CN102886458B

CN102886458B - Overall composite inner high-pressure flow type bulging process for car drive axle

Info

Publication number: CN102886458B
Application number: CN201210357400.9A
Authority: CN
Inventors: 王春涛; 龚仕林; 徐�明; 雷亚; 周雄; 陈超; 杨治明; 刘复元; 董季玲; 欧忠文; 胡玉梅
Original assignee: Chongqing University of Science and Technology
Current assignee: Chongqing University of Science and Technology
Priority date: 2012-09-24
Filing date: 2012-09-24
Publication date: 2014-09-24
Anticipated expiration: 2032-09-24
Also published as: CN102886458A

Abstract

The invention relates to an overall composite inner high-pressure flow type bulging process for a car drive axle. The process comprises the following steps that 1), an opened axle shell workpiece is put into a bulging outer die; 2), a bulging inner die extends to the bulging deforming area of the axle shell workpiece from an inner hole in one end of the axle shell workpiece; 3), the bulging outer die is closed, and a support mechanism of the bulging outer die is pressed on a transitional surface; 4), two thrust hydraulic cylinders positioned at two ends of the bulging inner die apply equal auxiliary thrust parallel to the axial direction of the axle shell workpiece to the bulging inner die, and a multi-stage high-pressure flow type hydraulic cylinder positioned between an upper die block and a lower die block applies bulging hydraulic pressure vertical to the axial direction of the axle shell workpiece to the bulging inner die; the upper die block and a lower die block of the bulging inner die respectively extrude the inner walls of the axle shell workpiece positioned at two sides of an open under the bulging hydraulic pressure, and the axle shell workpiece is bulged and deformed under the action of the bulging inner die and the bulging outer die; and the bulging hydraulic pressure is larger than the auxiliary thrust. The flow speed of hydraulic oil in the multi-stage high-pressure flow type hydraulic cylinder is 0-10L/min.

Description

The whole compound inner high voltage flow-type bulging process of automobile drive axle

Technical field

The invention belongs to Machining Technology field, concrete is the whole compound inner high voltage flow-type bulging process of a kind of automobile drive axle.

Background technology

Auto manufacturing has very important effect in Chinese national economy, in recent years, the national economy high speed development of China, meanwhile auto industry is also flourish.Performance from vehicle complete vehicle to parts, all become the major subjects of current industrial research, and axle housing is as one of strength member of automobile, axle housing not only plays supporting role to automobile, but also is differential mechanism, main reducing gear and the shell that drives wheel drive.Automobile axle housing quality is very large on the impact of vehicle performance, and axle housing not only needs to possess enough intensity, rigidity and fatigue life, but also should be simple in structure, and cost is lower, and quality is light, is easy to dismounting and maintenance.

Automobile axle housing forming method mainly contains following several, and its pluses and minuses are as follows:

Cast shaping process

Advantage: the easy axle housing of the complex-shaped and wall unevenness of cast form, rigidity, intensity are larger;

Shortcoming: control shaping flow difficulties, easily crack, pore, and weight is large, following process is complicated, and welding sequence easily cracks, is out of shape;

The scope of application: the rear axle housing that is mainly applicable to Medium or severe type truck is produced.

Punching press-welding fabrication technique

Advantage: good manufacturability, percent defective is lower, and reliability is high, easily manufactures, and allowance is little, and quality is light, and precision is high, and price is lower, and product remodeling is convenient, easily realizes the production automation;

Shortcoming: operation is various, the axle housing that is only applicable to simple geometry is produced, and the axle housing intensity that production obtains is lower, and cost is large; Also have welding requirements in addition highly, difficult quality guarantee, easily cracks, the defect of distortion, small opening, and weld zone easy territory fatigue fracture;

The scope of application: the scope of application is wider, is generally used for Light-duty Vehicle, agricultural vehicle.

Expansion is shaped

Advantage: expanding and shaping technique is the derivation of punching press-welding fabrication technique, but its workload minimizing, working (machining) efficiency is high, good airproof performance, the Rigidity and strength of the axle housing obtaining is high, lightweight;

Shortcoming: the place of longitudinally cracking easily produces transversal crack, and Chinese lute bag place flange width is inhomogeneous, and side creases easily and pulls;

The scope of application: be mainly applicable to car, light, medium-duty truck.

Machinery bulging

Advantage: workload reduces, and working (machining) efficiency is high, and the back axle obtaining is lightweight, can higher, the complex-shaped axle housing of production size, and blank utilization rate and production efficiency all higher, the comprehensive mechanical property of back axle is high;

Shortcoming: bulging power is difficult to control, and bulging mechanism and process are complicated, easily crack;

The scope of application: be mainly applicable to passenger car and light medium truck.

Hydraulic expanding-forming

Advantage: stock utilization is high, operation is few, and production efficiency is high, and the axle housing strength and stiffness that obtain are high and lightweight, easily realize production mechanization and automated production;

Shortcoming: technique is still not overripened, high to the requirement of high pressure liquid potential source, easy oil leakage and contaminated environment, expend time in and fund initial stage of investment;

The scope of application: car, light-duty and medium-duty truck.

To sum up, the actual production of axle housing requires to minimize cost, and guarantees its mechanical performance, also will shorten the R&D cycle simultaneously as far as possible, and this just needs the research of new technology, new technology to promote the fast development of axle housing manufacturing process.

For the pluses and minuses of existing automobile axle housing manufacturing process, and in conjunction with China's practical application present situation, the processing and forming technology of existing automobile drive axle rear axle housing mainly contains subject matter and deficiency:

1, the axle housing manufacturing process of China's practical application major part is cast shaping process and punching press-welding fabrication technique, and other forming method is due to technology, economic dispatch reason, applies lessly, or is in the development test stage;

2, the bulging power of mechanical bulging is difficult to control, and bulging mechanism and process are complicated, easily crack, but blank utilization rate, production efficiency, comprehensive mechanical property is high;

3, hydraulic bulging process is still not overripened, high to the requirement of high pressure liquid potential source, easy oil leakage and contaminated environment, and the initial stage expends time in and fund, but the axle housing strength and stiffness that obtain are high, lightweight, easily realize production mechanization and automation.

