JP2002102949A - Forming method of car body panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the production efficiency and further, improve the forming accuracy by pressing a blank material by a locally intruding die, thereby enabling the blank to be quickly pressed. SOLUTION: The forming method of a car body panel comprises a procedure of closing a movable die 17 and a fixing die 18 mutually to hold the peripheral edge 13 of a bank material 11 and making a fluid 36 into a space of the fixed mold 17 in the heated state of the blank material 11 in a specified temperature to closely stick the blank material 11 to the fixed die 18 and pressurizing a locally intruding die 21 to non-closely stock sections 41, 42, 43 from the forming condition to couple with the die to effectuate bending forming.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a body panel using a metal plate.

[0002]

2. Description of the Related Art A body panel is formed by molding a plate material into a desired shape.
No. 8378, entitled "Apparatus for Forming Thin Plate Material and Method for Release of Thin Plate Formed Body". According to paragraphs [0019] to [0021] of the publication, a method of releasing this thin sheet molded product is as follows. However, the following is a summary of the original text.

First, a thin plate 2 made of an aluminum alloy is disposed between a mold container 4 (the reference numeral used in the publication is the same as that in the publication; hereinafter the same) and a top plate 6 in FIG. The peripheral edge 2 a of the thin plate material 2 is held between the mold container 4 and the top plate 6. Then, the sheet material 2 is heated to about 500 ° C., a gas is supplied between the sheet material 2 and the top plate 6, and the sheet material 2 is pressed against the mold container 4 to perform a forming process. Thereafter, the thin plate member 2 is released from the mold container 4 while holding the peripheral portion 2 a between the top plate 6 and the head 10. As described above, according to the conventional technique, since the mold is released while sandwiching the peripheral portion 2a of the thin plate material 2, it is not necessary to use a fork for releasing, and the workability can be improved. . Therefore, one cycle of molding is shortened. Such a molding cycle will be briefly described with reference to the following drawings.

FIGS. 14A and 14B are views showing an example of a conventional molding cycle. (A) shows a molding state, in which a blank material 103 is pressed against a mold 102 of a fixed mold 101 with a fluid 104 to perform molding. Then, the mold is released and the molded product is taken out. (B) shows the molding cycle of the molding of (a), in which the horizontal axis represents time M and the vertical axis represents fluid pressure P. In this case, the maximum pressure for pressing the blank material is P3, and the release is performed between time M8 and time M9.
The molding is completed at time M9. The time required for these moldings is M9, and one cycle of molding is time M9. That is, the release of the above publication is performed in the time period M8 to the time period M9 in FIG.
In the technology disclosed in the publication, the time from time M8 to time M9 can be shortened, and the cycle time can be shortened.

[0005]

However, according to the technique disclosed in the above publication, a gas is supplied to press the thin plate member 2 against the mold container 4 to perform a forming process. The thin plate member 2 is formed only by the gas pressure. It is difficult to bend sharply and precisely to the corners.
In order to transfer the mold of the mold container 4 accurately, a high pressure and a long time,
It is necessary to press, and the production efficiency decreases. As an example, when the gas pressure is set to the pressure P3 in FIG.
The blank 103 shown in FIG. 14A does not easily adhere to the sharp and deep concave portions 105, 106, and 107 of the mold 102, and the time required for the bending process becomes M8. In other words, according to the technique disclosed in the publication, the time required for bending the thin plate material 2 becomes longer, so that the production efficiency decreases.

Accordingly, an object of the present invention is to provide a method of manufacturing a vehicle body panel capable of improving production efficiency and improving molding accuracy.

[0007]

In order to achieve the above-mentioned object, a first aspect of the present invention is to provide one mold and the other mold when the mold is opened on a dividing surface, and a local press-in mold provided on one mold. When,
A blank material for a vehicle body panel is prepared, one mold and the other mold are closed, a peripheral portion of the blank material is gripped, and one of the molds is heated in a state where the blank material is heated to a predetermined temperature. The fluid is poured into the space, and the blank is brought into close contact with the other mold to perform the molding. From this molding state, the local press-in die is pressed to the non-adhered part, and it is fitted to the other mold and bent to form a close contact Is carried out.

