Flexible tool for preventing solution aging deformation of super-long high-precision spring
Through the combination of straightener rope and counterweight in flexible tooling, the deformation problem caused by self-weight or mandrel bending during solid solution aging of ultra-long and high-precision springs is solved, and the straightness and height of the spring are achieved in accordance with the design requirements.
Patent Information
- Application Number
- CN202422778412.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-11-14
AI Technical Summary
The prior art cannot effectively ensure that the ultra-long and high-precision springs meet the design requirements of straightness and height during the solid solution aging process, resulting in the scrapping of the spring.
Using flexible tooling, the rollers are used to keep the spring in a straightened state during heating by combining straightening ropes and counterweights to prevent deformation.
It effectively prevents the difference in linearity and height of the spring due to self-weight or mandrel bending during the solid solution aging process, ensuring that the straightness and height of the spring meet the design requirements.
Smart Images
Figure CN223304504U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of solid solution aging treatment of springs, in particular to deformation of ultra-long high-precision springs during solid solution aging, and specifically to flexible tooling for preventing deformation of ultra-long high-precision springs during solid solution aging. Background Art
[0002] A compression spring in a nuclear product hydraulic control rod, such as Figure 1 As shown, the material is nuclear-grade high-temperature alloy GH4169, requiring solution aging after winding. The typical processing flow for this type of spring is: winding - cutting - solution aging - grinding - shaping - normal pressure - permanent deformation - testing. The required straightness after treatment is 0.5mm. However, according to the Class 1 accuracy standard of GB / T1239.2-2009, the straightness of this spring should be 2.0mm, far exceeding the standard requirement, making it a high-precision spring. After solution aging, the spring surface must maintain its natural metallic color, and pickling and shot blasting are not permitted to prevent corrosion or damage to the steel wire surface.
[0003] The existing technologies are as follows:
[0004] 1. After the spring is wound and formed, two core shafts are made respectively. The spring is put on the core shaft and hung vertically and horizontally in the furnace for solution aging treatment (see Figure 2 , 3).
[0005] 2. For the solid solution aging treatment, a vacuum gas quenching furnace is used. The vacuum degree is kept at 8×10-2Pa during the heating and holding process. The cooling gas is nitrogen with a purity of not less than 99.9%. This treatment is conducive to maintaining the original color of the metal and reducing the deformation of the spring. The final solid solution aging process parameters are:
[0006] Equipment: vacuum gas quenching furnace;
[0007] Solution: 1000℃+1h, vacuum not less than 8×10-2Pa, 99.9% nitrogen cooling;
[0008] Aging: Heat to 700℃ and keep warm for 10 hours, cool to 600℃ with the furnace, keep warm for 10 hours, vacuum degree not less than 8×10-2Pa, cool to below 100℃ with 5000mba nitrogen and take out of the furnace.
[0009] The results after taking the above measures are as follows: the surface of the springs loaded horizontally into the furnace is bright white, which meets the technical requirements of the natural color of metal, but the straightness of the two springs are 1.58mm and 1.56mm respectively, which exceeds the design requirement of 0.5mm and are unqualified; the surface of the springs loaded vertically into the furnace is also bright white, which meets the technical requirements of the natural color of metal, and the straightness of the two springs are 0.40mm and 0.36mm respectively, which meet the design requirement of 0.50mm, but the free height of the spring is reduced to 180mm, which is far below the design requirement of 200mm and is scrapped.
[0010] The defects of the existing technology are as follows: the spring is a compression spring, and two ways of loading the furnace were adopted during the test: horizontal loading and vertical loading. Figure 3 During the heating and holding process, the spring's height decreased due to its own weight, resulting in out-of-tolerance springs and the scrapping of two tested springs. When loaded horizontally into the furnace, the spring's height was 200mm, its inner diameter was φ3.5mm, and the hanging mandrel was φ3.5×250mm. During the solution treatment at 1000°C, the mandrel bent, causing the spring's straightness to exceed the tolerance and being directly scrapped. Testing revealed that the mandrel's straightness was also 1.58mm and 1.56mm. Therefore, it can be seen that for these ultra-long, high-precision springs, the existing technology cannot guarantee that the spring's straightness meets the design requirements. Utility Model Content
[0011] The purpose of the utility model is to provide a flexible tooling to prevent deformation of super-long high-precision springs during solid solution aging, and to solve the technical problems in the prior art of super-long high-precision springs having height deviations when placed vertically in a furnace and super-long high-precision springs having straightness deviations when placed horizontally in a furnace.
