JP4883668B2 - Bending apparatus, mold arrangement method and mold stocker selection method - Google Patents

Description

  The present invention relates to a bending apparatus, a mold arrangement method, and a mold stocker selection method having a mold storage portion in which a pair of molds each including a punch and a die are stored via a stocker.

  Conventionally, in a punching machine, for example, as disclosed in Japanese Patent Application Laid-Open No. 61-99529, each time a ram hits a mold, the number of times the mold is used is counted, and the counted use A mold management device is provided that issues an alarm when the number of times reaches a preset number of times of useful use.

  However, in the press brake, unlike the punching machine, the die layout in the processing station on the ram is composed of a plurality of divided dies, and the number of times the ram is operated and the number of times the die is used are 1: 1. Therefore, the mold management device disclosed in Japanese Patent Laid-Open No. 61-99529 cannot be applied to a press brake.

Accordingly, the applicant of the present application filed a patent application on June 15, 2005 for a die management apparatus based on a method of counting the number of times each die is used for actually bending a workpiece (Japanese Patent Application No. 2005-2005). 175300).
JP-A-61-99529

  In addition, in the conventional press brake, whether the mold management device disclosed in Japanese Patent Laid-Open No. 61-99529 or the mold management device disclosed by the present applicant is used, For a mold that does not reach, a mold layout is created by the following operation.

  For example, when creating a mold layout in a processing station having a length of 470 mm, first, a long mold stocker h1 whose cross-sectional shape is A, for example, in the mold (punch) storage unit 2 (FIG. 2). Is moved to the side of the upper table 12 (FIG. 18A), and then the seven molds (identification (ID) numbers 1 to 7) stored in the long mold stocker h1 are stored. Only the ID numbers 1 to 4 are inserted into the upper table 12 side (FIG. 18A) by the die (punch) changer 2A (FIG. 1).

  In this state, among the molds inserted on the upper table 12 side (FIG. 18B), the molds having ID numbers 2 to 4 are moved to the left side, so that there is a gap between the molds having ID numbers 1 and 2. Form.

  Thereafter, this time, the short mold stocker t (FIG. 2) having a cross-sectional shape A is moved to the side of the upper table 12 (FIG. 18C), and the short mold stocker t is moved to the short mold stocker t. Among the stored molds, molds with ID numbers 5 (length 20 mm) and 13 (length 50 mm) are inserted into the gap on the upper table 12 side.

  Finally (FIG. 18D), a mold layout having a length of 470 mm can be created if the gaps are eliminated by gathering the molds on the upper table 12 side.

  However, as described above, the conventional mold selection method is a method in which both the long mold stocker h1 and the short mold stocker t are sequentially selected from a mold having a small ID number. This also applies to the mold storage unit 3 (FIG. 2) in which the die is stored. .

  Therefore, as shown in FIG. 17, conventionally, a mold with a small ID number is used more frequently than a mold with a large ID, and the proportion of wear of the punch tip and die shoulder is increased accordingly. .

  As a result, as shown in FIG. 19, the angles α, β, and γ along the bending line m portion of the processed workpiece W are not equal to each other, the bending angles are reduced, and the accuracy is reduced.

  In other words, conventionally, since the number of times the mold is used (FIG. 17) is biased toward a mold with a small ID number, the wear state is also biased toward a mold with a small ID number, which is uneven. The accuracy was reduced.

  An object of the present invention is to provide a bending apparatus, a mold arrangement method, and a mold stocker selection method that perform a bending process with high accuracy by making the wear state of the mold uniform.

