RU2087227C1 - Die set for making t-pieces of sheet blanks - Google Patents

Abstract

FIELD: plastic metal working, namely production of pipeline connecting parts such as T-pieces. SUBSTANCE: die set includes shaping die, bending punch-holder, drawing punch and perforating punch mounted in cavity of shaping die. Said die in its upper portion has trough-like shape with radius equal to outer radius of tube portion of T-piece and with lateral walls inclined one relative to another by angle 30-40 degrees. Working end of drawing punch is spherical one with radius equal to inner radius of tube portion of said T-piece. EFFECT: improved design. 5 dwg

Description

 The invention relates to the processing of metals by pressure, and in particular to the production of pipe fittings, in particular tees.

Known stamp for the manufacture of tees from sheet blanks, containing a molding matrix, made completely for the extraction of the pipe and the upper part of the trough-shaped with a radius equal to the outer radius of the pipe part of the tee, and side walls located at an angle of 30.40 ^o relative to each other, bending punch-clamp , an exhaust punch and a punch punch installed in the cavity of the molding matrix.

 The manufacture of a tee in this stamp is as follows. The sheet blank is placed on the mirror of the molding matrix. By moving the punch-clamp down, the workpiece is bent into a trough-like shape, and then moving the exhaust punch down, the pipe of the tee is pulled out while applying the pulsating pressure force of the upper part of the workpiece. The punch punch makes a hole in the nozzle. Then the pipe part of the tee is calibrated with a mandrel and welding of the longitudinal seam is carried out.

 Known stamp allows you to make tees with pipes, the diameters of which can be equal to the diameters of the pipe part of the tees or less.

 However, in the manufacture of tees from low-strength materials (for example, aluminum alloys), the workpiece material ruptures at the interface between the pipe and the pipe part of the tee. This is due to the fact that at the initial moment the exhaust punch draws the workpiece material into the pipe exhaust zone in separate segments located on opposite sides of the symmetry axis of the workpiece. In the zone of these segments and breaks low-strength material.

 The objective of the invention was to prevent rupture of the workpiece material with an exhaust punch at the junction of the pipe with the pipe part of the tee in the manufacture of a tee of their low-strength materials.

The problem is solved in that in the well-known stamp for the manufacture of tees from sheet blanks containing a molding matrix, made completely for drawing the nozzle and the upper part of the trough-shaped with a radius equal to the outer radius of the pipe part of the tee, and side walls located at an angle of 30.40 ^o relative each other, a bending punch-clamp, an exhaust punch and a punch punch installed in the cavity of the molding matrix, according to the invention, the working end face of the exhaust punch is made spherical shape with a radius equal to the inner radius of the pipe part of the tee.

 The implementation of the working end of the exhaust punch of a spherical shape with a radius equal to the inner radius of the pipe part of the tee allows uniform pulling of the workpiece material into the exhaust zone of the nozzle immediately over the entire surface of the working end of the exhaust punch. Therefore, in the manufacture of a tee from low-strength materials, there is no rupture of the material at the junctions of the nozzle with the pipe part of the tee.

In FIG. 1 shows a diagram of the processing of a workpiece in a stamp: to the left of the center line, the moment of completion of bending the workpiece into a trough-like shape, exhaust pipe and punching holes in it for flanging the pipe tee; to the right of the center line, the moment when the pipe flanging is finished;
figure 2 the workpiece after molding the pipe in two projections;
figure 3 diagram of the processing of the workpiece in a combined fixture - welding on the connector after folding the upper half of the tee and calibration on the mandrel;
in Fig. 4, section AA (rotated 90 ^° ) in Fig. 3;
figure 5 finished product in two projections.

 The stamp for the manufacture of tees from sheet blanks contains a molding matrix 1, a bending punch-clamp 2, an exhaust punch 3 and a punching punch 4 mounted in the cavity of the molding matrix 1.

The molding matrix 1 in the upper part has a trough-like shape with a radius equal to the outer radius of the pipe part of the tee, and side walls located at an angle of χ 30.40 ^o relative to each other.

