JP3373619B2 - Press molding method for annular molded products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for press molding an annular molded product.

[0002]

2. Description of the Related Art For example, as shown in FIG.
1. When press-molding a ring-shaped molded product M1 having an outer diameter d2, large material loss portions R1 occur inside the inner ring portion and outside the outer ring portion as indicated by the diagonal lines in the figure. Further, when a ring-shaped molded product M2 having an inner diameter and an outer diameter as shown in FIG. 12 that have d3 and d4 larger than M1 is press-molded, the waste portion indicated by R2 in the figure increases further than R1. The material loss part in the ring-shaped molded products such as such ring-shaped molded products cannot be easily reused and is often discarded as scrap, resulting in waste of resources and industrial waste. The processing cost as a thing was also increasing.

However, in this type of annular molded product,
Although it is unavoidable that a material loss portion is generated inside the inner ring portion and outside the outer ring portion, if an inner ring portion and an outer ring portion smaller than the inner ring portion and the outer ring portion of a predetermined size are used, the material loss portion is lost. Can be kept lower. That is. Molded product M1 in FIG. 11 to molded product M in FIG.
If 2 can be molded, material loss is from R2 to R1
It can be reduced to.

[0004]

The present invention has been proposed on the basis of such an idea, and in press molding of a ring-shaped molded product, material loss is reduced and effective use of resources is achieved. The purpose is to reduce the processing cost of industrial waste. In addition, this invention,
The present invention proposes a press molding method that can be efficiently and simply realized by using a continuous process in the conventional press molding without special capital investment.

[0005]

[Means for Solving the Problems] That is, according to the invention of claim 1, a step of punching and molding a first annular material molded product having an inner ring portion and an outer ring portion from a plate-shaped material, and the first annular material molded product The expansion member is provided on the inner ring portion, and the expansion member is pushed and expanded by the taper-shaped pressing member.
Molding a second annular material molded product having a large inner ring portion and a large outer ring portion that are larger than the annular material molded product;
The present invention relates to a method for press-molding a ring-shaped molded product, which comprises a step of press-molding the ring-shaped molded product into a ring-shaped molded product having a predetermined shape.

According to a second aspect of the present invention, in the first aspect, the first annular material molded article molding step, the second annular material molded article molding step, and the annular molded article molding step have a single press device. The present invention relates to a method for press-molding an annular molded product, which is realized by a continuous process.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 is a plan view schematically showing a molded product in each step of the method of the present invention, FIG. 2 is a sectional view showing a process of molding a first annular material molded product into a second annular material molded product, and FIG. 3-3 is a cross-sectional view, FIG. 4 is a cross-sectional view showing the expanded state, FIG. 5 is a cross-sectional view showing a step of press-molding an annular molded product having a predetermined shape, and FIG. FIG. 7 is a conceptual view of a press machine, FIG. 7 is a perspective view showing an example of an annular molded product obtained by the method of the present invention, FIG. 8 is a perspective view showing another example, and FIG. 9 is a perspective view showing another example.
FIG. 10 is a perspective view showing still another example.

As shown in FIG. 1, the press molding method of the present invention comprises a step of obtaining a first annular material molded product 11 and a molding of the first annular material molded product 11 into a second annular material molded product 20. And a step of press-molding the second annular material molded product 20 to obtain an annular molded product 30 having a predetermined shape. Examples of the plate-shaped material that can be favorably molded by the molding method of the present invention include metal plate materials that can be molded by known press molding, such as stainless steel, aluminum, iron, and copper.

First, a plate-shaped material 10 having an appropriate thickness is punch-molded by a known punching device, and an inner ring portion 12 and an outer ring portion 1 are formed.
A ring-shaped first annular material molded product 11 having 3 is obtained.

First annular material molded product 1 obtained in the above process
1 is an expansion device 23 as shown in FIGS.
Is molded into the second annular material molded product 20. The expansion device 23 includes a die 25, an expansion member 26, and a tapered pressing member 27, and is mounted on a base 24.

The die 25 is the first annular material molding 11
Is formed in a ring shape having an inner ring 28 having a diameter smaller than that of the inner ring portion 12, and the first annular material molded product 11 is arranged on the upper surface thereof. As can be seen from FIGS. 2 and 3, the expansion member 26 is formed in a substantially fan shape and includes an expansion portion 29 and a taper groove 39, and a plurality of the expansion member 26 and the expansion groove 29 are combined in a ring shape. It is placed on the top surface. In this example, the nine expansion members 26 form one ring.

The expansion portion 29 of the expansion member 26 is provided on the lower surface side of the expansion member 26 so as to project in an arc shape, and the inner ring portion 1 of the first annular material molded product 11 arranged on the die 25.
The inner ring part 12 is expanded by engaging with 2. This extension 2
The height of 9 is formed to be substantially the same as the thickness of the first annular material molded product 11. The tapered groove 39 is formed on the inner circumference of the ring-shaped expansion member 26 so as to have a smaller diameter toward the lower side of the device, and a tapered pressing member 27 described later is slidably fitted therein.

