Pipe threading machine tool turret rotation control method

Abstract

The invention discloses a rotation control method for a tool turret of a pipe threading machine, which is characterized in that aiming at the operation performance problem of a coarse positioning disc and a hydraulic motor between stations, the action of a coarse positioning pin of each station is independently controlled by programming, and the differential control of each station is realized; on the premise of ensuring that the original whole program architecture is not changed, differentiated adjustment can be carried out on parameters according to the actual operation condition of each station, and other stations cannot be influenced; on the basis that hardware equipment is not changed, the independent control function of each station of the multi-station tool turret is achieved completely through PLC program logic control, each station can achieve the independent parameter giving function in the operation process, and it is ensured that each station can achieve the precise operation control function; in the using process, the fault processing time is shortened by 95% compared with the previous similar problems, and the practical value and the popularization value are large.

Description

Technical Field

[0001] The invention relates to the technical field of pipe threading machines, in particular to a turret rotation control method of a pipe threading machine. Background Art

[0002] The threading machine turret is the carrier of the tool during the threading process of the workpiece. Since it uses a multi-station turret, automatic tool change is required during the processing. The tool change efficiency and accuracy must be guaranteed to meet the use requirements, which puts forward more stringent requirements on the tool change control in turret processing.

[0003] At present, the threading machines used are driven by hydraulic motors, the turret encoder signal is used for positioning, the fine locating pin's movement signal is used to determine whether the turret is locked, the coarse locating pin's movement time is realized by program control, and the hydraulic motor's running speed is adjusted by the throttle hole on the coarse locating pin and the hard contact between the coarse locating pin and the turret ratchet; sequential control is used, and the multi-station hydraulic turret calls the same and identical control program when executing the tool change command, and the control method has limitations; when the threading machine turret hydraulic motor stability, turret spindle wear is uneven, locating pin brake end wear is uneven, or turret ratchet surface wear is uneven, calling the same set of control programs during the turret operation will frequently result in some stations failing to rotate to the position or some stations being over-positioned, resulting in the turret positioning not matching the target position or the turret failing to lock; it usually takes 3h-48h to process by mechanical means, which seriously affects the on-site production rhythm.

[0004] Chinese patent CN202311406823.X (A turret control method, device, equipment and medium) focuses on a turret tool change control method for NC machining programs. It is an invention for optimizing NC machining programs and belongs to the previous process of the present invention. Chinese patent CN202211336271.5 (a lathe servo-powered turret control method) mainly adopts a control method in which a servo motor is embedded in the turret body and driven by electricity, and the positioning is performed by the servo motor. Its main disadvantage is that the servo motor is integrated inside the turret. Due to the small space and heat dissipation, the working environment of the servo motor is relatively unfriendly, the motor failure rate is high, and as the turret mechanical spindle and other parts wear, it will cause inaccurate positioning when the servo motor is driven. In addition, when problems occur, it is inconvenient to replace the motor and the fault handling time is long. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems existing in the above-mentioned prior art and to provide a method for controlling the rotation of the turret of a pipe threading machine.

[0006] The technical solution provided by the present invention is: a method for controlling the rotation of a turret of a pipe threading machine, characterized in that it includes the following steps: S1, add multi-station and manual control parameter setting functions to the H code parameter setting interface on the threading machine HMI; S2, under the turret control function module, establish local variables; S3, processes the HMI given parameters, converts them into valid data that can be recognized by the control instructions and temporarily stores them in the register; S4, the NC machine tool processing program issues a tool change command, pulls out the fine positioning pin and the coarse positioning pin, and the hydraulic motor starts to run at high speed; S5, using the turret encoder to locate the previous station of the target station, and using it as the intermediate variable for each station parameter; S6, controlling whether the parameter setting of different stations is effective by connecting or not the intermediate variable of the station before the target station; S7, the turret sequence control program calls the parameters of each station to execute the tool change command; S8, according to the different parameters of different workstations, the coarse positioning pins are controlled to decelerate the motor; S9, after the positioning is completed by the internal sensor of the turret combined with the turret code disc, a turret locking signal is sent to control the movement of the fine positioning pin and complete the turret locking; S10: If the turret cannot be effectively positioned or locked at any workstation, fine-tune the HMI interface parameters of step S1; S11, the tool change completion signal is fed back to the NC, and the NC machining program continues to execute the subsequent machining program after receiving the tool change completion signal; S12, processing is completed.

[0007] Furthermore, the parameters of the step S1 can be adjusted according to the parameters of the workstations used to produce different button types.

[0008] Furthermore, the step S2 establishes local variables and defines the variable formats.

[0009] Furthermore, in step S5, a sensor installed in the turret is used to locate the previous station of the target station.

