Multi-wire cutting equipment and control method thereof

Abstract

Multi-wire cutting equipment comprises a cutting chamber which comprises a plurality of roller wheels distributed in a matrix mode and is used for routing in one direction and winding a cutting wire; the wire storage chamber comprises a take-up mechanism and a pay-off mechanism; the pay-off mechanism and the take-up mechanism are sequentially arranged in the routing direction of the cutting line to form a cutting closed loop; the multiple supporting devices are arranged in the cutting chamber, and the supporting devices are coupled with the cutting lines in a one-to-one correspondence mode and used for detecting the tension of any cutting line; the controller is electrically connected to the take-up mechanism, the pay-off mechanism and the supporting device. And the controller regulates and controls the output torque of the take-up mechanism, the pay-off mechanism and the motor of the supporting device according to the difference value between a detection value and a preset value so as to regulate and control the tension of the cutting wire. In the application process, the tension of each cutting line is monitored and adjusted in real time, it is ensured that the tension of a line net is kept uniform in the cutting process, and material stress is more uniform in the cutting process.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting equipment, and in particular to a multi-wire cutting equipment and a control method thereof. Background Art

[0002] The multi-wire cutting machine is a kind of equipment that can cut workpieces in batches and in multiple pieces. Through the high-speed reciprocating forward and reverse operation of the cutting wire, the workpiece is gradually cut into multiple pieces at the same time. Due to its high efficiency and high precision, it has been widely used in the slicing processing of hard and brittle materials such as sapphire and solar silicon wafers. Since the multi-wire cutting machine is a batch cutting machine, wire breakage during the cutting process will cause a lot of damage to the workpiece, and rewinding the wire will waste a lot of time. In addition, due to the different materials of each part of the hard and brittle material, the wire net is subjected to different tensions, which will cause uneven contours of the workpiece, requiring secondary processing of the workpiece, and also increasing the processing cost. Therefore, the closed-loop tension control method of the multi-wire cutting wire net is a key technology for multi-wire cutting equipment.

[0003] The traditional wire net tension control method of multi-wire cutting equipment only controls one wire of the multi-wire cutting equipment. A tension swing arm with a servo motor is set on the wire storage chamber of the multi-wire cutting equipment. Its drive motor works in torque mode to apply tension to the cutting wire. The swing position of the tension swing arm servo motor can reflect the fluctuation of the cutting wire tension. The read position feedback value and the set zero position are used as the input of the controller. After calculation, an output value is obtained as an auxiliary speed superimposed on the take-up and pay-off roller motor, thereby ensuring the synchronization of the take-up and pay-off roller linear speed with the roller wheel linear speed, and realizing the stability of the swing arm position and wire tension. However, in the cutting process, the tension of the wire net is not only from the tension swing arm T, but also from the tension Δr applied to the wire net by the material itself during the feeding process. Since the cutting material often has the problem of heterogeneity, the tension Δr of each cutting wire in the wire net is inconsistent. Therefore, only setting the tension swing arm cannot control the tension of each wire of the wire net, and it is difficult to maintain the stability of the wire net tension, which will seriously affect the cutting accuracy and cutting quality. Summary of the invention

[0004] In view of the shortcomings of the background technology, an object of the present invention is to provide a multi-wire cutting device and a control method thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A multi-wire cutting device, comprising:

[0007] A cutting chamber, which includes a plurality of roller wheels arranged in a matrix, for routing and winding the cutting wire in one direction;

[0008] The wire storage chamber includes a wire taking-up mechanism and a wire releasing mechanism; the wire releasing mechanism and the wire taking-up mechanism are sequentially arranged along the routing direction of the cutting wire to form a cutting closed loop;

[0009] A plurality of supporting devices are disposed in the cutting chamber, the supporting devices are coupled to the cutting lines in a one-to-one correspondence, and are used to detect the tension of any of the cutting lines; and

[0010] A controller, electrically connected to the wire-receiving mechanism, the wire-releasing mechanism and the supporting device respectively;

[0011] The controller adjusts the output torque of the motors of the wire-receiving mechanism, the wire-releasing mechanism and the supporting device according to the difference between the detected value and the predetermined value, so as to adjust the tension of the cutting line.

