WO2023127301A1 - Internal bead processing device - Google Patents

Internal bead processing device Download PDF

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Publication number
WO2023127301A1
WO2023127301A1 PCT/JP2022/040951 JP2022040951W WO2023127301A1 WO 2023127301 A1 WO2023127301 A1 WO 2023127301A1 JP 2022040951 W JP2022040951 W JP 2022040951W WO 2023127301 A1 WO2023127301 A1 WO 2023127301A1
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WO
WIPO (PCT)
Prior art keywords
mandrel
bead
rod
welded steel
chopping
Prior art date
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PCT/JP2022/040951
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French (fr)
Japanese (ja)
Inventor
智康 中野
飛舟 王
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株式会社中田製作所
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Publication of WO2023127301A1 publication Critical patent/WO2023127301A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D1/00—Planing or slotting machines cutting by relative movement of the tool and workpiece in a horizontal straight line only
    • B23D1/20—Planing or slotting machines cutting by relative movement of the tool and workpiece in a horizontal straight line only with tool-supports or work-supports specially mounted or guided for working in different directions or at different angles; Special purpose machines
    • B23D1/24—Planing or slotting machines cutting by relative movement of the tool and workpiece in a horizontal straight line only with tool-supports or work-supports specially mounted or guided for working in different directions or at different angles; Special purpose machines for planing inner surfaces, e.g. of moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/08—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for flash removal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools

