Cylinder liner and manufacturing method thereof

Abstract

The invention discloses a cylinder sleeve. The cylinder sleeve comprises an outer-layer metal tube and an inner-layer wear-resistant layer, wherein the inner-layer wear-resistant layer is formed in a manner that the outer-layer metal tube, of which the internal wall is coated with wear-resistant material powder, is sintered under a protective atmosphere. The invention further discloses a manufacturing method of the cylinder sleeve. The method comprises the following steps of: coating the wear-resistant material powder on the internal wall of the outer-layer metal tube; and sintering the outer-layer metal tube, of which the internal wall is coated with the wear-resistant material powder, under the protective atmosphere, thereby forming the inner-layer wear-resistant layer. According to the cylinder sleeve and the manufacturing method of the cylinder sleeve, the inner-layer wear-resistant layer is manufactured by adopting a sintering process, so that the manufacturing process is simple.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a cylinder liner and a manufacturing method thereof. Background technique [0002] As the core component of the mud pump in oil extraction, the cylinder liner is used to withstand mud wear and corrosion, and its service life directly affects oil recovery efficiency. [0003] There are two types of cylinder liners commonly used in China: bimetallic cylinder liners and ceramic cylinder liners. The structure of these two cylinder liners is composed of an outer metal tube and an inner wear-resistant tube made of wear-resistant material. The inner wear-resistant tube is made of wear-resistant alloy, which is a bimetallic cylinder liner. The grinding tube is made of wear-resistant ceramics and the ceramic cylinder liner. [0004] The existing cylinder liner manufacturing method is that the outer metal pipe and the inner wear-resistant pipe are processed and formed separately...

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Problems solved by technology

[0006] Among them, in the process of processing the outer metal tube and the inner wear-resistant tube separately, as well as the thermal assembly process, it needs to go through multiple mechanical processes and repeated heating. The manufacturing process is complicated, the energy consumption is large, and the cost is high.

[0007] In addition, during thermal assembly, to prevent severe deformation or cracks in the wear-resistant material layer, the thickness of the wear-resistant material layer must reach more than 4mm. The gap between the pistons gradually increases, and the mud starts to leak. When the inner surface of the cylinder liner wears to 0.5 mm, the mud pump will fail due to the serious mud leakage, and the cylinder liner will be scrapped. At this time, the effective utilization rate of wear-resistant materials Only 20%, serious waste

[0008] Moreover, because the outer metal tube and the inner wear-resistant tube of the existing cylinder liner are formed by interference fit and thermal assembly, the inner and outer tubes are prone to detachment during use, which greatly reduces the reliability of the cylinder liner product

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