What are the commonly used fixtures for precision parts processing disk parts
Precision parts are usually used to process small disk parts with three jaw self centering chucks for clamping workpieces. If the surface with location accuracy requirements cannot be processed during the installation of three jaw self centering chucks, usually after finishing the inner hole, the inner hole positioning installation mandrel or spring mandrel is used to process the outer circle or end face to ensure the location accuracy requirements. When processing large disk parts, because the three jaw self centering chucks are not so large in size, Therefore, the workpiece is often clamped with a four jaw single action chuck or a disc.
1. Spindle
When the workpiece uses the machined hole as the positioning reference and can ensure the coaxiality requirements of the outer circle axis and the inner hole axis, the mandrel can be used for clamping. This clamping method can ensure the coaxiality of the inner and outer surfaces of the workpiece, and is suitable for certain batch production.
There are many kinds of mandrels. The workpiece is usually positioned by a cylindrical hole with a circular mandrel and a small taper mandrel; For the positioning of workpieces with taper holes, threaded holes and spline holes, the corresponding taper mandrels, threaded mandrels and spline mandrels are commonly used. When positioning and clamping the taper mandrels or taper mandrels, pay attention to their contact with the workpieces.
2. Flower disc
The disc is a large disc mounted on the lathe spindle. Precision parts with irregular shape can be used to process workpieces. For workpieces that cannot be clamped with three jaw self centering or four jaw single action chuck, they can be clamped with a disc. It is also a common fixture for machining large disc sleeve parts. There are thousands of T-shaped grooves on the disk, which are used to install positioning elements, clamping elements, indexing elements and other auxiliary elements. It can process the outer circle, end face and inner hole of disk sleeve parts or eccentric parts with complex shapes.
When using the disc to clamp the precision parts to process the workpiece, pay attention to the balance, and use the balancing device to reduce the vibration generated by the high center and the wear of the main shaft bearing. Generally, there are two kinds of balancing measures: one is to add balancing weights (counterweights) on the heavier one, and the farther away from the high turning center, the better; the other is to machine the heavy hole on the heavier one, and the closer the position is to the turning center, the better. The position and weight of the balancing weights are best adjustable.