US20080292417A1 - Debeading tool for butt-welded plastic pipe - Google Patents
Debeading tool for butt-welded plastic pipe Download PDFInfo
- Publication number
- US20080292417A1 US20080292417A1 US12/186,090 US18609008A US2008292417A1 US 20080292417 A1 US20080292417 A1 US 20080292417A1 US 18609008 A US18609008 A US 18609008A US 2008292417 A1 US2008292417 A1 US 2008292417A1
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- US
- United States
- Prior art keywords
- pipe
- cutter
- butt
- cutting
- work head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000004033 plastic Substances 0.000 title claims abstract description 18
- 229920003023 plastic Polymers 0.000 title claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 53
- 239000011324 bead Substances 0.000 claims abstract description 50
- 238000003780 insertion Methods 0.000 claims abstract description 11
- 230000037431 insertion Effects 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 abstract description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 16
- -1 polypropylene Polymers 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229920001084 poly(chloroprene) Polymers 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 240000002317 Camassia leichtlinii Species 0.000 description 1
- 235000000459 Camassia leichtlinii Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004023 plastic welding Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/12—Trimming or finishing edges, e.g. deburring welded corners
- B23C3/122—Trimming or finishing edges, e.g. deburring welded corners of pipes or cylinders
- B23C3/124—Trimming or finishing edges, e.g. deburring welded corners of pipes or cylinders internally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/08—Side or top views of the cutting edge
- B23C2210/084—Curved cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
- B23C2222/28—Details of hard metal, i.e. cemented carbide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2226/00—Materials of tools or workpieces not comprising a metal
- B23C2226/61—Plastics not otherwise provided for, e.g. nylon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2270/00—Details of milling machines, milling processes or milling tools not otherwise provided for
- B23C2270/08—Clamping mechanisms or provision for clamping
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/39—Cutting by use of rotating axially moving tool with radially outer limit of cutting edge moving to define cylinder partially, but not entirely encircled by work
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/83—Tool-support with means to move Tool relative to tool-support
- Y10T408/85—Tool-support with means to move Tool relative to tool-support to move radially
- Y10T408/858—Moving means including wedge, screw or cam
- Y10T408/8598—Screw extending perpendicular to tool-axis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/3042—Means to remove scale or raised surface imperfection
- Y10T409/304256—Means to remove flash or burr
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/304424—Means for internal milling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/50—Planing
- Y10T409/501476—Means to remove flash or burr
- Y10T409/50164—Elongated work
- Y10T409/501804—Flash or burr inside hollow work
Definitions
- This invention relates to debeading or trimming of weld flash inside a butt-welded plastic pipe and more particularly to a tool that can be used with hard plastics such as PVC, PVDF, polypropylene and the like.
- Plastic pipes and pipe liners typically are made in standard lengths, such as 20 feet or 40 feet, and are interconnected end-to-end to make a long pipe string.
- Butt welding of plastic pipe produces a weld bead or flash that is preferably removed before the pipe is placed in service for conveying liquids to reduce flow restriction and reduction, turbulence wear, biofilm/bacteria entrapment and potential for blockages forming at the joints.
- Plastic pipes are also used as conduit for cable, and, again, it is desirable to remove the weld flash before attempting to pull cable into the butt-welded pipe string.
- Such pipes have been made of polyethylene, which is a relatively soft thermoplastic that can be readily butt-welded and easily debeaded.
- a tool known as the Bead Trimmer IITM has been made and sold by R & L Manufacturing Inc. of Camas, Wash.
- the tool includes a bead trimmer head assembly that mounts on one end of a series of interconnected torque tubes and is pushed into the butt-welded pipe until the internal bead or weld flash is contacted.
- the head assembly has a central shaft that couples to the torque tube end and has a centering disk sized to the pipe for retaining the head assembly centered in the pipe as it is inserted.
- a gauge mounted on the periphery of the centering disk contacts the bead when the tool reaches the bead.
- the operator manually rotates a T-shaped bar mounted at the opposite end of the torque tube string to rotate a cutter around a full circle inside of the pipe.
- the cutter includes a fixed blade that extends lengthwise along the sidewall of the pipe, aligned with the gauge so that, when the gauge contacts the weld flash or bead, the blade straddles the bead.
- the blade has an edge that is beveled to cut into the bead when rotated until locating registers at each end of the blade holder contact the inner wall of the pipe, at which point the blade holder maintains a constant cutting depth of the blade edge.
- PVC polypropylene
- C-900 and C-905 fusible PVC have enabled butt-welding PVC pipes.
- the fusion methods developed for this material likewise produces a weld flash or bead, which it is also desirable to remove.
- PVC is much harder than polyethylene; so hard, in fact, that the Bead Trimmer IITM is incapable of cutting the weld flash or bead.
- Other plastics that are similarly hard include PVDF and polypropylene.
- One aspect of the invention is a tool capable of internally debeading butt-welded pipe made of PVC and similarly hard plastics.
- the tool has rotary cutter that can be positioned in alignment with and pressed against the weld bead for cutting the bead.
- the cutter is preferably positioned at an angle to the pipe side wall.
