JP3614244B2 - Method for forming tapered peripheral surface of metal cup body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a tapered peripheral surface of a metal cup body for forming a tapered peripheral surface on the outer periphery of the opening end of the cup body formed of a metal plate.
[0002]
[Prior art]
As a mechanical component in a certain type of equipment, for example, a cup body made of a metal having a diameter of 5 mm to 50 mm and a wall thickness of about 1 mm to 5 mm is used. The cup-shaped mechanism component is required to have high strength depending on the application, and may be required to have high accuracy on the tapered peripheral surface formed on the outer periphery of the opening end.
[0003]
As a conventional method for forming a cup body made of a metal material having a tapered peripheral surface on the outer periphery of the opening end, cutting with a lathe is generally used. That is, the first example is a series of lace processing methods using a lathe in which a material made of a metal rod is processed into a cup shape, a tapered peripheral surface is formed on the peripheral surface of the open end, and further cut into a predetermined dimension. There is.
[0004]
In addition, the second example is that the metal plate is deep-drawn by pressing and the opening end side is cut into a predetermined dimension by a lathe, and then the opening end outer peripheral surface of the cup material 1 is cut as shown in FIG. There is also a method of forming the tapered peripheral surface 3 by cutting at an angle indicated by a two-dot chain line 2 with a lathe. Further, in the third example, similarly, after deep-drawing a metal plate, the opening end side is cut into a ring shape by pressing, and then the opening end outer peripheral surface is turned by an angle indicated by a two-dot chain line in FIG. There is also a method of forming the tapered peripheral surface 3.
[0005]
[Problems to be solved by the invention]
However, as in the first example, the method of lacing from a metal bar by a lathe includes a factor that increases the cost because it requires a lot of time, and as shown in FIG. Since the rolling direction 12 is the axial direction, there is a problem that the strength of the bottom 1a becomes insufficient. In the case of the second and third examples, since deep drawing processing by a press and lace processing by a lathe are performed, the processing machines are different depending on each process, so that consistent processing cannot be performed and productivity is hindered. After all, it becomes cost increase. In addition, there is a problem that variations in the accuracy of the cup-shaped mechanism component and the surface roughness of the tapered peripheral surface 3 of the outer peripheral surface of the opening end occur only by lace processing.
[0006]
In view of the above problems, the present invention is intended to provide a method for forming a taper peripheral surface of a metal cup body that can improve productivity and can form a taper peripheral surface with high accuracy.
[0007]
[Means for Solving the Problems]
The method for forming a tapered peripheral surface of a metal cup body according to claim 1 is for punching a metal plate material, bending the metal material to form a substantially dish-shaped element body, and forming the cylindrical portion by drawing the element body. Then, after forming into a substantially cup shape, a punch having a tapered surface on the inner peripheral surface is pressed from the opening end side of the cylindrical portion to form a tapered peripheral surface on the outer periphery of the opening end.
[0008]
According to the method for forming the tapered peripheral surface of the metal cup body according to claim 1, since the stamping process and the drawing process for the metal plate can be performed consistently by pressing, a series of progressive processes using a metal hoop material can be performed. Thus, productivity can be greatly increased and costs can be reduced. Moreover, since the consistent processing by a press can be performed, it can process with high precision with respect to the metal cup body itself and the taper surrounding surface of the opening end outer periphery.
[0009]
The method for forming a tapered peripheral surface of a metal cup body according to claim 2 is characterized in that the rolling direction is formed in a substantially U-shaped cross section in which the cylindrical portion and the bottom portion are continuous.
[0010]
According to the second aspect, since the rolling direction of the metal plate is bent, the rolling direction of the cylindrical portion and the bottom portion communicates with each other, so that the strength of the metal cup body can be increased.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a metal cup body 30 manufactured by the method for forming a tapered peripheral surface of a metal cup body according to the present invention. The metal cup body 30 is made of a metal such as iron, stainless steel, or brass, and has, for example, a cup shape with a diameter of about 10 mm, a height of 8 mm, and an inner diameter of 5 mm. In addition, each dimension of the metal cup body 30 can be arbitrarily set to a size of about several mm to several cm in addition to the above dimensions. Further, a tapered peripheral surface 31 having an angle of 5 degrees to 80 degrees with respect to the axial center is formed on the outer peripheral surface of the opening end of the metal cup body 30. The metal cup body 30 is manufactured by a forming method described below.
