JP6898612B2 - Manufacturing method of stamped products - Google Patents

Description

The present invention relates to a method for manufacturing a pressed product, which obtains a pressed product by molding a plate to be processed into a predetermined shape by punching.

As shown in FIGS. 7A and 7B, openings 101 and 102 are formed in order in the plate 100 to be processed by punching with a press processing machine, and the remaining portion 103 is formed between the openings 101 and 102. Due to shear deformation, the remaining portion 103 is twisted toward the punched opening 102 after the opening 101. The helix angle θ of the remaining portion 103 increases as the relative size (W / T) of the width W (interval between the openings 101 and 102) of the remaining portion 103 with respect to the thickness T of the plate to be processed becomes smaller.

As a method of reducing the twist of the remaining portion 103, it is conceivable to simultaneously punch out the openings 101 and 102 with respect to the plate 100 to be processed in a state where the region to be formed of the remaining portion 103 is sandwiched and fixed from above and below. However, in this method, if the machined portion is fine, it becomes difficult to arrange a tool that sandwiches the region to be formed of the remaining portion 103 from above and below, and there is a practical limit in machining.
Further, Non-Patent Document 1 describes that by repeating the shaving process a plurality of times to form an opening, the area punched at one time is reduced, and as a result, the deformation generated in the remaining portion of the plate to be processed is reduced. Has been done.

Masahiro Sasada, Takao Kaburagi, Isamu Aoki "Basic Research on Overtaking Shear" Plasticity and Machining (Journal of the Japan Society for Plasticity Machining) Vol. 44, No. 504 (2003-1), P40-44

However, Non-Patent Document 1 does not specifically mention how the shaving process can be performed to stably suppress the deformation of the remaining portion.
Further, originally, the shaving process is for preparing the sheared surface neatly, and the removal allowance of the plate to be processed by one shaving process is 10% or less of the thickness of the plate to be processed. Therefore, for example, in order to form an opening having a predetermined size in the plate to be processed, a large number of shaving processes are required, which causes an increase in the number of processing steps and an increase in chips generated. ..
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing a pressed product, which suppresses an increase in the number of processing steps and an increase in chips and reduces twisting generated in a plate to be processed. And.

The method for producing a pressed product according to the first invention according to the above object is a method for producing a pressed product in which a plate to be processed having a thickness t is provided with a remaining portion punched on the positive side and the negative side in the X direction by pressing. A step of punching the plate to be processed to form a punching space at a position away from the planned formation region of the remaining portion in the X direction, and between the punching space and the planned formation region of the remaining portion. It has a step B in which the remaining portion is provided by punching n times with a punching width of Δ on the positive side in the X direction, and Δ / t is 0. It is 4 or more and 0.6 or less.

In the method for producing a stamped product according to the first invention, n = 1 is preferable.

In the method for producing a stamped product according to the first invention, it is preferable that w / t is more than 0 and 1.5 or less, where w is the width of the remaining portion in the X direction.

The method for producing a stamped product according to the second invention according to the above object is to have a first residual portion punched on a plate to be processed having a thickness t by a press on the positive side and the negative side in the X direction, and the positive side in the X direction. In a method for manufacturing a stamped product in which the side and the negative side are punched out and a second residual portion is provided at a position separated from the first residual portion on the positive side in the X direction, the plate to be processed is punched out. , A punching space is formed at a position separated from the planned formation region of the first remaining portion on the positive side in the X direction and at a position separated from the planned formation region of the second remaining portion on the negative side in the X direction. In step A, the punching space and the planned formation region of the first remaining portion are punched M times on the negative side in the X direction with a punching width of Δ1, and the punching space and the planned formation region of the second remaining portion are punched M times. There is a step B in which the space is punched N times on the positive side in the X direction with a punching width of Δ2 to provide the first and second remaining portions, and Δ1 / t and Δ2 / t are 0. 4 or more and 0.6 or less

In the method for producing a pressed product according to the second invention, M = N = 1, punching between the punching space and the planned formation region of the first remaining portion, and punching space and the second remaining portion. It is preferable to simultaneously perform punching between the areas where the portions are to be formed.

In the method for producing a stamped product according to the second invention, w1 / t and w2 / t exceed 0 and 1.5, respectively, assuming that the widths of the first and second remaining portions in the X direction are w1 and w2, respectively. The following is preferable.

In the method for producing a pressed product according to the first and second inventions, the punching space can be a through hole.

