JP3758145B2 - Trimming type with scrap cutting blade - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a trimming die for trim processing, and more particularly to a trimming die with a scrap cutting blade provided with an upper scrap cutting blade and a lower scrap cutting blade for cutting a scrap portion of a workpiece.
[0002]
[Prior art]
In general, in press molding of car body skins (doors, ceilings, bonnets, trunks, etc.) and various skins (hereinafter referred to as workpieces), after the workpieces have been primary molded, unnecessary scrap parts are cut off and the secondary molding process To supply. The trimming die for cutting off the scrap part consists of an upper blade attached to the upper die (punch holder) and a lower blade attached to the lower die (die). The scrap part is cut off from the work in a frame-like or frame-like state by meshing, but the frame-like or frame-like scrap part is inconvenient to handle and has a drawback of requiring a large accumulation space.
[0003]
Therefore, an upper scrap cutting blade and a lower scrap cutting blade are provided on the upper blade and the lower blade, respectively, and an incision for cutting is formed in the scrap portion by meshing with the upper scrap cutting blade and the lower scrap cutting blade, followed by trimming. "Trimming type with scrap cutting blades" (Japanese Utility Model Publication No. 62-22268) is proposed.
FIG. 7 shows the structure of such a trimming die with a scrap cutting blade, FIG. 7 (a) is a detailed perspective sectional view of the main part, and FIGS. 7 (b) and 7 (c) are side views of FIG. 7 (a). . As shown in FIGS. 7A to 7C, an upper trimming blade 111b having a leading blade 111a is provided on the upper blade 111 of the trimming die 110, and upper scrap cutting is performed so as to intersect the leading blade 111a at a right angle. A blade 111c is provided. The lower blade 112 is provided with a lower trimming blade 112b and a lower scrap cutting blade 112c corresponding to the upper trimming blade 111b and the upper scrap cutting blade 111c. The upper end surface 112d of the lower scrap cutting blade 112c is positioned below the blade surface of the lower blade 112 in order to obtain a meshing stroke between the upper trimming blade 111b and the lower trimming blade 112c. A cutout portion 112e for burr relief is provided at the root of the end surface 112d. In addition, a constant shear angle is set in the leading blade 111a along the blade direction.
When L-shaped cutting is performed by the upper scrap cutting blade 111c that is perpendicular to the starting end of the leading blade 111a, the leading blade 111a immediately engages with the lower trimming blade 112b, but the upper scraping surface 112d of the lower scrap cutting blade 112c Since there is no blade corresponding to the leading blade 111a, the scrap portion S is slightly cut in the direction of the upper scrap cutting blade 111c by the pressing force of the upper scrap cutting blade 111c and the tension acting on the scrap portion S.
Such a form of division is called “aerial cut”, and the cut along the upper end surface 112d of the lower scrap cutting blade 112c is torn off to form a burr. The burr generated on the root side of the flank escapes to the lower cutout portion 112e, escapes shearing, and is cut off integrally with the scrap portion S.
[0004]
[Problems to be solved by the invention]
As described above, if the burr on the scrap part side is missed in the notch and the subsequent shearing is prevented, adhesion of the burr of the scrap to the work caused during the air cut is prevented. However, depending on the state of tearing during aerial cutting, the workpiece may be slightly misaligned or cut into the workpiece depending on the direction and magnitude of the component force acting on the workpiece.
In addition, when the cutout portion is provided, stress concentrates on the cutout portion, and thus an expensive metal material is inevitably used to obtain a required strength.