In view of this, the present invention is intended to explore the whole compound inner high voltage flow-type bulging process of a kind of automobile drive axle, the whole compound inner high voltage flow-type bulging process of this automobile drive axle not only can be realized the bulging of automobile drive axle and produce, and can control preferably the overall process of the continuous bulging of automobile drive axle, the vehicle driving axle housing wall thickness obtaining evenly, dimensional accuracy is higher, weight is less, strength and stiffness are all higher, and there is good fatigue life, can effectively guarantee automobile drive axle assembling, instructions for use.

Summary of the invention

The technical problem to be solved in the present invention is to propose the whole compound inner high voltage flow-type bulging process of a kind of automobile drive axle, the whole compound inner high voltage flow-type bulging process of this automobile drive axle can be controlled the overall process of the continuous bulging of automobile drive axle preferably, can meet the requirement that bulging is produced automobile drive axle.

Realize above-mentioned technical purpose, the whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention, comprises the steps:

1. the whole compound inner high voltage flow-type bulging process of automobile drive axle, is characterized in that: comprise the steps:

1) the axle housing workpiece after opening is put into bulging external mold;

2) bulging internal mold is extend into the bulging deformed area of axle housing workpiece from one end endoporus of axle housing workpiece;

3) bulging external mold matched moulds, and the supporting mechanism of bulging external mold is pressed on the bulging deformed area and the transition face between non-deformation zone of bridge casing lute bag;

4) the multistage high pressure liquid cylinder pressure between upper module and lower module applies the bulging hydraulic coupling perpendicular to axle housing workpiece axial direction to bulging internal mold, and the flow of the hydraulic oil in described multistage high pressure flow formula hydraulic cylinder is 0-10L/min;

5) unload, move back mould.

Further, the described the 4th) in step, two thrust hydraulic cylinders that are positioned at bulging internal mold two ends apply and equate and be parallel to axle housing workpiece axial direction the augmented thrust for preventing that bulging internal mold is offset to bulging internal mold, described augmented thrust is decomposed into and is acted on upper module with on lower module and perpendicular to the augmented thrust vertical stress component and the parallel component of augmented thrust that is parallel to axle housing workpiece axial direction of axle housing workpiece axial direction by linkage, and the bulging power that described axle housing workpiece is subject to is making a concerted effort of described augmented thrust vertical stress component and bulging hydraulic coupling;

In the surrender stage of axle housing workpiece bulging distortion, described augmented thrust vertical stress component monotonic increase, described bulging hydraulic coupling is along with the yield strain rule of axle housing workpiece changes;

In the bulging stage of axle housing workpiece bulging distortion, described bulging hydraulic coupling and the equal monotonic increase of augmented thrust vertical stress component;

In the matched moulds stage of axle housing workpiece bulging distortion, described augmented thrust vertical stress component increases progressively, and described bulging power reaches the rear pressurize of setting value.

Further, axle housing workpiece is in the matched moulds stage pressurize 15-40 second of bulging distortion.

Further, the wall thickness of described axle housing workpiece is 1.5-40mm.

Further, the described the 1st) in step, axle housing workpiece, before putting into bulging external mold, is heated to 200-600 ℃.

Further, described axle housing workpiece is local heat, and the region of heating is the bulging deformed area of axle housing workpiece.

Further, described axle housing workpiece bulging distortion at normal temperatures.

Beneficial effect of the present invention is:

The whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention, utilize multistage high pressure flow formula hydraulic cylinder to apply the bulging hydraulic coupling perpendicular to axle housing workpiece axial direction to upper module and lower module, under the effect of bulging hydraulic coupling, upper module and lower module extruding axle housing workpiece are realized bulging; Owing to directly adopting multistage high pressure flow formula hydraulic cylinder to apply axle housing workpiece bulging, be out of shape required bulging hydraulic coupling, and bulging hydraulic coupling acts directly on upper module and lower module, the bulging that axle housing workpiece is controlled by control bulging hydraulic coupling in direct convenience ground is more out of shape;

By the two ends at bulging internal mold, thrust hydraulic cylinder is set, in the process of bulging, provide augmented thrust, augmented thrust acts on linkage, and act on respectively on upper module and lower module by two hinge bars, make upper module and lower module be subject to the augmented thrust vertical stress component and the parallel component of augmented thrust that is parallel to axle housing workpiece axial direction perpendicular to axle housing workpiece axial direction, the parallel component of augmented thrust can prevent the occurrence positions skew in bulging deformation process of upper module and lower module, the quality of the bridge casing lute bag obtaining after assurance bulging, augmented thrust vertical stress component can be the distortion of axle housing workpiece bulging auxiliary bulging power is provided,

In the bulging production process of automobile drive axle housing, generally need to heat axle housing workpiece, to improve the plastic deformation ability of axle housing workpiece, and reduce axle housing workpiece bulging and be out of shape required bulging power, the temperature of heating is generally 200-600 ℃ of left and right, yet because hydraulic oil at high temperature can go bad, may cause the bulging hydraulic coupling of multistage high pressure flow formula hydraulic cylinder output not enough or unstable, cause bulging to carry out smoothly, the bulging deformation process of uncontrollable axle housing workpiece, the present invention is by adopting multistage high pressure flow formula hydraulic cylinder, not only can provide hydraulic expanding-forming power for the distortion of axle housing workpiece bulging, and hydraulic oil is flowed in the rodless cavity of multistage high pressure flow formula hydraulic cylinder with certain speed, make hydraulic oil be discharged from multistage high pressure flow formula hydraulic cylinder before intensification is rotten, the temperature that guarantees the hydraulic oil in multistage high pressure flow formula hydraulic cylinder maintains lower temperature levels, make the hydraulic expanding-forming power of multistage high pressure flow formula hydraulic cylinder output stablize controlled,

To sum up, the whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention is by controlling the hydraulic coupling of multistage high pressure flow formula hydraulic cylinder, the whole process of axle housing workpiece bulging distortion can be controlled preferably, the requirement that bulging is produced automobile drive axle can be met.