In order to solve the above problems, the present invention provides:
As described in claim 1,
A pair of molds composed of a punch P and a die D are stored together via a stocker, and the mold storage units 2 and 3 and the mold storage units 2 and 3 and the upper and lower tables 12 and 13 are connected to the molds P and D. In the bending apparatus 1 having the mold exchanging apparatuses 2A and 3A for exchanging ,
A mold use number detecting means 20E for detecting the use number of the molds P and D in each stocker;
Based on the detected number of times the mold is used, the mold storage units 2 and 3 and the mold changers 2A and 3A are driven and controlled, and the molds P and D in each stocker are rearranged in a predetermined order. A bending apparatus characterized by having rearrangement means 20F;
As described in claim 3,
A pair of molds composed of a punch P and a die D are stored together via a stocker, and the mold storage units 2 and 3 and the mold storage units 2 and 3 and the upper and lower tables 12 and 13 are connected to the molds P and D. In the bending apparatus 1 having the mold exchanging apparatuses 2A and 3A for exchanging ,
A die use frequency sum calculating means 20G for calculating the sum of the use times of the molds P and D for each stocker or for each combination of the mold groups or for both,
A bending apparatus characterized by comprising a mold stocker selection means 20H for selecting a predetermined stocker, a combination of predetermined mold groups, or both based on the calculated total number of times of mold use;
As described in claim 5,
A mold arranging method in the bending apparatus 1 according to claim 1,
(1) After detecting the number of uses of the molds P and D in each stocker,
(2) Based on the detected number of times the mold is used, the mold storage units 2 and 3 and the mold changers 2A and 3A are driven and controlled, and the molds P and D in each stocker are arranged in a predetermined order. A mold arrangement method characterized by changing, and
As described in claim 7,
A mold stocker selection method in the bending apparatus 1 according to claim 3,
(1) After calculating the total number of times the molds P and D are used for each stocker or for each combination of mold groups or for both,
(2) Taking a technical means of a mold stocker selection method, which selects a predetermined stocker and / or a combination of a predetermined mold group based on the calculated total number of times the mold is used. ing.

  According to the configuration of the present invention, there are the first method (FIG. 11) and the second method (FIGS. 13 and 14), and the first method (FIG. 11) is the number of times the ram 12 (FIG. 1) is driven. This is performed periodically every time a predetermined value is reached, and the molds in each of the stockers h1 (FIG. 4), h2, h3, t (FIG. 5) of the mold storage units 2 and 3 are rearranged in ascending order of use. The second method (FIGS. 13 and 14) is always performed when a mold layout having a predetermined length (for example, FIG. 15) is created, and the sum of the number of times the mold is used is minimized. This is a method of selecting a stocker (FIG. 13), or a combination of mold groups having the smallest sum of the number of times the mold is used (FIG. 14), or both. 17) Since the number of times the mold is used is averaged, the wear state of the mold is made uniform, As accuracy can be performed with good bending.

  As described above, according to the present invention, it is possible to provide a bending apparatus, a mold arrangement method, and a mold stocker selection method that perform a bending process with high accuracy by making the wear state of the mold uniform. There is.

Hereinafter, the present invention will be described with reference to the accompanying drawings by embodiments.
FIG. 1 is an overall view of the present invention.

  The bending apparatus 1 shown in FIG. 1 is, for example, a press brake. The press brake 1 has side plates 16 and 17 on both sides of a machine main body, and a ram drive source on the upper side of the side plates 16 and 17. For example, the upper table 12 is attached via hydraulic cylinders 14 and 15, and a punch P that is one mold is attached to the upper table 12 via a punch holder 30.

  In addition, a lower table 13 is disposed below the side plates 16 and 17, and a die D that is the other mold is mounted on the lower table 13 via a die holder 31.

  With this configuration, after positioning the work W against the back gauge abutments 10, 11 disposed behind the lower table 13, the operator depresses the foot pedal 7, for example, so that the hydraulic cylinders 14, 15 are moved. When the upper table 12, which is a ram, is operated and lowered, the workpiece W is bent by the cooperation of the punch P and the die D, which are the pair of molds.

  As shown in FIG. 1, mold storage units 2 and 3 and mold changers 2A and 3A are installed on the sides of the upper table 12 and the lower table 13 (see, for example, WO 00/41824). Disclosure).

  In this case, in each of the mold storage units 2 and 3, a split mold including a long mold and a short mold having a predetermined length and a predetermined cross-sectional shape is stored via a stocker (for example, (Disclosed in the aforementioned WO00 / 41824).

  For example, as shown in FIG. 2, the mold (punch) storage unit 2 is divided into four regions A to D for each mold having the same cross-sectional shape (for example, a straight sword type or a gooseneck type). In the region, a long mold stocker and a short mold stocker are sequentially arranged from the side closer to the upper table 12 (FIG. 1).

  That is, in the area A (FIG. 2), three long mold stockers h1, h2, h3 and one short mold stocker t, and in the B area, three long mold stockers h1, h2 H3 and one short mold stocker t for the C region, two long mold stockers h1 and h2 and one short mold stocker t for the D region and two long molds for the D region. A total of 14 stockers are arranged, such as stockers h1 and h2 and one short mold stocker t.

  Of these, as is well known, the long mold stocker h1 (h2, h3) has the same structure as the mold (punch) holder 30 on the upper table 12 side (FIG. 1). As shown in FIG. 3, the frame can be supported on the frames 2 ′ and 2 ″ of the mold storage portion 2 through brackets 21 and 22 at both ends.

