Sanluo Precision is a professional turning machining manufacturer and supplier in China, providing comprehensive customized services to global customers. It supports the customization of complex and difficult parts. The company is equipped with multiple ordinary lathes, suitable for single-piece and small-batch processing; 40 CNC lathes, suitable for high-precision batch processing; 15 turning-milling centers, capable of completing multiple processes such as turning, milling, drilling and tapping in one setup; 5 automatic lathes, suitable for the production of simple parts in large quantities. Our customized services cover processes such as outer cylindrical turning, inner hole turning, end face turning, slotting turning, thread turning (metric / imperial / American / trapezoidal), and forming turning, and can process various parts with diameters ranging from φ0.3mm to φ100mm. Through reasonable tool configuration and process optimization, we ensure the efficiency and quality of the processing.
Sanluo Precision focuses on five core processes: facing machining, CNC Mill Turn, Mill Turn Machining, Precision Turning Machining and CNC Turning, providing professional customized services for the mechanical manufacturing, aerospace, mold processing, semiconductor, precision instruments and other industries. It supports the customization of complex and difficult parts, with an annual processing volume of millions of pieces and a qualification rate of 99.5%.
Each process of the company strictly controls the accuracy, with the position size accuracy reaching ±0.002mm or above, and the shape accuracy is stable and reliable. The production capacity covers 1 to 999,999 pieces, and the production cycle is 3 to 20 days. The end face processing strictly controls the flatness and perpendicularity, and is equipped with special equipment such as SGR-700SP and KG-500; the turning-milling processes achieve multi-process processing in one setup, with an efficiency increase of 30% to 70%, and are equipped with imported five-axis equipment such as MAZAK and DMG MORI; precision turning machining has 18 years of technical accumulation, with a precision reaching micrometer level, and a surface roughness as low as Ra0.05μm.
The company is equipped with a complete set of inspection equipment such as CMM three-coordinate measuring machines and laser interferometers, has established a strict quality control system, combines advanced numerical control systems and patented technologies, realizes efficient, high-precision and stable processing, and at the same time, with the advantages of equipment, technical team support and ISO9001 system guarantee, provides global customers with all-round and customized precision processing services.
Sanluo Precision's turning machining utilizes the principle of rotating workpieces and tool feed to complete processing of external circles, internal holes, end faces, threads, slots, and formed surfaces. It is suitable for shafts, discs, and sleeve-type parts, including smooth shafts, stepped shafts, threaded shafts, eccentric shafts, crankshafts, flanges, gear blanks, shaft sleeves, etc. The processing capacity ranges from φ0.3 to 300mm in diameter and is limited to a length of ≤1000mm. It can cover everything from small precision shafts to the main shafts of large equipment. The general turning accuracy can reach IT1–IT10 level (approximately ±0.002 to 0.01mm), while the precision turning can reach IT0–IT8 level (approximately ±0.001 to 0.003mm). The surface roughness is generally Ra0.2 to 1.3μm, and the precision turning can be controlled within Ra0.2 to 1.2μm, providing a reliable blank foundation for subsequent fine grinding and assembly.
We not only have general manual lathes, but also layered configuration of various CNC turning machines. Therefore, turning machining can simultaneously cater to both prototype and batch production. The Sanluo Precision factory has ordinary lathes (φ20～300mm, length ≤ 500mm), suitable for flexible processing of single pieces and small batches; CNC lathes with diameters ranging from φ6 to 200mm have automatic cycles and high efficiency, suitable for mass production; the turning center is equipped with C-axis, Y-axis and power tools, enabling turning-milling integration, completing multiple processes with one setup, reducing clamping errors; large vertical lathes and horizontal lathes can process heavy parts with a diameter of ≤ 500mm, such as pump shells, water turbines, and ship components. Combined with CNC systems like FANUC, SIEMENS, and Fanuc Numerical Control, it realizes automatic processing of complex contours, taper, arcs and curves, forming a complete capability gradient for precision CNC machining and turning machining within the same factory.
Reasonable setting of rough and fine cutting parameters will result in stable external circle, inner hole and thread quality. In the Sanluo Precision processing plant, for external cylindrical, external conical and formed surface, the roundness of φ5 to 100mm can be controlled within 0.01 to 0.05mm, and the cylindricality is 0.02 to 0.03mm; for inner hole turning, the coverage hole diameter is φ10 to 200mm, the depth is ≤ 500mm, the roundness is approximately 0.01mm, and the surface roughness is around Ra0.8μm; for end face turning, the flatness is approximately 0.01mm and the perpendicularity is approximately 0.01mm. For thread turning, it can process triangular threads, trapezoidal threads, and sawtooth threads, with a pitch of 0.5 to 12mm, a middle diameter accuracy of 4–8 grades, and the tooth profile angle is controlled within ±30'. In the rough turning stage, the cutting depth ap = 2–5mm, the feed f = 0.3–0.8mm/r, and the rotational speed n = 200–600rpm to quickly remove the excess material; in the fine turning stage, ap = 0.5–1mm, f = 0.1–0.3mm/r, and n = 400–1200rpm, taking into account both efficiency and surface quality under the principle of accurate machining.
We have fully entered the processing services of key industry core components. Sanluo Precision has mature technologies in CNC milling turning, facing machining, milling turning machining, and precision turning machining. High-precision machining has been applied in multiple industries: in mechanical manufacturing, for example, 45# steel transmission shafts with an outer diameter ranging from 30mm to 200mm and roundness of approximately 0.002mm, concentricity of 0.01mm, surface roughness of Ra0.4μm, after rough machining and then fine grinding; for HT250 shaft sleeves with an inner diameter ranging from 50mm to 300mm, with a fit tolerance of H8 grade, flat end faces; for carbon steel flange end face turning with a flatness of 0.005mm, and good coaxiality of the hole system and the outer circle. In the industrial field, for ductile iron crankshafts, after turning the outer circle and end faces, they undergo fine grinding and dynamic balance to reach G6.3 grade; for gray cast iron brake drums, after turning the inner and end faces, the dimensional accuracy is approximately ±0.01mm.
In the energy equipment sector, for stainless steel 304 pump shafts with an outer diameter ranging from 80mm to 300mm and roundness of approximately 0.01mm, surface roughness of Ra0.4μm, considering both corrosion resistance and strength; for the inner and thread of valve body cast steel parts after turning, the sealing surfaces are turned to Ra0.4μm to meet the sealing requirements. In precision instrument applications, for alloy steel precision spindles, the outer circle turning accuracy is approximately ±0.002mm, roundness 0.005mm, and then combined with grinding to achieve IT6 grade; for the outer circle and thread of 45# steel screw rod turning to IT8 grade, laying the foundation for subsequent fine grinding of the thread. Sanluo Precision has provided customized services to customers such as Huawei and BYD, producing tens of thousands of turned parts annually, and has become a reliable turning machining manufacturer and supplier in China, with stable quality, timely delivery, and reasonable costs.
