The global market with intense competition asks gear makes manufacturer raise productivity to reduce manufacturing cost at the same time. This imply hob should achieve higher gear hobbing rate and feed rate. This need have the aid of at high grade material, high-powered coating. Because high grade cutting tool means high price normally, each respects that some aircraft processing factory is not analysing manufacturing process in order to decide truly main factor -- the totle drilling cost that produces expenditure of place of every spare parts -- reject to use high-powered hob below case. Develop hob of type of high-powered, much whorl, handle to realize the requirement of productivity of taller gear cutting to had brought about cutting tool architect. Handle type hob is made with makings of steel bar of integral cutting tool. The diameter is normally lesser, grow commonly at aperture type hob. Go up in gear-hobbing machine when installation when, secure in two end by journal, and type hob installs unlike aperture to go up in an arbor in that way. Cutting tool of integral handle type is commonly used at machining worm wheel, its ask cutter diameter is close to worm wheel diameter. Optimized handle type hob suits big batch high yield to measure applied situation most. Gear of big diameter, big modulus, such as is used at lorry gear-box or mine machinery to wait, use production of aperture type hob normally. The length form of handle type hob desire tremendous but rotate cutting area, every hob is OK cutting is many spare parts. The factor that reduces handle type and time of cutting of aperture type hob includes to increase the amount of the whorl on feed speed and hob speed and hob. When cutting tool architect tries to optimize function, they seek the cutting tool with lesser diameter, because small diameter is in,give exterior rate (foot / minute) it is OK to fall the cutting tool rotate speed with higher implementation. As a result of handle type cutter diameter is lesser, and without aperture, in the diameter similar case falls, what their length wants to compare aperture type hob is long. This formed larger rotate cutting area, it is in every cutting process, OK on hob cutting more workpiece. Hob enters cutting area along the gear hobbing of acuminate of its axes rotate. The project manager Glenn Schlarb of the company says Gelisen: "Handle type hob productivity is tall because there are more rotate places along hob in every cutting,be, as a result of hob material and wearability of cutting tool coating rise make cutting number increase, because this can machine more spare parts. Gear hobbing process can be being used or need not undertake below the circumstance of cooling fluid. But, a lot of users more deflection boils at undertaking working, because can avoid environmental protection problem,eliminate the disposal costs that concerns with cooling fluid. Do the hob that cuts a requirement to use its to have high grade coat, have taller temperature stability and inferior thermal conductivity, doing type in order to protect, high speed rolls the cutting blade below tine condition. Because handle type hob is whole form of characters or letters, the part that and be in uses is fewer, with Kong Shi hob component photograph is compared, their tigidity is taller. Hob installation is being used at grinding knife, installation and detected tip between, because this is OK,be detected. With Kong Shi hob photograph is compared, handle type hob eliminated Kong Hexin beat between the axis of tolerancepublic errand accumulate, and because spacer is mixed,install nut and cause brace up quiver error. Steel of hob of type of high grade handle and have taller wearability, no matter be in,be in when cutting room drench or taller hardness all is had below high temperature. Although fine steel and coating are more expensive than low function cost of material, but the cycle time that the taller cutting rate that with the diameter lesser handle type hob produces can assure every spare parts is faster however and lower finished cost (refer to form) . To applicable circumstance, this kind of sheet the benefit of finished cost respect should exceed sheet commonly the addition of cutting tool cost is measured. Saved sheet so totle drilling cost. Odd gear hobbing cost compares collect Genesis handle type and Kong Shi hob apply Gelisen quite: Car pinion, 36. 46mm external diameter, 22 tine, material 8620, hardness 180HB, production lot 800, 000. Hob material / coating: Handle type - tall carbon / vanadium / cobalt exceeds high-speed steel / AlNite Kong Shi - cobaltic bearing high-speed steel / AlNiteGenesis handle type (more fiducial) Kong Shi (as comparative as handle type) hob price 10058 sheet cutting tool cost (include to purchase and defend fee) .
1 hob speed 10062 feed speed 1001.
Time of 5 total production and cost 100214 cutting cycle time 100216 sheet manufacturing cost 100178 coating are crucial appropriate coating is used to be able to rise on hob productivity and reduce finished cost. According to different applied situation, use appropriate coating, cutting tool life may break up time, can save cutting tool cost so, reduce the number that change a knife, shorten machine tool machine down time. The technology of company of Oerlikon Balzers coating is in charge of Dr. Dennis Quinto to say, cutting blade nap has far-reaching effect to coating function, and be cutting tool function normally cannot pilot respect. The cutting power that acerb cutting blade produces is low, calorific amount is small, but raised coating to break off cracked danger however, can use below the circumstance with inferior feed only. Honing hind has the cutting blade of thicker coating, can prevent to break off well crack, but can produce higher cutting power however. Passing the cutting blade of horn and honing to be cracked to preventing to break off is the most reliable, fit stuff of brittleness cutting tool, such as hard alloy and Gao Jin give speed the situation. Because speed of the cutting in gear hobbing treatment is mixed,cut follow workpiece tensile strength greatly to increase and drop, because this is chosen appropriately,choose coating can realize higher rotate speed. Higher feed rate can achieve below certain circumstance. Almost all hob is to pass a kind to use deposit of physical gas phase (the coating of PVD) craft coating protects. Titanium nitrogen of the standard (below the circumstance that TiN) coating lubricates in low speed belt effective. Titanium carbon nitrogen (TiCN) coating raised hardness and wearability, applicable abrasiveness material. Titanium aluminous nitrogen (TiAlN) coating is to be used at doing type to machine, because they have high strenth and hear resistance. A kind of coating that machines development to do type recently is aluminous chromic nitrogen (AlCrN) , wearability, heat-resisting and be able to bear or endure oxidation performance is higher even. LMT-Fette Inc of new supply of goods of hob of ministry of Chinese and Western.
Already in Yilinuosi Liberty Ville city opened a hob to make kimono Wu plant. The first phase of this factory is production is ground make hobbing cutter, diametical pitch is 8 ～ 30. What still offer hob of 9 inches of diameters is heavy grind and outline machines a service again. Fette offers stuff of dimension of pitch of whole set, whole set, high grade pulverous metal, whole hard alloy and but cutting tool of graduation gear hobbing. The small pitch hob that includes to use material of high grade cutting to pledge, deep / rough machining of carry on one's shoulder of shallow dentiform heavy burden (pull tooth) hob -- take alternant tine to leave cutting tool life and feed rate in order to carry. The design uses these features at reducing edge forge to extend. Fette still is offerred expand chuck, can use handle type cutting tool can change arbor to pack a machine tool. Additional, the cutting cutting tool of Fette is OK come true on gear-hobbing machine below the condition that in sheet second outfit places horn and go burr treatment. Fette was rolled out newly recently reach without wring hob inside cold pattern hob. CNC Milling