How to achieve scratch-free processing of CNC thread blocks?
Publish Time: 2025-05-08
In the manufacturing of military products, the processing accuracy and surface quality of CNC thread blocks directly affect the overall performance and reliability of the equipment. Especially in the use environment of high precision, high strength and high stability, the product must be free of scratches, bumps, pits, steps, sand holes, cracks, burrs, burrs, slag, oil and foreign matter, and keep the surface smooth and clean.1. Material selection and pretreatment: Lay the foundation for high-quality processingHigh-quality raw materials are the first step to ensure the quality of the final product. Thread blocks usually use high-strength alloy steel, stainless steel or special aluminum alloys. These materials not only have good mechanical properties, but also have excellent machinability. Before formal processing, the material needs to be strictly inspected (such as ultrasonic and magnetic particle testing) to ensure that there are no defects such as pores and cracks inside.In addition, the material needs to be annealed or normalized to eliminate internal stress, improve cutting stability, and reduce the risk of deformation during processing. This step is essential to prevent microcracks, deformation or surface damage in subsequent processing.2. Precision CNC machining: using advanced equipment and toolsIn order to achieve high precision and scratch-free surface of thread block, high-rigidity and high-stability CNC machining center must be used for processing. Multi-axis linkage machine tools can complete the one-time forming of complex curved surfaces and threads, avoiding the risk of errors and scratches caused by multiple clamping.At the same time, choosing the right tool is also extremely critical. High-performance tools such as high-speed steel, cemented carbide, PCD (polycrystalline diamond) can effectively reduce cutting temperature and improve surface finish. Reasonable setting of cutting parameters (such as feed speed and spindle speed) can reduce vibration and friction, thereby avoiding scratches or vibration marks on the workpiece surface.3. Fine deburring and polishing process: improving surface integrityEven after high-precision CNC machining, thread block may still have microscopic burrs or uneven edges. Therefore, it is necessary to introduce automated deburring and polishing processes. Commonly used technologies include:Magnetic grinding: using magnetic field to drive abrasive to evenly grind the surface of parts;Electrolytic polishing: using electrochemical reaction to remove tiny surface bumps and improve finish;Manual finishing: professional technicians perform local treatment on special parts;Ultrasonic cleaning: remove fine particles, metal chips and processing residues to avoid subsequent assembly contamination.The combination of these processes can effectively eliminate burrs, burrs, slag and other problems, ensuring that the overall surface of the thread block is as smooth as a mirror.4. Cleaning and anti-pollution treatment: eliminate oil and foreign matterThe cleanliness of the environment must be strictly controlled throughout the processing process. Operators need to wear gloves and use special tools to avoid direct contact with the workpiece to cause fingerprints or oil pollution. After processing, high-pressure water-based cleaning agent + ultrasonic cleaning + hot air drying are used to thoroughly remove surface oil, metal chips and other pollutants.Some military enterprises will also spray anti-rust oil or vacuum pack after cleaning to prevent oxidation and secondary pollution. The entire process needs to be carried out in a constant temperature, low-dust environment to ensure "zero foreign matter, zero oil pollution" when the product is delivered.Although the CNC system thread block is small, it carries a major mission. Every detail of it is related to the operating safety and service life of the entire system. To achieve the true meaning of "no scratches, no burrs, no foreign matter", not only advanced processing equipment and mature process flow are required, but also strict control and continuous optimization of each production link.
