JPH069780U - Processing head of laser processing machine - Google Patents

Abstract

(57) [Summary] [Structure] The nozzle 7 can be moved up and down with respect to the main body 6, and can be moved up and down with respect to the main body 6 by the adjusting mechanism 17. The adjusting mechanism 17 includes a female screw portion 7a provided on the nozzle 7, a screw shaft 15 screwed through the female screw portion 7a, and a motor 16 interlocked with the screw shaft 15.
It consists of and. [Effect] When the body 6 is moved up and down to change the focal position of the condenser lens 5, the height of the nozzle 7 is adjusted by the adjusting mechanism 17 so that the workpiece 4 and the lower end of the nozzle 7 are adjusted. The distance from 7b can be kept constant. Since a lock mechanism for fixing the nozzle 7 to the main body portion 6 is not required, it is possible to provide a machining head having a simple structure and high versatility as compared with the conventional case in which such a lock mechanism is provided.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to improvement of a processing head of a laser processing machine.

[Prior art]

 Conventionally, as a processing head of a laser processing machine, a main body that houses a condenser lens that condenses a laser beam and a main body provided below the main body along the optical axis of the laser beam are provided. Equipped with a nozzle capable of relative displacement with respect to the workpiece, and an elevating mechanism for raising and lowering the main body with respect to the workpiece, and irradiating the workpiece with the laser beam condensed by the condenser lens to the workpiece. It is known that a desired laser processing is performed (for example, Japanese Patent Publication No. 2-57478). In the device of the above publication, the nozzle is biased downward by a spring with respect to the main body, and a lock / unlock mechanism is provided so that the nozzle can be fixed at a required position on the main body. With the apparatus of the above publication, by adopting such a configuration, the distance between the nozzle and the workpiece can be maintained constant even if the height position of the condenser lens during laser processing is changed. The versatility of the head can be improved.

[Problems to be solved by the device]

 However, in the apparatus of the above-mentioned publication, in order to fix the nozzle to the main body, it was necessary to provide a lock / unlock mechanism below the main body, so that the structure of the processing head was complicated.

[Means for Solving the Problems]

 In view of the above-mentioned circumstances, the present invention has a main body that houses a condenser lens that collects a laser beam, and a main body provided below the main body along the optical axis of the laser beam. A relatively displaceable nozzle and an ascending / descending mechanism for moving the main body part up and down with respect to the work piece are provided, and the work piece is irradiated with the laser beam condensed by the condenser lens. In a processing head of a laser processing machine for performing required laser processing, an adjusting mechanism is provided for adjusting the distance between the lower end of the nozzle and the workpiece by moving the nozzle relative to the main body. A drive source provided in the main body section and an operating section provided in the nozzle and operated in conjunction with the drive source.

[Action]

 With such a configuration, when changing the focal position of the condenser lens, the elevating mechanism may elevate the main body itself with respect to the workpiece. Further, at that time, if the nozzle is moved relative to the main body by the adjusting mechanism, the distance between the lower end of the nozzle and the workpiece can be kept constant. On the other hand, when changing the positions of the lower end of the nozzle and the work piece while maintaining the focal position of the condenser lens at the predetermined position, that is, while maintaining the main body at the predetermined position, the adjustment mechanism described above is used. It is sufficient to move the sledge relative to the main body. Since the adjusting mechanism is configured as described above, the lock and unlock mechanism, which is required in the conventional device, can be omitted. Therefore, it is possible to provide a processing head having a simple structure and high versatility as compared with the conventional one.

