JP2000301267A - Finishing machine for metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform working with a high quality and a high precision, which is free from a dent, etc., even when metal plate feeding by a work holder is performed in a position higher than a metal plate pass line, and to perform the high speed feeding of a metal plate. SOLUTION: In this finishing machine, a holder height changing mechanism 19 changing the up-and-down positions of a work holder 4, and a work holder elevating/lowering control means 29 controlling the holder height changing mechanism 19, are provided. When working is performed while the work holder 4 exists in an area R close to a working part 3, the work holder 4 is made to be in a lowering position by this control means 29. A correcting means 27 is provided, which corrects the Y axis feeding position of a working program 22 at the time of lowering this work holder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a punch press,
The present invention relates to a plate processing machine such as a shearing machine and a laser processing machine.

[0002]

2. Description of the Related Art In a plate 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 moving the work holder 82 that grips the end of the plate material W. On the table 81, a free bearing 83 is installed in order to smoothly feed the plate material.
The height at which the plate material W is supported by the free bearing 83 becomes the 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 gripping level 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 the work member 82 moves.

[0003]

When the plate material is gripped by the work holder 82 at a position higher than the pass line L, the plate material W on the table 81 is
Tilting near. Since the plate material inclined portion Wa is relatively close to the work holder 82, there is not much problem in processing a portion of the plate material W apart from the work holder 82. However, as shown in the figure, when processing the plate material W near the gripping position of the work holder 82, the plate material inclined portion Wa comes to the processing position P, and the plate material inclined portion W
a will be processed. In the case of punching, a plate material inclined portion Wa that has been inclined as shown by a chain line in FIG.
As shown by the solid line in the drawing, the workpiece is processed after being pressed to the upper surface of the die 85 by the punch 84. For this reason, a portion of reduced quality such as a dent in the plate material W occurs, and high-quality processing cannot be performed. When the work holder 82 is close to the processing position P, the inclination angle θ of the plate material inclined portion Wa becomes large, so that the length along the inclination, which is the actual length of the plate material inclined portion Wa, and the position of the work holder 82 are different. The difference from a certain horizontal distance increases, and the processing error increases.

If the height of the work holder 82 is made to coincide with the pass line L by making the free bearing 83 freely move up and down, or using a brush or the like instead of the free bearing 83, the above-mentioned inclination of the plate material occurs. And the occurrence of dents and a decrease in accuracy can be prevented. However, in this case, the work holder moves while rubbing against the free bearings and brushes. Therefore, in order to avoid damage to these free bearings and brushes, it is necessary to move the work holder at a low speed.

An object of the present invention is to provide a plate material capable of performing high-quality and high-precision processing without occurrence of dents even when the plate material is fed by a work holder at a position higher than a pass line, and capable of high-speed feeding of the plate material. It is to provide a processing machine.

[0006]

The structure of the present invention will be described with reference to FIG. 1 corresponding to an embodiment. The plate processing machine according to claim 1, wherein a plurality of plate support means (1) on which the plate (W) is placed.
6) has a work table (2) protruding from the upper surface, a processing part (3) for processing a plate (W) on the work table (2), and a work holder (4) for gripping an end of the plate. A plate material feeding means (5) for feeding the plate material (3) to the processing portion (3); a holder height changing mechanism (19) for changing the vertical position of the work holder (4); And a work holder elevating control means (29) for controlling the change mechanism (19). The work holder elevating control means (29) is provided with the work holder (4).
Is controlled so as to be at the ascending position when performing plate material feeding and at the ascending position when performing processing. In the plate material processing machine having this configuration, the plate material (W) placed on the plate material support means (16) of the work table (2) is gripped by the work holder (4) and moved with respect to the processing section (3). An arbitrary portion of the plate material (W) is processed by the processing section (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 elevation control means (29). Therefore, the work holder (4) does not interfere with the plate material supporting means (16),
The speed of feeding the plate (W) can be increased. When performing machining, the work holder (4) is set to the lowered position. Therefore, 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 or the like does not occur on the plate material (W), and the plate material (W) can be processed neatly. In addition, processing can be performed with high accuracy.

