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Method for improving nitriding bevel gear wheel part machining precision

A technology for machining bevel gears and parts, applied in the field of machining parts, can solve problems such as reducing gear accuracy, and achieve the effects of eliminating cutting stress, improving machining accuracy, and improving hardness

Active Publication Date: 2015-06-24
XIAN NORTH ELECTRO OPTIC TECH DEFENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the nitriding layer is too thin, the gears are generally no longer processed after nitriding. For high-precision gear parts, the deformation will reduce the accuracy of the gears. It is necessary to control the processing deformation of the parts and the influence of nitriding on the accuracy of the gears.

Method used

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  • Method for improving nitriding bevel gear wheel part machining precision
  • Method for improving nitriding bevel gear wheel part machining precision
  • Method for improving nitriding bevel gear wheel part machining precision

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The method for improving the machining accuracy of nitriding bevel gear parts of the present invention, it comprises the steps:

[0032] (1) Rough turning blanks, rough machining of bevel gear parts;

[0033] (2) Heat treatment and tempering, the required hardness of the parts is HRC: 28-32, the quenching heating temperature is 840-860°C, heat preservation for 1.5-2h, and then oil quenching, the quenching oil temperature is 40-60°C, and then tempering , the tempering temperature is 640-680°C, keep warm for 2-2.5 hours, and air-cool to room temperature;

[0034] Practice has proved that the nitriding effect of adding heat treatment quenching and tempering process is more obvious than that of the sample without adding quenching and tempering process. Under the same process conditions, the depth of the nitriding layer can be increased by more than 20% after quenching and tempering, and the hardness is also improved.

[0035] (3) Semi-finishing gear blanks, semi-finishing...

Embodiment 2

[0052] In the step 2 heat treatment quenching and tempering, the parts need to be put into an iron box during tempering, and the iron box is covered with charcoal particles to protect the parts to prevent decarburization of the parts.

[0053] In the stress relief annealing of step 5, after the furnace is cooled to 250°C, put the parts into an iron box, then air cool to room temperature, clean the coating before packing, cover the iron box with charcoal particles to protect the parts, and strictly prevent the parts from decarburization and oxidation.

[0054] In the tooth surface nitriding treatment in step 14, the LD-100 3mm deep-well ion nitriding furnace is used, with a rated output DC current of 100A and a voltage of (750-850)V. After the equipment is pre-evacuated to (6.66±0.2)Pa, the (0.25~0.3)L / min ammonia gas, ensure the nitriding under vacuum (665~745)Pa. The working temperature is (500~560)℃, and the deformation can be controlled within 0.003mm~0.008mm; at the same ...

Embodiment 3

[0057] In this embodiment, the machining of 7-grade precision nitriding straight bevel gear is taken as an example. The material is 38CrMoALA, and the precision grade after nitriding is 7e GB / T10225-1988. The parameters of the cut straight bevel gear are shown in Table 1.

[0058] Part structure such as figure 1 and figure 2 As shown, the diameter of the reference hole 3 is The diameter of addendum circle 1 is Addendum cone angle 5 is 71°20'11"±5', back cone angle 2 is 19°30'±5', and the runout of addendum circle 1, addendum cone 5, and back cone angle 2 relative to reference hole 3 is required The error is 0.01mm, the gear thickness is The verticality of both ends relative to the reference hole 3 is 0.01mm, and the bevel gear intersection size 4 is The diameter of the inner hole 7 is The depth is 6mm, the spherical surface 8 is SR219mm, the dimension 6 from the center of the spherical surface to the end surface is 216±0.05mm, and six square frames 10 are distribute...

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Abstract

The invention relates to the machining field of spare parts, in particular to a method for improving nitriding bevel gear wheel part machining precision. The method is characterized by comprising the following steps that 1, rough turning is conducted on a workblank; 2, heat treatment hardening and tempering are conducted; 3, semi-finish turning is conducted on gear blanks; 4, auxiliary procedures are conducted; 5, stress relieving is conducted; 6, gear blank fine machining is conducted; 7, a thickness side face of a gear is subjected to plane grinding; 8, a spherical surface is turned; 9, fine grinding is conducted on an addendum circle; 10, a top circular cone is turned; 11, a back circular cone is turned; 12, fine machining is conducted on the gear; 13, examination is conducted; 14, gear surface nitrogen treatment is conducted; 15, examination is conducted. The method for improving the nitriding bevel gear wheel part machining precision can improve the nitriding effect under the premise that the bevel gear wheel precision is guaranteed.

Description

technical field [0001] The invention relates to the field of parts processing, in particular to a method for improving the machining accuracy of nitriding conical gear parts. Background technique [0002] Nitriding of gears is a chemical heat treatment process that makes active nitrogen atoms infiltrate the surface of gears at a certain temperature. The main purpose of gear nitriding is to improve the hardness, wear resistance, anti-gluing performance, fatigue strength and corrosion resistance of the gear surface. Nitriding gears are used in gear manufacturing because they are carried out at lower temperatures and have less deformation. However, because the nitriding layer is too thin, the gears are generally no longer processed after nitriding. For high-precision gear parts, the deformation will reduce the accuracy of the gears. It is necessary to control the processing deformation of the parts and the influence of nitriding on the accuracy of the gears. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
CPCB23P15/14
Inventor 程会民张勇李时威安君伟杨永娟
Owner XIAN NORTH ELECTRO OPTIC TECH DEFENSE
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