JP2001353526A - Automatic die selection apparatus in bending apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the precedence order of a die for easily controlling bending while taking a die selection precedence item into account independent of a skill of an operator in the case of bending some work. SOLUTION: An apparatus is provided with an input means 17 which inputs the work information of a plate thickness, a material, etc., the product information of a bending angle, a bending line, etc., and the combination information of plural dies into a controller 13 of a bending apparatus, a working element arithmetic means 23 which operates the working elements required for the purpose of working a prescribed product of elongation value, work external radius, required ton number, stroke value, spring back quantity, etc., for respective die combinations inputted by the input means, a working element coefficient setting means 27 which sets the working element coefficients for respective working elements of respective die combinations operated and a die selection means 33 which calculates the evaluation value for the working element arithmetic means 23 and a prescribed product shape and selects the die having the working element that this evaluation value is high.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic die selecting apparatus in a bending apparatus capable of selecting an appropriate die when bending a work.

[0002]

2. Description of the Related Art Conventionally, before bending a workpiece,
The operator determined the mold based on his experience while looking at the drawings. In other words, in reality, it is determined whether or not a mold suitable for processing is determined based on the skill of an operator.

[0003]

Incidentally, (1) items to be considered by an operator to determine a mold include (A)
When the relation between the thickness of the work and the V width, that is, when the inner radius is desired to be small, Vt should be about 5 to 6.

(B) The bending work can be performed without interference between the work and the mold.

[0005] (C) A mold that matches the elongation value used in the calculation for developing the blank material.

[0006] is mainly. The above items are determined by the convenience of the worker.

(2) Even if the bending is performed at the same angle, the influence on the bending angle due to a change in the table position due to a change in the plate thickness or a change in the oil temperature can be reduced depending on the die selection.

[0008] The change in the opening of the frame (influencing the bending angle) due to the change in the required tonnage due to the difference in the stripping position and the roll position can be reduced by selecting the mold.

[0009] The workers generally do not know about them. Therefore, the mold selected by the operator is not always suitable for bending.

[0010] The elongation value, required tonnage,
The operator does not know how much the stroke value and the amount of springback affect.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to perform bending of a certain workpiece while taking into consideration the die selection priority regardless of the skill of the operator. It is an object of the present invention to provide an automatic die selecting device in a bending device in which the priority of a die whose processing can be easily controlled can be understood.

[0012]

According to a first aspect of the present invention, there is provided an automatic die selecting apparatus for a bending apparatus, wherein one of a punch and a die of a die is reciprocated by a controller. In a bending apparatus for bending a work by cooperation of a punch and a die at least, a work information such as a plate thickness and a material, a product information such as a bending angle and a bending line, and a combination of a plurality of dies are provided to the control device. An input means for inputting information, and a mold combination input by the input means for necessary processing elements such as an elongation value, an outside radius R, a required tonnage, a stroke value, and a springback amount for processing a predetermined product. Processing element calculating means for calculating each processing element, and a processing element for setting a processing element coefficient for each processing element for each mold combination calculated by the processing element calculating means. A coefficient setting unit, and a die selection unit that calculates an evaluation value for a predetermined product shape by the processing element calculation unit and the processing element coefficient setting unit, and selects a die having a processing element with a high evaluation value. It is characterized by becoming.

Therefore, before starting to bend the work, the input means of the control device inputs work information such as plate thickness and material, product information such as bending angle and bending line, and a plurality of mold combination information. The input die combination information is taken into the processing element calculation means to process a predetermined product for each die combination, so that necessary values such as elongation value, R outside work, required tonnage, stroke value, and springback amount are required. Calculate the processing element. Then, a processing element coefficient is set by the processing element coefficient setting means for each processing element for each mold combination calculated by the processing element calculation means. Then, the necessary processing element calculated by the processing element calculation means and the processing element coefficient set by the processing element coefficient setting means are taken into the die selection means, and an evaluation value for a predetermined product shape is calculated. A mold having a processing element with a high value is easily and easily selected.

According to a second aspect of the present invention, there is provided an automatic die selecting apparatus, wherein one of a die punch and a die is reciprocated by a control device and bent into a work by the cooperation of the punch and the die. In a bending apparatus for performing processing, input means for inputting work information such as plate thickness and material, product information such as bending angle and bending line, and a plurality of mold combination information to the control device, and processing a predetermined product. Processing element calculating means for calculating required processing elements such as elongation value, outside work R, required tonnage, stroke value, and springback amount for each mold combination input by the input means; Processing element coefficient evaluation means for evaluating a processing element coefficient for each mold combination based on product information and machine information input by means, and the processing element calculation means The processing element coefficient evaluating unit calculates an evaluation value for a given product shape, it is to the mold selecting means for selecting a mold having a high processing elements of the evaluation value, characterized in that it comprises a.

