SU535120A1 - Cold tube rolling mill tool - Google Patents

Description

(54) TOOL OF COLD PIPE ROLLING MILL

The invention relates to pipe rolling equipment, in particular, to the tool of a hollow pilgrim mill for rolling pipes. A well-known tool for a cold piligrim rolling mill tube containing reciprocating working rollers with a stream of constant radius and supporting bars interacting with them, having slopes of reduction and reduction in sections of reduction and reduction, which ensures compression of the workpiece in diameter and wall, while the slope of the support surfaces facing the exit of the finished pipe 1. The durability of the radius of the streams on the rollers causes a reduction in the workpiece compression in diameter (not more than 10-15%), and this reduces the performance maneuverability of the rolling mill. The closest in technical essence to the present invention is a tool for a cold piligrim tube rolling mill containing support planks with a flat working surface and a cog roll interacting with them, a reduction section with a reducing radius with a decreasing radius, and a curing with decreasing radius calibration with a constant radius of the stream 2. The disadvantage of the prototype is that the working surfaces of the slats on the crimping section are parallel to the rolling axis, due to and with this, the compression of the preform wall is accomplished by reducing the radius of the brook from the beginning of the compression zone to its end. The mechanical treatment of such a stream is a very complicated operation, and the accuracy of its dimensions and the quality of the surface, which determine these parameters on the pipes, turn out to be worse than that of a stream of constant radius. Performing a variable radius brook for producing pipes with a diameter of less than 10 mm on existing equipment is generally problematic. The aim of the invention is to expand the range of pipes in the direction of reducing their diameter, increasing the accuracy of their geometric dimensions. This is achieved by the fact that the reduction section on each roll is made with a constant radius of a brook, and the length of the support bar is composed of sections for reduction and reduction with the inclination of their working planes towards the entrance of the billet into the rolls and the calibration section parallel to the rental axis. Such an embodiment of the tool makes it possible to produce pipes with a diameter of less than 10 mm with high dimensional accuracy and surface quality.

The drawing shows a working tool, one of the symmetric halves.

The tool contains support strips 1 fixed in a frame 2, equipped with a reciprocating drive (not shown), and working strand rolls in contact with the strips 3. Each roll has a reduction section (/ p) with a variable decreasing radius along the length to crimp the workpiece 4 in diameter, a section of compression (/ o) with a constant radius for crimping the workpiece along the wall and a calibrating area (/ k) with a constant radius for calibrating pipes by diameter.

The working surface of the support bar 1 or plate is also composed of the roll sections of the reduction sections corresponding to the zones of the roll

(/ p), reduction (/ o) and calibration (/ k), the reduction and reduction sections are made with their working surfaces tilted towards the entrance of the workpiece 4 to the rolls, and the calibration section is parallel to the rolling axis. The inclination of the working surfaces of the support bars in the p, feeding and crimping areas has a variable value, which is determined by the known methods for calculating the support bars.

Works tool when rolling as follows.

The rolls 3 make a swinging and reverse rotational movement along the rolling axis to deform the workpiece 4 on the mandrel 5, which can be both conical and cylindrical. In this way, the rolls (pins) of the rolls roll around without sliding on the support bars 1 (or plates), which also reciprocate in synchronization with the rolls, but at a higher speed (the extreme position of the roll and the bar shows the dotted line).

When rolling along the slats at the reduction site (/ p), the swath compresses the workpiece but to the diameter by changing the stream radius. When rolling the rolls on the inclined part of the plank 1 on the region; the needle section

(/ o) the distance from the center to the rolling axis varies, which ensures the wall is compressed by a stream of constant radius. When the rolls roll over the bars 1 in the calibrating area (/ k), the distance from its center to the axis of the rolling ring changes and the pipe is calibrated to the diameter with a stream of constant radius. When moving near the extreme positions, the rollers release the workpiece 4 for feeding and turning.

In the described use of the proposed tool, the rolls are directly supported on the support bars.

Variants are possible in which the rolls with streams rest on the support plates through open rolls or through runners mounted on the roll ends.

Using the proposed tool, during machining the strand, it is possible to carry out its dimensions at the crimping section (at the radius of the stand) with high accuracy and to bring the surface to high quality, and at the stretch with a variable radius these requirements can be significantly lower, and thus get pipes with high quality, to expand the range of pipes, 1B especially in the direction of decreasing the diameter, to improve the performance of the pipe mill.

Claims (2)

1.Shevakin Yu. F., Seidaliev F. S. Mills for cold pipe rolling, ed. "Metallurgists, 1966, p. 86-88. 2. The copyright certificate number 119162, cl. At 21B 21/00, 1958.. Axis rolling