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Precision assembly method for interference fit part at liquid hydrogen temperature zone

An interference fit and assembly method technology, applied in metal processing, metal processing equipment, manufacturing tools, etc., can solve problems such as assembly difficulties, and achieve the effects of avoiding surface oxidation, multi-parameter adjustable assembly pressure, and avoiding surface frosting

Inactive Publication Date: 2017-05-31
BEIJING INST OF AEROSPACE TESTING TECH +1
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AI Technical Summary

Problems solved by technology

[0005] The invention aims at the problem of difficult assembly when the interference is large in the existing assembly technology of interference fit parts, and can effectively reduce the external force of press fitting, improve assembly quality, and reduce damage to parts

Method used

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Embodiment Construction

[0011] The invention adopts an assembly method of interference fit and rigid connection. First, rinse the hole parts with deionized water, and then rinse with 5% sodium hydroxide aqueous solution three times to remove the surface grease. After drying with absorbent cotton, put it in a vacuum muffle furnace and vacuum to the furnace. The internal absolute pressure is lower than 1000Pa, and the drying is carried out at a temperature of 350K to 360K for 2h. After drying, keep the vacuum in the furnace, raise the temperature in the furnace to above 600K, and heat for 6 hours. After the heating is stopped, the parts continue to be placed in the vacuum muffle furnace, and nitrogen gas is introduced into the muffle furnace to reach normal pressure to prevent oxidation of the parts.

[0012] Use saturated aqueous solution of sodium dodecyl benzene sulfonate to clean the shaft parts, dry with absorbent cotton, put it in a vacuum muffle furnace, evacuate until the absolute pressure in the...

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Abstract

The invention discloses a precision assembly method for an interference fit part at the liquid hydrogen temperature zone. The precision assembly method comprises the following steps: a hole part is subjected to vacuumizing heating treatment, a shaft part is subjected to low temperature medium soaking treatment, and during assembly, the shaft part is pressed into the hole part on an electromagnetic vibrating table by using the longitudinal coupling vibrating strengthening principle, thereby completing the assembly. With the adoption of the precision assembly method, the press fitting external force can be reduced effectively, the assembly quality can be improved, and the part damage can be reduced. The precision assembly method is a fine and high-quality assembly method.

Description

Technical field [0001] The invention relates to the manufacturing field of low-temperature heat exchangers in refrigeration and low-temperature engineering, in particular to an assembly method for interference fit of small workpieces, and is particularly suitable for interference fit of precision shaft-shaped components and installation holes. Background technique [0002] In industrial production and equipment manufacturing, there are two main processes for interference fit, namely external force pressing and thermal expansion and contraction. Use external force press-in method for interference assembly operation. This method generally uses mechanical vibration, ultrasonic vibration, manual, hydraulic and other methods to provide power to connect the interference mechanical parts together. The pressure load that this method can withstand has certain limitations. If the interference is large, it is difficult to apply pressure. It is necessary to heat or freeze the parts in advanc...

Claims

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Application Information

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IPC IPC(8): B23P11/02
CPCB23P11/025
Inventor 兰玉岐王东方安刚李山峰尚宇黄岸光赵珊珊李星
Owner BEIJING INST OF AEROSPACE TESTING TECH
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