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Fe-Mn-Si shape memory alloy check bolt and manufacturing and using methods thereof

A fe-mn-si, memory alloy technology, used in bolts, screws, nuts and other directions, can solve the problems of changing the nature of detachable connections, inconvenient use, high cost and difficult to promote, etc., to achieve good self-locking anti-loosening performance, Easy to install effect

Inactive Publication Date: 2013-05-15
DALIAN MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as ST2 type anti-loosening nuts, concave-convex type anti-loosening nuts, wedge self-locking nuts, keyed anti-loosening nuts, etc. Although these anti-loosening methods have achieved certain anti-loosening effects under certain working conditions, they still have limited anti-loosening performance. It is not very reliable, or it is inconvenient to use because of the need for auxiliary parts and auxiliary processing, or it fundamentally changes the nature of the detachable connection, or it is difficult to promote because of the high cost

Method used

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  • Fe-Mn-Si shape memory alloy check bolt and manufacturing and using methods thereof
  • Fe-Mn-Si shape memory alloy check bolt and manufacturing and using methods thereof
  • Fe-Mn-Si shape memory alloy check bolt and manufacturing and using methods thereof

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with specific embodiments.

[0039] Select smelting raw materials and mix according to the following ratio (mass percentage of chemical components):

[0040] Mn: 16.86%; Si: 4.50%; Cr: 10.30%; Ni: 5.29%; Vacuum ZG-0.025 thyristor intermediate frequency induction melting furnace smelting, the vacuum degree is 10 -2 Torr. After the raw material is melted and kept warm for 30 minutes to make it even, cast it into a 15Kg ingot in a metal mold. In order to eliminate the inhomogeneity of the composition of the ingot, after the ingot is homogenized and annealed at 1200°C for 24 hours, the surface scale is removed, the cap is cut off, and then heated to 1100°C for 1 hour and then hot forged. For round bar blanks, the initial forging temperature is 1050°C, and the final forging temperature is not lower than 900°C; wire and straighten it.

[0041] The process of machining Fe-Mn-Si shape memory alloy bol...

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Abstract

The invention discloses a Fe-Mn-Si shape memory alloy check bolt and manufacturing and using methods thereof. The Fe-Mn-Si shape memory alloy check bolt is characterized by comprising the following ingredients by weight percent: 0.02-1.2% of C, 13-24.9% of Mn, 2-6% of Si, 1-7% of Ni, 0.5-12% of Cr, 0-2% of V and the balance of Fe. The performance of the check block provided by the invention is superior to that of a common bolt; and the check bolt has good anti-loosening effect, and is especially suitable for the occasions that the internal operation space of a machine is small and thread connection of other anti-loosening measures cannot be easily carried out.

Description

technical field [0001] The invention relates to a Fe-Mn-Si shape memory alloy anti-loosening bolt and its manufacturing and application methods. Background technique [0002] Threaded connection is one of the commonly used connection methods for modern structures and mechanical equipment. Generally, threaded connections have self-locking properties, but when subjected to large vibration, variable load, impact or temperature changes, threaded connections are prone to loosening, loosening, and fatigue fracture, resulting in connection failure. [0003] The use practice, anti-loosening performance test and fatigue strength test of threaded connections prove that loosening failure is one of the main failure modes of threaded connections under alternating loads. Loosening will cause the connection pretightening force to decrease or even lose, making the connection invalid and causing accidents. The main reason for the loosening of the threaded connection is that there is a cert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D7/02C21D7/13C21D8/00C21D8/06F16B39/02
Inventor 林成新刘志杰刘林林郭宝喜
Owner DALIAN MARITIME UNIVERSITY
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