Large do-it-yourself CNC portal milling machine. Portal Milling Machine CNC Portal Milling Machine

Portal milling machine optimal for working with especially large parts, whose dimensions exceed 3x2 meters. The portal CNC machine differs from its classical counterpart primarily in the presence of numerical control, displacement sensors, tilt sensors, as well as rotation speeds, which allows you to achieve greater productivity in the process. In addition, often the control system controls one universal spindle head, which copes with all operations; the spindle in such machines often has the function of turning and tilting, which adds 2 additional axes to the X, Y, Z axes. Using one spindle head can reduce all operations to one technological program, which can be transferred for execution to the numerical control system of the machine.

Milling machines with a classical design have a single-cantilever structure of the machine frame, as a result of which such machines have some limitations in terms of dimensions, as well as the weight of the workpiece being processed; often the maximum allowable size is from 2 to 3 meters, and the weight is up to 3 tons. For processing large parts, a gantry frame design is required.

The design of the portal is based on two columns, on which the edges of the horizontal beam are fixed. The spindle head, together with the vertically located spindle, moves along the guides of the cross beam. In order to speed up processing, you can use not only one spindle, but several; for example, side consoles can have one spindle each.

In the case of single console machines, the movement of the object occurs in three directions (along the X, Y, Z axes), caused by the movement of the desktop. A portal milling machine allows you to move the table exclusively along the X axis. Quite often, experienced designers use a device with a fixed table, which is fixed in the foundation, for processing very large workpieces. In such a machine, the movement along the X axis is due to the portal, which is movable relative to the desktop and the ground.

Regardless of whether the machine has a movable table or portal, the processing of large workpieces requires a high load mode for the main spindle. Also, movements along the axes of the machine cause great efforts aimed at overcoming deformation and friction forces during operation. Therefore, if you want to ensure high machining accuracy, be prepared to perform a number of tasks that increase the overall rigidity of the machine structure, reduce friction and wear of structural parts that cool the machine during operation, etc.; specific list necessary work depends on the machine model.

Each machine in the DARXTON product catalog is distinguished by high-quality assembly and materials, which guarantees reliable operation and a long service life. The DARXTON online store offers to buy a portal CNC machine at the most favorable price on Russian market. The company is engaged in the supply of exclusively high-quality machines and components. The company's specialists check each machine before shipment to the buyer, the company bears all service obligations after the purchase of the goods.

* Prices for machines are indicated without VAT, including delivery to the buyer's factory, including installation supervision

Gantry vertical milling centers GR series

The HAAS gantry series includes 2 models: GR-510 and GR-712. Movement along the X, Y and Z axes for the gantry milling machine GR-510 is 3073x1549x279 mm, for the GR-712 machine it is 3683x2159x279 mm. Optionally, it is possible to increase the Z-axis travel up to 610 mm.

Work zone

The working table with a heavy workpiece remains stationary during the operation of the machine. The spindle with the cutting tool moves along the X, Y and Z axes. The portal has O-shape which adds rigidity and reliability to the machine. In the basic configuration, the machines have a protective fence working area which protects the operator and his workplace from chips and coolant.

Also included in the basic package of machines:

• automatic tool changer for 10 positions;
• 8100 rpm spindle with 40 taper;
• aluminum table with a grid of threaded holes;
• CNC system with 15″ color screen and USB port.

As options for these machines are available:

• automatic tool changer for 20 positions;
• 15,000 rpm spindle with 40 taper;
• steel table with a grid of threaded holes;
• 4th axis control drive for working with rotary tables;
• a system of measuring wireless probes for binding the tool and the workpiece;
• increase in clearance along the Z axis by 152 mm;
• coolant supply system, etc.

Demonstration of the work of the portal milling machine with CNC GR-712

Comparison of CNC vertical milling gantry machining centers

What does Abamet offer and how to place an order

The Abamet company can offer not only a machine tool, but also a cutting tool, technological and tool equipment, coolant, i.e. everything necessary for its successful work. Tools, equipment, coolant are selected based on the technological study of the received technical assignment. Our service department provides comprehensive operational support and high-quality warranty and post-warranty service.

To make a request for a CNC portal milling machine, please contact us by toll-free contact number 8-800-333-0-222 or send an application with terms of reference to the email address info@site. You can also make a request using the forms feedback on our website or by contacting the representative office of Abamet in your region.