Accompanying drawing explanation

Fig. 1 is the structural representation of whole compound inner high voltage flow-type bulging device the first embodiment of automobile drive axle after workpiece bulging has been out of shape that is applicable to the whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention;

Fig. 2 is the structural representation of the whole compound inner high voltage flow-type bulging device of the automobile drive axle of the present embodiment before the distortion of workpiece bulging;

Fig. 3 is bulging internal model structure schematic diagram;

Fig. 4 is the structural representation of multistage high pressure flow formula hydraulic cylinder;

Fig. 5 is the structural representation of whole compound inner high voltage flow-type bulging device the second embodiment of automobile drive axle after workpiece bulging has been out of shape that is applicable to the whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention;

Fig. 6 is the structural representation of the whole compound inner high voltage flow-type bulging device of the automobile drive axle of the present embodiment before the distortion of workpiece bulging;

Fig. 7 is the Changing Pattern figure of the bulging power in axle housing workpiece bulging deformation process;

Fig. 8 is the Changing Pattern figure of the bulging hydraulic coupling in axle housing workpiece bulging deformation process;

Fig. 9 is the Changing Pattern figure of the augmented thrust vertical stress component in axle housing workpiece bulging deformation process.

Description of reference numerals:

1-bulging internal mold; 1a-upper module; 1b-lower module; 2-bulging external mold; 3-thrust hydraulic cylinder; 4-thrust hydraulic cylinder; 5-axle housing workpiece; 5a-bridge casing lute bag; 5b-transition face; The multistage high pressure flow formula of 6-hydraulic cylinder; 6a-high-pressure piston rod; 6b-high pressure liquid cylinder pressure cylinder body; 6c-rodless cavity; 6d-rod end chamber; 6e-classification oil pocket; 6f-hydraulic fluid port; 6g-inner baffle ring; 6h-outer baffle ring; The 6i-hydraulic fluid port that circulates; The 6j-hydraulic fluid port that circulates; 7-hinge seat; The two hinge bars of 8-; 9-support; 10-support bar; 11-supporting member; 12-hollow tube; The upper external mold of 13-; 13a-upper cavity; 13b-upper cavity supports inwall; External mold under 14-; 14a-lower mode cavity; 14b-lower mode cavity supports inwall.

The specific embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.

First to being applicable to the specific embodiment of the whole compound inner high voltage flow-type bulging device of automobile drive axle of the whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention, describe.

As shown in Figure 1, be whole compound inner high voltage flow-type bulging device the first embodiment of automobile drive axle that is applicable to the whole compound inner high voltage flow-type bulging process of the automobile drive axle of the present invention structural representation after workpiece bulging has been out of shape; Fig. 2 is the structural representation of the whole compound inner high voltage flow-type bulging device of the automobile drive axle of the present embodiment before the distortion of workpiece bulging.

The whole compound inner high voltage flow-type bulging device of the automobile drive axle of the present embodiment, comprises bulging internal mold 1, bulging external mold 2 and lays respectively at bulging internal mold 1 two ends and for thrust hydraulic cylinder 3 and the thrust hydraulic cylinder 4 of auxiliary mold clamping force are provided.

As shown in Figure 3, bulging internal mold 1 comprises upper module 1a and the lower module 1b coordinating with the upper and lower both sides of bridge casing lute bag 5a inwall respectively, between upper module 1a and lower module 1b, be provided with at least one and act on the multistage high pressure flow formula hydraulic cylinder 6 that upper module 1a and lower module 1b went up and provided bulging hydraulic coupling, the two ends of upper module 1a and lower module 1b are articulated and connected by the piston rod of linkage and thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 respectively, as shown in Figure 1, the thrust hydraulic cylinder 3 of the present embodiment is positioned at the left side of bulging internal mold 1, thrust hydraulic cylinder 4 is positioned at the right side of bulging internal mold 1.Preferably, linkage comprises the hinge seat 7 being fixedly mounted on thrust hydraulic cylinder piston rod, between hinge seat 7 and upper module 1a and lower module 1b, by two hinge bars 8, be articulated and connected respectively, adopt the linkage of this structure, between two hinge bars 8 and the piston rod of thrust hydraulic cylinder, there is angle, the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 can be decomposed into to act on upper module 1a and lower module 1b upper and perpendicular to the augmented thrust vertical stress component and the parallel component of augmented thrust that is parallel to axle housing workpiece axial direction of axle housing workpiece axial direction, and be accompanied by the increase of axle housing workpiece bulging deflection, two hinge bars 8 of linkage and the angle between thrust hydraulic cylinder piston rod increase, can increase augmented thrust vertical stress component.

Bulging external mold 2 comprises for pushing down at the bulging deformed area of bridge casing lute bag 5a and the supporting mechanism of the transition face 5b between non-deformation zone.As depicted in figs. 1 and 2, the bulging external mold 2 of the present embodiment also comprises support 9, supporting mechanism comprises the support bar 10 being arranged on support 9 and is arranged on the supporting member 11 on support bar 10, the supporting member 11 of the present embodiment is set to 4, and lays respectively at the both sides up and down of the two ends transition face 5b of bridge casing lute bag 5a.It is upper that supporting member 11 is pressed in transition face 5b, by adopting the bulging external mold 2 of this structure, by supporting member 11, pushes down transition face 5b, can control bridge casing lute bag 5a at the deformed region of bulging deformation process, prevents other region deformations of workpiece.Preferably, supporting member 11 is the curved surface coordinating with transition face 5b with the contact-making surface of axle housing workpiece 5, can prevent that transition face 5b is because distortion produces fold.

The piston rod of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 arranges in opposite directions, the axis of two-piston bar is located on the same line, and the piston rod of one of them thrust hydraulic cylinder is provided with quick-detachment syndeton, the quick-detachment syndeton of the present embodiment is arranged on the piston rod of thrust hydraulic cylinder 4.By quick-detachment syndeton is set, the piston rod of thrust hydraulic cylinder 4 and bulging internal mold 1, thrust hydraulic cylinder 3 can be separated, be convenient to before bulging, bulging internal mold 1 is positioned in the endoporus of axle housing workpiece 5.

