KR100242819B1 - Cnc bending machine - Google Patents

Abstract

The present invention relates to a CNC bending machine that inputs a master model of a shape to be bent, converts it into a pulse signal, and then bends a workpiece, and includes input means for inputting a master model and input profile data. A numerical control unit including a display means for displaying and an input / output interface, a CPU, a ROM, and a RAM; A drive unit including a pulse conversion circuit for converting a signal output from the numerical controller into a pulse signal and a pulse distribution circuit for distributing a pulse signal; A transfer unit for receiving a pulse signal from the drive unit and operating a die and a punch to transfer the workpiece to the punch and the die, and bending the workpiece transferred by the transfer unit into the punch and the die at a predetermined angle. A bending processing unit comprising bending processing means and punch / die positioning means for switching the positions of the punch and the die for processing in a direction opposite to the direction processed by the bending processing means; The CNC bending machine is characterized in that the workpiece to be bent in the bending processing unit is composed of an inspector unit for detecting the error caused by the spring back occurs due to the elasticity of the material to be transmitted to the numerical control unit.

Description

CNC Bending Machine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CNC bending machine, and more particularly, to a CNC bending machine which inputs a master model of a shape to be bent, converts it into a pulse signal, and then bends a workpiece.

In general, CNC machines were mostly for cutting. This is because cutting is almost one-dimensional, requiring only simple control to feed the tool in the horizontal or vertical axis. Therefore, there have been many difficulties in applying numerical control to machining requiring complex control such as bending.

In the plastic processing such as bending processing, the deformation resistance of the material characteristics, that is, in the case of bending, needs to detect the error due to the spring back on the elasticity of the material from time to time so that feedback and data correction should be performed. CNC was inefficient as a ball system.

For this reason, the bending process is almost entirely dependent on the operator's manual work to obtain the bending shape. In the conventional bending process, the work is performed by using a human power, or electric or hydraulic pressure to bend the bending point of the workpiece at a predetermined angle by linearly moving the punch to the die on which the workpiece is placed. To bend the bending point, the workpiece was moved to rest on the die and then bent again by lowering the punch.

As described above, the conventional bending machine can automate a simple linear motion of bending a work point of a workpiece by lowering a punch on a die, but moving a bending work point for processing a complicated shape is performed by a worker. It was done by hand.

As described above, since the bending shape processing is performed by hand, there are the following problems.

(1) The precision of processing is inferior, (2). High processing time, (3). Worker skills are required, and (4). It requires a lot of manpower.

In order to solve the above problems, the present invention, by converting the master model of the shape to be bent into a graphic file and converting it into a pulse signal, according to the bending process of the workpiece to achieve a precise processing, It is an object of the present invention to provide a CNC bending machine that can perform a lot of work in machining time, requires no operator's skill, and requires little work force.

In order to realize the above object, the present invention provides an input means for inputting a master model, a display means for displaying input profile data, and a numerical control unit including an input / output interface, a CPU, a ROM, and a RAM; A drive unit including a pulse conversion circuit for converting a signal output from the numerical controller into a pulse signal and a pulse distribution circuit for distributing a pulse signal; A feed unit for receiving a pulse signal from the drive unit and operating a die and a punch to transfer the workpiece to the punch and the die, and bending the punch and the die to be processed by the transfer means at a predetermined angle. A bending processing unit comprising bending processing means and punch / die positioning means for switching the positions of the punch and the die for processing in a direction opposite to the direction processed by the bending processing means; CNC bending machine is characterized in that the workpiece to be bent in the bending processing unit is composed of an inspector unit for detecting the error caused by the spring back occurs due to the elasticity of the material to be transmitted to the numerical control unit.

In the present invention as described above, by inputting the master model of the design completed in the numerical control unit by a scanner, a CD camera, or the like, or the operator drives the design program by input means such as a keyboard, a mouse, or a digitizer. When profile data is input, coordinates are set on the data of the points, points are added and deleted, or lines and angles are generated after conversion such as movement, and displayed on the display means such as CRT to correct interference light that may occur in processing. Output the corrected signal.

The corrected output signal is computed in accordance with a predetermined variable in the pulse generating circuit of the drive unit to generate a pulse, which is distributed to each means of the bending processing unit in the pulse distribution circuit.

The bending part is operated by the pulse output from the dry part to process the workpiece. The bending part places the workpiece at the center of the punch / die by the transfer means. The lower bending process is performed to pressurize the workpiece, but the phase error light generated at this time is precisely bent according to the data signal corrected by the numerical control unit by the signal detected by the inspector.

When a signal for bending in a direction different from the above bending process is given, the punch / die position is changed by the punch / die position changing means, and the bending process is performed. In this process as well, precise bending processing is performed according to the pulse signal corrected by the inspector.

1 is an overall system block diagram of the present invention CNC bending machine

2 is a flowchart of the AMB program of the present invention.

