JP7317699B2 - press mold - Google Patents

Description

The present invention relates to a press mold, particularly a press that performs secondary forming on a plate material that has been primarily formed in a previous process and whose peripheral edge has been cut, so that the end portion of the plate material is bent into a substantially U-shaped cross section. Regarding types.

Press dies are widely used to form metal plates, including vehicle panels. There are various forms of plate material using press dies, and there are various forming processes as well. However, in cases where high designability is required, such as for vehicle panels, cutting called trim is performed after primary forming called draw. In the process, the peripheral portion of the plate material is cut, and then secondary forming called restrike is often performed. In this secondary molding, there are a wide variety of processing methods and processing steps when bending the end portion of the plate material into a substantially U-shaped cross section using a press die. The simplest method is to use a combination of a die and a punch to dent the plate material.

JP-A-10-142390

By the way, burrs may be formed on the periphery of the plate in the cutting process, and depending on the material of the plate, the burrs may be removed in the process of bending the ends of the plate into a substantially U-shaped cross section. The removed burr adheres to the press die as a foreign matter, and the adhering foreign matter may cause damage to the press-molded product. However, it is difficult to prevent the burrs from being removed by the method of bending the sheet material using the combination of the die and the punch. There is a trade-off in that the cross-sectional shape accuracy is reduced. For example, such a problem may become conspicuous when the plate material of the vehicle roof panel to be press-formed is changed from steel to aluminum.

The present invention has been made in view of the above-mentioned problems, and its object is to remove burrs from the periphery of the plate material during the cutting process while ensuring the accuracy of the cross-sectional shape of the bent end portion of the plate material. To provide a press die that does not wear out.

In order to achieve the above object, the press die of the present invention
In a press die for bending the end portion of the plate material into a substantially U-shaped cross section by performing secondary forming on the plate material which has been primarily formed in the previous step and the peripheral edge portion has been cut,
a lower presser provided on the lower mold, configured to move together with the lower mold and movable in a direction separating and contacting the upper mold independently of the movement of the lower mold, and supporting the lower surface of the plate material; , is provided on the upper mold, is configured to move together with the upper mold, and is configured to be movable in a direction separating and contacting the lower mold separately from the movement of the upper mold, and supports the upper surface of the plate material. An upper pressing portion capable of holding the plate material together with the lower pressing portion, and an upper blade provided on the upper mold, which protrudes from the upper pressing portion and the lower pressing portion as the upper mold moves downward. An upper blade for sandwiching the edge of the plate material with the lower holding portion and bending it downward into a substantially L-shape; a lower blade that bends upward the edge of the plate material protruding from the upper blade and the lower holding part, and the upper end surface of the lower blade does not contact only the peripheral edge of the edge of the plate material. It is characterized by having a non-contact structure.

According to this configuration, when bending the end portion of the plate material into a substantially U-shaped cross section, the plate material is first held between the upper pressing portion and the lower pressing portion, and then the upper pressing portion is moved downward by the upper die. The end portion of the plate material protruding from the part and the lower pressing portion is bent downward into a substantially L shape so that it is sandwiched between the upper blade and the lower pressing portion. Next, the plate material is moved downward together with the upper pressing portion and the lower pressing portion by the further downward movement of the upper die, and the end portion of the plate material protruding from the upper blade and the lower pressing portion is moved upward by the lower blade. The end portion of the plate material is thereby bent into a substantially U-shaped cross section. This two-stage bending process performed by one press die can ensure the accuracy of the cross-sectional shape of the substantially U-shaped bending process. Even if there is a burr, the burr will not be removed.

Another configuration of the present invention is characterized in that the non-contact structure is formed by chamfering an end portion of the upper end surface of the lower blade on the plate material side.

According to this configuration, only by chamfering the edge of the upper end surface of the lower blade on the plate material side, the lower blade can be made non-contact with the peripheral edge portion of the plate while ensuring the dimensions of the lower blade. It is possible to easily obtain a configuration in which the accuracy of the bending cross-sectional shape is ensured and burrs are not removed.