Therefore, before starting to bend the work, the input means of the control device inputs work information such as plate thickness and material, product information such as bending angle and bending line, and a plurality of mold combination information. The input die combination information is taken into the processing element calculation means to process a predetermined product for each die combination, so that necessary values such as elongation value, R outside work, required tonnage, stroke value, and springback amount are required. Calculate the processing element. Then, based on the product information and machine information input by the input means, the processing element coefficient is evaluated by the processing element coefficient evaluation means for each mold combination. The required processing element calculated by the processing element calculation means and the processing element coefficient evaluated by the processing element coefficient evaluation means are taken into the die selection means to calculate an evaluation value for a predetermined product shape. Molds with high working elements are easily and easily selected.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bending apparatus according to the present invention will be described below with reference to the drawings.

Referring to FIG. 2, for example, a press brake 1 as a bending device includes side frames 3 erected on the left and right sides, and driving means are provided on the left and right upper portions of the front portions of the side frames 3. For example, a hydraulic cylinder 5 is provided, and a piston rod 7 is mounted below each hydraulic cylinder 5. An upper table 9 is provided at the tip (lower end) of the piston rod 7. A punch P is provided below the upper table 9.
Are detachably attached.

A lower table 11 is fixedly provided at the lower front portion of the side frame 3. A die D is detachably mounted on the upper portion of the lower table 11 at a position corresponding to the punch P. Have been. A control device 13 for controlling the press brake 1 is provided beside the side frame 3.

With the above configuration, by controlling the control device 13, the hydraulic cylinder 5 is operated, and the upper table 9 reciprocates (vertically moves) with respect to the lower table 11 via the piston rod 7 and the punch P The work W to be processed is bent in cooperation with the die D. The upper table 9 may be fixed, and the lower table 11 may be reciprocated (moved up and down).

As shown in FIG. 1, the control device 13 includes a CPU 15, which includes work information such as plate thickness and material, product information such as bending angle and bending line, and a plurality of pieces of information. Input means 17 such as a keyboard for inputting mold combination information and the like is connected and various data are displayed, for example, CR.
Display means 19 such as T is provided.

The plate thickness input by the input means 17;
A data memory 21 for storing work information such as material, product information such as bending angles and bending lines, and information on a plurality of mold combinations, and for each mold combination based on the information stored in the data memory 21. Machining element computing means 23 for computing necessary machining elements such as elongation value, outside work R, required tonnage, stroke value, and springback amount for machining a predetermined product. Processing element coefficient setting means 2 for setting a processing element coefficient for each processing element for each mold combination
5, processing element coefficient evaluation means 27 for evaluating a processing element coefficient for each mold combination based on the input product information and machine information, and a processing element and processing element coefficient setting calculated by the processing element calculation means 23. A first evaluation value calculating unit 29 for calculating an evaluation value for a predetermined product shape based on the processing element coefficient set by the unit 25; a processing element calculated by the processing element calculating unit 23;
7, a second evaluation value calculator 29 for calculating an evaluation value for a predetermined product shape based on the processing element coefficient evaluated in step 7, and a higher evaluation value calculated by the first and second evaluation value calculators 29 and 31. A die selecting means 33 for selecting a die having a processing element is connected to the CPU 15.

With the above configuration, the operation of mold selection is shown in FIG.
Referring to the flowchart shown in FIG.
First, in FIG. 3, in step 1, the input means 17 is used to input work information such as plate thickness and material, elongation value when forming a blank material, bending angle, and product information outside the bending length R (inside R). At the same time, a bending stroke control (D value control) is performed by calculating a relative distance between the punch P and the die D to be at a predetermined angle, and a workpiece is bent by controlling the insertion angle of the workpiece in consideration of a springback amount by a bending angle detecting device. The presence or absence of a detection plate (detection device) that directly detects the relative distance between the punch P and the die D without considering the control method of the processing insert control, the pressurizing ability, and the deflection of the mechanical system in advance, The machine information of the driving method (hydraulic type, ball screw type) and the mold combination information owned by the user as shown in FIG. Previously allowed memory.

In step 2, for each combination (1 to 7) of the target dies, the processing element calculating means 23 calculates the elongation value f _1.
(Material, mold), Rf ₂ outside the work (material, mold), required tonnage f ₃ (material, mold), stroke value f ₄ (material, mold)
The result of calculating the springback amount is a value as shown in FIG. 6, for example. In step 3, a weight as an evaluation value of each item is calculated for all mold combinations. For example, when calculated by the first evaluation value calculation means 29 as follows, the values shown in FIG. 7 are obtained.

