A small-diameter seamless magnesium alloy tube cross-rolling process

A technology of seamless magnesium alloy and magnesium alloy, which is applied in metal rolling and other directions, can solve the problems of poor plastic deformation ability of magnesium alloy, easy cracking of seamless magnesium alloy tubes, and shortened processing cycle, so as to achieve excellent comprehensive performance and improve material quality. Utilization, avoiding the effect of anisotropy

Active Publication Date: 2020-08-04
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: Aiming at the technical problem of poor plastic deformation ability of magnesium alloy and easy cracking in the process of seamless magnesium alloy tube processing, the present invention proposes a small-diameter seamless magnesium alloy tube cross-rolling process, using cross-rolling The piercing process replaces the traditional extrusion and drawing process to produce seamless magnesium alloy tubes, which fundamentally solves the problem of high energy consumption and low efficiency in the processing of seamless magnesium alloy tubes, effectively shortens the processing cycle, and provides a basis for the production of high-quality seamless magnesium alloy tubes provide assurance

Method used

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  • A small-diameter seamless magnesium alloy tube cross-rolling process
  • A small-diameter seamless magnesium alloy tube cross-rolling process
  • A small-diameter seamless magnesium alloy tube cross-rolling process

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Experimental program
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Effect test

Embodiment 1

[0046] Such as Figure 1~7 As shown, a small-diameter seamless magnesium alloy tube cross-rolling process is carried out in sequence by the following steps:

[0047] (1) Establish constitutive equation

[0048] The extruded magnesium alloy was subjected to 0.005s by the Gleeble thermal simulation experiment machine -1 , 0.05 s -1 , 0.5 s -1 、3s -1 Deformation rate, isothermal compression experiment at 200°C, 250°C, 300°C, 350°C, 400°C, 450°C heating temperature conditions, to obtain the true stress-strain curve of the magnesium alloy, and construct the constitutive equation as follows:

[0049] In the formula: R—gas constant, R=8.314 J / (mol K);

[0050] T—absolute temperature, in K;

[0051] — strain rate, in s -1 ;

[0052] —Flow stress, in MPa.

[0053] (2) Establish rolling model

[0054] Use Deform finite element software to simulate the perforation process of seamless magnesium alloy pipes with different temperatures, extensions, and pore throat diameters, i...

Embodiment 2

[0066] A small-diameter seamless magnesium alloy tube cross-rolling process adopts the following steps to carry out in sequence:

[0067] The same as the above-mentioned first embodiment, the constitutive equation and the rolling model are established sequentially, and finally the rolling process parameters in the second embodiment are determined as follows: the rolling temperature is 400°C, the extension of the plug is 20 mm, and the feeding angle is selected to be 7 °, the diameter of the plug is Φ30mm, the diameter of the hole throat is Φ35mm, and the rotational speed of the roll is 170rpm.

[0068] (3) cross rolling piercing

[0069] Ⅰ. The stage to be perforated

[0070] (1) First, punch the centering hole Φ15mm×15mm in the front end of the magnesium alloy bar, and then put the magnesium alloy bar into the heating furnace for preheating. The temperature is the same as that of the core, which is reserved for the cross-rolling and piercing stage;

[0071] (2) Start the s...

Embodiment 3

[0079] A small-diameter seamless magnesium alloy tube cross-rolling process adopts the following steps to carry out in sequence:

[0080] The same as in the first embodiment above, the constitutive equation and the rolling model are established in sequence, and finally the rolling process parameters of the third embodiment are determined as follows: the rolling temperature is 500°C, the extension of the plug is 25mm, and the feeding angle is selected to be 10° , The diameter of the plug is Φ30mm, the diameter of the hole throat is Φ35 mm, and the rotation speed of the roll is 200rpm.

[0081] (3) cross rolling piercing

[0082] Ⅰ. The stage to be perforated

[0083] (1) Firstly, punch a centering hole Φ15mm×15mm in the front end of the magnesium alloy bar, then put the magnesium alloy bar into the heating furnace for preheating, the preheating temperature is 450°C, and the holding time is 2 hours, so that the bar skin The temperature is the same as that of the core, which is...

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Abstract

The invention provides a small-diameter seamless magnesium alloy pipe oblique rolling technique and belongs to the field of light alloy material production. The technical problems that the plastic deformation capacity of magnesium alloy is poor, and a seamless magnesium alloy pipe is prone to cracking in the machining process are solved. According to the solution, the oblique rolling technique comprises the following sequential steps that firstly, a constitutive equation is established; secondly, a rolling model is established, specifically, practical rolling technological parameters are determined by means of Deform finite element software through simulation; and (3) oblique rolling and perforating are conducted, specifically, a bar stock sequentially passes a to-be-perforated stage and an oblique rolling and perforating stage, the head portion and the tail portion of an obtained seamless magnesium alloy pipe billet are cut off, and a finished seamless magnesium alloy pipe is obtained through subsequent production. According to the technique, a traditional extruding and drawing technique is replaced with the oblique rolling and perforating technique to produce the seamless magnesium alloy pipe, the seamless magnesium alloy pipe machining problems of high energy consumption and low efficiency are solved fundamentally, the machining period is effectively shortened, and guarantees are provided for production of the high-quality seamless magnesium alloy pipe.

Description

technical field [0001] The invention belongs to the field of light alloy material production, and in particular relates to the production of a small-diameter seamless magnesium alloy tube, in particular to the production of the seamless magnesium alloy tube by a three-roll cross-rolling process. [0002] technical background [0003] At present, there are a number of enterprises with advantages in magnesium alloy processing in China, but due to technical defects in magnesium alloy rolling theory, technology and equipment, their production is relatively backward, resulting in serious pollution, high energy consumption and comprehensive utilization of resources in the magnesium alloy processing industry. The degree is poor, the product quality is unstable, the product yield is low, there are more primary raw materials and primary magnesium products, and there are fewer magnesium alloy deep-processing enterprises and products. [0004] In view of the poor plastic deformation abi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B19/04
CPCB21B19/04
Inventor 丁小凤双远华周研林伟路胡建华王清华代佳毛飞龙苟毓俊王军
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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