Vertical Machining Center
What Is Vertical Machining Center
Vertical machining center is a type of Computer Numerical Control VMC that has vertically oriented spindles that approach workpiece mounted on worktable from above and equipped with tool magazine system and automatic tool changer. A vertical machining center can perform milling, boring, drilling, tapping, thread cutting, and more operations. The vertical mills’ computerized controls allow automation, tool selection/rotation, repeatability, and contour control. These modern CNC machines have increased the productivity of the milling machines to the highest level, bringing about the CNC vertical milling centers. These machining centers vary depending on their axes, function, and other options available.
Advantages of Vertical Machining Center
Operator-friendly – time saving
The structural design of vmc allows much better visibility while working on these machines. The design can make the operators much more easily to catch and avoid any potential problems during the milling process. The user-friendly cnc controls make programming simple, and the design of the machine makes the workpieces fixture more easily; therefore, operators would spend less time on setup and programming.
Space saving
Comparing with other types of machining center, such as horizontal machining center, vertical machining center occupies only about 1/3 floor space. Because vmc could save lots of space, cnc vertical machining center is ideal for small companies.
Higher productivity
High productivity refers to doing work in the shortest possible time without sacrificing of quality and with minimum use of resources. Automation integration boosts the productivity of a vmc by decoupling setup procedures from the machining process through automation.
Less expensive
Vertical machining center is much cheaper. The initial investment is lower than horizontal and you can save costs in your production as well.
Why Choose Us
The vertical machining centers operate on the design model of components. The numerous machine tools and the parameters needed for the parts are transformed into information codes that are generally acceptable and readable by the numerical control device of the machine.
The processing program helps to process the component’ s CNC program automatically. These instruction codes are usually stored on information carriers like disks or punctured tapes while these carriers are sent to the input device. You can read this information and transfer it to the numerical control device. Also, you can use the computer and the machining center to send information directly to achieve the input and output of the component’ s program.
The vertical machining center generally has three linear motion coordinates. There is also a horizontal axis rotary table attached to its worktable. This helps it to fabricate circular workpieces easily.
Components Of A Vertical Machining Center
Rotating spindle
The milling spindle is usually perpendicular/vertical to the working table. It is a rotating shaft with a unit for holding a tool or workpiece. Generally, the spindle shaft acts as a positioned, support, and rotary drive for workpieces.
Work table
The table is flat on which to put the workpiece directly or using several fixtures such as hard clamping vises or milled aluminum parts. The table has an x-axis which includes the left and right motion, while the y-axis has a motion to the front and back. These axes and the z-axis allow you to add unlimited features to workpieces across the planes of motion.
Tool changer
The tool changer increases the productivity of the vertical machine center by allowing the automatic selection of tools for different tasks ranging from rough cutting to fine-hole boring.
Rotating tables
Adding extra axes to the vertical mills can significantly enhance productivity by changing a simple 3-axis milling machine into a 4-axis or 5-axis machine capable of producing complex components with different surfaces like turbine blades.
Coolant system
Most cnc vertical milling centers use recalculating coolant systems to ensure parts and cutter tools are well lubricated. This coolant system often utilizes water and soluble oil amongst various liquids.
Enclosures/full covers
These covers help to reduce the splatters caused by the milling operations. Likewise, it safeguards the machinists and the environment from the machining operation.
Quick loading loaders
Shuttle tables or other automated part-loading systems help to increase the productivity of the cnc vertical machining center while reducing downtime.
Screw/chip conveyor
Chip conveyors or augers can help move chips from the work area to facilitate productivity and eliminate downtime from manually shoveling waste chips.
Applications And Uses Of Vertical Machining Centers
Structures like a basket or a base have irregular shapes. Most of these machined parts require multi-point mixed processing of point, line, and face. Vertical milling centers with automatic machining capability allow you to machine these complex components that are often difficult to create using traditional techniques.
