| 摘要 |
1,269,229. Cooling cutting tools. R. D. ZERKLE, and N. P. JEFFRIES. 3 April, 1969 [4 April, 1968], No. 17083/69. Headings B3C, B3K and B3T. In a method of cooling a cutting tool, the tool is provided with a cavity or passage therein which extends to a heat transfer surface region in close proximity to the cutting edge and through which cooling liquid is passed at a rate which permits the liquid to vaporize on the surface region close to the cutting edge and to condense on contact with another part of the cutting tool cavity or by passing to the atmosphere. The cavity or passage is provided with means which promotes a capillary acting whereby coolant is fed along the passage. In the embodiment shown in Figs. 1 to 3 the cavity 50 is lined with a capillary means 62 in the form of a stainless steel mesh in the form of a tube, the outer end 62B of which is immersed in a container of cooling liquid. Fig. 4 shows a cutting tool having an enclosed cavity 94 lined with a mesh 100 and wherein vapour produced in the cavity near the cutting edge 82 is condensed by spray cooling 106 at the opposite end 104 of the tool. Figs. 5 and 6 (not shown) are modifications of the embodiment shown in Fig. 4 and in which the cavity is opened to atmosphere. Further embodiments in Figs. 7 and 8 (not shown) are similar to that shown in Fig. 1 but includes means for supplying cooling liquid to the tool by a dropper to the capillary mesh lining the cavity. |
