JP4104255B2 - Punch press stripper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stripper for a punch press.
[0002]
[Prior art]
A schematic configuration of a punch press for punching and forming a plate material between an upper die and a lower die will be described with reference to FIG. 3, and problems in forming the punch press with a conventional stripper will be described with reference to FIG. The stripper presses the upper surface of the plate 26 to hold the conveying height of the plate 26 during molding, and facilitates the release of the punch die 31 from the plate 26 after completion of molding.
The punch press includes a press unit 51, a control device 29, a die magazine 27 device (hereinafter referred to as magazine 27), an automatic die changer (hereinafter referred to as ATC 28), and a table device (hereinafter referred to as XY table 30). Called). The press unit 51 is a device that punches holes in a metal plate (hereinafter referred to as a plate 26) as a workpiece or forms a groove or a recess based on a command signal from the control device 29.
[0003]
The press unit 51 has a punch shaft 52, a die shaft 53, and a stripper shaft 54, and each shaft has a punch shaft cylinder 6, a die shaft cylinder 22, and a stripper shaft cylinder 15 as hydraulic actuators. The pressing force of the punch shaft 52 is generated independently by the punch shaft piston 1, the pressing force of the die shaft 53 is generated by the lower die shaft piston 19, and the pressing force of the stripper shaft 54 is generated independently by the stripper shaft piston 10. The central portion of the stripper shaft piston 10 is hollow in the longitudinal direction, and the tip of the punch shaft piston 1 expands and contracts in the hollow portion. A punch die 31 is detachably fitted on the lower surface of the punch shaft piston 1, a lower die die 33 is detachably fitted on the upper surface of the lower die shaft piston 19, and a stripper 32 is detachably fitted on the lower surface of the stripper shaft piston 10.
[0004]
An electromagnetically operated punch shaft servo valve 4 for controlling the pressure oil to the punch shaft pressurizing chamber 8 and the punch shaft lifting chamber 9 is disposed between the punch shaft cylinder 6 and a hydraulic source (not shown). Yes. Further, a stripper shaft servo valve 13 for controlling the pressure oil to the stripper shaft pressurizing chamber 17 and the stripper shaft pull-up chamber 18 is disposed between the stripper shaft cylinder 15 and the hydraulic power source. Further, a lower die axis servo valve 20 for controlling the pressure oil to the lower die axis pressurizing chamber 24 and the lower die axis pulling lower chamber 25 is disposed between the lower die axis cylinder 22 and the hydraulic pressure source. Each servo valve is an example of a driving unit for each axis. Further, the control device 29 outputs a punch axis servo valve command Cp, a stripper axis servo valve command Css, and a die axis servo valve command Cd for instructing the stroke or pressure of each axis to the servo valve for each axis.
[0005]
As detectors, there are a punch axis position detector 5, a stripper axis position detector 14, and a lower die axis position detector 21 that detect the positions of the punch axis piston 1, the stripper axis piston 10, and the lower die axis piston 19, respectively. , Provided in the vicinity of each piston. Further, the punch axis piston position Pp, the stripper axis piston position Ps and the die axis piston position Pu detected by each position detector are input to the control device 29.
The control device 29 calculates a change command of the temporal expansion / contraction amount of each axis of the press unit 51 based on a work condition set in advance by an operator, and the calculated change command and the detected piston position Pp of each axis. , Ps, Pu are output servo valve commands Cp, Css, Cd for each axis such that the deviation value becomes zero, and the operation pattern of each axis is controlled.
[0006]
In the punch press described above, when the plate 26 is actually formed, first, the lower surface of the stripper 32 and the upper surface of the lower die mold 33 are positioned in contact with the upper surface and the lower surface of the plate 26, respectively. After the plate 26 is sandwiched between the stripper 32 and the lower die mold 33, the punch mold 31 is lowered to form between the lower surface of the punch mold 31 and the upper surface of the lower die mold 33. At this time, the punch die 31 moves up and down a die passage portion 77 provided penetrating from the upper surface to the lower surface of the stripper 3 2. Further, depending on the molding shape, the lower die 31 may be raised and molded after the lower surface of the stripper 32 and the lower surface of the punch die 31 are in contact with the upper surface of the plate 26 and positioned.
