JPH0518663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for manufacturing a cylindrical member with a flange, and more specifically, a flange in which a flange is integrally formed at one end of a cylindrical part by extrusion using plastic flow from a workpiece. The present invention relates to a method of manufacturing a cylindrical member.

Prior Art Conventionally, this type of member 41 has been manufactured, for example, as follows. That is, as shown in FIG. 13, the cylindrical member 42 and the flange member 43 are manufactured separately from plate materials by press working, and after manufacturing, the flange member 43 is fitted to the end of the cylindrical member 42, as shown at 42a in the figure. I was trying to caulk and connect them like that.

Problems to be Solved by the Invention However, in the structure described above, the flange member 43 and the cylindrical member 42 are manufactured and then caulked together, which requires a large number of machining steps and a large number of parts, which causes an increase in costs. Ta. Another problem was that the strength of the caulked joint was not sufficient. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a flanged cylindrical member that is integrally molded as one piece by extrusion processing in order to solve the above-mentioned problems.

Means for Solving the Problems In order to achieve the above object, the present invention is configured such that a flanged cylindrical member is integrally manufactured by causing plastic flow in a workpiece by extrusion molding. That is, the cavities formed in the pair of molds house a solid workpiece having the same diameter and axial dimensions as the shaft portion of the flanged cylinder member, and In the manufacturing method, the workpiece is extruded by pushing a ram into the cavity, and the cavity includes a rod-shaped space for storing a rod-shaped solid workpiece, and a radial space around one axial end of the rod-shaped space. By storing a rod-shaped solid workpiece in the rod-shaped space of the cavity and pushing the ram into the center of the workpiece, the ram and the mold are connected. At the same time a cylindrical portion is formed in between, a part of the workpiece is made to plastically flow into the flange-shaped space to integrate a thin-walled flange with the cylindrical portion in a radial direction that intersects with the axial direction of the workpiece. It was designed to be extruded.

Effects and Effects of the Invention According to the above configuration, at least one end in the axial direction of the solid workpiece having the same diameter dimension and the same axial dimension as the shaft part of the flanged cylindrical member is pressed, and the recess is formed by press forming. At the same time, since a thin-walled flange is formed by extending radially from either the one end or the other end, the thin-walled flange can be integrally formed with the cylindrical part, and the flange can be integrally formed with the cylindrical part. There is no need to caulk, which reduces the number of machining steps and the number of parts, leading to cost reductions, and since there is no caulking part and the flange and cylinder part are integrated, the strength of the joined part is also sufficient.

Further, by generating plastic flow into the flanged space at either end of the workpiece, a thin flanged portion protruding in the radial direction can be reliably formed at the end.

In addition, since the thin flange is integrally molded into the cylindrical part by extrusion molding using plastic flow, manufacturing operations can be carried out with low load, and the equipment capacity for extrusion molding can be small.

Embodiments Below, embodiments of the present invention will be specifically described based on the drawings.

The method for manufacturing the flanged cylindrical member 6 according to the present embodiment is to produce a cylindrical solid workpiece 1 made of metal or synthetic resin by extrusion, at either end 1 in the axial direction.
The disk-shaped collar portions 2 are integrally molded on b and 1c, respectively.

That is, first, as shown in FIG. 1a, small recesses 1a, 1a are formed at both axial ends 1b, 1c of a cylindrical solid workpiece 1, which has the same diameter and axial dimensions as the cylindrical portion 3 of the product 6. , and the cylindrical solid workpiece 1
At the same time, a lubricant is held in each of the small recesses 1a so that subsequent extrusion molding can be carried out smoothly.

