JP2018089632A - Countersunk hole forming method and press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a countersunk hole forming method which enables a countersunk hole to precisely be formed in a vicinity of the end part of a tabular workpiece and a press machine.SOLUTION: A method of forming a countersunk hole 30 where a first position P1, a vicinity of the end part Wa of a tabular workpiece W, is the center of a through hole 31, includes: a lower hole forming step of forming a lower hole 10, which is centered on a second position P2 off the end part Wa of the tabular workpiece W from a first distance d1 and has an area smaller than the area of the through hole 31; a countersunk molding step of countersunk processing, to a region including the lower hole 10, centered on the first position P1 or a third position P3 in a vicinity of the first position P1 to form a flat part 21 in a taper part 32 or a part of the region surrounded by this taper part 32; and a through hole forming step of forming a through hole 31, to a region including the flat part 21, centered on the first position P1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a dish fir hole forming method and a press machine.

  As one of the processing of plate-like workpieces using a press machine such as a punch press, countersink processing for forming countersink holes when using countersunk screws is known (for example, Patent Document 1) reference). In countersinking, first a pilot hole is formed in the workpiece by punching, and a part of the workpiece is deformed by pressing a mold for countersinking into the area containing this pilot hole. This is a technique for forming a countersunk hole in which a tapered portion is formed.

Japanese Patent No. 5947869

  In the dish fir processing described above, when a dish fir hole is formed in the vicinity of the end of the workpiece, if the mold for dish fir processing is pressed against the prepared hole, the end of the workpiece expands outward. As a result, a countersunk hole is also formed in which the prepared hole extends to the end side of the workpiece. For this reason, a taper part, a through-hole, etc. do not become a beautiful circle by plane view, but the subject that the shape of the target countersink hole cannot be obtained occurs.

  In view of the circumstances as described above, it is an object of the present invention to provide a dish fir hole forming method and a press machine capable of forming a dish fir hole with high accuracy in the vicinity of an end of a plate-shaped workpiece. To do.

  The present invention is a method of forming a countersunk hole having a first position in the vicinity of an end of a plate-like workpiece as a center of a through hole, and a second position that is farther from the end of the workpiece than the first position. A pilot hole forming step for forming a pilot hole having a center area smaller than the area of the through hole, and a region including the pilot hole for molding around the first position or the third position in the vicinity of the first position. A dish fir forming step of pressing a mold and deforming a part of the workpiece to form a flat part in a part of the taper part and the area surrounded by the taper part, and a region including the flat part, And a through hole forming step of forming a circular through hole by punching using a punch and a die around one position.

  Moreover, the pilot hole may be formed in a circular shape. In the prepared hole forming step, the prepared hole may be formed by punching using a punch and a die or laser processing. Further, the third position may be set at a position away from the end of the workpiece with respect to the first position.

  Further, the present invention is a press machine that forms a countersink hole having a first position near the end of a plate-like workpiece as a center of the through hole, and is controlled by the control unit and the control unit. The first punch and the first die or the laser head, which forms a pilot hole having a smaller area than the through-hole area, centered on the second position farther from the end of the workpiece than the position, and controlled by the controller, With respect to the region including the hole, a part of the work is deformed around the first position or the third position in the vicinity of the first position, and a flat portion is formed on the tapered portion and a portion of the region surrounded by the tapered portion. A molding die and a molding die to be formed, and a second punch and a second punch that are controlled by the control unit and that form a circular through hole larger than the pilot hole around the first position with respect to the region including the flat part. 2 dies.

  According to the countersink hole forming method according to the present invention, the center of the pilot hole is formed away from the end of the workpiece from the center of the through hole, and the area of the pilot hole is smaller than the area of the through hole. The distance from the end to the pilot hole is long, and the rigidity of this part is high. As a result, even if the molding die is pressed against the region including the pilot hole in the dish fir forming process to form the tapered portion, the end portion of the workpiece is prevented from spreading outward because the rigidity of the end portion of the workpiece is high. A flat portion can be formed in a part of the region surrounded by the tapered portion. Therefore, by forming the through hole in the region including the flat part in the through hole forming step, a countersunk hole having a taper portion and a through hole having a desired shape can be formed with high accuracy.

