CN101716643A

CN101716643A - Double-side molding process and die of wheel hub bearing outer ring

Info

Publication number: CN101716643A
Application number: CN200910259066A
Authority: CN
Inventors: 石磊
Original assignee: HUANGSHI HATEBUR PRECISE FORGING Co Ltd
Current assignee: HUANGSHI HATEBUR PRECISE FORGING Co Ltd
Priority date: 2009-12-08
Filing date: 2009-12-08
Publication date: 2010-06-02
Anticipated expiration: 2029-12-08
Also published as: CN101716643B

Abstract

The invention relates to a double-side molding process and a die of a wheel hub bearing outer ring, which comprises the following process steps: 1) charging; 2) upsetting; 3) performing; and 4) forming. The forging die comprises a die case, a mobile female die, a die core, a lifting sleeve, a top pin and a female die pad, wherein the mobile female die and the die case are in clearance fit; the die core is fixed in the die case to cooperate with the mobile female die and a punching head to perform forming; the lifting sleeve is arranged between the mobile female die and the die core; the top pin is arranged in the female die pad; the top pin and the female die pad are in clearance fit; and the female die pad is fixed in a machine tool. Compared with the prior art, the process has the advantages of making a forged metal flow line and the working method of a track of finished bearings consistent to a maximum degree, making great contribution to the prolonging of the service life of bearings, solving a common local underfill problem of hot direct extrusion and representing a design mode breaking common rules.

Description

Wheel hub bearing outer ring double-side molding process and mould thereof

Technical field

The present invention relates to a kind of wheel hub bearing outer ring double-side molding process and mould of making on the high speed upsetter thereof that be applicable to.

Technical background

Wheel hub bearing is the important walking parts of automobile.This bearing is being undertaken the frictional resistance when reducing the chassis running, keeps the important task of automobile normal running.If hub bearing is out of order, may cause that the phenomenon, particularly front-wheel of noise, bearing heating etc. is more obvious, cause dangerous phenomenons such as direction out of control easily.Therefore life-span and the reliability to bearing has strict requirement.

Bearing mainly is made up of inner ring, steel ball, seal, outer ring.The inner ring role is: support, transmit moment of torsion, quantity is 2; The outer ring role is: be assemblied in the wheel hub, connect forward wheel components and front-wheel and rotate together, quantity is 1; The steel ball role is: bearing load, quantity are a plurality of; The seal role is: sealing, prevent that grease leakage and introduced contaminants, moisture from entering bearing, and quantity is 2.

Because of this bearing outer ring and front-wheel rotate jointly, add the road conditions instability, condition of work is abominable, occurs on the outer ring so the majority of bearing loses efficacy.Its inefficacy cause often is not caused by bearing material problem or sealing problem, failure mode mostly is channel surface starting point type and peels off, blocking appears in many by analysis fibre flows because of the raceway position, block the place that the position fibre flow appears at this and begin to take place fatigue flake at first, and then develop into whole raceway, cause the degradation failure of bearing function.

Obtaining the importance of perfect fibre flow in Forging Technology has been the common understanding of industry, the forging of particularly important component of machine.Therefore to greatest extent fibre flow being molded into parallel with the raceway method of work is the key issue place of improving bearing life.

How designing Forging Technology is first problem that the technical staff will solve; How to realize on hot headers that this technology is second problem that faces, just forging molding mould design problem.

Traditional process as shown in Figure 1, includes blanking, jumping-up, moulding, punching at present; Also have another kind of process, as shown in Figure 2, include blanking, jumping-up, moulding, punching, cold rolling expansion.A kind of method in back that is not both of these two kinds of processes significantly save material, but process route is longer slightly by increasing cold rolling technology.The common ground of two kinds of processes is all to be one-sided extruding in molding procedure, promptly adopts hot backward extrusion mode to carry out blank forming.The metal streamline of final products is all undesirable.First kind of technology mode is the poorest, its shortcoming is that stock utilization is low, the streamline at two raceway places is all blocked, second kind of technology mode is better than first kind slightly, one side makes moderate progress through cold rolling, but opposite side still is bad, so these two kinds of technologies all can not obtain best streamline and best stock utilization.

