SU1479196A1 - Method of upsetting thickened parts on rod-like billets - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used for the manufacture of core parts having thickenings both at the end and in the middle part. The purpose of the invention is to improve the quality of the product by providing equal strength of undeformed ends, expanding technological capabilities by ensuring the formation of a thickening in any part of the workpiece along its length and reducing labor intensity. In the place of forming a bulge on the surface of the core blank, holes are made, the axes of which are mutually perpendicular and located in a plane perpendicular to the axis of the rod. The holes form a cavity inside the workpiece. Then the workpiece is placed in the die matrix so that the edges of the hole are located at the level of the mirror of the matrix or slightly below it. The force exerted by the press on the punch causes the thickening to land. The shaping of the bulge is completed before the edges of the holes close. When landing, the metal is redistributed in the volume of the part of the billet that is landed, part of the metal is used to fill the cavity, and some - to form a thickening. The shaping of the bulge in the middle part of the workpiece is carried out similarly, with the placement of the part of the rod located above the cavity, in the punch with the feed hole. The provision of cavities in the preform in the form of through radial openings makes it possible to plant several bulges simultaneously and to improve the manufacturability of the cavity. 1 hp f-ly, 8 ill.

Description

one ,

The invention relates to the processing of metals by pressure and can be used for the manufacture of core parts having thickenings both at the end and in the middle part.

The purpose of the invention is to improve the quality of the product by providing equal strength of undeformed ends, expanding technological capabilities by ensuring the formation of a thickening in any part of the workpiece along its length and reducing labor intensity.

FIG. Figure 1 shows the core blank before planting a bulge in the middle; in fig. 2 is a section A-A in FIG. one; in fig. 3 - detail with a thickening in the middle part; in fig. 4 - the same view

from above; in fig. 5 - the workpiece before planting the bulge at the end of the rod; in fig. 6 is a diagram of the formation of a bulge at the end of the rod; in fig. 7 - detail with a thickening at the end of the rod; in fig. 8 is a view B in FIG. 7

The method is carried out as follows.

In the place of forming a bulge on the side surface 1 of the core blank, holes 2 and 3 are made, the axes of which are mutually perpendicular and located in a plane perpendicular to the axis of the rod. Holes form a cavity inside the workpiece 1. Then the workpiece 1 is placed in the matrix 4 of the stamp so that the edges of the holes 2 and 3 are located at the level

4. 1

WITH

with

OE

mirror matrix or slightly below. By the action of the pressing force on the punch 5, the thickening 6 is disembarked.

The shaping of the bulge 6 is carried out until the majority of the volume of the cavity is filled with metal, t. E. The draft of the workpiece is completed somewhat earlier than the closure of the walls of the holes 2 and 3. During the landing, the metal is redistributed in the volume of the planting part of the workpiece: part of the metal goes to fill the cavity, and part - to thicken.

To prevent the formation of cracks, the inclination of the surface and the tight closure of the metal, a predominantly limited deformation is carried out. The shaping of the bulge in the middle part of the workpiece is carried out similarly with the placement of the part of the rod located above the cavity in the punch with the feed hole.

Example. Making parts with a thickening at the end of the rod. A bar with a diameter of 20 mm made of steel 30 was used as a blank. The length of the blank was 69.5-0.5 mm. In the workpiece pre-drilled two holes with a diameter of 7.0 mm. To eliminate oblique drilling, the axis of the holes was arranged mutually perpendicularly in the same plane. The centers of the holes were 6.0 mm from the end of the workpiece exposed to a deforming force. The billet core part was placed in a matrix with a height of 60 mm. When the workpiece was exposed to the free end, a thickening was set up with restriction of the punch stroke by the limit switches of the press. As a result, a part was obtained with a thickening at the end of the rod, the part length was 64 mm. The dimensions of the thickening are on the core part of the part: height is 4 mm, diameter of the circumscribed circle is 26 mm.

The invention allows for the emergence of a bulge in any part of the rod, regardless of the length of the workpiece, eliminating the need to drill deep holes when arranging the bulges in the middle part of long rod parts, which reduces the labor intensity by about three times, changing the volume of the cavity in the workpiece by drilling holes of different diameters (and in a number of cases due to the implementation of the grooves), which ensures the planting of bulges with different ratios of height and outer diameter, as well as to obtain finished products that have e over the cross section of the core part, located on both 5 sides of the thickening, equal strength. In addition, the presence of unfilled metal through holes in the finished product allows these openings to be used to place the locking means for machine parts - locking wire, spring

0

0

rings, etc.

Claims (2)

Invention Formula 1- Method for planting thickenings on core blanks, including making a cavity in the blank, limited by the formation zone of a thickening, and subsequent slumping of the blank into the end, characterized in that, in order to improve the quality of the product by providing equal strength of undeformed ends, expanding technological capabilities by ensuring the formation of a thickening in any part of the workpiece along its length and reducing labor intensity, the cavity is formed by making through the workpiece through radial holes, the axes of which are located in one plane. 2. A method according to claim 1, characterized in that the draft of the preform is completed before the walls of the holes are closed. BUT L i figure 1 Aa phi.2 fig.Z eri. five fi & .b (rigging b viewb ftsg.8 seg.7