JP4232268B2 - Plate processing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate material processing machine such as a punch press, a shearing machine, and a laser processing machine.
[0002]
[Prior art]
In a plate material processing machine such as a punch press, as shown in FIG. 8, the plate material W is fed on a table 81 to a processing position P such as a punch position. This feeding is performed by the movement of the work holder 82 that holds the end of the plate W. A free bearing 83 is installed on the table 81 in order to smoothly feed the plate material. A height at which the plate material W is supported by the free bearing 83 becomes a plate material pass line L. In the case of a punch press, the plate material pass line L is a die height.
In such a plate material processing machine, the level of gripping of the plate material W by the work holder 82 is set higher than the plate material pass line L so that the work holder 82 does not interfere with the free bearing 83 as it moves.
[0003]
[Problems to be solved by the invention]
When the plate material is gripped by the work holder 82 at a position higher than the pass line L in this way, the plate material W on the table 81 is inclined in the vicinity of the work holder 82. Since the plate material inclined portion Wa is relatively close to the work holder 82, there is not much problem when machining a portion of the plate material W away from the work holder 82. However, as shown in the figure, when processing the vicinity of the grip position of the plate material W by the work holder 82, the plate material inclined portion Wa comes to the processing position P, and the plate material inclined portion Wa is processed. . In the case of punching, the plate material inclined portion Wa, which has been inclined as shown by the chain line in the figure, is processed after being pressed to the upper surface of the die 85 by the punch 84, as shown by the solid line in the figure. Become. For this reason, a deteriorated portion such as a dent is generated in the plate material W, and high quality processing cannot be performed.
Further, when the work holder 82 is close to the processing position P, the inclination angle θ of the plate material inclined portion Wa is increased, so that the length along the inclination that is the actual length of the plate material inclined portion Wa and the position of the work holder 82 are determined. The difference from a certain horizontal distance increases, and the processing error increases.
[0004]
If the free bearing 83 can be moved up and down, or a brush or the like is used in place of the free bearing 83 so that the gripping height by the work holder 82 coincides with the pass line L, the plate material will not be inclined, and the hitting will not occur. It is possible to prevent the generation of traces and deterioration of accuracy. However, in this case, since the work holder moves while rubbing against the free bearing and the brush, it is necessary to move the work holder at a low speed in order to avoid damage to the free bearing and the brush.
[0005]
An object of the present invention is to provide a plate material processing machine capable of performing high quality and high precision processing without causing dents and the like, and capable of high speed sheet feed even when the plate material is fed by a work holder at a position higher than the pass line. Is to provide.
[0006]
[Means for Solving the Problems]
The configuration of the present invention will be described with reference to FIG. 1 corresponding to the embodiment. The plate material processing machine according to claim 1, wherein a plurality of plate material supporting means (16) on which the plate material (W) is placed protrudes on the upper surface, and the plate material (W) on the work table (2) is processed. A processing part (3) for carrying out the process, a work holder (4) for gripping the end part of the plate material, a plate material feeding means (5) for feeding the plate material (3) to the processing part (3), and the work holder A holder height changing mechanism (19) for changing the vertical position of (4) and a work holder elevation control means (29) for controlling the holder height changing mechanism (19) are provided. The work holder lifting / lowering control means (29) controls the work holder (4) so as to be in the raised position when feeding the plate material and in the lowered position when machining.
The plate material processing machine having this configuration grips the plate material (W) placed on the plate material support means (16) of the work table (2) by the work holder (4) and moves it relative to the processing unit (3). The arbitrary part of the plate material (W) is processed by the processing part (3). At this time, the work holder (4) is set to the raised position when the plate material is fed by the control of the holder height changing mechanism (19) by the work holder lifting / lowering control means (29). Therefore, the work holder (4) does not interfere with the plate material support means (16), and the feeding of the plate material (W) can be speeded up. Further, when machining, the work holder (4) is in the lowered position. For this reason, the plate material (W) is not processed while being inclined by the lifting by the work holder (4), and the processing is always performed in a horizontal posture. Therefore, a dent etc. do not generate | occur | produce in a board | plate material (W), but it can process neatly. Moreover, processing can be performed with high accuracy.
