JP2012076110A - Method of producing press-formed article of metal sheet and rupturing and separating device using for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of producing a press-formed article of a metal sheet for separating a formed article and scrap parts without lowering production efficiency and without generating chips.SOLUTION: In the shearing and trimming work of the press-formed article of the metal sheet, the method includes: a first step where trimming lines 8 for separating the metal sheet 5 into the formed article 6 and the scrap parts 7 are cut completely by a primary shearing and a plurality of scrap cutting lines 9 for dividing the scrap parts 7 into pieces are cut by leaving remaining parts 9A on the sides of the trimming lines 8; and further a second step where the division into pieces of the scrap parts 7 is completed by rupturing the remaining parts 9A.

Description

  The present invention relates to a shear trimming process of a sheet metal press-formed product, and more particularly to a method for producing a sheet metal press-formed product and a break separating apparatus used therefor.

  Lightening automobiles to save energy and solve environmental problems is an urgent issue that needs to be resolved. One of the countermeasures is to change the body material from a steel plate to an aluminum alloy plate. The vehicle body panel is manufactured by press-molding a thin metal plate material with a die. Usually, the molding is performed in four steps of drawing, trimming (cutting), bending, and other processing as required.

  Conventionally, the trimming process in the molding is performed by a method as shown in FIGS. 5 and 6, for example. A schematic diagram of the trimming die is shown in FIG.

(1) The upper blade 2 cuts the trimming line 108 for separating the sheet metal 5 into the molded product portion 106 and the scrap portion 107 by primary shearing. (See FIG. 6 (A))
(2) Next, in order to facilitate removal by dropping the scrap part 106 from the apparatus, the lower blade 4 similarly cuts the scrap cut line 109 for dividing the scrap part 107 by primary shearing (FIG. 6 ( B)).

  At this stage, the T-shaped portion 110 where the trimming line 108 and the scrap cut line 109 intersect is not completely cut. Therefore, the trimming line 108 is not partially cut at the secondary shear portion. 108A remains (see FIG. 6B).

(3) Finally, the secondary shear portion 108A is cut and the molded product portion 106 and the scrap portion 107 are completely separated. At this time, the T-shaped portion 110 may be completely cut by the primary shear. Therefore, the T-shaped portion 110 is completely cut by shifting the timing by forming a step in the upper blade 2 and cutting the secondary shear portion 108A by secondary shear (see FIG. 6C). ).

  However, in the aluminum alloy sheet press forming, there are some technical difficulties that do not exist in conventional steel sheets. One of the problems is that since the surface of an aluminum alloy is easily scratched at the time of molding, a large amount of defective molded products are likely to occur, and a lot of manpower is required to correct the scratches. . For this reason, in the manufacturing process of the press molding of an aluminum alloy plate, the cost is increased rather than energy saving, which is a major obstacle to weight reduction by adopting an aluminum body. The main cause of this defective molded product is the surface generated when chips (chips) generated in the trimming process in drawing are scattered around and adhere to the mold surface, and the aluminum alloy base plate is pressed there. It is a defect.

  The chip is produced in a large amount at the stage of cutting the trimming line by the secondary shear in the trimming process in the drawing (for example, the stage of cutting the secondary shear portion 108A).

  Further, such a chip not only causes the surface defect but also accumulates in a mold or the like of a processing apparatus. Therefore, it is necessary to clean the mold or the like to remove the chip, leading to a decrease in productivity. In particular, the influence is large in the case of an aluminum alloy plate, and it is necessary to clean the plate about every 10 to 100 sheets in the case of an aluminum alloy plate while the plate is cleaned about every 1000 sheets. This also increases the cost of aluminum alloy press-formed products.

  Although it is possible to solve this problem by separating the molded product part and the scrap part without dividing the scrap part, it is necessary to increase the process of removing the scrap part as a large lump with human power or a machine. This leads to a considerable decrease in production efficiency.

  Therefore, an object of the present invention is to separate a molded product part and a scrap part without reducing the production efficiency and without generating chips.

