JPH10263716A - Two-plate simultaneous drawing method for hollow panel shape product stock, press using it and hollow insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique having an excellent workability capable of simultaneously drawing two plate stocks with one press die in correspondence to the difference of the forming part shape in the inner and outer surfaces at the time of mutually superposing and manufacturing two formed stocks in order to provide a hollow part inside. SOLUTION: This hollow insulator is manufactured via a first process forming a flange 1a and a recessed part 1b in the outer plate 1 forming one surface side of the insulator or the like and forming the volume M of the recessed part 1b larger than the volume (m) of the hollow part 7 set in the insulator, a second process putting the outer plate 1 into a lower die 3, filling a liquid 5 in the recessed part 1b and placing the inner plate 2 forming the other surface side of the insulator on the outer plate 1, a third process pressing the whole outer peripheral edges of the flange 1a and the inner plate 2 using a blank holder 6 with the force possible to slide both plates 1, 2 into the die at the time of drawing, a fourth process forming the outer plate 1 with the lower die 3 and the inner plate 2 with the upper die 4 respectively via the liquid 5 at the time of drawing with the upper die 4, a fifth process superposing the outer plate 1 and the inner plate 2 and mutually fixing their peripheral edges after discharging the liquid 5 from the recessed part 1b of the outer plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for simultaneously drawing two sheet materials forming a panel-shaped product having a hollow portion, a press apparatus used therefor, and a hollow product as a panel-shaped product having a hollow portion. Belongs to the technical field of insulators and their manufacturing methods.

[0002]

2. Description of the Related Art For example, in an insulator manufactured by pressing a metal plate, if the insulator is used in a place where severe conditions are required, such as for heat insulation of a muffler, a single metal plate has a small effect, so that two sheets are stacked. If there is a hollow portion between them, the effect is further improved, so that the hollow portion may be formed. When this muffler is used for heat insulation, etc., a concave hollow portion is required due to dimensional restrictions. In this case, since the depths of the two drawn portions do not coincide with each other, conventionally, the metal plate for one surface and the metal plate for the other surface are provided by drawing using different molds.

[0003]

However, the above-mentioned 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 work steps for each are also required, resulting in extra production costs. (2) When changing the shape of the drawn portion on one side or the other side, one set of press dies must be changed, which increases costs. (3) During drawing, the metal plate is in metal contact on both sides, causing poor flow and poor workability.

[0004] The problem to be solved by the present invention is to produce a hollow panel-shaped product by superimposing two molded materials to form a hollow portion inside, such as an insulator disposed on the back of an automobile muffler. At the same time, one press mold simultaneously with the inner and outer surfaces, and also in response to the difference in the shape of the formed part of the inner and outer surfaces, a high practical value method capable of drawing a plate material, a press device used therefor, and the hollow panel shape An object of the present invention is to provide an insulator as a product and a manufacturing method thereof.

[0005]

[Means for Solving the Problems]

(Solution 1) In order to achieve the above object, in the method for simultaneously drawing two hollow panel-shaped product materials according to the first aspect of the present invention, a hollow is formed on an outer plate forming one surface side of the hollow panel-shaped product while leaving a peripheral portion thereof. A first step of forming a hollow portion and making the hollow portion larger than the hollow portion volume set in the hollow panel-shaped product; placing the outer plate in a lower press die, filling the hollow portion with a fluid, and further forming a hollow panel-shaped product. A second step of placing the inner plate forming the other surface on the upper surface of the outer plate; substantially preventing leakage of the fluid during drawing by the upper die from above the inner plate and allowing both plates to slide into the die A third step of pressing the entire outer peripheral edge of the plate with an appropriate force; a fourth step of lowering the upper die of the press and forming the outer plate with the lower die via the fluid at the time of drawing and the inner plate with the upper die. And;

As described above, when the outer plate and the inner plate are pressed from the inner plate side in a state where the outer peripheral edges thereof are pressed, the internal fluid transmits the resistance of the outer plate as it is, so that the upper plate becomes the upper die. The outer plate is pressed down from the fluid by being drawn down in the direction of the lower die, and is formed in close contact with the lower die. Therefore, the inner plate and the outer plate can be simultaneously molded by one set of molds. In this case, the inner plate is in contact with the fluid only on the lower surface side, and the outer plate is in contact with the fluid only on the upper surface side, and does not interfere with each other's shape. it can. Further, since the one surface side of the drawn portion comes into liquid contact, the material flow is improved, and the workability can be improved.