[0008] First, a fluid is poured into the space of one mold, and the blank material is closely adhered to the other mold to perform molding.
Subsequently, molding is performed by a local press-in die. In the molding by the local press die, the time required for the molding is extremely short because the blank is closely adhered to the other mold by the local press die. As a result, the cycle time of one cycle is shortened. In addition, since the blank is brought into close contact with the other mold by the local press-in die, plastic deformation can be performed even in a portion where plastic deformation with a fluid is difficult, and molding can be performed with high precision.

According to a second aspect of the present invention, in each of the molding steps, the blank is brought into close contact with a convex mold formed on the other mold. Since the blank material is brought into close contact with the convex mold formed on the other mold, the surface pressed with the fluid should be placed on the front surface of the body panel, and the surface that comes into close contact with the mold should be placed on the back surface of the body panel. Can be. That is, scars and indentations hardly occur on the side pressed with the fluid, and no labor is required.

A third aspect of the present invention is characterized in that in each molding, a blank material is brought into close contact with a concave mold formed in the other mold. Since the blank material is brought into close contact with the concave mold formed in the other mold, the area in which the blank material is in close contact can be used as a vehicle body panel, and the amount of waste of blank material other than the peripheral portion is reduced.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a flowchart (first embodiment) of a method of forming a vehicle body panel according to the present invention, in which ST indicates steps. ST01: One mold, the other mold, a local press-in mold provided in one mold, and a blank material are prepared. ST02: One mold and the other mold are closed, and the periphery of the blank material is gripped.

ST03: While the blank is being heated, a fluid is poured into one of the molds, and the blank is brought into close contact with the other mold to perform molding. ST04: From this molding state, a local press-in die is pressed against the non-adhered portion, and is fitted to the other mold, and is brought into close contact with it to perform bending molding. ST05: After release, the molded body panel is taken out. Next, ST01 to ST05 will be specifically described.

FIG. 2 is a first explanatory view (first embodiment) of a method of forming a vehicle body panel according to the present invention. First, the blank material 11 is formed. More specifically, blank materials 11... (... Indicate a plurality) are blanked out from the aluminum alloy material 12. At that time, the blank material 11
A peripheral portion 13 is provided. Aluminum alloy material 12
For example, it is an Al-Mg-Si alloy (6000 series) or an Al-Mg alloy (5000 series) plate material.

FIG. 3 is a second explanatory view (first embodiment) of the method of forming a vehicle body panel according to the present invention. The blank material 11 is set in a mold 16 attached to a press machine 15. Specifically, the mold 16 includes a movable mold 17 that is one mold and a fixed mold 18 that is the other mold.

The movable mold 17 includes a local press-in mold 21 formed in the center, a filling chamber 22, a flow path 23 for guiding a fluid to the filling chamber 22, a pipe 24 connected to the flow path 23, and a surrounding area. And a divided surface 25 provided. Tube 24
Is free to bend following the movement of the movable mold 17,
The length of the movable part is set according to the moving distance of the movable mold 17.

The fixed mold 18 includes a convex mold 27 formed at the center and a blank holder 28 provided around the mold 27.
The mold 27 is provided with narrow and relatively deep concave portions 31, 32 and 33. 34 is a return spring.

As shown in the figure, the movable mold 17 is kept at the upper limit, and the blank material 11 is placed between the movable mold 17 and the fixed mold 18 in the mold open state.
Carry in and set. Thereafter, the movable mold 17 is lowered as shown by the arrow.

FIGS. 4A and 4B are third explanatory views (first embodiment) of the method for forming a vehicle body panel according to the present invention. (A): The mold is closed by the lowered movable mold 17, and the peripheral part 13 of the blank material 11 is gripped by the movable mold 17 and the blank holder 28. Then, the blank material 11 is heated to a predetermined temperature by a heating means (not shown).

In this heating, the predetermined temperature of the blank material 11 was set in a range of 475 to 500 ° C. If the temperature is lower than 475 ° C., the temperature of the aluminum alloy used for the blank material is too low, and the resistance to plastic deformation is large. On the other hand, when the predetermined temperature exceeds 500 ° C., depending on the degree of bending, surface roughness becomes more conspicuous. 475-500 at desired heating rate
After the temperature is raised to 0.degree.
Pressure down.

(B): While moving down the movable mold 17, the blank holder 28 is lowered against the return spring 34, and the blank material 11 is pressed against the convex mold 27 of the fixed mold 18.

