Measures to Improve Surface Processing Quality of Aluminum Alloy Plate Parts

At present, SUPER9 is widely used by domestic roll indium manufacturers

Many parts of the PASSIM PROTOS70 high-speed coiling unit are made of lead alloys such as LF5LVIILY2, and the majority of plates are processed by general enterprises on the gantry planer. The surface quality and process requirements of such parts are roughness Ra3.2Ra1.6 , Most of the flatness is within 0,02/1000. The surface of the parts processed by conventional methods can not meet the requirements of drawings and processes. This has always been one of the same problems as our factory's machining vehicles, which seriously affects product quality and work efficiency.

1 The reason for affecting the surface processing quality of aluminum alloy plate parts is that the aluminum alloy material has high plasticity and is annealed before processing. The machinability is poor. The gantry planer can only use medium and low speed cutting, which is prone to cutting tumors. Cutting tumors and vibrations on the bottom surface of the workpiece can cause overcutting and cause longitudinal groove defects; the chips will adhere to the processed surface to form burrs or be flattened by the tool to form a hard spot after the chip is peeled off, resulting in a rough surface Increase by 1~2 grades; due to low cutting angle and small tool rake angle, the metal on the processed surface has become brittle after severe smoked plastic deformation, and it breaks before the cutting edge is separated from the chips, and the metal under the crack remains on the processed surface Formation of fish scale-like burrs (ie scale burrs); or the squeezing effect of the cutting tumor on the cutting layer to form scale burrs, which increases the roughness of the processed surface by 24 levels, at this time, serious longitudinal furrows may occur, even leading to workpieces Report.

2 Measures taken In view of the above problems and causes, we have taken measures to improve the tool, determine a reasonable amount of cutting, select a cutting fluid with good lubrication performance, and perform wide knife precision planing.

2.1 Wide blade machining uses waV high-connect tool steel to make the blade, the main rake angle of the tool is 7n=25, the main rake angle is ∞=10°; the roughness of the rake face and the rake face is Ra0.4, and the arc is minimized at the cutting edge. In order to ensure the sharp edge of the knife and cut lightly. During use, please note that the width of the white blade on the flank face is less than 0.3m, otherwise it should be sharpened in time. The arbor adopts a spring blade to further eliminate the impact of vibration during the processing. 2.2 Selection of cutting amount Selection of cutting amount avoids the medium-speed processing area. Use low speed to work, reduce the cutting depth and reduce the cutting resistance; choose a large feed to ensure the improvement of working efficiency. The specific parameters are as follows: cutting speed ν=5~

8 Sm/min, cutting depth T=0.02~0.05mm: feed amount g=10~

12n stroke,

2.3 Selection of cutting fluids For machining operations such as milling and gear making in machinery manufacturing enterprises, ferrous metal rust prevention problems usually use diesel as the cutting fluid, but the lubricity of diesel is poor.

We use extreme pressure saponification liquid to improve the lubrication performance during cutting