Patent GB-1308512-A (GB)
Title: Machine tool slide assembly
IPC: B23Q1/38
Filed: 1970-03-02
Abstract: 1308512 Machine tool details VYZKUMNY USTAV OBRABECICH STROJU A OBRABENI 2 March 1970 [6 March 1969] 9913/70 Headings B3B B3K and B3T A milling machine, or vertical lathe, slide assembly, comprises a table slidable or rotatable relative to a base, and at least one servomechanism with a vertical displacement sensor fixed to the table or base, for maintaining a constant distance between these two members. In a milling machine, a carriage 4 Fig. 1, forming the base is movable on guides 57, 58, by a lead screw, 19 and a table 6 is movable across the carriage. A templet 5 is pivoted to the carriage at positions 55, 56, and is supported by a spring support 59. The upper surface of carriage 4 has a guideway 11, and the vertical position of table 6 is controlled by servomotors 14, 15, having carriages 18, 19, which cooperate with guideway 11, the servomotors being controlled by signals from vertical deviation sensors 12, 13, which are connected to the servomotors through amplifiers 16, 17. In a vertical lathe Fig. 2, rotary table 22 has a templet 21 formed thereon, which co-operates with vertical deviation sensors 24, 25, which are connected to vertical position correcting servomotors 27, 28, via amplifiers 44, 45. A second templet 33 is pivoted to the cross rail 32 at positions 125, 126, and is spring-supported at points 42, 43. Vertical deviation sensors 34, 35, which co-operate with templet 33 control servomotors 36, 37, via amplifiers 46, 47, so that a required vertical position of tool head 40 is maintained. If the vertical position of cross rail 32 is fixed, templet 33 is secured to fixed holders 48, 49. If however the vertical position of the cross rail is adjustable, the templet 32 is fixed to the cross rail, and the vertical position of the latter is measured by a device 51 connected to the cross rail by a rack and pinion drive 50. In a modification, part 60 Fig. 3 moves on guide 61, the templet 63 being connected to guide 61 by a holder 84, and the servomotors 70, 71, being actuated so as to maintain the required vertical position of part 60, by a slide valve 66 actuated by the templet 63. Block 620 and its piston 71, may be omitted, or the upper piston 70 with its accessories may be omitted. Part (220), Fig. 4 (not shown), has its position maintained in two directions perpendicular to each other, by two sets of servomotors (136, 138) and (135, 137) each set being controlled by a different slide valve (229), (130). The arrangement of Fig. 4 may form one of a number of such arrangements connected together, the slide valves of Fig. 4 controlling the other servomotors. In a further modification of Fig. 3, a locking slide valve (321), Fig. 5 (not shown), is provided, this valve being controlled by a magnet (324), so that when the magnet is energized, the valve is moved to supply fluid between the faces of the servomotors and member (90), so that the members (90), (91) are locked. In another modification, the vertical deviation sensor (193), Fig. 6 (not shown), engages a surface (196) of member (191), which surface forms the control templet. The templets and their holders are provided with passages so that a temperature controlled fluid can be circulated so as to maintain constant dimensions irrespective of temperature influence.