JP2023148194A - Stabilizer manufacturing method and base material - Google Patents

Abstract

To provide a stabilizer manufacturing method capable of suppressing reduction in flatness at both ends of a stabilizer, and a base material.SOLUTION: This stabilizer manufacturing method for executing a forging process for a base material to manufacture a stabilizer having through-holes at both ends comprises: a projected part forming step of forming projected parts at through-hole forming positions of the ends of the base material corresponding to the through-holes of the stabilizer; and a through-hole forming step of forming through-holes at the through-hole forming positions including the projected parts.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method for manufacturing a stabilizer and a base material.

A stabilizer used in a vehicle or the like is attached to the vehicle to stabilize the posture of the vehicle. The stabilizer is formed, for example, by deforming a solid or hollow rod-shaped member (see, for example, Patent Documents 1 and 2). Both ends of the stabilizer are connected to the vehicle, and the connecting portions are planar. At the end of the stabilizer, after the rod-shaped member is flattened by crushing it, a through hole is formed into which a fastening member such as a bolt is inserted.

Japanese Unexamined Patent Publication No. 63-273541 Japanese Patent Application Publication No. 2007-320343

By the way, the through hole at the end of the stabilizer is formed by punching out the end with a punching member. At this time, the area around the through hole may be deformed due to friction generated during punching, and so-called sag may be formed. When the sag is formed, the flatness of the end portion is reduced, and there is a risk that the strength of the fastening member between the vehicle and the stabilizer may be reduced.

The present invention has been made in view of the above, and an object of the present invention is to provide a method for manufacturing a stabilizer and a base material that can suppress a decrease in flatness of both ends of the stabilizer.

In order to solve the above-mentioned problems and achieve the object, a method for manufacturing a stabilizer according to the present invention involves forging a base material to produce a stabilizer having through holes formed at both ends. The manufacturing method includes a step of forming a convex portion at a through hole forming position corresponding to the through hole in the stabilizer at an end of the base material, and a convex portion forming step at the through hole forming position including the convex portion. The method is characterized by including a step of forming a through hole.

Moreover, the method for manufacturing a stabilizer according to the present invention is characterized in that, in the above-mentioned invention, in the step of forming the convex portion, the convex portion is formed while flattening the end portion of the base material.

Further, in the above invention, the method for manufacturing a stabilizer according to the present invention further includes a heating step of heating an end portion of the base material, and the step of forming a convex portion is applied to the end portion heated by the heating step. The convex portion is formed by using the convex portion.

Further, the method for manufacturing a stabilizer according to the present invention is characterized in that the method further includes a burr removal step of removing burrs from a region including the through hole formed by the through hole forming step.

Further, in the method for manufacturing a stabilizer according to the present invention, in the above invention, the step of forming the convex portion is set based on the amount of sagging that is predicted based on actual measurement data of the degree of sagging that occurs when forming the through hole. The method is characterized in that the convex portion is formed.

Further, the base material according to the present invention is a base material for producing a stabilizer in which through holes are formed at both ends by forging process, and the base material corresponds to the through holes in the stabilizer at the ends of the base material. A convex portion is formed at the through hole forming position.

According to the present invention, it is possible to suppress a decrease in the flatness of both ends of the stabilizer.

FIG. 1 is a side view showing an example of the configuration of a stabilizer manufactured in an embodiment of the present invention. FIG. 2 is an enlarged view of region R shown in FIG. FIG. 3 is a diagram for explaining a manufacturing method for producing the stabilizer shown in FIG. 1. FIG. 4 is a diagram illustrating a base material for producing the stabilizer shown in FIG. 1, before a forging process. FIG. 5 is a diagram showing the configuration of the end portion of the base material before forging processing. FIG. 6 is a cross-sectional view taken along the line AA shown in FIG. FIG. 7 is a diagram (part 1) showing an example of a cross section of an end of a stabilizer in which a through hole is formed using a base material having a convex portion. FIG. 8 is a diagram (part 2) showing an example of a cross section of an end of a stabilizer in which a through hole is formed using a base material having a convex portion. FIG. 9 is a diagram (part 1) showing an example of a cross section of an end of a stabilizer in which a through hole is formed using a base material that does not have a convex portion. FIG. 10 is a diagram (part 2) showing an example of a cross section of an end of a stabilizer in which a through hole is formed using a base material that does not have a convex portion. FIG. 11 is a diagram for explaining the flatness at the end of a stabilizer in which a through hole is formed using a base material having a convex portion. FIG. 12 is a diagram for explaining the flatness at the end of a stabilizer in which a through hole is formed using a base material that does not have a convex portion. FIG. 13 is a diagram for explaining the parallelism at the end of a stabilizer in which a through hole is formed using a base material having a convex portion. FIG. 14 is a diagram for explaining the parallelism at the end of a stabilizer in which a through hole is formed using a base material that does not have a convex portion.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as "embodiments") will be described with reference to the accompanying drawings. Please note that the drawings are schematic, and the relationship between the thickness and width of each part, the ratio of the thickness of each part, etc. may differ from the actual one, and the dimensions may differ between the drawings. may include parts with different relationships and ratios.

