Dalian precision machining plays an important role in modern industrial production, producing high-precision and high-quality components and equipment that are widely used in various fields. Through continuous technological innovation and equipment updates, the precision machining industry continues to grow and provide strong support for industrial manufacturing.

High precision is a significant characteristic of precision machining. Through advanced processing equipment and precise measuring tools, complex shapes and high-precision dimensions can be machined. For example, in the processing of optical lenses, the surface shape accuracy can reach the sub micron level, and the surface roughness can be controlled at the nanometer level to ensure the optical performance of the lens.

What are the commonly used processing equipment for precision machining in Dalian?

Lathe type

Precision CNC lathe:

Characteristics and Applications: Precision CNC lathes are key equipment used in precision machining for the processing of rotating parts. It has a high-precision spindle and feed system, which can accurately control the motion trajectory of the tool. Its spindle rotation accuracy can reach micrometer level, for example, when machining precision shaft parts, it can ensure the cylindricity and dimensional accuracy of the shaft. Numerical control systems can achieve complex programming and process various shapes such as threads, conical surfaces, and arcs. Used in the aerospace industry for processing shaft parts of engines, and in automotive manufacturing for processing crankshafts, half shafts, etc.

Typical models and performance parameters: For example, a certain brand of precision CNC lathe can achieve a maximum turning diameter of 600mm on the bed and 350mm on the tool holder. The repeated positioning accuracy of the X-axis/Z-axis can reach ± 0.002mm/± 0.003mm, which can meet the processing requirements of most precision rotary parts.

Hearthstone lathe (longitudinal cutting lathe):

Features and Applications: The center of gravity lathe is mainly used for machining slender shaft parts. It uses a rod material to pass through the spindle hole, and the tool performs cutting in both axial and radial directions simultaneously. One clamping can complete multiple processes, with high machining accuracy and efficiency. Especially suitable for processing small precision parts, such as needle parts in medical devices and small shafts in electronic equipment, it can effectively ensure the dimensional accuracy and surface quality of the parts.

Typical models and performance parameters: Some radial lathes have a maximum machining diameter of about 20mm and a spindle speed of over 10000r/min, which can achieve high-speed and high-precision machining. For example, its machining accuracy can be controlled within ± 0.01mm in the diameter direction and within ± 0.02mm in the length direction.

Milling machine category

Precision CNC milling machine:

Features and Applications: Precision CNC milling machines can control the movement of cutting tools in the X, Y, and Z coordinate axes through CNC programs, achieving machining of various shapes such as planes, grooves, and surfaces. It has high precision, with positioning accuracy up to micrometer level, and is widely used in the field of mold manufacturing for processing complex shapes such as mold cavities and cores. In the aerospace field, it is used to process the connection parts of aircraft structural components.

Typical models and performance parameters: The worktable size of a certain model of precision CNC milling machine is 1000mm × 500mm, with X, Y, and Z axis strokes of 800mm, 500mm, and 500mm respectively. The positioning accuracy is ± 0.005mm, and the repeated positioning accuracy is ± 0.003mm, which can meet the milling requirements of medium-sized precision parts.

Five axis linkage machining center (including milling function):

Features and Applications: The five axis linkage machining center is a high-end precision machining equipment that can simultaneously control the movement of cutting tools on the X, Y, Z, A, C (or B) five coordinate axes, and can machine parts with complex spatial surfaces. Plays a crucial role in the machining of complex parts such as aircraft engine blades and marine propellers. It reduces the number of clamping times for parts, improves machining accuracy and efficiency, and can produce more complex geometric shapes.

Typical models and performance parameters: The positioning accuracy of some advanced five axis linkage machining centers can reach ± 0.005mm, and the repeated positioning accuracy can reach ± 0.003mm. The maximum load-bearing capacity on its workbench can reach several tons, which can meet the processing needs of large, complex, and precision parts. For example, when processing large aircraft engine blades, the machining accuracy can achieve a surface accuracy of within ± 0.05mm.

Grinding machine class

Precision cylindrical grinder:

Features and Applications: Precision cylindrical grinding machines are mainly used for machining the outer surface of cylindrical workpieces. It precisely controls the grinding amount through the relative motion between the grinding wheel and the workpiece, and can control the dimensional accuracy of the workpiece at the micrometer level, with a surface roughness of Ra0.8-Ra0.2 μ m. Commonly used in the machining of high-precision shaft parts in mechanical manufacturing, such as machine tool spindles, motor shafts, etc., to ensure the dimensional accuracy and surface quality of the shaft, improve the rotational accuracy and service life of the shaft.

Typical model and performance parameters: A typical precision cylindrical grinder, with a maximum grinding diameter of about 320mm and a grinding length of about 1000mm. The linear speed of the grinding wheel can reach over 35m/s, and the positioning accuracy of the X-axis (lateral feed) and Z-axis (longitudinal feed) can reach ± 0.002mm, with a repeated positioning accuracy of ± 0.001mm, enabling high-precision outer circle grinding.

Precision internal grinding machine:

Features and Applications: Precision internal grinder is used for machining cylindrical holes. Its grinding wheel rotates at high speed inside the hole and makes relative feed motion with the workpiece, which can process high-precision inner holes. Widely used in the machining of automotive engine cylinders, hydraulic cylinders, and other parts, it ensures the cylindricity, straightness, and dimensional accuracy of the inner hole, thereby improving the performance and quality of these parts.

Typical models and performance parameters: The maximum grinding aperture of a certain internal grinder can reach 200mm, and the minimum grinding aperture can be around 5mm. The positioning accuracy of its X-axis (lateral feed) and Z-axis (longitudinal feed) can reach ± 0.002mm, and the repeated positioning accuracy can reach ± 0.001mm, which can meet the grinding requirements of high-precision inner holes of different sizes.

The process of precision machining can be divided into multiple steps, including design, machining preparation, machining, inspection, assembly, etc. According to customer needs and design requirements, engineers will design drawings and process flow for components. Then, the operator prepares the tools, materials, and equipment required for processing based on these design drawings. Next, precise cutting and machining of the parts will be carried out using precision machine tools and other equipment to ensure the accuracy of their dimensions and shapes. After processing, strict inspection and measurement are required to ensure that the parts meet the design requirements. Assemble the processed components into the final product.

Hard alloy cutting tools have high hardness, high wear resistance, and good thermal stability. In precision cutting, it is possible to maintain the sharpness of the cutting edge of the tool and reduce the impact of tool wear on machining accuracy. For example, in high-speed milling, hard alloy milling cutters can withstand higher cutting speeds and feed rates, improving machining efficiency and accuracy.