[0007]
A conventional method for forming a punched hole in the vicinity of the upper emboss 70 as shown in FIG. The molded shapes in which the convex portion of the circular depression is formed on the upper surface of the plate and the convex portion is formed on the lower surface of the plate are referred to as an upper emboss 70 and a lower emboss (not shown), respectively.
As shown in FIG. 4, when the punching hole is formed near the forming portion after the upper embossing 70 is formed, the lower surface of the stripper 32 interferes with the upper embossing 70 to form the punching hole as shown by a two-dot chain line. There are things that cannot be done. For this reason, as shown in FIG. 5A, a punching hole 71 is first formed, and then, the lower surface of the stripper 32 is brought into contact with the plate 26 in the vicinity of the punching hole 71 as shown in FIG. Then, the upper emboss 70 is formed.
[0008]
[Problems to be solved by the invention]
However, the conventional method for forming a punch press using the stripper 32 has the following problems. After the punching hole 71 is formed, if other forming is performed in the vicinity of the punching hole 71, the position of the punched hole 71 that has already been formed is shifted or the hole shape is changed due to elastic deformation of the plate 26 in the vicinity of the punching hole 71. There is a problem that the predetermined positional accuracy of the punching hole 71 and the shape accuracy of the hole cannot be obtained due to deformation.
[0009]
The present invention has been made paying attention to the above-mentioned problems, and an object of the present invention is to provide a punch press stripper that can obtain excellent forming accuracy.
[0010]
[Means, actions and effects for solving the problems]
To achieve the above object, the first invention is positioned in contact with the upper surface of the word over click, the punch and die passage portion is provided to penetrate from the upper surface to the lower surface in the central portion lift in the punch press of the stripper the workpiece is Ru is formed by,
It has a base portion from the predetermined height of the stripper, and the projecting portion is provided on the base portion for contact with the upper face of the lower end surface side over click,
The protrusion is disposed in a ring shape on the outer edge of the stripper;
In the space between the workpiece upper surface and the base portion, interference with the convex portion formed on the workpiece upper surface is avoided.
[0011]
According to the first invention, the stripper has a protruding portion that protrudes downward from the base portion, and the bottom surface of the protruding portion is in contact with the upper surface of the workpiece during the molding process. At this time, a space excluding the volume of the projecting portion is formed between the workpiece upper surface and the stripper base portion. And by this space, a stripper avoids interference with the convex part of the upper surface of the workpiece | work shape | molded by the front process. As a result, all the inside of the ring-shaped protrusion on the outer edge serves as a relief for avoiding interference, so that the convex part on the upper surface of the workpiece can be brought close to the central part of the stripper, Precision molding can be performed. Thereby, after forming the shape of the convex portion on the upper surface of the workpiece, high-precision cutting, drilling, and molding can be performed, so that the workpiece molding accuracy is excellent.
[0012]
The second invention is Oite the first invention, wherein the ring-shaped protrusion and configured to separate the projecting portion is disposed so as to surround the mold passage portion.
[0013]
According to the second invention, the stripper has the central protrusion, and the lower surface of the central protrusion is in contact with the upper surface of the workpiece during positioning. At this time, a space is formed between the upper surface of the workpiece and the stripper base portion outside the central protrusion. And by this space, a stripper avoids interference with the convex part of the upper surface of the workpiece | work shape | molded by the front process. As a result, since the upper surface of the workpiece can be cut with high accuracy after the shape of the convex portion is formed, drilling and molding can be performed, the molding accuracy of the workpiece is excellent.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings.
