JP3107019B2 - Punch press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch press having a strip error detecting function.

[0002]

2. Description of the Related Art In a punch press, after a punch is lowered and a hole is formed,
A stripper made of a spring member or the like is generally provided so that the punch can be easily removed from the punch hole of the plate material. But,
If the elasticity of the stripper decreases, or if there is a problem during punching, the punch will not be able to come out of the punched hole in the plate.
Strip errors may occur. In particular, in the case of a type in which the ram merely hits the punch and the punch is lifted and returned only by the spring, a strip mistake is likely to occur in the punch holder, not the forced pulling method in which the ram lifts the punch. . If a strip mistake occurs, the operation of moving the plate for the next processing cannot be performed. If the plate is forcibly moved, the plate feeding means, the punch, and the like may be damaged.

An object of the present invention is to provide a punch press capable of accurately detecting occurrence of a strip error. Another object of the present invention is to enable strip error detection with a simple configuration and high accuracy.

[0004]

SUMMARY OF THE INVENTION A punch press according to the present invention is a punch press for making a hole in a sheet material by using a punch and a die, wherein the sheet material height measuring means for measuring the height of the sheet material; A punch position detecting means for detecting an ascending / descending position, and when the plate material height actually measured by the plate material height measuring means is equal to or more than a predetermined height when the punch is at a predetermined elevating position from the detection result of this means. And a strip error determining means for determining a strip error. According to this configuration, in the process of repeating the punch operation,
When the punch moves down to make a hole in the plate, and when the punch moves up to the predetermined elevating position, the plate height measuring means measures the height of the plate, and the measurement result is compared with the predetermined height by the strip mistake determining means. Is done. When the plate material height is lower than the predetermined height, it is determined that the strip is normal, and when the plate material height is equal to or more than the predetermined height, it is determined that the strip is incorrect. Therefore, when the plate material is lifted up due to a strip error while the punch is still fitted in the punch hole, the strip error determining means determines that the strip error has occurred. Based on the result of the determination, the subsequent operation is stopped or the like, so that mechanical damage or the like due to a strip mistake can be prevented.

In the above construction, it is preferable that the plate height measuring means detects the height of a portion of the plate near the punch position. When the plate material is lifted up by the punch due to a strip mistake, the plate material remains on the table in a portion far from the punch, causing bending.
Therefore, the strip error can be reliably detected by actually measuring the plate material height near the punch position. Also,
When the height of the plate material is increased due to other factors such as a warpage of the plate material and other factors of the strip error, it is prevented that a strip error is erroneously detected. Further, in these configurations, the plate material height measuring means includes a detection hole provided in the vicinity of a punch holding position of a punch holding body for holding the punch so as to be able to move up and down, and a distance between the plate material through the detection hole. It may be composed of a length measuring means for measuring by contact. The punch holder is a turret in a turret punch press,
A cartridge for holding a punch in a cartridge-type punch press. As the length measuring means, a laser length measuring device or the like can be used. By providing a detection hole in the punch holder and measuring the length by the length measuring means in this manner, the height of a portion of the plate material in the vicinity of the punch position can be accurately measured.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. This embodiment is applied to a turret punch press. As shown in FIG. 2, this punch press has a frame 6 including a die holding unit 3 for holding the punch 1 and the die 2, a plate material feeding mechanism 4, and a punch driving mechanism 5. The mold holding unit 3
Each of the turrets 7 and 8 serves as a punch holder and a die holder, and turret rotating means (not shown) for indexing and rotating the turrets 7 and 8 in synchronization. The turrets 7 and 8 each hold a plurality of punches 1 and dies 2 arranged in the circumferential direction.

The plate feeding mechanism 4 grips the plate W on the work table 9 with the work holder 10 and moves the carriage 11 back and forth, and moves the cross slide 12 mounted on the carriage 11 to which the work holder 10 is attached to the right and left. Thus, the plate material W is moved on the work table 9 in the front-back direction (Y direction) and the left-right direction (X direction). The carriage 9 and the cross slide 10 are driven forward and backward by a servomotor and a feed screw mechanism (not shown), respectively. The punch driving mechanism 5 has a predetermined punch position P
The ram 13 is set up and down by a punch drive source 14 so as to be moved up and down. The punch driving mechanism 5 may be a mechanical type using a normal motor and a flywheel or a hydraulic type. In this example, a servo motor is used as the punch driving source 14. ing. The rotation output of the punch drive source 14 (FIG. 2) is converted into the elevation of the ram 13 via a rotation / linear motion conversion mechanism 15 including an eccentric cam mechanism and the like.

