JP2014237149A - Laser processing head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser processing head device in which when a laser processing head collides with an obstacle, a shear member is broken thereby protecting the laser processing head.SOLUTION: A laser processing head device comprises a laser processing head which is detachably provided to a carriage movable in X-, Y- and Z-axis directions relatively to a work-piece. A top face of a processing head body 9 in a laser processing head 7 is brought into contact with an inferior surface of a base member 5 provided to the carriage 3. Plural support members 21, which so penetrate through vertical direction open holes 19 provided on plural portions of the base member 5, are provided on the top face of the processing head body 9, a shear member 25, which has a diameter smaller than that of the support member 21, is provided to an upper part of the support member 21, and an elastic member 31 is provided between an upper part of the shear member 25 and the base member 5. The support 21 is equipped with an open hole 23, and the shear member 25 is detachably screwed into the open hole 23 from the upper part thereof.

Description

  The present invention relates to a laser processing head device in a laser processing device, and more particularly to a laser processing head device of a type in which a shear member is damaged and absorbs an impact when the laser processing head collides with an obstacle.

  Conventionally, in a laser processing apparatus, cutting of a workpiece is performed in a state where a plate-like workpiece is horizontally supported on a processing pallet. The processing pallet is generally configured to include a plurality of swords and skids that support a workpiece. When the workpiece on the machining pallet is cut, a cut piece cut and separated from the workpiece may fall between the hills and tilt. In this case, if the inclined upper end of the cutting piece protrudes from the upper surface of the workpiece, the lower part of the laser processing head in the laser processing head device may collide with the cutting piece and be damaged.

  Therefore, it is attempted to protect the laser processing head when the laser processing head comes into contact with the cut piece (see, for example, Patent Documents 1, 2, and 3).

JP-A-4-351273 Japanese Utility Model Publication No. 5-65490 JP 7-178546 A

  In each configuration described in Patent Documents 1 to 3, when the laser processing head collides with an obstacle, the laser processing head is inclined against the biasing force of the spring supporting the laser processing head and the magnet's adsorption force. This reduces the impact at the time of collision. When the inclination of the laser processing head is detected by the sensor, the movement of the laser processing head is stopped. The subsequent return of the laser processing head to the original state is performed by the biasing force of the spring or the attractive force of the magnet.

  Therefore, by removing the obstacle with which the laser processing head collided, the laser processing head is naturally returned to the original state. In this configuration, when the laser processing head is relatively separated from the obstacle in order to remove the obstacle, the laser processing head is returned to the original state. Therefore, in the configuration as described above, the machining head is held so as not to oscillate even when the laser machining head is accelerated / decelerated, and is easily oscillated (tilted) when the laser machining head collides with an obstacle. In addition, there is a problem that it is difficult to adjust the urging force of the spring to an appropriate value.

  Incidentally, FIG. 2 and the corresponding text in Patent Document 2 describe a configuration in which a shear pin is damaged and the laser processing head is protected when the laser processing head comes into contact with an obstacle. According to this configuration, by setting the diameter of the constricted portion in the shear pin to a desired diameter, the shear pin can be damaged when an impact force of a predetermined level or more is applied to the laser processing head. That is, in the configuration using the shear pin, it is easy to adopt a configuration in which the shear pin is damaged when an impact force of a predetermined level or more is applied to the laser processing head.

  In the above configuration, it is necessary to prepare in advance a plurality of shear pins that are damaged when a predetermined impact force is applied. In some cases, the shear pin has to be prepared in advance, and there is a problem that the components are expensive.

  The present invention has been made in view of the above-described problems, and is a laser processing head device in which a laser processing head is detachably attached to a carriage that can move relative to a workpiece in the X, Y, and Z axis directions. The upper surface of the processing head body of the laser processing head is in contact with the lower surface of the base member provided in the carriage, and vertically penetrates through holes in the vertical direction provided in a plurality of locations of the base member. A plurality of support members are provided on the upper surface of the processing head main body, a shear member having a smaller diameter than the support member is provided on the upper portion of the support member, and an elastic member is provided between the upper portion of the shear member and the base member. It is characterized by that.

