JP2001079618A - Spinning and cleaving device and manufacture of wheel using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the biting of y cleaving blade to a blank and to cleave the blank efficiently by setting the angle which is formed with both side faces of the cleaving blade continuously or stepwise smaller as advancing to the edge side of the blade. SOLUTION: Both side faces 21 in the edge part 20a of the blade of the cleaving blade 20 and both side faces 22 in the root part 20b of the blade are respectively composed of linear slopes in the cross sections of partial conical surface shapes. The angle α1 formed with both side faces 21 at the edge part 20a of the blade and angle α2 formed with both side faces 22 at the root part 20b of the blade are composed so as to be α1<α2. When this cleaving blade 20 is used, the biting of the cleaving blade 20 to the blank is maintained in good conditions and cleaved pieces 6A, 7A are outward expanded with both side faces 22 in the root part 20b of the blade, so the angle which is formed with a pair of the cleaved pieces 6A, 7A to be formed can be set larger. Then, spinning for forming a rim part is smoothly executed. Thus, the number of wheel manufacturing processes is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning tearing device suitable for manufacturing a wheel.

[0002]

2. Description of the Related Art As a method of manufacturing a vehicle wheel, Japanese Patent Publication No. 3-71209 discloses a metal disk-shaped material plate excellent in extensibility, and a central portion of the material plate between mandrel. While rotating with the mandrel while pinching, the outer peripheral portion of the raw material plate is split radially bifurcated in the middle of the thickness direction by a splitting blade to form a pair of split pieces,
Further, there has been proposed a configuration in which the pair of split pieces is subjected to spinning by a roller to form a rim portion. Normally, as the splitting blade, a splitting blade having a constant angle θ between both side surfaces 101 and 102, such as a splitting blade 100 shown in FIG. 11, is employed. In addition, like the splitting blade 110 shown in FIG.
One side surface 11 with respect to the reference plane A orthogonal to the rotation center of
1 and the angle θ2 formed by the other side surface 112.
Has been proposed (see Japanese Patent Application Laid-Open No. 1-87020), but also in this splitting blade 100, the angle θ1 + θ2 formed by both side surfaces 111 and 112 is set to be constant. ing.

As another method of manufacturing a wheel, a disc-shaped raw material plate is formed into a bottomed basin by spinning, and a bottom surface of the molded product is punched to form a rim portion.
A manufacturing method in which a separately formed disk portion is connected to the rim portion to obtain a wheel has been widely adopted.

[0004]

When a wheel is manufactured by splitting a disk-shaped material plate as described above, it is formed by splitting due to spinning after splitting.
It is necessary to set the angle formed by a pair of splitting pieces to a certain degree, but if the angle formed by both sides of the splitting blade is set large to set the angle formed by the splitting pieces large, The bite of the blade becomes worse and a large pressing force is required, and there is a concern that the material plate may be deformed at the time of tearing. For this reason, in the said manufacturing method, after performing tearing using an acute-angled tearing blade, using a roller-shaped tearing blade, the work of pushing out the tearing piece again is performed. The number of working steps for the splitting increases, the processing cost increases, and it is necessary to prepare a plurality of spinning splitting devices.

It is an object of the present invention to provide a spinning tearing device capable of efficiently tearing a material plate with one tearing blade and a method of manufacturing a wheel using the same.

[0006]

According to the first aspect of the present invention, there is provided a spinning tearing device in which a tearing blade is pressed against an intermediate portion in a thickness direction of an outer peripheral edge while rotating a disk-shaped material plate. A spinning tearing device for splitting the outer peripheral portion of the material plate in a forked manner, wherein the angle formed by both side surfaces of the splitting blade toward the cutting edge is continuous or stepwise, or a combination of both. Are set smaller. In this way, the angle formed by both side surfaces of the splitting blade becomes smaller toward the cutting edge, that is, the cutting edge is made sharper, so that the splitting blade bites into the material plate. Thus, the material plate can be efficiently cleaved. On the other hand, since the angle formed between the two side surfaces of the splitting blade becomes larger toward the cutting edge side, the split pieces formed by the cutting are pushed outward, and the pair of split pieces formed is cut off. It is possible to set a large angle. In addition, a pair of split pieces are pressed toward the split side by both sides on the blade side of the splitting blade, so that the tip of the splitting blade is effectively cut into the splitting tip of the material plate. And the material plate can be split efficiently.

