JP3798094B2 - Mold used for bending plate material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal mold used in a plate material bending method for forming a three-dimensional curved surface on a plate material.
[0002]
[Prior art]
Conventionally, as a mold used for processing a three-dimensional curved surface on a plate material by, for example, a press brake, a punch and die are made of metal, and a three-dimensional curved surface mold is used to mold the plate material. It is common.
[0003]
[Problems to be solved by the invention]
By the way, the conventional mold for forming a three-dimensional curved surface described above has a problem that wrinkles are generated in the product forming process because the curved surface is processed. In order to prevent the generation of wrinkles, it is necessary to keep the machining accuracy high. In some cases, accessory parts such as a plate retainer are required, the mold becomes large, the weight is heavy, and the delivery time is increased. There was a problem that the processing cost was high. In addition, there is a problem that a dedicated die that matches the product shape is required.
[0004]
An object of the present invention is to provide a mold for use in a bending method of a plate material that uses an elastic body that is freely deformed in a mold and is formed into a three-dimensional curved surface to prevent wrinkles and improve processing accuracy. is there.
[0007]
[ Means for Solving the Problems ]
The mold of the present invention according to claim 1 is provided with a projecting portion projecting downward in a predetermined range of a substantially central portion in the longitudinal direction of the upper mold on the lower surface of the upper mold, and the projecting portion of the upper mold An R-bending upper mold of a high-hardness elastic body formed in a two-dimensional R shape at the lower part of the upper mold is provided with substantially the same length in the longitudinal direction of the upper mold, and the R-hardness elastic body R is formed on the upper surface of the lower mold. A lower bending mold is provided.
[0008]
Therefore, since the R-bending upper mold of the high-hardness elastic body and the R-bending lower mold of the low-hardness elastic body that deforms into almost the same shape in response to the deformation of the R-bending upper mold, the plate material In addition, a three-dimensional curved surface can be easily formed, cost can be reduced by a simple component, and a long product can be bent without a joint flaw. Further, it is possible to correct the flat plate by bending the warped plate material in the opposite direction, and further, by adjusting the deformation amount of the upper mold on the R-bending and changing the feed pitch amount, the same R A bent product with a high processing accuracy in which the R shape is changed by a bending die can be processed.
[0009]
A mold according to a second aspect of the present invention is the mold according to the first aspect , wherein the upper surface of the lower R-bending mold has a two-dimensional R substantially the same as the two-dimensional R shape formed on the upper R-bending mold. It is formed in a shape.
[0010]
Therefore, since the upper surface of the lower R-bending die is formed in the same R shape as the two-dimensional R shape formed in the upper R-bending die, the R-bending accuracy of the plate material can be improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, although it demonstrates for a press brake as a board | plate bending machine, it is not limited to this model, Moreover, since a press brake is already a thing of a well-known structure, detailed illustration and description are abbreviate | omitted.
[0012]
Referring to FIGS. 1 and 2, the press brake 1 is provided with a lower table 3 that is moved up and down by a hydraulic cylinder or the like at the lower part of the machine body, and a lower mold 5 is provided above the lower table 3. The lower mold 5 is provided with an R-bending lower mold 7.
[0013]
An upper mold 11 is provided at the lower end of the upper table 9 that hangs down from the upper part of the machine body, and an R-bending upper mold 13 is attached to the lower part of the upper mold 11. The plate material W is bent by the cooperation of the mold 13 and the R-bend lower mold 7.
[0014]
The upper mold 11 and the R-bending upper mold 13 attached to the upper mold will be described in more detail.
[0015]
On the lower surface of the upper mold 11 provided at the lower end of the upper table 9, as shown in FIG. 2, a protrusion having a predetermined width that hangs downward at substantially the center in the longitudinal direction of the upper mold 11. 15 is formed, and the lower surface of the protrusion 15 is a flat surface 17.
[0016]
Although the upper mold 11 is not shown in the figure but is joined to the upper bent mold 13 by an appropriate connecting member (for example, a bolt or the like), the upper surface of the R-bending upper mold 13 that comes into contact with the protruding portion 15 is a flat surface 19. A gap 21 is formed on both sides of the projecting portion 15 with the upper mold 11, and a predetermined two-dimensional R shape 23 is formed on the lower surface of the R-bending upper mold 13. The R-bending upper mold 13 is made of a high hardness elastic body HP (for example, synthetic rubber or synthetic resin).
[0017]
The R-bending lower mold 7 attached to the lower mold 5 will be described in more detail.
[0018]
As shown in FIG. 1, a two-dimensional R-shape 25 that is substantially the same as the two-dimensional R-shape 23 formed on the R-bending upper die 13 is formed on the upper surface of the R-bending lower die 7. It is plate-shaped and is mounted in a stepped groove 27 formed in the lower mold 5. Reference numeral 29 denotes a gap. Further, the lower R-bending mold 7 is made of a low-hardness elastic body LP (for example, synthetic rubber or synthetic resin). Although the two-dimensional R shape 25 is formed on the upper surface of the lower R-bending mold 7, the upper surface of the lower R-bending mold 7 may be flat.
[0019]