The stripper of the first embodiment shown in FIG. 1A is a central projecting portion projecting from the base portion 72 of the stripper 32 at a portion surrounding the die passage portion 77 where the punch die 31 in the central portion of the stripper 32 moves up and down. 73. The central protrusion 73 has a lower surface 74 that contacts the upper surface of the plate 26. FIG. 1B shows that the stripper 32 of this embodiment is in contact with the plate 26 while avoiding interference with the convex portion of the upper emboss 70, and the punch die 31 is located between the lower die die 33 and the upper die die 33. A state in which punched holes are formed in the vicinity of the emboss 70 is shown.
[0017]
According to the present embodiment, the stripper 32 has the central protrusion 73, and the lower surface 74 of the central protrusion 73 abuts on the upper surface of the plate 26 and is positioned during the molding process. When the stripper 32 is positioned by bringing the lower surface 74 into contact with the upper surface of the plate 26, the upper surface of the plate 26 and the base portion 72 are located in the region between the base portion 72 and the lower surface 74 in the outer edge direction. A space is created between them. Then, interference between the convex portion of the upper emboss 70 formed in the previous step and the stripper 32 is avoided by this space.
At the time of actual forming, first, the upper emboss 70 is formed, and in the subsequent process, the stripper 32 of the present embodiment is positioned in contact with the upper surface of the plate 26 while avoiding interference with the convex portion of the upper emboss. Can be molded. Further, even if a plurality of embosses having different heights are formed on the plate 26, the punching hole 71 can be formed at the end thereof. As a result, since the plate 26 is elastically deformed and there is no subsequent molding that causes deterioration of the hole accuracy, the position accuracy and shape accuracy of the punched hole 71 are excellent.
[0018]
Next, a second embodiment will be described with reference to FIG. The stripper 32 of the present embodiment shown in FIG. 2A includes the central protrusion 73 described with reference to FIG. 1 and a ring-shaped outer edge protrusion 75 having a predetermined height provided on the outer edge of the stripper 32. When positioning the stripper 32 in contact with the plate 26, the lower surface 76 of the outer edge protruding portion 75 contacts the upper surface of the plate 26 simultaneously with the lower surface 74 of the central protruding portion 73. FIG. 2B shows that the stripper 32 of this embodiment is in contact with the plate 26 while avoiding interference with the convex portion of the upper emboss 70, and the punch die 31 is located between the lower die die 33 and the upper die die 33. A state in which punched holes are formed in the vicinity of the emboss 70 is shown.
[0019]
According to this embodiment, the stripper 32 has the center protrusion 73 and the outer edge protrusion 75, and the lower surface 74 of the center protrusion 73 and the lower surface 76 of the outer edge protrusion 75 abut against the upper surface of the plate 26 during the molding process. Positioned in contact. At this time, an annular space is formed between the central protrusion 73 and the outer edge protrusion 75. This space avoids interference between the convex portion of the upper emboss 70 formed in the previous step and the stripper 32.
At the time of actual forming, first, the upper emboss 70 is formed, and in the subsequent process, the stripper 32 of the present embodiment is positioned in contact with the upper surface of the plate 26 while avoiding interference with the convex portion of the upper emboss. Can be molded. Even if a plurality of embosses having different heights are formed on the plate 26, the punched hole 71 can be formed at the end thereof. As a result, since the plate 26 is elastically deformed and there is no subsequent molding that causes deterioration of the hole accuracy, the position accuracy and the shape accuracy of the punched hole 71 are excellent.
Further, when the punching hole 71 is formed in the very vicinity of the upper emboss 70, it is difficult to ensure the area of the lower surface 74 of the central projecting portion 73 large enough to suppress the displacement of the plate 26. Since the stripper 32 according to the embodiment has a sufficient area by providing the outer edge protrusion 75, the plate 26 is not displaced during molding, and excellent molding accuracy is obtained.