(Embodiment)
FIG. 1 is a side view showing an example of the configuration of a stabilizer manufactured in an embodiment of the present invention. The stabilizer 1 shown in FIG. 1 is made of metal or various types of fibers (eg, carbon fibers). The stabilizer 1 includes a main body part 2 having bent ends and a straight central part, a first end part 3 provided at one end of the main body part 2, and a second end part 4 provided at the other end of the main body part 2. and has.

The main body portion 2 extends in a columnar shape, for example, a columnar shape. The main body portion 2 may be hollow or solid.

The first end portion 3 has a flat plate shape. A through hole 31 penetrating in the thickness direction is formed in the first end portion 3 .
The second end portion 4 has a flat plate shape. A through hole 41 penetrating in the thickness direction is formed in the second end portion 4 .
For example, when the stabilizer 1 is installed in an automobile, the first end 3 is connected to one of the left and right suspensions, and the second end 4 is connected to the other suspension. At this time, each end is fixed to the suspension by inserting a fastening member such as a bolt into the through hole.

Here, each end (first end 3 and second end 4) is required to have a flat fastening portion in order to suppress a decrease in fastening strength between the vehicle and the stabilizer 1 by the fastening member. . FIG. 2 is an enlarged view of region R shown in FIG. Although FIG. 2 shows the first end 3, it is similar to the second end 4. For example, in the first end 3, a region 32 located around the through hole 31 is required to be flat.

Next, a method for manufacturing the stabilizer 1 will be described with reference to FIGS. 3 to 6. FIG. 3 is a diagram for explaining a manufacturing method for producing the stabilizer shown in FIG. 1. The stabilizer 1 is manufactured by forging a base material.

The base material 10 is formed by bending both ends of a columnar shape, and has a main body 11 , a first end 12 , and a second end 13 . First, the first end 12 and second end 13 of the base material 10 are heated (see FIG. 3(a): heating step). In the heat treatment, each end is heated using, for example, a heating coil 110.

After heating both ends of the base material 10, each end is pressed (see FIG. 3(b): flattening step). For example, as shown in FIG. 3(b), the end of the base material 10 (the first end 12 in FIG. 3) is held by the holding member 120a, and the end placed on the holding member 120a is pressed. By pressing with the member 120b, the ends are crushed and flattened (see FIG. 3(c)). At this time, a recess 120c is formed in the pressing member 120b at a position corresponding to the position where the through hole is formed in the base material 10. Therefore, by flattening, a protrusion corresponding to the shape of the recess 120c is formed at the end of the base material 10 (protrusion forming step). In this embodiment, the flattening step and the protrusion forming step are performed simultaneously.

FIG. 4 is a diagram illustrating a base material for producing the stabilizer shown in FIG. 1, before a forging process. FIG. 5 is a diagram showing the configuration of the end portion of the base material before forging. FIG. 6 is a cross-sectional view taken along the line AA shown in FIG. The base material 10 shown in FIG. 4 and FIG. 13. Further, convex portions 12a and 13a are formed on the first end portion 12 and the second end portion 13, respectively.

For example, the convex portion 12a has a truncated cone shape and protrudes from the first end portion 12. The convex portion 12a is set at a position and in a shape that suppresses the occurrence of sag when the through hole is formed. For example, the convex portion 12a is set based on the amount of sagging that is predicted based on actual measurement data of the degree of sag that occurs when forming the through hole. The formation range of the convex portion 12a, for example, a region having a width W ₁ as a diameter at the proximal end portion protruding from the first end portion 12, is a region where the fastening member is disposed at the first end portion 12 (first end portion 3). It is set according to the area where it is set. The region in which this fastening member is provided is a region of the first end portion 12 that requires high flatness and parallelism. The convex portion 12a is formed, for example, in an area that is equal to or larger than the area where this fastening member is provided. Further, the width W ₁ of the convex portion 12a is set within a range of 30% or more and 70% or less of the width W ₂ at the tip. Further, the protrusion length H ₁ of the convex portion 12a is set in a range of 1% or more and 10% or less with respect to the thickness H ₂ of the first end portion 12 at a position excluding the convex portion 12a. In this embodiment, the convex portion 12a will be described as having a truncated cone shape, but it may have other convex shapes such as a truncated pyramid shape.
Note that the same applies to the convex portion 13a.

