SU1754290A1 - Method of manufacture of internal slots in round billet - Google Patents

Abstract

Use: manufacture of tubular products with internal splines by cold reduction of hollow billets on a spline mandrel. SUBSTANCE: invention uses a tubular billet with alternating projections and depressions longitudinally located on the inner and outer surfaces. Protrusions on the outer surface are located opposite to the depressions on the inner surface. blanks, and the depressions of the outer surface are opposite the projections of the inner surface. when reducing, I place the protruding protrusions in the depressions of the inner surface of the tube blank and the preparation with protrusions and depressions and the outer and inner surfaces are obtained by reducing the initial tube preform with smooth surfaces through the matrix with the protrusions 3 uniformly located in the circumferential direction on the point surface ., When Ly is reduced, the grooves of the slotted mandrel have a projection of the protrusions of the matrix point, 1 ° C. C, f-ly, 10 or "with

Description

The invention relates to the processing of pipes by the method of cold plastic deformation, in particular, to the reduction of the pipe billet on a profiling mandrel, and can be used in the manufacture of slotrs of the type of spline sleeves.

A known method of manufacturing slotted bushings, in which the turned, annealed, billet 1 with a yoyatirovanny surface is installed without a gap on the spline mandrel 2 and together with it reduced through a conical matrix 3 ° when the outer surface is compressed with a given tension, the metal of the billet flows into the splined streams mandrel, which is then removed from the finished part about

Despite the simplicity, this technology has not yet found wide application in production. Experiments carried out at the Institute of Advanced Science of the Ukrainian SSR Academy of Sciences show that it is usually difficult to carry out such a process in one transition in the version described in the book. This is due to the unsatisfactory filling of the mandrel profile with the metal and, consequently, the poor quality of the products obtained. Ll achieve the required fill capacity mex |

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It is necessary to carry out the process of reduction of the mandrel grooves of the mandrel during the formation of deep profiles in several transitions (3-4), and this significantly reduces productivity and increases the cost of the method. These disadvantages make it unsuitable for industrial use.

As shown by the results of a patent search, the discrete effect on the outer surface of the billet during the internal slotting process by the method of cold reduction through the matrix is unknown, as well as the combination of this effect with the previously known continuous effect,

The aim of the invention is to increase by means of a matrix with a circular

cross-section of the working hole with

performance improvement by reducing the number of reduction transitions

This goal is achieved by the fact that in the method of manufacturing internal splines in a tube blank by its cold reduction through a matrix with a conical lead-in portion and a cylindrical calibrating portion of its point on a splined mandrel disposed after pressing, use a tubular blank with profiled outer and internal surfaces with the jerking protrusions and depressions longitudinally disposed on them with the location of the projections on the outer surface between the depressions on the inner surface spine, the splined mandrel before it is placed redu- tsirovani its projections in the depressions the inner surface of the preform trub- hydrochloric ,,

It is possible that a billet with outer and inner profiled surfaces is obtained by reducing the original cylindrical billet with a splined mandrel placed inside it through a matrix, the point profile of which is made with evenly spaced protrusions in the circumferential direction when reducing have opposite projections point matrix. one

The significant difference claimed

The method of reduction from the prototype consists in transitioning from a continuous effect on the crimped workpiece to a local, discrete impact on the metal in the zones of the greatest required deformation. This allows creating optimal conditions for the radial movement of the metal into the slotted grooves of the mandrel. The deformation force at the first transition is spent on volume of the metal, which is low-effective, but only a part of it, which increases the efficiency of the process, reducing its energy intensity.

using a matrix with a round

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Fig. 1 shows schematically a method for producing splines according to the prior art; FIG. 2 is a sectional view of the process shown in FIG. 1 in the minimum cross section of the die hole; in fig. 3.5 shows the first transition of the method of forming the internal splines (obtaining the profile blank according to claim 2); FIG. 4.6 is a sectional view of the process shown in FIG. 3.5 in the minimum section of the working hole of the die; in fig. 7.8 depicts the second transition of the spline formation process; Fig. 9 illustrates the process of removing the splined mandrel from the finished splined sleeve; Fig 10 shows the design diagram of the geometrical parameters of the shaped matrix with deforming protrusions

The inventive method of manufacturing the internal splines in the tube stock is illustrated by the following specific example of its implementation.

On the first transition (yig 3,4,5,6) annealed steel billet with d 23 mm, H 32 mm and L 150 mm, where d, D and L are the inner, outer diameters and the length of the workpiece, respectively, set the gap to profiling spline mandrel 2, made in the form of a splined shaft with splines of the pipe profile, number of splines z 10 On the desktop of the hydraulic press PMM-200, a matrix 3 mounted in the cage is installed. In the cross section, the matrix contains semicircular deforming protrusions inside each cross-section of which The axial section of the matrix has a conical working part, made at an angle of 7 °° The number of projections is equal to the number of splines, and their height is equal to 1.2h, Where h 3.5 mm is the depth of the slots of the spline mandrel and the Formed spline profile Nat g per deforming element the first transition was H

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Claims (2)

Claim 1 о A method of manufacturing internal slots in a pipe billet. By its cold reduction through a matrix 30 with a tapered inlet section and a cylindrical calibrating section of its point on a slotted mandrel located inside the billet, which is removed after pressing, it is not the fact that, with a whole increase in productivity due to a reduction in the number of reduction transitions, a tube billet is used with profile external and internal surfaces, with alternating protrusions and depressions longitudinally arranged on them with aspolozheniem protrusions on the outer surface between the depressions on the inner surface, the slotted mandrel is placed before the pressure reduction and its projections in the 'troughs the inner surface of tube blank, 2, The method of claim _of 1, on t l and h and w u and d with I in that the tubular preform with the outer and inner profiled surfaces prepared 'by reducing the original cylindrical tubular workpiece placed inside the slotted mandrel through the matrix point profile which is made with protrusions evenly spaced in the circumferential direction, wherein the grooves of the spline. corrections during reduction are located opposite the protrusions of the matrix point. '- FIG. 2 v 7754290 fae. 8 175 ^ 290 fig. 9 \. . FIG. 10 Editor A »Feldman Compiled by 0. Rosenberg Tehred M. Morgenthal Corrector N. Gunko Zykaz 2937 Circulation Subscribed VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhgorod, st. Gagarina, 101