The large-scale CNC gantry milling machine drives the cutter through the drive spindle, and uses the movement of each axis of the machine tool to carry out various milling, drilling and other mechanical processing on various metal and non-metal materials. The workpiece is directly fixed on the workbench. Large CNC gantry milling machine adopts fixed gantry layout. The main components of the machine tool include: base bed, workbench, left and right columns, cross beam, fixed beam, top beam boring and milling head, transmission system, control system, etc. The inner side of the lower part of the left and right columns is firmly connected with the bed, the inner side of the upper part of the left and right columns is firmly connected with the fixed beam, and the top of the left and right columns is firmly connected with the top beam, so as to form a closed frame structure with high rigidity. The cross beam is installed on the left and right columns.
The longitudinal horizontal movement of the workbench along the base bed is x axis; The milling head of the machine tool moves horizontally along the cross beam with the sliding table as the Y axis; The boring and milling head of the machine tool moves vertically up and down along the guide rail of the slide table as the Z axis; The crossbeam of the machine tool moves vertically up and down synchronously along the left and right column guide rails as the U-axis; The right milling head is perpendicular to the right column guide rail as axis A; The lateral horizontal movement of the side milling head along the slide guide is axis B; The left milling head is perpendicular to the A1 axis along the left column guide rail; The lateral horizontal movement of the side milling head along the slide guide is axis B1;
1. Bed casting of machine tool
HT250 ~ 300 grade strong and tough cast iron is used and tempered twice to eliminate its internal stress. The second tempering is carried out after the completion of heat treatment or rough machining. The surface of each guide rail is subject to ultra audio frequency quenching and precision grinding. The surface hardness reaches hrc53 ± 5 degrees.
2. Guide rail of each axis of the machine tool
(x-axis) the x-axis uses an AC servo motor to drive the ball screw to move, which can realize intermittent positioning feed, micro feed, stepless speed regulation and other functions. The electronic handwheel is used to realize the tool setting function and manual micro feed function. The workbench adopts double V-shaped sliding rail structure, and the workbench is pasted with imported wear-resistant adhesive.
(Y-axis) the y-axis uses an AC servo motor to drive the ball screw to move. The large CNC gantry milling machine can realize intermittent positioning feed, micro feed, stepless speed regulation and other functions. The electronic handwheel is used to realize the tool setting function and manual micro feed function. The cross beam adopts double-layer zero clearance and large span combined sliding rail structure. Y-axis sliding table is pasted with imported wear-resistant adhesive. It can prolong the service life of the machine tool and improve the accuracy of the machine tool. Reduce friction coefficient and prevent machine tool from creeping. (the beam zero gap structure has been invented by the state! No.: 2010 10240166.2)
(Z-axis) the z-axis uses an AC servo motor to drive the ball screw to move, which can realize intermittent positioning feed, micro feed, stepless speed regulation and other functions. The electronic handwheel is used to realize the tool setting function and manual micro feed function. Z-axis adopts heavy-duty rectangular sliding rail with good rigidity and high stability in heavy cutting.
(U-axis), the U-axis uses AC asynchronous motor to drive the precision ball screw of the left and right columns to achieve synchronous movement. The U-axis adopts heavy-duty rectangular sliding guide rail, and the U-axis adopts hydraulic locking device. After the cross beam is adjusted to the appropriate height, the machine tool will automatically lock the cross beam and the column into a whole. Greatly improving the overall strength and rigidity of the machine tool.
(other axes) the machine tool can install milling heads on the cross beam and the left and right columns according to the needs of customers. So as to expand the machining function of the machine tool
3. Locking device of machine tool
Lifting movement of the beam of the machine tool (U-axis); Lateral movement of end milling head (Y axis); The lifting movement (a-axis) of the side milling head adopts a new full-automatic hydraulic locking device. Mechanical locking device is used for boring and milling head movement. (the new hydraulic locking device has obtained the national, No.: 2010 20234321.5)
4. Boring and milling head of machine tool
This machine tool adopts Taiwan brand heavy boring and milling head. The spindle, gear, spline shaft and transmission shaft of the boring and milling head are all made of chromium molybdenum alloy (scm415k), which is carburized and hardened by precision grinding (the accuracy reaches jis1 level). To ensure operational accuracy and service life. In order to meet the processing needs, our company has designed a booster. The speed reducer can be directly installed on the boring and milling head to increase the original speed by 5 times to more than 3000 revolutions per minute. This greatly improves the efficiency of cutting and drilling with small tools. (optional. This part has been submitted to the application country)
5. Electrical control system of machine tool
This machine tool is controlled by Taiwan Baoyuan CNC system. 10. Y and Z axes are fed by servo motors driving precision ball screws. The large CNC gantry milling machine can realize linkage, single action, etc., and fully realize the digital automatic control function. Other electrical components are imported electrical components.
7. Lubrication system
X-axis guide rail adopts independent automatic circulation pouring lubrication system; All other parts are equipped with timing and quantitative automatic lubrication device, which is equipped with low oil level signal and oil output state detection of oil pump. The above devices make the operation of the machine tool humanized, ensure the service life of the machine tool more effectively, and improve the machining accuracy of the machine tool.
8. Cooling system
The machine tool can use cooling liquid or air cooling device to cool the tool. If cooling liquid is used, high lift water pump shall be used. A coolant recovery tank is installed on the base of the machine tool to collect the coolant into the cooling box for recycling. (optional)