JP4668454B2 - Forming method for body panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a vehicle body panel using blanks having different thicknesses.
[0002]
[Prior art]
As a method of manufacturing plate materials having different plate thicknesses, for example, there is a method disclosed in Japanese Patent Application Laid-Open No. 59-232611 “Method for correcting plate thickness change point tracking”. According to the third page of the upper left column, line 15 to the lower left column, line 16 of the publication, the method for correcting the thickness change point tracking is as follows. However, the following explanation is a summary of the original text.
Rolling machine 1 (the sign is the same as that described in the official gazette, the same applies hereinafter) is forward-pass rolled by forward rotation and reverse-pass rolling by reverse rotation. 2 figure). At that time, it is detected that the change point of the roll interval has arrived just below the rolling mill 3, and the adjustment is performed to track the start point of the plate thickness change.
[0003]
[Problems to be solved by the invention]
However, in the method of the above publication, since the forward pass rolling and the reverse pass rolling are performed, the length of the rolled material 1 in the rolling direction tends to vary. If the position of the stepped portion moves to the left or right as the length varies, it is difficult to match the stepped portion of the rolled material 1 to the predetermined position of the mold during press forming in the subsequent process, and the dimensional accuracy of the vehicle body panel decreases. To do.
[0004]
Therefore, an object of the present invention is to provide a method for forming a vehicle body panel that can improve the dimensional accuracy of the vehicle body panel.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, in order from one end of the flat plate to the other end, the first plate thickness portion and the second plate thickness portion whose thickness is thinner than the first plate thickness portion are obtained by a rolling mill. A method for forming a vehicle body panel comprising forming a plate, leaving the rest as a third plate thicker portion thicker than the first plate thick portion, and forming the plate into a predetermined shape with a press using a flat plate as a blank material. Rolling the first plate thickness portion and the second plate thickness portion to a plate thickness intermediate between the plate thickness of the first plate thickness portion and the plate thickness of the third plate thickness portion, while feeding The second rolling step of rolling to a plate thickness of the second plate thickness part while feeding the flat plate to the other, and the rolling roll interval at the boundary between the first plate thickness portion and the second plate thickness portion for the plate thickness of the first plate thickness portion And a third rolling step of rolling to a plate thickness of the first plate thickness portion while feeding a flat plate to the other under these conditions, and the obtained blank material with a press machine A first rolling step, with the end of the third plate thickness portion as a reference portion and a boundary between the second plate thickness portion and the third plate thickness portion at a desired distance from the reference portion. In the second rolling process, the distance from the reference part is longer than the desired distance of the third plate thickness part, and the final step part of the third plate thickness part is formed from one end to the end step part. The terminal step portion of the second plate thickness portion, which is the boundary between the first plate thickness portion and the second plate thickness portion, is formed by feeding from the terminal step portion of the third plate thickness portion toward one end. By placing the reference part on the positioning part of the press die attached to the machine and placing it on the press die, the end step part of the third plate thickness part and the second plate thickness part are placed at predetermined positions on the die surface of the press die. Molding is performed after the end stepped portions are matched.
[0006]
In the first rolling step, while feeding the flat plate to one side, the portion rolled to an intermediate plate thickness is given to one side of the rolling device, so when using the flat plate left on the other side of the rolling device as the third plate thickness portion, The length from the reference portion at the other end of the flat plate to the end of the third plate thickness portion can be determined regardless of the extension in the rolling direction, and the accuracy of the length of the third plate thickness portion is improved.
[0007]
In the second rolling step, the roll is reversely rotated at the completion position of the first rolling step, and the plate is fed to the other side, while only the range of the second thickness portion is placed on the other side of the rolling device. The length from the reference portion to the end of the second plate thickness portion is determined. Therefore, it is easy to ensure the length of the second plate thickness portion accurately.
[0008]
Since the blank material formed in the first to third rolling steps is used in the forming step, the dimensional accuracy of the vehicle body panel is improved. That is, when the blank material is set on the die of the press machine, if the positioning is performed using the reference portion, the first plate thickness portion, the second plate thickness portion, and the third plate thickness portion are made to coincide with a predetermined position of the die. The dimensional accuracy of the vehicle body panel after plastic working is improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a front view of a blank material manufactured by a method for forming a vehicle body panel according to the present invention. A blank material 10 includes a first plate thickness portion 11, a second plate thickness portion 12, The third plate thickness portion 13 is formed, and three different plate thicknesses are provided on one flat plate 14. Reference numeral 15 denotes a reference portion provided at the end of the other 10 b of the blank member 10, and a reference portion of the flat plate 14, t 1 is a plate thickness of the first plate thickness portion 11, and t 2 is a plate of the second plate thickness portion 12. The thickness, t3, is the plate thickness of the third plate thickness portion 13.
