KR20180045418A - Overlay welding automation equipment - Google Patents

Abstract

Disclosed is an automatic overlay welding apparatus, comprising: a manipulator having a vertical guide unit for guiding a vertical motion relative to a ground, and a horizontal guide unit for guiding a horizontal motion perpendicular to the vertical motion; a transfer frame which is movable in a horizontal and vertical direction in a state in which it is supported by the manipulator; a welding unit installed to the transfer frame to perform overlay welding on an object to be welded with a position of the welding unit being adjusted together with the transfer frame; and a positioner for the object to be welded which is disposed away from the manipulator and supports the object to be welded so that a position of the object is changed. It is possible to perform the overlay welding on pipes and plates of various sizes by the dedicated manipulator.

Description

[0001] Overlay welding automation equipment [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus, and more particularly, to an overlay welding automation apparatus capable of more efficiently implementing overlay welding on an inner circumferential surface of a large pipe.

Overlay welding is a method of surface treatment that improves the surface properties of a base material by uniformly welding a welding material made of an alloy excellent in wear resistance, corrosion resistance, and heat resistance to the surface of the base material.

Such overlay welding is a welding method having a thickness of approximately 1 mm to several tens of mm and has many advantages as follows, which is applied to improve the performance of industrial equipment requiring durability, corrosion resistance, abrasion resistance, heat resistance and the like.

For example, the surface properties of the base material can be improved through the deposition of an alloy having abrasion resistance, corrosion resistance and heat resistance, and a surface having higher aggregate strength than the surface of the base material can be obtained, and the size of the base material to be overlaid is not limited.

In addition, since the welding is performed through the metallurgical reaction in the inert gas atmosphere in the slag, the quality is excellent, the surface of the base material with low unit cost can be improved at a small cost, , And special welding materials having physical properties according to the demand of the customer can be welded to make a composite.

However, since the overlay welding is to overlay the welding material on the surface of the base material through the welding process, there is a disadvantage that the dilution of the alloy component by inevitably occurs due to melting and mixing of the base material. It is known that the dilution rate of the bonded material due to such dilution varies up to 40% depending on the welding process conditions.

In order to obtain the maximum abrasion resistance, usually, the overlay layer must be formed in two to three layers. Since the coating of the electrode exists as slag on the surface of the overlay layer, there is a problem that it must be removed between each pass. There is a disadvantage that the shape is limited to cylindrical or flat plates and that it is not suitable for welding a relatively small surface and is not economical. For example, since the bearing for feeding the wire is provided to the welding head, the size is so large that it can not be overlaid on the small diameter pipe.

In addition, overlaying a large area requires preheating, and there is a problem that excessive preheating or a long welding time causes the torch to overheat. Due to the nature of the welding process, the parts used for a long time or the equipment Organic operation between the welding peripheral components and the system under the conditions is essential, so there are many requirements for process limitations.

On the other hand, the technology related to overlay welding in Korea is not high compared to foreign countries, so foreign foreign equipments are imported and used. The domestic reality for the development of welding materials for overlay welding is very difficult, and most domestic welding companies are also importers of foreign welding materials to domestic market, The pace of diffusion of domestic developed products and technology development is very slow progress.

[Related literature]

Korean Patent Publication No. 10-2016-0048460 (overlay welding apparatus)

Korean Patent Publication No. 10-1614286 (Automatic welding apparatus for variable diameter pipe overlay using variable joint

The present invention has been made in order to overcome the above problems, and it is possible to perform overlay welding of pipes and flat plates of various sizes by using a dedicated manipulator, and stable and uniform control using the LM gear and DC motor is performed, And it is an object of the present invention to provide an overlay welding automation apparatus which can easily supply and supply consumables, has excellent price competitiveness compared with foreign equipment, and can easily change the welding method.

According to an aspect of the present invention, there is provided an overlay welding automation apparatus comprising: a manipulator having a vertical guide unit for guiding a vertical movement to a ground; and a horizontal guide unit for guiding horizontal movement orthogonal to the vertical movement; A conveyance frame that is horizontally and vertically moved while being supported by the manipulator; A welding part installed on the transfer frame and positioned together with the transfer frame, for performing overlay welding on the object to be welded; And a welding object positioner spaced apart from the manipulator and supporting the object to be welded in a positionable manner.

The welding object positioner may further comprise: A plurality of rollers mounted on the base frame for supporting a welding object, and a position adjusting unit for adjusting a position of the welding object supported by the rollers.

