JP2006198659A - Method and apparatus for punching plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punching method and a punching apparatus of a plate by which a punched refuse is fallen without being raised in the case the plate to be punched is covered with a protective sheet. <P>SOLUTION: The method for punching the plate W covered with the protective sheet WS comprises a step where a chill CA is blown onto the punching part of the plate, a step where the protective sheet WS in the punching part is cooled and hardened and the plate W is punched with punching dies 5, 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for punching a plate material and an apparatus therefor, and more specifically, for example, when punching a plate material covered with a protective sheet by a punch press, for example, punching the plate after the protective sheet is cooled and cooled by cold air The present invention relates to a method and an apparatus thereof.

Conventionally, when punching a plate material by, for example, a punch press, it is normal that scrap (cass) punched and dropped from the plate material passes through the die hole of the die and falls out of the die from the die hole. In some rare cases, the residue rises as the punch rises, passes through the die hole, and moves to the space between the upper surface of the die and the lower surface of the punch. In view of this, a technique has been developed in which a negative pressure is generated in the lower portion of the die, in particular, the residue through hole, and the punched residue is forcibly discharged from the residue hole and dropped (for example, Patent Document 1 and 2).
Patent Publication No. 2004-17113 Patent Publication No. 2004-1055

  However, when punching a plate covered with a protective sheet (vinyl or the like), as shown in FIG. 11, even if the protective sheet WS extends downward and the sheet metal WP is punched away from the plate W, The protection sheet WS is in a state where it cannot be separated from the plate material W. Even if the technique disclosed in the above document is used, the residue rises as the punch 169 rises, passes through the die hole and moves to the space between the upper surface of the die 109 and the lower surface of the punch 169, resulting in deficiencies. It is.

  The above phenomenon occurs more frequently when punching by overtaking or the like. First, the state in which the residue rises in the overtaking process will be described. 12 and 13 show a state in which the protective sheet WS is extended after the plate material W is punched out. A punching hole 123 of the protective sheet WS extends in the center of the hole in the amount of dimension E with respect to the punching hole 121 of the sheet metal WP. From this state, a position indicated by a solid line in FIG. At this time, the two stretched beard-shaped protective sheets 161S are not easily cut at the portion 163 surrounded by a broken-line circle, and as shown in FIG. 15, the punched sheet metal 151P and the protective sheet 151S are formed by the whiskers. The two sheets of protective sheet 161S are in a suspended state.

  On the other hand, the same phenomenon occurs in the case of punching shown in FIG. This is a process called crushing, and first, a portion 171 is punched as shown in FIG. Next, the part 172 is punched as shown in FIG. 2B, the part 173 is punched out as shown in FIG. 3C, and finally the part 174 is punched out as shown in FIG. In this case, similarly to the above-described overtaking, the two beard-shaped protective sheets 187S extending as shown in FIG. 17 are difficult to be cut at the portion 191 surrounded by the broken-line circle, and as shown in FIG. The extracted sheet metal 174P and protective sheet 174S are suspended by the two protective sheets 187S having a beard shape.

 Also in the punching process by the overtaking process and the crushing process, after the sheet metal WP is punched from the plate material W and separated, the protective sheet WS cannot be separated from the plate material W. As the punch 169 rises, the residue rises, passes through the die hole, moves to the space between the upper surface of the die 109 and the lower surface of the punch 169, resulting in a defect.

  The present invention has been made in view of the above-described problems, and the purpose thereof is to drop a punching scrap without raising it even when the punching plate is covered with a protective sheet (vinyl or the like). An object of the present invention is to provide a method and apparatus for punching a plate material.

  The invention according to claim 1 is a method of punching a plate material covered with a protective sheet, the step of blowing cool air to the punched portion of the plate material, the step of cooling and hardening the protective sheet of the punched portion, And a step of punching the plate material with a mold.

  According to a second aspect of the present invention, in the method for punching a plate material according to the first aspect, the cold air is blown from the periphery of the die of the punching die to the lower surface of the plate material.

  According to a third aspect of the present invention, in the method for punching a plate material according to the second aspect, the step of discharging the punched scrap from the punched hole of the die by generating a negative pressure in the lower portion of the die, Furthermore, it is the board | plate material punching method characterized by the above-mentioned.

