JPH0366099B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) Industrial Application Field The present invention relates to a machine tool, and particularly to a machine tool that moves a work table to process a workpiece.

BACKGROUND OF THE INVENTION Conventionally, most work tables have been transported horizontally, and the upper surface of a work fixed on the upper surface has been machined using a vertical machining center.

Problems to be Solved by the Invention According to the above-mentioned conventional device, chips remain in the machining hole on the top surface of the workpiece and on the worktable, and it takes time and effort to remove them, resulting in time-consuming workpiece replacement. This caused the problem that it would take longer.

(Structure of the Invention) Means for Solving the Problems In order to solve the above problems, the present invention provides a work table work station in front of a horizontal spindle head, a work table standby station on both sides thereof, and a pair of work table standby stations. In a machine tool in which a work table is reciprocated between two stations, the work station has a rotating shaft rotatably supported on the base, a tilting table is integrally connected to this rotating shaft, and a tilting table is connected to the rotating shaft. A guide groove on the underside of the work table and a cylinder for raising and lowering the presser foot, which can be removed from the system, are installed inside, and the pressure piping to this cylinder is connected to the pressure oil passage formed in the rotating shaft, and the tilting table can be adjusted between horizontal and vertical positions. A lifting drive device is provided for raising and lowering between the states, and further, a stopper is integrally attached to the raising table, and the stopper comes into contact with a receiving plate provided on the base when it is in the vertical state. The present invention is characterized in that a positioning pin having a wedge surface that engages with the opposite side of the stopper to the receiver and presses the stopper toward the receiver is provided so as to be removable from the stopper.

Effect According to the above, even if a workpiece is to be mounted on a work table in a horizontal state at a standby station, the work table is horizontally transferred to the work station, is integrally attached to the tilting table with a presser foot, and the tilting drive device is used to move the work table horizontally to the work station. The tilting table is set vertically, and the stopper integrated with the tilting table is held vertically by sandwiching the wedge surface of the receiving plate and the positioning pin, and the workpiece is machined with the upper surface vertically facing the main axis.

Embodiment As shown in FIGS. 1 and 10, a horizontal machining center 1 is provided with a spindle head 2 that moves left and right, up and down, and back and forth, and a work table work station (hereinafter referred to as work station) S1 is installed in front of the spindle head 2. , there is a work table standby station (hereinafter referred to as standby station) S on the left and right sides.
2 are provided respectively. First, waiting station S2
are the same on the left and right, so only one will be explained. Two guide rails 4, 4 are fixed parallel to each other along the longitudinal direction on the base 3, and these guide rails 4, 4 have T-shaped holes formed on the lower surface of the work table T, as shown in FIG. A large number of horizontal rollers 6 that guide the inner surface 5a of the protruding edge of the guide groove 5 and vertical rollers 7 that guide the bottom surface 5d are provided. A hydraulic cylinder 8 is mounted on this base 4 on its front side in parallel with the guide rails 4, and a connecting arm 10 is fixed to the tip of the cylinder rod 9. 11 tips are connected. The guide bar 11 is slidably fitted into a guide 13 fixed to a bracket 12 fixed on the base 3. A plate-shaped engagement arm 14 is fixed to the front side of the connecting arm 10. Reference numeral 15 denotes an engagement piece attached to the lower front surface of the work table T, which has a concave cross section opening downward, and is connected to the upper end of the engagement arm 14 in the longitudinal direction (reciprocating direction) of the work table T in a horizontal state. ) and can be freely engaged and disengaged in the vertical direction.
6 and 16, a work table reciprocating device 17 is configured to reciprocate the work table T between the work station S1 and the work station S1.

