JPH08267155A - Trimming method and device therefor - Google Patents

Abstract

PURPOSE: To surely divide non-product part accompanying the peripheral circumference of a work into scrap chips less than a specified size by one process in the case of trimming the range thereof and dividing them into plural numbers of scrap chips. CONSTITUTION: The range S of non-product accompanying the peripheral circumference of the work W formed into a prescribed shape is cut with trimming cutting blades A, D provided respectively on upper and lower dies along the work peripheral circumference line Lw and trimmed, then the range of non- product part is divided into plural numbers of scraps chips Sc with scrap cutters provided on the upper and lower dies respectively. In this trimming method, the scrap cutters B, C, X, and b, c cut the range of non-product parts S not only in the direction cross to the work peripheral circumference line Lw, but in the direction of being almost along the work peripheral circumference line to divide them into plural scrap chips.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trimming method and apparatus, and more particularly, a non-product part region attached to a peripheral part of a work is cut along a peripheral line of the work for trimming, and the non-product part region is divided into a plurality of parts. The present invention relates to a trimming method and device for dividing into scrap pieces.

[0002]

2. Description of the Related Art As is well known, when a workpiece having a predetermined shape is formed by subjecting a plate-shaped material such as a steel plate to a press working such as drawing, the non-product portion area attached to the peripheral portion of the workpiece is trimmed. It is cut along the work peripheral line by processing, separated from the work, and discarded as scrap. In this case, the non-product area (scrap) separated from the work by the above trimming process
Is usually divided into scrap pieces of a certain size or smaller so as to be easily discharged and then discharged.

With respect to the division of scrap, in recent years, a trimming method has been put into practical use in which not only a trimming cutting edge but also a scrap cutter is provided in a trimming apparatus so that the scrap dividing step can be performed simultaneously with the trimming. (For example, Japanese Patent Laid-Open No. Hei 4
(See Japanese Patent Publication No. 147721). According to this trimming method, for example, as shown in FIG. 4, when the non-product part region S ′ attached to the peripheral edge of the work W ′ is cut / separated along the work peripheral line Lw ′ and trimmed. At the same time, it is cut along each cutting line Lb ′ in the direction intersecting the outer edge line Lo ′ of the non-product part region S ′ and the work peripheral line Lw ′ (that is, the width direction) and divided into a large number of scrap pieces Sc ′. It And this scrap piece Sc '
Are usually conveyed to a predetermined scrap disposal station by an automatic conveying device such as a chute or a conveyor device.

[0004]

However, there is a case where the scrap piece Sc 'cannot be divided into a size smaller than a certain size by simply cutting the non-product portion area S'in the width direction as in the conventional method. Occurs. That is, for example, in the case of a so-called side frame forming a side surface portion of a vehicle body of an automobile, for example, as shown in FIG.
The side frame W "of the automobile is provided with so-called wheel arch portions Wa" corresponding to the positions where the wheels are arranged. In this wheel arch portion Wa ", the non-product portion area S" such as the front and rear portions thereof is provided. The width is not constant, and the widthwise dimension of this portion is considerably large. Therefore, as before,
If the scrap pieces Sc ″ are cut only in the width direction, the size of the scrap pieces Sc ″ cannot be reduced to a certain size or less, and the transfer device such as a chute or a conveyor device is clogged at the time of unloading, so that automatic transfer can be smoothly performed. There is a problem that you cannot do it.

For this reason, for such a large scrap piece, a step for subdividing is separately provided so that the size is kept below a certain level so as not to hinder automatic conveyance. However, the scrap division requires two steps, which is disadvantageous in increasing the production efficiency of the entire pressing step including scrap disposal.

The present invention has been made in view of the above-mentioned problems, and when trimming a non-product portion region attached to the peripheral portion of a work and dividing the scrap into a plurality of scrap pieces, a size of a certain size or less can be reliably obtained in one step. It is an object of the present invention to provide a trimming method and device capable of dividing into scrap pieces.

[0007]

Therefore, the invention according to claim 1 of the present application (hereinafter, referred to as the first invention) has a non-product part region attached to the peripheral portion of a work formed in a predetermined shape. While trimming is performed along the work peripheral line by the trimming cutting blades provided in the respective molds, the non-product region is divided into a plurality of scrap pieces by the scrap cutters provided in the upper and lower molds, respectively. In the trimming method, the scrap cutter divides the non-product part region into a plurality of scrap pieces not only in a direction intersecting with the work peripheral line but also in a direction substantially along the work peripheral line. It is the one.

