Abrasion-resistant and erosion-resistant ball valve spool and manufacturing method thereof
A manufacturing method and erosion-resistant technology, applied to valve devices, cocks including cutting devices, mechanical equipment, etc., can solve the problems of narrow material range, large welding residual stress and deformation, low thermal efficiency, etc., and achieve simple processing technology, Excellent mechanical properties and low equipment investment
Active Publication Date: 2019-03-22
EAST CHINA UNIV OF SCI & TECH +1
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- Abstract
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Problems solved by technology
The range of applicable materials for spray welding is narrow, the deformation of the base material is serious, and the composition of the spray welding layer is somewhat different from the original composition
The local high temperature in the surfacing process will lead to uneven heating and large temperature gradient, which will easily cause large welding residual stress and deformation, and the welding coating will crack locally or even form through cracks, resulting in coating peeling off
The coating thickness of thermal spraying is 0.2-0.6mm, the bonding force between the coating and the substrate is low, the porosity is high, the thermal efficiency is low, and the operating environment is poor
It can be seen that the traditional wear-resistant coating technology needs to be improved in order to prepare high-performance wear-resistant and erosion-resistant coating ball valve cores.
Method used
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[0036] The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the text of the description.
[0037] It should be understood that terms such as "having", "including" and "including" used herein do not equate the presence or addition of one or more other elements or combinations thereof.
[0038] Such as figure 1 with 3 As shown, in one embodiment, the wear-resistant and erosion-resistant ball valve core includes a metal body and a nickel-based tungsten carbide coating, wherein:
[0039] The metal body 4 has a plurality of zigzag grooves 41 spaced apart on its spherical outer surface, and a through hole for diversion is opened in the axial direction of the metal body. In this embodiment, the groove 41 has a square sawtooth wave structure. , It is understandable that the groove can be a sawtooth wave structure of other shapes, such as streamline, fish scale, etc., su...
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Abstract
The invention discloses a wear-resistant and washout-resistant ball valve core. The wear-resistant and washout-resistant ball valve core comprises a metal body and a nickel-based tungsten carbide coating, wherein a plurality of saw-toothed grooves are formed at an interval in the spherical outer surface of the metal body; the spherical outer surface of the metal body is uniformly coated with the nickel-based tungsten carbide coating; the thickness of the nickel-based tungsten carbide coating is 3mm to 6mm, wherein each groove is totally filled with the nickel-based tungsten carbide coating; the nickel-based tungsten carbide coating comprises 48.83wt% to 73.13wt% of tungsten carbide, 26.87wt% to 51.17wt% of nickel, 1.19wt% to 3.66wt% of chromium, 0.59wt% to 2.19wt% of boron, 0.91wt% to 2.56wt% of silicon and 0.59wt% to 2.19wt% of iron. According to the wear-resistant and washout-resistant ball valve core disclosed by the invention, tungsten carbide is flexibly arranged on the outer surface of a metal ball valve to form the nickel-based tungsten carbide coating by adopting a vacuum brazing process; subsequently a spherical ceramic mold is removed, and then a simple grinding process is performed to finally obtain the wear-resistant and washout-resistant ball valve core; the manufactured ball valve core is excellent in comprehensive performances such as wear resistance and washout resistance, thick in wear-resistant coating, convenient to machine and low in manufacturing cost.
Description
Technical field [0001] The invention relates to the technical field of valves. More specifically, the invention relates to a wear-resistant and erosion-resistant ball valve core and a manufacturing method thereof. Background technique [0002] The material of metal hard-seal ball valve is generally carbon steel or stainless steel. Due to the limitation of the material itself, the ball valve core often fails due to wear and erosion in the presence of strong wear and strong erosion. Using surface strengthening technology to modify the surface of the valve core and improve the erosion resistance of the valve core is an important method to improve the service life and reliability of the metal hard seal ball valve. [0003] However, traditional wear-resistant coating processes mainly include spray welding, surfacing welding, and thermal spray coating. The range of applicable materials for spray welding is narrow, the matrix material is severely deformed, and the composition of the spra...
Claims
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IPC IPC(8): F16K5/06F16K5/08C09D1/00C09D7/61C22C29/08C22C30/00C23C24/08
CPCC09D1/00C09D7/61C22C29/067C22C29/08C22C30/00C23C24/085F16K5/0605
Inventor 于新海王奕彤杨留张健焦伦龄涂善东王超方品田
Owner EAST CHINA UNIV OF SCI & TECH