SU1766641A1 - Method for repair of moulded pieces with cracks - Google Patents

Abstract

Use: repair of car body parts. SUMMARY OF THE INVENTION: A number of holes are drilled into the parts on both sides of the crack and along a straight line perpendicular to the crack, the jumpers are removed between them, the crack is filled with self-hardening polymeric material and the shaped inserts with cylindrical pitch are pressed into the grooves formed elements smaller pitch holes in the details of the width of the crack. In this case, longitudinal grooves are made on one end of the sleeves on the outer surface and transverse grooves on the other, the said end is cut longitudinally in two mutually perpendicular planes and the sleeves are installed in the groove holes before pressing the inserts. 4 il.

Description

The invention relates to the repair of machine body parts, in particular, to the repair of cast body parts from light alloy material.

The aim of the invention is the expansion of technological capabilities.

Figure 1 shows the floor sleeve; Fig. 2 shows the fitting insert; on fig.Z - section of the repaired body parts with a crack; FIG. 4 is a section A-A in FIG.

The method of repairing molded parts with cracks is as follows.

In the molded body part 1, the holes 3 are drilled on both sides of the crack 2 and one straight, perpendicular to the crack, the jumpers are removed between them with the formation of grooves, the crack is filled with self-hardening polymer material. hollow bushings 4 of a material whose hardness exceeds the hardness of the material of the repaired part 1, while at one end of the bushing located in the body of the part 1 transverse grooves 5 and four slots 6 diametrically opposite to each other are made longitudinally m end sleeve 4 - longitudinal corrugations 7 and slot 8 at the shrinkage jumper shaped insert. To facilitate insertion of the hollow sleeves 4 into the openings 3, their bottom with slots 6 corrugated parts are bent to the axis of the sleeve, and then heat treated to obtain a hardness exceeding the hardness of the material of the part

The fitting insert inserted into the groove after installation into the holes 3 of the hollow bushings 4, consists of two working cylindrical elements 9 connected by a rectangular jumper plate 10. The pitch of the working cylindrical elements 9 of the shaped insert is chosen less than the pitch of the holes 3 of the groove in the part by width D | cracks 2.

Example. The cylinder block was made of light alloy alloys, having a blind crack with a width of 0.38-0.42 mm with a penetration depth from

(L

WITH

vi o o o o

N

9 to 12 mm. Hole drilling diameter

10 mm on both sides of the crack with an intercenter distance, 4 mm, mm depth, the removal of the jumper between them leads to the formation of a shaped groove for the insert with a jumper equal to 2.8 mm. The crevice and the bottom of the figure groove are filled with self-hardening polymeric material by first degreasing these surfaces with acetone or another solvent. Before the polymer composition is cured, hollow bushings 18 mm high, with an outer diameter of 10 m, with an inner diameter of 6 mm and with a slit 2.8 mm wide and 10 mm deep under the web of the figured tightening insert are pressed into the groove holes. At the end of hollow bushings located in the body of the part, transverse grooves and four longitudinal diametrically opposite slots are made, and at the other end are longitudinal grooves with a height of 3 mm and a width of 1 mm. Figurative shrinkable insert (after installation of hollow sleeves) with intercenter distance between working cylinders mm, their cylinder diameter 6 mm and insert lintel thickness 2.6 mm, bevel angle 5 ° with force pressed into the groove. Under the action of insertion of working cylinders, the transverse grooves of the sleeves penetrate with a slight plastic deformation of the material of the part into the lower part of the holes of the groove and are reliably pressed into the holes, and the liquid polymer material, due to the action of capillary forces, fills all the gaps in the part-sleeve system - a crack. insert, providing the necessary tightness. The engine with the repaired cylinder block was operated in the car during the field season and showed reliable trouble-free operation, Considered economical, simple in technological

performance without welding the repair of cast parts through the use of an additional intermediate sleeve element made of a material with a hardness greater than

The hardness of the material of the component being repaired expands the technological possibilities; this is especially pronounced in the restoration of body parts made of light alloys, where the use of traditional

0 welding methods often leads to marriage. It should also be noted that the slits made at the ends of the intermediate element of the sleeves can reduce the internal stresses in the part-bushing-insert system caused by the difference in thermal expansion coefficients of the materials used at possible temperature jumps under severe operating conditions.

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Claims (1)

The invention of the method of repairing molded parts with cracks, which consists in drilling into the parts on both sides of the crack and one at a time, perpendicular to the crack, holes, removing jumpers between them with the formation of grooves, filling the crack with a self-hardening polymer material and pressing into the grooves figure inserts 0 with the pitch of the working cylindrical elements smaller than the pitch of the holes in the part by the crack width, characterized in that, in order to expand the technological capabilities, before pressing the figure inserts into the holes of the groove, hollow bushings of the material are installed, the hardness of which exceeds the hardness of the part material at one end located in the body of the part, transverse grooves and longitudinal diametrically opposite grooves are made, and at the other end, longitudinal grooves and grooves under the lintel of the figures insert the second. / U ABOUT +. Aa & U2 3 FIG I, .