In addition, the object to be welded is a pipe, and the position adjustment unit includes: And a pipe driving unit having a spindle chuck for fixing one end of the pipe and a pipe rotating motor for rotating the pipe held by the spindle chuck by rotating the spindle chuck.

The position adjustment unit may further include: A semicircular tilting gear provided on the pipe driving unit for vertically tilting the pipe held in the spindle chuck, and a tilting motor for engaging with the tilting gear and angularly moving the tilting gear.

Further, the welding portion may include: An extension rod extended to the inside of the pipe while being supported by the transfer frame, and a welding electrode provided at an extension end of the extension rod and forming an overlay welding layer on the inner circumferential surface of the pipe.

The overlay welding automation apparatus of the present invention as described above can perform overlay welding of pipes and flat plates of various sizes by using a dedicated manipulator and perform stable and uniform control by using the LM gear and the DC motor, Because it is possible to localize it, it is easy to supply and supply consumables, has excellent price competitiveness compared with foreign equipments, and it is easy to change the welding method.

1 is a block diagram showing the structure of an overlay welding automation apparatus according to an embodiment of the present invention.
2 is a block diagram illustrating the overall structure and operation of an overlay welding automation apparatus according to an embodiment of the present invention.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram showing a structure of an overlay welding automation apparatus 11 according to an embodiment of the present invention. 2 is a block diagram illustrating an overall structure and operation of an overlay welding automation apparatus according to an embodiment of the present invention.

Although the overlay welding object is exemplified as a pipe in this embodiment, the type of the overlay welding object can be variously applied. For example, plates, beams, as well as irregular objects can be welded.

As shown in the drawing, the overlay welding automation apparatus 11 according to the present embodiment includes a manipulator 13, a transfer frame 17 supported by the manipulator 13, And a welding object positioner 51 for supporting a pipe 37 located at an extending end of the welding part 53. The welding part 53 is provided with a welding part 53,

The manipulator 13 includes a vertical guide portion 19 for guiding the vertical movement of the paper surface, a horizontal guide portion 21 for guiding horizontal movement perpendicular to the vertical movement, (Not shown). The support frame 15 serves to keep the vertical guide portion 19 in a vertical state with respect to the paper surface.

The manipulator 13 further includes a first motor 23 for moving the transfer frame 17 in the Z-axis direction and a second motor 25 for horizontally moving the transfer frame 17 in the Y-axis direction. The driving of the first and second motors 23 and 25 is precisely controlled by the control unit 63. That is, the position of the welding electrode 35 to be described later is controlled by the control unit 63. [

The transfer frame 17 supports the welded portion 53 as a member displaceable in the Y-axis and Z-axis directions while being supported by the manipulator 13. An LM gear may be employed in order to prevent the movement of the transfer frame 17 during the linear movement.

The welding portion 53 is provided with a reel 29 wound with a welding wire or the like, a TIG part 31, an extension rod 33 extending horizontally from the tig part 31, 33) of the welding electrode (35).

The welding part 53 is operated by a control signal of the control part 63 and serves to form an overlay welding layer inside the pipe 37. It goes without saying that the welding electrode 35 can also adjust the position in the Z direction and the Y direction.

The welding object positioner 51 includes a base frame 41 for providing a supporting force, a plurality of rollers 45 installed on the base frame 41 to support the pipe 37 so as to rotate axially, And a position adjuster for adjusting the position of the pipe 37 supported by the roller 45. [

The position adjusting unit includes a plurality of spindle chucks 47b for fixing one end of the pipe 37 and a pipe engaging the spindle chuck 47b by rotating the spindle chuck 47b in the direction of arrow S A pipe driving unit 47 having a pipe rotating motor 47a for rotating the pipe driving unit 47 and a tilting motor 49e for moving the tilting gear.

The base frame 41 rotatably supports a plurality of rollers 45 while being fixed on a flat bottom. The roller (45) supports the pipe (37) in a rotatable manner in contact with the outer peripheral surface of the pipe (37). The number of the rollers 45 may be varied as needed.

Further, the spindle chuck 47b fixes the outer peripheral surface of one end of the pipe 37 by fixing it, as if the chuck of the lathe fixes the workpiece. The spindle chuck 47b is symmetrical with respect to the rotation center axis of the pipe 37.

The plurality of spindle chucks 47b are supported by a chuck holder 47c. The chuck holder 47c serves to adjustably position the spindle chuck 47b in the radial direction of the pipe 37. [

The pipe rotating motor 47a is a driving unit for rotating the spindle chuck 47b in a state in which the pipe 37 is fixed by applying a rotational force to the chuck holder 47c. The pipe 37 can be rotated in the direction of the arrow s by the pipe rotating motor 47a. The pipe rotation motor 47a may use a DC motor for uniform speed control.

