JPH0794052B2 - Back gauge abutment positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention uses a back gauge, such as a bending machine, to position the tip of a workpiece by abutting it against the abutting member of the back gauge. The present invention relates to a processing machine that performs bending and other sheet metal workings, and relates to a device that positions the abutting member of the back gauge.

(Prior Art) In a processing machine such as a bending machine, for example, a back gauge is provided in the back of a space between an upper punch and a lower die, and a work piece is attached to a tip end surface of an abutting member of the back gauge. The front and rear edges are abutted and positioned, and the work is bent between the punch and die. The bending work position of the work is adjusted by adjusting the abutting distance to the back gauge. In the back gauge of such a processing machine, care must be taken so that the abutting member does not collide with the die during the position adjustment.

However, heretofore, there has not been seen a device that automatically determines the movement of the abutting member by determining whether or not there is a collision with the moving die of the abutting member of the back gauge before processing.

(Problems to be Solved by the Invention) As described above, in the conventional abutting and positioning device for the back gauge, it is necessary for the operator to carefully control the movement of the abutting member so as to avoid collision with the die. The advent of an automatic abutment positioning device was desired.

The present invention has been made in view of such a conventional problem, and automatically abuts the abutting member with a die at a desired position only by giving a position command of a back gauge for the next processing. An object of the present invention is to provide a back gauge abutting and positioning device that can be positioned without the need.

[Structure of the Invention] (Means for Solving the Problems) The back gauge abutment positioning device of the present invention is a back gauge front-back direction and up-down direction positioning means,
The front and rear position detecting means of the back gauge abutting member and the position detecting means for detecting the vertical position are compared with the current position of the back gauge abutting member and the abutting position for the next processing, and the vertical position A means for determining whether the change passes up and down the horizontal processing surface on the die, and the change in the front-back position passes back and forth through the back gauge side edge of the die.
When it is determined that the abutting member vertically passes through the horizontal machining surface of the die and forwards and backwards through the back gauge side edge of the die by this determination means, the abutting member is attached to the die in the next machining. When approaching the die, the vertical driving means of the back gauge is driven so that the lower surface of the abutting member is located above the edge of the die before reaching the edge of the die. When it retreats from the position on the upper side of the die to the back gauge side, it has a control means for stopping the operation of the vertical driving means of the abutting member until it passes through the edge of the die. .

(Operation) In the back gauge abutment positioning device of the present invention,
Compare the current position of the back gauge abutting member and the position to move for the next machining, and when moving the abutting member to the next abutting position, the abutting member will move the horizontal machining surface on the die. It is determined whether it passes up and down and the back gauge side edge of the die forward and backward, and the abutting member passes vertically over the horizontal machining surface of the die and forward and backward through the back gauge side edge of the die. In such a case, when the abutting member is made to approach the die from the rear for the position adjustment, the lower surface of the abutting member is located above the edge of the die until the edge of the die on the back gauge side is reached. Drive the vertical drive means of the back gauge so that it also comes to the upper position, and conversely when the abutting member retracts from the position above the die to the back gauge side, the edge of the back gauge side of the die Until pass is not performed the vertical position adjustment of the abutment member, automatically avoiding collisions abutment member to the die.

(Embodiment) A bending machine 1 shown in FIG. 1 is a processing machine to which an embodiment of the present invention is applied, and has an upper apron 3 and a lower apron 5. Below the upper apron 3 is a punch 7,
A die 9 is fixed above the lower apron 5 by a plurality of bolts 11 via mold holding members 13, 13. With the bolts loosened, the upper apron 3 or the lower apron 5 is inserted, for example, from the right direction, and the bolts 11 and 11 are fixed at appropriate positions by tightening with a tool such as a spanner or a wrench. A front cover 17 having a tool base 15 extending in the left-right direction is provided on the front surface of the lower apron 5.

The movable operation panel 19 and the movable foot petal device 21 are used for raising / lowering the lower apron 5 and for controlling the position of a back gauge described later.

