Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-strength bolt and its manufacturing method

A high-strength bolt and bolt technology, applied in the field of bolt processing, can solve the problems of plasticity and toughness that cannot reach high-strength bolts, and achieve the effect of improving service life, safe and reliable connection, and good quality.

Active Publication Date: 2017-12-22
JIANGSU YONGHAO HIGH STRENGTH BOLT
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this processing method can be used to produce high-strength bolts with strength and hardness reaching 12.9 and 14.9 grades, its plasticity and toughness still cannot meet the requirements of high-strength bolts.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-strength bolt and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Select the steel plate of Example 1 in Table 1 with chemical composition and mass percentage ratio, and the specific processing steps are as follows:

[0024] (1) Material preparation: Select the steel plate with the above composition to be pickled and derusted, and cut a cylindrical blank of appropriate size according to the specification of the bolt;

[0025] (2) Softening annealing; softening annealing is divided into two times, specifically: first softening annealing: the billet is subjected to isothermal softening annealing in a bell furnace, the softening annealing temperature is 750 ° C, the holding time is 7 hours, and its hardness is controlled at less than HB120, control methanol flow rate 25ml / min, gas flow rate 0.2Nm3 / h to prevent surface carburization; secondary softening annealing: annealing temperature is 650℃, time 5h, alcohol flow rate 20ml / min, gas flow rate 0.2Nm3 / h;

[0026] (3) Cold forging forming: cut the annealed cylindrical raw material to the r...

Embodiment 2

[0033] Select the steel plate of Example 2 in Table 1 with chemical composition and mass percentage ratio, and the specific processing steps are as follows:

[0034] (1) Material preparation: Select the steel plate with the above composition to be pickled and derusted, and cut a cylindrical blank of appropriate size according to the specification of the bolt;

[0035] (2) Softening annealing; softening annealing is divided into two times, specifically: first softening annealing: the billet is subjected to isothermal softening annealing in a bell furnace, the softening annealing temperature is 800 ° C, the holding time is 8 hours, and its hardness is controlled at less than HB120, control methanol flow rate 30ml / min, gas flow rate 0.25Nm3 / h to prevent surface carburization; secondary softening annealing: annealing temperature is 700℃, time 6h, alcohol flow rate 25ml / min, gas flow rate 0.25Nm3 / h;

[0036] (3) Cold forging forming: cut the annealed cylindrical raw material to the...

Embodiment 3

[0043] Select the steel plate of Example 3 in Table 1 with chemical composition and mass percentage ratio, and the specific processing steps are as follows:

[0044] (1) Material preparation: Select the steel plate with the above composition to be pickled and derusted, and cut a cylindrical blank of appropriate size according to the specification of the bolt;

[0045] (2) Softening annealing; softening annealing is divided into two times, specifically: first softening annealing: the billet is subjected to isothermal softening annealing in a bell furnace, the softening annealing temperature is 780 ° C, the holding time is 7.5 hours, and its hardness is controlled at less than HB120, control methanol flow rate 30ml / min, gas flow rate 0.22Nm3 / h to prevent surface carburization; secondary softening annealing: annealing temperature is 680°C, time 5.5h, alcohol flow rate 23ml / min, gas flow rate 0.22Nm3 / h ;

[0046] (3) Cold forging forming: cut the annealed cylindrical raw material...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a high-strength bolt, which is made of steel plates, and the parts by weight of the chemical components of the steel plates should meet the following requirements: C 0.32-0.45, Mn 0.55-0.74, V 0.07-0.12, Si 0.16-0.28, W 0.01~0.04, P≤0.025, S≤0.03, Ni 0.08~0.15, Sn 0.20~0.30, Cu 0.25~0.35, Al 0.12~0.35, B 0.002~0.004, Mo 0.3~0.5, Ti 0.003~0.01, Cr 0.08 ~0.13, Nb 0.01~0.015, Fe 90~100, the present invention also provides the manufacturing method of high-strength bolt, the high-strength bolt of the present invention has improved the overall strength of bolt, and bolt precision is high, and quality is good, has greatly improved its Tensile strength improves the service life of bolts, and is also resistant to wear and fatigue.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a high-strength bolt and a manufacturing method thereof. Background technique [0002] Bolt is a very widely used accessory, which is inseparable from aerospace to daily life. According to different strengths, bolts can be divided into ordinary bolts and high-strength bolts. Compared with ordinary bolts, high-strength bolts have many advantages: shorter on-site assembly time, less impact on production, long service life, wide range of applicable components, safe and reliable connections, and better manufacturability and economy. It is precisely because of these advantages of high-strength bolts that industrially developed countries have concentrated research on high-strength bolt steel and high-strength bolts in recent years, and developed a series of ultra-high-strength bolt steel and ultra-high-strength bolts. [0003] Chinese patent application (publication number: CN101890618A) re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C23F17/00
Inventor 朱汉华
Owner JIANGSU YONGHAO HIGH STRENGTH BOLT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com