Often there is a need for milling large-sized workpieces (for example, body parts of machines and units). Such blanks, in addition to large sizes, also have a large mass, which makes their processing difficult. Portal milling machining centers are best suited for this kind of work. Gantry milling centers are available with sliding table and moving columns. Using the design of the machine with movable columns allows you to process larger workpieces with a smaller machining center.

Portal milling machining centers with movable columns are used for processing long and large workpieces. The traditional layout of such machines includes a fixed table and a longitudinally movable portal carrying a traverse with a transversely vertically movable headstock. Thus, the movement of the tool along the X axis is carried out due to the movement of the portal along the desktop, the movement of the tool along the Y axis is carried out due to the movement of the traverse with the spindle along the portal in the horizontal plane, the movement of the tool along the Z axis is carried out due to the movement of the spindle along its vertical axis.

On portal milling machining centers, the following types of work are performed: milling, boring, countersinking, drilling, cutting internal and external threads, trimming ends. To perform all these types of work without readjusting the machine, it is usually equipped with a large belt-type tool magazine. Tool change is usually carried out by a rotating traverse, which reduces the tool change time and, ultimately, reduces the processing cycle.

The DEG Group of Companies supplies the Russian and CIS markets with high-precision portal milling machining centers from DMC (Korea), carries out commissioning and post-warranty service maintenance equipment.

The full range of milling machines is in the corresponding section

Portal CNC milling machine is a high-tech equipment designed to perform tasks such as drilling, embossing and planar milling, engraving. To do this, you need to create a drawing in a special editor, upload it to the control module of the machine, after which the machine itself will perform all the necessary actions. you can process wood, metal, plastic, stone and some other materials.

Advantages of CNC machines

CNC gantry machines are able to quickly perform high-precision milling work, while they do not require the participation of more labor. One operator can serve several machines at the same time. Its task, usually, is to secure (remove) the workpiece and start the control program.

The use of a CNC portal milling machine in production can significantly reduce the time spent on the product manufacturing cycle, in comparison with the same process on conventional equipment requiring the involvement of qualified personnel.

Acquisition of a milling machine with a numerical program management will cost the company less than the purchase of several conventional machines.

The speed of production of products and its quality will be higher. It will be possible to produce a wider range of products and save on the wages of qualified personnel, which will make it possible to recoup the funds spent on equipment in a short time.

Varieties and scope

Milling portal CNC machines differ in functionality and scope. Some devices are designed to perform a wide range of tasks. For example, engraving and milling portal machines can produce products from various kinds of materials: from hard alloys to foam. It can be 2D or 3D processing, of varying degrees of accuracy and detail. At the same time, milling machines can only be processed.

Portal CNC machines of industrial type

This is the most expensive and often large-sized equipment, which is largely offset by its reliability and functionality. Operation in industrial environment puts forward a number of requirements for CNC machines. Uninterrupted operation to failure for a long time, under high loads, accuracy, the ability to process large parts. In addition, such devices are equipped with all possible equipment, such as vacuum tables, water cooling systems for the spindle and tool changers. The control of industrial CNC equipment is implemented in the form of separate consoles, on which advanced software is usually installed.

CNC machines for small businesses

It's next for industrial look portal machines with numerical control, which does not always mean their lower functionality or performance relative to their older counterparts. They are made according to the same principles and often with the same components.

Differences can be primarily in size and equipment. The package includes the essentials, there can be no talk of any carousel cutting tool change systems, unless, of course, the device was purchased for tasks that require such a function. The operation of the device is often controlled by a computer via the LTP port or by using adapters connected to USB or LAN.

Medium CNC routers are popular in small businesses, among individual entrepreneurs and for private use. They are used for milling wood and MDF in carpentry or furniture production, production of monuments (stone engraving), promotional products, seals. The purchase of large expensive CNC units for such needs is not justified and will bring losses rather than profit.

Multi-axis CNC machines

For a CNC router, at least three axes are required: two for positioning on a plane and one for moving the spindle with a cutting tool in a vertical direction. Such functionality allows the machine to process a part in the so-called 2.5D format. This implies a relief study of the plane, without milling the internal sections of the part.

