JP4305907B2 - Bending apparatus and method - Google Patents

Description

  In the vibration bending for reducing the bending pressure, the present invention further reduces the bending force due to the bending reaction force of the workpiece, thereby further reducing the bending based on the bending reaction force of the workpiece and enabling higher-precision processing. The present invention relates to a bending apparatus and method for facilitating downsizing of the apparatus.

  Conventionally, there is a bending method disclosed in, for example, Japanese Patent Publication No. 4-31764. In this method, a servo valve is connected to a cylinder for driving a ram, and the servo valve is controlled to be opened and closed. By arbitrarily setting the repetition cycle, the workpiece is vibrated and the spring back is reduced.

As another bending method, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 2001-286935, and this method applies bending force by applying micro vibrations to a mold mounted on an upper table or a lower table. This makes it possible to process with high accuracy by reducing the bending.
Japanese Patent Publication 4-31764 JP 2001-286935 A

  However, the above-described conventional techniques use a vibrator provided in a cylinder for driving a ram (Japanese Patent Publication No. 4-31764) or a mold holder (Japanese Patent Laid-Open No. 2001-286935), both of which give micro vibrations to the entire mold. Bending, that is, vibration bending.

  For this reason, as shown in FIG. 14 of the present application, in the conventional vibration bending that gives minute vibrations to the entire molds P and D, vibration is applied to the entire bending line m, and bending pressure (required tonnage) ) Is proportional to the bending length L, which is the contact length between the molds P, D and the workpiece W.

  As a result, as described above, even in vibration bending for the purpose of reducing the bending pressure, the bending of the entire bending apparatus cannot be ignored in the past, and the bending angle of the workpiece W varies and affects the machining accuracy. In addition, it may be difficult to completely downsize the bending apparatus.

  The object of the present invention is to further reduce the bending based on the bending reaction force of the workpiece by virtue of the further reduction of the bending pressure in the vibration bending for reducing the bending pressure, thereby enabling more accurate machining. At the same time, miniaturization of the device is promoted.

In order to solve the above problems, the present invention provides:
As described in claim 1,
A plurality of vibrators C1 to C8 that are provided in the longitudinal direction (X-axis direction) of the ram 1 and impart vibrations to the molds P and D;
For each vibrator C1 to C8 corresponding to a position on the bend line m (FIG. 2) of the workpiece W and where local vibration bending is performed on a part of the work W, the vibration frequency generated by each vibrator C1 to C8, And vibration generation pattern determining means 24E for determining a vibration generation pattern (FIGS. 2 to 4) comprising the generation order of vibrations,
In a state where the ram 1 is lowered or raised, the plurality of vibrators C1 are provided to apply local vibration to a part of the molds P and D according to the vibration generation pattern determined by the vibration generation pattern determination means 24E. A bending device characterized by including vibrator drive control means 24G for driving and controlling the corresponding vibrator among C8 ,
And the vibration generation pattern determination means 24E automatically determines the vibration generation pattern, and in addition to the vibration generation pattern determination means 24E that automatically determines the vibration generation pattern determination means 24E The technical means of the bending apparatus according to claim 1 is provided with an input / output means 24B comprising an operation panel capable of manually determining the result on the screen and confirming the result on the screen .

According to the configuration of the present invention, for example, when the workpiece W extends over the entire length of the molds P and D (FIG. 2), the bending line m of the workpiece W depends on the processing conditions (material, plate thickness, bending length, etc.). The positions X ₁ , X ₂ ... At which the vibration bending is locally performed on a part thereof are detected, and a predetermined vibration generation pattern is determined in advance (FIG. 3). If the vibration generation pattern is stored in a database (FIG. 4), in the descending press brake (FIG. 1), the vibrator drive control means 24G searches the database (FIG. 4) while the ram 1 is descending. However, by sequentially driving and controlling the corresponding vibrators C1, C2,..., For example, the regions P4 and R5 and R3 and R6 of the punch P from the center (FIG. 2) toward the both ends.・ ・ ・ Punch so that vibration is sequentially applied to Local vibration is applied to a part of, accordingly, bending local vibration of the workpiece W is carried out (FIG. 11).

