JPS63130228A - Ripping method by hydraulic press - Google Patents

Abstract

PURPOSE:To realize the working causing no drop trace on the seam at the time of ripping by adjusting the stroke of a punch with the stroke control of a hydraulic cylinder in the case of performing a ripping on a plate stock by the punch equipped with the blade of different height. CONSTITUTION:A front side lower end blade part 61 of different height, an intermediate blade part 65 and rear side upper end blade part 63 are formed at the lower end of the punch 21 cooperating with a die 23. A turret punch press vertically moves the punch 21 interlocking with the motion of a hydraulic ram 7c, performing a ripping on a plate stock W. In case of working, the ripping is executed on the plate stock W by repeating to control the ram 7c at the specified stroke in order to perform the shear of the plate stock W by the blade parts 61, 65. The working is completed by performing the stroke control of the ram 7c in the stroke cutting the blade part 63 in the plate stock W so as to cut off the plate stock W by the blade part 63. It is thus possible to cause no drop on the seam at the ripping time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for cutting a sheet material using a hydraulic press, such as a hydraulic press such as a turret punch press.

(Prior art) Conventionally, when slotting or cutting a plate material using a press such as a turret punch press, the cutting edge of the die or punch is formed into a long or rounded corner shape. He was continuously making single shots.

(Problem to be Solved by the Invention) However, in the conventional turret punch press mentioned above, the stroke of the ram that moves the punch up and down cannot be easily adjusted, so the slotting process is performed by single punching with a constant stroke. Otherwise, cutting processing had to be performed.

Therefore, in single-shot punching, the shape of the punch's cutting edge is long or rounded, so burrs and whiskers can occur at the seam due to machining errors in the mold and press and variations in accuracy due to temperature changes. There is a problem that residual impressions remain.Therefore, the impressions such as burrs and whiskers that occur at the seams must be corrected in the subsequent process, which requires additional man-hours such as deburring. , resulting in a decrease in product accuracy and an increase in man-hours.

Furthermore, there is also the problem that the product may be damaged by, for example, hair.

The purpose of the present invention was proposed in order to improve the problem in view of the above-mentioned circumstances, and it is an object of the present invention to easily adjust the stroke control by the vertical movement of the punch in a hydraulic press to prevent the occurrence of "sloping" impressions. The object of the present invention is to provide a method for machining additional cuts using a hydraulic press.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, the heights of the upper edge, intermediate edge and lower edge are different in order to perform additional cutting on a plate material in cooperation with a die. A punch with a continuous cutting edge is moved up and down by the operation of a hydraulic cylinder in a hydraulic press,
The hydraulic cylinder is repeatedly controlled to a predetermined stroke to shear the plate material using the lower end blade and the intermediate blade of the punch, and additional cutting is performed on the plate material, and then the plate material is cut off using the upper end blade of the punch. Further cutting is performed by controlling the stroke of the hydraulic cylinder during the stroke of cutting the upper end blade into the plate material.

(Function) By adopting the additional cutting method of the present invention and adjusting the stroke of the punch by controlling the stroke of the hydraulic cylinder, additional cutting can be performed easily and easily. What's more, there are no ``drips'' at the joints when cutting, so the process is done neatly.

(Example) FIG. 1 is a perspective view of a turret punch press in which the method of the invention can be practiced.

In FIG. 1, the turret punch press 1 has a CAD
- It is connected to CAM3 and is located in the sheet metal processing line.

The turret punch press 1 shown in this example has approximately the same shape as a normal turret punch press, and its configuration will be briefly explained.

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

A cylinder device 7 is provided above the frame 5 and includes a ram that can move up and down. A ram is located above the upper turret and presses a punch located below it toward the die. A Y-axis guide rail 9 is provided on the side surface of the frame 5. The Y-axis guide rail 9 is provided with a moving member guided in the Y-axis direction by a Y-axis servo motor, and a table 11 equipped with 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 and is movable in the X-axis direction by an X-axis servo motor. The carriage 13 is provided with a plate clamp device that grips the plate W placed on the table 11 and guides the plate W in the xY plane.

The turret punch press 1 having such a configuration includes an NC device 15.
By guiding the carriage 13 in the XY plane and driving the cylinder device 7 at the appropriate time, the plate material W is
It is possible to drill a predetermined hole at a predetermined position.

FIG. 2 is a block diagram of a control system showing an overview of the NG device 15 and an overview 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 a ram 7C that is movable in the vertical (Z) direction is connected to the piston 7b. Reference numerals 19, 21, and 23 indicate a plate material clamping device, a punch, and a die, respectively. A pulse encoder 25 is attached to the lower surface of the cylinder 7a, which brings a rolling wheel into contact with the ram 70 and detects the movement of the ram 7C using a pulse signal PS.

