FR2515555A1 - Multi spindle drilling head - uses sun gear to drive spindle via satellite with spindle position adjusting about sun and satellite axes - Google Patents

Abstract

The multi-spindle drilling head provides for circular adjustments of spindle (15) positions about the head axis (2) and that of an associated satellite pinion (9). A central input pinion (2') drives individual spindle pinions (17) via satellite pinions, bearing blocks (10) mounted on a plate (19) being used to both support and locate the spindle and satellite axles. Centring rings (20) in calibrated holes (19') locate the spindles relative to the plate, which is bolted onto a casing (21) shoulder. The casing is in turn bolted to the body (1), locking of the satellite axles (6) relative to the body being effected by a bevelled ring (4) and spacer plates (3) with a complementary bevel.

Description

The present invention relates to mechanics and particularly but not exclusively to drilling machines #
It is known practice to equip the chuck with drilling machines, with a head with several spindles, driven simultaneously and each equipped with a working tool.

 These pins are offset and adjustable on the one hand circularly and concentrically with respect to the axis of the drive mandrel and on the other hand, circularly with respect to their idler shaft so as to allow their arbitrary angular positions in view of the most diverse uses.

 In these multiple pin heads, the locking of the pins in the position of use is carried out individually, thereby causing a lack of precision and a difficulty of operation. In addition, the means used are not very accessible.

 According to the invention, it was desired to produce a head with multiple precision pins allowing, through its upper part, a simultaneous blocking of all the pins, after their adjustment in position by means of an interchangeable mounting template for only be used for their installation according to the drilling coordinates.

 These characteristics and others will emerge from the following description.

To fix the subject of the invention without however limiting it, in the appended drawings:
Figure 1 is a small scale view in diametral section, of a drilling head made according to the invention.

 Figure 2 is a bottom view corresponding to Figure 1.

 Figure 3 is a plan view in section along line 3-3 of Figure 1.

 Figure 4 is a plan view and in section along line 4-4 of Figure 1.

 As shown in drawing, the device for mounting and blocking the spindles shown, which can be used in particular on a column drilling machine, comprises a body (i) supporting by its axial bore the motor shaft (2) which can rotate freely on bearings ( R-R1) held in place by circlips. This shaft (2) forms at its upper part either a conical mounting tail, or a diametrically split bearing to correspond to the driving mandrel of the machine. At its sweep the shaft f2) is ~ paui.a to form a toothed pinion (21) axial distributor of the rotational movement.

 According to its inner block, the body (1) is established with a circular groove (1 2) forming a concentric bearing (12) for centering and supporting a plurality of studs (3) arranged circularly and corresponding each to a spindle element. The studs (3) also bearing on the bottom of the groove (11) respectively form an external conical bearing (3) to correspond to the complementary conical bore of a clamp or clamping ring ( 4) centered externally and freely on the outer periphery of the groove (1). This flange (4) is held and axially recalled in the clamping and rocking position of the studs (3) on the bearing surface (31) by means of screws (5) whose embedded heads are housed in the body (1). Therefore, it is conceived that after unlocking the flange (4), the studs (3) can be adjusted circularly and concentrically at will relative to the axis of the shaft (2), along 360 degrees .

 Each of the studs (3) is further pierced in thickness to allow the fitting of an intermediate axis (6) whose outer flange (61) substantially median delimits two bearing surfaces, namely: an extreme bearing (62) cotd body (1 )), for mounting on bearings (7 - 8), of a satellite pinion (9) which is driven by the pinion (21) of the shaft (2), and an opposite bearing (63) for engagement free rotation of the corresponding bore of a spindle body (10) held in translation by a screw (11) 4 cooperating at its end with a groove (6).

 The spindle body (10) also constitutes another parallel bore (for receiving bearings (12 - 13) and ball bearings (14) of an output shaft (15) whose end is coupled by key (16) an output pinion (17) meshing with the free part of the satellite pinion (9). ends of the spindle body.

 The projecting external part of the shaft (15) authorizes the coupling of a chuck (## M) clamp holder (18) for clamping the tool. It is obvious that the spindle body (10) can receive any other type of tool holder.