The invention according to claim 2 of the present application (hereinafter,
In the first invention, the scrap cutter intersects with the outer edge line of the non-product part region, following the cutting along the work peripheral line by the trimming cutting blade. Cutting along at least a pair of outer width direction cutting lines extending to a middle part from the line to the work peripheral line, and a peripheral direction extending in a direction substantially along the work peripheral line by connecting each end of the outer width direction cutting lines By cutting along the cutting line and cutting along the inner width direction cutting line from each end of the outer width direction cutting line to the work peripheral line from each end of the outer width direction cutting line, as a series of cutting operations, the non-product part region Is divided into a plurality of scrap pieces.

The invention according to claim 3 of the present application (hereinafter,
(Third invention) is a non-product part region attached to the peripheral portion of the workpiece formed into a predetermined shape is cut along the workpiece peripheral line by the trimming cutting blades provided in the upper and lower molds, respectively, and at the same time, In a trimming device that divides the non-product part region into a plurality of scrap pieces by scrap cutters provided in the upper and lower molds, respectively, the scrap cutter has a direction in which the non-product part region intersects a work peripheral line. And a widthwise scrap cutting edge for cutting the non-product region in a direction substantially along the work peripheral line.

The invention according to claim 4 of the present application
(Hereinafter, referred to as a fourth invention.) In the third invention, the width-direction scrap cutting edge is provided with a plurality of scraps in the non-product part region following the cutting along the work peripheral line by the trimming cutting edge. An outer width direction for cutting along at least a pair of outer width direction cutting lines that intersects with the outer edge line of the non-product part region and extends to a middle part from the outer edge line to the work peripheral line. A cutting blade and an inner width direction cutting blade that performs cutting along the inner width direction cutting line from each end of the outer width direction cutting line to the work peripheral line are provided, and the peripheral direction scrap cutting blade is the above. It is characterized in that each end of the outer width direction cutting line is connected to each other to perform cutting along a peripheral direction cutting line extending in a direction substantially along the work peripheral line. .

Further, the invention according to claim 5 of the present application
(Hereinafter, referred to as a fifth invention) is the above-mentioned third or fourth invention, wherein the upper die trimming cutting edge is for cutting a work peripheral line corresponding to a wide portion of the non-product portion region. 1 trimming cutting edge, and a second trimming cutting edge for cutting the peripheral line of the non-product part region continuing to both sides of the wide portion, the first trimming cutting edge is located more than the second trimming cutting edge. The trimming cutting blade of the lower mold is characterized by being constituted by one cutting blade which is continuous along the work peripheral line, while being lowered by a fixed amount and set downward.

The invention according to claim 6 of the present application
(Hereinafter, referred to as a sixth invention), in the fifth invention, the peripheral scrap cutting edge of the upper die is provided above the first trimming cutting edge by a predetermined amount, while the peripheral edge of the lower die. The directional scrap cutting edge is characterized by being provided below the lower die trimming cutting edge by a predetermined amount.

The invention according to claim 7 of the present application
(Hereinafter, referred to as a seventh invention), in any one of the third to sixth inventions, the width direction scrap cutting edge of the lower die is provided below the lower die trimming cutting edge by a predetermined amount, Moreover, the scrap cutting edge of the lower die in the peripheral direction is provided below the scrap cutting edge of the lower die in the width direction by a predetermined amount.

[0014]

According to the first invention of the present application, in the scrap cutter, not only in the direction (width direction) in which the non-product portion region intersects with the work peripheral line, but also along the work peripheral line. Since it is also cut in the direction (peripheral direction) and divided into multiple scrap pieces, a separate process is provided even if the width of the non-product area is not constant but wide due to the product shape of the molded product. It is possible to surely subdivide the size of scrap pieces into a certain size or less without need, facilitate discharge of scrap pieces, and effectively prevent problems such as clogging during automatic unloading.

