RU1787619C - Method and apparatus for manufacturing parts from tubular sections - Google Patents

Abstract

Use: relates to the field of metal forming. SUBSTANCE: contact pin type parts are obtained from a double billet by simultaneously forming two ring folds from two ends of the billet, followed by crimping the central part of the billet and dividing along the line of transverse symmetry into two symmetrical parts. A device for manufacturing parts from tubular billets comprises two punches mounted to move in the opposite direction, and two multi-position clamping rotary dies made in the form of a pair of gears with internal gearing and mounted with an eccentricity. At the tops of the teeth of the outer and in the hollows between the teeth of the inner wheel there are half-cylindrical grooves which form a cylindrical hole in the fully engaged portion of the wheels. 2 s.p. f-ly, 19 ill. with

Description

The invention relates to the processing of metals by pressure and can be used to form an annular fold on tubular blanks, for example, in the manufacture of parts such as contact pins of fluorescent lamps.

A device for flanging the end of a pipe is known, comprising clamping dies, a forming punch with a conical working surface and drives for moving them.

However, the disadvantages of the device include the fact that when working with pipes of small diameter, the clamping of the pipe with the help of dies or collets is insufficient to withstand the pressure of the forming punch pr.1 to form an annular fold.

A known method of manufacturing parts with a flange from a tubular billet, comprising deforming the billet with a bilateral end draft to form a corrugated convexity in its central zone and dividing the workpiece by the largest convex diameter into two parts, according to which the draft is carried out by clamping its annular sections with ring matrices with inclined working ends, the angle of inclination of which is equal to the angle of inclination of the flange to the axis of the part, and after upsetting, the bulge is flattened by a diameter equal to the diameter of the flange and.

However, this method is intended for pipes of relatively large diameters, because its implementation requires a cylindrical mandrel inserted into the hole of the pipe for its longitudinal stability. In addition, the method provides for the simultaneous formation of only one fold.

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The aim of the invention is to increase productivity in the manufacture of parts such as contact pins.

This is achieved by the fact that, according to a method involving the formation of an annular fold by distributing, followed by folding and splitting into two symmetrical products, annular folds are formed simultaneously at both ends of the workpiece, after which the workpiece is crimped in the central part and divided along the line of transverse symmetry. In a device for manufacturing a part from a tubular billet containing a forming tool and two clamping rotary multi-position dies with half-cylindrical grooves that are installed with the possibility of forming cylindrical holes in the area of mutual contact, the forming tool is made in the form of two punches mounted to move in the opposite direction , the clamping matrix is made in the form of a pair of gears with internal gearing, mounted with an eccentricity, while half-cylindrical Iyo grooves are arranged on the tops of teeth of the external and in the valleys between the teeth of the inner wheel.

Such a constructive solution, in comparison with known analogues, allows to increase productivity due to flanging of a double workpiece, as well as to automate the flanging process.

In FIG. 1 shows a general view of the device; in FIG. 2 is a view A in FIG. 1; in FIG. 3 is a view B in FIG. 1 (ratchet engagement in a working position); in Fig, 4 is the same in the initial position; in FIG. 5 is a view D in FIG. 1; in FIG. 6 is a section DD in FIG. 5; in FIG. 7 is a diagram of the installation of blanks in clamping dies; in FIG. 8 is an engagement diagram of clamping dies and gears; in FIG. 9 - node-1 in FIG. 8; in FIG. 10, 11, 12 - diagram of the operation of the stamping unit; in FIG. 13, 14, 15 illustrate the sequence of operations for stamping annular folds; in FIG. 16, 17, 18, 19, the sequence of manufacture of a part is illustrated.

The device for implementing the method of forming annular folds comprises a base including plates 1,2 with nozzles 3 and an arm 4 mounted on racks 5. Between plates 1, 2, clamping dies b, 7 and gears are mounted 8. Matrices 6, 7 are made in the form of a wheel and its surrounding ring with internal gearing. The matrix 6 and the wheels 8 are mounted on the axles 9, 10, 11, the matrix 7 is provided along the outer generatrix with a ring gear 12, which engages with

