JPH06226355A - Feeding controller for plate bending machine - Google Patents

Abstract

PURPOSE:To prevent the generation of an error at the rising height of a bending piece caused on the difference of holding force between a main clamp and a sub-clamp. CONSTITUTION:This plate bending machine is provided with a die part 1 where the end of a sheet metal W held with an upper die 25 and a lower die 26 is bent by ascending/descending a bending die 27, a main clamp 5 and a sub-clamp 6. The upper die 25 has an automatically die width changing device 35. In this plate bending machine the correction means 53 is provided to correct the feeding amount of the plate to the die 1 according to the discriminated result by which lamp the plate to be held the main clamp 5 or the sub clamp 6. This means 53 is composed of a correcting data setting part 50, a discriminating means of clamp kinds 47 and a correcting means 46 of an axial feeding controller 44. Furthermore, an each long side or short side correcting means 54 discriminating whether the machining is to bend a short side or not in a state making the upper die 25 to a long die width ad changing the correcting amount of the plate feeding amount is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed control device for a plate bending machine which bends an end of a plate.

[0002]

2. Description of the Related Art Conventionally, as a plate material folding machine, as shown in FIG. 9, a plate material W is sandwiched between a fixed lower mold 72 and a vertically movable upper mold 71 so that the upper and lower molds 71, 72 of the plate material W can There is one in which the protruding portion W1 is end-bent by vertically swinging the bending die 73.
The center of the plate material W is sandwiched between a pair of upper and lower rotary pads 75 and 76 of the main clamp 77, and the main clamp 77
By the movement of, the feeding is performed between the upper and lower molds 71, 72 in the direction of movement (X-axis direction). The main clamp 77 has a function of indexing and rotating the plate material W.
After the side bending process, 90 ° or 180 ° index rotation is performed, and the bending process is repeated, whereby end bending of 2 to 4 sides is sequentially performed.

In this type of plate bending machine, if the die width of the upper die 71 is too long, the bending piece portion W1 is bent at the time of bending a side orthogonal to the previously bent bending piece portion W1. 71 will be interfered. For this reason, the upper die 71 includes a large number of blade-shaped split dies 71a (FIG. 10) and a pair of end dies 71.
9b and the split mold 71a is formed by a mold width changing device 74 as shown in FIG.
The die width can be changed by flipping it up to the position shown by the chain line. Further, in the case where the die width changing device 74 is provided in this manner, there is a problem of interference between the main clamp 77 and the die changing device 74 when the plate material dimension in the feeding direction is short, and the minimum workable plate material W can be processed. Limited size. Therefore, a sub-clamp (not shown) is provided separately from the main clamp 77 so that a small-sized plate material can be machined.

[0004]

However, since the clamping force of the plate W is different between the main clamp 77 and the sub clamp, the bent piece portion W is caused by the dragging at the time of bending as follows.
1. There is a difference in the rising height h of 1. That is, during the bending operation, a force F that drags the plate material W toward the bending mold 73 side acts on the plate material W as the bending mold 73 pushes it up. The dragging due to the force F is substantially prevented by the holding by the upper and lower molds 71 and 72 and the holding force by the main clamp 77 or the sub clamp, but a slight amount of dragging occurs.
Due to this drag amount, the length of the portion W1 of the plate material W protruding from the upper and lower molds 71, 72 changes, and the portion W1 accordingly changes.
An error will occur in the rising height h of 1. This error can be eliminated by correcting the feed amount of the plate material W in advance, but it is not possible to obtain sufficient height accuracy with uniform correction.

That is, the amount of drag is small in the main clamp 77 that can be firmly clamped, but is large in the sub clamp with a small clamping force. Therefore, the main clamp 7
Even if the feed amount correction corresponding to the use of No. 7 is set, the correction amount is insufficient when the sub clamp is used, and the starting height h becomes high.

Further, the difference in the rising height h due to the dragging during the bending operation also occurs due to the difference in the width dimension of the plate material W, and also greatly differs depending on which part of the upper die 71 is sandwiched as follows. For example, conventionally, when the four sides of the plate material W are end-bent, the die width of the upper die 71 is matched with the long side Wa of the plate material W, and the bending of the long side Wb is performed after the bending of the short side Wb. ing. As a result, the four sides can be processed without performing the mold width changing operation during the processing of one plate material W. In this case, conventionally, the feed amount is simply corrected in accordance with the dimension of the long side Wa to improve the accuracy of the rising height h with respect to the drag during the bending operation.