According to a second aspect of the present invention, there is provided a press apparatus for use in the method for simultaneously drawing two hollow panel-shaped product materials according to the second aspect of the present invention. A lower mold having a hollow portion one-sided shape set for a hollow portion provided inside the two plates in a state where the plates are superimposed and mounting the outer plate; and a hollow set for the hollow portion An upper die having a shape on the other side of the surface; and an inner plate which is overlaid on the outer plate in a state in which a fluid is filled in advance in a dent portion serving as a base for drawing formed on the outer plate. A wrinkle presser for pressing the upper surface of the lower mold in a state where all the outer peripheral edges are in close contact with each other so as to substantially prevent leakage of the fluid.

(Solution 3) In the hollow insulator according to the third aspect of the present invention, a hollow portion is formed on an outer plate for forming one surface side of the hollow insulator body, leaving a peripheral portion thereof, and the hollow portion is formed by the hollow insulator. A first step of increasing the volume of the hollow portion set in the main body; placing the outer plate in a lower press die to fill the recess with a fluid, and further forming the inner plate forming the other surface of the hollow insulator main body as the outer plate A second step of placing on the upper surface; substantially preventing leakage of the fluid at the time of drawing with a press upper die from above the inner plate, and pressing the entire outer peripheral edge of the plate with a force that allows both plates to slide into the die. Third
A fourth step of lowering the upper die and forming the outer plate with the lower die and the inner plate with the upper die via the fluid during the drawing process;
A fifth step in which the fluid is discarded from the concave portion of the outer plate, and the outer plate and the inner plate are joined together to fix the peripheral portions to each other.

As described above, the insulator of the present invention has a hollow portion formed by simultaneous drawing of the outer plate and the inner plate. This hollow part has the optimum shape on both sides by setting the necessary shape at the place where the insulator is used in the upper die and the lower die in advance, even though the outer plate and the inner plate are simultaneously drawn. Will have.

(Solution 4) In the method for manufacturing a hollow insulator according to the invention, a hollow portion is formed on an outer plate for forming one surface side of the hollow insulator body, leaving a peripheral portion thereof, and the hollow portion is formed. A first step of making the hollow insulator body larger than the volume of the hollow portion set therein; placing the outer plate in a press lower mold to fill the recess with a fluid, and further forming an inner plate forming the other surface side of the hollow insulator body. A second step of mounting on the upper surface of the outer plate; substantially preventing leakage of the fluid at the time of drawing by a press upper die from above the inner plate, and applying 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 via the fluid at the time of drawing and forming the inner plate with the upper die; After discarding the fluid,
A fifth step of joining the outer plate and the inner plate and fixing the peripheral portions together.

As described above, the outer plate and the inner plate are simultaneously provided with the drawn portions having substantially the same opening surfaces, and then the fluid of the outer plate is discarded. Is welded to provide a hollow insulator. In this case, in the case where the outer plate and the inner plate are assembled 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 with the opening surfaces facing each other, An insulator having a hollow portion protruding on both sides is provided.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, a manufacturing process of an insulator for heat insulation of a muffler of an automobile will be described as an example.

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), a flange 1a is previously formed on the entire outer peripheral edge of the outer plate 1 constituting one surface side (outer side) of the insulator, and a depression 1b serving as a base for drawing is provided in advance. Keep it. The volume M of the recess 1b
Is appropriately set to be larger than the volume m (see FIG. 1 (e)) of the hollow portion 7 provided inside the insulator after assembling.

Next, as shown in FIG. 1 (b), the depression 1b of the outer plate 1 is inserted into the lower press die 3 of the pressing device B, and a liquid 5 such as machine oil is fluidized into the depression 1b. After filling, the inner plate 2 constituting the other surface side (inside) of the insulator is aligned with the outer plate 1 and placed thereon.