 According to these provisions, it is understood that the spindle body (10) and consequently the shaft (15) can rotate circularly around the intermediate axis (6) to allow the concentric movement of the tool along 360 degrees, in combination with the circular displacement of the corresponding stud (3) and consequently of the satellite pinion (9) around the pinion (21) of the shaft (2) also in 360 degrees. This possibility allows preselected drilling positions on one or more parts of the structure.

 It should be noted that the drilling positions of each tool are defined by a mounting template drilled according to the drilling layout adopted, and being in the form of a circular plate (19) of which each calibrated and positioned hole allows the centering of the outer periphery of a ring (20) engaged on the projecting periphery of the bearing (13). This plate (19) is centered externally in the shouldered housing (211) of a housing (21) while being locked in position by radial screws (22).

 During assembly, each spindle body (10) thus positioned, by the engagement of the ring (20) in the calibrated hole (191) takes ex support by its hard end the inner plane face of the plate ( 19), while screws (23) arranged in a circular manner allow the assembly of the housing (21) on the body (1) on the opposite side.

 According to these provisions, it can be understood that the positioning of each tool, as a function of a change in an assembly template as well as the addition or removal of certain elements of the spindle body (10) is carried out very quickly by simple disassembly of the housing (21).

 It must be considered that after adjustment in position, each spindle body (10) is rigidly maintained on the one hand, by blocking the corresponding stud (3) via the flange (4), and on the other hand by centering the ring (20) in the calibrated hole of the plate (19). Therefore, this fixing at two ends eliminates the vibrations of the spindle body while ensuring high machining precision.

  It is also noted that each or certain spindle body (10) of the same multi-spindle head may also be equipped with pinions (9 and 17) of variable ratios making it possible to judiciously adapt the speed of the tools according to the different diameters and cutting speeds. . To this end, the satellite pinion (9) is provided stepped with two teeth of different diameters.

 The invention is in no way limited to that of its modes of application, nor to those of the embodiments of its various parts which have been more particularly indicated; on the contrary, it embraces all its variants.

Claims (4)

-1- Device for mounting and blocking multiple spindles of drilling heads for machine tools comprising a main drive shaft provided with a central pinion for meshing with planet pinions (9) mounted respectively on each of the spindle bodies circularly adjustable and provided with a circularly adjustable output shaft driven by said satellite pinion, characterized in that all of the spindle bodies (10) are blocked, after circular adjustment around the drive shaft (2 ) and lower positioning of their output shafts (15), by means of a plate (19) housed in a housing (21) secured to the body (1) by means of a sliding clamp (4) with clamping means centered in a groove (11) concentric with the body (1), the conical bore of which acts on the outer conical bearing surface (31) of studs (3) circularly centered on a cancentric bearing surface of said groove ( 11), with a view to locking them in position; each stud (3) being coupled to the intermediate axis (6) on which the spindle body (10) rotates. -2- Device for mounting and blocking multiple pins according to claim 1, characterized in that the plate (19) provided with holes along the adopted drilling pattern is centered and fixed in the shouldered housing (211) of a removable casing (21) fixed opposite to the periphery of the body (1), while its inner flat face allows the support of each spindle body (10) held opposite by the blocking of the stud (3) corresponding. -3- Device for mounting and blocking multiple pins, according to claims 1 and 2 taken together, characterized in that the plate (19) allows each of its calibrated holes (19) along the drilling pattern, outer centering of a ring (20) mounted on the periphery of the bearing (13) of the output shaft (15). -4- Device for mounting and blocking multiple pins according to claims 1, 2 and 3 taken together, characterized in that each spindle body (10) is adjustable on the one hand circularly after release by the circular movement of its stud (3) in the groove (1 ^) of the body concen-ric to the main drive shaft (2) and on the other hand rotating around the intermediate axis (6) to allow engagement and this trage of its output shaft (15) in the corresponding calibrated hole (191) of the plate tel9).  -S- Device for mounting and blocking multiple spindles according to claims 1, 2, 3 and 4 taken together, characterized in that each spindle body (10) of the same multi-spindle head can be fitted with pinions (9 and 17) variable ratios by the use of a pinion gear (9) with stepped teeth of different diameters; this arrangement making it possible to adapt the cutting speed of the tool.