  In addition, when the pilot hole is formed in a circular shape, the flat part is easily formed in the dish fir forming process because the pilot hole is circular. Moreover, when a pilot hole formation process forms a pilot hole by the punching process using a punch and die, or a laser process, the pilot hole of a desired shape can be formed easily and reliably. Further, when the third position is set at a position away from the end of the workpiece with respect to the first position, the position where the molding die is pressed in the dish fir forming process is separated from the end of the workpiece. It can suppress that an edge part spreads outside.

  Moreover, according to the press machine which concerns on this invention, a countersink hole can be accurately formed in the edge part vicinity of a plate-shaped workpiece | work.

(C) is a top view which shows an example of each process of the countersink hole formation method which concerns on 1st Embodiment. The state which processes the workpiece | work W in a pilot hole formation process is shown, (A) is sectional drawing at the time of a process, (B) is sectional drawing of the workpiece | work after a process. The state which processes the workpiece | work W in a dish fir shaping | molding process is shown, (A) is sectional drawing at the time of a process, (B) is sectional drawing of the workpiece | work after a process. The state which processes the workpiece | work W in a through-hole formation process is shown, (A) is sectional drawing at the time of a process, (B) is sectional drawing of the workpiece | work after a process. It is a perspective view which shows the state in which the dish fir hole was formed in the workpiece | work. (A) And (B) is a figure which shows the countersink hole formation method which concerns on a comparative example. (C) is a top view which shows each process of the countersink hole formation method which concerns on 2nd Embodiment. It is sectional drawing which shows the workpiece | work W after a through-hole formation process. It is a figure showing typically an example of a press machine concerning an embodiment. It is a figure which shows the other example of a press machine typically.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to this. Further, in the drawings, in order to describe the embodiment, the scale is appropriately changed and expressed by partially enlarging or emphasizing the description.

<First Embodiment>
Drawing 1 is a top view showing an example of each process of a countersink hole formation method concerning a 1st embodiment. The countersunk hole forming method of the present embodiment is a method of forming countersunk hole 30 for using a countersunk screw on plate-like workpiece W. As shown in FIGS. It includes a hole forming step ST01, a dish fir forming step ST02, and a through hole forming step ST03.

  Moreover, FIG. 2 is a figure which shows the state which processes the workpiece | work W in a pilot hole formation process. FIG. 3 is a diagram illustrating a state in which the workpiece W is processed in the dish fir forming process. FIG. 4 is a diagram illustrating a state in which the workpiece W is processed in the through hole forming step. As shown in FIG. 1 (C), the dish fir hole forming method of the present embodiment includes a dish fir hole 30 with the first position P1 in the vicinity of the end Wa of the plate-like workpiece W as the center of the through hole 31. Form. The first position P1 is set to a first distance d1 from the end portion Wa of the workpiece W (see FIG. 1B). For example, the first distance d1 is set to 5.3 mm from the end portion Wa, but is not limited thereto.

  First, the pilot hole forming step ST01 will be described. In the pilot hole forming step ST01, as shown in FIG. 1A, the pilot hole 10 is formed around the second position P2 of the workpiece W. The second position P2 is set at a position farther from the end Wa of the workpiece W than the first position P1. That is, the second distance d2 from the end Wa of the workpiece W to the second position P2 is set longer than the first distance d1 from the end Wa to the first position P1. For example, the second distance d2 is set to 5.9 mm from the end portion Wa, but is not limited thereto. The second distance d2 is longer than the distance from the end portion Wa to the third position P3.

