Method for forming long tube part with partial convexity

A technology of local protrusions and parts, applied in the direction of forming tools, manufacturing tools, engine components, etc., can solve the problems of poor strength and rigidity of parts, unreachable overall performance, complicated production process, etc., to reduce deformation resistance and save equipment The effect of investment and saving mold cost

CN101219451BInactive Publication Date: 2010-06-02HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2010-06-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a formation method of a long pipe-shaped part with partial embossment and solves the problems of poor strength and stiffness, complex processes and high cost due to the adoption of a present production method that a pipe with partial embossment is first formed and then assembled and welded into a long pipe-shaped part with partial embossment. The method of the invention isthat: firstly, both ends of a pipe (1) are sealed by a sealing device (2); secondly, a small-sized mold is designed according to the shape of the partial embossment; thirdly, a heating device (6) isused for heating the mold; fourthly, the pipe (1) is injected with high-pressure liquid or high-pressure gas through a channel (7) on the sealing device (2); fifthly, when the pipe inside a mold cavity of the mold is completely deformed and matched with the mold cavity, the long pipe-shaped part with partial embossment is then obtained. The invention is characterized by small size of the mold, equipment table and tonnage. Compared with the traditional formation method, the part produced by the method has the advantages of low cost, good overall performance and surface quality.
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Description

technical field

[0001] The invention relates to a method for forming a partially convex long tube part. Background technique

[0002] At present, in order to save energy consumption and reduce pollution emissions, it is required to realize lightweight manufacturing in high-energy-consuming fields such as automobiles and aircraft. The main way to reduce weight is to use lightweight materials and lightweight structures. Lightweight materials include aluminum alloys, magnesium alloys, titanium alloys and composite materials. Lightweight structures mainly include thin shell parts, hollow variable cross-section parts and integral components. For hollow variable cross-section parts, the traditional manufacturing process is generally to stamp two halves and then weld them into a whole. The process is complicated and the quality is difficult to guarantee. If the internal high pressure forming method is used, such parts can be formed at one time. The so-called internal high-press...

Examples

specific Embodiment approach 1

[0020] Specific implementation mode one: combine figure 1 The present embodiment will be described. The steps of the forming method of the long tube parts with local protrusions in this embodiment are as follows:

[0021] Step 1. First, seal the two ends of the pipe 1 with the sealing device 2. The sealing device 2 is composed of a constraining ring 8, an elastic ring 9, a nut 10 and a tie rod 11 with a tapered surface. The constraining ring 8 is set on the end of the pipe 1. On the tie rod 11 with a tapered surface, the restraining ring sleeve 8 is connected with the pipe 1 through the thread 3, the elastic ring 9 is arranged on the inner wall of the end of the pipe 1 and the outer circumference of the tie rod 11 with a tapered surface, and the nut 10 is arranged on the restraining ring sleeve 8 On the tapered tie rod 11 at the outer end, the axis of the tapered tie rod 11 is provided with a pressure medium channel 7, and the tapered end of the tapered tie rod 11 is arranged...

specific Embodiment approach 2

[0026] Specific implementation mode two: combination figure 1 The present embodiment will be described. The heating device 6 of this embodiment adopts the heating method of electric heating rod or hot oil circulation.

specific Embodiment approach 3

[0027] Specific implementation mode three: combination figure 1 The present embodiment will be described. The elastic ring 9 of this embodiment is made of polyurethane material.