JPH0390223A - Punching device for sheetlike blank of thin film - Google Patents

Abstract

PURPOSE:To obtain highly accurate punching with little generation of shear droops and burrs, etc., by controlling voltage which is applied to a piezoelectric body according to the signal of a detecting means for punching position. CONSTITUTION:A blank material W is put on a die 12 and is press-set on the die 12 with a pad 16 which receives the energizing force of a spring 15. A punch 11 is vertically moved together with a ram 14 which is lowered after the blank material W is set between the die 12 and the pad 16. In the case that the gap (t) between the bottom surface of the punch 11 and the upper surface of the blank material W is made a prescribed value, the ram 14 is detected with a sensor for detecting the position or in the case that the bottom surface of the punch 11 is brought into contact with the upper surface of the blank material W, it is detected with a detecting means (sensor) for punching position. That signal is inputted to a control means 20 for power source of piezoelectric body and the piezoelectric body 6 is applied with voltage according to that signal. The piezoelectric body 6 is suddenly elongated and the punch 11 is rapidly moved with a stroke (l) toward the die 12 and the punching of the blank material W which is held between the die 12 and the punch 11 is performed at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a punching press processing apparatus, and more particularly to a punch for punching a thin film sheet material using a piezoelectric element as an actuator for driving the punch.

[Conventional technology and problems to be solved by the invention] In conventional punching press processing, various efforts have been made to perform high-quality punching with less occurrence of sagging or burrs on the fractured surface of the plate material after punching. It is being done. In particular, when punching thin sheet materials with a thickness of about 50 to 100 microns, high-speed punching is required to prevent sagging and improve processing accuracy. A single-acting high-speed ram drive is used to achieve this, but in this mechanical press, the mechanisms for moving the ram and obtaining the pressing force for punching are the same, so the processing speed (number of molding cycles) and pressing force are the same. The speed is uniquely defined, and it is not possible to independently select the optimal pressing speed to obtain high quality without causing any stains.

In addition, in a hydraulic press, the number of molding cycles and the pressing speed can be selected separately, but both are mechanically limited to low speeds, and it is particularly difficult to increase the punching speed to perform a punching process with less droop. .

Although high-speed punching is required for punching the thin film sheet-like material, it is sufficient that the punching stroke be short enough to slightly increase the displacement amount from the thickness of the sheet. A laminated piezoelectric actuator is a possible actuator that satisfies this condition. Various examples have been proposed so far of using this laminated piezoelectric material as an actuator to apply a voltage to cause the piezoelectric material to be displaced and to provide displacement to a driven body. In JP-A No. 60-1877, an example of using this for gasoline injectors, diesel engine injectors, etc. is disclosed, and in JP-A-62-209877, it is used for printing printers and Braille characters. An example of its use in a training aircraft has been shown, but there is no example yet of its use in punching thin film sheet materials, which is the subject of this article.

In order to solve the above problems, it is an object of the present invention to provide an appropriate means capable of performing high-speed punching on a thin film sheet-like material.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a punch to which a laminated piezoelectric material in which a plurality of piezoelectric elements are laminated and integrated; The punch position detection means detects the gap between the punch and the thin film sheet-like material placed above, and the piezoelectric body power supply control means controls the voltage applied to the piezoelectric body according to a signal from the detection means. The present invention provides a punching processing device for a thin film sheet-like material having the following characteristics.

[For production]

The punch position is detected when the punch to which the laminated piezoelectric body is attached comes into contact with the thin film sheet material placed on the die, or when the gap between the punch and the material reaches a predetermined value. The detection signal activates the piezoelectric body power control means to apply a voltage to the piezoelectric body, and the piezoelectric body rapidly expands in the axial direction, and the punch is displaced at high speed in the same direction to connect with the die. A punching process is performed on the material sandwiched between the two. After processing, when the voltage application to the piezoelectric body is released, it moves back and forth.
After the punch returns to its original position and discharges the processed material, a new material is introduced between the punch and the die, and the same operation is repeated.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment. (a) is before punching, (
b) shows the state after punching. A laminated piezoelectric body (P2T) 6 is attached to the punch 11 attached to the ram 14 as an actuator of the punch 11, and the piezoelectric body 6 is connected to a piezoelectric body power supply control means 20. Before punching, the material W is conveyed and placed on the die 12, and is pressed and set onto the die 12 by a pad 16 that receives the biasing force of a spring 15. The punch 11 moves up and down together with the ram 14, and after the material W is set between the die 12 and the pad 16, the ram 14 descends and connects the lower end surface of the punch 11 with the material W.
When the gap t with the upper surface reaches a predetermined value, this is detected by a sensor that detects the position, or when the lower end surface of the punch 11 comes into contact with the upper surface of the material W, this is detected by a punch position detection means (sensor). ), and the signal is detected by the piezoelectric power supply controller 1 &
20, a voltage is applied to the piezoelectric body 6 based on this, and the piezoelectric body 6 rapidly expands in the axial direction, and the punch 11 is pushed by this and moves by a stroke l as shown in FIGS. 1(a) and 1(b). moves rapidly in the direction of die 12 as shown by arrow P in
Punching of the material W sandwiched between the punch 2 and the punch 11 is performed at high speed. The displacement amount of the piezoelectric body 6, that is, the punching stroke amount of the puncher 1 is slightly (
α〉large value (1=W+α〉. In this case, Ram 14
The up and down movement of is for initial positioning in order to set the punch 11 at an appropriate position on the material W before processing, and is used to control the punch 11 being punched by the piezoelectric body 6 during the punch 11 punching process. It has nothing to do with stroke. Therefore, the use is not necessarily limited to the ram of an existing press machine, but any material may be used as long as it can position the punch 11 and the material W and has the strength to withstand the pressing force during punching.

