JPH05314Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a laser processing machine that processes a workpiece by irradiating laser light from a nozzle.

Conventional technology Conventional laser processing machines that process workpieces using laser light are equipped with a nozzle device that freely rotates in three axes, and the nozzle of this nozzle device irradiates the workpiece with laser light. , configured to process a workpiece.

Further, various applications have already been filed for nozzle devices.

For example, JP-A-60-213390, JP-A-59-21491
No. etc.

However, in all of these publications, the motor that drives the nozzle body in the 3-axis directions protrudes from the nozzle body, so the motor may interfere with surrounding equipment when moving the workpiece in the 3-axis directions, or the motor may interfere with surrounding equipment. There are problems such as the number of wired cables getting tangled with the motor and causing a malfunction.

To improve the above-mentioned problem, as shown in Fig. 4, motors a, b, and c for driving each axis are provided on the upper part of the main body case d, and the driving of these motors a, b, and c is tripled. It has also been proposed that the nozzle body can be rotated in three axes (A-axis, B-axis, C-axis) by transmitting the information to the nozzle body through the rotational axes e, f, g and bevel gear h. ing.

Problems to be solved by the invention However, in the above nozzle device, for example, A.
When the shaft rotates, the drive side of the B-axis bevel gear h is fixed and the driven side rotates, so in order to maintain a constant wrist posture, it was necessary to rotate the B-axis motor b to correct the amount of rotation. .

Therefore, it is necessary to constantly calculate the correction amount and control the B-axis motor b according to the correction amount, which requires a calculation circuit and the like, which complicates the control system. There were also drawbacks such as deterioration due to electrical response errors.

This invention was made for the purpose of eliminating the above-mentioned drawbacks.

Means and action for solving the problem The nozzle body 27 is rotated in the A-axis direction by being driven by the A-axis motor provided in the main body case 8.
A shaft drive shaft 15 and a B shaft rotatably supported by the A shaft drive shaft 15 and attached to the A shaft drive shaft 15 side.
The nozzle body 2 is rotated by a shaft motor 10.
7 in the B-axis direction, and a C-axis motor 11 supported by the drive shaft and attached to the B-axis drive shaft 20 side rotates the nozzle body 27 in the C-axis direction. C-axis drive shaft 33
A laser processing machine that is equipped with a nozzle device that makes it possible to control each axis without the need for complex arithmetic processing.

Embodiment An embodiment of this invention will be described in detail with reference to the drawings shown in FIGS. 1 to 3.

Figure 1 shows the entire laser processing machine. In this figure, 1 is a bed, and 2 is a table placed on the bed 1 and movable in the Y-axis direction. 3 is placed.

4 is a column erected from both sides of bed 1,
A cross beam 5 is placed horizontally on the top of this column 4.
is suspended horizontally, and the cross beam 5
A saddle 6 is supported on the cross beam 5 so as to be movable in the longitudinal direction (X-axis direction), and a ram 7 is attached to this saddle 6 so as to be movable in the vertical direction (Z-axis direction).

A wrist portion 50 is attached to the lower end of the ram 7 and is rotatable in three axes, that is, the A-axis, B-axis, and C-axis directions.
A nozzle body 27 is provided through the nozzle body 27.

As shown in FIG. 2, the wrist portion 50 has a main body case 8 housed in the lower part of the ram 7 that is movable in the Z-axis direction, an A-axis motor 9 in the upper part of the main body case 8, and the main body case 8. B-axis motor 10 inside
and a C-axis motor 11 are provided.

The rotation of the A-axis motor 9 is transmitted from the reducer 12 to the A-axis drive shaft 15 via the drive gear 13 and the driven gear 14, so that the A-axis drive shaft 15 is rotated. The A-axis drive shaft 15 is a hollow shaft that functions as a guide tube through which the laser beam passes, as will be described later, and its lower end is bent at an almost right angle, so that the laser beam can be guided into the bent portion 15a.
A mirror 16 that refracts 90 degrees is installed.

Further, the B-axis motor 10 is protruded from the middle of the A-axis drive shaft 15 and installed on the gear case 15b, and the rotation of the B-axis motor 10 is controlled by the reduction gear 17.
The power is transmitted to the B-axis drive shaft 20 via the drive gear 18 and the driven gear 19.

The B-axis drive shaft 20 is rotatably supported on the outer circumference of the A-axis drive shaft 15 via a bearing 21, and is attached to the bent portion 15a of the A-axis drive shaft 15 by a bevel gear 22 provided at the lower end. Bearing 23
Interlocked with the B-axis interlocking shaft 24 supported via the
The B-axis interlocking shaft 24 is rotated together with the rotation of the B-axis drive shaft 20.

A laser beam guide cylinder 25 is attached to the tip of this B-axis interlocking shaft 24. The laser beam guide tube 25 is formed of a hollow tube having a substantially inverted L shape, and the laser beam refracted by the mirror 16 provided in the bent portion 15a of the A-axis drive section 15 is further guided into the bent portion. A mirror 26 that refracts 90° is provided, and the laser beam guide tube 25
A nozzle body 27 is spline engaged 28 at the lower end of the nozzle body 27 .

On the other hand, the C-axis motor 11 is installed on a gear case 29 fixed to the upper end of the B-axis drive shaft 20, and the rotation of the C-axis motor 11 is controlled by a reducer 30.
The signal is transmitted to the C-axis drive shaft 33 via the drive gear 31 and the driven gear 32.