Summary of the invention

Technical problem to be solved by this invention is at above-mentioned existing a kind of wheel hub bearing outer ring double-side molding process of making on the high speed upsetter that is applicable to that provides, this technology can mold the fibre flow parallel with raceway to greatest extent, has improved bearing life greatly.

Another object of the present invention provides the special-purpose forging mold of this process using.

The present invention is adopted solution to be by the problem of the above-mentioned proposition of solution: the wheel hub bearing outer ring double-side molding process includes following processing step: 1) blanking; 2) jumping-up; 3) preformed; 4) moulding; Wherein during step 3) preformed, at first die sleeve is fixed on the lathe, the machine startup back punching head moves back and forth, to expect that cake delivers to the preformed station with on the forging mold, drift begins punching press material cake, after drift will expect that cake is pressed into mobile die, the outer step of drift begins to contact with mobile die, at this moment, drift forces mobile die to move downward simultaneously, will expect that cake carries out preformed, runs to after bottom dead center, the drift rollback is ejected from mobile die and core rod by the blank that it is good with preformed that ejector pin pushes the liftout cover then.

Press such scheme, the described blanking of step 1) is according to fabricated part size design forging drawing, can obtain the forging volume of moulding when abundant behind the thickness of design honest material core, and then calculate bar diameter and length, and wherein the bar draw ratio is 0.8-1.2.

The forging mold that above-mentioned preforming process adopts includes die sleeve, mobile die, core rod, liftout cover, ejector pin and die supporter, and wherein mobile die and die sleeve are matched in clearance, and mobile die can carry out moving of a segment distance in die sleeve; Core rod is fixed in the die sleeve, cooperates mobile die, drift to carry out moulding; Liftout is set between mobile die and the core rod, is matched in clearance with them, is responsible for liftout work; Ejector pin is arranged in the die supporter, and ejector pin and die supporter are matched in clearance, pushes the liftout cover; Die supporter is fixed on lathe inside, bears forging force.

Compared with prior art, the invention has the beneficial effects as follows: metal streamline and the finished product raceway method of work with forging molding is consistent to greatest extent, for bearing life is made maximum contribution.The extrusion process that twice different directions arranged, a forward extrusion, a backward extrusion, just in time can form the streamline that two places can be basically parallel to raceway, well solved the bad problem of process flowing line in the past, simultaneously mobile die structure of the present invention can well need some given shapes the molding mode of forward extrusion to become to be easy to, to have solved the problem that common hot forward extrusion part owes to be full of, be a kind of conventional design that breaks through.

Description of drawings

Fig. 1 is first kind of conventional process flow figure;

Fig. 2 is second kind of conventional process flow figure;

Fig. 3 is a process chart of the present invention;

Fig. 4 is the present invention's view when the forging and pressing beginning;

Fig. 5 is the schematic diagram of the present invention at forging and pressing bottom dead centre state;

Fig. 6 is blank final shaping unit schematic diagram of the present invention and final shaping unit mould.

Specific embodiments

Below in conjunction with accompanying drawing structure of the present invention is described further, but can not be construed as limiting the invention, and the present invention all the other do not explain that part is all consistent with prior art.

The wheel hub bearing outer ring double-side molding process as shown in Figure 3, includes following processing step:

1) blanking: according to fabricated part size design forging drawing, can obtain the sufficient forging volume of moulding behind the thickness of design honest material core, and then calculate bar diameter and length, guarantee that bar draw ratio 0.8-1.2 gets final product.

2) jumping-up: upset diameter gets final product less than forging molding outside dimension 0.5-1 millimeter.