In actuality, a means for sequentially conveying and discharging the material under the punch 11 is attached to this to perform continuous work.

Further, the sensor for detecting the gap or contact between the punch 11 and the material W, that is, the punch position detection means is not particularly limited, and the information may be captured by conventional mechanical, electrical, or optical means. , a signal to transmit the timing of applying voltage to the piezoelectric body 6 to the piezoelectric body power supply control device means.

Next, as a second embodiment, an example in which the piezoelectric punch described above is attached to the ram of a press machine will be described. Second
As shown in the figure, 1 is a press body, 2 is a press ram, 3 is a base block, 4 is a ram drive motor, and 5 is a ram drive shaft.The ram drive shaft 5 is driven through a gear mechanism 17 by the rotation of the drive motor 4. At this time, since the pressure receiving nut 7 and the male thread on the outer periphery of the ram drive shaft 5 are screwed together,
The ram drive shaft 5 moves up and down while rotating, and this movement is transmitted to the press ram 2, so that the press ram 2 also moves up and down. A laminated piezoelectric body 6 is attached to the punch 11 as its actuator, and both are attached to the press ram 2 and move up and down in conjunction with this. A die 12 is mounted on the base block 3. The control means includes a drive motor control device 8, a piezoelectric actuation control device 9, and a device 10 for controlling the machining cycle. We are prepared.

Next, the effect of the above configuration will be explained. The position of the press ram 2 is controlled by setting the ram stroke size, which is predetermined from the thickness of the material W and the die-hide of the mold, by a position control detector 13 installed on the sliding part of the ram.

The lower end (tip) surface of the punch 11 is in contact with the upper surface of the material and the motor load current variation (current variation Δ■) due to the load is detected when the bottom edge of the punch 11 is started, or the punch 11 is
Detecting by a position detection means (detection means using a mechanical, electrical, optical sensor, etc.) that detects whether or not the position where the material W approaches the material W has an appropriate gap for starting punching, The signal is processed by the drive motor control device 8 and the piezoelectric body actuation control device 9 so that the piezoelectric body 6 is displaced by the necessary stroke distance d of the punch 11 determined from the thickness of the material W. Then, a voltage determined by the voltage-displacement characteristic is applied to the piezoelectric body 6 to rapidly extend and displace the piezoelectric body 6 to drive the punch, thereby performing high-speed, high-precision punching. After the operation of the piezoelectric body 6 is completed, the press ram 2 returns to the rising end, and one cycle of operation is completed.

The relationship between the above cycle (time) and the strokes of the ram and punch is shown in FIG. In the figure, L is the stroke of the press ram 2 in the motor drive range, and l is the stroke of the punch 11, that is, the stroke of the piezoelectric body 6, in the piezoelectric drive range.

TDC indicates the top dead center of the ram, BDC indicates the bottom dead center of the ram, and S indicates the time width of one stroke (one cycle) of the ram. As can be seen from the figure, the punching process using the piezoelectric body 6 is performed rapidly in a short period of time.

By using the above-mentioned means, a thin film sheet material with a thickness of about 50 to 100 microns, which could not be precisely punched using conventional methods, can be punched out using high-speed displacement motion of a piezoelectric material.
It becomes possible to perform punching at a high speed range of mm/min or more, and it is possible to improve the precision of punching and the work efficiency. Furthermore, since the piezoelectric body that serves as the power source in this device is small, the device can be made more compact, thereby reducing equipment investment and making space more efficient.

〔Effect of the invention〕

By implementing the present invention, the following effects can be obtained.

1) By performing high-speed punching using a piezoelectric material, it is possible to punch thin sheet materials with high accuracy and with less occurrence of sag or burrs.

(2) Since the piezoelectric body serving as the power source is small, the device can be made more compact and space efficient.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration and operation of the punching device according to the first embodiment, in which (a) shows the state before punching, (b) shows the state after punching, and FIG. 2 shows the operation in conjunction with the press machine according to the second embodiment. FIG. 3 shows a time-stroke diagram of punching by the device shown in FIG. 2. 6... Laminated piezoelectric body, 11... Punch, 12.
... Gui, 20... Piezoelectric power source control means, W... Thin film sheet material.

Claims (1)

[Claims] 1. A punch to which a laminated piezoelectric material made by laminating a plurality of piezoelectric elements is attached, and a punch position detection means for detecting the gap between the punch and a thin film sheet-like material placed on the die; An apparatus for punching a thin film sheet-like material, comprising a piezoelectric power supply control means for controlling a voltage applied to the piezoelectric body in accordance with a signal from the detection means.