  The long mold stocker h1 (h2, h3) includes, for example, ID numbers 1 to 7 (ID numbers 8 to 14, ID numbers 15 to 15) having a length (X-axis direction) of 100 mm, as shown in the figure. 21) 7 long dies are mounted.

  That is, in the long mold stocker h1 (h2, h3), a long mold having a small ID number is closer to the upper table 12, and a long mold having a large ID number is far from the upper table 12. Each type is mounted.

  Similarly, the short mold stocker t has the same structure as the mold (punch) holder 30 on the upper table 12 side (FIG. 1), and as shown in FIG. And can be supported by the frames 2 ′ and 2 ″ of the mold storage unit 2.

  The short mold stocker t includes, for example, four short molds having ID numbers 1 to 4 having a length (X-axis direction) of 15 mm and short IDs having ID numbers 5 to 8 having a length of 20 mm. 4 molds, 3 25mm short molds with ID numbers 9-11, 1 short mold with 30mm ID number 12, 1 short mold with 50mm ID number 13, 1 60mm ID One short metal mold with a number 14 and one short metal mold with an ID number 15 of 80 mm are mounted.

  That is, in the short mold stocker t, for each group of molds of the same length, a short mold having a large ID number is closer to the upper table 12 and a ID number is smaller from the upper table 12. Short molds are mounted on each.

  What has been described above is the configuration of the punch-side mold storage section 2 (FIG. 2), the punch-side long mold stockers h1, h2, and h3 (FIG. 4) and the short mold stocker t (FIG. 5). The same applies to the die-side mold storage unit 3 (FIG. 3).

  In the following description, for simplification of description, the punch side mold (particularly the A area punch mold) stored in the mold storage unit 2 (FIG. 2) will be described in detail. The same applies to the punch dies in the B to D regions and the die dies stored in the die storage unit 3 (FIG. 3).

  With this configuration, the long mold stocker h1 (FIG. 4), h2 and h3, and the short mold stocker t (FIG. 5) have been conventionally used as shown in FIG. 17 (FIG. 17). The mold was used frequently and therefore the number of uses was uneven.

  In the present invention, a method of counting the number of times of use of each mold for actually bending a workpiece (FIGS. 6 to 9), which will be described later, or disclosed in the above-mentioned conventional JP-A 61-99529. The method shown in FIG. 11 described later and the method shown in FIGS. 13 and 14 are performed in a state where the number of times of use of the mold is grasped by a method of counting the number of times of use of the mold in proportion to the number of times the ram is operated Thereby, the wear state of the mold is made uniform by averaging the number of times the mold is used.

  The press brake NC device 20 having the above configuration (FIG. 1) includes a CPU 20A, an input / output means 20B, a storage means 20C, a machining information determination means 20D, a mold use frequency detection means 20E, and a mold rearrangement. A means 20F, a mold usage count sum calculating means 20G, and a mold stocker selecting means 20H are included.

  The CPU 24A performs overall control of the entire apparatus shown in FIG. 1, such as the machining information determination means 20D, the mold usage count detection means 20E, and the mold rearrangement means 20F in accordance with an operation procedure (for example, equivalent to FIG. 10) for carrying out the present invention. To do.

  The input / output means 20B constitutes an operation panel attached to the press brake. As is well known, the input / output means 20B has an input means such as a keyboard and an output means such as a screen. For example, product information or the like can be input automatically or manually, and the input result can be confirmed on a screen.

  In this case, the product information is, for example, CAD (Computer Aided Design) information, and includes information such as the plate thickness, material, bend line length, bend angle, and flange dimension of the work W (FIG. 6). It is configured as a figure and development.

  The storage means 20C (FIG. 1) stores a program for carrying out the present invention, as well as a die for each bending order determined by a machining information determination means 20D, which will be described later, a die layout, a work position, other D values, Information necessary for processing such as the L value is stored as the database 20C1 (FIG. 8).

  Also, the storage means 20C (FIG. 1) is an actual of the long mold and the short mold stored in the mold storage unit 2 (FIG. 2) and 3 (FIG. 3) described above via the stocker. The area where the number of times of use is accumulated (for example, FIG. 9) is stored as the mold storage database 20C2.

  The processing information determination means 20D (FIG. 1) determines the bending order (1), (2), (3), (4) based on the product information input via the input / output means 20B. For each bending order, molds and mold layouts a, b, c, and d for processing the workpiece W, positions of the workpiece W (left and right direction), other D values, L values, etc. are determined (steps 101 to 101 in FIG. 10). Step 102).