[0012] Furthermore, a plurality of first wire grooves are arranged on the roller wheel, and the plurality of first wire grooves are arranged in parallel; the cutting wire is wound in the corresponding first wire grooves in sequence from inside to outside to form a cutting wire net.

[0013] Furthermore, the support device comprises a plurality of support wheels arranged in parallel with each other, a plurality of second wire grooves are arranged on the support wheels, and the plurality of cutting wires are correspondingly fitted into the second wire grooves in sequence from the inside to the outside.

[0014] Furthermore, the support device also includes a support arm and a first drive motor, and the support wheel is transmission-connected to the first drive motor via the support arm.

[0015] Furthermore, the pay-off mechanism includes a pay-off roller and a second drive motor transmission-connected to the pay-off roller; the take-up mechanism includes a take-up roller and a third drive motor transmission-connected to the take-up roller; the take-up mechanism and the pay-off mechanism both include a tension arm guide wheel and a fourth drive motor transmission-connected to the tension arm guide wheel; the roller wheel is transmission-connected to a fifth drive motor.

[0016] Furthermore, the first driving motor and the fourth driving motor are respectively connected to encoders, and the encoders are used to detect the tension of the corresponding cutting line.

[0017] Furthermore, the controller is electrically connected to the first drive motor, the second drive motor, the third drive motor and the fifth drive motor respectively.

[0018] A multi-wire cutting device control method is applicable to a multi-wire cutting device, comprising:

[0019] Step 101: Switching the control mode of each driving motor;

[0020] Step 102: The encoder of any of the cutting lines outputs pulse signals of different sizes, each pulse signal corresponds to a small movement of the motor shaft, and the tension change ΔT of each line is obtained by counting the output pulses;

[0021] Step 103: Calculate the difference of the tension change ΔT between each cutting line and compensate the torque value;

[0022] Step 104: the controller adjusts the torque of each of the first drive motors so that the tension of each cutting wire of the wire web is consistent.

[0023] Furthermore, in step 104, the encoder of each of the first drive motors will record the motor speed value of the tension fluctuation of each cutting line. The controller counts the speed value and converts it into torque to obtain the tension difference torque of each line, and compensates it to each first drive motor through the PID algorithm.

[0024] Furthermore, step 105 is also included: the wire storage chamber reads the actual swing angle of the fourth drive motor through the encoder as negative feedback of the controller; the actual swing angle of the fourth drive motor is compared with the target zero position as input of the controller; the output of the controller is additional speed compensation to the take-up roller motor and the pay-off roller motor, so that the take-up roller motor and the pay-off roller motor are synchronized with the speed of the main shaft motor respectively, thereby eliminating the cutting line tension error.

[0025] The beneficial effects of the present invention are:

[0026] 1. A control method for a multi-wire cutting device proposed in the present invention can ensure that the wire mesh maintains uniform tension during the cutting process by real-time monitoring and adjusting the tension of each cutting wire. During the cutting process, the material is subjected to more uniform force, the cutting edge is smoother, burrs and tearing are reduced, and the cutting quality is improved. The uniform tension reduces the risk of wear and breakage of the cutting wire, extends the service life of the cutting wire, reduces maintenance costs, and achieves energy saving and consumption reduction.

[0027] 2. The present invention proposes a control method for a multi-wire cutting device. By setting an encoder, the motor shaft of the first drive motor in the cutting chamber is directly connected to the encoder to monitor the tension of each cutting wire in real time.

[0028] 3. The present invention proposes a control method for multi-wire cutting equipment. Due to the heterogeneity of the cutting material, the motor encoder on each wire outputs pulse signals of different sizes, and each pulse signal corresponds to a small movement of the motor shaft. By counting these output pulses, the tension change ΔT of each wire can be converted, and the difference between the tension change ΔT between each wire is calculated, and the torque value is compensated to make the tension of each wire in the wire mesh consistent.

