extruded aluminum pcb enclosure

　　What are the surface treatment methods for CNC machined parts?

　　Numerical control machining of parts is a technique that uses computer digital control for strict machining, with a wide range of machining limitations. CNC machining parts occasionally undergo surface treatment in response to the environment, so let's take a look at the surface treatment techniques for CNC machining parts below?

　　1、 Manual disposal: such as scraper, wire brush or grinding wheel. The rust spots and oxide scale on the surface of the workpiece can be removed by hand, but manual disposal is labor-intensive, has low production compliance, poor quality, and incomplete washing.

　　2、 Chemical treatment: The main purpose is to react with an acidic or alkaline solution with the oxide and oil on the surface of the workpiece, and then dissolve in the acidic or alkaline solution to remove the oxide and oil on the surface of the workpiece. Then rinse with nylon cloth and stainless steel wire brush.

　　3、 Machine disposal: including wire brush roller polishing and shot blasting.

　　1. Polishing technique is that the brush roller is driven by a motor, and the brush roller twists at high speed on the high and low surfaces of the belt in the opposite direction of the rolling action. The washed iron oxide flakes are washed away by the closed cycle cooling water flushing system. Shot blasting is a technique of using centrifugal force to accelerate projectiles and radiate them into workpieces to remove rust.

　　2. Shot blasting punishment is divided into shot blasting punishment and sandblasting punishment. The surface treatment of shot peening has a significant impact, and the flushing effect is obvious. However, shot peening can easily cause deformation of thin plate workpieces, while steel shot peening can affect the surface of the workpiece and cause deformation of the metal substrate. Since Fe304 and FE203 are not plastics, they will peel off due to fragmentation, and the oil film will deform with the workpiece. Shot blasting cannot completely remove the oil stains from the workpiece.

　　1、 Benchmark first. First, process the reference surface. During the machining process of the parts, the appearance that serves as the positioning reference must be processed first to provide the reference for subsequent processes as soon as possible.

　　2、 Separate processing stages. The appearance with high precision machining quality requirements is divided into three stages: rough machining, semi precision machining, and precision machining. The key is to ensure the quality of the processing, which is beneficial for the scientific use of equipment in the placement of heat treatment processes and the discovery of defects in raw materials.

　　3、 Face first, hole later. The components such as the box, bracket, and connecting rod should be machined flat first, and then drilled. In this way, the machining of holes can be facilitated by plane positioning, ensuring the accuracy of the position of the plane and the hole, and facilitating the machining of flat faces.

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