Further, according to the second invention of the present application, basically, the same effect as that of the first invention can be obtained. In particular, since the non-product area is separated from the work by trimming first, the subsequent division work into scrap pieces adversely affects the shape accuracy and the finished state of the cut part in the periphery of the work and its vicinity. Can be reliably prevented. Further, in the step of dividing into scrap pieces, since the cutting is performed first along the outer width direction cutting line that intersects the outer edge line which is the free end of the non-product portion region, for example, the cutting along the peripheral direction cutting line is performed. The cutting work can be performed as smoothly as possible compared to the case where the cutting is performed first.

Further, according to the third invention of the present application, since the scrap cutter is provided with the width-direction scrap cutting edge and the peripheral-direction scrap cutting edge, the non-product area is defined as a work peripheral line. Not only in the intersecting direction (width direction) but also in the direction (peripheral direction) substantially along the work peripheral line, it can be divided into a plurality of scrap pieces. Even if the width of the scrap is not constant and a wide portion is generated, the size of the scrap piece can be surely subdivided to be equal to or smaller than a certain size without providing another step. As a result, the scrap pieces can be easily discharged, and it is possible to effectively prevent problems such as clogging during automatic unloading.

Further, according to the fourth invention of the present application,
Basically, the same effect as that of the third invention can be obtained. In particular, since the non-product area is separated from the work by trimming first, the subsequent division work into scrap pieces adversely affects the shape accuracy and the finished state of the cut part in the periphery of the work and its vicinity. Can be reliably prevented. Further, the width-direction scrap cutting edge is provided with the outer width-direction cutting edge and the inner width-direction cutting edge, and the peripheral-direction scrap cutting edge connects the terminals of the outer width-direction cutting line to the work peripheral line. Since the cutting is performed along the peripheral cutting line extending in the substantially parallel direction, the cutting along the outer width direction cutting line intersecting with the outer edge line which is the free end of the non-product portion area is performed in the dividing step into scrap pieces. It can be set to be performed first, and the cutting work can be performed as smoothly as possible, for example, as compared with the case where the cutting along the peripheral direction cutting line is performed first.

Further, according to the fifth invention of the present application,
Basically, the same effect as that of the third or fourth invention can be obtained. Moreover, the trimming cutting edge of the upper die is composed of a first trimming cutting edge and a second trimming cutting edge, and the first trimming cutting edge is lowered from the second trimming cutting edge by a predetermined amount. On the other hand, the trimming cutting edge of the lower die is composed of one continuous cutting edge along the work peripheral line, so when the upper die descends with respect to the lower die, By the shearing action of the first trimming cutting edge and the lower die trimming cutting edge, cutting is performed along the work peripheral line corresponding to the wide portion,
Then, the shearing action of the second trimming cutting edge and the lower die trimming cutting edge can perform the cutting along the peripheral line of the non-product part region continuing to both sides of the wide portion. That is, the cutting timing during trimming can be made different between the wide part of the non-product part area and the part continuing to both sides, and even if the shape of the wide part is significantly different from the shape of both sides It is possible to deal with it without difficulty. Further, by lowering the first trimming cutting edge by a predetermined amount and setting it below the second trimming cutting edge, the first trimming cutting edge is set outside the first trimming cutting edge (that is, the work peripheral edge line corresponding to the wide portion). On the outside), it will be possible to easily set up scrap cutting edges which, after trimming, divide the non-product area into scrap pieces.

Further, according to the sixth invention of the present application,
Basically, the same effect as the fifth aspect of the invention can be obtained. In particular, the peripheral cutting scrap edge of the upper die is provided above the first trimming cutting edge by a predetermined amount, while the peripheral scrap cutting edge of the lower die is below the lower trimming cutting edge by a predetermined amount. Therefore, it is possible to set so that the cutting along the peripheral cutting line is surely performed after the trimming process.

Further, according to the seventh invention of the present application,
Basically, the same effect as any one of the third to sixth inventions can be obtained. In particular, the lower die width direction scrap cutting edge is provided below the lower die trimming cutting edge by a predetermined amount, and the lower die peripheral direction scrap cutting edge is a predetermined amount than the lower die width direction scrap cutting edge. Since the trimming process is performed, the non-product part region can be set to be sequentially cut in the width direction and along the peripheral direction after the trimming process.

