Do you remember these six points of precision metal parts processing?

u200bIn the processing of precision metal parts, hardware processing accounts for a large part. This time I will share with you what are the technological properties of hardware, I hope it will be helpful to everyone! u200bCasting performance: Refers to some process properties of whether a metal or alloy is suitable for casting, mainly including flow properties, ability to fill the mold; shrinkage, the ability to shrink the volume when the casting is solidified; segregation refers to the unevenness of chemical composition. Welding performance: refers to the characteristics of metal materials that are welded together by two or more metal materials through heating or heating and pressure welding, and the interface can meet the purpose of use. Top gas section performance: refers to the performance that metal materials can bear upsetting without breaking. Cold bending performance: refers to the performance of metal materials that can withstand bending without breaking at room temperature. The degree of bending is generally expressed by the ratio of the bending angle α (external angle) or the bending center diameter d to the material thickness a. The larger a or the smaller d/a, the better the cold bendability of the material. Stamping performance: the ability of metal materials to withstand stamping deformation without breaking. Stamping at room temperature is called cold stamping. The inspection method is tested by cupping test. Forging performance: the ability of metal materials to withstand plastic deformation without breaking during forging. The processing is divided into the following four stages: 1. Surface first, hole second. For parts such as box body, bracket and connecting rod, the plane should be processed first and then the hole should be processed. In this way, the holes can be positioned on the plane to ensure the position accuracy of the plane and the holes, and it is convenient to process the holes on the plane. 2. Machining the reference surface first. During the machining process, the surface as the positioning reference should be processed first, so as to provide a precise reference for the subsequent processing as soon as possible. Called 'benchmark first.' 3. Finishing processing of the main surface (such as grinding, honing, fine grinding/rolling processing, etc.) should be carried out at the later stage of the process route. The surface finish after processing is above Ra0.9um, and slight collisions will cause damage. Damage to the surface. In Japan, Germany and other countries, after the finishing process, you must use flannel to protect it. Never touch the workpiece directly with your hands or other objects, so as to avoid the finishing surface due to the transfer and installation between the processes. Be injured. 4. Dividing the processing stages Surfaces with high processing quality requirements are divided into processing stages, which can generally be divided into three stages: rough machining, semi-finishing and finishing. Mainly to ensure the processing quality; facilitate the rational use of equipment; facilitate the arrangement of the heat treatment process; and facilitate the discovery of blank defects.u200b