Significantly reduced tool change time: HSK clamping technology for lathes and milling machines

In the near future, the HSK technology for lathes will be completely standardized. The current complete HSK clamping technology program has formed a detailed standard specification. HSK as a tool interface should be attributed to its complete success in high-accuracy and high-rigidity rotary tools. At the same time, this interface is standardized. It has nothing to do with the manufacturer and the industry. However, there are still problems in the introduction and application of fixed tools for HSK tool interfaces. The reason is that for a rotary tool, the tolerance between the groove on the tool holder and the projection on the tool holder has no great influence, so in the standard this tolerance is set to be relatively large. However, for fixed tools, the tolerances of this raised device play a very crucial decisive role. If the tolerance is too large, the result will be very inaccurate cutting height and cutting position. The future HSK-T lathe standard and Japan's Commissioning Committee for Interfaces for Turning and Milling Machines (ICTM) standard will minimize this bumper tolerance and enable rapid tool change without the need for renewed work. Tool change time significantly reduces the application of HSK technology in the rotation has brought important advantages. The first is that HSK technology significantly reduces tool change time. Until now, the tool change in the previous standard system took about 10 to 15 minutes, while in the system with the HSK interface, the tool change time was reduced to less than 30 seconds. In addition, the high accuracy of the HSK interface allows the direct application of pre-adjusted tools without the need for sample inspection or correction on the machine.

Figure 1 Four different tool holders form the basic components of Mapal's HSK assembly technology program

The clamping force of some new fixtures in Figure 2 is twice that specified in the HSK-T standard

Mapal, based in Aalen, one of the first manufacturers, has developed a complete HSK mounting technology program for lathes and milling machines with rotating devices. This technology has considered the future HSK-T standard and can achieve the necessary high clamping force. The four different tool holders shown in Fig. 1 are the basic components of this new clamping technique. These components can be mounted on the tool holder with which the machine tool is to be used. Although these four components are different in appearance, they all have a large axial channel. With this type of tool holder and tool, on the one hand, the path of the cooling lubricant can be optimized. On the other hand, additional functional elements can also be introduced. For example, this makes it possible to mount a powered tool on a rotating device with a manual clamp, which has a great clamping force. Sometimes this clamping force is even twice the required clamping force specified in the HSK-T standard (as shown in Figure 2). The machining of the highest precision and the machining starting from the smallest diameter hole all require the complete elimination of the protruding device tolerances. In order to introduce this type of machining, Mapal offers a system that can ensure the precise position of the rotary cutting. An additional option is provided to integrate this system with tool safety protection. When the HSK tool holder is not clamped, the tool does not slip from the tool holder into the machine. Reduce accident risk. The tool is protected. Details of HSK Clamping Process The new Mapal Cutter is described in detail as follows: Front Clamp Mounting Flange A sturdy clamp provides a strong connection and great rigidity. The clamping force is a constant and much higher than the standard. Tool change is assisted by a mounting bracket that can rotate more than 65 degrees around the axis. The mounting structure of this mounting bracket is designed to be very short. High rigidity and strong connection of the raised jig mounting flange are achieved through a firm clamp. The clamping force of this clamp reaches and exceeds twice the value specified in the standard. Tool change is accomplished with the help of a wrench that rotates more than 50 degrees around the axis. Its shape is slim and slender. Automatic Fixture Mounting Flange This fixture, which has a hydraulic pressure of less than 50 bar, can also achieve a clamping force that is twice the standard value. A small hydraulic cylinder was refitted to the rear of the HSK. The tool change can be easily accomplished by pressing a button. Its structural design is very compact. This tool holder introduced by the axial fixture mounting flange is parallel to the shaft. The tool change is achieved by a sleeve nut rotating from the rear to the shaft. The clamping force is much higher than the standard value, but the torque is very small. Because the tool holder with axial fixture has only axial fixture movement. So it's wear is very small, and the situation is quite high.