CNC portal machines include machines that have a portal design, that is, the presence of two vertical racks connected by a cross member.

The table of such a machine moves between the columns in only one direction (back and forth) or the table does not move (stationary), but the portal rack moves along the table.

With a tool magazine, a CNC portal machine is classified as a machining center.

Equipment Features

Gantry milling centers usually have a single spindle on which a tool or spindle head is mounted to allow for automatic tool change and ease of operation. In addition to the tool magazine, portal OTs, as a rule, have an additional magazine of heads, the change of which is also carried out automatically according to the program.

Portal OTs can be in pallet design - with automatic pallet change. Also, portal OCs have a chip conveyor and can have a cabinet fence of the working area to prevent splashing of chips and coolant during processing.

Gantry machining centers are capable of performing an extended range of workpiece processing operations (milling, drilling, threading, boring and other operations), including simultaneous processing along 5 axes

Modern equipment manufacturers are trying to take into account the needs modern industry. For example, our partner from Taiwan, KEN ICHI, develops high-speed and power portal OCs for specific tasks in the aircraft and space industries.

Selection options:

Before you buy a CNC portal machine, you need to decide on the following parameters:

• workpiece dimensions
• workpiece material
• the required level of processing accuracy;
• degree of production automation;
• production volumes.

Why "Pumori-engineering invest"

The Pumori-engineering invest company is the exclusive supplier in the Russian Federation of high-performance high-tech portal machining centers of the Japanese company Okuma and the Taiwanese manufacturer KEN ICHI. The cost of each machine includes delivery to any point in Russia, commissioning, personnel training, as well as warranty service. Post-warranty service is carried out under a separate agreement.

We also conduct technical audits and develop projects for technical re-equipment and modernization of production, provide service and warranty maintenance of equipment, perform metalworking outsourcing on our own high-precision equipment of Okuma, Manurhin (France) in Yekaterinburg.

Our managers will help you choose a machine, make calculations, conduct technical advice and provide information on the terms of leasing - leave a request through the form feedback, email or call.

• FD Series Fixed Gantry Double Column Gantry Machine
• Massive cast-iron construction of the machine allows maximum absorption of vibrations during high-energy processing
• The rigidity of the frame structure, consisting of a massive frame, two columns and a powerful cross, allows you to achieve high positioning stability and power during machining

bed- this is the main bearing unit of the machine, which serves for the installation of parts and assemblies of the machine; relative to it, moving parts and assemblies are oriented and moved.

The bed is a massive structure made of modified cast iron. Box-in-box construction is used to give the frame structure and vertical columns maximum strength.

This design allows these elements to be 50% stiffer than competitors and provides increased stability and load capacity.

The same design is used in the manufacture of the portal and the carriage, which provides a strong support for the headstock when processing heavy and large parts.

To achieve the best surface accuracy and rigidity of the entire structure, the mating surfaces of the bed base, columns and portal are scraped by hand.

Ball screws (ball screws) accuracy class C3 are used to increase the speed and accuracy of movements.

Drive screws have high rigidity, combined with high running smoothness and accuracy, which ensures maximum machining quality. In screws of this class, the nut does not have direct contact with the screw. It does not slide on it, and balls roll between the screw and the nut (as well as in a ball bearing). That is, sliding is replaced by rolling, which at the same time significantly reduces friction (more than 100 times). The special heat treatment of the ball screws and the absence of slip significantly increase the working life of the pair. Transmissions of this type do not need frequent additional service and adjustment, and with proper operation and timely lubrication, they retain their high performance throughout the entire life of the machine.

The table shows the dependence of the accuracy class of the ball screw and the axial clearance (backlash) in microns.

This series of machines are used linear (Linear Way) guides.

Linear guides (LNC) are made in the form of a prismatic guide along which one or more carriages move with the help of ball (ball linear guides) or roller (roller linear guides) rolling elements circulating in the cage. The linear guide is made separately and attached to the base of the machine. Such guides implement rolling friction. Friction losses in the LNC are the sum of losses caused by the friction of the rolling elements against the cage and losses proportional to the load.

Roller guides are used in FD series machines, since their load capacity is much higher than that of ball guides with equal cross-sectional dimensions (see diagram).

The dynamic load capacity of the carriage varies from 27.7 kN to 275.3 kN, the static load capacity - from 57.1 kN to 572.7 kN.

Linear guide carriages provide high-precision movement (deviations in the travel geometry - within 5 microns) and positioning of the tool relative to the workpiece.

In carriages of this type, four rows of rollers are placed at an angle of 45º, so they equally perceive the load both in the radial and longitudinal directions.

Typically, a linear guide has a negative clearance (preload) between the raceway and the rollers, which is required to increase the rigidity of the assembly or improve its rotational accuracy. The use of preload reduces the noise level during operation, compensates for wear and tear of the rollers during operation.

