JP2010005663A - Hemming metal mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hemming metal mold achieving continuous hemming of car parts such as a door panel, an engine hood, a trunk lid and an end gate of a pickup truck, having different shape of some parts with high production efficiency by making a part of the metallic mold movable and freely changing the assembly of the metallic mold without changing the entire metallic mold. <P>SOLUTION: A part of the hemming metal mold is movable to an operation position and a waiting position, and the assembly of the hemming metal mold can be freely changed to the assembly thereof corresponding to presence/absence of the hemming of a desired part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hemming die that can move part of the die without changing the entire die and freely reassemble the die so that hemming of parts having different shapes can be continuously performed. .

  A press die or press that can continuously press parts of parts that have the same basic shape but different shapes in part by reassembling a part of the die without replacing the entire die. There is a processing method. A press die or a press working method using such a recombination die is preferable because economic die design and improvement in production efficiency are expected, and the following press die or press working method has been proposed. Yes.

  For example, Patent Document 1 proposes a partial bending mechanism that can efficiently perform bending of a workpiece having different positions of a plurality of bending lines with an inexpensive apparatus. That is, in a bending machine such as a panel bender, an elevating device is used inside the first bending die composed of a U-shaped bending member having a normal bending die and a reverse bending die formed by a standard bending die. There has been proposed a partial bending mechanism provided with a partial bending device that is rotated by a scissors action to be a second bending mold that can be projected and retracted.

  Further, in Patent Document 2, in a bending machine for a plate material or the like, an auxiliary die that is mounted on a lower surface of an upper die via a horizontal member is a combination of a main body portion and a detachable replacement unit portion, and the main body portion is an upper metal die. In the vicinity of the center of the lower part of the mold, a hollow portion approximate to a half-cylindrical shape is provided along the left-right longitudinal direction to enable normal hemming bending processing, and the detachable replacement unit portion exists in the bending processing region and There has been proposed a work pressing auxiliary die having a shape that can be adapted to hemming bending of a work having a flange portion that intersects the bending side.

Japanese Unexamined Patent Publication No. 2000-202529 JP 2001-198629

  The partial bending mechanism proposed in Patent Document 1 has an advantage that the second bending mold can be freely operated to continuously produce parts having different bending shapes. However, the partial bending mechanism is limited to the bending portion, and the hemming portion is limited. There are problems to apply. The work pressing auxiliary mold proposed in Patent Document 2 has an advantage that hemming processing of a component having a complicated shape is possible, but every time the processing shape is different, the operation of the apparatus is stopped, There is a problem that the mold must be replaced.

  In view of such a conventional problem, the present invention performs hemming processing of automobile parts such as a door panel, an engine hood, a trunk lid, and an end gate of a pickup truck, which have the same basic shape but a different shape. It is an object of the present invention to provide a hemming die that can be moved at a part of the die without changing the whole die so that the die can be freely reassembled and can be continuously produced with high production efficiency.

  The hemming die according to the present invention allows a part of the hemming die to be moved between an operating position and a standby position, and can be freely combined with a die corresponding to the presence or absence of hemming at a desired site. It is a type.

  Further, the hemming mold according to the present invention is different in that a part of the mold can be moved and the mold can be freely reassembled to have a common part on which hemming is performed and a specific part that is different depending on whether hemming is performed or not. A hemming die capable of processing a shaped object, comprising an upper die, a lower die assembled with a hemming die, and a cam slider movably disposed on the lower die, the cam slider When the cam slider is in the standby position, only the common part is processed by the upper mold and the lower mold. When the cam slider is in the operating position, the cam slider is a cam slider stopper provided in the lower mold. And the common part is processed by the upper mold and the lower mold, after being sandwiched by the cam slider receiver provided in the upper mold and fixed integrally with the lower mold, The specific portion of the hemming process is first performed by a pre-bending punch held by the pre-bending cam unit in cooperation with a pre-bending cam driver provided on the upper die and a pre-bending cam unit provided on the cam slider. Preliminary bending was performed by the hemming die, and then held by the main bending cam unit in cooperation with a main bending cam unit provided on the upper mold and a main bending cam driver provided on the cam slider. This is a hemming die in which main bending is performed by a main bending punch and the hemming die.

