Carburizing heat treatment anti-seepage protection assistive device and method
By using a combination of wrapping and clamping parts at the spline and thread positions of gear parts, the carburizing problem at the spline and thread positions in the carburizing process is solved, achieving a low-cost and reusable carburizing effect.
Patent Information
- Application Number
- CN202510884504.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-11-14
AI Technical Summary
Existing technologies cannot effectively prevent the splines and threads of gear parts from being carburized during the carburizing process, resulting in high costs and the inability to reuse them.
The combination of wrapping and clamping components physically isolates the splines and threads of gear-like parts through wrapping. The front and rear sealing plates are made of ferrous metal and are tightened with bolts and nuts. Soft glass fiber gaskets and copper plating are used to prevent carburization.
It achieves effective isolation of spline and thread positions during carburizing heat treatment, reducing costs and improving process safety and reusability.
Smart Images
Figure CN120945314A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a protective device and method for preventing seepage during carburizing heat treatment. Background Technology
[0002] In machine component design, to improve the wear resistance of friction surfaces, surface carburizing (nitriding and cyaniding) is used to increase hardness. However, surface carburizing (nitriding and cyaniding) is avoided in other areas to ensure toughness and impact resistance. For example, in gear parts, the tooth surface needs to be hardened by carburizing (nitriding and cyaniding), while splines and threads are protected from surface carburizing (nitriding and cyaniding). Currently, methods such as copper plating, applying anti-seepage coatings (low cost but prone to localized leakage), and leaving a protective layer (to be removed after carburizing) are used to achieve carburizing of the tooth surface and avoid carburizing of splines and threads. However, these methods cannot be reused and are costly. Summary of the Invention
[0003] To address the aforementioned technical problems, this invention provides a simple and reliable anti-seepage protection accessory for carburizing heat treatment, and also provides a corresponding anti-seepage protection method for carburizing heat treatment.
[0004] The technical solution of the present invention to solve the above-mentioned technical problems is: a carburizing heat treatment anti-seepage protective auxiliary tool, including a wrapping component and a clamping component. The wrapping component wraps around both sides of the tooth blank hub surface and is clamped by the clamping component, thereby achieving physical isolation by wrapping.
[0005] The aforementioned anti-seepage protective accessory for carburizing heat treatment includes a front sealing plate and a rear sealing plate, both of which are conical in shape. The front sealing plate and the rear sealing plate are symmetrically arranged on both sides of the tooth blank hub surface, and the front sealing plate and the rear sealing plate are pressed against the tooth blank hub surface by a clamping member.
[0006] The aforementioned anti-seepage protective accessories for carburizing heat treatment use bolts and nuts as clamping components.
[0007] The aforementioned anti-seepage protective accessories for carburizing heat treatment are equipped with soft glass fiber sealing gaskets between the front sealing plate and the tooth blank hub surface, between the rear sealing plate and the tooth blank hub surface, between the clamping component and the front sealing plate, and between the clamping component and the rear sealing plate.
[0008] In the aforementioned anti-seepage protective accessories for carburizing heat treatment, the bottom diameters of the front and rear sealing plates are equal to the diameter of the tooth blank hub surface.
[0009] The aforementioned anti-seepage protective accessories for carburizing heat treatment, wherein the wrapping and clamping parts are made of ferrous metal.
[0010] The aforementioned carburizing heat-treated anti-seepage protective accessories, the surfaces of the wrapping parts and the clamping parts are all copper-plated.
[0011] A method for preventing seepage during carburizing heat treatment includes the following steps:
[0012] Step 1: After attaching the front and rear sealing plates to the gear blank hub surface using soft fiberglass sealing gaskets, tighten the front and rear sealing plates with bolts and nuts.
[0013] Step 2: Preheat to 50°C~100°C to expel air from the sealed cavity formed between the front sealing plate, the rear sealing plate, and the through hole in the gear.
[0014] Step 3: After tightening the nuts, place the front sealing plate, rear sealing plate, and gear into the furnace for carburizing. Carburizing is performed on the surface of the gear teeth, but carburizing of the wrapped parts on the hub surface of the gear blank cannot be achieved.
[0015] In the above-mentioned carburizing heat treatment method for preventing seepage, the carburizing temperature in step three is 790°C to 830°C.
[0016] In the above-mentioned carburizing heat treatment anti-seepage protection method, in step three, the tightening torque of the bolts and nuts is calculated to avoid air leakage in the sealing cavity caused by thermal expansion.
[0017] The beneficial effects of the present invention are as follows: The auxiliary tool of the present invention includes a wrapping component and a clamping component. The wrapping component wraps around both sides of the tooth blank hub surface and is clamped by the clamping component. When used in the carburizing (nitriding and cyaniding) heat treatment process, the wrapping method is used to physically isolate the parts of the parts that need to avoid surface carburizing (nitriding and cyaniding), which can meet the actual needs. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the anti-seepage protective accessory for carburizing heat treatment according to the present invention.
[0019] Figure 2 This is a schematic diagram of the front sealing plate of the present invention.
