JPH10264626A - Manufacture of suspension parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make suspension parts fabricable at low cost and raise degree of freedom in configuration as well as to simultaneously achieve increase in precision, strength and rigidity. SOLUTION: In the case of manufacturing suspension parts having one of its connecting ends 3, among both connecting ends 3, 4, made with different directional surface from the other connecting end 4, an extended shape material 10 of a cross section approximate to a final product including a link shape body 2 and both connecting ends 3, 4 of identical directional surface is formed, after which a rough shaped material 11 is formed by cutting the extruded shape material 10 into a specific length and the other connecting end 4 of the rough shaped material 11 is formed into a different directional surface by forging it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a suspension component such as an arm, a link and the like used for a suspension of an automobile.

[0002]

2. Description of the Related Art Suspension parts for automobiles usually do not have an axis extending in the same direction in each part. For example, in the case of a lower arm, both ends of the link-shaped main body are formed as connecting portions having mounting holes for swingably mounting to the vehicle body side and the wheel side via rubber bushes. Since the directions of the moving centers are different, the directions of the mounting holes are different, and the surface directions of the both end connecting portions are formed in different directions. Also, the both ends connecting portion has the same direction surface, and even if the swing centers of both mounting holes are in the same direction, the link-shaped main body portion has a mounting seat portion having a different direction surface with respect to the both ends connecting portion. May have. In addition, the lower arm is also formed with a plurality of weight reduction through holes for reducing the weight.

For this reason, in the conventional method of manufacturing a suspension part, a case in which a round bar or a square pipe is die-forged into a predetermined shape has been adopted. Since it is necessary to perform trimming, the amount of burrs to be removed is increased, the material yield is reduced, and the cost is increased.

Therefore, according to the method of manufacturing a suspension component described in Japanese Patent Application Laid-Open No. H06-255332,
An extruded profile having a cross-sectional shape similar to the shape of the final product is formed, and the extruded profile is cut to a predetermined length to form a coarse profile, and then one of the two connecting portions of the coarse profile is formed. The suspension part was manufactured by forming a different direction surface by twisting the end corresponding to the connecting part of the above, and forming mutually different mounting holes of the swing center at both ends of the crude material. .

[0005]

However, in such a conventional method of manufacturing a suspension component,
By twisting one of the connecting parts (also in the case of bending), the relative position of both connecting parts changes, which limits the accuracy of the pitch and the like between the mounting holes. In addition, there is a contradiction that the strength and rigidity cannot be increased so much in order to perform the twisting and the bending.

Further, with such a manufacturing method using torsion processing or bending processing, it is not possible to manufacture a suspension component having a mounting seat in a link-shaped main body in a direction different from that of a connecting portion.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a suspension part which can simultaneously increase accuracy and strength and rigidity, can be manufactured at low cost, and has a large degree of freedom in shape.

[0008]

A first aspect of the present invention comprises a link-shaped main body and connecting portions extending at both ends of the link-shaped main portion and having mounting holes with each other, and one of the two connecting portions is provided. When manufacturing a suspension component in which the other connecting portion is formed in a different direction surface with respect to the connecting portion, extrusion of a cross-sectional shape similar to a final product shape in which the link-shaped main body portion and both connecting portions have the same direction surface is performed. After forming the profile, the extruded profile is cut to a predetermined length to form a coarse profile, and then the other connecting portion of the coarse profile is forged to be formed on a different direction surface. It is characterized by the following.

According to a second aspect of the present invention, a link-shaped main body and a connecting portion extending at both ends of the link-shaped main body and having mounting holes are provided. When manufacturing a suspension component in which the other connecting portion is formed in a different direction surface, after forming the extruded section having a cross-sectional shape similar to the final product shape in which the link-shaped main body portion and both connecting portions have the same direction surface. The extruded profile is cut to a predetermined length to form a coarse profile, and then the other connecting portion of the coarse profile is forged to be formed in a different direction surface. It is characterized in that trimming is performed to form the thickness of the main body into a predetermined thickness.