FIG. 5 is a fourth explanatory view (first embodiment) of the method for forming a vehicle body panel according to the present invention. After pressing the blank material 11 against the mold 27, the fluid 3 having a pressure P 3 is filled in a space 35 formed by the filling chamber 22 of the movable mold 17 and the blank material 11.
Pour 6 in. Then, wrinkles are extended, and the blank material 11 is pressed against the convex mold 27, and the molding is performed by closely adhering to the mold 27.

In the forming step shown in FIG. 5, since the blank material 11 is plastically deformed by the fluid 36 at the pressure P3 and the forming is performed, it is not necessary to process the movable mold 17 with a mold for pressing the entire surface of the blank material 11. In addition, the manufacturing cost of the mold can be reduced.

In this molding, since the pressure P3 acts evenly on the entire surface of the blank material 11, the blank material 11 bends and plastically deforms, and almost the entire surface comes into close contact with the mold 27. Conversely, in the portion of the mold 27 facing the concave portions 31, 32, and 33, the stress of the blank material 11 overcomes, and the blank material 11 cannot be largely bent, and the non-adhered portion 41 that does not adhere to the concave portions 31, 32, and 33 , 42 and 43 occur.

FIG. 6 is a fifth explanatory view (first embodiment) of the method for forming a vehicle body panel according to the present invention. Continuing from the state of being molded with the fluid 36, the movable mold 17 is further depressed. Specifically, the non-adhered portions 41, 4 remaining on the blank material 11
2, 43 are pressed against the local pressing die 21 of the movable die 17, and the local pressing die 21 is
1, 32, 33 and the concave portions 31, 32, 3
The blank material 11 is brought into close contact with 3 and bent to form a vehicle body panel 44.

As described above, in the forming step shown in FIG. 6, the local press die 21 of the movable die 17 is pressurized, and the local press die 21 and the convex die 27 of the fixed die 18 are used to form the blank 1.
Since the non-contact portions 41, 42, 43 remaining in 1 are bent, the time for forming the non-contact portions 41, 42, 43 is extremely short.

The local press-in mold 21 and the convex mold 27
And the non-adhered portions 41, 42, 4 remaining on the blank material 11
Since the mold 3 is formed, the blank 11 can be securely brought into close contact with the mold 27, can be plastically deformed, and the molding accuracy can be improved.

Further, in the forming step shown in FIG.
In step 6, the blank 11 is brought into close contact with the convex mold 27 of the fixed mold 18 and the fluid 36 presses the side of the vehicle body panel which is to be the front side. Flaws and dents are scarcely generated, and productivity can be improved.

FIG. 7 is a sixth explanatory view (first embodiment) of the method of forming a vehicle body panel according to the present invention. Finally, the vehicle body panel 44 is taken out. Specifically, after the fluid is discharged, the movable mold 17 is raised, the mold is opened, the vehicle body panel 44 is protruded by the blank holder 28 of the fixed mold 18 as indicated by an arrow, and the mold is released. Then, the vehicle body panel 44 is taken out, and one cycle of molding is completed. Subsequently, returning to FIG. 3, the second cycle is performed.

FIG. 8 is a comparison diagram of the molding cycle, in which the horizontal axis represents time M and the vertical axis represents fluid pressure P.
In addition, time M1 is set completion, time M2 is completion of temperature rise, time M3 is time to reach pressure P1, time M4 is time to reach pressure P2, time M5 is pressurization start time of the mold, and time M6 is fluid and mold dependent. Indicates the completion of pressurization.

The broken line in the figure is a comparative example, and FIG.
Shows a conventional molding cycle, and the time required for one cycle is M9. The solid line is an example,
FIG. 3 shows a molding cycle of a method for molding a body panel of the present invention,
The bending is completed in time M6, and the time required for one cycle is M7. As is clear from the figure, the time M7 is equal to the time M
9, and the molding cycle time is short. Therefore, according to the method of the present invention, the cycle time can be shortened, and the production efficiency can be improved.

Next, another embodiment of the method for forming a vehicle body panel according to the present invention will be described. FIGS. 9A and 9B are first explanatory views (second example) of another embodiment, and the same reference numerals are given to the same configurations as those in the embodiments shown in FIGS. Description is omitted.

(A): The blank material 11 is set in a mold 50 attached to a press machine 15. Specifically, the mold 50
Consists of a fixed mold 51, which is one mold, and a movable mold 52, which is the other mold.