3) preformed: the design of this station mould is the core of this invention, and it can be ready for final shaping unit, guarantees the adequacy of final shaping unit, if this work step not, the phenomenon that forming part lower end one side can't be full of can appear in straight forming, does not reach designing requirement.The mould installation diagram of this work step is seen Fig. 4-5.Wherein die sleeve 1 is fixed on the lathe, and the machine startup back punching head moves back and forth, and will expect that cake 8 delivers to the preformed station with on the forging mold, and drift begins punching press material cake and carries out moulding.Left half sectional view among Fig. 4 is the state of forging and pressing beginning, and at this moment, the material cake that drift 3 is just good with jumping-up is pressed into mobile die 2, and the outer step of drift has also just begun to begin to contact with mobile die 2.Right half sectional view is the state that pre-shaping blank 9 is ejected, and by ejector pin 6 top liftouts covers 5 blank is ejected from mobile die 2 and core rod 4.The left half sectional view of Fig. 5 is the state that is swaged into bottom dead centre, and drift rollback, the unique distinction of this forging mode are exactly that drift forces mobile die to move simultaneously, with the metal forging moulding, is different from common drift motion, the forging and pressing mode that die is fixing.This mode has well solved the problem of hot forward extrusion distortion difficulty, and metal is easy to be full of under the mode of forward extrusion.Its profoundness converts forward extrusion to backward extrusion exactly: if regard core rod 4 as drift, this motion combination of mobile die 2 and drift 3 just in time forms the concave die cavity of a sealing, sees their relative motion again, just in time is a kind of molding mode of backward extrusion.

4) moulding: the blank that preformed is good enters the shape that the final shaping unit mould further is molded into the final shaping unit blank 10 of design, thereby forms the best streamline that needs.As shown in Figure 6, the forging mold the when mould structure of final shaping unit is similar to preformed, unique difference is that molding concave die 11 is no longer mobile, but is fixed on the die sleeve anti-extrusion.

5) final molding is expanded in cold rolling: by cold rolling, product size can be enlarged again, allowance reduces, and because of its symmetrical shape, cold rolling effect is also wanted material-saving than traditional handicraft shown in Figure 2.This technology not necessarily at different product sizes, also can arrive just to forge and finish.

The special-purpose forging mold that above-mentioned preforming process adopts includes die sleeve 1, mobile die 2, core rod 4, liftout cover 5, ejector pin 6 and die supporter 7, and wherein mobile die and die sleeve are matched in clearance, and mobile die can carry out moving of a segment distance in die sleeve; Core rod is fixed in the die sleeve, cooperates mobile die, drift to carry out moulding; Liftout is set between mobile die and the core rod, is matched in clearance with them, is responsible for liftout work; Ejector pin is arranged in the die supporter, and ejector pin and die supporter are matched in clearance, pushes the liftout cover; Die supporter is fixed on lathe inside, bears forging force.

Claims

1. the wheel hub bearing outer ring double-side molding process includes following processing step: 1) blanking; 2) jumping-up; 3) preformed; 4) moulding; Wherein during step 3) preformed, at first die sleeve is fixed on the lathe, the machine startup back punching head moves back and forth, to expect that cake delivers to the preformed station with on the forging mold, drift begins punching press material cake, after drift will expect that cake is pressed into mobile die, the outer step of drift begins to contact with mobile die, at this moment, drift forces mobile die to move downward simultaneously, will expect that cake carries out preformed, runs to after bottom dead center, the drift rollback is ejected from mobile die and core rod by the blank that it is good with preformed that ejector pin pushes the liftout cover then.

2. by the described wheel hub bearing outer ring double-side molding process of claim 1, it is characterized in that the described blanking of step 1) is according to fabricated part size design forging drawing, can obtain the forging volume of moulding when abundant behind the thickness of design honest material core, and then calculate bar diameter and length, wherein the bar draw ratio is 0.8-1.2.

3. the forging mold of the described wheel hub bearing outer ring double-side molding process of claim 1, it is characterized in that including die sleeve (1), mobile die (2), core rod (4), liftout cover (5), ejector pin (6) and die supporter (7), wherein mobile die and die sleeve are matched in clearance; Core rod is fixed in the die sleeve; Liftout is set between mobile die and the core rod, is matched in clearance with them; Ejector pin is arranged in the die supporter, and ejector pin and die supporter are matched in clearance.