JP2015085385A - Press molding device and press molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press molding device which can secure chamfering accuracy irrespective of the feed accuracy of a sheet raw material, and a press molding method.SOLUTION: After trimming a corner part including the chamfering of the corner part using a movable die 6 and a trimming punch 12 without moving a sheet raw material W, a blank is formed by cutting the corner part of the sheet raw material W including the chamfering of the corner part using a fixed die 3 and a cutting punch 11. In the movable die 6, the movable die 6 is stationed at a load at the trimming of the sheet raw material W by the trimming punch 12, and at a load at the cutting of the sheet raw material W by the cutting punch 11, the movable die 6 is supported so as to be movable to a load direction.

Description

  The present invention relates to a press molding apparatus and a press molding method, and more particularly to a press cutting and trimming apparatus and a press cutting and trimming method.

  When the blank as shown in FIG. 10 is formed, the chamfer trimming h of the side edge portion of the sheet material W is performed while the sheet material W is fed in the order shown in FIGS. 11 (a) to 11 (c). There is a technique for forming a blank having chamfered corners by performing cutting i of the sheet material W later to minimize the occurrence of scraps. (For example, see Patent Document 1)

JP-A-2-34228

According to the technique of Patent Document 1, since the chamfer trimming and the cutting of the sheet material are performed at different locations, the positional accuracy of the chamfering position and the cutting position is determined by the feeding accuracy between processes of the sheet material. If a feed error occurs, the chamfering position and the cutting position are shifted, so that there is a possibility that a protrusion is formed in the chamfered portion or an error in the mutual position of the chamfering occurs. Also, R-shaped chamfering is impossible because the tip of the trimming h portion becomes too thin.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a press molding apparatus and a press molding method that can ensure chamfering accuracy regardless of the feeding accuracy of a sheet material.

  A feature of the invention according to claim 1 for solving the above-described problem is that the cutting die and the trimming punch, a pressing die for moving the fixed die and the movable die in proximity, and a sheet feeding unit for feeding a sheet material are provided, and the fixed die In the press forming apparatus for forming a blank from the sheet material by cutting the sheet material using the cutting punch and trimming using the movable die and the trimming punch, the proximity of the cutting punch to the movable die The cutting punch and the trimming punch are held together so that the distance in the displacement direction is greater than the distance in the proximity displacement direction of the trimming punch with respect to the movable die. Die, the trimming punch trims the sheet material The movable die is provided with a movable die support means for supporting the movable die so as to move in the proximity displacement direction under a load when the cutting punch cuts the sheet material. It is.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the trimming punch performs trimming including chamfering at least the corner of the blank, and the cutting punch performs cutting including chamfering of the corner. Is to do.

  A feature of the invention according to claim 3 is that a blank is formed from a sheet material using the press molding apparatus according to claim 1 or claim 2.

  According to the invention according to claim 1, when the punch and the die are displaced in proximity, the sheet material is first trimmed by the trimming punch and the movable die, and then the fixed die and the cutting are performed without feeding the sheet material. The sheet material is cut by the punch. For this reason, since trimming and cutting can be simultaneously performed on the same blank in a single process, the press molding process can be shortened and the press molding apparatus can be downsized. Further, since trimming and cutting can be performed simultaneously without feeding the sheet material, the trimming shape and the position error of the cut surface due to the sheet material feeding error do not occur.

  According to the invention which concerns on Claim 2, since all the chamfering can be shape | molded, without sending a sheet | seat raw material, the press molding apparatus which does not generate | occur | produce the position error of a chamfering part is realizable.

  According to the invention of claim 3, when the punch and the die are displaced in proximity, the sheet material is first trimmed by the trimming punch and the movable die, and then the sheet material is cut by the fixed die and the cutting punch. Done. For this reason, since a blank can be shape | molded by performing trimming and a cutting | disconnection simultaneously with respect to the same blank in one process, a press molding process can be shortened. Further, since all the chamfers can be formed without feeding the sheet material, it is possible to realize a press forming method in which no position error of the chamfered portion occurs.

  According to the present invention, it is possible to provide a press molding apparatus and a press molding method that can ensure chamfering accuracy regardless of the sheet material feeding accuracy.

It is sectional drawing (CC cross section of FIG. 3) of the press molding apparatus in embodiment of this invention. It is an AA arrow line view of FIG. It is a BB cross-sectional arrow view of FIG. It is a figure which shows the insertion state of the sheet raw material of a press process. It is a figure which shows the trimming completion state of a press process. It is a figure which shows the cutting completion state of a press process. It is a figure which shows the blank carrying-out of a press process, and the insertion state of a sheet raw material. It is a figure which shows the blank shape of other embodiment. It is a figure which shows the insertion state of the sheet raw material of the press process of other embodiment. It is a figure which shows a blank shape. It is a figure which shows the conventional press process.

An embodiment of the present invention will be described.
A press molding apparatus 1 shown in FIG. 1 includes a base 2, and a fixed die 3 and a first guide pin 4 are fixed to the upper surface of the base 2. The first guide pin 4 is inserted into the fitting hole 6a of the movable die 6 and guides the movable die 6 in a slidable manner. A spring 5 is disposed in a compressed state on the outer periphery of the first guide pin 4 between the upper surface of the base 2 and the lower surface of the movable die 6. Thereby, the movable die 6 is pressed against the flange portion 4a of the first guide pin 4 with a predetermined force by the spring 5 (movable die support means). In this state, the upper surface of the fixed die 3 and the upper surface of the movable die 6 are coplanar, and the sheet material W is held flat.
As shown in FIG. 2, the first guide pins 4 are arranged at three locations.

