Influence and control of other factors For high-speed machining, the numerical control system also has lifting speed error and servo system hysteresis error. Lifting speed error In high-speed machining, due to the inertia of the control system, the drive system and the electrical and mechanical systems of the controlled object, dynamic errors such as shock, oscillation, overtravel, and out-of-step may occur under high acceleration. Therefore, in terms of system accuracy requirements, the CNC system must have an automatic speed-up function. The automatic lifting speed is automatically realized by the software function of the numerical control system. The basic requirement is that the selected lifting speed law should ensure the trajectory accuracy and positional accuracy, ensure the rapidity, stability and stability of the lifting speed process, and the control algorithm should be as simple as possible. Easy for computer implementation.
Conclusion (1) The normal vector rotation error can be compensated by the method of correcting the position of the core. The concave surface does not need to be compensated. When the system has no automatic compensation function, it is controlled by reducing the tool radius and reducing the error. (2) The linear approximation error is determined by the interpolation chord length. The interpolation chord length is related to the interpolation period of the CNC system and the tool feed speed. Selecting the numerical control system with a small interpolation period or reducing the feed rate can control the linear approximation error. . (3) The residual height error of the cutting line is the main factor affecting the surface roughness of the workpiece in the surface machining. By selecting the reasonable cutting line width process parameters, the error can be controlled.
The lifting speed error is the error form that exists in high-speed CNC machining. The speed of the lifting speed is controlled to a minimum by selecting a reasonable lifting speed law and setting the interpolation processing after the first speed up and down processing. The servo system hysteresis error also exists in high-speed machining, and the influence of the error on the machining accuracy of the product is eliminated by the forward-looking control function of the numerical control system. The error in NC machining is absolute. The technical research to reduce or eliminate the error is endless. Only by analyzing the mechanism of the error, can we take measures to control the machining error and improve the processing quality.
(Finish)
Auxiliary agents, also known as additives, are substances that are added to a material to improve or modify its properties. In the field of polymers, auxiliary agents are commonly used to enhance the processing, performance, and durability of polymer materials.
There are several types of auxiliary agents, each with its own unique properties and applications. The most common type is processing aids, which are added to polymer materials to improve their flow and moldability during processing. Processing aids can improve the surface finish of the final product and reduce the amount of energy required during processing.
Another type of auxiliary agent is plasticizers, which are added to polymer materials to increase their flexibility and reduce their brittleness. Plasticizers can improve the toughness and impact resistance of the final product and are commonly used in the production of flexible PVC products, such as hoses and films.
Other types of auxiliary agents include stabilizers, which are added to polymer materials to protect them from degradation caused by heat, light, or chemical exposure. Stabilizers can improve the durability and longevity of the final product and are commonly used in outdoor applications, such as building materials and automotive parts.
Colorants, fillers, and flame retardants are also common types of auxiliary agents. Colorants are added to polymer materials to give them a specific color, while fillers are added to improve the mechanical properties of the final product, such as its strength and stiffness. Flame retardants are added to polymer materials to reduce the risk of fire and are commonly used in applications where fire safety is critical, such as building materials and electronics.
The choice of auxiliary agent depends on the specific application requirements and must be carefully considered to ensure that the final product meets the desired specifications. It is important to select the appropriate auxiliary agent to achieve the desired performance, processing, and durability characteristics of the polymer material.
In summary, auxiliary agents play an important role in the processing, performance, and durability of polymer materials. There are several types of auxiliary agents, each with its own unique properties and applications, and the choice of auxiliary agent depends on the specific application requirements.
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