High-speed milling machine for mold making

In the early 1930s, Dr. Carl Salomon of Germany first proposed the concept of high-speed cutting. The core of the high-speed milling concept is that when the linear velocity reaches a certain value, the temperature and resistance generated by cutting are drastically reduced, and the surface processing of high-speed cutting is added. The quality and removal rate are very high and are highly respected.

1 high-speed milling features

Our understanding of the user with the development of high-speed milling CNC milling machines and development in the late nineties, when just the popularity of CNC machine tools, people think that speed is 8000 r / pm for the high-speed milling machine. With the rapid development of China's machinery industry in recent years, the application of CNC milling machines is becoming more and more popular. The understanding of high-speed milling is becoming more and more clear. Users generally believe that high-speed milling should have the following characteristics:

1.1 The machine tool spindle should have a high speed.
The cutting speed of the machine tool is mainly the improvement of the cutting line speed. The line speed is realized by the speed. It is generally considered that the speed can be high speed milling between 18000r/pm and 24000r/pm. The higher spindle speed is the inevitable condition for high speed milling.

1.2 The drive system must have a high acceleration.
The increase of the spindle speed is inevitably accompanied by the increase of the feed rate of the machine tool. The feed speed must have a high acceleration to meet the requirements of high-speed milling.

1.3 The system must have a wealth of resources.
High-speed milling has a qualitative change in the entire process, the ability of the system to handle the program, the ability to handle the drive have put forward high requirements, which require the support of the CNC system.

Machine tools must have high rigidity and safety features.

High-speed milling puts new demands on the machine, avoiding vibration during machining, and preventing thermal deformation of the machine tool, etc., will become a problem for machine tool manufacturers.

2 gantry type high speed milling machine and its characteristics

Hanchuan Machine Tool is based on the understanding of high-speed milling. The gantry-type high-speed milling machines XK2308A, XK2308B and XK2308C are based on the gantry machining center . The SIEMENS 840D system is mainly used for parts and molds, and the workpiece is clamped once. After that, the processes of milling, drilling, boring, and reaming can be continuously performed automatically, efficiently, and with high precision. Suitable for aerospace, aerospace, automotive, mold, locomotive, shipbuilding, electromechanical, machine tool, printing, textile, engraving and other manufacturing industries. The machine tool is designed with the latest developments and has the following features:

2.1 The structure is reasonable and the rigidity is high.
This series of machine tools has been basically adjusted on the structure of the original gantry machine tool. The main components are analyzed by the finite element method. The ribs are reasonably reinforced. The machine tool girders and beams are integrally cast , and the beam section is widened. Moving on the top of the beam, the rails are also widened. The spindle has a wide range of speeds. The spindle adopts the German KessLer high-speed electric spindle. It has stepless speed regulation. The maximum speed is 24000 rpm. The spindle can output high torque at high speed for strong cutting. The spindle adopts external circulation forced cooling. The spindle bearings are oil-lubricated. Ensure high precision, low noise, low vibration and small thermal deformation of the spindle.

2.2 High speed positioning.
The X, Y, and Z axes are quickly moved by the AC servo motor directly connected through the coupling and the ball screw pair. The X and Y axis guide pairs are all adopted by Schneborg's linear rolling guides. The X, Y and Z axes adopt German high-precision internal cooling ball screw pair. The screw is forced to cool by the center water, and the dynamic and static friction coefficient is small. Improve the bearing and anti-distortion ability, enhance the stability of the drag system, faster response, low speed characteristics, and no crawling.

2.3 Mechatronics.
The machine tool design adopts electromechanical integration structure. The control cabinet and pneumatic device are installed on the column. The machine control panel is placed in the right front of the large shield of the machine tool, which is easy to operate.

2.4 fully enclosed security protection.
A closed safety shield is used on the periphery of the machine to ensure safe and adequate recovery of coolant and iron chips during processing.

2.5 automatic chip removal.
The machine is equipped with a chain-type chip evacuation device and a chip-carrying trolley, which can greatly reduce the labor intensity of the operator.

3 XK2308C mechanical characteristics

3.1XK2308C adopts fixed beam type gantry frame structure, double column fixed layout form gantry CNC milling machine;
3.2 can realize X, Y, Z arbitrary coordinates and three-coordinate linkage control;
The 3.3X, Y, Z three-coordinate motion guide pairs are all imported linear guide pairs;
3.4X, Y, Z three-coordinate transmission components are imported precision ball screw pairs, which use ball bearing special bearing support;
3.5X, Y, Z three-axis servo feed adopts AC servo motor, and the movement is stable;
3.6 spindle speed 24000rpm, spindle bearings use high-speed, high-precision spindle bearings, using oil circulation cooling, the output maximum rated torque is 61N.M;
3.7 The spindle adopts imported electric spindle, its rated power is 19KW, and the maximum power can reach 26.7KW in 30 minutes;
3.8 Centralized automatic lubrication station quantitatively lubricates the guide rail pair and other lubrication points to ensure the smooth movement of moving parts;
3.9 using butterfly spring clamping tool, hydraulic loose knife;
3.10 Optional fourth axis for complex parts and mold processing.

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