In the plate material processing machine according to the present invention, the work holder raising / lowering control means (29) sets the work holder (4) to the lowered position when performing the processing because the work holder (4) is in the processing section (3). )), Only when processing is performed in the vicinity region (R), and the work holder (4) is
When it is not in the vicinity region (R), it may not be lowered during processing. With this configuration,
When the work is performed while the work holder (4) is in the vicinity of the processing section (3), the work holder (4) is at the lowered position, and the processing is performed in a state where the plate (W) is not inclined. When the work holder (4) is far from the processing portion (3), the work is processed while the work holder (4) is raised. However, the inclination of the plate (W) due to the lifting of the work holder (4). Is generated near the work holder (4), so that the plate (W) is in a horizontal state near the processed portion (3). Therefore, in any case, a horizontal portion of the plate material (W) is processed by the processing portion (3), so that the plate material (W) does not have dents or the like and is processed neatly. be able to. Further, when the work holder (4) is far from the processing portion (3), the work holder (4) is not lowered, so that the descent time and the ascent / return time can be omitted, and the processing cycle time can be reduced.
Further, the work holder (4) descends only in the region (R) near the processing portion (3), and is in the ascending position in other regions. Therefore, in other regions, the work holder (4) has the plate supporting means ( 16), and there is no problem even if the plate material supporting means (16) is fixed.

In the present invention, when the work holder (4) is configured to lower the work holder (4) when processing is performed in the region (R) near the processing portion (3) as described above, The feed control means (26) for controlling the plate material feeding means (5) corrects a change in the horizontal length of the plate material caused by the plate material (W) being lifted by the work holder (4) at the ascending position to form an inclined portion. A correction means (27) may be provided. This correction is selectively performed based on whether the work holder (4) is in a region (R) for lowering the work holder (4). That is, the correction is performed when the work holder (4) is within the descending area (R), and the correction is not performed when the work holder (4) is outside the descending area (R). Is not corrected when is in the descending region (R), but is corrected when it is outside the descending region (R). When the work holder (4) is switched between the ascending position and the descending position, the distance between the work holder (4) and the processing center of the processing section (3) changes due to the vertical movement. Therefore, accurate machining can be performed by correcting the stop position of the work holder (4) by an amount corresponding to the change in the distance.

[0009]

An embodiment of the present invention will be described with reference to the drawings. 2 and 3 are a cutaway plan view and a side view of the plate processing machine. This plate material processing machine has a frame 1
The work table 2 is provided with 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 of the plate material W with a work holder 4. This plate material processing machine is a turret type punch press, and upper and lower turrets 6 and 7 holding a punch mold 41 (FIG. 1) and a die mold 42, respectively, are installed concentrically on the frame 1. You. The processing unit 3 is configured by a punch drive mechanism that hits the punch die 41 of the upper turret 7 at the processing position P.

The work table 2 is composed of a plurality of divided tables 2a and 2b, and some of the divided tables 2b are turret peripheral tables located around the lower turret 7. The plate material feeding means 5 includes a carriage 10 which is movable back and forth.
A cross slide 11 is installed so as to be movable in the right and left (X-axis) directions orthogonal to this, and a plurality of work holders 4 are arranged side by side on the cross slide 11. Carriage 10
Moves on rails 9 provided on the bed 8. The carriage 10 has a portion located above the work table 2 and a portion located below the work table 2, and upper and lower portions are connected to each other by a connecting member (not shown) passing through a gap between the divided tables 2a, 2a. ). The carriage 10 and the cross slide 11 are respectively
They are moved forward and backward by the ball screw mechanisms 14 and 15 by 2 and 13.

On the work table 2, there are provided a free bearing 16 and a brush 17 as plate material supporting means. The plurality of free bearings 16 are dispersedly arranged in a region excluding the vicinity of the processing portion 3, and the brushes 17 are disposed in a region R near the processing portion 3. In particular,
The brushes 17 are provided around the lower turret 7 (for example, the entire turret peripheral table 2b), and the free bearings 16 are distributed over the entire remaining portion on the work table 2. The brush 17 is also provided on the upper turret table 2c (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 through in an interference state. The brush 17 is provided so that the work holder 4 can pass through even in the interference state. Instead of brush 17,
An appropriate plate supporting means such as an elastic body or the like that can pass through even when the work holder 4 is in an interference state may be provided.

The work holder 4 grips the end of the plate material W by vertically sandwiching the end of the plate material W, as shown in FIG.
The vertical position of the cross slide 11 is freely changed by a guide 18, and the position is changed to a vertical position by a holder height changing mechanism 19. The guide 18 includes guide pins 18 a provided on the cross slide 11 on both sides of the work holder 4, and guide pins 1 provided on the work holder 4.
8a. The holder height changing mechanism 19 includes a spring member 19a for supporting the work holder 4 in an elevated state with respect to the cross slide 11, and a cylinder device 19b for pushing down the work holder 4 against the spring member 19a. Cylinder device 19b
Is mounted on the cross slide 11 and pushes down the engagement projection 19c provided on the work holder 4.