The fixed mold 51 includes a local press-in mold 53 formed in the center, a filling chamber 54, a flow path 55 for guiding a fluid to the filling chamber 54, a pipe 56 connected to the flow path 55, and a surrounding area. And a blank holder 28 provided. The pipe 56 is fixed to the press 15 with a pipe clamp 56a.

The movable mold 52 includes a concave mold 57 formed at the center, a divided surface 25 provided at the periphery, and a protruding mechanism 58.
The mold 57 is provided with narrow and relatively deep concave portions 61, 62 and 63. The blank material 11 is carried into such a mold 50 and set.

(B): movable mold 52 and blank holder 2
8, the peripheral portion 13 of the blank material 11 is gripped, and the blank material 11 is heated to a predetermined temperature by a heating means (not shown).

FIG. 10 is a second explanatory view (second embodiment) of another embodiment. The movable mold 52 is lowered, and the blank holder 28 is lowered against the return spring 34 to start flowing the fluid.

FIG. 11 is a third explanatory view (second embodiment) of another embodiment. The fluid 36 is poured into the space 35 formed by the filling chamber 54 and the blank material 11, the blank material 11 is pressed against the concave mold 57, and the molding is performed by closely contacting the mold 57.
During this molding, the pressure P3 acts uniformly on the entire surface of the blank material 11, so that the blank material 11 bends and plastically deforms, and almost the entire surface comes into close contact with the mold 57. vice versa,
The stress of the blank 11 overcomes the recesses 61, 62, 63 of the mold 57, so that the blank 11 cannot be largely bent, and the non-contact portions 64, 65, 65, 65, which do not adhere to the recesses 61, 62, 63. 66 occurs.

FIG. 12 is a fourth explanatory view (second embodiment) of another embodiment. Continuing from the state of molding with the fluid 36, the movable mold 52 is further reduced. Specifically, blank material 1
The fixed mold 51 is attached to the non-adhered portions 64, 65 and 66 remaining in
Of the local press mold 53, and pressurize the local press mold 5
3 is fitted to the concave portions 61, 62, 63 of the movable mold 52, and the blank material 11 is brought into close contact with the concave portions 61, 62, 63 and bent to form the vehicle body panel 67.

Thus, in the forming step shown in FIG. 12, the same effects as those of the embodiment shown in FIGS. 2 to 8 can be obtained. That is, the local press-in mold 53 of the fixed mold 51
Since the non-contact portions 64, 65, and 66 remaining on the blank material 11 are formed by using the concave mold 57 of the movable mold 52, the time for forming the non-contact portions 64, 65, and 66 is extremely short.
Therefore, the cycle time can be shortened, and the production efficiency can be improved. Further, the molding accuracy can be improved.

Further, in the molding step shown in FIG. 12, since the range in which the fluid 36 is brought into close contact with the concave mold 57 of the movable mold 52 can be used as a product for the body panel, it is not used as the body panel. The place to be cut from the blank material 11 and disposed is only the gripped peripheral portion 13, and the amount of waste can be reduced. Therefore, the production cost can be reduced.

In the molding of the second embodiment shown in the figure, a flow path 55 is formed in a fixed mold 51, a pipe 56 is fixed to a press machine 15 by a pipe clamp 56a, and a fluid flows through the fixed mold 51. There is no need to provide a means for moving the tube 56, and the die cost can be reduced.

FIGS. 13A and 13B are fifth explanatory views (second embodiment) of another embodiment. (A): After discharging the fluid, the movable mold 52 is raised to open the mold. (B): Finally, the protruding mechanism 58 of the movable mold 52 is protruded as indicated by an arrow, and the vehicle body panel 67 is released and released. Then, the vehicle body panel 67 is taken out, and one cycle of molding is completed. Subsequently, returning to FIG. 9, the second cycle is performed.

The molds 16 and 50 shown in FIGS. 3 and 9 according to the embodiment of the present invention are merely examples, and the present invention is not limited to these, and the configuration and the shape of the mold are arbitrary. For example, a mold in which a plurality of molding steps are integrated into one step may be used.
In the embodiment, the mold is formed after the fluid. However, depending on the shape of the vehicle body panel and the shape of the mold, it is also possible to form the mold by using a local press-in mold and then to form the body by flowing the fluid.

