KR20240028673A - Shear surface processing method of sheet material using press and extrusion molding - Google Patents

Abstract

The present invention relates to a method for processing the front surface of a sheet using press shearing and extrusion molding, and a processing device for the same. It is a method that combines the half-blanking method and the extrusion molding method in a general press by applying the reverse clearance of the die and punch, thereby improving the product quality of the front surface. In addition to maintaining the surface of the die during molding by rounding and finely tapering the edge of the die, the occurrence of fractured surfaces is suppressed, and the shear surface is favorably generated to ensure excellent quality due to increased surface roughness on the shear surface. Step (S1) of horizontally seating the plate material 10, which is a workpiece, on the upper surface of the structured die 50 and the support pad 30; A guide plate 60 is provided on the upper part of the die 50 to be spaced apart, and a guide plate 60 is provided on the upper part of the support pad 30 to be 6 to 15% of the thickness t of the plate 10 than the plate penetration inner diameter of the die 50. Step (S2) of spaced apart pressing punches 40 having a width as large as the first spacing w1; A step (S3) of vertically moving the pressing punch 40 toward the plate 10 and leaving a connecting bar 72 as long as the second interval w2 of 6 to 15% of the thickness t of the plate 10 (S3). ); A used plate 10a is positioned on the upper surface of the support pad 30 centered on the connecting rod 72, and a removal plate 10b is positioned on the upper surface of the die 50, and the plate 10 is After horizontally seating the die 50 and the upper surface of the ejector 32, the cutting punch 42 provided on the top of the ejector 32 is vertically moved to cut the connecting rod 72 to remove the plate 10b. Step (S4) of disengaging the used plate (10a) connected to; The used plate 10a is horizontally seated on the upper surface of the rounding die 54 that has been treated with corner rounding (r2), and then a rounding forming punch is provided spaced apart from the upper part of the rounding die 54 and processed with corner rounding (r3). It is characterized by including a step (S5) of rounding the upper and lower corners of the used plate (10a) by vertically moving (44).

Description

Shear surface processing method of sheet material using press and extrusion molding}

The present invention relates to a method of processing the shear surface of a sheet using press shearing and extrusion molding. More specifically, the present invention relates to a method of processing the shear surface of a plate using a reverse clearance of a die and a punch, and is a method that combines the half-blanking method and the extrusion molding method in a general press by applying the reverse clearance of the die and the punch to produce the shear surface product. In addition to maintaining quality, the occurrence of fractured surfaces is suppressed by rounding and finely tapering the blade surface of the die during molding, and the occurrence of shear surfaces is favored to ensure excellent quality due to increased surface roughness on the shear surfaces. and a method for processing the front surface of a plate using extrusion molding.

In general, fine blanking processing can be said to be a type of press processing that forms a shear surface over the entire thickness of the material. This type of fine blanking is known to have significant advantages over general blanking, in which fracture occurs in some parts of the product, as it can produce products with not only good flatness of the material but also a good cutting surface by shearing plate-shaped materials. .

However, the fine blanking process had the problem of requiring excessive investment costs due to the high cost burden of press equipment and mold production.

Meanwhile, Figure 1 shows a shear mold machining process using a general press. In more detail, an example diagram showing a state in which a shear surface and a fracture surface are generated on the edge of a product in a shear mold processing process according to the prior art is shown. Looking at this, shear mold processing for the plate 110, which is a workpiece, is shown. In the process, the upper and lower surfaces of the removed plate 110b, which is the edge of the plate 110, are closely fixed with the guide plate 122 and the die 124, and the punch 121 is vertically moved downward toward the ejector 123. The plate material 110a is cut on the plate 110.

At this time, since the structure of the shear mold processing process consists only of cutting, the plate 110 is divided into a used plate 110a and a removed plate 110b, and a shear surface 112 and a burr 114 are formed on the opposing cutting surfaces. ), etc., are bound to occur at the same time, and as a result, a separate end mill process and finishing process must be performed to improve the quality of the used plate (110a), which increases the overall production time and production cost. There was a problem of low efficiency.

In addition, even if the post-processing end mill process and finishing process were performed, there was a problem in that it was difficult to ensure consistent quality of the shear surface due to the nature of most of them being performed manually.