  The pilot hole 10 is a circular hole having an area smaller than the area of the through hole 31 and is formed through the workpiece W in the thickness direction. The second diameter R2 of the pilot hole 10 is set to 4.5 mm, for example, but is not limited to this. Moreover, the pilot hole 10 is not limited to circular shape. For example, the pilot hole 10 may be formed in an elliptical shape, an oval shape, or a polygonal shape such as a quadrangle. The area of the pilot hole 10 can be arbitrarily set as long as it is smaller than the area of the through hole 31. However, in the next dish fir forming step ST02, the area of the pilot hole 10 is set in a range in which a flat portion 21 described later is appropriately formed.

  As shown in FIG. 2A, in the pilot hole forming step ST01, the pilot hole 10 centered on the second position P2 is formed by punching using the first punch 2 and the first die 3. Thereby, the pilot hole 10 of a desired shape can be formed easily and reliably. In the pilot hole forming step ST01, first, the workpiece W is arranged on the first die 3 arranged in advance, and the punch tool 1 is lowered in this state. The punch tool 1 includes a first punch 2 and a stripper 4, and the first punch 2 is disposed in a state where the first punch 2 is positioned on the first die 3. In the pilot hole forming step ST01, a turret punch press provided with the punch tool 1 and the first die 3 is used.

When the punch tool 1 is lowered, the stripper 4 abuts against the workpiece W to hold the workpiece W, and when the punch tool 1 is further lowered, a part of the workpiece W is punched by the first punch 2 and the first die 3. FIG. 2B is a diagram showing a shape along the section AA in FIG. As shown in FIG. 2B, a pilot hole 10 having a second diameter R2 is formed around a position at a second distance d2 from the end Wa of the workpiece W. The pilot hole 10 in the pilot hole forming step ST01 is not limited to being formed by punching using the first punch 2 and the first die 3. For example, the pilot hole 10 may be formed by cutting such as a drill, or may be formed by laser processing. When laser processing is used to form the pilot hole 10, for example, a CO ₂ laser compound machine or a fiber laser compound machine may be used.

  Next, the dish fir forming step ST02 will be described. In the dish fir forming step ST02, as shown in FIG. 1B, a dish fir processing is performed on the workpiece W around the third position P3 in the vicinity of the first position P1 with respect to the region including the pilot hole 10. The tapered portion 32 and the flat portion 21 are formed. The third position P3 is set to a position separated from the end position Wa by the third distance d3 with respect to the first position P1. The third distance d3 is set to 0.2 mm, for example. Thereby, although the 3rd position P3 is set to 5.5 mm from end part Wa, for example, it is not limited to this.

  The tapered portion 32 has an outer peripheral portion 32a and an inner peripheral portion 32b. The third diameter R3 of the outer peripheral portion 32a is set to, for example, 8.2 mm, and the fourth diameter R4 of the inner peripheral portion 32b is set to, for example, 5.1 mm, but is not limited thereto. In addition, the 3rd diameter R3 of the outer peripheral part 32a may be called a countersink hole diameter or a countersink hole diameter, for example. Further, the flat portion 21 is formed in a part of a region surrounded by the inner peripheral portion 32 b of the tapered portion 32.

  As shown in FIG. 3A, in the dish fir forming step ST02, first, the work W on which the prepared hole 10 is formed is placed on the forming die 5. In the dish fir forming step ST02, a press machine or the like in which a molding die 6 for dish fir molding is disposed above the molding die 5 is used. The workpiece W is held on the molding die 5 by a clamping device (not shown). In a state where the workpiece W is placed on the molding die 5, the molding die 6 is lowered, and the molding die 6 is pressed against an area including the prepared hole 10 to deform a part of the workpiece W.

  FIG. 3B shows a shape along the BB cross section in FIG. As shown in FIG. 3B, a part of the workpiece W is deformed by the molding die 6 to form a circular tapered portion 32 centered on the third position P3, and is further surrounded by the tapered portion 32. A flat portion 21 is formed in the part. In the dish fir forming step ST02, the flat portion 21 is formed so as to block a part of the prepared hole 10. In this case, since the pilot hole 10 is circular, the flat portion 21 can be easily formed in the dish fir forming step ST02.

