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A kind of thixotropic forming method for pipe parts with shoulders

A technology of thixotropic forming and tubes, applied in the direction of forming tools, furnace types, furnaces, etc., can solve the problems of long production cycle, poor mechanical properties, low material utilization rate, etc., and achieve high production efficiency, good performance, and improved The effect of mechanical properties

Active Publication Date: 2020-05-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a thixotropic forming method for shouldered pipes, which uses Semi-solid forming technology, using two-step local thixoforming to prepare shouldered pipes with high material utilization rate, high production efficiency and excellent mechanical properties, including the following steps:

Method used

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  • A kind of thixotropic forming method for pipe parts with shoulders
  • A kind of thixotropic forming method for pipe parts with shoulders
  • A kind of thixotropic forming method for pipe parts with shoulders

Examples

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Embodiment 1

[0035] A kind of method for thixotropic forming of a copper alloy tube with shoulders described in this embodiment, the technological process is as follows figure 1 As shown, the mold structure is as Figure 2-3 As shown, the specific steps are as follows:

[0036] (1) The material of this example is ZCuSn10P1 copper alloy, and the measured solidus temperature of ZCuSn10P1 copper alloy is 876.1°C, and the liquidus temperature is 1024.2°C.

[0037] (2) Locally heat an extruded ZCuSn10P1 copper alloy tube with an inner diameter of 20mm, a wall thickness of 10mm, and a height of 50mm. The heating height is 10mm, and the heating temperature is 886°C and kept for 5 minutes; at the same time, the cavity of the concave mold is preheated to 420°C.

[0038] (3) Put the heated ZCuSn10P1 copper alloy tube into the pre-deformation cavity of the preheated die, and then drive the pre-deformation punch 1 to extrude the metal tube at a movement speed of 8mm / s, and hold the pressure for 3s af...

Embodiment 2

[0044] A kind of thixotropy forming method of 7075 aluminum alloy pipe with shoulders described in this embodiment, the preparation process is as follows figure 1 As shown, the specific steps are as follows:

[0045] (1) The material of this example is 7075 aluminum alloy, and the measured solid-liquidus temperature range of 7075 aluminum alloy is 540-638°C.

[0046] (2) Partially heat the 7075 aluminum alloy tube with an inner diameter of 20mm, a wall thickness of 10mm, and a height of 50mm prepared by spinning. The heating height is 10mm, and the heating temperature is 545°C and kept for 10 minutes; at the same time, the concave mold cavity is preheated to 360°C.

[0047] (3) Put the heated 7075 aluminum alloy tube into the pre-deformation cavity of the preheating die, and then drive the pre-deformation punch 1 to extrude the metal tube at a movement speed of 10mm / s, and hold the pressure for 6s after extrusion.

[0048] (4) Take out the pre-deformed 7075 aluminum alloy tub...

Embodiment 3

[0052] A kind of shoulder AZ91D magnesium alloy tube thixotropic forming method described in this embodiment, the preparation process is as follows figure 1 As shown, the specific steps are as follows:

[0053] (1) The material of this example is AZ91D magnesium alloy, and the measured solid-liquidus temperature range of AZ91D magnesium alloy is 470-595°C.

[0054] (2) Locally heat the drawn AZ91D magnesium alloy tube with an inner diameter of 20mm, a wall thickness of 10mm, and a height of 50mm. The heating height is 10mm, and the heating temperature is 478°C and kept for 8 minutes; at the same time, the concave mold cavity is preheated to 300°C.

[0055] (3) Put the heated AZ91D magnesium alloy tube into the pre-deformation cavity of the preheated die, and then drive the pre-deformation punch 1 to extrude the metal tube at a movement speed of 12mm / s, and hold the pressure for 10s after extrusion.

[0056] (4) Take out the pre-deformed AZ91D magnesium alloy tube and put it i...

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Abstract

The invention discloses a contact forming method of a pipe with a shoulder, and belongs to the field of semi-solid forming. The method comprises the following steps that firstly, a metal pipe is conducted local induction heating to a solidus temperature or above, and heat preservation is carried out; and then the metal pipe is put into a preheated progressive mold to carry out first pass extrusiondeformation and pressure maintaining is carried out; then the metal pipe is rapidly taken out, and put into the preheated progressive mold to carry out second pass extrusion deformation and pressuremaintaining is carried out so as to obtain a pipe part with the shoulder; then rapid water quenching is carried out on the pipe part with the shoulder, and finally T6 heat treatment is carried out. According to the method, progressive mold two-step local contact extrusion forming is adopted to prepare the pipe part with the shoulder, the mold is simple in structure, production efficiency is high,cost is low, product quality is high, a material utilization rate is high, and mechanization and automatic production are realized conveniently.

Description

technical field [0001] The invention relates to a thixotropic forming method for a pipe with a shoulder, which belongs to the field of semi-solid forming. Background technique [0002] The pipe fittings with shoulders have the functions of supporting the rotary shaft and positioning, and are often used in machinery, aerospace and other fields. One production method of pipe parts with shoulders is to first prepare tubular blanks by liquid forming methods such as centrifugal casting, and then obtain parts through machining; another production method is to use thick-walled plastically deformed metal pipes and directly machine them to obtain parts . In the first production method, on the one hand, due to the coarse dendritic structure of the liquid formed blank, the comprehensive mechanical properties of the bushing parts are not high, which affects the service life of the parts; on the other hand, the blank has undergone a large number of mechanical processing, resulting in lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/02B21D37/08B21D37/16B21D45/04C21D1/18C21D9/08
CPCB21D22/022B21D37/08B21D37/16B21D45/04C21D1/18C21D9/08
Inventor 肖寒赵帅熊迟周荣锋卢德宏蒋业华
Owner KUNMING UNIV OF SCI & TECH
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