阅读说明：本技术 一种高强合金弹簧弹力稳定化热处理方法 (High-strength alloy spring elastic force stabilization heat treatment method ) 是由 孙建通 白俊炜 徐晶 王聪 司亮 王春雷 于 2019-11-22 设计创作，主要内容包括：本发明涉及一种高强度合金材料的弹簧的稳定化热处理方法,属于高强度合金加工技术领域。本发明对3J21弹性合金丝材的限位弹簧进行稳定化处理,首先将弹簧安放在固定的结构中,从室温T1以一定的升温速率υ均匀加热至温度T2,保持时间为t1,然后关闭电源,使弹簧在炉腔内自然至室温T1。本发明在固定装置中将弹簧在工作高度状态下的内部残余应力进行释放,在不改变材料状态的前提下提高弹力值的稳定性,从而满足机械密封结构用弹簧的使用要求。(The invention relates to a stabilization heat treatment method for a spring made of a high-strength alloy material, and belongs to the technical field of high-strength alloy processing. The invention carries out stabilization treatment on the limiting spring of the 3J21 elastic alloy wire material, firstly, the spring is placed in a fixed structure, the spring is uniformly heated to the temperature T2 from the room temperature T1 at a certain heating rate upsilon, the holding time is T1, and then, the power supply is turned off, so that the spring is naturally heated to the room temperature T1 in a furnace chamber. According to the invention, the internal residual stress of the spring in the working height state is released in the fixing device, and the stability of the elastic value is improved on the premise of not changing the material state, so that the use requirement of the spring for the mechanical sealing structure is met.)

1. An elastic force stabilization heat treatment method of a high-strength alloy limit spring is characterized by comprising the following steps:

(1) winding the elastic alloy wire into a spring meeting the requirements of fixed parameters and force values;

(2) mounting the spring in a fixture to maintain it at a working height;

(3) placing the fixing device provided with the spring into a heating furnace, and uniformly heating the fixing device from room temperature T1 to a temperature T2 +/-5 ℃ at a heating speed upsilon;

(4) adjusting the heating furnace to keep the fixing device at the temperature of T2 for T1;

(5) the furnace was turned off and the fixture was allowed to return to temperature T1 in its natural state.

2. The heat treatment method for stabilizing elasticity of a high strength alloy limit spring according to claim 1, wherein the elastic alloy material in the step (1) comprises C0.07 ~ 0.12.12 wt%, Mn1.70 ~ 2.30.30 wt%, Si 0.60 wt%, P0.010 wt%, S0.010 wt%, Co 39.0 ~ 41.0.0 wt%, Cr 19.0 ~ 21.0.0 wt%, Ni14.0 ~ 21.0.0 wt%, Mo 6.50 ~ 7.50.50 wt%, and Fe for the rest.

3. The elastic force stabilization heat treatment method of the high-strength alloy limit spring according to claim 1, wherein the height h of the spring in the fixing device in the step (2) is adjusted according to the use height.

4. The heat treatment method for stabilizing elasticity of a high strength alloy limit spring according to claim 1, wherein the fixing device in the step (2) is structured such that a guide bolt is disposed in the inner cavity of the housing, the adjusting press plate is sleeved on the guide bolt, a spring limit groove is disposed on the base of the housing, and the spring is installed between the limit groove and the adjusting press plate.

5. The elastic force stabilization heat treatment method of the high-strength alloy limit spring as claimed in claim 1, wherein in the step (3), the temperature increase v is 10 ± 2 ℃/min, and the temperature T2 is 145-155 ℃.

6. The elastic force stabilization heat treatment method of the high-strength alloy limit spring as claimed in claim 1, wherein the heat preservation time t1 in step (4) is 290-310 min.

Technical Field

The invention belongs to the technical field of high-strength alloy processing, relates to heat treatment of a Co-Gr-Ni alloy spring, and more particularly relates to a heat treatment method for stabilizing the elasticity value of a limiting spring of a Co-Gr-Ni alloy.

Background

The high-strength alloy material has the characteristics of high strength, plasticity, good mechanical property, failure hardening property and the like, has corrosion resistance and mechanical property under the high-temperature condition, and is a common material in the fields of aerospace, sealing elements, ship transportation and the like at present.

In the mechanical sealing structure of aerospace or weapon products, the high-temperature alloy material spring provides a fixed releasing acting force for the sealing assembly, so that a certain end face specific pressure exists on the mechanical sealing surface, and the mechanical sealing surface achieves a sealing effect. Because the products all have certain storage period, the spring is released to a certain extent due to compression deformation and processing residual stress in the storage period, and meanwhile, the spring material per se also generates stress relaxation, the spring elasticity value is attenuated under the combined action of the spring and the spring, and the mechanical seal leaks.

Disclosure of Invention

Based on the problems in the prior art, the invention provides a heat treatment method for stabilizing the elasticity of a high-strength alloy spring, which solves the problem of serious attenuation of the elasticity value in the process of weakening service on the premise of improving the processing qualified rate of parts.

The technical scheme of the invention is as follows:

an elastic force stabilization heat treatment method of a high-strength alloy limit spring comprises the following steps:

(1) winding the elastic alloy wire into a spring meeting the requirements of fixed parameters and force values;

(2) mounting the spring in a fixture to maintain it at a working height;

(3) placing the fixing device provided with the spring into a heating furnace, and uniformly heating the fixing device from room temperature T1 to a temperature T2 +/-5 ℃ at a heating speed upsilon;

(4) adjusting the heating furnace to keep the fixing device at the temperature of T2 for T1;

(5) the furnace was turned off and the fixture was allowed to return to temperature T1 in its natural state.

The elastic alloy material in the step (1) comprises, by mass, 0.07 ~ 0.12.12% of C, 0.70 1.70 ~ 2.30.30% of Mn, 0.60% or less of Si, 0.010% or less of P, 0.010% or less of S, 39.0 ~ 41.0.0% of Co, 19.0 ~ 21.0.0% of Cr, 14.0 ~ 21.0.0% of Ni, 6.50 ~ 7.50.50% of Mo, and the balance Fe, and belongs to cobalt-chromium-nickel alloy.

And (3) adjusting the height h of the spring in the fixing device in the step (2) according to the use height.

The fixing device in the step (2) is structurally characterized in that a guide bolt is arranged in an inner cavity of the shell, an adjusting pressure plate is sleeved on the guide bolt, a base of the shell is provided with a spring limiting groove, and a spring is arranged between the limiting groove and the adjusting pressure plate.

In the step (3), the temperature rising speed upsilon is 10 +/-2 ℃/min, and the temperature T2 is 145-155 ℃.

The temperature keeping time t1 in the step (4) is 290-310 min.

The invention achieves the following beneficial effects: the invention can perform stabilization treatment after height adjustment according to the actual working state of the spring, thereby greatly improving the heat treatment quality of the spring and prolonging the service life of the spring.

The process comprises the steps of limiting and fixing, uniformly heating, keeping constant temperature and cooling along with a furnace, and can greatly improve the heat treatment quality of the spring, thereby greatly reducing the stress attenuation phenomenon of the spring in the service process and prolonging the service life of the spring.

Drawings

FIG. 1 is a process diagram of the present invention.

Fig. 2 is a schematic structural view of the fixing device of the present invention.

Detailed Description