Roll profile with less unevenness of steel pipe internal threads rolled by Assel unit

A roll shape and internal thread technology, applied in the field of roll shape, can solve problems such as affecting users' use and affecting the appearance of steel pipes, and achieve the effect of optimizing shoulder height, improving market competitiveness, and slowly reducing the wall thickness of steel pipes

Pending Publication Date: 2020-08-21
DAYE SPECIAL STEEL CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a roll profile for reducing the inner thread of the steel pipe rolled by the Assel unit, which solves

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  • Roll profile with less unevenness of steel pipe internal threads rolled by Assel unit
  • Roll profile with less unevenness of steel pipe internal threads rolled by Assel unit
  • Roll profile with less unevenness of steel pipe internal threads rolled by Assel unit

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] see figure 1 , image 3 , Figure 4 , Figure 6 , Figure 7 , the invention provides a kind of roll type that alleviates the internal thread of rolling steel pipe of Assel unit, the length of roll is 470mm, and its outer diameter is 500mm, the diameter of its axle hole is 240mm, and the chemical composition (wt%) of its composition has C: 1.65~1.95, Si: 0.4~0.7, Mn: 0.95~1.05, P, S≤0.03, Cr: 1.3~1.8, Ni: 0.8~1.2, Mo: 0.4~0.6, Nb: trace amount, the rest are Fe and unavoidable impurities. From the entrance side to the exit side of the roll, there are successively an entrance cone area L1, a shoulder area L2, a rolling area L3, an exit fillet area L4, and an exit cone area L5, wherein the entrance cone area L1 consists of the...

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Abstract

The invention provides a roll profile with less unevenness of steel pipe internal threads rolled by an Assel unit. From an inlet side to an outlet side of a roll, an inlet cone area, a shoulder area and a rolling area are arranged in sequence. The inlet cone area is composed of a first inlet cone area body and a second inlet area body. The first inlet cone area body is located between the second inlet cone area and an inlet end of the roll. The ratio of the length of the first inlet cone area in the axial direction of the roll to that of the second inlet cone area in the axial direction of theroll is 7 to 10. An inlet taper angle alpha 1 of the first inlet cone area is one degree from an inlet taper angle alpha 2 of the second inlet cone area. The ratio of the length of the rolling area in the axial direction of the roll to that of the second inlet cone area in the axial direction of the roll is 4 to 5. According to the roll profile with less unevenness of the steel pipe internal threads rolled by the Assel unit, the technical problem that because spiral unevenness appears on the internal surface of a steel pipe, user experience is severely influenced.

Description

technical field [0001] The invention belongs to the field of pipe rolling mill equipment, and in particular relates to a roll profile for reducing the inner thread of steel pipe rolled by an Assel unit. Background technique [0002] The internal thread of the steel pipe is an inherent defect in the rolling of the Assel mill. The designed roll shape is different, and the depth of the thread is also different. For example, the roll shape of the original Assel rolling mill ( Figure 5 ) The inner surface thread of the steel pipe rolled out is relatively serious, and the thread depth reaches 0.5mm-0.8mm, sometimes 1.0-1.2mm. First, the spiral concave-convex phenomenon on the inner surface affects the appearance of the steel pipe. It is difficult to pull out, and there is a knife during machining, etc.). Contents of the invention [0003] Aiming at the deficiencies of the prior art, the present invention provides a roll profile for reducing the internal thread of the steel pipe...

Claims

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Application Information

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IPC IPC(8): B21H3/08B21B27/02
CPCB21B27/02B21H3/08
Inventor 曹华李洪亮王朝曦谢帆汪中华
Owner DAYE SPECIAL STEEL CO LTD
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