[0007]
The work holder lifting / lowering control means (29) places the work holder (4) in the lowered position when performing the processing because the work holder (4) is in the vicinity region (R) of the processing portion (3). only a case of performing, when the workpiece holder (4) is not in the area near the processing unit (3) (R) shall be the ones that no lowered when performing processing. In the vicinity region (R) of the processed part (3), the work holder (4) in the raised position is the plate material (W) in the movement region of the work holder (4) moved by the plate material feeding means (5). Is a region in which the inclined portion (Wa) of the plate (W) generated in the vicinity of the work holder (4) by the lifting is positioned in the processed portion (3).
When comprised in this way, when a work holder (4) exists in the vicinity of a process part (3) and a process is performed, a work holder (4) will be in a lowered position, and the board | plate material (W) will be in the state without the inclination. Processed. When the work holder (4) is far from the processing part (3), the work holder (4) is processed while being lifted, but the plate (W) is inclined by lifting the work holder (4). Since this occurs near the work holder (4), the plate (W) is in a horizontal state in the vicinity of the processed part (3). Therefore, in any case, the horizontal portion of the plate material (W) is processed by the processing portion (3), and therefore the plate material (W) is processed cleanly without any dents or the like. be able to. Further, since the workpiece holder (4) is not lowered when it is far from the machining portion (3), the descent time and the rising recovery time can be omitted, and the machining cycle time can be shortened. Furthermore, since the work holder (4) is lowered only in the vicinity area (R) of the processing part (3) and is in the raised position in the other areas, the work holder (4) is in the plate material supporting means ( 16), there is no problem even if the plate member supporting means (16) is fixed.
[0008]
In the present invention, when the work holder (4) is in the vicinity region (R) of the machining portion (3) and is configured to move down the work holder (4) as described above, the plate material feeding means (5) A correction means (26) for correcting the change in the horizontal length of the plate material (W) caused by the plate material (W) being lifted by the work holder (4) in the raised position to form an inclined portion. 27) may be provided. This correction is selectively performed depending on whether or not the work holder (4) is in the region (R) where the work holder (4) is lowered. That is, correction is performed when the work holder (4) is in the descending region (R), and correction is not performed when the work holder (4) is outside the descending region (R), or conversely, the work holder (4) there uncorrected when in the descending region (R), you be corrected when descending region (R) of the outer. The plate material feeding means (5) grasps the plate material end in the first axial direction (Y) of the orthogonal biaxial directions (X, Y) with the work holder (4) to hold the plate material (W). The correction means (27) moves the change in the horizontal length of the plate material with respect to the stop position in the first axial direction (Y). It is to correct.
When switching Wa Kuhoruda (4) into a raised position and a lowered position, the distance between the processing center of the processing portion workpiece holder (4) (3) is changed by the vertical movement. Therefore, by correcting the stop position of the work holder (4) by the amount that the distance changes, it is possible to perform highly accurate machining.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. 2 and 3 are a cut-away plan view and a side view of the plate material processing machine. This plate material processing machine includes a work table 2 on a frame 1, a processing unit 3 for processing a plate material W on the work table 2, and a plate material feeding means 5 for gripping and moving an end portion of the plate material W by a work holder 4. Is provided. This plate material processing machine is a turret type punch press, and upper and lower turrets 6 and 7 each holding a punch die 41 (FIG. 1) and a die die 42 are installed concentrically on the frame 1. The The processing unit 3 includes a punch driving mechanism that hits the punch die 41 of the upper turret 7 at the processing position P.
[0010]
The work table 2 includes a plurality of divided tables 2 a and 2 b, and some of the divided tables 2 b are turret peripheral tables positioned around the lower turret 7. The plate material feeding means 5 has a cross slide 11 installed on a carriage 10 which can be moved back and forth and movable in the left and right (X-axis) directions orthogonal to the carriage 10, and a plurality of work holders 4 arranged in parallel on the cross slide 11. is there. The carriage 10 moves on a rail 9 provided on the bed 8. The carriage 10 has a portion located above the work table 2 and a portion located below, and the upper and lower portions are connecting members (not shown) that pass through the gap between the divided tables 2a and 2a. ) Are connected to each other. The carriage 10 and the cross slide 11 are moved forward and backward by the servo motors 12 and 13 via the ball screw mechanisms 14 and 15, respectively.
