JPH04143027A - Interference prevention device for work holder - Google Patents

Abstract

PURPOSE:To safely perform judgement of interference by automatically recognizing the mounting position of a work holder, operating the moving position of the work holder based on this mounting position and judging whether it interferes with the prohibiting area or not. CONSTITUTION:Before working, the work holder 13 is traversed by moving a cross slide 12. In this traversing time, the detected value of a feed position detector 32 when the work holder 13 passes a pass detector 31 is taken into a work holder position recognizing means 38 and the mounting position of the work holder 13 to the cross slide 12 is recognized automatically from this detected value. In a working time, since a work is fed in accordance with a working program 39, the mobile position of the work holder 13 is operated based on the position of the work holder recognized by a program checking means 42 to judge the interference of the mobile position with a prescribed prohibiting area T, R.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a work holder interference prevention device that prevents interference between a work holder and a tool in a plate processing machine such as a punch press or a shearing machine. It is.

[Conventional technology]

Conventionally, this type of plate material processing machine has a carriage 51 that moves in the Y-axis direction in order to feed the plate material Wa in the X and Y directions on a work table (not shown), as shown in FIG.
A cross slide 52 that moves on this carry run 51 in the X-axis direction i is provided, and a plurality of work holders 53 for gripping the plate material Wa are attached to the cross slide 52.

These work holders 53 are supported on the cross slide 52 via mounting rails (not shown) so that the mounting position can be changed depending on the size of the plate material Wa to be handled, etc., and they can be tightened at any position and fixed with a tool. That's what I do.

In such a feeding device, if the work holder 53 is inserted into the tool position Q of a puncher or the like to perform a machining operation, the work holder 53 will be punched out and damaged. Therefore, a dog 54 is provided on each work holder 53, and the tool position Q
A proximity switch (not shown) corresponding to the dog 5
4 is detected, the punching operation etc. are prohibited to ensure safety.

The dog 54 is formed wider than the work holder 53 in order to improve safety by expanding the safety area in which machining operations are prohibited, and the safety area can be divided into multiple stages depending on the size of the tool, etc. It is formed into a step-like planar shape as shown in the figure so that it can be selected.

[Invention or problem to be solved]

However, with such a wide dog 54, it is impossible to bring the work holders 53 close to each other.Therefore, there is a problem that it is impossible to grip a small-sized plate material Wa.

If the width of the dog 54 is narrowed, the work holders 53 can be brought closer to each other, but in this case, even a slight error may cause an error in judgment of interference, which may cause interference, reducing safety.

SUMMARY OF THE INVENTION An object of the present invention is to provide a work holder interference prevention device that can safely detect interference even when a plurality of work holders are placed close to each other, and that can expand the dimensional range of workpieces that can be machined.

[Means to solve the problem]

The structure of this invention will be explained with reference to FIG. 1 corresponding to an embodiment.

This work holder interference prevention device is a work holder (1
3) is provided with a work holder position recognition means (38) that automatically recognizes the mounting position, and based on the recognized position, calculates the movement position to which the work holder (13) is sent vertically and horizontally according to the machining program (39), A program check means (42) is provided for determining interference between the moving position and the predetermined prohibited areas (T) and (R).

The work holder (13) is attached to the cross slide l'(+2) so that its attachment position can be changed. The cotton holder position recognition means (38) is a cross slide (12)
The work holder position is recognized from the detection value by the feed position detector (32) of the cross slide (12) at the detection timing of the passage detector (31) that detects the passage of the work holder (13) when the cross slide (12) is moved sideways. It is something.

[For production]

Before machining, cross slide the work boulder (13) (
12). During this traverse, the detected value of the feed position detector (32) when the work holder (I3) passes the passage detector (31) is taken into the work holder position recognition means (38), and from this detected value The attachment position of the work holder (13) to the cross slide (12) is automatically recognized.

During machining, the program check means (42) calculates the location to which the work holder (13) will move in order to feed the work according to the machining program (39) based on the recognized work holder position. Determine interference between the moving position and predetermined prohibited areas (T) and (R).

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 3.