For this reason, the bending pressure applied to the workpiece W is further reduced as compared with the prior art, and accordingly, the bending reaction forces f ₄ and f ₅ and f ₃ and f ₆ from the workpiece W (FIG. 11) with respect to each bending pressure. .. Is further reduced in the same manner, for example, the bending of the bending apparatus constituted by a descending press brake (FIG. 1) is further reduced.

  Therefore, according to the present invention, in vibration bending for reducing the bending pressure, the bending force can be further reduced to further reduce the bending based on the bending reaction force of the workpiece, thereby enabling more accurate machining. In addition, downsizing of the apparatus can be promoted.

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

  The bending apparatus shown in FIG. 1 is a descending press brake having an upper table 1 as a ram, for example.

  As is well known, this press brake has side plates 30 on both sides of the machine body, and has an upper table 1 and a lower table 2 attached to the upper and lower sides of the side plate 30.

  The upper and lower tables 1 and 2 are mounted with a punch P and a die D constituting a mold, and a part of the workpiece W is locally localized by cooperation of the punch P and the die D and vibrators C1 to C8 described later. Vibration bending.

  In this case, the ram 1 has a drive source 3 as shown, and examples of the drive source 3 include a hydraulic cylinder and a servo motor.

  The ram drive source 3 lowers the ram 1 (step 104 in FIG. 13), for example, and after the pinching point where the punch P contacts the workpiece W (YES in step 105 in FIG. 13), the ram 1 (FIG. 1). While continuing to descend, the workpiece W is subjected to local vibration bending in cooperation with vibrators C1 to C8 described later (step 106 in FIG. 13).

  Further, the vibrators C1 to C8 are provided between the ram 1 and the punch P (FIG. 1), and the vibrators C1 to C8 include, for example, an ultrasonic vibrator, a hydraulic chamber, a servo valve, and the like. Vibration (microvibration) is generated (for example, Japanese Patent Publication No. 4-31764). In this case, the vibrators C1 to C8 can be provided between the lower table 2 and the die D.

  As will be described later (for example, FIG. 4), the vibrators C <b> 1 to C <b> 8 generate vibrations each having a unique frequency in a predetermined order and apply local vibrations to a part of the punch P (FIG. 1).

  In this case, the frequency of the vibrations generated by the vibrators C1 to C8 is determined based on the vibration generation pattern determined in advance. There are an automatic determination method by means 24E (FIG. 1) and a manual determination method in which an operator manually inputs and determines on the screen of the input / output means 24B (operation panel).

(1) Automatic determination method.
(1) -A 1st Example (FIGS. 2-4).
As shown in FIG. 2, the first embodiment is a case of local vibration bending of the workpiece W extending over the entire length of the molds P and D.

In this case, vibration bending is locally performed on a part of the bending line m of the workpiece W according to the processing conditions including the material, thickness, bending length, etc. of the workpiece W in the case of FIG. If the positions X ₁ , X ₂ ... Are known, regions R 1, R 2. In addition, the vibrators C1, C2,...

  Accordingly, the vibration generation pattern determining means 24E (FIG. 1) is provided with vibrators C1 and C2 for applying local vibration to the punch P according to processing conditions based on product information input via an input / output means 24B described later. .. Are selected, and the frequency and generation order of the vibrations generated by the selected vibrators C1, C2,.

  For example, regarding the generation order, as shown in FIG. 3, the vibrators C4 and C5 first generate vibrations (FIG. 3A), and the second, the vibrators C3 and C6 generate vibrations. 3 (FIG. 3B), thirdly, the vibrators C2 and C7 generate vibrations (FIG. 3C), and fourth, the vibrators C1 and C8 generate vibrations (FIG. 3). (D)) and the like are repeated.

