SU1310138A1 - Method of soldering parts on curvilinear surfaces - Google Patents

Abstract

The invention relates to soldering, in particular, methods of punching parts along a curved surface, and can be used to restore the worn surfaces of detachable sliding bearing sockets. The aim of the invention is to improve the quality of the solder joint by increasing the density of the solder joint. When soldering parts along curvilinear surfaces, in particular when restoring detachable nests of p-sliding bearings with steel half-rings, a compression force is applied to the connector seam of the steel half-ring at an angle of 50-60 and equal to 1.1-1.15 of the stiffness of the steel half-ring. Under these conditions, a tight fit of the steel half-ring to the solder applied to the bed due to its elastic properties is achieved. The strength of the solder joint is 220-250 MPa, and the hardness of the heat-affected zone is 240-280 units. Nv 2 ill., 1 tab. S (L 00 00

Description

one

Isofetiir (correlates to the soldering area, in particular, to the method of parts but the curved surface, mainly to the method of restoring the worn surfaces of detachable sliding bearing receptacles.

The aim of the invention is to improve the quality of the solder joint by increasing the density of the solder joint.

FIG. a flowchart of the method is shown; 2 (a, b, c) is a pressure distribution circuit.

When soldering parts along curvilinear surfaces, mainly when steel-ring semi-rings replace split sliding bearing bearings, solder is placed between the connected surfaces, the base part is fixed fixed, compression force is applied to the steel semi-ring connector planes at an angle of 1 , 1-1.15 of the stiffness of the steel half-ring, and heated to the brazing temperature.

The method is carried out as follows.

A solder 2 is applied to the cylindrical surface of the restored part 1 (the bed of a detachable bearing seat) and a steel half ring 3 is placed. The assembled unit is installed on the cradle 4, and concentrated forces P applied at an angle relative to the plane of the connector are applied to the steel semi-ring connector planes. The prepared compound is moved under the horseshoe-shaped inductor 5 and the soldering zone is heated.

To ensure a uniform distribution of the pressure of the elastic steel half-ring over the entire surface of the solder, the angle must be in the range of 50-60 ° (Fig. 2a), and the value of P exceeds the rigidity of the semi-ring by 10-15%. Under these conditions, a tight fit of the steel half-ring to the deposited bed is achieved.

solder due to its elastic properties. I

Steel pressure distribution

tapes on the bed detachable bearing seats are presented in the table.

In the event that the load P is applied at an angle greater than 60, in the area of the planes of the connector the component will be normal

five

0

five

P82

scht1 and with and 90 will fall to O (fig.2b). Under 31 of their conditions, a steel semi-circle}, the zo will not firmly press their end parts to the bed and cause a non-solder in the area of the connector of the bearing seat.

When the force is directed at an angle of less than 50, the normal component of the middle section will decrease, which will cause the penetration in the middle part of the socket (Fig. 2B).

To ensure uniform heating of the soldering zone, simultaneous melting of the entire solder, as well as to maintain the base metal structure of the main part, the heating and holding time should be within 25-30 s when using medium solder solders (700-1050 C). If the force P is exceeded, Kt propane appears due to warping of the steel half ring.

The thermal cycle involves heating the soldering zone to melting temperatures of the solder, a metallurgical process of the interaction of solder with heated surfaces, and crystallization of the solder joint.

When melting the solder and spreading it over the surface of the parts being melted, the size of the gap changes and the forces applied to the steel semi-ring change the initial radius of curvature. Outer surface

The 5th half-ring copies the surface of the molten solder, ensuring that the half-ring fits over the entire contact surface of the parts to be joined, making it possible to obtain a continuous weld seam over the entire surface.

To compensate for the change in the gap, the end sections of the half-ring protrude above the plane of the connector of the sub5 hub socket by an amount h corresponding to the change in the length of the weld seam when the molten solder shrinks.

After the termination of heating, the soldering zone is cooled at a rate that ensures the structure and hardness of the material of the part necessary for operation.

Example. The crank of the ZMZ-53 engine with the worn surface of the lower head (steel material D5) was subjected to preliminary machining. Powder solder was placed on the prepared surface.

0

0

313

IIAll-3 (ri-102) mixed with the flux PV-2P1 Tolšiis) 0.3-0.35 mm and steel elastic half-ring 0.8-1.00 mm thick (material steel 45). The assembled assembly was installed on the clamping device support, to the semi-plane of the connector. : The force applied a pressure that created a pressure of 70-80 MPa at an angle of 60 to the bearing seat connector. This amount of force was sufficient to overcome the rigidity of the half-ring and give it a shape that copies the surface applied to the aripo bed. After heating the soldering zone, the melting point of the solder (850-920 C) removes slags and gases from the weld. The thickness of the gap varied from 0.3-0.35 to 0.07-0.08 mm. Such a change in the gap caused the need to choose the angle of application of the load, corresponding to 60 relative to the plane of the connector.

The soldering process was terminated by air cooling with a pressure of 0.3 MPa. At the same time, the adhesion strength of the paired compound was 220

About 5 0

five

384

Claims (1)

250 MPa, the weld area of the heat-affected zone corresponded to 240 to 280 units of HB, and the metal structure was perlite-like sorbitol, which fully corresponded to the initial data of the part according to the technical conditions. The method of soldering parts along curvilinear surfaces, mainly during the restoration of split sliding bearing sockets with steel half rings, n, and where solders are placed between the connected surfaces, the base part is fixed motionless, the compression force is applied to the steel semi-ring connector planes and heated to temperature soldering, characterized in that, in order to noBbmie the quality of the brazing joint by increasing the density of the brazing seam, the compressive force to the plane of the connector of the steel half-ring Adding at an angle of 50-60, a value equal to 1.1-1.15 magnitude stiffness of the steel semiring. a p Editor A.Gulko Compiled by L.Abrosimova Tehred V.Kadar Order 1850/11 Circulation 976 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., A Proofreader M. Pojo