JP2007041558A - Microscope for laser welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microscope for laser welding, capable of protecting eyes from an intense light, such as flashes and plasma generated during laser welding, and confirming a welding part with naked eyes by magnifying it in real time. <P>SOLUTION: The microscope comprises an eyepiece which is fitted inside the body for adjusting the magnification of an object to be observed; a correction prism which is fitted below the eyepiece for performing the correction so that the object is seen as one object; an object lens for adjusting the focal length of the eyepiece so that the object is seen within the focused range of an observer; an LC shutter for shielding the object lens, when infrared flash is generated, and at the completion of the welding, releasing the object lens to show the state of the welding of the object in real time; a filter lens for shielding against infrared flashes generated during laser welding; a total reflection lens which is fitted below the filter lens for shielding against harmful wavelengths; and a safety glass for protecting the total reflection lens against welding cracks. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a laser welding microscope capable of enlarging and confirming a welding site in real time with a laser welding machine (Laser Welding Apparatus), and more specifically, from a powerful light such as a flash or plasma generated during laser welding. The present invention relates to a laser welding microscope that can be confirmed with the naked eye with high precision by expanding the welding situation in real time while protecting the eyes of the operator.

  In addition, the present invention provides a precise state in which laser welding is performed in real time in a state where it can be freely moved and detached regardless of the location and the form (size, shape, etc.) of the target object. The present invention relates to a laser welding microscope that enables welding to be confirmed in real time.

  In general, there are various welding methods, but in recent years, laser welding is often used instead of spot welding.

  Unlike the contact spot welding machine, which applies electricity to the object to be welded and contacts the welding head for welding, the laser welding machine is for achieving non-contact type high-speed welding. In a welding machine, a laser beam oscillated from an oscillator is irradiated onto an object to be welded through an output adjustment lens and a number of prisms in a welding head that contains both the oscillator and other necessary components. The laser beam output at the time of welding can be adjusted by changing the angle of the output adjusting lens with respect to the traveling axis of the laser beam.

  When a welding object is welded by applying a laser beam through such a non-contact type laser welding machine, powerful light such as flash light or plasma is generated. In particular, in the laser welding machine that performs precise welding by emitting one to several tens of beams per second, the operator cannot perform welding while checking the welding site with the naked eye by powerful light.

  Therefore, in recent years, welding confirmation devices for confirming the presence or absence of welding during laser welding in an automated production line have been developed and commercialized.

  The welding confirmation device is connected to the output side to connect a contact when laser welding is performed and outputs a switching signal, and a signal output from the relay switch is applied to display the number of welding times to an operator. Such a welding confirmation device is provided in each automated production line and is attached to a robot that automatically performs laser welding according to a set program, so that only the number of times the welding has been performed can be obtained. This is to inform the worker.

  However, since the welding confirmation device as described above displays only the number of times welding has been performed when the robot performs spot welding or laser welding in an automated production line, the robot can perform good welding on the object to be welded. As a result, the operator cannot know whether or not the welding is being performed, and after the robot has completed welding to a large number of welding objects, the operator visually confirms the welding parts of the welding objects one by one. When bad welding occurs, there is an inconvenience that it is necessary to re-weld the robot again, and the welded part is not neatly welded by re-welding the welding object. There is a problem that the welded part of the steel is damaged.

  In particular, when precision welding is performed manually with a laser welding machine without using a robot, the welding site is precisely and visually observed while the welding is performed by powerful light such as flash light and plasma generated by the operator. Since it cannot be confirmed, it is necessary to visually check the welded part of the object to be welded after welding is completed, and perform laser welding on the defective welded part and re-welding while repeating the confirmation process. This is not only an obstacle to the achievement of non-contact type super-high-speed welding, which is an advantage of welding, but also because it cannot be confirmed while welding, and there is a problem that precise welding cannot be performed, resulting in irregular welding. .

  From the above viewpoints, the above-mentioned problems are solved, and a low-cost laser welding microscope is provided from the viewpoint of cost. From the viewpoint of reliability, the operator's eyes are protected from flash light and plasma. There is a need for a laser welding microscope capable of confirming the welding state with the naked eye in real time.

