JPH0810893A - Manufacture of cylindrical body with flange - Google Patents

Abstract

PURPOSE:To improve the rationalization of a forming die and to improve the workability at the time of forming, in a method for plastically manufacturing a cylindrical body with flanges with the flanges protruded at both end parts of the cylindrical body. CONSTITUTION:A pair of a first and a second dies 3a, 3b provided with end surface forming recessed parts 31 for forming end surface shapes having flanges E are arranged opposite each other. A pressurizing shaft part 33 is protruded from the end surface forming recessed part 31 of a second die 3b and a disk-like forming roller 4 is arranged at the center periphery of a first die 3a. The forming roller 4 is pushed toward the inner part while rotating the dies with a blank 10 interposed between them, and slit-opening the blank 10 into two parts F0 corresponding to a pair of flange. The pressurizing shaft part 33 is pushed to the blank 10 in the rotating condition and the blank to be extruded is grown toward the second die 3b side by this pushing to form the cylinder corresponding part 101. Ironing is applied to this part 101 by the forming roller 4 to finish the cylinder part. The flange corresponding parts F0 are pressurized to the end surface forming recessing parts 31 to finish the flanges F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a flanged tubular body, in particular, a flanged tubular body such as a bicycle hub body having flanges projecting at both ends by plastic working (hot working). It is about.

[0002]

2. Description of the Related Art As a conventional method of manufacturing the above-mentioned bicycle hub body, a backward extrusion step (a) shown in FIG. 2 is applied to a thick disk-shaped workpiece (10) as shown in FIG. A plurality of plastic working processes such as punching process (b), forward extrusion process (c), and upsetting process (d) are sequentially performed to form a tubular body having a flange (F) formed at one end, as shown in FIG. like,
After processing to mold the other flange (F), the flanges (F) and (F) are finally attached to both ends of the cylinder (1) as shown in the figure.
There is one that is molded into a shape in which each is continuously provided.

However, this method has a problem in that it is not possible to rationalize the mold, because a mold corresponding to each molding shape is required for each of the above steps. or,
Since the material to be processed (10) must be sequentially set in the mold of the next process, there is a problem that its workability is poor.

[0004]

[Technical Problem] The present invention has been made in view of the above circumstances, and is described in "Blocking a tubular body with a flange in which flanges (F) (F) are projected at both ends of the tubular portion (1). In the manufacturing method of the flanged cylinder of the type that is formed by plastic working from the material to be processed (10), it is an object to rationalize the mold required for forming and to improve the workability of this forming. To do. [Invention of Claim 1]

[0005]

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problems is a pair of first and second end face forming recesses (31) for forming an end face shape including a flange (F). Second
The molds (3a) (3b) are opposed to each other, and the pressing shaft part (33) is projected from the center part of the end face forming recess (31) of the one second mold (3b),
Disc-shaped forming roller (4) on the outer periphery of the other first mold (3a)
And place. The material to be processed (10) housed in the end face forming recess (31) of the first mold (3a) is clamped by the pressure shaft (33) of the second mold (3b) to rotate these molds. While pushing the forming roller (4) into the material to be processed (10) and cleaving the outer peripheral surface of the forming roller (4) up to a certain depth into a pair of flange corresponding parts (F ₀ ) (F ₀ ). Simultaneously with or after completion of this cleaving step, the pressing shaft portion (33) is pushed into the workpiece material (10) in the mold rotating state and pushed out to the outer peripheral side, and the extruding material is pushed into the pressing shaft portion (33). ) And the molding roller (4) to grow to the side of the second mold (3b) to mold into a cylinder-corresponding part (101), and. A step of performing ironing with the forming roller (4) on the cylinder equivalent part (101) to finish the cylinder part (1) following the pressing shaft part (33); And a step of applying pressure to the corresponding flanges (F ₀ ) (F ₀ ) to the corresponding end face forming recesses (31) (31) to finish the flanges (F) (F) ''. .

[0006]

The above technical means of the present invention operates as follows. In this product, first, the end surface forming recess of the first mold (3a)
The material (10) to be processed is housed in (31) and is pressed by the pressing shaft portion (33) of the second mold (3b). Then, when the forming roller (4) is pushed into the material to be processed (10) while rotating these molds, the outer peripheral surface of the forming roller (4) is cleaved to a certain depth, and a pair of flange equivalent parts (F ₀ ) (F ₀ ) Is molded.

