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Development history of CNC gantry type milling machine

May 21, 2020

The CNC gantry type milling machine includes a bed, a worktable erected on the bed, and a CNC circuit control system. The movable spanning frame above the worktable is provided with a gantry frame. The gantry frame further includes: a gantry frame carriage, which is movably clamped on the X-axis guide rail. Z axis guide rail is installed on the gantry frame. The beam is equipped with a Z-axis carriage, the beam is movably clamped on the Z-axis guide rail by the Z-axis carriage, and the Y-axis guide is also installed on the beam.

Milling device, CNC gantry type milling machine The milling device is movably installed on the Y-axis guide rail, so that the gantry under the control of the numerical control circuit control system, for X, Y, Z three-dimensional three-dimensional milling processing. The CNC gantry type milling machine has high-precision milling, drilling, boring, and cutting operations.

Gantry milling machine is a horizontal milling machine created by American Whitney in 1818; in order to mill the spiral groove of the twist drill, American Brown created the first universal milling machine in 1862, which is the prototype of the lifting table milling machine; around 1884 A gantry milling machine appeared again; a semi-automatic milling machine appeared in the 1920s. The table can use the stopper to complete the automatic conversion of "feed-determining speed" or "determining speed-feed".

Milling machine with portal frame and long horizontal bed. The machining accuracy and productivity of the gantry milling machine are both high, which is suitable for processing the plane and inclined surface of large workpieces in batch and mass production. CNC gantry milling machine can also process space curved surface and some special parts. The gantry milling machine is composed of a column and a top beam to form a portal frame. The beam can move up and down along the guide rails of the two columns. There are 1 to 2 milling heads with vertical spindles on the beam, which can be moved laterally along the beam rail. A milling head with a horizontal main shaft can also be installed on the two uprights separately, which can move up and down along the upright rails. These milling heads can process several surfaces simultaneously. Each milling head has a separate motor, speed change mechanism, operating mechanism and spindle components. During processing, the workpiece is installed on the worktable and longitudinal feed motion is performed accordingly. The total weight of the large gantry milling machine is 850 tons. There are some variants of gantry milling machine to adapt to different processing objects. ①CNC gantry type milling and boring machine: The milling and boring head can be milled and bored on the beam. The spindle can be used for axial motorized feed and has a motion fine adjustment device. The fine adjustment speed can be as low as 5 mm / min. ②Bridge gantry type milling machine: The table and workpiece do not move during processing, but are moved by the gantry. It is characterized by a small footprint, a large carrying capacity, and a gantry frame stroke of up to 20 meters. It is easy to process extra-long or heavy workpieces. The shape is similar to the gantry planer. The difference is that its beam and column are not equipped with a planer knife holder. There is a milling tool holder of the spindle box, and the reciprocating motion of the longitudinal table of the gantry milling machine is not the main motion, but the feed motion, and the rotary motion of the milling cutter is the main motion.

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