  Accordingly, an object of the present invention is to provide a laser welding microscope capable of checking the welding state with the naked eye in real time while protecting an operator's eyes from powerful light such as flash light and plasma generated during laser welding. Is to provide.

  Another object of the present invention is laser welding which can confirm the welding state in real time in a state where movement and deattachment are free regardless of the location and the size and shape of the target object during laser welding. It is to provide a microscope for use.

  The objects of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

  The laser welding microscope according to the present invention for achieving the above-described object includes a pair of main bodies and a vertical movement inside one side of the main body so that the target object can be confirmed with both eyes. An eyepiece that can be attached and adjusts the magnification of the target object, and is attached to the lower part of the eyepiece inside the main body, according to the distance between the eyes of the person viewing the eyepiece. A pair of prisms for allowing the target object to be seen as one, and a focal length that is attached to the lower part of the pair of prisms so that the target object can be seen within the focal range of the person viewing the eyepiece An objective lens that adjusts the light intensity, and is provided below the objective lens. When an infrared flash is generated by the emission of a laser beam, the objective lens is primarily cut off and blocked. After the completion of welding, the objective lens is opened and an LC shutter that shows the welding state of the target object in real time is provided, and the infrared flash generated at the time of laser welding is secondarily cut off. A filter lens for preventing glare, a total reflection lens provided on a lower surface of the filter lens and coated with a reflection member on the surface, for blocking harmful wavelengths generated from a laser beam, and the total reflection lens And a safety glass that safely protects the total reflection lens from weld cracks generated during laser welding.

  Preferably, one end is coupled to the outer surface of the main body so that the focal length between the main body and the target object can be easily adjusted and matched, and a power supply cable is accommodated inside. The flexible arm and the other end of the flexible arm are rotatably inserted, and the magnet is detached and attached to a metal plate or the like so that the flexible arm can be fixed or moved in the radial direction by tightening or releasing the adjusting screw. A base; and a halogen lamp attached to one end of the flexible arm and configured to emit light to the target object by power supplied from a power supply cable in the flexible arm.

  Optionally, the pair of prisms preferably have a triangular cross section, are arranged in opposite directions and are arranged so as to be displaced from each other to the left and right.

  According to the present invention, when laser welding is performed, each time a laser beam is emitted, the LC shutter is closed to temporarily block powerful light such as flash light and plasma, and infrared light flash can be transmitted through a filter lens. Secondarily blocks harmful wavelengths. When the laser beam is emitted, the LC shutter can be opened and the welded state can be enlarged and confirmed in real time via a binocular eyepiece.

  Therefore, the welded part can be checked with the naked eye in real time while protecting the eyes from the powerful flash generated during laser welding. In particular, precise welding is possible when manual welding is performed, as well as movement and desorption. Since it can be done freely, it has the advantage that it is independent of the welding location and the size and shape of the welding object.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted. The objects, features and advantages of the present invention will become more apparent from the following description of embodiments.

  FIG. 1 is a configuration diagram schematically showing a laser welding microscope attached to a flexible arm of a laser welding machine according to the present embodiment, and FIG. 2 is an enlarged configuration of the laser welding microscope shown in FIG. FIG.

  As shown in FIGS. 1 and 2, the laser welding microscope according to the present embodiment includes a pair of a main body 101 and a single body 101 so that a target object can be confirmed with both eyes. An eyepiece lens 111 that is movably mounted on the inside of the side and adjusts the magnification of the target object; and a human eye that is attached to the lower part of the eyepiece lens 111 in the main body 101 and looks at the eyepiece lens 111. A pair of prisms 112 and 112a for correcting the target object to be seen as one according to the distance between the eyes and the lower part of the pair of prisms 112 and 112a, and viewing the eyepiece 111 An objective lens 113 that adjusts a focal length so that the target object can be seen within a human focal range; When an infrared flash is generated by the emission of a beam, the objective lens 113 is temporarily cut off and blocked, and after completion of laser welding, the objective lens 113 is opened to show the welding state of the target object in real time. A shutter 114, a filter lens 115 provided below the LC shutter 114, and secondarily blocking the infrared flash generated during laser welding to prevent glare, and provided below the filter lens 115; The surface is coated with a reflecting member, and is provided at a total reflection lens 116 for blocking harmful wavelengths generated from the laser beam, and at the lower part of the total reflection lens 116, and the total reflection from a weld crack generated at the time of laser welding. And safety glass 117 that protects the lens 116 safely.