Simultaneously with or after completion of the cleaving step, the pressing shaft portion (33) is processed into a material to be processed in the mold rotating state.
When pushed into (10), the raw material is pushed out to the outer peripheral side of the pressure shaft portion (33), and at this time, the first die (3a) side portion of the work material (10) is formed into the end face forming recess (31) and Since the outer circumference is restrained by the forming roller (4), the material to be extruded grows from the space between the pressure shaft portion (33) and the forming roller (4) to the second mold (3b) side. It is molded into a cylinder-corresponding portion (101).

After that, when the cylindrical portion (101) is ironed by the forming roller (4), it is pressed by the pressure shaft (33).
It is spread out in the same manner as the above and finished into the cylindrical part (1). Further, the flange corresponding portion (F ₀ ) (F ₀ ) is pressed by the forming roller (4) to the end face forming concave portions (31) (31) to be finished as the flange (F) (F). With this product, as described above, the first and second molds (3
The material to be processed (10) set between a) and (3b) is molded into the final shape as it is.

[0009]

[Effects] The present invention having the above-described structure has the following unique effects. This is the material to be processed set between the dies
Since (10) is molded into the final shape as it is, the workability of molding is improved as compared with the above-mentioned conventional example in which the work material (10) needs to be detached during the molding. Also, with this one,
Molds required for molding are only the first and second molds (3a) and (3b), so compared with the above-mentioned conventional mold that requires multiple sets of molds according to the molding stage. Is reduced in number. [Invention of Claim 5] In the invention of Claim 5, the flange-corresponding portion (F) on the second mold (3b) side formed by cleavage is used.
( ₀ ) is made to be close to the flange (F) so that the finishing work after this can be reduced.The technical means for that is to use the "working material (10) of the forming roller (4) It is configured such that the pressing shaft portion (33) is pushed into the workpiece material (10) substantially at the same time as the start of dehiscence. "

In this case, when the material to be processed (10) is torn by the forming roller (4), the pressing shaft portion (33) starts to be pressed into the material to be processed (10) at about the same time as the start of the cleavage. From the above, the tearing progresses while the material extruded by the pressing shaft portion (33) is supplied to the base end portion of the flange corresponding portion (F ₀ ) on the second die (3b) side. As a result, the flange equivalent portion (F ₀ )
Does not have a shape inclined to the second mold (3b) side, but has a posture substantially perpendicular to the axis. As a result, the flange-corresponding portion (F ₀ ) has a shape similar to that of the flange (F), and the processing for finishing the subsequent flange (F) is reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. [Example 1] Example 1 was carried out to manufacture a winding drum (D) for winding and holding a wire as shown in Fig. 4, and a molding apparatus used for this is
As shown in FIG. 5, the above-mentioned second and first molds (3b) and (3a) are opposed to each other in the vertical direction and the lower first mold (3a) supported so as to be rotationally driven at a fixed position. The upper second die (3b) is supported so as to be rotatable synchronously with the first die (3a) and capable of descent drive. As shown in FIG. 4, the winding drum (D) has a shape in which both end edges of the tubular portion (1) and the outer surfaces of the flanges (F) (F) are flush with each other.

[Construction of each part of the molding apparatus] The first
As shown in FIG. 5, the second molds (3a) and (3b) are both formed in a thick disk shape, and the end faces of the winding drum (D) including the above flanges (F) are formed on the opposing end faces. In order to shape the shape, the end surface forming recess (31) with a constant depth that matches the shape of this end surface
Is provided. The pressure shaft (33) projects downward from the center of the end face forming recess (31) of the one second mold (3b), and the diameter of the pressure shaft (33) becomes the inner diameter of the cylinder (1). , The length is set to be slightly smaller than that of the tube section (1). Further, the lower end surface of the pressing shaft portion (33) is a conical surface with a large angle, which allows the pressing shaft portion (33) to be pressed into the workpiece material (10) on the outer peripheral side of the material. The extrusion to is smooth.

And, the end face forming concave portion of the first mold (3a)
A disk-shaped forming roller (4) is arranged on the outer peripheral side of (31), and a support body (6) with a U-shaped cross section that rotatably supports the roller (6).
By this, it is possible to move in any direction in the radial direction and the vertical direction. Also, the cross section of the outer peripheral portion of this forming roller (4) is
It is almost semi-elliptical. The supporting shaft (36) protruding from the lower end surface of the first mold (3a) and the supporting shaft (35) protruding from the upper end surface of the second mold (3b) are separately driven to rotate. It is connected to a device (not shown) and these first and second molds (3a) (3
b) is configured to rotate synchronously. Also, the second mold (3b)
Is configured to be driven downward including the rotary drive device thereof. In addition, these first and second molds (3a) (3b)
Known mechanisms are used as the supporting mechanism of (1) and the supporting mechanism of the forming roller (4).