 The working end face of the exhaust punch 3 is made with a radius R equal to the inner radius of the pipe part of the tee.

 In the exhaust punch 3, a through longitudinal hole 5 is made for the exit of the waste after punching the hole in the tee pipe. The exhaust punch 3 simultaneously serves as a punch matrix.

 Coagulation of the upper half of the tee, calibration and automatic welding of the joint are carried out in a universal device (Fig. 3), containing a removable calibration mandrel 6, bending levers 7, pivotally mounted on the bed 8, and rigidly mounted on the bed 8 cradles 9. The bending levers 7 are pivotally connected with rods 10 of power drives (not shown in the drawing). The workpiece is indicated at 11.

 The stamp works as follows.

The rectangular billet 11 is laid on the mirror of the molding matrix 1. By moving the punch-clamp 2 downward, the billet 11 is bent into a trough-shaped shape with its walls at an angle of 30.40 ^o relative to each other, and then the exhaust pipe is pulled downward while pulsating force is applied while applying a pulsating force the pressure of the upper part of the workpiece 11 between the working surfaces of the molding matrix 1 and the punch-clamp 2. Moreover, at the time of removal from the workpiece of the punch-clamp 2 by the amplitude the preform material is pulled into the drawing zone for a certain time by the drawing punch 3 with the formation of corrugations on the upper half of the tee blank released at that moment from the clamp. At the time of pressing the workpiece, the punch-clamp 2 sags the corrugations formed on it before this.

 Such a pulsating clamping of the workpiece lasts from the beginning of the process of drawing the pipe to the end of the formation of the latter.

 Due to the execution of the working end of the exhaust punch 3 with a radius equal to the inner radius of the pipe part of the tee, the workpiece material is pulled into the pipe exhaust zone uniformly, immediately over the entire surface of the working end, which avoids tearing of the workpiece material at the junction of the pipe with the pipe part of the tee when manufacturing the last of low-strength materials.

 After the process of exhausting the pipe with a constant clamping force, punch holes in it using a punch 4 and flanging the pipe holes with the further movement of the exhaust punch 3 down.

The pulsating pressure regime of the workpiece includes such parameters as the amount of pressing force P _tc , the speed of the punch-clamp V mm / s, the speed of the exhaust punch V mm / min, the pulsation frequency of the clamp f beats per minute and the amplitude of movement of the punch-press. The choice of the necessary regime of the pulsating clamp of the workpiece depends on the plasticity of the workpiece material and its thickness.

 The manufacture of a semi-finished tee in a stamp is carried out in one installation and in one working stroke of the press slider.

 Before the final forming of the tee, one of the known methods is trimming the allowance of the trough-shaped semi-finished product to form a longitudinal joint of the upper half of the tee for welding.

 After this, the final forming of the tee and welding of the longitudinal seam in one of the known combined fixtures (Figs. 3, 4) are performed.

 The trough-shaped semi-finished product of the tee is installed in the aforementioned device with the pipe down to the lodges 9, which, with their prismatic working surfaces, provide centering of the pipe. Then, a removable calibration mandrel 6 is mounted on the inner surface of the tube part of the semi-finished product, fixing it in the device.

 By the course of the rods 10 of the power drives with bending levers 7, they coagulate and calibrate the upper half of the pipe part of the tee. Next, a longitudinal joint is automatically welded in a known manner.

 The invention makes it possible to produce tees in the described stamp not only from strong materials, for example steel, but from low strength, for example, from aluminum alloys.

Claims (1)

A stamp for the manufacture of tees from sheet blanks, containing a molding matrix made with a cavity for drawing the nozzle and the upper part of the trough-shaped with a radius equal to the outer radius of the pipe part of the tee, and side walls located at an angle of 30 40 ^o relative to each other, bending punch - the clamp, the exhaust punch and the punch punch located in the cavity of the molding matrix, characterized in that the working end face of the exhaust punch is made spherical in radius equal to the inner radius of the pipe asti tee.

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