SU1581462A1 - Method of producing pistons - Google Patents

Abstract

The invention relates to mechanical engineering technology, and specifically to a method for assembling plastic deformation products or friction welding, and can be used in the manufacture of pistons. The purpose of the invention is to simplify the technology of manufacturing parts and enable its automation. Each workpiece body blank is made in the form of a glass, at the deaf end of which there is a technological installation ledge. The profile of the side surface of this protrusion corresponds to the profile of the inner surface of the wall of the workpiece from the side of the open end of the glass. Several, for example, ten blanks are joined to each other along the ends, inserting the technological ledge of one blank into the cavity of another. Due to the correspondence of the indicated profiles of the contact surfaces of the blanks, they are tightly joined and in the zones of these surfaces are sealed by plastic deformation or friction welding. The result is a prefabricated semi-finished product, which is machined and cut into the bottom sections of glass-like initial billets. Each of the resulting piece blanks of parts is thus hermetically sealed, with the plug being the bottom of the adjacent blank. The last, unobstructed blank, is used in the next batch. Consequently, there is no need to make separate plugs. Prefabricated semi-finished product is convenient to transport and process. As a result, the technology is simplified and the process automation becomes possible. 3 il.

Description

The invention relates to mechanical engineering technology, and specifically to methods of assembling products using plastic deformation or friction welding, and can be used to make hollow hermetically sealed machine parts, such as pistons.

The purpose of the invention is to improve product quality and productivity.

Fig. 1 shows variants of the stack-shaped part body billet;

FIG. 2 shows the stage of assembling a part from blanks with a stepped technological overhang (a) and a cone-shaped technological overhang (b); in Fig „3 - variants of the sealed billet of the part after cutting the precast semi-finished product with a plug of various shapes - cylindrical (a) and conical (b).

The body part blank is made in the form of a glass consisting of a bottom having a supporting zone 1 and a technological installation lug 2, and a tubular part of the wall 3, where zone 4 is a sealing zone located near the open annular end 50 of Blank A is intended for sealing the blank B. The finished part consists of a housing 6 and a plug 7.

The method is carried out as follows.

Stack-shaped blanks A and B are made for the part body. Then, workpiece A is installed with support on the annular end 5 of workpiece B and mutually fixed, i.e. the open and blind ends of adjacent workpieces are joined by inserting a work protrusion of one workpiece into the cavity of the other. Then, plastic deformation or friction welding is performed in the sealing zone 4 contact surfaces of workpieces A and B, which ensures the integrity of the cavity of the part obtained from workpiece B As a result of interconnecting several (for example, ten) workpieces, a prefabricated semi-finished product is obtained, which subjected to further processing, including the operation of dividing (cutting) it into sealed piece blanks of parts consisting of plugs 7 and housings 6. Cutting the precast semi-finished product is made according to these sections of glass-like initial blanks, therefore the plug 7 of blank B is the bottom of the original billet A.

Example 1. A method of half extrusion of extrusion (when the temperature of heating is 700 ° C before extrusion) from 18HGT steel was obtained glass-shaped billets for the body of a part with a total height of 110 mm, an outer diameter of 26 mm of the tubular part, which is 75 mm in depth, 16 in diameter and height , Змм and 7 mm accordingly. The assembly is carried out

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by successive installation of the blanks — one friend to another (the insertion of the technological face protrusion of one blank into the cavity of the other blank from the side of its open end).

Thermopulse crimping of the sealing zone of each workpiece (except for the last one), which is included in the prefabricated semi-finished product, permits sealing of the cavity of each workpiece. After that, the prefabricated semi-finished product from ten blanks is subjected to washing and transferred for final machining to the automatic lathe, where it is also cut into hermetic piece pieces. After machining, the parts are annealed.

The finished part has a height of 106 mm, an outer diameter of 24 mm and a stub thickness of 6 mm,

Example 2. On a lathe of bar rolled steel 38Kh2MYUA produce glasses 112 mm in height, with an outer diameter of 26 mm, depth and cavity diameter of 72 mm and

16.4mm respectively. The installation technological ledge of conical shape on the blind end of the glass has a height of 7 mm and a diameter of -17.0 mm

16.5mm (the largest and smallest). The sealing zones near the open ends of the blanks have a cone-shaped seat, which responds to the technological ledge. The assembly is carried out on a friction welding machine by successively welding a piece stock into the butt of a team. After that, the prefabricated semi-finished product from ten blanks is divided into piece hermetic blanks on an automatic lathe. The last tenth billet (not sealed) after cutting the precast crawl of the product is used in the next batch as the first billet of another precast semi-finished product.

The finished part has a height of 106mm, an outer diameter of 24 mm and a plug thickness of 10 mm.

Due to the fact that the plug 7 of each part is the bottom of the original blank of another part, there is no need to make separate plugs, which simplifies the technology. The implementation of the sequential sealing zones of the joints of several blanks in the precast semi-finished product provides the ability to automate the process

leads to increased production of parts.

Claims (1)

The proposed method makes it possible to obtain sets of parts, for example, an arshnya with identical actual deviations from the nominal dimensions. This allows the pistons to be assembled with guide sleeves and bolsters, and no rubbing of the spherical surface of the piston and the sphere of the syringe, which reduces the labor intensity and duration. preparatory and assembly operations in the manufacture of units of hydraulic machines. The use of an intermediate prefabricated semi-finished product consisting of several piece billets for housings allows the use of live rolls for feeding semi-finished products for mechanical processing, refusing to manually install the blanks into the container for transportation and from the container itself. A method of manufacturing pistons, including receipt of body blanks parts in the form of cups, their subsequent sealing with a plug in the area of an open annular end, characterized in that, in order to improve product quality and productivity, upon receipt of each body workpiece, a central technological protrusion is performed on its blind end, the profile of the side surface of which corresponds to the profile the inner surface of the wall of the workpiece from the side of the open end, before sealing, they knock along the ends of several workpieces among themselves, placing the specified technological s projection in one piece another cavity, sealing is produced by T contact surfaces of adjacent workpieces, and after sealing the resulting assembly is cut on semifinished blank piece sealed parts on bottom portions of the original preforms. K y 2 g 1 FIG. 2 Editor N.Gorvat Compiled by O. Korabelnikov Tehred M. Khodanych Order 2053 Circulation 492 LSCIPI of the State Committee on Inventions and Discoveries at the State Committee on Science and Technology 113035, Moscow, Zh-35, 4/5 Raushsk nab. Fig.d Proofreader M.Sharoshi Subscription