JPH0815622B2 - Tact time determination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a tact time determining device for a work in a bending machine such as a press brake.

(Prior art) For example, in a bending machine such as a press brake, the tact time is predicted before the bending of the workpiece and how long it takes to bend to the final shape, and used for process control. There is a need to.

Therefore, conventionally, the operator determines the takt time in such a bending machine by taking into consideration the gauging time in each bending step, the required bending time, the pullback time, the reversal time, etc. I was typing.

However, if the operator makes a judgment and inputs it by himself / herself in this way, the operator is burdened. Therefore, it is desired that the NC device side automatically determines the tact time.

(Problems to be Solved by the Invention) As described above, an automatic tact time determination device has been conventionally desired.

The present invention has been made in view of such a conventional problem, and provides a tact time determination device capable of automatically determining a tact time by calculating necessary input information by an NC device of a bending machine. The purpose is to

[Structure of Invention]

(Means for Solving Problems) The tact time determination device according to the present invention includes information input means such as a work shape and a bending order, and a gauging time, a bending time, a back gauge pullback time and the like from these information input means. A time element calculation means for calculating a time element required for each bending step, a reversal determination means for determining a work reversal method in each of the bending steps, and a time required for the determined method, and the reversal determination Means for calculating the predetermined time of each bending step from the calculation results of the means and the time element calculating means, and tact time adding means for adding the required time of each bending step until the final bending step of the work. It comprises and.

(Operation) In the tact time determination device of the present invention, necessary information such as the work shape and bending order is obtained from the input means, and the gauging time and the required bending time as time elements necessary for each bending process are obtained based on this necessary information. The pullback time of the back gauge is calculated, and the necessity of reversing the work before each bending process and the reversal time when reversing is necessary are calculated. The required time in each bending step is calculated from the calculation result with the means. Then, the takt time is determined by adding the time required in each of the bending steps up to the final bending step of the work. Therefore, it is possible to easily make a work plan or a production plan.

(Embodiment) FIG. 1 shows a folding machine 1 used in an embodiment of the present invention.
Is shown. This folding machine 1 has an upper apron 3 and
And a lower apron 5. A punch 7 is fixed below the upper apron 3 and a die 9 is fixed above the lower apron 5 with a plurality of bolts 11 via mold gripping members 13, 13. In this, the upper apron 3 or the lower apron 5 is inserted, for example, from the right direction with the bolt 11 loosened, and the bolt 11 is fixed by re-tightening the bolt 11 at an appropriate position.

A front cover 17 having a tool stand 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
The lower apron 5 is commanded to move up and down and the position of a back gauge to be described later is controlled. The operation panel 19 is provided with necessary input means for NC control, and the operation panel 19 is used to input data to an NC device (not shown).

A back gauge 25 is provided in the work processing space 23 between the upper apron 3 and the lower apron 5 of the folding machine 1 as shown in detail in FIG. The baggage 25 includes a plurality of support members protruding rearward near the left and right ends of the lower apron 5.
Equipped with 27.

The support 27 includes a lead screw 31 driven by an electric motor 29 and a linear motion guide 33 parallel to the lead screw 31.
It has. A movable base 35 is provided on the lead screw 31 and the linear motion guide 33. A beam 37 is horizontally passed between the left and right movable bases 35, 35, and the height can be adjusted by a lifting drive device 39.

The back gauge 25 is attached to the beam 37 so that it can be positioned left and right. Further, the abutting member 41 is provided in front of the back gauge 25. The height of the abutting member 41 is controlled by the elevation drive device 39 for the beam 37.

When performing bending of the work W by the bending machine 1, first, the work is inserted into the work processing space portion 23 of the bending machine 1 and the tip of the work is abutted by the back gauge 25 set at a predetermined position. Abut against the member 41. Next, drive the lower apron 5 against the upper apron 3,
Bending is performed between the punch 7 and the die 9.

When one bending process is completed in this way, the lower apron 5 descends from the upper apron 3 and the work is taken out. Then, in preparation for the next bending process, the abutting member 41 of the back gauge 25 is moved back and forth to a predetermined position and positioned by a command from the NC device. Then, the front end of the work is abutted and positioned so that the next bent portion of the work is located directly below the punch 7, and the bending process is performed again between the punch 7 and the die 9.

Further, depending on the bending portion, the work may be turned upside down, horizontally rotated by 180 °, further turned upside down, and horizontally rotated by 180 ° so that a predetermined processing portion is positioned immediately below the punch 7, Bending may be performed.

The bending process order up to the final processed shape of the work is specified by the NC device, and the gauging and pullback of the back gauge are automatically controlled according to the processing order.

An embodiment of a tact time determination device for such a folding machine 1 is shown in FIGS. 3 and 4. This tact determination device is provided with an input means 43 for inputting necessary information such as the final processed shape of the workpiece, dimensions, die information, and bending order. This input means 43 reads the data on the NC device side and calculates the maximum bending length, work weight, developed length, etc. (step
61, 62). The necessary information given by the input means 43 is given to the time element calculation means 45 and the inversion calculation means 47.

