Advantages and schemes of ultra-high speed cutting technology;
First, the advantages of high-speed cutting technology
(1) high cutting speed.
High-speed cutting cuts the die blank at a speed several times higher than that of conventional cutting. Because the excitation frequency of the spindle of high-speed machine tool far exceeds the natural frequency range of the system, the cutting process is smooth and impact-free.
(2) high cutting efficiency
Using the cutting technology of high-speed milling machine, the rough and fine parts of the die surface can be cut at one time, and the use of high-speed cutting greatly improves the development speed of mechanical equipment.
(3) Good cutting quality
Due to the adoption of extremely small step size and cutting depth, high surface quality can be obtained in high-speed cutting process, and even the process of fitter dressing can be omitted.
(4) the cutting process is short
Conventional milling can only be carried out before quenching, and the deformation caused by quenching must be trimmed and finally shaped. Now there is no need for surface hardening, and it can be done by high-speed cutting. In addition, due to the reduction of cutting amount, some working procedures are saved and the cycle is shortened.
(5) Widely used in cutting.
When cutting at high speed, the cutting force is greatly reduced and the cutting process becomes easier. High-speed cutting has great advantages in cutting high-strength and high-hardness materials, such as automobile dies with complex contours and high hardness.
Second, the high-speed cutting technical scheme
(1) First data
The surface selected as the fine datum plane should be arranged first, and then the cutting of other surfaces should be arranged based on the fine datum plane. Before the start of precision work, the top should be trimmed to improve the precision of precision work, and then the precision work of each cylindrical surface should be arranged.
(2) coarse before fine
This refers to the arrangement of surface rough machining first, and then finishing. The main function of rough machining stage is to remove most of the allowance, and the semi-finish machining stage is to prepare the main surface of the part for finish machining. The finishing stage is to make the main surface of the part meet the design requirements, and the finishing stage is to improve the dimensional accuracy and surface quality of the working face.
(3) the first time.
The main surface generally refers to the design datum plane and important working face on the part. These surfaces are the main factors that determine the quality of parts, so when determining the sequence, the working procedure arrangement of the main surfaces should be considered first to ensure the accuracy of the main surfaces. After arranging the order of the main faces, arrange the secondary faces from the perspective of convenience and economy.
(4) Face first and then hole.
This mainly refers to the box and bracket parts. Generally, such parts have both planes and holes or hole systems. At this time, you should cut out the plane first, and then make holes or hole systems based on the plane. In addition, drilling or boring holes on the surface of the blank is easy to make the bit deviate or punch. At this time, you should also face the hole first to avoid the above situation.
Third, the choice of high-speed cutting oil
The factors that affect the accuracy of ultra-high speed cutting are cutting positioning datum, tool accuracy, tool rationality, quality of workpiece raw materials, cutting oil performance and so on.
(1) silicon steel cutting oil
Silicon steel is a material that is relatively easy to cut. Generally, for the cleanliness of the finished workpiece, cutting oil with low viscosity will be selected on the premise of preventing cutting burr.
(2) Carbon steel cutting oil
When selecting carbon steel cutting oil, the optimum viscosity should be determined according to the difficulty of the process, and then the problem of rust of chlorine cutting oil can be avoided by using sulfur cutting oil.
(3) stainless steel cutting oil
Stainless steel is easy to harden, so cutting oil with high oil film strength and good sintering resistance is needed. Cutting oil containing sulfur and chlorine compound additives is generally used to ensure extreme pressure performance and avoid burrs and tool wear on the workpiece.