The method for manufacturing a stamped product according to the first invention includes a step A of punching a plate to be processed to form a punching space at a position away from the planned formation region of the remaining portion in the X direction, and a punching space and a residual portion. It has a step B of punching n times between the planned formation regions of the portions with a punching width of Δ on the positive side in the X direction to provide a remaining portion, and Δ / t is 0. It is 4 or more and 0.6 or less. Then, in the method for manufacturing a stamped product according to the second invention, the plate to be processed is punched out, and the position is separated from the planned formation region of the first remaining portion on the positive side in the X direction, and the second remaining portion is formed. Step A of forming a punching space at a position away from the planned formation region on the negative side in the X direction, and punching M times between the punching space and the planned formation region of the first remaining portion on the negative side in the X direction with a punching width of Δ1. It has a step B of punching N times between the punching space and the planned formation region of the second remaining portion with a punching width of Δ2 on the positive side in the X direction to provide the first and second remaining portions, and Δ1 /. t and Δ2 / t are 0. It is 4 or more and 0.6 or less.
Therefore, in the method for producing a pressed product according to the first and second inventions, it is possible to suppress an increase in the number of processing steps and an increase in chips and reduce twisting generated in the remaining portion.

It is explanatory drawing of the plate to be processed to which the manufacturing method of the stamped product which concerns on 1st Embodiment of this invention is applied, and the pressed product obtained by the manufacturing method. It is explanatory drawing which shows the state of punching a plate to be processed by the manufacturing method of the press-processed product. (A) and (B) are explanatory views which show how the plate to be processed is punched by the manufacturing method of the press-processed product, respectively. It is explanatory drawing which shows the state of punching a plate to be processed by the manufacturing method of the pressed product which concerns on 2nd Embodiment of this invention. It is a graph which shows the helix angle which occurs in the residual part and the temporary residual part under each punching condition. It is a graph which shows the helix angle of the remaining part under each punching condition, and the increase of the helix angle by the second punching. Each of (A) and (B) is an explanatory view showing a plate to be machined which has been punched in a conventional manner.

Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood.
As shown in FIGS. 1, 2, 3 (A) and 3 (B), the method for manufacturing a pressed product according to the first embodiment of the present invention is to press a plate 10 having a thickness t. , A manufacturing method for manufacturing a pressed product 12 by providing a remaining portion 11 punched out on the positive side and the negative side in the X direction, in which the plate 10 to be machined is punched and a region to be formed of the remaining portion (hereinafter, “residual”). Step A of forming the punching space 14 at a position away from the planned area 13 on the negative side in the X direction, and n times between the punching space 14 and the remaining planned area 13 on the positive side in the X direction with a punching width of Δ. (N is a natural number) has a step B of punching and providing the remaining portion 11.

In the present embodiment, as shown in FIG. 1, the plate 10 to be processed is a rectangular metal plate, and is a pressed product 12 in which a plurality of openings 15 are formed by punching with a press processing machine. The openings 15 are long in the direction orthogonal to the X direction and are formed at a predetermined pitch in the X direction. The pressed product 12 is provided with a remaining portion 11 which is long in the direction orthogonal to the X direction and has a width in the X direction between adjacent openings 15. In the present embodiment, the transport direction of the work piece 10 is opposite to the X direction.

As shown in FIGS. 2 and 3A, the press working machine for punching the work plate 10 intermittently punches the punches 17 and 18 for punching the work plate 10 and the work plate 10 on the negative side in the X direction. It is equipped with a transport mechanism for transporting the target. The punch 18 is provided at a position having a distance from the punch 17 on the negative side in the X direction, and the press processing machine punches the plate 10 to be processed by the punches 17 and 18 at the timing when the plate 10 to be processed is stopped.

In order to provide the remaining portion 11 on the work plate 10 that has not been punched, first, as shown in FIG. 2, the work plate 10 supported from above and below by a stripper plate and a die 16 (not shown) is placed in the X direction. Punch with a punch 17 whose width is narrower than the opening 15. By punching the punch 17, as shown in FIG. 3A, the plate 10 is X at a position having a distance of D to the remaining planned region 13 (width in the X direction is w) on the positive side in the X direction. A punching space 14 having a direction width narrower than w (that is, the width of the opening 15 in the X direction) is formed.

By repeating punching by the punch 17 and conveying the plate 10 to be processed, a plurality of punching spaces 14 are formed in the plate 10 to be processed at intervals in the X direction.
In the present embodiment, the punching space 14 is a rectangular through hole long in the direction orthogonal to the X direction, and is formed at a position having no distance to the remaining planned region 13 on the negative side in the X direction.