  For example, as shown in FIG. 6, the bending lines m1, m2, m3, and m4 of the flat work W are bent in the order of (1), (2), (3), and (4), and finally As shown in the figure, a product on which the flanges F1, F2, F3, and F4 stand is processed (for example, disclosed in WO98 / 01243 (particularly FIGS. 3 to 5)).

  For the workpiece W (FIG. 6) in this case, each bending order (1), (2), (3), (4) when the machining information determination means 20D determines the bending order (FIG. 1) and the like. FIG. 7 shows the relationship between the workpiece position and each processing station ST1, ST2, and FIG. 8 shows the determination result.

  In FIG. 7, processing stations ST1 and ST2 are provided.

  The processing station ST1 is, for example, for a short die as well as a die having ID numbers 1 to 4 stored in a long die stocker h1 (FIG. 4) whose cross-sectional shape on the punch side is A (FIG. 2). It is constituted by a mold having an ID number 12 stored in the stocker t (FIG. 5).

  Similarly, the processing station ST2 has the molds with ID numbers 5 to 6 stored in the long mold stocker h1 (FIG. 4) and the ID stored in the short mold stocker t (FIG. 5). It is comprised by the metal mold | die of No.13 and 1.

  In such processing stations ST1 (FIG. 7) and ST2, the workpiece W is bent lengths L1, L2, L3, L4 shown in the order of bending (1), (2), (3), (4). Are bent at predetermined bending positions X1, X2, X3, and X4, and in this case, molds constituting the mold layouts a, b, c, and d Is used.

  For example, in the bending order (1), since the bend line m1 portion is processed, all the molds constituting the mold layout a in the processing station ST1 are used.

  In this case, the fact that the die is actually used can be understood by actually bending the workpiece W (the die contacts the workpiece W or the die receives a reaction force from the workpiece W). ).

  For example, when an operator steps on the foot pedal 7 (FIG. 1), the hydraulic cylinders 14 and 15 are actuated to lower the ram 12 so that the mold comes into contact with the workpiece W or receives a reaction force from the workpiece W. Then, the values of the pressure gauges 5 and 6 connected to the hydraulic cylinders 14 and 15 increase.

  Therefore, when the change of the values of the pressure gauges 5 and 6 is detected by the detection unit 20C3, it is considered that the corresponding mold is used. For example, in the case of the bending order (1) (FIG. 7), With the operation of the ram 12, the long molds with ID numbers 1, 2, 3, and 4 and the short mold with ID numbers 12 are used once, respectively, and therefore through the adder 20C4 (FIG. 1), 1 is added to the corresponding area of the mold storage database 20C2 (FIG. 9).

  In this case, which die is used for each bending order (1), (2), (3), (4) is determined based on the processing information determination means 20D (FIG. 1) based on FIG. ) Is determined from the determined mold layouts a, b, c, and d (corresponding to the circles in FIG. 8).

  If the processing information database 20C1 is monitored (FIG. 1), the adder 20C4 knows which mold is used each time it receives a detection signal from the detection unit 20C3, and as described above. In addition, 1 is added to the corresponding area of the mold storage database 20C2 (FIG. 9).

  In this case, as is clear from FIG. 7, not only when the bending line portion of the workpiece W is in contact with the entire length of each die (for example, bending order (1), (3), (4)), but approximately 1 of the total length. / 2 (for example, in the bending order (2), the bend line m2 part is in contact with almost half of the long die with ID number 2). 1 can be used.

  However, in FIG. 7, when the bending line portion of the workpiece W described above is in contact with almost half of the entire length of the mold (in the case of bending order (2)), the number of uses may be set to 0.5. It can also be set to 0 (assuming it is not used).

  Thus, the method of counting the number of times the mold is used is arbitrary, and the operator can set it in advance.

  For example, when the processing information such as the mold layout is determined (step 102 in FIG. 10), the operator can add to the adder 20C4 via the input / output means 20B (FIG. 1) before starting the processing. You can set how to count the number of molds used.

  The mold usage count detection means 20E (FIG. 1) refers to the mold storage database 20C2 and detects the usage count of each mold.

  The mold storage database 20C2 in this case (FIG. 9) accumulates the number of times the molds stored in the mold storage units 2 (FIG. 2) and 3 (FIG. 3) described above have been used in bending. For example, it is provided in the storage means 20C (FIG. 1).

  As shown in FIG. 9, the mold storage database 20C2 has the same configuration as the mold storage units 2 and 3 (FIGS. 2 to 5) described above, and each mold in each stocker. In addition, an area in which the number of uses is accumulated is provided.

