China's CNC machine tools are gradually transitioning to processing units

Introduction: "At present, the technical level of the world's machine tools is based on the production of CNC machine bed machine, and will be developed in the next 20 years." Researcher Luo Baihui believes in further improving accuracy, efficiency, automation, intelligence and networking. On the basis of this, CNC machine tools are gradually transitioning to machining units and cutting-edge flexible manufacturing systems.
China's "National Medium- and Long-Term Science and Technology Development Plan (2006-2020)" regards "high-end CNC machine tools and basic manufacturing equipment major projects" as one of the 16 major national science and technology projects, and clearly puts forward the goal of developing China's high-end CNC machine tools. The development and application of high-grade CNC machine tools put forward higher requirements for numerical control system. Among them, high-speed and high-precision motion control has become the key technology of modern numerical control system. It has received widespread attention at home and abroad, and has carried out a lot of research from theoretical methods to practical applications. Practice has effectively promoted the technological advancement of high-end CNC machine tools.

The goal of CNC machining is to achieve high speed, high precision and high efficiency machining. How to ensure that the optimal acceleration and deceleration control law with the shortest transition time is achieved under the premise of smooth machine movement, so that the machine tool has the acceleration and deceleration characteristics that meet the requirements of high-speed machining, which is the key problem of acceleration and deceleration research. The acceleration/deceleration control scheme usually has two types: front acceleration/deceleration control and rear acceleration/deceleration control. The front acceleration/deceleration control is generally located before interpolation and after interpolation preprocessing. The acceleration/deceleration control is the command feed speed; the rear acceleration/deceleration control is usually After the interpolator and before the servo controller, the feed speed of each motion axis is controlled. The post-acceleration and deceleration control does not need to calculate the deceleration point. The algorithm is relatively simple. However, if the servo gain of each motion axis is different, it is easy to cause a large trajectory contour error and affect the motion accuracy.

Therefore, the current application of the front acceleration and deceleration control technology. Acceleration and deceleration control methods can be summarized as traditional acceleration and deceleration methods and flexible acceleration and deceleration methods: traditional acceleration and deceleration methods include trapezoidal acceleration and deceleration methods and exponential acceleration and deceleration methods; flexible acceleration and deceleration methods have trigonometric acceleration and deceleration methods, S-curve acceleration and deceleration methods And polynomial acceleration and deceleration methods. The traditional trapezoidal and exponential acceleration and deceleration affect the motion stability due to the sudden change of acceleration. The flexible acceleration and deceleration is attracting attention in high-speed machining due to the continuous acceleration.

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