Molding method of hard sealing layer on inner surface of annular part for pump body

Abstract

The invention relates to a method for forming a hard sealing layer on the inner surface of an annular component for a pump body, which is characterized in that the side-axis powder feeding method is adopted, and the inclination angle of the laser lens is adjusted so that the irradiation position of the laser beam is at an azimuth angle of 120° on the inner wall of the annular component. Degree to 180 degrees to determine the starting point of processing; then adjust the focal length of the focusing lens, and adjust the position of the powder feeding tube, so that the extension line of the powder feeding tube and the laser beam meet at the same position on the workpiece surface, and then adjust the carrier gas volume, Make the powder sent by the powder feeder enter the intersection point in a straight line. After closing the powder feeder, program the laser beam on the surface of the annular component with an equidistant spiral trajectory, and finally turn on the laser and the powder feeder, according to the determined trajectory. Laser cladding is performed on the inner surface of the ring-shaped part for the pump body to form a hard sealing layer on the inner surface of the ring-shaped part for the pump body. This method can also accurately deliver the powder to the position of the molten pool at the depth of the inner surface of the annular part of the pump, replacing the special coaxial powder feeding head, and effectively reducing the processing cost.

Description

technical field [0001] The invention relates to a method for forming a hard sealing layer on the inner surface of an annular component for a pump body, in particular to a side-axis powder feeding method for forming the hard sealing layer on the inner surface of the annular component of a pump body by using laser powder. technical background [0002] The pump and valve industry is an important part of the equipment manufacturing industry. Due to the complex working conditions of the valve, it is often necessary to prepare some modified layers with special properties on its surface, such as high temperature heat resistance, wear resistance, corrosion resistance coating, etc. At present, the techniques for improving the surface performance of pump valves mainly include thermal spraying, surfacing, brazing and cold spraying, etc. Their disadvantages are that they are easy to crack, and thermal spraying and brazing techniques are also easy to cause the modified layer to fall off....

AI Technical Summary

Problems solved by technology

In practical application, the side-axis powder feeding adopts the self-weight powder feeding method. The powder comes out of the powder feeder in the form of carrier gas, and the carrier gas is completely unloaded through the gas unloading device. The self-weight method of powder feeding requires that the angle of the powder feeding pipe be as vertical as possible to the ground to ensure that the powder can be accurately fed into the molten pool under the action of gravity when the powder feeding head is as far as possible from the surface of the workpiece. In the processing of ring parts, due to the limitation of the inner surface of pump ring parts, it is impossible for the powder feeding pipe to be perpendicular to the workpiece. In order to go deep into the workpiece for laser cladding, the angle between the powder feeding head and the vertical line is often If it is greater than 45 degrees, the powder sent by the powder feeding head will be sent out in a parabola under the action of gravity. When there is a certain distance between the powder feeding head and the light spot, the powder cannot be accurately delivered to the position of the molten pool

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