[Practice of Molding] Next, the practice of manufacturing the winding drum (D) from the material (10) to be processed using the above-mentioned molding apparatus will be described in detail below. The material to be processed (10) is made of a substantially disc-shaped aluminum alloy, the diameter of which is substantially the same as that of the flange (F), and the wall thickness is 2 times that of the flange (F). It is set to slightly larger than double.

Then, as shown in FIG. 5, one end of the material to be processed (10) is an end face forming recess (31) of the first die (3a).
The second mold (3b) while allowing it to be housed in the
Is driven downward to bring the pressing shaft portion (33) into contact with the material to be processed (10) to clamp the material to be processed (10). Then, while the first and second molds (3a) and (3b) are synchronously rotated in the same direction in this sandwiched state, the forming roller (4) is pushed into substantially the center of the outer peripheral surface of the material to be processed (10). Then, the outer peripheral surface is cleaved to a certain depth to form a pair of flange corresponding parts (F ₀ ) (F ₀ ) (state of FIG. 6). At this time, the lower flange equivalent part (F ₀ )
Is maintained in its horizontal posture by the end face forming concave portion (31) of the first mold (3a), but the upper flange equivalent portion (F ₀ ) has nothing to restrict this, so the forming roller By pushing in (4), as shown in the figure, it will be tilted upward.

After the completion of the cleaving process, when the second mold (3b) is driven further downward while continuing the mold rotation, the pressing shaft portion (33) moves to the center of the work material (10). The material below the pressing shaft portion (33) is pushed out to the outer peripheral side, and the central portion of the material to be processed (10) is flattened. At this time, the material to be processed (10) is the end surface forming concave portion (3) of the first die (3a).
1) and the lower part of the outer periphery is constrained by the forming roller (4), so that the material to be extruded is located between the forming roller (4) and the pressure shaft portion (33) and upward. It is extruded into a tubular shape and grows (state of Fig. 7), and finally the tubular equivalent part (1
It is molded into 01) (state of Figure 8). Then, in the cylindrical portion equivalent forming step, the flange equivalent portion (F ₀ ) on the side of the second mold (3b) on one side moves upward in the inclined posture as shown in FIG. Finally, the end face forming concave portion (31) of the second mold (3b) is pressed, and the posture is almost corrected from the inclined posture to the horizontal posture as shown in FIG. Also, the flange corresponding portion (F ₀ ) on the other first mold (3a) side
Is pressed into the end face forming recess (31) of the first mold (3a) to form the final finished shape flange (F) because the internal pressure increases due to the above pressing (state of FIG. 8). . At the time of this molding, a slight gap is apt to occur between the cylindrical portion corresponding portion (101) and the pressure shaft portion (33).

After that, the pushing of the pressure shaft portion (33) is stopped, and the molding roller is kept in the mold rotating state.
By (4), the part corresponding to the cylinder part (101) is ironed. That is, the forming roller (4) located at the lower end of the cylindrical portion (101)
The operation of moving the cylinder portion corresponding to the cylindrical portion (101) upward in the substantially axial direction with the pressure applied is repeated a predetermined number of times. This allows
This cylindrical part (101) is expanded and the cylindrical part
The gap between the (101) and the pressure shaft (33) disappears, and the cylinder equivalent part (101) is molded into the cylinder part (1) of the final finish shape that follows the pressure shaft (33). To be done. Also, at the time of this molding, the material moved upward is the flange corresponding part (F) on the second mold (3b) side.
₍₂ ) is supplied to the end face forming concave portion (31) of the second mold (3b) by the forming roller (4) and the flange corresponding portion (F ₀ ) is pressed. ₀ ) is molded into the flange (F) of the final finish shape (state of FIG. 9). At this point in time, the thin wall portion (14) is formed between the end surface forming recess (31) of the first die (3a) and the pressing shaft portion (33). The wall is removed. In some cases,
The finished product is still provided with the thin wall portion (14). [Example 2] This Example 2 was carried out to manufacture a hub body (H) for a bicycle as shown in Fig. 10. The molding apparatus used for this is basically the above-mentioned embodiment. The configuration is the same as in Example 1. In the hub body (H), as shown in the same figure, a certain range from both end edges of the tubular portion (1) becomes the mounting end portions (11) and (11) for press-fitting the ball push. The spoke attachment flanges (F) and (F) extend from the inner ends of the attachment ends (11) and (11).

