RU2155113C2 - Apparatus for making hollow articles - Google Patents

Abstract

FIELD: plastic metal working, namely, drawing of sheet blanks with use of elastic punch. SUBSTANCE: apparatus includes die for placing sheet blank, inner and outer holders arranged concentrically one relative to another in such a way that their ends form gap relative to sheet blank. Elastic inner and outer punches separated by partition are arranged in annular cavities between holders. Pressure punches are placed from upwards onto elastic punches. In inner cavity of die there is elastic rest. Elastic punches are made of pellets whose value corresponds to gap between blank and ends of holders. Pellets are mixed with lubricating powder. EFFECT: enhanced wear resistance of elastic punches, improved stability of process at operation of apparatus. 1 dwg

Description

 The invention relates to the field of metal forming and relates to the drawing of sheet blanks with an elastic punch.

 Known stamp for drawing sheet blanks (USSR author's certificate N 771986, B 21 D 22/10, publ. 30.01.82, bull. N 44), containing an elastic punch and a rigid clamp and matrix, and the elastic punch is shaped and has side matrix section of a smaller section with a height corresponding to the height of the semi-finished product obtained in the first stage of drawing, and with a profile corresponding to the profile of the upper part of the working cavity of the matrix at a site of the same height.

 The disadvantage of this stamp is the difficulty of extracting parts with straight walls and the rapid wear of a monolithic elastic punch due to the occurrence of large friction between the elastic punch and the walls of the clip.

 Also known is a device for the manufacture of hollow products (USSR author's certificate N 615996, B 21 D 22/20, publ. 25.07.78, bull. N 27), containing a matrix, concentric located one to another, the inner and outer clamps installed with a gap between the workpiece and the ends of the clamps, in the annular cavity of which are placed elastic inner and outer punches, separated by a partition.

 The disadvantage of this device is the rapid wear of a monolithic elastic punch due to the use for deep drawing great effort.

 The aim of the invention is to increase the wear resistance of elastic punches and process stability.

 To achieve this goal, the device for the manufacture of hollow products contains a matrix concentrically arranged one to another of the inner and outer clamps, installed with a gap between the workpiece and the ends of the clamps, in the annular cavity of which are placed elastic inner and outer punches separated by a partition, in contrast to the prototype, the device is equipped with elastic support installed in the inner cavity of the matrix, and elastic punches made in the form of granules, the value of which corresponds to the gap between the workpieces oh and ends of the clamps mixed with lubricating powder.

 The invention is illustrated by the drawing, which shows a General view of the device for the manufacture of hollow products: on the left - the starting position: on the right - the final moment.

 The device comprises a matrix 1 on which a sheet blank 2 is placed, inner 3 and outer 4 clamps concentrically arranged one to another, and their ends with the sheet blank form a gap. In the annular cavities between the clamps are placed elastic inner 5 and outer 6 punches, separated by a partition 7. On top of the elastic punches 5 and 6 are installed pressure punches 8 and 9, and in the inner cavity of the matrix 1 is an elastic support 10. In addition, the elastic punches are made in in the form of granules, the value of which corresponds to the gap between the workpiece and the ends of the clamps mixed with a lubricating powder.

 The device operates as follows. The blank 2 is laid on the matrix 1, after which the inner 3 and outer 4 clamps are set concentrically one to another so that their ends form a gap of a certain size with the blank. In the annular cavity between the clamps are placed elastic punches 5 and 6, made in the form of granules, the value of which corresponds to the gap between the workpiece and the ends of the clamps and mixed with a lubricating powder. On top of the elastic punches 5 and 6, set the pressure punches 8 and 9. For the stability of the process from the side of the matrix 1 install an elastic support 10, which balances the process of deformation of the sheet stock and makes it even more stable. When pressure is applied from above to the elastic punches 5 and 6 by pressing punches 8 and 9, the inner punch 5 is extruded into the gap between the clamp 3 and the blank 2. After the entire cavity is filled between the clamp 3 and the blank 2, the drawing process begins. At the same time, under pressure, the outer punch 6 is extruded into the gap between the workpiece 2 and the outer clamp 4. The use of elastic punches made in the form of granules, the size of which corresponds to the gap between the workpiece and the ends of the clamps mixed with lubricating powder, reduces the deformation force and increases the wear resistance of the elastic punches , and the use of elastic backwater increases the stability of the process.

 The proposed device was tested in the manufacture of hollow articles from material AMTSM 1 mm thick. Used elastic punches made of granular polyurethane brand VITUR-T-8. 433-85 according to TU-6-05-221-889-86, mixed with a lubricating powder - molybdenum diosulfite.

Claims (1)

 A device for the manufacture of hollow articles, containing a matrix, inner and outer clamps concentrically arranged one to another, installed with a gap between the workpiece and the ends of the clamps, in the annular cavity of which elastic inner and outer punches are separated by a partition, characterized in that the device is equipped with an elastic support, installed in the inner cavity of the matrix, and the elastic punches are made in the form of granules, the value of which corresponds to the gap between the workpiece and the ends of the clamps, with lubricating powder.