Publication Patent No. 10-2015-0102366

Accordingly, the present invention was created to eliminate the above-mentioned problems. By applying the reverse clearance of the die and punch, the product quality of the front surface is maintained through a method that combines the half-blanking method and the extrusion molding method in a general press. The shear surface of a sheet material using press shearing and extrusion molding, which suppresses the occurrence of fracture surfaces by rounding and finely tapering the blade surface of the die, and facilitates the occurrence of shear surfaces to ensure excellent quality due to increased surface roughness on the shear surface. It was completed as a technical task, focusing on the processing method.

The present invention for achieving the above technical problem includes the step (S1) of horizontally seating a plate 10, which is a workpiece, on the upper surface of the press-structured die 50 and the support pad 30; A guide plate 60 is provided on the upper part of the die 50 to be spaced apart, and a guide plate 60 is provided on the upper part of the support pad 30 to be 6 to 15% of the thickness t of the plate 10 than the plate penetration inner diameter of the die 50. Step (S2) of spaced apart pressing punches 40 having a width as large as the first spacing w1; A step (S3) of vertically moving the pressing punch 40 toward the plate 10 and leaving a connecting thread 72 as long as the second interval w2 of 6 to 15% of the thickness t of the plate 10 (S3). ); A used plate 10a is positioned on the upper surface of the support pad 30 centered on the connecting spoke 72, and a removal plate 10b is positioned on the upper surface of the die 50, and the plate 10 is After horizontally seating the die 50 and the upper surface of the ejector 32, the cutting punch 42 provided on the top of the ejector 32 is vertically moved to cut the connecting rod 72 to remove the plate 10b. Step (S4) of disengaging the used plate (10a) connected to; The used plate 10a is horizontally seated on the upper surface of the rounding die 54 that has been subjected to corner rounding (r2), and then a rounding forming punch is provided spaced apart from the upper part of the rounding die 54 and treated with corner rounding (r3). (44) is vertically moved to round the upper and lower corners of the used plate (10a) (S5); a shear surface processing method of a plate using press shear and extrusion molding is provided. .

In addition, in step S3, with the bottom edge of the used plate 10a and the inner edge of the die 50 in close contact to form a contact point (p), centering on the contact point (p) An inclination angle (θ) is formed to create a gap of 0.5 to 1.5% of the thickness (t) of the plate 10 between the edge of the upper surface of the die 50 and the front surface of the used plate 10a located on the horizontal line. It is characterized by .

In addition, in the S1 step, the inner edge of the die 50 where the contact point (p) is located is rounded (r1) to prepare the die 50, and then pressed with the pressing punch 40 in the S3 step. It is characterized by performing.

According to the present invention described above, the product quality of the front surface is maintained through a method that combines the half-blanking method and the extrusion method in a general press by applying the reverse clearance of the die and the punch, and the edge surface of the die is rounded and finely applied during molding. Taper processing has the effect of suppressing the occurrence of fractured surfaces and making it easier to generate shear surfaces, thereby ensuring excellent quality due to increased surface roughness on the shear surfaces.

Figure 1 is an example diagram showing a state in which a shear surface and a fracture surface occur at the edge of a product in a shear mold processing process according to the prior art.
Figures 2 and 3 are examples of the first process sequence of the shear surface processing method of a plate using press shearing and extrusion molding according to the present invention.
4 and 5 are detailed illustrations according to the present invention.
Figure 6 is an exemplary implementation of the second process according to the present invention.
Figure 7 is an exemplary implementation of the third process according to the present invention.
Figure 8 is an exemplary cross-sectional view of a product manufactured through the front-section processing method of a plate using press shearing and extrusion molding according to the present invention.

Hereinafter, specific details for implementing the present invention will be described in more detail with reference to the attached drawings.

The present invention is a method that combines the half-blanking method and extrusion molding method in a general press by applying reverse clearance of the die and punch to maintain the product quality of the front surface, and also provides rounding and fine taper processing on the blade surface of the die during molding. 1 to 8 as a method for processing the shear surface of a plate using press shearing and extrusion molding, which suppresses the occurrence of a fracture surface and favors the occurrence of a shear surface to ensure excellent quality due to increased surface roughness on the shear surface. For reference, this is done through steps S1 to S6, which are described below.