[0010]
Here, as an example of the plate thickness, for example, the plate thickness t1 of the first plate thickness portion 11 is 1.2 mm, the plate thickness t2 of the second plate thickness portion 12 is 0.9 mm, and the third plate thickness portion The plate thickness t3 of 13 is set to 2.3 mm.
[0011]
FIG. 2 is a flowchart of a method for forming a vehicle body panel according to the present invention, and ST indicates a step.
ST01: While feeding the flat plate to one side, it is rolled to a plate thickness intermediate between the plate thickness of the first plate thickness portion and the plate thickness of the third plate thickness portion.
ST02: Rolling to the thickness of the second thickness portion while feeding the flat plate to the other side.
ST03: The rolling roll interval is set for the plate thickness of the first plate thickness portion at the boundary between the first plate thickness portion and the second plate thickness portion, and the plate thickness of the first plate thickness portion is sent to the other side under this condition. To roll.
ST04: The obtained blank is formed into a predetermined shape with a press.
Next, ST01 to ST04 will be specifically described.
[0012]
FIGS. 3A to 3D are first explanatory views of a method for forming a vehicle body panel according to the present invention, and are schematic diagrams of rolling.
(A): First, the flat plate 14 is set in the rolling device 21. Specifically, the rolling device 21 includes an upper work roll 22, a lower work roll 23, feed rolls 24 and 25 provided on one side 21a of the rolling device 21, and guide rolls 26 and 27 provided on the other side 21b. And a slidable clamp means 31 and a control panel and operation panel not shown in the figure. In this operation panel, a desired rolling condition, for example, a roll gap which is a rolling roll interval is set to G1, and the rotation speeds of the upper and lower work rolls 22 and 23 are set to N.
[0013]
Next, the flat plate 14 is placed on the other side 21 b of the rolling device 21 as indicated by a two-dot chain line, one end 32 of the flat plate 14 is passed through the clamping means 31, and one end 32 is placed on the guide roll 27. Then, with the predetermined button of the operation panel set to “ON” and the other end 33 being gripped by the clamping means 31, the flat plate 14 is sent to the upper and lower work rolls 22, 23 at a predetermined speed V as indicated by the arrow (1). At the same time, the one end 32 is sandwiched between the guide rolls 26 and 27 to guide the flat plate 14. Although the guide rolls 26 and 27 are driven without being driven, the configuration of the guide rolls 26 and 27 is arbitrary.
[0014]
(B): Subsequently, the first rolling step is started, and the first plate thickness portion 11 and the second plate thickness portion 12 are rolled while feeding the flat plate 14 in one direction (the direction of arrow (1)). More specifically, the upper and lower work rolls 22 and 23 are engaged with the one end 32 of the flat plate 14 and rolled, and the one end 32 coming out on one side 21a of the rolling device 21 is passed through the feed rolls 24 and 25 to be supported. However, the feed continues to form an intermediate plate thickness t4 between the plate thickness t1 of the first plate thickness portion 11 (see FIG. 1) and the plate thickness t3 of the third plate thickness portion 13, and the upper and lower work rolls 22, When the end point 34 of the length L1 reaches between the 23 rotation axes, the feeding is temporarily stopped. That is, the rotation of the upper and lower work rolls 22 and 23 and the feeding of the clamping means 31 are stopped.
[0015]
Here, as an example of the plate thickness t4, for example, the plate thickness t1 of the first plate thickness portion 11 (see FIG. 1) is 1.2 mm, and the plate thickness t3 of the third plate thickness portion 13 is 2.3 mm. In this case, the plate thickness t4 as the intermediate plate thickness between the plate thickness t1 of the first plate thickness portion 11 and the plate thickness t3 of the third plate thickness portion 13 may be about 1.8 mm.
[0016]
The means for detecting the length L1 is arbitrary. For example, the reference unit 15 may be detected directly or non-contacted by a sensor not shown in the drawing, the clamp means 31 may be directly detected, and the feed amount of the clamp means 31 may be measured by the sensor. These may be combined.