Estimated elongation value = absolute value (elongation value at the time of blank material production−calculated value) × para1 Out of R value = absolute value (outside product R−calculated value) × para
2 Required tonnage weight = (calculated value-minimum value in table) x par
a3 Stroke value = (maximum value in the table-calculated value) x pa
ra4 Springback amount = (calculated value-minimum value in the table)
× para5 The above elongation value at the time of blank material creation and the value of R outside the product have been entered in step 1, the above calculated values have been entered in step 2, and the minimum value in the table is the combination of each mold in step 2. Means the minimum value of the required tonnage and the amount of springback among those calculated. The maximum value in the table refers to the maximum value of the stroke value among the values calculated for each mold combination in step 2. para1 to 5 can be set arbitrarily.

Next, in FIG. 4, in step 4,
From the control method / machine information, which is the condition input in step 1, the parameters para6-1 to para5 used in step 5
0 is automatically determined, for example, as shown in FIG. For example, in FIG. 8, the method is roughly divided into a control method (D value control / sandwich control), mechanical information (with / without detection plate), and a table driving method (hydraulic / ball screw type).

For example, as an area of the D value control, hydraulic driving without a detection plate is considered as a basic condition. In the D value control, since the angle is determined by the mutual distance between the punch and the die, para9 relating to the stroke parameter becomes 1 (higher priority), and the D value is calculated in consideration of the deflection of the mechanical system. The tonnage parameter is para8 (higher priority).

Based on this, parameters for other conditions of the D value control are determined. For example, under the condition of the detection plate and the ball screw type, the stroke parameter para9 is 1 (higher priority) as in the basic pattern. The required tonnage parameter has a detection plate, and the mutual distance between the punches and dies can be directly detected without considering the deflection of the mechanical system. Therefore, the required tonnage parameter is 7 (low priority).

Next, a case of the pinching control will be described.

Hydraulic drive without a detection plate in pinching control is used as a basic pattern. The entrapment control is performed at the target angle (90
°), the springback parameter (para10) becomes 1 (higher priority) due to the control to drive the pinching angle (88 °) minus the springback (2 °).
Conversely, the stroke parameter para9 is 5 (low priority).

For this basic pattern, under the condition of the ball screw type having the detection plate, the required tonnage parameter para8 is 9 because of the presence of the detection plate, and the priority is lower, and the stroke parameter para9 is also lower. The priority is lower.

Regarding the elongation value parameter para6 which is an item related to the back gauge (B / G), the elongation value parameter para is used when the back gauge (B / G) is highly accurate.
6 is set to “1” to give priority. Back gauge (B /
G) In the case of low precision, the priority is slightly lowered with respect to other items and is set to “2”.

Since the outer radius has no direct relation with the control method / mechanical information / driving method / B / G, it will not be described here. If it is desired, para2 in step S3 may be reduced (higher priority).

In FIG. 8, the lower numerical value of each parameter is a numerical value obtained by stabilizing the overall condition (increase the weight of another item (decrease the difference) and reduce the difference) as "Idea 2".

In step S5, each of the item parameters para6 to para10 calculated in step S4 is replaced in step S3.
By multiplying the numerical value of each item by the calculated value, the final overall calculated value is calculated. That is, it is calculated by the following equation.

Total rice = elongation value rice x para6
+ Outer radius pad x para7 + required tonnage pad x para8 + stroke pad x para9 + springback pad x para10 In step S6, the priority order of each item is determined, so that the mold (punch, Die) is determined. For example, FIG.
As shown in the table, the priority is set to 1, 2, 3,... In step S7, if there is no user's designation of the mold, the process ends as it is. If there is the user's designation of the mold, the process proceeds to step S8, and the final decision is made in consideration of the user's mold selection and prioritization to be used. Give priority and finish.

Accordingly, a worker can easily recognize a metal mold whose bending angle is less likely to vary due to disturbance (variation in plate thickness, change in table position, difference between rolls, etc.) during bending. By selecting this mold, the variation in the product angle during bending is reduced, so that a result according to the machine used and the control method can be obtained.

It is possible to give priority to the most suitable mold for obtaining a target finish angle in consideration of a machine to be used, a control method, and the like. For example, when the finish angle is sensitive to the stroke, it is difficult to set a target finish angle in stroke control. This leads to an increase in the number of trial bending.

