JPH07100189B2 - Overcut processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention is designed to divide a string-like punched residue produced when a plate material is subjected to additional cutting by a press such as a turret punch press. Regarding the overcut processing method.

(Prior Art) Conventionally, when performing slotting on a plate material using a press such as a mechanical turret punch press, an adjusting device is attached to the ram for vertically moving the punch to adjust the stroke of the ram. I adjusted it. The string-shaped scraps produced by the additional cutting of the slotting process are wound around the holes in the die and the die support and collected. In order to process the string-shaped scraps that have been wound around the tuna, the worker has used the scissors for plate material to separate the string-shaped scraps each time.

(Problems to be Solved by the Invention) However, the above-described conventional processing for removing the string-like residue has a problem that the work of the operator is difficult and time-consuming.

The object of the present invention was proposed in order to solve the problem in view of the above circumstances, and it is possible to divide the string-like scraps generated by the overcutting processing at predetermined intervals so that they can be easily processed. It is to provide a post-cutting processing method.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a lower end portion of a punch that cooperates with a die to form a slot in a plate material with a height difference. When forming the slot in the plate material while repeating the step of raising and returning the punch before the upper end of the formed cutting edge portion shears the plate material and the step of stepwise feeding the plate material, the slot is formed. This is a post-cutting method in which a suitable number of points along the power path are preliminarily drilled.

(Operation) By adopting the method of the present invention, before the post-cutting process, holes are preliminarily formed at a suitable number of points along the path where the slot should be formed by the post-cutting process. It is divided into short pieces at a predetermined interval without being wound up. Therefore, it becomes easier to remove the residue.

(Example) FIG. 1 is a perspective view of a turret punch press capable of carrying out the method of the present invention.

In Fig. 1, the turret punch press 1 is CAD / CAM.
Contacted 3 and located in the sheet metal processing line.

The turret punch press 1 shown in this example has substantially the same shape as a normal turret punch press, but its configuration will be briefly described.

The turret punch press 1 has a frame 5, and an upper turret and a lower turret that rotate around a vertical axis (Z axis) are arranged at predetermined intervals above and below the inside of the frame 5. A large number of punches are attached to the plane (XY) position of the upper turret, and a large number of dies are attached to the plane position of the lower turret facing the punches.

A cylinder device 7 having a vertically movable ram is provided above the frame 5. The ram is arranged above the upper turret and presses the punch located below it towards the die. A Y-axis guide rail 9 is provided on the side surface of the frame 5. A moving member guided in the Y-axis direction by a Y-axis servomotor is provided on the Y-axis guide rail 9, and a table 11 having a free bearing is fixed to the upper surface of the moving member.

A carriage 13 is provided at the Y axis end of the table 11 so as to be movable in the X axis direction by an X axis servo motor.
The carriage 13 is provided with a plate material clamp device that holds the plate material W placed on the table 11 and guides the plate material W in the XY plane.

In the turret punch press 1 having such a configuration, the NC device 15 guides the carriage 13 in the XY plane, and the cylinder device 7 is driven at appropriate times to perform predetermined drilling at a predetermined position of the plate W. Is possible.

FIG. 2 is a block diagram of a control system showing an outline of the NC device 15 and an outline of the cylinder device 7 and its hydraulic circuit 17.

In FIG. 2, the cylinder device 7 has a piston 7b in a cylinder 7a, and the piston 7b has a vertical (Z) position.
A ram 7c that is movable in the direction is connected. Reference code 1
Reference numerals 9, 21 and 23 respectively denote a plate material clamping device, a punch and a die. On the lower surface of the cylinder 7a, attach a rolling wheel to the ram 7c.
And a pulse encoder 25 for detecting the movement of the ram 7c with a pulse signal PS is attached.

The hydraulic circuit 17 includes a hydraulic pump OP, a servo valve 27 connected to the upper chamber and the lower chamber of the cylinder 7a via pipes OL ₁ and OL _2.
Is configured. The pipe OL ₁ is provided with a pressure detector 29 for detecting the hydraulic pressure of the pipe with an electric signal.

The NC device 15 has an NC data input section 31, a main control section 33, an XY axis command section 35, a Z axis command section 37, a position detection section 39, and a servo valve control section 41. .