The order of occurrence (FIG. 3 (A) ~ FIG 3 (D)), region R1 of the upper punch P shown in FIG. 2, R2 · · · a position X ₁ of the bending line m of the workpiece W, X ₂ · · As shown in FIG. 3A, vibrations are applied to the regions R4 and R5, R3 and R6,... On the punch P according to FIGS. Then, local vibration bending is performed at positions X ₄ and X ₅ , X ₃ and X ₆ ... On the bending line m of the workpiece W (FIG. 11).

  That is, the vibrators C4 and C5, C3 and C6,... Generate vibration along the longitudinal direction (X-axis direction) of the upper table 1 (FIG. 2) from the center to both ends. Accordingly, vibrations are applied to the regions R4 and R5, R3 and R6... On the punch P correspondingly, and accordingly, local vibration bending is performed from the center portion of the workpiece W toward both ends (FIG. 11). ).

  The order of occurrence of this vibration may be reversed, and the vibration may be directed from both ends of the upper table 1 (FIG. 2) toward the center.

  Further, the vibration frequency of each vibrator generated in this order can be similarly determined based on the processing conditions, and can be determined relatively large according to the respective processing conditions. It can also be determined small.

  The vibration frequency and the vibration generation order are determined by the vibration generation pattern determining means 24E as described above (step 103 in FIG. 13). After the determination, for example, the database is stored as shown in FIG. This is stored in the means 24C.

  In FIG. 4, ON is a case where vibration is generated, and OFF is a case where vibration is not generated. The generation order configured by ON and OFF corresponds to the generation order of FIG. 3. ing.

  As can be seen from FIG. 4, the period, which is the duration of vibration, can also be automatically determined by the vibration generation pattern determining means 24E (FIG. 1).

(1) -B 2nd Example (FIGS. 5-9).
As shown in FIG. 5, the second embodiment is a case of local vibration bending when performing step bending while moving the workpiece W from the first processing station ST1 to the second processing station ST2 (for example, the first embodiment). The long side bending of the workpiece W is performed at the processing station ST1, and the short side bending of the same workpiece W is performed at the second processing station ST2.

  In this case, vibration generation patterns are determined for each of the first processing station ST1 and the second processing station ST2.

That is, similarly, depending on the processing conditions of the workpiece W in the case of FIG. 5, the bending bending is locally performed on a part of the bending line m1 on the long side and the bending line m2 on the short side of the work W. If the positions X ₁ , X ₂ ... Where the vibration is performed are known, the regions R 1, R 2,. , And also the vibrators C1, C2,... That generate such vibrations.

  Accordingly, the vibration generation pattern determining means 24E (FIG. 1) similarly applies the processing conditions for the first processing station ST1 and the second processing station ST2 described above based on the product information input via the input / output means 24B. Accordingly, the vibrators C1, C2,... That give the local vibration to the punch P are selected, and the vibration frequency and the generation order of the vibrations generated by the selected vibrators C1, C2,.

(1) -B-A In the case of the first processing station ST1.
For example, regarding the generation order, as shown in FIG. 6, firstly, the vibrators C2 and C3 generate vibrations (FIG. 6A), and secondly, the vibrators C1 and C4 generate vibrations. As shown in FIG. 6B, such an operation is repeated.

Similarly, the generation order (FIG. 6A to FIG. 6B) is changed from the region R1, R2... On the punch P shown in FIG. ₁ , X ₂ ..., Vibrations are applied to the regions R 2 and R 3 and R 1 and R 4 on the punch P according to FIGS. Is transmitted to the workpiece W, and local vibration bending is performed at positions X ₂ and X ₃ , and X ₁ and X ₄ on the bending line m1 of the long side of the workpiece W.

  That is, in the case of the first processing station ST1, along the longitudinal direction (X-axis direction) of the upper table 1 (FIG. 5) that is a ram, from the center of the first processing station ST1 toward both ends, If the vibrators C2 and C3 and C1 and C4 generate vibrations, vibrations are applied to the regions R2 and R3 and R1 and R4 on the punch P correspondingly. Local vibration bending is performed toward the head (corresponding to FIG. 11).

  Similarly, the generation order of the vibrations may be reversed, and may be directed from the both end portions (FIG. 5) of the first processing station ST1 toward the central portion.