【Example】

 The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, reference numeral 1 is a processing head of a laser processing machine, and the processing head 1 is mounted vertically downward on a movable frame (not shown). By moving the movable frame in the X direction, the processing head 1 can also move in the X direction. The processing head 1 is provided to be movable up and down with respect to the movable frame, and is moved up and down by an elevating mechanism 2 described later to be stopped at a predetermined height position. This makes it possible to adjust the focal position of the condenser lens 5 when the workpiece 4 on the processing table 3 is irradiated with the laser beam L. Since the processing table 3 on which the workpiece 4 is placed can be moved in the Y direction orthogonal to the X direction, by moving the processing table 3 and the processing head 1 in the XY directions relative to each other, The required laser processing such as cutting and punching can be performed on the object 4. The processing head 1 is provided with a cylindrical main body portion 6 provided on the movable frame so as to be able to move up and down, and a nozzle 7 slidably fitted to the lower inner circumference of the main body portion 6, and the main body portion is provided. The condensing lens 5 is fixedly provided on the inner peripheral portion of the upper portion of 6. The axis of the condenser lens 5 fixed to the main body portion 6 is made to coincide with the optical axis of the laser beam L. A female screw portion 6a protruding from the side surface of the main body portion 6 is threadedly penetrated with a screw shaft 8 directed vertically downward. This screw shaft 8 is attached to the movable frame to form a first motor 9 attached thereto. Is linked to. The female screw portion 6a, the screw shaft 8 and the first motor 9 constitute the lifting mechanism 2. Therefore, when the first motor 9 is actuated, the screw shaft 8 rotates in the forward and reverse directions, and the main body portion 6 can be moved up and down. As a result, the condenser lens 5 held in the main body portion 6 can be moved along the optical axis of the laser beam L, and the focal position of the condenser lens 5 is processed such as the plate thickness and material of the workpiece 4. It can be changed according to the conditions. Further, a touch sensor 10 is attached to the lower outer peripheral portion of the main body portion 6, and by bringing the lower end portion of the touch sensor 10 into contact with the workpiece 4 on the machining table 3, the touch sensor 10 and the workpiece 4 are brought together. The distance from the optical lens 5 can be detected. The distance between the condenser lens 5 and the workpiece 4 detected by the touch sensor 10 is converted into a signal, which is then transmitted to the control device 11 described later. Further, an end portion of the gas supply pipe 12 is connected to a required position of the main body portion 6 so that when the workpiece 4 is laser-processed, the gas supply pipe 12 is used to insert the gas into the main body portion 6. The cyst gas is supplied and the assist gas is supplied from the lower end opening of the nozzle 7 to the processed portion of the workpiece 4. Next, the nozzle 7, which is provided in the main body 6 so as to be able to move up and down, has a female screw portion 7a projectingly provided on the outer peripheral portion thereof. I am passing it. The screw shaft 15 is interlocked with a second motor 16 attached to the main body 6. The female screw portion 7a, the screw shaft 15 and the second motor 16 constitute an adjusting mechanism 17 for adjusting the height of the nozzle 7. Therefore, when the second motor 16 is operated, the screw shaft 15 rotates in the forward and reverse directions, and the nozzle 7 can be moved up and down with respect to the main body portion 6. The lower end portion 7b of the nozzle 7 and the workpiece 4 are You can adjust the interval. Next, the control device 11 will be described. In the control device 11 of the present embodiment, the distance between the first setting portion 11a for setting the focal position of the condenser lens 5, the lower end portion 7b of the nozzle 7 and the workpiece 4 is set. It comprises a second setting unit 11b for setting the above, a first control unit 11c for controlling the elevating mechanism 2, and a second control unit 11d for controlling the adjusting mechanism 16. The first setting unit 11a is for setting the focus position of the condenser lens 5 when performing laser processing on the workpiece 4, and more specifically, a position 1 mm above the surface of the workpiece 4, or When data about the focus position with respect to the surface of the workpiece 4 is input, such as the inside of the workpiece 4 located 1 mm below the surface of the workpiece 4, the data is converted into a signal. And is transmitted to both control units 11c and 11d. The second setting portion 11b is for setting the distance between the lower end portion 7b of the nozzle 7 and the workpiece 4, and the required size from the surface of the workpiece 4 to the lower end portion 7b of the nozzle 7 is input. Then, the input data is converted into a signal and transmitted to the second controller 11d. Next, the first control unit 11c receives a signal regarding the distance between the workpiece 4 and the condenser lens 5 detected by the touch sensor 10, and at the same time, outputs the signal from the touch sensor 10 and the first setting unit 11a. By comparing with the signal related to the focus position transmitted from, the elevation amount for raising and lowering the main body portion 6 is calculated, and the first motor 9 of the elevation mechanism 2 is rotated forward and backward by the required amount based on the calculation result. Let As a result, the focusing lens 5 held by the main body 6 is stopped at a height position where the focal position thereof coincides with the data input to the first setting unit 11c. As described above, when the main body 6 holding the condenser lens 5 stops at the predetermined position