What are the characteristics of soft grip and hard grip in CNC machining?

If you don't have a deep understanding of CNC machining, you don't necessarily know that there are soft grasping and hard grasping. The experience of many years of CNC machining masters has been summarized and hard knowledge points.

The parts used in the chuck of the lathe responsible for the clamping and clamping of the workpiece are called jaws. The machine tool accessories used for clamping and positioning are low-carbon steel for soft gripping and hardened steel for hard gripping. Most of them are evenly distributed in 360 degrees, so that the three jaws can approach or withdraw from the center to complete the processing of precision parts at the same time.

Soft gripping: The gripping jaws that have not been heat-treated or tempered by CNC machining are usually soft gripping. The feature of soft jaw clamping is that the workpiece can maintain the accuracy of a certain position even after multiple clampings, which greatly shortens the clamping of the workpiece The correction time is usually used to fix the workpieces whose surface is easy to be scratched to ensure the positioning of the coaxiality and length, and to prevent the occurrence of clamping marks during the clamping process.

Hard claw: The material will be harder after heat treatment. The Rockwell hardness reaches 48 or more. It has the characteristics of sturdiness and durability. For workpieces that are not very demanding for CNC machining, they are usually hard gripped. Generally, rough machining workpieces are as follows: Use hard jaws when car bar stock, car blank, etc. require large clamping force; usually to ensure rigidity and wear resistance.

Soft grip and hard grip have their corresponding characteristics. When processing workpieces of different materials or different requirements, the use of corresponding jaws can often reduce defects in the processed workpiece.