A back gauge 25 is provided in the work processing space 23 between the upper apron 3 and the lower apron 5 of the bending machine 1 as shown in detail in FIG. The back gauge 25 includes a plurality of supports 27 protruding rearward near the left and right ends of the lower apron 5. And on the support 27,
A lead screw 31 driven by an electric motor 29 and a linear motion guide 33 parallel to the lead screw 31 are provided.

Lead screw 31 and linear motion guide 33 above
A movable table 35 is provided on the upper part of the table. This left and right movable stand 3
A beam 37 extends horizontally between the five and thirty-five, and the height can be adjusted by an elevating and lowering drive device 39 as vertical drive means.

The back gauge 25 is attached to the beam 37 so that it can be positioned left and right. An abutting member 41 is provided on the front surface of the back gauge 25. This abutting member 41
The height is controlled by the lifting / lowering drive device 39 for the beam 37.

In performing bending of a work by the above bending machine 1, first, the work W is bent into the upper apron 3 of the bending machine 1.
Inserted between the punch 7 and the die 9 of the lower apron 5, the front end of the work W is abutting member 41 of the back gauge 25.
Butt against the end face of. Subsequently, the lower apron 5 is driven by setting the upper apron 3 to bend between the punch 7 and the die 9. It should be noted that these series of operations are automatically performed by the NC device provided in the bending machine 1.

An embodiment of such a back gauge butting and positioning device for the bending machine 1 will be described below.

As shown in FIG. 3, the back gauge 25 is provided with vertical Z-axis driving means 43 and longitudinal L-axis driving means 45. These vertical driving means 43 are shown in FIG. The vertical drive means 45 corresponds to the lifting drive device 39 of the back gauge 15, and the front-back direction drive means 45 corresponds to the support body 27. Therefore, the back gauge 25 is driven in the Z-axis direction together with the abutting member 41 by the driving of the vertical driving means 43, and is driven in the front-back L-axis direction which advances and retracts with respect to the punch 7 and the die 9 by the front-back driving means 45. It

In order to detect the positions of the back gauge 25 and its abutting member 41, an up / down position detecting means 47 and a front / rear position detecting means 49 are provided.

The vertical position detection signal of the vertical position detecting means 47 and the front and rear position detecting signal of the front and rear position detecting means 49 are given to the judging means 51.

The judgment unit 51 is given a command signal of an abutting position for the next bending process from the NC device of the bending machine 1.
Therefore, the vertical position detecting means 47, the front and rear position detecting means 49
The back gauge 45 and its abutting member 41 are compared by comparing the present position with the abutting command position for the next machining.
Calculates how much to move in the vertical Z-axis and in the front-back L-axis. Further, the determination means 51 passes vertically through the machining horizontal plane P on the upper surface of the die 9 when the abutment member 41 is moved to the abutment position for the next machining, and the edge of the die 9 on the back gauge side. Determine if you will pass Q back and forth.

The judgment signal from the judgment means 51 is given to the control means 53. The control means 53 can individually drive and control the up-down direction driving means 43 and the front-rear direction driving means 45, and the abutting member 41 against the die 9 by the calculation described later.
The drive means 43, 45 are controlled so as to prevent the collision of the workpieces with each other and move them to the abutting position for the next processing.

The operation of the back gauge abutment positioning device having the above-described configuration will be described below. As shown in FIG. 4, the current butting position R1 of the butting member 41 of the back gauge 25 is set as the present butting position R2 for the next processing. Horizontal distance in the front-rear direction from the machining center line C at the current butting position R1
L1 is the horizontal distance L2 of the next butting position R2. Also, the vertical position Z1 of the current butting position R1, the next butting position
The vertical position Z2 of R2. Further, the horizontal distance a from the processing center line C of the die 9 to the back gauge side edge Q is set.

In the case of the positional relationship shown in FIG. 4, when moving from the current abutting position R1 to the next abutting position R2, the abutting member 41 vertically passes over the horizontal machining surface P on the upper surface of the die 9 and Pass the gauge-side edge Q back and forth. Therefore,
If the vertical position of the abutting member 41 has not risen by Z1 from the current position R1 to the position of the end edge Q, it will collide with the die 9 during the movement.

