The horn before the knife that insert tine reachs the influence of teeth shape error to cutting tool durability

In cutting treatment, the active life of cutting tool gets advocate limitation of cutting blade tatty. Element of tatty of influence cutting tool is more, condition of the structure of the mechanical physics property that includes workpiece material and cutting tool material, cutting tool and geometrical appearance parameter, cutting and dosage. To inserting tine treatment, of the knife that insert tine before horn has immediate effect to the durability of cutting tool and teeth shape error. The geometrical angle standard of the 1 knife that insert tine inserts ° of G=5 of the horn before the top blade of tine knife. Face of the knife before the knife that insert tine is inside sunken taper seat, because this formed the part before side edge. The horn before the side edge of the knife that insert tine should be in the umbriferous photograph that goes up in tool reference plane with cutting blade is perpendicular sectional (pursue namely 1 shows as tangent as basic circle column N-N sectional) on measure. A nods arbitrarily on side edge before formula of horny Gyc computation is Tangyc=tangsinay type in: Ay -- the involute pressure angle that A part orders arbitrarily on cutting blade, cosay=rb0/ry from this knowable, be in at each o'clock on side edge before horny cost Gyc differs, the part before be close to a circle to be in side edge is larger, the role before be close to a circle to be in side edge is minor. Because insert face of the knife before tine knife to be taper seat, reason side edge formed certain blade dip angle. The blade dip that nods each on cutting blade is different, the blade dip Ly that in aleatoric dot A is in is Tanly=tangcosay to blade of two side cutting, the part before carrying a circle on the head to be in side edge is the largest and blade inclination is the least, be in in root circle before side edge part is the smallest and blade dip is the biggest. Blade dip can rise to increase the action of the horn before the job. Insert tine knife to the standard (like M=2.

5mm, a=20 ° , z0=30, the) of the knife that insert tine of G=5 ° , ° of Gac=2 of the horn before the side edge of very round place 36, ° of Gfc=0 of the horn before the side edge that root circle is in 13. As a result of the horn before side edge all very small, have certain effect to cutting function. When the 2 horn before increasing the sword that insert tine are machining steeliness gear to the influence of cutting tool durability, the horn before increasing the sword that insert tine appropriately is helpful for improving treatment not only tooth flank is bright and clean degree, return the durability that can raise the sword that insert tine. If will insert the horn before tine knife to increase 15 ° by 5 ° , in M=2.

5mm, a=20 ° , z0=30, z1=42, below the treatment condition of Ae=9 ° , cutting tool durability but by 134.

8 minutes rise (raise 88%) , insert tine knife for the standard (Ae=6 ° , g=5 ° ) durability (62.

3 minutes) 4 times (rise 404.

7%) . Will before after horn increases 15 ° , can make the horn before side edge increases significantly (Gac=10 of the horn before side edge of very round place ° 39, 06) of ° of Gfe=7 of the horn before root circle is in side edge, improve treatment significantly thereby tooth flank is bright and clean degree. After the horn before the 3 horn before increasing the sword that insert tine increase the sword that insert tine to the influence of teeth shape error, the teeth shape error that increases the sword that insert tine, because this answers,increase the feasibility of the horn before the knife that insert tine according to be being asked to analyse by the precision of treatment gear. Be like to M=2.

5mm, a=20 ° , the knife inserting tine of Z0=30, when ° of Ae=6 of the horn after tine supports, the teeth shape error when using the part before differring sees a table (the) of teeth shape error after the numerical value in the watch is classics of part of body of the tooth that insert tine to amend. Knowable, when the horn before the knife that insert tine increases 15 ° , teeth shape error is quite big already, not allow to ignore. Insert tine knife to what big modulus, little tine counts, the teeth shape error of generation will be bigger. Accordingly, big before horn inserts tine knife to basically be applied to machine low precision gear or undertake rough machining. Circle of top of G of the horn before the horn before the watch inserts tine knife inserts tine knife to the influence of teeth shape error is in circle of root of Faµm of teeth shape error to be in ° of Ffµm5 of teeth shape error + 2.

8+5.

910 ° + 5.

0+10.

715 ° + 7.

7+15.

420 ° + 10.

0+20.

M=2 of parameter of the 1 knife that insert tine.

5mm, a=20 ° , z0=30 ° , ae=6 ° is in gear cutting, can encounter workpiece material plasticity sometimes bigger, before using a level, hind treatment of the knife that insert tine achieves requirement tooth flank not easily bright and clean spent circumstance, can use the method of the horn before increasing the sword that insert tine right now. When be like treatment 38CrNiMo ALA and 40CrNiMo A gear, before using a level, hind the tooth flank when the knife of horn that insert tine is machined produces deeper nick, via grinding tine, top gem ages the nick after waiting for working procedure is eliminated not easily also. Use right now before increasing, hind horn (Ae=9 ° , g=15 ° ) the knife that insert tine undertakes machining, tooth flank is bright and clean degree can stabilize achieve 5 ～ 6 class. When gear precision when the demand is higher, before inserting tine knife to because increase,avoid, hind horn causes out of tolerance of teeth shape error, can adopt solve measure below: ① amends the tooth form part of the knife that insert tine afresh. Express 1 in the teeth shape error that the teeth shape error that the Dao Genyuan that insert tine is in is more than very round place, if reduce the tooth form role of the knife that insert tine appropriately, can make root circle is in teeth shape error to reduce, reduce total teeth shape error thereby. Use this method to need to undertake repetition trying calculating, in order to make teeth shape error is achieved the smallest. If ② uses the method of horn of correction tooth form still when the tooth form precision that short of asks, can come out the computation of factual teeth shape error of the knife that insert tine, the emery wheel that inserts tine tooth form to grinding next undertakes special nap, the error of form of the tooth that insert tine that makes grinding goes out is the smallest. This method is opposite commonly the ability when tooth form precision has special demand is used. The special blade of face of the knife before the 4 knives that insert tine grinds the horn before the side edge that inserts tine knife to increase, still can use face of the knife before special blade grinds what methodological grinding inserts tine knife. To the knife inserting tine of common modulus, the blade that can use graph 2a place to show grinds a method, the horn before making insert the before carrying blade on the head horn of tine knife and side edge increases at the same time. The emery wheel that grinding uses is comprised by the taper seat of two side and the columnar face among, columnar range breadth is equal to the tine of the knife that insert tine to carry ply on the head, two side taper seat hands in a line to be hyperbola with what plug range of the knife before tine knife, this hyperbola and the involute theory tooth form of the knife that insert tine are very adjacent, the error of form of the tooth that insert tine that because this is ground,gives is dinky. The bigger to modulus knife that insert tine, the blade that can use graph 2b place to show grinds a method, part the horn before grinding gives the before carrying blade on the head horn of the knife that insert tine and side edge. Because special blade grinds a method the operation is complex, because this is in only,individual and special situation is used. (A)(b) pursues the special blade of face of the knife before the 2 knives that insert tine grinds the place on put together to narrate, in rough machining working procedure or not tall to machining precision to ask when, the horn before increasing the sword that insert tine appropriately can raise cutting tool durability and treatment tooth flank not only bright and clean degree, and the cutting force that still can reduce a machine tool on certain level, because of this can yet be regarded as the gear cutting method with a kind of practical economy. CNC Milling