[0011]
On the work table 2, a free bearing 16 and a brush 17 each serving as a plate material supporting means are provided. A plurality of the free bearings 16 are arranged in a region excluding the vicinity of the processing unit 3 and the brush 17 is arranged in a region R in the vicinity of the processing unit 3. Specifically, the brush 17 is provided in the peripheral portion of the lower turret 7 (for example, the entire turret peripheral table 2 b), and the free bearings 16 are distributed throughout the remaining portion on the work table 2. The brush 17 is also provided on the turret upper table 2 c (FIG. 1) installed on the upper surface of the lower turret 7. The free bearing 16 is fixedly installed, and the work holder 4 cannot pass in the interference state. The brush 17 is provided so that the work holder 4 can pass even in an interference state. Instead of the brush 17, an appropriate plate material support means such as an elastic body that can pass even when the work holder 4 is in an interference state may be provided.
[0012]
The work holder 4 grips the end portion of the plate material W with the tip at the top and bottom, and as shown in FIG. The position is changed to the upper and lower positions by the change mechanism 19. The guide 18 includes a guide pin 18 a provided on the cross slide 11 on both sides of the work holder 4 and a guide cylinder 18 b provided on the work holder 4 and fitted to the guide pin 18 a. The holder height changing mechanism 19 includes a spring member 19a that supports the work holder 4 in the raised state with respect to the cross slide 11, and a cylinder device 19b that pushes down the work holder 4 against the spring member 19a. The cylinder device 19 b is installed on the cross slide 11 and pushes down the engaging protrusion 19 c provided on the work holder 4.
[0013]
The control system will be described with reference to FIG. The control device 21 is means for controlling the entire plate material processing machine according to the processing program 22, and includes a computer type numerical control unit 23 and a sequence control unit 24. The numerical control unit 23 includes a main control unit 25 and a feed control means 26. The main control unit 25 is a unit that decodes the machining program 22 and causes the feed control unit 26 to execute a feed command in the machining program 22 and transfers a command related to sequence control to the sequence control unit 24. The feed control means 26 is means for controlling the feed of the Y-axis and X-axis servomotors 12 and 13, and has a correction means 27. The correction unit 27 is a unit that corrects the Y-axis feed amount, and the details of the correction will be described later.
The sequence control unit 24 is configured by a programmable controller or the like. The sequence control unit 24 is provided with a machining command means 28 and a work holder lifting / lowering control means 29. The machining command unit 28 is a unit that gives a machining command such as punch driving to the machining unit 3. The work holder lifting / lowering control means 29 is a means for giving a lifting / lowering command to the holder height changing mechanism 19.
[0014]
The work holder raising / lowering control means 29 sets the work holder 4 to the lowered position when the workpiece holder 4 is in the vicinity region R of the machining portion 3 and performs machining, and returns to the raised position when predetermined machining is completed. When the work holder 4 is not in the vicinity region R of the processing part 3, the lowering of the work holder 4 is not commanded. The vicinity region R of the processing unit 3 is a region that is appropriately set as a work holder lowering area. In this embodiment, the workpiece holder lifting / lowering control means 29 determines whether or not the workpiece holder 4 is in the vicinity region R of the machining unit 3 from the command of the machining program 22. It is also possible to make a judgment from an encoder, for example, an encoder 13a provided in the Y-axis servomotor 13 or the like. Specifically, the work holder lifting / lowering control means 29 performs steps S1, S2, S7, and S9 of FIG.
[0015]
The correction means 27 is a means for correcting the stop position commanded by the machining program 22 when the feed control means 26 moves the work holder 4 in the Y-axis direction, that is, moves the carriage 10. The correction amount is, for example, a change Δm (for example, Δm = m′−m) of the horizontal length of the plate due to the inclined portion Wa (FIG. 5A) generated when the plate W is lifted by the work holder 4 in the raised position. ). This correction is performed when the work holder 4 is in a region R in which the work holder 4 is lowered (a region in the vicinity of the processing unit 3) R. If the work holder 4 is outside this region, the correction is not performed. Specifically, the correcting unit 27 performs the processes of S1, S2, and S5 in the flowchart of FIG.
