JP3803986B2 - Two-panel simultaneous drawing method for hollow panel-shaped product material, press apparatus used therefor, and method for manufacturing hollow insulator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a technical field of a method of drawing two sheets of a sheet material forming a panel-shaped product having a hollow part at the same time, a press apparatus used therefor, and a method of manufacturing a hollow insulator as a panel-shaped product having a hollow part. Belonging to.
[0002]
[Prior art]
For example, an insulator manufactured by pressing a metal plate is used in places where conditions are severe, such as for heat insulation of a muffler. In some cases, the hollow portion may be formed because the effect is further improved. When used for heat insulation of this muffler, etc., a concave hollow portion is required due to dimensional restrictions, and the two sheets are overlapped and the two drawn parts are squeezed in the same direction. In this case, since the depths of the two drawn parts do not match, conventionally, the metal plate for the one surface side and the metal plate for the other surface side are provided by drawing with separate dies.
[0003]
[Problems to be solved by the invention]
However, the conventional method of drawing two metal plates with different molds has the following problems.
(1) At least two sets of press (drawing) dies are required, and the work process for that is also required, resulting in an extra manufacturing cost.
(2) When changing the shape of the drawing part on either the one side or the other side, one set of press dies must be changed, which increases costs.
(3) At the time of drawing, the metal plate is in metal contact on both sides and the flow is poor and the workability is poor.
[0004]
The problem to be solved by the present invention is to produce a hollow panel-shaped product by stacking two molding materials together in order to provide a hollow portion inside, such as an insulator arranged on the back of an automobile muffler. A highly practical method capable of drawing a plate material, a press device used therefor, and the hollow panel-like product at the same time on the inner and outer surfaces of one pressing die, and also corresponding to the difference in the shape of the molded part on the inner and outer surfaces The object is to provide a method for manufacturing an insulator.
[0005]
[Means for Solving the Problems]
(Solution 1)
In order to achieve the above object, in the two-sheet simultaneous drawing method of the hollow panel-shaped product material according to claim 1, the hollow plate-shaped product is formed on the outer plate that forms one surface side of the hollow plate, leaving a peripheral edge, and forming a recess. A first step of making the hollow portion larger than the hollow portion volume set in the hollow panel-shaped product; and inserting the outer plate into a lower press mold to fill the hollow portion with the fluid, and further forming the other side of the hollow panel-shaped product A second step of placing an inner plate to be placed on the upper surface of the outer plate; the leakage of the fluid is substantially prevented at the time of drawing with the upper die from above the inner plate, and the two plates can be slid into the die by a force A third step of pressing the entire outer periphery; and a fourth step of lowering the press upper die and forming the outer plate with the lower die and forming the inner plate with the upper die through the fluid during drawing. It is characterized by that.
[0006]
In this way, when pressing from the inner plate side while pressing the outer peripheral edge of the outer plate and the inner plate, the internal fluid transmits the resistance force of the outer plate as it is, so the upper plate is in close contact with the upper mold. The outer plate is drawn downward, and the outer plate is pressed from the fluid by being drawn down in the lower die direction of the inner plate and is formed in close contact with the lower die. Therefore, the inner plate and the outer plate can be simultaneously formed with a set of molds. In this case, the inner plate is in contact with only the fluid on the lower surface side, and the outer plate is in contact with only the fluid on the upper surface side, so that the inner plate and the outer plate can be molded as different shapes. it can. In addition, since one surface side of the drawn portion is in liquid contact, the material flow is improved and workability can be improved.
[0007]
(Solution 2)
In the press apparatus used for the two-sheet simultaneous drawing method of the hollow panel-shaped product material according to claim 2, both the outer plate and the inner plate forming one side and the other side of the hollow panel-shaped product are overlapped. A lower mold having a shape on one side of a hollow portion set for a hollow portion provided between the plates; and a shape on the other side of the hollow portion set for the hollow portion; An upper die; and the outer plate is preliminarily filled with a fluid in a hollow portion that is a base for drawing formed on the outer plate. And a wrinkle presser that presses against the upper surface of the lower mold while being in close contact with each other so as to substantially prevent leakage.
