JPH0666343A - Manufacture of fitting bracket for cylinder device - Google Patents

Abstract

PURPOSE:To improve productivity by integrally punching a belt-like section and a pair of leg sections from a plate body, forming outward recessed curve face sections at the boundary positions between them, folding the belt-like section into circular cylindrical sections, making the tip side of the leg sections from the curve face sections flat, and boring fitting holes on the leg sections. CONSTITUTION:A rectangular belt-like section 21 and tongue piece-like leg sections 22 are integrally punched from a plate material made of a hard steel material with a pressing machine. Bending pressurization is applied to the boundary positions between the belt-like section 21 and the legs 22 with the pressing machine, recessed curve sections 33 are formed in the upper and lower directions along the outer shape of an outer tube at the portions of the belt-like section 31 located above the leg sections 32, the boundary positions between the belt-like section 34 and the leg sections 32 are folded in the protruded direction of the recessed curve sections 33 to form swollen sections 34. When the belt-like section 31 is formed into a circular cylindrical section 41, the leg sections 42 are pressed, the leg sections 42 are molded into flat while swollen sections 44 are kept as they are, fitting holes 11D are bored on the lower end side of leg sections 11C, and the manufacture of a fitting bracket 11 is completed. It can be easily manufactured with little man-hours.

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 mounting bracket for a cylinder device, which is provided in a cylinder device such as a hydraulic shock absorber for a vehicle and which fixes the cylinder device to a vehicle body side of an automobile.

[0002]

2. Description of the Related Art A hydraulic shock absorber for a vehicle such as an automobile will be described as an example of a cylinder device according to the prior art with reference to FIGS.

In the figure, reference numeral 1 denotes an outer cylinder which constitutes the main body of the hydraulic shock absorber, and upper and lower ends of the outer cylinder 1 are caps 2 respectively.
A bump rubber receiver 3 is integrally fixed on the cap 2 by a lid (only the upper side is shown).

Reference numeral 4 denotes a piston rod projecting axially upward from the inside of the outer cylinder 1 via a cap 2 and the like. A threaded portion 4A is formed on the projecting end side of the piston rod 4, and the threaded portion 4A is Nuts on the body of the vehicle (none shown)
It is designed to be attached via the etc. The piston rod 4 extends and contracts with respect to the outer cylinder 1 in response to vibration of the vehicle and the like.

Reference numeral 5 designates a spring bearing fixed to the outer periphery of the upper side of the outer cylinder 1 by a fastening means such as welding. The spring bearing 5 is a suspension spring arranged between the piston rod 4 and the projecting end side (see FIG. The suspension spring receives the lower end of the piston rod 4 (not shown) and always urges the piston rod 4 in the extension direction.

Reference numeral 6 denotes a mounting bracket which is provided on the lower end side of the outer cylinder 1 and is made of a mild steel material or the like.
Is a tubular portion 6A fitted into the outer circumference of the lower end side of the outer cylinder 1 in a press-fitted state and fixed to the outer cylinder 1 by fixing means such as welding.
And a flange portion 6B that projects radially outward from the lower end side of the tubular portion 6A, and is arranged symmetrically on the outer peripheral side of the flange portion 6B, and faces downward through the shoulder portions 6C and 6C. Of the pair of leg portions 6D, 6D formed in a flat plate shape extending in a horizontal direction, and the leg portions 6D
It is roughly composed of an edging portion 6E which is located on the outer peripheral side and projects outwardly to give rigidity to each leg portion 6D, and a mounting hole 6F is formed in the lower end side of each leg portion 6D. ing. Then, the mounting bracket 6 has the mounting holes 6
Bolt on the axle side of the vehicle via F (neither is shown)
It is supposed to be fixed by.

Next, a method of manufacturing the above-mentioned mounting bracket 6 will be described with reference to FIGS. 11 to 16.

First, in the pressing step, as shown in FIG. 11, a punching die (neither is shown) attached to a press machine is used to form a large-diameter circular shape from a plate material made of a mild steel material having a high drawability. Created by integrally punching a narrowed portion A1 and a pair of projecting portions A2 and A2 that are symmetrically arranged on the outer periphery of the narrowed portion A1 and are provided so as to project radially outward from the narrowed portion A1. To do.

Next, in the drawing step, the drawing portion A1 created in the pressing step is subjected to deep drawing using a drawing die (not shown) attached to the press machine, and as shown in FIG. The upper end is the lid B1, and the lower end is the collar B2.
And a pair of leg portions B4 and B4 that are symmetrically arranged on the outer periphery of the collar portion B2 and that are integrally provided so as to project radially outward from the collar portion B2. To mold.