In the second embodiment, as shown in FIG. 11, the end face forming recesses (31) formed in the first and second molds (3a) and (3b) are the end faces in the first embodiment. Molded recess (31)
Flange-compatible recess (31a) similar to the above, and the above-mentioned mounting end (11)
And a cylindrical end-corresponding recess (31b) having a shape corresponding to. The other parts are configured in the same manner as in the first embodiment.

In order to mold the hub body (H) using this molding apparatus, first, as shown in FIG. 11, a first mold (3a) is formed.
The material to be processed (10) accommodated in the end face forming concave portion (31) is clamped by pressing the pressing shaft portion (33) from above. In this Example 2, the material to be processed (10)
Is made of a thick disk-shaped aluminum alloy, and has a structure in which both end faces are shaped by forging to match the outer face shape of (F) and the finished mounting end (11) is projected from each end face. There is. Then, in the housed state, one end of the material to be processed (10) is fitted into the flange corresponding recess (31a) and the cylinder end corresponding recess (31b).

Then, the first and second molds (3a) (3b) are rotated.
While rolling the forming roller (4), the outer peripheral surface of the work material (10)
Push it inward from the middle to a certain depth from the outer peripheral surface
Cleave and remove the pair of flange equivalents (F₀) (F₀) Molding
I do. In addition, in this embodiment, at substantially the same time as the initiation of dehiscence,
The second die (3b) is driven to descend and the pressure shaft (33) is processed material.
Start pushing in (10). This allows the dehiscence
In the process, the upper flange equivalent part (F₀) To the base end
By pushing in the pressure shaft (33), it is pushed out to the outer peripheral side.
Material will be supplied, the second mold (3b) side
Flange equivalent (F₀) Does not tilt upwards, and the final finish shape
The shape is similar to the flange (F) of
Line condition). At this time, the flange on the first die (3a) side
Equivalent part (F ₀) Corresponded to the above flange corresponding recess (31a)
Since it is in a state, the fla
Equivalent part (F₀) Is the final finished flange
(F).

After that, when the pushing operation of the pressing shaft portion (33) is continued, the extruded material extruded to the outer peripheral side by the pressing shaft portion (33) is pressed as in the first embodiment. Shaft (3
It grows upward in a manner substantially conforming to 3) and is formed into a cylinder-corresponding portion (101). At the same time, the end surface forming recess of the second mold (3b)
The upper flange equivalent portion (F ₀ ) and the mounting end portion (11) are fitted into the (31). At this time, since the flange-corresponding portion (F ₀ ) has a shape similar to that of the flange (F) having the final finish shape as described above, this fitting causes the end face forming concave portion (31) to be formed.
When the pressure is applied to, the flange (F) is finished (state of solid line in FIG. 12). Further, even if the mounting end portion (11) on the side of the second mold (3b) is slightly deformed in the growth step, the mounting end portion (11) into the recess (31b) corresponding to the cylinder end portion of the second mold (3b) is formed. The fitting corrects the deformation.

Further, when the ironing process similar to that of the first embodiment is performed by the forming roller (4), the cylinder-corresponding portion (101) is expanded and the flanges (F) and (F) in the cylinder portion (1) are expanded. The space is finished (state of FIG. 13). A thin wall portion (14) similar to that of the above-described first embodiment is formed and is removed by post-processing. In this case, since the upper flange-corresponding portion (F ₀ ) formed by cleavage has a shape similar to that of the flange (F), the flange finishing process by the forming roller (4) as in the above-mentioned Example 1 is performed. Almost unnecessary.

The shape of both end faces of the initial work material (10)
However, as mentioned above, the end face shape of the hub body (H) in the completed state
Since it corresponds to
It is not necessary to form the parts (11) and (11). [Modification] In each of the above-mentioned examples, the forming roller (4) was not applied.
Flang of the same thickness by pushing it into the center of the outer peripheral surface of the work material (10)
Equivalent part (F₀) (F₀), But this
Flanges with different wall thicknesses can be pushed to one side
Equivalent part (F₀) (F ₀) May be molded. Also,
Although the lunges (F) and (F) have the same diameter, they have different diameters.
It can also be molded into objects. In addition, the tube (1) is tapered
However, it can be molded by the present invention.