Then, the forming region of the punching space 14 of the plate 10 to be machined is conveyed to the arrangement position of the punch 18, and the region close to the punching space 14 is punched by the punch 18. Similar to punching with the punch 17, punching with the punch 18 is performed with the plate 10 to be processed sandwiched from above and below by a stripper plate and a die (not shown).
As shown in FIG. 3A, the punch 18 is arranged at a position where the entire region between the punching space 14 of the plate 10 to be machined and the planned remaining area 13 is punched, and the punch 18 is punched into the plate 10 to be machined. Is formed with a punching space 19 connected to the punching space 14.

As shown in FIG. 3B, a plurality of openings 15 are formed in the plate 10 to be processed at intervals in the X direction by repeating punching by the punch 18 and conveying the plate 10 to be processed, and adjacent openings 15 are formed. A remaining portion 11 is provided between each of the above.
In the present embodiment, the space between the punching space 14 and the planned remaining area 13 is punched once on the positive side in the X direction to provide the remaining portion 11, and n = 1. Then, in the present embodiment, Δ = D, where Δ is the extraction width in the X direction between the extraction space 14 by the punch 18 and the planned remaining area 13.

Here, the press processing machine is designed so that Δ / t is 0.2 or more and 0.6 or less. Therefore, as compared with the case where Δ / t is 0.1 or less, the number of punches of the work plate 10 required to form the opening 15 in the work plate 10 and the number of chips generated by the punching are reduced. Can be done.
Further, the chips generated when punching between the punching space and the planned remaining area increase as the value of Δ / t increases, and the larger the chips, the less likely they are to be adsorbed by the punch. Adsorption of chips to the punch causes defects and the like in the pressed product. Therefore, from the viewpoint of suppressing the occurrence of defects in the pressed product, Δ / t is preferably 0.4 or more and 0.6 or less.

Then, in the present embodiment, w / t is more than 0 and 1.5 or less, the width w of the remaining portion 11 in the X direction with respect to the thickness t of the plate 10 to be processed is small, and the opening 15 is formed by one punching. If this is the case, it is presumed that a large helix angle is generated in the remaining portion 11. In this respect, in the present embodiment, the opening 15 is formed by punching twice, and since 0.2 ≦ Δ / t ≦ 0.6, the helix angle generated in the remaining portion 11 can be stably adjusted. It can be reduced.
In the present embodiment, the remaining portion is formed by using two punches, but it goes without saying that the remaining portion may be formed by using only one punch. When only one punch is used, the punching space is formed by the first punching, and then the plate to be machined is fed by Δ, and then the second punching is performed.

In the first embodiment described so far, the punching space is formed at a position having no distance to the remaining planned region on the negative side in the X direction, but the punching space is not limited to this, and the punching space is set on the positive side in the X direction. It may be formed at a position having a distance from each of the planned remaining area and the planned remaining area on the negative side in the X direction.
Hereinafter, a method for manufacturing a pressed product according to the second embodiment, in which the punching space is formed at a position having a distance from each of the planned remaining area on the positive side in the X direction and the planned remaining area on the negative side in the X direction, will be described. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the method for manufacturing a pressed product according to the second embodiment, as shown in FIG. 4, the remaining portion 31 (the first) in which the positive side and the negative side in the X direction are punched into the plate 10 to be processed having a thickness t by a press. 1) and a residual portion 32 (second residual portion) in which the positive and negative sides in the X direction are punched out and arranged at positions separated from the residual portion 31 on the positive side in the X direction. , The plate 10 to be processed is punched out, and the position away from the planned formation region of the remaining portion 31 (hereinafter referred to as “remaining planned region 33”) on the positive side in the X direction and the planned formation region of the remaining portion 32 (hereinafter, referred to as The step A of forming the punching space 35 at a position away from the planned remaining area 34 on the negative side in the X direction, and the punching width of Δ1 on the negative side in the X direction between the punching space 35 and the planned remaining area 33. It has a step B of punching M times between the punching space 35 and the planned remaining area 34 N times with a punching width of Δ2 on the positive side in the X direction to provide the remaining portions 31 and 32, and Δ1 / t and Δ2 /. t is 0.2 or more and 0.6 or less.

