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A Liquid-Filled Deep Drawing Method for Improving Surface Accuracy of Large Thin-walled Curved Parts

A technology of liquid-filled deep drawing and curved surface parts, which is applied in the direction of forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems affecting the precision of the shape, improve the anti-instability and cracking ability, facilitate the process implementation, and avoid local accidents. wrinkled effect

Active Publication Date: 2016-03-09
抚顺三方机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the local wrinkling that is easy to occur in the deep drawing process of large complex curved parts affects the accuracy of the surface, this invention proposes a liquid-filled deep drawing forming method that uses the synchronous deformation of the auxiliary forming plate to realize the forming of the target forming plate

Method used

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  • A Liquid-Filled Deep Drawing Method for Improving Surface Accuracy of Large Thin-walled Curved Parts
  • A Liquid-Filled Deep Drawing Method for Improving Surface Accuracy of Large Thin-walled Curved Parts
  • A Liquid-Filled Deep Drawing Method for Improving Surface Accuracy of Large Thin-walled Curved Parts

Examples

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specific Embodiment approach 1

[0025] Specific implementation mode one: as Figure 1~5 As shown, the implementation process of a liquid-filled deep drawing forming method for improving the surface accuracy of large thin-walled curved parts described in this embodiment is as follows:

[0026] (1) Make a circular auxiliary forming sheet 1, draw concentric circles with a certain distance on it (the smaller the distance between the concentric circles, the better), such as figure 1 As shown, the points on the concentric circles are used as the wall thickness measurement points after forming;

[0027] (2) The mold is in the open state, and the liquid medium 5 is filled from the liquid filling hole 6 to the liquid filling chamber 4 through the external hydraulic pump, and the target forming sheet 2 and the auxiliary forming sheet 1 are stacked on the die 7 On the top, the auxiliary forming sheet 1 is placed on the target forming blank 2, with the concentric circle facing upward, and the blank holder 8 connected t...

Embodiment 1

[0033] Embodiment 1: The inner contour of the target formed part is a semi-ellipsoid, and the generatrix equation is The target forming sheet is 304 stainless steel with an elastic modulus of 190Gpa. The target forming sheet has an outer diameter of Φ2600mm and a thickness of 3mm; the auxiliary forming sheet is Q235 steel with an elastic modulus of 210Gpa. The auxiliary forming sheet has an outer diameter of Φ2600mm and a thickness of 5mm. The initial convex model surface in the forming process is a semi-ellipsoid, and the generatrix equation is

[0034] The forming process is as follows:

[0035] (1) Make a circular auxiliary forming sheet 1, draw concentric circles with a spacing of 10mm on it, as a positioning line for diameter and wall thickness measurement, such as figure 1 shown;

[0036] (2) The mold is in the open state, and the auxiliary forming sheet 1 and the target forming sheet 2 are centered on the die 7, the auxiliary forming sheet 1 is placed on the target...

Embodiment 2

[0041] Embodiment 2: the inner contour of the target formed part is a semi-ellipsoid, and the generatrix equation is The target forming sheet is 2195 aluminum alloy, with an elastic modulus of about 72GPa. The target forming sheet has an outer diameter of Φ4000mm and a thickness of 3mm; the auxiliary forming sheet is 45 steel, with an elastic modulus of about 210GPa, and the outer diameter of the auxiliary forming sheet is Φ4000mm, thickness 8mm. The initial convex model surface in the forming process is a semi-ellipsoid, and the generatrix equation is

[0042] The forming steps are exactly the same as in Example 1. Due to the changes in the material and specifications of the parts, the parameters of the forming are changed as follows:

[0043] In step (2): the mold is also composed of a left punch, a die, a blankholder, a liquid-filled chamber, etc., and the applied blankholder force is 3750KN, and a pressure of 5 MPa is established inside the liquid-filled chamber 4;

...

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Abstract

The invention discloses a hydro-mechanical deep drawing forming method capable of improving surface precision of a large-scale thin-wall curved-surface part, and relates to hydro-mechanical deep drawing forming methods. The problems that the curved-surface part is prone to be locally wrinkled and the surface precision is affected in the deep drawing process are solved. Concentric circles with certain distances are carved in the upper surface of an auxiliary forming sheet, the auxiliary forming sheet and a target forming sheet are stacked on a female die, and deep drawing forming is carried out on the auxiliary forming sheet and the target forming sheet. A gap generated by resilience of the auxiliary forming sheet and resilience of the target forming sheet is utilized for separating a deep drawing piece. The diameters and the thicknesses of the concentric circles of the deep drawing piece of the auxiliary forming sheet are measured. Normal inside offsetting is carried out on a molded surface generatrix of an initial deep drawing male die at the corresponding position. Fitting is carried out on an offset point, and the surface generatrix considering deformation and thinning of the auxiliary forming sheet can be obtained. According to the fitted surface generatrix, the initial deep drawing male die is finished, and an ideal deep drawing male die surface is obtained. Deep drawing forming and separation of the auxiliary forming sheet and the target forming sheet are carried out again, and the large-scale thin-wall curved-surface part with improved surface precision can be obtained.

Description

technical field [0001] The invention relates to a liquid-filled deep-drawing forming method for large-scale, thin-walled and curved plate parts. Background technique [0002] In the pressure vessels in the aerospace and petrochemical fields, the combined welding of the head and the barrel section constitutes the main structure of the pressure vessel, and this structural form is widely used. The shape of the head usually adopts a spherical or semi-ellipsoidal surface, and the diameter is generally more than 2000mm. It is a large thin-walled complex curved plate part. The above-mentioned heads are usually manufactured by spinning, but there are a series of problems: (a) When the blank is thin, it is easy to wrinkle or crack. The rotatable limit thickness-to-diameter ratio (ratio of blank thickness to diameter) is 3 / 1000, that is, the thickness of a blank with a diameter of 1000mm cannot be less than 3mm, otherwise wrinkling defects cannot be controlled. The thickness of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D26/021B21D22/20B21D37/10
Inventor 徐永超刘伟苑世剑
Owner 抚顺三方机械制造有限公司
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