SU985832A1 - Method of manufacturing core - Google Patents

Description

one

The invention relates to the manufacture of a tool used in the insulation of metal cores of cable components.

The cable industry is widely used tools with carbide inserts and inserts from snty & tic diamonds.

Such inserts are carried out, for example, in the drawing paths, and various methods are used for fixing them. In particular, the carbide insert can be fixed by diffusion welding i or brazing with brass 2.

However, fixation with carbide In the mandrel, compared with its fixation in the die, has its own specialty, since in the drag, the drag force presses the insert to the rim of the cone surface of the case, while in the doorway it is insulated to pull the insert out of the case. Moreover, when using a synthetic diamond insert with the current level of technology, neither soldering nor diffusion welding can be used.

The closest to the pre-offer is a turf etching method for applying a polymer coating on a cable product, including installing a wear-resistant insert into a stepped 1shnal of the workpiece, fixing the insert in the channel with a hot deformation of the workpiece using a puaison and the subsequent turning of the outer (L part of the fitting) .

15

In this method, the carbide insert is installed in the housing, preheated to a temperature of 56O-. 600 C (in the case of brass

Claims (3)

20th case) or 8409OOs temperature (when using a steel case) H upset the case with a flat punch. During the precipitation, the metal flows in the direction transverse relative to the axis of the mandrel, as a result of which the strength of the deformed section of the mandrel remaining after turning is turned into a hole in the direction of the axis of the mandrel, which is lower than its strength in the initial state. This disadvantage leads to the destruction of the end part of the mandrel with the separation of the body section in the area of the front insert long before the onset of its wear. The purpose of the invention is to eliminate this drawback. Dp of this use an annular Nu-Adson with an inner conical surface and an outer cylindrical surface compacted with it, whose diameter is chosen less than the outer diameter of the workpiece, the puncheon presses b the workpiece to a depth at which I, Thall in the area of the insert surface flows S radial direction and the diameter of the billet of the workpiece in the deformation zone remains larger than the diameter of the bore inserted. FIG. 1 shows the preparation of the mandrel body; Fig. 2 shows the preparation technology of the mandrel (shown schematically). As in the known method, the workpiece 1 is heated to a temperature of 560-60 ° C (in the case of a brass body) or up to 840-900 C (when using a steel body). A wear-resistant insert 2 is inserted at the easy-press landing in the step channel 3 of the pre-heated body. The deformation is carried out by an annular punch 4 with an inner conical surface 5 and a mating outer shshadrichesky surface 6, the angle of the taper of the surface 6 is recommended within 15-35. In the manufacture of a large partgak of the same mandrels, the angle of the punch is chosen equal to the required angle of taper of up to 1 na. In the manufacture of several mandrels of different taper, the angle of the punch is chosen equal to the angle of the mandrel of the greatest coning. The diameter D of the outer cylindrical surface of the punch; 4 choose. The outer diameter Oji of the workpiece is 1, 1, but 3.5-4 times larger than the diameter i3 of the wear-resistant insert 2. The punch 4 is pressed into the workpiece 1 to a depth V, at which the metal in the surface 7 of the insert 2 flows in a radial the direction and the diameter d 2 of the channel of the workpiece 1 remain larger than the diameter d of the channel of the insert 2. At the same time, the metal of the workpiece flows along the inner forming punch, post amply occupies the space above the insert 2, and the diameter c12 decreases, the resistance to flow of the metal along the forming increases and the metal begins B ech radial direction. The punch is pressed in until the radial flow of the metal is observed directly in the zone 8 of the surface 7 of the insert 2. Further pressing of the punch does not improve the quality of fixing the insert. A radial flow of metal in zone 8 is observed when the punch is immersed to a depth of 0.42D. At the same time, up to the immersion depth of 0.7D, the quality of the fixing does not deteriorate, and the internal diameter of the channel d formed by the defaulted material exceeds, as a rule, the diameter of the internal channel of the insert. The proposed method provides a reliable fixing of the wear-resistant insert during the work of the mandrel before no-wear. The invention The method of manufacturing a mandrel for applying a polymer coating on a cable product, including the installation of a wear-resistant insert into the stepped channel of the workpiece, securing the insert in the channel by means of a hot deformation of the workpiece using a punch and subsequent turning of the outer part of the workpiece to a cone, characterized by In order to increase the reliability of fixing the insert without using solder, a ring punch with an inner conical surface, the diameter of which is chosen to be smaller than the outer diameter, is used. otovki, the punch is pressed into the preform to a depth at which the metal surface in the insertion zone flows in a radial direction of prefecture and the workpiece bore diameter in the deformation zone remains bop- Chez insertion channel diameter. Sources of information taken into account in the examination 1. US Patent No. 215О734, cl. 72-467, published. 1939. 2.Ha to G.S. Tool for drawing, wires. M. Metallurgi, 1974, p.47. 3. Technological documentation of the Epektrokabel plant No. VKr 22810 of the Dorny and the matrix for imposing isosch or sheaths on the wires. Kolchugino, 979. (rig.1 U9.t