CN1970191A

CN1970191A - Multi-wedge synchronizing smooth butte rolling method for rolling same diameter axle type pieces by cross wedge rolling

Info

Publication number: CN1970191A
Application number: CN 200610165034
Authority: CN
Inventors: 束学道; 胡正寰; 赵静; 颜世公; 李玉京
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2006-12-12
Filing date: 2006-12-12
Publication date: 2007-05-30
Anticipated expiration: 2026-12-12
Also published as: CN100435999C

Abstract

It relates to the rolling method for the smooth jointing section of same diameter shaft parts synchronously. It starts from wedging the inner wedge into an A-A location round blank, rolling it to a B-B position V shape pyramidal face, wedging the outside wedge when the inner one expanding, rolling the outside wedge into C-C location conical shape, with the jointing section a slant step, then both inner and outer wedges entering into expanding rolling stage, inner wedge jointing to the slant step. Metal expansion at the jointing section can transit smoothly, without folding, doubling. It has fine quality, reduced material and better availability ratio, free from turning to the half shaft thin bar of the vehicle.

Description

A kind of Multi-wedge Cross Wedge Rolling is synchronously rolling with the smooth Butt Section of diameter axle type pieces milling method

Technical field

The invention belongs to axial workpiece plastic forming technology field, provide a kind of Multi-wedge Cross Wedge Rolling synchronously rolling with the diameter axle type part, interior wedge and the smooth milling method of outer wedge Butt Section rolled piece are applicable to the roll forming of many wedges of longaxones parts.

Background technology

At present, the shaping of practical application both at home and abroad is a forging and molding as the main method of large-scale long shaft class parts such as train axle, and its production efficiency is 0.3～0.5 of per minute, and stock utilization is about 65%; For some diameters less than φ 120mm the longaxones parts of length below 1000mm, except that adopting forging method, also have part to adopt the roll forming of cross wedge rolling list wedge, its production efficiency is 2～6 of per minutes, stock utilization is 78～82%.Compare for wedge roll forming of cross wedge rolling list and forging and molding, although production efficiency and stock utilization all are greatly improved, but for the long longaxones parts of mill length, single wedge technology increases significantly because of mould diameter and apparatus body size, cost of investment improves greatly, makes single wedge technology be subjected to a certain degree restriction in practical application.

With typical longaxones parts automobile axle shaft is example, EQ153 automobile axle shaft as shown in Figure 1, among the figure:

L1=120mm, L2=1033mm, L3=110mm, L4=892mm, d1=φ 95mm, d2=φ 53mm, d3=φ 63mm semiaxis thin rod part (same diameter) length accounts for more than 70% of whole semiaxis length.Adopt the required roll surface length of single wedge rolling mill practice and many wedges rolling mill practice as shown in Figure 2, among the figure

LM＝2812.99mm，LS＝4300.81mm。Adopting the rolling die needed diameter of many wedges is φ 1000mm, and adopting the required mould diameter of single wedge technology is φ 1500mm.Obviously, the rolling longaxones parts of many wedges rolling mill practice can significantly reduce cost, and uses than skinny device to replace single wedge rolling and the bulky equipment of needs is easy to realize the economization production of longaxones parts.

Many wedges cross wedge rolling forming is during with the diameter axle type part, because changeover portion of the rolling existence of inside and outside wedge, defectives such as rolled piece surface unfolded, pipe when the wedge changeover portion is rolling inside and outside how guaranteeing, making Butt Section, rolled piece surface rolling smooth, is a key issue of many wedges cross wedge rolling forming longaxones parts.How this patent guarantees to invent under the rolling background with the rolling smooth key issue in diameter axle type pieces Butt Section of Multi-wedge Cross Wedge Rolling in solution.

Summary of the invention

The object of the invention is: provide a kind of Multi-wedge Cross Wedge Rolling synchronously rolling with the diameter axle type part, interior wedge and outer wedge Butt Section rolled piece surface rolling smoothing method, it is synchronously rolling with defect problems such as wedge Butt Section rolled piece surface laps, pipe inside and outside the diameter axle type pieces to solve many wedges, guarantee that the rolled piece surface transition is smooth, realize the economization production of longaxones parts.

The wheel chair access rolled piece of the rolling same diameter of Multi-wedge Cross Wedge Rolling, outer wedge play wedge shape, in will directly having influence on the rolling Butt Section of wedge rolled piece in the surface quality that plays the wedge position, as: whether the Butt Section transition position smooth smooth, has or not pipe folding etc.Outer wedge plays the wedge principle: the one, and outer wedge wedging section is the axial flow of metal during influence of rolled not; The 2nd, inside and outside wedge transition position rolled piece surface does not produce defective, guarantees that transition is smooth.The present invention adopts outer wedge wedging section that rolled piece is rolled into the sloping platform rank as the butt joint shape, as shown in Figure 3, and α among the figure _zBe the transition angle.