[0017]
(C): Subsequently, the terminal step 13a of the third plate thickness portion 13 is formed. Specifically, the upper work roll 22 is squeezed down as indicated by arrow {circle around (2)} at the position of the end point 34 of the length L1, and the roll gap is changed to G2, whereby the end step portion 13a of the third plate thickness portion 13 is changed. Formation is complete.
[0018]
Thus, in the first rolling step, the first plate thickness portion 11 and the second plate thickness portion 12 are changed to the plate thickness t1 of the first plate thickness portion 11 while feeding the flat plate 14 in one direction (in the direction of arrow (1)). In addition, since rolling is performed to an intermediate plate thickness t4 with the plate thickness t3 of the third plate thickness portion 13, if the flat plate 14 left on the other side 21b of the rolling device 21 is used as the third plate thickness portion 13, the one side 21a The position of the terminal step portion 13a of the third plate thickness portion 13 with respect to the reference portion 15 can be detected regardless of the extension of the plate thickness t4 that has come out, and the terminal step portion 13a of the third plate thickness portion 13 can be detected. While being able to determine a position correctly, the length L1 of the 3rd board thickness part 13 can be ensured correctly.
[0019]
(D): Subsequently, the second rolling step is started, and the plate 14 is rolled to the plate thickness t2 of the second plate thickness portion 12 while being fed to the other side 21b. Specifically, the upper and lower work rolls 22 and 23 are rotated reversely (in the directions of arrows (3) and (3)) in the state of the roll gap G2 to form a plate thickness t2, and the second plate thickness portion 12 is While forming, the clamping means 31 pulls the other end 33 of the flat plate 14 as indicated by the arrow (4) and continues rolling.
[0020]
4 (a) to 4 (d) are second explanatory views of a method for forming a vehicle body panel according to the present invention, and are schematic diagrams of rolling.
(A): The second plate thickness portion 12 is completed. The second plate thickness portion 12 is fed out to the other side 21b, and the feeding is temporarily stopped when the end point 35 of the length L2 reaches between the rotation axes of the upper and lower work rolls 22 and 23. That is, the plate thickness is reduced from the plate thickness t4 to the plate thickness t2, and the second plate thickness portion 12 is completed at the position of the length L2.
[0021]
In this way, in the second rolling mill, the flat plate 14 is rolled to the thickness t2 of the second plate thickness portion 12 while feeding the other plate (in the direction of arrow (4)), so the second plate thickness portion 12 is provided on the other side 21b. While taking out, it is possible to detect the position of the terminal step portion 12a of the second plate thickness portion 12 with respect to the reference portion 15, and to accurately determine the position of the terminal step portion 12a of the second plate thickness portion 12, The length L2 of the second plate thickness portion 12 can be accurately ensured.
[0022]
In the second rolling step, the plate thickness t4 is further reduced to the plate thickness t2 using the plate thickness t4 formed in the first rolling step, so that the reduction ratio is higher than the plate thickness t3 of the third plate thickness portion 13. Can be achieved. As a result, a high rolling reduction can be achieved with a relatively small rolling load, and the rolling apparatus can be downsized.
[0023]
(B): Next, the third rolling step is started and the roll gap is changed. That is, the roll gap is set for the plate thickness t1 (see FIG. 1) of the first plate thickness portion 11 at the terminal step portion 12a as the boundary between the first plate thickness portion 11 and the second plate thickness portion 12 in the stopped state. To do. Here, the upper work roll 22 was raised as shown by arrow (5), and the roll gap was set to G3.
[0024]
(C): Subsequently, the first plate thickness portion 11 is formed. Specifically, the flat plate 14 is rolled to the thickness t1 of the first thickness portion 11 while feeding the flat plate 14 to the other side (in the direction of arrow (4)) under the condition of the roll gap G3. That is, the plate thickness is reduced from the plate thickness t4 to the plate thickness t1.
[0025]
(D): Subsequently, when the flat plate 14 is sent to the other side 21b and the first plate thickness portion 11 is completely sent out from the upper and lower work rolls 22 and 23 of the roll gap G3, the first plate thickness portion 11 is completed. The material 10 is completed. Then, the completed blank 10 is taken out from the rolling device 21 and conveyed to the next forming step.
