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Method for precision forming of concave-bottom and thin-wall cylindrical part with large length and diameter ratio

A technology with high slenderness ratio and precision forming, applied in the field of precision forming of parts, which can solve the problems of low forming precision, high forming precision and limited forming limit.

Active Publication Date: 2015-04-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional spinning forming technology, such as ordinary spinning forming has limited limit, and the forming accuracy is not high due to springback; strong spinning can only form conical and cylindrical parts, but the forming accuracy is high

Method used

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  • Method for precision forming of concave-bottom and thin-wall cylindrical part with large length and diameter ratio
  • Method for precision forming of concave-bottom and thin-wall cylindrical part with large length and diameter ratio
  • Method for precision forming of concave-bottom and thin-wall cylindrical part with large length and diameter ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A high-voltage electrical switch shield, made of 1060 aluminum, shaped like figure 1 As shown, the straight section ( figure 1 Part A) Diameter D=190±1mm, length L=400mm, concave bottom diameter d=56±0.5mm, wall thickness t=2mm, this part is used to shield the external magnetic field and electric field to ensure stable operation of high-voltage electrical switches. The specific steps of spinning forming are as follows:

[0072] 1. Blank calculation: The wall thickness of the part is 2mm. Considering that the wall thickness will be reduced to a certain extent during the processing, the blank thickness should be greater than 2mm. The 1060 aluminum plates currently available on the market mainly have 3mm and 4mm specifications.

[0073] According to the principle of constant volume, the diameters of the blanks when using 3mm and 4mm slabs are 450mm and 405mm respectively, and the spinning coefficients when using 3mm slabs are 0.418 respectively. 0.45 (i.e. 192 / 405 = 0.464) sa...

Embodiment 2

[0082] A high-voltage electrical switch shield, made of aluminum alloy and shaped like figure 1 As shown, the straight section ( figure 1 Part A) diameter D=240±1mm, length L=300mm, concave bottom diameter d=53±0.5mm, length l=12mm, the overall wall thickness of the part is t=2mm, the specific steps are as follows:

[0083] 1. Billet calculation: According to the principle of constant volume, the diameter of the billet when using 3mm slab is 500mm, and the spinning coefficient is 0.48> 0.45, the thinning rate during powerful spinning is 33%> 10% (1mm / 3mm=33%), which satisfies the principle of deformation distribution.

[0084] 2. Concave bottom spinning forming:

[0085] The forming method is the same as in Example 1. A spinning core mold with the same contour as the concave bottom is designed and installed on the spindle of the machine tool. The specification is The aluminum slab is fixed between the core mold and the tail top with a diameter of 53mm. According to the preparation...

Embodiment 3

[0092] A high-voltage electrical switch shield, made of aluminum alloy and shaped like figure 2 As shown, the diameter of the straight cylinder is D=250±1mm, the length L=400mm, the wall thickness t1=2mm, the concave bottom diameter d=60±0.5mm, the length l=20mm, and the wall thickness t2=4mm, the specific steps are as follows:

[0093] 1. Billet calculation: According to the principle of constant volume, the diameter of the billet when using 4mm slab is 512mm, and the spinning coefficient is 0.49> 0.45, the thinning rate when strong spinning is 50%> 15% (2mm / 4mm=50%), which satisfies the principle of deformation distribution.

[0094] 2. Concave bottom spinning forming:

[0095] Design a spinning mandrel with the same contour as the concave bottom, install it on the spindle of the machine tool, and set the specification as The aluminum slab is fixed between the core mold and the tail top with a diameter of 60mm. According to the preparation method of the general rotation trajector...

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Abstract

The invention discloses a method for precision forming of a concave-bottom and thin-wall cylindrical part with large length and diameter ratio. The method comprises the following steps of firstly, calculating the size of a plate blank; then, forming the concave bottom, performing deep drawing and spinning to form a cylindrical blank, and performing spinning and thinning on the blank to reach the specified size; performing subsequent universal processing to meet the requirement of part size; in the deep drawing and spinning process of the cylindrical blank, turning the blank with the formed concave bottom, fixing between a tail jack and a code die, preparing a common spinning track by a common spinning track preparation method, enabling a main shaft to drive the blank to rotate, enabling a rotary wheel to feed according to the prepared track under the drive action of a numerical control system, using the first 6-8 passes of the spinning track as the simple reciprocating spinning, using the subsequent passes of the spinning track as the spinning track combined with the reciprocating travel, and performing the deep drawing and spinning on the blank to form the cylindrical part. The method has the advantages that by utilizing multiple times of deep drawing and spinning, the cylindrical blank is obtained, and then the spinning and thinning are performed on the blank to reach the specified size; by utilizing the characteristics of strong spinning and high accuracy, the wall thickness of the manufactured part is uniform, the surface quality is high, the compactness is good, and the number of defects is fewer.

Description

Technical field [0001] The invention relates to a precision forming method of parts, in particular to a precision forming method of a thin-walled curved female part with a concave bottom, which belongs to a plastic processing method of mechanical engineering. Background technique [0002] Concave bottom means that a part of the bottom of the part is lower than the surrounding area, forming a bottom similar to a "crater" shape. Large slenderness ratio cylindrical member means that the ratio of the length to the diameter of the cylindrical member is greater than or equal to 1.5. Due to the limited forming limit of the traditional deep drawing process, the forming method of thin-walled cylindrical parts with large slenderness ratio and concave bottom has been: the curved bus bar with concave bottom is formed by deep drawing, and the straight cylinder section is welded. Group welding is carried out after segmented forming, but the dimensional accuracy of the parts is difficult to me...

Claims

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Application Information

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IPC IPC(8): B21D22/14
CPCB21D22/14
Inventor 肖钢锋夏琴香程秀全杨琛
Owner SOUTH CHINA UNIV OF TECH
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