A further configuration of the present invention is characterized in that the non-contact structure is formed in a relief shape having a lower height on the side farther from the plate material than the plate material side of the upper end face of the lower blade.

According to this configuration, since the edge portion of the edge of the plate protrudes from the upper blade and the lower holding portion, the lower blade can be adjusted in size simply by lowering the side of the upper end surface of the lower blade farther from the plate. It is possible to achieve non-contact with the peripheral portion of the plate material while securing it, and it is possible to easily obtain a configuration in which burrs are not removed while ensuring the accuracy of the U-shaped bending cross-sectional shape.

According to a further configuration of the present invention, the plate material is a vehicle roof panel, and the bending process of the substantially U-shaped cross section is performed on vehicle side end portions of the roof panel along the vehicle front-rear direction. It is characterized by

According to this configuration, it is possible to bend the vehicle side end portions of the vehicle roof panel into a substantially U-shape with excellent cross-sectional shape accuracy without any defects.

A further configuration of the present invention is characterized in that the plate material is made of aluminum.

According to this configuration, it is possible to bend the plate material made of aluminum into a substantially U-shape without defects and with excellent cross-sectional shape accuracy.

As described above, according to the present invention, even if burrs are formed on the periphery of the plate material in the cutting process, the burrs are not removed, and the ends of the plate material are bent into a substantially U-shape with excellent cross-sectional shape accuracy. Since it can be processed, it becomes possible to perform a favorable bending process on plate materials made of various materials.

1 is a schematic configuration diagram showing an embodiment of a press apparatus to which a press die of the present invention is applied; FIG. FIG. 2 is an operation explanatory view of the press device of FIG. 1; 1. It is detailed explanatory drawing of press molding by the press apparatus of FIG. 1. It is detailed explanatory drawing of press molding by the press apparatus of FIG. FIG. 2 is an operation explanatory view of the press device of FIG. 1; 1. It is detailed explanatory drawing of press molding by the press apparatus of FIG. FIG. 7 is a detailed view of the peripheral portion of the press-formed product of FIG. 6; It is a detailed explanatory view of press molding by a conventional press mold. It is a detailed explanatory view of press molding by a conventional press mold. FIG. 10 is a detailed view of the peripheral portion of the plate member in FIG. 9;

EMBODIMENT OF THE INVENTION Below, embodiment of the press die of this invention is described in detail with reference to drawings. FIG. 1 is a schematic configuration diagram of a press apparatus to which the press die of this embodiment is applied. In FIG. 3, a flat plate material P is clamped by the apparatus, but the actual plate material P to be press-formed in this embodiment has undergone primary forming in the preceding process, for example, as shown in FIG. there is Also, the drawing is greatly simplified and exaggerated for ease of understanding, but the actual equipment and press dies are, as is well known, very precise.

The plate material P to be press-formed in this embodiment is a vehicle roof panel, and in this embodiment, it is assumed that the plate material P made of aluminum is press-formed. As described above, the plate material P is subjected to primary forming in the preceding process, and then the peripheral edge portion S is cut in the cutting process. This press machine is for press-forming a series of depressions elongated in the longitudinal direction of the vehicle in both vehicle side end portions of the roof panel. It becomes a processed cross-sectional shape.

The lower half of FIG. 1 is a lower mold 1, and the upper half is an upper mold 2. The lower mold 1 is a fixed mold, and the upper mold 2 is separated from and contacted with the lower mold 1 by a drive source (not shown). It is movable. A recessed portion is provided on the upper surface of the central portion of the lower mold 1, and the lower pressing portion 3 is inserted into this recessed portion. The lower pressing portion 3 supports the lower surface of the plate material P, and is configured to be separable and contactable with respect to the upper die 2 by a drive source (not shown). Similarly, a recessed portion is also provided on the lower surface of the central portion of the upper die 2, and the upper pressing portion 4 is inserted into this recessed portion. The upper pressing portion 4 supports the upper surface of the plate material P, and is configured to be separable and contactable with respect to the lower die 1 by a drive source (not shown). Therefore, the plate material P is held between the two pressing portions 3 and 4 by having the upper surface supported by the upper pressing portion 4 and the lower surface supported by the lower pressing portion 3 .

