GB2157211A

GB2157211A - Horizontal drilling and milling machine

Info

Publication number: GB2157211A
Application number: GB08505504A
Authority: GB
Inventors: Matthias Malzkorn; Helmut Holz
Original assignee: Scharmann GmbH and Co
Current assignee: Scharmann GmbH and Co
Priority date: 1984-03-02
Filing date: 1985-03-04
Publication date: 1985-10-23
Also published as: GB2157211B; GB8505504D0

Abstract

The machine has a pivotable spindle head 7 which is inclined at 45 DEG to the horizontal and which can be locked to a support housing 4 in the horizontal and the vertical operating position of the spindle. The spindle or spindle sleeve 24 can be driven by way of a transmission. To ensure that the spindle head 7 is rotated and precisely locked relative to the support housing 4 with structurally simple means the pivoting movement of the spindle head 7 is taken off the spindle driving shaft 14 of the support housing 4. <IMAGE>

Description

SPECIFICATION Horizonatal drilling and milling machine The invention relates to a horizontal drilling and milling machine with a spindle head pivotable about an axis inclined at 450 to the horizontal.

Horizontal drilling and milling machines of this type are know from German Offenlegungsschriften (Laid-Open Specifications) 26 13 736 and 22 52 366 and US Patent 3 448 656. In this connexion the spindle head is rotated by a rack-and-pinion drive or the like by means of a linear piston. The rotatable spindle head which can be displaced on a supporting journal by means of the latter is locked and released by cylinder-piston units and cup springs, a Hirth-type toothing being used for securing the spindle head.

The object of the invention is to improve a horizontal drilling and milling machine of the type described above so as to ensure that the spindle head is rotated and precisely locked relative to the support housing with structurally simple means.

The invention provides a horizontal drilling and milling machine, comprising a pivotable spindle head which is inclines at 450 to the horizontal and which can be locked to a support housing in the horizontal and the vertical operating position of the spindle, and the spindle or spindle sleeve can be driven by way of a transmission, in which the pivoting movement of the spindle head can be taken off the spindle driving shaft of the support housing.

The advantage of the machine according to the invention is that only a single drive is required for the pivoting movement of the spindle head supporting the spindle or spindle sleeve on the one hand and for the rotational movement of the spindle or spindle sleeve on the other hand despite the differing rotational speeds of these components, and in addition it is possible to lock the spindle head precisely.

The invention will be described further, by way of example, with reference to the accompanying drawings, in which: Figure 1 shows a horizontal drilling amd milling machine with its column, the headstock, and the spindle head with its drilling spindle sleeve in various vertical operating positions; Figure 2 shows the spindle head with the drilling spindle sleeve in various horizontal positions; Figures 3 and 4 are vertical sections through the support housing of the spindle head and through the spindle head itself in both its end positions, in which the drilling spindle sleeve occupies its horizontal position in Fig. 3 and its vertical position in Fig. 4; and Figures 5 and 6 show the drive and the locking of the spindle head in both its operating positions.

The vertical column 2 is horizontally displaceable on the machine bed 1. The headstock 3 is vertically adjustable on the column 2 and its forward end (left-hand side in Figs. 1 and 2) it carries a support housing 4 which has a boundary surface 5 inclined at 450 to the horizontal. The spindle head 7 of the drilling and milling machine, which is pivotable about an axis 8 normal to the surface 5 and therefore inclined at 450 to the horizontal, has a similar boundary surface 6. The spindle head 7 supports the spindle sleeve 24 (Figs. 3 and 4), which projects at 10 (Figs. 1 and 2) from the wall 9 of the spindle head and into the free end of which a tool can be inserted.

On account of the displaceability of the column 2 in the horizontal plane and of the headstock 3 in the vertical plane, the drilling spindle sleeve can occupy the inidividual positions 10, 10', 10", 10"' etc. (Fig. 1) when in its vertical setting. When the spindle head 7 is rotated 1800 about the axis 8, so that the initially lower wall 9 now occupies the vertical position 9', the drilling spindle sleeve occupies the horizontal position 10a and, on account of the displaceability of the slide and the headstock 3, can occupy the various positions 10a', 10a", 10a"' etc.

(Fig. 2). In this way the workpiece (not shown) clamped on the rotary table 11 can be machined from above and from all sides.

The headstock 3 comprises a driving shaft 12 which transmits its rotational movement to a shaft 13 in the support housing 4. This shaft supports a sleeve 14, which is joined thereto rotationally rigidly and whose end facing the spindle head 7 is provided with a bevel gear 15 in a rotationally rigid manner. A further bevel gear 16 is disposed in the housing 4 the axis 8 about which the spindle head 7 is rotatable. The bevel gear 16 meshes with a bevel gear 17, which is rigidly joined to a sleeve 18 carried rotationally rigidly by a vertical shaft 19. A spur gear 20, which is mounted near or in the junction plane 21 of the support housing 4 and the spindle head 7, is likewise mounted rotationally rigidly on the said shaft 19.

A spur gear 22 is provided on the end of the shaft 13 adjacent to the spindle head 7, and is thus directly adjacent to the bevel gear 15. In addition, the spindle sleeve 24, which rotationally rigidly supports a spur pinion 25 meshing with a further similar pinion 26, is mounted in the spindle head 7 with the aid of bearings 23.

When the spindle head 7 is set in accordance with Fig. 3, the drive is transmitted from the shaft 13 by way of the spur gear 22 thereof to the pinion 26 and from there by way of the pinion 25 to the drilling spindle sleeve 24, in the taper 24a of which the tool can be inserted. If, after a rotation through 1800 with respect to the position according to Fig.