The hydraulic circuit 17 includes a hydraulic pump ○P and the cylinder 7a.
It is configured with a servo valve 27 connected to the upper chamber and the sky through the lines 1OL+ and ○L2. Piping office lady
+ is provided with a pressure detector 29 that detects the oil pressure of the pipe using an electrical signal.

The NCvii 15 includes an NC data input section 31, a main control section 33, an XY wheel axle command 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, and provides this data to the main control unit 33.

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

The XY wheel axle command 35 receives predetermined position control data from the main control section 33 and drives the X-axis and Y-axis servo motors, thereby controlling the positioning of the plate material W within the XY plane. .

The Z-axis command section 37 receives Z-axis command data from the main control section 33 and sets the position izn for driving the servo valve.

Outputs speed vn data.

The position detection section 39 integrates the pulse signal PS output from the pulse encoder 25 and detects the current position Z of the ram 7C. The pulse encoder is of a type that outputs two-phase pulse signals with a phase difference of 1/4, and the position detection unit 39
It is also possible to know the moving direction of the ram 7C based on these two-phase pulse signals.

The servo valve control section 41 receives position data ln and speed data Vn from the Z-axis command section 37, and also receives the current position Z of the ram 7C from the position detection section 37. The servo valve control section 41 controls the servo valve 27 to a predetermined position and to a predetermined opening degree based on these input values.

In this way, by freely controlling the ram 7C,
The stroke of the punch 21 can be controlled.

The specific structure of the punch 21 and die 23 as the mold shown in FIG. 2 is shown in detail in FIG. 3. That is, in FIG. 3, the punch 21 is inserted into a punch guide 43 having a hollow cylindrical shape as a punch assembly along with a positioning guide key 45, and is fixed with a screw 47 or the like. A lift spring 49 is interposed on the outer periphery of the punch guide 43 to bias it outward in order to lift the punch guide 43 from the plate material W.

At the top of the punch 21, the head 51 of the punch 21 is attached to a screw 53.
It is fixed. A strip spring 55 is provided on the outer periphery of the head 51 and biased outward so as to remove the punch 21 from the plate material W.

A stripper plate 57 having a hole having the same shape as the cutting edge at the lower part of the punch 21 is fixed to the punch guide 43 with a screw 59 or the like.

The cutting edge portion of the punch 21, which is the lower part in FIG. 3, has, for example, a rectangular shaped blade with an unusual height. In FIG. 3, the front lower end blade part 61 of the unusual height blade provided on the front side, that is, the right end in the traveling direction of the plate material W is formed higher than the rear upper end blade part 63 of the unusual height blade provided on the rear side in the traveling direction of the plate material W. It is. Moreover, an intermediate blade part 65 having an arbitrary curved shape, for example, is formed between the front lower end blade part 61 and the rear upper end blade part 63 of the blade of different height and are connected to each other. The curved intermediate blade part 65 has, for example, one with a radius of curvature R1 and the other with a radius of curvature R2, and is connected from the rear upper end blade part 63 to the front lower end blade part 61. Note that the intermediate blade portion 65 may have a straight shape instead of a curved shape.

With the above configuration, when the plate material W is further cut, for example, the punched scraps enter the die 23 side while drawing a circular arc at the curved intermediate blade portion 65.

The lower turret 67 has a die 23 corresponding to the punch 21.
The axes are aligned and the two are fitted as shown in FIG. The six relief portions of the die 23 are formed, for example, in the shape of an inverted cone in order to prevent punched scraps from getting caught. As a result, the punched scraps will not be caught in the relief portion 69 of the die 23. Therefore, the punched dregs can easily fall below the die 23.

Next, the method of performing additional cutting on the plate material W will be explained with reference to FIG. The head 51 of the bunch 21 is pressed. The state in which the head 51 of the bunch 21 is pressed is shown in FIG. enters the die 23, and the plate material W is cut by the curved intermediate blade portion 65. In the state shown in FIG. 4(B), the ram 7C is moved slightly upward by the cylinder device 7 as shown in FIG. 4(C). By raising the bunch 21, the front lower end blade portion 61 of the bunch 21 is positioned within the thickness t of the plate material W.

Next, the state of FIG. 4(C) returns to FIG. 4(B), and the state of FIG. 4(B) and FIG. 4(C), that is, the position of the front lower end blade portion 61 of the bunch 21 Further machining is repeated by controlling the hydraulic cylinder device 7 so that the ram 7C moves up and down at the positions shown in FIGS. 4(B) and 4(C).

