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Long nut

A long nut and screw technology, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems affecting production, transportation and use, reducing the overall quality of equipment, and high material costs, achieving high plasticity and toughness, high Strength and stiffness, weight reduction effect

Inactive Publication Date: 2016-03-30
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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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 are impregnated with an organic carrier and sintered at 0.4MPa nitrogen pressure and 1730°C for 1h 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 3.5 MPa to obta...

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 1740°C for 2 hours under a nitrogen pressure of 0.5MPa 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 ...

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 belongs to the technical field of long nut machining, relates to a fastening piece, and particularly to a long nut. The long nut is composed of a screw cap and a screw rod; the screw cap is in a disc shape, and the outer diameter of the screw cap is greater than that of the screw rod; a circular concave hole arranged coaxially with the screw rod is formed in the middle of the screw cap and extends deeply to the screw rod, and the outer wall of the screw rod is provided with an external thread. The long nut is made of a three-dimensional network silicon nitride ceramic / alloy steel composite material. The three-layer layer-shaped porous silicon nitride ceramic / alloy steel composite material comprises, by volume, 30-50% of three-layer layer-shaped porous silicon nitride ceramic and 50-70% of alloy steel. The long nut is made of the three-layer layer-shaped porous silicon nitride ceramic / alloy steel composite material, and the three-layer layer-shaped porous SiC ceramic and the alloy steel are supporting frameworks to each other; the advantages of the SiC ceramic and the alloy steel are fully brought out, the high-temperature stability, abrasion resistance, corrosion resistance and the like of the long nut are improved effectively, and moreover the weight of the long nut is decreased.

Description

technical field [0001] The invention relates to a fastener, in particular to a long nut, and belongs to the technical field of long nut materials. Background technique [0002] Fasteners are also called standard parts in the market, which is a general term for a type 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, high temperature, acid-base environment,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B35/00C22C38/04C22C38/14C22C38/06C22C38/18C22C38/12C22C38/02
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18F16B35/00
Inventor 任鹏坤
Owner NINGBO JINPENG HIGH STRENGTH FASTENER
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