  Further, the hemming mold according to the present invention is different in that a part of the mold can be moved and the mold can be freely reassembled to have a common part on which hemming is performed and a specific part that is different depending on whether hemming is performed or not. A hemming die capable of processing a shaped object, comprising an upper die, a lower die assembled with a hemming die, and a cam slider movably disposed on the upper die, the cam slider When the cam slider is in the standby position, only the common part is processed by the upper mold and the lower mold, and when the cam slider is in the operating position, the cam slider is a cam slider stopper provided in the upper mold. And the upper die and the lower die, and the common part is processed by the upper die and the lower die. The hemming process of the specific portion is performed by first, a preliminary bending punch held by the preliminary bending cam unit by cooperation of a preliminary bending cam driver provided on the cam slider and a preliminary bending cam unit provided on the lower mold. Pre-bending was performed by the hemming die, and then held by the main bending cam unit by the cooperation of the main bending cam unit provided on the cam slider and the main bending cam driver provided on the lower mold. This is a hemming die in which main bending is performed by a main bending punch and the hemming die.

  In the above invention, the pre-bending cam driver is configured so that the operation time from the pre-bending completion position of the pre-bending punch to the initial position is shorter than the operation time from the initial position of the pre-bending punch to the pre-bending completion position. It is good to be.

  According to the hemming mold according to the present invention, a part of the mold can be moved and the mold can be freely reassembled without exchanging the entire mold, so that the hemming process for parts having different shapes can be continuously increased. It can be done with production efficiency. For this reason, this hemming mold is suitable for hemming of automotive parts such as door panels, engine hoods, trunk lids, pickup truck end gates, etc., which have the same basic shape but various shapes depending on the vehicle type. can do.

  The best mode for carrying out the invention will be described below. The hemming die according to the present invention allows a part of the hemming die to be moved between an operating position and a standby position, and can be freely combined with a die corresponding to the presence or absence of hemming at a desired site. It is a type. According to the present hemming die, for example, the end gates of pickup trucks having different shapes as shown in FIGS. 1 and 2 can be continuously processed without stopping the production line and changing the die. Can be performed with high accuracy and high efficiency.

  The overall shape of the end gate shown in FIGS. 1 and 2 is substantially the same, but only the shape of the upper surface of the end gate is different. The top surface portion of the end gate shown in FIG. 2 has a shape in which a recess is provided in the central portion of the top surface portion (region b) of the end gate shown in FIG. That is, the central portion (region c) of the upper surface portion in FIG. 2 is recessed as shown in FIG. The end gate shown in FIGS. 1 and 2 is a common portion where the common hemming process is performed in the region (a), and the region (b) is a specific portion without the hemming process. The area c is a part in the area b where hemming is performed.

  Examples of hemming dies for performing such end gate hemming are shown in FIGS. According to the present invention, the processing of the two types of end gates shown in FIGS. 1 and 2 can be performed continuously with high accuracy and high efficiency by using one mold shown in FIGS. FIG. 3 is a plan view schematically showing the lower part 10 of the hemming die. As shown in FIG. 3, a pre-bending punch 155 (155D, 155R, 155L) for pre-bending the region a shown in FIG. 2 is provided around the hemming die 12 set on the lower main body 11 of the lower die 10. ) And a pre-bending punch 255 for pre-bending the region C.

  4 and 5 are partial sectional views including the lower die 10, the cam slider 20, and the upper die 30 of the AA cross-section portion shown in FIG. FIG. 4 shows a case where a part of the present hemming die is in the standby position, that is, a case where the cam slider 20 is in the standby position, and FIG. 5 shows a case where the cam slider 20 is in the operating position. 6 shows a partial cross-sectional view including the lower die 10 and the upper die 30 of the BB cross-section portion shown in FIG. 3 of the present hemming die. The CC cross section and the DD cross section shown in FIG. 3 are the same as those in FIG.

  As shown in FIG. 4, the AA cross section of this hemming die is composed of a lower die 10, a cam slider 20 that is movably disposed on the lower die 10, and an upper die 30. A hemming die 12 and a cylinder 18 are assembled to the lower mold body 11 of the lower mold 10, and a cylinder rod 185 of the cylinder 18 is connected to the cam slider 20. The lower mold body 11 is provided with a cam slider stopper 114 and a cam slider guide 118 (FIG. 3).