To implement the present invention, first, the plate material 10, which is a workpiece, is horizontally seated on the upper surface of the press-structured die 50 and the support pad 30 as shown in FIG. 2 (step S1).

Then, a guide plate 60 is provided on the upper part of the die 50, and a pressing punch 40 is provided on the upper part of the support pad 30. (Step S2)

In the pressing step by the pressing punch 40, the width of the pressing punch 40 is usually formed to be smaller than the plate penetration inner diameter of the die 50, so that the pressing punch 40 penetrates the die 50. The plate 10 is subjected to punching processing. However, in order to minimize the formation of a fracture surface that occurs in this normal processing structure, in step S2 of the present invention, a width larger than the plate penetration inner diameter of the die 50 is used as shown in FIG. 3. A pressing punch 40 having a was provided to press only part of the die 50 without penetrating the pressing punch 40.

At this time, the width of the pressing punch 40 is preferably formed to be larger than the plate penetration inner diameter of the die 50 by the first gap w1, which is 6 to 15% of the thickness t of the plate 10, This can be selectively adjusted depending on the material.

After step S2, a pressing punch 40 is applied to the plate 10, referring to processes 1-1 to 1-4 shown in FIGS. 2 and 3 and to FIG. 4, which is an enlarged version of the 1-4 process. is moved vertically and pressed, leaving the connecting bars 72 as long as the second interval (w2) of 6 to 15% of the thickness (t) of the plate 10 (step S3).

Looking at the pressing process in FIG. 4 in detail, the plate material 10a is positioned on the upper surface of the support pad 30 centered on the connecting spoke 72 by the pressing process using the pressing punch 40, A removal plate 10b is positioned on the upper surface of the die 50.

At this time, as a modified embodiment of step S3, as shown in FIG. 4, the bottom edge of the used plate 10a and the inner edge of the die 50 are in close contact to form a contact point p, and the contact point Centering on (p), a gap of 0.5 to 1.5% of the thickness (t) of the plate 10 occurs between the edge of the upper surface of the die 50 and the front surface of the used plate 10a located on the horizontal line. The inclination angle (θ) is formed as much as possible, and this can be selectively adjusted depending on the material.

As described above, that is, if the inner surface of the die 50 is formed to be tapered in an upwardly expanded form, the used plate 10a enters flexibly during pressing processing by the pressing punch 40, and also the inclination angle θ Since the space is created in the form of an upward expansion, the friction between the opposing used plates 10a is reduced when they enter, thereby minimizing the formation of a fracture surface.

As another modified embodiment, as shown in FIG. 5, in step S1, the inner corner of the die 50 where the contact point (p) is located is rounded (r1) to prepare the die 50, and then a pressing punch is performed. When step S3 of pressing processing at (40) is performed, a round portion is formed at the bottom edge of the used plate (10a), which has the effect of eliminating the need for separate post-processing on that portion.

At this time, the radius (r) of the rounding (r1) is preferably set to about 0.5 to 1.5% of the thickness (t) of the plate 10, and this can be selectively adjusted depending on the material.

When step S3 is completed, the used plate 10a and the removed plate 10b are separated from the plate 10 connected by the connecting bar 72 by the pressing punch 40, as shown in FIG. 6. The plate 10 is horizontally seated on the separately provided die 50 and the upper surface of the ejector 32, and then the cutting punch 42 provided on the top of the ejector 32 is vertically moved to create the connecting rod 72. Cutting is performed to separate the used plate (10a) connected to the removal plate (10b) (step S4).

At this time, the cutting punch 42 is provided to separate the used plate 10a from the plate 10, and is formed to have a width smaller than the plate penetration inner diameter of the die 50, so that the used plate 10a moves vertically. It is configured to escape.

After going through step S4, the bottom edge of the used plate 10a is rounded, but as shown in FIG. 6, the upper edge of the used plate 10a is cut by the cutting punch 42 and the cut fracture surface is formed. is formed

In order to round this, as shown in FIG. 7, the used plate material 10a is horizontally seated on the upper surface of the rounding die 54 whose corners have been rounded (r2), and then spaced apart from the upper surface of the rounding die 54. The rounding forming punch 44, which has undergone corner rounding (r3), is moved vertically to round the upper and lower corners of the used plate 10a (step S5).

