CN112223785A

CN112223785A - Preparation method of torsion bar spring and torsion bar spring

Info

Publication number: CN112223785A
Application number: CN202011046852.6A
Authority: CN
Inventors: 柯俊; 宋廷伦; 瞿元; 秦玉林; 阴山慧; 李志虎
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-01-15

Abstract

The disclosure provides a preparation method of a torsion bar spring and the torsion bar spring thereof, belonging to the technical field of motor vehicles. The preparation method comprises the following steps: providing a filler rod; providing a prepreg, and cutting the prepreg to obtain a cut material; coating the cut material coil on the outer wall of the filling rod to obtain a preformed body; curing and molding the pre-molded body to obtain a cured molded body; providing joints, and bonding the joints at two ends of the solidified molded body to obtain a torsion bar spring; and spraying a protective layer on the outer surface of the torsion bar spring. The torsion bar spring can reduce the whole mass and meet the requirement of light weight implementation of an automobile.

Description

Preparation method of torsion bar spring and torsion bar spring

Technical Field

The disclosure belongs to the technical field of motor vehicles, and particularly relates to a preparation method of a torsion bar spring and the torsion bar spring.

Background

Torsion bar springs are widely used elastic elements in automotive chassis systems. Torsion bar springs have a number of advantages over leaf springs, for example, they have a high energy storage per unit mass, so that the vehicle mass can be reduced and material can be saved. And because the torsion bar spring is fixed on the frame, the unsprung mass is reduced, and the ride comfort of the automobile is improved. When the torsion bar spring is applied to a front suspension of a front drive automobile, the torsion bar spring can be longitudinally arranged to reserve a space for a swing half shaft of a front drive axle.

In the related technology, the torsion bar spring is made of chrome vanadium alloy spring steel and is installed and connected in the chassis.

However, the torsion bar spring made of the chrome vanadium spring steel is heavy, so that the torsion bar spring is heavy, which is not favorable for light-weight implementation of automobiles.

Disclosure of Invention

The embodiment of the disclosure provides a preparation method of a torsion bar spring and the torsion bar spring, which can realize light implementation of an automobile. The technical scheme is as follows:

the embodiment of the disclosure provides a preparation method of a torsion bar spring, which comprises the following steps:

providing a filler rod;

providing a prepreg, and cutting the prepreg to obtain a cut material;

coating the cut material coil on the outer wall of the filling rod to obtain a preformed body;

curing and molding the pre-molded body to obtain a cured molded body;

providing joints, and bonding the joints at two ends of the solidified molded body to obtain a torsion bar spring;

and spraying a protective layer on the outer surface of the torsion bar spring.

In another implementation manner of the present disclosure, the providing a prepreg and cutting the prepreg to obtain a cut material includes:

providing a plain weave fiberglass reinforced polyurethane based prepreg;

and cutting the plain woven glass fiber reinforced polyurethane-based prepreg to obtain the cutting material, wherein the cutting material is adapted to the outer contour of the filling rod.

In yet another implementation of the present disclosure, the wrapping the cut material coil around an outer wall of the filling rod to obtain a preform includes:

and coating the cutting material along the outer wall of the filling rod, so that the weft direction of the plain weave glass fiber reinforced polyurethane-based prepreg is inclined at an angle with the axial direction of the filling rod.

In another implementation manner of the present disclosure, the performing curing molding on the preform to obtain a cured molded body includes:

providing a mould, and carrying out pretreatment on the mould;

placing the preformed body into a mold cavity of the mold, closing the mold and injecting resin, so that the cutting material and the filling rod are cured and molded to obtain a cured body rough blank;

and taking out the solidified body rough blank from the die, removing burrs of the solidified body rough blank, and carrying out post-solidification treatment on the solidified body rough blank to obtain the solidified body.

In another implementation manner of the present disclosure, the performing the preliminary treatment on the mold includes:

cleaning the mold;

coating a release agent in the mould;

preheating the mould.

In another implementation manner of the present disclosure, the mold assembly and resin injection for performing curing molding on the trim material and the filling rod to obtain a cured blank includes:

and injecting the resin into a die cavity of the die by high pressure, heating the die and laminating to obtain the solidified rough blank.