  As shown in FIG. 4, the cam slider 20 includes a cam slider body 21, a thrust plate 217, slide plates 218 and 219 disposed on the cam slider body 21, a preliminary bending cam unit 25, and a main bending cam driver 26. is doing.

  The preliminary bending cam unit 25 includes an arm plate 251 pivotally supported on the bracket 258 via a pin 253, a holder 254 held by the arm plate 251, a preliminary bending punch 255 held by the holder 254, and an arm plate 251. And a spring 256 that is locked to the arm plate 251 and the bracket 258 and biases the arm plate 251 rightward in the drawing.

  The upper mold 30 includes an upper mold body 31, a main bending cam unit 35 disposed on the upper mold body 31, a cam slider receiver 315, and a preliminary bending cam driver receiver 316. The preliminary bending cam driver receiver 316 is provided with a preliminary bending cam driver 36.

  The final bending cam unit 35 includes an arm plate 351 pivotally supported by a bracket 358 via a pin 353, a holder 354 held by the arm plate 351, a final bending punch 355 held by the holder 354, and an arm plate 351. And a spring 357 that is locked to the arm plate 351 and the bracket 358 and urges the arm plate 351 in the right direction in the figure.

  The cam slider 20 can be smoothly moved to the standby position and the operating position along the cam slider guide 118 by the operation of the cylinder 18. As shown in FIG. 5, at the operating position of the cam slider 20, the front and rear of the cam slider 20 are fixed by a cam slider receiver 315 via a cam slider stopper 114 and a thrust plate 217, and the left and right sides of the cam slider 20 are passed via a slide plate 218. It is fixed by the cam slider guide 118 (FIG. 3). As a result, the cam slider 20 is fixed integrally with the lower mold 10, so that highly accurate hemming can be performed.

  As shown in FIG. 6, the BB cross-sectional portion of the present hemming die is composed of a lower die 10 and an upper die 30. A hemming die 12 is assembled to the lower mold body 11 of the lower mold 10 and a preliminary bending cam unit 15 is disposed.

  The preliminary bending cam unit 15 includes a preliminary bending cam unit main body 150, a bracket 16 fixed to the lower mold main body 11, and link plates 153 and 154. The link plates 153 and 154 are pivotally supported on the preliminary bending cam unit main body 150 side via pins 158 and 159, and are pivotally supported on the arm 163 of the bracket 16 via pins 148 and 149. The link plates 153 and 154 form parallel links with the pins 148 and 149 pivotally supported by the arm 163 as fixed points and the pins 158 and 159 pivotally supported by the preliminary bending cam unit main body 150 as movable points.

  Further, the pre-bending cam unit 15 is locked to the roller 156 pivotally supported by the link plate 153, the pre-bending cam unit main body 150, and the pole 164 of the bracket 16, and urges the pre-bending cam unit main body 150 leftward. A spring 157 and a preliminary bending punch 155 held by the preliminary bending cam unit main body 150 are provided.

  The upper mold body 31 of the upper mold 10 is provided with a main bending punch 33 and a preliminary bending cam driver receiver 317. The preliminary bending cam driver receiver 317 is provided with a preliminary bending cam driver 37.

  In the present invention, when the parts shown in FIG. 1 are processed by the hemming die, the cam slider 20 is controlled to the standby position, and after the outer panel 51 and the inner panel 53 are set on the hemming die 12, When the mold 10 is lowered, the peripheral portion 513 (region A) of the outer panel 51 is hemmed. On the other hand, when the parts shown in FIG. 2 are processed, the cam slider 20 is controlled to the operating position, and after the outer panel 51 and the inner panel 53 are set on the hemming die 12, the upper die 10 is lowered. A hemming process is performed on the peripheral portion 513 (region A) of the outer panel 51 and a hemming process is performed on the peripheral portion 514 (region C).

  Hereinafter, the case where hemming of the component shown in FIG. 2 is performed will be described. FIG. 7 is an explanatory diagram in the case where the preliminary bending of the region C is performed, and FIG. 8 is an explanatory diagram in the case of performing the main bending of the region C. FIG. 9 is an explanatory diagram when performing the pre-bending and the main bending of the area (a).