(a) is the overall flow chart,

(b) is a flow chart of the ABM tracer,

(c) is a flow chart of the ABM generator,

(d) is a flow chart of the ABM processor,

3 is a view showing a bending machining portion,

4 is a view for explaining the conveying means,

5 is a view for explaining the bending processing means,

6 is a view for explaining punch / die position switching means;

7 is a view for explaining the operating state of the bending processing unit of the present invention,

(a) shows the processing shape of the workpiece,

(b) is a view showing a first process of transferring a workpiece,

(c) is a view showing a second process of bending the transferred workpiece;

FIG. 8 is a view showing a third process of bending in the direction opposite to the bending direction in FIG.

(a) shows the first step in which the punch / die holder descends vertically for position change,

(b) shows the second step in which the punch / die holder rotates 180 degrees to change the position of the punch / die in the lowered position,

(c) shows the third step of bending after finishing the position change of the punch / die.

* Explanation of symbols for main parts of the drawings

10: numerical control unit 24: CPU

26: RAM 30: drive section

32: pulse conversion circuit 34: pulse distribution circuit

40: bending processing part 42: transfer means

44: bending processing means 46: punch / die position switching means

50: inspector 60, 61: roller

65: elastic member 66, 66 ': guide block

67, 67 ': guide pin 80, 81: moving shaft

83, 83 ': Moving device 84: Punch block

84 ': Diblock 86, 86': Spiral shaft

90: punch / die holder 93: restraining means

94: vertical lowering means 95: rotating means

96: Vertical cylinder 97, 97 ': Guide pin

98: rotating cylinder D: die

P: Punch S1, S2: Servo Motor

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall system block diagram of the CNC bending machine of the present invention, the present invention is composed of a numerical control unit 10, a drive unit 30, and a bending processing unit 40, the inspector unit 50 and the like.

The numerical control unit 10 includes input means such as a scanner 12, a keyboard 14 and a CD camera, display means by a CALTI 16 or a printer, an input / output interface 18 and a CPU 24 or ROM 22 which stores a control program, and RAM 26 which stores input data.

The RAM 26 sets an ABM tracer area, an ABM generator area, and an ABM processor area.

The ABM tracer aims to extract contour data from an image input from a scanner or the like. Incidentally, the noise gauging function can be performed on the image and the pixel can be erased within a range that does not significantly damage the original data.

In addition, the ABM generator outputs the contour data extracted from the ABM tracer in the desired file format (PLT. DXF.NC) by editing, deleting, adding, and scaling.

In addition, the ABM processor checks the interference between the bending point of the workpiece and the tool and uses the data edited by the ABM generator to interface with the bending device.

2 is a flow chart of an ABM program of the present invention, where (a) is an overall flow chart, (b) is a flow chart of an ABM tracer, (c) is a flow chart of an ABM generator, and (d) is a flow chart of an ABM processor. .

As can be seen in (a), the input data generates predetermined data through the ABM tracer 200, is signal-processed by a predetermined procedure in the ABM generator 300, and in the ABM processor 400. The final data is complete.

(b) shows the flow chart of the ABM tracer 200 described above, which asks whether to process the image because the master model is only in the still image state when the master model is input through the scanner or the CD camera. When the operator requests image processing, the noise is enlarged or reduced to remove noise. If the operator does not feel the necessity of image processing, the processing proceeds to the tracing process.

The next step is to choose whether to tracing automatically or manually. If you choose automatic tracing, the program extracts the outline of the image and removes unnecessary points other than those required for processing and saves them as a file. On the other hand, if manual tracing is selected, the operator extracts the outline of the image by input means such as a keyboard or a mouse, and asks if the operator should remove the unnecessary point for processing the program. If it is not required to remove it, exit it.

In (c), the flow chart of the ABM generator 300 is shown, which inputs pixel data as a first step. The above described data may be inputted as data stored in a file in the ABM tracing or inputted as the extracted data.

The program asks if you want to edit the input pixel data. If the operator needs to make some modifications, such as modifying the model or changing the ratio, the program edits or scales the pixel data and converts the file. If not needed, convert the file as is.

The conversion of these files required only the X-axis and Y-axis data in the ABM tracer, but the ABM processor needed data for various processing conditions such as feed and bending of the workpiece as well as X-axis and Y-side data. The file is converted into a data file (FB file), an NC file, a plotter file (PLT file), and an AUTOCAD file (DXF file) for the amount and bending of the workpiece.

(d) illustrates the flow chart of the ABM processor 400. The ABM processor requires a predetermined procedure for inputting pixel data or inputting pixel data in the ABM generator. .

After entering the file for the machining data, the program asks if you want to check the interference between the tool and the workpiece and the workpiece and the workpiece, or if there is a risk of interference during machining. If there is no need to check for interference, check the machining process through simulation as it is.

In the machining process confirmed through simulation, it outputs the necessary conditions for the machining, generates the machining data for it, and saves it as a file.

