JPH0217764Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is installed in a processing unit that has multiple spindles and moves in three dimensions, and each spindle can operate independently, making it an ideal axis for machining different types of workpieces at any location on the workpiece. Concerning selectable multi-spindle heads.

For example, in the case of a linear transfer machine or the like, one station usually drills holes of one diameter, or a multi-drill ring head is used to simultaneously drill a plurality of holes. However, in the former case, when drilling holes with different diameters, the drills with different diameters must be replaced using an automatic tool exchanger, etc.
The machining time at one machining station becomes long, and the equipment itself becomes complicated. Furthermore, the latter method is not suitable for those who frequently change the hole drilling position for the workpiece, and has drawbacks such as the need to replace the head itself.

Therefore, in this invention, a single spindle head is provided with multiple spindle device bodies, and these bodies are installed in a three-dimensionally moving machining unit that protrudes from the machining origin position to the machining position to perform different machining on the workpiece. , which provides a multi-spindle head with selectable axes that is ideal for multi-spindle machines.

Hereinafter, one embodiment of this invention will be described in detail using the drawings.

FIG. 1 shows the structure of a processing station in a linear transfer machine to which this invention is applied, in which a positioning unit 11 and a spindle unit 12 are installed opposite each other on a main base 10.

The positioning unit 11 includes a base 13, a pallet 14 mounted on the base 13 so as to be movable in a direction perpendicular to the plane of the paper, and a fixture 15 mounted on the pallet 14. Further, the spindle unit 12 includes a base frame 17 that is provided to be movable back and forth on a station base 16, an elevating frame 18 that is located in front of this base frame 17 and that can be moved up and down, and a lifting frame 18 that is located in front of this elevating frame 18. , a left-right moving frame 19 provided to be able to move left and right in a direction perpendicular to the plane of the paper, and a spindle head 20 installed at the lower end of this moving frame 19, and each of the frames 17, 18, 19 is The spindle heads 20 are driven in conjunction with DC servo motors M ₁ , M ₂ , and M ₃ , respectively, to move the tip of the spindle head 20 three-dimensionally relative to the fixture, thereby drilling a hole in the workpiece held by the spindle head 20 . It's getting old.

As shown in FIGS. 2 and 3, the left-right moving frame 19 has a high-frequency motor 21 mounted on its upper end, and a pulley 22 on the output shaft of the motor 21.
is attached to the shaft.

On the other hand, in the casing 23 of the spindle head 20, a pair of spindle device bodies 24, 24 which are pivoted in parallel are attached to each body in parallel, and each of the bodies 24, 24 is attached via a connecting plate 25.
It consists of a pair of cylinders 26 that alternately drive the cylinders to protrude and retract from the casing 23, a drive sleeve 27 that is bearing at the rear of each main body 24 and is connected thereto, and a pulley 28 that is pivotally attached to this sleeve 27. 28 and the pulley 22 of the motor 21
By passing the belt 29 between
The rotational power of the motor 21 is transmitted to each spindle device main body 24.

As shown in FIG. 4, the spindle device main body 24 includes a sleeve 30 slidably inserted into the casing 23, rotatably supported by the sleeve 30, and has a preset chuck at its tip. Main shaft spindle 32 equipped with 31
and at the rear end of the sleeve 29,
The above-mentioned connecting plate 25 is fixed at one end to the protruding end of the plunger 26a of the cylinder 26, and when the cylinder 26 is driven, the main shaft spindle 32 is moved forward and backward together with the sleeve 30, and is held by the preset chuck 31. Hole drilling is performed using a drill 33.

Further, the rear projecting end of the main shaft spindle 32 from the sleeve 30 is connected to the drive sleeve 27 by a spline groove connection, allowing movement thereof in the axial direction.

In FIG. 2, the reference numeral 34 is a probe of a cutting tool breakage detection device.

Next, to explain the operation of the device according to the present invention configured as above, first, the fixture 15
When the spindle unit 12 is positioned at the processing station, the cylinder 26 advances the spindle device main body 24 of the spindle unit 12 in the processing standby position to select it.

Next, each frame 18, 19 is moved vertically and horizontally, one drill of each spindle device body 24 is positioned at the processing position of the workpiece held by the fixture 15, and then the frame 17 is moved forward by the DC servo motor _M1 . Drill a hole in the workpiece and then move it back.

If there are multiple holes to be drilled with the same drill diameter, the positioning and drilling operations using the respective frames 18 and 19 are repeated as described above. Next, move one drill backwards and move the other spindle to the device body 2.
If you select No. 4 and perform positioning in the same way while drilling with the other drill, different types of drilling operations will be performed at one processing station.

Note that if the diameters of the drills are different and it is desired to change the rotational speed between the left and right sides, adjustment can be made by changing the diameters of the pulleys 28. Further, in the above embodiment, a pair of left and right spindle device bodies are provided, but it is of course possible to provide a larger number of spindle device bodies.

As described in detail in the embodiments above, a multi-spindle head with selectable axes is installed in a processing unit that moves in three dimensions, and one spindle head is provided with a plurality of spindle device bodies, and these are Since the workpieces are made to protrude alternately from the machining origin position to the machining position to perform different machining on the workpiece, for example, in a machining unit that moves in three dimensions, such as the machining unit of an NC transfer machine, one station can perform different machining operations. If you want to drill a hole of a different diameter, you can now drill a different type of hole without relying on tool exchange using an automatic tool changer as in the past, simplifying the mechanism and significantly reducing the machining time at one station. It has the advantage that it can be shortened to .

[Brief explanation of the drawing]

Fig. 1 is a side view of a processing station of a linear transfer machine to which this invention is applied, Fig. 2 is a front view of a moving frame equipped with a spindle head according to this invention, and Fig. 3 is A of Fig. 2. 4 is a vertical sectional view showing details of the spindle head. 20... Spindle head, 21... High frequency motor, 23... Casing, 24... Spindle device main body, 25... Connection plate, 26... Cylinder,
27... Drive sleeve, 30... Sleeve, 31
...Preset chuck, 32...Main shaft spindle.

Claims (1)

[Scope of Claim for Utility Model Registration] A plurality of sleeves slidably provided on a casing, a main shaft spindle cooperating with each sleeve and rotatably attached to the shaft, and having a chuck at its tip, and the main shaft. a rotational drive sleeve to which a rear end extension of the spindle is axially connected by a spline groove connection; and on each of the sleeves, for sliding the sleeve in the axial direction with respect to the casing;
the sleeve and a cylinder connected via a connecting plate, each of the rotation drive sleeves being configured to rotate from one drive motor via a rotation transmission means, rotating the main shaft spindle and driving the rotation drive sleeve by each cylinder. A multi-spindle head with axis selection that can operate independently and is installed in a processing unit that moves in three dimensions.