Returning to FIG. 3, after the first end 12 and second end 13 are formed, a cutting process is performed (see (d) in FIG. 3). In the cutting process, the first end 12 and the second end 13 are subjected to a through hole forming process (through hole forming step) and a trim process (trim process step). Although FIG. 3D shows an example of processing the first end 12, the same applies to the second end 13.

The through hole is formed by drilling into the first end 12 using the drilling member 130a. At this time, the first end 12 is placed on the support member 130b and pressed against the support member 130b by the stripper 130c. The support member 130b and the stripper 130c have a hollow portion through which the tip of the piercing member 130a can be inserted. A through hole is formed in the first end 12 by passing the stripper 130c through the perforating member 130a and punching out the through hole forming position of the first end 12 including the convex portion 12a (through hole shown in FIG. 3(e)). 12b).

In the trim processing, the outer shape of the first end portion 12 is formed using the trim blade 130d (see (d) in FIG. 3). In the trimming process, the outer shape of the first end 3 is formed by cutting the first end 12 along the processing line L _C using the trim blade 130d, as shown in FIG. 4, for example.
Note that the through-hole formation and trim processing may be performed in any order.

After the cutting process, a burr removal process is performed to remove burrs using the molded member 140a (see (e) in FIG. 3: burr removal step). At this time, the first end portion 12 is placed on the support member 140b. By sandwiching the first end portion 12 between the molded member 140a and the support member 140b, the burr formed around the through hole 12b is crushed and removed. As a result, the stabilizer 1 shown in FIG. 1 is manufactured.

Here, differences in cross-sectional shape depending on the presence or absence of convex portions in the base material will be explained with reference to FIGS. 7 to 10. FIGS. 7 and 8 are diagrams showing an example of a cross section of an end portion of a stabilizer in which a through hole is formed using a base material having a convex portion. FIG. 7 shows the outer edge of the end of the stabilizer in a cross section taken along a plane perpendicular to the longitudinal direction of the end of the stabilizer. In FIG. 7, the outer edge L ₁ is on the left side when viewed from the main body part 2, and the outer edge L ₂ is on the right side when seen from the main body part 2. FIG. 8 shows the outer edge of the end of the stabilizer in a cross section taken along a plane parallel to the longitudinal direction of the stabilizer and perpendicular to the cut surface of FIG. 7 . In FIG. 8, the outer edge _L3 shows the main body part 2 side, and the outer edge _L4 shows the outer edge on the opposite side to the main body part 2 side.
9 and 10 are diagrams showing an example of a cross section of an end portion of a stabilizer in which a through hole is formed using a base material that does not have a convex portion. FIG. 9 shows the outer edge of the end of the stabilizer in a cross section taken along a plane perpendicular to the longitudinal direction of the end of the stabilizer. In FIG. 9, the outer edge L ₁₁ is on the left side when viewed from the main body 2, and the outer edge L ₁₂ is on the right side when seen from the main body 2. FIG. 10 shows the outer edge of the end of the stabilizer in a cross section whose cut plane is parallel to the longitudinal direction of the end and perpendicular to the cut plane of FIG. 7 . In FIG. 10, an outer edge L ₁₃ indicates the main body 2 side, and an outer edge L ₁₄ indicates the outer edge on the opposite side to the main body 2 side.
Note that FIGS. 7 and 8 and FIGS. 9 and 10 show the ends of stabilizers in which through holes of the same diameter are formed using base materials of the same thickness. Further, the arrows shown in FIGS. 7 to 10 indicate the direction of entry of the perforating member.
As can be seen from FIGS. 7 to 10, it can be said that forming the through holes using a base material having convex portions (FIGS. 7 and 8) causes less sag and has a flat surface. .
In addition, in Figures 7 to 10, r _MIN indicates the minimum diameter of the area where flatness and parallelism must be ensured (for example, see area 32 in Figure 2), and r _MAX indicates the area where flatness and parallelism must be ensured. indicates the maximum diameter of the required area. That is, it is necessary to ensure flatness and parallelism in the range surrounded by r _MIN and r _MAX .

