JP3655081B2 - Method and apparatus for squeezing metal plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for squeezing a hood frame that is a framework of, for example, a hood of an automobile.
[0002]
[Prior art]
Conventionally, to form a hood frame that will be a framework of an automobile bonnet, trunk, etc., as shown in FIG. 3, when the coil material 51 is cut into a predetermined dimension with a blanking mold, it corresponds to a model at a predetermined location at the same time. The plate material 52 with the perforated holes h is formed.
The hole h is formed so that cracks do not occur in the molded body 53 when the forming is performed in the next process. Normally, the material around the hole h is pulled during the forming of the deformation, and the shape of the hole h is deformed. While growing. When the squeezing is completed, the unnecessary portion E including the hole h is cut, and the hood frame 54 is completed.
[0003]
[Problems to be solved by the invention]
By the way, when cutting to a predetermined size with a blanking die as in the past, the method of drilling holes at a predetermined location at the same time shortens the work process and improves efficiency, but the hole position is different for each model. Since they are different, the blanking mold cannot be diverted to various models, and there is a problem that the versatility is lacking and the cost is high.
Further, there is a problem that burrs or the like are generated when punching holes, and deformation due to dust or the like is likely to occur during squeeze molding.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a drawing method according to the present invention is a method of drawing a metal plate cut to a predetermined size, and then cutting the unnecessary portion. In addition, slit processing for preventing the occurrence of cracks was performed at the same time.
[0005]
And when cutting a metal plate into a predetermined dimension, a hole is not drilled, but a slit is formed at an intended location during the squeezing process to prevent a crack from occurring at an unintended location. With such a processing method, the versatility of a mold for cutting a metal plate into a predetermined dimension is increased, and even when the model is different, it is not necessary to prepare a mold for each model, and the cost can be reduced. Since no drilling is performed prior to the squeezing process, it is possible to suppress the possibility of a deformation due to dust and the like during the squeezing process.
[0006]
Here, the slit processing is processing that forms a planned fracture portion in a predetermined portion of the metal plate, and in order to form such a fracture portion, for example, a squeezing mold with a sharp tip or the like is formed. It is made to project in the specific part of this, and it is made for a metal plate to contact a protrusion and to fracture | rupture in the middle of drawing forming. And the formation of this planned fracture portion prevents the occurrence of cracks or the like in other unintended locations.
In addition, this slit process part is cut | disconnected as an unnecessary part at the next process.
[0007]
Moreover, it is good to make it perform the said slit process with respect to the top part of the shaping | molding convex part of a metal plate.
Such a forming convex portion is a portion where a tensile force acts greatly at the time of the narrowing forming and is liable to generate a crack, and if such a portion is intentionally broken, it can be slit effectively.
[0008]
In addition, as a processing apparatus according to the present invention, a blanking mold for cutting a coil material to a predetermined size, a draw mold for squeezing a cut metal plate, and a trimming mold for cutting unnecessary parts from the squeezed molded body The molds are arranged in series along the work conveyance path, and as a draw mold, a cutting tool is projected on the bottom of the die forming recess on the die side, and on the top of the punch forming convex on the punch side, A cutting tool insertion recess was provided.
[0009]
Then, when cutting the coil material to a predetermined size with a blanking mold and squeezing it with a draw mold, at the same time slitting the molding convex part with a cutting tool, including the slit processing part as an unnecessary part with the trimming mold Disconnect.
Further, when slitting is performed with a draw tool, the die-side tool enters the punch-side tool insertion recess and does not interfere.
[0010]
At this time, it is preferable that the amount of protrusion of the cutting tool for slit processing is set to be equal to or less than the conveying surface of the metal plate, and one end side of the protruding tip of the blade is sharpened.
In this way, the protruding amount of the cutting tool is set to be equal to or less than the conveyance surface to prevent a problem that the metal plate is damaged during the conveyance of the metal plate, and the metal plate can be smoothly conveyed.
Moreover, it makes it easy to fracture | rupture a metal plate by sharpening the one end side of a protrusion front-end | tip part.
[0011]
Further, the sharpened tip of the protruding tip of the cutting tool is preferably directed in a direction in which a tensile force acts on the metal plate at the time of drawing forming.
If the direction in which the tensile force acts greatly is sharpened in this way, the contact portion is easily broken, which is convenient.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a process diagram for explaining the flow of the squeezing method according to the present invention, and FIG. 2 is an explanatory diagram for explaining slit processing by a draw mold.
[0013]
The squeezing method according to the present invention is applied to, for example, molding of a hood frame that is a framework of an automobile bonnet, trunk, etc., and is intended to generalize a blanking mold for cutting a coil material into a predetermined dimension. It is possible to suppress the occurrence of deformation due to dust and the like at the time, and is characterized by performing slit processing for preventing cracks at the same time as squeezing.
[0014]
That is, as shown in FIG. 1, the coil material 1 is cut into a plate material 2 having a predetermined size by a blanking die, and the plate material 2 is squeezed and formed by a draw type, and at the same time, slits s are processed at a predetermined location. The slits s are for preventing cracks in the product part, and the non-product part of the molded body 3 is intentionally broken.
[0015]
Here, an example of the configuration of a draw mold for performing slit processing simultaneously with the narrowing forming will be described with reference to FIG.
As shown in FIG. 2 (A), the lower die 6 of the draw mold 5 is formed with a squeeze molding concave portion 6c, and the upper die 7 is formed with a squeeze molding convex portion 7t.
[0016]
Then, a slitting blade 8 is projected from the bottom of the squeezing molding recess 6c. For example, the blade 8 is cut obliquely at the upper end of a cylindrical member and sharpened at one end, and the direction of the sharpened portion. Is a direction in which a tensile force acts greatly on the plate member 2 during squeezing.
Moreover, the front-end | tip protrusion part is made into the protrusion amount which does not jump out outside from the drawing molding recessed part 6c, and is made into below the conveyance surface of the board | plate material 2. As shown in FIG.
[0017]
A cutting tool insertion recess 9 is formed in the squeezing molding protrusion 7t. The blade insertion recess 9 is for avoiding interference with the blade 8 and is configured as a circular recess having a larger cross section than the diameter of the blade 8.
[0018]
As shown in FIG. 2 (A), the drawing molding in the draw mold 5 is performed by loading and setting the plate material 2 on the lower die 6. At this time, since the blade 8 is immersed below the conveying surface of the plate 2, there is no problem that the plate 2 is damaged.
Thereafter, as shown in FIG. 2 (B), the upper punch 7 is lowered to start squeezing molding. Then, after the plate material 2 is pressed by the squeezing molding convex part 7t and the lower surface comes into contact with the cutting tool 8, as shown in FIGS. The top of the portion 3t is partially broken. And this fracture | rupture part becomes the slit s and it can prevent that a crack generate | occur | produces in the other unintended product part etc. by formation of this slit s.
[0019]
Then, when the squeeze molding is completed as described above, as shown in FIG. 1, the unnecessary portion E including the slit s portion is cut out from the molded body 3, and the hood frame 4 is molded.
With such a processing method, there is no need to perform drilling with a blanking mold for cutting the plate material 2 from the coil material 1 as in the past, and the same blanking mold can be used regardless of the model, thus reducing costs. Figured.
In addition, since no drilling is performed before the squeezing, dust burrs due to burrs and the like are suppressed, and deformation is unlikely to occur.
[0020]
In the above embodiment, the case of forming a hood frame for an automobile has been described as an example. It is not limited.
[0021]
【The invention's effect】
As described above, in the drawing method according to the present invention, the slitting process for preventing the occurrence of cracks is simultaneously performed during the drawing process, so that the versatility of the blanking mold for cutting the metal plate into a predetermined dimension is achieved. Therefore, even if the model is different, it is not necessary to prepare a mold for each model, and the cost can be reduced.
In addition, since no drilling is performed before the squeezing process, the possibility of deformation due to dust is reduced.
Moreover, if slit processing is performed with respect to the top part of the shaping | molding convex part of a metal plate, it can slit effectively.
[0022]
Further, in a processing apparatus in which a blanking die, a draw die, and a trimming die are arranged in series along the work conveyance path, a cutting tool for slit processing is provided at the bottom of the drawing molding recess on the die side of the draw die. If a cutting tool insertion concave portion is provided at the top of the punch-side drawing forming convex portion, slitting can be performed by the cutting tool at the time of drawing forming.
[0023]
At this time, the protrusion amount of the cutting tool for slitting is set to be equal to or less than the conveying surface of the metal plate to prevent the metal plate from being damaged during the conveyance of the metal plate, and one end side of the protruding tip portion of the cutting tool is sharpened. Thus, the metal plate is easily broken.
[0024]
In addition, the sharp tip of the protruding tip of the blade can be easily broken by directing the metal plate in a direction in which a large tensile force acts on the metal plate.
[Brief description of the drawings]
FIG. 1 is a process diagram for explaining a squeezing method according to the present invention. FIG. 2 is a diagram for explaining a slit process by a draw mold. FIG. 3 is a process diagram for explaining a conventional squeezing method.
DESCRIPTION OF SYMBOLS 1 ... Coil material, 2 ... Plate material, 3 ... Molded object, 3t ... Molding convex part, 5 ... Draw metal mold, 6 ... Lower die | dye, 6c ... Squeeze molding recessed part, 7 ... Upper mold punch, 7t ... Squeezing molding convex part , 8 ... Cutting tool, 9 ... Cutting tool insertion recess, E ... Unnecessary part, s ... Slit.