In another implementation manner of the present disclosure, the post-curing treatment of the cured body blank to obtain the cured body includes:

and placing the solidified body rough blank into a high-low temperature test box for baking to obtain the solidified body.

In another implementation manner of the present disclosure, the spraying of the protective layer on the outer surface of the torsion bar spring includes:

spraying epoxy resin, coating plain glass fiber cloth, spraying epoxy resin and spraying asphalt on the outer surface of the torsion bar spring in sequence;

and coating antirust paint on the surface of the joint.

In yet another implementation manner of the present disclosure, an embodiment of the present disclosure provides a torsion bar spring, which includes a spring body and two connecting shafts, wherein the two connecting shafts are respectively connected to end portions of the spring body;

the spring body comprises a shell and a filling rod, wherein the shell is a polyurethane-based composite material structural member; the filling rod is inserted into the shell along the length direction of the shell, the outer wall of the filling rod is connected with the inner wall of the shell, and the filling rod is a polyurethane structural member;

the torsion bar spring also comprises joints which are in one-to-one correspondence with the connecting shafts, and the joints are respectively fixedly sleeved on the corresponding connecting shafts.

In still another implementation manner of the present disclosure, the connecting shaft is a spline shaft, the joint is a spline joint that matches the connecting shaft, and an inner wall of the joint has an adhesive.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

when the manufacturing method of the torsion bar spring provided by the embodiment of the disclosure is used for processing and manufacturing the torsion bar spring, firstly, a filling rod with a proper size is selected so as to prepare for pre-dipping the subsequent coiled composite material fiber to form a pre-forming body, then, a prepreg is selected and cut to obtain a cut material with a proper size. And then curling the cutting material along the outer wall of the filling rod to obtain a preformed body to prepare for subsequent die forming, bonding and forming the composite material fiber pre-impregnated material and the filling rod together through die forming to obtain a cured body of the torsion bar spring, mounting the joint on the cured body to obtain the torsion bar spring, and finally spraying a protective layer on the torsion bar spring to finish the processing and manufacturing of the torsion bar spring.

The manufacturing method provided by the embodiment of the disclosure has the advantages that the steps are clear, the operation is simple, the material used by the torsion bar spring and the processing steps are changed, so that the shell and the filling rod of the spring body are both composite material structural members, the weight of the torsion bar spring can be greatly reduced, the obvious energy-saving and emission-reducing effects can be achieved, and the protective layer is sprayed on the outer surface of the torsion bar spring, so that the problems of rusting and corrosion do not exist, and a protective sleeve does not need to be additionally arranged.

In addition, the torsion bar spring is made of composite materials, and the specific strength, the specific modulus and the damping ratio of the composite materials are higher than those of spring steel, so that the energy storage capacity and the vibration damping performance of the torsion bar spring are obviously improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a flowchart illustrating a method for manufacturing a torsion bar spring according to an embodiment of the present disclosure;

FIG. 2 is a flow chart of another method for manufacturing a torsion bar spring according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a torsion bar spring according to an embodiment of the present disclosure;

FIG. 4 is a side view of a connecting shaft provided by an embodiment of the present disclosure;

fig. 5 is a side view of a joint provided by embodiments of the present disclosure.

The symbols in the drawings represent the following meanings:

1. a spring body;

11. a housing; 12. a filling rod; 111. layering; 112. a protective layer;

2. a connecting shaft;

3. and (4) a joint.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The embodiment of the present disclosure provides a method for manufacturing a torsion bar spring, as shown in fig. 1, the method for manufacturing a torsion bar spring includes:

s101: providing a filler rod;

s102: providing a prepreg, and cutting the prepreg to obtain a cut material;

s103: coating the cut material coil on the outer wall of the filling rod to obtain a preformed body;

s104: curing and molding the preformed body to obtain a cured molded body;

s105: providing joints, and bonding the joints at two ends of the solidified molded body;

s106: and spraying a protective layer on the outer surfaces of the solidified body and the joint to obtain the torsion bar spring.