In order to avoid this situation, the back gauge abutment positioning is executed based on the flowchart shown in FIG. More specifically, first, if the front-rear position L2 of the abutting position R2 is larger than the distance a to the edge Q of the die 9, the abutting member 41 does not pass the edge Q of the die 9 in the front-back direction. There is no risk of collision with the die, and it can be moved to the next butting position as specified by the NC position. However, if the front-back position L2 of the next butting position R2 is smaller than the distance a of the edge Q of the die 9, the butting member 41 passes the edge Q of the die 9 back and forth, and a collision occurs. There is a possibility of This is judged in step 101.

Subsequently, in step 103, it is determined whether or not the abutting member 41 passes up and down the horizontal machining surface P of the die 9 before reaching the abutting position R2 next time. Here, the current position R1 is higher than the horizontal machining surface P, and the next butting position
If R2 is also higher than the horizontal machining plane P, the abutting member 41 does not collide with the die 9 with respect to the next abutting position. However, if the current abutting position R1 is lower than the horizontal abutting surface P, the abutting member 41 vertically passes the horizontal abutting surface P during the movement from the current abutting position R1 to the next abutting position R2. Therefore, there is a risk of collision with the die 9, and the process proceeds to the next step 105.

In step 105, if the vertical position Z2 of the next butting position R2 is set lower than the horizontal machining surface P, it is determined that the position is inappropriate and an alarm message is given. (Step 107) However, if it is determined that the abutting member 41 passes through the horizontal machining surface P from the bottom to the top from the current position R1 to the next position R2 in step 105, the vertical position drive control and the front-back position drive control are performed. To step 109 for.

In step 109, the abutting member 41 moves from the current position R1 to the back gauge of the die 9 in consideration of the driving speed of the back gauge 25 by the vertical driving means 43 and the front and rear driving speed of the front and rear driving means 45. The vertical movement time t1 and the horizontal movement time t2 required to reach the side edge Q are calculated.

After that, it is confirmed that the next bending process execution signal is given. (Step 111) Then, first, the vertical driving means 43 drives the abutting member 41 of the back gauge 15 in the vertical direction (t1-t2 + t, where t is a margin).
After that, the abutting member 41 is also driven in the front-rear direction by the front-rear direction driving means 45. (Step 113) By the drive provided with this time lag, the vertical position of the abutting member 41 reaches above the machining horizontal plane P before the tip of the abutting member 41 reaches the end edge Q of the die 9. The collision with the die 9 can be avoided. Even after the driving of the abutting member 41 on the Z-axis side is completed, the driving of the L-axis side in the front-rear direction is continued, and finally the positioning of both axes is completed at the next abutting position R2. (Step 115) In step 101, the current position of the abutting member 41 is outside the edge Q of the die 9, and the front and rear positions of the next abutting position R2 are also outside the edge Q of the die 9. If it is located, it does not pass the edge Q back and forth. Further, from the current position R1 of the abutting member 41 to the next position R2, if it is always above the horizontal machining surface P, the horizontal machining surface P is not passed vertically. Therefore, in these cases, in response to the next bending position signal (step 117), the vertical driving means 43 and the front-back driving means 45 for the abutting member 41 are received.
Are driven at the same time. (Steps 119 and 115) On the contrary, R2 of the abutting member 41 shown by the imaginary line in FIG.
The position is the current position, R1 shown by the solid line is the next abutting position, and when it is necessary to move the abutting member 41 from the upper position of the die 9 to the outer lower position of the die 9, The abutting member 41 may collide with the die 9. Therefore, even in such a case, the position drive control in the up-down direction and the front-back direction is performed based on the flow shown in FIG. 6 in order to avoid the collision.