Next, the workpiece 1 is set in an extrusion molding apparatus as shown in FIG.
As shown in FIG.
At the same time, a disk-shaped flange 2 is formed in the radial direction on the outer circumferential surface near the one end. That is, in FIGS. 3 and 4, the workpiece 1 is stored in the circular hole 7c of the lower die 7, and the upper die 8 is lowered relative to the lower die 7 to form the small circular hole of the upper die 8. The upper end of the workpiece 1 is fitted into the recess 8d, and the workpiece 1 is brought into close contact and pressure contact with the circular hole 7c and the small circular recess 8d. At the bottom of the circular hole 7c of the lower die 7,
An eject pin fitting hole 7b having a smaller diameter than the hole 7c and communicating with the hole 7c is formed along the axial direction of the workpiece, and an eject pin 9 is inserted into the hole 7b.
Fit together so that they can move up and down. Also, upper die 8
An upper ram fitting hole 8b is formed along the axial direction of the workpiece at the bottom of the small circular recess 8d.
The upper ram 10 is fitted into the upper ram 10 so as to be vertically movable. Further, on the mating surfaces of the upper dies 8 and 7, small annular recesses 8a and 7a projecting in the radial direction are formed on the outer periphery of the upper end of the workpiece 1 in the axial direction, respectively, to form a circular gap 13 for forming a flange. Therefore, the rod-shaped space formed by the circular hole 7c and the small circular recess 8d and the collar-shaped space formed by the circular gap 13 constitute a forming cavity.

The upper ram 10 is pushed into the upper end 1b of the workpiece 1 in the axial direction as shown in FIG.
At the same time, the workpiece 1 of the upper and lower dies 8, 7 is formed to form the circular recess 4 toward the lower end from
A part of the workpiece 1 is caused to flow into the circular gap 13 formed near the upper end 1b by plastic flow while being guided by the circumferential surface of the ram, thereby forming the disc-shaped collar part 2. In this plastic flow, the circular gap 13
At the openings of the dies 7 and 8, annularly protruding lands 7d and 8c as shown in FIG. Therefore, the frictional resistance during extrusion molding of the flange portion is reduced to improve moldability, and the inner portions 7e, 8 of the lands 7d, 8c are
E is formed into a curved shape to reduce dead metal.

When the flange 2 is formed on the upper end 1b of the cylindrical part of the workpiece 1 as described above, after the ram 10 is extracted from the recess 4 of the workpiece 1, the upper die 8 is While being raised, the workpiece 1 is extracted from the circular hole 7c of the lower die 7 by the eject pin 9, and the workpiece 1 is transported to the next process. Note that a draft angle is formed at the tip of the ram 10 to facilitate extraction from the recess 4.

Next, as shown in FIG. 1c, the workpiece 1 is
A through hole 5 is formed by passing through the recess 4 in the axial direction.

Next, Fig. 1d and Fig. 2, which is a plan view thereof,
As shown in the figure, each flange part 2 is
A plurality of notches 2a are provided on the outer periphery of the material, and the material is molded into a predetermined shape.

Therefore, by sequentially performing the above steps ~, it is possible to manufacture the cylindrical member 6 in which the flange portion 2 of a predetermined shape is formed on the one end portion 1b of the cylindrical portion.

According to the above embodiment, the central part of one end 1b of the workpiece 1 is pushed in the axial direction, and the end 1b is
At the same time, a disc-shaped flange 2 is formed that protrudes radially on the outer periphery of the end 1b due to plastic flow.
is stretch-molded and passed through the recess 4 in the axial direction,
Since the flanged cylindrical member 6 is manufactured by molding the flanged portion 2, the flanged portion 2 can be molded integrally with one end of the cylindrical portion 3, and the flanged portion and the cylindrical portion, which have been manufactured separately, can be caulked and connected. This reduces the number of steps and improves production efficiency, and since the flange and cylinder are integrated into one piece, the number of parts is reduced and costs are reduced.

Further, since the flange portion 2 and the cylindrical portion 3 are integrally molded, there is no caulking connection portion, and the joint portion between the flange portion 2 and the cylindrical portion 3 can have sufficient strength.

In addition, the flange 2 is integrally formed with the cylindrical part 3 by extrusion molding that utilizes plastic flow, and the plastic flow is guided on the outer peripheral surface of the ram 10, so manufacturing operations can be carried out satisfactorily with low load. , equipment capacity can be small, and processing limits can be improved.

In addition, a small recess 1a is formed in one axial end 1b of the cylindrical solid workpiece 1, and the surface of the cylindrical solid workpiece 1 is lubricated and the lubricant is retained before extrusion molding. Adopting the enclosed lubrication method ensures sufficient lubrication and allows for smooth extrusion molding.

