JP3619364B2 - Fine blanking method and fine blanking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fine blanking method for precisely punching a product from a metal coil material, and a fine blanking device used directly for carrying out the method.
[0002]
[Prior art]
When punching a product from a metal material, first the product is punched into a semi-punched state with a first blanking device, and then the product is punched into a fully punched state with a second blanking device. Japanese Patent Application Laid-Open No. 5-337666 discloses a product that suppresses the generation and obtains a high-quality product.
[0003]
The above first conventional blanking device urges a pad (plate presser) supported on the outer periphery of a punch fixed to the upper die so as to be vertically movable with a cushioning material and is fixed to the lower die. The counter punch (reverse pressing) supported so as to be movable up and down on the inner periphery of the skirt is urged upward by a cushion material. Then, by lowering the upper die relative to the lower die, the material is elastically pressed against the lower die with the upper die pad and fixed between the upper die punch and the lower die counter punch. The material sandwiched between the two is pushed down and punched out. At this time, the product partially separated from the material is connected to the material via a thin bridge portion in a state of being displaced downward with respect to the material.
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional product, when the upper die rises with respect to the lower die after the product is punched out in a half-punched state, the product sandwiched between the punch and the counter punch rises integrally with the upper die. The pad that elastically presses the material against the die cannot rise until the elastic force of the compressed elastic material is released, and starts to rise after the punch rises. As a result, the product clamped between the punch and the counter punch is forcibly pushed up against the material whose rise is restricted by the pad, and the bridge portion that connects the half-punched product and the material is deformed. There is a problem that the punching accuracy of the is lowered.
[0005]
The present invention has been made in view of the above-described circumstances, and an object thereof is to further improve the punching accuracy of a product in fine blanking by preventing deformation of a bridge portion that connects a half-punched product and a material.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is characterized in that the metal coil material is intermittently transported at a predetermined pitch in the longitudinal direction, and the product is delivered at the first processing station provided upstream in the transport direction. A half punching process is performed in which a part of the metal coil material is connected to the metal coil member by a bridge portion, and the half punched product is completely punched from the metal coil material at a second processing station provided on the downstream side in the conveying direction. A fine blanking method for performing a complete punching process, wherein the semi-punching process includes a punch provided on an upper die and a pad integrally coupled to the punch, a die provided on a lower die, and the die sliding First work to punch a product from a metal coil material into a half-punched state by lowering it against a counter punch that is freely penetrated and biased upward And the second step of lifting the integrally bonded punch and pad and lifting the product sandwiched between the punch and counter punch from the die together with the metal coil material by the upward biasing force of the counter punch, and further raising the pad and punch The third step of separating the product from the punch is performed by releasing the bond between the pad and the punch and lowering the pad relative to the punch.
[0007]
According to the above configuration, since the metal coil material is sandwiched from above and below by the punch and counter punch at the first processing station and the product is punched in a half punched state, the punching accuracy can be improved. Further, since the half-punched product can be punched out without using a counter punch and dropped by gravity at the second processing station, it is not necessary to blow off the product by air blow and the cycle time can be shortened. it can. Further, in the second step of lifting the product punched out in the first step from the lower mold in the second step, the pad is integrally joined with the punch and the pad is lifted together with the metal coil material. Only the product is prevented from rising while being pressed downward, and there is no possibility that the bridge portion connecting the product to the metal coil material is deformed and the punching accuracy is not lowered. Moreover, since the pad is lowered relative to the punch in the third step, the product can be separated from the punch, and the product and the metal coil material can be conveyed to the second processing station.
[0008]
The invention described in claim 2 is a fine blanking device for performing a half punching step in the fine blanking method described in claim 1, wherein the slider is supported by the upper die so as to be horizontally movable. A pressure plate that is supported so as to be movable up and down with respect to the upper mold and is coupled to the pad; an urging means that urges the pressure plate downward toward the slider; A first cam mechanism for horizontally moving the slider, and a second cam mechanism provided between the pressure plate and the slider. The second cam mechanism is formed by the horizontal movement of the slider while the upper die is lowered. The pressure plate and pad are coupled to a position that is relatively raised with respect to the punch, and the slider moves horizontally while the upper mold is raised. Releasing the serial coupling, characterized in that to relatively lower the pad against the punch by the urging force of the urging means.
