RU1804358C - Method for manufacturing parts - Google Patents

Abstract

Usage: refers to the field of metal forming and can be used in mechanical engineering and in the production of consumer goods. SUMMARY OF THE INVENTION: one workpiece is deformed by first bending it 180 °; followed by stretching by stretching the bending zone and calibrating the part. The drawing is carried out by the pressure of a fluid with end pressure applied by force from the bent portion. A product with two cavities is obtained. 4 ill.

Description

The invention relates to the field of metal forming and can be used in mechanical engineering and in the production of consumer goods, in particular in the manufacture of kitchen sinks (sinks) with two bowls.

The purpose of the invention is to expand the technological capabilities of the method by ensuring the manufacture of two-cavity products.

For this, in the known method of manufacturing parts by bending, drawing with end support and straightening the bent section with calibration, bending is performed by 180 °, drawing is carried out by liquid pressure, and end support is applied in the bending zone.

Comparative analysis with the prototype shows that the claimed method is characterized in that one workpiece is deformed by first bending it by 180 ° followed by stretching by bending the bending zone and calibrating the part, while the drawing is carried out with the end support of the flange using the applied force from the bent section.

Figure 1 shows a bent workpiece with a gap between the inner surfaces; figure 2 - the initial position of the workpiece 1 with the installed plate-clamp 2, clamped by the matrices 3 and 4, and with a warehouse-holder 5, rigidly connected with the plate-clamp 2. The rigid connection provides a gap in between the folding holder and the workpiece, equal 10-20% of the thickness of the workpiece. Figure 2 is an embodiment for deformation by an electrohydropulse method. A hole D is made in the pressure plate 2, which plays the role of a discharge chamber into which the electrode 6 is inserted. Water is supplied to the discharge chamber through the opening 7.

Fig. 3 shows the position of the pressure plate and the shape of the part at the end of deformation; Fig. 4 is a detail after spreading a bending zone and calibrating a mold.

The method is carried out as follows.

The flat blank 1, the dimensions of which correspond to the dimensions for stamping with two cavities, is approximately twice as long as the blank for stamping parts with one cavity, is bent

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they are 180 ° in the middle of the length, leaving a gap between the surfaces h (see Fig. 1), approximately equal to the width of the edge a (see Fig. 4) between the cavities of the finished part. Then, a clamping plate 2 is installed in the gap, a fold holder 5 is attached to the clamping plate, and the resulting package is clamped between two dies 3 and 4 (Fig. 2) with the possibility of movement, for example, with a force equal to the clamping force of the workpiece flange when In this case, severely limiting the possible disclosure of equipment, the expansion of the matrices within 0.2 of the workpiece thickness. Then, liquid is introduced into the cavity of the pressure plate through the hole, creating sufficient pressure in it to deform the workpieces. Pressure can be generated by pulsed methods, for example by using the electro-hydraulic effect or by the static method, by pumping fluid from a pump. When deformed by hydraulic equipment to prevent fluid leakage between the surfaces of the clamp plate and the workpiece, grooves for sealing elements in the form of rubber or polyurethane cords are made in the plate structure.

With the creation of pressure, the workpiece is deformed, being pulled out from under the pressure flange of the matrix into its cavity. At the same time, being pulled out from under the flange from the side of the curved part, the workpiece does not move the clamp plate and moves it, overcoming friction between the clamp plate and the sections of the workpiece moving in the opposite and perpendicular directions. The workpiece, pulled out from under the clamping flange of the matrix, moves from the bend radius side together with the clamp plate, on the opposite side - towards the movement of the clamp plate, and from the perpendicular sides - perpendicular to the direction of movement of the clamp plate. The force P applied to the pleat during the deformation reduces the tensile load on the workpiece and thereby reduces the required pressure for deformation and thinning and further increases the technological capabilities,

After the deformation into two dies is completed, the obtained part is removed from the tool, the bending zone is straightened, thus aligning the flange, and then the shape of the part is calibrated in a special tool for calibration

An example of the method. For the manufacture of a double sink with cavity dimensions in the plan of 300x400 mm, depth 150

mm, with a rib width between the bowls 32 mm and a flange width of 90 mm, a workpiece with a width of 720 mm and a length of 1200 mm is taken, the workpiece is bent in the middle of the length with a radius of 16 mm. A clamp plate is installed in a bent workpiece, a fold holder is fixed on the clamp plate, a workpiece with a clamp plate and a fold holder is clamped between two dies with a force of the order of 200 tons. Water is supplied into the cavity formed by the hole in the clamp plate and between the electrodes introduced a series of discharges are made into this opening, thereby creating a deforming pressure by means of an electro-hydraulic effect. In this case, a force of the order of 5-20 tons is applied to the fold holder, the value of which is selected experimentally. After carrying out the required experimental number of discharges, the obtained part is removed from the matrices and unbent along the rib between the cavities. Then install in the calibration stamp and calibrate the flange and, if necessary, the shape of the cavities.

The advantage of the method is the expansion of technological capabilities, because it allows stamping of parts with two cavities, while preserving the softened drawing coefficients, approximately equal to the drawing coefficients of a part with one cavity, because metal is supplied into the cavity of the matrixes from all sides by drawing out from under the pressure flanges of the matrixes.

Using this method will make it possible to produce whole-stamped products with two cavities, for example, double sinks without welds, which reduces their complexity, because it is not only required to weld, but also to clean the seams and polish them. In addition, metal consumption will be reduced, as it eliminates the loss of trimming allowances when preparing the edges for welding.

Claims (1)

The claims A method of manufacturing parts by bending, drawing with end support and straightening a bent section with calibration, characterized in that, in order to expand technological capabilities by providing the manufacture of two-cavity products, bending is carried out by 180 °, the drawing is carried out by liquid pressure, and end support is applied in the bending zone. Fig.Z and