Carriages of this type have large dimensions (up to 300 mm long and 120 mm wide) and reach a weight of 11 kg.

Spindle extremely balanced and has extremely high static and dynamic rigidity. The spindle is installed in a rigid cast housing, which eliminates the presence of vibrations and increases the accuracy of processing.

In the FD series, the headstock has an optimal proportion of 1:1.25. This design reduces the overall weight of the headstock while allowing the spindle to penetrate deeper into the workpiece.

In the basic configuration, an additional spindle oil cooling, which ensures a uniform distribution of temperatures, and, accordingly, resistance to overheating, preventing thermal deformation. This internal cooling system allows smoother precision machining.

Coolant cooler installation(option) used for stabilization temperature regimes operation of tools and equipment, allows you to effectively cool the circulating coolant, which ensures the operation of the spindle at a constant temperature and maintains machining accuracy for a longer time.

It is possible to optionally use a spindle with internal coolant supply.

Coolant from the inside cools the entire spindle, tool, insert and workpiece.

High-pressure coolant supply (up to 20 bar) directly into the cutting zone contributes to the formation of smaller segmental chips and allows the tool to be used for deep drilling operations and milling of complex contour surfaces.

The machines of this series are equipped 2-speed ZF gearbox(Germany) with a gear ratio of 1:4 (increases the torque by 4 times), allowing you to transfer maximum power at a spindle speed range of 208-2500 rpm. Maximum torque 660N×m.

The gear wheels of the ZF gearbox are made of high quality steels, finely ground and rolled, hardened and stress-resistant to high loads, with a hardness of HRC 55-60.

The gear train provides high stability, it is capable of transmitting high powers and has a relatively small size.

Spindle gearbox provides high and low speed range: high speed range for high speed machining; low speed range provides high torque for heavy cutting.

The graph shows the dependence of spindle power and torque depending on the engine model.

For faster and better chip removal from the working area, the machine is equipped as standard with 2 chip conveyors screw type and one belt conveyor.

The working chamber of the screw conveyor is a hollow cylinder, inside which a screw (auger) is installed, based on bearing assemblies.

The performance of the screw conveyor depends on the diameter, pitch and speed of the screw.

Chips from the screw conveyors enter the linear conveyor and are discharged into a special tank.

The presence of chip conveyors reduces equipment downtime, greatly facilitates the process Maintenance and machine cleaning.

Tool magazine- device for automatic tool changer. As standard, the magazine is designed for 24 tools.

A tool magazine with a manipulator is located outside the working area.

The tool change process begins with the spindle moving along the Y and Z axes to a certain extreme position, and the tool change itself is carried out using a 2-arm manipulator.

The tool magazine and the headstock of the machine are in a stationary state, which significantly reduces the time for changing tools.

Inductive sensors monitor the presence of the tool and the correct position of the tool holder in the socket.

The tool magazine is separated from the working area by a partition (casing) made of stainless material. This protects the tools and tool changer from dirt.

As an additional option, it is possible to install 32, 40, 60, 80 and 120-station tool magazines.

Oil separator- this is a device for separating the lubricant from the coolant circulating inside the machine.

To clean the cutting fluid, coolant filters are used, which remove microparticles from it after machining.

An oil separator is used to increase the life of these filters, but at the same time contributes to the deterioration of lubrication due to a decrease in the percentage of lubricant in the coolant.

Usage automatic workpiece measuring device(option) provides high locating accuracy, reduces the time for installation and locating the part.

This device allows you to set the part with reference to the CNC of the machine, allows you to measure the dimensions of the workpiece in the process of processing it and to control the parts processed after the machine changeover with automatic updating of the tool offset.

Contact measurements make it possible to dispense with the use of expensive clamping devices and the lengthy procedure for setting the workpiece relative to the machine axes manually using dial indicators. The use of measuring sensors installed in the machine spindle offers the following advantages:

• reduction of machine downtime;
• automation of workpiece mounting, its alignment with respect to the machine axes and correction of the angular position of the rotary axis;
• decrease in the volume of marriage;
• increased productivity and versatility in relation to the volume of a series of machined parts.

Tool measuring device Tool Laser Probe NC4 or Tool Probe TS27R (option)

The tool setting system allows you to measure the size of the tool before cutting and check for damage or breakage of the tool during processing on the machine.

The procedure for using plane-parallel gauge blocks and entering corrections in manual mode take a lot of time and are highly influenced by the human factor. Meanwhile, tool setting probes are easy to install on CNC machines and automate tool setting. This provides the following benefits:

• significant time savings and reduced machine downtime;
• high accuracy of measuring the length and diameter of the tool;
• automation of calculation and input of tool offsets;
• no errors associated with inaccurate actions of the operator;
• detection of tool breakage directly in the process of manufacturing the part;
• decline in marriage.

It is STAN LLC.

