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A kind of processing method of tc4 titanium alloy seamless pipe material for aircraft landing gear

A technology of seamless pipes and processing methods, which is applied in the field of processing TC4 titanium alloy seamless pipes for aircraft landing gear, and can solve the difficulties of processing small outer diameter pipes and thick wall pipes, limited finished product specifications, and difficult promotion, etc. problems, to achieve the effect of saving raw material costs, good surface quality, and improving comprehensive mechanical properties

Active Publication Date: 2021-05-07
西安西部新锆科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of the finished pipe produced by this method are: the pipe with large outer diameter and thin wall can be obtained, the processing precision is high, the surface quality is good, the comprehensive mechanical properties are excellent, the length of the finished product can reach about 2000mm, and the pass rate is over 95%; the disadvantages are: : It is very difficult to realize the processing of small-diameter pipes and thick-walled pipes, resulting in limited product specifications. Due to the high technical difficulty, special equipment and tools must be provided. There are still many technical difficulties to be broken through, which makes it very difficult to promote.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]This embodiment includes the following steps:

[0037]Step 1. According to the target product Tc4 titanium alloy seamless pipe, the specifications of 24mm × 4mm × ~ 2100mm (diameter × wall thickness × length), determine the specifications of the TC4 titanium alloy extruded tube of 28 mm × 7.5 mm × ~ 2270mm ( The outer diameter × wall thickness × length), the extrusion ratio of the extrudation process using the present embodiment is determined that the specifications of the TC4 titanium alloy hollow bar blank is 80 mm × 18 mm × 230 mm (outer diameter × inner diameter × length), thereby determining TC4 The size size of the titanium alloy solid billet is 80 mm × 230 mm (diameter x length), and at the same time, according to the extrusion ratio, the extruded cylinder is 85 mm, and the extrusion needle is 15 mm;

[0038]Step 2, the specification size of the TC4 titanium alloy solid bar according to steps is selected to be 80 mm × 230 mm (diameter × length) of TC4 titanium alloy solid bil...

Embodiment 2

[0045]The present embodiment differs from the first embodiment in that the brass plate material and the dragonfly pad employed in step three are 2 mm, the heating temperature is 880 ° C, the transfer time is 5 s ~ 8S, the holding time is 50 min, The extrusion speed is 60 mm / s; the number of times in step four is 2 times, the temperature of the remaining temperature is from 480 ° C to 520 ° C, the cutting length of the head is 40mm to 55 mm, and the resection length of the tail is 100 mm. ~ 135mm.

Embodiment 3

[0047]The present embodiment differs from the first embodiment in that the brass plate and the yellow pad used in step three are 2 mm, the temperature of the heated is 900 ° C, the transfer time is 6s ~ 8S, the holding time is 40 min, The extrusion speed is 90mm / s; the number of times in the fourth temperature is 3 times, the temperature of the remaining temperature is 485 ° C to 520 ° C, the cutting length of the head is 45 mm to 60 mm, and the resection length of the tail is 100 mm. ~ 130mm.

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Abstract

The invention discloses a processing method for a TC4 titanium alloy seamless pipe used for an aircraft landing gear. The method comprises: determining and selecting a TC4 titanium alloy solid bar blank according to the specification and size of a target product for drilling to obtain a TC4 titanium alloy hollow bar blank , and then carry out sheath extrusion and heat straightening to obtain the intermediate product of TC4 titanium alloy seamless pipe. The intermediate product of TC4 titanium alloy seamless pipe is centered on the basis of the inner hole, and the outer circle is rough-turned, and then centered on the outer circle. Rough boring and fine boring are performed on the surface of the inner hole in turn, and the outer circle is fine-turned with the inner hole as the reference again, and the TC4 titanium alloy seamless pipe is obtained after cutting to length. The invention obtains the TC4 titanium alloy extruded tube billet with better comprehensive mechanical properties through extrusion molding, expands the size specification of the TC4 titanium alloy extruded tube billet, and then adopts a relatively high-precision positioning reference for machining, effectively avoiding the The deviation ensures the dimensional accuracy and quality of TC4 titanium alloy seamless pipes.

Description

Technical field[0001]The present invention belongs to the field of titanium alloy seamless pipe processing technology, and in particular to a method of processing a TC4 titanium alloy seamless pipe for aircraft landing gear.Background technique[0002]The landing gear is an accessory device that supports the aircraft under the lower part of the aircraft and supports the plane and is used for the ground moving attachment device. It has a large strength, and the force is more complicated, withstanding land impact, ground sliding, and various manipulation movements ( Such as brakes, turns, etc.) produced ground reaction, and land impact and ground slip impact loads have obvious dynamic characteristics, one of the important support and manipulation of the aircraft, is also the only support The components of the plane, the performance of its performance is directly related to the use and safety of the aircraft. As part of the aircraft body, the landing gear should ensure that the strength,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 刘金焕张建军李新意曹康琪雷江
Owner 西安西部新锆科技股份有限公司
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