KR100748783B1 - Longitudinal seam outside milling machine for welding joint grooving - Google Patents

Abstract

The present invention relates to a device for improving the external surface of a short pipe, and an object thereof is to process an outer surface of a short pipe welded on the inner surface in a lengthwise direction regardless of a thick plate for manufacturing a steel structure such as a chemical machine, a pressure vessel, a tubular, a pipe, and the like. The purpose of the present invention is to provide a grooving device with a narrow pipe gap milling cutter in order to create the gouging role of the previously welded inner weld route and an unformed weld improvement.

The present invention is based on the surface of the member to remove the defects of the root portion of the inner weld portion and to create an accurate weld improvement shape in order to automatically process the outer surface of the end pipe supplied by being welded to the inner surface for longitudinal outer welding of a single vessel. Milling heads with hydraulic guide rolls and displacement sensors, and three milling head movement slides to compensate for differences between their measured and set values, and separate turning rolls and hydraulics for supporting and securing members during machining. It provides a clamping system with a cylinder applied.

Milling Cutters, Grooving, Single Vessels, Hydraulic Cylinders, Turning Rolls

Description

Longitudinal seam outside milling machine for welding joint grooving}             

1 is a conceptual view of a conventional processing apparatus

Figure 2 is a schematic diagram of the system configuration of the present invention the external tube improvement processing apparatus

3 is a front schematic view of FIG.

4 is a top schematic view of FIG.

5 is a main view of the slide portion of the milling apparatus of the present invention;

6 is a main view of the milling head of the milling apparatus of the present invention;

7 is a main view of the hydraulic clamping portion for fixing the member of the present invention milling device

8 is a schematic diagram of a short pipe member;

Figure 9 is a shape of the processed part for each process when the present invention is applied

<Description of the symbols for the main parts of the drawings>

(1) Member (Rubular Structure) (2) Single Pipe Inner Weld

(3) Tap-piece or Production-piece                 

(4) Milling Cutter (5) Main Bed

(6) Ball Screw for Processing Transfer (7) Slide Bed

(8) Chip Conveyor

(9) Roller Main Base Frame

(10) Slide Rail

(11) Slide bed for width adjustment

(12) Roll width adjusting motor (13) Roll width adjusting reducer

(14) Encoder (15) Roll motor

(16) Roll Reduction Gear (17) Width Screw

(18) Roller frame (19) Turning Roll

(20) Idle roll (21) Clamping base structure

(22) Guide rails (23) Clamping device

(24) Motor for clamping drive (25) Reducer for clamping drive

(26) Rack & Pinion (27,28) Hydraulic cylinders for fixing members

(29,30) Hydraulic cylinders for fixing tab pieces

(31) Ball screw (32) Limit sensor

(33) Spindle Gear Box (34) Hydraulic Pump

(35) CCD Camera (36) Guide Roll Unit

37 guide bar

(38) Hydraulic cylinder for lifting and lowering of guide roll                 

(39) Linear Encoder (40) Laser Pointer

(41) Workpiece Inside (42) Member Outside

(43) Pre Bevelling by Plasma cutting

(44) Workpiece Inside Welding Part

(45) Grooving Shape after Milling

(46) Telescopic Cover

The present invention relates to a longitudinal external welding welding improvement processing and gouging device of a single tube in a vessel manufacturing process, and to measure and control the machining depth based on the surface of the member, and to detect the position of the machined portion of the beginning and end of the member. The present invention relates to an apparatus for automatically milling an improvement process in the form of narrowing of a member constrained by a turning roll and a hydraulic clamping device by driving a three-axis feeder with a milling head equipped with a large milling cutter based on an interpolation algorithm.

