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A precise plastic forming method for deep cup-shaped thin-walled parts

A technology of plastic forming and thin-walled parts, which is applied in the direction of household appliances, hollow objects, and other household appliances, etc., can solve the problems of increased processing cycle and cost, reduced internal grain structure performance, increased processing costs, etc., to achieve increased wall thickness Dimensional accuracy and uniformity of wall thickness, improved strength and fatigue life, and the effect of saving tooling costs

Active Publication Date: 2021-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current conventional manufacturing method of deep cup-shaped thin-walled parts is to use sheet blanks for stamping and deep drawing. However, since the drawing coefficients of deep cup-shaped parts exceed the limit drawing coefficient of the material, many For secondary drawing, multiple sets of drawing dies are manufactured, and an intermediate annealing process is often required, resulting in an increase in processing cycle and cost
[0004] Regardless of the number of times of deep drawing, there are some unavoidable shortcomings in the deep drawing process, such as poor wall thickness accuracy, low wall thickness uniformity, poor shape straightness and ellipticity, etc., and the material It is often deformed under the action of tensile stress, which can easily lead to a decrease in the performance of the internal grain structure and an increase in the tendency of micro-cracks, etc.
[0005] Deep cup-shaped thin-walled parts can also be prepared by bar cutting, which not only requires cutting a large amount of material, resulting in material waste and low processing efficiency, but also reduces the mechanical properties of the material due to the cutting of the fibers inside the bar
Also, because thin-walled parts are easy to deform when clamping, special fixtures are required, which further increases the processing cost

Method used

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  • A precise plastic forming method for deep cup-shaped thin-walled parts
  • A precise plastic forming method for deep cup-shaped thin-walled parts
  • A precise plastic forming method for deep cup-shaped thin-walled parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 A schematic diagram of the deep cups mentioned in the present invention;

[0041] The material is 08 steel, the outer diameter of the parts D = 80mm, the wall thickness T 0 = 0.6mm, height H = 110 mm. Calculation and design according to the flow of the forming process of the present invention, such as figure 2 Looking:

[0042] (1) Check the manual to know the trim margin: Δ = 5mm, so material volume: v ≈π (H + Δ + 0.25D) DT 0 = 20347mm 3 ; Plate blank initial diameter: D 0 = 2 [v / (πt 0 )] 1 / 2 ≈ 208mm. Deep depth coefficient: 80 / 208 ≈ 0.38, less than one pull-down shaped limit pulse factor 0.46 ~ 0.6, cannot be drawn once.

[0043] (2) Since the drawing of 08 steel is better, the depth coefficient m = 0.46 is selected for subsequent design, the slab thickness increase: △ T = (4VM 2 / π-d 2 t 0 ) / [d 2 (1-m 2 )] = 0.33mm, slab thickness: t 1 = T 0 + △ T = 0.93mm. Select T in the actual thickness series 1 = 1.0mm. Therefore, the correction Δt = 0.4mm, slab diamet...

Embodiment 2

[0052] figure 1 A schematic diagram of the deep cups mentioned in the present invention;

[0053] Material is 25 steel, the outer diameter of the parts D = 120mm, the wall thickness T 0 = 0.8 mm, height H = 350mm. Calculation and design according to the flow of the forming process of the present invention, such as figure 2 Looking:

[0054] (1) Check the manual to know the trim balance: Δ = 12mm, so material volume: v ≈π (H + δ + 0.25D) DT 0 = 118164mm 3 ; Plate blank initial diameter: D 0 = 2 [v / (πt 0 )] 1 / 2 ≈434mm. Deep depth coefficient: 120 / 434 ≈ 0.28, less than once the drawside is 0.46 ~ 0.6, which cannot be drawn once.

[0055] (2) Since the drawing of 25 steel is relatively poor, the depth coefficient m = 0.6 is selected for subsequent design, and the slab thickness increase is increased: △ t = (4VM 2 / π-d 2 t 0 ) / [d 2 (1-m 2 )] = 4.63mm, slab thickness: t 1 = T 0 + △ T = 5.43 mm. Select T in the actual thickness series 1 = 6.0 mm. Thus, after correction, Δt = 5.2mm,...

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Abstract

The invention discloses a precise plastic forming method for a deep cup-shaped thin-walled part. Composite spinning forming process is used for processing. First calculate the size of the sheet blank with a large thickness, then use deep drawing and spinning to obtain thick-walled shallow cup-shaped parts, use flow spinning to obtain thin-walled deep cup-shaped parts, and use trimming and spinning to trim the mouth of the part and use The lathe cuts the bottom thickness of the part, resulting in a precisely formed, thin-walled, deep cup-shaped part. Compared with the stamping and deep-drawing forming process and the cutting process method, the forming method of the present invention effectively reduces the number of tooling and improves the quality indicators such as processing efficiency and part forming accuracy.

Description

Technical field [0001] The present invention relates to the field of special processing of mechanical engineering, and more particularly to a precise plastic forming method of a deep cup thin wall member. Background technique [0002] The so-called dark cup refers to a stamped member that cannot be formed once a drawn, and precise forming means that the shape of the shape reaches a higher precision. The apparatus for deep cup-shaped walls is relatively widely used, and there is direct use of parts, as used as intermediate blanks. [0003] The current conventional deep cup thin wall member is made, and the plate blank is used to punching deep, but since the deep clarification coefficient of the deep cup exceeds the limit of the material, therefore Second to depth, manufacture multiple sets of drawings, and often need to adopt an intermediate annealing process, resulting in an increase in processing cycles and costs. [0004] Regardless of the number of decents, there are some inev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D35/00B21D22/16B21D22/21B21D51/10
CPCB21D22/16B21D22/21B21D35/003B21D35/005B21D51/10
Inventor 夏琴香杨前超程秀全肖刚锋程思竹边旭阳
Owner SOUTH CHINA UNIV OF TECH
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