Claims (3)

A metal plate squeezing method in which a metal plate cut to a predetermined size is squeezed and then unnecessary portions are cut, and a squeeze forming recess formed in a lower die of a draw mold and an upper die punch In order to prevent the occurrence of cracks during the forming of the squeezing from the squeezing molding convex part, slitting is simultaneously performed by the cutting tool provided in the squeezing molding concave part and the cutting tool insertion concave part formed in the squeezing molding convex part. The cutting tool is characterized in that the upper end of the cylindrical member is cut obliquely and one end thereof is sharpened, and the direction of the sharpened part is a direction in which a tensile force acts on the plate material at the time of squeezing. A method of squeezing a metal plate. A blanking mold that cuts the coil material to a predetermined size, a draw mold that squeezes and forms the cut metal plate, and a trimming mold that cuts unnecessary parts from the squeezed and formed body are arranged in series along the work path. The drawing mold includes a slitting blade that protrudes from the bottom of the die forming recess on the die side, and a blade formed at the top of the punch forming protrusion on the punch side. The cutting tool is provided with an insertion recess, the upper end of the cylindrical member is cut obliquely and one end side thereof is sharpened, and the direction of the sharpened part is a direction in which a large tensile force acts on the plate material during squeezing molding. Characteristic metal plate squeezing machine. 3. The metal processing apparatus according to claim 2 , wherein the protruding amount of the cutting tool for slit processing is equal to or less than a conveying surface of the metal plate, and one end side of the protruding tip portion of the cutting tool is sharpened. Plate squeezing device.

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