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Pipe rod bar with major diameter double-roller unbender concave roller curve

A roll-shaped curve and large-diameter tube technology, which is applied in metal processing equipment, forming tools, manufacturing tools, etc., can solve problems such as drift accidents, concave roll curves that cannot meet the straightening quality, etc., and achieve a wide range of use, Improve straightening quality and facilitate processing

Inactive Publication Date: 2008-02-06
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the prior art that the concave roll profile curve is difficult to meet the straightening quality and the tail flicking accidents are prone to occur, the present invention provides a concave roll profile profile curve of a large-diameter tube / bar two-roll straightening machine

Method used

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  • Pipe rod bar with major diameter double-roller unbender concave roller curve

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Experimental program
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Effect test

Embodiment 1

[0022] when pipe diameter d min =100mm, the maximum angle α between the straightening roller and the straightening direction max When = 20°, the value of each parameter in the roll curve is calculated as follows:

[0023] R1=16×100×π×tg20°=1827.58;

[0024] R2=24×100×π×tg20°=2741.37;

[0025] R3=40×100×π×tg20°=4568.949;

[0026] R4=2.4×100×π×tg20°=274.137;

[0027] R5=30mm;

[0028] L1=1.6×100×π×tg20°=182.758;

[0029] L2=3.2×100×π×tg20°=365.5159;

[0030] L3=4.8×100×π×tg20°=548.2739;

[0031] L4=6.4×100×π×tg20°=731.0319;

[0032] L5=7.6×100×π×tg20°=868.1004.

[0033] Take the roller-shaped symmetry line as the axis of symmetry, make the arc AA / 2 tangent to the arc AB, the arc AB to the arc BC, the arc BC to the oblique line CD, and the oblique line CD to the arc DE Tangent, tangent between arc DE and arc EF can get the generatrix of concave roll curve. Each parameter can be rounded up in a specific application.

[0034] The DC section of the concave roll entrance ...

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Abstract

The invention discloses a roll shape curve of the concave roll of a two-roll straightener of major diameter tube / bar materials. The invention is characterized in that: a roll shape symmetrical line is taken as the symmetry axis; the roll shape curve of the concave roll comprises three segments of a circular arc of unequal radial R1-R3, a segment of a virgule CD, a segment of a reversal circular arc R4 and a transitional circular arc R5; various segments of the circular arcs and the virgule are tangent on a straightening roll bus bar and are connected with each other smoothly; the radials of various segments of the circular arcs are calculated as follows: R1-R3=X1*dmin*pi*tg alpha max, R4=X2*dmin*pi*tg alpha max, R5=(20-50)mm; and the projected length in the horizontal direction with the radials of various segments of the circular arcs corresponding to the virgule is calculated as follows: L1-L5=Y*dmin*pi*tg alpha max. The invention has the advantages of easy manufacture, capacity of significantly improving the straightening quality and working efficiency of a product and significantly reducing whipping phenomenon at the same time, particularly adaptable for the straightening processing of major diameter tube / bar materials of phi100-200 mm.

Description

technical field [0001] The invention relates to the technical field of metallurgical machinery, in particular to a concave roll profile curve of a large diameter (Φ100-200mm) tube / bar two-roller straightening machine Background technique [0002] The two working rolls of the two-roll straightening machine are arranged crosswise along the axial direction, and the two straightening rolls are convex and concave, and rotate in the same direction. The pipes and bars to be straightened are advanced spirally between the roll gaps, and are repeatedly bent under the action of the roll shape curve during the forward process to achieve the purpose of straightening. The two-roll straightening machine has the characteristics of high straightening precision and has been widely used in developed countries. The two-roller straightening machine patented technology (patent No. US4176537) of British Bronx (BRONX) company discloses the technical characteristics such as arrangement form, transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/02B21D37/00
CPCB21D3/02
Inventor 孙登月许石民陈国林
Owner YANSHAN UNIV
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