Next, as shown in FIG. 1C, the entire periphery of the inner plate 2 (which becomes the flange 2a after drawing) is pressed by a wrinkle presser 6. In this case, the outer plate 1 and the inner plate 2 are slid into the lower mold 3 in accordance with the drawing process, and the inner plate 2 is pressed with a force that does not leak the liquid inside as much as possible.

Next, as shown in FIG. 4D, the upper press 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 draw forming portion 1c for one surface side of the insulator on the upper surface of the lower die 3, and the inner plate 2 is formed by the lower surface of the upper die 4 with the insulator. A draw forming part 2c for the other side is provided at the same time.
A hollow portion 7 having a volume m is formed between c. At this time, the optimal speed of the lowering speed of the upper mold 4 and the volume M of the recessed portion 1b are set by performing this step in advance. After this, FIG.
As shown in (e), after the outer plate 1 and the inner plate 2 are removed from the press mold and the liquid is discarded, the hollow portions 7 are again overlapped so as to be concave, and the flanges 1a and 2a are appropriately spaced from each other. The insulator A is assembled by spot welding p.

Next, the operation will be described.

When the flanges 1a and 2a of the outer plate 1 and the inner plate 2 are pressed from the inner plate 2 side while being pressed by the wrinkle retainer 6, the liquid 5 inside resists the resistance of the outer plate 1 against this pressing force. Since the inner plate 2 is transmitted as it is, the inner plate 2 is pressed down by the liquid 5 acting as a resistive force and closely adhered to the mold 4, and the outer plate 1 is pressed from the liquid 5 by drawing down the inner plate 2 in the lower mold 3 direction. Then, it is molded in close contact with the lower mold 3. 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 manner, the outer plate 1 and the inner plate 2 can be simultaneously formed by a set of molds. In this case, the inner plate 2 contacts the liquid 5 only on the lower surface, and the outer plate 1 contacts the liquid 5 only on the upper surface, so that the outer plate 1 does not interfere with each other.
The outer plate 2 and the outer plate 2 can be formed in different shapes. Further, since the one surface side of the narrowed portion comes into liquid contact, material flow is improved, and workability can be improved.

Since the upper die speed during drawing is related to the amount of liquid leakage, it is set so as to satisfy the following equation.

The volume M of the hollow portion of the outer plate 1 = the volume m of the hollow portion after processing + the leakage amount α of the liquid during processing.

In this embodiment, an outer plate 1 forming one surface of an insulator of a muffler of an automobile is formed with a flange 1a at a peripheral edge thereof to form a recessed portion 1b, and the volume M of the recessed portion 1b is changed to an insulator. A first step of increasing the volume m of the hollow portion 7 set in the following manner; placing the outer plate 1 in the lower press die 3 to fill the recess 1b with the liquid 5, and further forming the inner plate 2 forming the other surface side of the insulator. A second step of mounting on the upper surface of the outer plate 1; substantially preventing leakage of the liquid 5 during drawing by the press upper die 4 from above the inner plate 2 and allowing both plates 1 and 2 to slide into the lower die 3; A third step of pressing the entire outer peripheral edge of the inner plate 2 with the flange 1a of the outer plate 1 with an appropriate force; and lowering the upper die 4 to form the outer plate 1 with the lower die 3 via the liquid 5 during drawing. A fourth step of forming the inner plate 2 with the upper mold 4. Therefore, when two sheets of molding material are superimposed on each other to form a hollow portion 6 on an insulator disposed on the back of an automobile muffler, the inner and outer surfaces of the upper and lower dies 3 are simultaneously pressed. In addition, the sheet material can be drawn in accordance with the difference in the shape of the formed portion on the inner and outer surfaces.

(Other Embodiments) In the embodiment, the insulator for heat insulation of an automobile muffler has been described as an example of a hollow panel-shaped product. However, the insulator is adopted for manufacturing a safety cover, a heat insulating cover, a lid, and the like. be able to.

Further, in the embodiment, the liquid has been described as an example of the fluid, however, the same effect can be obtained in the clay state, the powder, and the like.

