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Production process of high-strength rivet nut

A rivet nut and production process technology, applied in the high-strength rivet nut process and fastener field, can solve the problem of insufficient strength of the rivet nut, and achieve the effects of high strength, preventing decarburization and improving strength

Pending Publication Date: 2021-08-20
ZHEJIANG FANGQUAN AUTOMOTIVE FASTENERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing rivet nut manufacturing process is generally annealed first and then tapped, so the rivet nut manufactured in this way has the defect of insufficient strength

Method used

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  • Production process of high-strength rivet nut

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] see figure 1 , a production process of a high-strength rivet nut of the present invention comprises the following steps:

[0023] a. Material selection: choose 20MnTiB as the blank material;

[0024] b. Drawing: The blank material is drawn by a drawing machine and transformed into a profile that meets the size requirements;

[0025] c. Cold heading: put the profile into the cold heading machine for cold heading to obtain the rivet nut;

[0026] d. Tapping: Put the rivet nut into the tapping machine for tapping;

[0027] e. Quenching: quench the formed rivet nuts in a heating furnace, control the quenching temperature to be 880°C, the heating time is 6 hours, the holding time is 1 hour, and then rapidly cooled in oil at 60°C;

[0028] f. Tempering: Temper the rivet nut after quenching, control the tempering temperature to 480 ℃, the heating time is 3 hours, and the holding time is 5 hours;

[0029] g. Surface treatment: Put the heat-treated rivet nut in an aqueous so...

Embodiment 2

[0033] see figure 1 , a production process of a high-strength rivet nut of the present invention comprises the following steps:

[0034] a. Material selection: choose 20MnTiB as the blank material;

[0035] b. Drawing: The blank material is drawn by a drawing machine and transformed into a profile that meets the size requirements;

[0036] c. Cold heading: put the profile into the cold heading machine for cold heading to obtain the rivet nut;

[0037] d. Tapping: Put the rivet nut into the tapping machine for tapping;

[0038] e. Quenching: Quenching the formed rivet nut in a heating furnace, controlling the quenching temperature to be 850°C, the heating time of 4 hours, the holding time of 0.5 hours, and then rapidly cooled in oil at 50°C;

[0039] f. Tempering: Temper the rivet nut after quenching, control the tempering temperature to 450 °C, the heating time is 2 hours, and the holding time is 3 hours;

[0040] g. Surface treatment: Put the heat-treated rivet nut in an ...

Embodiment 3

[0044] see figure 1 , a production process of a high-strength rivet nut of the present invention comprises the following steps:

[0045] a. Material selection: choose 20MnTiB as the blank material;

[0046] b. Drawing: The blank material is drawn by a drawing machine and transformed into a profile that meets the size requirements;

[0047] c. Cold heading: put the profile into the cold heading machine for cold heading to obtain the rivet nut;

[0048] d. Tapping: Put the rivet nut into the tapping machine for tapping;

[0049] e. Quenching: quench the formed rivet nut in a heating furnace, control the quenching temperature to be 910 °C, the heating time is 8 hours, the holding time is 1.5 hours, and then rapidly cooled in oil at 70 °C;

[0050] f. Tempering: Temper the rivet nut after quenching, control the tempering temperature to 510 °C, the heating time is 4 hours, and the holding time is 6 hours;

[0051] g. Surface treatment: Put the heat-treated rivet nut in an aqueo...

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Abstract

The invention discloses a production process of a high-strength rivet nut. The production process of the high-strength rivet nut comprises the following steps of a, selecting materials; b, conducting wire drawing; c, conducting cold heading; c, tapping; e, quenching, specifically, a formed rivet nut is quenched in a heating furnace, the quenching temperature is controlled to be 850 to 910 DEG C, the temperature rise time is 4 to 8 hours, the heat preservation time is 0.5 to 1.5 hours, then rapid cooling is conducted in a quenching medium, and the temperature of the quenching medium is 50 to 70 DEG C; f, tempering, specifically, the quenched rivet nut is tempered, the tempering temperature is controlled to be 450 to 510 DEG C, the heating time is 2 to 4 hours, and the heat preservation time is 3 to 6 hours; g, carrying out surface treatment; and h, carrying out optical full-inspection. According to the production process of the high-strength rivet nut provided by the invention, the rivet nut is firstly tapped and then is subjected to heat treatment, so that the prepared rivet nut has higher strength, and the requirement of people on high strength of the rivet nut is met.

Description

【Technical field】 [0001] The invention relates to the technical field of fasteners, in particular to the technical field of high-strength rivet nut technology. 【Background technique】 [0002] If the nut of a certain product needs to be installed outside, and the space inside is small, the indenter of the riveting machine cannot be entered for riveting and the methods such as budding cannot meet the strength requirements, then both riveting and riveting are not feasible. Riveting must be used. Rivet nuts are currently widely used in the assembly of electromechanical and light industrial products such as automobiles, aviation, instruments, furniture, and decoration. It is developed to solve the shortcomings of thin metal plate and thin tube welding nuts, such as easy melting and easy sliding of internal threads. The existing rivet nut manufacturing process is generally annealed first, and then tapped, and the rivet nut manufactured in this way has the defect of insufficient ...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 朱军方瑞海
Owner ZHEJIANG FANGQUAN AUTOMOTIVE FASTENERS
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