FIG. 2 is a perspective view of a punch press to which this work holder interference prevention device is applied. A 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 (in the Y-axis direction) and left and right (in the X-axis direction) on the work table 2. A C-shaped frame 4 is continuously formed at the rear of the base frame 1, and a punch drive mechanism for driving the ram 5 up and down is provided within the C-shaped frame 4. 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 rails 7. A retractable end locator 9 is provided at the end of the slide table 8 to position the plate material W in the left-right direction. Further, the C-shaped frame 4 is provided with a pressing butt 10 that can be driven up and down to press the plate material W onto the work table 2.

The feeding device 3 has slide tables 8 on both sides and a carriage 11 that is formed on the body and moves back and forth.
1 is equipped with a cross slide j2, which is a traverse table. The carriage l] is driven forward and backward by a feed screw (not shown) provided on the base frame 1.

The cross slide 12 has a plurality of work holders 13 mounted side by side, and is moved forward and backward in the X-axis direction by the drive of a servo motor 16 provided on the carriage 11 via a feed screw 14 and a ball nut 15.

As shown in FIG. 3, the work holder 13 has a fixed lower jaw 24 and a movable upper jaw 26 connected to each other so as to be rotatable in opening and closing around a support shaft 20. Hold it between the two. The movable upper jaw 26 is driven to open and close by an air cylinder 25 mounted at the base end. The work holder 13 is
By engaging the dovetail groove 27 provided on the back surface with the mounting rail 28 on the front surface of the cross slide 1-12, the cross slide 1-12 is supported to be movable left and right, and the tightening device 29
can be fixed at any position. Each work holder 13 is provided with a dog 30 extending rearward.
A passage detector 31 consisting of a proximity switch is provided.

As shown in FIG. 1, the passage detector 31 is provided at the center of the horizontal movement stroke of the cross slide 12. Also,
The cross slide 12 has an origin detection dog 44, and an origin detection switch 45, which is a proximity switch, for detecting this dog 44 is installed on the carriage 11. The servo motor 16 for feeding the cross slide 12 has a built-in feeding position detector 32 consisting of a pulse generator.

The control device 33 consists of an NC device and a programmable controller, and each of the means shown in the figure is provided in a part thereof. The position detection command means 34 is a means for determining a predetermined switch operation or the like and giving a position detection command to the detection value acquisition means 35 and the detection feed command means 37. The detection feeding means 37 is means for moving the cross slide 12 in order to detect the position of the work holder.

The work holder position recognition means 38 is composed of the detected value acquisition means 35 and the work holder position storage means 36.

The detected value capturing means 35 is a means for capturing the position detected value of the feed position detector 32 in response to the ON signal of the passage detector 31, and performs a predetermined calculation on the captured detected value and stores it in the work holder position storage means. Transfer to 36.

The safety zone setting means 41 is a means for automatically setting a safety zone WH for interference determination around each work holder 13, and uses the work holder position stored in the work holder position storage means 36 as a reference position for zone setting. do. The prohibited area setting means 40 is a means for setting a tool prohibited area T and a bat prohibited work JAR. The tool prohibited area T is a predetermined range around a punching tool (not shown) attached to the ram 5 in FIG. 2.

The bat prohibited area R is a predetermined position around the holding bat 10. The sizes of each of these prohibited areas T, R and safety zone WH can be registered as parameters in a predetermined storage area of the control device 33.

The program checking means 42 softens the position of the safety zone WH set in the safety zone setting means 4 according to the feed data of the machining program 39, and determines interference with each of the prohibited areas T and R of the prohibited area setting means 40. It is a means. The stop/warning means 43 is a means for performing a predetermined stop operation and a warning in response to the judgment of the program check means 42 that there is interference.

Next, a position detection operation using the above configuration will be explained. If the mounting position of the work holder 13 of the cross slide 12 is changed, the detection motor switch (
(not shown), then turn on the power.

As a result, the position detection command means 34 outputs a detection command. In response to this detection command, the detection feed command means 37 returns the cross slide 12 to the origin, and after confirming the detection signal of the origin detection switch 45, makes the work holder 12 reciprocate once from the origin position to the right end.