As shown in Figure 4, multistage high pressure flow formula hydraulic cylinder 6 comprises high-pressure piston rod 6a and the stacked high pressure liquid cylinder pressure cylinder body 6b that is set in together and is stretching structure of two-stage at least, high-pressure piston rod 6a is sleeved on the high pressure liquid cylinder pressure cylinder body 6b of innermost layer, between outermost high pressure liquid cylinder pressure cylinder body 6b and high-pressure piston rod 6a, form rodless cavity 6c, between the high pressure liquid cylinder pressure cylinder body 6b of innermost layer and high-pressure piston rod 6a, form rod end chamber 6d, between adjacent two-stage hydraulic cylinder body 6b, form classification oil pocket 6e, rod end chamber 6d is equipped with on classification oil pocket 6e the hydraulic fluid port 6f being connected with hydraulic power source, rodless cavity 6c is provided with for the circulation hydraulic fluid port 6i of hydraulic oil circulation and circulation hydraulic fluid port 6j.As shown in Figure 1, the multistage high pressure flow formula hydraulic cylinder 6 of the present embodiment is set to 2, wherein between the outermost layer high pressure liquid cylinder pressure cylinder body 6b of multistage high pressure flow formula hydraulic cylinder 6 and lower module 1b, be threaded connection structure and be fixedly connected with, high-pressure piston rod 6a is fixedly mounted on upper module 1a by threaded fastener; Between the outermost layer high pressure liquid cylinder pressure cylinder body 6b of another multistage high pressure flow formula hydraulic cylinder 6 and upper module 1a, be threaded connection structure and be fixedly connected with, high-pressure piston rod 6a is fixedly mounted on lower module 1b by threaded fastener.The multistage high pressure flow formula hydraulic cylinder 6 of the present embodiment comprises three grades of stacked high pressure liquid cylinder pressure cylinder body 6b that are set in together and are stretching structure.

Adopt the multistage high pressure flow formula hydraulic cylinder 6 of this structure, at piston rod 6a, outwards provide in the process of hydraulic thrust, rodless cavity 6c provides the hydraulic oil of circulation, and rod end chamber 6d and the equal oil return of classification oil pocket 6e can realize multistage high pressure flow formula hydraulic cylinder 6 elongations and hydraulic coupling is outwards provided; In like manner, when piston rod 6a bounces back, rodless cavity 6c oil return, rod end chamber 6d and the equal oil-feed of classification oil pocket 6e, can realize piston rod 6a retraction.

The whole compound inner high voltage flow-type bulging device of automobile drive axle of the present embodiment before use, first the quick-detachment syndeton being arranged on thrust hydraulic cylinder 4 piston rods is separated, bulging internal mold 1 is placed in axle housing workpiece 5, and then these thrust hydraulic cylinder 4 piston rods are connected by quick-detachment syndeton, carry out the preparation of axle housing workpiece 5 bulging distortion.

By being arranged on the multistage high pressure flow formula hydraulic cylinder 6 between upper module 1a and lower module 1b, multistage high pressure flow formula hydraulic cylinder 6 provides bulging hydraulic coupling to upper module 1a and lower module 1b, upper module 1a and lower module 1b separate both sides Shang Xia 5 to axle housing workpiece respectively, extruding axle housing workpiece 5, realizes bulging.By the two ends at bulging internal mold 1, thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 are set, in the process of bulging, provide augmented thrust, augmented thrust is decomposed into and acts on upper module 1a with on lower module 1b and the augmented thrust vertical stress component vertical with axle housing workpiece 5 axial directions and the augmented thrust parallel component parallel with axle housing workpiece 5 axial directions under the effect of linkage, the parallel component of augmented thrust can prevent upper module 1a and lower module 1b occurrence positions skew in Bulging Process, the quality of the bridge casing lute bag 5a obtaining after assurance bulging.By bulging external mold 2 is set, can accurately control the position of axle housing workpiece 5 bulging distortion, control axle housing workpiece 5 and at transition face 5b place, start bulging distortion, so just can realize the bulging of bridge casing lute bag.

Because the diameter of bore of the axle housing workpiece 5 for the production of automobile drive axle housing is generally all less, and bridge casing lute bag 5a is larger to the distortion ratio of both sides bulging distortion, traditional hydraulic cylinder not only cannot meet the requirement of installing and using in little space, and cannot provide and meet the required hydraulic coupling stroke of deflection.The multistage high pressure flow formula hydraulic cylinder 6 of the present embodiment, by high pressure liquid cylinder pressure cylinder body 6b, be set to stacked be set in together at least two-layer mutually, not only can effectively dwindle required space is installed, and form stretching structure between high pressure liquid cylinder pressure cylinder body 6b, by elongation and the shortening of high pressure liquid cylinder pressure cylinder body 6b, the hydraulic coupling stroke that can effectively improve multistage high pressure flow formula hydraulic cylinder 6, can meet instructions for use.

In the bulging production process of automobile drive axle housing, generally need to heat axle housing workpiece 5, to improve the plastic deformation ability of axle housing workpiece 5, and reduce axle housing workpiece 5 bulgings and be out of shape required bulging power, the temperature of heating is generally 200-600 ℃ of left and right, yet because hydraulic oil at high temperature can go bad, may cause the bulging hydraulic coupling of multistage high pressure flow formula hydraulic cylinder 6 outputs not enough or unstable, cause bulging to carry out, the multistage high pressure flow formula hydraulic cylinder 6 of the present embodiment by being provided for two circulation hydraulic fluid ports of hydraulic oil circulation in rodless cavity 6c, high pressure liquid force feed enters rodless cavity 6c from one of them circulation hydraulic fluid port, and flow out rodless cavity 6c from another circulation hydraulic fluid port, when required hydraulic coupling is provided, make hydraulic oil keep the circulation of given pace, prevent analysis of hydraulic oil overheat.