In this manner, the overlay layer covering the entire inner circumferential surface of the pipe 37 can be formed by axially rotating the pipe 37 and linearly moving the welding electrode 35 to the inside of the pipe 37.

Meanwhile, the tilting gear 47d and the tilting motor 49e tilt the pipe 37 vertically. In other words, the turning shaft 49b is used as a turning center to rotate up and down.

The tilting gear 47d is a semicircular gear having gears formed on the outer circumferential surface of the tilting gear 47d. The gear is vertically erected so that the gears face the opposite side of the pipe 37. The tilting gear 47d is fixed to the chuck holder 47c and is supported on the housing 49a through the rotary shaft 49b.

The housing 49a is a frame-shaped housing fixed to the base frame 41 and supports the tilting gear 49d through the pivot shaft 49b. The tilting motor 49e is engaged with the tilting gear 49d to rotate the tilting gear 49d in the direction of arrow R. To this end, a driving gear (not shown) must be fixed to the driving shaft of the tilting motor 49e.

In any case, when the tilting motor 49e is operated, the tilting gear 49d rotates in the direction of the arrow R, and the pipe 37 is thereby tilted in the vertical direction.

2, the welding automation apparatus 11 according to the present embodiment includes a power check section 55, a camera 57, a cooling system 59, an abnormality detecting section 61, And a control unit 63 may be added.

The power check unit 55 always checks the voltage and current of the power applied to the welding unit 53. If an abnormal voltage and power are applied to the welded portion 53, the power check unit 55 notifies the control unit 63 of the abnormal voltage and power, and causes the control unit 63 to interrupt the power supply. As a result, by operating the power check unit 55, stable power is supplied to the welding unit 53, thereby improving the quality of the overlay welding layer.

In addition, the camera 57 serves to observe the welding condition and the welding condition. For this, the camera 57 is inserted into the pipe 37 together with the welding electrode 35. The contents photographed by the camera 57 are transmitted to the controller 63 in real time.

In addition, the cooling system 59 is intended to maintain the smoothness of the overlay weld surface. The cooling system may include a cooling water pipe, a cooling water nozzle, and the like.

In addition, the abnormality detecting unit 61 informs the operator of the abnormal condition when the abnormal condition is detected. The operator can recognize that an abnormal situation has occurred via a warning message, for example, a buzzer sound or a flickering signal, in which an abnormality detecting unit has occurred, and can perform an immediate follow-up action.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

11: welding automation device 13: manipulator 15: support frame
17: transfer frame 19: vertical guide portion 21: horizontal guide portion
23: first motor 25: second motor 29: reel
31: TIG part 33: Extension rod 35: Welding electrode
37: pipe 41: base frame 45: roller
47: pipe drive unit 47a: pipe rotation motor 47b: spindle chuck
47c: Chuck holder 49a: Housing 49b:
49d: tilting gear 49e: tilting motor 51: welding object positioner

Claims (5)

A manipulator having a vertical guide portion for guiding vertical movement with respect to the ground and a horizontal guide portion for guiding horizontal movement perpendicular to the vertical movement;
A conveyance frame that is horizontally and vertically moved while being supported by the manipulator;
A welding part installed on the transfer frame and positioned together with the transfer frame, for performing overlay welding on the object to be welded;
And a welding object positioner spaced from the manipulator and supporting the object to be welded in a positionable manner. The method according to claim 1,
Wherein the welding object positioner comprises:
A base frame for providing a supporting force,
A plurality of rollers installed on the base frame for supporting a welding object,
And a position adjusting unit for adjusting a position of a welding object supported by the roller. 3. The method of claim 2,
The object to be welded is a pipe,
Wherein the position adjusting unit comprises:
A spindle chuck for fixing one end of the pipe,
And a pipe drive motor having a pipe rotation motor for rotating the spindle chuck to axially rotate the pipe held by the spindle chuck. The method of claim 3,
Wherein the position adjustment unit comprises:
A semicircular tilting gear mounted on the pipe driving unit for vertically tilting the pipe held in the spindle chuck,
Further comprising a tilting motor that engages with the tilting gear and angularly moves the tilting gear. The method according to claim 3 or 4,
The welding portion comprises:
An extension rod extending into the interior of the pipe while being supported by the transport frame,
And a welding electrode provided at an extension end of the extension rod and forming an overlay weld layer on the inner circumferential surface of the pipe.

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