When processing molds on the VMC850 vertical machining center, it is very important to reasonably control the speed, especially when high-speed cutting or fine processing is required. Here are some suggestions:

1. Tool selection: The vertical machining center selects tools suitable for high-speed cutting, usually using carbide tools or coated tools to improve the wear resistance and thermal stability of the tools.

2. Appropriate cutting speed: The vertical machining center selects an appropriate cutting speed based on the characteristics of the material and tool. When vertical machining centers perform high-speed cutting, the cutting speed is usually higher, but it needs to be kept within the range that the tool and workpiece material can withstand.

3. Cooling system: The vertical machining center ensures the normal operation of the cooling system and keeps the temperature of the tool and workpiece within the appropriate range to prevent tool wear and workpiece deformation caused by overheating.

4. Stable workpiece clamping: Ensure that the workpiece clamping of the vertical machining center is firm and stable to prevent processing errors caused by vibration. When the vertical machining center is cutting at high speed, vibration can easily affect the quality and accuracy of the machined surface.

5. CNC programming optimization: The vertical machining center optimizes CNC programming and adopts reasonable cutting paths and cutting strategies to reduce cutting transitions and improve cutting efficiency.

6. Appropriate cutting depth and feed speed: During high-speed cutting, the vertical machining center should appropriately adjust the cutting depth and feed speed to ensure that the vertical machining center can maintain a stable cutting process under high-speed operation.

7. Detection and adjustment: The vertical machining center regularly detects and adjusts the machine tool to ensure the accuracy of each component to improve the overall processing accuracy.

8. Fine processing parameter settings: For mold processing that requires extremely high precision, processing parameters need to be set more precisely, such as improving interpolation accuracy and reducing cutting impact.

When the vertical machining center performs high-speed cutting, these parameters need to be adjusted according to the specific situation, and trial cutting and adjustment are gradually carried out to achieve the best processing effect and processing accuracy. In addition, operators need to have relevant processing experience and skills to ensure safety and stability during high-speed cutting.