- Another aspect of the invention is a method for internally debeading butt-welded pipe made of PVC and similarly hard plastics.
- the rotary cutter is operated while the tool is rotated around the inside of the pipe.
- FIG. 1 is an upper perspective view of one embodiment of the work head of a debeading tool according to the invention.
- FIG. 2 is a top plan view of the work head of the debeading tool of FIG. 1 , in a butt-welded PVC pipe shown in dashed lines, with the motor positioning actuator removed to show interior structure.
- FIG. 3 is a side perspective view of the work head of FIG. 2 , with the cutting tool in a lowered position for cutting the bead from inside a butt-welded PVC pipe.
- FIGS. 4A and 4B are top and bottom views, respectively, of the operator end of a debeading tool according to the invention.
- FIG. 5 is a front elevation view of the work head as seen through a cross-section of the pipe along lines 5 - 5 of FIG. 2 , shown with the cutting tool in a retracted position for placement in a butt-welded PVC pipe.
- FIG. 6 is a front elevation view of the work head through a cross-section of the pipe along lines 6 - 6 of FIG. 3 , shown during debeading of a weld flash in a PVC pipe.
- FIG. 7 is a side perspective view of the cutter of FIGS. 1-6 .
- FIG. 8 is a side elevation view of an alternative embodiment of the tool according to the invention, particularly suited for narrow diameter pipes.
- FIG. 9 is a side perspective view of an embodiment of a pipe cleaning tool positioned in the pipe for removing PVC chips and dust after cutting away the bead.
- FIGS. 1-6 are various views of one embodiment of the work head 10 of a debeading tool for debeading a joint in butt-welded plastic pipe according to the invention.
- the debeading tool comprises generally the work head 10 , a torque tube 12 for insertion into a length of cylindrical pipe 14 , and a handle structure 16 for rotating the torque tube about an axis that is substantially coaxial with the pipe.
- the handle structure can be a simple T-bar, or a pair of torque arms 18 as shown in FIGS. 4A and 4B , or a steering wheel mounted on the operator or proximal end of the torque tube 12 .
- the torque tube can be a continuous length of pipe with coupler at each end to connect to the handle structure 16 and to the cutting head 10 , or can be a known structure consisting of a series of shorter tube lengths, e.g., 8-foot lengths, each interconnected by couplers (not shown) that link the tube lengths together and to the cutting head and handle structure.
- a control box 20 is mounted on the handle structure 16 over the operator end of the torque tube.
- the debeading tool 10 includes a clamp 22 positioned along the torque tube to fix the tool in a debeading position lengthwise in the pipe.
- the clamp is integrated into the work head 10 to fit inside the PVD pipe, as further described below.
- the work head 10 of the debeading tool includes including a frame sized to fit within the pipe, coupled to a distal end of the torque tube 12 .
- this frame includes a pair of parallel spaced side frame members 24 coupled to the torque tube and extending approximately parallel to the torque tube axis.
- Three transverse web members 26 , 28 , 30 interconnect the side members.
- Web members 28 , 30 support a rotary cutter motor 32 and web member 26 supports a locating gauge 34 for contacting the interior weld flash or bead 36 in the butt-welded pipe when the tool is pushed longitudinally into the pipe, as described below.
- the frame members 24 are coupled to a transverse track structure mounted on a distal end of the torque tube.
- This track structure can be formed by a rectangular metal bar 37 affixed perpendicularly to the end of a coupler received in the end of the torque tube.
- the metal bar has parallel ridges 38 on opposite sides which are slidable in grooves 40 in the interior sidewalls of the side frame members.
- the side frame members also have eight bearing rollers 42 , four each mounted on each side of the metal bar 37 .
- the ridges 38 , mating grooves 40 and rollers 42 rigidly support the frame structure in parallel relationship to the torque tube while allowing translational movement as indicated by arrows 44 .
- a pneumatic actuator 46 having a cylinder coupled to one end of the track structure by a mounting arm 48 (not shown in FIG. 2 ) and a ram coupled to a transverse pivot 50 between the side frame members.
- the actuator could alternatively be hydraulic or an electric solenoid.
- This actuator moves the frame structure transversely toward and away from the axis of the torque tube, thereby moving the rotary cutting motor 32 between the insertion/removal position shown in FIG. 5 and a cutting position shown in FIG. 6 .
- the rotary cutter motor 32 in this embodiment is mounted on the frame at an angle to the torque tube such that the motor's output shaft and chuck 33 are oriented in the cutting position at a predetermined angle, such as 12 degrees, relative to the torque tube axis.
- a rotary multifluted cutter 50 is mounted in the motor's chuck 33 on the output shaft and the motor is mounted longitudinally relative to the frame side members so that the cutter 50 is positioned in longitudinal alignment with the locating gauge 34 .
- the cutter 50 has a central shaft 52 and a plurality of carbide cutting flutes 52 oriented at an angle 54 to the motor output shaft, e.g., 12 degrees, as shown in FIG. 7 , such that the cutting flutes are substantially parallel to an interior wall 56 of the pipe 14 when the tool is in the cutting position for cutting the weld bead 36 .