[0009]
According to the above configuration, the slider is horizontally moved by the first cam mechanism as the upper mold is raised and lowered, and the pressure plate is raised and lowered by the second cam mechanism as the slider is horizontally moved. Moves up and down relative to the upper die, that is, relative to the punch. As a result, the pad is coupled to a position raised relative to the punch while the upper mold is lowered, and the coupling of the pad and the punch is released while the upper mold is lifted, and the biasing force of the biasing means The pad can be lowered relative to the punch. Thus, the relative position of the pad with respect to the punch can be easily and arbitrarily set only by changing the cam shapes of the first cam means and the second cam means.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0011]
1 to 12 show an embodiment of the present invention. FIG. 1 is an overall plan view of a fine blanking device, and FIG. 2 is an enlarged view of a main part of FIG. 3 is a sectional view taken along line 3-3 in FIG. 1, FIG. 4 is a sectional view taken along line 4-4 in FIG. 1 (at bottom dead center), and FIG. 5 is a sectional view taken along line 5-5 in FIG. 6 is an enlarged view of the main part of FIG. 5, FIG. 7 is an operation explanatory diagram showing a state at the top dead center, FIG. 8 is an operation explanatory diagram showing a state at the start of punching, and FIG. FIG. 10 is an operation explanatory view showing a state when ascending after punching, FIG. 11 is a process diagram of this example, and FIG. 12 is a perspective view of a metal element.
[0012]
The fine blanking device according to the present embodiment uses a metal element E (see FIG. 12) used for a metal belt of a metal belt type continuously variable transmission, for example, a metal coil material C (see FIG. 2) having a thickness of 1.5 mm. ) For continuous precision punching.
[0013]
As shown in FIG. 2, the metal coil material C that is intermittently conveyed from the left side to the right side in the drawing by a supply device (not shown) has four guide members 2 that are fixed to the lower mold 1 on both side edges. , Are guided by twelve guide rollers 3. From the upstream side to the downstream side in the conveyance direction of the metal coil material C, the metal element E is half-punched from the metal coil material C (the metal element E is not completely punched from the metal coil material C, part of which is a metal coil material A pair of first processing stations S punched out in a state of being connected to C) ₁ , S ₁ And a pair of second processing stations S that completely punch the metal element E in the half-punched state from the metal coil material C. ₂ , S ₂ And are provided.
[0014]
First processing station S ₁ And second processing station S ₂ Are respectively arranged along both side edges of the metal coil material C, and the first and second processing stations S on the right side (lower side in the drawing) in the transport direction. ₁ , S ₂ And the first and second processing stations S on the left side (upper side in the figure) in the transport direction. ₁ , S ₂ Is arranged so as to be shifted by one pitch P along the conveying direction of the metal coil material C. The upstream first processing station S ₁ And downstream second processing station S ₂ An interval of 4 pitches is provided between the two. Second processing station S ₂ The completely punched metal element E falls in the direction of the back side of the paper and is discharged, so that the second processing station S ₂ The metal coil material C on the downstream side of the through hole C has a shape of a metal element E ... ₂ ... are formed in two rows.
[0015]
As shown in FIG. 1 and FIGS. 3 to 5, guide posts 5 are erected at four corners of the fixed base 4 that supports the lower mold 1, and are lifted and lowered supported by the guide posts 5. The base 6 is driven up and down by a hydraulic cylinder (not shown). The upper mold 7 is fixed to the lower surface of the elevating base 6 with a plurality of bolts 8. A space 9 is formed between the lower surface of the elevating base 6 and the upper surface of the upper mold 7.
