Gear finish machining

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Mr Scholz (see a picture 1) point out: "Density is in the power of car engine to increase apparently in recent years. " will tell to car transmission, this means its place to bear to increase quickly ladenly. And the archives digit quantity that more serious is transmission is increasing also. Because the bulk of transmission and quality cannot continue to increase again, because while with respect to the requirement load increases, this reduces gear volume. The application in the transmission in modern car is most is involute cylinder helical gear (see a picture 2) . The carrying capacity of gear material already amounted to ü of Antoine T of leader of department of research and development of company of ultimate Gleason Hurth Dr. Rich (see a picture 3) say: "Will tell to the architect, this also means the gear tooth flank that he designs must can bear higher load. " to understand susceptive of place of gear tooth flank the size of force, the amount of the tine that contacts each other in the process that must know to having dynamical drive clearly. Only in transmission process very little tooth flank face can be contacted each other, this namely so called surface contacts an area. What the graph basically uses in the car transmission of 2 modernization is the power that gear of involute cylinder helical gear uses this very small interface to deliver whole engine namely. Be the same as what the gear of norms or smaller norms puts forward to ask higher to satisfy equipment to be opposite, engineers ever tried to use carrying capacity in new transmission design the data with stronger, higher price will make gear. Consider the factor of car cost however, this kind of attempt often does not have good outcome. Value proposal of treatment precision Mr Scholz: "Can increase the carrying capacity of gear through improving tooth flank design and workmanship. " in a lot of element that enhancing gear carrying capacity, have conclusive meaning arrived since 2 o'clock. The first error that is the academic figure that reduces appearance of tooth flank geometry and design; The 2nd be avoid tooth flank " edges and corners is contacted " . Can come true this at 2 o'clock through reducing the production noncombatant duty of gear, and this also produced workmanship to bring profound influence to gear. Gear production manufacturer is being machined tall bear the weight of the craft plan that the finish machining after quenching adopts commonly when gear, but here the properest production technology is gear grinding. Explanation of T ü Mr Rich says: "In the finish machining of horniness data gear, the engineer can pass the geometrical form that designs tooth flank correctly to compensate the material that causes by load accurately to be out of shape. " the first step that horniness data gear devises is the tooth flank appearance after getting power certainly and academic involute in press stress (hertz contacts stress) the difference after action. Form of tooth flank beat grinds figuration through essence of emery wheel knife, this design phase in transmission is already affirmatory. If tooth flank suffers force to be out of shape,can pass tooth flank long form makes tooth flank generatrix gets power serious area is raised, affirmatory contact adjusts position, achieve this one goal through proper athletic control. Remove the restricts gear tooth flank jackknife getting power of geometrical appearance, namely from tooth flank left to on the right side of geometrical appearance overlaps " twist is out of shape " , did not get all the time of the engineer enough take seriously. The occurrence of this kind of jackknife is helix angle and form of beat of tooth flank generatrix the result of joint action. When undertaking machining to columnar helical gear, the treatment contrail of emery wheel can undertake along direction of tooth flank generatrix only. T ü Mr Rich sums up: "Overlap to avoid this kind of tooth flank to get power or be opposite purposefully tooth flank jackknife brings to bear on influence, the part of clench the teeth that can carry axial of the edge in changing theory of grinding cutting tool to change will come true. " but this brought a new issue, search the knife of emery wheel nap that can finish job of nap of this emery wheel namely. Because extremely tall to transmission gear precision asks, be in so groovy cutting tool is used inside shorter time relatively or becoming knife of nap of molding sand annulus is to cannot finish this job. The attempt on the market uses the basic form with nap proper knife and complex much axis motion to control the solution that will realize this task, in because very strict tolerancepublic errand requirement is in short of gear,applying, got a lot of limitation. Graph 4 in Anti-Twist technology, the Anti-Twist technology that the radial feed of the axial motion of knife of emery wheel nap and regulation formed compound motion to succeed and apply patent protection by Gleason company research and development (see a picture 4) solved afore-mentioned tooth flank jackknife problem. Its are used inexact cylindrical screw is in the action of horn of tooth flank clench the teeth, knife of emery wheel nap common feed moves with decide definitely justice hollow appearance overlay is together. Come so, can avoid tooth flank jackknife not only, realize an edge likely still direction or the feed that lose way. Anti-Twist technology won't be restricted somewhat to the productivity of equipment, and still can be convenient on machine of roll flute of series of original equipment TWG filling outfit. This also provided larger free space for the design of transmission of new generation gear. CNC Milling