CN1219610C - Automobile semiaxle wedge cross-rolling precision shaping method - Google Patents

Abstract

The present invention provides a wedge cross-rolling multiple wedge precision forming method for Automobile semi-axes, which is suitable for rolling and forming large-scale long axis parts. Multiple wedge precision rolling and forming technology is used for installing multiple wedge mould rolling semi-axes with 2 to 6 pairs of wedges on a wedge cross-rolling mill; round bars are heated to 1000 to 1200 DEG C and fed between two multiple wedge moulds rotating in the same direction and having 2 to 6 pairs of wedges for rolling through an axial feeding device. Parameter forming angles of the moulds are alpha =18 to 34 DEG C, and spreading angles are beta= 4 to 12 DEG C, beta<i> =beta + *thet <k>, i is the sequence number of the wedges, and the thet<k> is the included angle of the movement amount curved line of the end surface of the spreading section of the k wedge and a centre line of a roll; therefore, the rolling length of the semi-axes are simultaneously rolled by the 2 to 6 pairs of wedges. The present invention has the advantages that compared with the present wedge cross-rolling single wedge semi-axis producing method, the present invention has the advantages of obviously saving roll surfaces of the moulds, reducing diameters of the moulds, reducing weight of equipment, reducing construction cost, etc., and the present invention can realize the economical production of the semi-axes on a small rolling mill.

Description

A kind of automobile axle shaft wedge rolling precision forming method

Technical field

The invention belongs to axial workpiece plastic forming technology field, a kind of automobile axle shaft Multi-wedge Cross Wedge Rolling accurate forming method particularly is provided, be applicable to the roll forming of large-scale long shaft class part.

Background technology

Automobile axle shaft is one of vital part of automobile, belongs to large-scale long shaft class part (greater than 900mm).At present, produce the semiaxis main method both at home and abroad and have two kinds:

1) forging and molding, its production efficiency are 0.3～0.5 of per minute, and stock utilization is about 65%;

2) cross wedge rolling list wedge roll forming, its production efficiency are 2～6 of per minutes, and stock utilization is 78～82%.

Wedge roll forming of cross wedge rolling list and forging and molding, although production efficiency and stock utilization all are greatly improved, but because semiaxis belongs to large-scale long shaft class part, adopt single wedge cross wedge rolling Rolling Production, mould diameter will arrive Φ 1200mm at least, causes apparatus body weight to increase, and mould increases, the Mould Machining cost improves greatly, so the rolling automobile axle shaft of single wedge technology also is subjected to restriction to a certain degree in practical application.Adopt the rolling semiaxis of many wedges precise forming process, mould diameter can be reduced to φ 700mm～Φ 850mm, apparatus body weight is corresponding can to reduce to 45～50 tons by 70 tons.Therefore, the rolling semiaxis of many wedges precise forming process 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 automobile axle shaft.

Summary of the invention

The object of the invention is: a kind of automobile axle shaft Multi-wedge Cross Wedge Rolling accurate forming method is provided, solve single wedge and produced problems such as the semiaxis mould diameter is big, equipment is huge and manufacturing expense is expensive and forging method production efficiency is low, stock utilization is low, realized the production of semiaxis economization.

The present invention adopts many wedges precision rolling forming technology, and the rolling semiaxis of many wedges mould with 2～6 pairs of wedges is installed on cross wedge rolling machine.Round bar is heated to 1000～1200 ℃, by the axial admission device send into two in the same way rotation have between many wedges mould (Fig. 1) of 2～6 pairs of wedges and be rolled, the semiaxis of mill product is Fig. 2.The die parameters forming angle is got α=18～34 °, and broadening angle is got β=4～12 °, ${\mathrm{\&beta;}}_i=\mathrm{\&beta;}+\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;}}_k,$ I is a wedge number, θ _kIt is the angle of the k wedge broadening section movement of the end curve and the roll line of centres.It is simultaneously rolling by 2～6 pairs of wedges that semiaxis is rolled length like this.

The invention has the advantages that:

Produce the semiaxis method relatively with single wedge, have remarkable saving mould roll surface and reduce mould diameter, alleviate weight of equipment and reduce advantages such as cost, on less milling train, just can realize the production of semiaxis economization.

