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Design method of subdivision-combination recipient under full prestressing field and structure thereof

A combined structure and extrusion cylinder technology, applied in metal extrusion forming tools, metal extrusion, metal processing equipment and other directions, can solve the design and manufacturing difficulties of combined cylinders and other problems, achieve compact structure, strong bearing capacity, reduce The effect of manufacturing cost

Inactive Publication Date: 2010-11-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for large-tonnage extrusion machines, the weight of the extrusion cylinder generally exceeds 100 tons, and it is very difficult to design and manufacture the combination cylinder.

Method used

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  • Design method of subdivision-combination recipient under full prestressing field and structure thereof
  • Design method of subdivision-combination recipient under full prestressing field and structure thereof
  • Design method of subdivision-combination recipient under full prestressing field and structure thereof

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Embodiment Construction

[0021] Taking the design of the 360MN circular extruding barrel as an example, the technical scheme of applying the present invention is as follows:

[0022] 1) As attached image 3 After selecting the material of each layer of the extrusion cylinder and the steel wire for winding, the size of the extrusion machine frame and the size of the processed blank can be determined r b , r a , and the maximum internal pressure p is known amax , according to the principle of equal shear stress winding and no tensile stress on the inner wall, the thickness of the steel wire winding layer and the winding initial tension of each layer can be obtained.

[0023] 2) The thickness of each layer is selected comprehensively considering the force, heat and manufacturing difficulty.

[0024] 3) Complete the prestressed steel wire winding step of the extrusion cylinder according to the tension steps.

[0025] 4) It is also possible to wind the outer cylinder and the inner lining first, and the...

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Abstract

The invention relates to a subdivision-combination recipient wound by prestressed steel wire, a novel design method of a recipient and a novel structure thereof in metal extrusion process. The method comprises the following steps: adopting a steel wire wrapping layer outside a recipient body to form a full presressing field so as to enable an ouster cylinder, a middle lining and an inner lining to be in stress state during both prestressing and operation to separate the prestressed cylinder layer into a plurality of blocks, then winding the steel wires into a whole, and enabling the stressing condition of the wound cylinder to be the same as that of the whole cylinder. Compared with the traditional multilayer combination recipient, the subdivision-combination recipient wound by prestressed steel wire has higher carrying capacity and longer fatigue life, the subdivision-combination structure obviously reduces the manufacturing difficulty and cost of the recipient, and the invention has excellent application prospect in the recipient manufacturing of large-tonnage extruders.

Description

technical field [0001] The invention belongs to a design method of a prestressed combined extrusion cylinder, and is especially suitable for the design of the extrusion cylinder of a large-tonnage metal extrusion machine. Background technique [0002] The extrusion cylinder is the core component of the extrusion machine, and its load capacity, fatigue life, economy and compact structure have high requirements. The traditional extrusion cylinder mainly adopts a multi-layer composite cylinder structure. The structure is a self-tightening structure, and its principle is to use the interference fit of the inner and outer layers to generate a pre-tightening force on the inner layer. According to the selection of the pre-tightening coefficient, the pull-down stress of the inner wall can be made to be small or even have no pull-down stress under working conditions. as attached figure 1 . When there is no tensile stress under working conditions, the inner lining can be made into...

Claims

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Application Information

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IPC IPC(8): B21C25/00
Inventor 吴任东张磊王雪凤
Owner TSINGHUA UNIV
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