Method for machining a steel wheel for a harmonic reducer

Abstract

The application discloses a machining method for a steel wheel of a harmonic reducer, and comprises the following steps: S1, blanking; S2, forging; S3, performing one-stage preheating and two-stage preheating; S4, quenching; S5, primary tempering; S6, rough turning; S7, machining a plurality of flange holes; S8, secondary tempering treatment; S9, fine turning; S10, machining gear teeth; and S11, performing surface hardening treatment, so as to obtain a finished steel wheel. The application reasonably improves the steps of steel heat treatment, turning machining, gear tooth machining and surface hardening treatment, improves the strength of the steel wheel itself, improves the machining precision of the gear teeth, ensures that the steel wheel has high precision and stability when the steel wheel is actually applied to the harmonic reducer, and prolongs the service life of the harmonic reducer.

Description

Technical Field

[0001] This invention relates to the field of harmonic reducer technology, and in particular to a method for processing a steel wheel for a harmonic reducer. Background Technology

[0002] Harmonic reducers are precision speed reduction devices widely used in various industrial fields. The steel wheel is one of the core components of a harmonic reducer, and its performance (e.g., precision, hardness, stability) directly affects the performance and service life of the reducer. In existing technologies, the performance of the steel wheel is often improved by using superior materials, which not only significantly increases costs but also does not yield significant performance improvements. In view of the above technical problems, this invention proposes a processing method for steel wheels used in harmonic reducers to improve their precision and stability. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a method for processing steel wheels for harmonic reducers, aiming to solve the technical problem that the performance of steel wheels for harmonic reducers needs to be further improved in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A method for machining a steel wheel for a harmonic reducer includes the following steps: S1, Select 40CrNiMo raw material steel bar and cut it to obtain billet; S2, the billet is forged to obtain a prototype; the prototype includes an annular body and a flange ring disposed on the outside of the annular body; S3, heat the prototype to 780~800℃ for a first-stage preheating, the first-stage preheating holding time is T1; then heat to 830~850℃ for a second-stage preheating, the second-stage preheating holding time is T2, and then cool to room temperature; S4, heat to 850~890℃, hold at that temperature for a period of time, and then quench after T3; S5, undergo a tempering process, heat to 150~600℃, hold at that temperature for a period of time (T4), and then cool to room temperature; S6. Rough turning is performed on the prototype part, including turning the inner circle, turning the outer circle, and turning the end face; to obtain a semi-finished steel wheel; S7, Machining several flange holes on the semi-finished steel wheel; S8, the semi-finished steel wheel is subjected to a second tempering treatment, heated to 150~600℃, held at that temperature for a period of time (T5), and then cooled to room temperature; S9, precision turning of the semi-finished steel wheel; S10, machining gear teeth from semi-finished steel wheels; S11, the steel wheel obtained in step S10 is subjected to surface hardening treatment to obtain the finished steel wheel.

[0005] Furthermore, in the processing method of the steel wheel for the harmonic reducer, the heat preservation time T1 of the first stage of preheating in step S3 is 20~30 minutes; the heat preservation time T2 of the second stage of preheating is 2~2.5 hours.

[0006] Furthermore, in the processing method of the steel wheel for the harmonic reducer, the heat preservation time T3 in step S4 is 1~2 hours, and the quenching method is oil quenching.

[0007] Furthermore, in the processing method for the steel wheel used in the harmonic reducer, the heat preservation time T4 in step S5 is 2-3 hours.

[0008] Furthermore, in the machining method for the steel wheel used in the harmonic reducer, in step S6, a machining allowance of 2-3 mm is retained after rough turning.

[0009] Furthermore, in the processing method of the steel wheel for the harmonic reducer, in step S8, the heat preservation time T5 is 2 hours.

[0010] Furthermore, in the processing method of the steel wheel for the harmonic reducer, the tooth width of the finished steel wheel is 0.1d to 0.2d, where d is the pitch circle diameter of the finished steel wheel.

[0011] Furthermore, in the processing method for the steel wheel used in the harmonic reducer, the surface hardening treatment in step S11 is carburizing treatment.

[0012] Beneficial Effects: This invention provides a method for processing steel wheels for harmonic reducers. Compared to existing technologies, in step S3, the first and second stages of preheating ensure more thorough preheating, which helps eliminate internal stress and reduce carbide precipitation. In step S4, heating to 850-890℃ and holding before quenching helps eliminate internal structural defects in the 40CrNiMo steel and improves its strength and toughness; subsequent quenching allows the 40CrNiMo steel to achieve high strength and hardness. In step S5, the first tempering process reduces the material's hardness and brittleness while improving its toughness and plasticity. In step S8, the second tempering further eliminates residual stress, making the steel wheel less prone to cracking. Furthermore, by further defining the tooth structure, the service life of the harmonic reducer is improved. Detailed Implementation

[0013] This invention provides a method for processing a steel wheel for a harmonic reducer. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0014] This invention provides a method for processing a steel wheel for a harmonic reducer. Since the steel wheel structure itself is prior art and this application does not aim to propose a new steel wheel structure, the structure of the steel wheel is not shown in the accompanying drawings.