When the manufacturing method of the torsion bar spring provided by the embodiment of the disclosure is used for processing and manufacturing the torsion bar spring, firstly, a filling rod with a proper size is selected so as to prepare for pre-dipping the subsequent coiled composite material fiber to form a pre-forming body, then, a prepreg is selected and cut to obtain a cut material with a proper size. And then curling the cutting material along the outer wall of the filling rod to obtain a preformed body to prepare for subsequent die forming, then bonding, forming and curing the composite material fiber pre-impregnated material and the filling rod together through die forming to obtain a cured body of the torsion bar spring, then installing the joint on the cured body, and finally spraying a protective layer on the cured body to finish the processing and manufacturing of the torsion bar spring.

The method for manufacturing the torsion bar spring provided by the embodiment of the disclosure is further described below with reference to fig. 2.

Fig. 2 is a flowchart of another torsion bar spring manufacturing method according to an embodiment of the present disclosure, and with reference to fig. 2, the manufacturing method includes:

s201: a filler rod is provided.

Alternatively, the filler rod may be a polyurethane rod structure.

In the implementation mode, the filling rod is made of polyurethane, so that the filling rod has strong bonding force, and can be firmly bonded with the shell in the molding process.

It will be appreciated that the filler rod may be other structural members of material such as a rubber rod or the like.

As the filling rod is used for preliminarily shaping the composite material fiber pre-impregnated material, the filling rod can meet the actual use requirement. The disclosure is not limited in this regard.

Illustratively, the filler rod may be a cylindrical structural member.

In the above implementation manner, the filling rod is set as a cylindrical structural member, so that the composite material fiber pre-impregnated material is wrapped on the outer wall of the filling rod in a winding manner in the subsequent step S203, so as to form a preform of the torsion bar spring.

Of course, the filling rod may also be other types of cylindrical structural members, such as a long-strip cylindrical structural member, as long as the filling rod can implement preliminary shaping on the prepreg so as to prepare for the subsequent step S203, and the embodiment of the present disclosure does not set any limit to this.

S202: providing a prepreg and cutting the prepreg to obtain a cut material.

Illustratively, step S202 may be implemented by:

first, a plain weave glass fiber reinforced polyurethane based prepreg was provided.

In above-mentioned implementation, plain weave glass fiber reinforcement polyurethane base prepreg, because it has advantages such as matter is light, intensity is high and be fit for the shaping, so, use this to invade the material in advance and can make the torsion bar spring rapid prototyping of preparation, can realize torsion bar spring's lightweight again simultaneously, also can satisfy the intensity demand in the in-service use moreover.

And then, cutting the plain weave glass fiber reinforced polyurethane-based prepreg to obtain a cutting material, wherein the cutting material is matched with the outer contour of the filling rod.

Illustratively, the plain weave glass fiber reinforced polyurethane based prepreg is cut with a cutting machine so that the size of the cut material is adapted to the size of the torsion bar spring.

In the implementation manner, the cutting machine can rapidly cut the cutting material suitable for processing the torsion bar spring, and the cutting material is cut into the shape and size suitable for the number of layers and the specification of the torsion bar spring laying layer, so that the preparation is made for the subsequent step S204 of curing and molding the cutting material, and the cured body of the torsion bar spring can be rapidly processed.

S203: and coating the cut material coil on the outer wall of the filling rod to obtain the preformed body.

In the implementation mode, the cutting material is curled on the outer wall of the filling rod, so that the cutting material and the filling rod are connected together, and meanwhile, the cutting material composite material fiber pre-impregnated material is preliminarily shaped under the action of the filling rod to obtain a pre-forming body, so that preparation is made in advance for the molding processing in the subsequent step S204, and the manufacturing efficiency of the torsion bar spring is improved.

S204: and curing and molding the preform to obtain a cured molded body.

In this embodiment, in order to efficiently cure the preform, the preform is cured and molded by a mold to obtain a cured product of the torsion bar spring.

Illustratively, step S204 may be implemented by:

firstly, providing a mould and carrying out pretreatment on the mould.