[0012] The utility model is realized by adopting the following technical solutions:
[0013] A flexible tooling for preventing deformation of ultra-long high-precision springs due to solid solution aging includes a straightening rope, roller a and roller b. A counterweight a is provided at one end of the straightening rope and a counterweight b is provided at the other end. The straightening rope passes around roller a and roller b in sequence. The roller a is rotatably connected to the support rod a, and the roller b is rotatably connected to the support rod b. The roller a and roller b are at the same horizontal height, and the support rod a and support rod b are fixedly connected to a base.
[0014] During application, 1. Insert the straightening rope into the inner hole of the spring and add counterweights at both ends of the straightening rope; 2. Place the straightening rope, spring and counterweight on rollers a and b of the tooling; 3. The straightening rope is straightened under the action of the gravity of the counterweight, thereby driving the spring to a straight state; 4. The tooling with the spring inserted in this way is placed in the furnace for heating; 5. During the heating, insulation and cooling processes, due to the presence of the counterweight, the straightening rope is always in a straightened state, thereby preventing the spring from bending and ensuring the straightness requirements of the spring; 6. After taking the spring out of the furnace, remove the spring from the tooling to prevent the spring from bending due to external force during the unloading process, thereby affecting the straightness.
[0015] Further preferably, the connection portion between the support rod a and the support rod b and the base is between the roller a and the roller b, which is conducive to reducing the size of the base.
[0016] Further preferably, the support rod a and the support rod b are equal in length, which is conducive to uniform force on the base.
[0017] Further preferably, the straightening rope is made of steel wire.
[0018] Further preferably, the counterweight a and the counterweight b are provided with through holes for the straightening rope to pass through, and the through holes are used to fix the straightening rope and the counterweight.
[0019] The utility model uses a counterweight to straighten the steel wire, and ensures that the steel wire is always in a straightened state during the entire solution aging process through a roller, thereby preventing the spring from bending and deforming. At the same time, the spring of the utility model is placed horizontally in the furnace to avoid height deviation of the spring. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings herein are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0022] Figure 1 Schematic diagram of a compression spring.
[0023] Figure 2 A schematic diagram showing a prior art method of loading a compression spring horizontally into a furnace.
[0024] Figure 3 A schematic diagram showing a conventional compression spring placed vertically in a furnace.
[0025] Figure 4It shows the structural diagram of the utility model.
[0026] Figure 5 Shows a schematic diagram of the furnace installation of the present invention.
[0027] In the figure: 1-straightening rope, 21-roller a, 22-roller b, 31-counterweight a, 32-counterweight b, 41-support rod a, 42-support rod b, 5-base, 6-spring. DETAILED DESCRIPTION
[0028] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.
[0029] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms based on specific circumstances.
[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.
[0031] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0032] A flexible tooling for preventing deformation of an ultra-long high-precision spring during solid solution aging (hereinafter referred to as the flexible tooling) includes a straightening rope 1, a roller a21, and a roller b22. A counterweight a31 is provided at one end of the straightening rope 1, and a counterweight b32 is provided at the other end. The straightening rope 1 passes through the rollers a21 and b22 in sequence. The roller a21 is rotatably connected to the support rod a41, and the roller b22 is rotatably connected to the support rod b42. The rollers a21 and b22 are at the same horizontal height. The support rods a41 and b42 are fixedly connected to the base 5. Figure 4 As shown, the support rod a41 and the support rod b42 are fixed on the base 5 at a certain angle, the straightening rope 1 is made of steel wire, and the counterweight a31 and the counterweight b32 are provided with through holes for the straightening rope 1 to pass through.
