SU1243853A1 - Method and apparatus for cold rolling of pipes - Google Patents

Abstract

1. A method of cold rolling pipes, including feeding and turning the workpiece for each double stroke of the working stand and deforming the workpiece with several rows of rollers with different rolling out gauges of rollers in rows, characterized in that, in order to improve the process performance and quality of the pipes, each subsequent A series of rollers begins the deformation of the workpiece with a pause after the end of the deformation by the previous series of rollers. 2. A device for cold rolling of tubes, containing several groups of successively arranged supporting strips of equal length with working and idle sections alternating on their profiled surfaces and interacting with strands of strand rollers, characterized in that the planks of the groups are arranged with an offset of 0.25-0 , 70 of their length, the working area of the first bars in the course of rolling corresponds to the idle section as follows: the planks and vice versa, and the length of the idle sections exceeds the working zones by 0.1-0.2 of the length of the planks. i (/) c: epue.f

Description

I

The invention relates to the processing of metals by pressure, in particular to cold periodic. Rolling of pipes mainly on roller mills.

The purpose of the invention is to increase the productivity .. process and quality of pipes "

Example, The method is justified ;: on the mill when rolling pipes along the route 9.6x057-750x0.3 mm. At the beginning of the kak: cycle, the workpiece is rotated51 and moved to the feed rate and then crimped with the first row of rollers. Upon completion of the compression, a further feed of the workpiece is performed and then crimped after the next rollers. Thus, at each time point, the workpiece is crimped by only one row of rollers / and the total feed of the workpiece increases per cycle, which improves the productivity and quality of the pipes. Due to the elimination of surface defects and the reduction of the transverse differential layer when rolling the specified pipe mix, the yield increased from 67 to 74.7%.

Figure 1 presents the proposed device, type; Figure 2 shows the movement of the rollers relative to the workpiece.

The device contains several groups of successively arranged support strips 1 of equal length with working and idle sections alternating on their profiled surfaces and the stream rollers 2 interacting with the plan,

The device p. Works as follows.

Before each deformation cycle, in the extreme positions of the working stand, the workpiece is fed and rotated (discrete scheme), or the supply and rotation is carried out continuously (continuous scheme) Directly during rolling (figure 2), the working stand (not shown) of the reciprocating post - it simultaneously simultaneously moves I and II located in it a number of working rollers j in contact with corresponding infrared supporting strips I of length B, installed with overlap fj, have 1 profiled

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surfaces with workers and single sites and. by the length of a and b. With simultaneous movement of rows I and II, the strain rollers; Rutting the workpiece on the fixed 1 schlind-rheic; which mandrel alternately. At the time of the transfer, the first row of rollers on the working sections of the support plan (the number for the second row of rollers has

10 place idle. After the deformation is completed by the first row of rollers and the workpiece is released, the second row of rollers continues to move along the idle portion of its support bar.

15 pause in the deformation, at the moment of which the additional supply is produced - the workpiece is rotated before it is deformed by the second row of crooks from the moment of contact

2 (5.veni of the second row of rollers with the workpiece and until the completion of the working stroke of the working stand, the rollers of this row deform the workpiece rolling over the working sections of their slats.

 During the reverse course, the process proceeds similarly.

The selected excess of idle working areas, equal to 0.1-0.2 of the length of the slats, guaranteed to provide a pause between the completion of the deformation by one of the rows and the start of deforming with OTHERS, which is minimal enough to effect additional feeding — rotation of the workpiece, which is determined by specific wavas. . The lower value of the specified limits corresponds to the tool mills} {MFR of a larger size XPTR 30-60, KhPTR 60-120), the upper value - Mill I1TP of a smaller size (KhPTR 4-15, KHITR-8-15), The indicated dimensions of the overlap of the support bars 0, 25-0.7 their lengths cover all sizes of serially manufactured KhPTR mills and are selected from the condition of ensuring the minimum:; x dimensions of the parts of the working stand and the distance I; to the working areas of a number of rollers on the workpiece.

The use of the proposed device allows to increase the total for the cycle the supply of the workpiece and, accordingly, the productivity of the process, as well as to improve the accuracy

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geometrical sizes of pipes.

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Claims (2)

METHOD OF COOL ROLLING OF PIPES AND DEVICE FOR ITS IMPLEMENTATION 1. A method of cold rolling of pipes, including feeding-turning the workpiece for each double work tpue.f several rows of rollers with different rolling sizes of rollers in rows, characterized in that, in order to increase the productivity of the process and the quality of the pipes, each subsequent row of rollers begins to deform the workpiece with a pause after the deformation ends with the previous row of rollers. 2. A device for cold rolling pipes, containing several groups of successively arranged support strips of equal length with alternating working and idle sections on their profiled surfaces and the brook rollers interacting with the strips, I distinguish. Furthermore, the strips of the 'groups are located with an offset of 0.25-0.70 of their length, the working area of the first along the rolling strips corresponds to the blank section of the following strips and vice versa, and the length of the blank sections exceeds the working zones by 1 strap .