Dentiform other machines a method

8~0.

4µm. Shave tine is belonged to on the principle exhibit law treatment. The figure of shave tine knife is similar helix gear, tooth form is done very well and truly, on tooth flank edge involute direction leaves have a lot of canaliculus chamfer in order to form cutting blade (1a seeing a picture) . Age when shave knife and when be being run by treatment gear clench the teeth, the numerous cutting blade on face of shave tine tooth will fall from the shave on workpiece tooth flank filamentous cut bits, make tooth form precision rises to be worth with tooth flank surface roughness reduce. Graph the athletic form of the workpiece when knife of 1 shave tine and tine of shave of shave tine principle are machined and cutting tool sees graph 1b. Workpiece installation is on arbor, by shave tine knife is driven rotate, because shave ages knife tooth is,tilt (helix angle is β ) , to make it as can correct as workpiece clench the teeth, must make its axes photograph tilts to workpiece axes horn of a β . When shave ages, the A of circumferential speed υ that shave ages the knife nods A in clench the teeth can decompose the workpiece that it is an edge tangential speed υ An and At of υ of speed of edge workpiece axial, υ An makes workpiece rotates, υ At is tooth flank opposite sliding velocity, namely shave tine speed. Cut the whole facewidth of workpiece for shave, workpiece should drive move back and forth to move point-blank by workbench. Workbench every time when end of journey of move back and forth, shave ages radial of knife edge workpiece makes feed motion, make workpiece tooth flank is gone to be about by shave every time 0.

007~0.

The metal of 03mm. The course is cut in shave in, shave ages knife from time to time is turning, shave cuts a profile of teeth of a cogwheel; From time to time inverts, shave cuts another profile of teeth of a cogwheel. Shave ages treatment basically is used at raising tooth form precision and teeth directional precision, reduce tooth flank surface roughness to be worth. Shave tine cannot correct the error that divide tine. Precision of the gear after shave can amount to 7~6 class, ra value is exterior surface roughness 0.

8~0.

2µm.

Shave tine basically is used at be being mixed group by group mass-produced in finish machining tooth flank not the straight tine with hard temper by dipping in water and gear of inclined tine cylinder. 2. Roll flute roll flute is to use emery wheel to be opposite on machine of special roll flute a kind of method that already quenched gear has precision work. Roll flute can be divided by treatment principle mix for figuration law extend a law two kinds. (1) roll flute of law of figuration of figuration law roll flute and the principle that figuration law mill ages are same, sectional appearance nap becomes emery wheel to age with the gear that be ground groove agrees, the working state when roll flute and dish situation of job of tine of mill of shape milling cutter is similar, if pursue,2 are shown. Graph the dividing movement when roll flute of roll flute of 2 figuration law is discontinuous, graduation must undertake after wearing a tooth, wear next tooth again, treatment of one by one comes out teeth of a cogwheel. Figuration law roll flute because emery wheel can grinding gives whole involute tooth flank, reason productivity is tall, but the effect that suffers precision of emery wheel nap and precision of machine tool graduation, its treatment precision is inferior (6~5 class) , aborning application is less. (2) exhibiting law roll flute is the face of Cheng Zhui of grinding part nap emery wheel (3b seeing a picture) , in order to constitute the tooth flank of fictitious rack. When grinding, emery wheel makes high speed whirligig (advocate motion) , at the same time edge workpiece axial makes move back and forth move point-blank, in order to grind a widths over teeth. Workpiece secures rack strictly to make the way of pure scroll according to one gear edge, rotational, edge moves by the side of, grind early or late to tine top direction from tine root give alveolar two flank. Emery wheel is retreated later from workpiece, machine tool index mechanism undertakes graduation, make workpiece has turned a tine, the tooth flank with grinding alveolar the next, repeat afore-mentioned loops so, till grind complete ministry alveolar tooth flank. Graph 3 exhibit precision of roll flute of emery wheel of cone of law roll flute to be able to amount to 6~4 class, ra value is tooth flank surface roughness 0.

4~0.

2µm. Basically use at sheet, pre production the temper by dipping in water with very high demand of precision of medium, treatment hard or blame temper by dipping in water is hard gear. If tilt emery wheel of two dish form,become proper point of view, two when with making a supposition rack ages twice outside flank, undertake grinding to two tooth flank of gear teeth of a cogwheel at the same time (graph 3a) , its principle ibid narrates roll flute of cone emery wheel identical. Method of this kind of roll flute, treatment precision is tall (highest can amount to 3 class) , Ra value is tooth flank surface roughness 0.

4~0.

2µm. But what use equipment structure complex, cost tall, productivity is low, reason application is not wide. 3. When the top gem ages when workpiece hardness exceeds HRC35, tine of use top gem replaces shave tine. Top gem tine is a kind of method that undertakes with gear of honing wheel pair on honing machine finishing is machined, its principle and motion and shave tine are identical. Honing annulus is to use corundum and epoxy resin to wait pouring or hot pressing and the become helical gear that has precision of taller tooth form, its hardness is extremely tall, its appearance structure and shave tine knife are similar, the chamfer that hold bit just is not had on tooth flank, rely on to grind bead to undertake cutting. When honing, honing annulus rotate speed is high (it is 1000~2000r/min about) , can arise along teeth directional and involute direction at the same time slip undertake successive cutting, productivity is tall. Honing process is had grind, the integrated action such as shave, polish. Top gem tine is not big to improvement of tooth form precision, after basically be being used at shave to age, need to quench the finish machining of gear, can purify oxidation skin, burr, the surface roughness of surface of teeth of a cogwheel after improving heat treatment (Ra value is 0.

4~0.

2µm) . Top gem tine also can be used at be not temper by dipping in water hard gear cutting. CNC Milling