[0016]
Inside the space 9, the upper pressure plate 10 and the lower slider 11 are accommodated in a state where they are stacked one above the other. The slider 11 is supported so as to be slidable along the upper surface of the upper die 7 in a direction perpendicular to the conveying direction of the metal coil material C, and three urging means 12 provided at one end in the sliding direction. It is biased toward the other end in the sliding direction. Each urging means 12 includes a cylinder 13 fixed to the elevating base 6, a piston 14 slidably accommodated in the cylinder 13, a bolt 15 that couples the piston 14 to one end of the slider 11, and the piston 14 to the slider 11. And a spring 16 biased toward the head. Cam follower 11 provided at the other end of the slider 11 ₁ Is a convex portion 17 formed on the side surface of the cam member 17 erected on the fixed base 4. ₁ Or recess 17 ₂ It is elastically abutted on. Cam follower 11 of slider 11 ₁ And the cam member 17 comprises the 1st cam mechanism of this invention.
[0017]
The pressure plate 10 housed in the upper part of the space 9 between the elevating base 6 and the upper mold 7 has a plurality of cam followers 10 formed on the lower surface thereof. ₁ Are a plurality of cams 11 formed on the upper surface of the slider 11. ₂ Engage with ... The pressure plate 10 is urged downward by four urging means 18 provided on the elevating base 6. Each biasing means 18 is a cylinder 6 provided on the elevating base 6. ₁ And cylinder 6 ₁ And a plurality of disc springs 20 for urging the piston 19 downward, and a piston rod 21 extending downward from the piston 19 and coupled to the pressure plate 10. . Cam 11 of slider 11 ₂ ... and cam follower 10 of pressure plate 10 ₁ ... constitutes the second cam mechanism of the present invention.
[0018]
Thus, Cam Follower 10 ₁ ... cam 11 ₂ ... when fitted in the valleys between them (see Fig. 7), a slight gap is generated between the upper surface of the pressure plate 10 biased downward by the biasing means 18 ... and the lower surface of the lift base 6, Cam follower 10 ₁ ... cam 11 ₂ .. (See FIG. 5), the pressure plate 10 and the upper surface pushed upward approach the lower surface of the elevating base 6.
[0019]
The pad 22 and the pressure plate 10 disposed below the upper mold 7 are integrally coupled by four bolts 23 and spacers 24. Therefore, when the pressure plate 10 moves upward, the upper surface of the pad 22 approaches the lower surface of the upper die 7 (see FIG. 8), and when the pressure plate 10 moves downward, the upper surface of the pad 22 and the lower surface of the upper die 7 are interposed. A gap is generated (see FIG. 7).
[0020]
Four guide posts 25 are provided between the lower mold 1 and the upper mold 7 in order to guide the relative movement of the lower mold 1, the upper mold 7 and the pad 22 in the vertical direction. Further, in order to allow the slider 11 to slide, a long hole 11 is formed around one bolt 8 penetrating the slider 11. ₃ (See FIG. 5) is formed, and the long holes 11 are formed around the four spacers 24. ₄ (See FIG. 3) is formed. In addition, the long hole 11 shown in FIG. ₄ ... is formed long in the direction perpendicular to the paper surface.
[0021]
As is apparent from FIG. 4, the first processing station S ₁ In the upstream position of the guide coil C at a constant pitch in the center in the width direction of the metal coil material C. ₁ ... for punching (see FIG. 2), a guide hole punch 45 that is fixed to the upper die 7 and loosely penetrates the pad 22, and a guide hole that is fixed to the lower die 1 and cooperates with the guide hole punch 45. A die 46 is provided. A positioning pin 27 urged by a spring 26 so as to protrude from the lower surface of the pad 22 is provided at a position downstream of the guide hole punch 45. When the upper die 7 is lowered, the positioning pin 27 is a metal coil material C. Guide hole C ... ₁ And the metal coil material C is positioned in the conveying direction.
