JPH0353055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of manufacturing a flange-equipped cylindrical member, and more particularly to a method of manufacturing a flange and a cylindrical member integrally.

Conventionally, flanged cylindrical members have been used in various places, for example, as shown in FIG. 7, in the steering wheel of an automobile, the wheel ring 6
It is used when connecting to a steering shaft (not shown) via spokes 4. That is, the flange 3 is welded to the cylindrical boss 5 connected to the steering shaft as shown by 8 in FIG. 8, and the spokes 4 are welded to the flange 3.

However, in the flanged cylindrical member with the above structure,
Since the flange and the cylindrical boss are manufactured separately and then welded together, the manufacturing and installation work becomes complicated and costs increase, and the heat during welding causes distortion in the cylindrical boss, making installation difficult. There was a problem with poor accuracy.

To solve this problem, there is a device in which the cylindrical boss portion and the flange portion are integrally formed by drawing from a plate material.

However, according to this method, at the boundary between the flange and the cylindrical boss, it is necessary to make the wall thickness of the cylindrical boss larger than that of the flange to ensure sufficient strength. There are problems in that it is difficult to control the wall thickness and the strength of the boundary portion is insufficient.

Another method of integrally forming the material without welding is to manufacture it from plate material or hollow material by compression processing, but there are certain limits to compression processing, and the material cannot be used due to compression. There was a problem in that it was necessary to apply a high load to the system, and a large equipment capacity was required.

OBJECTS OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide a method for manufacturing a flange-equipped cylindrical member in which a cylindrical boss portion and a flange portion are integrally formed from a plate material by extrusion processing. It's about doing.

Structure, operation, and effect of the invention In order to achieve the above object, the present invention forms a boss portion and a pair of rising portions from a plate-shaped workpiece by extrusion processing, and then presses and bends the pair of rising portions. It was configured to be flattened to form a flange. That is, by extrusion processing, a cylindrical part is made to protrude in a direction perpendicular to the plate surface at a predetermined location on one plate surface of a plate-shaped workpiece to form a boss part, while the opposite end of the plate surface is made to protrude in a direction perpendicular to the plate surface. a step of forming a pair of rising portions by making them stand up on the other board surface, and pressing and bending the pair of rising portions approximately along the board surface to flatten them, and causing the flange to protrude from the boss portion. The structure is such that the steps of forming the wafer are sequentially performed.

In the present invention, in the pressing and bending process of the pair of rising parts, the flange part may be formed simultaneously or in the next process, and the through hole may be formed in the boss part simultaneously or successively. Good too. Further, the projecting shape of the flange portion does not necessarily have to be symmetrical with respect to the boss portion.

According to the above configuration, on one plate surface, the cylindrical portion is made to protrude to one side in the axial direction of the plate surface, and at the same time, on the other plate surface, a pair of rising portions are made to protrude to the opposite side in the direction perpendicular to the plate surface, so that the pair of rising portions The rising dimension of the part is sufficient to form the flange, and the flange with the desired mounting space can be reliably formed integrally. On the other hand, if you try to extend the flange directly along the plate surface of the workpiece instead of the pair of rising parts, the workpiece will be stretched in a direction perpendicular to the direction in which the cylindrical part is formed (direction perpendicular to the plate surface). As a result, a sufficient stretching dimension cannot be obtained, making it difficult to form a flange with a desired mounting space.

According to this stretching method, the original width dimension l of the workpiece material
If the dimension after stretching is L, then l:L=1:
It is about 2.2. On the other hand, according to the present invention,
If the width of the flange when the rising part is formed and then pressed and bent to form the flange is L', then l:L'=
The ratio is 1:3 or more, and a flange with sufficient space can be formed.

In addition, since the flange can be integrally molded by extrusion, there is no need to weld the flange to the shaft, reducing processing steps and the number of parts, reducing costs, and eliminating distortion caused by heat during welding. High precision products can be manufactured.

In addition, while the cylindrical portion is made to protrude from a predetermined location on the plate surface, the pair of rising portions are formed at opposite ends of the plate surface, so the thickness of the cylindrical portion (boss The wall thickness of the part) is increased, and sufficient strength can be provided at the boundary between the flange part and the boss part.

In addition, the flange is integrally formed with the boss using a composite extrusion process that forms a rising part and a cylindrical part in the direction perpendicular to the plate surface, making it possible to perform manufacturing operations with low loads and with a small equipment capacity. Anything is fine.

Embodiments The present invention will be specifically described below based on illustrated embodiments.

The manufacturing method of the flanged cylindrical member according to the present embodiment includes forming a boss portion 12 and a pair of rising portions 13, 13 by extruding a plate-shaped workpiece 10, and then pressing the pair of rising portions 13, 13. Bending and flattening the flange part 1
9.

That is, first, the square plate-shaped workpiece 10 shown in FIG. 1a and FIG. 2a is subjected to composite extrusion processing, and then
As shown in FIG. 2b, a boss portion 12 is formed on one plate surface 10a, and a boss portion 12 is formed on the other plate surface 10a.
A pair of rising portions 13, 13 are formed at the same time on 0b. That is, the thick cylindrical part 11 having the circular recess 15 is formed to protrude from the approximate center of the one plate surface 10a in the direction perpendicular to the plate surface to form the boss part 12, while the opposite ends of the other plate surface 10b are formed. is raised in the direction perpendicular to the plate surface and on the opposite side to the protruding side of the cylindrical portion, thereby forming a pair of rising portions 13, 1.
form 3. Approximately at the center of the other plate surface 10b, a small circular recess 1 is provided corresponding to the recess 15.
form 4.