[0021]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 and FIG. 2 respectively show a side surface and a front surface (Y in FIG. 1) of an arrangement structure of cutting blades in upper and lower molds as a trimming apparatus according to the present embodiment.
It is explanatory drawing shown typically from the (Y direction). Further, FIG. 3 is an enlarged plan view showing a wide portion of the non-product portion region attached to the peripheral portion of the work to be trimmed by the trimming device. Figure 1 above
As shown in FIG. 2, the upper die 2 of the trimming device 1 cuts and separates the non-product portion region S attached to the peripheral portion of the workpiece W formed into a predetermined shape along the workpiece peripheral line Lw. Upper die trimming cutting edges A and D and cutting edges B, C and X as upper die scrap cutters for dividing the non-product part region S into a plurality of scrap pieces Sc are provided. Further, the lower mold 3 has a lower mold trimming cutting edge a,
It is provided with cutting blades b and c as lower mold scrap cutters.

The upper die trimming cutting edges A and D are the work peripheral line Lw1 corresponding to the wide portion of the non-product portion region S.
And a second trimming cutting edge D for cutting the peripheral edge line Lw2 of the non-product part region S continuing to both sides of the wide portion.
The trimming cutting edge A is set lower than the second trimming cutting edge D by being stepped down by a predetermined amount. in this way,
By setting the first trimming cutting edge A lower than the second trimming cutting edge D by a predetermined amount and setting it downward, outside the first trimming cutting edge A (that is, the work peripheral line corresponding to the wide portion). It becomes possible to easily set a scrap cutting edge for dividing the non-product part region S into the scrap pieces Sc after the trimming process) (outside Lw1).

The upper scrap cutters B, C and X are
A pair of outer sides which are provided on the mold portion outside the trimming cutting edges A and D and which intersect the outer edge line Lo of the non-product part region S and extend to the middle part from the outer edge line Lo to the work peripheral edge line Lw. An outer width direction cutting blade B for cutting along the width direction cutting line L3 and a peripheral direction cutting line L4 which connects the respective ends of the outer width direction cutting line L3 and extends in a direction substantially along the work peripheral line Lw.
Along the inner width direction cutting edge L for cutting along the inner width direction cutting line L5 from each end of the outer width direction cutting line L3 to the work peripheral edge line Lw. C and the peripheral edge cutting edge X and the outer width direction cutting edge B are set below the first trimming cutting edge A. The peripheral edge cutting edge X and the outer width direction cutting edge B are set at the same level in the vertical direction. In addition, in FIG. 3, the combination of the alphabetical symbols described in parentheses above or below the symbols of the respective cutting lines indicates the combination of the cutting blades when cutting along the relevant cutting line.

On the other hand, the lower die trimming cutting edge a is composed of one continuous cutting edge along the work peripheral line Lw. Further, the lower die scrap cutters b and c are provided on the die portion outside the trimming cutting edge a, intersect with the outer edge line Lo of the non-product part region S, and change from the outer edge line Lo to the work edge line Lw. Width direction cutting line L3,
A width direction cutting edge b for cutting along L5, and a circumferential direction cutting edge c for cutting along a circumferential direction cutting line L4 extending in a direction substantially along the work circumferential line Lw, The widthwise cutting edge b is set below the trimming cutting edge a by a predetermined amount, and the peripheral edge cutting edge c is set below the widthwise cutting edge b by a predetermined amount. By setting the respective cutting edges a, b, c of the lower die 3 in this way, it is set that after the trimming process, the non-product part region S is sequentially cut in the width direction and along the peripheral direction. can do.

The upper and lower molds 2 and 3 provided with the respective cutting edges as described above are respectively attached to the outer sides of upper and lower molding dies (not shown) for performing press molding such as drawing. By lowering the upper die of the forming die with respect to the lower die, the upper die 2 is lowered with respect to the lower die 3, and at the same time as the forming of the work W, trimming and non-trimming of the work peripheral portion are performed. The product area S is divided into scrap pieces Sc. Hereinafter, the trimming process and the dividing process of the non-product part region S into the scrap pieces Sc will be described. Upper mold 2 is lower mold 3 as described above
When descending with respect to, the trimming process for cutting and separating the non-product part region S located between the two dies 2 and 3 along the peripheral line Lw of the work W is first performed. In this way, first, by performing the trimming process to separate the non-product part region S from the work W, the subsequent dividing work into scrap pieces Sc is performed in the peripheral portion of the work W and the shape accuracy and the cutting portion in the vicinity thereof. It is possible to reliably prevent the finish state of the product from being adversely affected.