  In this dish fir forming step ST02, since the distance from the end Wa of the workpiece W to the pilot hole 10 is long, the rigidity of this portion is increased, and even when the molding die 6 is pressed against the workpiece W, the end Wa is It is possible to suppress swelling to the outside easily. In addition, the portion deformed by being pressed against the molding die 6 extends so as to close the prepared hole 10, so that the end portion Wa of the workpiece W is suppressed from being pushed outward.

  In the dish fir forming step ST02, the taper portion 32 and the flat portion 21 can be easily and accurately formed by using the molding die 6. However, the dish fir forming step ST02 is not limited to using one molding die 6 as illustrated. For example, in the dish fir forming step ST02, the tapered portion 32 and the flat portion 21 may be formed using a rotating mold, or the tapered portion 32 and the flat portion 21 may be formed using a plurality of molds. Good. Moreover, cutting may be included in a part of the dish fir forming step ST02.

  Next, the through hole forming step ST03 will be described. The through hole forming step ST03 may be referred to as a finishing step, for example. In the through hole forming step ST03, as shown in FIG. 1C, the through hole 31 is formed around the first position P1 in the region including the flat portion 21. The first diameter R1 of the through hole 31 can be set to 5.2 mm, for example, but is not limited thereto. The first diameter R1 of the through hole 31 is set by the outer diameter of the screw portion of the countersunk screw to be used. The first diameter R1 of the through hole 31 may be referred to as a through hole diameter, for example. Further, the fourth diameter R4 of the inner peripheral portion 32b of the tapered portion 32 formed in the dish fir forming step ST02 is set to be smaller than the first diameter R1 of the through hole 31. However, the fourth diameter R4 of the inner peripheral portion 32b may be the same as the first diameter R1 of the through hole 31.

  As shown in FIG. 4A, in the through hole forming step ST03, a through hole 31 centered on the first position P1 is formed by punching using the second punch 7 and the second die 8. Thereby, the through hole 31 having a desired shape can be easily and reliably formed. In the through hole forming step ST03, first, the workpiece W is arranged on the second die 8 arranged in advance, and the punch tool 1A is lowered in this state. The punch tool 1 </ b> A includes a second punch 7 and a stripper 4 </ b> A, and the second punch 7 is disposed in a state of being positioned on the second die 8. In the through hole forming step ST03, a turret punch press equipped with the punch tool 1 and the second die 8 is used as in the prepared hole forming step ST01.

  When the punch tool 1A is lowered, the stripper 4A comes into contact with the workpiece W to hold the workpiece W, and further, the punch tool 1A is lowered to punch out the region including the flat portion 21 of the workpiece W by the second punch 7. . FIG. 4B is a diagram illustrating a shape along a CC cross section in FIG. As shown in FIG. 4B, a through hole 31 having a first diameter R1 is formed around the first position P1. As shown in FIG. 1C, the first position P1 that is the center of the through-hole 31 is shifted by the third distance d3 toward the end Wa with respect to the third position P3 that is the center of the dish fir molding. It is in the state. The through hole 31 in the through hole forming step ST03 is not limited to being formed by punching using the second punch 7 and the second die 8. For example, the through hole 31 may be formed by cutting such as a drill.

  The pilot hole forming step ST01, the dish fir forming step ST02, and the through hole forming step ST03 described above may be performed by the same press machine or different press machines. When performing with the same press machine, the 1st punch 2 corresponding to each process, the 1st die 3, etc. are suitably attached or selected to a press machine, and each process is carried out. The attachment or selection of the first punch 2 and the first die 3 may be performed automatically by an instruction from the control unit or the like, or may be performed manually by an operator.

