Hollow part manufacturing method

FIELD: plastic metal working, namely processes of die forging, possibly for manufacturing stepped hollow shafts.

SUBSTANCE: method comprises steps of calibrating blank prepared by chopping; forming in blank upper and lower cavities, bottom portion with cylindrical near-bottom part and local outer bulged zone. Upper cavity is formed at first pressing out stage. At second stage of pressing out lower cavity, bottom portion and local outer bulged zone are formed simultaneously while blank is centered by punch along it upper cavity and in die along cylindrical near-bottom part.

EFFECT: enlarged manufacturing possibilities of method.

6 dwg

 

The invention relates to the processing of metals by pressure, in particular to the technology of die forging, and can be used for the manufacture of a stepped hollow products.

A known method of manufacturing hollow parts, including the formation of the billet upper and lower cavities of the extrusion punch in the matrix, which is carried out in two stages, as well as the formation of a bottom part with a cylindrical bottom part and local outdoor thickening (see A.S. No. 1752479 A1, 13.11.1990, 21 To 21/08).

The disadvantage of this method is that the method does not allow local external thickening in the middle part, which narrows its technological capabilities.

Task to be solved by the claimed invention is directed, is to obtain local outdoor thickening in the middle part that extends the technological possibilities of the method.

For this purpose, the method of manufacturing hollow parts, including the formation of the billet upper and lower cavities of the extrusion punch in the matrix, which is carried out in two stages, as well as the formation of a bottom part with a cylindrical bottom part and local outdoor thickening, carry out the cutting of the workpiece which is subjected to calibration, the formation of the upper cavity is produced in the first stage of extrusion, and the second stage - at the same time, what about the form the lower cavity, the bottom part of the local and external thickening with centering the workpiece by the punch on the top of the cavity and in the matrix of the cylindrical bottom part.

Signs "... the formation of the upper cavity is produced in the first stage of extrusion, and the second stage simultaneously form the lower cavity of the bottom part and the local external thickening with centering the workpiece by the punch on the top of the cavity and in the matrix of the cylindrical bottom part are essential and necessary for local outdoor thickening in the middle part of details.

1 shows a diagram of the 1st calibration;

figure 2 shows the scheme of the 2nd calibration;

figure 3 - 1 extrusion;

figure 4 - scheme of the 2nd extrusion;

figure 3 - the 3rd extrusion (preliminary formation of the lower cavity with simultaneous preliminary formation of local outdoor thickening);

figure 6 - scheme of the 4th pressing (forming a cavity with simultaneous formation of local outdoor thickening and bottom).

The method is as follows.

Severed from the rod blank 1 is subjected to the 1st calibration in matrix 2 punch 3, forming the cavity 4. Changing the shape of the end face 5 of the bottom part comes from the rack-piston 6 (Fig 1).

2nd calibration is carried out similarly to the 1st obtaining with alibrandi diametrically outer surface 7 and an enlarged cavity 8 of the workpiece (figure 2).

Then perform extrusion, where on the 1st extrusion (figure 3) and on the 2nd extrusion (figure 4) punch 9 in matrix form 10 upper cavity 11 of the workpiece.

Then on the 3rd extrusion produce pre-forming punch 12 of the lower cavity 13 of the workpiece with simultaneous preliminary formation of local outdoor thickening 14, thus centering the workpiece produced by the punch 12 and the diameter of the upper cavity 11 and the matrix 15 and a cylindrical bottom part 16 (figure 5).

Final 4th extrusion of the workpiece is performed by the punch 17 in the matrix 18, when the centering matrix 18 of the workpiece along its cylindrical bottom part 16, with the final formation of local outdoor thickening 20 and bottom 21, and the finished part 22 is removed by the ejector 23 of the matrix 18 (6). When you do this the same way and on the 3rd extrusion, centering 22 produced by the punch 17 and the diameter of the upper cavity 11 and the matrix 18 and the cylindrical bottom part.

Compared with the prototype of the invention allows to expand the technological capabilities of the method by providing the local outdoor thickening in the middle part of details.

The invention is industrially applicable.

Proof is the fact the manufacture of hollow parts with local thickening at the FSUE "AVOD named after Sergo".

A method of manufacturing hollow parts, including the formation of the billet upper and lower cavities of the extrusion punch in the matrix, which is carried out in two stages, as well as the formation of a bottom part with a cylindrical bottom part and local outdoor thickening, characterized in that carry out the cutting of the workpiece which is subjected to calibration, the formation of the upper cavity is produced in the first stage of extrusion, and the second stage simultaneously form the lower cavity of the bottom part and the local external thickening with centering the workpiece by the punch on the top of the cavity and in the matrix of the cylindrical bottom part.



 

Same patents:

FIELD: military equipment, applicable for manufacture of fragmentation ammunition to salvo-fire jet-propelled systems.