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes. In the above-described embodiment, an example has been described in which the control of the bending apparatus automatically selects the die. However, the control of the bending apparatus such as an automatic programming apparatus automatically selects the die. It is also possible to cope with it by performing it. In general, the elongation value / outside R is close to the product information, the stroke is long,
The parameters are determined so that the priority order of the dies that reduces the required tonnage and the springback becomes higher, but it does not matter. In the material information, a value obtained by assigning the plate thickness and the material constant within a certain range may be given, and the weight of each item with respect to the upper and lower limits may be calculated. For example, each item value (elongation value
There is a method of calculating the total weight by taking the subtraction of each item value of 1.24 mm and each item value of 1.24 mm as the weight of each item. For example, when the change in each item value is reduced when the plate thickness changes. Similarly, it is the same even if the material constant is changed.

[0039]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, the plate thickness, the sheet thickness, Work information such as material, product information such as bending angle, bending line, etc. and multiple mold combination information are input, and the input mold combination information is taken into the processing element calculation means, and a predetermined product is set for each mold combination. In order to machine the workpiece, necessary machining elements such as an elongation value, an outside radius R, a required tonnage, a stroke value, and a springback amount are calculated. Then, a processing element coefficient is set by the processing element coefficient setting means for each processing element for each mold combination calculated by the processing element calculation means. Then
The evaluation value for a predetermined product shape is calculated by the die selection means based on the required processing element calculated by the processing element calculation means and the processing element coefficient set by the processing element coefficient setting means, and the processing having a high evaluation value is performed. Easy to mold with elements
And it can be easily selected.

According to the second aspect of the present invention, before starting the bending work on the work, the work information such as plate thickness and material, the product information such as the bending angle and the bending line and the plurality of metal sheets are inputted from the input means of the control device. The mold combination information is input, and the input mold combination information is taken into the processing element calculation means to process a predetermined product for each mold combination, and the elongation value, the outside R of the work, the required tonnage, the stroke value, Necessary processing elements such as springback amount are calculated. And the product information input by the input means,
The processing element coefficient is evaluated by the processing element coefficient evaluation means for each mold combination based on the machine information. The processing element calculated by the processing element calculation means and the processing element coefficient evaluated by the processing element coefficient evaluation means are taken into the die selecting means to calculate an evaluation value for a predetermined product shape, and the processing having a high evaluation value is performed. The mold having the elements can be selected easily and easily.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a bending apparatus according to the present invention.

FIG. 2 is a side view of a press brake as a bending device according to the present invention.

FIG. 3 is a flowchart illustrating selection of a bending mold according to the present invention.

FIG. 4 is a flowchart illustrating selection of a bending mold according to the present invention.

FIG. 5 is an example diagram of a target mold combination table.

FIG. 6 is a diagram showing a bending calculation result of each target mold combination.

FIG. 7 is a diagram showing a result of a fir calculation for each item.

FIG. 8 is a diagram showing parameters determined from control method / machine information.

FIG. 9 is a diagram showing the calculation of the total weight and the priorities determined and shown.

[Explanation of symbols]

 Reference Signs List 1 press brake (bending device) 13 control device 17 input means 21 data memory 23 processing element calculation means 25 processing element coefficient setting means 27 processing element coefficient evaluation means 29 first evaluation value (weight) calculation means 31 second evaluation value ( Weight) Calculation means 33 Mold selection means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C042 RG01 RG04 RL13 4E050 CC04 CD07 4E063 BA07 DA13 LA19

Claims (2)

[Claims] An input means for inputting work information such as plate thickness and material, product information such as a bending angle and a bending line, and a plurality of mold combination information to a control device, and an extension device for processing a predetermined product. Processing element calculating means for calculating required processing elements such as values, outside work R, required tonnage, stroke value, springback amount, etc. for each mold combination inputted by the input means; A processing element coefficient setting means for setting a processing element coefficient for each of the calculated processing elements for each mold combination; and an evaluation value for a predetermined product shape calculated by the processing element calculation means and the processing element coefficient setting means. And a die selecting means for selecting a die having a processing element having a high evaluation value. 2. An input means for inputting work information such as a plate thickness and a material, product information such as a bending angle and a bending line, and a plurality of mold combination information to a control device, and an extension device for processing a predetermined product. Processing element calculating means for calculating necessary processing elements such as values, outside work R, required tonnage, stroke value, springback amount, etc., for each mold combination input by the input means, and input by the input means. Processing element coefficient evaluation means for evaluating a processing element coefficient for each mold combination based on the obtained product information and machine information, and an evaluation value for a predetermined product shape calculated by the processing element calculation means and the processing element coefficient evaluation means. An automatic die selecting device for a bending device, comprising: a die selecting device that selects a die having a processing element having a high evaluation value.