  FIG. 5 is a perspective view showing a state in which the countersunk hole 30 is formed in the work W by the above-described steps. As shown in FIG. 5, a countersunk hole 30 is formed in the vicinity of the end Wa of the workpiece W. The countersunk hole 30 is formed in a circular shape targeted by the through hole 31, and a tapered portion 32 is formed surrounding the through hole. The outer peripheral portion 32a of the tapered portion 32 is also formed in a circular shape. Thus, the countersunk screw can be used satisfactorily because the through hole 31 and the tapered portion 32 are circular.

  Further, the end Wa of the workpiece W may be slightly expanded outward by the dish fir forming step ST02. In this case, the end Wa is formed before the through hole forming step ST03 or after the through hole forming step ST03. By cutting the swelled portion, it is possible to make the end portion Wa into the original linear shape.

  6A and 6B are diagrams illustrating an example of a countersunk hole forming method according to a comparative example. FIG. 6A shows a process of forming the prepared hole 41 in the workpiece W. FIG. 6B shows a step of performing dish fir processing on the workpiece W. As shown in FIG. 6 (A), in the countersunk hole forming method according to the comparative example, for example, with a punching process using a punch and a die, centering on the position where the through hole 51 is formed in the workpiece W, the fifth A pilot hole 41 having a diameter R5 is formed. The fifth diameter R5 of the prepared hole 41 is larger than the first diameter R1 of the through hole 51, and is set to 6.1 mm, for example.

  Next, a molding die for dish fir processing is pressed against a region including the pilot hole 41 against the workpiece W in which the pilot hole 41 is formed, and a part of the workpiece W is deformed. This molding die is the same as the molding die 6 shown in FIG. Thereby, although the edge part of the pilot hole 41 deform | transforms, since the distance from the edge part Wa to the pilot hole 41 is short, the rigidity of this part is low. As a result, as shown in FIG. 6B, as the molding die is pressed, the end portion Wa of the workpiece W expands outward, and the pilot hole 41 also expands toward the end portion Wa side of the workpiece W. A countersunk hole 50 is formed. For this reason, the through hole 51 does not have a clean circular shape in plan view, and further, the desired inclination is not formed on the end side of the tapered portion 52, and the target dish fir hole shape cannot be obtained. Become.

  On the other hand, in the countersunk hole forming method according to the first embodiment, as shown in FIG. 1C or FIG. 5, the pilot hole 10 is formed in a circular shape with the first position P1 as the center. Furthermore, a countersunk hole 30 is formed in which a desired taper portion 32 is formed surrounding the through hole 31. Therefore, unlike the comparative example shown in FIG. 6, the end portion side of the pilot hole 10 does not expand, and the tapered portion 32 forms an appropriate inclination over the entire circumference of the pilot hole 10.

  As described above, according to the present embodiment, by performing the above-described pilot hole forming step ST01, dish fir forming step ST02, and through hole forming step ST03, the end portion Wa of the workpiece W is prevented from spreading outward. Therefore, the countersunk hole 30 having the tapered portion 32 and the through hole 31 having a desired shape can be formed with high accuracy.

Second Embodiment
Next, a second embodiment will be described. In this embodiment, the position where the through hole 31 is formed is different from that of the first embodiment, and the other points are the same as those of the first embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified. Moreover, what can be applied to the content described in the first embodiment in the second embodiment can also be applied to the second embodiment.

  7A to 7C are plan views showing respective steps of the countersink hole forming method according to the second embodiment. FIG. 8 is a diagram showing a shape along the DD cross section in FIG. 7C, and is a diagram showing a cross-sectional configuration of the work W after the through hole forming step.

  The dish fir hole forming method according to the second embodiment includes a prepared hole forming process ST01, a dish fir forming process ST02, and a through hole forming process ST03, as in the first embodiment. As shown in FIG. 7C, the counter fir hole forming method of the present embodiment has a counter fir hole 30 </ b> A having the first position P <b> 1 at the first distance d <b> 1 from the end Wa of the workpiece W as the center of the through hole 31 </ b> A. Form.