  Further, the vibration generation pattern determining means 24E (FIG. 1) also determines the vibration frequency of each vibrator generated in this order, and also the period which is the duration of vibration, according to the processing conditions. (Step 103 in FIG. 13) After the determination, for example, as shown in FIG. 7, it is stored in the storage unit 24C as a database together with the vibration generation order described above.

(1) -BB In the case of the second processing station ST2.
For example, as to the generation order, as shown in FIG. 8, firstly, the vibrator C7 generates vibration (FIG. 8A), and secondly, the vibrator C8 generates vibration (FIG. 8). (B)) and the like are repeated.

The order of occurrence (FIG. 8 (A) ~ FIG 8 (B)), similarly, the position X ₇ on bend line m2 of the short sides of the regions R7, R8 and workpiece W on the punch P shown in FIG. 5, X as can be made to correspond to _8, according to FIG. 8 (a) ~ FIG 8 (B), the vibration in the region R7 and R8 on the punch P is applied, the vibration is transmitted to the workpiece W, the workpiece W The local vibration bending is performed at the positions X ₇ and X ₈ on the bending line m2 of the short side.

  That is, in the case of the second processing station ST2, the vibration is generated from the left side to the right side of the second processing station ST2 along the longitudinal direction (X-axis direction) (FIG. 5) of the upper table 1 that is a ram. If the sub-elements C7 and C8 generate vibrations, vibrations are applied to the regions R7 and R8 on the punch P correspondingly, so that the workpiece W is also subjected to local vibration bending from the left side to the right side.

  The generation order of this vibration may be reversed, and may be directed from the right side to the left side of the second processing station ST2.

  Further, the vibration generation pattern determining means 24E (FIG. 1) also determines the vibration frequency of each vibrator generated in this order, and also the period which is the duration of vibration, according to the processing conditions. (Step 103 in FIG. 13), after the determination, for example, as shown in FIG. 9, the database is stored in the storage unit 24C together with the vibration generation order described above.

(2) Manual determination method.
In this case, the operator calls the “vibration generation pattern determination mode” on the screen of the input / output means 24B (operation panel) shown in FIG. If the vibration generation pattern in this case is determined manually, the result is as shown in FIG.

  In FIG. 10, the generation order corresponds to that in FIG. 3, where “1” indicates that the vibrators C4 and C5 vibrate first (FIG. 3A), and “2” indicates the vibrator. C3 and C6 generate the second vibration (FIG. 3B), “3” causes the vibrators C2 and C7 to generate the third vibration (FIG. 3C), and “4” Each of the vibrators C1 and C8 generates the fourth vibration (FIG. 3D).

  On the other hand, when the bending apparatus shown in FIG. 1 is an ascending press brake using the lower table 2 as a ram, the lower table 2 has the drive source 3 described above, and between the lower table 2 and the die D. In addition, the vibrators C1 to C8 are provided.

  Further, a back gauge having an abutment 5 is provided behind the lower table 2 (FIG. 1). The abutment 5 is attached to an abutment body 26, and the abutment body 26 is attached on a stretch 25. Before the local vibration bending (FIG. 11), the workpiece W is abutted against the abutment 5 (FIG. 1) and positioned.

  Further, a linear scale 4 is provided in the vicinity of the upper table 1, and the position of the upper table 1 is detected via the linear scale 4. For example, the descending ram 1 (step 104 in FIG. 13) is used as a pinching point. It is determined whether or not it has been reached (step 105 in FIG. 13) or whether or not the D value has been reached (step 107 in FIG. 13).

  The press brake NC device 24 having such a configuration (FIG. 1) includes a CPU 24A, an input / output means 24B, a storage means 24C, a bending order / mold determining means 24D, and a vibration generation pattern determining means 24E. The ram drive control means 24F and the vibrator drive control means 24G.

  The CPU 24A comprehensively controls the entire apparatus shown in FIG. 1, such as the bending order / mold determining means 24D, the vibration generation pattern determining means 24E, etc., according to an operation procedure (for example, corresponding to FIG. 13) for carrying out the present invention.