In general, the production of cylindrical steel structures required for pressure vessels, pipes, pipes, etc. consists of straight cutting of raw materials, cutting edges, and bending followed by welding joints. In general, in this fabrication, single tube welding is performed twice between the inner and outer surfaces, and the gouging operation of the welding root portion, which is primarily performed, is essentially performed between the two welds. The method used for this gouging operation is generally arc manual gouging, but grinding or machining is performed in a special case. In this gouging operation, machining is generally performed by a standard edge milling machine or a horizontal machine. Use boring machines (HBMs), planers, simple milling machines, or rely on manual grinding. 1 is a conceptual view of a conventional processing apparatus, and an example of applying a planar boring machine having a three-axis feed function to create an improved shape of a weld of a short pipe, wherein a column having a milling head attached to an integrated structure having a traveling bed is shown. It is a device for processing the workpiece on the turning roller located on its side while transferring. The milling head, of course, has a conveying slide structure which also moves in the vertical and horizontal directions along the column. The basic work is to install the tube on the top of the turning roll and place the part to improve welding by rotating the roll so that it has the 3 o'clock position with the boring machine head, and then drive the 3-axis feed slide so that the milling head is positioned at that position. It is done. Of course, the machining operation is performed along the path automatically input by NC control according to the member shape.

However, the apparatus having the above structure or general general processing equipment has some problems as follows.

First, standardized products for standardized small pipes with a diameter of less than 2,000 mm are accessible, but for large cylindrical members with a diameter of 5,000 mm or more, the size of each feeder is too large to accommodate the dimensions of the members. The scale of equipment grows exponentially and its implementation cost and operability are very inefficient, making it difficult to expect economic effects.

Second, in the conventional general-purpose configuration, the processing of thick plates of 100 mm or more, which can be seen as the characteristics of large pressure vessels, is quite difficult, and the actual work time is also required. There is also a significant limitation in the construction of the cutter and the head to cope with the thick plate.

Third, the characteristics of the above-mentioned machines are generally to be subjected to NC machining, but the uniformity of the processing depth and processing thickness due to the relatively poor member shape and dimensional accuracy by the self-deformation of general cylindrical products. It is relatively difficult to create a shape, and in order to comply with this degree, a relatively high force compulsory member restraint device must be provided, and the implementation method and manufacturing cost of the clamping device have considerable limitations.

Fourth, since the existing equipment mainly uses the gouging of the inner surface of the welding machine, it is necessary to provide the primary improvement cutting when cutting by gas or plasma before the initial member bending. In this process, the actual work time is excessively excessive due to the dual working process of gouging and improved shape creation.

Therefore, to solve the above problems, it is always easy to correspond to the workpiece in the form of a tube having a thickness of 20mm ~ 200mm, the diameter of 2,000mm to 9,000mm, and to process the gouging and the creation of the welding improved shape in one process The device could not be applied to improve the conventional device.

The present invention was created to solve the above drawbacks, the outer shape of the tubular workpiece having a thickness of 20mm ~ 200mm, diameter 2000mm to 9,000mm gouging and improved machining work is reflected in the improved shape The large milling cutter is mounted and machined at 6 o'clock of the member, and the feeding of the milling head in the longitudinal direction and the left and right feeding on the plane perpendicular to the longitudinal direction are driven. To adjust the machining depth in the vertical height direction to correspond to the inclined (slant type) feeder, and to compensate for the difference in machining depth according to the deformation of the member, the relative position between the real-time member surface using the linear encoder and the cylinder Implement the measuring depth detection measuring device, and use the separate turning roll to perform the member rotation while supporting the member and observing the processing direction. For building a hydraulic clamping device for fixing the member to correspond to the processing load by providing a first method of operation of the cutting and for turning heavy weld improvement improved short pipe forming an outer surface with high efficiency machining device it is an object.

The present invention for achieving the above object is a large milling cutter and a real-time machining depth measurement and adjustment function that can freely respond to deformation of the member, which can produce a standardized improved shape, turning roll and clamping system corresponding to various member diameters The heavy-duty milling system and the automated control system for these components enable simultaneous gouging operations and improved shaping of uncut parts.

The present invention for achieving the object as described above and to eliminate the conventional drawbacks are separated turnings are installed to support the members placed between the spaced apart in the width direction and to rotate the members to observe the processing direction of the members Wealth; A milling head unit disposed between the separate turning units and placed on the separate turning unit and provided with a milling cutter to process the member; A milling head slide part of a three-axis feed method installed at the lower part of the milling head part to transfer the milling head part; A member clamping hydraulic clamping part installed in the longitudinal direction of the separate turning part to suppress the processing load of the member to be processed by fixing the member in the longitudinal direction; A chip conveyor installed on the side of the milling head and the side of the milling head slide to collect and transport chips generated during machining of the members by the milling head; It is configured to include, and described in detail with reference to the accompanying drawings, preferred embodiments as follows.

