a cold forming process of nonferrous metal jointed elbows. Background technique [0002] With the development of aerospace, shipbuilding and ocean engineering, electric power, petrochemical, gas and other industries, the amount of elbows used to transport liquids and gases in the piping systems of these industries is increasing, and the working conditions such as medium and temperature are Improving the quality level and production efficiency of elbow forming and use has become an important indicator to measure the processing capacity of pipe fittings manufacturing units. Especially in shipbuilding, hydrometallurgy, PTA projects, seawater desalination, alkali production, acetic acid (anhydride) and other industries, the application of non-ferrous metal elbows is increasing. [0003] At present, the main forming methods of non-ferrous metal elb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/28
Inventor 李宁叶建林董斌张成郗大来孙万仓
Owner XIAN UNITED PRESSURE VESSEL CO LTD
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