JP3913417B2 - Split forming method in press working and mold apparatus therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a split molding method in press working that can perform press work more than the capability by performing press work multiple times without replacing the mold with a low-capacity press device, and a technical field of the mold device. Belongs.
[0002]
[Prior art]
Conventionally, in a forming process in press working, when the limit drawing ratio is not exceeded, it is common to form an outer shape or a pattern such as a bead in one process. Therefore, at this time, the pressurization capacity of the press machine necessary for molding is determined by the shape and pattern of the product, and the machine having a margin in the pressurization capacity is selected.
In this case, parts are integrated as a means for pursuing cost competitiveness.
For example, in Japanese Patent No. 2676254, there is a method of forming an exhaust muffler by pressing a single sheet material to obtain an outer shell integrally including a plurality of chambers, an outer peripheral flange, a tube insertion flange, and the like. Are listed.
As part integration progresses in this way, the size of the part has increased, and a press machine with higher pressurization capacity has been required. As a result, parts that cannot be machined by the pressurization capability of hand-held machines are becoming apparent. As a countermeasure,
(1) New introduction of large press machine,
(2) Outsourcing
(3) There are parts division.
[0003]
[Problems to be solved by the invention]
However, in the above solution, there is a problem in that it goes against the component integration effect for enhancing the original cost competitiveness and the effect is lost.
Such a problem will be specifically described with reference to a component configuration of a muffler main body using press work shown in FIG. 1, for example.
The shell 50 has a two-part structure of an upper 51 and a lower 52, and continues to a relatively thick class with a plate thickness of 2 mm. A bead shape 53 is set on the shell surface for the purpose of improving the radiated sound characteristics and freezing the shape. The required pressing force (molding force) of this part is determined by a value obtained by adding the outer peripheral length and the bead peripheral length, the plate thickness, and the tensile strength of the material, and a press with a considerably high pressing ability is required. Here, for the sake of convenience, the production method will be described assuming that the outer shape forming force is 250 tons and the bead forming force is 350 tons.
(1) Case 1; When producing on a tandem line with 3 or more 400 ton presses,
The outer shape is processed in the first step (No. 1 press) (see FIG. 5 (a)),
The bead shape is processed in the second step (No. 2 press) (see FIG. 5 (b)),
Trim and piercing is performed in the third step (see Fig. 5 (c)).
The restriction of the pressurization capacity of the machine is removed. However, since two molds are required in the molding process, there remains a problem that is disadvantageous in terms of cost.
(2) Case 2; When producing with one 400-ton press, the production process is the same as Case 1, but since there is only one machine, it will be processed one step at a time. A dump production system in which the next process is processed while exchanging the parts, and in addition to the problem of case 1, there arises a problem that the productivity is greatly reduced.
[0004]
The problem to be solved by the present invention is to provide a split molding method in press working and a mold apparatus thereof, which are highly productive and can obtain a press-molded product advantageously in terms of cost.
[0005]
[Means for Solving the Problems]
(Solution 1)
In order to achieve the above object, according to the first aspect of the present invention, the same material is pressed a plurality of times with the same mold, and part or all of the internal pattern machining elements are formed from the inner surface of the mold during the press after the first press. The method of providing a press-molded product by continuing the press work until it has been advanced and processed to finish all of its processing elements.
Therefore, since the press working element is separated into two working elements, that is, a processing element having only an outer shape and a processing element having only a bead shape, it is possible to change the die even in a press machine having a small capacity so that the press working element cannot be processed at one time. It can be processed by one unit.
In addition, since there is no need to change the mold setup or transfer to a separate press machine, the processing time can be shortened, and the production of a separate mold is not required. Improvements can be made.
(Solution 2)
According to a second aspect of the present invention, in the split forming method in the press working according to the first aspect, the processing elements of the entire pattern in the outer shape are divided into one or a plurality in the mold, and the press is completed with one mold. A division molding method in press working, characterized in that a product is obtained.
