Sanluo Precision is a well-known machining grinding manufacturer and supplier in China, mainly providing customers with efficient and high-precision customized grinding processing services. It supports the customization of complex and difficult parts. The grinding wheel, guide wheel, and worktable of the centerless grinding machine support the workpiece with three points, without the need for center hole positioning. This is particularly suitable for continuous processing of slender shaft parts, with an efficiency that is 3 to 5 times that of ordinary external cylindrical grinding. The equipment is capable of processing parts with diameters ranging from φ0.1mm to 150mm and lengths from 0.5mm to 500mm, with a roundness of 0.002mm and a surface roughness of Ra0.1μm. It can meet the requirements of high-precision processing and accurate processing, providing customers with comprehensive processing services from micro-roller pins to medium shafts. It can process various carbon steel, alloy steel, stainless steel, and non-ferrous metal materials. Machining grinding is highly efficient, has stable processing accuracy, and good surface quality, meeting the high standards of modern industry for batch production of precision shaft parts.
Centerless grinding (including precision centerless grinding, centerless cylindrical grinding) is an ultra-high precision external circular processing technology that does not require a centering pin or chuck to fix the workpiece. Instead, it relies on a support plate or fixture to hold the workpiece between a high-speed rotating grinding wheel and a low-speed rotating guide wheel for grinding. The processing accuracy can reach 0.001mm, and for precision levels, it can achieve a roundness of 0.0005mm, dimensional accuracy of ±0.0005mm to ±0.001mm, and surface roughness of Ra0.1 to 0.2μm. The processing range covers φ0.1mm to 300mm, and it can process smooth cylindrical bodies, conical parts, stepped shafts, irregular rotary surfaces, pipe materials, and rods, etc., especially suitable for the processing of large-batch, long-to-short ratio shaft parts. The processing efficiency is high, and there is no clamping deformation, excellent part consistency and interchangeability, although the adjustment is difficult, it can be achieved through professional technology for stable mass production. Machining grinding is based on no center positioning and relies on the workpiece's own rotation for positioning. The roundness accuracy is better, and the clamping has no impact on the part, making it more suitable for large-scale processing.
Sanluo Precision, as a professional processing service provider with mature technology, has been deeply engaged in this field for many years. It strictly controls material supply, learns the latest process technologies, and has accumulated rich material processing experience. It can efficiently control processing deformation and surface quality, and can process various materials such as carbon steel, alloy steel, hard alloys, non-ferrous metals, and ceramics, engineering plastics, etc. The company provides a full range of centerless grinding and customized processing services, widely serving medical aesthetics, medical robots, unmanned aircraft, mold processing, automotive manufacturing, industrial robots, etc. With high precision, high efficiency, and high consistency in processing capabilities, it has reached long-term cooperation with many large material suppliers and demand enterprises, meeting the diverse needs of different customers for ordinary-level and precision-level machining grinding, helping customers enhance product competitiveness.
The machining grinding process of Sanluo Precision uses a support plate with a V-shaped groove to hold the workpiece. The guide wheels rotate at a speed of 50 to 150 r/min to drive the workpiece to rotate. The grinding wheel rotates at a high speed (linear speed of 25 to 35 m/s), and the core machine parameters (grinding wheel speed of 20-45 m/s, guide wheel speed of 15-30 m/min, guide wheel inclination angle of 1°-10°, support plate angle of 20°-35°, etc.) are scientifically set. At the same time, attention is paid to auxiliary parameters such as cooling, lubrication and rinsing. No centering clamping or tailstock support is required, and the loading and unloading time is much shorter than that of ordinary grinding. The processing range is diameters of φ0.3 - 100mm and lengths of ≤ 300mm for smooth shafts, stepped shafts and slender bar materials (length-to-diameter ratio > 10:1). The processing accuracy is diameter tolerance IT6 - IT7, roundness 0.001 - 0.002mm, cylindricality 0.002 - 0.003mm, surface roughness Ra 0.1 - 0.8 μm. The high precision and high efficiency processing capability enables centerless grinding to ensure the consistency of dimensions and surface quality in mass production, significantly shortening the production cycle, improving the overall manufacturing efficiency, ensuring processing stability and part quality, and is an indispensable high-precision processing section in mechanical processing.