First, from the current butting position R2 to the next butting position R1
It is determined whether the abutting member 41 passes through the back gauge side edge Q of the die 9 in the front-back direction and passes over the horizontal processing surface P in the up-and-down direction. (Steps 121, 12
3) In steps 121 and 123 above, the die 9 of the abutting member 41
If there is a possibility of collision with, the moving time t2 in the front-rear direction and the moving time t1 in the vertical direction of the abutting member 41 are calculated in step 125. Then, in response to the execution signal of the next bending process (step 127), first the front-rear direction driving means 45 drives the L-axis side, (t2-t1 + t,
Here, after t is a margin), the driving in the Z-axis direction by the vertical driving means 43 is started. (Step 129) When the abutting member 41 reaches the next abutting position R1 from the current abutting position R2, the positioning is completed and the driving is stopped. (Step 131) In Step 121 and Step 123, the current position of the abutting member 41 is already located outside the edge Q of the die 9, and the vertical position Z1 of the abutting member at the next abutting position R1 is set. Is higher than the horizontal machining plane P, it is judged that there is no risk of collision with the die 9 when moving from the current position R2 to the next position R1, and the execution signal for the next process is received ( Step 133), vertical direction Z
The shaft and the L-axis in the front-rear direction are driven simultaneously. (Step 13
5) FIG. 7 shows another embodiment of the back gauge.
The up-and-down driving means of the abutting member 41 with respect to 25 is equipped with an actuator such as an air cylinder, and can be operated in three stages of upper, middle and lower even at the stop position. With respect to such a back gauge 25, as shown in FIG. 8, the abutting setting flag “1”, due to the vertical positional relationship between the abutting member 41 and the machining horizontal plane P of the die 9.
"0" and "-1" are set. The operation flow of the back gauge abutting and positioning device in this case for preventing collision with the die 9 will be described with reference to FIG.

When the abutting setting flag is "1", even if the abutting member 41 is set to any of the upper, middle and lower positions,
The lower surface is located above the horizontal processing surface P of the die 9. Therefore, even if the back gauge side edge Q of the die 9 is passed back and forth between the current butting position R1 and the next butting position R2, a collision between the die 9 and the butting member 41 does not occur. Absent. (Step 201) Also, the distance from the machining center line C of the next butting position R2
If L2 is larger than the width a from the machining center line C of the die 9 to the edge Q, no collision with the die 9 occurs no matter where the height position of the abutting member 41 is set. Therefore, in these cases, the operation of moving the abutting member 41 to any of the upper, middle, and lower positions and the longitudinal L-axis drive are started at the same time, waiting for the next bending execution signal, and the positioning is performed. Be done. (Step 201-Step 2
05) In step 201, the abutment setting flag is not "1", and the distance R2 of the next abutment position R2 is the die 9
If the width is smaller than the width a, the flow from step 207 onward is performed. In step 207, the moving time t1 in the front-rear direction from the current abutting position R1 to the back gauge side edge Q of the die 9 is calculated. The moving time t1 from the lower position to the upper position of the butting member 41, the moving time t2 from the lower position to the middle position, and the moving time t3 from the middle position to the upper position are preset as parameters.

Then, it is judged whether or not the butting setting flag is "-1" (step 209). If not, it is assumed that the butting member 41 has the "0" flag. The position command of the abutting member 41 at the abutting position of is searched. (Step 211) In the step 209, the butting setting flag is set to "-
If it is "1", it is determined whether or not the abutting member 41 is in the upper position at the next abutting position. (Step 213) Here, if the operating position of the abutting member 41 at the abutting position of the next process is not the upper position, this abutting member 41 is moved to the die 9 side in the next process position R2.
When it tries to move up to, it will always collide with the die 9, so a collision alarm is issued. (Step
215) In step 211, if the operating position of the abutting member 41 in the next step is the lower position, it must collide with the die 9 before moving to the abutting position R2 in the next step. Therefore, an alarm is issued at this time as well, and a message indicating that the abutting position is inappropriate is given (step 215). If the operating position of the abutting member in the next step in step 211 is not the down position, twenty one
When the operating position of the abutting member 41 in 3 in the next step is the upper position, the next step 217 is executed. In this step 217, from the vertical movement position at the current butting position R1 of the butting member 41,
The vertical movement time of the abutting member to the vertical movement position at the next abutting position R2 is set. That is,
One of the corresponding travel times T1, T2, T3 is selected from the parameter group shown in step 207, and this is set as the travel time T.