  The preliminary bending of the area C is performed as follows. As shown in FIG. 7, when the upper mold 30 is lowered and the preliminary bending cam driver 36 comes into contact with the roller 256, the preliminary bending cam unit 25 is centered on the pin 253 against the spring 257 as the upper mold 30 is lowered. Rotating counterclockwise, the pre-bending punch 255 approaches the hemming die 12 (FIG. 7A). Further, when the upper die 30 is lowered, the preliminary bending punch 255 comes into contact with the peripheral edge portion 514 of the outer panel 51 that has been bent in advance to the preliminary bending possible angle, and the peripheral edge portion 514 is subjected to preliminary bending processing (FIG. 7B). When the roller 256 reaches the top dead center of the pre-bending cam driver 36 and the pre-bending process of the peripheral portion 514 is finished, the roller 256 moves along the pre-bending cam driver 36 as the upper die 30 is lowered by the action of the spring 257. The preliminary bending cam unit 25 is rotated to the right, and the preliminary bending punch 255 is separated from the hemming die 12 (FIG. 7C).

  When the pre-bending punch 255 starts to move away from the hemming die 12, the main bending cam unit 35 starts to operate and main bending is performed. As shown in FIG. 8, when the upper die 30 is lowered and the roller 356 comes into contact with the main bending cam driver 26, the roller 356 moves along the inclined surface of the main bending cam driver 26. At this time, the main bending cam unit 35 is rotated clockwise around the pin 353 against the spring 357 as the upper die 30 descends (FIG. 8A), and the main bending punch 355 is moved to the hemming die 12. It approaches and comes into contact with the peripheral edge portion 514 of the outer panel 51 that has undergone the preliminary bending process.

  Since the roller 356 moves along the inclined surface of the main bending cam driver 26 as the upper die 30 descends, the peripheral bending portion 514 is bent by receiving an oblique downward pressing force. It is done. When the roller 356 reaches the straight portion of the main bending cam driver 26, the peripheral edge portion 514 is completely bent, and the main bending cam unit 35 is in a vertical state (FIG. 8B). As it descends, the peripheral portion 514 is pressed in the vertical direction by the main bending punch 355, and the peripheral portion 514 is finally bent.

  In the hemming process in which the preliminary bending process is first performed with the lowering of the upper die 30 and the main bending process is performed next, after the preliminary bending process of the peripheral portion 514 is completed by the preliminary bending punch 255, the preliminary bending process is performed. The punch 255 is preferably retracted immediately so as not to interfere with the main bending punch 355. In particular, when hemming is performed at a depressed position such as the hemming of the area C in this example, the preliminary bending punch 255 is preferably retracted as soon as possible. For this reason, the pre-bending cam driver 36 has a time until the pre-bending punch 255 returns to the original initial position after the pre-bending process is completed, i.e., from the pre-bending completion position of the pre-bending punch 255 to the initial position. It is preferable that the operation time be shorter than the operation time from the initial position of the pre-bending punch 255 where the pre-bending process is performed to the pre-bending process completion position.

  When the hemming process of the area C described above is performed, the hemming process as shown in FIG. 9 is performed in the area A. That is, as shown in FIG. 9, when the preliminary bending cam driver 37 contacts the roller 156 as the upper die 30 is lowered, the roller 156 moves along the inclined surface of the preliminary bending cam driver 37. At this time, the preliminary bending cam unit 15 is lowered while being rotated clockwise against the spring 157 by the parallel links 153 and 154, and the preliminary bending punch 155 approaches the hemming die 12 (FIG. 9A). Further, when the upper mold 30 is lowered, the preliminary bending punch 155 comes into contact with the peripheral portion 514 of the outer panel 51 bent at a pre-bendable angle, and the peripheral portion 514 receives an oblique downward pressing force by the preliminary bending punch 155. Then, a preliminary bending process is performed (FIG. 9B). When the roller 156 reaches the top dead center of the preliminary bending cam driver 37, the preliminary bending of the peripheral edge portion 514 is completed (FIG. 9C).

  When the pre-bending process of the peripheral edge portion 514 is completed, the roller 156 moves along the upper inclined surface of the pre-bending cam driver 37 while receiving the pressing force of the spring 157 as the upper die 30 is lowered, and the pre-bending punch 155 is inclined upward. Move away from hemming die 12.