Therefore, since all the press working elements are separated into two working elements, that is, a processing element having only an outer shape and a processing element having only a bead shape, the die can be used even in a press machine having a small capacity that cannot process all the press working elements at one time. One unit can be processed without replacement.
(Solution 3)
According to a third aspect of the present invention, there is provided a mold apparatus for use in the split forming method in the press working according to the first or second aspect, wherein the mold body is used for outer shape processing and has a concave portion opened in the processed surface. A movable punch for processing an internal pattern inside the mold body slidably housed in the recess, and advancing and retreating the movable punch until the tip of the movable punch protrudes from the processing surface of the mold to the press processing position. Means.
Therefore, the same effect as that of the first aspect of the invention can be obtained.
(Solution 4)
According to a fourth aspect of the present invention, the advancing / retreating means of the third aspect projects a set plate in which the upper end of the mold body is fixed and a cam having an upper surface formed on a sliding surface and one side surface formed on an inclined surface. And a cam slide fixed to the movable punch, and a lower surface formed on a sliding surface that faces the sliding surface of the cam of the cam slide, and one side is an inclined surface facing the inclined surface of the cam of the cam slide A cam plate having a cam portion formed on the lower surface of the set plate and slidably disposed on the lower surface of the set plate, and a tip of the movable punch in a state where the cam plates are slid to bring the sliding surfaces into a face-to-face state. And a cylinder that moves the movable punch forward until it protrudes from the working surface of the mold to the press working position and fixes the movable punch to the set plate.
Therefore, the same effect as that of the first aspect of the invention can be obtained.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, a case where muffler production is performed will be described as an example.
First, the configuration will be described.
FIG. 1 is a longitudinal sectional view showing a mold apparatus used in the division molding method in the press working according to the first embodiment, and FIG. 2 is a transverse sectional view, both of which are shown when an internal pattern is processed. 3 is a longitudinal sectional view showing the outer shape processing, and FIG. 4 is a transverse sectional view thereof.
[0007]
In the figure, 1 is a punch, 2 is a die, 3 is a movable punch, 4 is a blank holder, 5 is a set plate, 6 is a cam slide, 7 is a cam plate, 8 is a cylinder, and 9 is a spring.
[0008]
The punch 1 is provided with a plurality of rows of concave grooves 12 for bead processing on a processing surface 11.
The die 2 serves as a mold body of the apparatus, and a large number of recesses 14 are formed in the outer shape processing surface 13, and the recesses 14 are arranged at positions facing the recess grooves 12. It is provided so as to penetrate through the upper surface.
The movable punch 3 is provided in a shape for extruding a material along the inner surface of the concave groove 12, and is slidably accommodated in the concave portion 14, respectively.
The set plate 5 is fixed to the movable side of the press machine together with the die 2. Further, a cam storage chamber 15 is provided between the set plate 5 and the upper portion of the die, and the upper ends of the movable punches 3 are respectively fixed to the cam slide 6 integrally therewith.
[0009]
The cam slide 6 has a plurality of cams 16 arranged on the upper surface at equal pitches for each upper position of the movable punch 3, and the cam 16 has an upper surface formed on a sliding surface 17 and one side surface in the same direction. Formed on the inclined surface 18.
The cam plate 7 has a cam portion 21, the lower surface of the cam plate 21 is formed on a sliding surface 19 that faces the sliding surface 17 of the cam 16 of the cam slide, and one side surface is formed on an inclined surface 20. The inclined surface 20 is slidably disposed on the lower surface of the set plate 5 so as to face the inclined surface 18 of the cam 16 in the cam storage chamber 15.
The cylinder 8 is connected to the cam plate 7 and slides the cam plate 7 along the set plate 5. When the piston 8 is moved backward, the cylinder 8 disengages the sliding surfaces 17 and 19 and raises the movable punch 3 with the urging force of the spring 9 so that the tip of the movable punch 3 is moved to the die 2. When the piston is moved forward and the inclined surfaces 18 and 20 are slipped in a face-to-face state, the movable punch 3 is pushed down and its tip is processed into the outer shape of the die 2. 13 is provided so as to protrude from 13.
