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Machining method for long nut

A processing method and long nut technology, applied in the direction of nuts, manufacturing tools, threaded fasteners, etc., can solve the problems that affect production, transportation and use, reduce the overall quality of equipment, and high cost of materials, so as to achieve high plasticity and toughness, High strength and hardness, weight reduction effect

Inactive Publication Date: 2016-03-23
NINGBO JINPENG HIGH STRENGTH FASTENER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The nuts in the prior art generally adopt an integral metal structure, which is not only heavy in weight, high in material cost, but also in general performance. As a connecting fastener for equipment, it occupies a relatively large weight in the equipment, which is not conducive to reducing the overall quality of the equipment. Affect all aspects of production, transportation and use

Method used

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  • Machining method for long nut

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of three-layer layered porous SiC ceramic / alloy steel composites:

[0040] According to the raw material ingredients described in upper surface layer, intermediate layer and lower surface layer respectively (the raw material composition of upper surface layer and lower surface layer silicon nitride ceramics is 94% Si 3 N 4 and 6%Y 2 o 3 , The raw material composition of the intermediate layer silicon nitride ceramics is 3% SiO 2 (particle size 0.1-0.5μm), 1% carbon black (particle size 60-80nm), 7% Y 2 o 3 (particle size is 0.2-1.2μm), balance Si 3 N 4 (α>95%)), the ingredients were impregnated with an organic carrier and sintered at 1730° C. for 1 hour under a nitrogen pressure of 0.4 MPa to obtain dry powders of the upper surface layer, the middle layer, and the lower surface layer;

[0041] The dry powders of the upper surface layer, the middle layer and the lower surface layer are deposited in sequence, and finally press-molded under a pressure of...

Embodiment 2

[0048] Preparation of three-layer layered porous SiC ceramic / alloy steel composites:

[0049] According to the raw material ingredients described in upper surface layer, intermediate layer and lower surface layer respectively (the raw material composition of upper surface layer and lower surface layer silicon nitride ceramics is 92% Si 3 N 4 and 8%Y 2 o 3 , The raw material composition of the intermediate layer silicon nitride ceramics is 4% SiO 2 (particle size 0.1-0.5μm), 1.5% carbon black (particle size 60-80nm), 5% Y 2 o 3 (particle size is 0.2-1.2μm), balance Si 3 N 4 (α>95%)), the ingredients were impregnated with an organic carrier and sintered at 0.5 MPa nitrogen pressure and 1740°C for 2 hours to obtain dry powders of the upper surface layer, the middle layer, and the lower surface layer;

[0050] The dry powders of the upper surface layer, the middle layer and the lower surface layer are deposited in sequence, and finally press-molded under a pressure of 3 MPa...

Embodiment 3

[0057] Preparation of three-layer layered porous SiC ceramic / alloy steel composites:

[0058] According to the raw material ingredients described in upper surface layer, intermediate layer and lower surface layer respectively (the raw material composition of upper surface layer and lower surface layer silicon nitride ceramics is 95% Si 3 N 4 and 5%Y 2 o 3 , The raw material composition of the intermediate layer silicon nitride ceramics is 2% SiO 2 (particle size 0.1-0.5μm), 1% carbon black (particle size 60-80nm), 8% Y 2 o 3 (particle size is 0.2-1.2μm), balance Si 3 N 4 (α>95%)), the ingredients were impregnated with an organic carrier and sintered at 0.4MPa nitrogen pressure and 1735°C for 2h to obtain dry powders of the upper surface layer, the middle layer, and the lower surface layer;

[0059] Lay the dry powder of the prepared upper surface layer, middle layer and lower surface layer in sequence, and finally press molding under a pressure of 4MPa to obtain a three...

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Abstract

The invention relates to a machining method for fasteners, in particular to a machining method for a long nut, and belongs to the technical field of long nut machining. The machining method comprises the steps that three-layer layered porous silicon carbide ceramics / alloy steel combined materials are subjected to normalization firstly and then are machined to be a long nut blank, and finally the long nut blank is subjected to heat treatment to form the long nut. The heat treatment comprises carburizing treatment and tempering treatment. The three-layer layered porous silicon carbide ceramics / alloy steel combined materials comprise 30-50% of three-layer layered porous silicon carbide ceramics and 50-70% of alloy steel by volume percent. The long nut is prepared from the three-layer layered porous silicon carbide ceramics / alloy steel combined materials, the three-layer layered porous silicon carbide ceramics and the alloy steel are supporting frameworks for each other, the strength, hardness, toughness, corrosion resistance and abrasion resistance of the long nut are improved through annealing treatment and carburizing treatment, the machining performance of the long nut is improved, and the long nut is easy to weld.

Description

technical field [0001] The invention relates to a processing method for fasteners, in particular to a processing method for long nuts, and belongs to the technical field of long nut processing. Background technique [0002] Fasteners, also known as standard parts in the market, is a general term for a class of mechanical parts used when two or more parts (or components) are fastened and connected into a whole. It is characterized by a wide variety of specifications, different performances and uses, and a high degree of standardization, serialization, and generalization. Fasteners are the most widely used mechanical basic parts and are in great demand. Commonly used fasteners include bolts, screws, nuts, etc. [0003] A nut is a nut, which is self-locked by the friction between the nut and the bolt, but the reliability of this self-lock will be reduced under dynamic load. When the nut is in use, the environment varies greatly, and it is possible to be in a low temperature,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/28C21D1/18C23C8/00C22C38/32C22C38/04C22C38/14C22C38/06C22C38/18C22C38/12F16B37/00C04B35/584
Inventor 任鹏坤
Owner NINGBO JINPENG HIGH STRENGTH FASTENER
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