However, when bending the short side Wb,
As can be seen from FIG. 10, the upper mold 71 is pressed only by the split mold 71a, and the pressing force of the end mold 71b does not act. Since the split mold 71a is a plate-shaped body having a thickness of, for example, about 5 mm that can be vertically rotated, the end mold 71b generally has a stronger pressing force. Therefore, the split type 7
If only 1a is pressed, the amount of drag increases and an error occurs in the rising height h. This error cannot be eliminated by the conventional feed amount correction according to the long side dimension, but cannot be eliminated even if the feed amount correction is simply performed according to the width dimension of the short side Wb. If the die width is changed when the short side Wb is processed, the feed amount can be corrected according to the die width, but since the die replacement requires time, the cycle time becomes long.

It is an object of the invention of claim 1 to provide a feed controller for a plate bending machine capable of preventing an error in a rising height of a bending piece due to a difference in holding force between a main clamp and a sub clamp. Is to provide.

It is an object of the invention of claim 2 to fold a plate material capable of preventing an error in the rising height of the bending piece due to the difference in the clamping force of the upper mold between the long side processing and the short side processing. It is to provide a feed control device for a bending machine.

[0010]

The structure of the present invention will be described with reference to FIG. 1 corresponding to an embodiment. The feed control device according to claim 1 selects a mold part (1) for end-bending a plate material (W) sandwiched by an upper mold (25) and a lower mold (26) by raising and lowering a bending mold (27). It is applied to a plate material folding machine provided with a main clamp (5) and a sub clamp (6) which are respectively fed between the upper and lower molds (25, 26) with a plate material (W) interposed therebetween. In this plate material bending machine, it is determined which of the main clamp (5) and the sub clamp (6) is to be used for clamping, and the correction amount (Δ
Clamp-specific correction means (53) for changing (X, ΔY) is provided.

According to a second aspect of the present invention, there is provided a feed control device having the die part (1) of the first aspect, wherein the upper die (25) has a pair of end dies and a plurality of split dies. It is applied to the plate folding machine that can be changed. In this plate bending machine, it is determined whether the plate width orthogonal to the feed direction is a width that can be pressed by the pair of end molds, and the correction amount of the plate feed amount to the die part (1) is determined. The correction means (54) for each of the long side and the short side for changing

[0012]

In the case of the construction of claim 1, when the main clamp (5) is used for feeding by the correction means (53) for each clamp,
With the correction amount (ΔX) preset for the main clamp,
The feed amount of the plate material (W) is corrected, and when the sub clamp (7) is used, the feed amount correction is performed with the correction amount (ΔY) set for the sub clamp. Therefore, with respect to the drag of the plate material (W) caused by the bending operation,
The feed amount can be corrected according to the difference in the drag amount due to the difference in the clamping force of each clamp (5, 7). Therefore, the accuracy of the rising height of the bent piece is improved.

In the case of the structure of claim 2, when the plate material width is a width that can be pressed by the pair of end dies, the correction means (54) for each of the long and short sides responds to the clamping force when the end dies are used. The plate material feed amount is corrected by the correction amount, and in the case of the short side that cannot be pressed by the end die, the feed amount is corrected by the correction amount according to the clamping force when the end die is not used. Therefore, for the drag of the plate material caused by the bending operation, the feed amount can be corrected according to the difference of the drag amount due to the difference of the pressing force of the upper die (25). Therefore, the accuracy of the rising height of the bent piece is improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. First, the configuration of the plate bending machine will be described. As shown in FIG. 2, the plate material folding machine A includes a mold part 1 and a plate material feeding device 3. The mold unit 1 includes an upper mold 25 mounted on a ram 24 and driven to move up and down, and a main body frame 2
The lower die 26 fixed to the No. 8 and the bending die 27 that bends the end portion of the plate material W sandwiched by the upper and lower dies 25 and 26 upward or downward.

The bending die 27 is attached to the tip of a rocker arm 29, and the rocker arm 29 is oscillated vertically by three hydraulic cylinders 30 to 32, and is moved back and forth for adjusting clearances for the upper and lower dies 25 and 26. Is possible. The upper die 25 can be changed in die width by a die width changing mechanism 35.