Therefore, when the master model is inputted as data of the points by the input means, the CPU 24 determines the contour between the points according to the signal output from the ABM trace area of the RAM 26 and sets the coordinates of the points. It also sets, moves, adds, deletes, and scales each point by the signal output from the ABM generator area, converts it, and then creates lines and angles. In addition, by virtually processing the data generated by the line and the angle as a signal output from the ABM processor area, and visually showing it through a display means such as a CRT (16), to check the interference during bending, keyboard 14 or the mouse or The control data is input or modified by an input means such as a digitizer.

In addition, the CPU 24 converts the data passed through the above process into a data signal that can be recognized by the drive unit 30 and outputs the data signal.

The drive unit 30 transmits and receives a signal through serial communication and parallel communication, and includes a CPU and a power unit of its own, and is divided into a pulse conversion circuit 32 and a pulse distribution circuit 34. .

The pulse conversion circuit 32 receives the data output from the numerical control unit 10 from the module, and the bending processing unit 40 moves a pulse signal for controlling the transfer of the workpiece and its transfer distance, and a punch and a die. A pulse signal for bending the workpiece to a predetermined angle and a pulse signal for switching the positions of the punch and the die to change the bending direction.

In addition, the pulse distribution circuit 34 distributes each pulse signal converted by the pulse conversion circuit 32 to each element corresponding to each process of the bending processing unit 40 and outputs the same.

The bending processing part 40 is composed of a conveying means 42, a bending processing means 44 and a punch / die position switching means 46.

The conveying means 42 is operated by a pulse signal to convey the workpiece so that the bending processing node is located at the machining center line of the punch and the die. Thus, the conveying means 42 is operated by one fewer times than the bending processing point.

In addition, the bending processing means 44 enters the punch and the die with a constant pressing force toward the workpiece in order to bend the workpiece transferred by the transfer means 42, wherein the punch and the die are processed. Since it touches the surface of the bend, the bending angle changes according to the entry distance. This is a condition to be preceded by an experiment and should be referred to when the numerical control unit 10 processes the input signal.

The punch / die position switching means 46 is for bending in a direction opposite to the direction in which the bending has been previously processed. Since the bending direction is determined by the direction in which the punch is pressed, in order to reverse the bending direction, the punch and the die Reverse the position of.

In addition, the inspector 50 searches for a phase error due to a spring back generated when the workpiece is processed by the bending processing means 44 of the bending processing part 40 and feeds the feedback to the numerical controller 10. In the phase error compensation mode, a control mode for controlling the machining by compensating the phase error is set to correct the data for precise machining.

FIG. 3 is a view illustrating the bending processing part 40 on the bed B. As described above, the conveying means 42, the bending processing means 44, and the punch / die position switching means 46 are formed. .

Since the conveying means 42 rotates toward each other, the rollers 60 and 61 mounted in contact with each other are disposed between the rollers 60 and 61 if the workpiece 100 is located between the rollers 60 and 61 therebetween. (61) is conveyed in the rotational direction, and the distance between the rollers (60) and (61) is adjusted according to the thickness of the workpiece 100.

The rollers 60 and 61 are fixed until the workpiece 100 is bent so that the rollers 60 and 61 can adjust the position according to the shape of the workpiece 100 that is generated while the workpiece 100 is bent. The hole 62 is formed. The sliding hole 62 has an arc shape centering on the bending point of the punch P and the die D. As the work piece 100 is bent at a bending angle around the bending point, the roller ( 60 and 61 were rotated and advanced in the processing direction of the workpiece 100.

In addition, the bending processing means 44 has moving shafts 80 and 81 which are mechanically connected to the punch P / die D in a direction perpendicular to the entry direction of the workpiece 100 of the bed B. It is mounted in the guide hole 82 formed to form a.

In addition, the punch / die position switching means 46 is formed of a guide hole 82 'extending the guide hole 82 formed on the bed B, and includes a punch / The die holder 90 is mounted. The punch / die holder 90 includes a punch and a die, and is vertically lowered to rotate 180 degrees to switch the positions of the die and the punch.

In the figure, 99 and 99 'is a sensing sensor, which transmits to the numerical controller 10 that the workpiece 100 being suppressed through the transfer means 42 is initially detected and is being transferred. ) To control the signal output.

Figure 4 shows the conveying means 42 in more detail, the base plate (BF) on the lower side is formed to form a plate (F) and a rotating shaft (63) on which the punch / die position switching means is mounted on one side, Support plates 64 and 64 'are positioned on the opposite side of the rotation shaft 63 of the base plate BF at a predetermined interval back and forth, with guide blocks 66 and 66' having a hollow for mounting therebetween. ) Is fitted to the guide pins 67 and 67 'on which the elastic members 65 and 65' are mounted on the cylindrical circumference.

Since the elastic members 65 and 65 'are mounted around the guide pins 67 and 67' as described above, the coil spring is most preferable. It is also possible to use a rubber filler having an inner diameter equal to or greater than the diameter.

The lower plate 68 is mounted on the upper side of the guide blocks 66, 66 'mounted on both sides of the support plates 64, 64', and the servo motor S1 is mounted on the lower side thereof. In the center of the lower plate 68, a hole for the rotation shaft of the servo motor S1 is formed.

