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A thermoforming process and mold for inner and outer surface cross ribs for thin-walled cylindrical parts

A technology of inner and outer surfaces, thin-walled cylinders, applied in the direction of metal rolling, etc., can solve the problems of difficult to ensure the repeatability of longitudinal bars of cylindrical structural parts, difficult to predict the three-way flow of metal, and difficult to form cross bars, etc., to achieve debugging. It has the advantages of convenient process, solving geometric defects, and low manufacturing and maintenance costs.

Active Publication Date: 2021-08-03
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) The formed ring rib is characterized by a single rib, and it is difficult to form a cross rib
Because compared with single ribs, the three-way flow law of the metal in the deformation zone of the blank will be more difficult to predict, and the mechanism of the forming process will be more complicated, and the corresponding ring rolling parameters will also change accordingly.
[0006] In addition, in the ring rolling process, the longitudinal ribs will face overlapping problems during the forming process. Since the diameter of the billet is different from that of the roll, it is difficult to ensure the repeatability of the longitudinal ribs of the cylindrical structural parts

Method used

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  • A thermoforming process and mold for inner and outer surface cross ribs for thin-walled cylindrical parts
  • A thermoforming process and mold for inner and outer surface cross ribs for thin-walled cylindrical parts
  • A thermoforming process and mold for inner and outer surface cross ribs for thin-walled cylindrical parts

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Effect test

Embodiment 1

[0038] like figure 1 As shown, it is the first forming process of the present invention. The main structure shown in the figure is a radial rotary extrusion die. The die is mainly divided into four parts. The inner mold 4 is embedded in the outer mold 5, and the two are assembled in an L-shaped manner; the split inner mold 4 is composed of a base and four split molds, and this structure can ensure convenient demoulding after the test; the heating resistors 7 are evenly distributed in the split Around the inner mold, 12 heating resistors are distributed at intervals of 30 degrees on the circumference, and each heating resistor corresponds to a pair of sheet molds 3 with cross ribs; the cylindrical structural member 8 is installed in the middle of the sheet mold 3, and The diameter is the same as the inner diameter of the sheet mold 3, both of which are 200mm; the sheet mold 3 is composed of an inner and outer sheet mold, and the outer wall of the inner sheet mold has any cross ...

Embodiment 2

[0043] like figure 2As shown, it is the second forming process of the present invention. The main structure shown in the figure is a radial rotary extrusion die 9, a half-open induction heater 10, and a PID constant temperature control box 11. Among them, the biggest difference between the radial rotary extrusion die 9 and the first process is that there is no need to use a built-in heating resistor, and the internal part body mold 4 cancels the prefabricated hole of the heating resistor, and its structure also adopts a combination of a base and four split molds. This structure It can ensure the convenience of demoulding after the test; the outermost part is the integral outer mold 5, which is also the main load-bearing component; the split inner mold 4 is embedded inside the outer mold 5, and the two are assembled in an L-shaped manner; the cylindrical structural part 8 is installed In the middle of the sheet mold 3, its outer diameter is the same as the inner diameter of th...

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Abstract

The invention discloses a thermoforming process and mold for cross ribs on the inner and outer surfaces of thin-walled cylindrical parts. The invention realizes the high-temperature radial rotary extrusion forming process in two ways. Compared with the radial rotary extrusion forming at normal temperature, it can To achieve the goal of integrated forming of double-sided arbitrary cross high rib features of thin-walled cylindrical structural parts. The mold of the present invention includes an outer mold used as a bearing member, an inner film is embedded inside the outer mold, a number of heating resistors are arranged inside the inner membrane, and a sheet mold is arranged inside the heating resistor, The thin-walled cylindrical part is installed in the sheet mold, and a cross-rib die is arranged on the inner and outer walls of the sheet mold, and the cross-rib die is used to form cross ribs on the inner and outer walls of the thin-walled cylindrical part.

Description

technical field [0001] The invention relates to the field of metal thermoforming, in particular to a thermoforming process and mold for inner and outer surface cross-rib thermoforming of thin-walled cylindrical parts. Background technique [0002] At present, the ring rib feature can be formed on the outer wall of the structural part through the ring rolling technology. The method is mainly to drive the driving roll to rotate and press down through the ring rolling machine to realize the continuous incremental plastic forming of the billet. The principle is to combine the ordinary driving roll and the passive roll Change to a roll with a ring rib feature, and control the circumferential flow of the material at the initial stage to increase the diameter of the entire ring. When the outer wall of the ring is in contact with the passive roll, the metal radial flow in the blank deformation zone will dominate, and the material will flow to The position of the ring rib, thereby fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21H1/06
Inventor 何霁冯彬李淑慧赵亦希于忠奇
Owner SHANGHAI JIAOTONG UNIV
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