The plate material feeding device 3 is provided with a table 2 on which the plate material W is placed, and a carriage 4 which holds the plate material W on the table 2 with a main clamp 5 and moves it back and forth (X axis direction). The carriage 4 is installed on the bed 13 via rails, and is fed back and forth by a feed screw 14 and a servomotor 15 for driving the feed screw 14. The main clamp 5 includes a pair of pads 5 that sandwich the plate material W from above and below.
a and 5b, and an index motor 19 that rotationally drives the lower pad 5b, the plate material W is rotated at a predetermined angle (for example, 90
Rotate for each index). The upper pad 5a is attached to an elevating holder 18 which can be moved up and down along a vertical rail 17 provided at the tip of the carriage 4, and is lifted and lowered by an elevating device 16 such as a cylinder device.

FIG. 3 is a plan view of the plate material feeding device 3. The table 2 has a carriage passage 10 that allows the carriage 4 to pass therethrough in the center, and is composed of a large number of strip-shaped plates 2a. A centering pin 8 for determining the width of the plate material W projects in a gap 9 between the strip-shaped plates 2a of the table 2 so as to project and retract, and is projected and retracted at the front edge of the table 2 by a cylinder device (not shown). An end locator 11 for front-back positioning is provided.

A pair of sub-carriage 6 is installed on both sides of the carriage 6 so as to be movable back and forth via rails 21, and a sub-clamping device 7 for replacing the plate material is provided at the front end of the sub-carriage 6. The sub-carriage 6 is driven back and forth by a feed screw 22 (FIG. 2) and a servo motor 23 installed on the carriage 4.

FIG. 4 shows a die width changing device 35 of the upper die 25. The upper mold 25 is composed of a large number of blade-shaped split molds 25a and a pair of end molds 25b at both ends.
A is rotatably attached to the horizontal shaft 37 in a downward posture and a flip-up posture. Divided type 25a with downward posture
Is a posture in which the plate material is clamped at the time of bending, and a width obtained by combining the arrangement width L of the split dies 25a in the downward posture with the pair of end dies 25b and the open die 25c attached thereto is equal to the upper die 2
The mold width is 5. The opening die 25c is rotatably hung in an oblique direction and becomes horizontal as the plate material is pressed.

The attitude of the split mold 25b is changed by the rotation of the rotary support member 39 which is rotationally driven, and the rotary support member 39 is driven along the rail 38 by a mold width changing drive source such as a servo motor (see FIG. It is driven back and forth by a feed screw (not shown) and a feed screw (not shown). The pair of end molds 25b are also movable back and forth along rails (not shown) provided in parallel with the horizontal shaft 37, and are driven back and forth as the mold width is changed.

FIG. 1 is a conceptual diagram of a control system. Controller 4
0 is a CNC device (computer type numerical control device),
PMC device (programmable machine controller)
Composed of and. The CNC device executes the machining program 43 of the machining program memory 42 by the arithmetic control unit 41,
The axis feed control section 44 in the arithmetic control section 41 outputs an axis feed command to the servo driver 45 for each axis.
The servo driver 45 includes a carriage (X axis) 4, a sub-carriage (Y axis) 6, and a main clamp (T axis) 5.
Is provided for each of the driving motors 15, 23, and 19, respectively. The axial feed control unit 44 has a correction unit 46 that corrects the X-axis and Y-axis feed amounts according to the correction data of the axial feed correction data storage unit 49. The axis feed correction data storage means 49 includes a clamp type correction data setting unit 5
0 and the work type correction data table 51 during normal machining
And a correction data table 52 for machining the long side of the long die.

The correction data setting section 50 for each clamp type
A correction value ΔX of the axial feed amount of the carriage 4 depending on when the main clamp 5 is used and when the sub clamp 7 is used,
The correction value ΔY of the axial feed amount of the sub-carriage 6 is set. These correction values ΔX and ΔY are transferred to the correction unit 46 of the axis feed control unit 44 according to the instruction of the clamp type determination unit 47. The clamp type determining means 47 determines whether the clamp device used when the plate material W is fed between the upper and lower dies 25 and 26 is the main clamp device 5 or the sub clamp device 7 by executing the machining program 43. It has a function of storing and updating according to the above, and a function of commanding transfer of the correction value. Clamp type discrimination means 4
It is also possible to describe a clamp type-specific correction data feed command in the machining program 43 in advance and transfer the data in accordance with this command. The clamp type discriminating means 47, the clamp type-specific correction data setting section 50, and the correcting means 46 constitute a clamp-specific correcting means 53.

The normal working workpiece type correction data table 51 is set with correction values of the X-axis feed amount when bending the plate material W having a width extending between the pair of end dies 25b of the upper die 25. In this table 51, correction values are set according to various combinations of plate width, plate thickness, material, bending angle and the like. Correction data table 52 for long die short side machining
Is a correction value of the X-axis feed amount when the plate material W is bent by pressing only the split mold 25a of the upper mold 25. In the table 52, correction values are set according to various combinations of plate width, plate thickness, material, bending angle, and the like.

