Hexagon head bolt auxiliary disassembly method

Abstract

The application provides an auxiliary disassembly method for hexagonal head bolts, and belongs to the technical field of aviation manufacturing and maintenance. The method can reduce the difficulty of disassembling hexagonal head bolts with a hexagonal head size lower than the design size given tolerance, improve work efficiency, and reduce damage of the hexagonal head bolts in the disassembly process. Meanwhile, the method is simple and convenient in operation, can meet the actual requirements of an aircraft maintenance site, and has no excessive environmental restrictions. The method does not cause corrosion of the hexagonal head bolts, and does not cause personal safety problems and environmental pollution of an operator. The method can meet the requirements of an aircraft maintenance cycle in operation time.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aviation manufacturing and maintenance, and relates to a hexagonal head bolt auxiliary disassembly method. BACKGROUND

[0002] Some aviation product fasteners adopt a large number of hexagonal head bolts in the installation process. Due to the wear of the bolt head in daily maintenance and use, the size of the hexagonal head bolt head is often lower than the design size given tolerance. When a wrench matching the size of the bolt is used for disassembly, the wrench often slips and cannot normally disassemble the bolt. In this case, a pneumatic tool is usually used to impact the hexagonal head of the bolt to generate torque on the bolt so as to disassemble the bolt. However, this method is difficult to operate, and if the pneumatic tool is not operated properly, the structure around the hexagonal head bolt can be damaged.

[0003] Based on this, the hexagonal head bolt auxiliary disassembly method is provided in the application to reduce the difficulty of disassembling the hexagonal head bolt with the size of the hexagonal head lower than the design size given tolerance, improve work efficiency, and reduce damage to the hexagonal head bolt in the disassembly process. SUMMARY

[0004] In view of the above problems, the hexagonal head bolt auxiliary disassembly method is provided.

[0005] The technical scheme of the application is as follows:

[0006] The hexagonal head bolt auxiliary disassembly method comprises the following steps:

[0007] Step 1) The hexagonal head of the bolt is cleaned with anhydrous ethanol and then dried in a natural state.

[0008] Step 2) Preparation of disassembly auxiliary paste

[0009] According to the mass fraction, 6 parts (100-300 mesh) of silicon carbide, 4 parts of edible cassava starch, 1 part of water, 0.5-1.5 parts of copper sulfate, and 0.5 parts of industrial sodium carbonate are selected. At room temperature, edible cassava starch 2 parts, water 1 part, and industrial sodium carbonate 0.5 parts are added in a glass container in sequence. Then the solution is heated to 80℃ within 5 minutes, and then the heating is stopped. While heating, uniform stirring is carried out at a stirring speed of 40 r / min for 10 min. After the stirring is completed, all the selected copper sulfate, 6 parts of silicon carbide and the remaining 2 parts of edible cassava starch are put into the solution for continuous stirring for 5 min at a stirring speed of 20 r / min. After the stirring is completed, the solution is left to stand at room temperature for 24 h, and the solution is converted into a paste form.

[0010] Step 3) dip the sleeve of the sleeve wrench into the paste prepared in step 2) to make the paste adhere to the inner wall of the sleeve; then use the sleeve wrench to disassemble the hex head bolt whose hex head size is lower than the design size given tolerance, prevent the hex head bolt from small angle deviation in the sleeve during disassembly and fixing, and compensate the difference; meanwhile, the paste can be wiped clean with degreasing cotton after the disassembly is completed because the paste has no strong flowability.

[0011] The method of the present application is simple and convenient in operation, can be applied to the actual requirements of aircraft maintenance site, and has no excessive environmental restrictions; the present application will not cause corrosion to the hex head bolt, and will not cause personal safety problems and environmental pollution to the operator; the present application can meet the requirements of the aircraft maintenance cycle in operation time. DETAILED DESCRIPTION

[0012] The specific embodiments of the present application will be described in detail below in combination with the technical solutions.

[0013] The present application proposes a hex head bolt auxiliary disassembly method, which comprises the following steps:

[0014] Step 1) clean the hex head of the bolt with anhydrous ethanol, and then dry it in a natural state.