[0010]
(Solution 3 ) In the method for manufacturing a hollow insulator according to the third aspect of the present invention, a hollow portion is formed on the outer plate for forming one surface side of the hollow insulator main body, leaving a peripheral portion thereof, and the hollow portion is formed into the hollow insulator. A first step in which the volume of the hollow portion set in the main body is set larger than the volume of the hollow portion; the outer plate is placed in a lower press mold, the hollow portion is filled with a fluid, and the inner plate forming the other surface side of the hollow insulator main body is further formed in the outer plate A second step of placing on the upper surface; pressing the entire outer periphery of the plate with a force capable of sliding both of the plates into the mold while substantially preventing leakage of the fluid during drawing with a press upper die from above the inner plate A third step; a fourth step of lowering the upper die and forming the outer plate with the lower die via the fluid during drawing and forming the inner plate with the upper die; and removing the fluid from the recess of the outer plate. After disposal, match the outer and inner plates together And a fifth step of fixing the master.
[0011]
In this way, the outer plate and the inner plate are simultaneously provided with drawn portions having substantially the same opening surface, and then the outer plate fluid is discarded, the outer plate and the inner plate are combined, and the peripheral portions are welded together. Thus, a hollow insulator is provided. In this case, by assembling the outer plate and the inner plate again in accordance with the state at the time of drawing, a hollow portion in which the inner plate side is recessed and the outer plate side protrudes is formed, and by assembling the opening surfaces facing each other, An insulator having a hollow portion protruding on both sides is provided.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the manufacturing process of an insulator for heat insulation of an automobile muffler will be described as an example.
[0013]
FIG. 1 is a process diagram showing a manufacturing process of an insulator for heat insulation of an automobile muffler according to an embodiment.
First, as shown in FIG. 1 (a), the outer plate 1 constituting one surface side (outer side) of the insulator is preliminarily formed with a flange 1a on the entire outer peripheral edge and a depression 1b serving as a diaphragm base. Keep it. The volume M of the hollow portion 1b is set to be appropriately larger than the volume m (see FIG. 1 (e)) of the hollow portion 7 provided inside the insulator after assembling.
[0014]
Next, as shown in FIG. 1 (b), after the hollow portion 1b of the outer plate 1 is inserted into the lower press mold 3 of the press device B and the hollow portion 1b is filled with a liquid 5 such as machine oil as a fluid. The inner plate 2 constituting the other surface side (inner side) of the insulator is aligned with the outer plate 1 and placed thereon.
[0015]
Next, as shown in FIG. 1C, the entire edge of the inner plate 2 (which becomes the flange 2a after drawing) is pressed by the wrinkle presser 6. In this case, both the outer plate 1 and the inner plate 2 are slid into the lower mold 3 in accordance with the drawing process and are pressed with a force that prevents the internal liquid from leaking as much as possible.
[0016]
Next, as shown in the figure (d), the press upper die 4 is lowered and drawn. When the upper die 4 is lowered to the lowest position, the outer plate 1 is provided with a drawing portion 1c for one surface side of the insulator on the upper surface of the lower die 3, and the inner plate 2 is provided with the lower surface of the upper die 4 by the lower surface of the insulator. The drawing part 2c for the other side is provided at the same time, and a hollow part 7 having a volume m is formed between the drawing parts 1c and 2c. At this time, the lowering speed of the upper mold 4 and the volume M of the recess 1b are set in an optimal state by performing this process in advance. Thereafter, as shown in FIG. 1 (e), after the outer plate 1 and the inner plate 2 are removed from the press mold and the liquid is discarded, the flanges 1a and 2a are overlapped again so that the hollow portion 7 becomes concave. The insulators A are assembled by spot welding p at appropriate intervals.
[0017]
Next, the operation will be described.
[0018]
When the flanges 1a and 2a between the outer plate 1 and the inner plate 2 are pressed from the inner plate 2 side while being pressed by the wrinkle presser 6, the internal liquid 5 transmits the resistance force of the outer plate 1 as it is against this pressing force. Therefore, the inner plate 2 is formed by drawing the liquid 5 in close contact with the mold 4 due to the resistance force, and the outer plate 1 is pressed from the liquid 5 by the lowering of the inner plate 2 in the lower die 3 direction. 3 is molded in close contact. Therefore, the inner plate 2 is formed according to the shape of the upper die 4, and the outer plate 1 is formed according to the shape of the lower die 3. In this way, both the outer plate 1 and the inner plate 2 can be simultaneously molded with a set of molds. In this case, since the inner plate 2 is in contact with only the liquid 5 on the lower surface side and the outer plate 1 is in contact with only the liquid 5 on the upper surface side, the inner plate 1 and the outer plate 2 may have different shapes. Can be molded. In addition, since one surface side of the narrowed portion is in liquid contact, the material flow is improved and workability can be improved.