Box-type cnc parts are those with a one-hole system and several cavities within. These box-type parts are common in cars and airplanes. Engine block, spindle box, gear pump shell, diesel engine block. Using a vertical machining center, you can execute 60-95% of the operation of standard machine tools in a one-time clamping. Furthermore, the vertical centers have high accuracy, efficiency, rigidity, and automatic tool changer. Provided the process sequence is well programmed and you utilize proper fixtures and tools, the difficult problems of box-type parts machining can be resolved.
Components like propellers, cams, and impellers with complex curves are standard in aviation and transportation. Traditional machine tools make these components with curved parts, surface contour, and box/casting with closed inner cavities challenging to create with the desired machining accuracy. However, multi-axis vertical machine centers integrated with cnc machine technology help to produce curved parts with the highest precision and accuracy efficiently and in a shorter period.
Vertical machining center offers high flexibility and adaptability. When you change the machined object, you can build and input new programs, change some program segments, or utilize specific special instructions. For instance, you can use the zoom feature to produce parts with the same shape but different sizes. It offers excellent convenience for small batch production, new product trial, or multi-variety production. Also, it reduces the production preparation and trial manufacturing cycle.
Vertical Machining Center Features for Improving Productivity
Metal-cutting capability
Metal cutting capability of vertical machining center could help cutting wide variety of materials. Cutting ability would be the main key for improving the productivity. Therefore, spindle is one of the most important features to evaluate on any vertical machining center.
Tooling support and capacity
A typical vertical machining center is required to produce a variety of parts, perform quick part change-overs, and check tool quality frequently. However, not all vertical machine centers are designed with these considerations in mind ,it would cause frequent downtime that can quickly add up to higher parts costs, extended delivery times, and most especially it loses a significant amount of profit. That is the reason why manufacturers are seeking some solutions to avoid these kinds of issues that a vertical machine center offers a good amount of cooling capacity.
Control software
The control software can facilitate or limit the flexibility of data storage, coordinate systems, probing, and networking of the machine. If the interface is not user friendly, the operators will spend more time to solve the problem. Needless complexities waste the time of the operators and the uptime of the machine.
Automation integration
Automation integration makes different versions of automation hardware and software work together. It combines several subsystems to work together as one large system. The automation integration reduces the need of manpower, and also increases the productivity.
Fixturing and 4th-axis potential
The control software can facilitate or limit the flexibility of data storage, coordinate systems, probing, and networking of the machine. If the interface is not user friendly, the operators will spend more time to solve the problem. Needless complexities waste the time of the operators and the uptime of the machine.
Operator-friendly (ergonomics)
It gives efficiently customize your work environment and make you feel comfortable and safety while you perform your job. It automation can also improve operator ergonomics through additional time and space to set up workpieces.
Productivity improvement
Increasing the spindle utilization and reduce changeover and setup times to improve productivity. Enhance automatic function to improve flexibility and throughput.
Material
Different types of tooling and cutters depend on the type of material being processed or the end product being manufactured.
Accuracies expected
Make sure the VMC can achieve your accuracy requirement, and especially, whether the performance of system or tools can reach your expectation.
Production rates required
Achieve ideal production rate which means VMC need to produce parts in a short time, maintain high quality and minimum use of resources.
Fixed Costs - Tooling Costs
Regular inspection and replacement of parts is necessary to keep the machine in the best performance and producing high quality products.
1.Rotating spindle
The spindle, which is perpendicular to the working surface or table, can hold a variety of cutting tools (or mills as they are sometimes called). The spindle cartridge is mounted in a housing that moved up and down—this direction of motion is called the z-axis.
2.Table
The table is a platform on which to mount workpieces—either directly or through a variety of fixtures like milled aluminum plates or hard clamping vises. The table has a motion of left and right, which we call the x-axis, and front to back, which is called the y-axis. These two axes of motion, coupled with the z-axis, allow for virtually unlimited contouring across the planes of motion.