In addition, an extension block 69 is mounted on an upper side of the lower plate 68, and the extension block 69 forms a support portion on both sides of a portion mounted on an upper side of the lower plate 68, and has a space in the center thereof. It has a portion extending in the front direction in the upper side, the support block 70 is formed in which the fixing protrusions are formed on the upper and lower ends in the front direction.

The drive shaft 72 and the driven shaft 73 connected to the lower side of the roller 60, 61 mounted on the upper side of the slide hole of the base are extended while penetrating through the slide hole in the upper fixing protrusion of the support block 70. It is.

In addition, a drive gear G1 and a driven gear G2 are mounted below the fixed protrusion of the drive shaft 72 and the driven shaft 73. The drive shaft 72 extends below the drive gear G1. And rotatably mounted through the lower fixing protrusion of the support block 70, and a poly 75 is mounted on the lower side of the lower fixing protrusion, which is connected to the rotation shaft of the servo motor S1 by a belt 76. It is.

Therefore, in the above-described conveying means 42, the rotational force transmitted to the rollers 60 and 61 is transmitted by the drive gear G1 and the driven gear G2, and the rotational force of the drive gear G1 is the belt ( It is transmitted from the servo motor S1 through the 65 and the pulley 75.

In addition, the processing accuracy is improved by circularly moving the rollers 60 and 61 for fixing the workpiece while the workpiece is bent around the machining point by bending. However, the shock absorber 77 is mounted to the left and right to buffer the shock due to the inertia at the left and right rotation limits of the transport means 42 due to the sliding, and the piston of the shock absorber 77 is A seating groove 78 for guiding the left and right rotation limits of the transport means was formed.

In addition, as the workpiece is bent and contracted in a direction perpendicular to the bending direction, the transfer means 42 is provided with guide pins 67 and 67 mounted on both sides of the support plate 64 mounted on the base plate BF. Slide forward in all directions along the '), and the rollers 60 and 61 make circular motions along the slide holes, and further correct the error due to the shape change of the workpiece by bending, further increasing the processing precision. It is to let.

An elastic member 65 is mounted on the cylindrical circumference of the guide pins 67, 67 'between the guide blocks 66, 66' and the support plates 64, 64 'of the transfer means 42. There is minimized the impact of the slide movement of the transfer means (42).

5 shows the bending processing means 44 in detail, the bending processing means 44 is to bend the workpiece by moving the punch (P) and the die (D), which is a moving device (83) 83 'and the moving shafts 80 and 81 are fastened with a bolt.

The punch (P) and the die (D) protrude into a bed to bend the workpiece transferred to the bed, which is a stable shape on the lower side for higher structural strength and pressure movement for bending processing Punch block 84 and die block 84 'are formed.

The moving shafts 80 and 81 are intermittently coupled to the punch blocks 84 and the die blocks 84 ', respectively, at portions facing each other, which are punches P and dies D, respectively. ) Is attached when the linear motion is performed toward the workpiece, and released when the punch P and the die D are to be switched. However, in order to switch the positions of the punches P and the dies D, the punches P and the die holders 90 are made downward, so that the punches P and the dies D are movable shafts 80. It is in a free state in the vertical direction downward from 81 and in a fixed state in the axial direction.

To this end, the moving shafts 80 and 81, the punch block 84, and the die block 84 'have a clutch shape 85 and 85' at the engaging portion.

That is, the mounting jaw is formed downward from the ends facing each other, the mounting groove is formed upward, and the punch block 84 and the die block 84 'are formed on the lower surfaces of the moving shafts 80 and 81. Mounting jaws and mounting grooves are respectively formed in a direction opposite to the coaxial 80 and 81.

Accordingly, the movable shafts 80, 81, the punch block 84, and the die block 84 'are opposed to each other and are engaged in the axial direction while engaging the mounting jaws and the mounting grooves formed in the axial direction with each other. In the direction it simply overlaps one another and is in a downwardly open state.

The moving devices (83) and (83 ') bolted to the moving shafts (80) and (81) are driven by the servo motor 9S2, and the servo motor (S2) is predetermined from the drive unit (30). It is driven by receiving a pulse signal. However, since the servomotor S2 is driving its own rotating shaft, a means for converting the rotating movement of the rotating shaft into a linear movement for operating the moving devices 83 and 83 'is required.

There may be a number of means for converting the rotational motion of the servomotor S2 into linear motion. That is, the cam which makes a rotating shaft have a fixed amount of eccentricity can also be used, and it can obtain by means similar to the crankshaft of an automobile. However, the above-described means uses a spiral motion in which the linear motion can be infinite in this embodiment since the linear motion is somewhat restricted.

On the other hand, this bending processing means 44 is intended to be able to simultaneously transmit the rotational force generated by using the servo motor (S2) as one to both moving devices (83, 83 ') on both sides.

