SU1194606A1 - Method of cutting pipes - Google Patents

Abstract

A PIPE CUTTING METHOD, including cutting a pipe by making an annular groove on the outer surface of its wall, forming an influx and separating the notched part of the pipe by inserting a wedge disk knife into an annular groove of greater width than a circular knife, characterized in that, in order to improve quality the obtained blanks, simultaneously with GF) by applying an annular groove on the outer surface of the pipe wall, concentric with it, the groove on the inner surface of the pipe wall, Lined in the same plane with the first, the annular groove on the outer surface of the pipe wall is made along an arc of a circle with a radius of no more than the width of the groove and a depth of not less than 0.2 of the thickness of the pipe wall, and before inserting the wedge disk knife into the annular groove pipe wall surfaces. 2. Method POP1, characterized in that the groove on the inner surface of the pipe wall is made with a wedge cross section of a depth of 0.05-0.10 of the pipe wall thickness. Od O od sb: U //// F // 77. (Puz.l

Description

The invention relates to the processing of metals by pressure, in particular to methods of cutting pipes, and can be used in mechanical engineering for the separation of pipe material. 5

The aim of the invention is to improve the quality of the resulting blanks.

Figure 1 shows a diagram of the process of separation of pipes, the starting position; figure 2 is the same, the implementation of the ⁰ grooves on the outer and inner surfaces of the pipe; in Fig. 3 the same, in the position of the beginning of the separation of the notched part of the pipe; figure 4 is the same, in the position of the separation 15 of the notched part of the pipe.

The method of cutting pipes is as follows.

Ring grooves are applied concentrically in one plane on the outer and inner 20 surfaces of the wall of the shared pipe 1. For example, by introducing rollers 2 and 3. A ring groove is formed on the outer 25 wall of the pipe along an arc of a circle with a radius of not more than the width of the groove, and the depth of the groove is at least 0.2 pipe wall thickness. A groove on the inner surface of the walls of the pipe junction is made with a wedge-shaped cross-section with a depth of 0.05-0.10 pipe wall thickness. At the same time, it is caught from the annular grooves on the outer and inner surfaces _; a certain amount of metal, which is removed, for example, by rolling the calibrating part of the rollers 2 and 3 (figure 2). The influx of metal can be removed with a cutting tool simultaneously with the shaping of the grooves.

Next, the forming rollers are retracted, and a wedge circular knife 4 is brought to the pipe (Fig. 3). When introducing the knife, the extruded metal first fills the previously obtained groove on the outer wall of the pipe. The shape of the forming groove, outlined in an arc of a circle with a radius of not more than the width of the groove, eliminates the formation of a defect at the end in the form of a clamp between the extruded metal and the wall of the groove. A depth close to 0.2 of the wall thickness of the pipe provides a sufficient volume of the groove to accommodate the extruded metal, as a result of which the influx does not extend beyond the outer surface of the workpiece. At the end of the separation, the metal extruded by the knife into the pipe fills the groove on the inner wall, while the internal influx does not extend beyond the inner surface of the pipe wall.

When introducing a wedge knife 4 to a depth of 0.8-0.9 wall thickness, the pipe is divided.

I fig-z

FIG. 3

FIG. 4

VNIIIPI Order 7356/16

Circulation 1085 Subscription

Branch of PPP Patent,

Uzhhorod, Project 4,

Claims (2)

METHOD OF CUTTING PIPES, including cutting a pipe by making an annular groove on the outer surface of its wall to form an influx and separating the cut part of the pipe by inserting a wedge circular knife into an annular groove whose width is greater than the thickness of the circular knife, characterized in that, in order to improve quality of the obtained blanks, simultaneously with applying an annular groove concentrically to the groove on the inner surface of the pipe wall located on the outer surface of the pipe wall wall, located on the same plane as the first, the annular groove on the outer surface of the pipe wall is performed along a circular arc with a radius of not more than the groove width and a depth of not less than 0.2 of the pipe wall thickness, and before the wedge disk knife is introduced into the annular groove, the influx is removed from the outer surface of the pipe wall . 2. The method of pop. 1, characterized in that the groove on the inner surface of the pipe wall is performed with a wedge cross-section with a depth of 0.05-0.10 pipe wall thickness. Fig .;