[0019]
Since the upper mold speed at the time of the drawing process is related to the amount of leakage of the liquid, it is set so as to satisfy the following formula.
[0020]
Depression volume M of outer plate 1 = hollow volume m after processing + leakage amount α during processing of liquid α
Next, the effect will be described.
[0021]
In the present embodiment, the outer plate 1 forming one surface side of the insulator of the muffler of the automobile is formed with a flange 1a at the peripheral portion thereof to form the recess 1b, and the volume M of the recess 1b is set as the insulator. A first step of making the hollow portion 7 larger than the volume m; the outer plate 1 is placed in the press lower mold 3, the hollow portion 1 b is filled with the liquid 5, and the inner plate 2 forming the other surface side of the insulator is further formed as the outer plate. (1) a second step of placing on the upper surface; a force that can substantially prevent leakage of the liquid 5 during drawing with the upper die 4 from above the inner plate 2 and allow both plates 1 and 2 to slide into the lower die 3 A third step of pressing the flange 1a of the outer plate 1 and the entire outer peripheral edge of the inner plate 2; lowering the upper die 4 and forming the outer plate 1 with the lower die 3 through the liquid 5 during the drawing process; And a fourth step of molding with the upper mold 4; When an insulator placed on the back side of the fuller is manufactured by stacking two molding materials in order to provide a hollow portion 6 inside, the inner and outer surfaces of the press upper die 3 and the lower die 4 can be made simultaneously. Corresponding to the difference in the shape of the molded part on the outer surface, the plate material can be drawn.
[0022]
(Other embodiments)
The embodiment has been described by taking an example of a heat insulation insulator for a muffler of an automobile as an example of a hollow panel-shaped product. However, the present invention can be used for manufacturing a safety cover, a heat insulating cover, a lid, and the like.
[0023]
Further, in the embodiment, the liquid has been described as an example of the fluid, but the same effect can be obtained in the clay state and the powder.
[0024]
【The invention's effect】
In the two-sheet simultaneous drawing method of the hollow panel-shaped product material according to claim 1, the outer plate that forms one surface side of the hollow panel-shaped product is formed with a recessed portion leaving the peripheral portion, and the recessed portion is formed. A first step of making the hollow panel-shaped product larger than the volume of the hollow portion; and an inner plate that forms the other surface side of the hollow panel-shaped product by placing the outer plate in the lower die and filling the hollow portion with the fluid. A second step of placing on the upper surface of the outer plate; the outer peripheral edge of the plate with a force that substantially prevents leakage of the fluid during drawing with the upper die from above the inner plate and allows both plates to slide into the die. A fourth step of lowering the upper die and forming the outer plate with the lower die and forming the inner plate with the upper die via the fluid during drawing processing. The outer plate can be molded simultaneously with a set of molds. Further, the inner plate is in contact with only the fluid on the lower surface side, and the outer plate is in contact with only the fluid on the upper plate side, so that the inner plate and the outer plate can be formed as different shapes. . In addition, since one surface side of the drawn portion is in liquid contact, excellent effects such as improved material flow and improved workability can be obtained.
[0025]
In the press apparatus used for the two-sheet simultaneous drawing method of the hollow panel-shaped product material according to claim 2, the outer plate and the inner plate forming one side and the other side of the hollow panel-shaped product are overlapped. A lower mold having a shape on one side of the hollow portion set for the hollow portion provided inside the two plates; and a shape on the other side of the hollow portion set for the hollow portion; An upper die having; a state in which the outer plate is preliminarily filled with a fluid in a hollow portion to be a squeeze base formed on the outer plate, and the inner plates are overlapped so that all the outer peripheral edges of both plates are And a wrinkle presser that presses against the upper surface of the lower mold in a state of being in close contact so as to prevent leakage of the fluid. Therefore, the same excellent effect as that of the first aspect of the invention can be obtained.