On both sides of the lower surface of the upper mold 2 immediately adjacent to the upper pressing portion 4, the end portion T of the plate material P protruding from the upper pressing portion 4 and the lower pressing portion 3 is substantially L-shaped (reversed on the left side of the figure). An upper blade 5 is formed for bending downward into a substantially L shape. The upper blade 5 is provided continuously in the direction perpendicular to the plane of the drawing. Further, when the upper die 2 is moved downward, the edge T of the plate material P bent into a substantially L-shape and the storage recess 7 for storing the upper blade 5 are formed on both sides of the lower pressing portion 3 in the figure. formed at the ends. That is, the end portion T of the plate material P protruding from the upper pressing portion 4 and the lower pressing portion 3 is sandwiched between the upper blade 5 and the storage recess 7 of the lower pressing portion 3 as the upper die 2 moves downward. and bent downward into a substantially L-shape.

On the other hand, on both sides of the upper surface of the lower die 1 near the lower pressing portion 3, the end portion T of the plate material P protruding from the storage recess 7 of the upper blade 5 and the lower pressing portion 3 is bent upward. A lower blade 6 is formed for this purpose. Like the upper blade 5, the lower blade 6 is provided continuously in the direction perpendicular to the plane of the drawing. Further, on the upper end surface of the upper blade 5 on the side of the lower pressing portion 3, a plate material receiving portion 8 is formed to receive the end portion T of the plate material P that has been bent by the upper blade 5. As shown in FIG. Although not shown in FIG. 1, for example, as shown in FIG. 3, a so-called R chamfer 9 is applied to the upper corner of the lower blade 6 where the plate material receiving portion 8 is formed. The round chamfering 9 contacts the end portion T of the plate material P to perform the bending process, and after the bending process, the portion of the round chamfering 9 separates from the plate material P so that the peripheral edge portion S of the plate material P is lowered. It is configured so as not to come into contact with the blade 6 (non-contact). Furthermore, as shown in FIG. 3, the upper end surface of the lower blade 6 has a relief shape in which the portion farther from the plate material P is lower than the portion on the plate material P side. Contact with S is avoided (no contact).

Next, press molding, specifically bending, by the press apparatus shown in FIG. 1 will be described. As described above, FIG. 1 shows a state in which the upper and lower surfaces of the plate P are held (set) between the upper pressing portion 4 and the lower pressing portion 3. (draw) and edge cutting (trimming). In this state, the storage recess 7 of the lower pressing portion 3 is positioned above the lower blade 6 of the lower die 1. As shown in FIG. From this state, when only the upper die 2 is moved downward without moving the upper pressing portion 4 and the lower pressing portion 3, as shown in FIG. The upper blade 5 of the upper die 2 presses down the end T of the plate material P, and the plate material P is bent downward into a substantially L shape so as to be sandwiched between the upper blade 5 and the storage recess 7 of the lower holding portion 3 . Details of this processing are shown in FIGS. A plate material P used as a roof panel for a vehicle is bulged in the primary molding of the preceding process, for example, so that the central portion in the left-right direction in FIG. is slightly bent downwards. The left and right inner corners of the upper blade 5 come into contact with the (overhanging) side ends T of the plate P, and eventually the entire upper blade 5 comes into contact with the ends T of the plate P as shown in FIG. The plate material P is sandwiched between the upper blade 5 and the housing recess 7 of the lower pressing portion 3 and is bent downward into a substantially L (reversed L) shape. At this time, the peripheral edge portion S of the plate material P protrudes from the upper blade 5 and the housing recess 7 of the lower holding portion 3, but does not contact the lower blade 6 anywhere.