[0010] Then, after the extruded profile is cut into a predetermined length to form a coarse profile, the other connecting portion of the coarse profile is forged to form a rough profile before being formed on a different direction surface. In the case where the material is subjected to solution treatment or the extruded shape is cut to a predetermined length, and the other connecting portion of the formed rough member is formed on the other direction surface by forging, and then the solution treatment is performed. Alternatively, the other connecting portion of the rough profile formed by cutting the extruded profile into a predetermined length is formed on a different direction surface by forging, and the thickness of both the connecting portion and the link-shaped main body is controlled to a predetermined value. In some cases, after a trimming process is performed to form the material into a thickness, a solution treatment is performed on the crude material.

[0011] Further, after forming the different direction surface by forging the other connecting portion of the rough profile formed by cutting the extruded profile into a predetermined length, one of the connecting portions formed on the different direction surface is formed. In some cases, a mounting hole is formed in a portion by machining or pressing.

Further, after the formation of the mounting holes, a solution treatment or an age hardening treatment may be performed.

A third aspect of the present invention comprises a link-shaped main body and connecting portions extending at both ends of the link-shaped main body and having mounting holes with respect to each other. When manufacturing a suspension component in which the other connecting portion is formed on a different direction surface, the other connecting portions of the pair of suspension components are joined together to form a final product in which the pair of both connecting portions have the same direction surface. After forming an extruded profile having an approximate cross-sectional shape, the extruded profile is cut into a predetermined length to form a coarse profile, and then the other pair of connecting portions of the coarse profile are simultaneously formed. After being formed on the different direction surface by forging, and further forming a long hole by machining or press working on the other pair of the two connecting portions formed on the different direction surface, the central portion of the long hole is divided. Then, one of the connecting portions of the divided crude material and By machining or pressing the junction of the square, it is characterized in that the formation of the mounting hole.

A fourth aspect of the present invention comprises a link-shaped main body and connecting portions extending at both ends of the link-shaped main portion and having mounting holes with respect to each other. When manufacturing a suspension component in which the other connecting portion is formed on a different direction surface, the other connecting portions of the pair of suspension components are joined together to form a final product in which the pair of both connecting portions have the same direction surface. After forming an extruded profile having an approximate cross-sectional shape, the extruded profile is cut into a predetermined length to form a coarse profile, and then the other pair of connecting portions of the coarse profile are simultaneously formed. Formed on the different direction surface by forging, and then subjected to trimming processing to form the thickness of the pair of connecting portions and the link-shaped main body to a predetermined thickness, and further, a pair of the formed on the different direction surface On both other connecting parts,
After forming a long hole by machining or pressing, the central portion of the long hole is divided, and one connecting portion and the other connecting portion of the divided coarse material are provided with mounting holes by machining or pressing. It is characterized by having been formed.

Then, after cutting the extruded profile into a predetermined length, the other two connecting portions are simultaneously forged to form a solution treatment before forming the extruded profile on a different direction surface, or to reduce the extruded profile to a predetermined length. After cutting to length, after forming the other two connecting parts on the different direction surface by forging at the same time, when performing solution treatment, or after cutting and forming the extruded shape to a predetermined length , By simultaneously forging both connecting parts, forming them in different directions, and performing trimming processing to form the thickness of both connecting parts and link-shaped main body to a predetermined thickness, and then solution-treating to the rough material May be applied.

Further, after the extruded profile is cut to a predetermined length and formed, the other two connecting portions are simultaneously forged and formed on the different direction surface, and then the other connecting portion formed on the different direction surface is formed. In some cases, the mounting holes are provided by machining or pressing. Further, after forming the mounting holes, a solution treatment or an age hardening treatment may be performed.

In any of the above-mentioned inventions, any one of the above-described methods is for forming a different direction surface existing in a link-shaped main body or a connecting portion by forging, and forming a mounting hole in the different direction surface by machining or pressing. In order to improve the accuracy of both mounting holes, and not to use twisting or bending,
It can be said that the strength and rigidity can be increased at the same time, and the degree of freedom of the shape that can be manufactured at low cost is increased.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
In this embodiment, which will be described with reference to the drawings, the method of the present invention is applied to the manufacture of a lower arm of a vehicle suspension.