The long / short side discriminating means 48 is the processing program 4
In accordance with the correction data selection command 43a of No. 3, one of the data tables 51 and 52 for normal processing and for short side processing is selected, and the correction corresponding to the music width data included in the correction data selection command 43a is selected. A value is selected and the axis feed control unit 44
It is a means for transferring to the correction means 46. Designation of the plate thickness and material when selecting this correction value is performed by the plate pressure and material data described in the machining program 43,
The bending angle is specified according to the bending angle data in the bending command in the machining program 43. The long / short side discriminating means 48 and the respective data tables 51, 52
And the correction means 46 constitute the correction means 54 for each long and short sides.

The operation of the above configuration will be described. First, the overall schematic operation will be described. The plate material W carried in on the work table 2 in FIG. 3 is positioned in the front-rear direction and the left-right direction, and then the center portion is clamped by the main clamp 5 of the carriage 4 and fed into the mold section 1 by the forward movement of the carriage 4. The fed plate material W is sandwiched between the upper die 25 and the lower die 26 of FIG. 2, and the protruding portions from these upper and lower dies 25, 26 are bent upward or downward by the vertical swing of the bending die 27. . When the end bending of one side of the plate material W is completed in this way, the upper mold 25 is opened upward, the carriage 4 is retracted, and the plate material W is rotated 90 ° or 180 °, and then the plate material W is moved to the mold part 1. Send again. By repeating such an operation, the edge of the plate material W on four or two sides is bent. The sub-carriage 6 is used when the size of the plate material is so small that the main clamp 5 cannot feed it to the mold unit 1, or when the gripping position by the main clamp 5 needs to be changed.

Next, the correction operation according to the clamp type will be described. FIG. 5A shows a case where the plate material W is clamped by the main clamp 5 and bending is performed, and FIG. 5B shows a case where the plate material W is clamped by the sub clamp 7 and bending is performed. In the case of FIG. 3A, the main clamp correction value ΔX in the clamp type-specific correction data setting unit 50 (FIG. 1) is selected as the X-axis feed correction amount when the plate material W is fed into the mold unit 1. It In the case of FIG. 9B, the sub-clamp correction value ΔY in the clamp-type-specific correction data setting unit 50 is selected as the Y-axis feed correction amount. ΔY is Δ
It is a value larger than X.

By correcting the axial feed amount in this manner, the amount of drag generated on the plate material W during the bending operation by the bending die 27 is appropriately corrected. That is, the feed amount can be corrected according to the difference in the drag amount due to the difference in the holding force between the main clamp 5 and the sub clamp 7. Therefore, the processing accuracy of the rising height h of the bent piece portion W1 is improved.

The difference in correction operation between long-side bending and short-side bending will be described. The following description is for the operation when the main clamp 5 is used for bending. FIG. 6 (A) shows
A case where the die width of the upper die 25 is adjusted to the width of the long side Wa of the plate material W and the long side Wa is bent is shown. In this case, since the pair of end dies 25b is used for pressing the plate material W, the correction value corresponding to the corresponding long side width or the like is selected from the normal machining workpiece type correction data table 51 in FIG. , X-axis feed, that is, the axial feed of the main clamp 5 is corrected.

In FIG. 6B, the short side Wb of the plate material W is attached to the upper die 2
The case where only the blade-shaped split mold 25a of No. 5 is pressed and bent is shown. In this case, the correction value according to the corresponding short side width is selected from the correction data table 52 for machining the long side of the long die, and the axial feed of the main clamp 5 is corrected.

As described above, different correction values are set depending on whether or not the end die 25b of the upper die 25 is pressed, and the corresponding correction value is selected to correct the axial feed amount. The feed amount can be appropriately corrected according to the difference in the drag amount during the bending operation, and the processing accuracy of the rising height h of the bent piece portion W1 can be improved.

FIG. 7 shows an example in which a plate material W having a notch b shown in FIG. 7A is bent along each of the folding curves a1 to a4 and bent into the lip groove shape shown in FIG. Show. Folding curve a
The bending at 3, a4 is performed after the plate material W is inverted by 180 ° after the bending at the folding curves a1, a2. In the case of this plate material W, the bending along the folding curves a1 and a4 is similar to that in the case shown in FIG.
Since the end die 25b comes into the clamping state, the correction value of the data table 51 for normal machining is selected as the axial feed amount correction value for dragging. Folding curve a2, a
As in the case shown in FIG. 6B, the bending in No. 3 is a nipping without the end die 25b acting. Therefore, the correction value of the data table 52 for machining the short side is selected as the axial feed amount correction value. To be done.