Of course, it is possible to devise a way to install each servo motor in each of the moving devices (83, 83 '), which requires two servo motors, and the overall size is increased, and also two surges There is a risk of excessive load on the servo driver to drive the motor.

The moving devices 83 and 83 'in this embodiment are provided with spiral shafts 86 and 86', respectively, and are equipped with shaft moving members 87 and 87 'which move along the spiral shaft. have. Therefore, in the present embodiment, as described above, the driving force generated in the rotation shaft C1 of one servomotor S2 is transmitted to the spiral shafts 86 and 86 'of the moving devices 83 and 83'. Allow it to rotate. As described above, the transmission means of the rotational force may be variously driven, but in this embodiment, the indirect transmission means is selected, and the toothed belt transmission is applied.

That is, the length of the rotation axis C1 of the servomotor S2 reaches the spiral shafts 86 and 86 'of both the moving devices 83 and 83', and each of the moving devices 83 and 83 '. The toothed pulleys P1 and P1 'are installed on the spiral shafts 86 and 86', and the spiral shafts 86 and 86 'are also mounted on the rotational shaft C1 of the servomotor S2. The toothed pulley P2 and P2 'are mounted on a portion corresponding to the toothed pulley P1 and P1'.

Then, the toothed pulley P1 (P1 ') of the spiral shaft and the toothed pulley P2 (P2') of the servomotor rotational shaft were connected to the toothed belt B1 (B1 '). Accordingly, the rotation shaft C1 that rotates by the operation of the servomotor S2 provides the rotational force to the spiral shafts 86 and 86 'through the toothed belts B1 and B1'.

However, since the rotation shaft C1 of the servomotor is formed to have a length enough to include both moving devices 83 and 83 'as described above, bending occurs easily, and resonance occurs due to rotation. There is a risk of breakage. Therefore, bearing BE1 (BE1 ') was attached to the left and right sides of each tooth pulley P2 (P2'), and the bearing BE2 was attached to the center of the rotating shaft C1.

By the way, although mentioned above, since the punch (P) and the die (D) are to bend the workpiece in relative motion with each other, the spiral shafts 86 and 86 of the respective moving devices 83, 83 '. ') Should form different spiral directions. That is, since the moving direction of the spiral shafts 86 and 86 'must be relative to the rotational direction of the rotational axis C1 of the servomotor S2, one of the spiral shafts has one left screw and the other has a right screw. Should be

In more detail, the moving device (83) (83 ') receiving the rotational force from the servomotor (S2), the support plates (F2) (F3) (F2') (F3 ') to both sides of the spiral shaft. Is formed integrally by welding or bolts to form a predetermined space and upright on the bottom of the bed, and the base plate (F4) (F4 ') on the lower side of the support plates (F2) (F3) (F2') (F3 ') ) Is joined.

Then, between the support plates (F2) (F3) (F2 ') (F3') is installed a spiral shaft 86, 86 'connected to the rotary shaft and the toothed belt of the servo motor S2 as described above. It is supported by an unsigned bearing while penetrating the support plates F2, F3, F2 'and F3'. In addition, the axial movement member (87) (87 ') forming an inner diameter spiral to move in the axial direction along the spiral formed on the cylindrical circumference of the spiral shaft (86, 86'), and the shaft movement member below Rails 88 and 88 'are mounted on the base plates F4 and F4' to facilitate axial movement of the 87 and 87 'and the rails 88 and 88' and the shaft. An unsigned rail head is coupled between the moving members 87 and 87 'while having a shape corresponding to that of the rail to smoothly move the shaft of the shaft moving members 87 and 87'.

And, the sensor (89, 89 ') is mounted on one side of the base plate (F4) (F4') toward the rail (88, 88 '), which is a shaft moving member (87, 87') It limits the movement of the axis.

Accordingly, when a predetermined pulse signal is applied from the drive unit 30, the servomotor S2 is operated to transmit rotational force to the spiral shafts 86 and 86 'through the toothed belt, thereby driving the shaft moving members 87 and 87. ') Is moved along the rails 88 and 88', so that the moving shafts 80 and 81, which are bolted to the shaft moving member, move together with the shaft moving member, and the moving shaft and the shaft. The punch block 84 and the die block 84 'engaged in the direction also move together to bend the workpiece.

6 shows the punch / die position shifting means 46 in detail. The punch / die position shifting means 46 lowers the punch / die holder 9 and rotates it 180 degrees to rotate the punch P and the die. It is to switch the position of (D).

Accordingly, the punch / die position switching means 46 includes a restraining means 93 for restraining the punch block 84 and the die block 84 'in the vertical and rotational directions to the punch / die holder 90; In addition, a vertical lowering means 94 for vertically lowering the punch / die holder 90 and a rotating means 94 for rotating the punch / die holder 90 are required.

The punch block 84 and the die block 84 'are mounted in a guide hole 82' formed in the punch / die holder 90. The punch block 84 and the die block 84 'are lower than the punch block 84 and the die block 84'. It has a doe tail shape, and thus the guide hole 82 'of the punch / die holder 90 also has a shape corresponding thereto, thereby forming the restraining means 93.