FIG. 1 is a perspective view of a lower arm manufactured according to the present invention. The lower arm 1 has a horizontally long plate shape, and a connecting portion 3 attached to both ends of a central link-shaped main body 2 on the vehicle body and wheel sides, respectively. 4.

A plurality of weight reduction holes 5, 5,... Are formed in the link-shaped main body 2, and one connecting portion 3 has a square U-shape, and its legs 3a, 3b have , Mounting holes 6 and 6 are formed.

The other connecting portion 4 has a surface in a different direction from the surface of the link-shaped main body 2 and one connecting portion 3, and a mounting hole 7 is formed by machining.

In manufacturing such a lower arm 1, as shown in FIG. 2, first, a cross-sectional shape similar to a final product shape having a cross-sectional shape in the same direction is extruded to form a shape member 10.

The extruded profile 10 is formed by using an aluminum alloy material or the like and having the link-shaped main body portion 2 and the connecting portions 3 and 4 both having the same direction surface (surface intersecting the extrusion direction). Also, the weight reducing hole 5 of the link-shaped main body 2,
5 and the square U-shape of one of the connecting portions 3 are formed in parallel with the extrusion direction.

The extruded profile 10 thus formed is
It is cut to a predetermined length and formed into a rough material 11.

Next, of the two connecting portions 3 and 4 of the rough material 11, the other connecting portion 4 is formed on the different direction surface by forging. Next, both sides of the substantially central portion of the connecting portion 4 formed on the different direction surface are further forged to form a concave seat portion 8 (see FIGS. 4A and 4B).

Before or after forging the connecting portion 4, the solution 11 may be subjected to a solution treatment.

Next, a trimming process is performed to form the connecting portions 3 and 4 and the link-shaped main body 2 into a predetermined thickness.

Next, a mounting hole 7 is drilled in the concave seat portion 8 of the connecting portion 4 by machining or press working (see FIG. 5), and furthermore, both legs 3a, 3b of the connecting portion 3 are formed. The mounting hole 6 is formed by machining, and the lower arm 1 is formed.
Is formed (see FIG. 6).

Thereafter, if necessary, the lower arm 1 is subjected to a solution treatment and an age hardening treatment through a washing step, and thereafter, the insulator 9 is pressed into the mounting hole 7 (FIG. 7).
See).

FIGS. 8 and 9 show another embodiment of the present invention. 8 (1), one of the connecting portions 3 has an O-shape, and the other connecting portion 4 has a convex portion 12 whose central portion is raised. This is a case where mounting holes 7, 7 are provided on both sides, and since this convex portion 12 cannot be formed simultaneously by extrusion, a rough material 21 as shown in FIG. Is formed in advance, and the other connecting portion 4 is forged to form a convex portion 12. Further, mounting holes 7, 7 are formed on both sides of the convex portion 12 by machining or pressing. ing.

FIG. 9 shows a pair of lower arms 1,
1 (see FIG. 9 (1)). That is, the link-shaped main body 2 and the connecting portions 3 and 4 extending at both ends of the link-shaped main body 2 are provided in advance, and the link-shaped main body and both the connecting portions 3 and 4 have the same direction surface. A pair of extruded profiles having a cross-sectional shape similar to the shape of the final product are formed by joining the other connecting portions 4, 4 together to form an extruded profile (not shown).

Next, the extruded profile is cut into a predetermined length to form a coarse profile (30), and the pair of one connecting portions 3 and 3 of the coarse profile 30 are forged at the same time. It is formed on the directional surface (see FIG. 9 (2)).

Next, if necessary, trimming is performed to form the connecting portions 3 and 4 and the link-shaped main body portion 2 to a predetermined thickness, and one connecting portion formed on the different direction surface is further formed. 3, a central portion (a dashed line portion) of the long hole 32 is divided after forming a long hole 32 by machining or press working, and one connecting portion 3 is formed into a substantially square U-shape. Forming the divided coarse shaped material 31, mounting holes 6 and 7 are formed in one connecting portion 3 and the other connecting portion 4 of the pair of divided rough shaped materials 31 and 31 by machining or press working, respectively. A pair of lower arms 1 and 1 are formed. Before or after forging the other connecting portion 4, a solution treatment may be performed on the rough material 30.