According to a second aspect of the present invention, as the tearing blade, the angle α1 formed by both sides at the cutting edge is set to 40 ° or less, and the angle α2 formed by both sides at the cutting edge is α2>.
The one set to α1 is used. By setting the angle α1 between both side surfaces of the cutting edge to 40 ° or less as described above, it is possible to sufficiently secure the biting ability of the splitting blade with respect to the material plate, and to improve the splitting performance.

According to a third aspect of the present invention, the angle α2 formed between the side surfaces at the cutting edge is set to 60 ° to 70 °. Thus, the angle α between the two sides at the blade edge
By setting 2 to 60 ° to 70 °, it is possible to set a sufficiently large angle formed by a pair of split pieces that can be formed by one splitting blade.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a wheel, comprising using the spinning tearing device according to any one of the first to third aspects to rotate a disk-shaped material plate in a thickness direction of an outer peripheral edge. Is cut in a bifurcated manner with a splitting blade to form a pair of split pieces, and the split pieces are processed into a rim shape by spinning. In this manufacturing method, since the above-described splitting device is used, it is possible to split the material plate by a required amount by a single splitting process, thereby reducing the number of manufacturing steps of the wheel and reducing the processing cost. In addition to the reduction, there is no need to provide a plurality of tearing devices in the wheel manufacturing line, which is economically advantageous in equipment.

According to a fifth aspect of the present invention, the rotation speed of the blank at the initial stage of the tearing is set lower than the rotation speed of the blank thereafter. In the initial stage of the dehiscence, the positional relationship between the material plate and the dehiscence blade tends to fluctuate due to the surface properties of the part to be dehisced, etc. By keeping the rotation speed of the material plate low in the early stage of tearing until stable,
The material plate can be split with high accuracy. In addition, after the initial stage of cleavage, to increase the processing speed and increase productivity,
The rotation speed of the blank is set to be high.

According to a sixth aspect of the present invention, as the material plate, a blank material generated by punching when manufacturing another wheel is used. Depending on the manufacturing method, a disc-shaped hollow material may be generated during the manufacturing process of the wheel. Conventionally, such a hollow material is treated as a waste material. However, in the present invention, a wheel can be manufactured by effectively utilizing such a hollow material, so that the manufacturing cost of the wheel can be significantly reduced. In addition, less energy loss for reuse than when reusing the hollow material by melting etc.
It becomes a product that is friendly to the global environment.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an embodiment in which the present invention is applied to a spinning tearing device used when manufacturing a vehicle wheel. Hereinafter, the spinning device will be described while describing a method of manufacturing the wheel. First, as shown in FIG. 1, a metal plate is punched to produce a disk-shaped material plate 1. As the metal material constituting the raw material plate 1, any metal material can be used as long as it has high malleability, but it is preferable to use a lightweight aluminum alloy in order to improve the running performance of the vehicle. When a relatively small wheel such as a motorcycle is manufactured using the material plate 1, for example, a disc-shaped hollow material generated when manufacturing a vehicle wheel may be used as the material plate. It is possible, and with such a configuration, the wheel can be manufactured by effectively utilizing the discarded blank material, so that the manufacturing cost of the wheel can be significantly reduced. Further, compared to the case where the hollow material is melted and reused, energy loss for reuse is smaller, and the product is environmentally friendly.

Next, as shown in FIG. 2, a portion of the raw material plate 1 corresponding to the disk portion 2 (see FIG. 10) is press-formed into a predetermined cross-sectional shape, and the reduction hole 3 and the shaft hole 4 are formed.
And a bolt mounting hole 5 formed by punching
Make A. The number and shape of the relief holes 3 can be set arbitrarily. In addition, the number of the bolt mounting holes 5 is appropriately set to a number according to the vehicle to which the bolt is applied. However, this press forming process may be performed simultaneously with the production of the blank 1 from the metal plate.

