Everyone wants to know more about HSK CNC toolholders, so let's take a brief look at HSK CNC toolholders. High-speed cutting is a relative concept and is constantly changing with the progress of the times. It is generally believed that the speed of high-speed cutting or ultra-high-speed cutting is 5 to 10 times that of ordinary cutting. Cutting speed can be divided from different angles. With the increase of cutting speed, the cutting force will be reduced by more than 15 to 30%, and most of the cutting heat will be taken away by the chips. The surface quality of the processing can be improved by 1 to 2 levels. The improvement of production efficiency can reduce the manufacturing cost by 20% to 40%. Therefore, the significance of high-speed cutting is not only to obtain higher surface cutting quality.
Figure 1 is a schematic diagram of the connection between the tool handle and the spindle. The connection between the tool handle and the spindle adopts an expansion clamping mechanism. The pull rod moves to the right under the tension force, driving the clamping jaw to open. The outer conical surface of the clamping jaw presses against the 30. conical surface of the HSK tool handle hole. The hollow short taper handle produces elastic deformation, so that the end face of the tool handle is close to the end face of the spindle, thereby realizing the double-sided positioning clamping of the tool handle and the conical surface and end face of the spindle.
Fig. 1 Schematic diagram of HSK tool holder and spindle connection After the HSK tool holder is connected and clamped to the spindle, contact stress is generated between the matching tapered surfaces. The contact stress is determined by the actual interference between the tool holder and the spindle and the actual clamping force on the tool holder, and the actual interference and actual clamping force are closely related to the spindle speed. The contact stress model of the tool holder and spindle connection tapered surface at any speed is established below. The contact stress P is equal to the sum of the stress P1 generated by the actual interference on the connecting cone surface and the contact stress p2 generated by the actual clamping force on the connecting cone surface, that is, p=p1+p2
Foreign countries have studied high-speed cutting technology relatively early, dating back to the 1960s. At present, it has been applied to the processing of composite materials such as steel, cast iron and its alloys, aluminum, magnesium alloys, super alloys (nickel-based, chromium-based, iron-based and titanium-based alloys) and carbon fiber reinforced plastics in various industries such as aviation, aerospace, automobiles, and molds. Among them, the processing of cast iron and aluminum alloys is the most common. The processing speed of steel, cast iron and its alloys can reach 500-1500m/min, and the processing speed of aluminum and its alloys can reach 3000-4000m/min. my country started late in the field of high-speed cutting, and only began to study high-speed hard cutting in the 1980s. The cutting tools are mainly high-speed steel and cemented carbide, and the cutting speed is mostly 100-200m/min, and the high-speed steel is within 40m/min.
The cutting level and processing efficiency are relatively low. In recent years, although there has been a relatively deep understanding of high-speed cutting technology, and some imported CNC machine tools and machining centers can also meet the requirements of high-speed cutting processing, due to reasons such as tools, high-speed cutting technology is also less used. At present, high-speed cutting technology is mainly used in molds, automobiles, aviation, and aerospace industries. Generally, imported tools are used to process cast iron and aluminum alloys. High-speed cutting technology is mainly divided into two aspects. On the one hand, it is high-speed cutting tool technology, including tool materials, tool holders and tool holder systems, tool dynamic balancing technology, high-speed cutting database technology, detection and monitoring systems, etc.; on the other hand, it is high-speed CNC machine tool technology, including the static and dynamic thermal characteristics of the whole machine structure of the machine tool, electric spindles, linear motor feed systems, high-speed and high-acceleration performance of CNC and servo systems, bearing lubrication systems, tool cooling systems, etc.