Manufacturing method of carbon steel barrel-shaped nut for aviation
Through processes such as machine addition molding, heat treatment and magnetic flaw detection, the problem of threaded teeth is solved, the accuracy and performance of barrel nuts are improved, and the high requirements of carbon steel barrel nuts for aviation are met.
Patent Information
- Application Number
- CN202411331953.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-01-07
AI Technical Summary
During the manufacturing process of existing barrel nuts, threaded teeth are prone to defects of rotten teeth and irregular teeth shapes, which affects the performance and reliability of the product.
Precision processing is carried out using machine-adding process, combined with heat treatment, magnetic flaw detection and surface treatment, to ensure that the dimensional accuracy and performance of the nut meet the design requirements and meet the standard requirements through performance tests.
It realizes high-precision molding and performance improvement of nuts, avoids the problem of rotten teeth of threaded teeth, enhances corrosion resistance and reliability, and meets the unique application environment and performance requirements of carbon steel barrel nuts for aviation.
Smart Images
Figure CN119260310A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of electromagnetic wave absorption, and in particular to a method for manufacturing a carbon steel barrel nut for aviation. Background Art
[0002] The barrel nut is a fastener widely used in the fields of machinery and aviation, and has a variety of uses. The barrel nut is usually composed of a self-locking nut and a retainer, which are installed in a barrel, and the hanging plates at both ends of the retainer are hung on the edge of the barrel. This design helps to improve the reliability of the connector and facilitates maintenance. The manufacture of the barrel nut in the prior art is cast by coated sand casting technology, and then the manufacturing process of screws and nuts is used for the production of the barrel nut, including forging and rolling. The disadvantage is that the thread teeth are prone to rotten teeth and irregular tooth shape defects. Summary of the invention
[0003] The object of the present invention is to overcome the above-mentioned disadvantages and provide a method for manufacturing a carbon steel barrel nut for aviation use which meets all performance and size requirements and does not cause thread tooth decay or irregular thread shape.
[0004] The purpose of the present invention and the solution of its main technical problems are achieved by adopting the following technical solutions: A method for manufacturing a carbon steel barrel nut for aviation of the present invention comprises the following steps: 1) Machining: The square dimensions, outer circle, thread locking hole, total length, thread bottom hole and thread are milled together, and after cutting, the cut end is countersunk, burrs are removed, and then the end is closed; 2) Heat treatment: Use vacuum oil quenching furnace for quenching, oil cooling, and vacuum tempering furnace for tempering to obtain products with strength of σb=1100MPa-1280Mpa; 3) Magnetic flaw detection: Use magnetic detection to inspect the product surface to ensure there are no defects that affect product performance; 4) Surface treatment: Electroplating and cadmium plating passivation isolate the product surface from the air and increase the product's wear resistance and corrosion resistance; 5) Performance test: Through load test, hardness test, torque-preload relationship test, fatigue strength test, the product design standard requirements are met, the expected effect is achieved, and the product manufacturing is completed.
[0005] The quenching temperature described in step 2) is 850±10℃.
[0006] The vacuum tempering described in step 2) is tempering at 480-540±10°C.
[0007] Compared with the prior art, the present invention has obvious beneficial effects. From the above technical scheme, it can be seen that the present invention uses precision machine tools to machine the barrel nut to ensure that the dimensional accuracy and shape of the nut meet the design requirements. Heat treatment is used to improve the corrosion resistance and mechanical properties of the nut. Magnetic flaw detection is used to check the surface and near-surface defects of ferromagnetic materials. The arch edge of the cage is abnormally formed or interferes. Surface treatment is intended to enhance the corrosion resistance and appearance quality of the nut. And improve the practicality and reliability of the nut. To adapt to its unique application environment and performance requirements. It has achieved meeting all performance and size requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 is a process flow chart of the present invention; Figure 2 The barrel nut structure of the present invention is schematically shown in FIG. Figure 1 ; Figure 3 The barrel nut structure of the present invention is schematically shown in FIG. Figure 2 . DETAILED DESCRIPTION
[0010] The specific implementation methods, structures, features and functions of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.
[0011] Example 1 A method for manufacturing a carbon steel barrel nut for aviation of the present invention comprises the following steps: 1) Machining: The square dimensions, outer circle, thread locking hole, total length, thread bottom hole and thread are milled together, and after cutting, the cut end is countersunk, burrs are removed, and then the end is closed; 2) Heat treatment: Use vacuum oil quenching furnace for quenching, quenching at 850±10℃, oil cooling, vacuum tempering furnace and then tempering at 480-540±10℃ to obtain products with σb=1100MPa-1280Mpa strength; 3) Magnetic flaw detection: Use magnetic detection to inspect the product surface to ensure there are no defects that affect product performance; 4) Surface treatment: Electroplating and cadmium plating passivation isolate the product surface from the air and increase the product's wear resistance and corrosion resistance; 5) Performance test: Through load test, hardness test, torque-preload relationship test, fatigue strength test, the product design standard requirements are met, the expected effect is achieved, and the product manufacturing is completed.
[0012] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.
Claims
1. A method for manufacturing a carbon steel barrel nut for aviation, comprising the following steps: 1) Machining: The square dimensions, outer circle, thread locking hole, total length, thread bottom hole and thread are milled together, and after cutting, the cut end is countersunk, burrs are removed, and then the end is closed; 2) Heat treatment: Use vacuum oil quenching furnace for quenching, oil cooling, and vacuum tempering furnace for tempering to obtain products with strength of σb=1100MPa-1280Mpa; 3) Magnetic flaw detection: Use magnetic detection to inspect the product surface to ensure there are no defects that affect product performance; 4) Surface treatment: Electroplating and cadmium plating passivation isolate the product surface from the air and increase the product's wear resistance and corrosion resistance; 5) Performance test: Through load test, hardness test, torque-preload relationship test, fatigue strength test, the product design standard requirements are met, the expected effect is achieved, and the product manufacturing is completed.
2. A method for manufacturing a carbon steel barrel nut for aviation use as claimed in claim 1, wherein: The quenching temperature described in step 2) is 850±10°C.
3. A method for manufacturing a carbon steel barrel nut for aviation use as claimed in claim 1, wherein: The vacuum tempering described in step 2) is tempering at 480-540±10°C.