By the two ends of upper module 1a and lower module 1b are hinged by the piston rod of linkage and thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 respectively, thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 can synchronously provide augmented thrust to bulging internal mold 1 opposite to each other, under the effect of linkage, the augmented thrust of augmented thrust hydraulic cylinder is decomposed into to act on upper module 1a and lower module 1b upper and perpendicular to the augmented thrust vertical stress component and the parallel component of augmented thrust that is parallel to axle housing workpiece axial direction of axle housing workpiece axial direction, and under the effect of the bulging hydraulic coupling of multistage high pressure flow formula hydraulic cylinder 6, upper module 1a and lower module 1b separate both sides Shang Xia 5 to axle housing workpiece respectively, extruding axle housing workpiece 5, realize bulging.By bulging external mold 2 is set, can accurately control the position of axle housing workpiece 5 bulging distortion, control axle housing workpiece 5 and at transition face place, start bulging distortion, so just can realize the bulging of bridge casing lute bag 5a.

As the above-mentioned technical solutions of this embodiment preferably, logical centre bore during the piston rod that the thrust hydraulic cylinder of quick-detachment syndeton is not set is provided with, and on the cylinder body of this thrust hydraulic cylinder with on the hinge seat 7 being connected with this thrust hydraulic cylinder, be equipped with the through hole coaxial with centre bore, in centre bore and through hole, be provided with for the hollow tube 12 of the hydraulic oil pipe between hydraulic fluid port 6f and hydraulic power source and between circulation hydraulic fluid port and hydraulic power source is installed.As depicted in figs. 1 and 2, the centre bore of the present embodiment is arranged on the piston rod of thrust hydraulic cylinder 3, accordingly, the cylinder body of thrust hydraulic cylinder 3 is provided with through hole with the hinge seat 7 being connected with thrust hydraulic cylinder 3, hollow tube 12 extends through centre bore and through hole, and the hydraulic oil pipe between hydraulic fluid port 6f and hydraulic power source is arranged in hollow tube 12.Because the internal diameter of axle housing workpiece 5 is less, in structures such as the piston rod of thrust hydraulic cylinder and linkages, occupy behind a large amount of spaces, the arrangement space of the hydraulic oil pipe between hydraulic fluid port 6f and hydraulic power source is not enough, by setting, extend through the hollow tube of thrust hydraulic cylinder 3 and hinge seat 7, can realize hydraulic oil pipe is arranged in hollow tube 12, and provide high pressure liquid force feed for multistage high pressure flow formula hydraulic cylinder 6.

As the above-mentioned technical solutions of this embodiment preferably, between adjacent two-stage hydraulic cylinder body 6b and between high-pressure piston rod 6a and innermost layer hydraulic cylinder body 6b, the top that is positioned at outer field hydraulic cylinder body 6b is provided with the inner baffle ring 6g extending radially inwardly, the bottom that is positioned at the hydraulic cylinder body 6b/ high-pressure piston rod 6a of internal layer is provided with the outer baffle ring 6h extending radially outwardly and coordinate with inner baffle ring 6g, between the periphery wall of inner baffle ring 6g and internal layer hydraulic cylinder body, be provided with hermetically-sealed construction, between outer baffle ring 6h and the internal perisporium of outer hydraulic cylinder body, be provided with hermetically-sealed construction.The multistage high pressure flow formula hydraulic cylinder 6 that adopts this structure, forms position-limit mechanism between inner baffle ring 6g and outer baffle ring 6h, prevents from departing between adjacent two-stage hydraulic cylinder body 6b and innermost layer hydraulic cylinder body 6b and high-pressure piston rod 6a.Preferably, hydraulic fluid port 6f is arranged on inner baffle ring 6g, prevent that multistage high pressure flow formula hydraulic cylinder 6 is in telescopic process, between hydraulic cylinder body 6b and hydraulic fluid port 6f, interfere, the circulation hydraulic fluid port 6i and the circulation hydraulic fluid port 6j that are arranged on described rodless cavity 6c are separately positioned on outermost layer hydraulic cylinder body 6b bottom and high-pressure piston rod 6a, by circulation hydraulic fluid port 6i and circulation hydraulic fluid port 6j are separately positioned on to outermost layer hydraulic cylinder body 6b bottom and high-pressure piston rod 6a, can improve the trafficability performance of hydraulic oil, prevent that in rodless cavity 6c, hydraulic oil local temperature is too high.

The second embodiment

As shown in Figure 5, be whole compound inner high voltage flow-type bulging device the second embodiment of automobile drive axle that is applicable to the whole compound inner high voltage flow-type bulging process of the automobile drive axle of the present invention structural representation after workpiece bulging has been out of shape; Fig. 6 is the structural representation of the whole compound inner high voltage flow-type bulging device of the automobile drive axle of the present embodiment before the distortion of workpiece bulging.

The bulging external mold 2 of the present embodiment comprises external mold 13 and lower external mold 14, upper external mold 13 with on lower external mold 14, be respectively equipped with upper cavity 13a and the lower mode cavity 14a identical with the upper and lower both sides of bridge casing lute bag 5a outer wall shape and structure, supporting mechanism be upper cavity 13a and lower mode cavity 14a respectively the upper cavity corresponding with bridge casing lute bag 5a transition face 5b support inwall 13b and lower mode cavity supports inwall 14b, adopt the bulging external mold 2 of this structure, not only can effectively control the deformed region of axle housing workpiece 5 in Bulging Process, but also can better control the contour structures of the bridge casing lute bag 5a after bulging.Preferably, when upper external mold 13 and lower external mold 14 are closed, upper cavity 13a forms the bulging chamber identical with the outer wall shape and structure of bridge casing lute bag 5a with lower mode cavity 14a, adopt the bulging external mold 2 of this structure, employing will be carried out bulging after upper external mold 13 and lower external mold 14 closures, be convenient to location between external mold 13 and lower external mold 14, be more convenient for applying mold clamping force to bulging external mold 2.

The multistage high pressure flow formula hydraulic cylinder 6 of the present embodiment is set to 1, but those skilled in the art should know, multistage high pressure flow formula hydraulic cylinder 6 also can be arranged side by side according to actual needs as two or more, and its principle is identical with the multistage high pressure flow formula hydraulic cylinder 6 that is set to one or two.