Illustratively, the mold is subjected to a pre-treatment comprising:

1. and cleaning the mold.

The mode can avoid impurity to cause the influence to solidification shaping.

2. And coating a release agent in the mold.

The mode can make the solidification type body that obtains after the moulding break away from the mould fast.

3. And preheating the die.

The above mode can make the resin added in the molding process flow in the mold cavity by itself, so that the curing agent can be uniformly coated on the periphery of the pre-molding body.

It should be noted that the mold is heated to a suitable temperature in advance, and if the polyurethane resin is preheated to 70 ℃, so as to ensure the fluidity of the resin.

And then, putting the preformed body into a cavity of a mold, closing the mold and injecting resin, so that the cutting material and the filling rod are cured and molded to obtain a cured body rough blank.

Illustratively, resin is injected into a cavity of a mold at high pressure, and the mold is heated and laminated to obtain a cured green body.

In the implementation mode, after the preformed body is placed in the mold cavity, when the preformed body is closed, resin is injected into the mold cavity under certain pressure in the film closing process, the temperature of the mold is increased to 90 ℃, and then the preformed body is cured and molded.

Then, the solidified body preform is taken out of the mold, burrs of the solidified body preform are removed, and the solidified body preform is subjected to post-curing treatment to obtain a solidified body.

Illustratively, post-curing the cured green body to provide a cured body comprising:

and (3) placing the solidified body rough blank into a high-low temperature test box for baking to obtain a solidified body.

In the above implementation, the rough blank of the cured body of the torsion bar spring is taken out by demolding, burrs on the outer surface of the rough blank are removed, and the rough blank is placed into a high-low temperature test box and baked at 120 ℃ for 2 hours to ensure sufficient post-curing of the resin.

And after the post-curing process is finished, taking out and naturally cooling.

S205: providing joints and bonding the joints at two ends of the solidified molded body.

Exemplarily, step S205 may be implemented by:

first, two linkers are selected.

Next, the joint is bonded to the connecting shaft with an adhesive.

In the above implementation, the joint metal piece is fitted to the spline at the end of the torsion bar spring made of a composite material, and is bonded by using a high-strength adhesive.

S206: and spraying a protective layer on the outer surfaces of the curing molded body and the connector to obtain the torsion bar spring.

Illustratively, step S206 may be implemented by:

spraying epoxy resin, coating plain glass fiber cloth, spraying epoxy resin and spraying asphalt on the outer surface of the cured body in sequence;

and (3) coating antirust paint on the surface of the joint.

In the implementation mode, the surface of the cured body is coated with a layer of epoxy resin, wrapped with a layer of plain glass fiber cloth, coated with a layer of epoxy resin and finally coated with asphalt, so that the torsion bar spring can be effectively protected, and the actual use performance of the torsion bar spring in an automobile is prevented from being influenced due to external surface collision, scratching, corrosion and the like in the use process.

By coating the antirust paint on the surface of the metal joint, the joint can be prevented from rusting, so that the service performance of the joint is influenced.

S207: and (4) loading the torsion bar spring for use.

In the above implementation manner, when the torsion bar spring is used, the torsion bar spring is directly loaded on a truck.

During loading, the automobile is connected with a chassis structure of an automobile through a joint in the torsion bar spring.

And finishing the preparation of the torsion bar spring.

Fig. 3 is a schematic structural view of a torsion bar spring according to an embodiment of the present disclosure, and with reference to fig. 3, a torsion bar spring according to an embodiment of the present disclosure is further provided, and as shown in fig. 3, the torsion bar spring is manufactured by the above-mentioned method. The torsion bar spring comprises a spring body 1 and two connecting shafts 2, wherein the two connecting shafts 2 are respectively positioned at two end parts of the spring body 1.

The spring body 1 comprises a shell 11 and a filling rod 12, wherein the shell 11 is a polyurethane-based composite material structural member; the filling rod 12 is inserted into the shell 11 along the length direction of the shell 11, the outer wall of the filling rod 12 is connected with the inner wall of the shell 11, and the filling rod 12 is a polyurethane structural member;

the torsion bar spring also comprises joints 3 which are in one-to-one correspondence with the connecting shafts 2, and the joints 3 are respectively fixedly sleeved on the corresponding connecting shafts 2.