  After the preliminary bending punch 155 is sufficiently separated from the hemming die 12, the main bending punch 33 that has been lowered with the lowering of the upper die 30 comes into contact with the peripheral edge portion 514 where the preliminary bending has been completed, and the main bending punch 33 is lowered with the lowering of the upper die 30. Thus, the main bending process is performed (FIG. 9D).

  In the hemming die according to the present invention, the end gate hemming shown in FIG. 2 is performed in such a state that the cam slider 20 is integrated with the lower die 10 as described above. For this reason, the end gate hemming can be performed with high accuracy and efficiency by the present hemming die.

  In the above, the hemming metal mold | die which can perform the hemming process of the end gate shown in FIG.1 and FIG.2 with high precision and efficiency was demonstrated. However, the hemming die according to the present invention is not limited to the above embodiment. For example, the present invention can be applied to automobile parts such as door panels other than the end gate, and can also be applied to a case where hemming as shown in the area C (FIG. 2) is performed on the entire area B (FIG. 1).

  A plurality of cam sliders 20 can be provided. Thereby, it is possible to configure a hemming die that can continuously perform hemming of various parts having different numbers and ranges of the presence / absence of hemming. That is, it is possible to configure a hemming die that can be freely reassembled into a die corresponding to the presence or absence of hemming at a desired site.

  The cam slider 20 can be movably disposed on the upper mold 30. When a plurality of cam sliders 20 are provided, an optimal mold design can be performed by dividing the cam sliders 20 and arranging them on the lower mold 10 or the upper mold 30. An embodiment in which the cam slider 20 is disposed in the upper mold 30 is shown in FIGS. FIG. 10 shows the case where the cam slider 20 is in the standby position, and FIG. 11 shows the case where the cam slider 20 is in the operating position.

  As shown in FIG. 10, the cam slider 20 disposed on the upper mold 30 is movable to a standby position and an operating position by a cylinder 18. The cam slider 20 includes a thrust plate 217, a preliminary bending cam driver 36, and a main bending cam unit 35.

  The lower mold 10 to which the hemming die 12 is assembled is provided with a preliminary bending cam unit 25, a main bending cam driver 26, and a cam slider receiver 115, and the upper mold 30 is provided with a cam slider stopper 314.

  As shown in FIG. 11, the cam slider 20 movably disposed on the upper mold 30 is disposed on the lower mold 10 via a cam slider stopper 314 provided on the upper mold 30 and a thrust plate 217 at the operating position. It is clamped by the cam slider receiver 115 and is fixed to the upper mold 30 integrally. After the cam slider 20 is integrally fixed to the upper mold 30, the common part is processed by the upper mold 30 and the lower mold 10 as in the case where the cam slider 20 is movably disposed on the lower mold 10. At the same time, the hemming of the specific part is performed as follows.

  That is, first, the prebending punch 255 and the hemming die 12 held by the prebending cam unit 25 by the cooperation of the prebending cam driver 36 provided on the cam slider 20 and the prebending cam unit 25 provided on the lower die 10. And then the book held on the main bending cam unit 35 by the cooperation of the main bending cam unit 35 provided on the cam slider 20 and the main bending cam driver 26 provided on the lower die 10. The main bending is performed by the bending punch 355 and the hemming die 12. In this way, even when the cam slider 20 is movably disposed on the upper mold 30, the hemming die in this hemming die is partially hemmed depending on whether hemming is performed or not. Processing can be performed with high accuracy and efficiency.

It is drawing which shows the perspective view of the end gate of the example which does not have hemming in an upper surface part (area | region B), and its partial sectional drawing. In FIG. 1, it is drawing which shows the perspective view of the end gate of the example which has hemming in the center part (area | region C) of the area | region B, and its partial sectional view. It is drawing explaining the structure of the lower mold | type part of the hemming metal mold | die which processes the end gate shown in FIG.1 and FIG.2. FIG. 4 is a partial cross-sectional view at a bottom dead center including an upper die and a lower die of the AA cross section in FIG. 3 when the cam slider is in a standby position. FIG. 4 is a partial cross-sectional view in a final bending state including an upper die and a lower die of the AA cross-section portion in FIG. 3 when the cam slider is in an operating position. FIG. 4 is a partial cross-sectional view before a pre-bending process including an upper die and a lower die of a BB (CC, DD) cross section in FIG. 3. It is explanatory drawing when performing a pre-bending process in the hemming process of area | region c. It is explanatory drawing when performing this bending process in the hemming process of area | region c. It is explanatory drawing when performing the hemming process (preliminary bending and this bending process) of the area | region i. It is a partial cross section figure in case the cam slider of the Example by which the cam slider was arrange | positioned by the upper mold | type is in a standby position. It is a partial cross section figure in case the cam slider of the Example by which the cam slider was arrange | positioned by the upper mold | type is in an operation position.

