Variable speed and variable blank holder force linked sheet drawing process

A blank holder force and sheet metal technology, which is applied in the field of sheet metal deep drawing technology with variable speed and variable blank holder force linkage, can solve the problem of forming quality of parts that affect the forming performance of sheet metal, fixed and unadjustable slider motion mode, and circular die. cracks and other problems in the corners, to overcome the high cost and low efficiency, easy to implement, and improve the forming ability.

Active Publication Date: 2013-03-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional sheet metal deep drawing forming process is limited by the equipment conditions, and the movement mode of the slider during the deep drawing process is fixed and cannot be adjusted; in the bending and reverse bending stages, due to the high forming speed, the plastic flow of the sheet cannot occur well, Easy to produce cracks at the rounded corners of the die
At the same time, the speed control mode and blank holder force control mode used in the traditional deep drawing process seriously affect the formability of the sheet metal and the forming quality of the parts

Method used

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  • Variable speed and variable blank holder force linked sheet drawing process
  • Variable speed and variable blank holder force linked sheet drawing process
  • Variable speed and variable blank holder force linked sheet drawing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The drawing sheet C adopts B340 / 590DP steel plate, the blank diameter D is 185mm, the plate thickness t is 1mm, and the tensile strength Rm of the B340 / 590DP sheet is 612.5Mpa. figure 1 As shown (in mm), the diameter d of the punch A is 100mm, and the fillet radius of the punch A is R p 9.5mm, die B fillet radius R d is 8mm.

[0034] Firstly, determine the basic parameters in the deep drawing process of sheet metal C.

[0035] (1) In this example, the mold is installed on the working table of a 1000KN servo press, and the sheet is placed on the mold. The position when the slider of the servo press starts to contact the sheet is recorded as the initial drawing position, which is the starting point of the forming speed setting.

[0036] (2) Punch fillet radius R p 9.5mm, die fillet radius R d is 8mm, and the sheet thickness t is 1mm, so the turning point S of the change of speed and blank holder force k =R p +R d +t=18.5mm.

[0037] (3) The constant limit drawing...

Embodiment 2

[0043] The deep drawing sheet adopts B340 / 590DP steel plate, the diameter of the blank is 190 mm, and the thickness of the plate is 1 mm. The mold used for forming is the same as that of Example 1. The curves of variable speed and variable blank holder force are as follows image 3 shown.

[0044] (1) In this example, the mold is installed on the working table of a 1000KN servo press, and the sheet is placed on the mold. The position at which the servo press slide begins to contact the sheet is recorded as the initial drawing position.

[0045] (2) Punch fillet radius R p 9.5mm, die fillet radius R d is 8mm, and the sheet thickness t is 1mm, so the turning point S of the change of speed and blank holder force k =R p +R d +t=18.5mm.

[0046] (3) The constant limit drawing speed v of sheet metal is 30mm / s.

[0047] (4) The speed change motion curve of the slider is 20 / 60mm / s, which represents the initial drawing position S from the initial drawing position to the change of ...

Embodiment 3

[0051] The deep-drawing sheet is made of H380 steel plate, the blank diameter D is 190mm, the thickness t is 1mm, and the tensile strength Rm of the sheet is 483Mpa. figure 1 Shown (in mm).

[0052] The mold used for forming is identical to embodiment 1, and the variable speed and variable blank holder force curves are as follows Figure 4 shown.

[0053] (1) In this example, the mold is installed on the working table of a 1000KN servo press, and the sheet is placed on the mold. The position at which the servo press slide begins to contact the sheet is recorded as the initial drawing position.

[0054] (2) The turning point S of the change of speed and blank holder force k = R p +R d +t=18.5mm.

[0055] (3) The constant limit drawing speed v of sheet metal is 45mm / s.

[0056] (4) The speed change motion curve of the slider is 30 / 70mm / s, which represents the initial drawing position S from the initial drawing position to the change of speed and blank holder force k The ...

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Abstract

The invention discloses a variable speed and variable blank holder force linked sheet drawing process. The process comprises the following steps of: performing low-speed drawing on a sheet at a severe deformation stage to guarantee that the sheet has sufficient time for plastic flowing; performing a subsequent forming stage by using higher forming speed to increase the forming efficiency; and meanwhile, realizing speed control over a sheet forming process in coordination with different blank holder forces. According to the process, the forming capacity of the sheet and the forming quality of a part are improved, variable speed and variable blank holder force are easy to realize in a forming process, the process is simple, the operability is high, and the problems of complex mold testing process, high cost and low efficiency of qualified parts existing in the conventional drawing process through repeated mold testing and repair are solved.

Description

technical field [0001] The invention relates to sheet metal deep-drawing forming technology, in particular to a sheet metal deep-drawing process linked by variable speed and variable blank-holding force. According to the deformation characteristics of parts at different stages, the process uses variable-speed and variable blank-holder force linked deep-drawing forming. Background technique [0002] Deep drawing process is one of the most basic processes of sheet metal forming. It is used to form open hollow parts or combine with other processes to form sheet metal parts with more complex shapes. It is widely used in automobile, aerospace and other manufacturing fields. [0003] During deep drawing, the sheet metal is first bent and deformed by the punch, and then straightened and pulled into the gap between the convex and concave dies. At this stage, the sheet is subjected to simultaneous bending and reverse bending, and the deformation is more severe. The traditional sheet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/20
Inventor 李建军付秀娟刘倩黄亮
Owner HUAZHONG UNIV OF SCI & TECH
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