The control system will be described with reference to FIG. Control device 2
Numeral 1 is a means for controlling the entire plate processing machine in accordance with the processing program 22.
And a sequence control unit 24. The numerical controller 23 has a main controller 25 and a feed controller 26. The main control unit 25 decodes the machining program 22 and sends a feed command in the machining program 22 to the control unit 26.
And transfers a command related to sequence control to the sequence control unit 24. Feed control means 26
Is a unit for controlling the feed of the Y-axis and X-axis servo motors 12 and 13, and has a correction unit 27. The correction unit 27 is a unit that corrects the feed amount of the Y axis, 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 section 24 is provided with a processing command means 28 and a work holder elevating control means 29. Processing command means 28
Is means for issuing a processing command such as punch driving to the processing unit 3. The work holder raising / lowering control means 29 is a means for giving a lifting / lowering command to the holder height changing mechanism 19.

The work holder raising / lowering control means 29 sets the work holder 4 to the lowered position when the work holder 4 is in the region R near the processing portion 3 and performs processing, and returns the work holder 4 to the raised position when predetermined processing is completed. There is. When the work holder 4 is not located in the region R near the processing section 3, the lowering of the work holder 4 is not commanded. The vicinity region R of the processing part 3 is:
This is an area appropriately set as a work holder lowering area. In the work holder raising / lowering control means 29, whether or not the work holder 4 is in the region R near the processing part 3 is determined in this embodiment from a command of the processing program 22. , For example, an encoder 13 provided in a Y-axis servomotor 13
It may be determined from a or the like. The work holder elevating / lowering control means 29 specifically includes steps S1 and S
Steps S2 and S7 and S9 are performed.

The correcting means 27 corrects 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. is there. The correction amount is, for example, a change Δm (for example, Δm = m′−m) in the horizontal length of the plate material caused by the lifting of the plate material W by the work holder 4 at the raised position to generate the inclined portion Wa (FIG. 5A). ). This correction is performed when the work holder 4 is in a region R in which the work holder 4 is lowered (the region near the processing unit 3). When the work holder 4 is out of this region, no correction is performed.
Correction means 27 is specifically configured as S in the flowchart of FIG.
Steps S1, S2 and S5 are performed.

The operation of the above configuration will be described. An end portion of the plate material W on the table 2 is gripped by the work holder 4, and an arbitrary portion of the processing unit 3 is moved by the forward and backward movement (Y-axis direction) of the carriage 10 and the left and right movement (X-axis direction) of the cross slider 11. It is sent to the processing position P. After this feed, the processing unit 3
The plate material W is subjected to processing such as punching. When one punching operation is completed, a plate material feed for the next operation is performed. In the process of feeding and processing such sheet material,
The work holder 4 is normally in the raised position and moves without interfering with the free bearing 16.

FIG. 6 shows the process of raising and lowering the work holder 4 and correcting the feed position by the control device 21. When the feed control means 26 reads the Y-axis feed command in the processing program 22 (S1), the correction means 27 determines whether or not the Y-axis coordinate is in the work holder descending area (area near the processing section 3) R. Is performed (S2). If it is not within the work holder descending area R, the positioning of the Y coordinate is directly performed by the feed control means 26 (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 separated from the processing portion 3, so that processing such as dents is performed. There is no problem of defective portions. When the processing is completed, the operation moves to the next processing. In the determination step S2, if the position is within the work holder descending area R, the Y coordinate is corrected by the correction means 27 (S5), and positioning is performed using the corrected coordinates (S6). After the positioning, the work holder 4 is lowered by a command from the work holder elevating control means 29 (FIG. 5B), and processing such as punching and cutting is performed in this lowered state (S8). As described above, since the work is performed by lowering the work holder 4, the plate material W can be processed in a horizontal state, and a high-quality processing can be performed without a processing defect such as a dent. In the work holder lowering area R, the plate material supporting means is a brush 17, so that the work holder 4 does not hinder lowering. 1 such as 1 punch
When the unit machining is completed, the work holder 4 is raised (S
9) Move to the operation for the next processing.