[0029] 4. The present invention proposes a control method for a multi-wire cutting device, wherein the controller achieves uniformity of wire web tension by adjusting the torque of each first drive motor.

[0030] 5. The present invention proposes a control method for a multi-wire cutting device, which realizes a joint control strategy of the cutting room and the wire storage room by controlling the initial tension T and the fine-tuning tension ΔT, so as to better control the tension of the cutting wire and the wire network and enhance the robustness and anti-interference of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of a multi-wire cutting device of the present invention;

[0033] Figure 2 A flow chart of a control method of a multi-wire cutting device of the present invention

[0034] In the figure, 10, roller wheel; 201, support wheel; 202, first drive motor; 301, pay-off roller; 302, second drive motor; 401, take-up roller; 402, third drive motor; 501, tension arm guide wheel; 502, fourth drive motor; 60, conductor wheel; 70, arranging motor. DETAILED DESCRIPTION

[0035] Combine the following Figure 1-2 The present invention is described in detail.

[0036] A multi-wire cutting device, comprising:

[0037] A cutting chamber, which includes a plurality of roller wheels 10 arranged in a matrix, for routing and winding the cutting wire in one direction;

[0038] The wire storage chamber includes a wire taking-up mechanism and a wire releasing mechanism; the wire releasing mechanism and the wire taking-up mechanism are sequentially arranged along the routing direction of the cutting wire to form a cutting closed loop;

[0039] A plurality of support devices are placed in the cutting chamber, the support devices are coupled to the cutting lines one by one, and are used to detect the tension of any cutting line; and

[0040] A controller, which is a PLC, is electrically connected to the wire-receiving mechanism, the wire-releasing mechanism and the supporting device;

[0041] The controller adjusts the output torque of the motors of the wire-receiving mechanism, the wire-releasing mechanism and the supporting device according to the difference between the detected value and the preset value, so as to adjust the tension of the cutting line.

[0042] In this embodiment, a plurality of first wire grooves are arranged on the roller wheel 10, and the plurality of first wire grooves are arranged in parallel; the cutting wires are sequentially wound in the corresponding first wire grooves from inside to outside to form a cutting wire net.

[0043] Furthermore, the supporting device includes a plurality of supporting wheels 201 arranged in parallel with each other, a plurality of second wire grooves are arranged on the supporting wheels 201, and a plurality of cutting wires are correspondingly fitted in the second wire grooves in sequence from the inside to the outside.

[0044] Furthermore, the supporting device further comprises a supporting arm and a first driving motor 202, and the supporting wheel 201 is connected to the first driving motor 202 via the supporting arm.

[0045] In this embodiment, the wire-taking mechanism includes a wire-taking roller 401 and a third drive motor 402 connected to the wire-taking roller 401; the wire-releasing mechanism includes a wire-releasing roller 301 and a second drive motor 302 connected to the wire-releasing roller 301; the wire-taking mechanism and the wire-releasing mechanism both include a tension arm guide wheel 501 and a fourth drive motor 502 connected to the tension arm guide wheel 501; and the roller wheel 10 is connected to a fifth drive motor. The wire-receiving mechanism is connected to a wire-arranging motor 70 by a wire-receiving wire wheel 60 near the wire-receiving roller 401, and the wire-releasing mechanism is connected to a wire-arranging motor 70 by a wire-releasing wire wheel 60 near the wire-releasing roller 301.

[0046] The routing direction of the cutting line is as follows: the cutting line is led out from the pay-off roller 301 of the pay-off mechanism, and is wound onto the wire pulley 60 located on one side of the pay-off mechanism. The cutting line at both ends of the wire pulley 60 is at a 90° angle. The cutting line is then horizontally connected to the tension arm guide wheel 501, and then connected to the three wire pulleys 60 in sequence. After forming a cutting line net through the first wire groove of the roller wheel 10, it is led out to the wire pulley 60 located on one side of the take-up mechanism, and then wound onto the pay-off and take-up roller 301 on one side of the take-up mechanism after passing through the wire pulley 60 and the tension arm guide wheel 501. The cutting line connects each system together through the guide wheel to form a multi-wire cutting equipment capable of performing high-speed reciprocating motion of the cutting line.

