If it is used for a long time, the spring chuck wear exceeds a certain limit and there will be a phenomenon of unstable workpiece, which directly affects the processing accuracy and production efficiency, and the spring chuck is scrapped, which virtually increases the manufacturing cost of the fixture and causes huge economic losses. In order to improve the wear resistance of the chuck, it is necessary to increase the hardness of the chuck, and the hardness is too high, the elasticity of the chuck is weakened, and the spring flap is easy to break, and the block spring chuck is designed for this problem.
It is composed of two parts, one is the chuck body and the other is the clamp, which are connected by screws. The chuck body has six reed flaps, and the clamping and loosening action is completed by the elastic deformation of the spring flap when working, and the chuck body material is selected 65Mn, and the quenching hardness is 40~45HRC to ensure the elasticity of the chuck; The clamp block is installed in the claw of the chuck, directly in contact with the workpiece, the clamp is a wearable part, the clamp material can use GCr15, quenching hardness 60~62HRC to increase wear resistance. The block type spring chuck has had the following problems in use:
(1) Due to the manufacturing error of the chuck, it is easy to be eccentric, and the wall thickness difference will appear in the collar after turning.
(2) After the clamp block is arbitrarily loaded into the chuck, the roundness of the clamp block is not good, and the ferrule is clamped with such a clamp, and the wall thickness difference will also appear after processing. When manufacturing, you must find a way to overcome it.