[0022]
As is apparent from FIG. 6, the first processing station S for punching the metal element E from the metal coil material C in a half-punched state. ₁ Is provided with a half-punching punch 29 fixed to the upper die 7 with stoppers 28, 28. The semi-punching punch 29 has a punch body 29 having a cross section substantially the same as the outer shape of the metal element E. ₁ And punch body 29 ₁ The punch body 29 is disposed at both ends of the punch ₁ A pair of half punched portions 29 having a cutting edge slightly retreated from the cutting edge ₂ , 29 ₃ And punch body 29 ₁ Arranged in the center of the punch body 29 ₁ Pin 29 protruding slightly from the cutting edge ₄ It consists of.
[0023]
In addition, the first processing station S ₁ Includes a half punching die 30 fixed to the lower die 1, and a counter punch 31 cooperating with the half punching punch 29 is disposed inside the half punching die 30. The counter punch 31 is a counter punch main body 31 having a cross section substantially the same as the outer shape of the metal element E. ₁ Counter punch body 31 ₁ A pair of counter punch half punched portions 31 that are disposed at both ends of the counter punch and are slightly movable up and down ₂ , 31 ₃ Counter punch body 31 ₁ In the center of the pin 29 ₄ Through-hole 31 formed to face the tip of ₄ With.
[0024]
Counter punch body 31 ₁ The cylinder 4 formed on the fixed base 4 ₁ And this cylinder 4 ₁ The counter punch main body 31 is fitted to the upper and lower slidable parts. ₁ Is urged upward by an urging means 34 comprising a piston 32 connected to the lower end thereof and a plurality of disc springs 33 urging the piston 32 upward. Also, a pair of counter punch half punched portions 31 ₂ , 31 ₃ Are biased upward by springs 35 and 36 disposed between the lower mold 1 and the lower mold 1.
[0025]
As shown in FIG. 7, when the upper die 7 is at the top dead center, the counter punch main body 31 urged upward by the urging means 34. ₁ Is located at the same height as the upper surface of the half punching die 30, and a pair of counter punch half punching portions 31 urged upward by springs 35 and 36, respectively. ₂ , 31 ₃ Is flush with the upper surface of the half punching die 30.
[0026]
Returning to FIG. 4, the second processing station S ₂ Is provided with a punching punch 37 which is fixed to the upper die 7 and slidably penetrates the pad 22. The lower die 1 below the punching punch 37 has an opening 1 extending therethrough. ₁ Is formed, opening 1 ₁ A conveyor 38 for conveying the metal elements E ... punched below is disposed.
[0027]
As is apparent from FIG. 6, the first processing station S ₁ Since the metal element E in the half-punched state protrudes downward from the lower surface of the metal coil material C, the metal coil material C is slightly removed from the upper surface of the lower mold 1 when the metal coil material C is conveyed forward by one pitch. Need to lift. Therefore, as shown in FIG. 7, the small diameter part 3 which supports the side edge of the metal coil material C is used. ₁ The provided guide rollers 3 are supported by the lower mold 1 so as to be movable up and down and are urged upward by springs 44. The metal coil material C of the lower mold 1 is placed when the guide rollers 3 are in the raised position. It can be lifted from the top.
[0028]
Next, the operation of the embodiment of the present invention having the above-described configuration will be described.
[0029]
In FIG. 2, the metal coil material C is intermittently conveyed by one pitch along the upper surface of the lower mold 1 with both side edges guided by guide members 2 and guide rollers 3. While the metal coil material C is stopped, the elevating base 6 moves down and ascends for one cycle with respect to the fixed base 4, that is, the elevating base 6 moves from the top dead center position (see FIG. 7) to the bottom dead center position (see FIG. 4), and the first machining station S while it rises again to the top dead center position. ₁ Guide hole C in the metal coil material C at the upstream position ₁ ... is drilled and the first processing station S ₁ The metal element E is punched from the metal coil material C in a half-punched state, and the second processing station S ₂ Thus, the semi-punched metal element E is completely punched from the metal coil material C. In FIG. 4, the metal element E completely punched from the metal coil material C is an opening 1 of the lower mold 1. ₁ Then dropped onto the conveyor 38 and discharged.