  With this configuration, when the ram 12 (FIG. 1) is operated, as described above, 1 is added to the predetermined use frequency area of the mold storage database 20C2 via the detection unit 20C3 and the adder 20C4.

  The mold rearranging means 20F rearranges the molds in each stocker in ascending order of use.

  That is, when the mold use frequency detecting means 20E refers to the mold storage database 20C2 (FIG. 9) and detects the number of times each mold is used, the mold rearranging means 20F It is assumed that a mold having a larger ID number has a smaller number of uses, and a mold having a smaller ID number has a greater number of uses (● in FIG. 17).

  As a result, the mold rearranging means 20F (FIG. 1) drives and controls the mold storage units 2 and 3 and the mold exchanging devices 2A and 3A. For example, as shown in FIG. Rearrange.

  That is, FIG. 11 is a method of rearranging the molds in the stockers h1 (FIG. 4), h2, h3, t (FIG. 5) described above in ascending order of use.

  In this case, first, for example, the long mold stockers h1, h2, and h3 in the A region in the mold storage unit 2 (FIG. 2) are sequentially moved to the side of the upper table 12 (FIG. 11A). Then, all the molds having ID numbers 1 to 21 are inserted into the upper table 12 side (FIG. 11A) using the mold changer 2A (FIG. 1).

  In this state, again using the mold exchanging device 2A (FIG. 1), the order of the long dies with ID numbers 1 to 21 inserted on the upper table 12 side is changed, and it is far from the side closer to the upper table 12. On the other hand, the molds are rearranged so as to have ID numbers 21 to 1 (FIG. 11B).

  At this stage, the long mold stockers h1, h2, and h3 that have become empty are temporarily returned to their original positions (FIG. 2) in the mold storage unit 2.

  Next, after moving the short mold stocker t in the area A in the same mold storage unit 2 (FIG. 2) to the side of the upper table 12 (FIG. 11C), the same length is obtained. For each mold group, the mold changing device 2A is used (FIG. 1) and rearranged in ascending order of use (FIG. 11D).

  For example, for the mold groups with ID numbers 1 to 4 (FIG. 11C), the molds are rearranged to ID numbers 4 to 1 (FIG. 11D).

  Then, the short mold stocker t in which the molds are rearranged is returned to the original position of the mold storage unit 2 (FIG. 2).

  Finally (FIG. 11 (E)), the long molds rearranged in the ID numbers 21 to 1 remaining on the upper table 12 side are sequentially moved from the mold storage unit 2 (FIG. 2) side to the upper table 12 side. The mold changer 2A is moved to each of the moved empty long mold stockers h1, h2, and h3 (FIG. 1), respectively, and then moved back to the original position (FIG. 2).

  The method shown in FIG. 11 is performed when the ram 12 is driven a predetermined number of times (FIG. 1), that is, periodically every predetermined number of times the ram 12 is driven (YES in step 105 in FIG. 10). To Step 106).

  Further, as described above, the mold rearranging means 20F drives and controls the mold storage units 2 (FIG. 1) and 3 and the mold exchanging devices 2A and 3A and rearranges the molds simultaneously (see FIG. 11) As shown in FIG. 12, the contents of the mold storage database 20C2 are also rearranged.

  That is, in FIG. 12, as is clear from FIG. 9 before the molds are rearranged, the arrangement of the molds in each stocker h1, h2, h3, t is the actual mold arrangement (see FIG. 11 (D) and FIG. 11 (E)).

  Accordingly, in FIG. 12, the number of times of use is also rewritten, and the number of times of use of the mold is small if the ID number is large, and if the ID number is small, the mold numbers are in order of ID numbers 1 to 21. The number of uses is decreasing.

  For example, the number of uses of the mold with ID number 21 of the long mold stocker h1 is the smallest, and the number of uses of the mold with ID number 1 of the long mold stocker h3 is the largest.

  According to the present invention shown in FIG. 11, the molds are rearranged in ascending order of the number of times of use, so that the number of times of use of the molds is averaged as compared with the prior art (FIG. 17). Since the state is made uniform, it is possible to perform bending with high accuracy.

  On the other hand, the die use frequency total calculating means 20G (FIG. 1) calculates the sum of the number of times the mold is used for each stocker (FIG. 13) and for each combination of mold groups (FIG. 14).

  Further, the mold stocker selection means 20H (FIG. 1) selects a stocker or the like having the smallest sum of the number of times of use of the molds calculated by the mold use number sum calculation means 20G.

