Method and device for preparing tube blank by means of differential temperature pushing from equal circular cross section to variable square cross section

A cross-section, square technology, applied in the direction of manufacturing tools, metal processing equipment, forming tools, etc., can solve the problems of uneven structure and performance of the blank workpiece, actual production obstacles, easy cracks, etc., to achieve good deformation, increase plasticity, increase The effect of tensile strength

Inactive Publication Date: 2012-08-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing pushing process, when the blank passes through the rounded corners of the mold to form a flange, a large plastic deformation occurs, and the blank on the side of the mold bears a large tensile stress. Therefore, the existing pushing process has the largest The disadvantage is that the structure and properties of the obtained tube blank workpiece are not uniform: the forming structure and properties of the tube wall are relatively uniform, while the flange is prone to cracks or thinning. This phenomenon occurs when the wall thickness of the workpiece is relatively thin. Chances are high, because it creates a real production hindrance

Method used

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  • Method and device for preparing tube blank by means of differential temperature pushing from equal circular cross section to variable square cross section
  • Method and device for preparing tube blank by means of differential temperature pushing from equal circular cross section to variable square cross section
  • Method and device for preparing tube blank by means of differential temperature pushing from equal circular cross section to variable square cross section

Examples

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Effect test

no. 1 example

[0040] In this embodiment, the method for preparing a tube billet by differential temperature pushing from a circular section to a variable square section includes the following steps:

[0041] 1) Pushing of the cylindrical section 11: After putting the hollow cylindrical shell 4 on the cylindrical section 11 of the pushing mold 1, turn on the heating jacket 7, heat the shell 4 to 350°C, and keep it warm for 6s. Turn off the heating jacket 7. Heating the billet 4 is used to increase the plasticity of the billet 4 to prepare for subsequent deformation.

[0042] 2) Pushing of the transition section 12: load, push the transition section 12 from the shell 4 to the pushing mold 1 at a speed of 40mm / s, and at the same time turn on the annular heating device 2 to keep the temperature of the shell 4 at 350°C to complete the transition After the stage of pushing deformation, stay for 6s. Such as Figure 6 As shown, the pressing machine 8 is used to apply a pushing force to the shell...

no. 2 example

[0050] In this embodiment, the method for preparing a tube billet by differential temperature pushing from a circular section to a variable square section includes the following steps:

[0051] 1) Pushing of the cylindrical section 11: After putting the hollow cylindrical tube blank 4 on the cylindrical section 11 of the pushing mold 1, turn on the heating jacket 7, heat the tube blank 4 to 340°C, and keep it warm for 8s. Turn off the heating jacket 7. Heating the billet 4 is used to increase the plasticity of the billet 4 to prepare for subsequent deformation.

[0052] 2) Pushing of the transition section 12: load, push the transition section 12 from the shell 4 to the push mold 1 at a speed of 45mm / s, and at the same time turn on the annular heating device 2 to keep the temperature of the shell 4 at 370°C to complete the transition After the stage of pushing deformation, stay for 7s. Such as Figure 6 As shown, the pressing machine 8 is used to apply a pushing force to th...

no. 3 example

[0060] In this embodiment, the method for preparing a tube billet by differential temperature pushing from a circular section to a variable square section includes the following steps:

[0061] 1) Pushing of the cylindrical section 11: After the hollow cylindrical shell 4 is set on the cylindrical section 11 of the pushing mold 1, the heating jacket 7 is turned on, and the shell 4 is heated to 360°C and kept warm for 7s. Turn off the heating jacket 7. Heating the billet 4 is used to increase the plasticity of the billet 4 to prepare for subsequent deformation.

[0062] 2) Pushing of the transition section 12: load, push the transition section 12 from the shell 4 to the push mold 1 at a speed of 43mm / s, and at the same time turn on the annular heating device 2 to keep the temperature of the shell 4 at 400°C to complete the transition After the stage of pushing deformation, stay for 8s. Such as Figure 6 As shown, the pressing machine 8 is used to apply a pushing force to the...

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Abstract

The invention discloses a method for preparing a tube blank by means of differential temperature pushing from an equal circular cross section to a variable square cross section. The method includes the steps: 1) heating a cylindrical section; 2) pushing a transitional section; 3) pushing the variable square cross section by turning on a linear heating device, keeping the temperature of a flange of the tube blank range from 350 DEG C to 400 DEG C, pushing the tube blank at the speed of 25-30mm/s until forming and then unloading; and 4) turning off an annular heating device and the linear heating device and performing ejection. A device for preparing the tube blank by means of differential temperature pushing from the equal circular cross section to the variable square cross section comprises a heating sleeve, the annular heating device and the linear heating device, wherein the heating sleeve is arranged outside the cylindrical section in a surrounding manner, the annular heating device is arranged on the outer side of the transitional section in a surrounding manner, and the linear heating device extends along a filleted flange of the variable square cross section. By the aid of the method, the tube blank can simultaneously have fine plastic deformation at the flange and better tensile strength on a tension side of a mould, cracking or thinning of the tube blank during pushing can be assuredly avoided, and the quality of the tube blank is improved.

Description

technical field [0001] The invention relates to a method and a device for preparing a tube blank, in particular to a method and a device for preparing a tube blank by differential temperature pushing from a circular section to a variable square section. Background technique [0002] like figure 1 As shown, it is a shell blank from an axially equal circular section to a variable square section manufactured by the pushing method. The shell blank has a large external dimension and belongs to a large variable square section thin-walled shell. The maximum side of the variable square section of the billet can be as long as 1000mm, while the minimum diameter at the circular section is only 300mm, and the overall height is about 1250mm. Viewed from the height direction, the billet can be divided into three parts, the first part is a circular cross section, the third part is a variable square cross section, and the second part is a transition stage between a circular cross section a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D31/00B21D37/16
Inventor 权国政吕文权余春堂夏玉峰周杰
Owner CHONGQING UNIV
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