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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

Inactive Publication Date: 2012-02-08
彭亮生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rivets and rivet sleeves of this invention all use stainless steel as raw materials, which are expensive and costly
In addition, the prepared high-strength rivet connection pair has a long nail tail, which wastes steel. The rivet connection pair has no locking device during installation, which cannot ensure the balance under the installation conditions and the construction is unstable.

Method used

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  • Bobtail high-strength rivet connection pair and manufacturing method thereof
  • Bobtail high-strength rivet connection pair and manufacturing method thereof
  • Bobtail high-strength rivet connection pair and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Preparation of rivets

[0053] (1) Preparation of nail heads

[0054] The material selected for the preparation of the rivet in this embodiment is a cylindrical metal material 20MnTiB, and its nominal diameter is 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, and the nail head 1 can be made into a semicircular head, a cylindrical head, a hexagonal head, etc. as required;

[0056] In this embodiment, in addition to warm heading, the cylindrical metal material can also be processed and formed by cold heading;

[0057] (2) Quenching heat treatment

[0058] Place the rivet blank in a continuous mesh belt quenching furnace, fill the mesh belt furnace with methanol cracking gas as a protective gas, use an oxygen probe to keep the carbon potential of the methanol cracking gas consistent with the carbon content of the cylindrical metal material, and Prevent oxidation, decarburization,...

Embodiment 2

[0098] In the preparation process of the rivet, except that the material selected in the step (1) to prepare the nail head is a cylindrical metal material 40CrMnMo, its nominal diameter is 25mm; the heat treatment temperature in the step (2) quenching heat treatment is controlled at 750-950 ° C, and the holding time 1.5-3 hours; step (3) the temperature of heat treatment in the tempering heat treatment is controlled at 350-600 ℃, and the holding time is 1.5-3 hours; , all the other are identical with embodiment 1;

[0099] In the preparation process of the rivet sleeve, except that the material selected in step (1) to prepare the sleeve head is No. 20 steel of cylindrical metal material, the nominal diameter of the rivet sleeve 3 inner holes is greater than the nominal diameter (25mm) of the locking groove 5; the step ( 3) the temperature of annealing heat treatment is 550-780 ℃, and the soaking time is 1.5-3 hours, all the other are identical with embodiment 1;

[0100] Afte...

Embodiment 3

[0102] 1. Preparation of rivets

[0103] (1) Preparation of nail heads

[0104] The material selected for the preparation of the rivet in this embodiment is a cylindrical metal material annealed Cr17Ni2, and its nominal diameter is 16mm;

[0105] Process the annealed Cr17Ni2 cylindrical metal material through warm heading to form a rivet blank with a nail head 1 and a shaft 2, and the nail head 1 can be made into a semicircular head, cylindrical head, hexagonal head, etc. according to needs;

[0106] In this embodiment, in addition to warm heading, the cylindrical metal material can also be processed by cold extrusion;

[0107] (2) Quenching heat treatment

[0108] Place the rivet blank 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, and keep it warm for 2 hours, then take out the rivet blank and quickly oil-cool it to room temperature;

[0109] In this embodimen...

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Abstract

The invention discloses a bobtail high-strength rivet connection pair and a manufacturing method thereof. The manufacturing method comprises the following steps of: forming a rivet blank provided with a nail head and a rod body through processing a cylindrical metal material; subsequently, carrying out quenching and tempering heat treatment on the rivet blank; carrying out finish turning or grinding processing on the rod body, thus the rod body is subjected to diameter reduction to form a rod body with a middle diameter for manufacturing a locking groove and a pull trough; carrying out cold rolling depression treatment on the rod body with a middle diameter so as to manufacture the locking groove provided with discontinuous annular grooves and the pull trough; providing a rupture groove between the locking groove and the pull trough so as to obtain the rivet; processing the cylindrical metal material so as to form a riveting sleeve blank provided with a sleeve head and a sleeve body; and then carrying out heat treatment so as to obtain a riveting sleeve. The prepared rivet and the riveting sleeve have excellent comprehensive mechanical property, and meet the international standard ISO 898.18.8 level requirement; and the construction work performance (clamping force, pulling-out force and shearing force) of the rivet connection pair meets the requirement of United States Standard US, MIL, P-23469. In addition, the manufacturing method provided by the invention has the advantages of simple process and low cost, and is convenient for customers.

Description

technical field [0001] The invention relates to a manufacturing method of fastener products for machinery and railways, in particular to a manufacturing method of a non-detachable short tail high-strength rivet connection pair. Background technique [0002] For a long time, ordinary rivets with hot riveting have been widely used in steel structures such as railways, trucks, and bridges, which have low connection strength and high maintenance costs in the later period, and are gradually replaced by bolted joints. The bolted connection pair has high strength, controllable clamping force and pull-off force, and its application range is expanding day by day. However, it adopts threaded connection and its self-locking performance is poor. Especially in the 1940s during the Second World War, the aircraft carrier deck fastening The strength bolts become loose when the plane lands, which becomes a hidden danger and attracts attention. Although the high-strength bolt connection pair...

Claims

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Application Information

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IPC IPC(8): F16B19/04C21D9/00C21D1/18
Inventor 彭亮生
Owner 彭亮生
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