SU1038011A1 - Apparatus for moulding sheet parts in superplasticity mode - Google Patents

Abstract

A DEVICE FOR FORMING SHEET DETAILS IN SUPER PLASTICITY MODE containing coaxially installed heated matrix and chamber in communication with the source of supply of working medium, as well as the unit for pressing the workpiece during the forming process, characterized in that, in order to improve the technological possibilities by creating along the forming forming material With variable pressure and temperature fields, the pressing assembly is located in the cavity of the chamber and is made in the form of one amp & amps with one ends in contact with the work piece sially located shells, telescopically interconnected with free ends and having the possibility of axial movement with & locally with the workpiece during its dei formation, while the cavities of the shells are interconnected by means of re (L guileable holes made in the walls of the shells.

Description

The invention relates to the processing of n-metals by pressure and concerns the dies of sheet blanks by means of pressure of the working medium. A device for sheet metal punching pressure liquid working. containing a matrix and a housing with a working fluid, the cavity of which is divided into separate zones | auto-connected but connected via gearboxes by a station and isolated from each other telescopic bounding ends and spring-loaded one another, having the shape of the surface of rotation bodies, the free K of which are fitted with seals and interact with the blank fl. However, this device cannot be used when forming heated billets in a state of extra plasticity, as this would require not only a separate control valve but also a separate heating device in each area of the body, which would greatly complicate the design and lead to an increase in cost. the details. The closest to the proposed technical essence and the achieved result is a device for forming sheet parts in a mode of extra plasticity, containing a coaxially mounted heated matrix and a chamber in communication with the source of supply of the working medium, as well as a unit for pressing the blank during the molding process. The booster assembly is a chamber in communication with the cavity of the matrix, in which the molten salt of 2 J is under controlled pressure. However, taking into account that punching in a superplasticity rosette can occur in narrow temperature ranges, the selection of salts for various materials represents considerable difficulties. In addition, the known device allows creating only two zones with constant temperatures and does not provide for the creation of a temperature field that varies along the generator of the workpiece. All this limits the technological capabilities of the device. The purpose of the invention is to expand the technological capabilities of the device by creating an alternating pressure and temperature along the forming part of the mold. This goal is achieved by the fact that in the device for forming sheet parts in superplasticity mode, containing coaxially mounted heated matrix and chamber in communication with the source of supply of the working medium, as well as the component for pressing the preform in the molding process, the node for pressing is located in the cavity of the chamber and the outlet; coaxially arranged shells, telescopically interconnected with free ends and having the possibility of axial movement together with the workpiece in the process of its deformation, while the cavities of the shells are interconnected by means of adjustable holes drilled in the walls of the shells. The drawing shows the proposed device. The device comprises a rigid matrix 1 and a working chamber 2 associated with a high pressure gas source. In the working chamber 2 are mounted. Heaters 3, which can be used heating elements, spirals or other lime devices. Inside the chamber, there are movable in the vertical direction shells 4, extruded from a material with low thermal conductivity, and rotatable adjusting rings 5 associated with them. In the side walls of the shells and in the rings 5 there is a system of openings with the possibility of their mutual blocking. In the central part of the working chamber there is an outlet nozzle 6 with a right & additional safety valve 7. Instead of the key & a reducer can be used to maintain the gas pressure VO of the inner cavity of chamber 2 at a given level. The device works as follows. The working chamber 2 is installed with the sheet blank and pressed by the matrix 1. Then, the chamber 2 from the high pressure source (cylinders, compressor, etc.) is supplied with gas under the pressure necessary to deform the plug. The gas is heated in working chamber 2 to a predetermined temperature with the help of heaters 3 mounted in the stacks of the chamber. The passage through the system of openings in the side walls of the shells 4 and in the adjusting rings 5, the heated gas due to a sharp expansion at the exit of the nz hole holes and due to heat transfer

cools down and at the same time a drop in gas pressure occurs.

As a result, the pressure and temperature of the gas in the inner cavities of the shells will be lower than outside. Under the action of the pressure of the shell, they will be constantly pressed against the eagchugovka.

If necessary, spring buffers, pneumatic or hydrocyliidry, or other known devices can be used for additional preloads. The temperature pressure threshold is controlled by turning the adjusting rings, the DQIM changes the flow area of the holes, and the gas flows through it. & 1 gas inlet from the working chamber occurs through the outlet nozzle 6 with a safety valve or a reducer installed on it, ensuring that the gas pressure is maintained. the central part of the working chamber 2 at a given level.

The creation of variables in the radial direction of temperature and pressure additionally deforms the peripheral part of the prefabrication, and this leads to an increase in the possibility of shaping and to reduce the difference in part size. The selection of the deformation temperature and the gas pressure allows stamping in superplasticity modes.

The device was stamped when stamping parts from AMG6M L 1.5 with a diameter of 2OO mm. The stamping was carried out at 420 ° C in the extreme KaMepei in the central chamber; the temperature was 5– 370 ° C. Two tons of cylindrical shells of diameter - were used. rum 120 and 7O mm.

The holes in the (Stacks and rings had diameters of 5 mm. The punching was carried out with air at a pressure of 1–15 atm generated by the compressor. The pressure drop was 3-5 atm.

As a result of stamping, parts were obtained with a difference in thickness not exceeding 15%, which is 5-7% less than when stamping by known methods.

 The cost of parts compared to punching in a known manner is reduced by 20-30%. The economic effect in the manufacture of parts with a diameter of 1OOO-2OOO mm is O, O, 7 rubles. on one detail.

Claims (1)

DEVICE FOR FORMING SHEET DETAILS IN SUPERPLASTICITY MODE, containing coaxially mounted heated matrix and a chamber in communication with the source of supply of the working medium, as well as a unit for lounging the workpiece during molding, characterized in that, in order to expand technological capabilities by creating along the forming moldable preforms of an alternating pressure and temperature field, a reinforcing unit is located in the cavity of the chamber and is made in the form of coaxial laid shells, telescopically interconnected by free ends and having the possibility of axial movement together with the workpiece in the process of its deformation, at. this cavity cavities communicated with each other through adjustable holes made in the walls of the shells. 1 1038011