Forming method of precise high-temperature alloy pipe with small caliber and thick wall for aviation

A high-temperature alloy and forming method technology, which is applied in the field of forming small-diameter thick-walled high-temperature alloy tubes, can solve the problems of restricting the research and development and production of aero-engines, high manufacturing difficulty, and high price, so as to reduce the loss of main materials and save costs , Guarantee the effect of quality

Active Publication Date: 2014-07-23
宝武特冶航研科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] High-temperature alloy tubes for aviation are mainly used in the fuel supply system of aircraft engines. Due to their small specifications (outer diameter ≤ 8.5mm, wall thickness ≥ 2.3mm) and high precision (inner diameter tolerance is ±0.03mm, the detection method for inner diameter tolerance is A standard steel ball whose diameter is the lower tolerance of the inner diameter of the alloy tube is inserted into the alloy tube, and the steel ball can enter the lumen smoothly, while a standard steel ball whose diameter is the upper tolerance of the inner diameter of the alloy tube cannot enter the l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] To manufacture a finished tube with an outer diameter of 8.5mm, a wall thickness of 2.7mm, and a length of 4m, the steps are as follows:

[0032] First of all, cold rolling pipe mills such as LG-30, LD-30, LD-15 are used to perform multi-pass cold rolling on qualified seamless tube blanks to obtain over-specification tube blanks with an outer diameter of 9.9 mm, the wall thickness is 2.6mm, the length is 3300mm, and the size deviation between the outer diameter and the wall thickness is controlled within ±0.03mm.

[0033] Then, perform degreasing, heat treatment, pickling, straightening and UT flaw detection on the tube blank of the transition specification according to the above method, select the qualified tube blank obtained through UT flaw detection, and make the tip, and then the tip is formed by air drawing. Finished tube.

Example Embodiment

[0034] Example 2

[0035] To manufacture a finished pipe with an outer diameter of 8.3mm, a wall thickness of 2.5mm, and a length of 3.5m, the steps are as follows:

[0036] Firstly, cold rolling pipe mills such as LG-30, LD-30, LD-15 are used to perform multi-pass cold rolling on qualified seamless tube blanks to obtain over-sized tube blanks with an outer diameter of 9.5 mm, the wall thickness is 2.45mm, the length is 2950mm, and the dimensional deviation between the outer diameter and the wall thickness is controlled within ±0.03mm.

[0037] Then, perform degreasing, heat treatment, pickling, straightening and UT flaw detection on the tube blank of the transition specification according to the above method, select the qualified tube blank obtained through UT flaw detection, and make the tip, and then the tip is formed by air drawing. Finished tube.

Example Embodiment

[0038] Example 3

[0039] To manufacture a finished pipe with a diameter of 8mm, a wall thickness of 2.3mm, and a length of 3m, the steps are as follows:

[0040] First, cold rolling pipe mills such as LG-30, LD-30, LD-15 are used to perform multi-pass cold rolling on qualified seamless tube blanks to obtain over-specification tube blanks with an outer diameter of 9.15 mm, the wall thickness is 2.25mm, the length is 2550mm, and the size deviation between the outer diameter and the wall thickness is controlled within ±0.03mm.

[0041] Then, perform degreasing, heat treatment, pickling, straightening and UT flaw detection on the tube blank of the transition specification according to the above method, select the qualified tube blank obtained through UT flaw detection, and make the tip, and then the tip is formed by air drawing. Finished tube.

[0042] After inspection, the quality and accuracy of the finished pipes produced by the above three implementations meet the requirements, wh...

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Abstract

The invention discloses a forming method of a precise high-temperature alloy pipe with small caliber and thick wall for aviation. The forming method comprises the following steps: S1: cold rolling: carrying out multi-pass cold rolling on a qualified seamless tube to obtain a tube blank in transitional specification, wherein the outer diameter of the tube blank in the transitional specification is 1.14-1.17 times of that of a finished tube, the wall thickness of the tube blank is 0.97-0.985 times of that of the finished tube, and the dimensional deviation is controlled within a range of plus or minus 0.03mm; S2: manufacturing a pointed end: carrying out degreasing, heat treatment, acid cleaning, straightening and UT (ultrasonic) flaw detection on the tube blank with transitional specification sequentially, selecting the qualified tube blank obtained after UT flaw detection, and welding a pointed end with conicity at the end part of the qualified tube blank; S3: empty sinking: drawing the tube blank by the pointed end and deforming the tube blank under the extrusion of an outer mold to obtain a finished tube. The forming method makes up the technical gap of domestically producing the precise high-temperature alloy pipe with small caliber and thick wall, and has important economic benefit on the research and the production of a domestic aero-engine.

Description

technical field [0001] The invention relates to a forming method of a small-diameter thick-walled high-temperature alloy pipe, in particular to a forming method of a precision small-diameter thick-walled high-temperature alloy pipe used in an aircraft engine oil supply system. [0002] Background technique [0003] High-temperature alloy tubes for aviation are mainly used in the fuel supply system of aircraft engines. Due to their small specifications (outer diameter ≤ 8.5mm, wall thickness ≥ 2.3mm) and high precision (inner diameter tolerance is ±0.03mm, the detection method for inner diameter tolerance is A standard steel ball whose diameter is the lower tolerance of the inner diameter of the alloy tube is inserted into the alloy tube, and the steel ball can enter the lumen smoothly, while a standard steel ball whose diameter is the upper tolerance of the inner diameter of the alloy tube cannot enter the lumen; the outer diameter tolerance is ±0.04 ), large length (single...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21C1/22
Inventor 杨军和黄文展曾勇
Owner 宝武特冶航研科技有限公司
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