In the press processing machine used in the present embodiment, as shown in FIG. 4, the plate 10 to be processed is intermittently conveyed to the negative side in the X direction, and the punches 36 and 37 arranged at intervals in the X direction are used. , The work plate 10 is punched out at the timing when the work plate 10 is stopped.
By punching with the punch 36, a punching space 35 (through hole in the present embodiment) is formed in the plate 10 to be machined at a position having a distance from the planned remaining areas 33 and 34 between the planned remaining areas 33 and 34. To. By repeating punching by the punch 36 and conveying the plate 10 to be processed, the plate 10 to be processed is provided with a plurality of punching spaces 35 at intervals in the X direction.

The punch 37 has a larger punching area than the punch 36, and the plate 10 on which the punching space 35 is formed is conveyed to a position where the center of the punching space 35 is arranged directly below the center of the punch 37, and the punching space 35 is formed. The entire outer circumference of the is punched by the punch 37. By punching with the punch 37, an opening 38 larger than the punching space 35 is formed in the plate 10 to be processed.
In the present embodiment, punching between the punching space 35 and the planned remaining area 33 and punching between the punching space 35 and the planned remaining area 34 are performed at the same time.

Assuming that the distance from the punching space 35 to the planned remaining area 33 is D1 and the distance from the punching space 35 to the planned remaining area 34 is D2, the punch 37 punches and punches the negative side of the punching space 35 in the X direction with the punching width of D1. The negative side of the space 35 in the X direction is punched out with the punching width of D2. Therefore, Δ1 = D1, Δ2 = D2, and M = N = 1.
The press working machine used in the present embodiment is designed so that Δ1 / t and Δ2 / t are 0.2 or more and 0.6 or less, and one or both of Δ1 / t and Δ2 / t. Compared with the case where the value is 0.1 or less, the number of punches of the plate 10 to be processed required to form the opening 38 in the plate 10 to be processed and the number of chips generated by the punching can be reduced.
From the viewpoint of reducing the size of chips and suppressing the adsorption of chips to the punch, it is preferable that Δ1 / t and Δ2 / t are 0.4 or more and 0.6 or less.

Further, since the widths of the remaining portions 31 and 32 in the X direction are w1 and w2, respectively, and w1 / t and w2 / t are more than 0 and 1.5 or less, respectively, the opening 38 is tentatively formed by one punching. In that case, it is presumed that a large helix angle is generated in the remaining portion 11. In this respect, in the present embodiment, since the individual openings 15 are formed by punching twice and Δ1 / t and Δ2 / t are 0.2 or more and 0.6 or less, the remaining portions 31, 32. It is possible to stably reduce the helix angle that occurs in.

Next, an experiment conducted to confirm the action and effect of the present invention will be described.
In the experiment, SUS304 CSP 3/4 HTA having a plate thickness t of 0.25 mm, a uniform elongation of 5.0%, and a total elongation of 29.7% was used as the plate to be processed. Then, with the plate to be processed pressed against the die at 2.0 kN by the stripper plate, the plate to be processed is punched with a punch of 12.5 μm, which has a clearance of 5% of the plate thickness, to open openings at intervals. A remaining portion having a width w of 0.25 mm was provided between the openings (that is, w / t = 1), and the helix angle of the remaining portion was measured.

The opening is formed by one or two punching, and the pattern of performing two punching is that the through hole (punching space) formed by the first punching is widened to one side by the second punching. Was formed. In the pattern of performing two punches, the helix angle of the area remaining next to the through hole of the work material (hereinafter, also referred to as "temporary residual portion") is measured when the through hole is formed by the first punching. did.
The punching conditions for each pattern are shown below. In addition, k is the number of punching performed until the opening is provided. D is the distance from the through hole formed in the first punching in the experiment of k = 2 to the planned remaining region, which is equal to the punching width Δ in the second punching.
(1): k = 1
(2): k = 2, D / t = 0.2
(3): k = 2, D / t = 0.4
(4): k = 2, D / t = 0.6
(5): k = 2, D / t = 0.8
(6): k = 2, D / t = 1

The experimental results are shown in FIGS. 5 and 6.
In FIG. 5, the x and white marks indicate the helix angle θ (°) of the remaining portion, and the filled marks indicate the helix angle θ (°) of the temporary remaining portion. The horizontal axis of FIG. 5 is 1 + D / t, which is the value obtained by dividing the width (= w + D) of the temporary residual portion by t.
From the result shown in FIG. 5, when 1 + D / t is 1.5 or less, the increase in the helix angle of the temporary residual portion with respect to the decrease in 1 + D / t becomes remarkable. Therefore, assuming that the temporary remaining portion is regarded as the remaining portion, when the opening is formed by one punching, if the value obtained by dividing the width of the remaining portion by t is 1.5 or less, the helix angle of the remaining portion becomes large. I was able to confirm that.