[0012]
FIG. 2 shows a punching process for punching a metal plate material. As the metal plate material 10, for example, an iron plate material having a thickness of 3 mm is used. An appropriate thickness of the metal plate material 10 is selected depending on the final dimensions of the metal cup body 30. The die 21 is used for this punching process. That is, the mold 21 is composed of a punching punch 22 and a die 23. The punching punch 22 has a protruding portion 22a that protrudes slightly in the shape of a truncated cone on the front end surface, and has an outer diameter dimension larger than an outer diameter dimension of the metal cup body 30 as a final product. On the other hand, the punching die 23 is provided with a circular hole 23 a that fits into the punching punch 22.
[0013]
Then, after the metal plate material 10 is placed on the die 23, when the punching punch 22 is lowered from the upper side in the drawing, the metal plate material 10 first enters the hole 23 a of the die 23 due to the pressing of the protrusion 22 a of the punching punch 22. It is pushed in and bent into a substantially dish shape. When the punching punch 22 is further lowered, the metal plate material 10 is punched into a predetermined outer diameter by the punching punch 22 and the edge of the hole 23a of the die 23. Thereafter, as shown in FIG. 2, the metal plate material 10 is pressed into the hole 23 a of the die 23 in a press-fitted state, and the element body 11 is formed.
[0014]
In the example described above, the metal plate material 10 is formed in a substantially dish shape in a single process and the outer shape is punched. However, the present invention is not limited to this example. In the case of processing, the processing stage may be separated, formed into a substantially dish-like shape with respect to the metal plate material 10 at the first stage, and the outer diameter may be punched out at the next second stage. As another example, after the metal plate material 10 is first punched to a predetermined outer diameter, the element body 11 shown in FIG. 2 may be curvedly formed by another punch (not shown). They can be applied in an appropriate order.
[0015]
Further, in the above embodiment, the element body 11 is bent and formed in a substantially trapezoidal shape so that the flange portion 11a is formed on the outer periphery. However, as shown in FIG. It may be curved so that Further, in the above embodiment, the angle θ of the flange portion 11a is set to about 45 degrees, but in the case of this angle θ, the final taper angle θ on the tapered peripheral surface 31 of the metal cup body 30 is also about 45 degrees. Thus, both angles are formed at substantially equal angles. Therefore, it can be changed within a range of about 5 degrees to 80 degrees in accordance with a desired taper angle of the tapered peripheral surface 31.
[0016]
The element body 11 formed in a substantially dish shape forms a cylindrical portion 11b in the element body 11 by a drawing process shown in FIG. In other words, the mold 24 used in the drawing process includes a drawing punch 25 and a die 26, and the outside diameter of the drawing punch 25 is formed in a cylindrical shape so as to be the inside diameter of the metal cup body 30 that is the final product. Has been. On the other hand, a circular hole 26 a is formed in the die 26, and the inner diameter dimension of the hole 26 a is smaller than the outer diameter dimension of the material 11.
[0017]
When the drawing punch 25 is lowered after placing the material 11 on the die 26, the base body 11 is press-fitted into the hole 26 a of the die 26 and is subjected to drawing processing. In this drawing process, since the element body 11 is curved in advance in a substantially dish shape, the pressing force may be lower than that of a general deep drawing process. By the drawing process, the outer peripheral portion of the element body 11 rises into a cylindrical shape, and the cylindrical portion 11b is integrally formed. Further, the open end of the cylindrical portion 11b is formed in a substantially triangular shape in cross section with a substantially tapered peripheral surface 11d formed on the outer periphery as shown in the figure.
[0018]
Thereafter, the element body 11 is formed with a tapered peripheral surface on the outer periphery of the opening end by a tapered peripheral surface forming step. That is, as shown in FIG. 4, the taper forming punch 27 used in this taper peripheral surface forming step is formed in a substantially cup shape having a circular tip, and a taper surface 27a is formed on the inner peripheral surface of the bottom. ing. When the taper-forming punch 27 is lowered toward the opening end of the element body 11, the opening end of the element body 11 is pressed by the taper surface 27a of the taper-forming punch 27, and the metal shown in FIG. A tapered peripheral surface 31 of the cup body 30 is formed. At this time, the open end of the element body 11 having a substantially triangular cross section is moved by the tapered surface 27a of the taper forming punch 27, and the metal cup body 30 as the final product shown in FIG. 4 is completed. In the above taper peripheral surface forming step, since the substantially tapered peripheral surface 11d is formed in advance on the outer periphery of the opening end of the element body 11, the tapered peripheral surface 31 can be formed with a small pressing force.
[0019]
In order to finally obtain a desired axial dimension, inner / outer diameter dimension, or tapered peripheral surface 31 in the metal cup body 30, the thickness of the metal plate material 10 as a material and the punching step of forming a substantially dish shape It is necessary to set the diameter and the amount of drawing in the drawing process in advance. In other words, it is important to appropriately set dimensions that take into account the amount of plastic deformation by calculation or the like during design.