  The input / output means 24B is, for example, an operation panel (not shown) provided on the upper table 1, and includes input means such as a keyboard and output means such as a liquid crystal screen, and product information of the workpiece W to be processed. For example, CAD information is input, and the result can be confirmed on the screen.

  In this case, the CAD information is composed of a workpiece bending angle, bending length, plate thickness, material, flange height, and the like, as well as a development view and a three-dimensional view of the workpiece.

  The storage unit 24C stores in advance, for example, the previously described vibration generation patterns (FIGS. 4, 7, and 9), dies used for each bending order, D values, and the like in a database.

  As a result, when the ram drive control unit 24G and the vibrator drive control unit 24G operate respectively (for example, whether or not a predetermined D value has been reached (step 107 in FIG. 13) or local vibration bending, a predetermined occurrence occurs. When the transducers are operated according to the order (for example, FIG. 4 (step 106 in FIG. 13)), this database can be searched.

  The bending order / mold determining means 24D (FIG. 1) determines the mold, D value, etc. used for each bending order based on the product information input via the input / output means 24B.

  As described above, the determined information is made into a database and stored in advance in the storage means 24C. For example, the ram drive control means 24F (FIG. 1) performs local vibration bending of the workpiece W (FIG. 11). ), A criterion for determining whether or not the ram 1 has reached a predetermined D value (FIG. 12) (FIG. 1).

  The vibration generation pattern determination means 24E (FIG. 1) determines the vibration generation pattern according to the processing conditions based on the product information input via the input / output means 24B, and generates this vibration. The patterns are stored in the storage unit 24C in advance as a database (FIGS. 4, 7, and 9).

  The ram drive control means 24F (FIG. 1), after the bending order / die determination means 24D and vibration generation pattern determination means 24E determine the mold, D value, etc., and vibration generation pattern for each bending order. (Step 102 to Step 103 in FIG. 13), when the operator places the workpiece W on the die, abuts against the abutment 5 (FIG. 1), and depresses the foot pedal (not shown), the ram drive Source 3 is activated.

  Thus, for example, in the case of a descending press brake (FIG. 1), the ram that is the upper table 1 is lowered (step 104 in FIG. 13), the punch P contacts the workpiece W, and the ram 1 reaches the pinching point. At that time (YES in step 105 in FIG. 13), the ram 1 continues to descend, so that local vibration is applied by the vibrators C1 to C8 via the vibrator drive control means 24G (FIG. 1). In cooperation with the punch P, local vibration bending is performed on the workpiece W (step 106 in FIGS. 11 and 13).

  The vibrator drive control means 24G (FIG. 1), as described above, when the punch P contacts the workpiece W and the ram 1 reaches the pinching point (YES in step 105 in FIG. 13), C1 to C8 are operated according to a predetermined vibration generation pattern (FIGS. 4, 7, and 9), vibration is applied to the corresponding regions R1 to R8 on the punch P, and local vibration bending of the workpiece W is performed (FIG. 11). , Step 106 in FIG.

The operation of the present invention having the above configuration will be described below with reference to FIG.
(1) Operations up to determining a vibration generation pattern such as a die and a D value for each bending order.

  In step 101 of FIG. 13, product information is input, in step 102, a die, a D value, etc. are determined for each bending order, and in step 103, a vibration generation pattern is determined.

  In other words, when product information is input via the input / output means 24B (FIG. 1), the CPU 24A controls the bending order / mold determining means 24D and the vibration generation pattern determining means 24E to control the gold for each bending order. The type, the D value, and the vibration generation pattern are determined.

  Thereafter, the CPU 24A controls the storage unit 24C to store them in advance as a database based on the determined various information (FIGS. 4, 7, and 9).

(2) Local vibration bending operation.
In step 104 of FIG. 13, the ram 1 is lowered. In step 105, it is determined whether or not it is a pinching point. If the predetermined D value is reached, the processing is terminated in step 108.