The NC data input unit 31 is connected to the CAD / CAM 3 offline or online, receives NC data for controlling the turret punch press from this, and sends this data to the main control unit.
Provide to 33.

The main control unit 33 is operated by an operating system, receives NC data from the NC data input unit 31, and mainly performs position control of the plate W and drive control of the cylinder device 7. The main controller 33 is connected to various sensors, limit switches, and other various actuators, and controls the turret punch press 1 as a whole.

The XY-axis command section 35 receives predetermined position control data from the main control section 33 and drives the X-axis and Y-axis servomotors to control the positioning of the plate W in the XY plane.

The Z-axis command unit 37 receives the Z-axis command data from the main control unit 33 and outputs the data of the position Zn and the speed Vn for driving the servo valve.

The position detector 39 integrates the pulse signal PS output from the pulse encoder 25 to detect the current position Z of the ram 7c. The pulse encoder is of a type that outputs a two-phase pulse signal having a phase difference of 1/4, and the position detector 39 can also know the moving direction of the ram 7c based on the two-phase pulse signal.

The servo valve control unit 41 sends the position data from the Z-axis command unit 37.
Zn and velocity data Vn are input, and the current position Z of the ram 7c is input from the position detector 37. Servo valve controller 41
Controls the servo valve 27 to a predetermined position and a predetermined opening based on these input values. As described above, the stroke of the punch 21 can be controlled by freely controlling the ram 7c.

The specific structure of the punch 21 and the die 23 as the mold shown in FIG. 2 is shown in detail in FIG. That is, in FIG. 3, the punch 21 is inserted into the punch guide 43 having a hollow cylindrical shape as the punch assembly in alignment with the positioning guide key 45, and is fixed by the screw 47 or the like.
The punch guide 43 is provided on the outer peripheral portion of the punch guide 43 with a plate material W.
A soft spring 49 is urged outward to float from above.

The head 51 of the punch 21 is fixed to the upper portion of the punch 21 with screws 53. A strip spring 55 that urges the punch 21 outward so as to pull out the punch 21 from the plate W is provided on the outer peripheral portion of the head portion 51. A stripper plate 57 having a hole having the same shape as that of the cutting edge at the bottom of the punch 21 is screwed to the punch guide 43.
It is fixed at 59 etc.

The lower blade edge portion of the punch 21 in FIG. 3 is, for example, a rectangular blade having a different height. In FIG. 3, the front lower edge blade portion 61 of the high-height blade provided on the front side in the traveling direction of the plate material W, that is, the right end is formed higher than the rear-side upper edge blade portion 63 of the high-height blade provided on the rear side in the traveling direction of the plate material W. I am doing it. Moreover, an intermediate blade portion 65 having, for example, an arbitrary curved shape is formed and connected between the front lower edge blade portion 61 and the rear upper edge blade portion 63 of the different height blade. The curved intermediate blade portion 65 has, for example, a radius of curvature R ₁ and a radius of curvature R ₂ , and is connected to the front upper edge blade portion 63 and the front lower edge blade portion 61. The intermediate blade portion 65 may have a linear shape instead of a curved shape.

With the above configuration, when the plate material W is subjected to the additional cutting, for example, the punched scraps enter the die 23 side while drawing an arc with the curved intermediate blade portion 65.

A die 23 corresponding to the punch 21 is fitted to the lower turret 67 with the axes thereof aligned with each other as shown in FIG. The back relief portion 69 of the die 23 is formed in, for example, an inverted conical shape in order to prevent catching of punched scraps.
Thus, the punched residue does not get caught in the back escape portion 69 of the die 23. Therefore, the punched residue is
It can be easily dropped below 23.

A plate material W having a thickness d to be additionally cut is shown in FIGS. 4 and 5. A slot portion 71 having a length l ₁ and a width l ₂ indicated by a two-dot chain line in the plate material W in FIGS. 4 and 5 is a portion to be subjected to the additional cutting. In the longitudinal direction of the slot portion 71 (left and right direction in FIGS. 4 and 5), for example, five elliptical holes having a predetermined interval l ₃ and a rectangle of approximately l ₂ and a major axis of approximately l _4. Pre-drill H _{1 to} H ₅ .