[0024]

According to the method for simultaneously drawing two hollow panel-shaped product materials according to the first aspect of the present invention, the outer plate forming one surface side of the hollow panel-shaped product is formed with a recessed portion except for the peripheral edge thereof. A first step of making the hollow portion larger than the hollow volume set in the hollow panel-shaped product; placing the outer plate in a press lower die to fill the hollow portion with the fluid, and further removing the other side of the hollow panel-shaped product. A second step of placing the inner plate to be formed on the upper surface of the outer plate; substantially preventing leakage of the fluid at the time of drawing with a press upper die from above the inner plate and a force capable of sliding the two plates into the die. A third step of pressing the entire outer peripheral edge of the plate; and a fourth step of lowering the upper die and forming the outer plate with the lower die and the inner plate with the upper die via the fluid at the time of drawing. Because of the method, the inner plate and the outer plate can be simultaneously molded by a set of molds. Also, the inner plate is in contact with the fluid only on the lower surface side, and the outer plate is in contact with the fluid only on the upper surface side, so that the inner plate and the outer plate can be formed as different shapes. . Further, since the one surface side of the drawn portion is in liquid contact, an excellent effect is obtained such that the material flow is improved and workability can be improved.

According to a second aspect of the present invention, there is provided a press apparatus for use in a method for simultaneously drawing two hollow panel-shaped product materials, wherein an outer plate and an inner plate forming one side and the other side of the hollow panel-shaped product are overlapped. A lower mold having a hollow portion one-side shape set for a hollow portion provided inside the two plates in a fitted state and mounting the outer plate; and a hollow portion other surface set for the hollow portion An upper die having a side shape; and an inner plate is superimposed on the outer plate in a state in which a fluid is filled in advance in a concave portion serving as a drawing base formed on the outer plate, and the entire outer peripheral edges of both plates are overlapped. And a wrinkle presser that presses against the upper surface of the lower mold in a state where they are brought into close contact with each other to prevent leakage of the fluid.
The same excellent effects as those of the first aspect can be obtained.

In the hollow insulator according to the third aspect, a hollow portion is formed on an outer plate for forming one surface side of the hollow insulator main body, leaving a peripheral portion thereof, and the hollow portion is set in the hollow insulator main body. A first step of making the volume of the hollow portion larger than the volume of the hollow portion; placing the outer plate in a lower press die to fill the recess with a fluid; and placing an inner plate forming the other surface side of the hollow insulator body on the upper surface of the outer plate. A second step of substantially preventing leakage of the fluid during drawing by a press upper die from above the inner plate and pressing the entire outer peripheral edge of the plate with a force that allows both plates to slide into the die; And 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 the drawing process; and after discarding the fluid from the depression of the outer plate. , Align the outer plate and the inner plate and fix the peripheral edges A fifth step; due to a configuration manufactured through the, and a hollow portion formed by the simultaneous drawing of an outer plate and an inner plate. This hollow portion is formed in advance by the upper die, despite the outer plate and the inner plate being drawn simultaneously.
By setting the required shape at the place where the insulator is used in the lower die, an effect that both surfaces have the optimum shape can be obtained.

In the method for manufacturing a hollow insulator according to a fourth aspect, a hollow portion is formed on an outer plate for forming one surface side of the hollow insulator body, leaving a peripheral portion thereof, and the hollow portion is set in the hollow insulator body. A first step of making the volume of the hollow portion larger than the volume of the hollow portion; placing the outer plate in a lower press die to fill the recess with a fluid; and placing an inner plate forming the other surface side of the hollow insulator body on the upper surface of the outer plate. A second step of substantially preventing leakage of the fluid during drawing by a press upper die from above the inner plate and pressing the entire outer peripheral edge of the plate with a force that allows both plates to slide into the die; When;
A fourth step of lowering the upper die and forming the outer plate with the lower die via the fluid at the time of drawing and forming the inner plate with the upper die; after discarding the fluid from the concave portion of the outer plate, And a fifth step of joining the plate and the inner plate and fixing the peripheral portions together; therefore, the outer plate and the inner plate are simultaneously provided with a drawing formed portion having substantially the same opening surface on the outer plate. The hollow insulator can be easily manufactured by discarding the above fluid, joining the outer plate and the inner plate, and fixing the peripheral portions by welding or the like. In this case, in the case where the outer plate and the inner plate are assembled again according to 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 assembled with the opening surfaces facing each other. By manufacturing an insulator with a hollow part protruding on both sides, and by changing the shape of the upper and lower molds, it is possible to manufacture insulators with different inner and outer surface shapes by performing only one drawing process And the like.