  That is, FIG. 13 and FIG. 14 show that the sum of the number of times the mold is used is minimum according to the length of the mold layout of the predetermined processing station determined by the processing information determination means 20D described above (FIG. 1). This is a method of selecting a stocker (FIG. 13), a combination of mold groups (FIG. 14), or both (FIGS. 13 and 14) in which the total number of times the mold is used is minimum.

  In this case, for example, a mold layout having a length of 470 mm shown in FIG. 15 is created.

First, similarly, the mold storage of FIG. 16 in which the number of times each mold is used in the long mold stockers h1, h2, h3 in the area A of the mold storage unit 2 (FIG. 2) is accumulated. using a database 20C2, the mold number of uses the total sum calculation unit 20G is, for each stocker h1, h2, h3, and calculates the sum S _h1, S _h2, S _h3 mold usage count.

For example, as shown in FIG. 13, the stocker h1 a number of uses (FIG. 13 (C)) die ID No. 1 which is stored in the case of a like N _1, for each stocker h1, h2, h3 As shown in the figure, the sums S _h1 , S _h2 and S _{h3 of the} number of times the mold is used are calculated.

When the mold stocker selection means 20H (FIG. 16) determines that the total number of molds used _Sh3 (FIG. 13A) is minimum, that is, a mold having a large ID number is stored. When it is determined that the total sum _Sh3 is the minimum for the stocker h3, the stocker h3 is selected.

  Then, as already described (FIG. 15), a portion occupying 400 mm (100 mm × 4) of the 470 mm long mold layout from the stocker h3 using, for example, a long mold having ID numbers 15 to 18 Is created.

Next, using the mold storage database 20C2 of FIG. 16 in which the number of times of use of each mold in the short mold stocker t in the area A of the same mold storage unit 2 (FIG. 2) is accumulated, The mold usage count total calculating means 20G calculates the total mold usage count C ₁ (FIG. 14), C ₂ , C ₃ and C ₄ for each combination of mold groups stored in the stocker t. .

  As described above, when creating a mold layout having a length of 470 mm (FIG. 15), there are four combinations of short molds occupying a length of 70 mm as shown in FIG.

For example, in the case of the third combination (15 mm + 15 mm + 20 mm + 20 mm) shown in FIG. 14 (C), the number of uses of the mold group having ID numbers 1 to 4 (15 mm) is N ₁ to ₄ and ID numbers 5 to 8 (20 mm). If the number of times the mold group is used is N ₅ to ₈ , the total number of times the mold is used is C ₃ as shown in the figure, the total number C ₁ of the total number of times the mold is used C ₁ , C ₂ , C ₃ and C ₄ are calculated.

Then, the mold stocker selecting means 20H is Wakashi if the sum C ₁ mold usage count is determined to minimize, i.e., with respect to the first combination (FIG. 14 (A)), determined the sum C ₁ is minimized If so, the first combination is selected.

  As described above (FIG. 15), when a mold layout having a length of 470 mm is created, ID numbers 5 to 8 (20 mm) constituting the first combination (FIG. 14A) are used. One short mold in the mold group and one short mold in the mold group having ID number 13 (50 mm) (in this case, a single mold) are used.

  In this case, as described above, first, only the long metal mold having ID numbers 15 to 18 (FIG. 15) is inserted into the upper table 12 side (more specifically, the punch holder 30 side), and then the ID numbers 16 to 18 are inserted. The long mold is moved to the left (corresponding to FIG. 18 (B)) to form a gap into which the short mold is inserted, and thereafter the short mold of ID No. 5 and (FIG. 15) 13 is moved into the gap. 15 (corresponding to FIG. 18C), if the short dies with ID numbers 5 and 13 and the long dies with ID number 15 are gathered to the left (corresponding to FIG. 18D), FIG. A mold layout is created.

  The method shown in FIGS. 13 and 14 is always performed when a predetermined mold layout (FIG. 15) is created (step 107 to step 109 in FIG. 10).

  The above-mentioned example is a case where a mold layout having a length of 470 mm is created as shown in FIG. 15, and four 100 m long dies and one 20 mm and 50 mm short dies are required. Therefore, the mold stocker selection means 20H is a combination of the long mold stocker h1 (FIG. 13) and the first short mold group (for example, FIG. 14A) in which the number of times the mold is used is minimum. Both were selected.

  However, for example, when creating a mold layout having a length of 200 mm (needs two 100 mm long molds), the long mold stocker h1 (or h2, h3) having the smallest number of mold uses is used. Only) is selected.

  For example, when creating a mold layout having a length of 70 mm (for example, one short mold having a length of 20 mm and 50 mm is required), only a combination of mold groups having the smallest number of mold uses is used. (For example, FIG. 14A) is selected.

