Laser overlaying method for engine valve conical surfaces

A technology of engine valve and laser surfacing welding, applied in the field of laser surfacing welding, which can solve the problems of low utilization rate of surfacing welding powder, increased heat input, high operating cost, etc., achieve stable characteristics, prevent pores from forming, and eliminate slag inclusions Effect

CN109570764AInactive Publication Date: 2019-04-05HUAI JI DENG YUE VALVE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-04-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a laser overlaying method for engine valve conical surfaces. Valve workpieces to be overlaid are formed through machining, and are preheated in a heat treatment furnace; the preheating temperature is 200-300 DEG C; the preheating time is 15-30 min; the valve workpieces to be overlaid are fixed by using a tool; the tool is mounted on a rotating shaft, and is used for drivingthe valve workpieces to be overlaid to rotate; the valve workpieces are overlaid by laser through a laser overlaying machine; due to self rotation of the valve workpieces, a scanning trajectory of laser beams emitted by the laser overlaying machine is spiral; and the laser overlaying machine comprises the following parameters: 5-8 mm of the light spot diameter, 2000-3000 W of the laser power, 5-15 mm / s of the scanning speed, 10-16 g / min of the powder feeding speed, 5-15 L / min of the flow of tail blowing gas, 5-10 L / min of the flow of protective gas, and 35-45% of the joint rate. The method not only can effectively reduce the loss of overlaying powder and increase the utilization rate of the overlaying powder, but also can effectively reduce thermal stress.
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Description

technical field

[0001] The invention relates to a laser surfacing method, in particular to a laser surfacing method for an engine valve conical surface. Background technique

[0002] With the ever-increasing performance requirements and environmental protection requirements, the working conditions of the engine are becoming more and more complex and harsh, and the working conditions of the valves are also becoming more severe, especially the working conditions of the exhaust valve. Because the valve moves in the engine cylinder, the working condition of the valve is more complicated. The main working conditions of the cone surface of the valve disc are as follows: (1) The valve disc is in a state of rapid opening and closing, so every time it is opened and closed, the cone surface of the valve will contact the valve seat ring, and due to the explosion pressure of the gas in the cylinder, the valve will The conical surface forms an impact with the seat ring. (2) The high te...

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Embodiment Construction

[0038] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "secon...