Thereafter, if necessary, the lower arm 1 is subjected to a solution treatment and an age hardening treatment through a washing step, and then the insulator 9 is pressed into the mounting hole 4 (FIG. 7).
See).

In the embodiment shown in FIGS. 1 to 7,
The weight reducing holes 5, 5,... Are rectangular holes, and the corners thereof have an R shape of about 2 mm to 5 mm, so that the notch effect on the pulling / compression input in the lower arm 1 is reduced. Is intended for.

When the weight reducing holes 5, 5,... Have rounded corners, in the elastic range of the lower arm 1 itself, it works very effectively to reduce the notch effect. If the stress concentration on the corners of the R-shape becomes large with respect to the bending displacement, it is necessary to increase the buckling load of the lower arm 1. However, measures against the increase of the buckling load have some limitations.

FIG. 10 shows still another embodiment of the present invention designed to increase the buckling load.

That is, the lower arm 1 shown in FIG.
This is an example in which the shape in the length direction of the lower arm 1 in the weight reducing holes 5, 5,... Is a continuous curved surface such as a circle or an ellipse.

According to this, the stress concentration on the corners of the weight reducing holes 5, 5,... Can be made extremely small, and the buckling load of the lower arm 1 can be greatly increased.

[0040]

According to a first aspect of the present invention, a link-shaped main body and connecting portions extending at both ends of the link-shaped main portion and having mounting holes are provided, and one of the connecting portions is connected to one of the connecting portions. On the other hand, when manufacturing a suspension component in which the other connecting portion has a different direction surface, an extruded section having a cross-sectional shape similar to the final product shape in which the link-shaped main body portion and both connecting portions have the same direction surface was formed. Thereafter, the extruded profile is cut into a predetermined length to form a coarse profile, and then the other connecting portion of the coarse profile is formed by forging on a different direction surface,
A second invention comprises a link-shaped main body portion and a connecting portion extending at both ends of the link-shaped main body portion and having attachment holes with each other,
When manufacturing a suspension component in which one of the two connecting portions has a different connecting surface with respect to the other connecting portion, the link-shaped main body portion and both connecting portions approximate a final product shape having the same direction surface. After forming an extruded section having a cross-sectional shape, the extruded section is cut into a predetermined length to form a coarse section, and then the other connecting portion of the coarse section is forged by forging. It is characterized in that it is formed on the directional surface, and is subjected to a trimming process so as to form the thickness of both the connecting portion and the link-shaped main portion to a predetermined thickness. Further, a third invention comprises a link-shaped main body portion and a connecting portion extending at both ends of the link-shaped main body portion and having mounting holes with each other, and the other of the two connecting portions with respect to one of the connecting portions. When manufacturing a suspension component in which the connecting portion is formed on a different direction surface, the other connecting portions of the pair of suspension components are connected to each other,
After forming an extruded profile having a cross-sectional shape similar to the final product shape in which the pair of the two connecting portions have the same direction surface, the extruded profile is cut into a predetermined length to form a coarse profile, Next, a pair of the other connecting portions of the crude material are simultaneously formed on the different direction surface by forging, and further, a pair of the other connecting portions formed on the different direction surface are machined or pressed. After the long hole is formed, the central part of the long hole is divided, and one of the connecting portions and the other connecting portion of the divided coarse material are formed with a mounting hole by machining or pressing. According to a fourth aspect of the present invention, a link-shaped main body portion and a connecting portion extending at both ends of the link-shaped main body portion and having mounting holes are provided, and one of the two connecting portions is provided with a connecting portion. The suspension part with the other connecting part formed in the different direction If you, by coupling the connecting portions of the other of the pair of suspension components, after which the pair of the two joining portions were molded extruded shape members having a transverse cross-sectional shape similar to the final product shape having the same direction plane,
The extruded profile is cut to a predetermined length to form a coarse profile, and then the other pair of connecting portions of the coarse profile is forged at the same time to form a different direction surface, and then a pair of coarse profiles is formed. Trimming processing is performed to form the thickness of both the connecting portions and the link-shaped main body to a predetermined thickness, and further, a long hole is formed in the pair of the other connecting portions formed on the different direction surfaces by machining or pressing. After applying, the central portion of the elongated hole is divided, and the attachment hole is formed by machining or pressing at one of the connecting portion and the other connecting portion of the divided coarsely shaped material. It is.