[0015] Step 2) prepare a disassembly auxiliary paste

[0016] According to the mass fraction, select 6 parts (100 mesh) of silicon carbide, 4 parts of edible cassava starch, 1 part of water, 1.2 parts of copper sulfate, and 0.5 parts of industrial sodium carbonate. At room temperature, add edible cassava starch 2 parts, water 1 part, and industrial sodium carbonate 0.5 parts in a glassware in sequence; then heat the solution to 80℃ within 5 minutes, and then stop heating. While heating, stir at a uniform speed for 10 minutes, and the stirring speed is 40 r / min. After the stirring is completed, put all the selected copper sulfate, 6 parts of silicon carbide and the remaining 2 parts of edible cassava starch into the solution and continue to stir for 5 minutes at a stirring speed of 20 r / min; after the stirring is completed, stand for 24 hours at room temperature, and the solution is changed into a paste shape. The combination of ingredients and the preparation method can better complete the solidification of edible cassava starch, and make the auxiliary paste better adhere to the silicon carbide.

[0017] Step 3) dip the sleeve of the sleeve wrench into the paste prepared in step 2) to make the paste adhere to the inner wall of the sleeve; then use the sleeve wrench to disassemble the hex head bolt whose hex head size is lower than the design size given tolerance.

[0018] Example 1

[0019] According to the disassembly site work condition, select three kinds of commonly used size out-of-tolerance bolts for disassembly comparison statistics by multiple operators.

[0020] Operators: 10 operators with more than 5 years repairing experience are selected.

[0021] Operation objects: three kinds of bolts with hexagon head and 8mm, 10mm and 12mm distance between opposite sides are selected for disassembly verification.

[0022] Operation environment: room temperature working site is selected, indoor temperature is 20℃-23℃, humidity is 50%-75%, illumination is 600lx. Temperature, humidity and illumination all meet the normal airplane disassembly working site repairing requirements.

[0023] Comparison method:

[0024] 1) 10 operators are divided into 10 groups, three kinds of bolts with hexagon head and 8mm, 10mm and 12mm distance between opposite sides are disassembled and counted, and the time and disassembly effect after disassembly by using ordinary pneumatic tool and the method provided by the application are compared. The disassembly effect of pneumatic tool is shown in Table 1.

[0025] Table 1

[0026]

[0027]

[0028] Operation result analysis: when the pneumatic tool is used to disassemble the out-of-tolerance bolt, the disassembly time is long, because the impact force of the pneumatic tool is large and not easy to control, and the surrounding accessories of the bolt are easily damaged.

[0029] 2) according to the operation method in the application, 10 operators are selected to use the operation method in the application to operate the same object samples, and the same inspection is made after disassembly, and the detailed results are shown in Table 2.

[0030] Table 2

[0031]

[0032]

[0033] Operation result analysis: after using the disassembly method of the application, the operation time is obviously shortened, and the surrounding accessories of the bolt are not damaged due to disassembly of the bolt.

Claims

1. A method for assisting in the disassembly of a hexagonal head bolt, characterized in that, The method includes the following steps: Step 1) Clean the hexagonal head of the bolt with anhydrous ethanol and then let it air dry. Step 2) Prepare the decomposition aid paste By mass, select 6 parts silicon carbide, 4 parts edible cassava starch, 1 part water, 0.5-1.5 parts copper sulfate, and 0.5 parts industrial sodium carbonate. At room temperature, add 2 parts edible cassava starch, 1 part water, and 0.5 parts industrial sodium carbonate to a glass container. Then heat the solution to 80°C within 5 minutes and stop heating. Stir at a constant speed for 10 minutes while heating. After stirring, add all the selected copper sulfate, 6 parts silicon carbide, and the remaining 2 parts edible cassava starch to the solution and continue stirring for 5 minutes. After stirring, let it stand at room temperature for 24 hours until the solution transforms into a paste. Step 3) Dip the socket of the socket wrench into the paste prepared in step 2) and make the paste adhere to the inner wall of the socket; then use the socket wrench to disassemble the hexagonal head bolt whose hexagonal head size is lower than the given tolerance of the design size.

2. The method for assisted disassembly of a hexagonal head bolt according to claim 1, characterized in that, The silicon carbide used is selected from 100 to 300 mesh.

Images