At the time of return of this reciprocating operation, the feed position of the cross slide 12 when the passage detector 31 detects the dog 3o of each work holder j3 and turns on, that is, the detected value of the feed position detector 32, is determined as the detected value. It is captured into the capture means 35 and transferred to the work holder position storage means 36. The coordinate when the passing detector 31 is turned on the first time is the X coordinate of the work holder 13 on the left in the figure, and the coordinate when the pass detector 31 is turned on the second time is the X coordinate of the work holder 13 on the right.
are the coordinates of The same applies when three or more work holders 13 are attached.

In this way, after the mounting position of each work holder 13 with respect to the cross slide 12 is automatically recognized, punching is started. Punching is performed by sequentially positioning each part of the plate material W at the punching position by moving the work holder 13 back and forth and left and right. In this case, the program check means 42 determines whether or not the next location to be positioned interferes with each of the prohibited areas T and R. That is, the coordinates of the safety zone WH of the work holder 13 are moved by the amount of workpiece feed according to the machining program 39, and it is determined whether or not it interferes with the prohibited areas T and R. The determination calculation may be performed immediately before or simultaneously with the feeding of the workpiece, or may be performed by pre-reading the data of the next punching position during the previous punching process. When it is determined that the tool will interfere with the prohibited tool area T,
In response to a command from the stop/warning means 43, the machine is stopped and a warning is issued with a buzzer, lamp, etc. If it interferes with the bat prohibited area R, the lowering of the presser pad 10 is prohibited.

In this way, by checking the program before machining, it is possible to discover in advance whether or not machining is possible. Therefore, it is not necessary to provide a large detection dog 54 (FIG. 4) on the work holder as in the conventional case, and the work holders 13 can be mounted close to each other. Therefore, even a small-sized plate material W can be gripped, and restrictions on workpiece size are relaxed.

In the embodiment described above, the detection value acquisition means 35 is adapted to acquire the feed position of the work holder 13 in one-way movement of the cross slide I. Work holder 1
It is also possible to take in the three feed positions and take the average of both positions. This improves the accuracy of the recognized position of the work holder 13.

Further, in the embodiment described above, the work holder 13 is provided with the dog 30 to detect the passing of the dog 30, but the work holder 13
may be directly detected by the passage detector 31.

〔Effect of the invention〕

The work holder interference prevention device of this invention moves the work holder before machining, automatically recognizes the mounting position of the work holder, and based on this, calculates the movement position of the work holder during machining by checking the program. Since it is determined whether the work holder interferes with the prohibited area or not, it is possible to safely determine interference without providing a large dog on the work holder as in the conventional case. Therefore, the work holders can be arranged close to each other, and even small-sized plates can be gripped, which has the effect of easing restrictions on work size.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of one embodiment of the present invention, FIG. 2 is a perspective view of a punch press to which the interference prevention device is applied, and FIG.
The figure is a sectional view of the work holder, and FIG. 4 is a plan view of the conventional example. 2...Work table, 3...Feeding device, 11...
・Carriage, 12...Cross slide, 13...
Work holder, 14... Feed screw, 16... Servo motor, 3I... Passage detector, 32... Feed position detector, 33... Control device, 35... Detected value capture means , 36...-Work holder position storage means, 37... Detection feed command means, 38...- Work holder position recognition means, 39... Machining program, 40- Prohibited area setting means, 41... Safety zone Setting means, 42... Program check means, 43... Stop/warning means, T.
...Tool prohibited area, W...Plate material, WH...Holder safety zone diagram and diagram

Claims (1)

[Claims] A feed position detector that detects the lateral feed position of the cross slide to which the work holder is attached; a passage detector that detects the passage of the work holder due to the lateral movement of the cross slide; and a detection value of the feed position detector when detecting the passage. A work holder position recognition means that recognizes the work holder mounting position from the work holder, and a program that calculates the position to which the work holder will move according to the machining program based on this recognized position, and determines interference between the movement position and a predetermined prohibited area. A work holder interference prevention device equipped with a checking means.