In the present embodiment, as described above, the trimming cutting edge of the upper mold 2 is constituted by the first and second trimming cutting edges A and D having a step difference in the vertical direction, while the trimming cutting edge of the lower mold 3 is formed. Since the blade a is composed of one continuous cutting edge, when the upper die 2 descends, first, the shearing action of the first trimming cutting edge A and the lower die trimming cutting edge a corresponds to a wide portion. The cutting is performed along the work peripheral edge line Lw1 and, subsequently, by the shearing action of the second trimming cutting edge D and the lower die trimming cutting edge a, the peripheral edge of the non-product part region S continuing to both sides of the wide portion. The cutting is performed along the line Lw2. In this way, even if the shape of the wide portion is significantly different from the shape of the both side portions by making the cutting timing at the time of trimming different between the wide portion of the non-product portion area S and the portions continuing to both sides thereof. It is possible to deal with it relatively easily.

After the trimming process is completed, when the upper die 2 is further lowered, the step of dividing the non-product region S into the scrap pieces Sc is started. First, the outer widthwise cutting edge B of the upper die 2 and the lower cutting edge B are cut. Due to the shearing action of the widthwise cutting edge b of the mold 3, cutting is performed along the pair of outer widthwise cutting lines L3. In this way, the division into scrap pieces Sc is performed in the non-product part area S
By first performing the cutting along the outer width direction cutting line L3 intersecting the outer edge line So which is the free end of
For example, the cutting operation can be performed as smoothly as possible compared with the case where the cutting along the peripheral direction cutting line L4 is performed first.

After the cutting along the outer width direction cutting line L3 is performed, when the lowering of the upper die 2 proceeds further, the peripheral edge cutting edge X of the upper die 2 and the peripheral edge cutting of the lower die 3 are turned. Blade c
The cutting action is performed along the peripheral cutting line L4. As a result, the wide portion of the non-product portion region S is cut not only in the width direction but also in the peripheral direction, and two more finely divided scrap pieces Sc are obtained. After this,
When the upper die 2 continues to descend further, finally, due to the shearing action of the inner widthwise cutting edge C of the upper die 2 and the widthwise cutting edge b of the lower die 3,
Cutting is performed along the pair of inner width direction cutting lines L5. The inner width direction cutting edge C of the upper die 2 is provided so as to rise while inclining obliquely upward from the inner side toward the outer side, and the outer side portion thereof is the peripheral edge cutting edge X.
And is located above the outer widthwise cutting tool B.
Then, after the cutting along the peripheral direction cutting line L4 is performed, the inside width direction cutting blade C and the outside width direction cutting blade B of the upper mold 2 are completed so that the cutting along the inside width direction cutting line L5 is completed. And the peripheral cutting edge X and the widthwise cutting edge b of the lower mold 3.
And the dimensional relationship of the peripheral cutting blades c and the like in the vertical direction is set.

After the non-product part region S is divided into a plurality of scrap pieces Sc as described above, the upper mold 2 is lifted to take out the work W, and each of the divided scrap pieces Sc is, for example, a chute. (Not shown) is automatically carried out to a scrap disposal station (not shown).

As described above, according to this embodiment, the non-product part region S is cut not only in the width direction but also in the direction substantially along the work peripheral line Lw.
Even if the width of the non-product part region S is not constant and a wide part is generated depending on the product shape of the work W, the size of the scrap piece Sc can be surely subdivided to a certain size or less without providing another step. . As a result, scrap pieces S
It becomes easy to discharge c, and it is possible to effectively prevent the occurrence of troubles such as clogging when the chutes are automatically carried out.

In the above embodiment, when the non-product part region S is divided into a plurality of scrap pieces Sc, a peripheral direction cutting line which is cut substantially along the work peripheral line Lw1 is provided in the wide part of the non-product part region S. However, depending on the size and shape of the non-product portion region S, a plurality of such peripheral direction cutting lines may be set in the width direction or in the peripheral direction.

The present invention is not limited to the above-described embodiments, and within the scope of the invention,
It goes without saying that various improvements and design changes are possible.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an arrangement structure of cutting blades in upper and lower molds according to an embodiment of the present invention.

FIG. 2 is a front explanatory view schematically showing an arrangement structure of cutting blades in each of the molds.

FIG. 3 is an enlarged plan view showing a wide portion of a non-product portion region attached to a peripheral portion of a work to be trimmed by the upper and lower molds.