[0030]
Next, the first processing station S ₁ The operation of will be described in detail.
[0031]
When the lifting base 6 is at the top dead center shown in FIG. 7, the upper mold 7 and the slider 11 that are lifted and lowered integrally with the lifting base 6 are also at the top dead center, and the cam follower 11 provided at the end of the slider 11 ₁ Is the convex portion 17 of the cam member 17. ₁ The slider 11 moves to the left in the figure against the urging force of the urging means 12. Accordingly, the cam 11 formed on the upper surface of the slider 11. ₂ ... Cam follower 10 of pressure plate 10 in the valley between ₁ , And the pressure plate 10 urged by the four urging means 18, together with the pad 22 integral therewith, is lowered relative to the upper mold 7, and as a result, the elevating base 6 There is a gap between the lower surface of the plate and the pressure plate 10.
[0032]
When the upper die 7 is lowered together with the elevating base 6 from this state, the cam follower 11 of the slider 11 descending together with the upper die 7. ₁ The urging force of the urging means 12... ₁ To recess 17 ₂ And the slider 11 moves to the right in FIG. As a result, the cam 11 formed on the upper surface of the slider 11. ₂ ... to Cam Follower 10 ₁ The pressure plate 10 pushed up is raised against the urging force of the urging means 18 and finally the cam 11 of the slider 11 ₂ The top surface of the cam follower 10 of the pressure plate 10 ₁ Get on top of…. In this state, the pressure plate 10 is fixed to the slider 11 and the lift base 6 so as not to be lifted and, therefore, the pad 22 integral with the pressure plate 10 is fixed to the upper mold 7 integral with the lift base 6, The lower surface of the pad 22 is locked at a position raised relative to the tip of the half punching punch 29.
[0033]
FIG. 9 shows a state when punching is started, and the metal coil material C pressed against the tip of the half-punching punch 29 is pushed down from a state where the metal coil material C is lifted from the lower die 1 (see FIG. 7). 1. Abutting on the upper surface of the half punching die 30 and the counter punch.
[0034]
When the elevating base 6 is further lowered and reaches the bottom dead center, as shown in FIG. 6, the metal element E is punched out of the metal coil material C in a half punched state by the half punching punch 29 and the half punching die 30. . That is, the counter punch main body 31 in a state in which the periphery of the metal element E is sandwiched between the half punching die 30 and the pad 22. ₁ While the punch body 29 is lowered against the urging force of the urging means 34. ₁ And counter punch body 31 ₁ The metal element E sandwiched between the pins 29 is punched out so as to have a precise shearing surface, and at the same time the pin 29 ₄ And through hole 31 ₄ And a hollow projection E on the metal element E ₃ (See FIG. 12) are formed integrally.
[0035]
At this time, the punch body 29 ₁ Punch half-punched part 29 slightly retracted relative to ₂ , 29 ₃ Counter punch body 31 ₁ Counter punch half-punched part 31 formed separately from ₂ , 31 ₃ 2 parts of the metal element E are punched incompletely, and there are two bridge parts E ₁ , E ₂ (See FIG. 12) is formed. Thus, in this first step, as shown in FIG. 11 (A), the half-punched metal element E is extruded downward from the metal coil material C, and the bridge portion E ₁ , E ₂ Thus, the metal coil material C is connected.
[0036]
Subsequently, as shown in FIG. 10, when the elevating base 6 is raised, the pad 22 is not raised, and the metal coil material C is sandwiched and fixed between the pad 22 and the lower mold 1. When only the metal element E sandwiched between the counter punch 31 and the half punch 29 is raised, the metal element E sheared from the metal coil material C and pushed downward is pushed back to the original position, and the bridge portion E ₁ , E ₂ May be deformed and the punching accuracy may be reduced.