At this time, the radius r of the rounding (r2, r3) is preferably formed to be about 0.5 to 1.5% of the thickness (t) of the plate 10, the same as the radius r of the rounding (r1) described above.

As shown in FIG. 8, the side portion of the used plate 10a manufactured through the steps S1 to S5 above has almost no fracture surface and the front cross section 12 is formed as a whole, so the front cross section 12 does not need to be subjected to a post-processing end mill process. Not only can the surface roughness be increased, but since the upper and lower corners of the used plate 10a are rounded, a separate finishing process does not need to be performed, thereby reducing working time and increasing productivity.

The sheet manufactured through the shear surface processing method using press shearing and extrusion molding of the present invention is mainly used for automobile battery case covers that require sealing, gears that require a shear surface, and home appliances such as TV stand bases.

According to the shear surface processing method of a sheet using press shearing and extrusion molding of the present invention described above, the product quality of the shear surface is maintained by a method that combines the half-blanking method and the extrusion molding method in a general press by applying reverse clearance of the die and punch. In addition, by rounding and finely tapering the blade surface of the die during molding, the occurrence of fractured surfaces is suppressed, and the occurrence of shear surfaces is favored, thereby ensuring excellent quality due to increased surface roughness on the shear surfaces.

The present invention described above has been described with reference to an embodiment shown in the drawings, but this is merely illustrative, and various modifications and other equivalent embodiments can be made by those skilled in the art. should be clarified. Therefore, the true technical protection scope of the present invention should be interpreted in accordance with the attached claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

10: plate 10a: plate used
10b: Removal plate 30: Support pad
32: Ejector 40: Pressing punch
42: Cutting punch 44: Rounding forming punch
50: Die 54: Rounding Die
60: Guide plate 72: Connecting beam

Claims (3)

Step (S1) of horizontally seating the plate material 10, which is a workpiece, on the upper surface of the press-structured die 50 and the support pad 30;
A guide plate 60 is provided on the upper part of the die 50 to be spaced apart, and a guide plate 60 is provided on the upper part of the support pad 30 to be 6 to 15% of the thickness t of the plate 10 than the plate penetration inner diameter of the die 50. Step (S2) of spaced apart pressing punches 40 having a width as large as the first spacing w1;
A step (S3) of vertically moving the pressing punch 40 toward the plate 10 and leaving a connecting bar 72 as long as the second interval w2 of 6 to 15% of the thickness t of the plate 10 (S3). ); A used plate (10a) is positioned on the upper surface of the support pad (30) centered on the connecting spoke (72), and a removal plate (10b) is positioned on the upper surface of the die (50),
The plate 10 is horizontally seated on the upper surface of the die 50 and the ejector 32, and then the cutting punch 42 provided on the top of the ejector 32 is vertically moved to cut the connecting rod 72. A step (S4) of separating the used plate (10a) connected to the removal plate (10b);
The used plate 10a is horizontally seated on the upper surface of the rounding die 54 that has been treated with corner rounding (r2), and then a rounding forming punch is provided spaced apart from the upper part of the rounding die 54 and processed with corner rounding (r3). A shear surface processing method of a plate using press shearing and extrusion molding, comprising a step (S5) of rounding the upper and lower corners of the used plate (10a) by vertically moving (44).
According to paragraph 1,
In step S3, with the bottom edge of the used plate 10a and the inner edge of the die 50 in close contact to form a contact point (p), the die is centered around the contact point (p). The inclination angle (θ) is formed so that a gap of 0.5 to 1.5% of the thickness (t) of the plate (10) is formed between the edge of the upper surface of (50) and the shear surface of the used plate (10a) located on the horizontal line. A method of processing the shear surface of a plate using press shearing and extrusion molding.
According to paragraph 2,
In step S1, step S3 is performed by preparing the die 50 by rounding (r1) the inner edge of the die 50 where the contact point (p) is located and then pressing it with the pressing punch 40. A shear surface processing method for a sheet material using press shearing and extrusion molding.

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