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The main factors and summary of the clamping force of high precision chuck
The pull rod exerts an axial pulling force on the high precision chuck. In the use of the high precision chuck, the axial pulling force can be applied in different ways, but the principle of action is basically the same.
Release time:
2022-01-14
The pull rod exerts an axial pulling force on the high precision chuck. In the use of the high precision chuck, the axial pulling force can be applied in different ways, but the principle of action is basically the same. Therefore a large axial pulling force will generate a large clamping force and vice versa. Generally, the axial tension of the tie rod can be adjusted on the CNC machine tool.
In the use of the high precision chuck, the locking angle of the chuck will determine the radial clamping force that the high precision chuck can provide under the same axial pulling force, which is usually manufactured by the machine tool manufacturer and the high precision chuck. business decision. The selection of the locking angle should be based on economy and reliability, and should be determined according to the type of machine tool, use conditions (dynamic and static) and use (workpiece and tool).
The friction between the workpiece (or tool) and the high precision chuck will directly affect the firmness of the clamping (but not the magnitude of the clamping force). The greater the frictional force, the firmer the workpiece is clamped, and vice versa. In order to overcome the relative rotation or axial movement between the high precision chuck and the workpiece (or tool), various measures can be taken during the manufacturing process of the high precision chuck to increase the friction force, such as intentionally making the inner hole of the high precision chuck Sawtooth shape or impregnation of carbide micro-grains on the clamping surface, etc.
The friction between the taper surface of the spindle and the high precision chuck at the locking angle. Its frictional force also directly affects the strength of the high precision chuck to the workpiece clamping force. When the friction force is too small, the clamping force is not enough, which will cause the relative rotation of the workpiece; and the clamping force that is too large will accelerate the wear of the high precision chuck.
In actual use, the high precision chuck needs to be loosened frequently to replace the workpiece. For example, it is used on a turning machining center. You can spray a layer of lubricant on the surface of the inner hole of the high precision chuck when loosening, and it is better to use coolant lubrication under conditions. Flushes debris from high precision chucks and provides excellent lubrication. Regular application of grease to the locking corners of high precision chucks can reduce long-term wear and increase clamping force. Other more lubricating materials can also be used, including high-quality greases or wax-based materials with EP (Extreme Pressure) properties.
Reasonable selection of the clamping diameter of the high precision chuck can ensure that the high precision chuck produces the maximum clamping force on the workpiece and achieves the best clamping state, thereby ensuring the high quality and high precision of machining. If the diameter of the inner hole of the high precision chuck is too large, the workpiece is only partially clamped by the orifice of the high precision chuck when the chuck is closed, which is likely to cause a geometric mismatch between the outer circle of the workpiece and the inner hole of the high precision chuck. Thus reducing the clamping force. If the diameter of the inner hole of the high precision chuck is too small, only the inner part of the inner hole of the chuck is in contact with the workpiece when the chuck is closed. Although the clamping force increases, it will cause the chuck and the workpiece to have different axes. A high precision chuck of one size can only clamp and position workpieces with corresponding diameters.
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2023-03-09
2023-02-28
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