Straightening machine frame pretightening technology

Abstract

The invention discloses a pretightening technique of the machine frame of a straightening machine. The invention is able to effectively solve the residual pretightening influence and improve the straightening accuracy. The specific method is that: 1) the milling roller stressed area of the straightening machine is divided into a front roller area, a central roller area and a back roller area. 2) according to the straightening strength of each milling roller, the invention is able to obtain the working load F1, F2, F3 to Fn which transfer from a roller bearing to an upper beam and the working load F1', F2', F3', to Fn' which transfer from the roller bearing to a lower beam. 3) the upper beam gravity G per N borne by each upright post of the straightening machines is obtained, G is the upper beam gravity, N is the quantity of the upright post. 4) the drag load borne by each upright post is obtained:Fn resultant is equal to Fn and F' n G per N according to the total stressed force of the upright post and the gravity of the upper under working condition. 5) the necessary enforced pretightening force can be calculated according to the formulas in the step 1) to 4). F' is equal to mF, wherein, m is the pretightening coefficient. 6) one value is taken from the m of N upright posts, or taking various values are taken from the m of the N upright posts so as to get various resultant force ratios of the upright posts. Finally the pretightening coefficients of various upright posts are distributed according to the reciprocal value of the resultant force ratio, namely mn is equal to that the value of Fnresultant and 1: Fnresultant multiplies the value of mn minusing one; and at last the value generated from the multiplying operation is added with one.

Description

technical field [0001] The invention relates to a straightening process of a tube and rod straightening machine, in particular to a pre-tightening process of a straightening machine frame. Background technique [0002] At present, the oblique roller straightening method is specially used for straightening the round section bar. The roller and the round bar are obliquely intersected. When the roller rotates, it rotates and advances. The orientation of is changed in a spiral pattern. This is an all-round straightening method. Since the original bending of the round material may exist in any direction, that is, there is a three-dimensional bending, it is especially suitable for the skewed roller straightening method. [0003] Most of the tube and bar straightening machines are multi-column upper and lower beam structures, and the frame is fixed by bolt pre-tightening. The rigidity of the rack is ensured by applying bolt pre-tightening force to each column. The traditional pr...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the current straightening machine cannot overcome the problem that the straightening accuracy is affected by the uneven residual pre-tightening force of the column. Straightening machine frame pre-tightening process

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