Next, as shown in FIG. 1c and FIG. 2c,
The pair of rising portions 13, 13 are pressed and bent in a direction away from each other so that they are located approximately along the plate surface, thereby approximately forming the flange portion 19. That is, the above-mentioned work is carried out using the pressing and bending apparatus shown in FIGS. 3, 4, and 5. In this device, die 22
A concave groove 22a extending from the opening of the machining chamber 22c is provided on the bottom surface of the machining chamber 22c.
The cylindrical portion 11 of the workpiece 10 is inserted into this groove 22a.
are fitted and inserted into the processing chamber 22c. Then, upper end portions 23c, 23 are inserted into guide grooves 22b, 22b recessed in the upper portions of both side walls of the processing chamber 22c.
The punch 23 is inserted into the processing chamber 2 while fitting and guiding the
Insert into 2c. A narrow portion 23a is formed at the lower end of the punch 23, and the narrow portion 23a is inserted between the rising portions 13, 13 of the workpiece 10.

Further, from both side surfaces to the bottom surface of the punch 23, as shown in FIG. 6, a conical curved surface 23b whose diameter gradually increases from the tip to the base.
form. Narrow width part 23a at the tip of the punch
A pair of rising parts 13, 1 of the plate-shaped workpiece 10
3, the punch 23 is advanced and the conical curved surface 23b forms each rising portion 1.
3 is gradually pressed and bent as shown by the arrows in FIG. 5, and gradually flattened so as to be substantially flush with the plate surface, thereby roughly forming the flange 19.

Next, as shown in FIG. 1 d and FIG. 2 d,
A pair of rising portions 13 that are pressed and bent to make them flat;
13 and the plate surface are corrected by pressing to form a flange portion 19 which is a single flat plate.

Next, as shown in FIG. 1e and FIG. 2e,
A boss hole 16 is formed by penetrating the small recess 14 and the recess 15 of the boss 11, and a serration 17 is formed above the boss hole 16, while a pair of mounting holes 18 are formed near the boss of the flange 19.
18, and the outer shape of the flange portion 19 is shaped into a hexagonal plate shape.

Therefore, the flanged cylindrical member can be manufactured by sequentially performing the above steps.

According to the above embodiment, by the composite extrusion process, the cylindrical part 11 is made to protrude from one plate surface 10a of the plate-shaped workpiece 10 to form the boss part 12, and at the same time, the boss part 12 is formed on the other plate surface 10b. Since the pair of rising portions 13, 13 are formed, a sufficient rising dimension of each rising portion 13 can be obtained, and a wide flange portion 19 can be reliably formed.

Further, since the rising portions 13 are gradually pressed and bent with the punch 23 to flatten them, the flange portion 19 can be reliably formed without overloading the connection portion between each rising portion 13 and the plate surface.

Furthermore, since the cylindrical portion 11 and the pair of rising portions 13, 13 can be formed simultaneously on both sides of the plate-shaped workpiece 10, and the boss portion 12 and the collar portion 19 can be integrally formed, they can be manufactured separately. The step of welding the flange portion 19 and the boss portion 12 can be omitted, and the number of steps and the boss portion 12 are integrated into one piece, reducing the number of parts and reducing costs. Distortion can be prevented and product accuracy improved.

In addition, since the flange 19 and the boss 12 are integrally molded, there is no welded part, and the flange 19 and the boss 12 are integrally molded.
The joints can provide sufficient strength.

In addition, by composite extrusion processing, one plate surface 10a
The cylindrical portion 11 is made to protrude from approximately the center to form the boss portion 12, and at the same time, rising portions 13, 13 are formed at both ends of the other plate surface 10b, and then these pair of rising portions 13, 13 are pressed and bent. The thickness of the flange 19 is always smaller than that of the boss 12.
Sufficient strength can be provided to the boundary between the flange 19 and the boss 12, and the ratio L/l of the original width l of the workpiece 10 to the width L of the flange 19 can be increased to 3 or more. be able to. In other words, when the flange is formed by conventional compression processing, the compression processing is performed under high load, so there is a processing limit and the equipment capacity becomes large, and the L/L ratio can only be achieved up to about 2.2. It is.

Furthermore, since the flange part 19 is integrally formed with the boss part 12 by composite extrusion processing, the manufacturing operation can be carried out sufficiently with a low load, and the capacity of the equipment is also small.

Note that the present invention is not limited to this example, and can be implemented in various other ways. for example,
The shape of the plate-shaped workpiece 10 is not limited to a square, but may be a rectangle or any polygon, or may be an ellipse, a circle, or the like.

[Brief explanation of drawings]

1A to 1E are process explanatory diagrams of a manufacturing method according to an embodiment of the present invention, 2A to 2E are plan views of 1A to 1E, and 3 and 4 are extrusion diagrams, respectively. 3--line sectional view of the processing device; FIGS. 5(a) and 5(b) are respectively FIG. 3--line sectional view and FIG. and a front view, and FIGS. 7 and 8 are explanatory views of a case where a conventional flanged cylindrical member is applied to a handle, and a cross-sectional view of the above-mentioned member. 10... Work material, 11... Cylindrical part, 12...
Boss part, 13... rising part, 19... collar part.

Claims (1)

[Claims] 1. By extrusion processing, a cylindrical portion is formed at a predetermined location on one plate surface of a plate-shaped workpiece in a direction perpendicular to the plate surface to form a boss portion, while a boss portion is formed at the opposite end of the plate surface. a step of forming a pair of rising portions by rising up in a direction perpendicular to the plate surface and toward the other plate surface, and pressing and bending the pair of rising portions approximately along the plate surface to flatten the flange portion. A method for manufacturing a cylindrical member with a flange, comprising sequentially performing the steps of forming the member so as to protrude from a boss portion.