3.Tool changer
A tool changer greatly increases a vmc's productivity by allowing for the automatic, computer-controlled selection of tools for a variety of tasks from rough cutting to fine hole boring.
4.Coolant system
To keep parts and cutters cool and lubricated, most vmcs employ some sort of recirculating coolant system; which is usually a mix of soluble oil and water but can be a variety of other liquids as well.
5.Chip/screw conveyor
To evacuate the chips from the work zone, a variety of chip conveyors and chip augers may be employed to increase productivity and reduce downtime from manually shoveling out waste chips.
6.Full covers/enclosures
These can be added to reduce the splash/splatter caused by milling operations and protect the operators and environment from the machining process.
7.Rotating tables
Adding additional axes to the machine can greatly increase its productivity by turning a simple three-axis machine into a four- or even five-axis system capable of machining complex components with varying surfaces (such as turbine blades).
8.Quick loading loaders
Another great addition to significantly increase productivity is the use of shuttle tables or other automatic part loading systems. These can decrease downtime and greatly increase the spindle ‘on’ time of most vmc systems.
How to Maintain a Vertical Machining Center?
It is necessary to clean up the whole machine, including the worktable, body, spindle cooling and machining debris on the transmission system of the tool magazine, and take out the tool holder in the tool magazine for anti-rust treatment, and with a special knife handle storage box separately packaging. Anti-rust maintenance is essential. Anti-rust liquid should be applied to the table surface, spindle screw and other parts of the machining center to avoid rust affecting its accuracy. In addition, the telescopic shield of the vertical machining center should also be coated with anti-rust liquid. The vicinity of the Y-axis motor at the bottom of the column is particularly prone to contamination with oil and debris, which needs to be carefully cleaned. If the downtime of the machining center is long, it is necessary to open the X and Y axis shields with a hexagonal wrench, and then apply anti-rust liquid to the screw.
The downtime of the machining center is too long, and the three axes need to run to the middle position of each axis to turn off the equipment, so that it is in a state of stress balance; it is necessary to avoid staying at the limit position of the moving axis, so that the uneven force will affect the accuracy of the equipment. If the processing environment is relatively humid, you'd better block the control box filter and the fan sticker of the electric box to avoid the malfunction of electrical components due to damp weather. The production workshop should prevent rodents from damaging the machine lines and causing processing failures. When the equipment is not suitable for a long time, check the power supply voltage of the machine tool when it is turned on again. The power switch of the machine tool can only be turned on after the voltage stabilizes for about 10 minutes after the main power switch is turned on. Then turn on the other power switches in the electric box in turn. At the same time, it cannot be processed immediately. It is necessary to perform idling preheating of the spindle. Turn on the spindle to preheat for half an hour before normal processing. At the same time, check the oil level of the hydraulic system, the level of the tool coolant, and check whether there is water or oil in the compressed air filter.
If any equipment wants to maintain long-term stable machining accuracy, it is inseparable from the maintenance and protection of scientific systems. If the vertical machining center is not suitable for a long time, the protection work of rust prevention and power switch must be put in place, so as not to affect the accuracy of the equipment when it is restarted for processing, and maintain high-precision and efficient processing. Due to the complexity and precision of CNC machining, a small mistake can lead to the complete scrapping of the workpiece, causing serious damage to the life of the equipment.
Our Factory
Dalian Polyfull Intelligence Technology Co.,Ltd. is a professional machine tool manufacturing enterprise, the main products include lathe, milling machine, grinding machine, etc., and according to customer needs we also can design and manufacture various special purpose machines, to provide relative technology upgrading and transformation services in machine tool field. Meanwhile we are a company that produces automated robots. We can design,develop, install, test, debug industrial robot, it’s units and related accessories including fixture transmission device, positioning device and control system. We can provide welding robot, slicing robot,painting robot,assemble robot，burnishing robot，handing robot，inspect robot，arc welding robot and so on. We have provided many references for the automation industry in China.
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