Then, the slot portion 71 is formed in the plate material W by performing the additional cutting process from the holes H ₁ to H ₅ of the plate material W. At this time, when the holes H ₁ to H _{2 are} additionally cut, the punched void Wa is cut off in a short state. In addition,
From H ₂ to H _3, so that the dregs Wa omission by being additionally cut processed until ......... H ₄ ~H ₅ is Setsu落in each case automatically die 23.

FIG. 6 shows an example of a state in which the debris Wa generated by the additional cutting process is cut off. FIG. 6A shows a state in which the front lower end blade portion 61, which is the blade edge portion of the punch 21, and the curved intermediate blade portion 65 are punched into the pre-drilled hole H ₁ of the plate material W. From FIG. 6A, punching is performed while controlling the punch 21 to a predetermined stroke, and in the state of FIG. 6B, punching is performed between the holes H ₁ and H ₂ . The state in the middle is shown. The post-cutting process proceeds from (B) of FIG. 6, and (C) of FIG. 6 shows a state in which the hole H ₂ is post-cut. That is, the punching residue Wa punched out by cutting the hole H ₂ becomes a short arc in the die 23 as shown in FIG. 6 (C). In this way, by repeating the steps from (A) to (C) in FIG. 6, the short arc-shaped debris Wa is cut off.

Therefore, the punched-out void Wa is not a conventional wound one but a short arc automatically, so that the post-processing of the punched-out Wa becomes very easy.

The strokes of the front lower edge blade portion 61 and the rear upper edge blade portion 63 of the high-height blade, which is the blade edge portion of the punch 21 in the post-cutting processing described with reference to FIGS. The state is as shown in the figure. That is, in FIG. 7, the front lower edge blade portion 61 and the rear upper edge blade portion 63 of the different-height blade are respectively indicated by dots.
The cylinder device 7 descends from A and B while controlling the stroke length of the ram 7c to move the position 61a of the front lower edge blade portion 61 to the plate material W.
Stroke S in which the position 61b is located below the thickness t of the plate W, and the position 61b is located within the thickness t of the plate W when it is further raised.
As described in FIG. 6, the punching cut Wa is cut off shortly by performing the additional cutting processing while controlling by.

The present invention is not limited to the above-mentioned embodiment,
It can be implemented in other modes by making appropriate changes. For example, although an ellipse is taken as an example of the shape of the holes formed in the plate material W in advance at predetermined intervals, other shapes such as a circle may be used other than the ellipse.
Also, the stroke of the front lower edge blade portion 61 of the different height blade may be set longer than the stroke length shown in FIG.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, before the post-cutting process is performed on the plate material, the plate material can be formed at appropriate positions on the path where the slots should be formed by the post-cutting process. Since the holes have been drilled in advance, the debris punched out during the post-cutting process can be automatically cut off in the form of a short string without winding around. As a result, the post-processing of the punched short string-like scraps is much easier than the conventional one.

[Brief description of drawings]

FIG. 1 is a perspective view of a hydraulic turret punch press according to an embodiment for carrying out the method of the present invention. FIG. 2 is a block diagram showing an example of a control circuit of the hydraulic turret punch press of FIG. FIG. 3 is an enlarged front sectional view showing an example of a die used in the hydraulic turret punch press of FIG. FIG. 4 is a plan view showing an example of a plate material used in this embodiment, and FIG. 5 is a sectional view taken along line VV in FIG. 6A to 6C are main operation diagrams in this embodiment. FIG. 7 is an explanatory diagram for explaining the main operation. [Explanation of the symbols showing the main parts of the drawing] 1 ... Turret punch press, 7 ... Cylinder device 15 ... NC device, 21 ... Punch 23 ... Die, 61 ... Front lower blade 63 ... Rear Side top edge

Claims (1)

[Claims] 1. A punch which raises a punch before shearing the plate material by an upper end portion of a cutting edge portion formed with a height difference at a lower end portion of a punch which cooperates with a die to form a slot in the plate material. When forming a slot in a plate material while repeating the step of returning and the step of feeding the plate material step by step, punching is performed in advance at a suitable number of points along the path where the slot should be formed. Processing method.