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Time: 18th, Sept, 2013

Method for reducing Gear Transmission Noise



Noise Reduction Method

1.The control precision of the gear: basic requirements: the precision of gear is verified by practice, the accuracy of the gear must be controlled in GB10995 887~8 grade, line speed than 20m/s gear, gear, gear ring from the limit deviation of radial run out tolerance, helix tolerance must be level 7 stable accuracy reach. To gear precision grade 7 cases, teeth to prevent tooth chamfer, boss.

2.The control the quality of raw materials: high quality raw materials is a prerequisite for the production of high quality products, no matter which way, raw material to the plant will go through strict inspection, chemical composition, grain size determination of purity assessment. Its purpose is to adjust the heat treatment deformation, improve the quality of tooth shape processing in.

3.To prevent the heat treatment deformation: the gear blank in rough machining into precision forging, normalizing or quenching and tempering treatment, in order to achieve:

(1).The softening of steel for machining;

(2).The elimination of residual stress;

(3).Refine the grain, improve the organization in order to improve the mechanical properties of steel;

The final can make organizational preparations. It should be noted that, in normalizing or quenching and tempering treatment, must keep the furnace temperature uniformity, and using instrument, the uniform heating and cooling, is strictly prohibited stacking together. The need for drilling weight reduction gear, should be bored sequence arrangement after heat treatment.

Gear final heat treatment using high-frequency hardening tooth surfaces make parts deformation small; tooth surface has high frequency quenched with high strength, hardness, wear resistance and fatigue limit, but the heart is still keep the plasticity and toughness enough. In order to reduce the deformation. Tooth surface high-frequency quenching should use the lower quenching temperature and heating time is short, uniform heating, slow cooling.

4.To ensure the precision of gear blanks: intermediate gear hole size accuracy requirements in the hole deviation difference about distribution, in 0.003~ 0.005mm; if the difference and classification must be in the hole of the design range, respectively, into the cutting process. Face of gear blank beating and radial runout is 6, set in the range of 0.01~0.02mm.

5.Measures: cutting gear cutter for purchased must be inspected, must reach AA level requirements. Gear cutting tool grinding must be on the tool face, radial groove adjacent pitch difference, groove pitch error, maximum cumulative cutter front and inner hole axis parallelism test.

In the premise of not affecting the gear strength, improve the addendum coefficient, increase 0.05~0.1m, improve the tool, addendum coefficient, avoid the gear tooth interference. M=1~2 gear with addendum modification of circular hobbing cutter, rounding quantity R=0.1~0.15m. Eliminate the tooth top burr, improve gear tooth interference. Cutting equipment every year to an accuracy check, not up to the requirements of the repair must be carried out.

The operator must also often self, especially in the machine tool spindle radial clearance is controlled below 0.01mm, the cutter shaft diameter jump below 0.005mm, the cutter shaft moving below 0.008mm. The installation precision tool: cutter runout is controlled below 0.003mm, the end face runout below 0.004mm. Cutting tooling precision, mandrel diameter and gap workpiece hole, guarantee within 0.001~0.004mm. Screw mandrel must be top class location in propylene, thread grinding by bed: verticality 0.003mm 0.005mm, jump. The nut must ensure that the internal thread and the datum once clamping washers car, parallel degree 0.003mm.

6.Civilized production: gear transmission noise causes more than 30% from the burr, knocking. Some factories in gear box assembly, remove burr and knock against injury, is a kind of passive approach.

(1).The gear shaft, gear hobbing gear immediately after a plastic protective sleeve dedicated into the next process, and with special protection to the plastic sleeve storage and shipping.

.Are honing, reduce tooth face roughness, burr, and to prevent damage, can effectively reduce gear noise.

7.Take other materials and heat treatment, surface treatment:

(1)Whether can use molding technology of powder metallurgy, gear teeth forming after high frequency quenching.

(2).Using graphite cast iron, gear cutting, then the soft nitriding.

(3).Using 40Cr material, gear cutting work, using soft nitriding or tooth copper processing.

Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China. We can supply a full-range of power transmission products, such as chains, sprockets and plate wheels, pulleys, gearboxes, motors, couplings, gears and racks. Our product range also covers locking assemblies (clamping elements/locking device), taper bushes, QD bushes, bolt-on hubs, torque limiters, shaft collars,Drive Line ,Timing belts,Splined End Yoke, motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes.



Article tags: Gear ,Gear Transmission,gears and racks,Power Transmission.




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