2 is a conceptual diagram of the system configuration of the present invention of the short pipe external improvement processing apparatus, Figure 3 is a front schematic view of the actual implementation of Figure 2, Figure 4 is a plan schematic view of the actual implementation of Figure 2,

The present invention is a large milling cutter (4) responsible for creating the improved shape of the member and the spindle gearbox 33 for transmitting power to the cutter, a three-axis milling head slide unit and the main bed for transporting the spindle unit during processing ( 5), two fixed turning rolls 19 facing each other for supporting the members and aligning the weld seam at 6 o'clock, and four idle rolls 20 facing each other one pair of roller main bases 9 for each roll And a separable turning portion formed by being separably installed in the separable portion, and a hydraulic clamping portion for fixing the member, which is installed in the longitudinal direction of the separable turning portion and suppresses the processing load of the member to be processed by fixing the member in the longitudinal direction.
When the processing load is not clamped to the member during processing, the vibration is generated, which results in a problem that the processing load is increased to prevent the machining.

On the other hand, the turning roll 19 supporting the member is installed in a separate type composed of one roller main base 9 for each roll in order to make stable processing conditions in the overhead posture. The basic structure of all six rolls is the same and only the turning rolls, which are responsible for the rotation of the members for machining the part, are additionally equipped with a rotary drive machine. The basic shape is attached to the box-shaped structure for supporting the load of the member and the load during machining, and the slide rail 10 of the dove-tail shape of the heat-treated grinding for the roll transfer to correspond to the various diameters of the member on the upper portion of the structure The width adjustment slide bed 11 corresponding to this rail is mounted, and the roller frame 18 in which a roll, a roll shaft, etc. are assembled with the width adjustment slide bed 11 and a bolt connection method is comprised. In addition, the driving mechanism for the width direction adjustment is made using a roll width adjustment motor 12, a roll width adjustment reducer 13, and a width adjustment screw 17, and for width adjustment for automatic position adjustment according to the specification of the member. The encoder 14 was connected to the screw 17. The driving mechanism for turning the member is composed of a roll rotation motor 15 and a roll rotation reducer 16, and are controlled to operate by synchronizing two rolls for smooth driving force transmission. In use, when the length of the member is short, only four rolls except two outermost idle rolls are used, and when the length of the member is long, four rolls except two middle idle rolls are used. A milling system is installed in the longitudinal direction of the member 1 between six roll structures arranged in parallel. The basic arrangement is based on the centerline of the member, with a milling system on the left side of the control panel. The basic arrangement is based on the centerline of the member, on the left side of the operation panel, a milling system on the left side, and on the right side, a chip conveyor 8 for removing chips generated after machining.

The main configuration of the milling system is largely composed of a milling head attached to a machining cutter and a milling head slide for transferring the milling head in the machining direction in the longitudinal direction of the working member during processing, Figure 5 is the present invention It is a principal part view of the slide part of a milling apparatus, and FIG. 6 is a principal part view of the milling head part of the milling apparatus of this invention.