  The invention according to claim 4 is the plate material punching method according to claim 1, wherein the cold air is blown from the punch of the punching die onto the upper surface of the plate material.

  According to a fifth aspect of the present invention, in the method for punching a plate material according to the fourth aspect of the invention, the cold air is applied to the upper surface of the plate material from a gap between a punch holder hole formed in the punch holder of the punch and a punch body of the punch. A plate material punching method characterized by spraying.

  The invention according to claim 6 is an apparatus for punching a plate material covered with a protective sheet, and is provided around a die, a punch for punching the plate material covered with the protective sheet, and on the lower surface of the plate material. A plate punching device comprising: a nozzle for blowing cool air; a communication pipe for communicating cold air with the nozzle; and a cold air supply means for supplying cold air to the communication pipe.

  The invention according to claim 7 is the plate material punching apparatus according to claim 6, wherein a plurality of the nozzles are provided in a ring-shaped nozzle cap.

 According to the present invention described in claims 1 to 7, even if the punched plate material is covered with a protective sheet (vinyl or the like), the protective sheet is cooled and cooled by cold air, and cured. Since the punching process is performed after the elongation is reduced, the punching waste can be dropped without being raised. Therefore, it can be avoided that the punched debris passes through the die hole and rises / moves into the space between the upper surface of the die and the lower surface of the punch to cause defects.

  Hereinafter, with reference to FIG. 1 thru | or FIG. 9, the board | plate material punching method and its apparatus which concern on embodiment of this invention are demonstrated.

  The apparatus shown in FIG. 1 is a plate material punching apparatus according to a first embodiment based on the present invention. The present invention can be applied to a one-station punch press, a turret punch press, and other punch presses. Hereinafter, the turret punch press will be described as an example. First, the upper turret 1 is provided with a plurality of punches 5 which are upper molds of a punching die. On the other hand, a plurality of dies 9 for punching the plate material W in cooperation with the punch 5 are mounted on the lower turret 3 via a die holder 7. Around the die 9, a nozzle cap 11 is embedded in an annular recess 8 formed in the die holder 7 as shown in FIGS. As shown in FIGS. 2, 3 and 4, the nozzle cap 11 includes a plurality of chambers 17 for introducing cool air to be supplied, which is connected to a communication pipe 21 formed in the lower turret 3. An annular connecting pipe (communication pipe) 19 for connecting the chamber 17 and a nozzle 15 for injecting the cold air from the plurality of chambers 17 and blowing it to the lower surface of the plate material W are formed. The nozzles 15 are each formed in an inclined state toward the center of the die 9.

  In the above configuration, the cold air CA is blown from the plurality of nozzles 15 to the lower surface of the plate member W via the communication pipe 21 and the nozzle cap 11 from the cold air supply means 53. Since the protective sheet WS made of vinyl is stuck on the lower surface side of the plate material W, the cold air CA cools and hardens the protective sheet WS. In a state where the protective sheet WS is cured by the cold air CA, the punch 5 and the die 9 cooperate to punch out the plate material W. At this time, since the protective sheet WS is further cured and the elongation is reduced, both the sheet metal WP and the protective sheet WS of the plate material W are sheared. Therefore, even if the punch 5 finishes punching and descends to the bottom dead center and rises again, the punching waste of the plate material W does not rise with the punch 5 through the die hole 75 of the die 9. Thereby, the punched waste can fall below the lower turret 3 via the waste discharge hole 79 of the die 9.

  The die 9 is also provided with a configuration for more reliably dropping the punched residue, and will be described below with reference to FIG. A communication hole 29 is formed in the die 9, and a liner 23 is fitted in the residue hole 77 of the die 9, and an annular communication pipe 27 communicating with the communication hole 29 is connected to the liner 23. Is formed. Further, the liner 23 is formed with a plurality of jet nozzles 25 inclined downward from the communication pipe 27 to communicate with the residue hole 77.

  In the above-described configuration, the compressed air supplied from the compressed air supply means (not shown) is ejected from the ejection nozzle 25 via the communication hole 29 and the communication pipe 27, whereby a negative pressure is applied to the residue hole 77. Is generated. Since the punched waste is sucked downward by this negative pressure, the punched waste can be more reliably dropped.

