T/CI 061-2022 Diesel exhaust valve stem high hardness wear-resistant coating spraying control technology guideline

Scope

Scope: This document specifies the production specifications and quality control requirements for the ultrasonic spray coating surface modification of the rod portion of diesel engine exhaust valves. This document can be used as a technical basis for key processes such as materials, fuels, and powders during the ultrasonic spray coating production of the rod portion of diesel engine exhaust valves. Main technical content: Technical requirements for the control of high-hardness wear-resistant coatings sprayed on the rod portion of diesel engine exhaust valves. These requirements are written based on the rod portion as the model, and the spraying area is specified in the design drawings. The coating on other parts can be adjusted according to the design drawings. 4.1 Spraying equipment: Ultrasonic flame spraying system, sandblasting system, spraying industrial robots, clamping and moving stations, sandblasting and spraying rooms, dust removal systems, fan systems, chillers, fuel supply systems, gas supply systems, external dry air compressors, and central control panels. According to the processed products, a work turntable is installed, and the valve rods and rotating parts can be sprayed using a multi-station turntable. 4.1.1 Coating processing flow: Cleaning - Protection - Preheating and sandblasting - Spraying - Inspection 4.2 Preparation of spraying areas and processing dimensions of spraying areas: The spraying surface and the surface extending 50mm outward shall meet the processing requirements of the product drawings. Residual features such as oxide scale and rust spots on the spraying surface shall not exist. 4.2.1 Cleaning: Clean the surface of the spraying area to remove residual oxide scale, oil stains, dust, and water stains, as these will affect the bonding strength of the coating. Therefore, industrial alcohol is used to clean the spraying area to ensure that the spraying surface is clean. After cleaning, the spraying surface shall not be touched with g

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