Furthermore, the shape of the flange 2 can be controlled by the inner diameter dimension, axial dimension, and flange wall thickness dimension of the recess 4 formed in the one end 1b, and the shape of the shank 2 can be controlled with respect to the diameter dimension D of the disc-shaped flange 2. The ratio D/d of the outer diameter dimension d of is 3
It can be done to a certain extent. In other words, for those whose flange is formed by conventional compression processing,
Since the compression area becomes larger, the load becomes higher and the equipment capacity also becomes larger. Moreover, the processing limit D/d ratio could only be made up to about 2.2.

Note that the present invention is not limited to this example, and can be implemented in various other ways. for example,
As shown in FIGS. 6 and 7, the lower end 1c of the workpiece 1
While forming the smaller concave portion 4, the flange portion 2 may be formed at the upper end portion 1b. That is, the cylindrical ejector 11 is fitted into the eject pin fitting hole 7b of the lower die 7 so as to be vertically movable, and the ram 12 is fitted into the hole 11a of the ejector 11 so as to be vertically movable. On the other hand, the upper die 8' is not provided with a ram. According to the above configuration, the workpiece 1 is transferred to the lower die 7
and the upper end thereof is fitted into the circular recess 8d of the upper die 8' to form the circular hole 7c.
After the workpiece 1 is brought into close contact and pressure contact with the small circular recess 8d, of the ejector 11 and the ram 12 that were in contact with the lower end surface of the workpiece 1, only the ram 12 is raised, and the workpiece 1 is brought into contact with the workpiece 1. At the same time as forming the recess 4 upward, the circular gap 1 around the upper end of the workpiece 1 is formed.
A part of the workpiece 1 is caused to flow into the chamber 3 by plastic flow to form the disc-shaped flange 2. After extrusion molding is completed, the ram 12 is lowered to eject the material from the recess 4 of the workpiece 1, and then the upper die 8' is raised and the ejector 11 is raised to eject the material from the circular hole 7c of the lower die 7. Discharge the processed material 1.

Further, as shown in FIGS. 9 to 12, the pair of upper and lower first and second rams 34 and 32 are simultaneously pressed against the workpiece 1 to form the recesses 24 and 25, and at the same time the flange 29 is pressed against the workpiece. It may be formed at one end of 19. That is, first, as shown in FIG. 8a, the cylindrical portion 21 of the product 20 is
Small recesses 1a, 1a are formed at both axial ends 1b, 1c of a cylindrical solid workpiece 19 having the same diameter and axial dimension, and on the surface of the cylindrical solid workpiece 19. A lubrication treatment is performed and a lubricant is held in each of the small recesses 1a so that subsequent extrusion molding can be carried out smoothly.

Next, the workpiece 19 is set in an extrusion molding apparatus as shown in FIG. 10, and recesses 2 are formed at both axial ends 1b and 1c as shown in FIG. 8b.
4 and 25, respectively, and at the same time, the upper end portion 1b
A disc-shaped flange 29 is formed in the radial direction on the outer circumferential surface of the vicinity.
form. That is, in FIGS. 10 and 11, the workpiece 19 is fitted into the circular hole 30a of the lower die 30, and the lower die 30
The upper die 31 is lowered to fit the upper end of the workpiece 19 into the small circular recess 8d of the upper die 31, and the workpiece 19 is tightly and pressure-welded between the circular hole 30a and the small circular recess 8d. do. Above lower die 30
A cylindrical ejector 11 is provided in the circular hole 30a.
The ram 32 is fitted into the hole 11a of the ejector 11 so as to be vertically movable. The upper end 32a of this ram 32 is formed with a truncated conical pressing portion. On the other hand, the ram 34 is fitted into the ram fitting hole 8b of the upper die 31 so as to be vertically movable. Therefore, the small circular recess 8a and the ram 32
The rod-shaped space and the flange-shaped space formed by the circular holes 30a above each upper end surface of the ejector 11 constitute a cavity. Note that parts having the same functions as those in the previous embodiment are designated by the same reference numerals, and description thereof will be omitted.