In the correction of the Y coordinate (S5), the difference Δm (= m′−m) between the actual length m ′ and the horizontal length m of the plate inclined portion Wa caused by lifting the work holder 4 is corrected. Is corrected. In order to perform the correction in this manner, a portion where the work is processed at the position where the work holder 4 is raised as shown in FIG.
As described above, even if there is a part where the work is performed at the lowered position of the work holder 4, an error in the Y-axis direction does not occur or is reduced between both parts. When the work holder 4 is outside the work holder descending area R, Y
Processing is performed in a state where an error of the difference Δm has occurred in the coordinates, but since the same error always occurs, no error occurs between the processing parts. When entering the work holder descending area R, a correction for positively causing the same error as the above-described error is performed, so that no error occurs between the entire processing portions of the plate material W. In addition, the plate material inclined portion Wa
The inclination angle and length of are changed depending on the material, thickness, size, etc. of the plate material W, and the above-mentioned difference Δm also changes accordingly. Therefore, the correction amount is determined by calculating from these material, plate thickness, size. You may do it. If the material, plate thickness, size, etc. are determined to some extent, a constant correction amount may be used.

FIG. 7 shows an embodiment in which the correction by the correction means 27 in the embodiment of FIG. 1 is reversed. That is, in this example, the correction is performed when the work holder 4 is not in the work holder descending area R (R
(2, R3), if it is in the work holder lowering area R, it is positioned without performing correction (R6), the work holder 4 is lowered (R7), processing is performed (R8), and the work holder 4 is raised. It is returned (R9), and the operation moves to the next processing. Also in this case, even if a part where the processing is performed in the raised state of the work holder 4 and a part where the processing is performed in the lowered state are mixed, an error in the Y-axis direction does not occur between the two parts, or Be relaxed.

In each of the above embodiments, the work holder 4 may or may not be lowered during machining depending on the position of the work holder 4 in the Y-axis direction. However, the work holder 4 is always at the raised position when performing plate feeding. The work holder raising / lowering control means 2 is designed to always be at the lowered position when performing machining.
9, the control may be performed. As described above, when the work holder 4 is always lowered at the time of machining, the correcting means 2
7 is unnecessary. However, the plate supporting means provided on the table 2 needs to be able to lower the work holder 4 at an arbitrary position, and the plate supporting means on the entire surface of the work table 2 is made to be flexible such as a brush or is free. It is necessary to be able to move up and down using the bearing 16 and the like.

[0021]

The plate material processing machine according to the present invention is provided with a work holder raising / lowering control means for controlling the work holder to be at the raised position when the plate material is to be fed and to be at the lowered position when performing the work. Even if the plate material is fed by the work holder at a position higher than the pass line, high-quality and high-precision processing without dents can be performed, and the plate material can be fed at a high speed. Work holder lifting control means
The work holder is set to the lowered position only when the work holder is in the vicinity of the processing part and processing is performed, and when the work holder is not in the vicinity of the processing part, the work holder is not lowered even during processing. The method enables high-quality processing without dents and the like, eliminates frequent lifting and lowering of the work holder, and enables high-speed feeding, thereby shortening the processing cycle time. Further, a correction means for correcting a change in the horizontal length due to the inclination of the plate material is provided, and when this correction is selectively performed depending on whether or not the work holder is within the descending region, the work holder is not provided. High-accuracy machining without errors due to vertical position change can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a conceptual configuration of a sheet material processing machine according to an embodiment of the present invention.

FIG. 2 is a cutaway plan view of the plate material processing machine.

FIG. 3 is a side view of the plate processing machine.

FIG. 4 is an enlarged side view of a work holder and a holder height changing mechanism.

FIG. 5 is an operation explanatory diagram.

FIG. 6 is a flowchart showing work holder elevation control and correction processing.

FIG. 7 is a flowchart showing work holder elevation 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 feed 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 elevating / lowering command means 41 ... Punch 42 ... Die P ... Working position R ... Area near the working part W: Plate material Wa: Inclined portion

Claims (3)

[Claims] 1. A work table having a plurality of plate material supporting means on which a plate material is placed protrudes from an upper surface, a processing part for processing the plate material on the work table, and a work holder for gripping an end of the plate material. Plate material feeding means for feeding a plate material, a holder height changing mechanism for changing the vertical position of the work holder, and the work holder at an ascending position when performing plate material feeding, and a descending position when performing processing. And a work holder raising / lowering control means for controlling the holder height changing mechanism. 2. The plate material processing machine according to claim 1, wherein the work holder raising / lowering control means sets the work holder to a lowered position when the work holder is in a region near the processing unit and performs the processing, and the work holder is configured to perform the processing. A plate material processing machine that does not lower the work holder even when performing processing when it is not in the area near the part. 3. A feed control means for controlling said plate material feeding means, wherein said feed control means includes a change in the horizontal length of the plate material caused by the plate material being lifted by the work holder at the ascending position to form an inclined portion. 3. The plate material processing machine according to claim 2, further comprising a correction unit that corrects the position of the work holder, wherein the correction is selectively performed based on whether the work holder is in an area where the work holder is lowered.