SU959935A1 - Working tool to die for cutting tubes - Google Patents

Abstract

1.WEARING TOOL FOR STAMP FOR CUTTING PIPES containing shaped knives with an annular cutting edge made in the form of a wedge and forming the inner profile of the pipe when closing the ends of the knives, and a mandrel, characterized in that, in order to improve the quality of the pipes being cut, the ends of the shaped knives made also in the form of a wedge, which points to the line of the knives. 2. Work tool according to claim 1, characterized by Tei, that in the intersection zone of the annular and end cutting edges / of each knife, the cutting edge is angled. (L with with JV CO with Sde JV Put. I

Description

The invention relates to the field of metal forming, in particular, for cutting pipes in the shops of metallurgical and machine-building plants.

Known working tool n stamp for cutting pipes, containing shaped knives with an annular cutting edge, made in the form of a wedge, forming at the closing of the ends of the knives the inner profile of the pipe, and the mandrel 11}.

In a known tool, the cutting edge is formed by the intersection of two planes that, in cross section, have the form of an isosceles triangle with a cutting edge at the apex, and when cutting, there are sagging on the outer diameter, the cause of which is that the cutting edge of the cutting edge to the pipe axis t . The plunging of the pipe at the end occurs with a plane, which reduces the quality of the pipes being cut.

The purpose of the invention is to improve the quality of the pipes being cut.

The goal is achieved by the fact that in a WTciMny working tool for cutting pipes containing shaped knives with an annular cutting edge made in the form of a wedge and forming the inner profile of the pipe when the ends of the knives are closed, and the mandrel, the ends of the shaped knives are also made in the form of a wedge facing the cutting line of the knives. In the intersection zone of the annular and butt-footed cutting edges of each knife, the cutting edge is rounded.

FIG. 1 - the working tool of the stamp is shown; in fig. 2 - the same, side view / in FIG. 3 - a knife; in fig. 4 shows section A-A in FIG. 3

The working tool consists of a mandrel 1, placed inside a raereseg-south profile 2, knives 3, placed diagonally relative to the profile. Each of the knives is made in the form of a rectangular plate, in the middle of one of the sides perpendicular to the thickness of the plate, equal to the thickness of the knife, a through ring groove is made, the center of the groove radius is located on the side of the plate. The radius of the groove is half the internal diameter of the pipe being cut. The perimeter of the groove is sharpened. The sharpening has the shape of a wedge, cutting edges 4, and 5 of which are scanned

isosceles triangles form. When crossing, the cutting edges 4 and 5 of the groove form the inner cutting edge 6. Similarly, the cutting edges 7 and 8, which lie on both sides of the groove along the entire length of the plate end, form the outer straight-edge cutting edges 9. The intersection zone of the inner and outer cutting edges edges rounded off. . .

The tool tool stamp for cutting pipes works as follows.

During cutting, the knives 3 placed diametrically move towards each other. The knives begin to penetrate into the pipe 2 of the outer cutting edge with the gradual introduction of internal cutting edges. Plastic insertion of the wedge tool into the pipe body occurs. When the inner and outer cutting blades of the knives come into contact with the pipe, and taking into account that the cutting of the pipe takes place on a mandrel 1 placed inside the pipe 2, high tensile stresses are created at the cutting head, which cause the occurrence of cracks with subsequent destruction, the knives with the mandrel are not in contact. At the ends of the cutting pipes there is a section of plastic incrustation of the knives, with chamfer marks, and a brittle fracture section, which has a frosted cleavage surface. .

The working tool of the punch for cutting pipes eliminates the blockage of the ends of the pipes being cut, thereby improving their quality and simplifying further technological processing of the pipes, and allows expanding the field of application using cutting tools for cutting non-circular pipes. The use of such a tool simplifies the design of the device for cutting pipes, and gives advantages when cutting the pipe with high-strength steels, due to better ends of the cut pipes, since in this case the fraction of plastic deformation is reduced.

The expected economic effect from the introduction of cutting tools in the cold-rolling pipe workshop will be 12,000 rubles, compared with the base object, which is the prototype. PWC.S

Pic.2 AA

Claims (2)

1. A WORKING TOOL FOR A PIPE CUTTING STAMP, containing shaped knives with an annular cutting edge made in the shape of a wedge and forming an internal pipe profile when closing the ends of the knives, and a mandrel, characterized in that, in order to improve the quality of the pipes being cut, the ends of the shaped knives also made in the form of a wedge, pointed with a point to the cutting line of the knives. 2. Work tool on π. 1, characterized in that in the zone of intersection of the annular 'and end cutting faces of each knife, the cutting edge is rounded.' C with CO with sl> Fig. 1