Both the rams 34, 32 are axially pressed against both ends 1b, 1c of the workpiece 19 as shown in FIG.
At the same time, a part of the workpiece 19 is flowed into the circular gap 13 formed near the upper end 1b of the workpiece of the upper and lower dies 31 and 30 by plastic flow while being guided by the ram peripheral surface. In this way, a disk-shaped flange portion 29 is formed. In this plastic flow, the lands 8c and 7 protrude in an annular shape as in the previous embodiment at the opening of the circular gap 13.
d, and a so-called gap 14 is provided between the inner end surfaces of lands 8c and 7d and the gap wall surface.

When the flanges 29 are formed on the upper end 1b of the workpiece 19 as described above, both the rams 34 and 32 are extracted from the recesses 24 and 25 of the workpiece 19, and then as shown in FIG. , the upper die 31 is raised, the ejector 11 extracts the workpiece 19 from the circular hole 30a of the lower die 30, and the workpiece 19 is transported to the next process. Note that a draft angle is formed at the tip of each ram 34, 32, making it easier to pull out from each recess 24, 25.

Next, as shown in FIG. 8c, the workpiece 1 is
9 through both the recesses 24 and 25 to form the through hole 2.
6, a serration 27 is formed on the inner peripheral surface of the through hole 26, and a pair of mounting holes 28, 2 are formed in the vicinity of the through hole 26 of the flange 27.
8 is passed through to form the outer shape of the flange portion 29.

Therefore, by sequentially performing the above steps ~, it is possible to manufacture the cylindrical member 20 in which the flange 29 of a predetermined shape is formed on the one end 1b. This embodiment also provides the same effects as the previous embodiment.

Further, the recess 4 or the recesses 24 and 25 are
It is not necessary to form a through hole through each of them. Furthermore, the shape of the flange portion and the cylinder portion is not limited to a circular shape, but may be a square shape.

[Brief explanation of the drawing]

Figures 1 a to d are process diagrams showing a method for manufacturing a cylindrical member with flanges according to an embodiment of the present invention, Figure 2 is a plan view of Figure 1 d, and Figures 3 and 4 are extrusion molding, respectively. 5 is an enlarged sectional view of the main part of the land portion in FIG. 4, and FIGS. 6 and 7 are sectional views of the main parts of the extrusion molding apparatus before and after the start, and FIGS. 6 and 7 show manufacturing methods according to other embodiments, respectively. FIGS. 8a to 8c are enlarged cross-sectional views of main parts showing the state before and after the extrusion molding starts and ends in the extrusion molding apparatus for carrying out the extrusion molding process; FIGS. Figures a and b are plan views of Figures 8b and 8c, respectively, and Figures 10 to 12 are the extrusion molding apparatus used to carry out the manufacturing method of Figure 8 before and after extrusion, and of the molded product. FIGS. 13a and 13b are a sectional view of a main part showing a discharge state, and a plan view and a side view of a conventional flanged cylinder member, respectively. 19... Work material, 2, 29... Flange, 3, 2
1... Cylinder part, 4, 24, 25... Recessed part, 5, 26
...Through hole, 6,20...Cylindrical member with flange, 7,3
0... lower die, 8, 31... upper die, 9... ejector pin, 10... upper ram, 11... ejector, 12... ram, 13... gap, 14... nigga, 27... serration, 28...Mounting hole, 3
4, 32...first and second rams.

Claims (1)

[Scope of Claims] 1. A solid workpiece having the same diameter and axial dimensions as the shaft of a flanged cylindrical member is housed in a cavity formed in a pair of molds, and a ram is inserted into the cavity. The manufacturing method includes extrusion molding the workpiece by pushing the workpiece into the mold, and the cavity includes a rod-shaped space for storing the rod-shaped solid workpiece, and a flange-shaped radially protruding around one axial end of the rod-shaped space. By storing a rod-shaped solid workpiece in the rod-shaped space of the cavity and pushing the ram into the center of the workpiece, a cylindrical part is created between the ram and the mold. At the same time as forming, a part of the workpiece is made to plastically flow into the flange-shaped space, and a thin-walled flange is integrally press-formed with the cylindrical part in a radial direction that intersects with the axial direction of the workpiece. A method for manufacturing a flange-equipped cylindrical member, characterized in that: