The production of miniature pinion

5mm, external diameter is the miniature electric machinery of a few millimeter. But as a result of speed of electric machinery of this kind of miniature tall, torque is small, want to develop its property adequately, need to be in electric machinery and load (executive component) between join transmission comparing to be the miniature reducer of hundreds of. And in all sorts of main transfer machinery, positive drive is most commonly used. Accordingly, want to make reducer miniature is changed, the miniature that is necessary to realize gear is changed. The production method that miniature gear faces below, small large bamboo hat the small-sized gear of former company limited and the concerned machining technique that its process cutting tool give the introduction. The production method hob of miniature gear boils cut treatment to use hob to be cut on gear-hobbing machine normally make gear. Miniature gear (M0.

1 the following) when gear hobbing is machined, the tooth form of hob must have small treatment. Because tooth form is tiny, outside eliminating hob teeth shape error, the aperture of hob the error such as jumpy, Zhou Jie will be opposite jumpy, end panel the precision of miniature gear has very big effect. And the installation precision of the precision of all many sided such as index mechanism of main shaft of the gear-hobbing machine that treatment uses, workpiece, cutter spindle, workpiece and workpiece clamping apparatus, stiffness and hob and workpiece is waited a moment, meet those who affect miniature gear to make precision, accordingly, be necessary to improve production system total integrated precision. On this foundation, choose the material of easy cutting again, can realize batch easily to produce modulus the miniature gear with identical, different breed. Inject shapes plastic gear uses inject to shape the plastic gear that the law machines, because big batch can come true to produce inside short time, because this is multi-purpose,issue used gear at the lighter load such as office machine, electric home appliances01, pressure angle A: 20 ° , number of roller seating space: 12, external diameter OD: Ø25mm, inside aperture diameter: Ø10mm, hob width: 8mm, material is qualitative: Hard alloy. Hob precision: Make by precision of hob of company 3A class. All-purpose tool microscope of Cai department company (UMM200) measures gear; End panel is jumpy wait for the radio that uses a firm to measure small appearance ESM-01 to measure. The main parameter of trial-produce miniature gear: Modulus M: 0.

01, pressure angle A: 20 ° , flute profile: Involute, tine counts Z: 100, external diameter OD: Ø1.

02mm, material is qualitative: B.

S. Because contact gear measuring instrument cannot measure M0.

3 the following gear, reason detects on 200 times measuring projector with enlarge graph, the tooth form precision of this measurement technique can amount to 2 ～ 3µm. Hob of use high accuracy and transformed high accuracy gear-hobbing machine, can control the installation precision of hob and workpiece in 1µm less than. Undertake detecting to making the miniature gear that go out, the result makes clear, rolling cut treatment can use gear of miniature of production high accuracy. To study the economic value of miniature gear further, undertook the measurement of loss of miniature gear deputy clench the teeth. Test result makes clear, below proper lubricant way, its are in coequal level with the gear of average size as a result. Use trial-produce of gear of miniature end panel to carry tine reducer to be opposite the measurement of efficiency of miniature gear clench the teeth, confirmed it has practical the possibility that change, then uses gear of miniature end panel and pinion trial-produce reducer of mutation planet gear. As a result of the treatment of mechanical spare parts after miniature is changed precision becomes poor relatively, the orgnaization of the miniature reducer that needs to make develop consequently is not sensitive to precision. For this, the axial position of each spare partses decides reducer the state that adjusts according to place of gear clench the teeth. The reducer of trial-produce uses axial position to adjust came true not to have backlash drive. What trial-produce reducer uses the parameter of gear to be as follows: M: 0.

05, a: 20 ° , z1: 100, z2: 21, z3: 102, z4: 100(Z1, Z3, Z4 is end panel gear, z2 is pinion) , external diameter: Ø6.

6mm, full-length: 7.

4mm, decelerate comparing is 1 ∶ about 101, the relation that transfers torque, decelerate comparing and general power is as follows: Input torque: Ti ＝ 1 output torque: To ＝ (H1h2Z4/Z1+h2h3Z4/Z3)/(1-h2h3Z4/Z3) ,  speed ratio: µ ＝ (101  of Z4/Z1+Z4/Z3)/(1-Z4/Z3) ＝ overall efficiency: [(1-Z4/Z3)/(Z4/Z1+Z4/Z3)] × (H1h2Z4/Z1+h2h3Z4/Z3)/(1-h2h3Z4/Z3) ＝ 0.

The H1 in 425(type, h2, h3=0.

987) machines internal gear to use the treatment that insert tine normally with the trial-produce internal gear of broach, because cutting resistance is great,Dan Xiaozhi diameter inserts tine knife, cutting tool intensity is insufficient, reason is unwell the treatment of Yu Wei internal gear; If use line cut treatment or electric spark treatment, criterion because get line means or discharge clearance restrict, make miniature gear hard, unwell also produce at batch. More feasible method is to make an as identical as parameter of product internal gear broach, will pull with its make an internal gear. The precision of broach will answer mirror the internal gear at be being pulled to make, because this produces precision,better internal gear is feasible. The parameter of the internal gear broach of trial-produce is: M: 0.

14, a: 20 ° , z: 74, cutting blade counts: 70, full-length: 170mm. Its precision uses 200 times measuring projector to detect, teeth shape error is a few micron only, have practical precision. The reducer of trial-produce worm worm wheel of worm and worm wheel is used in the circumstance with not parallel take-off of high speed ratio, input, very effective. The methodological trial-produce that the company uses cutting to machine the worm of small modulus and with its conjugate, use as the helical gear of worm wheel. The parameter of trial-produce worm: M: 0.

03, a: 20 ° , head number: 1, external diameter: Ø0.

5mm. 10 thousand labour of Cai Si of each precision classics show the worm that trial-produce gives, helical gear (UMM200) detects, the error is counting micron less than, test and verify it is feasible that the method that uses cutting makes miniature worm, worm gear. The machine tool of the cutting tool that in be like treatment, uses, treatment, clamping apparatus requirement that satisfied high accuracy to machine a condition, so the miniature gear that processes all sorts of different types with cutting or grinding is feasible, this already got test and verify. It is to modulus 0.

01 the following gear undertake cutting or the possibility of grinding treatment still is in exploration phase, and on the base that making miniature gear, the production that implementation exceeds miniature gear, practical change, the main task that will be henceforth. The treatment precision that spends a part as a result of minimum is opposite poorer, it is consequently when orgnaization design, need to consider not sensitive to precision component to undertake adjustment. CNC Milling