SUBSTANCE: the claimed method includes production of a shell by deformation and welding, arrangement of finished fragments and fastening to the ammunition body. The shell is molded of plates until a polyhedron is obtained, mainly of a trapezoidal shape with rounded off ribs, and after welding the polyhedron is deformed to a cylindrical shape by grooving, for example, in rolls with localization of deformations in three points, and a multiple, for example two-operation inner grooving, expansion with a decrease of deformation within 1 to 5 per cent, then the shell is placed in a mould, finished fragments are filled in and cast by thermoplastic material, for example, high-density polyethylene, and radial reduction in thickness is simultaneously performed over the entire outer surface, in separate symmetrical sections, for example, at least two, in the plastic area of deformation, and on the rest surface - in the flexible area, at a pressure of 60 to 80 kg/sq.cm during 44 to 46s.

EFFECT: enhanced efficiency of combat use of the ammunition by producing of an irregular stressed state in the shell of the set of finished fragments.

6 cl, 6 dwg

The invention relates to the field of metal forming and can be used in the manufacture of copper sleeves mold used for continuous casting of metal

The invention relates to the processing of metals by pressure and can be used in the manufacture of ammunition

The invention relates to a method of manufacture of cluster munitions

The invention relates to metal forming, and more particularly to a method of forming blanks shell casings

The invention relates to ammunition and more particularly to the shells, rocket-propelled missiles or mines with warhead high-explosive action, which has a shell with notches for uniform crushing to pieces

The invention relates to the field of ammunition

The invention relates to a method of manufacturing a head part with a pointed steel core bullets

The invention relates to a press-forging production and can be used for three-dimensional stamping parts variable diameter

FIELD: plastic working of metals, possibly manufacture of forged pieces with central opening.

SUBSTANCE: method comprises steps of upsetting heated initial blank; forming semi-finished product having bridge in zone of one end of its inner portion in die set without forming burr; remaining part of end surface having no contact with tool; then performing final forming, mainly in one half of open die set at displacing outer burr and with possibility of displacing inner burr; removing bridge and trimming burrs.

EFFECT: lowered metal and energy consumption at process.

20 cl, 6 dwg, 1 ex

FIELD: plastic working of metals, possibly forming forged pieces, for example rings, gear wheels, flanges.

SUBSTANCE: initial blank is heated, preliminarily shaped, finally formed and trimmed. At final forming open die set is used; said die set has gap between its upper and lower halves. Said gap is arranged in zone of forging that is formed last. Dimensions of die set are no more than respective dimensions of forging in order to prevent deforming of displaced excess of metal.

EFFECT: lowered deforming efforts, decreased metal consumption.

11 cl, 2 dwg, 1 ex

FIELD: metal working, possibly manufacture of flanged articles and articles without flanges of different alloys.

SUBSTANCE: method comprises steps of heating blank and deforming it in die set; sustaining relation of blank temperature to that of die set in range 0.7 - 7.4. Blank is heated in predetermined temperature range depending upon blank material. Said temperature range may be found from ductility diagram and(or) yield curves and(or) from blank material recrystallization diagrams.

EFFECT: enhanced factor of using metal, improved quality of articles, lowered labor consumption of forging and subsequent working of blank.

6 cl, 2 dwg, 2 ex

FIELD: plastic working of metals, possibly operations for finish working of forgings of double-end box nut wrenches.

SUBSTANCE: die set includes upper and lower plates with guiding columns, punch for punching operation mounted on upper plate, stripper, lower die for punching, half-open trimming lower die and trimming punch. Trimming lower die is mounted on upper plate; it has cutting edge and cavity arranged behind collar of cutting edge and designed for freely placing forging of nut wrench. Trimming punch is mounted on lower plate and it has embracing supporting surface for fixing forging at trimming and straightening operations.

EFFECT: enhanced quality of forging.

9 dwg, 1 ex

The invention relates to the processing of metals by pressure and can be used to obtain the forging of ingots and pre deformirovannykh billets for forging complexes

The invention relates to the processing of metals by pressure and can be used in the manufacture of forgings by forging

The invention relates to the field of metal forming

The invention relates to the processing of metals by pressure, and is intended for manufacture by forging on the universal stamping equipment ring forgings without stamping gradients

The invention relates to the production of core products with head

FIELD: plastic working of metals, possibly operations for finish working of forgings of double-end box nut wrenches.

SUBSTANCE: die set includes upper and lower plates with guiding columns, punch for punching operation mounted on upper plate, stripper, lower die for punching, half-open trimming lower die and trimming punch. Trimming lower die is mounted on upper plate; it has cutting edge and cavity arranged behind collar of cutting edge and designed for freely placing forging of nut wrench. Trimming punch is mounted on lower plate and it has embracing supporting surface for fixing forging at trimming and straightening operations.

EFFECT: enhanced quality of forging.

9 dwg, 1 ex

Up!