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Vertical CNC milling machine
Milling machines are divided into six types in terms of type, which are universal machines, gantry, duplex, triplex, rotary and tracer controlled milling machines. But in terms of automation, they can be simple, NC or CNC, and in terms of axial, they can be equipped with two or more than two axes. They can be categorized into either vertically or horizontally. Therefore, it is important to classify and describe them from the specific point of view. At first we describe vertical milling machines and then look into other perspectives:
Vertical milling machines that are widely used in various industries such as mold making, industry, automotive parts manufacturing industry and series making industries are among the most widely used metal working machines. These machines are structurally divided into four general categories; conventional vertical milling machines, NC vertical milling machines and vertical CNC milling machines and gate vertical milling machines.
Some people ask questions about difference between vertical milling machines and horizontal milling machines and their functional advantages. In short, we say that in the vertical milling machines, the spindles of the machines are horizontal and their tables are in the direction or orientation of the ground. For simple understanding, vertical milling machines can be compared to column drills, but in the horizontal milling machines, the spindles are in the horizontal orientation. Vertical milling machines are more widely used and expensive than vertical milling machines.
Important affairs in the vertical CNC milling machines
When buying a vertical CNC milling machine, there are some important points that should be considered and neglecting them cause undesirable results. But what should we really consider when buying? This is a question that many potential customers ask themselves or experts. Some of these are related to the dimensions of the table, tolerance accuracy, ball screw, PLC, chassis or body, and others relate to the features of these vertical milling machines - such as magazine, number of axles, spindle speed, machine control system, the output chip system and the output ports. Of course, there are more other affairs to be considered, such as "brand”, country of manufacturer and costs. In this section, Factorneed experts have summarized the important affairs below and provided brief explanations for each:
Chassis or body structure
Brand of servo motors, spindle motors and other parts
Maximum spindle speed
Maximum speed of each axis
Material of linear guides
Lubrication system
Number of tools in magazine
Portable Electronic Hand Wheel Controller
Coolant tank capacity
It is very important what kind of chassis the device is made of, whether it is one piece, two pieces or several pieces. The best chassis structure of the milling machines is that it is one piece and it is better that the chassis is made of die-cast steel.
As mentioned above, the three-axis motion - in three-axis milling machines - is created from the servo motor, and the rotational motion of the spindle is rotated by a powerful and reliable motor. So their brand is very, very important. Brands such as Siemens, DAS Panasonic, ABB, Heidenhain are well-known brands in this field. It is worth mentioning that the brands of pneumatic and hydraulic parts - in clamping - the brand of electronic and electrical parts is also important.
One of the key parameters that should be considered in milling machines when purchasing- especially for mold makers and those who want to produce all kinds of molds with a milling machine is speed of spindle. For example, if maximum speed of a spindle of a milling machine is around 10,000 rpm, in this respect, the milling machine is suitable.
Milling machines can be manufactured in three-axis or multi-axis, and normally the speeds of all axes are not the same. Axis X is the highest speed and other axes have different speeds. For example, in a relatively ordinary CNC milling machine, the speeds of their axes are in these range:
X-axis = 80 meters per minute. W and Z axis = 60 meters per minute and other axes between 35 to 45 meters per minute
Axis speed can have a significant impact on the production capacity per hour.
Due to the movement of the supports on the linear guides and the sprinkling coolant or oil or even water on the linear guides, the material should be stainless steel or have a stainless steel cover. Some famous linear guide manufacturers are TUSK , DELTRON, VELMEX, ABBA and TBIMOTION.
www.tbimotion.com.twAlthough many milling machines are equipped with an automatic lubrication system, make sure that the system is equipped with a central automatic lubrication system.
The number of tools a magazine can accommodate and hold is a key factor and the tool change system is also an important parameter that should be considered in serial production. The more efficient, the faster the production.
If the vertical milling machine is equipped with an electronic hand wheel system, it can be considered useful in some processes. Of course we have to say this is an option for milling machines.
The larger the capacity of the coolant tank, the less time it takes to recharge it. Normally, the capacity of coolant tanks is 50 to 100 liters.