Next, in the lid cutting step, the upper end side of the tubular portion B3 formed in the drawing step is horizontally cut. As a result, as shown in FIG. 13, the upper end side of the tubular portion C1 is opened while the tubular portion C1, the collar portion C2, and the leg portions C3 remain in the same shape.

Then, in the edging molding step, edging is applied to the outer peripheral side of each leg C3 described in the lid cutting step, and as shown in FIG. 14, the tubular portion D1 and the collar portion D2 remain in the same shape. The edging portions D4 and D4 are formed on the outer peripheral side of each leg D3 so as to project upward.

Next, in the leg bending step, each leg D3 having the outer edge D4 formed on the outer peripheral side in the above-mentioned edge forming step.
Is bent downward at an angle of about 90 degrees from the boundary position with the collar portion D2, and as shown in FIG.
With the same shape of the collar part E2, the leg parts E3 are arranged in parallel with the edging part E4 so as to extend downward via the shoulder part E5.

In the mounting hole drilling step, each leg E3 bent downward in the leg bending step is perforated, and as shown in FIG. 16, a tubular portion 6A and a collar portion 6B are formed. ，
The shoulder portion 6C and the edging portion 6E have the same shape, but each leg portion 6D
The mounting hole 6F is formed in the lower end side of the mounting bracket 6, and the manufacturing of the mounting bracket 6 is completed.

The hydraulic shock absorber according to the prior art has the above-mentioned structure, and the screw portion 4A of the piston rod 4 and each leg portion 6D of the mounting bracket 6 are attached to the vehicle body side and the axle side of the vehicle, respectively. Spring bearing 5 and piston rod 4
A suspension spring that constantly urges the piston rod 4 in the extending direction (upward in the drawing) and suspends the vehicle body side is provided between the suspension spring and the protruding end side. As a result, the piston rod 4 expands and contracts according to the vibration of the vehicle and the like, and at this time, a damping force is generated in the outer cylinder 1 to buffer the vibration of the vehicle.

[0015]

By the way, in the above-mentioned hydraulic shock absorber according to the prior art, when the mounting bracket 6 is manufactured, a pressing process, a drawing process, a lid cutting process, an edging molding process, a leg bending process are performed. Since the manufacturing process is performed by sequentially performing the mounting hole drilling process, there is a problem that the number of manufacturing processes is wide and the productivity is significantly reduced.

Further, in the mounting bracket 6 according to the prior art, since deep drawing is performed to form the tubular portion 6A, it is difficult to make the tubular portion 6A into a tubular shape with a uniform thickness, Thickness variation easily occurs in the tubular portion 6A. As a result, stress may be concentrated on the thin portion of the tubular portion 6A and damage may occur, resulting in a problem that yield and life are significantly reduced. Furthermore, in order to perform deep drawing, it is necessary to use mild steel, which has a high drawability, as the material, so it is not possible to use high rigidity material such as hard steel, and if the material is thick, Since wrinkles and cracks are likely to occur during the drawing process, there is a problem that the mounting bracket 6 cannot be made highly rigid.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a method of manufacturing a mounting bracket for a cylinder device which can be easily manufactured by using a bending process.

[0018]

In order to solve the above-mentioned problems, a structure adopted by the first invention is a strip-shaped portion from a plate body and a pair of leg portions protruding from the strip-shaped portion with a predetermined distance. And a pressing step of punching them together, and after the pressing step, a curved surface portion is formed at the boundary position between the strip-shaped portion and each leg portion so as to be outwardly curved. A curved surface molding step, and after the curved surface molding step, the band-shaped portion is bent into an annular tubular portion, and a final molding step is also performed in which each leg has a flat tip end side from the curved surface portion, and the final molding step. And a mounting hole drilling step of drilling a mounting hole in each of the legs molded as a flat surface.

Further, the structure adopted by the second invention comprises a pressing step of integrally punching a strip-shaped portion and a pair of leg portions projecting from the strip-shaped portion with a predetermined distance from the plate body, After the pressing step, a cylindrical molding step of bending the strip-shaped portion into an annular tubular portion, and after the cylindrical molding step, a jig is pushed from the tip end side of each leg portion to each leg portion to form a strip shape. Forming a curved surface portion at the boundary position between the leg portion and each leg portion so as to be outwardly curved concavely, and pressing the tip end side of each leg portion to a jig to form a flat surface After the final molding step, a mounting hole drilling step of drilling a mounting hole in each of the legs molded as a flat surface is performed.