  Next, a conduit for transporting the cold air CA from the die holder 7 and the cold air supply means 53 to the die holder 7 will be described with reference to FIGS. The die holder 7 includes an upper die holder 31 and a lower die holder 31. The die holder 7 is formed with a plurality of die storage portions 47 for inserting and fitting the die 9 therein. Pipe lines 35, 39, 41, 45 through which the cold air CA from the cold air supply means 53 passes are formed in the die holder 7, and the pipe line 45 communicates with the communication pipe 21 shown in FIG. With this configuration, the cold air CA from the cold air supply means 53 is supplied to the nozzle cap 11.

  Further, the other communication pipe 21 formed in the other die housing portion 47 is communicated with a communication pipe 37 that is bent as shown by a broken line in FIGS. 5 and 6. Therefore, the cold air CA from the cold air supply means 53 is supplied to all the nozzle caps 11 through all the communication pipes 21 formed in the vicinity of the periphery of all the die storage portions 47.

  The die holder 7 supplies the compressed air supplied from the compressed air supply means to all the communication pipes 51 formed in the vicinity of the periphery of all the die storage portions 47 in addition to the conduit for conveying the cold air CA. A communication pipe 52 is formed. The lower turret 3 (see FIG. 1) is formed with a conduit 50 through which the compressed air from the compressed air supply means passes and communicates with a communication tube 54 formed in the die holder 7. Since the compressed air is supplied to all the communication pipes 51 formed in the vicinity of all the die storage portions 47 via the bent communication pipes 52 as shown in FIG. The compressed air is supplied to the ejection nozzle 25 of the die 9.

  Next, with reference to FIG. 9, the board | plate material punching apparatus which concerns on 2nd Embodiment based on this invention is demonstrated. This embodiment is mainly suitable for a large-diameter mold. A die holder 83 is attached to the lower turret 3, and a die 85 is fitted to the die holder 83. On the upper surface of the die 85, a plate material W to be punched is positioned. The plate material W is also the same as the plate material W described in the first embodiment, and the lower surface of the sheet metal WP is covered with the protective sheet WS. Above this, the upper turret 1 and the loaded punch 81 are located.

  A nozzle 87 is provided around the die holder 83, and cold air CA supplied from the cold air supply means 53 provided at an appropriate position near the lower turret 3 is blown onto the protective sheet WS.

  Furthermore, as another embodiment, the protective sheet WS may be cooled by another nozzle 93 provided directly on the lower turret 3 in addition to the nozzle 87.

  The above-described aspect is applied when punching is performed in a state where the lower surface of the sheet metal WP is covered with the protective sheet WS. Hereinafter, as the third embodiment, the upper surface of the sheet metal WP is A plate material punching device applied when the plate material W is punched while being covered with the protective sheet WS will be described with reference to FIG. 1 again.

  In the punch body 69 of the punch 5, a communication pipe 61 is formed vertically along its axis, and in the vicinity of the tip of the punch body 69, the punch body 69 extends in the lateral direction communicating with the vertical communication pipe 61. The communication pipe 63 is formed. Further, a communication pipe 65 extending in the vertical direction is formed at the outer end of the communication pipe 63. Since the communication pipe 59 is also formed in the striker 55, the cold air CA supplied from the cold air supply means 53 is the pipe 57, the communication pipe 59, the communication pipe 61, the horizontal communication pipe 63, and the vertical pipe. And then flows into a donut-shaped space 71 formed between the punch holder 67 of the punch 5 and the tip of the punch body 69.

  Further, the cold air CA flowing into the space 71 passes through an annular gap 73 formed between the punch holder hole 68 formed in the punch holder and the tip end portion of the punch body 69, and the plate material W. It is sprayed on the upper surface of the protective sheet WS covering the upper surface. As a result, the portion of the protective sheet WS that is punched out is cooled and cured. Along with the curing, since the elongation is reduced, the punching process is completely performed and the protective sheet WS is also sheared, so that it is possible to avoid an increase in the punched residue.

