Shape memory alloy check nut and manufacturing technique
A technology of memory alloy and anti-loosening nut, which is applied in the direction of nuts, screws, bolts, etc., can solve the problems of pre-tightening force drop, equipment failure, and connection pre-tightening force reduction, so as to eliminate the gap, prevent the loss of recovery amount, The effect of reducing the gap
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Embodiment 1
[0028] Embodiment 1: The material of the present invention is composed of the following components in parts by weight: C 0.01', Mn 15.0, Si 4.8, Cr 9.0, Ni 7.0, P 0.01, S 0.01, N 0.03, Fe 63.55.
[0029] The production process of the present invention: (1) prepare materials according to the above-mentioned composition requirements, and smelt and roll them into iron-based shape memory alloy rods with outer hexagons and inner round holes;
[0030] (2) Carry out solid solution treatment to the bar stock: heat preservation at 950K for 30min;
[0031] (3) Carry out shape memory training to bar stock;
[0032] (4) Cut the bar stock into nut hair damage, and process the inner round hole according to 95% of the specified size;
[0033] (5) Reaming the nut to a standard size to realize the stress-induced martensitic transformation of the nut;
[0034] (6) The finishing of the internal thread ensures that the internal thread has a certain accuracy, reduces the gap of fit, and effectiv...
Embodiment 2
[0036] Embodiment 2: The material of the present invention is composed of the following components in parts by weight: C 0.03, Mn 17.0, Si 5.0, Cr 8.5, Ni 6.5, P 0.02, S 0.02, N 0.04, Fe 60.65.
[0037] The production process of the present invention: (1) prepare materials according to the above-mentioned composition requirements, and smelt and roll them into iron-based shape memory alloy rods with outer hexagons and inner round holes;
[0038] (2) Carry out solid solution treatment to the bar stock: heat preservation at 1000K for 45min;
[0039] (3) Carry out shape memory training to bar stock;
[0040] (4) Cut the bar stock into nut hair damage, and process the inner round hole according to 96% of the specified size;
[0041] (5) Reaming the nut to a standard size to realize the stress-induced martensitic transformation of the nut;
[0042] (6) The finishing of the internal thread ensures that the internal thread has a certain accuracy, reduces the gap of fit, and effectiv...
Embodiment 3
[0044] Embodiment 3: The material of the present invention is composed of the following components in parts by weight: C 0.05, Mn 16.0, Si 5.2, Cr 9.5, Ni 7.5, P 0.03, S 0.015, N 0.05, Fe 65.05.
[0045] The production process of the present invention: (1) prepare materials according to the above-mentioned composition requirements, and smelt and roll them into iron-based shape memory alloy rods with outer hexagons and inner round holes;
[0046] (2) Perform solid solution treatment on the bar: keep it warm at 1150K for 60min;
[0047] (3) Carry out shape memory training to bar stock;
[0048] (4) Cut the bar stock into nut hair damage, and process the inner round hole according to 94% of the specified size;
[0049] (5) Reaming the nut to a standard size to realize the stress-induced martensitic transformation of the nut;
[0050] (6) The finishing of the internal thread ensures that the internal thread has a certain accuracy, reduces the gap of fit, and effectively prevents...
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