  Also, one end is coupled to the outer surface of the main body 101 so that the focal length between the main body 101 and the target object can be easily adjusted and matched, and a power supply cable 104 is provided inside. The accommodated flexible arm 102 and the other end of the flexible arm 102 are rotatably inserted, and the flexible arm 102 can be removed from a metal plate or the like so that the flexible arm 102 can be fixed or moved in a radial direction by tightening or releasing the adjusting screw. A magnet base 103 to be attached, a halogen lamp 105 attached to one end of the flexible arm 102 and radiating light to the target object by the power supplied from the power supply cable 104 in the flexible arm 102; Is further provided.

  Hereinafter, the laser welding microscope according to the present embodiment having such a configuration will be specifically described with reference to FIGS. 1 and 2.

  First, as shown in FIG. 2, the microscope according to the present embodiment is arranged in the main body 101 and sees a target object through an eyepiece 111 having binoculars.

  The eyepiece 111 adjusts the magnification of the target object, and can be magnified by 10 times, 16 times, 20 times, 40 times, etc., and the magnification of the target object can be adjusted up and down. You can choose.

  Further, the pair of prisms 112 and 112a attached to the inside of the main body 101 has a difference in distance between eyes depending on a person, and is for correcting this difference. That is, the correction is made so that the target object is clearly seen as one according to the distance between both eyes by a pair of prisms. The pair of prisms 112 and 112a are triangular in cross section, and are disposed in opposite directions and so as to be displaced from each other to the left and right.

  The objective lens 113 attached to the lower part of the pair of prisms 112 and 112a allows the target object to be seen within the focal range of the person viewing the eyepiece lens 111. As the objective lens 113, an objective lens having a focal length of 100 mm, 120 mm, 150 mm, 200 mm or the like can be selected and used as necessary.

  The LC shutter 114 attached to the lower part of the objective lens 113 is repeatedly closed and opened by a synchronized signal voltage every time a laser beam is generated from the laser welding machine, and when a flash is generated, that is, the laser beam is emitted. In the meantime, the LC shutter 114 is closed to protect the eyes, and when the laser beam is emitted, the LC shutter 114 is opened by the synchronized voltage, so that the welding state of the target object after welding is continued at a high speed. Thus, it can be seen through the objective lens 113.

  The filter lens 115 provided below the LC shutter 114 serves to protect the eyes from glare by secondarily blocking the infrared flash generated during laser welding.

  The total reflection lens 116 provided below the filter lens 115 is coated with a reflection member on the surface, and serves to totally reflect and block harmful wavelengths (1064 nm) generated from the laser beam. If harmful rays of the laser wavelength enter the eye, there is a risk of blindness. Therefore, it is necessary to provide a total reflection lens 116 coated with a reflecting member.

  The safety glass 117 provided below the total reflection lens 116 is used to safely protect the total reflection lens 116 from welding cracks during laser welding.

  In the laser welding microscope according to the present embodiment, as shown in FIG. 1, the flexible arm 102 having one end coupled to the outer surface of the main body 101 and accommodating the power supply cable 104 therein, Since it has a bellows shape that can be freely bent, the focal length between the main body 101 and the target object can be easily adjusted.

  Also, the other end of the flexible arm 102 is rotatably inserted into the magnet base 103 and fixed to the magnet base 103 by tightening and releasing an adjusting screw (not shown), or a radius to the left and right around the magnet base 103. Since the movement is possible, the focal length can be adjusted regardless of the position of the target object.

  In addition, the magnet base 103 connected to the other end of the flexible arm 102 can be easily detached and attached to a metal plate or the like by a magnetic force, so that there is no restriction on the location, size and shape of the target object. It can be installed easily.

