SU1013238A1 - Method of working crankshaft bearing fillet - Google Patents

Abstract

METHOD OF TREATING THE HALTELS OF THE STEPPED SHAFT, including me) 4, t, f C i - ri. -. ; .-iit.f.ihji; .i f. :.-lv -. ; 1 - "1., ;;. With --i, JK; :: 4i; - ys -;. A chanting of the fillet zone and its subsequent cold plastic deformation with a tool with a profile radius equal to a given fillet radius, distinguished by that, in order to expand the possibilities of the method and increase the shaft fatigue resistance, in the zone the fillets are machined to perform an additional step, the length of which along the generator is equal to its height and is 0.4 g 0.5 of the fillet radius, and then the additional step is subjected to plastic deformation . i 8

Description

The invention relates to mechanical engineering, to the technology of work hardening of parts of mass.

Known methods of processing the stepped shaft fillets, including machining the fillet zone and its subsequent cold plastic deformation with a tool with a profile radius equal to the specified fillet radius 1 Ts.

The disadvantages of the known methods are the low degree of reinforcement of the fillet and the impossibility of applying the method for fillet transitions of large sizes.

The aim of the invention is to expand the possibilities of the method by treating large fillets of radius and increasing the resistance to fatigue and shafts due to the implementation of significant degrees of plastic deformation in the fillet zones. .

This goal is achieved in that, according to the method of processing the stepped shaft fillets, which include machining the fillet zone and its subsequent cold plastic deformation with an instrument with a profile radius equal to the specified fillet radius, in the fillet zone, an additional step, with length, is machined in the fillet zone. generatrix is equal to its height and is 0.4. 0.5-radius of fillets, and then an additional step is subjected to plastic deformation.

Fig. 1 shows the principle of the proposed method, where a-) the profile of the inlet fillet made by the current b j position of the roller (ball) at the beginning of deformation; c) position of the roller at the end of deformation; formed fillet; in fig. 2 - design scheme for the deformation of the fillet.

The proposed method is as follows.

A fillet transition with an additional step is made by machining;

generatrix is equal to its height and is 0.4-0.5 of the radius of the given fillet (Fig. 1a). Then, plastic deformation of an additional roller stage with a profile radius equal to the associated radius of fillets (Fig. 16) is carried out. The deformation is carried out by static or dynamic method by pressure of a roller or ball in the direction at an angle of 45 ° to the shaft axis until a fillet transition is formed (Fig. 1c).

The dimensions of the extra step are determined from the following. To complete the formation, it is necessary that the amount of metal in the additional step is equal to the amount of metal in the formed hyltel, i.e. in the longitudinal section of the shaft (Fig. 2), the area of the figure must be equal

e, R2..1jrR2,

from a 0,464R,

where a is the length of the height of an additional step along the generatrix; R is the radius of the fillet.

Thus, the length (the height of the stand is chosen within 0.4 - 0.5 of a given radius of fillet. In the case of a step with a length (height} less than 0.4 R, the metal will be missing during the formation of the fillet, shaft length. If the length (step height exceeds 0.5R), then excess metal is formed (overflow) on the shaft working surface.

The proposed method provides for obtaining reinforced fillets of a large radius with much less force per tool than in the known methods. This avoids the curvature of the shaft axis, increases the durability of the deforming tool and reduces the rigidity requirements of the process equipment.

w2

Claims (1)

. METHOD FOR PROCESSING A STEEL SHAFT GALTEL, including mechanical processing of the fillet zone and its subsequent cold plastic deformation with a tool with a profile radius equal to the specified fillet radius, characterized in that, in order to expand the possibility of the method and increase the shaft fatigue resistance, by machining in the fillet zone perform an additional step, the length of which along the generatrix is equal to its height and is 0.4t 0.5 of the fillet radius, and then the additional step is subjected to plastic deformation uring.