PC frozen sand medium plays a key role in the low-temperature deburring process, and the quality of its preparation process is directly related to the effect and quality of deburring. In-depth understanding of the impact of the preparation process on the deburring performance is helpful to optimize the process parameters and improve the performance of PC frozen sand medium.
The purity of the raw materials used to prepare PC frozen sand medium is crucial. High-purity raw materials can ensure the chemical stability and consistency of physical properties of the frozen sand medium. If the raw materials contain impurities, the frozen sand medium may expand or contract unevenly in a low-temperature environment, affecting its impact force and removal effect on burrs. For example, impurities may cause local stress concentration when the frozen sand particles come into contact with the workpiece, which not only fails to effectively remove burrs, but may also damage the workpiece surface.
Particle size distribution is an important factor affecting the deburring performance of PC frozen sand medium. Appropriate particle size distribution enables the frozen sand medium to achieve efficient coverage and impact during the deburring process. Generally speaking, smaller frozen sand particles can penetrate into the tiny gaps and holes of the workpiece to remove tiny burrs, while larger particles have stronger impact force and can remove larger burrs. If the particle size distribution is unreasonable, such as particles that are too large or too small, the deburring efficiency will be reduced. Too large particles may not be able to enter the interior of complex-shaped workpieces, while too small particles may not provide enough impact force to remove more stubborn burrs.
The shape and surface characteristics of the pc frozen sand medium also have a significant impact on the deburring performance. Frozen sand particles with regular shapes and smooth surfaces can transmit impact force more evenly when in contact with the workpiece, reducing scratches on the workpiece surface. On the contrary, particles with irregular shapes or rough surfaces may leave scratches on the workpiece surface, affecting the appearance quality of the workpiece. In addition, particles with certain edges and corners may have a better cutting effect when removing burrs, but if the edges and corners are too sharp, they may also cause over-cutting of the workpiece and affect the dimensional accuracy of the workpiece.
The freezing process is a key link in the preparation of pc frozen sand media. Parameters such as freezing speed, freezing temperature and freezing time will affect the performance of frozen sand media. Rapid freezing can make PC materials form fine and uniform ice crystal structures, thereby improving the strength and toughness of frozen sand media. Appropriate freezing temperature can ensure that frozen sand media maintains stable performance in low temperature environments and avoid brittleness or softening. The length of freezing time will affect the internal structure and performance of frozen sand media. Too long or too short freezing time may lead to a decrease in the performance of frozen sand media, thereby affecting the deburring effect.
In the preparation process of PC frozen sand media, adding an appropriate amount of additives can improve its performance. For example, adding lubricants can reduce the friction coefficient between frozen sand particles and workpieces, making it easier for particles to slide on the surface of the workpiece and improving the deburring efficiency. Adding reinforcing agents can improve the strength and wear resistance of frozen sand media, making it less likely to break or wear during repeated impacts on burrs, and extending its service life. However, the type and amount of additives need to be strictly controlled, otherwise it may have a negative impact on the performance of frozen sand media.
The preparation process of PC frozen sand media, from raw material selection to the final freezing treatment, has a decisive influence on its deburring performance at every stage. By strictly controlling the purity of raw materials, optimizing particle size distribution, adjusting shape and surface characteristics, accurately controlling the freezing process and rationally adding additives, it is possible to prepare PC frozen sand media with excellent performance, thereby achieving efficient and high-quality deburring effects and meeting the requirements of workpiece surface quality in different industrial fields.