The milling system of the present invention is a box-shaped steel tube using a thick plate material and constitutes a main bed 5 for milling conveyance corresponding to the member longitudinal direction, and is basically provided with a level block for horizontal adjustment. In the center portion of the configured main bed 5, a ball screw 6 operated by a servo motor which is a transfer driving mechanism is installed. The upper side of the main bed (5) is provided with a corresponding slide bed (7) and the left and right feed shaft for adjusting the cutting depth along the cutting line of the member in the form of bolt connection with the slide bed (7) and the processing depth adjustment It is equipped with a transport structure consisting of an inclined feed shaft for. Both the left and right feed shafts and the up and down feed shafts are driven by the servo motor and the ball screw 31. In particular, the inclined upper and lower feed shafts are manufactured to ensure structural rigidity against excessive processing loads. The feed amount at the depth adjustment is automatically processed and reflected in the member surface position measurement and control program. In addition, in order to prevent equipment damage or member damage caused by excessive feed speed during left and right head transfer during processing, the operating conditions to prevent the milling cutter 4 from exceeding a certain amount of cutting conditions are reflected in the control program. . Each driving slide part is equipped with an automatic lubrication device. In order to prevent the inflow of foreign substances due to processing, all the conveying drive parts are provided with a closed telescopic cover 46, and a dual limit sensor 32 for safety driving of the drive part is provided. To prevent exceeding the permissible stroke. On the milling head feed mechanism, a spindle box is integrally formed with a milling cutter in charge of actual machining. The spindle gear box 33 is configured to be as compact as possible to interfere with the roller frame 18. The spindle gear box 33 is equipped with a lubrication pump for automatic oil supply and a level detection function of the supplied oil so that the machining operation is always performed in a stable lubrication state. It was configured to be performed, and a transparent window for visual observation of this state was also installed. Before and after the milling cutter 4 connected to the spindle gear box 33, a hydraulic guide roll 36 for controlling stable vibration prevention and processing depth at the time of processing is comprised. The guide roll unit 36 senses the surface position of the member through the linear encoder 39 connected to the guide roll by first touching the member before starting the processing of the member 1 and converting the detected position to the reference position before the ascension. In comparison, it feeds back to the controller so that the raising and lowering operation of the milling cutter 4 occurs to make the machining depth of the member equal to the initial set value. In addition, the laser pointer 40 and the CCD camera 35 are connected to the guide roll unit 36 so that the operator can visually check the working part during processing. And this guide roll unit 36 also provides the member shake prevention effect at the time of a process. The guide roll unit 36 installed behind the milling cutter 4 is only for the anti-shake effect of the member, and is operated after the milling cutter 4 starts processing at the beginning of the machining, and at the end of the machining in front of the milling cutter 4 Even after the guide roll unit 36 descends, the rising position is maintained until the end of processing. The cutter cooling air line is additionally installed around the milling cutter 4, and a slide type chip cover is installed to prevent chip scattering. Peristaltic movement as the descent.

Next, the member clamping device 23, which is essential for the external processing of the single pipe, is composed of a hydraulic pressure device having good coping force against strong load and vibration.

7 is a main view of the hydraulic clamping part for fixing the member of the present invention milling device, Figure 8 is a schematic diagram of a single tube member, Figure 9 is a shape of the processing unit by work process generated when the present invention is applied,

The present invention has developed a clamping device (23) that can be freely corresponding to the length of the short pipe at all times in order to secure an effective member for preventing vibration during milling of the short pipe member. Due to the characteristics of the member, it is possible to prevent vibration during machining by efficiently fixing both ends. To achieve this, a longitudinal clamping base structure 21 in which a guide rail 22 is installed on the side of the turning roll is installed, and the clamping base structure 21 is provided. The gantry-type traveling structure equipped with a hydraulic pump 34, a valve, a cylinder (27, 28, 29, 30), and the like is installed on the top of the pipe to efficiently respond to the length of the short pipe. The traveling drive system includes a clamping driving motor 24, a clamping driving reducer 25, and a rack & pinion 26, and a rail clamping device using hydraulic pressure for fixing the position during processing. The running gantry structure is provided with a total of six hydraulic cylinders (27, 28, 29, 30) units with guide bars on the left and right sides. Two of them press the inner surface of the short pipe toward the turning roll contact direction, one presses the inner surface of the short pipe in the direction of the milling cutter, and the other three tap pieces are attached to the end member. It is designed to press the piece 3 or the production-piece 3 from the left and the right and the top. The traveling structure and the hydraulic system are installed one set at each end in the longitudinal direction of the member. The traveling structure is controlled to start running in the initial position state and to automatically detect and align the end of the member using a detection sensor.
9 shows the shape of the member processing portion at the time of welding, in which an improved cutting portion 43 is formed on a pipe inner member 41, and the improved cutting portion 43 is welded to form a member inner surface welding portion 44. FIG. By processing the outer surface of the member 42 by milling, the improved shape 45 after milling, the interior of the improved shape 45 after milling is welded and joined.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. Of course, such changes will fall within the scope of the claims.

In the present invention, in the processing of the outer surface of the tube-shaped workpiece having a thickness of 20mm ~ 200mm, the diameter of 2,000mm to 9,000mm in the longitudinal direction of the weld in the longitudinal direction for gouging and improving the machining process for high efficiency The milling machine was used to unify two separate processes into one, to improve productivity by deciding how to align and fix the members, and to eliminate the process of improving the weld line edge of the disc. In addition, the convenience of welding and automation of related post-war processes were made possible.