This invention is made in view of the said situation, The objective is to enable it to form a notch in a scrap part irrespective of aerial cutting.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, an upper scrap cutting blade and a lower scrap cutting blade for forming a cut for cutting in the scrap portion of the work prior to the trimming of the work are attached to the upper die and the lower die of the trimming die. In the trimming die with scrap cutting blade, the upper scrap cutting blade is attached to the outer portion of the upper die, and the lower scrap cutting blade is attached to the upper surface of the pedestal protruding to the outer portion of the lower die, The lower scrap cutting blade is divided into a first blade portion and a second blade portion, and the first blade portion is movable up and down in a guide groove provided on one side surface of the second blade portion, and The first blade portion is slidably engaged to form the first blade portion of the lower scrap cutting blade and the blade surface of the second blade portion following the lower surface of the scrap portion. Elevating through an elastic body Is supported on the stationary, the blade surface is brought into contact with the lower surface of the scrap portion is moved upward the lower scrap cutting blade by the urging force of the elastic body, said first blade of said lower scrap cutting blade The first scrap of the upper scrap cutting blade and the lower scrap cutting blade in a state where the lower surface of the scrap portion is supported across the entire width of the scrap portion by the blade surface of the portion and the second blade portion . The present invention provides a trimming die with a scrap cutting blade, characterized in that the cut portion is formed in the scrap portion by the blade portion and the second blade portion .
With this configuration, since the scrap part of the workpiece is supported by the lower scrap cutting blade and is cut by the upper scrap cutting blade and the lower scrap cutting blade, it is possible to prevent the occurrence of burrs and the progress of cutting to the workpiece side. Therefore, it is possible to prevent the workpiece from being displaced. For this reason, the trimming processing accuracy can be improved and traces of the workpiece surface due to burrs can be eliminated.
[0006]
Furthermore, the invention according to claim 2 provides a trimming die with a scrap cutting blade that is set so that an initial set load of the elastic body can cut the scrap portion.
If it does in this way, mutual interference with a lower scrap parting blade and an upper scrap parting blade is prevented, and since an upper scrap parting blade and a lower scrap parting blade are protected, reliability and durability improve.
[0007]
In the first and second aspects of the invention, the lower scrap cutting blade is divided into a plurality of pieces in advance based on the shape of the scrap portion, and each of the divided portions is supported so as to be movable up and down via an elastic body. May be. In this case, only the division part on the trimming line side of the lower scrap cutting blade may be freely raised and lowered via the elastic body. If it does in this way, shaping of a blade face will become easy and maintenance nature will improve.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a trimming die with a scrap cutting blade according to the present invention will be described with reference to the accompanying drawings.
[0009]
FIG. 1 is an overall configuration diagram of a trimming die with a scrap cutting blade according to the present embodiment. On the outer side of the upper mold 2 and the lower mold 3 of the trimming mold 1, an upper blade 4 and a lower blade 5 for cutting off a scrap portion S of a workpiece (primary molded product; draw molded product) W are provided. Prior to trimming W, upper scrap cutting blades 6... And lower scrap cutting blades 7... For forming cuts for cutting in the scrap portion S of the workpiece W are provided. The upper scrap cutting blades 6 are attached to the outer side of the upper die 2, and the lower scrap cutting blades 7 are attached to the upper surface of the base 8 protruding outward from the outer side of the lower die 3. The upper scrap cutting blades 6 ... face the scrap part S of the workpiece W placed on the lower mold 3 downward, and the lower scrap cutting blades 7 ... face the scrap part S of the workpiece W upward. It is out.
[0010]
FIG. 2 is a perspective view showing how the upper scrap cutting blade 6 and the lower scrap cutting blade 7 are attached, and FIG. 3 is an exploded perspective view showing the configuration of the lower scrap cutting blade 7. As shown in FIGS. 2 and 3, the upper scrap cutting blade 6 is formed by a first blade portion 6a for forming a cut in the scrap portion S of the work W and the first blade portion 6a. A second blade 6b is provided as a final cut by further extending the cut in the transverse direction of the scrap portion S. Similarly, the lower scrap cutting blade 7 is formed with a cut in the scrap portion S of the workpiece W. And a second blade portion 7b for further extending the incision formed by the first blade portion 7a in the transverse direction of the scrap portion S as a final incision. .
