Detailed interpretation of bridge gantry processing center

Laojin: Bridge longmen processing center is a new high speed and high precision longmen processing center varieties in recent years, originated from abroad, the current domestic manufacturers are not many. The unscramble of old gold is conceptual, specific performance quantization wants to see the product of each machine tool manufacturer. This article was written by a university teacher and a sales manager of a foreign trade company, thanks for their inspiration.

CNC machine tools have not appeared in the wild, gantry milling machine is mainly used for heavy cutting, precision and smoothness requirements are not high, processing is characterized by large cutting deep slow knife, cutting deep fast forward to the bridge type structure milling machine has no place to use.

To people's taste of life is getting higher and higher today, the pursuit of exquisite beauty even exceeds the requirements of product functions, which requires the accuracy of the machine is getting higher and higher. At the same time, the pressure of production costs hope that the higher the cutting efficiency of machine tools, the more ideal. High precision and high efficiency expectations also fall on the longmen processing center. Bridge gantry processing center emerged at the right moment, the structure of high-speed gantry in foreign countries generally adopts bridge type, domestic users of bridge type recognition is not high resulting in few manufacturers production, mold industry to bridge gantry processing center application is relatively more.

What is bridge gantry processing center? The working table is fixed, and the beam moves on the two viaducts. The machining center is the bridge gantry machining center, also known as the viaduct gantry machining center. Friends think bridge longmen processing center is a moving beam longmen processing center, this is not the correct understanding, moving beam longmen refers to the structure of the beam moving on the column, in fact, bridge longmen processing center is a variant of moving column longmen processing center.

The moving column gantry machining center of the guide rail part of the elevated viaduct, cut off the two columns of the moving column, is not the bridge gantry machining center? Why do is reasonable, the high efficiency demands high-speed movement, the two pillars of truncated dynamic column, after only one beam moving parts, greatly reducing weight, high speed feed became possible, moving parts of lightweight also reduces the ball screw drive load, reduces wear on the ball screw and linear guide, precision is also improved accordingly. The viaduct structure also increases the rigidity of the load-bearing part of the machine tool, which can well avoid the vibration phenomenon prone to occur when the beam moves quickly and the spindle runs at high speed.

Does it look like a viaduct on the left and right?

Saving space is the patent of moving column gantry processing center, this characteristic is also inherited to bridge gantry processing center. Fixed beam gantry machining center of the table is mobile, 2 meters of the table needs 4 meters of the base, double the occupation area. The bridge gantry machining center table is fixed, the workpiece does not move, 2 meters of the workpiece can be placed on 2 meters of the workbench and base processing. The table does not move also let the bearing capacity of moving column and bridge gantry machining center is much larger, in theory, as long as the weight of the workpiece does not collapse the table can bear. The bearing capacity of fixed beam gantry machining center mainly depends on the support of two guide rails. Traditionally, the unloading structure is used to enhance the bearing capacity of the table, but it is still far from the natural power of bridge gantry.

Changes in structure and performance have correspondingly increased manufacturing difficulties. It is difficult to guarantee the parallelism between the guide plane and the workbench platform of the two viaducts, and the distance between the three planes is very far, so it is difficult to manufacture and debug. Moving beam gantry machining center table drive is a single ball screw, servo motor, driving is very smooth, and bridge gantry machining center beam X to mobile need double ball screw and double servo motor drive, synchronization of two servo motors, two ball screw assembly parallelism is a difficult problem, personally think that using linear motor can replace screw and servo motor, Assembly difficulty will be reduced.

Bridge gantry processing center is definitely not perfect model, one thing always has its two sides. Bridge gantry processing center although can carry the behemoth, but because the weight of the beam itself is relatively light (conventional gantry beam and dragon door frame as one, since the major), the bending ability of the beam, the torsion stiffness is weak, the amount of knife can not be too large, that is, the cutting depth can not be too large. Say a popular point, the high rigidity of bridge gantry is reflected in the bearing part, the rigidity of the moving part is weaker than the conventional gantry. In addition, the viaduct will block the operator's line of sight, preventing the installation of workpiece, tool, adjustment and other operational actions, the ideal method is to install tools on the tool instrument, workpiece measuring instrument and other online measurement equipment to eliminate the impact. The viaduct will also cause some inconvenience to the hoisting of large workpieces.

The correct way to use bridge gantry machining center is to cut deep or small cut deep, high speed, fast feed, so as to reflect its efficient hero.

You have to make the decision you need, bridge gantry processing center waiting for the people who need it.