VMC-850 Machining center

The VMC-850 machining center is a common vertical machining center with the following features:
1. Structural Design:
- Overall Layout: It adopts a vertical frame layout, with the column fixed on the bed, and the spindle box moving up and down along the column (Z-axis), the slide seat moving longitudinally along the bed (Y-axis), and the worktable moving laterally along the slide seat (X-axis). This structural design ensures good stability and rigidity during the machining process, enabling the machine to withstand large cutting forces.
- Large Components: The bed, worktable, slide seat, column, and spindle box are usually made of resin sand castings and undergo two stages of stress relief treatment to eliminate stress, ensuring good stability and high strength, thus maintaining the accuracy stability of the machine over a long period of use.
2. Motion System:
- Guides: The X, Y, and Z-axis guide pairs mostly use widened rectangular sliding guides or large-sized heavy-duty imported linear guides. The sliding guides undergo medium-frequency quenching and precise grinding. The guide surfaces are coated with composite PTFE material and precisely scraped and ground, combined with automatic forced centralized lubrication, which can reduce the friction resistance of the feed motion, reduce low-speed crawling, and improve the machine's accuracy and lifespan; the linear guides have high motion accuracy and speed.
- Spindles: The ball screws for X, Y, and Z axes are generally C3 grade double-magnet-preloaded ball screws. The bearings at both ends of the ball screws use imported P4 grade 60 contact angle spindle-specific bearings, and the spindle supports adopt a pre-stretched structure, reducing the thermal deformation impact on the accuracy during long-term operation of the machine.
- Motors: Each axis is driven by a large-torque AC servo motor, enabling fast, smooth, and seamless movement of each axis, with high positioning accuracy and repeat positioning accuracy.
3. Spindle System:
- Spindle Performance: It is usually equipped with a high-speed, high-precision, and high-rigidity spindle unit. The spindle speed range is wide, generally ranging from 50 to 8000 r/min or even higher (some can reach above 10000 r/min), and can achieve stepless speed regulation within this range. The important components are strengthened and use world-renowned brand P4 grade spindle-specific bearings and high-quality lubricating grease for lubrication. The entire spindle is assembled under constant temperature conditions and undergoes computer balancing correction and running-in tests, ensuring long service life and high reliability.
- Spindle Function: The spindle uses motor-integrated encoders for control, enabling spindle orientation and rigid tapping functions. Moreover, the spindle adopts a center blowing air structure. After the spindle loosens the tool, the center high-pressure gas quickly cleans the inner cone of the spindle to ensure the accuracy of tool clamping.
4. Tool Magazine System:
- Tool Magazine Type: Common types include hat-shaped tool magazine and disc-shaped tool magazine. The tool magazine capacity is generally 16 or 24 pieces. The hat-shaped tool magazine has a damping structure, reducing the impact during movement and ensuring the service life of the tool magazine; the disc-shaped tool magazine has accurate tool changing, short changing time, and high efficiency, and has passed millions of times of operation tests, meeting reliability requirements.
- Tool Changing Speed: The tool changing speed is fast, meeting the requirements of efficient processing, and the tool changing time of the disc-shaped tool magazine is generally within a few seconds.
5. Control System: It can be equipped with various CNC systems, such as Siemens, Fanuc, Mitsubishi, and Fanuc, allowing users to choose according to their own needs. These CNC systems have powerful computing capabilities and data processing capabilities, enabling the processing of complex parts and supporting functions such as multi-language programming and intelligent path optimization.
6. Processing Capacity:
- Processing Range: It is suitable for processing various complex-shaped parts, such as box-type parts, disc-type parts, shaft-type parts, etc., and can perform milling, drilling, boring, tapping, and other processing operations.
- Processing Accuracy: The positioning accuracy is generally within ±0.005mm to ±0.02mm, and the repeat positioning accuracy is within ±0.003mm to ±0.008mm, meeting the processing requirements for high-precision parts.
7. Machine Guarding and Lubrication: - Protection: The machine tool adopts a protective enclosure that complies with safety standards. It not only prevents coolant from splashing but also ensures operational safety and an attractive appearance. Each guide rail of the machine tool is equipped with a protective cover to prevent chips and coolant from entering the machine interior, thus protecting the guide rails and ball screw from wear and corrosion.
- Lubrication: The guide rails, ball screw pairs, and supporting bearings all use centralized automatic thin oil lubrication. Each node is equipped with a quantitative oil distributor, which injects oil into each lubrication area at regular intervals and quantities to ensure uniform lubrication of the sliding surfaces, reduce friction resistance, improve motion accuracy, and extend the service life of the ball screw pairs and guide rails.
Different manufacturers' VMC-850 machining centers may vary in specific parameters and configurations, but in general, the VMC-850 machining center has high processing accuracy, efficiency, and stability, and is one of the commonly used equipment in the mechanical processing industry.