[0016]
The operation of the above configuration will be described. The end of the plate material W on the table 2 is gripped by the work holder 4, and an arbitrary portion of the processed portion 3 is moved by the carriage 10 moving back and forth (Y-axis direction) and the cross slider 11 moving left and right (X-axis direction). It is sent to the processing position P. After this feeding, processing such as punching is performed on the plate material W in the processing unit 3. When one punching process is completed, the plate material is fed for the next process. In the process of feeding and processing the plate material, the work holder 4 is normally in the raised position and moves without interfering with the free bearing 16.
[0017]
FIG. 6 shows processing for raising and lowering the work holder 4 and feeding position correction by the control device 21. When the feed control means 26 reads the Y-axis feed command in the machining program 22 (S1), the correction means 27 determines whether or not the Y-axis coordinate is in the work holder lowering area (near area of the machining part 3) R. (S2).
If it is not within the work holder lowering area R, the Y-coordinate positioning is executed by the feed control means 26 as it is (S3), and processing such as punching and cutting is performed (S4). At this time, the work holder 4 remains in the raised position as shown in FIG. 5A, but the inclined portion Wa of the plate material W due to the lifting of the work holder 4 is away from the processing portion 3, so that processing such as dents is performed. The problem of defective parts does not occur. When the processing is completed, the operation proceeds to the next processing.
If it is within the work holder lowering area R in the determination step S2, the Y coordinate is corrected by the correction means 27 (S5), and positioning is executed with the corrected coordinate (S6). After positioning, the workpiece holder 4 is lowered by a command from the workpiece holder lifting / lowering control means 29 (FIG. 5B), and processing such as punching and cutting is performed in this lowered state (S8). Thus, since the work holder 4 is moved down to perform processing, the plate material W can be processed in a horizontal state, and processing defects such as dents are not generated, and processing is performed with high quality. In the work holder lowering area R, the plate material supporting means is provided as the brush 17, and therefore does not hinder the lowering of the work holder 4. When one unit of machining such as one punch is completed, the work holder 4 is raised (S9), and the operation for the next machining is started.
[0018]
In the correction of the Y coordinate (S5), the correction is performed using the difference Δm (= m′−m) between the actual length m ′ of the plate material inclined portion Wa caused by lifting the work holder 4 and the horizontal length m as a correction amount. Done. In order to perform the correction in this way, in one plate W, the part where the work holder 4 is processed at the raised position as shown in FIG. 5A and the work holder 4 as shown in FIG. Even if there is a mixture of parts to be processed at the lowered position, an error in the Y-axis direction does not occur between the two parts, or is mitigated.
When the work holder 4 is outside the work holder lowering area R, the machining is always performed in a state where an error of the difference Δm is generated in the Y coordinate. This error does not occur. When entering the work holder lowering area R, correction that positively generates the same error as described above is performed, so that no error occurs between the entire processed parts of the plate material W.
The inclination angle and length of the plate material inclined portion Wa change depending on the material, plate thickness, size, etc. of the plate material W, and the above difference Δm also changes accordingly. From this, it may be determined by calculation. Further, if the material, plate thickness, size, etc. are determined to some extent, a constant correction amount may always be used.
[0019]
FIG. 7 is an embodiment in which the correction by the correction means 27 in the embodiment of FIG. That is, in this example, correction is performed when the work holder 4 is not within the work holder lowering area R (R2, R3), and when it is within the work holder lowering area R, positioning is performed without correction (R6). Then, the work holder 4 is lowered (R7), machining is performed (R8), the work holder 4 is raised and returned (R9), and the operation for the next machining is started.
Also in this case, even if a part where machining is performed in the raised state of the work holder 4 and a part where machining is performed in the lowered state are mixed, no error in the Y-axis direction occurs between the two parts, or Alleviated.
