Bobtail high-strength rivet connection pair and manufacturing method thereof
A manufacturing method and rivet connection technology, applied to rivets, manufacturing tools, furnaces, etc., can solve the problems of high-strength rivet connections such as long nail tails, inability to ensure balance, unstable construction, etc., to save human resources and costs, Smooth construction and precise installation
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[0051] Example 1
[0052] 1. Preparation of rivets
[0053] (1) Preparation of nail head
[0054] The material selected for the preparation of the rivet in this embodiment is a cylindrical metal material 20MnTiB with a nominal diameter of 16mm;
[0055] Upsetting the cylindrical metal material 20MnTiB by warm heading to form a rivet blank with a nail head 1 and a shaft 2. The nail head 1 can be made into semi-circular, cylindrical, hexagonal heads and other shapes as needed;
[0056] In this embodiment, in addition to warm heading, cold heading can also be used to process and shape cylindrical metal materials;
[0057] (2) Quenching heat treatment
[0058] Place the rivet blanks in a continuous mesh belt quenching furnace, fill the mesh belt furnace with methanol cracked gas as a protective gas, and use an oxygen probe to keep the carbon potential of the methanol cracked gas consistent with the carbon content of the cylindrical metal material. Prevent oxidation and decarburization of riv...
Example Embodiment
[0097] Example 2
[0098] In the preparation process of rivets, except for the material selected in step (1) to prepare the nail head, the cylindrical metal material 40CrMnMo with a nominal diameter of 25mm; in step (2) quenching heat treatment, the heat treatment temperature is controlled at 750-950℃, and the holding time is In step (3) tempering heat treatment, the heat treatment temperature is controlled at 350-600℃, and the holding time is 1.5-3 hours; in step (5) cold rolling treatment, the length of the tail section is 30mm outside , The rest are the same as in Example 1;
[0099] In the preparation process of the riveting sleeve, except for step (1), the material selected in the preparation of the sleeve head is a cylindrical metal material of No. 20 steel, and the nominal diameter of the inner hole of the riveting sleeve 3 is greater than the nominal diameter of the locking groove 5 (25mm); step ( 3) The annealing heat treatment temperature is 550-780°C, and the holding ti...
Example Embodiment
[0101] Example 3
[0102] 1. Preparation of rivets
[0103] (1) Preparation of nail head
[0104] The material selected for preparing the rivets in this embodiment is an annealed Cr17Ni2 cylindrical metal material with a nominal diameter of 16mm;
[0105] Process the annealed Cr17Ni2 cylindrical metal material by warm heading to form a rivet blank with a nail head 1 and a shaft 2. The nail head 1 can be made into semi-circular, cylindrical, hexagonal heads and other shapes as needed;
[0106] In addition to warm upsetting in this embodiment, cold extrusion can also be used to process cylindrical metal materials;
[0107] (2) Quenching heat treatment
[0108] Place the rivet blanks in a mesh belt continuous quenching furnace or a box-type electric furnace, fill the furnace with air separated nitrogen as a protective gas, heat it to 1000°C, keep it warm for 2 hours, take out the rivet blanks and quickly oil-cool to room temperature;
[0109] The temperature of the quenching heat treatment in...
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