After that, if the execution signal of the bending process of the next process is obtained from the NC device (step 219), first, the upper, middle, and lower operations of the abutting member are started (t1-T + t, t is a margin). After that, the L-axis drive in the front-rear direction starts and moves to the abutting position R2 in the next process. (Steps 221, 223) In this way, when the abutting member moves from the current abutting position R1 to the next abutting position R2, the die 9
If there is a possibility of collision with the back gauge side edge Q of the die 9, before and after the tip of the abutting member 41 arrives, the lower surface of the die 9 moves upward and downward so as to reach a position above the machining horizontal plane P. Directional drive control is performed to avoid collision with the die 9.

In the case of the second embodiment described above, the case where the current butting position R1 is at the rear position of the die 9 has been described. However, as shown in FIG. 6 of the first embodiment, conversely, when the current butting position is at the position R2 on the die 9 and the next butting position is R1, the Avoid the collision with the die 9 by driving the abutting member only in the front-back direction until it passes the edge Q on the back gauge side of 9 and also driving it in the vertical direction after passing the edge Q. You can

The present invention is not limited to the above-described embodiments, and various modifications are included as long as they do not exceed the scope of the technical idea shown in the claims.

EFFECTS OF THE INVENTION Since the present invention has the above-described configuration, when moving between the current butting position and the next butting position, a collision between the abutting member and the die may occur. Even in some cases, the abutting member is moved above the die before passing the back gauge side edge of the die from the back to the front, or until the abutting member of the die is passed backwards past the back gauge edge of the die. It is possible to automatically avoid a collision with a die without performing vertical driving.

[Brief description of drawings]

FIG. 1 is a perspective view of a bending machine to which an embodiment of the present invention is applied, FIG. 2 is a perspective view showing a back gauge in the bending machine, and FIG. 3 is a block diagram of an embodiment of the present invention.
FIG. 4 is an operation explanatory view for explaining the operation of the above embodiment, and FIG.
6 is a flow chart showing the back gauge forward movement control in the above embodiment, FIG. 6 is a flow chart showing the back gauge backward movement control in the above embodiment, and FIG. 7 is an abutting member and punch in another embodiment of the present invention. ,
FIG. 8 is a conceptual diagram showing a die portion, FIG. 8 is an explanatory view for explaining the operation of the above-mentioned embodiment, and FIG. 9 is a flow chart showing the operation of the above-mentioned embodiment. 1 …… Bending machine 7 …… Punch 9 …… Die 25 …… Back gauge 27 …… Supporter 29 …… Electric motor 31 …… Lead screw 33 …… Linear motion guide 35 …… Movable base 39 …… Elevation drive 41 …… Abutting member 43 …… Vertical drive means 45 …… Front-back direction drive means 47 …… Vertical position detection means 49 …… Front-back position detection means 51 …… Judgment means 53 …… Control means R1, R2 …… Abutting Position L1, L2 …… Front-back distance Z1, Z2 …… Vertical distance P …… Horizontal machining surface C …… Machining center line W …… Workpiece

Claims (1)

[Claims] 1. A front-back direction positioning means and a vertical direction positioning means of a back gauge, a front-back position detecting means and a vertical position detecting means of an abutting member of the back gauge, and a current position and a next time of the abutting member of the back gauge. Judging whether the change in the vertical position passes up and down the horizontal machining surface on the die and the change in the front-back position passes back and forth through the back gauge side edge of the die. Means and the determining means determines that the abutting member passes vertically through the horizontal machining surface of the die and forwards and backwards through the back gauge side edge of the die, the abutting is performed during the next machining. When the member approaches the die, the back surface of the abutting member is positioned above the edge of the die by the time the edge of the die is reached. When the abutting member is moved backward from the upper position of the die to the back gauge side by driving the up-and-down driving means of the gauge, the up-and-down movement of the abutting member is continued until it passes through the edge of the die. A back gauge abutment positioning device comprising a control means for stopping the movement of the directional driving means.