[0020]
In each of the above-described embodiments, the case where the workpiece holder 4 is lowered or not caused during machining is generated depending on the position of the workpiece holder 4 in the Y-axis direction. However, the workpiece holder 4 is always in the raised position when feeding the plate material. Control may be performed by the work holder lifting / lowering control means 29 so as to always be in the lowered position. Thus, when always lowering the work holder 4 during processing, the correcting means 27 is unnecessary. However, the plate material supporting means provided on the table 2 needs to allow the work holder 4 to be lowered at an arbitrary position. The plate material supporting means on the entire surface of the work table 2 can be bent by a brush or the like. It is necessary to be able to move up and down using a bearing 16 or the like.
[0021]
【The invention's effect】
The plate material processing machine according to the present invention is provided with the work holder elevating control means for controlling the work holder to be in the ascending position when feeding the plate material, and to be in the lowered position when performing processing. Even if feeding is performed at a position higher than the pass line, high-quality and high-precision machining can be performed without causing dents and the plate material can be fed at high speed.
For the work holder lifting control means, the work holder is set to the lowered position only when the work holder is in the region near the machining part and machining is performed, and when the work holder is not in the region near the machining part, also because of the not lowered, while allowing high-quality machining causing no such dents, eliminates lifting frequent work holder, also can be shortened machining cycle time it becomes capable of high-speed feed.
Further, when a correction means for correcting a change in the horizontal length due to the inclination of the plate material is provided, and this correction is made to function selectively depending on whether or not it is within the descending region of the work holder, High-precision machining can be performed without error associated with the vertical position change.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a conceptual configuration of a plate material processing machine according to an embodiment of the present invention.
FIG. 2 is a broken plan view of the plate material processing machine.
FIG. 3 is a side view of the plate material processing machine.
FIG. 4 is an enlarged side view of the work holder and its holder height changing mechanism.
FIG. 5 is an operation explanatory diagram.
FIG. 6 is a flowchart showing lifting control and correction processing of the work holder.
FIG. 7 is a flowchart showing work holder lifting control and correction processing in another embodiment.
FIG. 8 is an explanatory diagram of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Frame 2 ... Work table 3 ... Processing part 4 ... Work holder 5 ... Plate material feeding means 6, 7 ... Turret 10 ... Carriage 11 ... Cross slide 16 ... Free bearing (plate material support means)
17 ... Brush (plate material support means)
18 ... Guide 19 ... Holder height changing mechanism 21 ... Control device 22 ... Machining program 26 ... Feed control means 27 ... Correction means 29 ... Work holder lifting / lowering command means 41 ... Punch 42 ... Die P ... Machining position R ... Near the machining section Region W ... Plate material Wa ... Inclined portion

Claims (2)

A work table in which a plurality of plate material supporting means for placing a plate material protrudes on the upper surface, a processing portion for processing the plate material on the work table, and a work holder for gripping the end portion of the plate material are fed to the processing portion. The plate material feeding means for performing the above operation, the holder height changing mechanism for changing the vertical position of the work holder, and the work holder so as to be in the raised position when feeding the plate material and in the lowered position when machining. A work holder lifting control means for controlling the holder height changing mechanism,
The workpiece holder lifting / lowering control means sets the workpiece holder in the lowered position when the workpiece holder is in the region near the machining portion and performs machining, and when the workpiece holder is not in the region near the machining portion, It is assumed that the holder is not lowered, and if the work holder in the raised position lifts the plate material out of the movement area of the work holder that is moved by the plate material feeding means, the work holder is lifted by the work holder. inclined portion of the plate occurring in the vicinity of a region which is to be located in the processing unit, the plate material processing machine. The sheet material feeding means, a sheet end portion of the first axial direction among the two orthogonal axes directions and gripped by the workpiece holder is intended for moving the plate in the orthogonal biaxial directions, before Symbol sheet material feeding means the feed control means for controlling is provided, in the feed control means, wherein the first axial stop position, horizontal plate member caused by a plate member is lifted by the workpiece holder of the raised position resulting in sloped portion 2. The plate material processing machine according to claim 1, wherein a correction means for correcting a change in length is provided, and the correction is selectively performed depending on whether or not the workpiece holder is in an area where the work holder is lowered.

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