JPH073899U - Work holder safety confirmation device for punch press with tap device - Google Patents

Abstract

(57) [Abstract] [Purpose] It shall be possible to confirm with a simple configuration that the work holder does not interfere with the tap device. A punch press has a tap device 18 and a plate pressing device 19 for pressing a plate material W on the table 2 in the vicinity of the tap device 18, and the plate material W is moved by a work holder 13. . In such a punch press, the safety switch 24 for detecting the incomplete lowering of the plate pressing device 19 and the safety determining means 2 for stopping the processing start of the tap device 18 when the incomplete lowering of the safety switch 24 is detected.
8 and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work holder safety confirmation device for a punch press with a tap device, which confirms that the work holder does not interfere with the tap device.

[0002]

[Prior art]

 In the turret punch press, an end portion of a plate material on a table is gripped by a work holder, and the work holder is moved to feed an arbitrary part of the plate material to a punch position. In such a punch press, there is one in which a tap device is attached to a press frame so that holes punched can be tapped on the same table. In such a punch press with a tap device, it is necessary to confirm that the work holder does not enter the interference area with the tap device in order to avoid the work holder from interfering with the tap due to a programming error or the like.

Therefore, conventionally, a dedicated device such as a limit switch or a dog for detecting that the work holder has entered the interference area is provided in the work holder drive system. The interference area is set to be somewhat larger than the actual interference range, taking into consideration operational errors.

[0004]

[Problems to be solved by the device]

 However, if a detection means such as a limit switch or a dog dedicated to such a tap device is provided in the drive system of the work holder, the structure becomes complicated and the cost increases. In addition, the drive system of the work holder is often provided with a detection means for detecting that the work holder has entered the punch position or another predetermined position, but for the convenience of installing such various detection means, tapping is performed. In some cases, it may be difficult to obtain a space for providing an entrance detection means for the device. In addition, the tap device may be exchangeable to various sizes, but when the tap device is exchanged, the interference area also differs, and thus the readjustment of the mounting position of the dog or the like is required. .

An object of the present invention is to provide a work holder safety confirmation device for a punch press with a tap device, which can confirm with a simple configuration that the work holder does not interfere with the tap device.

[0006]

[Means for Solving the Problems]

 The configuration of the present invention will be described with reference to FIG. 1 corresponding to the embodiment. The punch press has a tap device (18) and a plate pressing device (19) capable of moving up and down to press the plate material (W) on the table (2) near the tap device (18). (2) This is a type in which the upper plate material (W) is moved by the work holder (13). In such a punch press, the safety switch (S2) that detects incomplete lowering of the plate pressing device (19) and the tapping device (18) start processing when the incomplete lowering of the safety switch (S2) is detected. A safety judging means (28) for stopping is provided.

[0007]

[Action]

 When performing tap processing, first, the plate material (W) on the table (2) is pressed by the plate pressing device (19), and then the tap (18a) is lowered to perform tap processing. When the processing is completed, the tap (18a) is pulled backward while rotating in the reverse direction. The plate pressing device (19) prevents the plate material (W9) from rising during this extraction. When the plate retainer (19) presses the plate material (W) through such a series of tapping operations, if the work holder (13) is bitten under the plate retainer (1), the plate retainer is pressed. (19) does not descend to the predetermined presser height, and the safety switch (S2) detects incomplete lowering. The start of tapping is stopped by this detection. Therefore, interference between the work holder (13) and the tap (18a) is prevented in advance. When the plate pressing device (19) normally presses the plate material (W), the safety switch (S2) does not generate an incomplete lowering detection signal, and tapping is started.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a perspective view of the punch press. The base frame 1 is provided with a work table 2 on which a plate material W is placed, and a feeding device 3 for moving the plate material W back and forth (Y axis direction) and left and right (X axis direction) on the table 2. A C-shaped frame 4 is continuously provided at the rear part of the base frame 1, upper and lower turrets 10 are installed at the throat thereof, and a punch drive mechanism 9 for driving the ram 5 is provided in the upper frame part. ing.

The work table 2 is composed of a central fixed table 6 fixed to the base frame 1, and slide tables 8 on both sides that move back and forth on a rail 7. The feeding device 3 has a carriage 11 which is integrally formed with the slide tables 8 on both sides and moves back and forth, and a cross slide 12 is mounted on a carriage 11 so as to be movable left and right. The cross slide 12 is driven by a motor 16 and a feed screw 14 provided on the carriage 11, and the carriage 11 is driven by a motor and a feed screw (not shown) provided on the base frame 1. A plurality of work holders 13 for holding the end portions of the plate material W on the table 2 are attached to the cross slide 12. A large number of free bearings 17 (FIG. 1) are provided on the upper surface of the table 2.

In the punch press having such a structure, the tap device 18 and the plate pressing device 19 are installed at the front end side edge of the upper frame portion of the C-shaped frame 4. As shown in FIG. 1, the tap device 18 and the plate pressing device 19 are configured as a single tap device unit 20 together with a common mounting frame 21, and are mounted on the C-shaped frame 4. The tap device 18 has a rotary lifting drive device 22 that lifts the tap 18a while rotating it.

