The method of welding pressure

 

(57) Abstract:

The invention relates to welding, in particular to a method of welding pressure, and may find application in the manufacture of shock absorbers in the automotive industry. The inventive piston rod perform with end smaller than the rod diameter; at the end perform a facet. The hole in the lid do the same diameter as the end of the rod that is in it and have. After welding caps, rings and rod, in addition to welding, the melting of the connecting ring and the cover. 1 C.p. f-crystals, 3 ill.

The invention relates to the welding of pressure, in particular, welding methods, for example, the shock absorbers of vehicles, consisting of parts like cover, rod and rings that are welded together.

A known method of welding pressure telescopic shock absorbers, in which a hemispherical cap without hole from one side of the weld ring, the axis of which is perpendicular to the axis of the rod and cap, and on the other side of the rod, weld the end of which is processed on a cone (see Linden, M. and others "Contact projection welding" g, Kiev, Tekhnika, 1971)

However, the welding rod with ring shock absorber through the lid without hole unreliable due to the systematic shock absorbers, which cover do the Central hole, place in it the junction of the ring with the rod and weld (see ed.mon. N 563247, MCI B 23 K 11/02)).

This method is the closest to the invention to the technical essence and the achieved result.

The disadvantage of this method is the instability of the welding process cover with eyelet as possible the gap (bias) between the eye and lid, which is difficult to avoid due to the large area of contact surface and possible defects that occur when the stamping parts with a hole. In addition, a large contact surface area of three parts (caps, lugs and stock) increases the time required for the formation of high-quality welded joints.

The aim of the invention is the intensification of the process of joint plastic deformation in the heating zone, and rigid fastening of the cover on the stock.

To achieve this goal, the Central opening in the hemispherical cover carry diameter less than the diameter of the rod (3mm under a sliding fit), and at the end of the damper rod make the groove depth of 3 mm and a length of not more than 0.5 of the diameter of the rod, allowing svarc the strong connection. For the formation of the closed section of a welded joint projection welding and with the purpose of intensification of the process of joint plastic deformation in the heating zone, at the end of the groove of the rod do the chamfer angle 45ovalue equal to the wall thickness of the stem. After projection welding to improve the fatigue strength of a welded joint, the ring and the cover is additionally connected by the method of fusion welding two joints arranged in a symmetrical planes perpendicular to the plane of the ring and with the length of the seams greater than the outer diameter of the stem at 15-20%

Thus, the groove acts as a stop and lock the lid on the rod during welding. Machined the end of the rod acts as a relief between the rod and the ring.

The proposed method of welding pressure is illustrated by drawings, where Fig. 1 shows the details of the shock absorber, prepared for welding, Fig 2 welded construction, made according to the proposed method, Fig. 3 additional connecting two joints of the ring and cover method of fusion welding. In this case, 1 ring, 2 hemispherical cover, 3-rod with the groove 4 and the chamfer 5, 6 - place the contact projection welding (N 1) piston rod eye (upset metal, clamped by criscuoli fusion.

The damper rod is made from seamless pipe with a diameter of 20 mm with a wall thickness of 4 mm of steel 40, with rotary compression ends of the workpiece, followed by treatment according to the production technology of the piston rod, grinding, heat treatment, polishing and so on). The hole in the lid, stamped from a sheet thickness of 2.5 mm, perform the same diameter as the stem in the region of the grooves, i.e., 20 mm 3 mm 17 mm Hole plays the role of a guide between the cap and the rod. The thus prepared the details of the shock absorber is installed in the fixture for welding and weld in the following mode: welding current 54000 And the compressing force of the electrodes 12000 H, the time of passage of the welding current 16 periods (0,32 s).

As a result of this selection of welding mode and run holes in the lid with a diameter less than the diameter of the shock absorber rod and equal to the diameter of the groove of the rod is melting end of the rod and part of the ring 1, and pocomania cover 2 mounted metal 6 of the stem 3. At the site of contact of the rod with the ring is welded along the circular relief (which is the end of the rod). Upset the metal forms a closed volume (N 1), which ensures the formation of the welded connection is required Sech is to the whole length of the rod when working stroke of the piston, because the lid is not formed thickening. In turn, due to the use of the entire length of the piston (not part of, as in the prototype) increase damping properties of the structure.

In addition, by reducing the contact area of the machined end of the piston rod eye intensifies the welding process and increases productivity.

1. The method of welding pressure mainly automotive shock absorbers, in which a hemispherical cap of the shock absorber performs with a Central hole, on both sides of the hole respectively have the rod and the ring damper and the exercise of their welding, characterized in that the rod end side lid opening for a length equal to not more than half the diameter of the rod, execute diameter less than the diameter of the rod is not more than 3 mm and a chamfer angle of 45°, the hole in the lid do the same diameter as that of the reduced end of the rod, which is placed in this hole.

2. The method according to p. 1, characterized in that after welding the pressure ring and the cover is additionally connected by fusion welding two joints longer than the diameter of rod 15 to 20% are located in symmetrical planes perpendicular to PLO

 

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