The roller machine refers to equipment with a periodic cycle of operation. The pipe is laid on a fixed conical mandrel and rolled with 4 calibers fixed in working rollers. The cross-section of the caliber has a variable radius. The initial value is equal to the radius of the workpiece, and the final value corresponds to the finished product. Thus, the direct movement of the cell narrows the gap radius between the calibrations, compressing the workpiece. The output is a pipe with a specified diameter (D) and a thickness (t). The cycle is repeated in the opposite direction — the cage returns to its initial position, re-crimping the product. As a result, the parameters of the finished pipe, during one cycle, are the product of the total hood for delivery (t).
The most common type of fastening for fixing calibers on a swathing machine is the caliber-half disk. It is fixed in the working cut of the swath. Another type of fastening is that the roller is made in the form of a ring and is mounted on the working shaft-shaft. This type of fastening has appeared recently.
The radius of the work roll affects not only the length of the stroke of the cage, but also the weight of the stand and its number of returns per minute, the mill’s productivity, the degree of deformation of the workpiece and the wall thickness of the pipe being manufactured. From the radius of the work roll depends the angles of roll turn, the parameters of the gears of the initial circle, the length of the connecting rod and the stroke of the cage, as well as the ratio of the length of idle and working sections of the stand.
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