  In the pilot hole forming step ST01, as shown in FIG. 7A, the pilot hole 10 is formed around the second position P2 of the workpiece W. Similar to the first embodiment, the second position P2 is set at a position away from the end Wa of the workpiece W, and the second distance d2 is larger than the first distance d1. The pilot hole 10 is a circular hole having an area smaller than the area of the through hole 31A, and penetrates the workpiece W in the thickness direction. The second diameter R2 of the pilot hole 10 is set to 4.5 mm, for example, as in the first embodiment, but is not limited thereto. In the pilot hole forming step ST01, the pilot hole 10 is formed by punching using, for example, the first punch 2 and the first die 3 as in the first embodiment (see FIG. 3A).

  Next, in the dish fir forming step ST02, as shown in FIG. 7 (B), the region including the pilot hole 10 is dished with the first position P1 as the center, and the workpiece W is flattened with the tapered portion 32. Part 21 is formed. Similar to the first embodiment, the tapered portion 32 has a third diameter R3 of the outer peripheral portion 32a of, for example, 8.2 mm, and a fourth diameter R4 of the inner peripheral portion 32b of, for example, 5.1 mm. The flat portion 21 is formed in a part of the region surrounded by the tapered portion 32. In the dish fir forming step ST02, the work W on which the prepared hole 10 is formed is placed on the forming die 5, and the forming mold 6 for forming the dish fir is pressed against an area including the prepared hole 10 to form one piece of the work W. The part is deformed (see FIG. 4A).

  Next, in the through hole forming step ST03, as shown in FIG. 7C, a through hole 31A is formed around the first position P1 in the region including the flat portion 21. The first diameter R1 of the through hole 31A is set to, for example, 5.2 mm, but is not limited thereto. The first diameter R1 of the through hole 31 is set to be larger than the fourth diameter R4 of the inner peripheral portion 32b of the tapered portion 32 formed in the dish fir forming step ST02, but is the same as the fourth diameter R4. There may be. In the through hole forming step ST03, the through hole 31A is formed by punching using the second punch 7 and the second die 8 as in the first embodiment (see FIG. 5A). As a result, as shown in FIG. 9, a through hole 31 </ b> A having a first diameter R <b> 1 centered on the first position P <b> 1 at the first distance d <b> 1 from the end Wa of the workpiece W is formed.

  As described above, in the second embodiment, similarly to the first embodiment, the end portion Wa of the workpiece W is set to the outside by performing the pilot hole forming step ST01, the dish fir forming step ST02, and the through hole forming step ST03. Since the expansion is suppressed, the countersunk hole 30A having the tapered portion 32 and the through hole 31A having a desired shape can be formed with high accuracy. In the present embodiment, the dish fir forming step ST02 is performed around the first position P1 that is the center of the through hole 31A, and the numerical position management is not performed without using the third position P3 as in the first embodiment. It can be simplified.

<Press machine>
FIG. 9 is a diagram schematically illustrating an example of a press machine according to the present embodiment. As shown in FIG. 9, the press machine 100 is a turret punch press, and includes an upper turret 101 and a lower turret 102. In the upper turret 101, the first punch 2, the molding die 6, and the second punch 7 described above are arranged. In the lower turret 102, the first die 3, the molding die 5, and the second die 8 are arranged. The press machine 100 performs a punching process or a forming process by sandwiching the workpiece W between the first punch 2 and the first die 3 and the like.

  The upper turret 101 is held on the upper frame 103 via the rotation shaft 104. The lower turret 102 is held on the lower frame 105 via the rotation shaft 106. Each of the upper turret 101 and the lower turret 102 is formed in a disk shape and is disposed in a state of facing each other, and can be rotated around the rotation shafts 104 and 106 by a driving device (not shown) such as an electric motor. Each of the upper turret 101 and the lower turret 102 rotates, and a pair (for example, the first punch 2 and the first die 3) that becomes a pair is selected as the punch position P. The first punch 2 at the punch position P is lowered by the upper drive unit 107.