[0010]
Next, the function and effect will be described with reference to FIG.
As a first step, first, the cam plate 7 is moved backward by the cylinder 8 and the movable punch 3 is lifted by the urging force of the spring 9 to be stored in the recess 14.
Next, after the material is set, the press machine is operated (first shot), and the outer shape of the shell upper 51 is formed only by the die 2 (see FIG. 5A).
Next, as a second step, after the die 2 and the punch 1 are separated, the movable punch 3 is lowered from the outer shape processing surface 13 by the cylinder 8 and the tip portion is protruded to operate the press machine. When the die 2 is pressed again (second shot), the tip of the movable punch 3 enters the concave groove 12 inside the die 2. As a result, the material portion covering the groove 12 is pushed into the groove 12 to form the bead 53 (see FIG. 4B).
Trimming and piercing is performed in the third step (see FIG. 4C), and the muffler 50 is produced by fixing the shell lower 52 and the flange portions and fitting the end plates 54 at both ends in the fourth step. it can.
[0011]
As described above, in this embodiment, the die 2 as the die body is not replaced or reset to another press machine with one press machine and one die. The shell upper 51 having the bead 53 in the shape can be molded.
In this way, since all the press working elements of the shell upper 51 are separated into two working elements, that is, a processing element having only an outer shape and a processing element having only a bead shape, a press machine having a small capacity that cannot process all the press working elements at one time. However, it is possible to process with one unit without changing the mold. Therefore, no new investment is required to increase capacity.
The switching mechanism can be operated by operating the control valve of the cylinder 8 and can be produced easily and speedily.
Inter-process transfer including post-processing (trim, piercing, etc.) can be easily automated.
In addition, since there is no need to change the mold setup or transfer to a separate press machine, the processing time can be shortened, and the production of a separate mold is not required. Improvements can be made.
[0012]
Next, a second embodiment will be described.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the detailed description thereof will be omitted.
First, the configuration will be described.
FIG. 6 is a sectional view showing a mold apparatus according to the second embodiment.
In the mold apparatus according to the second embodiment, the first embodiment performs the storage in the concave portion 14 of the movable punch 3 by using the urging force of the spring 9, but the cylinder 30. In this case, by controlling the operation timing of the cylinder 8 and the cylinder 30, the cam slide 6 and the cam plate 7 can be manufactured at a low cost by eliminating the need for an inclined surface on the cam, and when the stroke and weight of the movable punch 3 are large. Is also suitable. The cylinder 30 may be disposed at the position of the spring 9.
[0013]
The embodiment of the present invention has been described above, but the specific configuration of the present invention is not limited to the embodiment, and design changes and the like without departing from the gist of the present invention are also included in the present invention. .
For example, when the structure of the movable punch 3 is simple, the spring 9 can be omitted.
[0014]
【The invention's effect】
In the split forming method in the press work according to claim 1, a part of the internal pattern processing element is formed from the inner surface of the mold when the same material is pressed a plurality of times with the same mold and after the first press. Or, since the method of providing a press-formed product by continuing the press work until all of the work elements have been processed by advancement and processing, even press machines with a small capacity that cannot process the press work elements at one time. One unit can be processed without changing the mold.
In addition, the processing time can be shortened, and it is not necessary to produce another mold, so that the mold cost can be reduced and the productivity can be improved.
[0015]
According to a second aspect of the present invention, in the split forming method in the press working according to the first aspect, the processing element of the entire pattern in the outer shape is divided into one or a plurality of pieces in the mold, and one mold is provided. Since a method of obtaining a press-finished product with a die is adopted, even a press machine having a small ability that cannot process all press-working elements at one time can be processed by a single machine without changing the die.