As shown in FIG. 1, the punch 1 has a punch body 16 and a stripper 17, and is installed in a punch holding hole 18 of the turret 7 so as to be able to move up and down. The stripper return spring 19 and the punch return spring 20 Is maintained in the ascending return state. In this example, the stripper 17 is formed in a cylindrical shape which is fitted to the outer periphery of the punch body 16 so as to be able to move up and down, and also serves as a punch holder.
Is fitted to the punch holding hole 18 by a stripper 17 so as to be able to move up and down. The lower end of the stripper return spring 19 is engaged with the turret 7 to support the flange at the upper end of the stripper 17.
The lower end of the punch return spring 20 engages with the flange at the upper end of the stripper 17 to support the head of the punch body 16.
The die 2 is supported on the lower turret 8 via a die holder 21. On the upper surface of the lower turret 8, a turret part work table 22 on which the plate material W is placed is provided at the same upper surface level as the work table 9 in FIG.

In this embodiment, in a punch press having such a basic configuration, a plate material height measuring means 25, a punch position detecting means 26, and a strip error judging means 27 are provided. The plate material height measuring means 25 includes a detection hole 29 vertically penetrated in the vicinity of each punch holding hole 18 of the turret 7, and a plate material W through the detection hole 29.
And a length measuring means 30 for measuring the distance of the object without contact. A laser length measuring device is used as the length measuring means 30, and the ram 1 is used.
3 is installed on the frame 6. Detection hole 29
3, in this example, as shown in FIG. 3, the turret 7 is provided on the outer diameter side of the punch holding hole 18. The punch position detecting means 26 is a means for detecting the stroke position of the ram 13, and may be a means for directly detecting the stroke position of the ram 13. Ram 1 in the drive transmission path
The third stroke position may be detected.

When the punch 1 is at the predetermined elevating position E based on the detection result of the punch position detecting means 26, the strip error judging means 27 determines that the plate material height h actually measured by the plate material height measuring means 25 is equal to or greater than the predetermined height. This is means for determining a strip error when h0. The strip error determination means 27 may be provided as a part of the control device 28 for controlling the entire punch press, or may be provided independently. The predetermined vertical position E of the punch 1 when the strip mistake determining means 27 makes the determination is determined by the relationship between the punch position and time in FIG.
Is a position E in the range from the punching of the plate material W to the bottom dead center, the transition to the ascending operation, exceeding the plate surface height position H, and reaching the top dead center or a predetermined upper standby height. The plate material surface height position H is, for example, a height corresponding to the plate thickness with reference to a plate material placement height position such as a die height. The predetermined height h0 is a height at which the upper surface of the plate material W does not reach when no strip error has occurred, and is a height from a predetermined reference position, for example, a die height DH.

The result of the judgment by the strip error judging means 27 is sent to a control device 28 for controlling the whole punch press, and is used for a predetermined control, for example, a control for stopping the machine, and to a notifying means (not shown). Sent.

The operation of the above configuration will be described. Punch 1
Normally, it is at the ascending standby position shown in FIG. Ram 13
When the punch body 16 of the punch 1 is pressed down, the stripper 17 moves down against the stripper return spring 19 together with the punch body 16 and presses the upper surface of the plate material W. Ram 1
When the punch body 3 further descends, the punch body 16 moves against the punch return spring 29 so that the tip serving as a shearing blade becomes a stripper 17.
And the sheet material W is punched. When the ram 13 reaches the bottom dead center and starts to rise, the punch body 16 also rises, and the plate material W
When the punch body 16 rises until the punch body 16 comes out of the punch hole, both the punch body 16 and the stripper 17 rise,
It returns to its original ascent state.

In the process of repeating such a punching operation,
As shown in FIG. 4, the strip mistake determination means 27
While the punch 1 is at the predetermined elevating position E when returning from the ascent, the plate height h, which is the measurement value of the length measuring means 30, is monitored. At this time, if the punch 1 is normally removed from the punch hole,
The plate height h does not exceed the predetermined height h0, the strip error determination means 27 does not output a strip error determination signal, and the next operation of the punch press is continued. When a strip mistake occurs, the plate material W is lifted by the punch 1 fitted in the punch hole as shown in FIG. Therefore, the plate material height h, which is a measured value of the length measuring means 30, exceeds the predetermined height h0, and the strip mistake determination means 27 outputs a strip mistake determination signal. Based on this determination signal, the control device 28 performs predetermined control such as operation stop, and the notifying means notifies the operator of sound, light, or on the screen of the screen display device. As a result, mechanical damage or the like due to a strip mistake is prevented. Further, since the plate material height measuring means 25 of this embodiment is provided with the detection hole 29 in the upper turret 7 and the length measuring means 30 above the detection hole 29, it adheres to the oil or the plate material W used for lubricating the punch 1. The length measuring means 30 is not contaminated with the used oil, and a reliable actual measurement can always be performed.

