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Fixed roll radian-change bending-point position cold-bending shaping process

A cold-formed, roll-fixed technology, applied in the field of cold-formed steel roll forming technology, can solve problems such as roll sharing design limitations, cracking, micro-cracks, etc., to reduce roll investment, reduce production costs, and form natural smoothness Effect

Inactive Publication Date: 2004-09-15
BAOSTEEL GRP NANTONG WIRE PROD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the force of the roll during the bending process is always concentrated at one point. Excessive stress concentration often causes microcracks during the bending process of thick-walled (above 12.7mm) profiles, which may lead to cracking in severe cases.
And due to the different bending arcs of products with different wall thickness, it brings restrictions on the common design of rolls

Method used

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  • Fixed roll radian-change bending-point position cold-bending shaping process
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  • Fixed roll radian-change bending-point position cold-bending shaping process

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Embodiment Construction

[0016] The following describes in detail the implementation of the cold-bending forming process of changing the position of the inflection point of the fixed roll radian in conjunction with the accompanying drawings. The cold-bending forming process of changing the position of the bending point with the radian of the fixed roll relates to the roll-bending process of cold-formed steel. It adopts the roll bending forming process of fixing the radian of the roll and changing the position of the bending point of the upper roll.

[0017] According to the minimum wall thickness in the product outline of the production unit, the present invention determines the bending radians of the corners of the rolls, and the upper rolls of all actual bending passes take this radian. The bending radian and forming angle of the raw material corner are determined according to the inner arc of the finished product with different wall thickness (considering the appropriate welding extrusion amount an...

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Abstract

The invention is a cold-bending molding technique of fixing roller arc and changing bend-point position, according to the minimum wall thickness in set product outline, determining angular bending arc of the roller, making all the top rollers in the curves adopt the bending arc, determining the bending molding angle of the raw material plate according to inner circular arcs of the finished products of different wall thicknesses, making the unbended raw material of each angle remained on the bottom pate, making each bending point gradually move toward the bottom plate during roll bending, and finally completing the whole bending process. The molding is natural and smooth, able to effectively resolve the angular microcrack. It saves roller-changing time.

Description

(1) Technical field [0001] The invention relates to a roll bending forming process of cold-formed steel, in particular to a cold-forming process in which the radian of a fixed roll changes the bending point position in the roll forming process of cold-formed steel. (2) Background technology [0002] A typical cold-formed steel unit is mainly composed of several archway racks arranged vertically, with auxiliary equipment such as raw material preparation, looper, high-frequency welding machine, flying saw, etc., to complete the production process from raw material coils to finished cold-formed profiles. This forming process is to continuously and gradually bend the raw material flat plate into the required cross-sectional shape through the roller molds arranged longitudinally and sequentially on the archway frame. [0003] At present, in the roll forming process, the traditional process adopts the fixed bending point position variable bending radian method in the corner formin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/02
Inventor 郁竑钱伟中唐宇翚马越峰
Owner BAOSTEEL GRP NANTONG WIRE PROD
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