Other structures of the present embodiment are identical with the first embodiment, no longer one by one tired stating.

Below the specific embodiment of the whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention is elaborated.

The whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention, comprises the steps:

1) the axle housing workpiece 5 after opening is put into bulging external mold 2;

2) bulging internal mold 1 is extend into the bulging deformed area of axle housing workpiece 5 from one end endoporus of axle housing workpiece 5, in actual mechanical process, first the piston rod of a thrust hydraulic cylinder 4 is disconnected by quick-detachment syndeton, and multistage high pressure flow formula hydraulic cylinder 6 is shunk completely, by bulging internal mold 1 with from the endoporus of another thrust hydraulic cylinder 3 one end, extend in axle housing workpiece, recycling quick-detachment syndeton connects the piston rod of thrust hydraulic cylinder 4 fast;

3) bulging external mold 2 matched moulds, and the supporting mechanism of bulging external mold 2 is pressed on the bulging deformed area and the transition face 5b between non-deformation zone of bridge casing lute bag 5a, by supporting mechanism being set on bulging adventitia 2, can control the bulging distortion of axle housing workpiece 5, the bulging deformed area of axle housing workpiece 5 is between the transition face 5b at two ends;

4) the multistage high pressure liquid cylinder pressure between upper module and lower module applies the bulging hydraulic coupling perpendicular to axle housing workpiece axial direction to bulging internal mold, and the flow of the hydraulic oil in described multistage high pressure flow formula hydraulic cylinder is 10L/min.

5) unloading, moves back mould.

Preferably, the described the 4th) in step, the thrust hydraulic cylinder 3 and the thrust hydraulic cylinder 4 that are positioned at bulging internal mold 1 two ends apply the augmented thrust that equates and be parallel to axle housing workpiece 5 axial directions to bulging internal mold, augmented thrust is decomposed into by linkage that to act on upper module 1a and lower module 1b upper and perpendicular to the augmented thrust vertical stress component and the parallel component of augmented thrust that is parallel to axle housing workpiece axial direction of axle housing workpiece 5 axial directions, the bulging power that axle housing workpiece is subject to be augmented thrust vertical stress component and bulging hydraulic coupling with joint efforts;

As Figure 7-9,0-t1 is the axle housing workpiece strain stage, the t1-t2 time period is the surrender stage of axle housing workpiece 5 bulging distortion, the t2-t3 time period is the bulging stage in the 5 bulging distortion of axle housing workpiece, the t3-t4 time period is the bulging stage of axle housing workpiece 5 bulging distortion, and t4-t5 is the unloading phase after axle housing workpiece bulging has been out of shape.

In the surrender stage of axle housing workpiece 5 bulging distortion, augmented thrust vertical stress component monotonic increase, bulging hydraulic coupling is along with the yield strain rule of axle housing workpiece 5 changes;

In the bulging stage of axle housing workpiece 5 bulging distortion, bulging hydraulic coupling and the equal monotonic increase of augmented thrust vertical stress component;

In the matched moulds stage of axle housing workpiece 5 bulging distortion, augmented thrust vertical stress component increases progressively, and bulging power reaches the rear pressurize of setting value.

Preferably, axle housing workpiece 5 is after bulging has been out of shape, and pressurize 15～40 seconds, by pressurize, can prevent that axle housing workpiece 5 from deforming after moving back mould under internal stress effect, guarantees product quality.

The whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention, utilize multistage high pressure flow formula hydraulic cylinder 6 to apply the bulging hydraulic coupling perpendicular to axle housing workpiece 5 axial directions to upper module 1a and lower module 1b, under the effect of bulging hydraulic coupling, upper module 1a and lower module 1b extruding axle housing workpiece 5 are realized bulging.Owing to directly adopting multistage high pressure flow formula hydraulic cylinder 6 to apply axle housing workpiece 5 bulgings, be out of shape required bulging hydraulic coupling, and bulging hydraulic coupling acts directly on upper module 1a and lower module 1b is upper, the bulging that axle housing workpiece 5 is controlled by control bulging hydraulic coupling in direct convenience ground is more out of shape.

By the two ends at bulging internal mold 1, thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 are set, in the process of bulging, provide augmented thrust, augmented thrust acts on linkage, and act on respectively on upper module 1a and lower module 1b by two hinge bars 8, make upper module 1a and lower module 1b be subject to the augmented thrust vertical stress component and the parallel component of augmented thrust that is parallel to axle housing workpiece 5 axial directions perpendicular to axle housing workpiece 5 axial directions, the parallel component of augmented thrust can prevent upper module 1a and lower module 1b occurrence positions skew in bulging deformation process, the quality of the bridge casing lute bag 5a obtaining after assurance bulging, augmented thrust vertical stress component can be the 5 bulging distortion of axle housing workpiece auxiliary bulging power is provided.

From geometrical relationship, the pass of augmented thrust T and augmented thrust vertical stress component T1 is:

T ₁＝Ttanθ/2

In formula, θ is the angle of two hinge bars 8 and axle housing workpiece 5 axial directions.

In the bulging production process of automobile drive axle housing, generally need to heat axle housing workpiece 5, to improve the plastic deformation ability of axle housing workpiece 5, and reduce axle housing workpiece 5 bulgings and be out of shape required bulging power, the temperature of heating is generally 200-600 ℃ of left and right, yet because hydraulic oil at high temperature can go bad, may cause the bulging hydraulic coupling of multistage high pressure flow formula hydraulic cylinder 6 outputs not enough or unstable, cause bulging to carry out smoothly, the bulging deformation process of uncontrollable axle housing workpiece 5, the present invention is by adopting multistage high pressure flow formula hydraulic cylinder 6, not only can provide hydraulic expanding-forming power for the 5 bulging distortion of axle housing workpiece, and hydraulic oil is flowed in the rodless cavity 6c of multistage high pressure flow formula hydraulic cylinder 6 with certain speed, make hydraulic oil be discharged from multistage high pressure flow formula hydraulic cylinder 6 before intensification is rotten, the temperature that guarantees the hydraulic oil in multistage high pressure flow formula hydraulic cylinder 6 maintains lower temperature levels, make the hydraulic expanding-forming power of multistage high pressure flow formula hydraulic cylinder 6 outputs stablize controlled,

To sum up, the whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention is by controlling the hydraulic coupling of multistage high pressure flow formula hydraulic cylinder 6, the whole process that can control preferably the 5 bulging distortion of axle housing workpiece, can meet the requirement that bulging is produced automobile drive axle.