FIG. 8 shows an example of data input to an automatic programming device (not shown) when a program for performing the processing shown in FIG. 7 is created. The symbol "30/90" in each row in the data group D in the figure is the axis feed of 30 mm (X axis).
The data obtained by performing the bending and bending at 90 ° are shown. The code "1000" in the third line is the data for axis feed of 1000 mm. "L500" on the 2nd and 4th lines
Means a short side bend and uses correction data with a width of 500 mm. Automatically generated machining program 4
In 2, the correction data selection command 43a for selecting the correction value corresponding to the music width of 500 mm in the correction data table 52 is created from the input data of "L500".

In the above embodiment, the correction value of the clamp-type-specific correction data setting section 50 and the correction values of the respective data tables 51 and 52 are used together by an appropriate processing method set in the correction means 46, for example. Used for correction.

[0034]

According to the first aspect of the present invention, the feed control device is provided with the clamp-specific correction means for determining which of the main clamp and the sub-clamp is used to change the correction amount of the plate material feed amount to the die part. Therefore, the feed amount can be appropriately corrected according to the difference in the drag amount due to the difference in the clamping force of the clamp, and the accuracy of the rising height of the bent piece is improved.

A feed control device according to a second aspect of the present invention determines whether or not the plate material width is a width that can be pressed by the pair of upper end molds and changes the correction amount of the plate material feed amount. Since the separate correction means is provided, the feed amount can be corrected according to the difference in the drag amount due to the difference in the pressing force of the upper mold, and the accuracy of the rising height of the bent piece is improved by this.

[Brief description of drawings]

FIG. 1 is a block diagram showing a conceptual configuration of an embodiment of the present invention.

FIG. 2 is a cutaway side view of the plate material folding machine.

FIG. 3 is a plan view of the plate material folding machine.

FIG. 4 is an enlarged front view of the mold width changing device.

FIG. 5 is an explanatory view of a bending operation for each clamp.

FIG. 6 is an explanatory diagram of a bending operation for each of the long side and the short side.

FIG. 7 is an explanatory diagram showing an example of a plate material developed shape and a plate material shape after bending.

FIG. 8 is an explanatory diagram of an example of input data to the automatic programming device.

FIG. 9 is an explanatory view of the operation of conventional bending.

FIG. 10 is a diagram for explaining a conventional bending operation.

[Explanation of symbols]

1 ... Mold part, 4 ... Carriage, 5 ... Main clamp, 6
... Sub-carriage, 7 ... Sub-clamping device, 15, 23
... servo motor, 24 ... ram, 25 ... upper mold, 25a ... split mold, 25b ... end mold, 25c ... open mold, 26 ... lower mold,
27 ... Bent type, 35 ... Mold width changing mechanism, 41 ... Arithmetic control unit
43 ... Machining program, 44 ... Axis feed control unit, 46 ... Correction unit, 47 ... Clamp type determination unit, 48 ... External deceleration unit, 49 ... Long / short side determination unit, 50 ... Clamp type correction data setting unit, 51 ... Normal Machining work type correction data table, 52 ... Long die short side machining correction data table, 53 ... Clamping correction means, 54 ... Long and short side correction means, F ... Drag force, h ... Start-up height, W ... board material,
W1 ... bent piece

Claims (2)

[Claims] 1. A mold part for end-bending a plate material sandwiched between an upper mold and a lower mold by raising and lowering a bending mold, and a main clamp and a sub-clamp for selectively sandwiching the plate material and feeding the plate material between the upper and lower molds. In a plate material folding machine equipped with a plate material bending machine, which is provided with a clamp-specific correction means for changing the correction amount of the plate material feed amount to the mold part by discriminating which of the main clamp or the sub clamp is used for clamping. Machine feed control device. 2. A mold part for end-bending a plate material sandwiched between an upper mold and a lower mold by raising and lowering a bending mold, wherein the upper mold is positioned between a pair of end molds and these end molds. In a plate material folding machine capable of changing the mold width with a large number of divided dies, it is determined whether or not the plate material width orthogonal to the feed direction is a width that can be pressed by the pair of end dies, and the die part A feed control device for a plate bending machine, which is provided with correction means for each of the long and short sides for changing the correction amount of the plate feed amount to the plate.