[0047] Furthermore, the first driving motor 202 and the fourth driving motor 502 are respectively connected to encoders, and the encoders are used to detect the tension of the corresponding cutting line.

[0048] Furthermore, the controller is electrically connected to the first drive motor 202, the second drive motor 302, the third drive motor 402 and the fifth drive motor, respectively. Each drive motor is electrically connected to the controller via a field bus.

[0049] A multi-wire cutting device control method is applicable to a multi-wire cutting device, comprising:

[0050] Step 101: Switch the control mode of each drive motor. Specifically, add the control word for switching the servo motor control mode in the process data object PDO, and use the SMC Set Controller Mode function block to change the first drive motor 202 to the SMC SetTorque (torque) control mode;

[0051] Step 102: The encoder of any cutting line outputs pulse signals of different sizes, each pulse signal corresponds to a small movement of the motor shaft, and the tension change ΔT of each line is obtained by counting the output pulses;

[0052] Step 103: Calculate the difference of the tension change ΔT between each cutting line and compensate the torque value;

[0053] Step 104: The controller adjusts the torque of each first drive motor 202 so that the tension of each cutting wire of the wire web is consistent.

[0054] When the tension variation ΔT between the wires on the wire net is different, the torque of the first drive motor 202 is compensated and assigned through the PLC, and the initial tension T of the wire storage chamber is superimposed, so that the tension of each wire is the same, so that the tension of the wire net remains stable. Specifically, the encoder of each first drive motor 202 will record the motor speed value of the tension fluctuation of each cutting wire. The controller PLC counts the speed value and converts it into torque to obtain the tension difference torque of each wire, and compensates it to each first drive motor 202 through the PID algorithm, so as to control the stability of the tension of the cutting wire net and keep the cutting wire net parallel.

[0055] Furthermore, in step 104, the encoder of each first drive motor 202 records the motor speed value of each cutting line tension fluctuation, and the controller counts the speed value and converts it into torque to obtain the tension difference torque of each line, which is compensated to each first drive motor 202 through the PID algorithm.

[0056] Furthermore, the wire storage chamber reads the actual swing angle of the fourth drive motor 502 through the encoder as negative feedback of the controller; the actual swing angle of the fourth drive motor 502 is compared with the target zero position as the input of the controller; the output of the controller is additional speed compensation to the motor of the take-up and pay-off roller 301, so that the speed of the motor of the take-up and pay-off roller 301 is synchronized with the speed of the spindle motor, eliminating the cutting line tension error.

[0057] Specifically, the reference line speed is converted into the rotation speed of the motor of the take-up roller 401 and the rotation speed of the motor of the pay-off roller 301 according to the radius of the take-up roller 401 and the pay-off roller 301, respectively. On this basis, the speed deviation value is added according to the running direction of the roller. When the pay-off roller 301 performs the pay-off action, the additional speed deviation reduces the motor speed of the motor. On the contrary, when the take-up roller 401 performs the take-up action, the additional speed deviation increases the motor speed of the motor. After starting, the roller that performs the pay-off action initially releases the cutting line slower than the reference line speed of the roller wheel 10, and the cutting line on this side is quickly tightened. The roller that performs the take-up action on the other side initially retracts the cutting line faster than the reference line speed of the roller wheel 10, and the cutting line on this side is also tightened.

[0058] Traditional tension adjustment often requires manual intervention, while the present invention automatically adjusts the tension through a closed-loop control method, thereby reducing manual operations and simplifying the operating procedures of the cutting equipment.

[0059] The control method of the multi-wire cutting device described above can be used not only in the multi-wire cutting device formed by servo control, but also in the multi-wire cutting device in which the motor of the roller wheel 10 is replaced by a multi-wire cutting device controlled by a frequency converter.

