Machine introduction
The frame structure of the machine tool, combined with the grinding sliding guide rail, has good rigidity, strong shock absorption, wide processing range and good stability. It can be equipped with a variety of attachment milling heads, with manual and automatic head changing functions, expanding the processing range of the machine tool, and one clamping of parts can complete the processing of multiple processes at the same time
The product structure and technology are mature and the quality is stable. It is suitable for various mechanical processing fields such as automobile, ship, printing, packaging, textile, military industry, mold and so on. The machine tool has the characteristics of high efficiency, high precision and high rigidity, and is an ideal choice for enterprises to process high-efficiency and large-scale parts.
1.General layout of the machine
GMC3060 fixed beam gantry machining center overall adopts gantry frame layout, mainly consists of base,table, column, crossbeam, slider, ram, lubrication system, cooling system, pneumatic system, safety protection, guide rail protection, CNC system, electrical control, tool magazine system and other parts.
The main parts including base, table, column, beam, slider, ram, etc. are designed by 3D finite element optimization, adding non-ferrous metals according to European "M" Meehanne quality standards, with resin sand casting process, and after perfect heat treatment process (rough machining and then secondary aging treatment, etc.) to eliminate casting, cutting residual stress, so that the casting has good rigidity, no deformation, to ensure the strength, rigidity and stability of the machine.
1) X-axis: the table adopts double-layer reinforced hollow anti-vibration structure (Fig. 1); the bed is designed with box-type structural body (Fig. 2), which adopts overlapping triangular cross-sectional structure design, and circumferential rib support, with good stability and rigidity. The table moves along the three heavy-duty linear roller guideway parallel to each other in the bed, and its X-axis drive adopts AC servo motor to drive the ball screw rotation through the precision planetary reducer, at the same time, in order to ensure the accuracy of X-axis transmission, the following auxiliary support is added directly below the screw to realize the longitudinal movement of the table.
2) Y axis: two heavy-duty linear roller guide rails which are are orthogonal and perpendicular to each other are adopted, 2pcs with 5 blocks, upper 3pcs lower 2pcs and combined with a rectangular hard rail, forming a unique structure of "linear - hard combination" (see Figure 3), good rigidity, fast response time; Y axis drive using AC servo motor through the speed reduction reducer, drive the ball screw rotation, to achieve the lateral movement of the slider along the beam, the beam is fixed at the top of the column on both sides of the machine, the Y axis has good vibration damping performance, to ensure the stability of cutting.
The front and rear of the slider is a ring type structure (Fig. 4) with a mesh structure design, which has good stability and rigidity.
The crossbeam adopts large cross-sectional barrel structure with internal "sun shaped MiZi character" tendon plate arrangement (see Figure 5), which has high bending and twisting resistance.
The columns all adopt the imitation "boot type" design (see Figure 6), which effectively improves the inclination of the columns and enhances the stability of the whole machine.
3) Z axis: the four-sided ring hugging hard rail square ram, and by manual scraping and research, can ensure the accuracy of the guide rail and can greatly increase the life of the hard rail; Z-axis drive using AC servo motor through the reducer to reduce speed, drive the ball screw rotation, to achieve the vertical movement of the ram along the slider.
Both sides of the ram are symmetrically arranged with liquid nitrogen balancing cylinders (see Figure 8), and the pivot points of the two balancing cylinders are in the same line with the center of gravity of the ram, in line with the "center of gravity drive" design concept, which reduces the deflection torque of the ram up and down movement, and also reduces the vibration caused by the frictional force of the deflection torque, thus increasing the machining accuracy of the machine.
The ram is a square ram structure (see Figure 9), the cross-sectional area of 410mm × 410mm ,material QT600, the material performance indicators are much higher than HT300。
The ram cross-section differs in size according to the Z-axis stroke, the specific configuration is Z-axis 1250mm stroke, cross-section 450mm×450mm (standard configuration); Z-axis 1500mm stroke, cross-section 500mm×500mm. (Optional)
2. Machine transmission system
1) Feed transmission system
Machine X \ Y \ Z axis feed system are used AC servo motor through the speed reduction reducer to increase the torque, drive precision ball screw rotation, drive the moving parts along the fixed parts on the heavy-duty linear guide (or hardened hard gauge) movement, ball screw using both ends of the fixed support pre-tensioned structure, to achieve smoothness, accuracy and rapidity of movement. The ball screw support bearings at both ends adopt imported famous brand, special ball screw support bearings.
2) Main transmission system (Fig. 10)
The servo main motor is placed on the top of the ram, and is directly connected to the spindle unit through precision gear two-speed gearbox + carbon fiber coupling to realize the machine spindle cutting processing. The motor is placed on the top of the ram, which can reduce the heat transfer from the motor to the ram, reduce the thermal deformation of the ram, and the motor vibration source is far away from the cutting area, which makes the machining more smooth.