On a portal milling machine, the fourth axis is usually a lathe chuck attached to the surface of the desktop. The workpiece is clamped into it, and processing occurs by rotating the part and moving the spindle along it. This method is often used in the manufacture of balusters for stairs. However, it is erroneous to consider the lathe chuck as the fourth axis, because in most cases it is connected to the controller, which previously controlled one of the planar axes (most often X). Chuck rotation simulates movement along this axis.

Milling processing of full-fledged 3D objects is possible if the CNC has 5 axes. Such devices are used for the manufacture of models, decorative models, sculptures.

There are CNC routers with multiple (2 or more) spindles. Such solutions help speed up the production of identical parts.

Homemade equipment

The project and drawings for such devices are made independently. The design, as a rule, is tried to be made according to the simplest possible scheme. In the manufacture, improvised means are used (for example, stepper motors from DVD players). Part of the nodes can be made to order, something can be bought online.

Design features

The portal design of CNC machines implies the presence of a U-shaped portal. Its movement along the work plane provides processing of the part along the Y axis. Along the X axis, the part is processed by moving the spindle along the portal beam.

CNC machines consist of the following elements:

• Bed. It is located under the portal, on it there is a desktop, as well as guides along which the U-shaped structure moves.
• Portal. Moves over the bed. It houses the working units and mechanisms of the CNC machine;
• Stepper motors (servomotors). They set in motion mechanisms that ensure the movement of the processing tool along a given axis;
• Guides. Usually rail or pipe type. Provide accurate rectilinear movement of the moving parts of the machine in a given direction;
• Movement mechanisms. There are two types: ball screw or rack-and-pinion kit. The rotation of stepper motors through these mechanisms is converted into the movement of machine components.
• . Provides rotation of the cutting tool.
• Control system. For full numerical control of the machine , a separate rack is required, with specially designed software. Budget machines can be controlled from a regular PC.

Not all standard layouts of 3-axis milling machining centers are capable of machining long and massive metal workpieces. As a rule, their design does not have enough working space to place and securely base the part without problems. Especially for such non-standard solutions, milling machining centers with the so-called portal structure. They can easily handle workpieces up to 4 meters long and weighing up to 12 tons. Moreover, milling portal machining centers cope with such tasks faster and better, and sometimes at comparable pricing.

Technical parameters and purpose of CNC portal machining centers

The portal milling machine for metal has significant design features. The main unit of the machine is a U-shaped structure of two columns, between which a transverse horizontal beam is fixed, on which the spindle unit is mounted. The spindle head moves along it, with a cutting tool fixed in it. Moreover, the direction of its movement can be both vertical and horizontal movement, and the rotation and inclination of the angular milling head can be carried out in 3, 4 and even 5 coordinates. The number of spindle nodes on one milling portal machine for metal can reach three: one will be placed on the guide beam, and the other two - on the supporting vertical columns holding the guide.

important distinctive feature portal milling machines with CNC is the longitudinal direction of movement of the desktop with a workpiece fixed on it. In this case, the work table moves only in one direction, while the design of standard CNC milling machines provides for a three-axis cross movement. This limitation is caused by a significant mass of workpieces: it is not possible to lift and turn such a workpiece in a minimum period of time, especially if its length reaches several or more meters.

In some cases, which is required by mechanical engineering technology, preference is given to models with a completely fixed table, where the surface treatment of the workpiece is carried out due to the movements of the portal itself relative to the table surface. Multi-axis machines are controlled by a numerical control system (CNC system), which greatly simplifies the operation of the equipment and guarantees stable processing quality.

A serious task that one has to face when processing heavy and oversized workpieces on portal-type milling machines is a significant load on the spindle, as well as the need to overcome frictional forces and vibrations during the milling process. The solution to this problem, in addition to the introduction of forced cooling of the main working bodies, is the increased rigidity of the equipment, which is due to the mass of the machine itself as a whole. All this turns the machining center into a complex engineering system that fully justifies its own need with competent maintenance.

Where to buy CNC portal milling machine?

The KAMI Association catalog contains a wide selection of branded equipment from leading world manufacturers, sold on a quality guarantee basis. Prices for all models are distinguished by their availability, and the manufacturer's warranty by its duration. You can get additional advice on the selection, operation and maintenance of machines from our technical specialists both in person and over the phone.