FIG. 4 is an explanatory plan view showing a conventional trimming method.

FIG. 5 is an explanatory plan view showing a trimming method for a side frame of an automobile.

[Explanation of symbols]

 1 ... Trimming device 2 ... Upper mold 3 ... Lower mold A ... Upper mold first trimming cutting edge B ... Upper mold outer width direction cutting edge C ... Upper mold inner width direction cutting edge a ... Lower mold trimming cutting Blade b ... Lower die width direction cutting edge c ... Lower die peripheral edge cutting edge L3 ... Outer width direction cutting line L4 ... Edge direction cutting line L5 ... Inner width direction cutting line Lo ... Outer edge line Lw of non-product part area, Lw1, Lw2 ... Work peripheral line S ... Non-product area Sc ... Scrap piece W ... Work X ... Edge cutting edge

Claims (7)

[Claims] 1. A non-product part region attached to a peripheral portion of a work formed into a predetermined shape is cut along a work peripheral line by trimming cutting blades provided in upper and lower molds respectively for trimming. In a trimming method in which the non-product part region is divided into a plurality of scrap pieces by scrap cutters provided in the respective molds, the scrap cutter has the non-product part region only in a direction intersecting the work peripheral line. First, a method for trimming is characterized in that it is cut in a direction substantially along the peripheral line of the work and divided into a plurality of scrap pieces. 2. The scrap cutter, following the cutting along the work peripheral line by the trimming cutting blade, intersects with the outer edge line of the non-product portion region to a middle portion from the outer edge line to the work peripheral line. Cutting along at least a pair of outer widthwise cutting lines extending, and cutting along a peripheral cutting line extending in a direction substantially along the work peripheral line connecting the ends of the outer widthwise cutting line, and the outer side By cutting along the inner width direction cutting line from each end of the width direction cutting line to the work peripheral line, by sequentially performing a series of cutting operations,
The trimming method according to claim 1, wherein the non-product part region is divided into a plurality of scrap pieces. 3. A non-product part region attached to a peripheral portion of a work formed into a predetermined shape is cut along a work peripheral line by trimming blades provided on upper and lower molds respectively for trimming and at the same time, In a trimming device that divides the non-product part region into a plurality of scrap pieces by scrap cutters provided in the respective molds, the scrap cutter cuts the non-product part region in a direction intersecting the work peripheral line. A trimming apparatus comprising: a width-direction scrap cutting edge; and a peripheral-direction scrap cutting edge that cuts the non-product part region in a direction substantially along a work peripheral line. 4. The width-direction scrap cutting edge is for dividing the non-product area into a plurality of scrap pieces following the cutting along the work peripheral line by the trimming cutting edge. Outer width direction cutting blades that cut along at least a pair of outer width direction cutting lines that intersect the outer edge line and extend from the outer edge line to a midway portion to the work peripheral line, and each end of the outer width direction cutting line. From the work peripheral edge line to the inner widthwise cutting edge to perform cutting along the inner widthwise cutting line, the peripheral scrap cutting edge, the outer widthwise cutting line by connecting each end of the work piece The trimming apparatus according to claim 3, wherein cutting is performed along a peripheral cutting line extending in a direction substantially along the peripheral line. 5. The trimming cutting blade of the upper die includes a first trimming cutting blade for cutting a work peripheral line corresponding to a wide portion of the non-product portion area, and a non-product portion continuing to both sides of the wide portion. Second for cutting the peripheral line of the area
The first trimming cutting edge is set lower than the second trimming cutting edge by a predetermined amount and is set lower than the second trimming cutting edge, while the lower trimming cutting edge extends along the work peripheral line. The trimming device according to claim 3 or 4, wherein the trimming device is configured by one continuous cutting edge. 6. The peripheral scrap cutting edge of the upper die is provided above the first trimming cutting edge by a predetermined amount, while the peripheral scrap cutting edge of the lower die is located more than the lower die trimming cutting edge. The trimming device according to claim 5, wherein the trimming device is provided below the fixed amount. 7. The widthwise scrap cutting edge of the lower die is provided below the trimming cutting edge of the lower die by a predetermined amount, and the peripheral scraping edge of the lower die is lower than the scraping edge of the lower die widthwise. The trimming device according to any one of claims 3 to 6, wherein the trimming device is also provided below by a predetermined amount.