When the upper die 2 is moved further downward from the state shown in FIG. An end portion T of the plate material P protruding from the concave portion 7 abuts on the lower blade 6 . When the upper die 2 is moved downward to the lower end, as shown in FIG. 5, the edge T of the plate material P protruding from the storage recess 7 of the upper blade 5 and the lower holding part 3 is bent upward. The end portion T of P is bent into a substantially U-shape as a whole. 6 is a detailed view of the edge portion T of the plate material in the state of FIG. 5, and FIG. 7 is a detailed view of the peripheral portion S of the plate material P (press-molded product). The edge T of the plate material P that has been bent upward is housed in the plate material receiving portion 8 of the lower die 1, but the upper corner corner of the lower blade 6 on the plate material P side that has been subjected to the R chamfering 9 is is not in contact with the peripheral edge portion S of the plate material P. As can be inferred from FIGS. 4 and 6, even during the bending process by the lower blade 6, the upper end surface of the lower blade 6 is in a recessed shape that slopes down on the side farther from the plate material P. does not come into contact with the peripheral edge portion S of the plate material P. As a result, the depth of the plate material receiving portion 8 of the lower blade 6 (the height of the lower blade 6) can be set to a sufficient size, so that the shape of the plate material P at the end portion T, which has been bent upward, can be improved. Accuracy can be ensured. That is, it is possible to ensure the accuracy of the cross-sectional shape of the substantially U-shaped bent portion formed at the end portion T of the plate material.

In the aluminum plate material P of this embodiment, in the previous step of cutting the peripheral edge portion, for example, a small burr is generated in the lower portion of the peripheral edge portion S of the plate material end portion T in FIG. Burrs are removed. It is desirable for the press-formed product to have the burrs removed, but if the burrs that have been removed adhere to the press die as foreign matter, the press-formed product will be damaged during subsequent press forming. becomes. In contrast, in the press die of the press apparatus of this embodiment, as described above, the press die does not come into contact with the peripheral edge portion S of the plate material P. Therefore, even if burrs are generated in the cutting process, they No burrs are removed. It should be noted that, due to the nature of the product, there is no problem even if the burrs remain in the peripheral portion S of the press-formed product.

This roof panel has previously been of similar shape and made of steel. 8 and 9 are detailed views of a conventional press die for press-molding the steel plate material P', and FIG. 10 is a further detailed view of the steel plate material peripheral portion S' in FIG. As is clear from the figure, the conventional press die is a combination of a die of the lower die 1' and a punch of the upper die 2' to recess the end portion T' of the steel plate into a substantially U-shape. . At this time, as clearly shown in FIG. 10, the peripheral edge portion S' of the steel plate material P' comes into contact with the lower die 1'. In the case of the steel plate material P', burrs were generated in the peripheral edge portion S' during the cutting process, and the burrs could not be removed even when the peripheral edge portion S' of the plate material came into contact with the lower die 1' in the secondary forming. However, in the case of the aluminum plate material P, the burrs on the peripheral edge S generated in the cutting process are removed when they come into contact with the lower die 1'. Further, even if the burr cannot be removed, contact with the burr may damage the lower mold 1', and the damage may cause scratches on subsequent press-molded products. Therefore, if the contact portion of the punch is lowered so that the lower die 1' does not come into contact with the peripheral edge portion S of the aluminum plate material P, the end portion T cannot be raised sufficiently upward, resulting in a decrease in shape accuracy.

On the other hand, in the press die of this embodiment, in which a substantially U-shaped cross-sectional shape is formed by performing two stages of bending in one secondary forming process, the lower blade 6 is positioned at the peripheral edge S of the plate material P. Therefore, even if a burr is formed on the peripheral edge portion S of the plate material P in the cutting process, the burr will not be removed. Therefore, the height of the lower blade 6, more precisely, the depth of the plate material receiving portion 8 of the lower blade 6 can be made sufficiently large. Cross-sectional shape accuracy can be ensured.