  In the shear trimming processing of a sheet metal press-formed product, the present invention completely cuts a trimming line for separating a sheet metal into a molded product part and a scrap part by primary shearing, and a plurality of parts for dividing the scrap part. The scrap cutting line has a first step of cutting the remaining portion on the trimming line side, and further having a second step of breaking the remaining portion and completing the cutting of the scrap portion. This is a method for producing a sheet metal press-formed product.

  Further, the present invention is a method for producing a sheet metal press-formed product, wherein a notch is formed in the remaining portion in the first or second step.

  According to another aspect of the present invention, there is provided a sheet metal press-molded product, wherein the notch of the residual portion is formed by a trim blade, and the scrap portion is pressed and broken while the trim blade is bitten into the notch. It is a production method.

  Further, the present invention is the method for producing a sheet metal press-formed product, wherein the length of the remaining portion is 2 mm to 5 mm.

  Further, the present invention is a break separating device for breaking the residual portion used in the method for producing a sheet metal press-formed product, comprising a trim blade for forming a notch in the residual portion, It is a break separating apparatus characterized by having a head part for pressing the scrap part and breaking the remaining part while the trim blade is biting into the remaining part.

  Further, the present invention is the fracture separating device characterized in that the trim blades are provided in a pair of upper and lower so as to sandwich the remaining portion.

  Further, the present invention is the fracture separating device, wherein the head portion is attached to the upper trim blade by a magnet.

  By primary shearing, the trimming line for separating the sheet metal into the molded product part and the scrap part is completely cut, and a plurality of scrap cut lines for dividing the scrap part are cut leaving the remaining part on the trimming line side. Then, by breaking the remaining portion and completing the division of the scrap portion, the scrap portion can be easily separated, and the molded product portion and the scrap portion can be separated without performing secondary shearing. Will not occur.

  Further, by forming a notch in the remaining portion, it can be more easily broken. The length of the remaining portion is appropriately selected as necessary, but is preferably 2 mm to 5 mm.

  Therefore, the chip hardly causes surface defects in the molded product portion, and the occurrence of defective molded products can be significantly suppressed without reducing the production efficiency.

  Moreover, the said residual part can also be made to fracture | rupture with the fracture | rupture separation apparatus which has a trim blade for providing a notch in the said residual part, and has a head part for pressing the said scrap part. Preferably, the trim blades are provided in a pair of upper and lower so as to sandwich the sheet metal. The head portion can be attached to the upper trim blade by a magnet.

It is a schematic diagram of a trimming die. It is the schematic of the trimming process in embodiment of this invention, (A) is the sheet metal before a cutting | disconnection, (B) is the sheet metal after a cutting | disconnection, (C) is the sheet metal after a fracture | rupture (molded product part), respectively. FIG. It is a schematic diagram of a fracture separator. It is an enlarged view of the residual part 9A side surface in a fracture | rupture separation process. It is the schematic of the conventional trimming line cutting process, and is a figure which shows the sheet metal before a cutting | disconnection. 5A and 5B are enlarged views of main parts, in which FIG. 5A shows a trimming line at the start of cutting, FIG. 5B shows a scrap cut line at the time of cutting, and FIG.

  An embodiment of the present invention will be described with reference to FIGS. In the present invention, the upper side in FIG. 1 is defined as the top side and the lower side is defined as the bottom side with reference to the sheet metal 5. A shear trimming apparatus (not shown) is provided with an upper mold 1 that can be moved up and down on the top surface side, and a lower mold 3 that is opposed to the upper mold 1 on the bottom surface side. The upper die 1 is provided with an upper blade 2 for cutting a trimming line 8 that separates the molded product portion 6 and the scrap portion 7, and the lower die 3 has a plurality of pieces for dividing the scrap portion 7. The lower blades 4 for cutting the scrap cut line 9 are provided at intervals.

Next, the process of trimming the sheet metal 5 will be described below.
(1) The sheet metal 5 to be trimmed is placed on the lower mold 3. By lowering the upper die 1 and pressing the sheet metal 5 so as to be sandwiched between the upper die 1 and the lower die 3, first, the upper blade 2 starts cutting the trimming line 8 by primary shearing.
(2) Subsequently, the plurality of scrap cut lines 9 are cut by primary shearing by the lower blade 4.

