The common right-angle grooves in precision parts machining are open, closed and semi-closed, of which the tail of the semi-closed groove has two forms: vertical milling cutter arc (vertical arc) and disc-type milling cutter arc (lying arc). The keyway on the shaft is a typical right-angle groove with a flat key coupling the shaft and the sleeve, and the special-shaped grooves milled on the milling machine are V-groove, T-groove, semi-circular keyway and dovetail groove, etc.
Machine tool guides, shaft parts are often positioned using V-grooves: T-grooves are mainly used to put on T-bolts, such as T-grooves on the machine table for putting on bolts to clamp the workpiece: dovetail fits are usually also used for machine tool guides, such as longitudinal and vertical guides for milling machines.
Right-angle groove and special-shaped groove milling technology requirements
(1) dimensional accuracy: the width, length and depth of the groove have certain dimensional accuracy requirements, especially for the parts that fit with other parts, the dimensional accuracy requirements are relatively high. Such as both sides of the keyway, because with the flat key, its width size tolerance is less than or equal to 0.052mm.
(2) shape accuracy: various shapes of grooves after milling precision parts processing, should meet the shape accuracy requirements of the drawings. Right-angle groove and special-shaped groove are composed of plane, therefore, usually have the basic requirements of flatness and straightness. Used to fit the plane, its shape requirements are higher, such as the key slot on both sides of the surface, T-slot benchmark straight groove on both sides of the surface, V-slot V-shaped surface, dovetail groove with the bevel and horizontal surface.
(3) positional accuracy: precision parts processing between the slot and the reference generally have positional accuracy requirements, such as the shaft key slot generally has a slot width size on the workpiece axis symmetry requirements, such as the T-slot middle plane and the reference side parallelism requirements, several T-slots between the parallelism requirements, in addition, the distribution of grooves on the shaft parts, there is equal precision or angle requirements.
(4) surface roughness: the surface roughness requirements for each surface of the composition of the groove, the surface used to fit requires a small surface roughness value, such as the benchtop T-slot benchmark straight groove on both sides of the surface is often used for fixture positioning, therefore requires a small surface roughness value.
