The invention relates to the field of heavy-
cutting lengthened narrow right-angle heads, and discloses a heavy-
cutting lengthened narrow right-angle head for a C-axis built-in ram, which comprises a spindle box, a spindle, a stand column and an unclamping cylinder
assembly, the lower part of the stand column is a rectangular section, the upper part of the stand column is a revolving body, and the stand column is butted with the C-axis ram of a
machine tool through an end-toothed disc; the spindle box is transversely arranged on one side of the stand column, and a gear pair composed of a
spiral bevel gear shaft and a
spiral bevel gear is arranged in the spindle box to drive the spindle. And the whole carbon
fiber coupling is accommodated in the central through hole of the upright post. The invention provides a heavy
cutting lengthened narrow right-angle head for a C-axis built-in ram, and aims to solve the problems of
slow response and much mechanical seal leakage of a long-distance cooling pipeline, improve the safety, introduce low-pressure clean gas in the middle of a
piston of an unclamping cylinder, mechanically switch on and switch off along with the unclamping action, be independent of the inner cooling pipeline, and do not occupy a sealing floating end. Working is reliable and the structure is compact.