SU1690929A1 - Tooling for taper rolling of twin stepped shafts - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in mechanical engineering in the production of parts with a collar of the type of valves of an internal combustion engine by the method of transverse wedge rolling. The purpose of the invention is to improve the quality of products by preventing the end faces of the collar in the axial direction. The tool for cross-wedge rolling of twin stepped shafts contains plates 1 and elements placed on it for pre-rolling of the lintel (EPRP) 4 seconds.

Description

a rectangular cross-sectional profile, a shaping wedge (FC) 2 with a height of no more than the height of the EPRP 4 and final cut-off knives (NOR) 5 having blades with a triangular cross-sectional profile. The blade width at the base 2 is less than the width AND of the EPRP 4. The grooves 3 for placing shoulders made along the EPRP 4 in the FC2 zone have a width of LM smaller than the width of the bz of the grooves 6 made along the NOR 5. As a result of rolling the EPRP 4 are embedded in the workpiece and roll out the annular groove. Then FC 2 molded piles and the remaining stages of the workpiece. Next, the HOP 5 is divided into a cylindrical jumper between the parts. This tool prevents the end faces of the collar from being axially crushed with the knives of the final separation by avoiding contact of the tool in the zone of the jumper with the ends of the collar. 5 sludge.

The invention relates to the processing of metals by pressure and can be used in mechanical engineering in the manufacture of parts with collet-type valves for an internal combustion engine by the method of transverse wedge rolling.

The aim of the invention is to improve the quality of the products by preventing the end faces of the collar in the axial direction.

FIG. 1 shows the tool LL of cross wedge rolling of twin stepped shafts, mainly with a narrow shoulder, plan; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one; in fig. 5 is a cross-section of the FIG. one.

The tool consists of a plate 1 on which a shaping wedge 2 with height hi, grooves 3 of width bi located in the wedge area, elements 4 for preliminary rolling of the web, each of which is made with a rectangular cross-section profile of height P2 and width I installed on the plate 1 in front of the forming wedge 2, and the knife 5 of the final separation, mounted on the plate 1 behind the forming wedge 2, having a triangular profile blade, whose apex is located along the plane of symmetry of the tool width At the base of the la, a smaller width and rectangular wedge element 4. On both sides of the knife 5 of the final separation, grooves b are made with width D2 greater than the width bi of grooves 3 made along elements 4 for preliminary rolling of the lintel. In addition, reference number 7 denotes a blank, and reference number 8 denotes a cylindrical web.

Cross wedge rolling tool for twin stepped shafts

mainly with a narrow shoulder works as follows.

Heated to the rolling temperature, the dimensional billet 7 is placed between the wedge tools mounted on the plates 1. The plates 1 with the tools are reciprocated, resulting in elements 4 for preliminary separation of the jumper with

rectangular profile with height h2 and width And embedded in the workpiece 7 and roll out the annular groove of the rectangular profile, leaving a cylindrical bar 8 between the shoulders for the final

its separation, then with the help of forming wedges 2 of height hi and grooves 3 of width bi form the shoulders and the remaining steps-billets to the specified dimensions. With further movement

The tool plates 1 with the process of the final separation of the shoulders is reduced to the separation of the formed cylindrical bridge 8 between the ends of the shoulders with the knife 5 of the final separation installed behind the shaping wedge 2 with a triangular profile blade that has a sharp top and a width of base 12 that is smaller than the width of the ring groove

There is no rectangular profile between the shoulders, therefore when inserting the blades into the cylindrical bridge 8, the contact of the edges of the blades with the ends of the sections of the shoulders rolled earlier, is absent, and the tensile forces from the edges of the blades of the triangular profile are compensated by the free elongation of the divided shoulders in the grooves 6, along the knives 5 final separation, having width b2

greater than the width of the bi-grooves 3, made along the elements 4 for pre-rolling lintels, height

The rectangular wedge element is chosen equal to or greater than the height of the forming wedge so that the rolling cylindrical bridge between the shoulders has a diameter not larger than the diameters of the rolled sections of the rod adjacent to. collars to prevent bends from bending when the triangular profile blade is inserted into the lintel body for the reasons indicated. The width of the rectangular wedge for pre-rolling the web should be wider than the triangular profile of the final separation insert to avoid contact of the edges of the blade with the ends of the collar, which can cause curvature of the collar. The width of the grooves of the final separation insert should be wider than the grooves of the forming wedge, taking into account the elongation of the bridge between the shoulders and the edges of the triangular profile, i.e., the width of the grooves compensates for the soybean movement of the parts to be divided.

Thus, the tool for cross-wedge rolling of twin stepped shafts, preferably with a narrow shoulder, improves the quality of the split shoulders by preventing its ends from seeing in the axial direction,

Claims (1)

The invention of the Instrument for the cross-wedge rolling of paired stepped shafts, mainly with a shoulder, containing two parallel plates mounted with 7 the possibility of relative reciprocating movement with shaping wedges located on their working surfaces, elements for preliminary rolling of the lintel, each of which is made in the form of a wedge element with a rectangular cross section profile, with the knives of final separation, characterized in that the quality of the products by preventing the end faces of the collar from being axled, the final separation knives are made with blades forming a triangular pop profile The cross sections, the tops of which are located along the plane of symmetry of the tool, and having a blade width at the base, exceed the width of the element for preliminary rolling of the lintel with a rectangular cross section profile on the working surfaces of the plates along the sides of the elements for preliminary rolling of the jumper the knives of the final separation are grooved to accommodate the shoulders, while the width of the grooves made along the elements for pre-rolling the web, less than the width of the grooves made along the knives of the final separation; elements for preliminary rolling of the lintel are placed in front of the shaping wedges and are made with a height not lower than the height of the said wedges. Aa FIG. 2 6-5 fig.Z Yr FIG. five.