Fig. 4 is concrete rolling mill practice process, and interior wedge is at first wedged circular blank, sees the A-A position; Shape of rolling piece is the V-type conical surface after interior wedge wedging section finishes, and sees the B-B position; When interior wedge entered broadening, outer wedge had begun wedge, and it is the V-type conical surface that outer wedge plays the rolling shape of rolling piece of the wedge end outer wedge in back, and the Butt Section is the sloping platform rank, sees the C-C position, the similar rolling conical part of this technology, but must guarantee rational transition angle; The D-D position is the shape of inside and outside wedge rolled piece when all entering broadening, and the part that mid diameter is big need be further rolling by interior wedge, comprises that rolling Butt Section is the sloping platform rank, and the part that the both sides diameter is big is further rolling by outer wedge; The E-E position is a shape of rolling piece after rolling the finishing, and the centre is a thin rod part, and the rolling transition in Butt Section is smooth.

Adopt the wedge mode that rises of sloping platform rank shape, key will be selected rational transition angle, and metal is in the extension transition more reposefully of joint, does not form defectives such as folding, pipe, obtains the same diameter axle type pieces in smooth Butt Section.Because the contraction percentage of area and transition angle have the greatest impact to changeover portion rolled piece surface quality, the present invention is according to theory analysis and a large amount of experimental result, obtained under the different section shrinkage factor, do not produce the transition angle range of choice of defective on inside and outside wedge changeover portion rolled piece surface: the contraction percentage of area is greater than 75%, and the transition angle is selected 25 °～35 °; The contraction percentage of area is 65%～75%, and the transition angle is selected 35 °～40 °; The contraction percentage of area is 45%～65%, and the transition angle is selected 40 °～45 °; The contraction percentage of area is below 45%, and the transition angle is selected 45 °～50 °.

The invention has the advantages that:

1) the rolled piece surface quality is good, saves material.

2) stock utilization improves, and need not carry out turning processing for the automobile axle shaft thin rod part, can guarantee its precision by rolling, and energy-conservation operation reduces production costs.

3) enlarged the range of application of Multi-wedge Cross Wedge Rolling rolling technique.

Description of drawings

Fig. 1 is the EQ153 automobile axle shaft, wherein,

L1＝120mm，L2＝1033mm，L3＝110mm，L4＝892mm，d1＝φ95mm，d2＝φ53mm，d3＝φ63mm

Fig. 2 is an EQ153 automobile axle shaft mould expanded view, wherein, and many wedges mould expanded view 1,

LM=2812.99mm; Single wedge mould expanded view 2, LS=4300.81mm.

Fig. 3 is changeover portion sloping platform of the present invention rank schematic diagrames, wherein α _zBe the transition angle.

Fig. 4 is a rolling mill practice procedure chart of the present invention, wherein A-A is rolled piece blank figure, and B-B is that interior wedge wedging section finishes the back shape of rolling piece, and C-C is that outer wedge plays the shape of rolling piece that shuts out after wedge finishes, D-D is the shape of inside and outside wedge rolled piece when all entering normal broadening, E-E is rolling finish after shape of rolling piece.

Fig. 5 is of the present invention a kind of rolling with many wedges of diameter shaft part mould photo figure.

Fig. 6 is rolling same many wedges of the diameter shaft part mould expanded view of the present invention, wherein,

α＝28°，β＝8°，α _z＝35°，HH＝190.35mm，DD＝51.86mm，

L1＝276.52mm，L2＝41.19mm。

Fig. 7 is the finished figure of the rolling same diameter shaft part of the present invention.

The specific embodiment

Fig. 5, Fig. 6 and Fig. 7 are an embodiment of Multi-wedge Cross Wedge Rolling shaping optical axis, transition angle α _z=35 °, with diameter of phi=40mm, length is the round bar blank of 210mm, and heating-up temperature is about 1100 ℃, sends between two homodromal Multi-wedge Cross Wedge Rolling moulds with two pairs of wedges by the axial admission device to be rolled, mould diameter is φ 630mm, die drawing is Fig. 5, and expanded view is Fig. 6, and each parameter value is as follows among Fig. 6: α=28 °, β=8 °, α _z=35 °, HH=190.35mm, DD=51.86mm, L1=276.52mm, L2=41.19mm, L3=427.14mm, L4=1282.92mm, the rolling finished product with diameter shaft of many wedges (long is 460mm) is as shown in Figure 7.

Claims

1. a Multi-wedge Cross Wedge Rolling is synchronously rolling is characterized in that with the smooth Butt Section of diameter axle type pieces milling method interior wedge is at first wedged A-A position circular blank; Shape of rolling piece is the V-type conical surface of B-B position after interior wedge wedging section finishes; When interior wedge entered the broadening section, outer wedge had begun wedge, and outer wedge plays wedge, and to finish the shape of rolling piece that the outer wedge in back shuts out be the taper of C-C position, and the Butt Section is the sloping platform rank; Afterwards, it is rolling that inside and outside wedge all enters broadening, and sloping platform rank, the rolling Butt Section of interior wedge are until rolling end; Adopt the wedge mode that rises of sloping platform rank shape, according to: the contraction percentage of area is greater than 75%, and the transition angle is selected 25 °～35 °; The contraction percentage of area is 65%～75%, and the transition angle is selected 35 °～40 °; The contraction percentage of area is 45%～65%, and the transition angle is selected 40 °～45 °; The contraction percentage of area is below 45%, and the transition angle is selected 45 °～50 °, chooses the transition angle, and metal does not form folding, skin lamination defect in the just transition reposefully of extension of joint, obtains the same diameter axle type pieces in smooth Butt Section.