When the torsion bar spring provided by the embodiment of the disclosure is used in an automobile, the torsion bar spring comprises a spring body, a connecting shaft and a joint, so that the torsion bar spring can be installed in a chassis of the automobile through the joint. And because the shell and the filling rod of the spring body are both composite material structural members, the weight of the torsion bar spring can be greatly reduced, and obvious effects of energy conservation and emission reduction can be achieved.

And adopt combined material for the torsion bar spring does not have the problem of rusty and corruption, need not set up the protective sheath.

In addition, the specific strength, specific modulus and damping ratio of the composite material are higher than those of spring steel, so that the energy storage capacity and vibration damping performance of the torsion bar spring are obviously improved.

The torsion bar spring provided by the embodiment of the disclosure has the advantages of simple structure and simple method, and the overall structure of the torsion bar spring is made by molding the composite material, so that the mass of the torsion bar spring can be greatly reduced, the automobile can meet the existing lightweight implementation, and the driving comfort of the automobile is improved.

As can be seen from the foregoing, the manufacturing of the housing 11 plays an important role in reducing the weight of the torsion bar spring and the like. Therefore, the structure of the housing 11 will be described with continued reference to fig. 1.

In this embodiment, the casing 11 includes a layer 111 and a protective layer 112, the layer 111 is a plain weave glass fiber reinforced polyurethane-based prepreg, and the protective layer 112 is a protective layer formed by curing a glass fiber cloth prepreg.

In the above embodiment, by providing the housing 11 with the layer 111 and the protective layer 112, the performance of the housing 11 can be protected by the protective layer 112.

That is, the layer 111 is a main body of the shell 11, and the protection layer 112 is for further protecting the layer 111, so as to ensure the usability and prolong the service life thereof.

The plain weave glass fiber reinforced polyurethane-based composite material layer is used as a layer, and the specific strength, specific modulus and damping ratio of the plain weave glass fiber reinforced polyurethane are higher than those of spring steel, so that the energy storage capacity and vibration damping performance of the torsion bar spring can be obviously improved when the torsion bar spring is manufactured, and the torsion bar spring is guaranteed to have better use performance.

Illustratively, the fill direction of the layup 111 is inclined at 45 to the axial direction of the filler rod 12.

In the above-described embodiment, the weft direction of the plain woven glass fibers of the layer 111 is set at an inclination of 45 ° to the center axis of the filler rod 12, since the spring body 1 of the torsion bar spring is used in a vehicle chassis to mainly bear torsional loads.

And the advantages of high strength and high modulus of plain weave glass fiber can be fully exerted under the layering angle of 45 degrees, and finally the spring body of the torsion bar spring is ensured to have high strength and high modulus.

The structure of the connecting shaft 2 and the joint 3 will be briefly described with reference to fig. 4 and 5.

Fig. 4 is a side view of a connecting shaft provided in the embodiment of the present disclosure, and in conjunction with fig. 4, the connecting shaft 2 is a spline shaft structural member.

In the above implementation mode, the connecting shaft 2 is set to be in a spline shape, and the spline is provided with the groove and the protrusion, so that the contact area between the connecting shaft and the chassis can be increased, the connection is further ensured to be more stable, and the centering performance is better during installation.

It should be noted that, when the torsion bar spring is manufactured, the mold cavity in the mold is not only adapted to the cylindrical structure (i.e. the spring body) in the middle of the torsion bar spring, but also the mold cavities for forming the spline shaft of the connecting shaft are respectively arranged at the two ends of the mold cavity.

Fig. 5 is a side view of a joint provided by an embodiment of the present disclosure, in conjunction with fig. 5, exemplarily, the joint 3 is a spline joint matching the connecting shaft 2, and an inner wall of the joint 3 has an adhesive.

