A method of manufacturing hollow parts from sheet stock

 

(57) Abstract:

The invention relates to the processing of metals by pressure and can be used in the manufacture of, for example, the casings of the bottoms of aluminum alloys, working under pressure. Produce preliminary stretching sheet, after which it is compressed, canevaluate in a compressed state and thermoablative. Before the final hood on the workpiece causing dimensional grid. During the final drawing on the flange of the workpiece creates additional conditions for braking and controlling the amount of deformation. The result is the enhancement of the mechanical properties of the material and the geometrical accuracy of the received items. 5 Il., table 1.

The invention relates to processes associated with blanking and stamping operations, namely the forming operations, for example, the casings of the bottoms of aluminum alloys, working under pressure.

From technical literature known hood exhaust stamps parts of complex shape (M. N. Gorbunov "Technology blanking and stamping operations in the aircraft manufacturing), engineering, 1970, pages 177-178, Fig. 6.1). When the first operation PL is animal at the end of operation the form of a cylindrical Cup. In the second and subsequent operations of the extrusion billet is cylindrical Cup, which is the result of the operation of forming becomes part of smaller diameter, but greater heights.

The disadvantage of this method is that:

for each operation requires individual stamp;

technological process is constructed in such a way that it cannot be applied in the case of manufacturing complex components is not a closed shape.

Closest to the proposed invention is a Method of manufacturing hollow articles" RF patent N 2007243, MKI B 21 D 22/30, including the definition of the drawing ratio, the calculation of the number of operations, preliminary and final drawing with the clamp.

The disadvantage is that:

- the proposed definition of factor extraction is not possible to control the magnitude of deformation of the material of the workpiece in the process of drawing, which is necessary for alloys capable of perceiving hardening depending on the degree of deformation;

- high complexity and cost of manufacture due to the need to use for each operation individual stamp;

- lack of precision parts, so radiated invention the enhancement of the mechanical properties of the material and the geometrical accuracy of the received items due to the intentional, controlled in the process of extrusion deformation (hard-working) material as stretching and compression.

This object is achieved in that in the method of manufacturing hollow parts from sheet stock, including preliminary and final extraction with clamping flange of the workpiece, after a preliminary extraction produce the compression of the workpiece, senegalian it in a compressed condition and heat treatment, and in the process the final drawing on the flange creates additional conditions for the braking and control the magnitude of deformation of the workpiece, which before the final hood on it are dimensional grid.

In Fig. 1 shows a diagram of a prior operation of the extrusion of Fig. 2 - final operation of the extrusion of Fig. 3 - option of applying dimensional grid on the workpiece before the final extraction, Fig. 4 - a device for samevolume details with special rods, Fig. 5 - a device for samevolume parts during heat treatment.

The proposed method of extraction is carried out in presses for a few operative with corrugated surface, 6 - device for samevolume part 4, consisting of a template of an internal contour part 7, special rods 8, plates screeds 9 and fastening devices 10, 11 - dimensional mesh and the approximate location of its application.

Consider the proposed method on the example of the manufacture of casings bottoms, working under pressure, of aluminium alloys, for example, AMg6 able to improve its mechanical properties depending on the degree of deformation (hard-working). Sheet metal thickness, for example, 5 mm cut out the template (diagrams not shown) of the workpiece 4. During the preliminary drawing the flat blank is placed on the matrix 1, is fixed by the clamp 2 and pushed the descending punch 3 in the cavity of the matrix 1. In this case, the billet is extruded to a depth of H1which is less than the depth H2received during the final drawing. After a preliminary drawing, extending to a depth of H1billet 4 seawolves in a compressed state in a special fixture 6: set the template 7 and item shrinks special rods 8, the flanges are plate-coupler 9 and fixed by the fixing device 10. Then in benevolent state conduct annealing the workpiece, eliminating floor is On the outer surface of the workpiece is applied dimensional mesh, for example 100x100, and to create additional conditions for deceleration during the final drawing on its flange spacer is installed with a knurled surface 5. The workpiece 4 is placed in the matrix 1, is set relative to its center, for uniform stretching of the material on the inner surface is coated with the lubricant, and is the final extract to a depth of H2.

During the final extraction is possible to continuously control the deformation of the workpiece material 4 (hard-working) largest stretch dimensional grid. This value is set in the range (3-10)%, depending on specified in the documentation of the material strengthof 0.2.

In the table given the dependence of improving the mechanical properties of the material from the magnitude of its expansion, the material Amg6m, thickness 5 mm

Tensile workpiece changing dimensional grid with 100 mm to (103-107) mm, the residual elongation of the workpiece material will be (3-7)%. This value can control the change of the mechanical properties of the material: when increasing the rate of stretching is increased ultimate strength and yield strength.

The application of the proposed method of manufacturing hollow parts is t heat treatment of parts in a compressed state after pre-extraction, that eliminates the elastic deformation and the control during the final extraction intentional deformation (hard-working) of the material.

A method of manufacturing hollow parts from sheet stock, including preliminary and final extraction with clamping flange of the workpiece, characterized in that after the preliminary drawing produce the compression of the workpiece, senegalian it in a compressed condition and heat treatment, and in the process the final drawing on the flange creates additional conditions for the braking and control the magnitude of deformation of the workpiece, which before the final hood on it are dimensional grid.

 

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FIELD: plastic working of metals, namely manufacture of piston blanks used in disc brakes of motor vehicles.

SUBSTANCE: method comprises steps of forming blank in multi-position automatic press by multiple drawing without necking of flat blank; shaping concave bottom and outer joining radius of wall and bottom; performing two upsetting operations of blank walls; at second upsetting operation receiving blank with cone lateral walls in die with cone surface. Outer joining radius of wall and bottom is shaped by two transitions. At first transition outer angle between wall and bottom of blank is shaped with use of die having two cone surfaces of different conicity degree, punch and knocking out member with cone portion. Conicity of one surface of die of first transition coincides with conicity of cone surface of die for second upsetting. At second transition outer joining radius of wall and bottom is finally shaped with use of die with cone surface whose conicity coincides with that of die for second upsetting. Then blank is squeezed.

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Production of can // 2557845

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Stretching job us performed including grip of the bowl with sidewall and bed made integral therewith. Note here that said bowl is made of metal sheet. Then, one of circular areas of one wall or both walls is squeezed to make a closed section including a part of or all bed to be deformed within said closed section to increase surface area and to decrease bed thickness. Circular squeezing is intended for limitation or prevention of metal flow from squeezed area into closed section at stretching. Then, bowl stretching is performed to stretch and displace metal from stretched and thinned bed. Drawing is intended for tensioning and displacement of material of stretched and thinned bed to sidewall for make said bowl of lower weight.

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