  As described above, according to the present invention of FIGS. 13 and 14, by selecting the stocker and / or the combination of the mold group with the smallest sum of the number of times the mold is used, similarly, compared with the conventional case. The number of times the mold is used is averaged (FIG. 17), and the wear state of the mold is made uniform accordingly, so that it is possible to perform bending with high accuracy.

The operation of the present invention having the above configuration will be described below with reference to FIG.
(1) Operation until processing information is determined.

  In step 101 of FIG. 10, product information is input, and in step 102, a bending order, a mold, a mold layout, a work position, and the like are determined.

  That is, when the CPU 20A detects that product information has been input via the input / output means 20B (FIG. 1), the bending order, mold, mold layout a, b, c, After determining d, workpiece position, etc., these machining information is stored as a database in the storage means 20C (FIG. 1) (FIG. 8).

(2) An operation for determining whether the method is the first method or the second method.

  In step 103 of FIG. 10, it is determined whether the method is the first method or the second method.

  That is, when the CPU 20A detects that the machining information has been determined by the machining information determination means 20D (FIG. 1), the CPU 20A will execute the first method (the mold arrangement method of FIG. 11) or the second method (FIG. 13). , It is determined whether to implement the mold stocker selection method of FIG.

  Then, the CPU 20A (FIG. 1), for example, when the operator operates the keyboard of the operation panel 20B and displays the first method or the second method on the screen, a method to be performed based on the display. Is the first method (FIG. 11) or the second method (FIGS. 13 and 14).

(3) Operation of the first method.
If it is determined in step 103 of FIG. 10 that the first method is to be performed, in step 104, the number of times the mold is used is counted along with the bending process, and in step 105, the number of times the ram 12 is driven is set to a predetermined value. If it has not reached (NO), return to step 104 and repeat the same operation. If it has reached (YES), in step 106, molds are arranged in ascending order of use. Change.

  That is, when the CPU 20A determines that the first method (FIG. 11) is to be performed (FIG. 1), the CPU 20A counts the number of times the mold is used via the detection unit 20C3 (FIG. 1) and the adder 20C4. The number of uses is accumulated in the mold storage database 20C2 (FIG. 9).

  When the CPU 20A determines that the number of times of driving of the ram 12 has reached a predetermined value via the detection unit 20C3 (FIG. 1), the CPU 20A activates the mold usage count detection means 20E and the mold rearrangement means 20F. Then, as described above (FIG. 11), the dies are rearranged in the order of decreasing number of uses.

(4) Operation of the second method.
If it is determined in step 103 of FIG. 10 that the second method is to be performed, the total number of times the mold is used is calculated in step 107, and in step 108, the stocker with the smallest total number of times the mold is used is calculated. A combination of mold groups or both are selected, a mold layout is created in step 109, and bending is performed in step 110.

That is, if the CPU 20A determines that the second method (FIGS. 13 and 14) is to be performed (FIG. 1), as described above, according to the length of the mold layout (for example, FIG. 15), through the mold using the number total sum calculation unit 20G (Fig. 1), the stocker h1, h2, the sum of the mold usage count per _{h3 S h1, S h2, S} h3 etc. calculates (13, 14), further Then, via the mold stocker selection means 20H (FIG. 1), the stocker having the smallest sum of the number of times the mold is used is selected.

  Thereafter, the CPU 20A (FIG. 1) operates the mold storage units 2 and 3 and the mold exchanging apparatuses 2A and 3A to use the molds stored in the selected stocker and the like for a predetermined length. After creating the mold layout (for example, FIG. 15), bending is performed by operating the hydraulic cylinders 14 and 15 (FIG. 1).

  INDUSTRIAL APPLICABILITY The present invention is used in a bending apparatus, a mold arrangement method, and a mold stocker selection method that perform bending with high accuracy by uniformizing the wear state of a mold. When the number of driving times reaches a predetermined value, a predetermined die layout (FIG. 15) is created in addition to a regularly arranged mold arranging method (FIG. 11) in which the dies are rearranged in ascending order of use. This method is also applied to the mold stocker selection method (FIGS. 13 and 14), which is always performed when the mold is used, and selects the stocker having the smallest sum of the number of times the mold is used. In addition to the descending press brake (FIG. 1), the ascending press brake that bends the workpiece W with the punch P and the die D as the lower table 13 that is a ram rises. The method of counting the number of times of use of the mold is not limited to the method of counting the number of times of use of each mold for actually bending the workpiece according to the present invention (FIGS. 6 to 9), As disclosed in Japanese Patent Laid-Open No. 61-99529, which has already been described, the present invention can be applied to a method of counting the number of times a mold is used in proportion to the number of ram operations, which is extremely useful.