Next, the work station S1 will be explained.
A rotary shaft 19 is rotatably supported by bearings 18, 18 fixed to parts of the base 3 of the left and right standby stations S2 near the main shaft head 2, respectively;
One end (left end in FIG. 1) of this rotating shaft 19 is rotatably fitted into a sleeve 20 which is fixed on the base 3. This sleeve 20 has the sixth and seventh sleeves.
As shown in the figure, an annular groove 23 formed on the inner surface of the sleeve 20 has pressure oil supply and discharge ports 21 and 22,
Two pressure oil passages 2 in the rotating shaft 19 via 24
5 and 26, respectively, and is connected to a cylinder 32 inside a tilting table 31, which will be described later, by steel pipes 27 and 28. As shown in FIG.
9 and 29 are integrally connected to the rotating shaft 19 by a key. Sector gears 30, 30 centered on the rotating shaft 19 are formed at the tips of the fan-shaped members 29, 29. As shown in FIG. 2, a tilting table 31 is mounted and fixed on the fan-shaped members 29, 29 at both left and right sides thereof. A cylinder 32 is installed inside the tilting table 31, and the tip of a piston rod 33 is fastened to a presser foot 34. A positioning member 35 that comes into contact with the lower surface of the work table to perform vertical positioning, and a positioning pin 36 that engages with a positioning hole (not shown) on the lower surface of the work table T to perform front, rear, right, and left position positioning are disposed on the upper surface of the tilting table 31. has been done. The presser foot 34 is set at the rising end of the piston rod 33 at a height that allows the work table T to reciprocate between the standby station S2 and the inner wall 5c and bottom surface 5d of the guide groove 5 on the lower surface of the work table T.
A plurality of rollers 37 and 38 are attached to guide the. A work table fixing device 31A is configured in which the lower surface of the presser foot 34 presses the inner surface 5b of the edge of the guide groove 5 of the work table T when the piston rod 33 descends, thereby fixing the work table T to the tilting table 31. The sector gears 30, 30 include a pair of left and right intermediate gears 4 that rotate together with a transmission shaft 40 that is rotatably supported by a pair of brackets 39, 39 that are integrally fixed to the bases 3, 3.
1 and 41 are meshed with each other, and one of the intermediate gears 41 is further meshed with a drive gear 43 connected to a hydraulic motor 42, and together with the sector gears 30 and 30, constitutes an elevating drive device for the elevating table 31. .
The fan-shaped members 29, 29 each have a stopper 4 on the outer surface.
4 and 44 are installed, and the left and right standby stations S
2. The support plates 45, 45 attached to the inner end faces of the bases 3, 3 of S2 come into contact when the tilting table 31 is in an upright state. wedge surface 4
6,46 are formed. This wedge surface 46,
46, as shown in FIGS. 8 and 9, when the tilting table 31 is in an upright state, the fan-shaped member 2 is moved forward by the cylinders 47, 47 mounted inside the bases 3, 3.
Positioning pins 48 and 48 that move in the 9 and 29 directions
It engages with the wedge surfaces 49, 49 at the tip, and the stopper 4
4 and 44 are strongly pressed against the receiving plates 45 and 45 to hold the tilting table 31 in an upright state, and together with the sector gear 30 and the like, a work table tilting device 29A is constituted. Incidentally, the upper surfaces of the receivers 45, 45 are connected to the leveling stopper 5 of the tilting table 31 provided on the outside of the fan-shaped members 30, 30, respectively.
0 and 50 to keep the tilting table 31 horizontal.