[0010] Beneficial effects of the present invention: 1. Under the premise of ensuring that the existing sequential control architecture remains unchanged, the parameters can be adjusted differently according to the actual operation of each station without affecting other stations; 2. Without changing the mechanical and electrical equipment, the independent control function of each station of the multi-station turret is realized completely through PLC program logic control. Each station can realize the function of individually given parameters during operation, ensuring that each station can achieve the function of precise operation control. During use, the troubleshooting time of similar problems was reduced by 95% compared with the previous ones, which has great practical value and promotion value. It has been applied to 3 threading machines within the company with good results. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0012] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings.

[0013] like Figure 1 As shown, a method for controlling the rotation of a turret of a tube threading machine, taking a five-station turret as an example, includes the following steps: The first step is to add five workstations and manual control parameter setting functions to the H code parameter setting interface on the threading machine HMI; the machine tool operator adjusts the parameters of the workstations used according to the production of different buckle types; The second step is to create local variables and define the variable format in detail under the turret control function module; The third step is to process the HMI given parameters through the program, convert them into valid data that can be recognized by the control instructions and temporarily store them in the register; In the fourth step, after the PLC receives the tool change command from the NC machine tool program, it controls the corresponding solenoid valve to pull out the fine positioning pin and the coarse positioning pin, and the hydraulic circuit of the hydraulic motor is fully opened and starts to run at high speed; In the fifth step, the hydraulic motor drives the turret and the turret code disk to rotate through the main shaft, and the sensor installed in the turret locates the previous station of the target station, which is used as the intermediate variable for the given parameters of each station; Step 6: When the intermediate variable of the previous station of the target station is connected, the program is started to call the corresponding parameters of the target station temporarily stored in step 3; Step 7: The turret sequence control program calls the parameters of each station to execute the tool change command; Step 8: According to the different parameters of different workstations, different parameters are called to control the movement of the coarse positioning pin and slow down the motor; In the ninth step, after the positioning is completed by the internal sensor of the turret combined with the turret code disk, the turret locking signal is sent to control the movement of the fine positioning pin and complete the turret locking. At this point, a complete tool change process is completed; Step 10: If the turret cannot be effectively positioned or locked at any workstation, fine-tune the HMI interface parameters of step S1; In the eleventh step, the tool change completion signal is fed back to the NC, and the NC machining program continues to execute the subsequent machining program after receiving the tool change completion signal; Step 12: Processing is completed.

[0014] A turret rotation control method for a pipe threading machine of the present invention addresses the operating performance issues of the coarse positioning plate and the hydraulic motor between each workstation, and controls the control parameters of each workstation individually through a program, thereby achieving differentiated control of each workstation according to the operating conditions.

[0015] It should be understood that all technical features not elaborated in detail in this specification belong to the prior art. Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. A person of ordinary skill in the art can, under the guidance of the present invention, make more forms without departing from the scope of protection of the present invention and the claims, and all of these fall within the scope of protection of the present invention.

Claims

1. A method for controlling the rotation of a turret of a pipe threading machine, characterized in that: The steps include: S1, add multi-station and manual control parameter setting functions to the H code parameter setting interface on the threading machine HMI; S2, under the turret control function module, establish local variables; S3, processes the HMI given parameters, converts them into valid data that can be recognized by the control instructions and temporarily stores them in the register; S4, the NC machine tool processing program issues a tool change command, pulls out the fine positioning pin and the coarse positioning pin, and the hydraulic motor starts to run at high speed; S5, using the turret encoder to locate the previous station of the target station, and using this as the intermediate variable for each station parameter; S6, controlling whether the parameter setting of different stations is effective by connecting or not the intermediate variable of the station before the target station; S7, the turret sequence control program calls the parameters of each station to execute the tool change command; S8, according to the different parameters of different workstations, the coarse positioning pins are controlled to decelerate the motor; S9, after the positioning is completed by the internal sensor of the turret combined with the turret code disc, a turret locking signal is sent to control the movement of the fine positioning pin and complete the turret locking; S10: If the turret cannot be effectively positioned or locked at any workstation, fine-tune the HMI interface parameters of step S1; S11, the tool change completion signal is fed back to the NC, and the NC machining program continues to execute the subsequent machining program after receiving the tool change completion signal; S12, processing is completed.

2. A method for controlling the rotation of a turret of a pipe threading machine according to claim 1, characterized in that: The parameters of step S1 can be adjusted according to the parameters of the workstations used to produce different button types.

3. The method for controlling the rotation of a turret of a pipe threading machine according to claim 1, wherein: The step S2 establishes local variables and defines the variable formats.

4. The method for controlling the rotation of a turret of a pipe threading machine according to claim 1, wherein: The step S5 addresses and locates the previous station of the target station through the sensor installed in the turret.

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