1 is an overall view of the present invention. It is a figure which shows the arrangement | positioning state of each stocker in the metal mold | die (punch) storage part 2 which comprises this invention. It is a figure which shows the arrangement | positioning state of each stocker in the metal mold | die (die) storage part 3 which comprises this invention. It is a figure which shows stocker h1, h2, h3 for long metal mold | die by this invention. It is a figure which shows the stocker t for short molds by this invention. It is a figure which shows the example of the bending process by this invention. It is a figure which shows the relationship between the metal mold | die layout by this invention, and the bending position of a workpiece | work. It is a figure which shows the process information database 20C1 by this invention. It is a figure which shows the metal mold | die storage database 20C2 by this invention. It is a flowchart for demonstrating operation | movement of this invention. It is operation | movement explanatory drawing of 1st Embodiment by this invention. It is a figure which shows the metal mold | die storage database 20C2 after completion | finish of operation | movement of FIG. It is operation | movement explanatory drawing of an example of 2nd Embodiment by this invention. It is operation | movement explanatory drawing of the other example of 2nd Embodiment by this invention. It is a figure which shows the example of the metal mold | die layout produced by FIG. 13, FIG. It is a figure which shows the calculation and selection operation | movement by FIG. 13, FIG. It is a comparison figure of the present invention and the conventional effect. It is operation | movement explanatory drawing of a prior art. It is a subject explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bending apparatus 2, 3 Mold storage part 2A, 3A Mold exchange apparatus 5, 6 Pressure gauge 7 Foot pedal 12 Upper table 13 Lower table 14, 15 Hydraulic cylinder 16, 17 Side plate 20 NC apparatus 20A CPU
20B Input / output means 20C Storage means 20C1 Machining information database 20C2 Mold storage database 20D Machining information determination means 20E Mold usage count detection means 20F Mold rearrangement means 20G Mold usage count total calculation means 20H Mold stocker selection means 21, 22 Bracket D Die P Punch W Work t Short mold stocker h1, h2, h3 Long mold stocker

Claims (8)

In a bending apparatus having a mold storage unit that stores a pair of molds composed of a punch and a die together via a stocker, and a mold changer that exchanges the mold between the mold storage unit and the upper and lower tables ,
Mold usage count detection means for detecting the usage count of molds in each stocker;
Based on the detected number of times the mold is used, the mold storing unit and the mold exchanging device are driven and controlled, and there is provided a mold rearranging means for rearranging the molds in each stocker in a predetermined order. Bending machine. The bending apparatus according to claim 1 , wherein the mold rearranging unit drives and controls the mold storage unit and the mold exchanging device, and rearranges the molds in each stocker in ascending order of use. In a bending apparatus having a mold storage unit that stores a pair of molds composed of a punch and a die together via a stocker, and a mold changer that exchanges the mold between the mold storage unit and the upper and lower tables ,
For each stocker or for each combination of mold groups or for both, a mold usage count total calculating means for calculating the total number of mold usage counts;
A bending apparatus comprising: a mold stocker selection means for selecting a predetermined stocker, a combination of a predetermined mold group, or both based on the calculated total number of times the mold is used. 4. The mold stocker selecting means selects a stocker having a minimum sum of calculated mold uses, a combination of mold groups having a minimum sum of calculated mold uses, or both. Bending device. A mold arranging method in the bending apparatus according to claim 1,
(1) After detecting the number of times the mold is used in each stocker,
(2) A mold arrangement in which the mold storage unit and the mold changer are driven and controlled based on the detected number of times the mold is used, and the molds in each stocker are rearranged in a predetermined order. Method. In (2) above, the mold storage unit and the mold exchanging device are driven and controlled, and the molds in each stocker are rearranged in ascending order of the number of times of use. 6. The mold arrangement method according to claim 5, which is performed every time. A mold stocker selection method in the bending apparatus according to claim 3,
(1) After calculating the total number of molds used for each stocker or for each combination of mold groups or for both,
(2) A mold stocker selection method, wherein a predetermined stocker, a combination of predetermined mold groups, or both are selected based on the calculated total number of times the mold is used. In the above (2), the stocker with the smallest sum of the calculated number of times of use of the mold or the combination of the die groups with the smallest sum of the number of times of use of the calculated die or both are selected. 8. The mold stocker selection method according to claim 7, which is performed every time a layout is created.

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