Next, as shown in FIG. 3, a material plate 1A in which a reduction hole 3, a shaft hole 4 and a bolt mounting hole 5 are formed is sandwiched between a pair of mandrels 10 and 11 so as to be relatively non-rotatable. While rotating the plate 1A together with the mandrels 10 and 11,
The distal end of the tearing blade 20 is pressed against an intermediate portion of the outer peripheral portion of the raw material plate 1A in the thickness direction, and as shown in FIGS.
A is cut in a bifurcated fashion at the outer periphery of the rim A, and the rims 6 and 7 (FIG. 1)
0) having a pair of split pieces 6A, 7A. In the present embodiment, the substantially central portion of the material plate 1A is torn, but a position biased to one side in the thickness direction of the material plate 1A is torn so that the thicknesses of the split pieces 6A and 7A are different. You may. Further, it is also possible to bend the middle part of the material plate 1A in the radial direction and to split from the bent part. Further, after the outer peripheral portion of the raw material plate 1 is split by the splitting blade 20, press forming may be performed on the central portion to manufacture the raw material plate 1B. In this case, the flatness of the material plate 1 to be cleaved is easily obtained, and the cleaving accuracy can be improved.

The splitting blade 20 is a substantially disk-shaped member having a sharp outer peripheral portion. As shown in FIG. 4, both side surfaces 21 of the blade edge portion 20a and both side surfaces 22 of the blade root portion 20b are partially formed, respectively. The conical surface is formed by a linearly inclined surface having a cross section, and the cutting edge portion 20 is formed.
The angle α1 formed by both side surfaces 21 of a and the angle α2 formed by both side surfaces 22 of the blade base 20b are configured to satisfy α1 <α2. The angle α1 is preferably set to 40 ° or less in order to ensure the biting property with respect to the material plate 1A, and if the angle α1 is less than 15 °, the cutting edge is easily broken, so that the angle α1 is within 20 ° ± 5 °. It is preferable to set. The angle α2 can be arbitrarily set as long as it is larger than the angle α1, but if it is smaller than 60 °, the outer peripheral ends of the split pieces 6A and 7A interfere with the rotating shaft 23 of the split blade 20. When the angle is larger than 70 °, the outer peripheral ends of the splitting pieces 6A and 7A abut against both side surfaces 22 of the splitting blade 20 at an angle α2. Since it is not possible to smoothly guide both sides, it is preferable to set the angle between 60 ° and 70 °.

The radius R of the cutting edge is set according to the tearing conditions such as the material and thickness of the blank 1A, the feed amount of the tearing blade 20 and the rotation speed of the mandrels 10 and 11. For example, when a material plate made of an aluminum alloy having a thickness of 6 to 8 mm is to be cleaved, a tearing blade having a radius R of 0.8 to 1.5 mm is used. Also, the width T1 of the cutting edge portion 20a
Is set larger as the tearing width T (see FIG. 3) of the outer peripheral portion of the material plate 1A increases. However, when the width T1 of the cutting edge portion 20a is less than 20 mm, the split piece 6
Since the legs A and 7A are difficult to split, the resistance changes when the outer peripheral ends of the split pieces 6A and 7A come into contact with the side surfaces 22 are increased, causing distortion and runout, etc. Since the legs 6A and 7A are forcibly opened and the tip of the split is torn, the minimum length is set to 20 mm or more.

The rotational speeds of the mandrels 10 and 11 are set at two stages from the initial stage of dehiscence and thereafter, the rotational speed at the initial stage of dehiscence is set at 150 rpm ± 10%, and after the initial stage of dehiscence is set at 250 to 400 rpm. Have been. In addition, the feed amount of the splitting blade 20 is also set in two stages of the initial stage of splitting and thereafter, the feed amount of the initial splitting stage is set to 10 ± 5 mm per minute,
After the initial stage of dehiscence, it is set at 30 to 35 mm per minute.
That is, in the initial stage of the splitting, the material plate 1A and the splitting blade 20
The material plate 1A is cut into, for example, about 10 to 15 mm, and the material plate 1A and the splitting blade 2 are cut.
It is possible to accurately tear the material plate 1A by suppressing the rotation speed of the material plate 1A and reducing the feed amount of the cleavage blade 20 in the initial stage of the tearing until the positional relationship with 0 becomes stable. Becomes After the initial stage of the splitting, the rotational speed of the blank 1A is set to be high and the feed amount of the splitting blade 20 is set to be large in order to increase the processing speed to increase the productivity. The center misalignment of the splitting blade 20 with respect to the thickness direction of the material plate 1A needs to be set within ± 0.5 mm when using a material plate having a plate thickness of 6 to 8 mm, for example. Such a misalignment becomes large due to a decrease in flatness of the outer peripheral portion of the material plate 1A before the cleavage, and thus the material plate 1A
It is preferable to provide a step of adjusting the flatness of the outer peripheral portion of the material plate 1A after the press forming of A. Further, means for externally supporting the outer peripheral portion of the material plate 1A is provided on the side of the cleaving device, and the vibration of the material plate 1A when the material plate 1A is cleaved is regulated, so that a cleaving blade for the material plate 1A is provided. 20 misalignment may be prevented.