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The main processing unit of portal milling equipment is a U-shaped structure, consisting of two vertical columns and a horizontal beam with a fixed spindle. A spindle head moves along it, to which a cutting tool is attached.

Unlike a conventional milling machine, in a portal mill the spindle head can move in any direction. On different models, from one to three such devices are installed. The part can be processed simultaneously from above and from both sides, which greatly speeds up the milling process.

Unlike conventional three-coordinate machines, in the portal machine the frame moves in only one direction. This feature is due to the large size and weight of the workpieces being processed. There are models with a fixed table, on which the spindle assembly with a fixed tool moves.

Despite the solid dimensions of the workpieces, milling does not take much time. The spindle rotates at a speed of 7000-20000 rpm, quickly processing the part.

This technique can withstand loads up to 2.5 t / m², allowing you to work with workpieces from any metals and alloys.

Due to its massive milling machines portal type excellent vibration damping. For additional stability, machine components are filled with a special vibration damping agent. The spindle is protected from overheating by a specially designed cooling system. Therefore, the equipment lasts a long time.

Benefits of KMT CNC Gantry Machining Centers

• Our company supplies Chinese equipment, the price of which is much lower than European or Japanese models. This reduces the financial burden on the buyer. If necessary, the goods can be leased.
• The equipment has a self-diagnosis function - in case of a malfunction, the machine displays an error message, so that a lot of time is not spent on troubleshooting.
• The control program has a user-friendly interface, which facilitates the work of maintenance personnel. There is a recording function, so the downloaded operations can be saved so that they can be repeated again if necessary.
• The proposed equipment has high speed work, allowing you to quickly produce a large batch of parts. Since the equipment is controlled by a program, breakdowns and defects caused by the human factor are practically excluded during operation.
• Service maintenance of the purchased milling equipment will not be a problem. A wide network of centers allows you to quickly purchase a worn part and replace it in case of breakage. There you can buy all the necessary consumables.

Our company will install, debug the purchased portal milling center and train staff to operate it. In the future, warranty and post-warranty service will be carried out.

What is a portal machining center. The relevance of the use of machine tools in industry. Advantages and scope of operation of the units.

Gantry Machining Center

In industry, there is a need to use high-tech equipment, which is both reliable and fast in operations. Models manufactured in accordance with global trends in machine tool building win. A popular option is portal machining center which has a wide range of applications.

The purpose of the equipment is to process large-sized parts in various industries industry. Namely:

1. Instrumental. In this case, stamps and molds are processed.
2. Chemical. Tube sheets of heat exchangers, flanges and plugs with a large diameter, body elements must be adjusted to the established parameters.
3. Engineering. Various parts, covers, plates are used for processing.
4. Machine-tool. The body parts of the units require additional processing. These are beds, calipers, stocks, racks, etc.

Portal Milling Machining Centers have a special design. The unit includes a number of cast body elements:

• bed;
• racks;
• special headstock;
• table.

For the manufacture of parts, durable cast iron is used, characterized by high degree rigidity and vibration resistance. It is also planned to install other components, in particular, CNC systems, ball screws, electrical automation, bearings. The quality and durability of the elements guarantees the uninterrupted operation of the units over a long period of service.

Benefits of using gantry machines

These machines have a number of advantages. The equipment is distinguished by the following parameters:

1. fast action;
2. resistance to high dynamic loads;
3. powerful drive of the main movement and feeds;
4. maintaining high accuracy and reliability during operation.

Compared to single-column options, the centers are distinguished by the presence of a rigid closed structure. This allows you to achieve high modes of processing large parts. To ensure optimal parameters during operations, special roller guides and sliding guides are used. Such centers are used to perform a number of operations. In particular:

• milling of various surfaces (rectilinear, curvilinear);
• drilling;
• thread cutting;
• boring holes.
• The processing of parts is carried out with the help of a computer program, and the tool change is carried out by a manipulator at the command of the CNC.

Features of the devices

Gantry Machining Center presented to the consumer in several versions. The table on which the workpiece is fixed can be movable or fixed. In the first case, it moves independently, in the second, a portal with processing tools moves along it.

Movable options involve the machining of large metal blanks. Structurally, such models are performed according to the traditional scheme. In this case, the portal is fixed, and the longitudinal table moves inside it. The first one is made in the form of a bearing traverse with a transverse-vertical headstock.

The sizes of tables of the movable type vary, which allows you to choose the most suitable option in accordance with certain parameters. If the unit is equipped with a tool head rotated by 90 degrees, then it becomes possible to process parts of the most complex shape.

The high degree of automation, which is achieved through numerical control, guarantees excellent performance of the devices. CNC Gantry Machining Center minimizes human involvement in the process.

There are models of domestic and foreign manufacturers on the market. In some cases, an appropriate solution would be to purchase. The equipment is not inferior in quality to equipment from world brands, while its cost is acceptable to the consumer.