- the cutting flutes 52 span the weld bead; that is, the length of the flutes is approximately bisected by the weld bead.
- the cutting flutes 52 are curved outwardly then inwardly from end-to-end about an arc of a predetermined radius, e.g., of about 3.5 inches (8.9 cm).
- a bearing roller 58 is mounted on the distal end of the cutter 50 , in axial alignment with the central shaft 52 .
- the bearing roller serves as a depth gauge which contacts the pipe side wall 56 to maintain the cutting flutes at an elevation that cuts the weld bead without cutting too deeply into the pipe sidewall.
- the rotary motor 32 in this embodiment is a pneumatic rotary motor, preferably capable of high speed operation, e.g., 20,000 rpm, but a hydraulic or electric motor could be used instead.
- the control panel 20 positioned adjacent the handle structure 16 contains valves and handles for the operator manually independently to operate clamp 22 to fix the work head 10 longitudinally in the pipe once the locating gauge 34 contacts the weld bead 36 , to operate the actuator 46 for moving the frame, cutter motor and cutter from the insertion/removal position to the cutting position and back, and to turn the cutter motor 32 on and off. If hydraulic or electric actuators and/or motors are used instead of pneumatic, those skilled in the art can readily substitute the appropriate types of controls in panel 20 .
- the clamp 22 in the illustrated embodiment is mounted between the distal end of the torque tube and the work head, but need not be.
- the clamp can be positioned around the operator end of the torque tube and can be an annular fitting adjacent the control box that can move with the torque tube during insertion into the PVC pipe and, when the work head contacts the internal bead at the butt-welded joint in two pipes, can be coupled to the operator end of the pipe to fix the torque tube axially in position.
- the clamp 22 is journaled on a cylindrical sleeve 58 to rotate freely over a central shaft extending axially between the distal end of the torque tube and the work head.
- the clamp structure includes three radial vanes 60 , 62 , 64 arranged substantially parallel and equi-angularly around the axis of the torque tube on two longitudinally-spaced disks mounted around sleeve 58 . Two of the vanes 62 , 64 can be fixed to the disks. The third vane 64 is movable radially in slots in the disks.
- Two longitudinally-spaced actuators 66 each have a cylinder mounted on the sleeve 58 and a ram coupled to an inner edge of the vane 64 to push the vane outward to compress radially against the interior side wall of the pipe when actuated.
- the control panel 20 includes a coupling 70 in the proximal end of the handle structure through which pressurized air is supplied to a manifold inside the handle structure having three output conduits 72 , 74 , 76 .
- Conduit 72 connects to a valve 82 and conduits 74 , 76 to valves 84 , 86 , respectively, which can be actuated from the upper side of the control panel.
- These valves are coupled to hoses 83 , 85 , 87 that extend along the length of the torque tube, respectively, to the motor 32 , the motor positioning actuator 46 , and clamp actuators 66 .
- the line to the motor positioning actuator 46 includes a relief line 90 and flow control valve 92 to dampen the actuation of movement of the motor toward the cutting position, to avoid damage to the cutter.
- Sufficient length for the hoses is provided at the control panel and also at the work head to permit the handle structure, control panel, torque tube and work head to rotate through a full circle relative to the clamp 22 without stressing or crimping the hoses.
- the locating gauge 34 in this embodiment comprises a pair of bearing rollers 94 mounted in transversely-spaced position on a cross-member 96 supported on web member 26 by a pair of laterally spaced studs 98 .
- the studs connect to cross member 96 through oblong holes 97 so that the cross member has some lateral play to accommodate variations in alignment between the axis of the debeading tool and that of the pipe.
- the bearing rollers 94 are spaced to fit loosely within the pipe, for example, providing about one-quarter inch of play. This structure is arranged to position the forward end of the bearing rollers axially in alignment with approximately the lengthwise center of the cutter.
- FIG. 8 another embodiment of the debeading tool has a frame that is fixed relative to the axis of the torque tube, rather than on a transversely movable track.
- the rotary cutting motor 32 is pivotably mounted on the side members by pivot pin 99 and the actuator 46 is connected to the rearward end of the motor for movement of the cutter 50 between a retracted position and the cutting position at the predetermined angle relative to the torque tube axis.
- the cutter 50 includes a rotatable gauge 58 at its distal end having a diameter sized relative to the cutter such that the gauge supports the cutter on a side wall of the pipe at the predetermined angle 54 , e.g., 12 degrees.
- the gauge 58 again supports the cutter at that angle against the pressure toward the pipe exerted on the motor by actuator 46 .
- a pipe cleaner 100 sized to fit the diameter of pipe is inserted into one section of pipe before a next section is butt-welded to it.
- the pipe cleaner is made of circular disks of a flexible material, such as neoprene, rubber, flexible PVC and the like, mounted coaxially on a shaft.
- the pipe cleaner is formed as three spaced rubber disks 102 , 104 , 106 mounted on a shaft.
- the middle disk 104 is neoprene foam and the two end disks are 60-70 durometer neoprene.