[0027]
In the method for manufacturing a hollow insulator according to claim 3, a hollow portion is formed by leaving a peripheral portion of the outer plate for forming one surface side of the hollow insulator body, and setting the hollow portion to the hollow insulator body. A first step in which the outer plate is placed larger than the volume; a second step in which the outer plate is placed in a press lower mold and the hollow portion is filled with a fluid, and an inner plate forming the other surface side of the hollow insulator body is placed on the upper surface of the outer plate. And a third step of substantially preventing leakage of the fluid during drawing with the upper die from above the inner plate and pressing the entire outer periphery of the plate with a force that allows both plates to slide into the die; A fourth step of lowering the die and forming the outer plate with the lower die and forming the inner plate with the upper die through the fluid during the drawing process; and after discarding the fluid from the recess of the outer plate, the outer plate Fifth craft that joins the inner plate and the peripheral edges together Therefore, the outer plate and the inner plate are simultaneously provided with drawing portions having substantially the same opening surface, and then the fluid of the outer plate is discarded. A hollow insulator can be easily manufactured by fixing parts by welding or the like. In this case, when the outer plate and the inner plate are assembled again in accordance with the state at the time of drawing, an insulator having a hollow portion in which the inner plate side is recessed and the outer plate side protrudes is manufactured, and the opening surfaces are opposed to each other. By manufacturing the insulator with the hollow part protruding on both sides, and changing the shape of the upper and lower molds, it is possible to manufacture an insulator with different inner and outer surface shapes by performing only one drawing process. The effect that it can do is acquired.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a process diagram showing a manufacturing process of a heat insulation insulator for an automobile muffler using a hollow two-sheet pressing method according to an embodiment of the present invention.
[Explanation of symbols]
A Automotive heat insulation insulator B Press device M Volume of hollow portion provided in outer plate Volume 1 of hollow portion provided in insulator 1 Outer plate 1c Drawing portion 1a of outer plate Flange 1b provided on outer plate Recessed portion 2 provided on the outer plate 2 Inner plate 2a Flange 2c provided on the inner plate 3 Drawing forming portion 3 of the inner plate Lower die 4 Upper die 5 Liquid 6 Wrinkle presser 7 Hollow portion of the insulator

Claims (3)

A first step of forming a hollow portion on the outer plate forming one surface side of the hollow panel-shaped product, leaving a peripheral edge thereof, and making the hollow portion larger than a hollow volume set in the hollow panel-shaped product;
A second step in which the outer plate is placed in a press lower mold and a hollow is filled with a fluid, and an inner plate that forms the other side of the hollow panel product is placed on the outer plate;
A third step of substantially preventing leakage of the fluid during drawing with an upper die from above the inner plate and pressing the entire outer periphery of the plate with a force that allows both plates to slide into the die;
A fourth step of lowering the upper die and forming the outer plate with the lower die and forming the inner plate with the upper die through the fluid during the drawing process;
A method for simultaneously drawing two sheets of a hollow panel-shaped product material, comprising: The hollow part has a shape on one side of the hollow part set for the hollow part provided inside the two plates in a state where the outer plate and the inner plate that form the one side and the other side of the hollow panel product are overlapped. A lower mold to which a plate is attached;
An upper mold having a hollow part other side shape set for the hollow part;
In the state in which the outer plate is preliminarily filled with the fluid in the recesses that are formed on the outer plate and become the base for drawing, the inner plate is overlaid and the outer peripheral edges of both plates are almost leaked together. A wrinkle presser that presses against the upper surface of the lower mold in a close contact state to prevent;
A press apparatus used for a method for simultaneously drawing two hollow panel-shaped product materials. A first step of forming a recess portion on the outer plate for forming one surface side of the hollow insulator body, leaving a peripheral portion thereof, and making the recess portion larger than a hollow portion volume set in the hollow insulator body;
A second step in which the outer plate is placed in a lower die and the hollow portion is filled with a fluid, and an inner plate forming the other surface side of the hollow insulator body is placed on the upper surface of the outer plate;
A third step of substantially preventing leakage of the fluid during drawing with an upper die from above the inner plate and pressing the entire outer periphery of the plate with a force that allows both plates to slide into the die;
A fourth step of lowering the upper die and forming the outer plate with the lower die and forming the inner plate with the upper die through the fluid during the drawing process;
After discarding the fluid from the depression of the outer plate, the fifth step of combining the outer plate and the inner plate and fixing the peripheral portions;
A method for producing a hollow insulator, comprising:

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