Research on the Control Equipment of Piston Ring CNC Lathe

According to the free-form forming process of the piston ring, it can be seen that the piston ring turning requires the numerical control system to have the general control function, and should also meet the following functional requirements: strong real-time response capability. Piston ring turning is a non-circular curve machining. There are many data involved, and the coordination control with the spindle is strict, especially for high-speed cutting to meet the high-frequency response requirements of piston ring turning; the system has good openness. Piston ring turning has its special control requirements, such as electronic soft mastering, servo control correction, etc. Its control system should have the extended function of special control requirements, and the control robustness is good. Since the linear motor directly controls the driving load, there is no buffering link, and the load change and external interference directly act on the linear motor. This requires the control system to have strong resistance to external interference to improve the stability of the system; the system integration is good. . The control system should be integrated with the piston ring CADCAM system or other systems to simplify user operations.

The structure of the piston ring turning CNC system The piston ring turning CNC system studied in this paper is a two-stage control open structure composed of industrial PC and multi-axis motion controller. The multi-axis motion controller is the core of the system. The system has high-speed arithmetic processing function, has the openness of the upper and lower levels, and is easy to expand the system function, and meets the functional requirements of the piston ring turning on the numerical control system. The hardware structure of the piston ring turning CNC system is as shown in the figure. The upper computer of the system is the industrial control machine (Pentum), and the lower computer is the multi-axis motion controller with the high-speed DSP as the CPU. The PMAC four-axis motion control card of the DeltaTau Company of the United States is selected. The main frequency is 40MHz, which is responsible for the system control tasks such as the variable frequency speed control of the spindle, the real-time motion control of the linear servo motor and the common AC servo motor, and the logic control of the machine tool. The spindle motor is a variable frequency speed regulating motor with a photoelectric encoder; the radial feed motion X-axis linear servo motor is closed-loop control, and the axial feed motion Z-axis servo motor is semi-closed loop control.

The piston ring turning CNC system developed by the software component of the piston ring turning CNC system was developed under the Windows NT environment using VC60. As shown, the system software consists of a master module and several function modules. The system main control module provides the user with a friendly window operation interface, in which each function module is called in the form of a menu. The system function module can be divided into two categories: real-time control module and non-real-time computing management module. The real-time control module is a software module for controlling the movement and motion of the machine tool, and has a time response of milliseconds or higher. The calculation management module does not have a specific time response requirement.

The control interface of the numerical control system is based on the electronic model control of the time base. The electronic master is an electronic pulse emitted by the spindle encoder, and drives the radial feed motor through the master data stored in the system to complete the required feed. Movement, by modifying the system's master data, you can easily complete the processing of various piston ring profiles. Electronic master and mechanical master principle 32 Time-based control concept Time-base control is a control method that combines the motion of the required control axis with the motion of the specified external axis to perform the coordinated motion between the two axes. The slave axis is tracked by the master axis and the slave axis motion is taken as a function of the master axis motion.

Piston ring CNC lathes use pistons instead of conventional mechanical masters for piston ring profile machining. The piston ring CNC lathe spindle rotation is not controlled by the system and is an external shaft. During turning machining, the radial feed motion of the linear servo motor is required to accept the rotation motion of the machine tool spindle, and the movement of the linear motor is controlled by the acquisition of the spindle encoder angle signal, that is, the spindle rotates to each specified angle. The linear motor is required to move to the specified position, and the linear motor movement speed is also controlled by the spindle speed, which is the time base control of the system.

Introducing Web-based workflow management technology into the collaborative reverse engineering system, it is possible to transmit appropriate information to the right people at the right time, effectively organize people, information and application tools to ensure the whole task. The process is completed most quickly. At the same time, the system can automatically monitor the activity status of each unit of the system and make corresponding evaluations, providing decision support for the system to undertake multiple reverse engineering tasks. The application of the workflow management tool can change the system function by modifying the process model without modifying the specific function implementation, thereby achieving the effect of greatly improving the operational efficiency of the entire reverse engineering system.

(Finish)

Specifications

1. Small, light
2. Magnetic drive motor
3. Anti-corrosion PP material
4. Low price, bulk in stock

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