Living turret technology is one of the core technologies in turn-milling compound machine tools. The turning-milling machine tool can realize the machining of complex parts on the same machine tool, including turning, drilling, threading, slotting, keyway cutting, face cutting, c-axisangle drilling, cam cuttingnumerical control machineComplete and greatly reduce the production process and accumulated tolerance. The living turret of turning-milling CNC machine tools generally includes disc turret, square turret and crown turret, and the disc turret is the most widely used.
Characteristics of CNC Machine Tools for Turning and Returning Railway Units
(1) parameter setting before machining is less, sometimes even one-off;
(2) Complex workpieces do not need to be processed on multiple machine tools;
(3) Reduce the clamping times of workpieces;
(4) The number of machine tools on the processing site is reduced, and the requirements for site area are less.
Types of living turret
At present, the living turret equipped with CNC machine tools in the market is mainly divided into two main streams. One is the living turret developed by Japanese machine tool manufacturers, which is difficult to apply because there is no uniform specification for its tool holder, and the other is the living turret developed by the tool turret manufacturers. At present, the major turret manufacturers are all European companies, such as Sauter (Germany), Dup1omatic (Italy), Baruffa1di (Italy), etc., and most of them follow the VDI Toolholder System specification in the design and development of turret. Because VDI specification has a large market share, the products of European turret manufacturing companies are the mainstream in the current market. living turret is classified according to the living source, cutter head form, shaft coupler and living cutter seat:
(1) source of poer: the living source refers to the living source when the tool turret changes tools. In order to adapt to the trend of rapid tool change, the servoelectric motorWith the increase of output and material strength, hydraulic motors are gradually replaced by servo motors.
(2) types of tool disk: according to the processing method, the cutterheads can be roughly divided into round axial cutterheads and polygonal radial cutterheads, as shown in Figures 6-3 and 6-4. The circular axial cutterhead has better rigidity, but the tool interference range is larger, while the polygonal radial cutterhead, though slightly less rigid, can be used for back processing when matched with the auxiliary spindle. In addition, there is another kind of star-shaped axial cutterhead, as shown in Figure 6-5. Although not all cutterheads have milling function, the range of cutter interference is much smaller than that of dry circular cutterhead.
(3) Hirth-type gearing coupling: the shaft coupling directly affects the accuracy and rigidity of the living tool turret during cutting, and can be divided into two types: two-piece type and three-piece type. At present, the living tool turret is of three-piece type. As shown in Figure 6-6, although the rigidity of the three-piece type is worse than that of the two-piece type, the waterproof and anti-chip properties of the three-piece type structure are all good, and the cutter head only needs to rotate without pushing out.
(4)living tool holder:living tool holder, also known as “living head” (see figure), is a tool holder used on the living turret of turning center, which can clamp drill bits, milling cutters and taps. It can be driven by the motor of the living turret to drive the tool to rotate, and can be used for milling, drilling and tapping after the workpiece is turned. Workpieces previously required to be completed on lathes, milling machines and drilling machines can be clamped on the turning center at one time to complete, so that the workpiece with the living tool holderCnc latheTurn into “turning-milling compound”machining center“,referred to as” turning center “for short, it can be seen that the living tool holder greatly expands the function of the CNC lathe. At the same time, the living tool holder is an important connection between the living tool turret and the cutting tool. It plays a very important role in the whole knife chain system. The performance of the living tool holder itself is an important factor to determine the final machining effect of the workpiece.
living tool holder
Classification of living tool holder
According to the structure and shape, it can be divided into 0 (axial) tool holder, 90 (radial right angle) tool holder, right angle backward (also called bit short) tool holder and other special structures; according to the cooling mode, it can be divided into external cooling tool holder and external cooling plus internal cooling (central cooling) tool holder; according to the output speed ratio of lead people, it can be divided into constant speed tool holder, increasing speed tool holder and decreasing speed tool holder; for example, according to the input interface.
The input interface of living tool holder depends on the interface form of machine tool living tool turret. Generally, living tool turret will follow VDI specification. Figure 6-8 shows the interfaces of several living tool holders, among which the straight DIN1809, zero positioning gear DIN 5480 and involute bolt DIN 5482 are the most commonly used tool holders, and DIN 5480 interface can be used for rigid tapping, and it is easy to disengage and engage, so it is gradually widely used.
living turret is a kind of living source, which can independently provide the main motion and feed motion to the cutter, and then complete milling, drilling, mantising and other processing procedures. As an important mechanism of turning-milling compound machine tool, it is not a new invention, but evolved from the common lathe tool rest. It can be classified according to the form of living source, cutterhead, shaft coupler, interface of living cutterhead, etc. The emergence of the living tower. The boundary of machine tool types is blurred, and the production and processing efficiency is greatly improved.
Post time: Apr-24-2022