In the above implementation manner, the joint 3 is set to be in a spline shape, and since the connecting shaft 2 is in a spline shape, the joint 3 is set to be in a shape matched with the connecting shaft 2 in order to be better assembled with the connecting shaft 2, so that the bonding strength between the joint and the connecting shaft can be remarkably improved, and the structural stability of the torsion bar spring is further ensured.

In addition, as above, the spline has the groove and the protrusion, so that the contact area between the connecting shaft and the chassis can be increased, the connection between the joint 3 and the chassis is further ensured to be more stable, and the centering performance during installation can be better.

Illustratively, the joint 3 is a metal structural member.

In the above implementation manner, the joint 3 is set as a metal structural member, which can ensure high strength, and the joint 3 can be conveniently, quickly and firmly connected when being connected with the automobile chassis.

The operation of the torsion bar spring provided by the embodiments of the present disclosure is briefly described as follows:

the joint 3 of the torsion bar spring is mounted with a corresponding connection to the chassis of the vehicle.

When the torsion bar spring is actually used, the spring body of the torsion bar spring is made of composite materials, so that the torsion bar spring can be lighter than a metal torsion bar spring by more than 40%, and obvious energy-saving and emission-reducing effects can be achieved; in addition, the specific strength, specific modulus and damping ratio of the composite material are higher than those of spring steel, so that the energy storage capacity and vibration damping performance of the torsion bar spring are obviously higher than those of the traditional torsion bar spring.

In addition, because the protective layer is sprayed on the outer surface of the torsion bar spring during manufacturing, the torsion bar spring has no problems of rusting and corrosion, and does not need to be additionally provided with a protective sleeve.

The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.

Claims

1. A method for manufacturing a torsion bar spring, comprising:

providing a filler rod;

providing a prepreg, and cutting the prepreg to obtain a cut material;

curing and molding the pre-molded body to obtain a cured molded body;

and spraying a protective layer on the outer surface of the torsion bar spring.

2. The method according to claim 1, wherein the providing of the prepreg and the cutting of the prepreg to obtain a cut material comprises:

providing a plain weave fiberglass reinforced polyurethane based prepreg;

3. The method of claim 2, wherein wrapping the cut material coil around an outer wall of the filler rod to obtain a preform comprises:

and coating the cutting material along the outer wall of the filling rod, so that the weft direction of the plain weave glass fiber reinforced polyurethane-based prepreg and the axial direction of the filling rod are inclined at 45 degrees.

4. The production method according to claim 3, wherein the subjecting the preform to curing molding to obtain a cured body comprises:

providing a mould, and carrying out pretreatment on the mould;

5. The method of claim 4, wherein the pre-treating the mold comprises:

cleaning the mold;

coating a release agent in the mould;

preheating the mould.

6. The manufacturing method according to claim 4, wherein the mold is closed and resin is injected, so that the cutting material and the filling rod are subjected to curing molding to obtain a cured body rough blank, and the method comprises the following steps:

7. The method of manufacturing according to claim 4, wherein the post-curing treatment of the cured body preform to obtain the cured body comprises:

8. The manufacturing method according to claim 7, wherein the step of spraying the protective layer on the outer surface of the torsion bar spring comprises:

and coating antirust paint on the surface of the joint.

9. A torsion bar spring manufactured by the method for manufacturing a torsion bar spring according to any one of claims 1 to 8,

the torsion bar spring comprises a spring body (1) and two connecting shafts (2), and the two connecting shafts (2) are respectively connected to the end part of the spring body (1), and is characterized in that;

the spring body (1) comprises a shell (11) and a filling rod (12), wherein the shell (11) is a polyurethane-based composite material structural member; the filling rod (12) is inserted into the shell (11) along the length direction of the shell (11), the outer wall of the filling rod (12) is connected with the inner wall of the shell (11), and the filling rod (12) is a polyurethane structural member;

the torsion bar spring further comprises joints (3) which correspond to the connecting shafts (2) one by one, and the joints (3) are fixedly sleeved on the corresponding connecting shafts (2) respectively.

10. A torsion bar spring according to claim 9, wherein the connecting shaft (2) is a spline shaft, the joint (3) is a spline joint matching the connecting shaft (2), and the inner wall of the joint (3) is provided with an adhesive.