SU1357448A1 - Method of manufacturing reinforced articles - Google Patents

Abstract

The invention relates to the field of powder metallurgy, in particular, to methods for producing reinforced products. The purpose of this invention is to provide products of a complex profile, preferably gears. Production of reinforced products is carried out by installing an armature prepared from winding a wire onto a cylindrical mandrel with a circumference equal to the surface scan of the product, deforming the turns of the spirals in accordance with the profile of the resulting product, and further filling the matrix cavity with powder batch joint cold pressing of reinforcement and powder mixture and sintering. The service life of the gears of the oil pumping machine (index MM905, MN907) obtained by this method was 12 thousand hours. 1 tab. 1 il. with S (L SAE sd 4 00

Description

The invention relates to powder metallurgy, in particular, to methods for producing reinforced articles of complex configuration from metal powders, and can be used in various fields of engineering, including the tractor and agricultural engineering industry.

The purpose of the invention is to provide products of a complex profile.

The drawing shows the installation that implements the proposed method.

The reinforcement is made in the form of a spiral of continuous wire by winding it onto a cylindrical mandrel with a circumference equal to the length of the surface of the part and deformation of the turns of the workpieces in accordance with the profile of the reinforced surface. Then the reinforcement is installed into the mold die with its orientation along the profile of the die, the powder is filled and pressed together with the reinforcement, as a result of which the coils are pressed against each other. The pressed preform is sintered.

PRI and, mer. The gears of the oil pump are made (indices MH905, MN907, module 5). The number of teeth 8, height 50 mm.

To obtain spring reinforcement, alloy steel spring wire is hardened to a hardness of HRC 45-49, having a strength of 6 a and 205-230 kgf / mm. Wire diameter 2 mm. A spring with a diameter of 60 mm and a pitch of 5 mm is wound on the automatic machine. The winding of springs A-523. The machine divides the spring into piece workpieces and makes the ends are pressed.

The manufactured spring is heated to 780 ° C and deformed radially in accordance with the gear profile on the experimental setup (drawing) The installation matrix is a gear with a profile that is offset to the center by the thickness of the wire compared to the gear made. Punches moving in the radial direction have the shape of a cavity between the teeth and at the end of the stroke, they close to form the profile of the part to be made.

The reinforcement produced in this way is installed into the die matrix with its orientation along the die profile. Cold pressing

water in the HPM 200 press. Powder charge is loaded into the die cavity automatically by means of a carriage with a hose through which powder is fed. At the moment of loading, the carriage is raised and set over the die hole, making oscillations during this. After backfilling, the carriage leaves the upper punch area. As the powder material is used the mixture of the following composition, wt.%: Graphite1

Copper3

Iron Else The sintering of the billet is carried out at 1150 ° C in the protective atmosphere of dissociated ammonia. Produced test parts.

The test results of the samples are presented in the table.

Stretching

eg KGS / MM

Flexural Strength

 extra

kg

/ mm

35.0

185.0

0

five

Shock viscosity as well

KG SM / SM

Contact strength, compression,

D, kgf / mm with

Work life, h

Porosity,%

4.07

450.0

12 thous. 13-14

During life tests, the gears operate up to the maximum allowable amount of wear on the lateral surface of the 5 teeth (0.2 mm). In addition, the gears made by the proposed method are not damaged due to the breakage of the teeth.

3

Upon contact of friction with another part, the reinforced part is only rubbed by fittings made of high wear resistance wire. This wire, well welded to the powder mass of the part, creates a skeleton with a significant degree of resistance, which prevents bending loads.

In the finished part, the reinforcement is placed exactly on an arbitrarily complex surface. By a known method, placing the reinforcement on a complex surface is impossible.

Thus, the possibility of obtaining reinforced cylindrical parts having a complex configuration of a loaded surface allows the invention to be used in various fields of engineering, in particular

five

574A8 .4

for gears in the tractor industry.

Claims (1)

Claims The method of obtaining reinforced products, including the manufacture of reinforcement in the form of a spiral by winding a wire on a cylindrical mandrel, installing the reinforcement in a mold mold 10 with orientation along the profile of the matrix, filling the powder into the matrix with reinforcement and subsequent pressing and sintering, characterized in that in order to ensure the possibility of obtaining products of a complex profile, the wire is wound on a cylindrical mandrel with a circumference of turns of the spiral equal to the length of the surface sweep from 2Q are divided, and the fabricated helix is radially deformed before being inserted into the mold of the mold in accordance with the profile of the product obtained. Editor N.Rogulich Compiled by E. Khromushina Tehred I. Popovich Order 5971/24 Circulation 605 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design, f Proofreader G. Reshetnik