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Reasonable way to reduce the noise of worm gear transmission
Effective Ways to Reduce the Noise of Worm Gear Transmission
1. Quality control of raw materials: High-quality raw materials are a prerequisite for the production and processing of high-quality goods. Small-modulus gears are used to produce 40Cr and 45 steel, which are in great demand, to produce gear shafts.Regardless of the method, the raw materials must undergo rigorous composition testing, accurate grain size measurement, and childlike evaluation after they arrive at the factory to ensure the quality of the raw materials. The purpose is to immediately adjust the heat treatment deformation and improve the quality in the production of synchronous gears.
2. Prevent heat treatment deformation: After rough machining, the tooth blank becomes a fine stainless steel casting, which is subjected to heat treatment or quenching and tempering treatment to exceed:
(1) Loose cast iron parts are conducive to milling production and manufacturing;
(2) Eliminate thermal stress;
(3) Improve crystallization and structure to improve the process performance of steel;
(4) Prepare adequately for the final solution.It should be noted that in the heat treatment or quenching and tempering treatment, it is necessary to maintain a uniform temperature in the furnace, and use welding fixtures to uniformly heat up and cool the iron castings. It is strictly forbidden to deposit together.For gear shafts that require revolving holes to reduce the net weight, the revolving sequence should be assigned after heat treatment.The final heat treatment of the gear shaft adopts induction hardening of the tooth surface, which causes less deformation of the parts; the tooth surface obtained after induction hardening has high tensile strength, compressive strength, wear resistance and strength limit, while the core still ensures sufficient Plastic deformation and plasticity.To reduce deformation.Tooth surface induction hardening should use lower quenching and tempering treatment temperature and shorter heating time, uniform heating, and slow cooling water.
3. To ensure the accuracy of the gear blank: The accuracy of the specifications and models of the gear shaft hole is required to spread from the right to the right of the hole error, set at ±0.003~±0.005mm; if the error is within the range of the hole design requirements, Try to classify them and transfer them to the gear cutting production process.The internal thread sloshing and radial sloshing of the tooth blank is level 6, which is set in the range of 0.01~0.02mm.
4. Requirements for CNC cutting tools and mechanical equipment for gear cutting production: Try to inspect the purchased gear cutting tools, and try to exceed the AA level requirements.After gear cutting tools are cut, try to check the radiality of the front edge of the CNC tool, the adjacent pitch difference of the chip flute, the large accumulated error of the chip flute, and the flatness of the front edge of the side edge and the thread axis.Without the necessary conditions to damage the tensile strength of the gear shaft, increase the addendum height index value by 0.05~0.1m, improve the addendum height index value of the CNC tool, and avoid the interference of the worm gear transmission gear. Gear shafts with M=1~2 adopt tooth tip rounding hobs, and the amount of rounding is R=0.1~0.15m.Eliminate tooth tip burrs and improve tooth tip interference during worm gear transmission.Gear cutting machinery and equipment have to undergo an accuracy inspection in previous years, and repairs that fail to meet the requirements should be performed as much as possible.The construction personnel must also conduct self-correction and self-examination frequently, especially when the radial clearance of the lathe spindle is controlled below 0.01mm, the tool shaft diameter jump is below 0.005mm, and the tool shaft shakes below 0.008mm.The installation accuracy of the CNC tool: the radial sway of the CNC tool is controlled below 0.003mm, and the internal thread sway is below 0.004mm.The accuracy of gear cutting work clothes, the gap between the diameter of the motor shaft and the hole of the cast iron, is guaranteed to be within 0.001~0.004mm.The inch thread on the motor shaft should be drilled by the inch thread machine under the precise positioning of the C-top type as far as possible: flatness≦0.003mm, diameter jump≦0.005mm.The screw cap should try to ensure that the external thread is clamped to the standard one time, and the flatness of the sealing ring is less than 0.003mm.