The plate retainer 19 is provided with a retainer plate 23 on the piston rod 24a of the air cylinder 24, and the retainer plate 23 is formed in a U shape surrounding the periphery of the tap 18a as shown in FIG. Has been done. The air cylinder 23 is a double-acting type, and a pressure switch PS is provided in the pneumatic path 25 of the cylinder chamber above it. Further, the air cylinder 23 is equipped with a proximity switch S1 for detecting the rising stroke end, and is also provided with a safety switch S2 for detecting that the air cylinder 23 is slightly raised from the machining stroke end. The safety switch S2 is a proximity switch, and the switches S1 and S2 detect the piston rod 24a and are turned on.

The control system will be described. The NC / PC device 27 is a control device including a numerical control device for controlling the entire punch press and a programmable controller, and a safety determining means 28 is configured as a part thereof. The safety judging means 28 is means for judging the safety against the interference between the tap device 18 and the work holder 13 and outputting an operation command, and FIG. That is, the safety determination means 28 determines “good” when the safety switch S2 is off and the pressure switch PS is on, and determines “bad” when both the safety switch S2 and the pressure switch PS are on. . Further, the safety judging means 28 stops the entire operation of the punch press when it is judged as "defective", and also causes the notification device 29 such as a lamp, a buzzer, a CRT, etc. to perform the notification operation, and when it is judged as "good" Allow normal operation to continue. The safety judgment means 28 may be set by a predetermined control program, or may be composed of a simple logic circuit.

Next, the operation of the above-described structure during tap processing will be described. FIG. 4 shows an example of normal operation. The plate pressing device 19 stands by in a raised state of the pressing plate 23 as shown in FIG. In tapping, first, as shown in FIG. 2B, the plate W on the table 2 is pressed by the pressing plate 23 by the downward drive of the air cylinder 24, and then the tap 18a of the tap device 18 is shown by a solid line. Perform tapping by descending from the standby position shown to the descent end shown by the chain line. When the processing is completed, the tap 18a is pulled backward while rotating in the reverse direction. The pressing plate 23 prevents the plate material W from rising due to the pulling resistance at this time. After this, the air cylinder 24 rises and returns to the standby position as shown in FIG.

In this series of tapping operations, in the standby state of FIG. 4A, the safety switch S2 is on, but the pressure switch PS (FIG. 1) indicating the back pressure of the upper cylinder chamber is off. Therefore, the safety determination unit 28 is in the “good” determination state. In the pressing state of FIG. 4 (B), the pressure switch PS is turned on, but the safety switch S2 is turned off, so the safety determination means 28 is in the “good” determination state. Therefore, the normal tapping operation is continued.

As shown in FIG. 5 (B), when the plate material W is caught by the pressing plate 23 when the plate pressing device 24 descends, the safety switch S2 is turned on and the pressure switch PS is also turned on. Therefore, as can be seen from FIG. 3, the safety judging means 28 judges "defective". By this defect determination signal, the notifying means 29 operates to call an operator, and at the same time, the entire punch press is stopped, so that the start of the next tapping process is stopped.

Since this work holder safety confirmation device detects the interference between the tap 18a and the work holder 13 by utilizing the structure of the plate pressing device 19 as described above, the drive system of the work holder 13 is provided with a dedicated interference. Since it is not necessary to provide a detection switch or the like, the configuration can be simplified and the cost can be reduced. Further, since the holding plate 23 is provided large enough to surround the tap 18a and the range of the holding plate 23 is determined as the interference area, the interference between the tap 18a and the work holder 13 can be reliably avoided.

Further, instead of taking a zone on the NC axis in advance and detecting the zone by turning on / off the sensor on the drive shaft, the sheet material W is directly checked to determine whether tapping is possible. It is possible to directly see the abnormality of W and the presence or absence of clamp (work holder), and it is possible to easily perform the function without forming a complicated sequence for control.

Although the safety switch S2 is added to the air cylinder 24 in the above-described embodiment, a downward stroke end detection switch (not shown) provided as standard in the air cylinder 24 can be used as a safety switch. .

[0019]

[Effect of device]

 Since the work holder safety confirmation device of this invention detects the entry of the work holder into the interference area with respect to the tap using the structure of the plate pressing device, a dedicated interference detection switch etc. is provided in the work holder drive system. There is no need to provide it, the configuration can be simplified, and the cost can be reduced.

[Brief description of drawings]

FIG. 1A is an explanatory view in which a partially broken side surface and a block diagram showing an embodiment of the present invention are combined, and FIG. 1B is a plan view of a holding plate thereof.

FIG. 2 is a perspective view of an entire punch press.

FIG. 3 is a chart showing an operation of a safety judgment means.

FIG. 4 is an explanatory diagram of a normal tapping operation.

FIG. 5 is an explanatory diagram showing a presser foot abnormality.

[Explanation of symbols]

2 ... Work table, 3 ... Feed device, 9 ... Punch drive mechanism, 10 ... Turret 11 ... Carriage, 12 ... Cross slide, 13 ... Work holder, 18 ... Tap device, 18a ... Tap, 19 ...
Plate pressing device, 23 ... Pressing plate, 24 ... Air cylinder, 28
... safety judgment means, 29 ... alarm device, PS ... pressure switch, S2 ... safety switch, W ... plate material

Claims (1)

[Scope of utility model registration request] 1. A punch press, comprising: a tap device and a plate pressing device capable of lifting and lowering a plate material on a table near the tap device, wherein the plate material on the table is moved by a work holder. A work holder safety confirmation device for a punch press with a tap device, which is provided with a safety switch for detecting an incomplete lowering of the device and a safety determination means for stopping the processing start of the tap device when the lowering of the safety switch is detected.