The first scraper blade 6a and the second scraper blade 6b of the upper scrap cutting blade 6 are formed integrally with each other, and the lower scrap cutting blade 7 includes the first blade portion 7a and the second blade portion 7b. The lower surface of the scrap portion S is supported by the blade surface. The first blade portion 7a of the lower scrap cutting blade 7 is slidably movable in a vertical linear guide groove 7c provided on one side surface of the second blade portion 7b of the lower scrap cutting blade 7. Engage freely. The first blade portion 7a of the lower scrap cutting blade 7 is provided with a vertically long hole 7d at a portion facing the linear guide groove 7c, and the length and length of the seat plate (washer) 9 are long. The bolt 10 inserted into the hole 7d is screwed into a screw hole 7e (see FIG. 3) formed at the bottom of the linear guide groove 7c.
As shown in FIG. 3, the tip of the bolt 10 is a screw portion 10a having a reduced diameter with respect to the base of the bolt 10, and is configured to be screwed into the screw hole 7e. The length of the base portion of the bolt 10 is slightly larger than the sum of the thickness of the seat plate 9 and the wall pressure of the first blade portion 7a of the lower scrap cutting blade 7. Therefore, when the bolt 10 is fastened to the screw hole 7e as shown in FIG. 2, a slight clearance is formed between the first blade portion 7a and the groove bottom of the linear guide groove 7c. Thus, the first blade portion 7a can be raised and lowered.
[0011]
The blade surfaces of the first blade portion 7a and the second blade portion 7b of the lower scrap cutting blade 7 are scraped in order to support the lower surface of the scrap portion S across the entire width in the transverse direction of the scrap portion S. The elastic body 11 is interposed between the lower surface of the first blade portion 7 a of the lower scrap cutting blade 7 and the upper surface of the pedestal 8.
The elastic body 11 is composed of a rubber such as urethane rubber or chloroprene rubber having a predetermined rubber hardness and a predetermined rubber elasticity, a spring such as a compression coil spring or a leaf spring, or a composite part thereof ( In the example shown in the figure, a compression coil spring), and the biasing force thereof moves the first blade portion 7a of the lower scrap cutting blade 7 upward so that the blade surface comes into contact with the lower surface of the scrap portion S. In this state, the scrap portion S Has come to support. The initial set load (set force) of the elastic body 11 supports the lower surface of the scrap portion S by the first blade portion 7a of the lower scrap cutting blade 7 and the first blade portion 6a of the upper scrap cutting blade 6. However, in this state, the scrap portion S is set so as to be able to form a cut in the transverse direction, and the first blade portion 6a of the upper scrap cutting blade 6 and the first blade portion 7a of the lower scrap cutting blade 7 are engaged with each other. Is set so that a cut can be formed in the scrap portion S by the second blade portion 6b of the upper scrap cutting blade 6 and the second blade portion 7b of the lower scrap cutting blade 7.
As described above, when the initial set load of the elastic body 11 is determined, when the entire scrap portion S is separated from the workpiece W by the upper die 2 and the lower die 3, the first blade portion of the upper scrap cutting blade 6. Since mutual interference between 6a and the first blade portion 7a of the lower scrap cutting blade 7 is prevented, damage due to the interference is prevented.
[0012]
2 and 3, the first blade portion 7a of the lower scrap cutting blade 7 is provided with a hook-like stop portion 7f at the lower portion in order to regulate the maximum rising position by the elastic body 11. At the lower portion of the second blade portion 7b of the lower scrap cutting blade 7, a stop surface portion 7g for restricting the hook-shaped stopper 7f described above to the maximum ascending position is provided. Further, as shown in FIG. 3, a guide portion 7 h for guiding a compression coil spring as the elastic body 11 is provided on the lower surface of the first blade portion 7 a of the lower scrap cutting blade 7. Furthermore, on the upper surface of the second blade portion 7b of the lower scrap cutting blade 7, an engaging portion 7i for engaging the protruding strip portion S1 formed on the scrap portion S for positioning the workpiece W is provided. .