  At this time, the trimming line 8 is completely cut by the upper blade 2, and the molded product portion 6 and the scrap portion 7 are completely divided. However, since the T-shaped portion 10 where the two trimming lines 8 and the scrap cut line 9 intersect as described above cannot be completely cut by primary shearing, the scrap cut line 9 is completely cut depending on the lower blade 4. The remaining portion 9A is cut without being cut on the trimming line 8 side of the scrap cut line 9.

  The length L of the remaining portion 9A is appropriately selected depending on the processing conditions such as the material of the sheet metal 5 and the shape of the trimming line 8. In the present embodiment, the length L of the residual portion 9A is adjusted to be 2 mm to 5 mm in order to facilitate breakage of the residual portion 9A described later. Note that a plurality of scrap cut lines 9 are formed in a direction orthogonal to the trimming line 8 or in an inclined direction, but the number and direction of the scrap cut lines 9 can be changed as appropriate.

(3) Thereafter, the remaining portion 9A is broken by the break separating device 21, and the molded product portion 6 and the scrap portion 7 are completely separated. The details of the break separator 21 will be described later (see paragraph numbers [0030] to [0034]).
(4) Then, the scrap portion 7 divided into a plurality of pieces 7p by the break separating device 21 is pushed by the head portion to break, falls by its own weight, and is removed from the lower mold 3.

In addition, removal of the divided scrap part 7 can be performed by the following method, for example.
(A) The lower mold 3 or the lower blade 4 is inclined, and the scrap portion 7 is slid down by its own weight.
(B) The upper die 1 or the lower die 3 is provided with a pushing jig and pushed down.
(C) A nozzle or the like that ejects air or the like is provided, and is dropped simultaneously with cutting and separation by the wind pressure.

  Next, the break separating device 21 for breaking the remaining portion 9A will be described. The break separating device 21 includes a pair of upper and lower trim blades 22 and 23 and a head portion 24.

  The pair of trim blades 22 and 23 are for forming notches 9a and 9b so that the remaining portion 9A can be easily broken. The portions with the notches 9a and 9b This is a so-called weakened portion, which is thinner than the thickness of this portion. The first trim blade 22 for forming the notch 9a and the second trim blade for forming the notch 9b are provided facing each other so as to sandwich the remaining portion 9A, and are respectively provided on the upper die 1 and the lower die 3. . The second trim blade 23 can be provided integrally with the lower blade 4 by providing a step or the like on the lower blade 4.

  The head portion 24 is for pressing the scrap portion 7 when the residual portion 9A is broken, and is attached so as to extend from any one of the upper die 1, the lower die 3, and the trim blades 22 and 23. . In the present embodiment, it is attached to the first trim blade 22. The head portion 24 includes a head main body 24a, a head support portion 24b for attaching the head main body 24a to the trim blade 22, and a head tip 24c attached to the tip of the head main body.

  In the present embodiment, the head support portion 24 b is attached to the first trim blade 22 by a magnet 25. Although it can be attached to the trim blades 22 and 23 by screws or the like, in particular, when the present embodiment is applied to existing equipment, it is advantageous because the attachment by the magnet 25 is easy to attach and detach, and the position can be changed. is there.

  The head main body 24 a can be adjusted in length, and at least when the remaining portion 9 is broken and separated, the head tip 24 c is formed by the first trim blade 22 according to the attachment location of the head portion 24. Also, the length is adjusted so as to be located below or above the second trim blade 23. In addition, a spring structure is prepared therein so that the scrap portion 7 can be pressed through the head tip 24c while appropriately changing its length in accordance with the movement of the upper die 1. In the present embodiment, the head tip 24c has a substantially triangular shape in plan view and can be replaced.

  Next, the operation of the fracture separator 21 will be described by taking as an example the case where the head portion 24 is attached to the first trim blade 22 as in the present embodiment. The process itself is the same when the head portion 24 is attached to the upper die 1 and when attached to the lower die 3 or the second trim blade 23 (however, the operation of the head portion 24 is reversed up and down). is there.