Therefore, in any case, the present invention
Since the different direction surface existing in the link-shaped main body portion or the connecting portion is formed by forging, and the mounting hole is formed in this different direction surface by machining or press working, the accuracy of both mounting holes and the like is improved, and Since no torsion or bending is used, it can be said that the strength and rigidity can be increased at the same time, and the degree of freedom of the shape that can be manufactured at low cost can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lower arm manufactured according to an embodiment of the present invention.

FIG. 2 shows the first embodiment of the present invention, and is a perspective view showing a pressed member which is in the middle of manufacturing a lower arm.

FIG. 3 is a perspective view of a rough shaped material showing a stage in which the other connecting portion of the pressed material of FIG. 2 is forged and formed on a different direction surface.

4 (1) is a perspective view of the coarsely shaped material showing a stage in which the other connecting portion of the forged crude material in FIG. 2 is further forged to form a concave seat at the center of the connecting portion. , (2) is (1)
It is AA sectional drawing of.

5 is a cross-sectional view taken along the line AA similar to FIG. 4 (1), showing a stage in which a mounting hole is formed in a seat portion of the crude material in FIG.

FIG. 6 is a perspective view of the lower arm at a stage where a mounting hole is formed in one connecting portion of the crude material to form a lower arm.

FIG. 7 is an exploded perspective view showing a step of press-fitting an insulator into a mounting hole of the other connecting portion of the lower arm in FIG. 6;

FIG. 8 is a perspective view of a lower arm manufactured according to another embodiment of the present invention, and FIG. 8 is a perspective view showing a coarse material stage of the lower arm.

9A is a perspective view of a pair of lower arms similarly manufactured according to another embodiment of the present invention, FIG. 9B is a perspective view showing a coarse material stage of the lower arm, and FIG. 2)
FIG. 5 is a perspective view showing a stage in which a long hole is formed in the other connected portion of the crude material having the same shape.

FIG. 10 is a perspective view of a lower arm manufactured according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower arm (suspension part) 2 Link-shaped main body part 3 One connection part 3a, 3b Leg part 4 The other connection part 6, 7 Mounting hole 8 Concave seat part 10 Extruded shape material 11, 21, 30 Coarse shape material 12 Convex part 31 Coarse material 32 Slotted hole

Claims (16)