The C-axis drive shaft 33 is supported on the outer circumference of the B-axis drive shaft 20 via a bearing 34, and is also supported on the B-axis interlocking shaft 24 via a bearing 36 by a bevel gear 35 provided at the lower end. It is interlocked with a C-axis interlocking shaft 37.

The tip of the C-axis interlocking shaft 37 is connected to the bevel gear 3.
8, it is interlocked with a tip tube 39 supported at the tip of the laser beam guide tube 25 via a bearing 38.

The tip tube 39 is screwed into the nozzle body 27 by a feed screw 40, and as the tip tube 39 rotates, the nozzle body 27 is moved in the C-axis direction, and the tip tube 39 and the C-axis interlocking shaft 37 are rotated. The outer peripheral portion is covered by a cover 42 supported by the main body case 8 via a bearing 41, and is protected from dust and the like.

On the other hand, a laser beam emitted from a laser oscillator (not shown) is guided above the A-axis drive shaft 15 from a laser beam guide tube 43 provided above the main body case 8, and is further refracted by mirrors 44, 16 and the like. The laser beam is guided to a condensing lens 45 provided at the tip of the laser beam guide tube 25, and is irradiated by this condensing lens 45 onto a workpiece placed on a table.
Workpiece 3 can now be processed.

Next, to explain the operation, since the nozzle body 27 shaft 24 is rotated when processing the workpiece 3,
The laser beam guide cylinder 25 attached to this B-axis interlocking shaft 24 is rotated by ±90° in the B-axis direction.

At this time, together with the B-axis drive shaft 20, the C-axis drive shaft 3
3 are also rotated together, and the A-axis drive shaft 15 is fixed to the main body case 8.

Next, when moving the nozzle body 27 in the C-axis direction, the C-axis drive shaft 33 is rotated by the C-axis motor 11. The rotation of the C-axis drive shaft 33 is caused by the C-axis interlocking shaft 3.
7 to the tip tube 39, which rotates the tip tube 39. As a result, the nozzle body 27, which is screwed together with the tip tube 39 by the feed screw 40, is moved in the C-axis direction, and at this time, the A-axis and B-axis drive shaft 15, 2
0 is in a state fixed to the main body case 8.

By rotating the A-axis motor 9, B-axis motor 10, and C-axis motor 11 as described above, the nozzle body 27 can be freely rotated in the A-axis, B-axis, and C-axis directions. The nozzle body 7 can be positioned freely by inputting command values directly to the motors 9 to 11 for each axis.

For example, a three-dimensional workpiece 3 as shown in Figure 3
When machining, if there are variations in the dimensional accuracy of the workpiece 3 and the workpiece 3 is processed while being corrected in the C-axis direction, conventionally the correction values are distributed in the X, Y, and Z-axis directions and the nozzle body 27 is moved in the C-axis direction. When the A-axis motor 9 is rotated in order to rotate the B-axis and C-axis drive shafts 20 supported by the drive shaft 15,
33 are also rotated together.

Next, in order to rotate the nozzle body 27 in the direction of the B axis,
When the axis motor 10 is rotated, the rotation of the B-axis motor 10 is transmitted to the B-axis drive shaft 20, and it is necessary to further correct the B-axis interlocking, but according to this invention,
Since the correction can be performed by directly inputting the correction value to the C-axis motor 11, there is no need for complicated calculation processing of the correction value.

This also improves electrical responsiveness.

Effects of the invention As detailed above, this invention has an A-axis motor,
By inputting command values directly to the B-axis motor and C-axis motor, the nozzle body can be rotated in the A-axis, B-axis, and C-axis directions, eliminating the need for conventional 3-axis calculation processing. Become. This improves electrical response errors and minimizes mechanical backlash, thereby improving positioning accuracy.

In addition, the structure of the wrist part can be simplified compared to conventional ones, and since there is no protruding part, machining can be performed closer to the workpiece, which expands the machining range and also causes problems due to wiring cables getting tangled. There is no possibility that it will cause

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, and FIG. 1 is an overall view, FIG. 2 is a sectional view of the wrist, FIG. 3 is an explanatory view of the operation, and FIG. 4 is an explanatory view of the conventional device. 8 is the case body, 9 is the A-axis motor, 10 is the B-axis motor, 11 is the C-axis motor, 15 is the A-axis drive shaft,
20 is a B-axis drive shaft, 33 is a C-axis drive shaft, and 27 is a nozzle body.

Claims (1)

[Scope of utility model registration request] A which rotates the nozzle body 27 in the A-axis direction by being driven by the A-axis motor 9 provided in the main body case 8.
The nozzle body 27 is rotated by the shaft drive shaft 15 and the B-axis motor 10 rotatably supported by the A-axis drive embodiment 15 and attached to the A-axis drive shaft 15 side, so that the nozzle body 27 is orthogonal to the A-axis. A B-axis drive shaft 20 that rotates in the B-axis direction, and a C-axis drive shaft that is supported by the B-axis drive shaft 20 and attached to the B-axis drive shaft 20 side.
A laser processing machine comprising a nozzle device including a C-axis drive shaft 33 that is rotated by a shaft motor 11 and moves the nozzle body 27 to the C-axis that coincides with the optical axis.