[0013]
Next, the trimming process of the workpiece W by the trimming die 1 will be described with reference to FIGS. 1, 4, 5, and 6. FIG.
As shown in FIG. 1, the workpiece W is placed on the lower mold 3, and the convex strip S <b> 1 of the scrap portion S is engaged with the engaging portion 7 i of the lower scrap cutting blade 7 to complete the setting of the workpiece W. Subsequently, the upper mold 2 is lowered to the lower mold 3 side. When the upper scrap cutting blade 6 is lowered integrally with the upper mold 2, as shown in FIG. 4, the first blade portion 6a of the upper scrap cutting blade 6 and the first blade portion 7a of the lower scrap cutting blade 7 Thus, a cut C1 is formed. The cut C1 extends in the transverse direction of the scrap portion S as the upper scrap cutting blade 6 descends. When the lowering of the upper die 2 proceeds and the incision by the first blade portion 6a of the upper scrap cutting blade 6 and the first blade portion 7b of the lower scrap cutting blade 7 is completed, the second scrap of the upper scrap cutting blade 6 is then performed. The cutting edge 6b and the second cutting edge 7b of the lower scrap cutting blade 7 are cut in the transverse direction of the scrap portion S so that the upper cutting edge 4 of the upper die 2 and the lower cutting edge 5 of the lower die 3 form the workpiece W. When contacting a trimming line (not shown), a final cut C2 is formed (see FIG. 6A → FIG. 6B).
At this time, mutual interference between the first blade portion 6 a of the upper scrap cutting blade 6 and the first blade portion 7 a of the lower scrap cutting blade 7 is prevented by the buffering action of the elastic body 11.
After the cutting is completed by the second blade portion 6b of the upper scrap cutting blade 6 and the second blade portion 7b of the lower scrap cutting blade 7, the upper blade 4 and the lower blade 5 are engaged as shown in FIG. Thus, the scrap part S is cut off (see FIG. 6C → FIG. 6D).
[0014]
As described above, according to the trimming die 1 according to the embodiment of the present invention, unlike the conventional aerial cut in which the scrap portion S is cut and the cut is formed, the scrap portion is formed on the blade surface of the lower scrap cutting blade 7. Since S is supported and this state is maintained and a cut is formed, there is no occurrence of displacement of the workpiece W or cut into the workpiece. Moreover, since the formation of burrs is prevented and the generation of chips due to the burrs is also prevented, the generation of traces due to the chips in the next molding step can be prevented.
[0015]
In the description of the present embodiment, in order to cope with the complicated shape of the scrap portion S, the first blade portion 7a of the lower scrap cutting blade 7 is placed on one side surface of the second blade portion 7b with the elastic body 11. However, the second blade portion 7b of the lower scrap cutting blade 7 may also be movable up and down via the elastic body 11. Of course, when the shape of the scrap part S is simple and it is not necessary to divide the lower scrap cutting blade 7 into a plurality of parts, the blade surface of the lower scrap cutting blade 7 is formed to follow the lower surface of the scrap part S, and the lower scrap cutting is performed. The entire blade 7 may be supported through the elastic body 11 so as to be movable up and down. In this way, an inexpensive trimming die 1 can be obtained.
[0016]
In the description of the embodiment of the present invention, the second scraper blade 7b of the lower scrap cutting blade 7 is provided to be raised and lowered via the elastic body 11, but the lower scrap cutting blade 7 as a whole is described. As an alternative, the upper scrap cutting blade 6 may be moved up and down via the elastic body 11 instead. In this case, similarly to the lower scrap cutting blade 7, the first blade portion 6 a may be raised and lowered via the elastic body 11 with respect to the second blade portion 6 b of the upper scrap cutting blade 6. Further, the blade surface of the upper scrap cutting blade 6 may be formed following the upper surface of the scrap portion S.