Weida precision gearbox has the features of constant cutting force in a large speed range; low vibration and low noise, which makes the cutting process smoother and the surface craftiness of the workpiece better; compact structure and high transmission efficiency.
Equipped with Taiwan direct drive spindle unit (see figure on the right), the main characteristic parameters:
Spindle taper: BT50-210
Pulling force: 18000N±10%
Max. torque: 1350Nm, Short-time overload 1670Nm
Max. Speed 6000rpm
Spindle upper end bearing inner diameter: 85mm
Lower spindle bearing inner diameter: 100mm
3. Coolant, lubrication system
The machine tool is equipped with cutting fluid filtration and cooling supply system, equipped with Taiwan high flow cooling pump and large capacity water tank to fully ensure the circulation cooling. The machine tool adopts the spindle end of the external processing in the jet cooling, and the outside of the table cleaning water gun iron scrap scouring cleaning.
4. Pneumatic system: The pneumatic system of this machine adopts imported famous brand, mainly completes the following functions: spindle front seal, spindle taper hole blowing, tool changing pneumatic door, etc. The configured pneumatic two-piece can filter the impurities and moisture in the air source to prevent the impure gas from damaging and corroding the machine parts. The solenoid valve set is controlled by PLC program to ensure that the spindle loosening, spindle center blowing and spindle tool clamping are completed quickly and accurately.
The machine requires supporting air source pressure ≥ 0.6MPa, filtration precision 100μm, to ensure the normal working performance of the equipment, the air source compressed air, if not up to the machine air source requirements, should be added to the machine before the air supply a set of air source purification device (dehumidification, oil removal, filtration).
5. Machine guard
The machine adopts CE safety standard shield, which not only prevents coolant from splashing, but also ensures safe operation and pleasant appearance. The machine bed guide adopts stainless steel telescopic shield protection, and the cross beam guide adopts organ type shield, and all adopt labyrinth type dustproof to prevent chips and coolant from entering into the machine, so that the guide and ball screw are protected from wear and corrosion.
Standard configuration: The whole machine adopts semi-protection, the observation window adopts tempered glass, protection door opening power-off protection (*Non-standard configuration, special order required).
6. Chip discharge system
Spiral chip conveyor (standard) is configured on the left and right sides of the machine table, and chain plate chip conveyor and chip collecting car (*Non-standard configuration, special order required) are configured to facilitate the collection of iron chips.
7. Cleaning system
In order to clean up the iron chips inside the protection in time and facilitate the regular cleaning of the operator, the handheld high-pressure cleaning water gun is configured on the protection side.
8. Lubrication system
The lubrication of the machine tool guide rail is directly lubricated by the timing and quantitative centralized lubrication pump to the moving parts to lubricate the three coordinate guide rail surface: bed - table guide rail surface, slider - cross beam guide rail surface, slider - ram guide rail surface and screw nut. After the machine is powered on, the lubrication pump motor makes the lubricating oil injected from the oil pump to the slider and ball screw nut of each guideway through the oil pipe and connector. Timing lubrication device with oil level switch, when the oil tank lubricating oil level is lower than the set height, the machine will alarm. Generally, oil should be added to the oil tank every two weeks or so.
9. Auto tool change system (Fig. 22)
Taiwan arm type tool magazine is equipped
Automatic tool change system is used to realize tool exchange in machining center, including tool magazine, manipulator and other components. When a tool change is needed, the CNC sends a command and the automatic tool change system performs the tool change.
Note: Automatic tool changing system is non-standard configuration, special order is required.
10. Other configuration
1) Lighting system of processing area
The working area is equipped with lighting to adapt to night work; the machine tool is equipped with three color lights to indicate the program running, work cycle completion and fault alarm three kinds of information.
2) Electrical box
Adopting closed electric box, the electric box adopts air conditioner for heat dissipation to ensure the normal work of electrical equipment. The electric box adopts slot board wiring structure, the arrangement of components and wiring is reasonable, neat and beautiful, which is convenient for maintenance. The electric box is equipped with internal lighting and debugging sockets. A certain space is reserved in the electrical box to facilitate the expansion of functions.
The air conditioner of the electrical cabinet is domestic famous brand, which can realize completely independent closed air circulation inside and outside to prevent dust, oil mist and moisture from entering the interior of the electrical cabinet; effectively control the temperature and humidity inside the electrical cabinet to prevent premature aging and failure of electrical components.
3) Air gun
The machine is equipped with a cleaning water gun as well as a cleaning air gun, effectively saving the operator's cleaning time.