- the disks are held in spaced position between pairs of large metal or rigid plastic washers 108 , mounted on the shaft concentrically with the disks, leaving only a peripheral 3 ⁇ 4 inch or so of the rubber or neoprene exposed.
- Other arrangements can be used to effectively drag and wipe chips and chaff from cutting the PVC pipe bead from inside the pipe.
- An engagement structure 110 is provided at one end of the disk and shaft assembly, in position to be engaged by a hook or harpoon 112 on the end of the locator assembly, for pulling the pipe cleaner through the pipe as the debeading tool is withdrawn after cutting away the internal bead.
- the engagement structure is shown as a wire mesh with a spacing of the wires close enough for the harpoon to fit into the openings in the mesh and then engage the adjacent wires when retracted.
- the engagement structure can be formed by looped structure at the end of the shaft that is simply a series of loops of small gauge twisted wire cable arranged in a donut-shaped nest or cup around the center shaft so the harpoon 112 on the bead locator assembly grabs a few strands of the twisted wire cable to pull the pipe cleaner through the pipe as the debeading tool is being retracted.
- the pipe cleaner 100 is inserted into an end of a first pipe segment before butt-welding a second pipe segment to it. Then the two pipe segments are butt-welded together. Then, the debeading tool work head 10 and torque tube 12 are inserted into the distal or upstream end of the second pipe segment until the locating gauge 34 contacts the weld bead 36 . At this time, the handle structure 16 is close to the end of the second pipe. The operator then actuates the actuators 66 to operate the clamp assembly and thereby fix the work head in place in the pipe with the locator assembly 34 and cutter 50 aligned longitudinally with the weld bead 36 . Then the actuator 48 is operated to move the cutter 50 against the weld bead 36 .
- the bearing roller 58 contacts the interior wall of the pipe to maintain the predetermined angle, (e.g., 12 degrees). Then, the motor 32 is turned on to rotate the cutter 50 while actuator 48 maintains pressure of the cutter against the weld bead. The operator then rotates handle structure 16 to rotate the work head around the inside of the pipe as the cutter cuts the weld bead. When finished, the motor is turned off, the cutter is moved away from the side wall and the clamp 22 is unclamped; then the debeading tool is pushed further into the pipe so that the harpoon 112 is protruding into the mesh or nest of wires 110 in the pipe cleaner 100 . Then, the tools are retracted from the pipe. The engagement structure 110 is engaged by a hook or harpoon 112 and pulls the pipe cleaner 100 through the pipe, cleaning the pipe. This procedure is then repeated for each successive segment of pipe.
- the predetermined angle e.g. 12 degrees
Abstract
A debeading tool capable of internally debeading butt-welded pipe made of PVC and similarly hard plastics has a work head that can be coupled to a distal end of a torque tube. The work head includes a motor carrying a cutter which is oriented at an angle, e.g., 12 degrees, to the interior pipe wall for cutting the weld bead as the tool is rotated inside the pipe. The work head cutter can be moved between an insertion/removal position away from the side wall and a cutting position against the bead on the side wall. A locator assembly that contacts the bead during insertion of the work head aids in positioning the cutter to straddle the weld bead. A pipe cleaner can be prepositioned in the pipe before butt-welding to be engaged upon removal of the work head to pull weld bead chips and fines from the pipe.
Description
- This application is a division of copending U.S. application Ser. No. 11/531,622, filed Sep. 13, 2006, now U.S. Pat. No. ______, the contents of which are herein incorporated by reference in their entirety.
- This invention relates to debeading or trimming of weld flash inside a butt-welded plastic pipe and more particularly to a tool that can be used with hard plastics such as PVC, PVDF, polypropylene and the like. Plastic pipes and pipe liners typically are made in standard lengths, such as 20 feet or 40 feet, and are interconnected end-to-end to make a long pipe string.
- Butt welding of plastic pipe produces a weld bead or flash that is preferably removed before the pipe is placed in service for conveying liquids to reduce flow restriction and reduction, turbulence wear, biofilm/bacteria entrapment and potential for blockages forming at the joints. Plastic pipes are also used as conduit for cable, and, again, it is desirable to remove the weld flash before attempting to pull cable into the butt-welded pipe string.
- In the past, such pipes have been made of polyethylene, which is a relatively soft thermoplastic that can be readily butt-welded and easily debeaded. A tool known as the Bead Trimmer II™ has been made and sold by R & L Manufacturing Inc. of Camas, Wash. The tool includes a bead trimmer head assembly that mounts on one end of a series of interconnected torque tubes and is pushed into the butt-welded pipe until the internal bead or weld flash is contacted. The head assembly has a central shaft that couples to the torque tube end and has a centering disk sized to the pipe for retaining the head assembly centered in the pipe as it is inserted. A gauge mounted on the periphery of the centering disk contacts the bead when the tool reaches the bead. When contact is made, the operator manually rotates a T-shaped bar mounted at the opposite end of the torque tube string to rotate a cutter around a full circle inside of the pipe. The cutter includes a fixed blade that extends lengthwise along the sidewall of the pipe, aligned with the gauge so that, when the gauge contacts the weld flash or bead, the blade straddles the bead. The blade has an edge that is beveled to cut into the bead when rotated until locating registers at each end of the blade holder contact the inner wall of the pipe, at which point the blade holder maintains a constant cutting depth of the blade edge. Continued rotation of the head assembly cuts the bead away from the pipe wall. When this action is completed, the head assembly is withdrawn from the pipe. Several hooks distributed radially around the downstream end of the head assembly engage the cut-away bead and drag it from the pipe.