First of all, in terms of processing efficiency by the present invention, it has minimized the number of milling operations and the installation time of the workpieces compared to the conventional generalized machines, and saves the number of labors compared to the conventional manual arc gouging operation. The edge improvement cutting work by gas or plasma of the plate was removed. In addition, it was able to freely cope with various thicknesses and dimensions to overcome the production limits of standard equipment.

In terms of product quality, automatic processing depth control by real-time measurement and automatic processing up to the programmed end of work are achieved to reduce the skillful work factors and ensure uniform quality at all times. Relatively very good weld defect removal was achieved, and the cause of defects in welding after arc gouging was also relatively improved.

In terms of operation, the installation of members and the range of objects have been expanded compared to the conventional standardized machines, allowing for member-oriented operation, and free operation related to the entry and exit of members is possible, and the applicability of the equipment to various members is improved. .

As the ripple effect of other processes, it is possible to automate the stable welding of the post process by securing the degree of improvement of the existing gouging work by the machine, and also to be performed after the bending work of the short pipe by eliminating the initial edge improvement cutting process. -up) Sorting work is very easy.

Claims (6)

A separate turning part installed to support the member placed between the spaced apart parts in the width direction and to rotate the member to observe the processing direction of the member; A milling head unit disposed between the separate turning units and placed on the separate turning unit and provided with a milling cutter to process the member; A milling head slide part of a three-axis feed method installed at the lower part of the milling head part to transfer the milling head part;  A member clamping hydraulic clamping part installed in the longitudinal direction of the separate turning part to suppress the processing load of the member to be processed by fixing the member in the longitudinal direction; A chip conveyor installed on the side of the milling head and the side of the milling head slide to collect and transport chips generated during machining of the members by the milling head; Single pipe outer surface improvement processing apparatus, characterized in that configured to include. The method of claim 1, The milling head portion, the milling cutter (4) responsible for the actual processing; Hydraulic guide rolls (36) are installed before and after the milling cutter to control stable vibration prevention and processing depth during machining; A linear encoder 39 connected to the hydraulic guide roll 36 for sensing a surface position of the member; A controller for feeding back and lowering operation signals by comparing the surface position sensed by the linear encoder 39 with a reference position before ascending to make the machining depth of the member equal to the initial setting value; Single tube outer surface improvement processing apparatus, characterized in that consisting of a spindle 33 for transmitting power to the milling cutter (4). The method of claim 1, The milling head slide part includes a main bed (5) for milling conveyance corresponding to the longitudinal direction of the member; A slide bed (7) provided on an upper portion of the main bed (5) and opposed; A feed structure comprising a left and right feed shaft for moving the milling cutter 4 along the cutting line of the member in the form of bolt connection with the slide bed 7 and an inclined feed shaft for adjusting the processing depth; Single tube outer surface improvement processing apparatus is installed in the central portion of the main bed (5) is composed of a ball screw (31) for driving the left and right feed shaft and the inclined feed shaft and operated by a servo motor. The method of claim 3, wherein The milling head slide unit and the automatic lubrication device; There is a telescopic cover 46 to prevent the inflow of foreign matter due to processing and Single tube outer surface improvement processing apparatus, characterized in that the dual limit sensor 32 for driving the safety of the drive unit is further provided. The method of claim 1, The separate turning part includes two fixed turning rolls 19 facing each other for supporting the member and aligning the weld line in the 6 o'clock direction, and four idle rolls 20 facing each other one roller main base (for each roll) 9) Short pipe outer surface improvement processing apparatus, characterized in that is configured to be installed separately. The method of claim 1, Hydraulic clamping part for fixing the member and the longitudinal clamping base structure 21, the guide rail 22 is installed to the side of the fixed turning roll 19, A clamping device 23 installed on the clamping base structure 21 to restrain a processing load on a member to be processed by fixing the member in a longitudinal direction; Single pipe outer surface improvement processing apparatus comprising a hydraulic system comprising a hydraulic pump (34), a valve, a cylinder (27, 28, 29, 39) mounted on the clamping base structure (21).

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