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

A large-diameter tube and concave roll technology, which is applied in the field of concave rolls of large-diameter tube/bar two-roll straightening machines, can solve the problems of tail flicking accidents, the roll shape curve of concave rolls is difficult to meet the straightening quality, etc., and reaches the application range. Wide, improve straightening quality, convenient processing effect

Inactive Publication Date: 2009-11-04
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of the existing technology that the concave roll curve is difficult to meet the straightening quality and the tail-flicking accidents are easy to occur, the invention provides a large-diameter tube / bar two-roll straightening machine concave roll

Method used

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

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Embodiment 1

[0029] 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:

[0030] R1=16×100×π×tg20°=1827.58;

[0031] R2=24×100×π×tg20°=2741.37;

[0032] R3=40×100×π×tg20°=4568.949;

[0033] R4=2.4×100×π×tg20°=274.137;

[0034] R5=30mm;

[0035] L1=1.6×100×π×tg20°=182.758;

[0036] L2=3.2×100×π×tg20°=365.5159;

[0037] L3=4.8×100×π×tg20°=548.2739;

[0038] L4=6.4×100×π×tg20°=731.0319;

[0039] L5=7.6×100×π×tg20°=868.1004.

[0040] 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.

[0041] The DC section of the entrance and exit of t...

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Abstract

The invention discloses a concave roll of a two-roller straightening machine for large-diameter pipe / rod. Reverse arc DE and a section of transition arc EF are composed, where the radius of arc AA is R1, the radius of arc AB is R2, the radius of arc BC is R3, the radius of arc DE is R4, and the radius of arc EF is R5. The circular arcs and oblique lines are tangent to the straightening roller generatrix and connected smoothly, wherein: the radius of each circular arc is: R1~R4=(X1~X4)×dmin×π×tgαmax; R5=(20~50) mm; the horizontal projection length corresponding to the radius of each segment of the arc and the oblique line is: L1~L5=(Y1~Y5)×dmin×π×tgαmax. The concave roll shape is easy to process and manufacture, can significantly improve product straightening quality and work efficiency, and can significantly reduce tailing phenomenon at the same time. The invention is particularly suitable for the straightening processing of large-diameter pipes / rods with a diameter of Φ100-200mm.

Description

technical field [0001] The invention relates to the technical field of metallurgical machinery, in particular to a concave roll of a large-diameter (Φ100-200mm) pipe / 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, transmission mode a...

Claims

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Application Information

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Patent Type & Authority Patents(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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