  Furthermore, the press molding apparatus 1 includes an upper mold base 7 that is opposed to the base 2 and is supported so as to be movable in the sliding direction of the movable die 6 by pressing means (not shown). A cutting punch 11, a trimming punch 12, and a second guide pin 8 are fixed to the lower surface of the upper mold base 7. The second guide pin 8 is inserted into the fitting hole of the presser plate 10 and guides the presser plate 10 to be slidable. A spring 9 is disposed in a compressed state on the outer periphery of the second guide pin 8 between the lower surface of the upper mold base 7 and the upper surface of the presser plate 10. Thereby, the presser plate 10 is pressed against the flange portion of the second guide pin 8 by the spring 9. In this state, the gaps between the lower surfaces of the presser plate 10, the cutting punch 11, and the trimming punch 12 and the upper surface of the sheet material W are as follows. The gap between the holding plate 10 and the upper surface of the sheet material W is the smallest, and then the gap between the lower surface of the trimming punch 12 and the upper surface of the sheet material W is large. The gap between the lower surface of the cutting punch 11 and the upper surface of the sheet material W is maximized, and the gap is larger than the gap between the lower surface of the trimming punch 12 and the upper surface of the sheet material W by an amount larger than the thickness of the sheet material W.

  As shown in FIG. 3, the cutting edge 11 a of the cutting punch 11 has a shape in which a rectangular end portion is chamfered, and moves up and down along the end surface of the fixed die 3. The pair of trimming punches 12 are disposed at two corners of the sheet material W, and the cutting edge 12 a of the trimming punch 12 moves up and down along the end face of the movable die 6.

A blank forming process will be described with reference to FIGS.
First, as shown in FIG. 4B, the upper die base 7 is positioned at the rising end, and the press plate 10, the cutting punch 11, and the trimming punch 12 are separated from the fixed die 3 and the movable die 6. The sheet material W is fed to the press forming position by a sheet feeding means (not shown).

  As shown in FIG. 5B, the trimming punch 12 trims the tip corner of the sheet material W while the upper die base 7 is lowered and the presser plate 10 presses the sheet material W against the fixed die 3. While descending. At this time, since the force by which the movable die 6 is pressed against the flange portion 4a of the first guide pin 4 by the spring 5 is set larger than the force acting on the movable die 6 by trimming, the movable die 6 is stationary. doing. As a result, when the trimming punch 12 reaches the position of the upper surface of the movable die 6, as shown in FIG. 5A, the leading end corner of the sheet material W is removed as a punched residue Wk to form a chamfer e. .

  When the upper die base 7 continues to descend and the cutting punch 11 comes into contact with the upper surface of the sheet material W, a force greater than the force by which the movable die 6 is pressed against the flange portion 4 a of the first guide pin 4 by the spring 5 is applied to the movable die 6. The movable die 6 moves down together with the cutting punch 11. Therefore, as shown in FIG. 6B, the sheet material W is cut between the fixed die 3 and the cutting punch 11 to form a blank Wb. The cut shape is a shape provided with chamfers at both corners of the blank Wb as shown in FIG.

  Next, after the upper mold base 7 is raised and the blank Wb is unloaded by unillustrated unloading means, as shown in FIG. 7B, the sheet material W is fed and the next blank formation is started. .

  As described above, one lowering of the upper mold base 7 can simultaneously perform chamfering trimming and cutting including chamfering on the same blank, so that the press molding process can be shortened and the press molding apparatus can be downsized. . Further, since the chamfering can be formed with the same mold in which the cutting punch 11 and the trimming punch 12 are integrated, the mutual positional accuracy of the chamfering is not affected by the feeding error of the sheet material W.

In the above embodiment, the trimming is only chamfering, but trimming of other shapes such as g shown in FIG. 8 may be added. In this case, as shown in FIG. 9, a trimming punch 13 for trimming the g portion is added. The gap between the presser plate 10 and the lower surface of each punch from the upper surface of the sheet material W is the minimum for the presser plate 10, then the trimming punch 13, then the trimming punch 12, and the cutting punch 11 at the maximum. By doing so, it is possible to first trim the g portion, then trim the chamfer, and finally cut. Since the trimming process is performed twice, the force acting on the movable die 6 can be reduced.
Further, although the spring is used as the movable die support means, a fluid cylinder that presses with a constant pressure may be used.

W: Sheet material Wb: Blank 1: Press molding device 2: Base 3: Fixed die 4: First guide pin 5: Spring 6: Movable die 7: Upper die base 8: Second guide pin 9: Spring 10: Presser plate 11: Cutting punch 12, 13: Trimming punch

Claims (3)

A pressing means for displacing the cutting punch and the trimming punch, the fixed die and the movable die, and
A sheet feeding means for feeding the sheet material;
In the press molding apparatus for molding a blank from the sheet material by cutting the sheet material using the fixed die and the cutting punch and trimming using the movable die and the trimming punch,
The distance between the cutting punch and the movable die in the proximity displacement direction is greater than the distance of the trimming punch relative to the movable die in the proximity displacement direction and is greater than the thickness of the sheet material. The trimming punch is held as one piece,
The movable die is stationary at a load when the trimming punch trims the sheet material, and the movable die is moved in the proximity displacement direction at a load when the cutting punch cuts the sheet material. A press molding apparatus comprising movable die support means for supporting movement.   The press molding apparatus according to claim 1, wherein the trimming punch performs trimming including chamfering of at least the corner of the blank, and the cutting punch performs cutting including chamfering of the corner.   A press molding method for molding a blank from a sheet material using the press molding apparatus according to claim 1.

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