  A halogen lamp 105 attached to the flexible arm 102 and connected to a power supply cable 104 in the flexible arm 102 serves as an illumination lamp for identifying the target object.

  Unlike the conventional technique, which is a comparative example, that is, a method in which an operator needs to visually check the welded part of a welding object after welding is completed, in this embodiment, Each time welding is performed, the LC shutter is closed with a signal synchronized with the laser beam firing speed to shut off the powerful flash light, and when the laser beam is fired, the LC shutter is opened to show the welding state after welding in real time. It can be seen that it can be enlarged.

  Therefore, according to the present embodiment, the eye can be protected from a powerful flash generated during laser welding, and the welding state can be enlarged and confirmed through a microscope in real time. In addition to being able to perform precise welding, it can be moved and detached freely, so there is an advantage that it is independent of the welding location and the size and shape of the welding object.

  Although the preferred embodiments of the present invention have been described with reference to the drawings, the protection scope of the present invention is not limited to the above-described embodiments, and the invention described in the claims and its It extends to the equivalent. Therefore, the present invention can be variously modified and implemented without departing from the scope of the present invention. That is, it is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to the range.

  According to the laser welding microscope of the present invention, during laser welding, every time a laser beam is emitted, the LC shutter is closed to temporarily block powerful light such as flash light and plasma, and through a filter lens. By blocking the harmful wavelengths of infrared flashes secondarily, it is possible to protect the eyes of the worker and to accurately check the welding state through a microscope in real time.

  In addition, there is an effect that the state of super-precision welding in real time can be confirmed accurately and in real time in a state where movement, removal, and adhesion are free regardless of the location and the size and shape of the welding object.

It is explanatory drawing which shows schematically the microscope for laser welding attached to the flexible arm of the laser welding machine which concerns on one Embodiment of this invention. It is explanatory drawing which expands and shows the microscope for laser welding of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Main body 102 Flexible arm 103 Magnet base 104 Power supply cable 105 Halogen lamp 111 Eyepiece lens 112 Prism 113 Objective lens 114 LC shutter 115 Filter lens 116 Total reflection lens 117 Safety glass

Claims (4)

A body consisting of a single unit so that the target object can be confirmed with both eyes,
An eyepiece which is attached to one side inside the main body so as to be movable up and down and adjusts the magnification of the target object;
A pair of prisms attached to the lower part of the eyepiece inside the main body and configured to allow the target object to be seen as one according to the distance between the eyes of a person viewing the eyepiece;
An objective lens that is attached to the lower part of the pair of prisms and adjusts a focal length so that the target object can be seen within a focal range of a person viewing the eyepiece;
Provided under the objective lens, when an infrared flash is generated by laser beam emission, the objective lens is temporarily cut off and blocked, and after completion of laser welding, the objective lens is opened to weld the target object. LC shutter that shows the status in real time,
A filter lens provided under the LC shutter to prevent glare by secondarily blocking the infrared flash generated during laser welding;
A total reflection lens which is provided at the lower part of the filter lens and whose surface is coated with a reflection member and which blocks harmful wavelengths generated from the laser beam;
A safety glass provided at a lower portion of the total reflection lens and protecting the total reflection lens from weld cracks generated during laser welding;
A laser welding microscope characterized by comprising: One end is coupled to the outer surface of the main body so that the focal distance between the main body and the target object can be adjusted and adjusted, and a flexible arm that accommodates a power supply cable is disposed inside. ,
A magnet base that is rotatably inserted at the other end of the flexible arm, and is attached to and detached from the metal plate so that the flexible arm can be fixed or moved in a radial direction by tightening or releasing an adjustment screw;
A halogen lamp that is attached to one end of the flexible arm and emits light to the target object by power supplied from a power supply cable in the flexible arm;
The laser welding microscope according to claim 1, further comprising:   The laser welding microscope according to claim 1, wherein the pair of prisms has a triangular cross section.   4. The laser welding microscope according to claim 3, wherein the pair of prisms are arranged in directions opposite to each other and are shifted from each other to the left and right.

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