RU2226136C2 - Method for making cone retainers of large-size bearing assemblies - Google Patents

Abstract

FIELD: plastic metal working, possibly manufacture of cone retainers with bead, mainly of large-size bearing assemblies. SUBSTANCE: method comprises steps of cutting measured-length strip blanks; making on each blank along its whole length longitudinal concentrator spaced from edge by distance equal to bead width and being in the form of groove with apex angle equal to angle between lateral wall of retainer and its bead; punching windows for rollers in measured-length blank; bending strip blank to ring and welding its ends for producing annular blank; heating part of annular blank along its height at least until 750 C and expanding said part for forming cone; then squeezing annular blank in die set, expanding it, shaping bead bent inside and sizing blank during one stroke of press. EFFECT: enhanced efficiency. 4 dwg, 1 ex

Description

The invention relates to the processing of metals by pressure and can be used in the bearing industry in the manufacture of cages with a bead of predominantly large bearings.

Closest to the invention is a method for the manufacture of cages of large-sized tapered bearings, including cutting sheet metal of measured strip blanks, punching in the measured blank of windows for rollers, bending the blank into a ring, welding its ends to produce an annular blank, crimping it and distributing it to form a cone, the formation of the bent inward side and calibration (US, US Pat. No. 4212095, 07/15/1980, 21 K 1/05).

The disadvantage of this method is the use of additional equipment for calibration and flanging. In addition, in the manufacture of large-sized bearing cages during stamping at the workpiece dispensing section under the influence of certain tensile forces, a break in the weld is possible, and in the case of loss of stability in the case of buckling on the cage, a circular wave may form (buckling) and, as a result folding

The objective of the invention is to increase productivity.

The technical result is achieved by the fact that in the method of manufacturing cages of large-sized tapered bearings, including cutting sheet metal of measured strip blanks, punching in the measured blank of windows for rollers, bending the blank into a ring, welding its ends to obtain an annular blank, crimping and distributing it to form the cone, the formation of the bent inward side and calibration, on the measuring floor of the workpiece along its entire length at a distance from the edge equal to the width of the side, perform a longitudinal hub in the form of grooves with an angle at the apex equal to the angle between the side wall of the separator and its side, the part of the annular workpiece in height, intended for distribution, which is carried out by a punch, is heated to a temperature of at least 750 ° C, and the crimping of the annular workpiece, its distribution, the formation of a bent bead and calibration is carried out in a stamp in one stroke of the press.

The method is most effective for the manufacture of large-sized conical products from blanks with a relative wall thickness of the workpiece, for example, S / D≈0.01, where S is the wall thickness of the annular workpiece, D is the outer diameter of the workpiece. The zone of plastic deformation of the workpiece consists of two sections: the crimping section and the distribution section. When combining the distribution with crimping, the distribution takes place more intensively, therefore, to eliminate the possibility of destruction of the edge of the workpiece, the part of the ring workpiece intended for distribution is heated to a temperature of at least 750 ° C.

Performing a longitudinal concentrator on the workpiece reduces the height of the crimping section of the annular workpiece by the bead size, since due to the presence of the concentrator, the molding process begins with the formation of the bead inside the workpiece, and then a cone is obtained by combining the distribution and crimping process. The stamping process ends with the calibration of all product surfaces at the end of the press stroke.

Figure 1 presents the technological scheme of shaping, the starting position;

Figure 2 - the shape of the hub on the annular blank;

Figure 3 is a diagram of the formation at the flanging stage;

Figure 4 - diagram of the end of the formation of the cone and the side of the separator and its calibration.

A method of manufacturing a conical cage of large bearings is as follows.

A longitudinal concentrator in the form of an angular groove with an angle α at an apex equal to the angle between the side wall and the side of the separator and depth h = 0.1 ... 0.25 thickness of the workpiece. Then the strip billet is bent into a ring, while the hub passes along the inner surface of the ring billet. The ends of the preform are welded, after which the annular preform is annealed to relieve stress. Part of the workpiece in height, which will be subjected to the distribution of the punch, is heated to a temperature of at least 750 ° C, since below the indicated temperature the metal of the workpiece does not have sufficient ductility for hot stamping.

The heated preform 1 is mounted on the punch 2, the matrix 3 is uniformly lowered onto the annular preform. With further lowering of the matrix with a certain effort in the presence of a concentrator on the workpiece, before the crimping process of the workpiece begins, the process of side formation begins according to the law of least resistance, first along the conical part of the matrix 3, and then along its flat part into the inside of the annular workpiece (Fig. 3 ) Simultaneously with the crimping, the distribution of the heated part of the preform starts with the punch 2. Further lowering of the matrix 3 (figure 4) leads to the final shaping and calibration of the separator both on its conical part and on the board between the reliefs of the punch 2 and matrix 3.

When the matrix 3 is raised to its initial position, the finished separator is removed with pliers from the punch 2. This completes the shaping process.

Example. From a ring cylindrical billet with a diameter of D = 528 mm, a generatrix height H = 121.5 mm and a wall thickness of S = 7 mm, it is required to make a conical cage of a large-sized roller bearing about a cone angle of 11 ° 49 'and with an inner side width of b = 13.5 mm

Initially, strips 1636 mm long are made from a sheet cut by guillotine shears, on which a longitudinal concentrator is then cut with a cutter in the form of an angular groove with an angle at the apex of α = 102 ° and a depth of h = 1.5 mm at a distance of b = 13.5 mm from the edge .

The preforms thus obtained are bent into a ring with an outer diameter of D = 528 mm on a three-roll bending machine and the joint is welded by electric arc welding with an UONI 13/45 electrode. In this case, the concentrator passes along the inner surface of the annular blank. After welding, the ring blanks are annealed to relieve internal stresses. Then the part of the workpiece in height, which is subjected to the distribution of the punch, equal to 60 mm, is heated to a temperature of not less than 750 ° C and the heated workpiece is processed to the required dimensions in the stamp in a single stroke on a press with a force of 2000 tf.

Claims (1)

A method of manufacturing conical cages for large-sized bearings, including cutting of measured strip blanks from sheet material, punching windows for rollers in a measured blank, bending the blank into a ring, welding its ends to produce an annular blank, crimping and distributing it to form a cone, forming an inwardly curved bead and calibration, characterized in that on the measured strip blank along its entire length at a distance from the edge equal to the bead width, a longitudinal concentrator is made in the form of a groove with an angle at the apex, p the corner between the side wall of the separator and its side, the part of the annular billet for height, intended for distribution, which is carried out by a punch, is heated to a temperature of at least 750 ° C, and the crimping of the annular billet, its distribution, the formation of a bent bead and calibration are performed in a stamp for one press move.

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