[0020]
Incidentally, when the axial dimension of the metal cup body 30 is increased, the outer diameter dimension of the drawing punch 25 is set to be relatively small with respect to the inner diameter dimension of the hole 26a of the die 26. Further, when the axial dimension is reduced, the outer diameter dimension of the drawing punch 25 is set to be relatively larger than the inner diameter dimension of the hole 26 a of the die 26. As described above, by appropriately setting the relationship between the outer diameter dimension of the drawing punch 25 and the hole 26a of the die 26, it can be set to an arbitrary height dimension.
[0021]
Further, the surface roughness and accuracy of the taper peripheral surface 31 are determined by the surface state of the taper surface 27a of the taper forming punch 27. Therefore, by setting the taper surface 27a to an appropriate value, the taper peripheral surface 31 is set. The surface roughness and accuracy can be arbitrarily set. By such a prior setting, the metal cup body 30 itself and the tapered peripheral surface 31 on the outer periphery of the opening end can be processed with high accuracy.
[0022]
Since the metal cup body 30 formed as described above forms a metal plate manufactured by rolling by drawing and pressing, the rolling direction 12 of the element body 11 is indicated by an arrow shown in FIG. Is formed in a substantially U-shaped cross section communicating with the cylindrical portion 11b and the bottom portion 11c. As a result, the strength of the metal cup body 30 can be increased.
[0023]
In the above-described embodiments, the circular shape is shown as an example, but it is needless to say that it may be formed in a polygonal shape such as a substantially rectangular shape or a substantially hexagonal shape. The metal cup body 30 can also be formed in a different shape, for example, one of the inner hole shape and the outer diameter shape is circular and the other is polygonal. Further, the tapered peripheral surface 31 formed on the outer periphery of the opening end of the metal cup body 30 does not necessarily have a semiconical shape, and the shape of the tapered surface 27a formed on the inner peripheral surface of the bottom of the taper forming punch 27 is changed to a triangular wave or the like. It is possible to form a tapered peripheral surface of any shape if it is deformed into a surface shape such as unevenness, a tapered peripheral surface is formed in a necessary part, or a taper angle is partially varied. The present invention is not limited to the above-described embodiments and can be appropriately changed without departing from the present invention.
[0024]
【The invention's effect】
As described above, according to the present invention, punching and drawing are consistently processed on a metal plate by a press, so that productivity can be significantly increased, and as a result, manufacturing cost can be reduced. Moreover, the metal cup body itself and the tapered peripheral surface of the outer periphery of the opening end can be processed with high accuracy without variation. Moreover, since the rolling direction of the metal plate communicates with the cylindrical portion and the bottom portion, the strength of the metal cup body can be increased, which is suitable when high strength and particularly high accuracy is required for the tapered peripheral surface depending on the application. A metal cup body can be manufactured easily.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a metal cup body manufactured by a method for forming a tapered peripheral surface according to the present invention.
FIG. 2 is a cross-sectional view showing a punching process of the present invention.
FIG. 3 is a cross-sectional view showing a drawing process of the present invention.
FIG. 4 is a cross-sectional view showing a taper circumferential surface forming step of the present invention.
FIG. 5 is a cross-sectional view showing another punching process according to the present invention.
FIG. 6 is a cross-sectional view showing the rolling direction of the metal cup body.
FIG. 7 is an explanatory view showing a method of forming a tapered peripheral surface in a conventional metal cup body.
FIG. 8 is an explanatory view showing a rolling direction of a metal cup body manufactured from a conventional metal rod body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Metal plate raw material 11 Element body 11b Cylindrical part 22 Punch punch 23 Punch die 25 Drawing punch 26 Die 27 Taper formation punch 27a Tapered surface 30 Metal cup body 31 Tapered peripheral surface

Claims (2)

A method of forming a metal cup body having a tapered peripheral surface from the metal plate to the outer periphery of the opening end,
Punching process for punching the metal plate material and curving the metal plate material to form a substantially dish-shaped body,
A drawing step of forming a cylindrical portion by drawing the element body;
A taper peripheral surface forming step of forming a taper peripheral surface on the outer periphery by pressing a punch having a taper surface on the inner peripheral surface from the opening end of the cylindrical portion. Method. The method for forming a tapered peripheral surface of a metal cup body according to claim 1, wherein the rolling direction is formed in a substantially U-shaped cross section in which the cylindrical portion and the bottom portion are continuous.

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