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Direct-current argon arc plasma powder spray gun and manufacturing method

A plasma and argon arc technology, applied in the direction of fusion spraying, metal material coating process, coating, etc., can solve the problem that the conveying mechanism cannot ensure continuity, it is difficult to ensure uniform heating of all particles, and it is difficult to ensure stable droplet quality and temperature and other issues, to achieve the effect of improving the quality stability of the coating, improving the stability, and expanding the technical application field

Active Publication Date: 2016-07-13
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that all metal powders cannot pass through the high temperature zone in the center of the flame, and it is difficult to ensure that all particles are heated evenly in the flame by adopting the radial powder feeding mode inside the flame or outside the flame after the focus point of the plasma arc is adopted in the prior art. At the same time, approximately the same speed of movement and the delivery mechanism of the powder cannot be guaranteed to be continuous and quantitative (g / min) to send the powder into the negative pressure zone in the center of the flame, so it is difficult to ensure that the quality of the droplets in the mist spray cone is stable and temperature stability issues

Method used

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  • Direct-current argon arc plasma powder spray gun and manufacturing method

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Embodiment

[0068] Now design and manufacture a water-cooled powder spray gun with 40KW (65V, 600A) and powder spraying speed of 40-60g / min.

[0069] The nickel-based alloy powder used has a specific gravity d=2.6g / cm 3 , the working gas is high-purity argon.

[0070] It should be done as follows:

[0071] 1 Hollow tungsten cathode system design

[0072] 1.1 Parameter Design of Hollow Helical Spring

[0073] a: Assume that the outer diameter of the hollow coil spring is D=4mm, and the spring is wound with a spring steel wire with a diameter of Φ=0.5mm. The spacing h=4mm between the spring wires is calculated according to the formula (1) dw=K / 4 D2 h d v, where: K=1, D=0.4cm, h=0.4cm, d( Powder bulk specific gravity) = 2.6g / cm 3 , then dw=0.05026·2.6·v=0.13069·v

[0074] b: The speed of the speed-regulating motor is set to v=500r / min, then dw=65.34g / min, which meets the requirements, so the speed-regulating motor is selected as a speed of 0-1500r / min and a power of 500 watts.

[0075...

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Abstract

The invention discloses a direct-current argon arc plasma powder spray gun and a manufacturing method and belongs to the field of flame spraying equipment and technology of metal powder and metal ceramic powder.Two novel technologies including a hollow tungsten cathode outer surface annular arcing direct-current plasma heating method and an axial powder feeding mechanism penetrating the core of an argon arc are adopted, and position matching of a negative voltage pressure of the electric arc and the powder feeding mechanism is utilized, so that stability of the spray gun during long-time working is improved, and uniformity in heating temperature of metal powder particles, uniformity in spray speed and stability of spray layer quality are guaranteed.In addition, due to structural changing of a gun body, technology application field of the gun is expanded obviously, and the gun is expected to make a beneficial contribution to development of high technology in the future.

Description

technical field [0001] The invention belongs to the flame spraying equipment and technical field of metal powder and cermet powder, and provides a new-type direct current argon arc plasma powder spray gun, which can ensure the quality and process of metal powder and cermet powder flame spraying coating with high quality. stability. The technical application field of DC argon arc plasma powder spray gun has been expanded. technical background [0002] The literature search in the past 40 years shows that the core problem of the metal powder flame spray gun is the structure and technical parameter control of the flame spray gun. The entire history of the development of metal powder spraying technology is actually the development history of the flame spray gun. The early flame spray gun was developed from the oxygen-acetylene gas welding torch. The high-temperature flame of this spray gun is a high-temperature gas flame formed after the combustion of a certain pressure of oxyg...

Claims

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Application Information

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IPC IPC(8): C23C4/129
Inventor 郭志猛吴成义赵放郝俊杰龙海明舒进锋唐明祥吴庆华吴立成王海英袁蛟蛟
Owner UNIV OF SCI & TECH BEIJING
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