[0033] The working principle is:
[0034] 1. Insert the steel wire into the inner hole of spring 6 and add counterweights at both ends of the wire;
[0035] 2. Place the steel wire, spring 6, and counterweight on the roller of the flexible tooling;
[0036] 3. The steel wire is straightened under the gravity of the counterweight, thereby driving the spring 6 to a straight state;
[0037] 4. Place multiple springs 6 on the rollers and heat them in a furnace;
[0038] 5. During the heating, heat preservation and cooling processes, due to the presence of the counterweight, the steel wire is always in a straightened state, thereby preventing the spring 6 from bending and ensuring the straightness requirements of the spring 6;
[0039] 6. After being taken out of the oven, remove the spring 6 from the tooling. During the process of removing the spring 6, prevent the spring 6 from being bent by external forces, thereby affecting the straightness.
[0040] Using the above technical solution, flexible tooling was processed and equipped with counterweights of different weights and φ0.5mm stainless steel wire. 20 springs 6 were processed and their straightness was tested as shown in the following table.
[0041]
[0042] As can be seen from the table, of the 20 springs 6 treated with the present invention, 5 of the 30g counterweight springs 6 had straightness exceeding 0.5mm, failing to meet the standards. The remaining springs 6 with 40g, 50g, and 60g counterweights all passed the test, but the spring 6 with the 60g counterweight had the highest straightness. Testing the diameter of the 0.5mm stainless steel wire revealed that it remained at 0.5mm, showing no signs of thinning. This demonstrates that using a counterweight of less than 60g will not cause the wire to become thinner or even break. Therefore, for this spring 6, selecting a 0.5mm stainless steel wire + 60g counterweight will produce a qualified spring 6, demonstrating that the designed flexible tooling can meet the requirements.
[0043] The utility model uses a counterweight to straighten the steel wire, and ensures that the steel wire is always in a straightened state during the entire solution aging process through a roller, thereby preventing the spring 6 from bending and deforming.
[0044] The present invention can also be applied to other processing processes of ultra-long high-precision springs 6 that require solid solution aging or quenching and tempering. However, due to the different aspect ratios and weights of different springs 6, it is necessary to consider the selection of different steel wires and counterweights to produce qualified springs 6.
[0045] The above description is only a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments, and they should all be covered by the scope of protection of the claims.
Claims
1. Flexible fixture to prevent deformation of ultra-long high-precision springs during solid solution aging, characterized by: The invention comprises a straightening rope (1), a roller a (21) and a roller b (22), wherein one end of the straightening rope (1) is provided with a counterweight a (31) and the other end is provided with a counterweight b (32), the straightening rope (1) passes through the roller a (21) and the roller b (22) in sequence, the roller a (21) is rotatably connected to the support rod a (41), and the roller b (22) is rotatably connected to the support rod b (42), the roller a (21) and the roller b (22) are at the same horizontal height, and the support rod a (41) and the support rod b (42) are fixedly connected to a base (5).
2. The flexible tooling for preventing the deformation of ultra-long high-precision springs during solid solution aging according to claim 1 is characterized in that: The connection portion between the support rod a (41) and the support rod b (42) and the base (5) is between the roller a (21) and the roller b (22).
3. The flexible tooling for preventing the deformation of ultra-long high-precision springs during solid solution aging according to claim 2 is characterized in that: The support rod a (41) and the support rod b (42) are of equal length.
4. The flexible tooling for preventing the deformation of ultra-long high-precision springs during solid solution aging according to claim 1 is characterized in that: The straightening rope (1) is made of steel wire.
5. The flexible tooling for preventing the deformation of an ultra-long high-precision spring during solid solution aging according to any one of claims 1 to 4, characterized in that: The counterweight a (31) and the counterweight b (32) are provided with through holes through which the straightening rope (1) passes.