A pneumatic-compression composite forming method for rectangular cross-section hollow parts of hard-to-deform materials with rounded corners r≤2t

A technology of rectangular cross-section and composite forming, which is applied in the field of forming of rectangular cross-section hollow components of difficult-to-deform materials, can solve the problems of poor inner profile precision, low profile precision, uneven wall thickness, etc., so as to improve precision and reliability. , the effect of reducing the length of the weld

Active Publication Date: 2019-11-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high pressure, poor inner surface precision, uneven wall thickness, poor reliability and low surface precision of the existing hard-to-deform material rectangular cross-section hollow components. to solve the problem, and provide a pneumatic-compression composite forming method for rectangular cross-section hollow parts with edge fillets R≤2t

Method used

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  • A pneumatic-compression composite forming method for rectangular cross-section hollow parts of hard-to-deform materials with rounded corners r≤2t
  • A pneumatic-compression composite forming method for rectangular cross-section hollow parts of hard-to-deform materials with rounded corners r≤2t
  • A pneumatic-compression composite forming method for rectangular cross-section hollow parts of hard-to-deform materials with rounded corners r≤2t

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Effect test

specific Embodiment approach 1

[0022] Specific implementation mode 1: This implementation mode is an air pressure-molding composite forming method for a hollow part with a rectangular cross-section made of a hard-to-deform material with rounded corners R≤2t, which is specifically completed according to the following steps:

[0023] 1. Preforming: Preheat the mold to temperature T 1 ,T 1 is the forming temperature of the hard-to-deform material tube blank, then put the hard-to-deform material tube blank into the mold, and heat the hard-to-deform material tube blank to T 1 , at temperature T 1 Then use the mold to mold the hard-to-deform material tube blank into the preform shape to obtain the preform; the wall thickness of the difficult-to-deform material tube blank is t, the outer diameter of the hard-to-deform material tube blank is D, and the height of the preform is for h 1 , and 0.1D≤h 1 ≤0.9D;

[0024] 2. Air pressure forming: seal both ends of the preform with a sealing structure, and then pass g...

specific Embodiment approach 2

[0027] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the hard-to-deform material tube blank described in step 1 is a titanium alloy round-section tube blank or an intermetallic compound round-section tube blank. Others are the same as the first embodiment.

specific Embodiment approach 3

[0028] Specific implementation mode three: combination image 3 , Image 6 with 7 As shown, the difference between this embodiment and one of the specific embodiments 1 or 2 is: the mold described in step 1 is composed of an upper mold 2 and a lower mold 3, and the upper mold 2 and the lower mold 3 are preheated to a temperature T 1 , and then put the difficult-to-deform material tube blank 1 into the mold cavity formed by the upper mold 2 and the lower mold 3, and heat the difficult-to-deform material tube blank 1 to the temperature T through the heat conduction of the mold 1 , at temperature T 1 Next, the upper mold 2 is used to move downward to mold the difficult-to-deform material tube blank 1 into a preform shape to obtain a preform. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides an air pressure-die pressing complex formation method of a hard-deforming material and rectangular section type hollow part with a side edge fillet R not greater than 2t, belongs to the technical field of mechanism manufacturing, and specifically relates to a formation method of a hard-deforming material and rectangular section type hollow part. The method aims at solving the problems of high pressure, low inner molded surface accuracy and non-uniform wall thickness in air pressure deformation of a small edge side billet, and low reliability and low molded surface accuracy in welding formation of an existing hard-deforming material and rectangular section type hollow part. The method comprises the following steps: 1, pre-forming a prefabricated blank; 2, sealing a pipe end; and forming under air pressure to obtain a pure expansion pipe; and 3, forming in an air pressure-die pressing complex manner to obtain the rectangular section type hollow part. The method hasthe advantages that the deformation in multi-piece welding process is avoided; the air pressure for fillet formation is reduced; local thinning of the fillet is avoided; the inner molded surface accuracy is improved; and stress concentration danger points are avoided. The method is mainly performed to prepare the hard-deforming material and rectangular section type hollow part with the side edgefillet R not greater than 2t.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a forming method of a hollow member with a rectangular cross-section made of a difficult-to-deform material. Background technique [0002] In hot-end components such as aircraft and rocket engines, titanium alloys or intermetallic compounds are often used to make hollow variable-section components. A typical type of component is as figure 1 As shown, it is a rectangular cross-section member with height variation along the axis ( figure 1 ), which is characterized by small edge fillets and high precision requirements on the inner surface. For example, the outer fillet radius of the edge is required to be R≤2t (t is the wall thickness of the component), the deviation of the internal profile of the component is less than 0.2mm, and the maximum thinning rate of the wall thickness is less than 10%. Since the interior of such components is often washed by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D35/00
CPCB21D35/002
Inventor 刘钢王克环王东君
Owner HARBIN INST OF TECH
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