Explanation of symbols

10 Lower mold
11 Lower mold body
114 Cam slider stopper
115 Cam slider holder
118 Cam slider guide
12 Hemming die
148, 149 pins
15 Pre-bending cam unit
150 Pre-bending cam unit body
153, 154 Link plate
155 Pre-bending punch
157 Spring
158, 159 pins
16 Bracket
163 Arm
164 Paul
18 cylinders
185 cylinder rod
20 Cam slider
21 Cam slider body
217 Thrust plate
218, 219 slide plate
25 Pre-bending cam unit
251 Arm plate
253 pins
254 holder
255 Pre-bending punch
256 rollers
257 Spring
258 Bracket
26 bending cam drivers
30 Upper mold
31 Upper body
314 Cam slider stopper
315 Cam slider holder
316, 317 Pre-bending cam driver receiver
33 bending punches
35-bending cam unit
351 Arm plate
354 holder
355 bending punches
356 Laura
357 Spring
358 bracket
36, 37 Pre-bending cam driver
51 Outer panel
513, 514
53 Inner panel

Claims (4)

  A hemming die that allows a part of the hemming die to be moved between an operating position and a standby position, and can be freely combined with a die corresponding to the presence or absence of hemming at a desired portion. Hemming metal molds that can move parts of the metal molds and freely reassemble the molds to process different shapes with common parts that are hemmed and specific parts that differ depending on the presence or absence of hemming Type,
An upper die, a lower die assembled with a hemming die, and a cam slider movably disposed on the lower die;
When the cam slider is in the standby position, only the common part is processed by the upper mold and the lower mold,
When the cam slider is in the operating position, the cam slider is sandwiched between a cam slider stopper provided on the lower mold and a cam slider receiver provided on the upper mold and fixed integrally with the lower mold.
The common part is processed by the upper mold and the lower mold,
The hemming process of the specific portion is first performed by a prebending punch held by the prebending cam unit by cooperation of a prebending cam driver provided on the upper mold and a prebending cam unit provided on the cam slider. Pre-bending is performed with the hemming die,
Next, the main bending is held by the main bending punch held by the main bending cam unit and the hemming die in cooperation with the main bending cam unit provided on the upper mold and the main bending cam driver provided on the cam slider. Hemming mold is performed. Hemming metal molds that can move parts of the metal molds and freely reassemble the molds to process different shapes with common parts that are hemmed and specific parts that differ depending on the presence or absence of hemming Type,
An upper die, a lower die assembled with a hemming die, and a cam slider movably disposed on the upper die,
When the cam slider is in the standby position, only the common part is processed by the upper mold and the lower mold,
When the cam slider is in the operating position, the cam slider is sandwiched between a cam slider stopper provided on the upper mold and a cam slider receiver provided on the lower mold and fixed integrally with the upper mold.
The common part is processed by the upper mold and the lower mold,
The hemming process of the specific portion is performed by first, a preliminary bending punch held by the preliminary bending cam unit by cooperation of a preliminary bending cam driver provided on the cam slider and a preliminary bending cam unit provided on the lower mold. Pre-bending is performed with the hemming die,
Next, the main bending punch is held by the main bending cam unit and the hemming die by the cooperation of the main bending cam unit provided on the cam slider and the main bending cam driver provided on the lower mold. Hemming mold is performed.   The pre-bending cam driver is shaped such that the operation time from the pre-bending completion position of the pre-bending punch to the initial position is shorter than the operation time from the initial position of the pre-bending punch to the pre-bending completion position. The hemming die according to claim 2 or 3, wherein the die is a hemming die.

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