A method of manufacturing items of type slotted bushings

 

(57) Abstract:

The inventive method of manufacture of parts of type slotted bushings is to obtain the original piece with an outer diameter equal to the outside diameter of the finished product, and an inner diameter equal to the diameter of the projections slotted holes, and the subsequent cold extrusion of internal splines. The morphology of the teeth on the full length produced in one process transition. The excess amount of the metal constituting the volume of the depressions of the slots, push in the direction opposite to the direction of movement of the punch. You get the length of the workpiece equal to the length of the finished product. Then carry out machining of forged blanks. 5 Il.

The invention relates to the field of metal forming and can be used for details type slotted bushings cardan gear hire or sleeve splined couplings of machine parts.

There is a method of direct cold extrusion products type sleeves with internal teeth on a free (floating) of the mandrel (1). The disadvantages of this method are:

the low accuracy timing profile due to incomplete zapalnyaemost the situations products, due to the occurrence of high frictional forces between the workpiece and the walls of the matrix and, consequently, low resistance plug;

the high complexity of the process, due to the need of wypracowania mandrel from the workpiece after the operation of stamping and mechanical removal of the press residue.

A known method of forming the internal slots in the tube blanks through a reduction in the floating slotted mandrel, which according to the scheme of deformation is similar to the above and has generally the same disadvantages (2).

An additional disadvantage of this method is the limited technological capabilities due to the receipt slots only a relatively small profile. Increasing the depth profile of the teeth causes loss of axial stability of the workpiece due to the occurrence of high effort in the process of reduction, as well as setting its slotted mandrel. A common shortcoming of these methods is the presence of adverse schematic of the stress state on the surface of the protrusions of the teeth due to the occurrence of tensile stresses in the deformation process, which causes a decrease in ductility and cracking.

The closest to doing what obami by direct cold extrusion, according to which one workpiece push another (3). The disadvantages of this method are:

low productivity due to the need for two process steps to obtain products with desired length of the teeth;

limited technological capabilities of the process according to the magnitude of the tooth and the length of the bushing due to the loss of the workpiece (which is pushing its axial resistance;

inability to obtain internal spline path in blind holes;

sophisticated design tools and low resistance plug.

The technical result achieved by the invention is to improve productivity, expand the technological capabilities of the process, simplify the design of the instrument and increase its durability.

This is achieved by the fact that according to the method of manufacture of parts of type slotted collet, which consists in obtaining the original piece with an outer diameter equal to the outside diameter of the finished product, and an inner diameter equal to the diameter of the projections slotted holes, and the subsequent cold extrusion of internal splines, the morphology of the teeth on the full length proizvod in the direction opposite to the direction of movement of the punch will get the length of the workpiece equal to the length of the finished product, and then carry out machining of forged blanks.

In Fig. 1 shows the position of the initial workpiece and tool before beginning the process of Fig. stage 2 of the extrusion slots of Fig. 3 is a view of the billet after extrusion of Fig. 4 section A-a and b-b of Fig. 3; Fig. 5 the finished product.

The method is carried out using a punch 1. The workpiece 2 with an outer diameter of Dnequal to the outside diameter of the finished product, placed in a matrix of 3 based on the ejector 4 (Fig. 1). Punch 1 having the lead centrifuge-guiding part 5, is injected with a slight gap in the workpiece 2 and produce extrusion of teeth on the full length l in one technological transition, displacing excess amount of the metal constituting the volume of the depressions of the slots, in the direction opposite to the direction of movement of the punch (Fig. 2). The total length of the workpiece becomes equal to the length of the finished product L. Then the punch moves back, and the workpiece remains in the matrix, since the friction force between the workpiece and the sensor exceeds the magnitude of the friction force that occurs IU the same and appoint 0.02-0.05 mm smaller than the hole diameter d of the billet (Fig. 1). The length centrifuge-guide part of the plug 5 (Fig. 1) designate constructively in the range of 5-15 mm, a lead Angle of the cone of the working portion of the punch is prescribed within 2 52-60o(Fig. 3). The height of the calibrating part of the punch accept within h 4-10 mm. removing the workpiece from the matrix produced by the ejector. To obtain the finished product perform mechanical final processing of the workpiece with the base slots (Fig. 5).

Example. The method is implemented in the laboratory upon receipt slotted bushing propeller shaft steering GAZ 3307. Preparation of outer diameter Dn32 mm and an inner diameter d18 mm, a length l of 150 mm was obtained by mechanical processing pipe lathe machine (source material: pipe ). After phosphating and emiliania blanks in the experimental stamp in one technological transition has produced precision cold extrusion of internal teeth on the full length (lo70 mm), receiving at the same time the overall length of the part L 155 mm Options slots:-101823183D9. Length centrifuge-guide part punch was 10 mm, the Extrusion was carried out on a hydraulic press PYE-100 force 1000 kN. The axial force applied to the end pubco and produced mechanical final processing of the inner and outer surfaces with the base slots to fit, required by the drawing.

A method of manufacturing items of type slotted bushings, which includes the receipt of the original piece with an outer diameter equal to the outside diameter of the finished product, and an inner diameter equal to the diameter of the projections slotted holes, and then the cold extrusion of internal splines, wherein the forming of the teeth on the full length produced in one process transition, and the excess amount of the metal constituting the volume of the depressions of the slots, push in the direction opposite to the direction of movement of the punch will get the length of the workpiece equal to the length of the finished product, and then carry out machining of forged blanks.

 

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