[0015] A method for machining a steel wheel for a harmonic reducer includes the following steps: S1, Select 40CrNiMo raw material steel bar and cut it to obtain billet; S2, the billet is forged to obtain a prototype; the prototype includes an annular body and a flange ring disposed on the outside of the annular body; S3, heat the prototype to 780~800℃ for a first-stage preheating, the first-stage preheating holding time is T1; then heat to 830~850℃ for a second-stage preheating, the second-stage preheating holding time is T2, and then cool to room temperature; S4, heat to 850~890℃, hold at that temperature for a period of time, and then quench after T3; S5, undergo a tempering process, heat to 150~600℃, hold at that temperature for a period of time (T4), and then cool to room temperature; S6. Rough turning is performed on the prototype part, including turning the inner circle, turning the outer circle, and turning the end face; to obtain a semi-finished steel wheel; S7, Machining several flange holes on the semi-finished steel wheel; S8, the semi-finished steel wheel is subjected to a second tempering treatment, heated to 150~600℃, held at that temperature for a period of time (T5), and then cooled to room temperature; S9, precision turning of the semi-finished steel wheel; S10, machining gear teeth from semi-finished steel wheels; S11, the steel wheel obtained in step S10 is subjected to surface hardening treatment to obtain the finished steel wheel.

[0016] Preferably, the heat preservation time T1 for the first stage of preheating in step S3 is 20-30 minutes; the heat preservation time T2 for the second stage of preheating is 2-2.5 hours.

[0017] Preferably, the holding time T3 in step S4 is 1 to 2 hours, and the quenching method is oil quenching.

[0018] Preferably, the heat preservation time T4 in step S5 is 2 to 3 hours.

[0019] Preferably, in step S6, a turning allowance of 2-3 mm is retained after rough turning.

[0020] Preferably, in step S8, the heat preservation time T5 is 2 hours.

[0021] Preferably, the tooth width of the finished steel wheel is 0.1d to 0.2d, where d is the pitch circle diameter of the finished steel wheel.

[0022] Preferably, the surface hardening treatment in step S11 is carburizing.

[0023] As can be seen from the above analysis, compared with the prior art, the present invention makes reasonable improvements to the heat treatment, turning, gear machining and surface hardening treatment of 40CrNiMo steel, which improves the strength of the steel wheel itself and the machining accuracy of the gear teeth. This ensures that the steel wheel can guarantee the high precision and stability of the harmonic reducer in actual application, and also improves the service life of the harmonic reducer.

[0024] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A method for machining a steel wheel for a harmonic reducer, characterized in that, Includes the following steps: S1, Select 40CrNiMo raw material steel bar and cut it to obtain billet; S2, the billet is forged to obtain a prototype; the prototype includes an annular body and a flange ring disposed on the outside of the annular body; S3, heat the prototype to 780~800℃ for a first-stage preheating, and hold the preheating temperature for 20~30 minutes; then heat to 830~850℃ for a second-stage preheating, and hold the preheating temperature for 2~2.5 hours, and then cool to room temperature; S4, heat to 850~890℃, hold for 1~2 hours and then quench, the quenching method is oil quenching; S5, undergo a tempering process by heating to 150~600℃, holding for 2~3 hours, and then cooling to room temperature; S6. Rough turning is performed on the prototype part, including turning the inner circle, turning the outer circle, and turning the end face; a semi-finished steel wheel is obtained; after rough turning, a turning allowance of 2~3mm is retained; S7, Machining several flange holes on the semi-finished steel wheel; S8. The semi-finished steel wheel undergoes a secondary tempering treatment, heated to 150~600℃, held at that temperature for 2 hours, and then cooled to room temperature. S9, precision turning of the semi-finished steel wheel; S10, machining gear teeth from semi-finished steel wheels; S11, the steel wheel obtained in step S10 is subjected to surface hardening treatment to obtain the finished steel wheel; the surface hardening treatment is carburizing treatment.

2. The method for processing a steel wheel for a harmonic reducer according to claim 1, characterized in that, The tooth width of the finished steel wheel is 0.1d to 0.2d, where d is the pitch circle diameter of the finished steel wheel.