by the first controller 11c, the data regarding the stop position of the main body 6 is converted into a signal, and the first controller 11c outputs the data. 2 is transmitted to the control unit 1 1d. When the second control unit 11d receives the signal regarding the position of the condenser lens 5 whose adjustment by the elevating mechanism 2 is completed from the first control unit 11c, the second control unit 11d has already received the signal from the second setting unit 11b. The lower controller 7b of the nozzle 7 and the signal relating to the distance between the workpiece 4 are compared with each other, and then the second controller 11d calculates the required amount of elevation of the nozzle 7 with respect to the main body 6, and based on the calculation result. Then, the second motor 16 of the adjusting mechanism 17 is rotated forward and backward by a required amount. As a result, the nozzle 7 is moved up and down with respect to the main body portion 6 and then stopped, so that the distance between the lower end portion 7b of the nozzle 7 and the workpiece 4 is adjusted to the distance input to the second setting portion 11b. (Operation) In the above configuration, when performing laser processing on the workpiece 4, the focus position of the condenser lens 5 is lowered by, for example, 1 mm while keeping the distance between the lower end 7b of the nozzle 7 and the workpiece 4 constant. When it is necessary to do so, the data regarding the focal position of the condenser lens 5 to that effect is input to the first setting unit 11a. As a result, the first controller 11c controls the elevating mechanism 2 to lower the main body 6 by 1 mm according to the procedure described above. Therefore, the focal position of the condenser lens housed in the main body 6 can be lowered by 1 mm. Since the first controller 11c informs the second controller 11d that the body 6 has descended by 1 mm, the second controller 11d thereafter controls the adjusting mechanism 17 to raise the nozzle 7 by 1 mm. . As a result, the focus position of the condenser lens 5 can be lowered by 1 mm, and the distance between the workpiece 4 and the lower end 7a of the nozzle 7 can be maintained constant. On the other hand, when it is desired to change the positions of the lower end portion 7b of the nozzle 7 and the workpiece 4 while maintaining the focal position of the condenser lens 5 at a predetermined position, that is, while maintaining the main body portion 6 at a predetermined height. When new data regarding the distance between the lower end 7b of the nozzle 7 and the workpiece 4 is input to the second setting unit 11b, the second control unit 11d controls the adjusting mechanism 17 to move the nozzle 7 up and down. Then, the nozzle 7 is positioned at a required height position. According to this embodiment as described above, the focal position of the condenser lens 5 and the distance between the lower end portion 7b of the nozzle 7 and the workpiece 4 are adjusted according to the processing conditions such as the plate thickness of the workpiece 4, the material, and the like. Since it can be adjusted, it is possible to provide a highly versatile processing head. Further, in this embodiment, since the condenser lens 5 is fixedly provided in the body portion 6, it is assumed that the body portion 6 is moved up and down in order to change the focal position of the condenser lens 5 as described above. Also, the axis of the condenser lens 5 and the optical axis of the laser beam L do not deviate. In contrast to the present embodiment, in the conventionally known processing head, the condenser lens 5 is held by a cylindrical holder, and the holder is axially moved to the inner peripheral surface of the main body portion 6. It was possible. In such a conventional device, when changing the focal point position of the condenser lens 5, the holder is moved relative to the main body section 6. Therefore, after the adjustment of the focal point position, the main body section 6 and the holder section are moved. Due to the gap between and, the optical axis of the laser beam L and the axis of the condenser lens 5 are deviated from each other. Further, in this embodiment, since the adjusting mechanism 17 is configured as described above, it is not necessary to provide a lock / unlock mechanism for fixing the nozzle 7 to the main body portion 6, and such a mechanism is not necessary. The configuration of the processing head 1 can be simplified as compared with the required conventional one. Instead of the touch sensor 10, a capacitance sensor, a magnetic sensor, an optical sensor, etc. may be used. A rack and a pinion may be used instead of the configuration of the screw shaft 15 and the female screw portion 7a.

[Effect of device]

 As described above, according to the present invention, it is possible to provide a processing head having a simple structure and high versatility as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Processing Head 2 Elevating Mechanism 4 Workpiece 5 Condenser Lens 6 Main Body 7 Nozzle 7a Female Screw Part (Operating Part) 15 Screw Shaft 16 Motor (Drive Source) 17 Adjustment Mechanism

Claims (1)

[Scope of utility model registration request] 1. A main body containing a condenser lens for condensing a laser beam, and a nozzle provided below the main body and capable of relative displacement with respect to the main body along the optical axis of the laser beam. And a raising / lowering mechanism for raising / lowering the main body part with respect to the workpiece, and irradiating the workpiece with the laser beam condensed by the condenser lens to perform the required laser processing on the workpiece. In the processing head of the laser processing machine, an adjustment mechanism is provided for moving the nozzle relative to the main body to adjust the distance between the lower end of the nozzle and the workpiece,
A processing head of a laser beam machine, wherein the adjusting mechanism includes a drive source provided in the main body section, and an operating section provided in the nozzle and operated in conjunction with the drive source.