[Brief description of the drawings]

FIG. 1 is a process diagram showing a manufacturing process of an insulator for heat shielding of an automobile muffler using a pressing method of two hollow plates according to an embodiment of the present invention.

[Explanation of symbols]

 A Insulator for heat insulation of automobile B Pressing device M Volume of hollow portion provided on outer plate m Volume of hollow portion provided inside insulator 1 Outer plate 1c Drawing portion of outer plate 1a Flange provided on outer plate 1b Depressed portion provided on outer plate 2 Inner plate 2a Flange provided on inner plate 2c Draw-formed portion of inner plate 3 Lower die 4 Upper die 5 Liquid 6 Wrinkle holder 7 Hollow portion of insulator

Claims (4)

[Claims] 1. A first step in which a hollow portion is formed in an outer plate forming one surface side of a hollow panel-shaped product while leaving a peripheral portion thereof, and the hollow portion is larger than a hollow volume set in the hollow panel-shaped product. A second step of placing the outer plate in a press lower mold, filling the recess with a fluid, and placing an inner plate forming the other surface side of the hollow panel-shaped product on the upper surface of the outer plate; A third step of substantially preventing leakage of the fluid at the time of drawing with a press upper die and pressing the entire outer peripheral edge of the plate with a force that allows both plates to slide into the die; A fourth step of forming an outer plate with a lower die and forming an inner plate with an upper die via the fluid during the processing, and a method of simultaneously drawing two hollow panel-shaped product materials. 2. A hollow part one-side shape set for a hollow part provided inside two panels in a state where an outer plate and an inner plate forming one surface side and the other surface side of the hollow panel-shaped product are overlapped with each other. A lower die having the outer plate attached thereto; an upper die having a hollow side other surface shape set for the hollow portion; and a drawing formed on the outer plate in advance on the outer plate. In a state in which the fluid is filled in the concave portion serving as the base, the inner plates are overlapped, and all the outer peripheral edges of both plates are pressed against the upper surface of the lower mold in a state in which the outer peripheral edges are in close contact with each other so as to substantially prevent leakage of the fluid. A press device for use in a method for simultaneously drawing two hollow panel-shaped product materials, comprising: a wrinkle retainer; 3. A concave portion is formed on an outer plate for forming one surface side of a hollow insulator main body, leaving a peripheral portion thereof.
A first step of making the hollow portion larger than the volume of the hollow portion set in the hollow insulator main body; placing the outer plate in a lower press die to fill the hollow portion with a fluid, and further forming the other side of the hollow insulator main body. A second step of placing the inner plate on the upper surface of the outer plate; substantially preventing leakage of the fluid at the time of drawing with a press upper die from above the inner plate, and applying force that allows both plates to slide into the die; A third step of pressing the entire outer peripheral edge; a fourth step of lowering the upper die and forming the outer plate with the lower die via the fluid at the time of drawing and forming the inner plate with the upper die; A fifth step in which the fluid is discarded from the recessed portion, and the outer plate and the inner plate are joined together and the peripheral portions are fixed to each other; 4. A concave portion is formed on an outer plate for forming one surface side of a hollow insulator main body, leaving a peripheral portion thereof.
A first step of making the hollow portion larger than the volume of the hollow portion set in the hollow insulator main body; placing the outer plate in a lower press die to fill the hollow portion with a fluid, and further forming the other side of the hollow insulator main body. A second step of placing the inner plate on the upper surface of the outer plate; substantially preventing leakage of the fluid at the time of drawing with a press upper die from above the inner plate, and applying force that allows both plates to slide into the die; A third step of pressing the entire outer peripheral edge; a fourth step of lowering the upper die and forming the outer plate with the lower die via the fluid at the time of drawing and forming the inner plate with the upper die; A fifth step of, after discarding the fluid from the depression, joining the outer plate and the inner plate and fixing the peripheral portions to each other;