Machinery reduces a few kinds of big methods of gear noise in hardware treatment

Decelerate machine cannot be passed leave factory exam, one of elements are loud noise of intermittence of decelerate plane existence. By repeats exam, analysis and improve an experiment, the conclusion that reach is to need to what produce each link undertake inducing conduction, ability is useful drop the noise of positive drive.
1, hold the precision that controls gear wheel: The main request of gear precision: Via exercitation test and verify, gear precision is indispensible hold accuse to be in GB10995 - 887~8 class, gear of 20m/s of linear velocity prep above, radial of circle of pitch extreme deviation, tine beats certain otherwise chaos arrives at public service, teeth directional public service 7 class precision. Below the situation that reachs gear wheel of 7 class precision, tine ministry should pour shuttle, should beware stage of tine root protruding.
2, hold the mass that charges raw material: High quality raw material is to produce the conditional premise of high quality commodity, the data 40Cr with my company the biggest dosage makes gear with 45 steel. Pass no matter why to plant method, the chemical composition with strict by wants to repair after raw material reachs a plant, brilliant granuality determines, spend assess chastely. Its purpose is to adjust heat treatment in time to be out of shape, ascensive tooth form machines medium quality.
3, avoid heat treatment to be out of shape: Tine base is in forging of essence of rough machining epigenesis, undertake normalizing or move qualitative processing, in order to arrive:
(1) bate steel so that undertake cutting is machined;
(2) eliminate remaining stress;
(3) refine grain, improve arrangement the mechanical function with ascensive steel;
(4) for culminating the preparation that can handle good arrangement to go up. What should take care is, in qualitative processing of normalizing or attune, must hold to temperature of the chamber of a stove or furnace even, and choose work appliance, make workpiece heats equably reach refrigeration, forbidden pile up together. Need bore to reduce the gear of weight, should have bore order put in order after heat treatment. The culminating heat treatment of gear is chosen make the spare parts is out of shape lesser tooth flank is high frequency quench; High frequency the tooth flank that after quenching, gets has high intensity, hardness, wearability and tired limit, and the plasticity that core still holds to to satisfy and endurance. Be out of shape to cut down. Tooth flank is high frequency quench should choose quench temperature is mixed inferiorly shorter heat hour, even heat, slow refrigeration.
4, ensure the precision of tine base: The central difference that the precision of the dimension of gear aperture requests to be worth in the deviation of aperture orders about dispersed, be in surely ± 0.003~ ± 0.005mm; Hypothesis out of tolerance and inside the program request limits in aperture, indispensible classification, turn into angrily working procedure respectively. The end panel of tine base is jumpy reach radial to beat for 6 class, it is surely inside 0.01~0.02mm limits.
5, angrily machines measure: The gear cutting tool that buys external is indispensible undertake repairing, indispensible arrive at AA class request. After blade of gear cutting tool is ground, need of red-letter day of week of the photograph adjacent difference of circular pitch of the radial to face of the blade before cutting tool sex, chamfer that hold bit, chamfer that hold bit the biggest accumulate accident, tooth in front with inside aperture axes parallelism undertakes repairing. Below the condition that does not affect gear intensity, coefficient of ascensive height of teeth top, add 0.05~0.1m, , improve coefficient of cutting tool height of teeth top, avoid positive drive to age the root works with. The gear of M=1~2 chooses tine to carry the hob that repair a circle on the head, xiu Yuan measures R=0.1~0.15m. Eliminate tine to carry burr on the head, the tine when improving positive drive is very dry with. Fan noise it is the noise source with the mainest tower of refrigeration of mechanical leak type, this noise is noise of air motive force, include onflow noise and rotate noise. The theoretical analysis that uses force noise source according to air is knowable, the sound intensity of onflow noise and air current are opposite of speed just become direct ratio 6 times, also wait with blade appearance about, have successional spectrum character. Rotate when blade rotates, noise forms pulsatile happening, discharge of it and blade number, gas, static pressure wait about, its spectrum shows character of low intermediate frequency. Angrily equipment should undertake precision is examined every year, what short of requests is indispensible undertake repairing. Wire-puller often also should have self check, hold in space of radial of machine tool main shaft especially accuse to be under 0.01mm, cutter shaft diameter jumps 0.005mm is the following, cutter shaft change moves 0.008mm the following. The device precision of cutting tool: Cutting tool radial is jumpy hold accuse to be under 0.003mm, end panel is jumpy 0.004mm is the following. Angrily tool precision, the space of arbor external diameter and workpiece aperture, ensure in 0.001~0.004mm less than. The whorl on arbor is indispensible kind of fixed position supports to fall in third, undertake grinding by whorl bed: Spend ≦ 0.003mm straight, diameter jumps ≦ 0.005mm. Nut is indispensible ensure inside outfit clip car becomes whorl and datum plane, the parallelism ≦ 0.003mm of washerbed down the livestock.
6, civilization produces: Positive drive noise has the element of 30% above to come from burr, knock against to hurt. Some factories are assembled in gear case before, take out burr and knock against are hurt, it is a kind of passive practice. (1) gear axis kind spare parts, ministry of the tine after gear hobbing is covered immediately on next line working procedure turn after plastic protection covers appropriative, taking appropriative plastic protection is covered put in storage and deliver goods. (2) have technical ability of top gem tine, drop tooth flank thick clumsy is spent, take out burr, prevent knock against injury, drop can usefully positive drive noise.
7, adopt other data and heat treatment, appearance to handle way: (1) can use pulverous metallurgy to shape skill, ministry of the tine after gear shapes is high frequency quench. (2) choose Mo Zhu iron, after gear cutting is machined, undertake soft nitrogen changes processing again. (3) choose 40Cr data, after gear cutting result is versed in, choose soft nitrogen to change processing or processing of tine ministry copper facing. Baconian place is narrated, want to cure positive drive noise thoroughly, gear data and heat treatment are to want this, tine base precision is to ensure, gear precision is ligament, civilization produces is bedrock.

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