As described above, in the press die of the above-described embodiment, when bending the end portion T of the plate material P into a substantially U-shaped cross section, the plate material P is first held between the upper pressing portion 4 and the lower pressing portion 3. In this state, the end portion T of the plate material P protruding from the upper pressing portion 4 and the lower pressing portion 3 is sandwiched between the upper blade 5 and the lower pressing portion 3 of the upper die 2 by the downward movement of the upper die 2. Then, the plate material P is moved downward together with the upper pressing part 4 and the lower pressing part 3 together with the upper pressing part 4 and the lower pressing part 3 by further downward movement of the upper die 2, The end portion T of the plate material P protruding from the blade 5 and the lower pressing portion 3 is bent upward by the lower blade 6 of the lower die 1, whereby the end portion T of the plate material P is bent into a substantially U-shaped cross section. be. This two-step bending process performed by one press die can ensure the accuracy of the cross-sectional shape of the substantially U-shaped bending process. Even if there is a burr on the peripheral edge portion S of P, the burr will not be removed.

In addition, by simply chamfering the edge of the upper end surface of the lower blade 6 on the side of the plate material P, the lower blade 6 can be made non-contact with the peripheral edge portion S of the plate material P while ensuring the dimensions of the lower blade 6. It is possible to easily obtain a structure in which burrs are not removed while ensuring the accuracy of the cross-sectional shape by bending.

In addition, since the peripheral edge portion S of the end portion T of the plate material P protrudes from the upper blade 5 and the lower holding portion 3, the lower blade 6 can be removed by simply lowering the side of the upper end surface of the lower blade 6 farther from the plate material P. It is possible to keep the plate material P from contact with the peripheral edge portion S while ensuring the dimension of , and it is possible to easily obtain a configuration in which burrs are not removed while ensuring the accuracy of the U-shaped bending cross-sectional shape.

Further, the vehicle side end portions T of the vehicle roof panel can be bent into a substantially U-shape with excellent cross-sectional shape accuracy without defects.

In addition, the plate material P made of aluminum can be bent into a substantially U-shape with excellent cross-sectional shape accuracy without any defects.

Although the press die according to the embodiment has been described above, the present invention is not limited to the configuration described in the above embodiment, and various modifications are possible within the scope of the present invention. For example, in the above-described embodiment, the upper pressing portion 4 and the lower pressing portion 3 are configured to be driven by individual drive sources. It is also possible to adopt a configuration in which the lower presser portion 3 moves downward later than the downward movement.

1 lower die 2 upper die 3 lower holding part 4 upper holding part 5 upper blade 6 lower blade 9 R chamfering P plate material T (plate material) edge S (plate material) peripheral edge

Claims (5)

In a press die for bending the end portion of the plate material into a substantially U-shaped cross section by performing secondary forming on the plate material which has been primarily formed in the previous step and the peripheral edge portion has been cut,
a lower presser provided on the lower mold, configured to move together with the lower mold and movable in a direction separating and contacting the upper mold independently of the movement of the lower mold, and supporting the lower surface of the plate material; ,
It is provided on the upper mold, and is configured to move together with the upper mold and to move in a direction of separating and contacting the lower mold separately from the movement of the upper mold, and supports the upper surface of the plate member to support the upper surface of the plate material. an upper holding portion capable of sandwiching the plate material together with the lower holding portion;
An upper blade provided on the upper die, wherein an end portion of the plate material protruding from the upper pressing portion and the lower pressing portion is sandwiched between the lower pressing portion and directed downward as the upper die moves downward. an upper blade that bends into a substantially L shape,
a lower blade provided on the lower mold for bending upward an end portion of the plate material protruding from the upper blade and the lower holding portion as the upper mold moves downward; ,
A press die characterized in that the upper end surface of the lower blade has a non-contact structure that does not contact only the edge portion of the edge of the plate material. 2. The press die according to claim 1, wherein the non-contact structure is formed by chamfering an end portion of the upper end surface of the lower blade on the plate material side. 3. The press die according to claim 1 or 2, wherein the non-contact structure is formed so that the side of the upper end surface of the lower blade farther from the plate material than the plate material side has a relief shape with a lower height. The plate material is a roof panel of a vehicle, and the bending process of the substantially U-shaped cross section is performed on both side ends of the roof panel along the vehicle front-rear direction. Item 4. The press die according to any one of Items 1 to 3. 5. The press die according to any one of claims 1 to 4, wherein the plate material is made of aluminum.

Images