[0017]
【The invention's effect】
As is apparent from the above description, the present invention exhibits the following excellent effects.
According to the first aspect of the present invention, unlike the conventional aerial cut in which the scrap portion is cut to form a cut, the upper scrap cutting blade and the lower scrap are supported with the scrap portion supported by the blade surface of the lower scrap cutting blade. Since the notch is formed in the scrap portion by cutting with the cutting blade, it is possible to prevent the position shift of the workpiece caused by the tearing and the progress of the incision to the workpiece side. Moreover, since the formation of burrs is prevented and the generation of chips due to burrs is prevented, the generation of traces due to the adhesion of chips in the next molding step can be prevented. Furthermore, since the notch part for missing a burr | flash is not required, the intensity | strength of a lower scrap parting blade can be improved substantially.
According to the invention described in claim 2, since mutual interference between the lower scrap cutting blade and the upper scrap cutting blade is prevented, the reliability and durability of the upper scrap cutting blade and the lower scrap cutting blade are improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a trimming die with a scrap cutting blade according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an upper scrap cutting blade and a lower scrap cutting blade according to an embodiment of the present invention.
FIG. 3 is an exploded perspective view showing a configuration of a lower scrap cutting blade according to an embodiment of the present invention.
FIG. 4 is a perspective view of a workpiece trimming process according to an embodiment of the present invention, and is an explanatory perspective view showing a state where a cut is formed in a scrap portion.
FIG. 5 is a perspective view of a workpiece trimming process according to an embodiment of the present invention, and is a perspective view showing a state in which a scrap portion is cut off by trimming.
6A is a plan view of a workpiece trimming process according to an embodiment of the present invention, FIG. 6A is a plan view showing a state before trimming, and FIG. 6B is a cut portion formed in a scrap portion; FIG. 6C is a plan view showing a state where the scrap part is separated from the work by trimming, and FIG. 6D is a plan view showing a state where the scrap part is separated from the work.
7 shows the structure of a conventional trimming die with a scrap cutting blade, FIG. 7 (a) is a detailed perspective sectional view of the main part, and FIGS. 7 (b) and 7 (c) are side views of FIG. 7 (a). It is.
[Explanation of symbols]
2 Upper die 3 Lower die 6 Upper scrap cutting blade 7 Lower scrap cutting blade 11 Elastic body C1 Cutting W Work S Scrap part

Claims (2)

In a trimming die with scrap cutting blades, in which an upper scrap cutting blade and a lower scrap cutting blade are formed on the upper die and lower die of the trimming die to form a notch for cutting in the scrap portion of the workpiece prior to workpiece trimming. ,
The upper scrap cutting blade is attached to the outer portion of the upper mold, and the lower scrap cutting blade is attached to the upper surface of the pedestal protruding to the outer portion of the lower mold,
The lower scrap cutting blade is divided into a first blade portion and a second blade portion, and the first blade portion can be raised and lowered freely in a guide groove provided on one side surface of the second blade portion. And slidably engaged,
The first blade portion of the lower scrap cutting blade and the blade surface of the second blade portion are formed to follow the lower surface of the scrap portion, and the first blade portion can be raised and lowered via an elastic body. The lower scrap cutting blade is moved upward by the urging force of the elastic body, and the blade surface is brought into contact with the lower surface of the scrap portion, whereby the first blade portion of the lower scrap cutting blade said first blade of said upper scrap cutting blade and the lower scrap cutting blade in a state in which said lower surface of said scrap portion in the blade surface of the second blade portion to and supported span the entire width in the transverse direction of the scrap portion and A trimming die with a scrap cutting blade, characterized in that the cut is formed in the scrap portion by the portion and the second blade portion .  The trimming die with a scrap cutting blade according to claim 1, wherein an initial set load of the elastic body is determined so as to enable cutting of the scrap portion.

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