  A guide 108 is formed along the X direction on the upper surface of the lower frame 105, and a movable table 109 that can be moved by a driving device (not shown) is disposed along the guide 108. The movable table 109 is provided with a Y-direction guide 110, and a cross slide 111 that can be moved along the Y-direction guide 110 by a driving device (not shown) is installed. The cross slide 111 includes two or more work holders 112 spaced in the Y direction. The workpiece W is held by the workpiece holder 112 and is conveyed by movement in the X direction by the movable table 109 and movement in the Y direction by the cross slide 111, and the processing target position is positioned at the punch position P.

  Driving of each part of the press machine 100, for example, rotation of the upper turret 2 and lower turret 4, driving of the upper driving unit 107, and movement of the cross slide 15 and the movable table 13 are controlled by the control unit 113. The control unit 113 causes the pilot hole forming step ST01, the dish fir forming step ST02, and the through hole forming step ST03 shown in FIG. 1 or 7 to be executed. In the prepared hole forming step ST01, the upper turret 2 and the lower turret 4 are rotated to select the first punch 2 and the first die 3 at the punch position P, and the cross slide 15 and the movable table 13 are moved to move the first turret 2 After the second position P2 (see FIG. 1) is positioned at the punch position P, the pilot hole 10 is formed as shown in FIG.

  Subsequently, in the dish fir forming step ST02, the upper turret 2 and the lower turret 4 are rotated to select the molding die 6 and the molding die 5 as the punch position P, and the third position P3 of the workpiece W (see FIG. 1). ) Or after positioning the first position P1 (see FIG. 7) at the punch position P, the taper portion 32 and the flat portion 21 are formed as shown in FIG. Subsequently, in the through hole forming step ST03, the upper turret 2 and the lower turret 4 are rotated to select the second punch 7 and the second die 8 as the punch position P, and the first position P1 of the workpiece W (see FIG. 1). After positioning at the punch position P, the through hole 31 is formed as shown in FIG.

  In addition, although the press machine 100 has shown the turret punch press, it may be other than a turret punch press. Moreover, it is not limited to performing the pilot hole formation process ST01, the dish fir forming process ST02, and the through-hole formation process ST03 with one press machine 100, For example, a different press machine may be used for every process. Further, part or all of the driving of the press machine 100 described above may be performed manually by an operator without being controlled by the control unit 113.

FIG. 10 is a diagram schematically illustrating another example of the press machine. As shown in FIG. 10, the press machine 200 is, for example, a CO ₂ laser composite machine or a fiber laser composite machine, and includes a laser processing unit 201 and a press processing unit 202. The laser processing unit 201 includes a laser head 203 that emits a laser beam capable of forming the pilot hole 10 and the like in the workpiece W. The laser head 203 is formed to be movable in the X direction, the Y direction, and the Z direction by a driving device (not shown). Further, a guide 204 is formed over the laser processing unit 201 and the press processing unit 202, and a slider 206 that can be moved by a driving device (not shown) is provided along the guide 204.

  The slider 206 is provided with a plurality of clamping devices 205, and the workpiece W is held by the clamping device 205 and can move in the X direction as the slider 206 moves. The press processing unit 202 includes, for example, the above-described upper turret 101 and lower turret 102, and a pair of pairs (for example, the first punch 2 and the first die 3) can be selected as the punch position P. .

  Driving of each part of the press machine 200, for example, driving of the laser head 203, movement of the slider 206, selection and driving of the first punch 2 and the first die 3, and the like are controlled by the control unit 207. The control unit 113 causes the pilot hole forming step ST01, the dish fir forming step ST02, and the through hole forming step ST03 shown in FIG. 1 or 7 to be executed. In the pilot hole forming step ST01, after moving the laser head 203 to the second position P2 (see FIG. 1) of the workpiece W, the laser beam is emitted and the pilot hole 10 is formed.