- Recent formulations of PVC, such as C-900 and C-905 fusible PVC, have enabled butt-welding PVC pipes. The fusion methods developed for this material likewise produces a weld flash or bead, which it is also desirable to remove. PVC is much harder than polyethylene; so hard, in fact, that the Bead Trimmer II™ is incapable of cutting the weld flash or bead. Other plastics that are similarly hard include PVDF and polypropylene.
- Accordingly, a need remains for a way to debead butt-welded pipe made of PVC, PVDF, polypropylene and other similarly hard plastics.
- One aspect of the invention is a tool capable of internally debeading butt-welded pipe made of PVC and similarly hard plastics. The tool has rotary cutter that can be positioned in alignment with and pressed against the weld bead for cutting the bead. The cutter is preferably positioned at an angle to the pipe side wall.
- Another aspect of the invention is a method for internally debeading butt-welded pipe made of PVC and similarly hard plastics. The rotary cutter is operated while the tool is rotated around the inside of the pipe.
- The foregoing and other objects, features and advantages of the invention will become more readily apparent from the following detailed description of a preferred embodiment of the invention that proceeds with reference to the accompanying drawings.
-
FIG. 1 is an upper perspective view of one embodiment of the work head of a debeading tool according to the invention. -
FIG. 2 is a top plan view of the work head of the debeading tool ofFIG. 1 , in a butt-welded PVC pipe shown in dashed lines, with the motor positioning actuator removed to show interior structure. -
FIG. 3 is a side perspective view of the work head ofFIG. 2 , with the cutting tool in a lowered position for cutting the bead from inside a butt-welded PVC pipe. -
FIGS. 4A and 4B are top and bottom views, respectively, of the operator end of a debeading tool according to the invention. -
FIG. 5 is a front elevation view of the work head as seen through a cross-section of the pipe along lines 5-5 ofFIG. 2 , shown with the cutting tool in a retracted position for placement in a butt-welded PVC pipe. -
FIG. 6 is a front elevation view of the work head through a cross-section of the pipe along lines 6-6 ofFIG. 3 , shown during debeading of a weld flash in a PVC pipe. -
FIG. 7 is a side perspective view of the cutter ofFIGS. 1-6 . -
FIG. 8 is a side elevation view of an alternative embodiment of the tool according to the invention, particularly suited for narrow diameter pipes. -
FIG. 9 is a side perspective view of an embodiment of a pipe cleaning tool positioned in the pipe for removing PVC chips and dust after cutting away the bead. -
FIGS. 1-6 are various views of one embodiment of thework head 10 of a debeading tool for debeading a joint in butt-welded plastic pipe according to the invention. The debeading tool comprises generally thework head 10, atorque tube 12 for insertion into a length ofcylindrical pipe 14, and ahandle structure 16 for rotating the torque tube about an axis that is substantially coaxial with the pipe. The handle structure can be a simple T-bar, or a pair oftorque arms 18 as shown inFIGS. 4A and 4B , or a steering wheel mounted on the operator or proximal end of thetorque tube 12. The torque tube can be a continuous length of pipe with coupler at each end to connect to thehandle structure 16 and to thecutting head 10, or can be a known structure consisting of a series of shorter tube lengths, e.g., 8-foot lengths, each interconnected by couplers (not shown) that link the tube lengths together and to the cutting head and handle structure. Acontrol box 20, further described below, is mounted on thehandle structure 16 over the operator end of the torque tube. - The
debeading tool 10 includes aclamp 22 positioned along the torque tube to fix the tool in a debeading position lengthwise in the pipe. In the embodiment shown inFIGS. 1-6 , the clamp is integrated into thework head 10 to fit inside the PVD pipe, as further described below. - The
work head 10 of the debeading tool includes including a frame sized to fit within the pipe, coupled to a distal end of thetorque tube 12. In the illustrated embodiment, this frame includes a pair of parallel spacedside frame members 24 coupled to the torque tube and extending approximately parallel to the torque tube axis. Threetransverse web members Web members rotary cutter motor 32 andweb member 26 supports a locatinggauge 34 for contacting the interior weld flash or bead 36 in the butt-welded pipe when the tool is pushed longitudinally into the pipe, as described below. - The
frame members 24 are coupled to a transverse track structure mounted on a distal end of the torque tube. This track structure can be formed by arectangular metal bar 37 affixed perpendicularly to the end of a coupler received in the end of the torque tube. The metal bar hasparallel ridges 38 on opposite sides which are slidable in grooves 40 in the interior sidewalls of the side frame members. The side frame members also have eightbearing rollers 42, four each mounted on each side of themetal bar 37. Theridges 38, mating grooves 40 androllers 42 rigidly support the frame structure in parallel relationship to the torque tube while allowing translational movement as indicated byarrows 44. - A