[0020]

According to the pressing step of the first aspect of the present invention, the strip-shaped portion and the pair of legs protruding from the strip-shaped portion with a predetermined distance can be integrally punched from the plate. Next, by the curved surface molding step, the curved surface portion can be formed at the boundary position between the belt-shaped portion and each leg portion so as to be concavely curved outward. next,
By the final molding step, the belt-shaped portion can be bent as an annular tubular portion, and the tip end side of each leg from the curved surface portion can be molded as a flat surface. Then, by the mounting hole drilling step, mounting holes can be drilled in each of the legs molded as a flat surface.

By the pressing step of the second invention, the strip-shaped portion and the pair of leg portions protruding from the strip-shaped portion with a predetermined distance can be integrally punched from the plate body. Next, the band-shaped portion can be bent into an annular tubular portion by a cylindrical molding process. Then, in the final molding step, a jig is pushed from the tip end side of each leg portion between the leg portions so as to be outwardly concavely curved at the boundary position between the strip portion and each leg portion. It is possible to form a flat surface by forming a curved surface portion on the base and pressing the tip end side of each leg portion against a jig. Then, by the mounting hole drilling step, mounting holes can be drilled in the respective leg portions molded as flat surfaces.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the conventional technique shown in FIGS. 10 to 16 are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 11 denotes a mounting bracket which is provided on the outer periphery of the outer cylinder 1 on the lower end side and is made of hard steel or the like according to this embodiment. The mounting bracket 11 is fitted on the outer periphery of the outer cylinder 1 on the lower end side. , A cylindrical portion 11A fixed to the outer cylinder 1 by fixing means such as welding, and a shoulder portion 11B which is symmetrically arranged at the lower end side of the cylindrical portion 11A and projects outward in the radial direction. , 11B and a pair of flat plate-shaped leg portions 11C, 11C extending downward in parallel from the tip end side of each shoulder portion 11B.
And a mounting hole 11D is formed at the lower end of each leg 11C. The mounting bracket 11 is fixed to the axle side of the vehicle by bolts (not shown) through the mounting holes 11D.

Next, a method of manufacturing the mounting bracket 11 according to the first embodiment of the present invention will be described with reference to FIGS.

First, in the pressing process, as shown in FIG.
Using a punching die (not shown) attached to a press machine from a plate material made of a hard steel material having rigidity, a rectangular or rectangular strip portion having a length dimension approximately equal to the outer peripheral dimension of the outer cylinder 1. 21 and the tongue-shaped leg portions 22, 22 which are spaced apart from the lower end side of the strip portion 21 by a predetermined dimension and extend downward in parallel are integrally punched.

Next, in the curved surface molding step, a bending die (not shown) attached to the press machine at the boundary position between the belt-shaped portion 21 and the leg portions 22 formed in the pressing step. As shown in FIG. 3, the concave curved portions 33, 33 are bent upward and downward along the outer shape of the outer cylinder 1 at the portions of the strip-shaped portion 31 located above the leg portions 32, as shown in FIG. Along with the formation, the bulging portions 34, 34 as curved surface portions are formed by bending the boundary position between the strip-shaped portion 31 and each leg portion 32 in the protruding direction of each concave curved portion 33.

Next, in the final molding step, the band-shaped portion 31 that has undergone the curved surface molding step is bent, and the tip ends of the leg portions 32 are pressed. As a result, as shown in FIG. 4, the belt-shaped portion 31 is formed into an annular tubular portion 41, each leg portion 42 is pressed, and each bulge portion 44 is left as it is to form each leg portion 42 as a flat surface. To do.

Then, in the mounting hole drilling step, a hole is formed on the tip end side of each leg portion 42 molded as a flat surface in the final molding step, and as shown in FIG. 5, the cylindrical portion 11A and the shoulder portion are formed. 11B has the same shape, and a mounting hole 11D is formed at the lower end side of each leg 11C. As a result, the mounting bracket 1
1 is completed.

The hydraulic shock absorber according to this embodiment has the above-mentioned structure, and its basic operation is not different from that of the prior art.

However, in this embodiment, the mounting bracket 1
1 by a pressing process, a strip portion 21 and a pair of leg portions 22,
22 is punched out integrally, and the band-shaped portion 31 is formed by the curved surface molding process.
The concave curved portions 33, 33 are formed in the same, and the bulging portions 34, 34 are formed between the strip-shaped portion 31 and each leg portion 32, and the strip-shaped portion 31 is formed into an annular tubular portion 41 in the final molding step. In addition to the molding, the leg portions 42 are formed as flat surfaces while leaving the bulging portions 44 as they are, and then the mounting holes 11D are formed in the lower end side of the leg portions 11C in the mounting hole forming step. There is. As a result, the mounting bracket 11 can be easily manufactured with a small number of steps.