5. Control the accuracy of the gear shaft: the basic requirements for the accuracy of the gear shaft: verified by social practice activities, it is better to manufacture the gear shaft by mechanical processing, and the gear shaft accuracy should be controlled as far as possible to GB10995-887, and the angular velocity is higher than 8m/s gear. Shaft, tooth pitch limit deviation, absabs gear ring radial sway standard tolerance, tooth direction standard tolerance must be stable beyond the 20 level accuracy
1. Quality control of raw materials: High-quality raw materials are a prerequisite for the production and processing of high-quality goods. Small-modulus gears are used to produce 40Cr and 45 steel, which are in great demand, to produce gear shafts.Regardless of the method, the raw materials must undergo rigorous composition testing, accurate grain size measurement, and childlike evaluation after they arrive at the factory to ensure the quality of the raw materials. The purpose is to immediately adjust the heat treatment deformation and improve the quality in the production of synchronous gears.
2. Prevent heat treatment deformation: After rough machining, the tooth blank becomes a fine stainless steel casting, which is subjected to heat treatment or quenching and tempering treatment to exceed:
(1) Loose cast iron parts are conducive to milling production and manufacturing;
(2) Eliminate thermal stress;
(3) Improve crystallization and structure to improve the process performance of steel;
(4) Prepare adequately for the final solution.It should be noted that in the heat treatment or quenching and tempering treatment, it is necessary to maintain a uniform temperature in the furnace, and use welding fixtures to uniformly heat up and cool the iron castings. It is strictly forbidden to deposit together.For gear shafts that require revolving holes to reduce the net weight, the revolving sequence should be assigned after heat treatment.The final heat treatment of the gear shaft adopts induction hardening of the tooth surface, which causes less deformation of the parts; the tooth surface obtained after induction hardening has high tensile strength, compressive strength, wear resistance and strength limit, while the core still ensures sufficient Plastic deformation and plasticity.To reduce deformation.Tooth surface induction hardening should use lower quenching and tempering treatment temperature and shorter heating time, uniform heating, and slow cooling water.
3. To ensure the accuracy of the gear blank: The accuracy of the specifications and models of the gear shaft hole is required to spread from the right to the right of the hole error, set at ±0.003~±0.005mm; if the error is within the range of the hole design requirements, Try to classify them and transfer them to the gear cutting production process.The internal thread sloshing and radial sloshing of the tooth blank is level 6, which is set in the range of 0.01~0.02mm.
4. Requirements for CNC cutting tools and mechanical equipment for gear cutting production: Try to inspect the purchased gear cutting tools, and try to exceed the AA level requirements.After gear cutting tools are cut, try to check the radiality of the front edge of the CNC tool, the adjacent pitch difference of the chip flute, the large accumulated error of the chip flute, and the flatness of the front edge of the side edge and the thread axis.Without the necessary conditions to damage the tensile strength of the gear shaft, increase the addendum height index value by 0.05~0.1m, improve the addendum height index value of the CNC tool, and avoid the interference of the worm gear transmission gear. Gear shafts with M=1~2 adopt tooth tip rounding hobs, and the amount of rounding is R=0.1~0.15m.Eliminate tooth tip burrs and improve tooth tip interference during worm gear transmission.Gear cutting machinery and equipment have to undergo an accuracy inspection in previous years, and repairs that fail to meet the requirements should be performed as much as possible.The construction personnel must also conduct self-correction and self-examination frequently, especially when the radial clearance of the lathe spindle is controlled below 0.01mm, the tool shaft diameter jump is below 0.005mm, and the tool shaft shakes below 0.008mm.The installation accuracy of the CNC tool: the radial sway of the CNC tool is controlled below 0.003mm, and the internal thread sway is below 0.004mm.The accuracy of gear cutting work clothes, the gap between the diameter of the motor shaft and the hole of the cast iron, is guaranteed to be within 0.001~0.004mm.The inch thread on the motor shaft should be drilled by the inch thread machine under the precise positioning of the C-top type as far as possible: flatness≦0.003mm, diameter jump≦0.005mm.The screw cap should try to ensure that the external thread is clamped to the standard one time, and the flatness of the sealing ring is less than 0.003mm.
5. Control the accuracy of the gear shaft: the basic requirements for the accuracy of the gear shaft: verified by social practice activities, it is better to manufacture the gear shaft by mechanical processing, and the gear shaft accuracy should be controlled as far as possible to GB10995-887, and the angular velocity is higher than 8m/s gear. Shaft, tooth pitch limit deviation, absabs gear ring radial sway standard tolerance, tooth direction standard tolerance must be stable beyond the 20 level accuracy
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