  Next, the operation in the above configuration will be described. First, the plate material W is positioned at a desired appropriate position of the die 9 by a positioning device provided in the turret punch press. When the plate material W stops, the cold air supply means 53 generates cold air CA, and the cold air CA passes through the communication pipe formed in the lower turret, and the pipelines 35, 39, 41, 45 and 37 (FIG. 5). , See FIG. 6) and reach the communication pipe 21 (see FIG. 1) formed in the vicinity of the periphery of each die storage portion 47. It flows into the chamber 17 and the communication pipe 19 formed in the nozzle cap 11 and is ejected from the nozzle 15. In a state where the protective sheet WS covering the lower surface of the plate material W is cooled and hardened, the striker 55 is lowered and punched. At this time, since the protective sheet WS is cooled and hardened and the elongation is reduced, the shearing process is performed in a complete state, so that the punched residue is completely separated from the plate material W.

  In order to more surely drop the punched debris below the die 9, the compressed air supplied from the compressed air supply means passes through a pipe line 50 formed in the lower turret 3 (see FIG. 1). , Communicated with a communication pipe 54 (see FIG. 7) formed in the die holder 7. Then, the air flows into all the communication pipes 51 formed in the vicinity of all the die storage portions 47 via the communication pipes 52. Then, the compressed air that has flowed into the communication pipe 51 is ejected from the ejection nozzle 25 through the communication hole 29 (see FIG. 1). When the compressed air is ejected from the ejection nozzle 25, a negative pressure is generated in the residue escape hole 77. Since the punched waste is sucked downward by this negative pressure, the punched waste can be more reliably dropped.

  The above-described operation is a case of punching the plate material W having only the lower surface covered with the protective sheet WS, but the plate material W having only the upper surface covered with the protective sheet WS, or both the upper and lower surfaces of the protective sheet WS. The operation in the case of punching out the plate material W covered with will be described below.

  The plate material W is positioned at a desired appropriate position of the die 9 by a positioning device provided in the turret punch press. When the plate material W is stopped, the cold air supply means 53 (see FIG. 1) generates cold air CA, and the cold air CA is generated by the pipe 57, the communication pipe 59, the communication pipe 61, the horizontal communication pipe 63, and the like. It passes through the vertical communication pipe 65 and flows into a donut-shaped space 71 formed between the punch holder 67 of the punch 5 and the tip of the punch body 69. Further, the cold air CA that has flowed into the space 71 passes through an annular gap 73 formed between the punch holder hole 68 and the tip of the punch body 69 and covers the upper surface of the plate material W. It is sprayed on the upper surface of the protective sheet WS. As a result, the portion of the protective sheet WS that is punched out is cooled and cured. Along with the curing, since the elongation is reduced, the punching process is completely performed and the protective sheet WS is also sheared, so that it is possible to avoid an increase in the punched residue.

  Also in this case, if the compressed air is ejected from the ejection nozzle 25 and a negative pressure is generated in the degassing hole 77 to suck the punched debris downward, the punched debris rises. Can be avoided more reliably.

  When punching the plate material W whose upper and lower surfaces are covered with the protective sheet WS, the annular gap 73 formed between the punch holder hole 68 and the tip of the punch body 69 is used. The operation of blowing the cold air CA onto the upper surface of the protective sheet WS covering the upper surface of the plate material W, and the protective sheet WS covering the lower surface of the plate material W from the nozzles 15 formed on the nozzle cap 11. By using the operation of blowing the cold air CA on the lower surface in combination, even if the plate material W has both the upper surface and the lower surface covered with the protective sheet WS, the shearing process is performed in a complete state. It is possible to more reliably avoid the rise.

  The elongation of the protective sheet WS described above is affected by the cooling temperature. The tendency is shown in FIG. First, the line graph shown below in the figure represents the elongation using a vinyl chloride SPV, and the line graph shown above represents a non-vinyl chloride SPV with a thickness of 100 micrometers. In the case of a vinyl chloride SPV, the elongation is 170 percent at 20 degrees Celsius, 250 percent at 0 degrees Celsius, 302 percent at normal temperature, 330 percent at 40 degrees Celsius, and 360 percent at 60 degrees Celsius. On the other hand, in the case of non-vinyl chloride SPV, the growth is 418 percent at 20 degrees Celsius, 543 percent at 0 degrees Celsius, 620 percent at room temperature, 656 percent at 40 degrees Celsius, and 681 percent at 60 degrees Celsius.

