Tooth form machines extend a law

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  • source:LAURENDA CNC Machining
Extending a law is to use gear cutting tool and make clench the teeth move and be cut by angrily base dentiform method. The most commonly used method is the treatment that insert tine and gear hobbing treatment. 1. The treatment that insert tine inserts tine treatment to be on the machine that insert tine undertake, be to be equivalent to the knife inserting tine of a gear and tine base by a pair gear makes clench the teeth move and cutting tooth form. Can decompose the process that insert tine for: Preexistence of the knife that insert tine cuts material of below one flake on tine base, insert tine knife go back next and had turned one small angle, tine base also has turned at the same time corresponding angle. Later, the knife that insert tine falls again insert on tine base to cut material of below one flake. Repeat afore-mentioned processes ceaselessly. Namely such, whole and alveolar be cut by ground of one knife knife, tooth form is become by gradually bag sth resembling a net. Accordingly, one inserts tine knife, the tooth form that can machine identical modulus and ages number differs, nonexistent academic error. If pursue,1 is shown. Graph A) of principle of the 1 treatment that insert tine inserts tine motion B) to insert C) of principle of figuration of tine tooth form to insert tine machine sketch map 1- inserts tine knife 2- to be inserted to age by treatment gear the following cutting moves: (1) advocate the fluctuation reciprocate that motion inserts tine knife. (2) exhibit movement (call minute of tine motion again) the motion that ensures the clench the teeth of the knife that insert tine and tine base concerns. (3) the roll that circumferential feed motion inserts tine knife, its are being controlled insert the cutting quantity that inserts below tine knife every time. (4) radial feed inserts tine knife to need radial to cut motion gradually, so that cut a complete tooth deep. (5) motion letting a knife inserts tine knife to return up when, the motion that ages to avoid to chafe with workpiece and make insert knife get out of the way is apart from certainly. Insert tine to divide comfortable age continuously at treatment outside columnar gear, suit to machine much couplet gear and internal gear particularly. Precision of the treatment that insert tine is 7 ～ commonly 8 class, ra value is tooth flank surface roughness 1.

6 μ M. Graph outline drawing of 2 gear-hobbing machine 1, lathe bed 2, block iron 3, pillar 4, journey switch 5, block iron 6, tool carrier 7, arbor 8, tie-in 9, workpiece arbor 10, workbench 2. Treatment of gear hobbing of gear hobbing treatment is to use gear hobbing knife to be in gear-hobbing machine (the method that gear machines on 2) seeing a picture. Principle of gear hobbing treatment is gear hobbing knife and tine base imitate make clench the teeth move to helix gear. Gear hobbing knife is just like a tine number is very few (come 2 tine) the gear with very long tine, worm of be similar in shape, via tooth of rack of a platoon is being formed after blade is ground. Accordingly, can regard gear hobbing as the rack knife treatment to tine base. Process of rolling cut gear is dissoluble for: After a tooth cuts material of below one layer, when a tooth is cut after, it is as a result of gyral hob gyroidal, make tooth position used a paragraph of small space to reach so, and gear base has turned at the same time corresponding angle. A tooth cuts material of below another layer after. Knife of rack of no less than moves ahead, gear base makes roll. such, tine base is cut by ground of one knife knife whole and alveolar, age the tooth form of side is become by bag sth resembling a net. Refer to a graph 3. So, this kind of method can use knife of a gear hobbing to machine identical modulus the gear that different tine counts. Nonexistent academic teeth shape error. Rolling cut ages columnar gear moves below from time to tome continuously: (1) advocate the whirligig of athletic hob. (2) exhibit movement (call minute of tine motion again) it is to make sure gear hobbing knife and the rotate speed of the gear that be cut must accord with a simulative the motion of clench the teeth of a pair of gear concerns. Namely hob turns, workpiece turns K/Z turns. Among them: K is the head number of hob, z is tine teeth of a cogwheel to count. (3) the widths over teeth that perpendicular feed motion wants to cut a gear, hob must make perpendicular feed motion along workpiece axial. Graph 3 gear-hobbing machine and treatment of treatment principle gear hobbing are comfortable at machining gear of cylinder of straight tine, inclined tine. Gear cutting precision is 8 ～ 7 class, ra value is tooth flank surface roughness 1.

6 μ M. Return with worm wheel hob, chain wheel hob on gear-hobbing machine can rolling cut worm wheel and chain wheel. Normal Align=left>3.

Tooth form machines a method to compare Normal Align=left> gear hobbing, insert tine and mill tine to compare mill tine to use common device and simple cutting tool to be able to process tooth form. But can machine 11 ～ only Ra value is surface roughness of 9 class precision, tooth flank 6.

～ of 3 μ M 3.

The tooth form of 2 μ M.

Gear hobbing and the graduation precision that insert tine and tooth form precision all relatively mill tooth depth, can machine surface roughness of 6 class precision, tooth flank to be worth Ra for 3.

～ of 2 μ M 1.

6 μ M; Gear hobbing and inserting tine is successive graduation and cutting, manufacturing efficiency compares mill tooth depth. Those who use same modulus boil to mix the knife that insert tine, all sorts of OK differring the gear that tine counts, reduced cutting tool number greatly, raised economic benefits. Normal Align=left> gear hobbing and inserting tine to compare gear hobbing is tooth makes successive whirl rate of cutting, cutting is higher, inserting tine is blade tine makes reciprocate, limitted cutting rate, productivity of reason gear hobbing is taller than plugging tine brand, gear-hobbing machine can machine gear of cylinder of straight tine, inclined tine and worm wheel, but cannot machine the much couplet gear with internal gear and too close apart; Tine knife is sowed to be cut continuously endlong along tine when inserting tine, amount of the line that include sth resembling a net is much also, and the teeth of a cogwheel when gear hobbing is endlong cut continuously for many times by hob, the tooth flank surface roughness that reason inserts tine is worth lesser; The production of the knife that insert tine, blade is ground examine mural hob is convenient, easy get high accuracy, but catenary of drive of tine of component of the aircraft that insert tine is more complex than gear hobbing, accordingly, the precision that machines gear is basic and same; The machine that insert tine can machine internal gear and much couplet gear, but cannot machine worm wheel. CNC Milling