CN102166609A - Asymmetric shaft parts cross wedge rolling and stable rolling method - Google Patents

Abstract

The invention discloses an asymmetric shaft parts cross wedge rolling and stable rolling method which is characterized by comprising the steps of respectively arranging a block wedge at each of two outer ends of a rolling mould, wherein the slant direction of each block wedge is accordant with the flow direction of the end face of a part to be rolled; setting the chamfer angle of one side of each block wedge which is contacted with the part to be rolled to be 10-30 degrees; heating a blank to be rolled to be at 1000-1200 DEBG C; and sending the blank into a rolling mould through an axial feed device on a cross wedge rolling device to be rolled so as to obtain qualified asymmetric shaft parts. The method has the advantages that when the asymmetric shaft parts are rolled, the unbalanced axial force is born by the block wedges at two sides of the rolling mould, the unstable rolling caused by the axial jumping since the parameter of the mould can not be properly selected is overcome, the blank is guaranteed to be positioned on a rolling centre line during rolling, the accidents such as the unstable rolling, steel clamping and the like during rolling can be avoided, the smooth rolling of the asymmetric shaft parts can be effectively guaranteed, and the mechanical capacity of rolled products can be guaranteed.

Description

A kind of asymmetric axle class part cross wedge rolling stable rolling method

Technical field

The present invention relates to a kind of axial workpiece plastic forming technology, relate in particular to a kind of asymmetric axle class part cross wedge rolling stable rolling method.

Background technology

Cross wedge rolling is a kind of axial workpiece New Forming Process, has advantages such as efficient, material-saving, has at home and abroad obtained using more widely.And along with the fast development of transportation, the demand of various axial workpieces grows with each passing day, macrotype axes series parts especially, and as railway vehicle axle and automobile axle shaft etc., but major part is asymmetric axial workpiece in these parts.And when rolling asymmetrical axial workpiece, because the die parameters of rolling asymmetric part is chosen can not be just the same, and the parameter of axial force balance is chosen and is not also had the theory determined, if rule of thumb choose die parameters, the axial force that asymmetric part is produced when then rolling is difficult to balance, the blank that is rolled is difficult to remain on the rolling centerline, cause occurring in the operation of rolling accidents such as rolling instability, steel-fastening, hinder carrying out smoothly of the operation of rolling, also influence mechanical performance of products simultaneously.

Summary of the invention

Technical problem to be solved by this invention provides a kind of asymmetric axle class part cross wedge rolling stable rolling method that realizes asymmetric axle class part stable rolling.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of asymmetric axle class part cross wedge rolling stable rolling method, position, two outer ends at rolling mould is provided with the retaining wedge respectively, the incline direction of retaining wedge with by to be rolled the part end face flow direction consistent, and the tiltangle that keeps off wedge is set _iFor:

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In the formula:

Represent to be used on the rolling mould forming angle of rolling asymmetric axle class part i part,

Represent to be used on the rolling mould broadening angle of rolling asymmetric axle class part i part, the original radius of representing blank to be rolled, the radius of representing the asymmetric axle class part i part after rolling the finishing, and to be provided with on the retaining wedge with the chamfering of being rolled the side that part contacts be 10～30 °, then blank to be rolled is heated to 1000～1200 ℃, by the axial admission device on the cross wedge rolling machine blank is sent to be rolled in this rolling mould and promptly obtains qualified asymmetric axial workpiece.

Compared with prior art, advantage of the present invention is owing at the position, two outer ends of rolling mould the retaining wedge is set respectively, when rolling asymmetric axial workpiece, by the two ends of rolled piece all the time with the retaining wedge contact, unbalanced axial force is born by the ambilateral retaining wedge of rolling die, overcome because die parameters is chosen the unstable rolling phenomenon that the improper axial motion that causes causes, guaranteed that blank is positioned on the rolling centerline when rolling, avoided rolling instability in the operation of rolling, the generation of accidents such as steel-fastening, guarantee the rolling smoothly of asymmetric axle class part effectively, also guaranteed the mechanical performance of products that rolls out simultaneously.

Description of drawings

Fig. 1 is the finished figure of the asymmetric axle that the embodiment of the invention rolled out;

Fig. 2 is the stereogram of rolling mould used in the present invention;

Fig. 3 is the expanded view of rolling mould used in the present invention;

Fig. 4 is for keeping off the cutaway view at wedge (A-A place) on the rolling mould of the present invention.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As shown in the figure, utilize the detailed process of the rolling asymmetric axle as shown in Figure 1 of this milling method as follows:

Retaining wedge 1,2 is set respectively at the position, two outer ends of rolling mould, and the incline direction of retaining wedge 1,2 is with to be rolled the part end face flow direction consistent, and the tiltangle of the retaining wedge 1 on the left of being positioned at is set ₁Be 4.12 °, be positioned at the tiltangle of the retaining wedge 2 on right side ₂Be 5.04 °, and be provided with on the retaining wedge 1 and the undercut ss of being rolled the side that part contacts ₁With on the retaining wedge 2 with the undercut ss of being rolled the side that part contacts ₂Be 15 °, then blank to be rolled be heated to 1200 ℃, by the axial admission device on the cross wedge rolling machine blank is sent to and is rolled the asymmetric axle that promptly obtains as shown in Figure 1 in this rolling mould.

In the foregoing description, the tiltangle of retaining wedge 1,2 ₁, θ ₂Calculate by following method:

?

In the formula:

Represent to be used on the rolling mould forming angle of rolling asymmetric axle class part I part,

Represent to be used on the rolling mould broadening angle of rolling asymmetric axle class part I part, represent the original radius of blank to be rolled, represent the asymmetric axle class part I radius partly after rolling the finishing.

?

In the formula:

Represent to be used on the rolling mould forming angle of rolling asymmetric axle class part II part,

Represent to be used on the rolling mould broadening angle of rolling asymmetric axle class part II part, represent the original radius of blank to be rolled, represent the asymmetric axle class part II radius partly after rolling the finishing.

Claims (1)

1. asymmetric axle class part cross wedge rolling stable rolling method, it is characterized in that: the position, two outer ends at rolling mould is provided with the retaining wedge respectively, and the incline direction of retaining wedge is with to be rolled the part end face flow direction consistent, and the tiltangle that keeps off wedge is set _iFor:

?

In the formula:

Represent to be used on the rolling mould forming angle of rolling asymmetric axle class part i part,

Represent to be used on the rolling mould broadening angle of rolling asymmetric axle class part i part, the original radius of representing blank to be rolled, the radius of representing the asymmetric axle class part i part after rolling the finishing, and to be provided with on the retaining wedge with the chamfering of being rolled the side that part contacts be 10～30 °, then blank to be rolled is heated to 1000～1200 ℃, by the axial admission device on the cross wedge rolling machine blank is sent to be rolled in this rolling mould and promptly obtains qualified asymmetric axial workpiece.

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