  Therefore, the protective sheet WS becomes smaller in elongation (rate) and becomes easier to shear (cut) as the temperature decreases. For this reason, since the protection sheet WS is easily sheared by spraying the cold air CA at the time of punching and lowering the temperature as in the present invention, it is possible to avoid an increase in the punching waste.

  The present invention is not limited to the above-described embodiments, but can be modified, improved, and changed within the scope of the technical idea of the above-described invention.

FIG. 1 is a front view of a part of a plate material punching apparatus according to an embodiment of the present invention in a cross-sectional view. It is a top view of the board | plate material punching apparatus which concerns on embodiment of this invention. It is a section front view showing the important section of the board punching device concerning an embodiment of the invention. It is a perspective view which shows the principal part of the board | plate material punching apparatus which concerns on embodiment of this invention. It is a top view which shows the principal part of the board | plate material punching apparatus which concerns on embodiment of this invention. It is the front view which notched a part of principal part of the board | plate stamping apparatus which concerns on embodiment of this invention. It is a bottom view of the principal part of the board | plate material punching apparatus which concerns on embodiment of this invention. It is a VIII-VIII cross-sectional arrow view of FIG. It is the front view which made some sectional views the board | plate material punching apparatus which concerns on another embodiment of this invention. It is a figure which shows the relationship between elongation of a protection sheet, and temperature. It is a cross-sectional front view which shows the operation | movement by the board | plate material punching apparatus in a prior art. It is a figure explaining the state of extension of a protection sheet in the case of carrying out punching continuously. It is a figure explaining the state of extension of a protection sheet in the case of carrying out punching continuously. It is a figure explaining the state in which the protection sheet remained without being sheared when continuously punching. It is a figure explaining the state of the dregs which became suspended by the protective sheet which remained without being sheared when carrying out the punching process continuously. It is a figure explaining the state which carries out the punching process continuously. It is a figure explaining the state of extension of a protection sheet in the case of carrying out punching continuously. It is a figure explaining the state of the dregs which became suspended by the protective sheet which remained without being sheared when carrying out the punching process continuously.

Explanation of symbols

5 Punch 7 Die Holder 9 Die 11 Nozzle Cap 15 Nozzle 17 Chamber 21 Communication Pipe 25 Jet Nozzle 53 Cold Air Supply Means 67 Punch Holder 68 Punch Holder Hole 69 Punch Body 75 Die Hole 77 Dreg Hole 79 Dreg Discharge Hole CA Cold Air W Plate Material WP Sheet metal WS protective sheet

Claims (7)

A method of punching a plate covered with a protective sheet,
Blowing cold air onto the punched portion of the plate material;
Cooling and curing the protective sheet of the punched portion; and
And a step of punching the plate with a punching die. In the board | plate material punching method of Claim 1,
A plate material punching method, wherein the cold air is blown from the periphery of the die of the punching die to the lower surface of the plate material. In the board | plate material punching method of Claim 2,
A method for punching a plate material, further comprising the step of discharging a punched scrap from a dreg hole of the die by generating a negative pressure in a lower portion of the die. In the board | plate material punching method of Claim 1,
A plate material punching method, wherein the cold air is blown onto the upper surface of the plate material from a punch of the punching die. In the board | plate material punching method of Claim 4,
A plate material punching method, wherein the cold air is blown onto an upper surface of the plate material from a gap between a punch holder hole formed in a punch holder of the punch and a punch body of the punch. A device for punching a plate covered with a protective sheet,
A die and a punch for punching a plate covered with a protective sheet;
A nozzle that is provided around the die and blows cool air to the lower surface of the plate;
A communication pipe for communicating cold air to the nozzle;
And a cold air supply means for supplying cold air to the communication pipe. In the board | plate material punching apparatus of Claim 6,
A plate material punching device, wherein a plurality of the nozzles are provided on a ring-shaped nozzle cap.

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