[0020] Figure 3 This is a schematic diagram of the rear sealing plate mechanism of the present invention. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] like Figures 1-3 As shown, a protective accessory for preventing seepage during carburizing heat treatment includes a wrapping component and a clamping component 1. The wrapping component is wrapped around both sides of the gear blank hub surface (i.e., the spline and thread position of the gear) and clamped by the clamping component 1, thereby achieving physical isolation by wrapping.
[0023] The package includes a front sealing plate 3 and a rear sealing plate 4, both of which are conical in shape. The front sealing plate 3 and the rear sealing plate 4 are symmetrically arranged on both sides of the gear blank hub surface. The front sealing plate 3 and the rear sealing plate 4 are pressed against the gear blank hub surface by a clamping member 1. The clamping member 1 is a bolt and nut.
[0024] A soft glass fiber sealing gasket 2 is provided between the front sealing plate 3 and the tooth blank hub surface, between the rear sealing plate 4 and the tooth blank hub surface, between the clamping member 1 and the front sealing plate 3, and between the clamping member 1 and the rear sealing plate 4. The bottom diameter of the front sealing plate 3 and the rear sealing plate 4 is equal to the diameter of the tooth blank hub surface.
[0025] The package and clamping component 1 are made of ferrous metal.
[0026] To prevent co-diffusion during carburizing (nitriding and cyaniding) of the accessories and the product, the surfaces of the wrapping and clamping parts 1 are copper-plated to prevent them from becoming brittle.
[0027] A method for preventing seepage during carburizing heat treatment includes the following steps:
[0028] Step 1: After pressing the front sealing plate 3 and rear sealing plate 4 tightly against the surface of the gear blank hub using the soft glass fiber sealing gasket 2, tighten the front sealing plate 3 and rear sealing plate 4 with bolts and nuts.
[0029] Step 2: Preheat to 50°C~100°C to expel air from the sealed cavity formed between the front sealing plate 3, the rear sealing plate 4, and the intermediate through hole of the gear;
[0030] Step 3: After tightening the nuts, place the front sealing plate 3, rear sealing plate 4, and gear into the furnace for carburizing. Carburizing is performed on the surface of the gear teeth; carburizing of the surface of the part wrapped on the hub surface of the gear blank cannot be achieved. The carburizing temperature is 790°C to 830°C. Calculate the tightening torque of the bolts and nuts to avoid air leakage in the sealing cavity due to thermal expansion.
[0031] This invention can be used in conjunction with anti-seepage coatings, resulting in higher process safety; the physical isolation method using wrapping is simple to operate, the auxiliary tools are easy to manufacture, and the effect is ideal.
Claims
1. A protective accessory for preventing seepage during carburizing heat treatment, characterized in that: It includes a wrapping component and a clamping component. The wrapping component wraps around both sides of the tooth blank hub surface and is clamped by the clamping component, thus achieving physical isolation through wrapping.
2. The anti-seepage protective accessory for carburizing heat treatment according to claim 1, characterized in that: The package includes a front sealing plate and a rear sealing plate, both of which are conical in shape. The front sealing plate and the rear sealing plate are symmetrically arranged on both sides of the tooth blank hub surface. The front sealing plate and the rear sealing plate are pressed against the tooth blank hub surface by a clamping member.
3. The anti-seepage protective accessory for carburizing heat treatment according to claim 2, characterized in that: The clamping components are bolts and nuts.
4. The anti-seepage protective accessory for carburizing heat treatment according to claim 2, characterized in that: Soft glass fiber sealing gaskets are provided between the front sealing plate and the tooth blank hub surface, between the rear sealing plate and the tooth blank hub surface, between the clamping component and the front sealing plate, and between the clamping component and the rear sealing plate.
5. The anti-seepage protective accessory for carburizing heat treatment according to claim 2, characterized in that: The bottom diameters of the front and rear sealing plates are equal to the diameter of the wheel hub surface of the gear blank.
6. The anti-seepage protective accessory for carburizing heat treatment according to claim 2, characterized in that: The package and clamping components are made of ferrous metal.
7. The anti-seepage protective accessory for carburizing heat treatment according to claim 2, characterized in that: Both the package and the clamping component are copper-plated.
8. A method for preventing seepage during carburizing heat treatment, implemented based on the carburizing heat treatment seepage prevention and protection auxiliary equipment as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: After attaching the front and rear sealing plates to the gear blank hub surface using soft fiberglass sealing gaskets, tighten the front and rear sealing plates with bolts and nuts. Step 2: Preheat to 50°C~100°C to expel air from the sealed cavity formed between the front sealing plate, the rear sealing plate, and the through hole in the gear. Step 3: After tightening the nuts, place the front sealing plate, rear sealing plate, and gear into the furnace for carburizing. Carburizing is performed on the surface of the gear teeth, but carburizing of the wrapped parts on the hub surface of the gear blank cannot be achieved.
9. The method for preventing seepage during carburizing heat treatment according to claim 8, characterized in that, In step three, the carburizing temperature is 790°C to 830°C.
10. The method for preventing seepage during carburizing heat treatment according to claim 8, characterized in that, In step three, the tightening torque of the bolts and nuts is calculated to prevent air leakage in the sealing cavity caused by thermal expansion.