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Method for determining basic rotating speed of roller of ultra-large-diameter sizing and reducing mill

A technology with a super-large diameter and a certain method, which is applied in the field of seamless steel pipe rolling, can solve problems such as the large deviation between the wall thickness of the finished pipe and the calculation, the deviation of the theoretical calculation value, and the failure of the traditional algorithm, so as to reduce the number of repetitions and save time , the effect of improving the calculation accuracy

Active Publication Date: 2020-04-07
太原恒信科达重工成套设备有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method often results in a large deviation between the wall thickness of the finished pipe and the calculated value, which requires a large number of production experiments to correct
Especially in the development of super-large-diameter pipe diameter reduction process, the large internal stress and strain behavior in the large-diameter pipe forming process lead to a large deviation between the actual results and the theoretical calculation value determined by the traditional calculation design method, making the traditional algorithm invalid

Method used

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  • Method for determining basic rotating speed of roller of ultra-large-diameter sizing and reducing mill
  • Method for determining basic rotating speed of roller of ultra-large-diameter sizing and reducing mill
  • Method for determining basic rotating speed of roller of ultra-large-diameter sizing and reducing mill

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Embodiment 1

[0036] Embodiment 1: The method for determining the basic rotational speed of rolls of super-large caliber sizing and reducing mills of the present invention comprises the following steps:

[0037] Formula 1:

[0038] in: are the cross-sectional areas of pipes in Zone I and Zone II, respectively. Since the θ-direction force of the metal in the zone Ⅰ and zone Ⅱ is balanced, the average circumferential stress Satisfies the following formula:

[0039] Formula 2:

[0040] in: are the average wall thickness of pipes in Zone I and Zone II, respectively. Average radial stress of metal in zone Ⅰ and zone Ⅱ mean hoop stress mean axial stress The expressions are:

[0041] Formula 3:

[0042] Formula 4:

[0043] Formula 5:

[0044] Formula 6:

[0045] Formula 7:

[0046] Formula 8:

[0047] In formula 3 to formula 8: kf is the material deformation resistance, R i to attach figure 1 Indicates the radius of the arc BAE, that is, the arc radius of the...

Embodiment 2

[0070] The above method is used to calculate the basic speed of the roll of a φ920 seamless steel pipe sizing and reducing mill unit. The calculation process and results are as follows.

[0071] (1) Calculating the known pass parameters with the number of total racks of the fixed reducing machine m=5, the center distance of the rolls D i =1500mm, entrance speed V 0 =0.3m / s, the outer diameter of the inlet pipe of the first frame d 0 =980mm and wall thickness δ 0 = 50mm (hot state), other parameters such as: hole nominal diameter d i , long semi-minor axis a i , long semi-major axis b i , hole arc radius R i , the eccentric distance e between the hole arc center O' and the hole center O i See Table 1.

[0072] Table 1 Geometric parameter table of pass type of a φ920 seamless steel pipe sizing and reducing machine unit

[0073]

[0074] (2) Substituting the known data of each frame into formula 1 to formula 19 and simultaneously solving the average wall thickness δ of...

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Abstract

The invention provides a method for determining the basic rotating speed of a roller of an ultra-large-diameter sizing and reducing mill. Aiming at given hole pattern geometrical parameters and inletpipe geometrical parameters, the method utilizes a metal axial force balance equation, a circumferential force balance equation, a metal internal average stress equation and the like in a hole patternto simultaneously solve stress and strain states of metal in the hole pattern, and finally determines basic rotating speed values required to be set by each roller. According to the method, the calculation precision of subsequent force energy parameter calculation can be improved, and the repeated times of new process production experiments can be reduced, and basic rotating speed guidance is provided for further controlling the wall thickness distribution of the pipe by adjusting the rotating speed difference of all the racks, and the design and experiment time is saved, and the requirementsof users with higher requirements are met.

Description

technical field [0001] The invention relates to the field of rolling seamless steel pipes, in particular to a method for determining the rotational speed of rolls on each frame of a seamless steel pipe sizing and reducing machine unit. Background technique [0002] The seamless steel pipe sizing and reducing process is the last rolling process of the finished seamless steel pipe. The sizing and reducing machine utilizes the raw pipes with fewer sizes and specifications produced by the pipe rolling mill, so that the pipes will undergo continuous plastic deformation through the multi-stand pass in the pipe to produce a variety of finished pipes with different specifications. The supporting production process design of the sizing and reducing machine includes the design of the rack roll pass, the determination of the roll speed, and the calculation of the rolling force parameters. Among them, the setting of the rotating speed of the stand rolls affects the change of the wall t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/11
CPCG06F17/11Y02P90/30
Inventor 马际青周研薛晓州郝智峰刘伟门晓星邓毅敏
Owner 太原恒信科达重工成套设备有限公司
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