[0016]
According to a third aspect of the present invention, there is provided a mold apparatus for use in the division molding method for press forming according to claim 1 or claim 2, wherein the mold apparatus is used for the division molding in the press processing according to the first aspect. A mold main body for processing an outer shape and having a recess opened in a processing surface; a movable punch for processing an inner pattern inside the mold body slidably received in the recess; and the movable punch Since the structure includes the advancing / retreating means for advancing the movable punch until the tip protrudes from the processing surface of the mold to the press processing position, the same effect as that of the invention described in claim 1 can be obtained.
[0017]
In the invention according to claim 4, the advancing / retreating means according to claim 3 includes a set plate in which the upper end of the mold body is fixed, an upper surface formed as a sliding surface, and one side surface formed as an inclined surface. A cam slide projecting and fixed to the movable punch, and a lower surface is formed on a sliding surface facing the sliding surface of the cam of the cam slide, and one side faces the inclined surface of the cam of the cam slide A cam plate having a cam portion formed on an inclined surface that is slidably disposed on the lower surface of the set plate, and the sliding state of the sliding surfaces in a state where the cam plates are slid. Since the movable punch is advanced and the movable punch is fixed to the set plate until the tip of the movable punch protrudes from the processing surface of the mold to the press working position, the configuration is the same as that of the first aspect of the invention. The effect of It is.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a mold apparatus used for a division molding method in press working according to a first embodiment of the present invention and showing an internal pattern machining.
FIG. 2 is a cross-sectional view showing a mold apparatus used in the division molding method in press working according to the first embodiment and showing an internal pattern machining.
FIG. 3 is a longitudinal sectional view showing a mold apparatus used in the split forming method in press working according to the first embodiment and showing the outer shape processing.
4 is a cross-sectional view showing a mold apparatus used in the division molding method in press working according to the first embodiment and showing the outer shape machining. FIG.
FIG. 5 is an explanatory diagram showing a processing procedure of a muffler shell portion.
FIG. 6 is a cross-sectional view showing a mold apparatus used for a division molding method in press working according to a second embodiment and showing an internal pattern machining.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Punch 2 Die 3 Movable punch 5 Set plate 6 Cam slide 7 Cam plate 8 Cylinder 11 Punch processing surface 12 Punch groove 13 External processing surface 14 Movable punch recess 16 Cam slide cam 17 Cam slide cam Sliding surface 18 Cam slide cam inclined surface 19 Cam plate cam portion sliding surface 20 Cam plate cam portion inclined surface 21 Cam plate cam portion

Claims (4)

The same material is pressed multiple times with the same mold, and after pressing the first press, part or all of the internal pattern processing elements are advanced from the inner surface of the mold to finish and finish all the processing elements A split forming method in press working, wherein a press-formed product is provided by continuing the press work. 2. The split forming method in press working according to claim 1, wherein the working element of the entire pattern in the outer shape is divided into one or a plurality in the mold, and a press finished product is obtained with one mold. Split forming method in press working. A mold apparatus for use in the division molding method in press working according to claim 1 or 2,
A mold body having a concave portion which is for outer shape processing and opened in the processing surface;
A movable punch for processing the internal pattern of the outer shape, slidably housed in the recess of the mold body;
Advancing and retreating means for advancing the movable punch until the tip of the movable punch protrudes from the processing surface of the mold to the press processing position;
A mold apparatus for split molding in press working, comprising: The advancing / retreating means according to claim 3, wherein the upper end of the mold body is fixed;
A cam slide having an upper surface formed on a sliding surface and a side surface formed on an inclined surface and fixed to the movable punch;
The lower surface of the set plate has a cam portion formed on a sliding surface that faces the cam sliding surface of the cam slide, and one side surface is formed on an inclined surface facing the inclined surface of the cam of the cam slide. A cam plate slidably disposed on the
With the cam plate slid and the sliding surfaces in a face-to-face state, the movable punch is advanced to the set plate until the movable punch tip protrudes from the processing surface of the mold to the pressing position. A cylinder to be fixed;
A mold apparatus for split molding, characterized in that it is formed by.

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