(1) First, in accordance with the movement of the upper die 1, the head portion 24 is lowered, and the head tip 24 c presses the piece 7 p of the scrap portion 7 and applies pressure P (see FIG. 4).
(2) At substantially the same time, the two trim blades 22 and 23 gradually bite into the remaining portion 9A, and notches 9a and 9b are formed on the top and bottom sides of the remaining portion 9A. Note that it is possible to form one notch deeply on one of the top surface side and the bottom surface side of the remaining portion 9A with a single trim blade.
(3) Thereafter, the notches 9a and 9b are formed deeper. At this time, since the second trim blade 23 remains in the remaining portion 9A, the piece 7p of the scrap portion 7 is bent with the remaining portion 9A as a fulcrum.
(4) Then, the remaining portion 9A breaks when it cannot withstand the stress applied to the remaining portion 9A by the pressure P, and the cutting of the scrap portion 7 is completed.

  In this process, the notches 9a and 9b are formed, so that the remaining portion 9A becomes thinner than the other portions of the scrap portion 7, and the remaining portion 9A is more easily broken, and the second trim blade 23 is removed. By applying pressure P to the piece 7p of the scrap portion 7 by the head portion 25 while being engulfed, a larger force can be concentrated on the residual portion 9A, so that the residual portion 9A can be easily broken. it can.

  As described above, in the present embodiment, the residual portion 9A is left on the scrap cut line 9 by primary shearing, and then the residual portion 9A is ruptured by the break separating device 21, so that it is molded without performing secondary shearing. The product part 6 and the scrap part 7 can be completely separated. Therefore, chips (chips) are not generated. Moreover, since the scrap part 7 can be divided in the trimming process, the scrap part 7 can be easily removed and the production efficiency is not lowered. Therefore, it is possible to provide a press-formed product made of an aluminum alloy at a relatively low cost so that a defective molded product is hardly generated.

  In addition, this Embodiment is applicable not only to an aluminum alloy but various materials, such as a super high-tensile steel plate, magnesium alloys, or carbon fiber reinforced plastic (CFRP), for example. Moreover, it is applicable also to the conventional steel plate.

1 Upper mold 2 Upper blade
3 Lower mold 4 Lower blade
5 Sheet metal 6,106 Molded parts
7,107 Scrap section 7p Piece 8,108 Trimming line 9,109 Scrap cut line
9A Residual part 10,110 T-shaped part
108A Secondary Shearing Section 21 Breaking Separator
22 First trim blade 23 Second trim blade
24 Head part 24a Head body
24b Head support 24c Head tip
25 Magnet L Residual length
P pressure

Claims (7)

In shear trimming of sheet metal press-formed products,
Trimming lines for separating the sheet metal into a molded product part and a scrap part by primary shearing are completely cut, and a plurality of scrap cut lines for dividing the scrap part are provided on the trimming line side. Having a first step of cutting leaving
The method for producing a sheet metal press-formed product, further comprising a second step of breaking the remaining portion and completing the cutting of the scrap portion.   The method for producing a sheet metal press-formed product according to claim 1, wherein a notch is formed in the remaining portion in the first or second step.   3. The sheet metal press-formed product according to claim 2, wherein the notch of the remaining portion is formed by a trim blade, and the scrap portion is pressed and broken while the trim blade is bitten into the notch. Production method.   The method of producing a sheet metal press-formed product according to claim 1, 2 or 3, wherein the length of the remaining portion is 2 mm to 5 mm. A break separation device for breaking the residual portion, which is used in the method for producing a sheet metal press-formed product according to claim 1, 2, 3, or 4.
A trim blade for forming a notch in the remaining portion;
A break separating apparatus comprising a head portion for pressing the scrap portion and breaking the remaining portion while the trim blade is biting into the remaining portion.   The break trimming apparatus according to claim 5, wherein the trim blades are provided in a pair of upper and lower sides so as to sandwich the remaining portion.   The break separating apparatus according to claim 5 or 6, wherein the head portion is attached to the upper trim blade by a magnet.

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