[0024]. In each of the above-mentioned embodiments, the material to be processed (10) is made of an aluminum alloy, but the material is not limited to this, and other materials can be adopted as long as they are plastically deformable materials. . In the above embodiment, the winding drum (D) and the hub body (H)
Although it is carried out in the manufacture of,
As long as the flanges (F) and (F) have a protruding shape on both ends of (1), it can be used for manufacturing the same.

[Brief description of drawings]

FIG. 1 is an explanatory view of a work material (10) before processing in a conventional example.

[FIG. 2] An explanatory view of a step of plastically processing the material (10) to be processed.

[Fig. 3] The final step of this plastic working and the hub body in a completed state
Illustration of (H)

FIG. 4 is an explanatory diagram of a winding drum (D) manufactured in Example 1 of the present invention.

FIG. 5 is an explanatory view of a state in which the material to be processed (10) is set in the molding apparatus of Example 1.

FIG. 6 is an explanatory view when the dehiscence process is completed.

FIG. 7 is an explanatory diagram of a state in the middle of the growth process.

FIG. 8 is an explanatory diagram of the completion of the growth process.

FIG. 9 is an explanatory diagram when the ironing process is completed.

FIG. 10 is an explanatory diagram of a hub body (H) manufactured in Example 2.

FIG. 11 is an explanatory diagram of a state in which the material to be processed (10) is set.

FIG. 12 is an explanatory diagram showing from dehiscence to completion of growth process.

FIG. 13 is an explanatory diagram when the ironing process is completed.

[Explanation of symbols]

(1) ・ ・ ・ Cylinder part (F) ・ ・ ・ Flange (3a) ・ ・ ・ First mold (3b) ・ ・ ・ Second mold (31) ・ ・ ・ End face forming recess (33) ・ ・ ・Pressure shaft (4) ・ ・ ・ Forming roller (F ₀ ) ・ ・ ・ Flange equivalent (101) ・ ・ ・ Cylinder equivalent

Claims (6)

[Claims] 1. A block-shaped workpiece material for a cylinder with a flange in which flanges (F) (F) are projected on both ends of the cylinder (1).
In the method for manufacturing a flanged tubular body of the type from (10) by plastic working, a pair of first and second gold having an end face forming recess (31) for forming an end face shape including a flange (F). The molds (3a) and (3b) are opposed to each other, the pressing shaft portion (33) is projected from the center of the end face forming recess (31) of the one second mold (3b), and the other first mold ( 3a)
A disk-shaped forming roller (4) is placed on the outer periphery of the. The material to be processed (10) housed in the end face forming recess (31) of the first mold (3a) is clamped by the pressure shaft (33) of the second mold (3b) to rotate these molds. While pushing the forming roller (4) into the material to be processed (10) and cleaving the outer peripheral surface of the forming roller (4) up to a certain depth into a pair of flange corresponding parts (F ₀ ) (F ₀ ). Simultaneously with or after completion of this cleaving step, the pressing shaft portion (33) is pushed into the workpiece material (10) in the mold rotating state and pushed out to the outer peripheral side, and the extruding material is pushed into the pressing shaft portion (33). ) And the molding roller (4) to grow to the side of the second mold (3b) to mold into a cylinder-corresponding part (101), and. A step of performing ironing with the forming roller (4) on the cylinder equivalent part (101) to finish the cylinder part (1) following the pressing shaft part (33); A step of pressing the corresponding flange portion (F ₀ ) (F ₀ ) to the corresponding end face forming recesses (31) (31) to finish the flange (F) (F), Manufacturing method. 2. The method for manufacturing a flanged cylinder according to claim 1, wherein the flange-corresponding portion (F ₀ ) on the first die (3a) side is finished into a flange (F) during the cleaving step. 3. The flanged cylinder according to claim 1, wherein the flange equivalent part (F ₀ ) (F ₀ ) is finished into a flange (F) (F) after the step of forming the cylinder equivalent part (101). Body manufacturing method. 4. A structure in which the diameter of the pressing shaft portion (33) is substantially matched with the inner diameter of the cylindrical portion (1) in a completed state, and the length thereof is substantially matched with the depth of the cylindrical portion (1). The method for manufacturing a flanged cylinder according to any one of claims 1 to 3. 5. The structure according to claim 1, wherein the pressing shaft portion (33) is pushed into the material to be processed (10) substantially at the same time when the material to be processed (10) is torn by the forming roller (4). 5. The method for manufacturing a flanged cylinder according to claim 4. 6. The flanged cylinder according to claim 1, wherein the shape of both end surfaces of the block-shaped material to be processed (10) is matched with the end surface shape of the flanged cylinder in a completed state. Body manufacturing method.