[0037]
However, according to the present embodiment, the cam 11 of the slider 11 is used. ₂ The top surface of the cam follower 10 of the pressure plate 10 ₁ Since the pad 22 is locked to the half punching punch 29 by the contact with the top surface of ... and rises integrally, in this second step, as shown in FIG. Metal element E is bridge part E ₁ , E ₂ Without being deformed, the counter punch 31 is pushed in the shape as it is and is lifted from the lower die 1. As for the rise of the metal coil material C and the metal element E, the metal coil material C is reduced in the small diameter portion 3 of the guide roller 3 ₁ However, the pad 22 and the half punching punch 29 are further raised and separated from the metal coil material C and the metal element E as shown in FIG.
[0038]
When the elevating base 6 further rises and approaches the top dead center shown in FIG. 7, the cam follower 11 of the slider 11. ₁ Is the recess 17 of the cam member 17. ₂ To convex part 17 ₁ Along the cam follower 10 of the pressure plate 10. ₁ ... is the cam 11 of the slider 11 ₂ The pressure plate 10 is lowered by the urging force of the urging means 18. As a result, in the third step shown in FIG. 11D, the pad 22 descends relative to the half punching punch 29, and the metal coil material C and the metal element E are removed from the pad 22 and the half punching punch 29. In order to completely separate them, the metal coil material C and the metal element E are connected to the second processing station S. ₂ It will be able to move toward.
[0039]
Thus, the cam follower 11 of the slider 11 ₁ A first cam mechanism including the cam member 17 and the cam 11 of the slider 11. ₂ ... and cam follower 10 of pressure plate 10 ₁ It is possible to arbitrarily set the raising / lowering timing of the pad 22 with respect to the above-described upper mold 7 only by changing the shape of the second cam mechanism.
[0040]
While the elevating base 6 is stopped at the top dead center, the metal coil material C is conveyed by one pitch as shown in FIG. ₂ The half-punched metal element E that has reached is completely punched by the descending punch 37 for lowering and falls onto the conveyor 38. In this way, the second processing station S ₂ Then, since the metal element E can be punched and dropped from the metal coil material C with only the punching punch 37 without using a counter punch, it is not necessary to blow and discharge the metal element E by air blow in 1 second. High-speed machining can be performed with a cycle time of 5 to 6 times.
[0041]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0042]
For example, in the embodiment, the punching process of the metal element E of the belt type continuously variable transmission is exemplified, but the present invention can be applied to the punching process of any other product of the present invention.
[0043]
【The invention's effect】
As described above, according to the invention described in claim 1, since the metal coil material is sandwiched from above and below by the punch and the counter punch at the first processing station and the product is punched in a semi-punched state, the punching accuracy can be improved. it can. Further, since the half-punched product can be punched out without using a counter punch and dropped by gravity at the second processing station, it is not necessary to blow off the product by air blow and the cycle time can be shortened. it can. Further, in the second step of lifting the product punched out in the first step from the lower mold in the second step, the pad is integrally joined with the punch and the pad is lifted together with the metal coil material. Only the product is prevented from rising while being pressed downward, and there is no possibility that the bridge portion connecting the product to the metal coil material is deformed and the punching accuracy is not lowered. Moreover, since the pad is lowered relative to the punch in the third step, the product can be separated from the punch, and the product and the metal coil material can be conveyed to the second processing station.
[0044]
According to the invention described in claim 2, the slider moves horizontally by the first cam mechanism as the upper mold moves up and down, and the pressure plate moves up and down by the second cam mechanism as the slider moves horizontally. A pad coupled to the pressure plate moves up and down relative to the upper die, that is, relative to the punch. As a result, the pad is coupled to a position raised relative to the punch while the upper mold is lowered, and the coupling of the pad and the punch is released while the upper mold is lifted, and the biasing force of the biasing means The pad can be lowered relative to the punch. Thus, the relative position of the pad with respect to the punch can be easily and arbitrarily set only by changing the cam shapes of the first cam means and the second cam means.