Therefore, after the punch block 84 and the die block 84 'are coupled to the guide holes 82' of the punch / die holder 90, the punch block 84 and the die block 84 'are restrained in the up and down direction and free in the axial direction. have.

The vertical lowering means 94 for vertically lowering the punch / die holder 90 is formed on the base plate BF on which the transfer means 42 is mounted and the lower plate F connected to the rotation shaft 63. The rotation means 95 for rotating the punch / die holder 90 is mounted on the upper plate F ′ above the vertical lowering means 94 and is connected to the punch / die holder 90. have.

This will be described in more detail as follows.

The vertical lowering means 94 has a vertical cylinder 96 and guide pins 97 and 97 'for guiding vertical movement on both sides thereof are mounted at both sides of the lower plate F and the upper plate F'. However, the lower plate (F) can form a coaxial calibrated with the bush (BS), but in a free state in the vertical direction, to achieve a fixed state with the upper plate (F ').

Accordingly, the vertical cylinder 96 is operated to expand or compress the piston (not shown) to raise or lower the upper plate F 'to vertically move the punch / die holder 9.

In addition, the rotation means unit 95 is installed on the upper side of the upper plate (F ') and is equipped with a rotary cylinder (98) in which a rotary shaft is integrally mounted on the bottom of the punch / die holder (90).

Accordingly, when the rotary cylinder 98 is operated, the punch / die holder 9 is rotated while the rotary shaft rotates to switch the positions of the punch P and the die D. FIG.

By the way, the vertical cylinder 96 and the rotating cylinder 98 is operated by a working fluid, preferably pneumatic. Thus, the vertical cylinder 96 and the rotary cylinder 98 operate in the supply direction and the return direction of the working fluid determined by the solenoid valve (not shown). The solenoid valve determines a flow direction of the working fluid by a predetermined signal output from the drive unit.

Therefore, when a signal for determining the position change of the punch P / die D is input from the drive unit 30 to the solenoid valve, the flow direction of the working fluid is converted to the vertical cylinder 96 of the vertical lowering means 94. The working fluid is supplied to the port in the direction in which the piston is compressed and the working fluid comes out of the opposing port, and the punch / die holder 90 is guided down to the guide pins 97 and 97 '. Then, the working fluid through the solenoid valve is supplied to the working cylinder in the direction of rotating the rotor to the rotating cylinder 98 of the rotating means portion 95 to rotate the punch / die holder 90 to punch (P) And the position of the die (D) is switched.

When the positions of the punch (P) and the die (D) are switched, the solenoid valve is operated again to block the flow path of the working fluid supplied to the rotary cylinder 98, and the flow direction of the working fluid is changed to convert the working fluid into a vertical cylinder ( The piston of 96) is supplied to the port in the direction of inflation, and the punch / die holder 90 is raised to be bent.

7 is a view for explaining the operating state of the bending processing unit of the present invention, (a) is a view showing the processing shape of the workpiece, (b) is a view showing a first process for transferring the workpiece, (c) is a view showing a second process of bending the transferred workpiece, (d) is a view showing a third process of bending in the direction opposite to the bending direction in (c).

(a) shows the machining shape of the workpiece 100 as an example, which is a master model with a completed design.

In the figure, reference numeral 101 denotes a machining start point, 102 denotes a machining end point, and (P1), (P2), (P3) and (P4) represent respective machining points. That is, the processing point P1 between (101) and (P2) is processed at right angles, and (P2) between (P1) and (P3) is bent to have a blunt gap.

In addition, at (P3), the bending direction is changed to have an obtuse angle, and at (P4), it is processed into a rectangular shape.

The following will be described in the order of processing along the processing point determined in the processing shape of the workpiece.

As can be seen in (b), by operating the servo motor of the conveying means 42 by the pulse signal output from the drive unit, the rollers 60, 61 are rotated, the pinch P and the die ( When the machining point P1 of the workpiece is located at the machining center line Z of D), the operation is stopped. In this process, the machining starting point 101 of the workpiece 100 is detected by the sensing sensors 99 and 99 ', and the feed amount is the machining starting point at the machining center line Z of the punch P and the die D. The distance transferred is from the distance at which the machining point P1 is transferred.

(c) shows bending by pressing the punch P and the die D to the processing point P1 of the workpiece 100.

When the first process shown in (b) is completed, the moving shafts 80 and 81 are moved along the guide holes 82 by a servomotor operated by a pulse signal applied from the drive unit, thereby allowing the workpiece 100 to be processed. Press the machining point P1.

As the processing point P1 of the workpiece 100 is bent to the punch P and the die D, the workpiece is bent at an acute angle to the punch P position. Accordingly, the rollers 60 and 61 of the conveying means 42 holding the workpiece are slid along the sliding hole 62 in the bending direction of the workpiece 100 to change their positions and move in the machining direction.

However, the bending angle is determined according to the distance entered from the contact of the workpiece and the punch P, which is a condition to be preceded when the machining program is executed.

