DFM5028-NC fixed beam CNC gantry machining center

DFM5028-NC fixed beam CNC gantry machining centerProduct Introduction

1、 Overview of Machine Tools

DFM5028-NC fixed beam CNC gantry machining center inherits the advantages of strong rigidity, symmetrical structure, and strong stability of traditional gantry machine tool foundation frame, and draws on the characteristics of domestic and foreign machine tools to independently develop a gantry fixed and worktable mobile CNC gantry milling machine. The whole machine adopts three-dimensional software modular design, and the main structures are analyzed using finite element method to optimize the reinforcement structure and design the moving parts reasonably.

This machine tool can efficiently complete various processes such as drilling, boring, and tapping of continuous flat surfaces, steps, grooves, complex surfaces, cavities, and various holes after one clamping of the workpiece. The machine tool has advanced technical indicators and configurations, mature product structure and process, stable quality, high spindle output torque, and excellent fast response characteristics. It is widely used in various semi precision and precision machining of molds and machinery manufacturing industries.

2、 Overall layout of machine tool

This machine tool adopts a gantry frame fixed structure and a worktable moving structure, mainly composed of worktable, base, column, crossbeam, drag plate, spindle box (slider) and other components. The workbench moves longitudinally along the base (X-axis); The gantry frame composed of columns and beams is installed on the side of the base, and the cross drag plate carries the spindle box (slider) to move left and right along the beam (Y-axis); The spindle box (slider) moves vertically up and down along the cross drag plate (for the Z-axis).

3、 Structural characteristics of machine tools

1. Spindle

The main shaft adopts Taiwan, China brand BT50-210 model and precise P4 grade special bearings for machine tool main shaft, with increased shaft diameter, good rigidity, large torque, good motion stability and high precision. The main shaft bearing is lubricated with grease, which can provide constant and reliable lubrication for the main shaft bearing, and is maintenance free for a long time. The spindle adopts a butterfly spring that tightens the tool by applying a tension pin on the handle through four claws, and is equipped with a hydraulic cutting cylinder for easy loading and unloading of the tool. The taper part at the front end of the spindle adopts a split design. After the spindle is used for a long time and the taper hole is deformed, the taper handle part can be replaced separately to restore the accuracy of the spindle taper hole.

The high-power AC servo spindle motor is transmitted to the spindle after being reduced by a reducer/belt, meeting the high torque output at low speeds of the spindle and suitable for strong heavy cutting.

Standard spindle oil cooler, providing constant temperature cooling for the spindle through circulating cooling oil, extending the service life of the spindle.

2. Guide rail

The main basic components of the machine tool, including the base bed, worktable, column, crossbeam, trailer, and spindle box, are all made of HT300 high-strength cast iron. The overall reinforcement and reasonable arrangement of reinforcement ribs make the whole machine have good shock absorption, stability, high structural strength and rigidity, and good stability in heavy cutting. Advanced heat treatment aging technology is used for large castings, with secondary aging treatment after rough machining to minimize internal stress and prevent deformation, ensuring the stability of machine tool accuracy.

The X-axis adopts a silver RG65 heavy-duty roller track, the Y-axis adopts a composite structure of silver RG65 heavy-duty roller track and hard track, and the Z-axis adopts a large section fully enclosed square slider. The surface of the guide rail is quenched at medium frequency and then precision ground, and the surface hardness of the guide rail reaches HRC53 ± 3 degrees. After pasting wear-resistant adhesive on the sliding guide surface and manually scraping it, the friction coefficient is low, reducing low-speed crawling of the machine tool and achieving good positioning accuracy; Good damping characteristics, able to effectively absorb cutting vibrations, improve tool cutting volume and durability.

3. Spindle box

The spindle box adopts a large cross-section four sided enclosed embracing square slider structure, namely cast iron plastic friction pair, with reasonable reinforcement ribs arranged inside, which has good rigidity and shock absorption, suitable for strong heavy cutting.

The spindle box moves and guides in the drag plate, and is equipped with two symmetrical nitrogen balance cylinders to balance the weight of the spindle box. It has small inertia, flexible movement, reliable positioning, and good stability.

4. Feed transmission system

The three-axis drive is driven by the servo motor through the precision planetary reducer to rotate the screw rod. The large diameter grinding double nut ball screw rod made in Taiwan, China, China is used, which is compact in structure, stable in movement and high in accuracy. Using imported screw rod support bearings, pre tension is applied to both ends of the screw rod to eliminate accuracy loss caused by thermal elongation, forming a stable high rigidity mechanical transmission system.

The Z-axis servo motor is equipped with an automatic brake function. In the event of a power outage, the automatic brake will hold the motor shaft tightly, preventing it from rotating and causing the spindle box to fall after the power is cut off.

Three axis travel protection: The servo motor adopts an absolute value encoder, which is set with limit protection by the numerical control system parameters to prevent overshoot of moving parts and protect the safety of the equipment.

5. Hydraulic system

The hydraulic system is mainly used for automatic spindle loosening and tool magazine drive. The system adopts integrated installation to ensure the reliability of the whole machine operation and facilitate maintenance and repair

The spindle box (Z-axis) adopts a nitrogen balance system, which has fast response, small pressure changes, and no energy consumption. It is equipped with a pressure detection switch and Z-axis feed interlock.

6. Pneumatic system

The pneumatic system mainly consists of spindle blowing (cleaning spindle cone handle), tool cooling, and Y/Z axis locking pipelines.

lubrication system

The X-axis guide rail and screw rod adopt a forced circulation lubrication system. The lubricating oil enters the distributor through the lubricating oil pump and is then injected into the oil inlet hole of the wire rail slider and the screw rod nut; The other parts adopt a thin oil quantitative centralized lubrication system, which is controlled by PLC program to achieve automatic lubrication of the guide rail and screw components at fixed time and quantity. Ensure timely, accurate, reliable, and pollution-free lubrication.

7. Automatic chip removal

The spiral chip conveyor is installed in the middle of the worktable and column, and is matched with a chain plate chip conveyor at the end of the machine tool to lift the iron chips and discharge them into the iron chip car.

8. Cooling system

The tool cooling adopts compressed air cooling. After the air source is dried and filtered, it is sprayed from the nozzle at the end of the spindle box to the cutting tool and cooled. External coolant and center outlet cooling can also be optionally installed to cool the tool (special optional accessories).