pneumatic actuator 46 having a cylinder coupled to one end of the track structure by a mounting arm 48 (not shown inFIG. 2 ) and a ram coupled to atransverse pivot 50 between the side frame members. The actuator could alternatively be hydraulic or an electric solenoid. This actuator moves the frame structure transversely toward and away from the axis of the torque tube, thereby moving therotary cutting motor 32 between the insertion/removal position shown inFIG. 5 and a cutting position shown inFIG. 6 . Therotary cutter motor 32 in this embodiment is mounted on the frame at an angle to the torque tube such that the motor's output shaft andchuck 33 are oriented in the cutting position at a predetermined angle, such as 12 degrees, relative to the torque tube axis. - A
rotary multifluted cutter 50 is mounted in the motor'schuck 33 on the output shaft and the motor is mounted longitudinally relative to the frame side members so that thecutter 50 is positioned in longitudinal alignment with the locatinggauge 34. Thecutter 50 has acentral shaft 52 and a plurality ofcarbide cutting flutes 52 oriented at anangle 54 to the motor output shaft, e.g., 12 degrees, as shown inFIG. 7 , such that the cutting flutes are substantially parallel to aninterior wall 56 of thepipe 14 when the tool is in the cutting position for cutting theweld bead 36. When the locating gauge contacts the weld bead, the cuttingflutes 52 span the weld bead; that is, the length of the flutes is approximately bisected by the weld bead. The cutting flutes 52 are curved outwardly then inwardly from end-to-end about an arc of a predetermined radius, e.g., of about 3.5 inches (8.9 cm). A bearingroller 58 is mounted on the distal end of thecutter 50, in axial alignment with thecentral shaft 52. The bearing roller serves as a depth gauge which contacts thepipe side wall 56 to maintain the cutting flutes at an elevation that cuts the weld bead without cutting too deeply into the pipe sidewall. - The
rotary motor 32 in this embodiment is a pneumatic rotary motor, preferably capable of high speed operation, e.g., 20,000 rpm, but a hydraulic or electric motor could be used instead. Thecontrol panel 20 positioned adjacent thehandle structure 16 contains valves and handles for the operator manually independently to operateclamp 22 to fix thework head 10 longitudinally in the pipe once the locatinggauge 34 contacts theweld bead 36, to operate theactuator 46 for moving the frame, cutter motor and cutter from the insertion/removal position to the cutting position and back, and to turn thecutter motor 32 on and off. If hydraulic or electric actuators and/or motors are used instead of pneumatic, those skilled in the art can readily substitute the appropriate types of controls inpanel 20. - The
clamp 22 in the illustrated embodiment is mounted between the distal end of the torque tube and the work head, but need not be. For example, the clamp can be positioned around the operator end of the torque tube and can be an annular fitting adjacent the control box that can move with the torque tube during insertion into the PVC pipe and, when the work head contacts the internal bead at the butt-welded joint in two pipes, can be coupled to the operator end of the pipe to fix the torque tube axially in position. In the illustrated embodiment ofFIGS. 1-6 , theclamp 22 is journaled on acylindrical sleeve 58 to rotate freely over a central shaft extending axially between the distal end of the torque tube and the work head. The clamp structure includes threeradial vanes sleeve 58. Two of thevanes third vane 64 is movable radially in slots in the disks. Two longitudinally-spacedactuators 66 each have a cylinder mounted on thesleeve 58 and a ram coupled to an inner edge of thevane 64 to push the vane outward to compress radially against the interior side wall of the pipe when actuated. - The
control panel 20 includes acoupling 70 in the proximal end of the handle structure through which pressurized air is supplied to a manifold inside the handle structure having threeoutput conduits Conduit 72 connects to avalve 82 andconduits valves hoses motor 32, themotor positioning actuator 46, and clampactuators 66. The line to themotor positioning actuator 46 includes a relief line 90 and flow control valve 92 to dampen the actuation of movement of the motor toward the cutting position, to avoid damage to the cutter. Sufficient length for the hoses is provided at the control panel and also at the work head to permit the handle structure, control panel, torque tube and work head to rotate through a full circle relative to theclamp 22 without stressing or crimping the hoses. - The locating
gauge 34 in this embodiment comprises a pair of bearingrollers 94 mounted in transversely-spaced position on a cross-member 96 supported onweb member 26 by a pair of laterally spacedstuds 98. The studs connect to crossmember 96 throughoblong holes 97 so that the cross member has some lateral play to accommodate variations in alignment between the axis of the debeading tool and that of the pipe. The bearingrollers 94 are spaced to fit loosely within the pipe, for example, providing about one-quarter inch of play. This structure is arranged to position the forward end of the bearing rollers axially in alignment with approximately the lengthwise center of the cutter. When the bearing rollers are in contact with theweld bead 36, the cutter straddles the weld bead. Referring toFIG. 8 , another embodiment of the debeading tool has a frame that is fixed relative to the axis of the torque tube, rather than on a transversely movable track. Therotary cutting motor 32 is pivotably mounted on the side members bypivot pin 99 and theactuator 46 is connected to the rearward end of the motor for movement of thecutter 50 between a retracted position and the cutting position at the predetermined angle relative to the torque tube axis. As mentioned above, thecutter 50 includes arotatable gauge 58 at its distal end having a diameter sized relative to the cutter such that the gauge supports the cutter on a side wall of the pipe at thepredetermined angle 54, e.g., 12 degrees. In this embodiment, thegauge 58 again supports the cutter at that angle against the pressure toward the pipe exerted on the motor byactuator 46. - Referring to