When the tearing blade 20 as described above is used, the bite of the tearing blade 20 with respect to the material plate 1A is favorably maintained,
Moreover, since the split pieces 6A, 7A are pushed outward by the both side surfaces 22 of the cutting edge portion 20b, the angle formed by the pair of split pieces 6A, 7A to be formed can be set large, and the split can be performed. The spinning process described later for forming the rim portions 6 and 7 can be smoothly performed without providing a step for splitting the split pieces 6A and 7A later, and the distal end portion of the split blade 20 is attached to the material plate 1A. Can smoothly penetrate into the cleaving tip of the material plate, and the material plate 1A can be cleaved efficiently.

As the splitting blade 20, any shape can be adopted as long as the angle between both side surfaces is set to be smaller continuously or stepwise, or a combination of both, as it goes toward the cutting edge. It is possible. For example, like the splitting blade 20A shown in FIG. 6, both side surfaces are formed by an inclined surface 25 whose angle is changed in three steps or four or more steps, or like the splitting blade 20B shown in FIG. , Both sides can be configured with a curved surface 26 whose angle is continuously changed,
Like the splitting blade 20C shown in FIG. 7 (b), the cutting edge side is constituted by an inclined surface 27 having a constant angle, and the cutting edge side is constituted by a curved surface 28 whose angle is continuously changed. And the curved surface 28 may be configured to be smoothly connected.

Next, as shown in FIG. 8, a cleavage piece 6A corresponding to the outer rim portion 6 of the material plate 1B is cut into a predetermined length corresponding to the outer rim portion 6, and the material plate 1C is cut. To manufacture. Next, the material plate 1C is subjected to an annealing treatment to restore the work hardening of the cleaved portion to the original hardness and to make the metal structure of the material plate 1 uniform. In other words, the hardness of the opposing surfaces of the split pieces 6A and 7A is increased by work hardening and the metal structure is disturbed by the splitting. Therefore, the hardness of the opposing surfaces and the original state are restored by annealing. The tissue may be homogenized to enhance the extensibility of the split pieces 6A and 7A, so that the opposing surfaces of the split pieces 6A and 7A, particularly the split tip, do not break during spreading in the next step. preferable. However, this annealing process is performed on the material plate 1
B may be applied. Next, as shown in FIG. 9, the raw material plate 1C is sandwiched between the pair of mandrels 12 and 13 so as not to rotate relatively, and the raw material plate 1C is rotated with the mandrels 12 and 13 while being rolled onto the split pieces 6A and 7A. Are pressed against each other, and the roll 14 is moved in the left-right direction so that the split pieces 6A,
The rim portions 6 and 7 are formed by extending 7A along the outer peripheral surfaces of the mandrels 10 and 11. Next, curling portions 6a and 7a are formed by performing a curling process on the tip portions of the rim portions 6 and 7, and a wheel 8 having a shape as shown in FIG. 10 is obtained.

In this embodiment, the method of manufacturing the wheel 8 in which the outer rim portion 6 is shorter than the inner rim portion 7 and the spinning tearing device used for the same have been described. Any structure can be applied as long as it is formed by cleavage. For example, the present invention can be similarly applied to a case where a wheel having both rim portions 6 and 7 having the same length is manufactured. Further, the present invention can be similarly applied to manufacturing various parts other than wheels, for example, pulleys in a power transmission device.

[0022]

According to the spinning tearing device of the first aspect, the angle formed by both side surfaces of the tearing blade becomes smaller toward the blade edge, that is, the angle becomes sharper toward the blade edge. This makes it possible to improve the bite of the cleaving blade into the material plate, and to efficiently tear the material plate. On the other hand, since the angle formed between the two side surfaces of the splitting blade becomes larger toward the cutting edge side, the split pieces formed by the cutting are pushed outward, and the pair of split pieces formed is cut off. It is possible to set a large angle. In addition, a pair of split pieces are pressed toward the split side by both sides on the blade side of the splitting blade, so that the tip of the splitting blade is effectively cut into the splitting tip of the material plate. And the material plate can be split efficiently.