[0060] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-wire cutting device, characterized in that: include: A cutting chamber, which includes a plurality of roller wheels arranged in a matrix, for routing and winding the cutting wire in one direction; The wire storage chamber includes a wire taking-up mechanism and a wire releasing mechanism; the wire releasing mechanism and the wire taking-up mechanism are sequentially arranged along the routing direction of the cutting wire to form a cutting closed loop; A plurality of supporting devices are placed in the cutting chamber, the supporting devices are coupled to the cutting lines one by one, and are used to detect the tension of any of the cutting lines; as well as A controller, electrically connected to the wire-receiving mechanism, the wire-releasing mechanism and the supporting device respectively; The controller adjusts the output torque of the motors of the wire-receiving mechanism, the wire-releasing mechanism and the supporting device according to the difference between the detected value and the predetermined value, so as to adjust the tension of the cutting line.

2. A multi-wire cutting device as claimed in claim 1, characterized in that: A plurality of first wire grooves are arranged on the roller wheel, and the plurality of first wire grooves are arranged in parallel; the cutting wires are wound in the corresponding first wire grooves in sequence from inside to outside to form a cutting wire net.

3. A multi-wire cutting device as claimed in claim 1, characterized in that: The support device comprises a plurality of support wheels arranged in parallel with each other, a plurality of second wire grooves are arranged on the support wheels, and a plurality of cutting wires are correspondingly fitted in the second wire grooves in sequence from the inside to the outside.

4. A multi-wire cutting device as claimed in claim 3, characterized in that: The support device also includes a support arm and a first drive motor, and the support wheel is connected to the first drive motor through the support arm.

5. A multi-wire cutting device as claimed in claim 4, characterized in that: The wire-releasing mechanism includes a wire-releasing roller and a second drive motor which is transmission-connected to the wire-releasing roller; the wire-taking mechanism includes a wire-taking roller and a third drive motor which is transmission-connected to the wire-taking roller; both the wire-taking mechanism and the wire-releasing mechanism include a tension arm guide wheel and a fourth drive motor which is transmission-connected to the tension arm guide wheel; and the roller wheel is transmission-connected to the fifth drive motor.

6. A multi-wire cutting device as claimed in claim 5, characterized in that: The first driving motor and the fourth driving motor are respectively connected to encoders, and the encoders are used to detect the tension of the corresponding cutting line.

7. A multi-wire cutting device as claimed in claim 5, characterized in that: The controller is electrically connected to the first drive motor, the second drive motor, the third drive motor, the fifth drive motor and an encoder respectively.

8. A multi-wire cutting equipment control method, applicable to a multi-wire cutting equipment as claimed in claims 1 to 7, characterized in that: include: Step 101: Switching the control mode of each driving motor; Step 102: The encoder of any of the cutting lines outputs pulse signals of different sizes, each pulse signal corresponds to a small movement of the motor shaft, and the tension change ΔT of each line is obtained by counting the output pulses; Step 103: Calculate the difference of the tension change ΔT between each cutting line and compensate the torque value; Step 104: the controller adjusts the torque of each of the first drive motors so that the tension of each cutting wire of the wire web is consistent.

9. A multi-wire cutting equipment control method as claimed in claim 8, characterized in that: In step 104, the encoder of each of the first drive motors records the motor speed value corresponding to the cutting line tension fluctuation, and the controller counts the speed value and converts it into torque to obtain the tension difference torque of each line, which is compensated to each first drive motor through the PID algorithm.

10. A multi-wire cutting equipment control method as claimed in claim 8, characterized in that: The method also includes step 105: the wire storage chamber reads the actual swing angle of the fourth drive motor through the encoder as negative feedback of the controller; the actual swing angle of the fourth drive motor is compared with the target zero position as input of the controller; the output of the controller is additional speed compensation to the take-up roller motor and the pay-off roller motor, so that the take-up roller motor and the pay-off roller motor are synchronized with the speed of the main shaft motor respectively, thereby eliminating the cutting line tension error.

Images