The key of CNC lathe type hydraulic chuck is divided into two categories: a variety of hydraulic chuck, suitable for disk parts and short shaft parts processing fixture; Center hole, centering accurate positioning of the workpiece assembly fixture, suitable for large length specifications or more production processes of shaft parts. Numerical control turning processing fixture should have a high precision and stiffness, compact structure, strong practicability, is conducive to the installation of numerical control lathe fixture and fast loading and unloading of handling parts, automation technology and other features.
1, a variety of hydraulic chuck jig in CNC lathe processing, most of the situation is the use of the workpiece or blank room of the inner hole accurate positioning, the following jig are by the round up positioning jig.
Three jaw chuck (1) Three jaw chuck characteristics Three jaw chuck is a common CNC lathe universal fixture, three jaw chuck is characterized by automatic centering, wide clamping range, faster clamping speed, but there is a deviation of centering precision, not suitable for the secondary clamping of the workpiece with higher parallelism requirements. In order to avoid easy deformation and vibration of the workpiece during milling, which will affect the production and processing quality, when the workpiece is installed in the three-jaw self-centering chuck, the overhang length should not be too much.
For example: the inner diameter of the part is less than 30 mm, then his overhang length should not be greater than 3 times the diameter; If the inner diameter of the part is >30 mm, his overhang length should not be greater than 4 times the diameter. At the same time, it can also prevent the workpiece from being bent and falling by the lathe tool top, causing the safety accident of punching. (2) There are two common standard hydraulic chuck chuck claws for CNC lathes, which are hard chuck claws and soft chuck claws.
2. When the chuck claw is clamped on the surface of refined gold, such as the surface of cast parts or non-smooth round rods, a larger clamping force is necessary, the hard chuck claw is used; In general, in order to ensure stiffness and wear resistance, hard chuck claws need to be heat treated, and the strength is relatively high. When you want to reduce the aperture flutter error of 2 or more parts, and when you have produced a processing table and do not want to have a pinch mark, you should choose a soft chuck claw. Soft chuck jaw is generally manufactured with high carbon steel, soft jaw before use, in order to cooperate with the production of the workpiece, need to be boring processing. After the clamping of the chuck soft claw and raw claw, the workpiece can still maintain a certain repeatability accuracy after several clamping.