FIG. 9 , apipe cleaner 100 sized to fit the diameter of pipe is inserted into one section of pipe before a next section is butt-welded to it. The pipe cleaner is made of circular disks of a flexible material, such as neoprene, rubber, flexible PVC and the like, mounted coaxially on a shaft. In one embodiment, shown inFIG. 9 , the pipe cleaner is formed as three spacedrubber disks middle disk 104 is neoprene foam and the two end disks are 60-70 durometer neoprene. The disks are held in spaced position between pairs of large metal or rigidplastic washers 108, mounted on the shaft concentrically with the disks, leaving only a peripheral ¾ inch or so of the rubber or neoprene exposed. Other arrangements can be used to effectively drag and wipe chips and chaff from cutting the PVC pipe bead from inside the pipe. Anengagement structure 110 is provided at one end of the disk and shaft assembly, in position to be engaged by a hook or harpoon 112 on the end of the locator assembly, for pulling the pipe cleaner through the pipe as the debeading tool is withdrawn after cutting away the internal bead. The engagement structure is shown as a wire mesh with a spacing of the wires close enough for the harpoon to fit into the openings in the mesh and then engage the adjacent wires when retracted. Alternatively, the engagement structure can be formed by looped structure at the end of the shaft that is simply a series of loops of small gauge twisted wire cable arranged in a donut-shaped nest or cup around the center shaft so the harpoon 112 on the bead locator assembly grabs a few strands of the twisted wire cable to pull the pipe cleaner through the pipe as the debeading tool is being retracted. - In operation, the
pipe cleaner 100 is inserted into an end of a first pipe segment before butt-welding a second pipe segment to it. Then the two pipe segments are butt-welded together. Then, the debeadingtool work head 10 andtorque tube 12 are inserted into the distal or upstream end of the second pipe segment until the locatinggauge 34 contacts theweld bead 36. At this time, thehandle structure 16 is close to the end of the second pipe. The operator then actuates theactuators 66 to operate the clamp assembly and thereby fix the work head in place in the pipe with thelocator assembly 34 andcutter 50 aligned longitudinally with theweld bead 36. Then theactuator 48 is operated to move thecutter 50 against theweld bead 36. The bearingroller 58 contacts the interior wall of the pipe to maintain the predetermined angle, (e.g., 12 degrees). Then, themotor 32 is turned on to rotate thecutter 50 whileactuator 48 maintains pressure of the cutter against the weld bead. The operator then rotates handlestructure 16 to rotate the work head around the inside of the pipe as the cutter cuts the weld bead. When finished, the motor is turned off, the cutter is moved away from the side wall and theclamp 22 is unclamped; then the debeading tool is pushed further into the pipe so that the harpoon 112 is protruding into the mesh or nest ofwires 110 in thepipe cleaner 100. Then, the tools are retracted from the pipe. Theengagement structure 110 is engaged by a hook or harpoon 112 and pulls thepipe cleaner 100 through the pipe, cleaning the pipe. This procedure is then repeated for each successive segment of pipe. - Having described and illustrated the principles of the invention in various embodiments thereof, it should be apparent that the invention can be modified in arrangement and detail without departing from such principles. We claim all modifications and variations coming within the spirit and scope of the following claims.
Claims (12)
1. A work head for a debeading tool for debeading a joint in butt-welded plastic pipe, comprising:
a frame having a coupler to couple the work head to a distal end of a torque tube;
a rotary cutting motor mounted on the frame and having an output shaft;
means for moving the cutting motor transversely of the torque tube axis between an insertion position spaced away from an interior wall of the pipe and a cutting position in which the output shaft is oriented in a cutting position at a predetermined angle relative to the torque tube axis;
a locating gauge mounted on a distal end of the work head for contacting a weld bead when the tool is in the insertion position; and
a rotary multifluted cutter mounted on the output shaft in longitudinal alignment with the locating gauge;
the cutter having a plurality of cutting flutes oriented relative to the predetermined angle of the motor output shaft so that the flutes are substantially parallel to the interior wall of the pipe when the tool is in the cutting position for cutting the weld bead.
2. A work head according to claim 1 in which the frame is mounted on a transverse track and the cutting motor is fixed to the frame.
3. A work head according to claim 1 in the frame is affixed to the distal end of the torque tube and the cutting motor is pivotally mounted on the frame.