In this way, according to this embodiment, the mounting bracket 6 can be manufactured in a smaller number of steps as compared with the manufacturing method of the mounting bracket 6 described in the prior art. Therefore, workability is improved and productivity is greatly improved. can do.

Further, the mounting bracket 11 according to the present embodiment.
In the manufacturing method of No. 1, since the deep drawing process described in the prior art is abolished and the manufacturing method is performed by bending, stress concentration due to uneven thickness occurs in the cylindrical portion 11A of the mounting bracket 11, wrinkles and cracks occur. Can be prevented, and yield and life can be significantly improved. Further, the material used for the mounting bracket 11 can be a hard steel material or the like having rigidity within a range where bending can be performed, which enhances the rigidity of the mounting bracket 11 and prevents damage from occurring, thereby significantly improving reliability. Can be improved.

Next, a method of manufacturing the mounting bracket 11 according to the second embodiment of the present invention will be described with reference to FIGS. 6 to 9.

First, in the pressing process, as shown in FIG.
Similar to the manufacturing method according to the first embodiment, a punching die (not shown) attached to a press machine from a plate material made of rigid hard steel material or the like is used, and the outer peripheral dimension of the outer cylinder 1 is about the same. A rectangular or rectangular strip portion 51 having a length dimension, and tongue-shaped leg portions 52, 52 extending in parallel downward at a predetermined distance from the lower end side of the strip portion 51.
It is created by punching and.

Next, in the cylindrical molding step, a bending process (not shown) is used to bend the strip-shaped portion 51 and each leg portion 52 formed in the pressing step, and as shown in FIG. The strip portion 51 is an annular tubular portion 61, and the leg portions 52 are leg portions 62, 62 that are curved with the same curvature as the tubular portion 61.

Next, in the final molding step, as shown in FIG. 8, a small diameter extending upward through a prismatic main body portion G1 and a truncated cone-shaped shoulder portion G2 formed on the upper end side of the main body portion G1. A molding jig G4 composed of a cylindrical columnar shaft portion G3 is pushed from the tip end side between the leg portions 62 that have been subjected to the cylindrical molding process, and each leg portion 62 is pressed through the pressing plates G5 and G5. It is sandwiched and pressed with the portion G1. As a result, a shoulder portion 73, which is located on the lower end side of the tubular portion 71 and is a curved surface portion at which the boundary position between the tubular portion 71 and each leg portion 72 is bent outward,
73 is formed, and each leg portion 72 is molded as a flat surface.

Then, in the mounting hole drilling step, a hole is formed on the tip side of each leg portion 72 molded as a flat surface in the final molding step, and as shown in FIG. 9, the cylindrical portion 11A and the shoulder portion are formed. 11B has the same shape, and a mounting hole 11D is formed at the lower end side of each leg 11C. As a result, the mounting bracket 1
1 is completed.

Thus, also in this embodiment having such a structure, the mounting bracket 1 according to the first embodiment is
It is possible to obtain substantially the same operational effects as the manufacturing method of No. 1.

In each of the embodiments described above, the mounting bracket 11 for the vehicle hydraulic shock absorber has been described as an example of the mounting bracket for the cylinder device, but the present invention is not limited to this. For example, a gas spring, a hydraulic cylinder, It can also be applied to a mounting bracket used for another cylinder device such as a pneumatic cylinder.

[0040]

As described above in detail, according to the first aspect of the present invention, in the pressing step, the strip-shaped portion and the pair of legs protruding from the strip-shaped portion with a predetermined distance from each other are integrally punched to form a curved surface. In the molding step, a curved surface portion is formed at the boundary position between the strip-shaped portion and each leg portion so as to be concavely curved outward, and in the final molding step, the strip-shaped portion is formed into an annular tubular portion. After bending and molding the tip end side of each leg from each curved surface as a flat surface, a mounting hole is drilled in each leg molded as a flat surface in the mounting hole drilling step. , The mounting bracket can be easily manufactured without using deep drawing, which can improve the productivity and prevent the production of defective thickness or damage during the manufacturing to improve the yield and the life. be able to.