With the configuration as described above, the operation is as shown in FIG. 3, in which the plate material W is preliminarily processed into a two-dimensional R-bend in a circular shape using a separate mold in the first step, and then processed into this circular arc shape. The formed plate material W is placed on the lower R-shaped mold 7.
[0020]
When the lower table 3 is raised by a cylinder (not shown) or the like, a force is applied to the lower mold 5 in the direction of the arrow shown in FIG. The R-bending upper mold 13 is deformed as shown by a dotted line in the drawing of FIG. Therefore, the plate material W can be bent to produce a bent product W _s with good processing accuracy as shown in FIG. The product W _s shown in FIG. 4 is bent at a predetermined radius R2 in a direction orthogonal to the two-dimensional R-bending direction of the plate material W bent at a predetermined radius R1 in the first step. It can be molded.
[0021]
Further, since the R-bending upper mold 13 is made of a high-hardness elastic body HP and the R-bending lower mold 7 is made of a low-hardness elastic body LP, the two-dimensional R shape formed on the R-bending upper mold 13 is used. Since the R-bending lower die 7 is deformed following 23, an easily and accurately bent shape can be formed. Furthermore, it is possible to process a bent product W _s having a high processing accuracy in which the R shape is changed in the same die by adjusting the deformation amount of the upper R-bending die 13 and changing the feed pitch amount. .
[0022]
Next, in the case of bending a long plate material W having a small lateral width in the longitudinal direction of the upper mold 11 and the lower mold 5 to be used and having a length equal to or longer than the mold length, the bending is performed in the manner shown in FIGS. Processing is performed. First, as shown in FIG. 5, the first bending process is performed. Next, as shown in FIG. 6, the plate material W is fed leftward and the next bending process is performed. In this manner, the processing as shown in FIG. 6 is performed from the state of FIG. 5, and this operation is repeated and divided into a plurality of processes, so that the plate material W can be obtained even if the lateral width in the longitudinal direction of the upper mold 11 to be used is small. Can be bent to a long plate W with good processing accuracy.
[0023]
Therefore, a bent product W _s without a seam is obtained, and a long bent product W _s longer than the mold length can be processed.
[0024]
Further, as shown in FIG. 7 to FIG. 9, it is possible to correct the warp generated by processing when the plate material W is processed into an arc shape in advance by using another mold in the first step. That is, the flat plate material W shown in FIG. 7 is warped in the longitudinal direction as shown in FIG. 8 when the arc shape is subjected to two-dimensional R-bending using another mold in the first step. Will occur. The warped plate material W is inserted between the R-bending upper die 13 and the R-bending lower die 7 described in the example of the present embodiment, and the R-bending upper die 13 and the R-bending lower die are inserted. By pressing in the opposite direction against the warp in cooperation with 7, the warp of the plate material W can be corrected as shown in FIG.
[0025]
In addition, this invention is not limited to the embodiment of the invention described above, and can be implemented in other modes by making appropriate changes.
[0026]
【The invention's effect】
As can be understood from the description of the example of the embodiment as described above, according to the present invention, the R-bending upper mold of the high hardness elastic body and the deformation of the R-bending upper mold are almost the same shape. Because it is a combination of deformed low-hardness elastic R-curved lower molds, it is possible to easily form a three-dimensional curved surface on the plate material, and the cost is reduced by simple components, and there is no joint damage. The product can be bent. In addition, it is possible to correct the flat plate by bending the warped plate material in the opposite direction, and further, by adjusting the amount of deformation of the R-bending upper die and changing the feed pitch amount, it is the same A bent product with a high processing accuracy in which the R shape is changed by the R bending die can be processed.
[0028]
Further, according to the present invention, since the upper surface of the R bending lower die substantially the same R shape as the two-dimensional R-shape formed in the upper mold R bend is formed, the improvement of R bending accuracy of the sheet material Can be planned.
[Brief description of the drawings]
FIG. 1 is a side view of upper and lower molds showing a main part of the present invention.
FIG. 2 is a front view of FIG.
FIG. 3 is an operation explanatory diagram.
FIG. 4 is a perspective view showing a product.
FIG. 5 is an operation explanatory view for processing a long material.
FIG. 6 is an explanatory diagram of an action of processing a long material.
FIG. 7 is a perspective view showing a flat plate material.
FIG. 8 is a perspective view showing warpage appearing on a plate material after bending.
FIG. 9 is a perspective view showing a plate material after warping correction.
[Explanation of symbols]
5 Lower die 7 R-bending lower die 11 Upper die 13 R-bending upper die 15 Protruding portions 23, 25 Two-dimensional R-shaped W Plate material HP High hardness elastic body LP Low hardness elastic body

Claims (2)

  On the lower surface of the upper mold, a projecting portion projecting downward is provided in a predetermined range substantially in the center in the longitudinal direction of the upper mold, and a two-dimensional R shape is formed below the projecting portion of the upper mold. An R-bending upper mold of a high-hardness elastic body is provided in substantially the same length in the longitudinal direction of the upper mold, and an R-bending lower mold of a low-hardness elastic body is provided on the upper surface of the lower mold. Mold. 2. The mold according to claim 1 , wherein an upper surface of the lower R-bending mold is formed in a two-dimensional R shape substantially the same as the two-dimensional R shape formed in the upper R-bending mold.

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