In addition, a spring back phenomenon occurs due to the elasticity of the workpiece during the bending process, which is sensed by the inspector 50 and fed back to the numerical controller 10 to correct the data.

The bending process is to process the processing point (P1) and (P2). P3 is to be bent in the direction different from the above (P1) and (P2).

FIG. 8 illustrates a process for machining P3 in FIG. 7C, in which (a) illustrates a first step in which the punch / die holder is vertically lowered for position shifting, and (b) ) Shows a second step in which the punch / die holder is rotated 180 degrees to change the position of the punch / die in the lowered position, and (c) shows the third step of bending and finishing the position change of the punch / die. will be.

As shown in (a), the first step is the punch / die holder 90 being lowered by the operation of the vertical cylinder of the vertical lowering means according to the signal applied to the solenoid valve of the punch / die position switching means 46. In this case, the punch block 84 and the die block 84 'are lowered together with the punch / die holder 90 because the punch / die holder 90 is restrained in the vertical direction in the shape of a dough tail. , It is released from the moving shafts 80 and 81 in the free state downward.

In the second step shown in (b), the punch / die holder 90 is rotated by the rotation cylinder of the rotation means according to the signal applied to the solenoid valve of the punch / die position switching means 46 to punch (P). And the position of the die (D) is switched.

In this case, the punch block 84 and the die block 84 'are coupled to the clutch shapes of the moving shafts 80 and 81. That is, even if the punch / die holder 90 is rotated, the moving shafts 80 and 81 remain as they are, so that the moving shaft 80 coupled with the diblock 84 'before the punch / die switching is performed by the punch block 84. And a moving shaft 81 coupled to the rotational direction and coupled to the punch block 84 are coupled to the die block 84 'and restrained in the axial direction.

(c) shows the third step of bending processing in the state where the switching step of the punch P and the die D is completed. The processing point P3 is bent to the punched P position, which is different from the P1 and P2, and accordingly, the rollers 60 and 61 holding the workpiece are slid.

In the bending process, the inspector 50 detects a machining error and corrects the data with a precise data signal.

In the present invention as described above, the master model for which the design is completed in the numerical control unit is input to the input means such as the scanner 12 or the CD camera, or the operator designes the input means such as the keyboard 14 or the mouse or the digitizer. When the profile data is input by driving the program, the coordinates are set on the data of the points, and the lines and angles are generated after the addition, deletion, or movement of the points, and the display means such as the CRT 16 can be used for processing. The corrected data signal can be output by allowing the corrected interference light to be corrected. The corrected output signal is calculated in accordance with a predetermined variable in the pulse conversion circuit 32 of the drive unit 30 to convert the pulse, and is distributed to each means of the bending processing unit 40 in the pulse distribution circuit 34. do.

The bending part 40 is operated by the pulse output from the dry part 30 to process the workpiece 100. The bending part of the workpiece 100 is punched / dieed by the transfer means 42. To be in the center of the bending, and the bending means (44) to press the punch (P), the die (D) to the workpiece 100 to bend, at this time the error generated during the bending process in the inspector unit 50 The bending signal is precisely processed according to the data signal corrected by the numerical controller 10 by the sensed signal.

When a signal bending in a direction different from the above bending process is given, the punch / die position is changed by the punch / die position changing means 46, and the bending process is performed. In this case, the machining data is processed according to the signal for which the machining error is detected. Calibrate to make precise machining.

According to the present invention, the master model of the shape to be bent is input into a graphic file, converted into a pulse signal, and the workpiece is then bent, thereby (1) precise machining and (2) short machining. It can do a lot of work in time, (3) it is unnecessary for the skill of the operator and (4) there is little effect on the work force.

Since what has been described above is merely a mere example in all respects, the present invention should not be limitedly interpreted based on this. Therefore, modifications and equivalent embodiments that fall within the true spirit and scope of the present invention shall fall within the claims of the present invention.

Claims (13)

