Improve structure of hob core axis to raise blade to grind quality

Nut 2.

Fill up 3.

Hob 4.

Columnar core axis pursues 11.

Nut 2.

Fixed position is filled up 3.

Fill up 4.

Hob 5.

Fixed position is filled up 6.

Nut 7.

Cone-shaped core axis pursues of red-letter day of week of chamfer of 2 looks bits the biggest accumulate error requirement; The knife before hob is faced inside the parallelism requirement of aperture axes; Error of radial of face of the knife before hob asks. Well-known, the teeth shape error of gear hobbing gear basically depends on hob precision. To reduce noise of gear clench the teeth, raise precision of clench the teeth, must reduce gear teeth shape error. The parallelism of axes of the aperture inside face of the knife before the diameter tropism of knife face is mixed before and hob, can assure through adjusting hob blade grinder. And the influencing factor that hob contains red-letter day of bits chamfer week to accumulate an error, what the graduation error that basically wears device of machine tool graduation by blade, hob installs is prejudicial (grind core axis to decide by the blade of the hob that hold clip) , the technical level of handlers will decide, after deciding in the technical level of machine tool precision, handlers, the blade that holds clip hob ground core axis to become the main factor that affects this error. Blade of my factory hob is ground is undertake on grinder of MG6425 hob blade, precision of this machine tool is taller, if the graph is shown 1 times,the outfit that face of the knife before its blade grinds hob uses places core axis. With axis of this kind of core (columnar core axis) the hob that hold clip, because the Kong Yuxin inside hob is existing to cooperate clearance between the axis, existing namely fiducial position error. As a result of the existence of fiducial position error, the Zhou Jie that bits chamfer allows after inevitable effect is ground to hob blade accumulates an error. The hob that supplies on the market at present mostly inside aperture precision on the low side, after increasing use period of time inside aperture wears away, have a lot of hob aperture out of tolerance, and with the graph a shown columnar core axis cannot remove the aperture inside hob and core rod cooperate clearance, the out of tolerance of gear tooth form that makes partial hob boils, short of our use requirement. Be aimed at afore-mentioned circumstances, the improvement that we undertook is like a graph 2 are shown to the structure of core axis. Axis of this taper core used 1:4The taper of 000, have fixed position to the aperture inside hob with its, in order to remove the aperture inside hob and core rod between cooperate clearance, because the taper of axis of this kind of core is bigger, be pressed when clamp to prevent hob inclined, core axis two end carry out axial fixed position to hob with fixed position mat. Of fixed position mat and part of core axis cylinder cooperate clearance to be less than 0.

01mm, end panel the conic and columnar part of core axis is jumpy, jumpy all should be less than 0.

005mm. When using the core axis after improving to install clip hob, load hob core axis cone first, the take advantage of an opportunity that use a hand is pushed close, pigheaded use right end nut, drive the right termination of the fixed position mat of right and hob to touch, twist next move left nut, drive Zun Duan to locate impaction of mat general hob. After grinding core axis via using the blade after improving, the item of week of the chamfer that hold bit that removed because of clearance generation basically accumulates an error, the blade of face of the knife before hob ground precision to rise, made sure blade grinds quality, reduced the teeth shape error of gear thereby. The product quality that treatment gives is stable, precision satisfied design requirement. CNC Milling