[Brief description of the drawings]
FIG. 1 is an overall plan view of a fine blanking device.
2 is an enlarged view of the main part of FIG. 1 (viewed along line 2-2 in FIG. 4).
3 is a sectional view taken along line 3-3 in FIG.
4 is a cross-sectional view taken along line 4-4 of FIG. 1 (at bottom dead center).
5 is a cross-sectional view taken along line 5-5 in FIG. 1 (at bottom dead center).
6 is an enlarged view of the main part of FIG.
FIG. 7 is an operation explanatory diagram showing a state at the top dead center.
FIG. 8 is an operation explanatory diagram showing a state at the start of punching.
9 is an enlarged view of the main part of FIG.
FIG. 10 is an operation explanatory diagram showing a state of rising after punching.
FIG. 11 is a process diagram of this example.
FIG. 12 is a perspective view of a metal element.
[Explanation of symbols]
C Metal coil material
E Metal element (product)
E ₁ , E ₂ Bridge part
S ₁ First processing station
S ₂ Second processing station
7 Upper mold
10 Pressure plate
10 ₁ Cam follower (second cam mechanism)
11 Slider
11 ₁ Cam follower (first cam mechanism)
11 ₂ Cam (second cam mechanism)
17 Cam member (first cam mechanism)
18 Energizing means
22 pads
29 Punch for half punching
30 Die for half punching (die)
31 Counter punch

Claims (2)

While the metal coil material (C) is intermittently conveyed at a predetermined pitch in the longitudinal direction, a part of the product (E) is made of the metal coil material (C) at the first processing station (S ₁ ) provided on the upstream side in the conveyance direction. ) In the half-punched state connected by the bridge portions (E ₁ , E ₂ ), and the half-punched product (E ₂ ) in the second processing station (S ₂ ) provided downstream in the conveying direction. ) Is a fine blanking method for performing a complete punching process of completely punching a metal coil material (C),
The semi-punching process includes
A punch (29) provided on the upper die (7) and a pad (22) integrally coupled to the punch (29) are provided, and a die (30) provided on the lower die (1) and the die (30) are provided. A first step of punching the product (E) from the metal coil material (C) in a half-punched state by lowering the counter punch (31) slidably penetrating and biased upward;
A product (E) sandwiched between the punch (29) and the counter punch (31) by raising the punch (29) and the pad (22) which are integrally joined and being clamped by the upward biasing force of the counter punch (31) is a metal coil. A second step of lifting from the die (30) together with the material (C);
While further raising the pad (22) and punch (29), releasing the coupling of the pad (22) and punch (29) and lowering the pad (22) relative to the punch (29), A third step of separating the product (E) from the punch (29);
Fine blanking method characterized by performing. A fine blanking device for performing a half punching process in the fine blanking method according to claim 1,
A slider (11) supported horizontally on the upper mold (7);
A pressure plate (10) supported to be movable up and down with respect to the upper mold (7) and coupled to the pad (22);
Biasing means (18) for biasing the pressure plate (10) downward toward the slider (11);
A first cam mechanism (11 ₁ , 17) that horizontally moves a slider (11) that moves up and down with the upper mold (7) as the upper mold (7) moves up and down;
A second cam mechanism (10 ₁ , 11 ₂ ) provided between the pressure plate (10) and the slider (11);
With
The second cam mechanism (10 ₁ , 11 ₂ ) moves the pressure plate (10) and the pad (22) relative to the punch (29) by the horizontal movement of the slider (11) as the upper die (7) is lowered. And the biasing means (18) by releasing the connection of the pressure plate (10) and the pad (22) by the horizontal movement of the slider (11) as the upper die (7) is raised. The fine blanking device is characterized in that the pad (22) is lowered relative to the punch (29) by the urging force.

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