  Further, in the laser processing head device, the support member has a through hole, and the shear member is detachably screwed into the through hole from above.

  In the laser processing head device, a pipe member surrounding the shear member is provided between a flange member provided on an upper portion of the shear member and the support member.

  In the laser processing head device, a convex portion or a concave portion that can be engaged with an engaging concave portion or a convex portion provided at the center of the lower surface of the base member is provided at the center of the upper surface of the processing head main body. Is.

  In the laser processing head device, the shear member is a screw member.

  According to the present invention, the upper portion of the support member provided on the upper surface of the processing head main body in the laser processing head is provided with a shear member having a smaller diameter than the support member, and the upper portion of the shear member and the base through which the support member passes. Since the elastic member is provided between the elastic member and the member, when the lower part of the laser processing head collides with an obstacle, the elastic member is deformed and stress is concentrated on the connecting portion between the support member and the shear member. Thus, the shear member is easily broken.

  Therefore, when an impact force of a predetermined value or more acts on the laser processing head, the shear member is damaged, and the laser processing head can be reliably protected.

1 is a perspective explanatory view conceptually and schematically showing a laser processing head device according to an embodiment of the present invention. It is explanatory drawing which shows the attachment structure of the process head main body with respect to a carriage. It is explanatory drawing which shows the state which a process head main body collides with a workpiece | work and a shear member is damaged.

  Referring to FIG. 1, a laser processing head device 1 according to an embodiment of the present invention is used by being mounted on a laser processing device (not shown). The laser processing device includes X, Y, and Z axes. A carriage 3 is provided so as to be movable in the direction. There are various configurations for moving the carriage 3 relative to the workpiece in the X, Y, and Z-axis directions. Since the configuration is well known in laser processing apparatuses, the carriage 3 is moved. A detailed description of the configuration is omitted.

  A base member 5 is integrally provided on the carriage 3, and the upper surface of the processing head main body 9 of the laser processing head 7 is in contact with the lower surface of the base member 5. More specifically, a vertical through hole 11 is formed in the center of the base member 5, and a protective tube member 13 (see FIG. 2) connected to the processing head body 9 is formed in the through hole 11. (Not shown) penetrates. The protective tube member 13 serves to protect a part of the optical path of laser light from a laser oscillator (not shown) to a condenser lens (not shown) provided in the processing head body 9.

  A circular engagement recess 15 is formed on the lower surface of the base member 5 and around the through hole 11. On the upper surface of the processing head main body 9, an engaging convex portion 17 that is detachable from the engaging concave portion 15 is formed. Since the relationship between the engagement concave portion 15 and the engagement convex portion 17 is relative, the engagement concave portion 15 is formed on the upper surface of the processing head main body 9, and the engagement convex portion is formed on the lower surface of the base member 5. The structure which formed 17 may be sufficient.

  In order to keep the upper surface of the processing head main body 9 in contact with the lower surface of the base member 5 and keep the engaging concave portion 15 and the engaging convex portion 17 in an always engaged state, A plurality of through holes 19 in the vertical direction are provided at equal intervals in the circumferential direction. And the lower end part of the supporting member 21 which penetrated each said through-hole 19 so that vertical movement was possible was screwed to the upper surface of the said processing head main body 9 so that attachment or detachment was possible. The support member 21 is formed on a column having a polygonal shape or a part with a flat portion for tool engagement so that it can be easily attached to and detached from the upper surface of the processing head main body 9. A vertical through hole 23 is formed in the axial center portion of the support member 21.

  A lower end portion of a shear member 25 having a smaller diameter than the support member 21 is screwed into the through hole 23 in the support member 21. The shear member 25 is a commercially available machine screw, for example, and can be easily obtained. A pipe member 29 surrounding the shear member 25 is interposed between a flange member 27 such as a spring seat provided on the upper portion of the shear member 25 and the upper surface of the support member 21. An elastic member 31 such as a coil spring is mounted between the flange member 27 and the base member 5.