According to a second aspect of the present invention, as the splitting blade, an angle α1 formed by both side surfaces at the cutting edge is set to 40 ° or less, and an angle α2 formed by both side surfaces at the cutting edge is set to α2> α1. When it is used, it is possible to sufficiently secure the biting ability of the splitting blade into the material plate.

When the angle α2 formed between the side surfaces at the cutting edge is set to 60 ° to 70 °, the angle formed by a pair of split pieces that can be formed by one splitting blade is sufficient. Can be set large.

According to the fourth aspect of the present invention, since the spinning splitting device according to any one of the first to third aspects is used, the necessary amount of the raw material plate can be reduced by a single splitting process. Only the number of steps in the wheel manufacturing process and the processing cost can be reduced, and there is no need to install multiple tearing devices in the wheel manufacturing line, which is economically advantageous for equipment. Become.

According to a fifth aspect of the present invention, when the rotation speed of the blank at the initial stage of the cleavage is set lower than the rotation speed of the blank thereafter, the accuracy of the cleavage of the blank is improved.
It is possible to improve productivity at the same time.

According to a sixth aspect of the present invention, when a blank formed by punching during the manufacture of another wheel is used as a material plate, the wheel can be manufactured by effectively utilizing the disc-shaped blank as it is. The amount of energy used for reuse can be reduced as compared with the case where the hollow material is reused by melting or the like as in the related art.

[Brief description of the drawings]

FIG. 1 is a perspective view of a material plate.

FIG. 2 is an explanatory view of a material plate in which a reduction hole, a shaft hole, and a bolt mounting hole are formed.

FIG. 3 is an explanatory view of a tearing operation.

Fig. 4 Longitudinal section near the splitting blade during splitting

FIG. 5 is a longitudinal sectional view of a ruptured material plate.

FIG. 6 is a front view of a splitting blade having another configuration.

FIG. 7 is a front view of a splitting blade having another configuration.

FIG. 8 is a longitudinal sectional view of a material plate in which a part of a dehiscence piece is cut.

FIG. 9 is an explanatory view of a spinning process.

FIG. 10 is a longitudinal sectional view of a wheel.

FIG. 11 is a front view of a splitting blade according to a conventional technique.

FIG. 12 is a front view of another splitting blade according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Material plate 1A Material plate 1B Material plate 1C Material plate 2 Disk part 3 Reduction hole 4 Shaft hole 5 Bolt mounting hole 6 Outer rim part 7 Inner rim part 6a Curled part 7a Curled part 6A Splitting piece 7A Splitting piece 8 Wheel 10 Mandrel 11 Mandrel 12 Mandrel 13 Mandrel 14 Roll 20 Splitting blade 20a Blade tip 20b Blade base 21 Side surface 22 Side surface 23 Rotation axis 20A Splitting blade 25 Inclined surface 20B Splitting blade 26 Curved surface 20C Splitting blade 27 Inclined surface 28 Curved surface

Claims (6)

[Claims] 1. A spinning cleaver in which a tearing blade is pressed against a middle part of the outer peripheral edge in the thickness direction while rotating a disk-shaped raw material plate, and the outer peripheral portion of the raw material plate is bifurcated. A spinning tearing device, wherein an angle between both side surfaces of the splitting blade is set to be smaller continuously or stepwise, or a combination of both, as going toward a cutting edge. 2. The splitting blade according to claim 1, wherein an angle α1 formed by both side surfaces of the cutting edge is set to 40 ° or less, and an angle α2 formed by both side surfaces of the cutting edge is set to α2> α1. A spinning tear device as described. 3. An angle α2 formed between both side surfaces at the cutting edge is 6
3. The spinning tearing device according to claim 1, wherein the spinning device is set at 0 to 70 degrees. 4. The spinning tearing device according to any one of claims 1 to 3, wherein the outer peripheral edge is bifurcated with a tearing blade while rotating the disk-shaped material plate. A pair of split pieces formed by cutting the split pieces into a rim shape by spinning. 5. The method of manufacturing a wheel according to claim 4, wherein the rotation speed of the blank at the initial stage of the tearing is set lower than the rotation speed of the blank thereafter. 6. The method for manufacturing a wheel according to claim 4, wherein a blank material generated by punching when manufacturing another wheel is used as the material plate.