| 摘要 |
801,947. Machine-tool details. DECKEL, H., and DECKEL, F. W. June 29, 1956 [Sept. 1, 1955 ; Feb. 10, 1956], No. 20157/56. Class 83 (3). [Also in Group XXIII] Means for eliminating the effects of temperature-variation on the position of the tool in a drilling &c. machine, comprises an expansion-bar 12 linking the tool-support 9 to the machine-frame 1, the end 13 of the bar towards the tool-spindle being fixed to the frame 1 and the other end 14 to the support 9. An expansion-bar 12 may be provided at both sides of the support 9, Fig. 1. The bars 12, being shorter in length than the support 9, are of a material having a higher coefficient of thermalexpansion than that of the material of the support 9 and frame 1, so that the position of the tool relatively to the work 4 on a compoundtable 2 remains unchanged by thermal expansion of the support and of the frame. The tool may be carried in a head 11 angularly adjustable on the support 9. In a modification, Fig. 3, a single expansion-bar 20 is used, being keyed at one end 21 to the frame 1 and at the other 23 to the support 9. A driving-gear 32 for the tool-spindle may rotate on the bar between a pair of guide-bars 25, Fig. 4, mounted on the support 9 and engaged in passages 26 in the frame. A third guide-bar may be provided, and the top 24 of the support may be dove-tailed into the lower part to facilitate the use of different tools. Instead of the support being mounted in guide surfaces on the frame 1, it may be supported out of contact with the frame on broad leaf-springs 112, Fig. 7, attached at one end to the support and at the other to the frame. In modifications of this embodiment, Figs. 9-11 (not shown), the exposed length of the leaf-springs may be reduced and they may be formed with enlarged ends to facilitate attachment. |