  With the above configuration, in the laser processing head device 1, the processing head body 9 is supported by the plurality of elastic members 31 biased upward, and the upper surface of the processing head body 9 is in contact with the lower surface of the base member 5. It is in. Then, an engaging convex portion 17 formed on the upper surface of the processing head main body 9 is engaged with an engaging concave portion 15 formed on the lower surface of the base member 5 so that the laser processing head 7 is positioned with respect to the carriage 3. In a broken state.

  When the nozzle or the like provided in the lower part of the machining head main body 9 comes into contact with an obstacle such as the workpiece W during the movement of the laser machining head 7 by the carriage 3, as shown in FIG. Is inclined with respect to the vertical, and the shear member 25 is broken. As described above, when the machining head main body 9 is inclined and the shear member 25 is broken, the inclination of the machining head main body 9 and the breaking of the shear member 25 are detected by an inclination detecting means (not shown) including an appropriate sensor. . The movement of the carriage 3 is stopped by this detection.

  By the way, since the shear member 25 has a smaller diameter than the support member 21 and is screwed to the support member 21, the joint between the support member 21 and the shear member 25 has a step, Stress is concentrated and easily damaged. Since the shear member 25 is a commercially available small-diameter screw, stress concentrates on the screw formation start portion and is easily broken. Therefore, it is easy to obtain the shear member 25 that is easily broken when a predetermined impact force is applied.

  When the shear member 25 breaks as described above, the laser cutting processing of the workpiece W by the laser processing head device 1 is resumed after replacing the new shear member 25 and removing the obstacle that the processing head main body 9 has collided with. Is. By the way, when the broken thread portion of the shear member 25 is screwed into the through hole 23 in the support member 21, the support member 21 is removed from the processing head main body 9 and an appropriate tool is inserted from the lower end side of the through hole 23. insert. Then, the screw portion can be rotated by a frictional force by abutting and pressing on the tip portion of the screw portion of the shearing member 25 where the tip portion of the tool is broken, and rotating in the loosening direction. Can be removed from the support member 21.

  As can be understood from the above description, since the shear member 25 is a commercially available small-diameter screw, it is easy to obtain the shear member 25 having a constant strength. Further, as apparent from the above configuration, since the pipe member 29 is interposed between the support member 21 and the flange member 27, the distance between the base member 5 and the flange member 27 in the carriage 3 is always substantially constant. Can be retained. Therefore, the urging forces of the plurality of elastic members 31 can be kept substantially constant. Therefore, the machining head body 9 can be tilted in response to a substantially constant impact force regardless of the collision direction of the machining head body 9 against the workpiece W.

DESCRIPTION OF SYMBOLS 1 Laser processing head apparatus 3 Carriage 5 Base member 7 Laser processing head 9 Processing head main body 15 Engagement recessed part 17 Engagement convex part 19 Through-hole 21 Support member 23 Through-hole 25 Shear member 27 Flange member (spring seat)
29 Pipe member 31 Elastic member

Claims (5)

  A laser processing head device in which a laser processing head is detachably mounted on a carriage that is movable relative to a workpiece in the X, Y, and Z axis directions, and laser processing is performed on a lower surface of a base member provided in the carriage. The upper surface of the machining head main body is provided with a plurality of support members which are provided in contact with the upper surface of the machining head main body in the head and which are vertically movable through through holes provided in a plurality of locations of the base member. A laser processing head device comprising: a shear member having a smaller diameter than the member at an upper portion of the support member; and an elastic member between the upper portion of the shear member and the base member.   2. The laser processing head device according to claim 1, wherein the support member includes a through hole, and the shear member is detachably screwed into the through hole from above. Processing head device.   3. The laser processing head device according to claim 1, further comprising: a pipe member surrounding the shear member between a flange member provided on an upper portion of the shear member and the support member. Laser processing head device.   4. The laser processing head device according to claim 1, wherein a convex portion or a concave portion that can be engaged with an engaging concave portion or a convex portion provided at the center of the lower surface of the base member is provided at the center of the upper surface of the processing head body. A laser processing head device characterized by comprising:   5. The laser processing head device according to claim 1, wherein the shear member is a screw member.

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