  Subsequently, in the dish fir forming step ST02, the slider 206 is moved to move the workpiece W from the laser processing unit 201 to the press processing unit 202, and the processing target position is positioned at the punch position P. The workpiece W is positioned in the X direction by the slider 206. The workpiece W is positioned in the Y direction by moving the workpiece W in the Y direction or by moving the punch position P in the Y direction. After the third position P3 (see FIG. 1) or the first position P1 (see FIG. 7) of the workpiece W is positioned at the punch position P, the tapered portion 32 and the flat portion 21 are formed as shown in FIG. Subsequently, in the through hole forming step ST03, the second punch 7 and the second die 8 are selected as the punch position P in the press working unit 202, and the first position P1 (see FIG. 1) of the workpiece W is positioned at the punch position P. After that, the through hole 31 is formed as shown in FIG.

  In the press machine 200, the through hole forming step ST03 is performed by the pressing unit 202. However, the laser processing unit 201 may be used, or the prepared hole forming step ST01 may be performed by the pressing unit 202. Further, part or all of the driving in the press working unit 202 may be performed manually by an operator without being controlled by the control unit 207.

  Thus, according to the press machines 100 and 200 of the present embodiment, the pilot hole forming step ST01, the dish fir forming step ST02, and the through hole forming step ST03 can be performed easily and reliably. Thereby, the countersunk holes 30 and 30A can be accurately formed near the end of the plate-like workpiece W.

  The embodiment has been described above, but the present invention is not limited to the above description, and various modifications can be made without departing from the gist of the present invention. The requirements described in the above embodiments can be combined as appropriate.

P1 ... 1st position P2 ... 2nd position P3 ... 3rd position W ... Work Wa ... End 2 ... 1st punch 3 ... 1st die 5 ... Molding die 6 ... Molding die 7 ... Second punch 8 ... Second die 10, 41 ... Pilot hole 21 ... Flat part 30, 50, 30A ... Countersink hole 31, 51, 31A ... through holes 32, 52 ... tapered portion 32a ... outer peripheral portion 32b ... inner peripheral portion 100, 200 ... press machine 101 ... upper turret 102 ... lower Turret 201 ... Laser processing unit 202 ... Press processing unit 203 ... Laser head

Claims (5)

A method of forming a countersunk hole with the first position in the vicinity of the end of the plate-like workpiece as the center of the through hole,
A pilot hole forming step of forming a pilot hole having an area smaller than an area of the through hole, with the second position away from the end of the workpiece from the first position as a center;
A taper portion and the taper portion are formed by pressing a molding die around the first position or a third position in the vicinity of the first position with respect to the region including the pilot hole to deform a part of the workpiece. A dish fir forming step for forming a flat portion in a part of the region surrounded by
A countersunk hole forming method comprising: a through hole forming step of forming a circular through hole in a region including the flat part by punching using a punch and a die around the first position.   The countersunk hole forming method according to claim 1, wherein the pilot hole is formed in a circular shape.   The counter fist hole forming method according to claim 1 or 2, wherein the prepared hole forming step forms the prepared hole by punching using a punch and a die, or laser processing.   4. The countersunk hole forming method according to claim 1, wherein the third position is set at a position away from an end portion of the workpiece with respect to the first position. 5. A press machine that forms a countersunk hole with a first position near the end of a plate-shaped workpiece as the center of the through hole,
A control unit;
A first punch and a first die that are controlled by the control unit and that form a pilot hole centered on a second position that is farther from the end of the workpiece than the first position and having an area smaller than the area of the through hole; Or with a laser head,
A taper portion and this taper portion that are controlled by the control unit and deform a part of the work around the first position or a third position near the first position with respect to the region including the pilot hole. A molding die and a molding die for forming a flat portion in a part of the region surrounded by
A second punch and a second die that are controlled by the control unit and that form a circular through hole larger than the pilot hole around the first position with respect to the region including the flat part, Press machine.

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