[0020]
In the present embodiment, the example in which the center protrusion 73 and the outer edge protrusion 75 are provided has been described. However, depending on the molding shape or molding method, only the outer edge protrusion 75 is provided and the center protrusion 73 is required. Even with the stripper that does not, interference with the convex portion of the plate 26 can be avoided, and the same effect can be exhibited.
In the first and second embodiments, the example in which the punching hole 71 is formed in the vicinity of the upper embossing 70 has been described. However, the molding is performed such that the upper surface of the plate 26 is convex in the previous step. The stripper 32 of the first and second embodiments can exhibit the same effect even when forming a burring that requires high accuracy in a subsequent process. The burring has a cylindrical bowl-like shape having a predetermined height substantially perpendicular to the surface of the plate 26.
[0021]
As described above, according to the present invention, the stripper has a predetermined height at the base portion of the stripper, and the protruding portion where the lower end surface of the stripper comes into contact with the upper surface of the workpiece. At the time of forming, the lower surface of the projecting portion is positioned in contact with the upper surface of the workpiece. At this time, a space excluding the volume of the projecting portion is formed between the workpiece upper surface and the stripper base portion. And by this space, a stripper avoids interference with the convex part of the upper surface of the workpiece | work shape | molded by the front process. Thereby, after the shape of the convex portion is formed on the upper surface of the workpiece, the punching processing and the molding processing requiring high accuracy can be performed in the vicinity of the forming portion, so that the workpiece forming accuracy is excellent.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a first embodiment of a stripper that avoids interference with a forming section.
FIG. 2 is an explanatory diagram of a second embodiment of a stripper that avoids interference with a forming portion.
FIG. 3 is a schematic explanatory diagram of a punch press.
FIG. 4 is an explanatory view of problems at the time of molding by a conventional stripper.
FIG. 5 is an explanatory view of a molding process using a conventional stripper.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Punch shaft piston, 4 ... Punch shaft servo valve, 5 ... Punch shaft position detector, 6 ... Punch shaft cylinder, 8 ... Punch shaft pressurizing chamber, 9 ... Punch shaft pulling chamber, 10 ... Stripper shaft piston, 13 ... stripper shaft servo valve, 14 ... stripper shaft position detector, 15 ... stripper shaft cylinder, 17 ... stripper shaft pressurizing chamber, 18 ... stripper shaft pulling chamber, 19 ... lower die shaft piston, 20 ... lower die shaft servo valve 21 ... Lower die axis position detector, 22 ... Lower die axis cylinder, 24 ... Lower die axis pressurizing chamber, 25 ... Lower die axis pulling upper chamber, 26 ... Plate, 27 ... Mold magazine, 28 ... ATC, 29 ... Control device, 30 ... XY table, 31 ... Punch die, 32 ... Stripper, 33 ... Lower die die, 51 ... Press part, 52 ... Punch shaft, 53 ... Die shaft, 54 ... Stripper shaft, 70 ... Upper emboss 71 ... perforations, 72 ... base portion, 73 ... central projecting portion, 74 ... central projecting lower surface, 75 ... outer projecting portion, 76 ... outer projecting lower surface, 77 ... die passage portion.

Claims (2)

Is positioned abut against the upper surface of the word over click, the punch press of the stripper the workpiece is Ru is formed by punch and die passage portion is provided to penetrate from the upper surface to the lower surface in the central portion is raised and lowered,
It has a base portion from the predetermined height of the stripper, and the projecting portion is provided on the base portion for contact with the upper face of the lower end surface side over click,
The protrusion is disposed in a ring shape on the outer edge of the stripper;
A punch press stripper characterized by avoiding interference with a convex portion formed on the workpiece upper surface in a space between the workpiece upper surface and the base portion. In the punch press stripper according to claim 1,
Punch press stripper, characterized in that another projecting portion is disposed so as to surround the mold passage portion and the ring-like projection.

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