What are the layout forms of gantry machine tools

The main ones are as follows:

1--Gantry fixed type (workbench moving), also called static beam type;

2--gantry mobile type (fixed workbench), also known as moving beam type;

3--Full motion type (gantry beam and worktable can perform feeding).

4--Double girder type (two gantry girders).

In addition, there is also a set of Y-axis and Z-axis vertical beams arranged on the side of the multi-axis linkage.

Gantry machine tool refers to the machine tool that runs the workbench and reciprocates between the two columns, which are called gantry machine tools, including gantry milling, gantry planer, gantry guide rail grinding and other large machine tools.

The main difference between a gantry milling machine and a gantry machining center is that the machining center is equipped with a tool magazine that can automatically change tools. Gantry milling (ordinary gantry milling, CNC gantry milling) requires manual tool change.

The difference between a machining center and a CNC machine tool is this, and it has nothing to do with machining accuracy, processing range, processing capacity, processing object, etc.

Gantry milling machine has ordinary gantry milling machine and CNC gantry milling machine. Not to mention the ordinary ones, the general accuracy is poor and the efficiency is low, but after the side milling head is configured, for some special-purpose workpieces, it can have high processing efficiency! The biggest difference between CNC gantry milling machine and gantry machining center is that the former is not equipped with a tool magazine, and the latter is equipped with a tool magazine.

In this way, the tool can be changed automatically when the latter is processed. It stands to reason that the accuracy of the machining center should be higher than that of the milling machine, but now everyone has blurred this concept, anyway, they use ISO230 or VDA standards for accuracy acceptance.

There is no difference in the processing object, but it is suitable for the processing of large workpieces, such as large sheet metal parts and box parts, as well as molds. Generally speaking, the gantry machine tool should be equipped with the corresponding accessory milling head, otherwise the application range of the gantry machine tool will be limited.

The functionality is pretty much the same, it's just a matter of accuracy. It depends on what precision you want.

The functionality is pretty much the same, it's just a matter of accuracy. It depends on what precision you want, there is no difference in the processing object, it is for the processing of large workpieces, suitable for the processing of large sheet metal parts or box parts, as well as molds.

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The structure of the gantry machining center is as follows:

1. The workbench --- the workbench of the gantry machining center is basically rectangular. Worktables, beds, columns, beams and rams and other large castings are made of Meehanite cast iron, and the inner cavity of the castings is a honeycomb composite arrangement structure, with advanced design, all of which have undergone aging and secondary tempering treatment, eliminating residual internal stress, making the material stable, and ensuring the stability of the workpiece machining accuracy and the life of the machine tool.

2. Gantry--- The gantry is composed of a beam and two columns. It is divided into three types: fixed beam, sectional lifting of the beam locked by the positioning block and arbitrary lifting of the beam.

3. Ram --- ram can be divided into two types in terms of structure: open and closed. The ram of the open structure is clamped on the headstock by the pressure plate, and the cross-sectional area of the ram is large; The ram of the closed structure is clamped in the headstock and the ram has a small cross-sectional area.

4. The basic types of tool magazine --- tool magazine are three types: turret type, wheel drum type and chain length type.

5. The processing of large and complex parts --- attachment head library usually requires a lot of attachment heads. The accessory head is specially designed according to the processing requirements of the workpiece, which is generally divided into right-angle head, extended head, special angle head and universal head.

6. The numerical control system --- the numerical control system generally adopts SINUMERIK840C and 840D of the German Siemens company or the series of CNC axes of the Japanese FANUC company adopts full closed-loop control.

7. Accuracy--- The accuracy of the machine tool refers to the original accuracy of the machine tool under the condition that it is not subject to external load. Accuracy is usually expressed as the deviation from the ideal state (referred to as error) on its opposite, and the smaller the error, the higher the accuracy.

There are two kinds of milling machines, one is gantry type and the other is column type.

The so-called gantry type means that the structure is leapfrogging, generally the XZ axis is on the top, and the Y axis is the workbench below.

The xy of the column type constitutes the workbench, and the Z-axis is on the column.

Combined machine tools generally adopt multi-axis, multi-tool, multi-process, multi-face or multi-station simultaneous processing, and the production efficiency is several times to dozens of times higher than that of general machine tools. Since common parts have been standardized and serialized, they can be flexibly configured as needed, which can shorten the design and manufacturing cycle. Therefore, the combined machine tool has the advantages of low cost and high efficiency, and is widely used in mass and mass production, and can be used to form an automatic production line.

Combination machine tools are generally used to process box or special shape parts. During machining, the workpiece generally does not rotate, and the rotary motion of the tool and the relative feed movement of the tool and the workpiece are used to realize drilling, reaming, countersinking, reaming, boring, milling plane, cutting internal and external threads, and processing of outer circle and end face. Some combined machine tools use turning heads to clamp the workpiece to rotate it, and the tool is used for feed movement, and the outer circle and end face processing of some rotary body parts (such as flywheels, automobile rear axle half shafts, etc.) can also be realized.