A numerical control unit (10) comprising input means for inputting a master model, display means for displaying input profile data, and an input / output interface (18), a CPU (24), a ROM (22), and a RAM (26); Inputs the signal output from the numerical control unit 10 and arithmetic processing, and transmits the signal in serial communication and parallel communication, and has its own CPU and power unit, pulse conversion circuit 32 for converting into a pulse signal, and the pulse signal A drive unit 30 including a pulse distribution circuit 34 for distributing; A transfer unit 42 for receiving a pulse signal from the drive unit 30 to operate the punch P and the die D to transfer the workpiece to the punch P and the die D, and the transfer unit ( A bending processing means 44 for bending the workpiece 100 conveyed by 42 into the punch P and the die D at a predetermined angle, and the direction processed by the bending processing means 44; A bending processing portion composed of a punch / die position shifting means 46 for shifting the positions of the punches P and the die D for processing in the opposite direction; CNC bending machine is characterized in that the workpiece 100 is bent in the bending processing unit 40 is composed of an inspector unit for detecting the error caused by the spring back caused by the elasticity of the material to transmit to the numerical control unit The RAM 26 of the numerical control unit 10 includes: an ABM tracer area for determining an outline between input points and setting coordinates of each point; An ABM generator area for generating lines and angles after moving, adding, deleting, and scaling data of each point defined in the ABM tracer area; CNC bending machine characterized in that it has an ABM processor area for checking the interference during bending while visually showing through the display means such as CRT (16) by virtually processing the data of the line and angle defined in the ABM generator area . According to claim 1, wherein the conveying means 42 of the bending processing unit 40 includes a servo motor (S1) for driving the rotary shaft by receiving a pulse signal from the drive unit; CNC bending machine characterized in that the roller 60, 61 is transmitted from the servo motor (S1) to the drive shaft and the driven shaft and rotates and feeds the work between. The method of claim 1 or 3, wherein the conveying means 42 of the bending processing unit 40 is a roller (60), 61 during the bending process the punch (P) and die (D) on the bed (B) A guide pin fitted in a hollow formed in the guide blocks 66 and 66 'mounted on both sides of the lower plate 68 supporting the servomotor S1 and moving circularly along the slide hole 62 formed at the center ( 67) A CNC bending machine, characterized in that for correcting an error due to bending deformation by linearly moving in the bending direction rhk straight along the 67 '. 5. The CNC bending method according to claim 4, wherein elastic members 65 and 65 ′ are mounted on the cylindrical circumference of the guide pins 67 and 67 ′ in the moving direction of the guide blocks 66 and 966 ′. Mercy. The bending processing means (44) of the bending processing part (40) comprises: a punch block (84) having a stable shape under the punch (P); A die block 84 'having a stable shape under the die D; The punch block 84 and the die block 84 'are coupled to the clutch shape 85 and 85' which form the mounting jaw and the mounting groove formed from the ends facing each other downward in the axial direction and are in a restrained state in the axial direction. Moving shafts 80 and 81 which move in a free state in a downward direction and move along a guide groove 82 formed on the bed B; CNC bending machine, characterized in that consisting of a moving device (83) (83 ') is fastened to the lower side of the moving shaft (80) (81) and driven according to the pulse signal applied from the drive unit (30). 7. The apparatus of claim 6, wherein the moving device (83) (83 ') comprises: a servo motor (S2) for receiving a pulse signal from the drive unit (30); Spiral shafts 86 and 86 'connected to the rotary shaft of the servo motor S2 by toothed belts; Axial movement members (87) (87 ') forming an inner diameter spiral for axially moving along a spiral formed in a cylindrical circumference of the spiral shafts (86) (86'); Rails 88 and 88 mounted on the base plates F4 and F4 'smoothly in the axial movement of the shaft moving members 87 and 87' below the shaft moving members 87 and 87 '. ')and; CNC bending, characterized in that it is mounted toward the rail 88, 88 'is composed of a sensor (89, 89') that serves to limit the movement of the shaft movement member 87, 87 ' Mercy. 8. The CNC bending machine according to claim 7, wherein the spiral shafts (86 ') have different spiral directions. The method of claim 1, wherein the punch / die position switching means 46 of the bending machining portion 40 keeps the punch block 84 and the die block 84 'in a vertically constrained state and in an axial free state. Restraining means 93; Vertically mounted on the lower plate F by releasing the coupling with the moving shaft by vertically lowering the punch block 84 and the die block 84 'in the constrained state in the vertical direction downward in the constraining means 93. Lowering means (94); The punch block 84 and the die block 84 ', which are vertically lowered from the vertical lowering means 94, are rotated by 180 degrees, and are connected to the restraining means 93 and the vertical lowering means 94 CNC bending machine, characterized in that consisting of a rotating means portion 95 is mounted on the upper plate (F ') installed on the upper side. The method of claim 9, wherein the restraining means 93 is characterized in that the punch / die holder 90 of the cylindrical shape and forming a guide hole 82 'extending the guide hole 82 formed on the bed CNC bending machine. 11. The method of claim 10, wherein a dough tail shape is formed below the punch block 84 and the die block 84 'fitted into the guide hole 82' of the punch / die holder; CNC bending machine, characterized in that the guide hole (82 ') of the punch / die holder (90) is shaped to match the shape of the punch block and the die block (84'). The vertical cylinder (96) of claim 9, wherein the vertical lowering means (94) is controlled by a solenoid valve that receives a signal from a drive part and converts a flow path of a working fluid, and a piston supports the upper plate (F '). )Wow; CNC bending machine which guides the vertical movement to both sides of the vertical cylinder (96) and is mounted on both sides of the lower plate (F) and the upper plate (F '). 10. The method of claim 9, wherein the rotating means portion 95 is installed on the upper side of the upper plate (F ') and is integrally mounted on the bottom of the punch / die holder 90 to operate by receiving a signal from the drive unit CNC bending machine characterized by a rotating cylinder (98) controlled by a solenoid valve for converting a fluid flow path.