Compare with existing FMT, advantage is as follows:

1) single productivity is high about more than 4～6 times.Forging method is produced semiaxis, need be with the semiaxis end through the poly-material of 3～4 passages, the flat forging, and then reverse end for end poly-material, the flat forging, operation is many, mould is many; The Multi-wedge Cross Wedge Rolling method is produced semiaxis and be need not to reverse end for end direct roll forming.

2) stock utilization on average improves about 10%～20%.Forging method is produced semiaxis, and its thin rod part must carry out turning processing; And the rolling semiaxis of Multi-wedge Cross Wedge Rolling technology, its thin rod part need not carry out turning processing.

3) cleaner production.Forging method is produced semiaxis, and its noise is usually greater than 100 decibels, and many wedges cross wedge rolling method is produced noise less than 60 decibels.

4) machining processes reduces.Because the semiaxis dimensional accuracy that existing Forging Technology is produced is not as cross wedge rolling, the former capital will be through fine finishining again after the roughing, and cross wedge rolling can directly carry out fine finishining, and wherein semiaxis thin rod part branch need not processed, and can guarantee its precision by rolling, so energy-conservation operation.

5) production cost is low.Cross wedge rolling and existing FMT relatively have that mould is simple, efficient is high, a material-saving, province's manufacturing procedure etc., and its production cost can descend 15～30%.

Description of drawings

Fig. 1 is a kind of many wedges of automobile axle shaft die drawing of the present invention.

Fig. 2 is a kind of automobile axle shaft mill product figure of the present invention.

Fig. 3 is 3 pairs of wedge mould expanded views of a kind of car rear axle semi-axis of the present invention.Among the figure, broadening angle β ₁=7 °, β ₂=12.3519 °, β ₃=14.3519 °, β ₄=14.3519 °, forming angle α ₁=α ₂=26 °, α ₃=α ₄=30 °; Movement of the end curve inclination angle [theta] ₁=5.3519 °; H ₀=2483mm, H ₁=1783.8mm; W ₀=1258mm, W ₀₁=573mm, W ₁=452mm, W ₂=145.48mm, W ₃=113.4mm, W ₄=15.3mm, W ₅=76.9mm, W ₁₂=54.52mm.

Fig. 4 is a kind of car rear axle semi-axis mill product figure of the present invention.Among the figure, D1=Φ 69mm, D2=Φ 52.5mm, D3=Φ 69mm, D4=Φ 90mm, L1=1049mm, L2=150mm, L3=852mm, L4=148mm.

Fig. 5 is a kind of car rear axle semi-axis finished figure of the present invention.Among the figure, D1=Φ 64mm, D2=Φ 52.5mm, D3=Φ 64mm, D4=Φ 216mm, L1=1030mm, L2=102mm, L3=856mm, L4=32mm, L5=15mm, L6=23mm, L7=25mm.

The specific embodiment

Fig. 3, Fig. 4 and Fig. 5 are an embodiment of many wedges precision form car rear axle semi-axis, with diameter of phi=90mm, length is the round bar blank of 554mm, heating-up temperature is 1100 ℃, send between two homodromal 3 pairs of wedge car rear axle semi-axis moulds by the axial admission device and to be rolled, the mould maximum gauge is Φ 850mm, the die drawing expanded view is Fig. 3, the car rear axle semi-axis mill product as shown in Figure 4, do not put down forging or pendulum Rolling with rolling the end in Fig. 4 car rear axle semi-axis mill product, carry out local fine finishining again, obtain the finished product car rear axle semi-axis as shown in Figure 5.

Claims (1)

1, a kind of automobile axle shaft Multi-wedge Cross Wedge Rolling accurate forming method, it is characterized in that: the rolling semiaxis of many wedges mould with 2～6 pairs of wedges is installed on cross wedge rolling machine, round bar is heated to 1000～1200 ℃, by the axial admission device send into two in the same way rotation have between many wedges mould of 2～6 pairs of wedges and be rolled, the die parameters forming angle is got α=18～34 °, broadening angle and is got β=4～12 ° ${\mathrm{\&beta;}}_i=\mathrm{\&beta;}+\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{\mathrm{\&theta;}}_k,$ I is a wedge number, θ _kBe the angle of the k wedge broadening section movement of the end curve and the roll line of centres, it is simultaneously rolling by 2～6 pairs of wedges that semiaxis is rolled length like this.

Images