[0026]
FIG. 5 is a third explanatory view of a method for forming a vehicle body panel according to the present invention, wherein a terminal step portion 13a of the third plate thickness portion 13 is formed with a length L1 from the reference portion 15 of the blank 10 and the reference portion 15 is formed. It shows that the terminal step part 12a of the second plate thickness part 12 is formed with the length L2, and when the blank material 10 is formed in the next forming process, the reference part 15 is indicated by a two-dot chain line. This indicates that the blank 10 is set by being applied to the positioning portions 36 and 36 as shown by arrows (6) and (6).
[0027]
FIG. 6 is a fourth explanatory view of the vehicle body panel molding method according to the present invention, and is a schematic diagram showing an example of press molding.
Next, a forming process is started, and the blank material 10 is formed into a predetermined shape by the press machine 41. Specifically, the reference portion 15 of the blank 10 is moved to the positioning portion 36 of the press die 42 (upper die 42a, lower die 42b, die surfaces 42c, 42c) attached to the press machine 41 by the arrow (6). Put it on the lower mold 42b. Thereafter, the upper mold 42a is lowered to form the blank material 10 into a predetermined shape, and a predetermined vehicle body panel 43 is obtained. Alternatively, press molding is continued to obtain a predetermined vehicle body panel.
[0028]
Thus, in the molding process for molding the blank material 10, when the reference portion 15 is applied to the positioning portion 36 of the press die 42, the third plate thickness portion 13 is placed at a predetermined position on the mold surfaces 42 c and 42 c of the press die 42. The end step portion 13a and the end step portion 12a of the second plate thickness portion 12 can be accurately matched, and the dimensional accuracy of the vehicle body panel can be improved.
That is, the lengths L1 and L2 from the reference portion 15 are accurately ensured in the first to third rolling steps of the previous step, and at the same time, the position of the terminal step portion 13a and the position of the terminal step portion 12a with respect to the reference portion 15 are accurately determined. Since it is determined, it is possible to improve the dimensional accuracy of the body panel after plastic working.
[0029]
In the blank 10 of FIG. 1 shown in the embodiment of the present invention, the plate thicknesses are three types of t1, t2, and t3, but are not limited to three types.
Each structure of the rolling device 21, the press 41, and the press die 42 used in the method for forming the vehicle body panel is an example.
[0030]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to a first aspect of the present invention, there is provided a method for forming a vehicle body panel, wherein the first plate thickness portion and the second plate thickness portion are set to the plate thickness of the first plate thickness portion and the plate thickness of the third plate thickness portion while feeding the flat plate to one side. At the boundary between the first rolling step for rolling to an intermediate plate thickness, the second rolling step for rolling to a plate thickness of the second plate thickness portion while feeding a flat plate to the other, and the boundary between the first plate thickness portion and the second plate thickness portion The rolling roll interval is set for the plate thickness of the first plate thickness portion, and the blank material obtained is pressed in the third rolling step for rolling to the plate thickness of the first plate thickness portion while feeding the flat plate to the other under this condition. And forming a predetermined shape with a machine. In the first rolling process, the end of the third plate thickness portion is used as a reference portion, and the second plate thickness portion and the third plate are placed at a desired distance from the reference portion. the termination step of the third thickness portion bounding the thick portion molding sent from one end to the end step portion, the second rolling process, the distance from the reference portion is the third plate The first thickness portion and the end step portion of the second thickness portion at the boundary of the second thickness portion to the long desired distance from the desired distance parts, toward one end from the end step portion of the third thickness portion In the molding process, the third plate thickness portion is placed at a predetermined position on the die surface of the press die by placing the reference portion on the positioning portion of the press die attached to the press machine and placing it on the press die. After the end stepped portion of the second plate and the end stepped portion of the second plate thickness portion are matched, molding is performed.
In the first rolling step, while feeding the flat plate to one side, the portion rolled to an intermediate plate thickness is given to one side of the rolling device, so when using the flat plate left on the other side of the rolling device as the third plate thickness portion, The length from the reference portion at the other end of the flat plate to the end of the third plate thickness portion can be determined regardless of the extension in the rolling direction. Therefore, the length of the third plate thickness portion can be ensured accurately, and the position of the terminal step portion of the third plate thickness portion can be accurately determined.
[0031]
In the second rolling step, the roll is reversely rotated at the completion position of the first rolling step, and the second plate thickness is transferred to the other side of the rolling device while feeding the flat plate from the terminal step portion of the third plate thickness portion toward one end . Only the range of the portion is rolled out to the plate thickness of the second plate thickness portion, and the length from the reference portion to the end of the second plate thickness portion is determined. Accordingly, the length of the second plate thickness portion can be ensured accurately, and the position of the terminal step portion of the second plate thickness portion can be accurately determined.