When, for example, scraps Wa are cut off from the plate material W, the stroke length of the ram 7C is controlled by the cylinder device 7 so as to be longer than the stroke length of the ram 7C in FIGS. 4(B) and 4(C).

That is, the position of the rear upper end blade portion 63 of the punch 21 is changed to the fourth position.
In (C) of the figure, by positioning the plate material W more downwardly than the thickness of the plate material W, the rear upper end blade part 63 of the blade of an abnormal height cuts off the scraps Wa of the plate material W from the plate material W and performs additional cutting. ends.

The state of the front lower end blade part 61 and the rear upper end blade part 63 of the abnormal height blade, which is the cutting edge part of the punch 21, at the lower stroke position with respect to the additional cut machining time explained in FIGS. 4(A) to (D) is This is shown in FIGS. 5A and 5B.

In FIGS. 5A and 5B, points A and B indicate the lower edge portion 61 on the surface side of the irregular height blade before additional cutting. Each position of the rear upper end blade part 63 is represented, and the solid curve shows the locus of the additional cutting process on the front lower end blade part 61, and the one-dot line curve shows the trajectory of the additional cutting process on the rear upper end blade part 63.

In FIG. 5A, the stroke upper end 61a of the front lower end blade portion 61 is within the thickness t of the plate material W, and the lower stroke end 6
1b strokes with a stroke length S below the thickness t of the plate material W, and when cutting off the scraps Wa, the bunch 21
The stroke is made larger than the stroke during additional cutting, and the lower end of the stroke of the rear upper end blade part 63 is controlled to descend to a lower position 163c by the thickness of the plate material W, thereby removing scraps W.
A is cut off from the plate material W.

The example in FIG. 5(B) is almost the same as the example in FIG. 5(A), but the difference from FIG. The additional cutting process is performed in a state where the cut is cut upward from the height t.The other parts are the same as (A> in FIG. 5), so the explanation will be omitted.

By carrying out the above-mentioned cutting process on the plate material, the indentation called "sloping mark" that has conventionally occurred is almost eliminated, and the finishing process can be performed cleanly and with high precision.

In addition, the scraps generated during the additional cutting process enter the die side while drawing an arc along the R part of the curved intermediate blade part, and escape largely at the inverted conical taper part at the back relief part 69 of the die. The scraps Wa are cut off without being caught.

Note that the present invention is not limited to the above-mentioned embodiments,
By making appropriate changes, other embodiments can be implemented. For example, in addition to controlling the stroke of the punch shown in FIG. 5, it is also possible to control and adjust other free curves and stroke lengths.

[Effect of the Invention 1] As understood from the description of the embodiments described above, according to the present invention, in a hydraulic press, a predetermined stroke control by the lower end blade and intermediate blade of the punch is repeated by the stroke control of the hydraulic cylinder, and then When cutting into a plate material with the upper edge blade, we control the stroke of a hydraulic cylinder on the cutting stroke to perform additional cuts on the plate material, making additional cuts simple and easy, and eliminates the problems that previously occurred. There are almost no ``drip'' impressions, resulting in clean and highly accurate cutting.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a hydraulic turret punch press according to an embodiment of the method of the present invention. 2 is a block diagram showing an example of a control circuit of the hydraulic turret punch press of FIG. 1. FIG. FIG. 3 is an enlarged front sectional view showing an example of a mold used in the hydraulic turret punch press of FIG. 1. (Δ) to (D) in FIG. 4 are operation diagrams showing an example of the main operations of the present invention. (A> and (B) in Fig. 5 are explanatory diagrams for explaining the main operations of the present invention.E Explanation of symbols representing main parts in the drawing J1...Hydraulic turret punch press 7...・Cylinder device 15...NC device 17...
Hydraulic circuit 21...Punch 23...Die 61...
・Front lower end blade part 63... Rear upper end blade part 69... Patent attorney Yasu Miyoshi, agent of Ura Escape Department No. 1! i Garden 2 Figure 3rM Figure 5 (A) to 5th picture (B), /7C

Claims (1)

[Claims] The upper edge blade works in cooperation with the die to perform additional cutting on the plate material.
A punch that is continuously provided with a middle blade and a lower end blade of different heights is moved up and down in conjunction with the operation of a hydraulic cylinder in a hydraulic press, and the lower end blade and intermediate blade of the punch shear the plate material. The hydraulic cylinder is repeatedly controlled to a predetermined stroke to perform additional cutting on the plate, and then the stroke of the hydraulic cylinder is controlled to a stroke in which the upper edge of the punch cuts the plate so that the upper edge of the punch cuts the plate. A further cutting process using a hydraulic press, characterized in that additional cutting is performed by performing additional cutting.