For precision parts machining, not all materials can be precision machined. Certain materials that are too hard for the machined part may damage the part. Therefore, unless these materials are made of special materials for machine parts or laser cutting, they are not suitable for precision machining. 

For precision parts processing materials are divided into two main categories, metallic materials, non-metallic materials. 

Generally speaking for metal materials, the hardness is the largest for stainless steel, followed by cast iron, followed by copper, and finally aluminium, while the processing of ceramics, plastics, etc. is the processing of non-metallic materials. 

First of all, the hardness of the material is a requirement. If the material is harder than the machine, it is impossible to process it. 2.

2. Secondly, the material should be moderately hard or soft, at least a notch lower than the hardness of the machine part. At the same time also depends on the role of the processing device is to do with what, the machine parts reasonable selection of materials.  

In short, precision machining requirements for materials or some, not what material is suitable for processing. For example, too soft or too hard material, the former is not necessary to process, while the latter is not machinable. 

Therefore, the most basic rule is to pay attention to the density of the material before processing. If the density is too high, it is equivalent to a high hardness, and if the hardness exceeds the hardness of the machine part (lathe turning tool), it is impossible to machine. Not only will the part be damaged, but it will also cause danger, such as the turning tool flying out to hurt people. Therefore, in general, for mechanical machining, the material material should be lower than the hardness of the machine tool so that it can be machined. 

There are many kinds of mechanical processing methods, and each mechanical processing method needs to have the process requirements, according to the basic processing methods of mechanical parts, such as the following material, bending, stretching, forming, welding, each mechanical processing method we should pay attention to their process requirements. 

Undercutting can be divided into general punching, number punching, shearing bed opening, laser cutting and wind cutting according to the different processing methods. Due to the different processing methods, the processability of undercutting is also different. The advantages of laser cutting are that the thickness of the sheet is large, the speed of cutting the shape of the workpiece is fast and the processing is flexible. The disadvantage is that it cannot be processed and shaped at one time, mesh parts should not be processed in this way, and the processing cost is high. 

Mechanical processing plant welding methods are mainly electric arc welding, plasma arc welding, gas welding, pressure welding, fusion welding, electroslag welding, brazing, mechanical products welding is mainly electric arc welding, gas welding. Electric arc welding has the advantages of flexibility, mobility, wide applicability, all-position welding, simple equipment used, good durability, low maintenance costs, etc., but labor-intensive, quality is not stable enough, determined by the level of the operator. Gas welding flame temperature and nature can be adjusted, and arc welding heat source than the heat-affected zone is wide, the heat is not as concentrated as the electric arc, low productivity. 

For precision parts machining, not all materials can be precision machined. Certain materials that are too hard for the machined part may damage the part. Therefore, unless these materials are made of special materials for machine parts or laser cutting, they are not suitable for precision machining. 

For precision parts processing materials are divided into two main categories, metallic materials, non-metallic materials. 

Generally speaking for metal materials, the hardness is the largest for stainless steel, followed by cast iron, followed by copper, and finally aluminium, while the processing of ceramics, plastics, etc. is the processing of non-metallic materials. 

First of all, the hardness of the material is a requirement. If the material is harder than the machine, it is impossible to process it. 2.

2. Secondly, the material should be moderately hard or soft, at least a notch lower than the hardness of the machine part. At the same time also depends on the role of the processing device is to do with what, the machine parts reasonable selection of materials.  

In short, precision machining requirements for materials or some, not what material is suitable for processing. For example, too soft or too hard material, the former is not necessary to process, while the latter is not machinable. 

Therefore, the most basic rule is to pay attention to the density of the material before processing. If the density is too high, it is equivalent to a high hardness, and if the hardness exceeds the hardness of the machine part (lathe turning tool), it is impossible to machine. Not only will the part be damaged, but it will also cause danger, such as the turning tool flying out to hurt people. Therefore, in general, for mechanical machining, the material material should be lower than the hardness of the machine tool so that it can be machined. 

There are many kinds of mechanical processing methods, and each mechanical processing method needs to have the process requirements, according to the basic processing methods of mechanical parts, such as the following material, bending, stretching, forming, welding, each mechanical processing method we should pay attention to their process requirements. 

Undercutting can be divided into general punching, number punching, shearing bed opening, laser cutting and wind cutting according to the different processing methods. Due to the different processing methods, the processability of undercutting is also different. The advantages of laser cutting are that the thickness of the sheet is large, the speed of cutting the shape of the workpiece is fast and the processing is flexible. The disadvantage is that it cannot be processed and shaped at one time, mesh parts should not be processed in this way, and the processing cost is high. 

Mechanical processing plant welding methods are mainly electric arc welding, plasma arc welding, gas welding, pressure welding, fusion welding, electroslag welding, brazing, mechanical products welding is mainly electric arc welding, gas welding. Electric arc welding has the advantages of flexibility, mobility, wide applicability, all-position welding, simple equipment used, good durability, low maintenance costs, etc., but labor-intensive, quality is not stable enough, determined by the level of the operator. Gas welding flame temperature and nature can be adjusted, and arc welding heat source than the heat-affected zone is wide, the heat is not as concentrated as the electric arc, low productivity.