Further, the wall thickness of axle housing workpiece 5 is generally 1.5-40mm, and axle housing workpiece 5 carries out bulging distortion in two ways can adopt, and is respectively heat expansion shape mode and cold expanding shape mode.

Heat expansion shape mode is: axle housing workpiece 5, before putting into bulging external mold 2, is heated to 200-600 ℃, by heating, can improve the plastic deformation ability of axle housing workpiece 5, makes axle housing workpiece 5 bulgings be out of shape required bulging power less, saves cost of investment.Preferably, axle housing workpiece 5 is local heat, and the region of heating is the bulging deformed area of axle housing workpiece 5, and the present embodiment adopts Frequency Induction Heating mode to heat axle housing workpiece 5, adopts local heat mode, can save the energy.

Cold expanding shape mode is: axle housing workpiece 5 bulging distortion at normal temperatures.

Adopt heat expansion shape mode and cold expanding shape mode all can realize the bulging distortion of axle housing workpiece 5, still due under cold expanding shape mode, axle housing workpiece 5 is normal temperature, and its plastic deformation ability is poor, and under equal conditions the force rate heat expansion shape mode of required bulging distortion is large.

Below by specific embodiment, the embodiment of the whole compound inner high voltage flow-type bulging process of automobile drive axle of the present invention is elaborated.

The 1st embodiment

The wall thickness of the axle housing workpiece 5 of the present embodiment is 1.5mm, and the technological parameter of its concrete bulging distortion is as follows:

1, heat expansion shape mode:

1) axle housing workpiece 5 is heated to 600 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 5L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 2000～2200KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 0KN, and the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b equates with bulging power;

In the bulging stage of axle housing workpiece 5 distortion, it is 900～1600KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 0KN, and the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b equates with bulging power;

In the matched moulds stage of axle housing workpiece 5 distortion, after the required bulging power of axle housing workpiece 5 increases progressively gradually and is 2800～3000KN, pressurize 15s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 0KN, and the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b equates with bulging power.

Be that axle housing workpiece 5 bulgings are out of shape required bulging power and all by multistage high pressure liquid cylinder pressure, are provided, 4 pairs of bulging internal molds of thrust hydraulic cylinder 3 and thrust hydraulic cylinder do not produce active force.

2) axle housing workpiece 5 is heated to 400 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 10L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 2300～2500 and along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 0KN, and the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b equates with bulging power;

In the bulging stage of axle housing workpiece 5 distortion, it is 1000～1800KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 0KN, and the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b equates with bulging power;

In the matched moulds stage of axle housing workpiece 5 distortion, after the required bulging power of axle housing workpiece 5 increases progressively gradually and is 3000～3200KN, pressurize 30s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 0KN, and the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b equates with bulging power.

3) axle housing workpiece 5 is heated to 200 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 7L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 3200～3500 and along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 0KN, and the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b equates with bulging power;

In the bulging stage of axle housing workpiece 5 distortion, it is 2000～2800KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 1000KN, it is 1150～2700KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, after the required bulging power of axle housing workpiece 5 increases progressively gradually and is 4100～4300KN, pressurize 40s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 2000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, and the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 2400～2650KN.

2, cold expanding shape mode, the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 0L/min, now hydraulic oil does not flow:

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 5800～6100KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 5500～5850KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 5000～5600KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 2500～5300KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 6300～6500KN gradually, pressurize 35s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 3700～4000KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

The 2nd embodiment

The wall thickness of the axle housing workpiece 5 of the present embodiment is 8mm, and the technological parameter of its concrete bulging distortion is as follows:

1, heat expansion shape mode:

1) axle housing workpiece 5 is heated to 600 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 3L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 7950～8100KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 7600～7850KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 6000～7500KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 3500～7250KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 8250～8500KN gradually, pressurize 25s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 5700～6000KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

2) axle housing workpiece 5 is heated to 400 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 6L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 9250～9500KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 9000～9200KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 7700～9000KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 5200～8700KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 9800～10000KN gradually, pressurize 40s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 7250～7500KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

3) axle housing workpiece 5 is heated to 200 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 8L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 15000～15500KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 14700～15300KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 13000～14500KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 10400～14300KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 17000～17800KN gradually, pressurize 35s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 5000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 12800～13600KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

2, cold expanding shape mode, the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 1L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 32500～33000KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 32200～32800KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 29500～31500KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 27000～31200KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 34000～35000KN gradually, pressurize 30s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 5000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 29800～30800KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

The 3rd embodiment

The wall thickness of the axle housing workpiece 5 of the present embodiment is 16mm, and the technological parameter of its concrete bulging distortion is as follows:

1, heat expansion shape mode:

1) axle housing workpiece 5 is heated to 600 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 4L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 15900～16200KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 15600～16000KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 12000～15000KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 9450～14800KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 16500～17000KN gradually, pressurize 15s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 13900～14500KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

2) axle housing workpiece 5 is heated to 400 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 7L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 18500～19000KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 18200～18700KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 15400～18000KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 12800～17800KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 19600～20000KN gradually, pressurize 25s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 4000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 16200～16600KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

3) axle housing workpiece 5 is heated to 200 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 9L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 30000～31000KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 29700～30800KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 26000～29000KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 23400～28800KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 34000～35600KN gradually, pressurize 18s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 8000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 27200～28900KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

2, cold expanding shape mode, the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 0.5L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 65000～66000KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 64700～65800KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 59000～63000KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 56400～62800KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 68000～70000KN gradually, pressurize 36s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 8000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 61200～63300KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

The automobile drive axle integral body of the present embodiment meets hydroforming technique and also can only adopt multistage high pressure liquid cylinder pressure to apply bulging power to bulging internal mold, now bulging hydraulic coupling equals the required bulging power of axle housing workpiece, the Changing Pattern that is bulging hydraulic coupling is identical with the Changing Pattern of bulging power, is not tiring out and is stating one by one.