FIG. 5 shows another embodiment of the present invention. In this example, a transmission type photoelectric sensor including a light projector 31 and a light receiver 32 is used as the plate material height measuring means 25A. The light projector 31 and the light receiver 32 are arranged on both sides of the turret 7 on a horizontal straight line m of a predetermined level passing through the punch position P. The predetermined level is set within a predetermined range slightly above the die height DH and slightly below the upper turret 7. In this configuration, when a strip mistake occurs, the light beam is blocked by the plate material W, and the output of the light receiver 32 is turned off. The strip error determining means 27 recognizes from the OFF signal of the light receiver 32 that the plate material height is equal to or higher than a predetermined height, and determines a strip error. Other configurations and effects are the same as those in the example of FIG.

FIG. 6 is a partially broken side view showing still another embodiment of the present invention. In this example, the plate material height measuring means 25B is provided on the table 31 near the punch position P. The plate material height measuring means 25B is composed of length measuring means such as a laser length measuring device for measuring the height position of the back surface of the plate material W, and is provided in a state of being embedded in a hole provided in the table 31. The table 31 may be installed on the frame 6 like the table 9 in the embodiment of FIG.
Further, a turret work table attached to the turret 2 or the die holder 21 may be used. In the case of this configuration, since the length from the length measuring means serving as the sheet material height measuring means 25B to the position of the sheet material W in a normal state is short, the state of the strip error of the sheet material W is indicated by a chain line in FIG. As shown by the solid line, the length at the time of strip error is many times longer than the length at the time of normal. Therefore, the reliability of the determination of the strip mistake is high, and it can be used even if the plate material height measuring means 25B has low accuracy. Other configurations,
The effect is the same as the embodiment of FIG.

[0016]

According to the punch press of the present invention, there is provided a plate material height measuring means for measuring the height of a plate material, a punch position detecting means for detecting an ascending and descending position of the punch; When it is at the elevating position, when the plate material height actually measured by the plate material height measuring device is equal to or more than a predetermined height, there is provided a strip error determining device that determines that a strip error has occurred. The occurrence can be accurately detected. If the plate material height measuring means detects the height of a portion of the plate material in the vicinity of the punch position, erroneous detection of a stop mistake is eliminated, and the reliability of the determination of the stop mistake is improved. In addition, the plate material height measuring means measures the distance between the plate material and the detection hole provided in the vicinity of the punch holding position of the punch holder for holding the punch so as to be able to move up and down without contact. In the case of using the long means, further improvement of the accuracy and reliability of the determination of the strip error can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram combining an operation explanatory diagram of a punch press and a block diagram of a control system according to an embodiment of the present invention.

FIG. 2 is a side view of the punch press.

FIG. 3 is a partial plan view of the turret.

FIG. 4 is an explanatory diagram showing a relationship between a speed curve of a punch and a predetermined lifting position of the punch.

FIG. 5 is a partial plan view showing a relationship between a turret and a plate height measuring means according to another embodiment of the present invention.

FIG. 6 is a cutaway side view of a plate material height measuring means and a peripheral portion thereof according to still another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Punch 20 ... Punch return spring 2 ... Die 25 ... Plate material height measuring means 7 ... Turret (punch holder) 25A, 25A ... Plate material height measuring means 8 ... Turret 26 ... Punch position detecting means 16 ... Punch body 27 ... Strip mistake determination means 17 Stripper 29 Detection hole 18 Punch holding hole 30 Length measuring means 19 Stripper return spring P Punch position

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 28/00 B21D 28/26 B21D 45/08

Claims (3)

(57) [Claims] 1. A punch press for punching a plate material by a punch and a die, comprising: a plate material height measuring means for measuring a height of the plate material; and a punch position detecting means for detecting an elevation position of the punch. When the punch is at a predetermined elevating position from a detection result of this means, when the plate material height actually measured by the plate material height measuring means is equal to or more than a predetermined height, a strip mistake judging means for judging a strip mistake is provided; Punch press equipped with. 2. The punch press according to claim 1, wherein the plate material height measuring means detects the height of a portion of the plate material near the punch position. 3. The sheet material height measuring means includes: a detection hole provided in the vicinity of a punch holding position of a punch holding body for holding a punch so as to be able to move up and down; 3. The punch press according to claim 2, comprising length measuring means for measuring.