The Sanluo Precision factory is equipped with various types of equipment, including precision centerless grinders and CNC centerless grinders, which can well adapt to various specifications of parts. The spindle wheel diameter ranges from 350mm to 600mm, with a rotational speed of 1500rpm to 2500rpm. The precision is IT6, the roundness is 0.003mm, the guide wheel rubber material has a diameter of 250mm to 400mm, and the support plate is a hard alloy with adjustable angles. The spindle material includes white corundum and CBN. The repeatability accuracy is ±0.005mm. It supports fully automatic cycle, parameter storage, automatic wheel dressing and automatic size compensation. The workshop has constant temperature and humidity, and low vibration, providing a long-term stable foundation for high-precision processing and accurate processing, enabling high-precision processing to be traceable over a long period in large-scale production. The combination of precision equipment and a stable environment ensures that the processing precision of each part can reach the micron-level requirement, and can also maintain consistent excellent quality for large batches and highly complex parts.
Sanluo Precision employs a multi-stage machining strategy in its process, using a combination of grinding wheels, guide wheels, and support plates for three-point positioning. The cutting depth gradually decreases through coarse, semi-finish, finish, and multi-stage grinding, with batch control ensuring a CPK value of ≥1.33. This guarantees roundness, surface roughness, and batch consistency. The grinding wheel, guide wheel, and support plate system remains stable over time, and high-precision machining can be verified in batch production, thereby achieving long-term traceability and high consistency in processing. Additionally, it is equipped with precision inspection equipment such as a three-coordinate measuring machine, roundness tester, and interferometer, which can monitor the processing status in real time, ensuring that the dimensions, roundness, and surface roughness of each part meet the requirements, providing customers with long-term stable and verifiable processing guarantees.
Centerless grinding has been widely applied in high-end fields such as aerospace, optical electronics and communication industries, precision machinery, and electronic products. For bearings, the diameter is φ0.3 - 10mm, the length is 10 - 50mm, the roundness is 0.001mm, the surface Ra is ≤ 0.2μm, and the hardness HRC is 60 - 64; for piston pins, the diameter is φ15 - 30mm, the roundness is 0.002mm, the surface Ra is 0.2μm, the valve stem φ5 - 10mm, resistant to high temperature and corrosion; for precision shafts, the diameter is φ0.05 - 50mm, the roundness is ≤ 0.002mm, the surface Ra is 0.1μm, the guide pillar φ10 - 40mm, the roundness is ≤ 0.003mm; for electronic product camera shafts, the diameter is φ3 - 8mm, the roundness is 0.005mm, the connector pins φ0.1 - 1mm, the roundness is 0.003mm. In terms of conventional general parts, the roundness tolerance reaches 0.001mm, the straightness tolerance is 0.002mm, the surface roughness Ra is 0.1μm, the dimensional tolerance is ±0.001mm, which can basically meet the precision requirements of most customers. Sanluo Precision has customized machining grinding parts for enterprises such as Huawei and Foxconn, producing tens of thousands of machining grinding parts annually. With speed, precision, cost and service, it has won the trust of customers. The high efficiency and high precision of machining grinding have made it an indispensable important processing technology in aerospace, optical electronics and communication precision parts, electronic products, and precision machinery parts processing fields.
Sanluo Precision, relying on precise processing and stable processing quality, offers customers comprehensive customized processing services ranging from micrometer-level precision to complex parts. The processing range is from φ0.02mm to φ30mm, with roundness of 0.2μm. The surface roughness Ra of the precision bearing ceramic ball matching the shaft reaches 0.1μm. For medical instrument surgical handles, 316L stainless steel is used, with high surface integrity requirements. For optical instrument guide rails, aluminum alloy 7075 material is used, with linearity controlled within 0.005mm per 1000mm. IT1 to IT4 precision grades processing is available. The form and position tolerances comply with ISO1101 standards, meeting the ultimate requirements of high-end manufacturing for precise parts, ensuring that each batch of parts can be traced and verified. It is a trusted professional supplier by global customers. Our efficient processes, precise equipment, complete process control, wide range of application industries fully demonstrate the irreplaceable value of centerless grinding in modern manufacturing, and also ensure that customers can obtain long-term stable and reliable micrometer-level processing accuracy in large-scale production.