The 4th embodiment

The wall thickness of the axle housing workpiece 5 of the present embodiment is 25mm, and the technological parameter of its concrete bulging distortion is as follows:

1, heat expansion shape mode:

1) axle housing workpiece 5 is heated to 600 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 8L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 24800～25300KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 24500～25000KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 18700～23400KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 16200～23200KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 25700～26600KN gradually, pressurize 28s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 23200～24000KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 28900～29700KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 28600～29500KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 24000～28200KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 21500～27900KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 30600～31300KN gradually, pressurize 32s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 4000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 27200～27900KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

3) axle housing workpiece 5 is heated to 200 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 4L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 46800～48400KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 46600～48200KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 40600～45300KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 38100～45000KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 53100～55600KN gradually, pressurize 40s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 10000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 44700～47200KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

2, cold expanding shape mode, the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 2L/min:

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 101500～103100KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 101300～102800KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 92200～98500KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 89600～98200KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to pressurize 32s after 106200～109400KN gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 10000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 97800～100000KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

The 5th embodiment

The wall thickness of the axle housing workpiece 5 of the present embodiment is 40mm, and the technological parameter of its concrete bulging distortion is as follows:

1, heat expansion shape mode:

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 39700～40500KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 39400～40200KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 30000～37500KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 27400～37200KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 41200～42500KN gradually, pressurize 38s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 4000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 37800～39200KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

2) axle housing workpiece 5 is heated to 400 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 5L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 46200～47500KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 45900～47200KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 38500～45000KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 35900～44800KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 49000～50000KN gradually, pressurize 40s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 4000KN, augmented thrust vertical stress component T1=Ttan0/2 also increases gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 45600～46600KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

3) axle housing workpiece 5 is heated to 200 ℃ when bulging is out of shape, and the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 6L/min;

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 75000～77500KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 74700～77200KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 65000～72500KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 62400～72200KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 85000～89000KN gradually, pressurize 35s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 12000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 74900～78900KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

2, cold expanding shape mode, the flow of the hydraulic oil in multistage high pressure flow formula hydraulic cylinder is 8L/min:

In the surrender stage of axle housing workpiece 5 distortion, the maximum of the bulging power that axle housing workpiece is required is 162500～165000KN along with axle housing workpiece yield strain regular fluctuation, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, and the maximum of the bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b is 162200～164800KN along with axle housing workpiece yield strain regular fluctuation;

In the bulging stage of axle housing workpiece 5 distortion, it is 147500～157500KN that the required bulging power of axle housing workpiece 5 increases progressively gradually, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 3000KN, it is 144900～157200KN that bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b increases progressively gradually, and augmented thrust vertical stress component T1=Ttan θ/2, because the bulging distortion along with axle housing workpiece 5 of the angle theta of two hinge bars 8 and axle housing workpiece 5 axial directions increases gradually, augmented thrust vertical stress component T1 is in 5 bulging stage of axle housing workpiece monotonic increase, ,

In the matched moulds stage of axle housing workpiece 5 distortion, the required bulging power of axle housing workpiece 5 is incremented to after 170000KN gradually, pressurize 40s, wherein the augmented thrust of thrust hydraulic cylinder 3 and thrust hydraulic cylinder 4 is 12000KN, augmented thrust vertical stress component T1=Ttan θ/2 also increase gradually, bulging hydraulic coupling under the effect of multistage high pressure liquid cylinder pressure on upper module 1a and lower module 1b gradually changes to pressurize after 159900～164900KN, in pressure maintaining period, the size of θ is constant, and augmented thrust vertical stress component also keeps constant.

Claims

1) the axle housing workpiece after opening is put into bulging external mold;

4) the multistage high pressure flow formula hydraulic cylinder between upper module and lower module applies the bulging hydraulic coupling perpendicular to axle housing workpiece axial direction to bulging internal mold, and the flow of the hydraulic oil in described multistage high pressure flow formula hydraulic cylinder is 0～10L/min;

5) unload, move back mould.

2. the whole compound inner high voltage flow-type bulging process of automobile drive axle according to claim 1, it is characterized in that: the described the 4th) in step, be positioned at the thrust hydraulic cylinder at bulging internal mold two ends, respectively there is a thrust hydraulic cylinder one end, to bulging internal mold, apply and equate and be parallel to axle housing workpiece axial direction the augmented thrust for preventing that bulging internal mold is offset, described augmented thrust is decomposed into and is acted on upper module with on lower module and perpendicular to the augmented thrust vertical stress component and the parallel component of augmented thrust that is parallel to axle housing workpiece axial direction of axle housing workpiece axial direction by linkage, the bulging power that described axle housing workpiece is subject to is making a concerted effort of described augmented thrust vertical stress component and bulging hydraulic coupling,

3. the whole compound inner high voltage flow-type bulging process of automobile drive axle according to claim 2, is characterized in that: axle housing workpiece is in the matched moulds stage pressurize 15-40 second of bulging distortion.

4. the whole compound inner high voltage flow-type bulging process of automobile drive axle according to claim 3, is characterized in that: the wall thickness of described axle housing workpiece is 1.5-40mm.

5. the whole compound inner high voltage flow-type bulging process of automobile drive axle according to claim 4, is characterized in that: the described the 1st), in step, axle housing workpiece, before putting into bulging external mold, is heated to 200-600 ℃.

6. the whole compound inner high voltage flow-type bulging process of automobile drive axle according to claim 5, is characterized in that: described axle housing workpiece is local heat, and the region of heating is the bulging deformed area of axle housing workpiece.

7. the whole compound inner high voltage flow-type bulging process of automobile drive axle according to claim 3, is characterized in that: the bulging distortion at normal temperatures of described axle housing workpiece.