SU1349841A1 - Method of producing articles having holes - Google Patents

Abstract

This invention relates to methods for producing hollow axisymmetric articles with openings on a side surface, in particular roller bearing cages. The purpose of the invention is the expansion of technological capabilities by obtaining holes of a quadrangular shape. For this, the sheet blank is pulled out, in the semifinished product, holes are punched, the shape of which differs from the holes in the finished product, and then the semi-finished product is simultaneously stretched along its axis and one end of it is turned relative to the other around this axis. As a result, the semifinished product acquires the shape of the finished product, and the openings become rectangular. 1 3.p.f-ly, 6 ill. i (L 00 4: 00 4

Description

The invention relates to the processing of sheet metal by pressure, and in particular to methods for half-shells of hollow axisymmetric products of the type separated separators.

The purpose of the invention is the expansion of technological capabilities by obtaining a product with holes quadrangular, in particular;, rectangular, shape.

Fig about 1 shows the workpiece; FIG. 2, a semi-finished product after stretching; in FIG. 3 the same, after punching a hole in the bottom; Fig, 4 - the same, after punching preliminary holes on the side surface; in Fig. 5, the article after stretching and forming the holes of the final shape; on fig.b - the same, after trimming the butt. -.

The method is carried out in the following way.

The initial blank (fig. I) is cut down from a strip or ribbon, then it is carried out on its side to obtain a hollow cylindrical semi-finished product (FIG. 2) 5 in which a hole is punched in the bottom (FIG. 3) and a bit of rollers ( Fig. 4). On 3 ak lagn al nomel e d e. Deformations of production; t grow the dosu of the semi-finished product with simultaneous; The shape of one of its face faces is at an angle of 9. As a result, the semi-finished product acquires the height of the finished product 5 and the windows are shaped as a given rectangle.

Example D, G1I Ltamp of the separator ,, - with a diameter along the middle, line D 80 Mi i, TO.PCNNO 2 mm, height lif. 35 km and windows under the river; having a HO height of 25 mm and a cross between them mm, the blank is made of ribbon Art. 10 XII with a thickness of 2 mm, the amount of permissible elongation is & --0,2 ,, diameter D 130,37 mm.

Then, semi-fab is produced:

with PR

separator and

mm:

H, -1- b

H, L5

one

 r t

Ksin

- 33,

mm

t

+ 1

and try-shku holes in his day e.

9841-2

Next punch shaped holes. The opening is made with two walls parallel to the ends of the semifinished product, and two other walls 5 with curvilinear equidistant smooth surfaces. Forming each of the curved surfaces is a curve formed by

two arcs of radius R T;:

Sj

mated at a point equidistant from the parallel walls of the hole and having end sections perpendicular to the mutually parallel walls "The end sections of each curve intersect with the straight walls of the window at points lying on the common straight line forming with the straight, parallel to the axis of the product, angle b, determined from the ratio

 t-d

(

Csj

Hi-cosu

de s 451 width

+ 1).

bridges between the provisional openings; the average diameter of the semi-finished product before punching holes in it;

allow a value of 1.1a relative to the elongation of the material of the product;

-You have the holes in the finished

product.

In this example, the angle leaves

D S n „

 ten

0

The length of the curvilinear forming surface of the wall of the hole is a hole equal to the height H, the hole in the finished product.

After the floor; h: the holes in the bottom and the wall of the semi-finished product, it is stretched to within the permissible value of the relative elongation S and simultaneously rotated by an angle of 9. The resulting product has the desired shape and size D 80 mm.

HO

 25 mm, and 35 mm (without allowance for trimming the butt).

The method of stamping can be used in bearing and other

industrial areas in the manufacture of roller bearing cages, mainly cylindrical and hollow-cup products with rectangular openings on the cylindrical surface.

. The use of the proposed method allows to expand the technological capabilities in comparison with the known method by producing articles with openings of a quadrangular, in particular, rectangular shape.

Claims (2)

1. A method of producing hollow articles with openings on the side surface of sheet blanks, in which preliminary holes of a different shape than openings in the finished product are formed, and then the blank is stretched in a direction parallel to the axis of the resulting product, and the final shape is shaped m, characterized in that, in order to expand the technological possibilities due to the formation of products with quadrangular holes, from the blank, before the formation of preliminary holes, hollow olufabrikat, preliminary holes punched in its lateral surface, during the final shaping of the article simultaneously with stretching semi-finished its one end is rotated relative to the other about the longitudinal axis. 2. A method of pop, 1, differing from that with the purpose of obtaining cylindrical articles with rectangular holes, each preliminary hole is made with two walls parallel to the ends of the semi-fabrc-psat and two other walls with curvilinear equidistant smooth surfaces, each of which is formed by two arcs of radius R - | j-. match at a point. equidistant from parallel walls, openings having end sections perpendicular to parallel walls and intersecting with these walls at points lying on a common straight line forming with a straight parallel to the product axis, 25 where S is the width of the jumper between preliminary openings; the average diameter of the semi-finished product before punching holes in it; allowable value of the relative elongation of the material of the product; Nd - height of holes in the finished product, and rotate one end of the product relative to another at the same angle: D S 1 fa2.2 g /////////// /,.,/;.ДЗ FIG. 1RIGLE FIG. B Compiled by Y.Tseitlin Ryodaktbr N.Tupitsa Tehred I.Khodanych Corrector G.Reshetnik Order 5215/7 Circulation 731 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design., 4