In some cases, the start of pressurization and the start of inflow of fluid in the local press-in type can be performed simultaneously. The convex mold of the mold can be formed in the movable mold, and the concave mold can be formed in the fixed mold. The release method, the position and the number of flow paths are arbitrary.
Further, the present invention is not limited to the fluid, but may be a gas.

[0045]

According to the present invention, the following effects are exhibited by the above configuration. In claim 1, one mold and the other mold are closed with each other to grip a peripheral portion of the blank material, and while the blank material is heated to a predetermined temperature, a fluid is poured into the space of one mold, The blank material is pressed into contact with the other mold to perform molding.From this molding state, the local press-in die is pressed to the non-contact area, and is fitted to the other mold. Can be formed in a short time, and the cycle time can be shortened. Therefore, it is possible to improve the production efficiency.

In addition, since the local press-in mold provided on one mold is pressed against the other mold and the blank material is brought into close contact with the other mold to perform the bending, a portion which is difficult to mold with a fluid is used. Can be accurately molded. Therefore, the molding accuracy can be improved.

In the second aspect, the blank material is brought into close contact with the convex mold formed on the other mold, so that the surface pressed with the fluid is arranged on the front surface of the vehicle body panel, and the surface that comes into close contact with the mold is placed on the vehicle body panel. Can be placed on the back side of the That is,
Few scratches and dents are generated on the side pressed with the fluid. Therefore, productivity can be improved.

According to the third aspect of the present invention, since the blank material is brought into close contact with the concave mold formed in the other mold, the area in which the blank material adheres can be used as a vehicle body panel, and the amount of waste discharged from the blank material other than at the peripheral edge portion can be used. Can be reduced. Therefore, the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart of a method for forming a vehicle body panel according to the present invention (first embodiment).

FIG. 2 is a first explanatory view of a method of forming a vehicle body panel according to the present invention (first embodiment);

FIG. 3 is a second explanatory view of the vehicle body panel forming method according to the present invention (first embodiment).

FIG. 4 is a third explanatory view of the method of forming a vehicle body panel according to the present invention (first embodiment).

FIG. 5 is a fourth explanatory view of the vehicle body panel forming method according to the present invention (first embodiment).

FIG. 6 is a fifth explanatory view of the method of forming a vehicle body panel according to the present invention (first embodiment).

FIG. 7 is a sixth explanatory view of the method of forming a vehicle body panel according to the present invention (first embodiment).

FIG. 8 is a comparison diagram of a molding cycle.

FIG. 9 is a first explanatory view of another embodiment (second embodiment);

FIG. 10 is a second explanatory view of another embodiment (second embodiment).

FIG. 11 is a third explanatory view of another embodiment (second embodiment);

FIG. 12 is a fourth explanatory view of another embodiment (second embodiment);

FIG. 13 is a fifth explanatory view of another embodiment (second embodiment).

FIG. 14 shows an example of a conventional molding cycle.

[Explanation of symbols]

11 ... blank material, 13 ... peripheral part, 17 ... one mold (movable mold), 18 ... other mold (fixed mold), 21
53: Local press-in mold, 25: Dividing surface, 27: Convex mold, 35: Space, 41, 42, 43, 64, 65, 66
... Non-adhered parts, 44, 67 ... Body panel, 51 ... One mold (fixed mold), 52 ... The other mold (movable mold), 5
7 ... concave mold.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Okunaka 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. F term (reference) 4E050 AA11

Claims (3)

[Claims] A first mold and a second mold when the mold is opened on a dividing surface; a local press-in mold provided in the one mold;
A blank material for a vehicle body panel is prepared, the one mold and the other mold are closed with each other, a peripheral portion of the blank material is gripped, and one of the molds is heated in a state where the blank material is heated to a predetermined temperature. A fluid is poured into the space of the mold, and the blank is brought into close contact with the other mold to perform molding. From this molding state, a local press-in mold is pressed to a non-adhered portion, and is fitted to the other mold and bent while being closely attached. A method of forming a vehicle body panel, which comprises forming. 2. The method according to claim 1, wherein in each of the molding steps, a blank material is brought into close contact with a convex mold formed in the other mold. 3. The method according to claim 1, wherein in each of the molding steps, a blank material is brought into close contact with a concave mold formed in the other mold.