Die and method for forming straight tube section-expansion section composite titanium alloy equal-wall-thickness curved generatrix thin wall rotation body component

A technology of forming molds and constant wall thickness, which is applied in the field of precision thermoforming of hard-to-deform materials, can solve the problems of severe wall thickness reduction, easy axial cracking, and drop, etc., to improve the overall performance and slow down the cracking defects of the mouth The effect of generating trends and increasing the expansion coefficient

Inactive Publication Date: 2014-04-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the existing problems of severe wall thickness reduction, prone to axial cracking, uneven deformation during the forming process, and degradation of the overall performance o

Method used

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  • Die and method for forming straight tube section-expansion section composite titanium alloy equal-wall-thickness curved generatrix thin wall rotation body component
  • Die and method for forming straight tube section-expansion section composite titanium alloy equal-wall-thickness curved generatrix thin wall rotation body component
  • Die and method for forming straight tube section-expansion section composite titanium alloy equal-wall-thickness curved generatrix thin wall rotation body component

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specific Embodiment approach 1

[0023] Specific embodiment 1: A mold for forming a straight cylinder-expanding section composite titanium alloy equal-wall thickness curved generatrix thin-walled rotary member consists of an upper template 1, an upper mold 2, a lower mold 3, an induction heating device 4, The heat insulating ring 5 and the lower template 6 are composed; the upper mold 2 is located at the lower part of the upper template 1, the upper mold 2 is divided into upper and lower parts, and the upper and lower parts are coaxially connected as a whole. The outer diameter of the small end of the front wall-thickness tube billet is small, and the lower part is cylindrical with a diameter smaller than the upper part. The three parts are connected in turn to form a coaxial integrated structure. The upper part of the lower mold 3 is cylindrical, and the diameter of the upper cylindrical shape of the lower mold 3 matches the inner diameter of the wall thickness tube billet before thermal processing after turn...

specific Embodiment approach 2

[0024] Embodiment 2: A method of forming a straight cylinder-expansion section composite titanium alloy equal-wall thickness curved generatrix thin-walled rotary member in this embodiment is carried out according to the following steps:

[0025] 1. Calculate the theoretical geometric shape and size of the variable wall thickness shell and determine the actual geometric shape and size of the variable wall thickness shell: based on the law of constant volume in the plastic processing process, calculate the theoretical volume of the target workpiece according to the geometric shape and size of the target workpiece, that is, the variable The theoretical volume of the wall-thickness shell, and then make a waste section reserved at both ends of the axial direction of the determined theoretical geometric shape of the variable-wall-thickness shell, and then use it as the actual geometric shape of the variable-wall-thickness shell; The ratio of the axial length of the constant wall thic...

specific Embodiment approach 3

[0036] Embodiment 3: This embodiment is different from Embodiment 2 in that: the axial ends of the billet described in step 1 respectively reserve a waste section with a length of 10 mm to 20 mm. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention relates to the technical field of precise hot forming of material difficult to deform in metal material plastic processing, in particular to a die and method for forming a straight tube section-expansion section composite titanium alloy equal-wall-thickness curved generatrix thin wall rotation body component. The problems that according to an existing method, the wall thickness is reduced sharply, axial cracking is prone to occurring, in the forming process, deformation is uneven, and overall performance of the component is reduced are solved. The forming method includes the steps that the shape and size of a variable-wall-thickness tube blank are calculated through theoretical calculation, an original thick wall tube blank is machined, a lubricant and a protective agent are used for performing coating before rotation, the tube blank with the variable wall thickness is formed in a rotary extrusion mode, the mouth part of the tube blank with the variable wall thickness is sheared at an electric spark end, before hot expanding, a lubricant and a protective agent are used for performing coating, and then induction heating is performed on an expanded mouth to obtain the straight tube section-expansion section composite equal-wall-thickness titanium alloy curved gemetratrix component. Evenness of the integral wall thickness of the obtained workpiece is high. The expanding coefficient and overall performance of the component are improved.

Description

technical field [0001] The invention relates to the technical field of precision thermoforming of difficult-to-deform materials in the plastic processing of metal materials, in particular to a mold and a method for forming a straight tube-expanding section composite titanium alloy equal-wall-thick curved generatrix thin-walled rotary member. Background technique [0002] Titanium alloy has the advantages of low density, high specific strength and specific stiffness, heat resistance and corrosion resistance, so it has been widely used in aviation, aerospace, weapons and petrochemical fields. With the needs of reducing weight, saving raw materials and reducing costs in the above fields, titanium alloy and other thin-walled rotary components are more and more widely used, especially the straight cylinder-expansion section composite equal-wall thickness titanium alloy medium and large thin-walled curved Busbar components serve important purposes. For this type of components, th...

Claims

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Application Information

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IPC IPC(8): B21D37/10B21D37/16B23P15/00B21D22/14
Inventor 徐文臣单德彬赵小凯陈宇马浩张治朋靳学泽
Owner HARBIN INST OF TECH
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