Nozzle for liquid coolant in a machine tool

A nozzle for liquid coolant in a machine tool in the form of an annular or polygonal frame-like nozzle for liquid coolant disposed above a machining tool, connected to a vertical main shaft such that the nozzle is coaxial with said main shaft and directed downward, comprising;

• a) an inner peripheral wall,
• b) an inner flange for inside channel support comprising a corridor block for allowing a liquid coolant flowing in through an inlet port formed directly in or close to said inner peripheral wall to flow substantially radially, an intermediate peripheral wall extending upright from the outer edge of said corridor block so as to cause the radially flowing liquid to turn around inward, and a turnaround top plate having an inner peripheral edge opposed to the periphery of said inner peripheral wall to define an opening to allow said inwardly turned-around flowing liquid to flow out upward through said opening along said inner peripheral wall,
• c) an upper framework which comprises a ceiling formed above said top plate to serve as a guide surface for allowing the liquid coolant flowing out upward through said opening to flow in a planar radial manner, and an outer peripheral wall serving as an outside guide surface for downwardly bending said planar radial flowing liquid to allow the latter to flow downward around the periphery of said flange, and which cooperates with the outer wall surface of said flange to define an outside channel, wherein the wall surface which forms the outside channel is formed in at least one place thereon with a flow agitating recess or a ridge/recess combination, and
• d) a lower framework which includes outer and inner peripheral edges connected to the lower end of said outer peripheral wall positioned below said inner flange, and at least one level difference present intermediate between said inner and outer peripheral edges, and which forms a flow guide floor by which the liquid coolant reaching the lower end of said outer peripheral wall is guided radially inward through said level difference,
• e) the arrangement being such that the liquid coolant is allowed to flow downward with the inner peripheral edge of said flow guide floor defining a circulatory waterfall opening, thereby forming a cylindrical or downwardly tapering conical waterfall-like liquid coolant veil surrounding said cutter.