According to such a configuration, the standby station S
2. Mount the workpiece horizontally on the worktable T with the machined surface facing up. Next, the hydraulic cylinder 8 is moved forward, and the work table T is sent onto the presser foot 34 located at the rising end of the raising table 31.
Next, the hydraulic cylinder 32 inside the tilting table 31 acts to lower the piston rod 33 and fixing the work table T on the tilting table 31. At this time, the front and rear, left and right, and up and down positions are determined by the positioning member 35 and the positioning pin 36. It can be decided. Then, the hydraulic motor 42 starts rotating, and the rotation is controlled by the drive gear 4.
3. The transmission is transmitted to the left and right sector gears 30, 30 via the intermediate gears 42, 42, the fan-shaped members 29, 29 are rotated, the raising table 31 is raised together with the work table T, and the locking piece 15 on the work table T surface is rotated. The engagement arm 14 at the tip of the cylinder 8 is disengaged, the stoppers 44, 44 contact the receivers 45, 45, the hydraulic motor 42 is stopped, and the positioning pins 48, 48 are removed from the left and right bases 3, 3. Protruding stopper 4
The stoppers 44, 44 are engaged with the wedge surfaces 46, 46 of 4, 44, and are sandwiched between the stoppers 44, 44 and the receivers 45, 45 to maintain the upright state. In this way, when the work table T is in an upright state, the main shaft approaches,
Process the processing surface of the workpiece. The chips produced at this time are
Because the work table T is vertical, the work table T
It falls without collecting on top. While machining is being carried out in this manner, the next work is prepared on the work table T on the other standby station S2. When machining of the workpiece on the upright work table T is completed, the positioning pins 48, 48 are moved back, the stoppers 44, 44 are disengaged, and then the hydraulic motor 42 is reversed to move the tilting table 31 to the work table T.
and tilt it horizontally. When the tilting table 31 becomes horizontal, the engagement piece 15 on the lower surface of the work table T engages with the engagement arm 14 at the tip of the cylinder rod 9. When the tilting table 31 becomes horizontal, the internal cylinder rod 3
3 is raised and the work table T is moved by the presser foot 34.
is released, and then the cylinder 8 is moved back and the work table T is moved to the original standby station S2. At the same time, the work table T with the work mounted thereon is moved from the other standby station S2 to the work station S1, and thereafter, this operation is repeated, and the work tables T on the left and right standby stations S2, S2 are alternately sent to the work station S1. , stand upright in that position and process.

In this embodiment, the work table reciprocating device has an engaging arm at the tip of the cylinder and an engaging piece on the lower surface of the work table, and this engaging piece engages with the engaging arm in the reciprocating direction of the work table and in the vertical direction. Equipped with a removable engagement surface, when raising and lowering the work table,
It can be engaged and disengaged simply by raising and lowering it.

Effects of the Invention As described above, in the present invention, when a workpiece is attached to and removed from a worktable in a horizontal state at a standby station, the workpiece table is set vertically at the workstation and the upper surface of the workpiece is stood upright for processing. Chips fall onto the work table without accumulating, making removal of chips extremely easy.
In addition, the stopper of the tilting table, which integrally locks the work table with the presser foot, is held between the receiver of the base and the positioning pin having a wedge surface that presses the stopper against the receiver, and holds the tilting table in the vertical position. There is no play between the stopper and the receiver, and vertical positioning accuracy is high. Further, since the piping to the clamping cylinder of the work table installed in the tilting table is carried out through a pressure oil passage in the rotary shaft that rotates integrally with the tilting table, there are advantages such as easy piping.

[Brief explanation of drawings]

Fig. 1 is a plan view of essential parts of the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is a cross-sectional view, Figs. 4 and 5 are views showing the work table reciprocating device, and Figs. 8 is a diagram showing the rotating shaft of the tilting table, FIG. 8 is a diagram showing the tilting table in a vertical state, FIG. 9 is a diagram showing the positioning device, and FIG. 10 is an overall view of the present invention. 2... Spindle head, 3... Base, 5... Guide groove, 19... Rotating shaft, 25, 26... Pressure passage,
31... Lifting stand, 32... Cylinder, 34... Presser foot, 44... Stopper, 45... Receiver, 48
...Positioning pin, 49...Wedge surface, 29A...
...Work table lifting device, 31A... Work table fixing device, S1... Work table work station, S2... Work table standby station, T... Work table.

Claims (1)

[Claims] 1. In a machine tool in which a work table work station is provided in front of a horizontal spindle head, work table standby stations are provided on both sides of the work table, and a pair of work tables are reciprocated between the two stations, the work station is ,
A rotary shaft is rotatably supported on the base, a tilting table is integrally connected to this rotary shaft, and a cylinder is installed inside this tilting table to raise and lower a presser foot that is removable from the guide groove on the underside of the work table. A pressure piping is connected to the rotary shaft through a pressure oil passage formed in the rotating shaft, and the tilting table is provided with a tilting drive device for raising the tilting table between a horizontal state and a vertical state, and the tilting table further includes: A stopper is integrally attached to the base, which abuts against a receiving plate provided on the base when the vertical position is reached, and the stopper is engaged with the opposite side of the receiving plate to push the stopper toward the receiving plate. A machine tool characterized in that a positioning pin having a wedge surface to be attached is provided in a manner that can be engaged with and detached from a stopper.