Sanluo Precision is a well-known machining grinding manufacturer and supplier in China, providing professional customized processing services to customers. It supports the customization of complex and difficult parts. Cylindrical grinding involves using a high-speed rotating grinding wheel to precisely grind the outer surface of the workpiece, achieving very high dimensional accuracy (IT1–IT6 grade), excellent surface quality (Ra0.1–0.4μm), suitable for shafts, discs, and sleeve parts. We employ processes such as longitudinal grinding of the outer circle,切入 grinding， conical grinding， end face grinding， and forming grinding. The diameters of the parts range from 5mm to 200mm， and the lengths range from 10mm to 800mm. By reasonably selecting the material， grit size， hardness of the grinding wheel， optimizing grinding parameters such as the speed of the grinding wheel， the speed of the workpiece， and the feed rate， and using precise detection equipment， Sanluo Precision can ensure the accuracy and efficiency of machining grinding， providing customers with high-quality products and technical support.
Grinding processing covers ID grinding， internal cylindrical grinding， external cylindrical grinding， precision cylindrical grinding， and thread grinding， all of which can achieve high-precision processing and are widely used in multiple high-end fields such as automobiles， aerospace， molds， robots， unmanned aircraft， medical devices， etc. Internal diameter grinding is achieved through the rotation of the grinding wheel， the rotation of the spindle， and the reciprocating motion of the worktable， with an accuracy of ±0.001mm and a surface finish of Ra0.2μm. Due to the small diameter of the grinding wheel and the limited grinding speed (20–30m/s)， the grinding force and heat are large， and special attention must be paid to heat dissipation and chip removal. Internal circle grinding has an accuracy of ±0.001mm， with methods such as planetary grinding and center grinding， suitable for different workpieces. The selection of the grinding wheel needs to be based on the material， matching the abrasive and parameters with the accuracy. The accuracy of external circle and precision machining grinding can reach 0.001mm， in forms such as center type and non-center type， with strict specifications for the selection of the grinding wheel， considering both processing accuracy and efficiency. Thread grinding is skilled in processing hardened materials with HRC50 or above， with an accuracy of ISO 4 or above， capable of correcting thermal treatment deformation， and is the core processing technology for key parts such as high-end fasteners.
Sanluo Precision focuses on the grinding field， with mature technology， capable of providing various conventional and customized grinding services. It strictly controls process details and grinding wheel selection， has provided high-precision components for medical devices， research， molds， and other fields. With professional technology and complete services， it outputs stable and reliable high-precision machining grinding processing services for customers in various industries.
Sanluo Precision's cylindrical grinding is a precision cylindrical surface processing technology. The workpiece moves mainly in a rotational manner. The grinding wheel rotates at high speed to grind the outer circle of the workpiece, while the grinding wheel carriage moves laterally and the worktable moves back and forth to achieve high-precision grinding. The processing range is outer diameter φ5 - 100mm, length ≤ 400mm. The precision is IT1 - IT7 level, tolerance ±0.001 - 0.002mm, roundness 0.002 - 0.005mm, cylindricity 0.003 - 0.01mm, surface roughness Ra 0.1 - 0.8μm. There are three grinding methods: longitudinal grinding (suitable for slender shafts with L/D > 5), transverse grinding (suitable for short shafts, stepped shafts, improving efficiency), and combined longitudinal and transverse grinding, which balance efficiency and precision. The material adaptability is strong, capable of meeting the processing requirements of various materials such as carbon steel, alloy steel, stainless steel, GCr15 bearing steel, etc. The hardness is HB150 - HRC65, and it can be ground before and after quenching, meeting various high-precision processing requirements.
The Sanluo Precision factory is equipped with various types of advanced cylindrical grinding machines, with the maximum grinding diameter ranging from φ5 to 200mm, length ranging from 10 to 200mm, grinding wheel diameter ranging from φ300 to 410mm, width ranging from 50 to 100mm, linear speed ranging from 35 to 50m/s, processing accuracy ranging from IT1 to IT6, roundness ranging from 0.002mm to 0.003mm, cylindricity ranging from 0.003mm to 0.005mm, and surface roughness ranging from Ra0.1 to 0.4μm (for fine grinding, it can reach Ra0.05μm). The CNC cylindrical grinding machines are equipped with an online measurement system to achieve closed-loop control of the grinding process and ensure stable and reliable processing accuracy. The centerless grinding machines cover φ0.03 to 60mm, including through grinding and切入 grinding， with roundness ranging from 0.001mm to 0.003mm， surface Ra value ranging from 0.1μm， and daily output can reach tens of thousands of pieces， suitable for processing optical shaft raw materials. The grinding wheel system uses white corundum for grinding ordinary steel， CBN for grinding hardened steel， diamond for grinding hard alloys， and ceramics for grinding. It is combined with diamond dressing tools and rollers. The workshop is maintained at a constant temperature and humidity， with low vibration， providing long-term stable guarantees for high-precision and precise processing.
Sanluo Precision employs a multi-stage grinding method, using a grinding wheel, guide wheel, and support plate for three-point positioning for rough grinding, semi-finish grinding, finish grinding, and multiple grinding sessions, to make the workpiece dimensions precise. The CNC grinding machine supports automatic looping, automatic grinding wheel adjustment, and automatic size compensation, achieving batch control with a CPK value of ≥1.33. In batch production, the roundness, cylindricity, surface roughness, and form and position tolerances can be consistently and stably traced over time. The precision inspection equipment, including a three-coordinate measuring machine, a roundness gauge, and an interferometer, continuously monitors the processing process and can verify the dimensions and surface quality of each part, providing customers with long-term reliable high-quality products.
Sanluo Precision's cylindrical grinding is widely applied in high-end fields such as bearing manufacturing, optical electronics and communication industries, hydraulic and pneumatic systems, and precision machinery. The bearing raceways and rings are hardened with GCr15, HRC60–64, with an outer diameter of φ5 to 200mm, raceway roundness of 0.002mm, surface Ra of 0.2μm, high rotational accuracy, and uniform fine machining allowance. The crankshaft main journal and connecting rod journal are quenched and tempered with 40Cr/42CrMo, HRC28–32, with an outer diameter of φ30 to 100mm, roundness of 0.008mm, surface Ra of 0.8μm, wear-resistant and strong; the contour of the camshaft is carburized and quenched with 20CrMnTi, HRC58–62, contour accuracy of ±0.002mm, surface Ra of 0.2μm, long service life. The pneumatic piston rod is chrome-plated with 45# steel, outer diameter of φ20 to 100mm, roundness ≤ 0.005mm, surface Ra ≤ 0.2μm, good sealing performance, preventing leakage. Sanluo Precision has provided customized processing services for enterprises such as Huawei, BYD, and Foxconn, producing 100,000 pieces of external cylindrical grinding parts annually, with precision ranging from IT1 to IT7, good roundness, smooth surface, stable batch production, reliable quality, and has received high recognition from the industry.
Sanluo Precision offers micro-meter-level precision to large-scale complex parts with high precision processing services through cylindrical grinding, accurate machining, and high precision machining. With advanced equipment, precise processes, strict quality inspection, and rich industry experience, each batch of parts' dimensions, roundness, and surface quality can be traced and verified, providing reliable processing guarantees for high-end industries such as aviation, optical electronics and communication, precision machinery, and electronic products, and becoming a professional machining grinding supplier trusted by global customers.