  That is, in step 102 to step 103, the CPU 24A that has detected that the mold for each bending order, the D value, etc., and the vibration generation patterns have been determined and made into a database (for example, FIG. 4) (FIG. 1). When the ram 1 is lowered through the ram drive control means 24G and the punch P is in contact with the workpiece W and it is detected that the pinching point has been reached, the ram 1 continues to descend and the vibrator drive control means The predetermined vibrators C4 and C5 are actuated through 24G (FIG. 4).

  Thereby, as described above, vibrations having a predetermined frequency are generated from the predetermined vibrators C4 and C5 in accordance with a predetermined order, and local vibration is applied to a part of the punch P (FIG. 11). As a result, the vibration is transmitted from, for example, the center portion of the workpiece W to both end portions, whereby the local vibration bending of the workpiece W is performed.

  During the local vibration bending of the workpiece W (FIG. 1), for example, when the CPU 24A detects that the ram 1 has reached a predetermined D value (FIG. 12) via the linear scale 4, the processing is considered to be finished. Hesitate to stop all operations.

Thus, according to the present invention, while the ram 1 (FIG. 1) is lowered, for example, the vibrator is applied with local vibration to a part of the mold P, and the workpiece W is subjected to local vibration bending (see FIG. 11) Thereby, the bending pressure applied to the workpiece W is further reduced as compared with the conventional one, and the bending reaction force f ₄ and f ₅ from the workpiece W against each bending pressure, f ₃ and f _6. Is further reduced, for example, the bending of a bending apparatus composed of a descending press brake is further reduced.

  As described above, the present invention can further reduce the bending based on the bending reaction force of the workpiece and reduce the bending force in vibration bending to reduce the bending force, enabling more accurate machining. In addition, the present invention can be used for a bending apparatus and a method for promoting the downsizing of the apparatus. Specifically, the apparatus can be used not only for a lowering press brake but also for a lifting press brake.

1 is an overall view showing an embodiment of the present invention. It is a figure which shows 1st Example of the local vibration bending by this invention. It is the schematic of the vibration generation pattern of FIG. It is a figure which shows the database of FIG. It is a figure which shows 2nd Example of the local vibration bending by this invention (step bend process). It is the schematic of the vibration generation pattern in 1st process station ST1 of FIG. It is a figure which shows the database of FIG. It is the schematic of the vibration generation pattern in 2nd process station ST2 of FIG. It is a figure which shows the database of FIG. It is a figure which shows the manual determination system of the vibration generation pattern by this invention. It is a figure which shows the relationship between the generation order of the local vibration and bending reaction force by this invention. It is a figure which shows the relationship between the workpiece | work W of FIG. It is a flowchart for demonstrating operation | movement of this invention. It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper table 2 Lower table 3 Drive source of ram 1 C1-C8 Vibrator 5 Abutting 6 Linear scale 24 NC device 24A CPU
24B Input / output means 24C Storage means 24D Bending order / mold determination means 24E Vibration generation pattern determination means 24F Ram drive control means 24G Vibrator drive control means 25 Stretch 26 Abutment body 30 Side plate D Die P Punch W Workpiece

Claims (2)

A plurality of vibrators provided in the longitudinal direction of the ram and imparting vibrations to the mold;
For each transducer corresponding to a position on the workpiece bend line and where local vibration bending is performed on a part of the workpiece, a vibration generation pattern including the frequency of vibration generated by each transducer and the sequence of vibration generation is determined. Vibration generation pattern determination means;
In a state where the ram is descending or rising, according to the vibration generation pattern determined by the vibration generation pattern determination means , the corresponding vibration of the plurality of vibrators is applied to apply a local vibration to a part of the mold. A bending apparatus comprising vibrator drive control means for driving and controlling a child. The vibration generation pattern determining means automatically determines the vibration generation pattern, and in addition to the vibration generation pattern determination means for automatically determining, the operator himself / herself manually determines the vibration generation pattern on the screen, and the result is obtained. 2. A bending apparatus according to claim 1, further comprising an input / output means comprising an operation panel that can be confirmed on a screen .

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