English Author: Site Editor Publish Time: 2025-12-12 Origin: Site
The most commonly used methods for clamping workpieces on CNC milling machines are as follows:
1. Bench vise clamping : suitable for regular small workpieces, it is convenient to clamp and accurately position, but the clamping force is relatively small, and it is not suitable for thin plate parts.
2. Clamping with pressure plate and bolts : It is used for large-sized or irregular workpieces. By pressing with a pressure plate, the clamping is stable but the alignment takes a relatively long time. It is necessary to avoid the processing area .
3. Three-jaw chuck clamping : Specifically designed for cylindrical workpieces, it can automatically center and clamp quickly, but the clamping force is limited. For long workpieces, attention should be paid to alignment.
4. Indexing head clamping : It is used for workpieces that require circumferential indexing or angular processing, and can precisely control the rotation Angle.
5. Other methods : such as strong magnetic tables (with adsorbable materials), vacuum suction cups (suitable for large planes), combined fixtures (high flexibility), etc. Users can choose according to specific needs.
Clamping the workpiece is a very crucial step in the operation of a CNC milling machine, directly related to the processing quality and personal safety. Special attention should be paid to the following points
1. Preparations before clamping
Check the machine tool condition : Ensure that the lubrication system is normal, the cutting tools are firmly fixed, and the machine tool is in good working condition.
Clean the workbench and fixtures : Remove dust, oil stains and other impurities to ensure that the clamping surface is clean and avoid affecting accuracy and stability.
2. Safe operation during clamping
must be shut down for operation : when clamping workpieces, tools or conducting measurements, the machine tool must be completely stopped. It is strictly prohibited to perform operations while the machine is in operation.
Select the appropriate fixture : Choose based on the shape and size of the workpiece to ensure stable fixation and prevent displacement or deformation during processing.
Check the fixture condition : confirm that the fixture is undamaged or worn and can provide sufficient rigidity and clamping force.
Ensure good contact between the workpiece and the reference surface : Use appropriate supports to reduce deformation and displacement and improve machining accuracy.
Apply clamping force evenly : avoid local over-tightening which may cause workpiece deformation, or over-loosening which may affect machining accuracy.
Avoid collision and interference : Plan the clamping position reasonably to prevent collision between the tool, fixture and workpiece.
3. Other important safety matters
Dress code : Tight-fitting work clothes must be worn with cuffs fastened. Gloves are strictly prohibited. Female workers must wear safety helmets.
Do not remove chips by hand : a brush must be used. Do not blow directly by hand or mouth.
stay focused : Concentrate your mind during operation and do not leave your post without permission.
Regular inspection : During the processing, the clamping status should be inspected regularly. Any abnormalities found should be adjusted promptly.