[Claims] 1. A link-shaped main body part and a connecting part extending at both ends of the link-shaped main body part and having attachment holes with each other,
When manufacturing a suspension component in which one of the two connecting portions is formed on the other side with respect to the other connecting portion, the link-shaped main body and both connecting portions have a final product shape having the same direction surface. After forming an extruded section having an approximate cross-sectional shape, the extruded section is cut into a predetermined length to form a coarse section, and then the other connecting portion of the coarse section is forged. A method of manufacturing a suspension component, wherein the suspension component is formed on a different direction surface. 2. A structure comprising a link-shaped main body and connecting portions extending at both ends of the link-shaped main body and having mounting holes with each other,
When manufacturing a suspension component in which one of the two connecting portions is formed on the other side with respect to the other connecting portion, the link-shaped main body and both connecting portions have a final product shape having the same direction surface. After forming an extruded section having an approximate cross-sectional shape, the extruded section is cut into a predetermined length to form a coarse section, and then the other connecting portion of the coarse section is forged. A method of manufacturing a suspension component, comprising forming on a different direction surface and performing trimming processing to form a thickness of both a connecting portion and a link-shaped main body to a predetermined thickness. 3. After the extruded profile is cut to a predetermined length to form a coarse profile, the extruded profile is formed into a rough shape before being formed on a different direction surface by forging the other connecting portion of the coarse profile. 3. The method for manufacturing a suspension component according to claim 1, wherein the material is subjected to a solution treatment. 4. The extruded shape material is cut into a predetermined length, and the other connection portion of the rough shape material is formed on the other direction surface by forging, and then the solution material treatment is performed on the rough shape material. The method for manufacturing a suspension component according to claim 1 or 2, wherein 5. The other connecting portion of the rough shaped material formed by cutting the extruded shape material into a predetermined length is formed on the different direction surface by forging, and the thickness of both connecting portions and the link-shaped main body portion is formed. 3. The method of manufacturing a suspension component according to claim 2, wherein a solution treatment is performed after performing a trimming process to form the suspension component into a predetermined thickness. 6. The method of manufacturing a suspension component according to claim 1, wherein a mounting hole is formed in said different direction surface by machining or press working. 7. A solution treatment or an age hardening treatment after forming the mounting hole.
A method for manufacturing the suspension component described in the above. 8. A structure comprising a link-shaped main body and connecting portions extending at both ends of the link-shaped main body and having attachment holes with each other,
When manufacturing a suspension component in which the other connecting portion is formed on a different direction surface with respect to one connecting portion of the both connecting portions, the other connecting portions of the pair of suspension components are joined together to form a pair of the After forming an extruded profile having a cross-sectional shape similar to the final product shape in which both connecting portions have the same direction surface, the extruded profile is cut into a predetermined length to form a coarse profile, and then Formed on the different direction surface by forging the pair of other connecting portions of the rough material at the same time,
Furthermore, after forming a long hole by machining or press working on the other pair of the two connecting portions formed on the different direction surface, the central portion of the long hole is divided, and one of the divided coarse shaped materials is divided. By machining or press working on the connecting part and the other connecting part,
A method of manufacturing a suspension component, wherein a mounting hole is formed. 9. A structure comprising a link-shaped main body and connecting portions extending at both ends of the link-shaped main body and having attachment holes with each other,
When manufacturing a suspension component in which the other connecting portion is formed on a different direction surface with respect to one connecting portion of the both connecting portions, the other connecting portions of the pair of suspension components are joined together to form a pair of the After forming an extruded profile having a cross-sectional shape similar to the final product shape in which both connecting portions have the same direction surface, the extruded profile is cut into a predetermined length to form a coarse profile, and then Formed on the different direction surface by forging the pair of other connecting portions of the rough material at the same time,
Next, trimming is performed so that the thickness of the pair of both connecting portions and the link-shaped main body portion is formed to a predetermined thickness, and further, the other pair of connecting portions formed on the different direction surface is machined or pressed. After forming a long hole by processing, the central portion of the long hole is divided, and one connecting portion and the other connecting portion of the divided coarse material are formed with a mounting hole by machining or pressing. A method for manufacturing a suspension component. 10. The method according to claim 1, wherein after the extruded section is cut into a predetermined length, the rough section is subjected to a solution treatment before being formed on a different direction surface by simultaneously forging the other two connecting portions. The method for manufacturing a suspension component according to claim 8 or 9, wherein 11. The extruded profile is cut to a predetermined length, and the other two connecting portions are simultaneously forged to form a different direction surface, and then the rough profile is subjected to a solution treatment. 10. The method of manufacturing a suspension component according to claim 8, wherein 12. The extruded section is cut into a predetermined length, and the other connection section of the rough section is formed on the other direction surface by forging, and the thickness of both the connection section and the link-shaped main section is formed. 10. The method for manufacturing a suspension component according to claim 9, wherein a solution treatment is performed after a trimming process is performed to form the suspension component into a predetermined thickness. 13. A mounting hole is formed in said different direction surface by machining or press working.
13. The method for manufacturing a suspension component according to any one of claims 12 to 12. 14. The method for manufacturing a suspension component according to claim 13, wherein a solution treatment or an age hardening treatment is performed after the formation of the mounting hole. 15. The suspension according to claim 1, wherein, at the time of forming the extruded profile, a hole for reducing the weight is formed in the two connecting portions at the same time in a direction parallel to the extruding direction. The method of manufacturing the part. 16. The method of manufacturing a suspension component according to claim 15, wherein the weight reducing hole has a curved surface shape that is continuous in a length direction of the suspension component.