gears 8 and is centered by gears arranged circumferentially at an angle of 120 °. In the area of internal engagement between the matrices 6,7, in the depressions between the teeth 13 of the matrix 6 and on the tops of the teeth 14 of the matrix 7 there are semicircular grooves which, when the matrices contact, form cylindrical holes. A cylinder 15 with a piston 16 and a rod 17 and working cavities 18, 19 is fixed on the bracket 4. A beam 20 is fixed on the rod 17 and connected to the rod 21 of the slider 22 installed in the T-slot of the plate 2. The position of the slider 22 relative to the piston 16 is adjustable a nut 23 located in the slot of the traverse 20. On the axis 10 of the wheel 8, rigidly connected to the wheel, a ratchet wheel 24 is fixed, which is installed to interact with ratchet 25 mounted on the slider 22 and pressed into position by the spring 26. In plates 1, 2 from the side of matrices 6, 7 There are arcuate grooves 27, 28 connecting the zone of the nozzle 29, designed to feed blanks into semicircular grooves between the dies 6, 7 with through holes 30. In the nozzles 3 of the plates 1, 2, punches 31 are installed, in the end part of which molding sockets are made 32. The punches 31 are squeezed into the initial position by springs 33. In the nozzles 3 and punches 31 are made longitudinal slots of a rectangular cross section, into which the pushers 34 are mounted, mounted on the crosshead 20. The lateral surfaces 35 of the pushers 34 facing the plates 1, 2 are made to the stem axis 17 p At an angle smaller than the angle of self-braking. The surfaces 35 of the pushers 34 interact with the counter surfaces of the longitudinal slots in the punches 31. The stroke of the piston 16 is regulated by a screw 36.

The method of forming annular folds on tubular blanks using the device is carried out as follows.

The blanks 37 are fed into the opening of the nozzle 29. The feed blank is installed in semicircular grooves between the matrices 6, 7 until the end of the end stops against the wall of the arcuate groove 28 (Fig. 7). The previously filed blank 37 is in the working position and sandwiched between the dies 6, 7 coaxially with the punches 31 (Fig. 10), which are brought into their extreme starting positions. By supplying a working medium under pressure into the cavity 18 of the cylinder 15, the piston 16 moves the pushers 34 and the slider 22 through the rod 17 and the crosshead 20. The pushers 34 act on the reciprocal surfaces 35

the surface of the punches 31, the punches move in the opposite direction and the molding nests 32 of the punches 31 form annular folds 38 at the ends of the workpiece 37 (Fig. 15). By supplying a working medium to the cavity 19, the piston 16 moves the pushers 34 to the initial position, while the springs 33 also remove the punches 31 to the initial position. At the first stage of the movement of the punches 31, the punches are removed from the molded workpiece 37. In the movement of the removal of punches, the ratchet 25 is simultaneously connected to the ratchet wheel 24 and after the punches 31 are completely removed, the ratchet wheel 24 is rotated together with the axle 10 and the wheel 8 by a certain angle . The wheel 8 rotates the matrices 7, b by an angle of one step and the next workpiece 37 is clamped at the working position. During the rotation of the matrices 6, 7, the formed workpieces are moved along the slots 27, 28 to the area of the holes 30. During the movement, the formed workpiece is held on one of the matrices. In the zone of holes 30, the ends of the workpiece abut against the walls of the holes, the workpiece is removed from the matrix and falls out of the hole 30 under its own weight. The device operates in automatic mode.

After the formation of annular folds 38 on the workpiece 37 (Fig. 17), the neck 39 (Fig. 18) is deposited on the workpiece in its middle part and the workpiece is divided along the line of transverse symmetry into two parts 40 (Fig. 19). Throat upset and separation

preforms in two parts are carried out on separate equipment.

Claims (2)

1. A method of manufacturing a part from a tubular billet, including the formation of an annular fold by distributing with subsequent folding and separation into two symmetrical products, characterized in that, in order to increase productivity in the manufacture of parts such as contact pins, ring folds are formed simultaneously with two ends of the workpiece, after which the workpiece is crimped in the central part and separated along the line of transverse symmetry. 2. A device for manufacturing a part from a tubular billet containing a forming tool and two clamping rotary multi-position dies with half-cylindrical grooves installed with the possibility of forming cylindrical holes in the area of complete mutual contact, characterized in that, in order to automate the process, as well as increase productivity by processing a double workpiece, the forming tool is made in the form of two punches installed with the ability to move in the opposite direction, the clamping matrix is made in the form of a pair of gears with internal gearing installed with eccentricity, while the semi-cylindrical grooves are located on the tops of the teeth of the outer and cavities between the teeth of the inner wheel. 8utA I 1787619 29th ± w szs -FG  25 22 Il .. J40 / / I IK // Fie. 2 8t / & 8 Fig.Z // f l-l FIG. 8 W W %% SHShSh J / t t sh sh Fi-). U FIG. tf No. 60