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A kind of screw and its preparation method

A screw and tungsten carbide technology, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the problems of screw corrosion or wear, tungsten carbide coating peeling off, etc., and achieve excellent wear resistance and excellent comprehensive machinery performance effect

Active Publication Date: 2018-10-09
KUNSHAN SERGEANT EQUIP IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Plastics decomposed by high-temperature and highly corrosive gases, high-fiber plastics, and high-precision molding plastics are extruded or injected, and the corrosion and wear of the screw are quite serious. The screw manufactured by the above method is difficult to meet the molding processing requirements of these plastics. , causing the screw to be corroded or worn quickly, or the tungsten carbide coating to fall off early, forcing the extruder and injection molding machine to stop production and replace the screw

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  • A kind of screw and its preparation method

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preparation example Construction

[0018] The preparation method of the above-mentioned screw is as follows: the medium-carbon alloy steel is turned and milled into a screw blank, and the surface of the screw blank is uniformly sprayed with a metal-based tungsten carbide alloy with a thickness of 0.5 to 2.0mm by using supersonic flame spraying or plasma supersonic spraying technology. Coating, hot pressing and sintering of the sprayed screw, grinding and polishing into finished screw.

[0019] The metal-based tungsten carbide alloy used in supersonic flame spraying is NiMoCrFeCo-WC alloy powder, wherein the mass content of tungsten carbide is 30-80%.

[0020] Among them, the mass composition of NiMoCrFeCo is: 15.0-28.0% Cr, 1.2-11.5% Fe, 10.5-22.0% Mo, 0.05-6.9% Co, 0.0-0.02% C, 0.0-0.06% Mn, 0.0-0.09% of Si, 0.0-0.05% of Al, 2.0-9.0% of W, 0.0-1.0% of V and the rest of Ni.

[0021] The supersonic flame spraying or plasma supersonic spraying part is the entire screw outer surface, or the partial working outer ...

Embodiment 1

[0027] According to the screw manufacturing method of steel base core material + supersonic flame spraying metal base tungsten carbide coating + hot pressing sintering. The material of the steel core is 42CrMoA. According to the mass percentage, its alloy composition is 0.38-0.45% of C, 0.17-0.37% of Si, 0.50-0.80% of Mn, 0.90-1.20% of Cr, 0.15-0.25% of Mo and other Amount of Fe. Supersonic spraying NiMoCrFeCo-WC coating, wherein the mass content of WC is 50%, according to the mass percentage, the mass composition of the binder phase of NiMoCrFeCo-WC alloy powder is: 15.0-28.0% Cr, 1.2-11.5% Fe, 10.5 ~22.0% Mo, 0.05~6.9% Co, 0.0~0.02% C, 0.0~0.06% Mn, 0.0~0.09% Si, 0.0~0.05% Al, 2.0~9.0% W, 0.0~ 1.0% of V and the balance of Ni. The supersonic spraying fuel is aviation kerosene, and the supporting gas is oxygen. The spraying process parameters are: fuel pressure 0.80-1.50MPa, flow rate 21L / h, oxygen pressure 1.70MPa, flow rate 45m 3 / h, the powder feeding flow rate is 10.50k...

Embodiment 2

[0029] According to the screw manufacturing process of steel base core material + supersonic flame spraying metal base tungsten carbide coating + hot pressing sintering. The steel core material is H13. According to the mass percentage, its alloy composition is 0.32-0.45% C, 0.80-1.20% Si, 0.20-0.50% Mn, 4.75-5.50% Cr, 1.10-1.75% Mo, 0.80 ~1.20% V and balance Fe.

[0030] Supersonic spraying of NiMoCrFeCo-WC coating, wherein the mass content of WC is 69%, according to the mass percentage, the mass composition of the binder phase of NiMoCrFeCo-WC alloy powder is: 15.0-28.0% Cr, 1.2-11.5% Fe, 10.5 ~22.0% Mo, 0.05~6.9% Co, 0.0~0.02% C, 0.0~0.06% Mn, 0.0~0.09% Si, 0.0~0.05% Al, 2.0~9.0% W, 0.0~ 1.0% V and Ni in the balance; the fuel for supersonic spraying is aviation kerosene, the auxiliary gas is oxygen, and the spraying process parameters are: fuel pressure 1.45MPa, flow rate 20L / h, oxygen pressure 1.60MPa, flow rate 40m 3 / h, the powder feeding flow rate is 10.00kg / h, the pow...

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Abstract

The invention provides a threaded rod and a preparing method thereof. The threaded rod comprises a steel-base threaded rod body. The threaded rod body is coated with a metal-base carbon tungsten alloy coating with the thickness ranging from 0.5 mm to 2.0 mm, the metal-base carbon tungsten alloy and the steel-base threaded rod body are metallurgical bonding, and the bonding strength of the metal-base carbon tungsten alloy and the steel-base threaded rod body is larger than 100 Mpa. The preparing method comprises the steps that medium-carbon alloy steel is subjected to turning and milling and machined into a threaded rod blank, the metal-base carbon tungsten alloy coating with the thickness ranging from 0.5 mm to 2.0 mm is evenly sprayed to the surface of the threaded rod blank through a high velocity oxy-fuel technology, and the sprayed threaded rod is subjected to hot pressing sintering and is machined into the finished product threaded rod through grinding and polishing. According to the threaded rod and the preparing method thereof, the design idea that a mechanical part is made of two kinds of materials is achieved, the steel-base core material has excellent comprehensive mechanical performance, and the metal-base tungsten carbide surface layer has especially excellent abrasion resistant and corrosion resistant performance which is a characteristic cannot be achieved by any single material.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology and application of high-performance basic parts, specifically relates to supersonic flame spraying, heating and pressing sintering technology, and is mainly used for high wear-resistant and high corrosion-resistant injection molding machines, extruder screw manufacturing and the like. Background technique [0002] The screw is the most critical part of the injection molding machine and extruder. The traditional screw manufacturing methods include 38CrMoAl nitriding treatment, medium carbon steel or medium carbon alloy steel boronizing treatment, powder high-speed steel overall manufacturing, medium carbon steel quenching and tempering plus screw tooth spraying Manufacturing methods such as welding strengthening treatment, Chinese patent CN200971903Y invented subsonic spraying Co12-WC screw on 38CrMoAl, and CN200946617Y invented subsonic spraying Ni60-WC screw on 38CrMoAl. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15C23C4/06C22C29/08C22C30/00C22C32/00C22C19/05B29C47/60B29C45/60
CPCB22F3/15B29C45/60B29C48/505C22C19/055C22C19/056C22C29/08C22C30/00C22C32/0052C23C4/06
Inventor 沈承金闫士良陶庆陈正姚叶
Owner KUNSHAN SERGEANT EQUIP IND