In FIG. 6, the white mark is the helix angle θ (°) of the remaining portion, the filled mark is the angle δ (°) obtained by subtracting the helix angle of the temporary remaining portion from the helix angle of the remaining portion, and the horizontal axis is Δ / t. (D / t) are shown respectively. The broken line in FIG. 6 indicates the helix angle of the remaining portion formed by the first punching.
From the result shown in FIG. 6, by adjusting the punching so as to be in the range of 0.2 ≦ Δ / t ≦ 0.6 in the two punches and providing the remaining part, the remaining part can be obtained by the one punching. It was confirmed that the helix angle of the remaining portion can be stably reduced as compared with the provision.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions that do not deviate from the gist are within the scope of the present invention.
For example, n, M, and N do not have to be 1, and may be n ≧ 2, M ≧ 2, and N ≧ 2. When n = 2, the punching space expands to the positive side in the X direction by the first punching between the punching space and the remaining planned area, and the punching space is expanded by the second punching between the punching space and the remaining planned area. Further, it spreads to the positive side in the X direction to form an opening.
And it is not necessary that M = N.

Further, the cutout space formed in step A does not have to be a through hole, and may be, for example, a notch.
The present invention can also be applied to a plate to be processed in which w / t, w1 / t, and w2 / t exceed 1.5.
Further, the negative side in the X direction does not have to be the feed direction of the plate to be processed, and for example, the X direction may be a direction orthogonal to the feed direction of the plate to be processed or a direction inclined with respect to the feed direction of the plate to be processed. ..

10: Plate to be processed, 11: Remaining part, 12: Pressed product, 13: Remaining planned area, 14: Punching space, 15: Opening, 16: Die, 17, 18: Punch, 19: Punching space, 31, 32 : Remaining part, 33, 34: Remaining planned area, 35: Punching space, 36, 37: Punch, 38: Opening

Claims (7)

In a method for manufacturing a pressed product, in which a plate to be processed having a thickness t is provided with a remaining portion punched on the positive and negative sides in the X direction by pressing.
A step A of punching the plate to be processed to form a punching space at a position away from the planned formation region of the remaining portion on the negative side in the X direction.
It has a step B of providing the remaining portion by punching n times between the punching space and the planned formation region of the remaining portion with a punching width of Δ on the positive side in the X direction.
Δ / t is 0. A method for manufacturing a stamped product, which is characterized by being 4 or more and 0.6 or less. The method for producing a stamped product according to claim 1, wherein n = 1. The production of a stamped product according to claim 1 or 2, wherein w / t is more than 0 and 1.5 or less, where w is the width of the remaining portion in the X direction. Method. The first residual portion in which the positive and negative sides in the X direction are punched out and the positive and negative sides in the X direction are punched in the plate to be processed having a thickness t by pressing, and the positive side in the X direction is punched from the first residual portion in the X direction. In a method for manufacturing a stamped product, which is provided with a second remaining portion arranged at a position separated from the side.
The plate to be processed is punched out at a position separated from the planned formation region of the first remaining portion on the positive side in the X direction, and separated from the planned formation region of the second remaining portion on the negative side in the X direction. Step A to form a punching space at the position,
The space between the punched space and the planned formation region of the first remaining portion is punched M times on the negative side in the X direction with a punching width of Δ1, and the space between the punched space and the planned formation region of the second remaining portion is described. It has a step B of punching N times with a punching width of Δ2 on the positive side in the X direction to provide the first and second remaining portions.
Δ1 / t and Δ2 / t are 0. A method for manufacturing a stamped product, which is characterized by being 4 or more and 0.6 or less. In the method for producing a stamped product according to claim 4, M = N = 1, punching between the punching space and the planned formation region of the first remaining portion, and punching space and the second remaining portion. A method for manufacturing a stamped product, which comprises simultaneously punching between regions to be formed. In the method for producing a stamped product according to claim 4 or 5, w1 / t and w2 / t exceed 0, respectively, assuming that the widths of the first and second remaining portions in the X direction are w1 and w2, respectively. A method for manufacturing a stamped product, which is characterized by being 5 or less. The method for manufacturing a stamped product according to any one of claims 1 to 6, wherein the punching space is a through hole.

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