Manufacturing method of soft jaws of CNC lathe chuck
What is the chuck soft jaw of CNC lathe
The chuck soft jaw of CNC lathe is a device for clamping the workpiece. It is a relatively soft jaw that has not been heat-treated, and can be processed according to the shape of the workpiece to improve positioning accuracy²³. Soft claws have different specifications and shapes, such as 6" soft claws, 8" soft claws, 10" soft claws, thickened, widened, square, pointed soft claws, etc.
The use of chuck soft jaw
The soft claw can fit the surface of the workpiece to the greatest extent, which can not only ensure the transmission of greater torque, but also avoid the workpiece from being pinched. These advantages are incomparable to the hard claw. At present, many companies, including Soft Robotics and Empire Robotics, have begun to sell soft claws, which are expected to be used in earthquake search and rescue in the future. As a machinist, I remembered the soft claws used for machining.
How to Make Chuck Soft Jaws
Selection of soft claw material
The "soft" here means: good processing performance does not mean that it must be lower than the hardness of the workpiece. For mass production, the hardness of the soft jaws will have a great impact on the stability of processing. Choosing a soft jaw material with a hardness higher than that of the workpiece will not only improve the service life of the soft jaws, but also have a positive effect on the stability of processing. Impact.
The installation position of the soft jaw on the chuck
Any T-block exceeding the maximum diameter of the chuck is not allowed, which would be a great safety risk.
Pressure and position when using the jaw boring ring
It is recommended that the pressure during use is close to the pressure during workpiece processing. The chuck is in the middle of the range of motion during processing, and the direction of the clamping force when repairing the jaws is consistent with the direction of the workpiece clamping force.
Effect of chuck diameter and rotational speed on clamping force
Due to the effect of centrifugal force, when the chuck operates at high speed, the clamping force will be greatly reduced
Special Note:
Make the inner hole the same size as the diameter of the workpiece to reduce the possibility of pinching the workpiece.
Add undercuts to ensure repeated positioning of workpieces.
Remove the burrs and sharp corners on the soft claws (be careful not to scratch your hands).
Selection of soft jaw size.
Soft jaws should hold at least 1/3 of the length of the workpiece.
In summary, the role of the chuck soft jaw of the CNC lathe is to perform semi-finishing and finishing turning of the workpiece during mass production, so as to improve the repeated positioning accuracy and clamping firmness of the workpiece. The soft claw can be processed according to the shape of the workpiece, so that the diameter of the inner surface of the claw is the same as the diameter of the clamping part of the workpiece, increasing its contact area.
