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Method for pre-stretch bending of metal thick slab and numerical control machining forming of high-rib wallboard with curvature

A technology for processing and forming thick slabs, which is used in the pre-stretching and bending of metal thick slabs and the CNC machining and forming of high-curvature wall panels, metal forming internal stress control and CNC machining. It can solve the problem of strong dependence on operator experience. , large residual stress, low production efficiency, etc., to ensure product quality and process stability, reduce workload, and improve production efficiency.

Inactive Publication Date: 2013-05-08
SHENYANG AEROSPACE UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to address the deficiencies of the above-mentioned prior art, and provide a method for pre-bending metal thick plate blanks and CNC machining and forming methods for high-rib wall panels with curvature. As a result, the high risk of panel forming, large residual stress, poor surface streamlines, low production efficiency and technical problems that rely heavily on the experience of operators during production

Method used

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  • Method for pre-stretch bending of metal thick slab and numerical control machining forming of high-rib wallboard with curvature
  • Method for pre-stretch bending of metal thick slab and numerical control machining forming of high-rib wallboard with curvature

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Embodiment 1

[0011] refer to Figure 1-2 , implement pre-stretch bending and numerical control machining forming on the metal thick plate blank, the main forming process of the method includes pre-stretching bending of the metal thick plate blank and precise numerical control machining forming of the curved high-rib wall plate. The specific implementation process: first obtain the alloy slab after rolling, forging and heat treatment. Then fix the alloy slab on the chuck of a CNC stretch bending machine with a capacity of more than 100 tons, and pre-bend the alloy slab with an elongation rate of 1-10% according to the requirements, so that the shape is similar to that of the finished wall plate, and the residual stress A pre-stretched slab less than or equal to the measured value of an existing pre-stretched slab. Finally, CNC machining is carried out on the pre-stretch bending slab, and the machining environment, machining process and machining parameters are controlled. Finally, the dime...

Embodiment 2

[0013] refer to figure 1 , first obtain the alloy slab after rolling, forging and heat treatment. Then the alloy slab is fixed on the chuck of a numerically controlled stretch bending machine of more than 100 tons; the alloy slab is subjected to a combination of stretching and bending with an elongation of 1-10% according to the shape of the wall plate and the distribution of residual stress Pre-bending deformation method. Finally, a pre-stretched bent slab whose shape is similar to that of the finished product and whose residual stress is less than or equal to the actual measured value of the existing pre-stretched slab is obtained.

Embodiment 3

[0015] refer to figure 2 , first obtain the alloy slab after stress relief. Then use high-precision CNC machining machine tools to implement CNC machining on the slab through rough machining, semi-finishing, and finishing processes. Ambient temperature for controlling processing: -30°C to +50°C, spindle speed: 500-20000r / min, feed speed: 1-120m / min, feed angle: 0.1-90°, and according to the tool material and shape size Properly select the tool path, cutting depth and width and the clamping posture of the blank based on factors such as the processed material and shape size, the residual stress distribution in the processed blank, and the process of the processed blank. Finally, a wall panel with a dimensional accuracy of 0.01-5mm, a smooth outer surface, and a design theoretical shape is obtained. The outer surface of the wallboard is a curved surface, and the inner surface is composed of ribs 1 and grooves 2, which is an integral wallboard with curvature and high ribs. The...

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Abstract

The invention relates to a method for pre-stretch bending of a metal thick slab and numerical control machining forming of a high-rib wallboard with curvature, and mainly solves the problems that residual stress is high, the streamline of a molded surface is poor, deviation between an actual curved surface shape and a theoretical shape is large and the like in the conventional forming method. The method mainly comprises the following steps of: the pre-stretch bending of the metal thick slab, and the numerical control machining forming of the high-rib wallboard with the curvature. The method aims to greatly reduce the workload of the subsequent assembly process, improve production efficiency and whole quality and prolong service life. The residual stress in the slab is controlled by stretching and bending deformation modes in the pre-stretch bending process, so that the shape of the slab is approximate to the curved surface shape of the wallboard; the release process of the residual stress is controlled, and new residual stress is not generated or a little new residual stress is generated by controlling numerical control machining environment, process and parameters in the wallboard forming process, so that the forming quality of the wallboard is ensured; and numerical control machining is used as the final process of wallboard production in the method, so that product quality and process stability can be ensured to a great extent, and the designed theoretical shape of the wallboard can be ensured to the greatest extent.

Description

technical field [0001] The invention relates to metal forming internal stress control and numerical control processing technology, in particular to a method for pre-bending a thick metal plate blank and a numerical control processing forming method for a curved high-rib wall plate. It belongs to the technical field of mechanical processing and application. Background technique [0002] The integral wall panel has many advantages such as smooth surface, high structural strength, good air tightness, and can effectively reduce the structural weight. It has been widely used in various fields such as modern aviation, aerospace, high-speed trains, high-end automobiles, and military equipment. At present, the integral wall panels are generally obtained by plane numerical control milling of pre-stretched panels. Some of them are high-rib wall panels that require a certain shape curvature, and the finished wall panels are finally obtained through gate pressure, shot peening, creep f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 王哲峰朴凤贤胡耀阳王哲英马明旭
Owner SHENYANG AEROSPACE UNIVERSITY
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