According to the second aspect of the invention, in the pressing step, the strip-shaped portion and the pair of legs protruding from the strip-shaped portion at a predetermined distance from each other are integrally punched, and the strip-shaped portion is formed in the cylindrical molding step. Is bent as an annular tubular portion, and a jig is pushed between the leg portions from the tip end side of each leg portion in the final molding step to outward at the boundary position between the belt-shaped portion and each leg portion. The curved legs are formed so as to be concave curved toward each other, and the legs of the legs are pressed into a jig to form a flat surface, and then the legs are formed as a flat surface in a mounting hole drilling step. Since the mounting hole is drilled in the part, the mounting bracket can be easily manufactured without using deep drawing, which can improve the productivity and, at the same time, can prevent thickness defects during manufacturing. It is possible to prevent breakage and improve yield and life.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a hydraulic shock absorber applied to an embodiment of the present invention.

FIG. 2 is an external perspective view showing, in an enlarged manner, a state in which the strip-shaped portion and each leg portion are punched in the pressing step in the manufacturing method according to the first embodiment of the present invention.

FIG. 3 is an external perspective view showing a state in which a concave curved portion is formed in the belt-shaped portion in FIG. 2 and a bulge portion is formed at a boundary position between the belt-shaped portion and each leg in the curved surface molding step.

FIG. 4 is a front view showing a state in which the band-shaped portion in FIG. 3 is formed into an annular tubular portion and each leg portion is molded as a flat surface in the final molding step.

5 is an external perspective view showing a state in which a mounting hole is drilled in each leg portion in FIG. 4 in a mounting hole drilling step.

FIG. 6 is an external perspective view showing a state in which the strip portion and each leg portion are punched out in the pressing step in the manufacturing method according to the second embodiment of the present invention.

FIG. 7 is an external perspective view showing a state in which the strip-shaped portion in FIG. 6 is formed into an annular tubular portion and each leg portion is curved in the cylindrical molding step.

8 is a front view showing a state in which a shoulder is formed at a boundary position between the tubular portion and each leg in FIG. 7 using a molding jig or the like in the final molding step, and each leg is molded as a flat surface. It is a figure.

9 is an external perspective view showing a state in which mounting holes are drilled in each leg in FIG. 8 in a mounting hole drilling step.

FIG. 10 is an external perspective view showing a conventional hydraulic shock absorber.

FIG. 11 is an external perspective view showing, in an enlarged manner, a state in which the narrowed portion and each protruding portion are punched in the pressing step in the manufacturing method according to the conventional technique.

12 is an external perspective view showing a state in which a narrowed portion in FIG. 11 is deep-drawn into a tubular portion in a drawing step.

13 is an external perspective view showing a state in which the lid portion is cut off from the tubular portion in FIG. 12 in the lid portion cutting step.

14 is an external perspective view showing a state in which an edge portion is formed on each leg in FIG. 13 in an edge forming step.

FIG. 15 is an external perspective view showing a state in which each leg portion in FIG. 14 is bent through the shoulder portion in the leg portion bending step.

16 is an external perspective view showing a state in which mounting holes are drilled in each leg portion in FIG. 15 in a mounting hole drilling step.

[Explanation of symbols]

 11 Mounting bracket 11A, 41, 61, 71 Cylindrical part 11B Shoulder part 11C, 22, 32, 42, 52, 62, 72 Leg part 11D Mounting hole 21, 31, 51 Band part 34, 44 Swelling part (curved surface part) ) G4 molding jig

Claims (2)

[Claims] 1. A pressing step of integrally punching a strip-shaped portion and a pair of legs protruding from the strip-shaped portion with a predetermined distance apart from each other, and the strip-shaped portion after the pressing step. A curved surface molding step of forming a curved surface portion so as to be outwardly concavely curved at a boundary position between each leg portion, and after the curved surface molding step, the strip portion is formed into an annular tubular portion. A final molding step of bending and molding the leg tip end side from each curved surface as a flat surface, and a mounting hole for forming a mounting hole in each leg molded as a flat surface after the final molding step A method of manufacturing a mounting bracket for a cylinder device, which comprises a drilling step. 2. A pressing step of integrally punching a strip-shaped portion and a pair of legs protruding from the strip-shaped portion with a predetermined distance apart from each other, and the strip-shaped portion is pressed after the pressing step. A cylindrical molding step of bending as an annular tubular portion, and a boundary between the strip-shaped portion and each leg portion by pushing a jig between each leg portion from the tip end side of each leg portion after the cylindrical molding step. While forming a curved surface portion in a position so as to be concavely curved outward, a final molding step of pressing the tip end side of each leg into a jig to form a flat surface, and after the final molding step, A method of manufacturing a mounting bracket for a cylinder device, which comprises a mounting hole drilling step of drilling a mounting hole in each of the legs molded as a flat surface.