1Keyway classification and general processing methods
The slot in which the key is installed is called the keyway, and the keyway includes: open type, semi-open type, and closed type. Open and semi-open type with disc groove milling cutter, high efficiency. There are two types of keyways for shaft parts: open type and closed type. For closed keyways, single-piece production is typically machined on a vertical milling machine. When the batch is large, it is often processed on a keyway milling machine. When machining on a keyway milling machine, the workpiece is clamped with a flat-nose pliers, and then the keyway milling cutter is used to mill a thin layer and a thin layer. until the requirements are met.
1.1 Milling the closed keyway with an end mill to mill a semi-closed slot, the diameter of the selected tool should be equal to or less than the width of the slot, due to the force during pin milling, the end mill is easy to yield when the rigidity is poor, and excessive force may cause milling The knife is broken, and the layered milling method is milled to the size, and the knife is raised outside the expanded milling groove, and the knife cannot be raised back and forth outside the groove. Climb milling should be avoided when enlarging the slot to avoid gnawing the workpiece.
1.2 Use an end mill to mill the half-through keyway. Use an end mill to expand and mill the half-through keyway. It is not possible to mill the through slot with vertical feed. Drill holes first, then use an end mill smaller than the width of the slot, and then use a milling tool equal to the width of the slot. The cutter is milled to the required width or the cutter is milling. When expanding the milling, prevent down milling and fasten the direction that is not used at any time.
There are four methods for milling closed keyway: ① measure with vernier caliper; ② use sticker method; ③ cut mark method; ④ knife gauge method.
1.3 Milling open keyway with three-sided edge The three-sided edge is generally used to process right-angle grooves and stepped parts, but sometimes we can also use it to process open time slots. The processing method is equivalent to the processing method of right-angle grooves and stepped parts. The difference is that when setting the tool on the side, care should be taken not to scratch the workpiece, so as not to damage the quality of the workpiece. Cooling should be sufficient and timely to prevent the tool from being damaged by heat.
1.4 Milling the keyway with the keyway milling cutter The keyway milling cutter can process various types of keyways. When selecting the tool, it is necessary to pay attention to the trial cutting to prevent the error of the tool in the manufacturing process from making the keyway milling large. When milling, pay attention to the difference between down milling and up milling, and be careful not to cause broaching during down milling. In order to prevent knife cutting during cutting, we can make marks on the longitudinal table and horizontal table of the machine tool.
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