[0032]
Further, in the second rolling step, the intermediate plate thickness formed in the first rolling step is rolled to a plate thickness of the thinner second plate thickness portion, so that a high reduction ratio is obtained with respect to the plate thickness of the third plate thickness portion. Can be achieved. As a result, a high pressure reduction ratio can be obtained with a relatively small reduction load, and the rolling apparatus can be downsized.
[0033]
In the molding process, since the blank material manufactured in the first to third rolling processes of the previous process is used, the dimensional accuracy of the vehicle body panel can be improved. That is, when the blank material is set on the die of the press machine, if the positioning is performed using the reference portion, the first plate thickness portion, the second plate thickness portion, and the third plate thickness portion are made to coincide with a predetermined position of the die. Thus, the dimensional accuracy of the body panel after plastic working can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a blank produced by a method for forming a vehicle body panel according to the present invention. FIG. 2 is a flowchart of a method for forming a vehicle body panel according to the present invention. FIG. 4 is a second explanatory view of a vehicle body panel forming method according to the present invention. FIG. 5 is a third explanatory view of a vehicle body panel forming method according to the present invention. FIG. 6 is a vehicle body panel according to the present invention. 4th explanatory diagram of the molding method
DESCRIPTION OF SYMBOLS 10 ... Blank material, 11 ... 1st board thickness part, 12 ... 2nd board thickness part, 12a ... Boundary (terminal step part of 2nd board thickness part), 13 ... 3rd board thickness part, 14 ... Flat plate, 21 ... Rolling apparatus, 41 ... press machine, 43 ... body panel, G1, G2, G3 ... rolling roll interval (roll gap), t1 ... plate thickness of first plate thickness portion, t2 ... plate thickness of second plate thickness portion, t3 ... the plate thickness of the third plate thickness portion, t4 ... the plate thickness intermediate between the plate thickness of the first plate thickness portion and the plate thickness of the third plate thickness portion.

Claims (1)

In order from one end (32) to the other end (33) of the flat plate (14) , the first plate thickness portion (11) and the second plate thickness portion ( thickness smaller than the first plate thickness portion (11)) ( 12) is formed by a rolling device, and the rest is left as a third plate thickness portion (13) having a plate thickness greater than that of the first plate thickness portion (11) ,
A method of forming a vehicle body panel using the flat plate (14) as a blank material (10) and forming it into a predetermined shape with a press machine (41) ,
While feeding the flat plate (14) to one side, the first plate thickness portion (11) and the second plate thickness portion (12) are changed to the plate thickness of the first plate thickness portion (11) and the third plate thickness portion. A first rolling step of rolling to a thickness (t4) intermediate to the thickness of (13) ;
A second rolling step of rolling to the plate thickness (t2) of the second plate thickness portion (12) while feeding the flat plate (14) to the other;
The rolling roll interval is set for the thickness of the first plate thickness portion (11) at the boundary (12a) between the first plate thickness portion (11) and the second plate thickness portion (12) , A third rolling step of rolling to the plate thickness (t1) of the first plate thickness portion (11) while feeding the flat plate (14) to the other;
A molding step of molding the obtained blank material (10) into a predetermined shape with the press machine (41) ,
In the first rolling step, an end of the third plate thickness portion (13) is used as a reference portion (15), and the second plate thickness portion (12) and a desired distance (L1) from the reference portion (15). The terminal step portion (13a) of the third plate thickness portion (13) that becomes the boundary of the third plate thickness portion (13) is sent from the one end (32) to the terminal step portion (13a) and molded,
In the second rolling step, the first plate thickness portion ( L2) has a distance from the reference portion (15) that is longer than the desired distance (L1) of the third plate thickness portion (13). 11) and the terminal step portion (12a) of the second plate thickness portion (12) , which is the boundary between the second plate thickness portion (12) , and the terminal step portion (13a) of the third plate thickness portion (13). ) Toward the one end (32) and molded,
In the molding step, the press portion (15) is placed on the press die (42) by placing the reference portion (15) against the positioning portion (36) of the press die (42) attached to the press machine (41). mold surface (42c, 42c) said end step portion of the at a predetermined position the third thickness portion the end step portion of (13) (13a) and the second thickness portion (12) of the mold (42) ( 12. A method for forming a vehicle body panel, characterized by forming after matching 12a) .

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