Furthermore, differences in flatness and parallelism depending on the presence or absence of convex portions in the base material will be explained with reference to FIGS. 11 to 14. Note that Figures 11 to 14 show the results of the end of the stabilizer manufactured using the same material and base material of the same shape except for the presence or absence of convex portions, and the flatness and parallelism are based on the reference values of the standard. The results are shown normalized as 1. FIG. 11 is a diagram for explaining the flatness at the end of a stabilizer in which a through hole is formed using a base material having a convex portion. FIG. 12 is a diagram for explaining the flatness at the end of a stabilizer in which a through hole is formed using a base material that does not have a convex portion. In FIGS. 11 and 12, for each sample, a plot of the flatness of one surface at one end (for example, the first end 3) of the stabilizer is indicated by a circle. Similarly, a plot of the flatness of the other surface at one end is ●, a plot of the flatness of one surface at the other end (for example, the second end 4) is □, and a plot of the flatness of the other surface at the other end (for example, the second end 4) is The flatness plot of the surface is shown by a black square. As shown in FIGS. 11 and 12, the stabilizer manufactured using a base material having convex portions has a smaller overall flatness at the end portions. In addition, a stabilizer manufactured using a base material that does not have a convex portion has a large difference in flatness on both sides of the end portion.

FIG. 13 is a diagram for explaining the parallelism at the end of a stabilizer in which a through hole is formed using a base material having a convex portion. FIG. 14 is a diagram for explaining the parallelism at the end of a stabilizer in which a through hole is formed using a base material that does not have a convex portion. 13 and 14, for each sample, the parallelism plot of one end (for example, the first end 3) of the stabilizer is ○, and the flatness plot of the other end (for example, the second end 4) is plotted. is indicated by ●. As shown in FIGS. 13 and 14, the stabilizer manufactured using a base material having convex portions has smaller parallelism at both ends as a whole. In addition, a stabilizer manufactured using a base material that does not have a convex portion has a large difference in parallelism between both ends.

In the embodiment of the present invention described above, a convex portion is formed in the base material for producing the stabilizer at the position where the through hole is to be formed, and a region including the convex portion is punched out to form the through hole. According to this embodiment, the formation of the convex portions suppresses the occurrence of sagging during punching, and as a result, it is possible to suppress the decrease in flatness of both ends of the stabilizer. Moreover, by suppressing the occurrence of sag, the accuracy of burr removal is also improved.

Further, in the embodiment, by forming the convex portion, it is possible to suppress warping of the end portion caused by the load during punching. By suppressing this warpage, it is possible to more reliably suppress a decrease in flatness and parallelism due to the formation of through holes.

Up to this point, the embodiments for carrying out the present invention have been described, but the present invention should not be limited only to the embodiments described above. For example, the present invention can be applied to products in which through-holes are formed by punching or trim processing is performed. Further, in the embodiment, an example has been described in which the end portion of the base material 10 is flattened and the convex portion is formed, but the flattening and the formation of the convex portion may be performed at different timings. That is, in the embodiment, the flattening step and the convex part forming step are performed simultaneously, but the flattening step and the convex part forming step may be performed at different timings.

As described above, the present invention may include various embodiments not described herein, and various design changes may be made within the scope of the technical idea specified by the claims. Is possible.

As explained above, the stabilizer manufacturing method and base material according to the present invention are suitable for suppressing a decrease in flatness of both ends of the stabilizer.

1 Stabilizer 2, 11 Main body 3, 12 First end 4, 13 Second end 10 Base material 12a, 13a Convex portion 31, 41 Through hole 120a Holding member 120b Pressing member 120c Recess 130a Punching member 130b, 140b Supporting member 130c Stripper 130d Trim blade 140a Molded member

Claims (6)

A method for manufacturing a stabilizer in which a base material is subjected to a forging process to produce a stabilizer in which through holes are formed at both ends, the method comprising:
forming a convex portion at a through hole forming position corresponding to the through hole in the stabilizer at the end of the base material;
a through hole forming step of forming a through hole at the through hole forming position including the convex portion;
A method for manufacturing a stabilizer, comprising: The step of forming the convex portion includes forming the convex portion while flattening the end portion of the base material.
The method for manufacturing a stabilizer according to claim 1, characterized in that: a heating step of heating an end of the base material;
further including;
The convex part forming step forms the convex part on the end heated by the heating step.
The method for manufacturing a stabilizer according to claim 1 or 2, characterized in that: a burr removal step of removing burrs from a region including the through hole formed by the through hole forming step;
The method for manufacturing a stabilizer according to any one of claims 1 to 3, further comprising: The step of forming the convex portion includes forming the convex portion set based on the amount of sagging that is predicted based on actual measurement data of the degree of sag that occurred when forming the through hole.
The method for manufacturing a stabilizer according to any one of claims 1 to 4. A base material for producing a stabilizer in which through holes are formed at both ends by a forging process,
a convex portion formed at the end of the base material at a through-hole formation position corresponding to the through-hole in the stabilizer;
A base material comprising:

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