The time element calculation means 45 calculates the gauging time and pullback time of the back gauge 25 based on the information such as the maximum bending length, the work weight, and the work development length from the input means 43. Then, the reversal determination means 47 determines the method of reversing the work when shifting from one bending process to the next bending process (step 64). The determination of this inversion method is performed based on the flow shown in FIG.

There are three reversing methods for the work W: front and back reversal shown in FIG. 6A, front and back reversal and 180 ° horizontal reversal shown in FIG. 6B, and 180 ° horizontal reversal shown in FIG. is there. When it is determined that the inversion is one of these, an inversion mark is generated as shown in FIGS. 7 (a) to 7 (c).

Explaining the determination flow of this inversion method, first, the sign of the angle at the current bending point p3 and the sign of the angle at the next bending point p4 are examined (step 71).

Then, it is judged whether or not the signs of the angles at the current bending point p3 and the next bending point p4 are the same (step 72). Here, if the signs of the angles are the same, it is determined that the work W is bent in the same direction. In this way, the reversing method in which the bending is performed in the same direction is either the 180 ° horizontal reversal shown in FIG. 6 (c) or no reversal. Therefore, hereinafter, the flow proceeds to step 73 and subsequent steps to determine whether there is no inversion or 180 ° horizontal inversion.

In step 72, the current bend point p3 and the next bend point
If the sign of the bending angle is different from that of p4, it can be determined that the current bending process and the next bending process will be performed with the front and back reversed. The following steps are used to determine whether to invert or either.

If it is determined in step 72 that the angle signs of the bending points are the same, then the difference in the numerical values between the current butting point p2 and the bending point p3 is checked, and then the butting point at the next bending process ( In the case of FIG. 6 (c), the difference between the numerical values of p5 and p4) is examined (steps 73 and 74).

When the difference in step 73 and the difference in step 74 have the same sign, the front and rear of the work W are not interchanged, so there is no need to invert and no inversion mark is generated (steps 75 and 76).

In step 75, if the signs of the numerical differences in steps 73 and 74 are different, it can be determined that the front and rear of the workpiece will be inverted in the next bending process, and it will be determined that 180 ° horizontal inversion will be performed (step 77). ).

When the bending angle of the next bending point in step 72 is different from the sign of the bending angle of the current bending point, at least the front and back of the work W are reversed, and in step 78, the current butting point is first set. The difference between the numerical values of p2 and the bending point p3 is checked, and subsequently, in step 79, the difference between the numerical values of the abutting point and the bending point in the next bending process is checked.

In this way, the sign of the difference obtained in steps 78 and 79 is checked (step 80).

If the signs are the same in this step 80, it can be determined that the workpiece W cannot be replaced before and after,
Is determined to be simply turned inside out (step 81).

When the signs are different in step 80, it can be determined that the front and rear of the work W are also interchanged, and in this case, it is determined that the work W is horizontally inverted 180 ° together with the front / back inversion (step 82).

After the work reversing method in the case of shifting to a new bending process is determined in this way, the process returns to the flowchart shown in FIG. 4 to calculate the reversing time corresponding to each reversing method and The gauging time, the required bending time, and the pullback time are added to calculate the required time in one bending process (steps 65 to 68).

In this way, the required time in each bending process calculated by the process required time calculating means 49 is sequentially added in the takt time addition time 51 (step 69).

In this way, the required time in the bending process of the workpiece is sequentially added for all the bending points, and the takt time in the entire bending process is finally obtained (step 70).

In this way, in this embodiment, the required bending time, the pullback time, the reversal time, etc., which are determined according to the work shape, are automatically calculated, and the reversing method and its reversing time when shifting to each bending step are calculated. It is also possible to automatically determine the takt time of all the steps by automatically determining and also adding the required time in each bending step.

The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the technical idea described in the claims.

〔The invention's effect〕

Since the present invention has the above-described configuration, it is possible to automatically determine the tact time without relying on the experience of the operator as in the conventional case.

[Brief description of drawings]

FIG. 1 is a perspective view showing a folding machine used in an embodiment of the present invention, FIG. 2 is a perspective view of a back gauge device used in the folding machine, and FIG. 3 is an embodiment of the present invention. 4 is a flowchart for explaining the operation of the above embodiment, FIG. 5 is a flowchart for explaining the decision operation of the reversing method in the above embodiment, FIG. 6 is an explanatory view for explaining each reversing method, and FIG. FIG. 7 is an explanatory diagram showing an example of an inversion mark generated corresponding to each inversion method. 1 ... Bending machine 7 ... Punch 9 ... Die 25 ... Back gauge 41 ... Abutting member 43 ... Input means 45 ... Time element calculation means 47 ... Inversion determination means 49 ... Process required time calculation means 51 ... Tact time addition means

Claims (1)

[Claims] 1. An information input means such as a work shape and a bending order, and a time element calculation for calculating a time element necessary for each bending process such as a gauging time, a bending time and a back gauge pullback time from the information input means. Means, reversal determination means for determining a work reversal method in each of the bending steps, and calculating the time required for the determined method, and the reversal determination means and the time element calculation means A tact time determination device comprising: a process time calculating unit that calculates a required time of a bending process; and a tact time adding unit that adds the required time of each bending process up to the final bending process of a work.