3, the spindle head 7 is in the position according to Fig. 4, in which the drilling spindle sleeve 24 is orientated vertically, the drive of the sleeve 24 is transmitted from the shaft 13 by way of the bevel gear transmission 15, 16, 17 to the spur gear 20 and from the latter by way of the two pinions 26, 25 to the sleeve 24.

The spindle head 7 is movable backwards and forwards in the direction of the axis 8 and is pivotable about the said axis. For this purpose the support housing 4 comprises a rigid supporting journal 27 which projects into the spindle head 7 and which is mounted with its longitudinal axis L coincident with the axis 8. The rotational move ment of the spindle head 7 about the journal 27 is taken off the shaft 13. For this purpose the shaft 28 carrying the bevel gear 16 carries a rotationally rigid gearwheel 29, with which is associated at the same level, but at a distance, a further gearwheel 30 secured to a shaft 31 (which is mounted in the support housing outside the plane of the drawing in Figs. 3 and 4).A coupling wheel 32, which can be brought into and out of engagement with the gearwheels 29, 30 when it is displaced along its axis 33, is provided in order to rotate the said shaft 31 at will, when the spindle head 7 is rotated through 180 about the journal 27.

At the lower end of the shaft 31 facing the spindle head 7 a gearwheel 31a (Figs. 5 and 6) is mounted rotationally rigidly, which has a specific width and is in permanent engagement with internal toothing 35 of a toothed rim 34 which is arranged concentrically about the supporting journal 27 and is held on the spindle head 7 by means of screws 36. If the shaft 31 is rotated when the wheel 32 is engaged, the spindle head 7 will also be rotated. In this way the drive of the spindle sleeve 24 into both its horizontal and its vertical position and the rotation of the spindle head 7 is taken off the common driving shaft 13.

In order to position and lock the spindle head 7 precisely in its horizontal or vertical position into which it has moved in each case and in order to release it from these positions, there are provided in the support housing 4 preferably four cylinderpiston units 37 which are arranged in a circle concentrically about the supporting journal 27 and at a uniform distance from one another and which comprise a cylinder housing 38 with a smaller cylinder chamber 39 and a larger cylinder chamber 40, and a piston 41 in the chamber 40 is movable from its position shown in Fig. 5 into the position according to Fig. 6 and vice versa, this being effected by actuation of the piston top 41a on one side and by the effect of a spring 43 disposed in the smaller cylinder chamber 39 between the base 42 thereof and the piston underside 41b.The springs 43 of all the cylinder-piston units 37 are capable of jointly holding the spindle head 7 in its engaged position according to Fig. 6.

The piston rods 44 of the cylinder-piston units 37 each have a plate 45, all the plates jointly supporting an internal toothed rim 46 which is likewise disposed concentrically around the supporting journal 27, like the mating toothed rim 47 on the underside of the toothed rim 34. On the side remote from the toothed rim 46 the plates 45 of the preferably four cylinder-piston units 37 jointly support a toothed rim 48 which is likewise concentric with the supporting journal 27 and to which corresponds in design and position a mating toothed rim 49 on the underside of a ring 51 secured to the support housing 4 by means of screws 50. The spindle head 7 is sealed off from the support housing 4 by seals 52, 53 when the spindle head occupies its locked position according to Fig. 6.

In order to rotate the spindle head 7 about the journal 27 the chambers 40 of the cylinder-piston units 37 are acted upon so that the plates 45 occupy the position according to Fig. 6 and the toothed rims 46, 48 are out of engagement with their mating toothed rims 47, 49 and when the shaft 31 is rotated the spindle head 7 can be rotated with the aid of the gearwheel 31a and the toothed rim 35. When pressure is released from the piston 41, the springs 43 displace the plates 45 upwards against the support housing 4 with the aid of the piston rods 44, the teeth of the gearwheel 31a remaining in engagement with the teeth of the internal toothing 34 of the toothed rim 35; the toothed rim 46 engages in its mating toothed rim 47 and the toothed rim 48 engages in its mating toothed rim 49 (cf. Fig. 6), so that the spindle head 7 is coupled to the support housing 4 and the shaft 31 is secured.

Claims

1. A horizontal drilling and milling machine, comprising a spindle head which is carried by a support housing and which has a spindle or spindle sleeve, the spindle head being pivotable relative to the support housing about an axis inclined at 45 to the horizontal and being lockable to the support housing in both a horizontal and a vertical operating position of the spindle or spindle sleeve, the spindle or spindle sleeve being driven by way of a transmission from a driving shaft in the support housing, the pivoting movement of the spindle head being taken off the said driving shaft.

2. A machine as claimed in claim 1, in which by way of an axially longitudinally displaceable gear coupling the said driving shaft is engageable with and disengageable from a shaft effecting the pivoting movement of the spindle head.

3. A machine as claimed in claim 1 or 2, in which the spindle head carries a toothing into which a driving pinion engages which is rotated by the said driving shaft of the spindle or spindle sleeve by way of a gear coupling and a gearwheel transmission.

4. A machine as claimed in claim 3, in which the said toothing is an internal toothing of a toothed rim which is arranged concentrically about a supporting journal of the support housing and the underside of which supports part of a gear coupling.

5. A machine as claimed in claim 4, in which the support housing has a plurality of cylinder-piston units which are arranged concentrically about the supporting journal of the support housing and at a uniform distance from one another, the piston rod of each carrying a plate with two toothed rims mating with toothed rims which are disposed on the support housing and the toothed rim which is connected to the spindle head and which is in engagement with the said driving pinion.

6. A horizontal drilling and milling machine substantially as described with reference to, and as shown in, the accompanying drawings.