4. A work head according to claim 1 including a means mounted on the locating gauge for engaging a pipe cleaning tool to pull through the pipe after cutting the weld bead.
5. A work head according to claim 4 including a pipe cleaning tool for removal of chips and fines from inside a butt-welded plastic pipe, the pipe cleaning tool comprising:
at least one cleaning disk mounted on an axial shaft; and
an engagement structure mounted on the shaft in position to be engaged by the means for engaging for retraction from the pipe;
the disk having a diameter sized to an inside diameter of the pipe to sweep fines and chips therefrom when pulled through the pipe.
6. A work head according to claim 1 in which the rotary multifluted cutter includes:
a shank;
a plurality of flutes disposed helically around the shank and oriented at an angle relative to the shank so as to taper inward proceeding from the shank toward a distal end of the cutter; and
a circular bearing mounted at the distal end of the cutter defining a gauge for maintaining the flutes substantially parallel to a sidewall of the pipe.
7. A work head according to claim 6 in which the flutes are each curved arcuately about a predetermined radius such that the cutter has a maximum radius midway between the shank and the distal end.
8. A work head according to claim 6 in which the flutes are angled at about 12 degrees relative to the shank and are curved about approximately a 3.5 inch (8.9 cm.) radius.
9. A method of debeading a joint in a butt-welded plastic pipe, comprising:
inserting a rotary cutting motor having an output shaft and a rotary multifluted cutter mounted on the output shaft lengthwise inside a butt-welded plastic pipe while retaining the cutting motor and cutter in an insertion position spaced away from an interior wall of the pipe;
positioning the rotary cutting motor lengthwise in the pipe so that the rotary multifluted cutter is located radially adjacent a butt-weld bead in the pipe;
moving the cutting motor transversely between the insertion position and a cutting position in which the motor output shaft is oriented in a cutting position at a predetermined angle relative to an axis of the pipe so that the cutter engages the butt-weld bead; and
operating the cutting motor to cut the butt-weld bead while rotating the cutting motor around the inside of the pipe;
the cutter having a plurality of cutting flutes oriented relative to the predetermined angle of the motor output shaft so that the flutes are substantially parallel to the interior wall of the pipe when the tool is in the cutting position.
10. A method according to claim 8 in which the positioning step includes locating the cutting motor by detecting the butt-weld bead during insertion and fixing the cutting motor longitudinally in the pipe to retain the cutter adjacent the butt-weld bead.
11. A method according to claim 8 including:
inserting a pipe cleaning tool for removal of chips and fines into the butt-welded plastic pipe prior to inserting the rotary cutting motor, the pipe cleaning tool comprising:
at least one cleaning disk mounted on an axial shaft; and
an engagement structure mounted on the shaft in position to be engaged by a debeading tool for retraction from the pipe;
the disk having a diameter sized to an inside diameter of the pipe to sweep fines and chips therefrom when pulled through the pipe; and
after operating the cutting motor to cut the butt-weld bead, with drawing the rotary cutting motor and the pipe cleaning tool from the pipe.
12. A pipe cleaner for removal of chips and fines from inside a butt-welded plastic pipe, comprising:
at least one cleaning disk mounted on an axial shaft; and
an engagement structure mounted on the shaft in position to be engaged by a debeading tool for retraction from the pipe;
the disk having a diameter sized to an inside diameter of the pipe to sweep fines and chips therefrom when pulled through the pipe.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/186,090 US20080292417A1 (en) | 2006-09-13 | 2008-08-05 | Debeading tool for butt-welded plastic pipe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/531,622 US7422399B1 (en) | 2006-09-13 | 2006-09-13 | Debeading tool for butt-welded plastic pipe |
US12/186,090 US20080292417A1 (en) | 2006-09-13 | 2008-08-05 | Debeading tool for butt-welded plastic pipe |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/531,622 Division US7422399B1 (en) | 2006-09-13 | 2006-09-13 | Debeading tool for butt-welded plastic pipe |
Publications (1)
Publication Number | Publication Date |
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US20080292417A1 true US20080292417A1 (en) | 2008-11-27 |
Family
ID=39734290
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/531,622 Expired - Fee Related US7422399B1 (en) | 2006-09-13 | 2006-09-13 | Debeading tool for butt-welded plastic pipe |
US12/186,090 Abandoned US20080292417A1 (en) | 2006-09-13 | 2008-08-05 | Debeading tool for butt-welded plastic pipe |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/531,622 Expired - Fee Related US7422399B1 (en) | 2006-09-13 | 2006-09-13 | Debeading tool for butt-welded plastic pipe |
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US (2) | US7422399B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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NO331858B1 (en) * | 2010-03-05 | 2012-04-23 | Mech As | Device at remote, submarine machining unit |
FR2966756B1 (en) * | 2010-11-02 | 2013-08-23 | Snecma | METHOD FOR MACHINING A CASE OF AN AIRCRAFT TURBOMOTOR AND SCRAP TOOL FOR IMPLEMENTING THE METHOD |
NO335796B1 (en) * | 2011-01-27 | 2015-02-16 | Oceaneering Mech As | Machining apparatus |
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