The tapered pressing member 27 is supported on the expansion member 26 by a spring S, and is vertically movable in the die 25 direction by a pressing device (not shown) or the like. This tapered pressing member 27
Moves downward in the direction of the die 25 while slidingly contacting the tapered groove 39 of the expansion member 26, thereby expanding the expansion member 26 outward. Along with this, as shown in FIG. 4, the inner ring portion 12 of the first annular material molded product 11 is expanded to gradually expand the inner ring portion 12 and the outer ring portion 13. In this way, the second annular material molded product 20 having the large inner ring portion 21 and the large outer ring portion 22 larger than the first annular material molded product 11 is molded.

The large inner ring portion 2 of the second annular material molding 20
1 and the large outer ring portion 22 are expansion-molded to a size required for an annular molded product of a desired size, and press-molded into an annular molded product having a predetermined shape in the next step.

As shown in FIG. 5, the second annular material molded product 20 is set in the press device 40. The pressing device 40 includes a die 42, a punch 43, and a stripper 44, and is mounted on a base 41. The die 42 is formed with a molding portion 45 formed in the shape of the target annular molding product, and the second annular material molding product 20 obtained by the above process is placed in the molding portion 45.
The second annular material molded product 20 is molded into an annular molded product having a predetermined shape by pressing the punch 43 from the upper surface of the molding portion 45 via the stripper 44.

In the present invention, theoretically, the thickness of the molded product is thinned in the step of expanding the first annular material molded product 11 into the second annular material molded product 20. Therefore, if necessary, it is possible to select a material having a necessary thickness in advance for the wall thickness required for the final molded product.

Further, the method of the present invention can be efficiently carried out by the continuous pressing apparatus 60 defined as the invention of claim 2 and shown in FIG. In the figure, reference numeral 61 is a punching portion, 62 is an expansion portion, and 63 is a molding portion.
It is operated by a single pressing device 64. This device 6
According to 0, the first annular material molded product 11 is molded by the punching part 61, the second annular material molded product 20 is molded by the expansion part 62, and the final annular molded product 30 is molded by the molding part 63. Then, by sequentially transferring each molded product of each process to the next process, it becomes possible to perform continuous molding simultaneously by a single press device 64.

7 to 10 show examples of annular molded articles obtained by the press molding method of the present invention. FIG. 7 shows an annular molded product 70 in which a convex portion 71, 71, 71 ... FIG. 8 shows an annular molded product 80 in which the outer ring part is molded as the flange part 81. Further, FIG. 9 shows an example in which the annular molded product 90 is formed into a substantially square shape as shown in the drawing. In the figure, reference numeral 91 is an inner ring portion, and 92 is an outer ring portion. Further, FIG. 10 shows an example in which the annular molded product 100 has a polygonal shape (a hexagon in this example) and the inner flange portion 101 and the outer flange portion 102 are formed.

[0019]

As shown and described above, according to the method of the present invention, a small-diameter molded product is expanded-molded from a small-diameter molded product by using a material smaller than the originally used material. Therefore, although the wall thickness may be slightly thin, since it is possible to mold an annular molded product of a desired size without using a large material from the beginning, the material of the annular molded product can be press-molded. It is possible to reduce the loss. Therefore, not only the resources are effectively used, but also the generation of industrial waste can be suppressed to be small and the processing cost can be reduced. Furthermore, the method of the present invention can be carried out extremely efficiently and simply by using the continuous process in the conventional press molding.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing a molded product in each step of the method of the present invention.

FIG. 2 is a cross-sectional view showing a step of molding a first annular material molded product into a second annular material molded product.

FIG. 3 is a sectional view taken along the line 3-3.

FIG. 4 is a sectional view showing the expanded state.

FIG. 5 is a cross-sectional view showing a step of press-molding an annular molded product having a predetermined shape.

FIG. 6 is a conceptual diagram of a press device for carrying out the method of the present invention.

FIG. 7 is a perspective view showing an example of an annular molded product obtained by the method of the present invention.

FIG. 8 is a perspective view showing another example of the same.

FIG. 9 is a perspective view showing still another example.

FIG. 10 is a perspective view showing still another example.

FIG. 11 is a plan view showing an example of a press molding method for a general annular molded product.

FIG. 12 is a plan view showing an example of a press molding method for a larger-diameter annular molding.

[Explanation of symbols]

10 Plate material 11 First annular material molded product 12 Inner ring 13 Outer ring 20 Second annular material molded product 21 Large Inner Ring 22 Large outer ring 30 annular molded products

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21D 53/16 B21D 41/02 B21D 53/20

Claims (2)

(57) [Claims] 1. A step of stamping and molding a first annular material molded product having an inner ring part and an outer ring part from a plate-shaped material, and an expansion member is provided on the inner ring part of the first annular material molded product and the expansion member is tapered. Forming a second annular material molded product having a large inner ring portion and a large outer ring portion that are larger than the first annular material molded product by expanding with a circular pressing member; A method for press-molding a ring-shaped molded article, which comprises a step of press-molding a ring-shaped molded article. 2. The method according to claim 1, wherein the molding process of the first annular material molded product, the molding process of the second annular material molded product, and the molding process of the annular molded product are realized by a continuous process in a single press device. Press molding method for annular molded products.