Definitions

  • the present invention is an inner surface bead processing apparatus for continuously cutting a bead on the inner surface of a steel pipe generated during the manufacture of a welded steel pipe, and then cutting the long striped bead into short pieces or bending the bead at appropriate intervals.
  • it relates to an inner surface bead processing apparatus capable of cutting the bead after cutting even for a small diameter pipe.
  • the internal bead processing equipment used in the production of welded steel pipes by high-frequency welding which is typical for high-frequency welding, is upstream of the squeeze roll stand that performs high-frequency welding, and the raw material pipe formed into a semi-cylindrical shape during roll forming is exposed from the open top. , constitute the tip of a rod-shaped mandrel that is inserted toward the downstream side along which the blank pipe advances.
  • An impeder core section is connected to the central section on the downstream side from the base end section where the mandrel is supported, for the purpose of improving the efficiency of induction heating, and a trimmer section that removes the inner surface bead at the mandrel tip section on the downstream side. (Internal bead processing device) is connected.
  • This trimmer first performs a scarfing process that continuously cuts the bead on the inner surface of the pipe, and then a chopping process that cuts the bead that becomes long and streaky after cutting, or a nicking process that creases at appropriate intervals. processing.
  • the mandrel is inserted into the blank pipe from the opening on the upstream side of the blank pipe toward the downstream side in a cantilever configuration, and the cutting tool provided on the upper surface of the tip side of the trimmer part is exposed to the inner surface of the blank pipe.
  • This is done by a mechanism that contacts and cuts the bead with an appropriate load. Therefore, it is necessary to incorporate a plurality of rollers for rolling on the inner surface of the pipe in the trimmer portion, and to adjust and hold the contact position of the cutting bit.
  • the inner diameter of the pipe is 42 mm and the amount of bead is large.
  • the outer diameter of the trimmer section containing the chopping mechanism must be reduced.
  • Patent Document 1 a tool holder is provided at the center of the upper surface of the mandrel tip side, and the bead cut by the tool is mounted on a fixed blade provided in the middle of the passage hole, and a hydraulic cylinder protruding from the center of the tip surface of the trimmer part. 1 shows a configuration in which cutting is performed by reciprocating motion of a piston rod and a moving blade at the tip of the piston rod.
  • Patent document 2 shows a bead cutting and shredding mechanism similar to that of patent document 1, in which a hydraulic cylinder as a drive source is attached so as to be held by the lower surface of the trimmer portion on the tip end side of the mandrel.
  • Patent Document 3 shows a bead cutting and shredding mechanism similar to that of Patent Document 2, in which a hydraulic cylinder as a drive source is built in the mandrel on the upstream side of the cutting bit on the tip side of the mandrel.
  • the inner diameter is determined according to the dimensions of the desired pipe product.In the case of a small diameter and wall thickness, the inner diameter is particularly small. In the arrangement configuration of the drive source described above, it is extremely difficult to design a two-party design for securing the rigidity of the entire device as well as miniaturization.
  • This invention has a simple mechanism that does not interfere with the chopping mechanism that is installed at the same time when designing the arrangement of the cutting tool, roller, and their position adjustment mechanism in the trimmer part of the mandrel used for manufacturing small-diameter pipes.
  • the purpose is to provide equipment.
  • the inventors of the present invention conducted various studies on the arrangement of the drive source for the purpose of a chopping mechanism that operates simply and reliably in the trimmer section of the mandrel used in the manufacture of small-diameter thick steel pipes.
  • the horizontal rod is mounted inside and outside the mandrel, extends to the open side of the blank tube that supports the mandrel on the upstream side, and places the drive source on the side of the mandrel support.
  • the inventors further studied various mechanical mechanisms for transmitting the input from the drive source arranged on the support side to the horizontally arranged rod.
  • the end is connected to the horizontal rod as a sliding end, and the input rod from the drive source is pivotally attached to the connection point of the link.
  • the inventors have found that an input conversion link mechanism having a configuration that is optimal for a chopping machine mechanism, and completed the present invention.
  • the present invention provides a scarfing mechanism for cutting beads formed on the inner surface of a welded steel pipe during pipemaking, and a chopping mechanism for chopping the streak-shaped beads after continuous scarfing to a required length.
  • the chopping mechanism includes a fixed blade disposed near the exit of the bead passage hole of the scarfing mechanism provided on the tip side of the mandrel, and tips of a pair of split rods horizontally movably mounted on the mandrel and reciprocating.
  • connection link connecting two links of the same length or different lengths is pivotally attached to the mandrel so as to be a fixed end, and the other end of the connection link is fixed.
  • An input conversion link mechanism having a configuration in which the transmission rod moves linearly with bending motion is positioned on the rear end side of the mandrel and used,
  • the transmission rod is connected to a reciprocating rod which is connected to the rear ends of the split rods and is horizontally movably mounted on the mandrel.
  • the present invention also provides an inner bead processing apparatus for welded steel pipes having the above-described configuration, wherein the drive source is located at the mandrel supporting portion on the rear end side of the mandrel.
  • the present invention also provides an inner bead treatment apparatus for welded steel pipes having the above configuration, wherein the drive source is a fluid pressure cylinder.
  • the present invention also provides an inner bead treatment apparatus for welded steel pipes having the above configuration, wherein the drive source is a rotary motor.
  • the present invention also provides an inner bead treatment apparatus for welded steel pipes having the above structure, wherein the movable blade is for nicking.
  • the chopping mechanism is a one-way chopping mechanism by means of a link mechanism that converts vertical motion from a drive source into horizontal motion.
  • a link mechanism that converts vertical motion from a drive source into horizontal motion.
  • the rods are arranged linearly on the exterior and interior of the trimmer main body, and one rod reciprocates linearly, and the bending rigidity of the rod does not affect bead breakage at all.
  • FIG. 1 is an explanatory view of the horizontal outer peripheral surface and the cantilever support portion of the distal end side trimmer portion of the mandrel, showing the arrangement configuration of the chopping mechanism.
  • FIG. 2 is a perspective explanatory view showing the configuration of the rod of the chopping mechanism.
  • 3A, 3B, and 3C are explanatory diagrams showing the drive source of the input conversion link mechanism.
  • FIG. 4 is an explanatory diagram showing the entire mandrel of Example 1.
  • FIG. FIG. 5 is a vertical sectional explanatory view of the trimmer section and the drive source of Example 1.
  • FIG. FIG. 6 is a perspective explanatory view showing a trimmer portion of Examples 2 and 3.
  • the right side of the cutaway view is located upstream of the blank pipe during pipe making (not shown) when the mandrel is used, and the mandrel is fixed to the lower end of the hang arm 2 that supports the mandrel 1 in a cantilever manner. It is the proximal end 3 of 1.
  • the left side of the cutaway view is located downstream of the blank pipe, and is the trimmer portion 6 on the tip side of the mandrel 1.
  • the cutaway portion not shown is the extension portion 4 connected to the base end portion 3 and the impeder core portion. 5 (see Figure 4).
  • the hang arm 2 is supported by a stand or the like, which is not shown, outside the open portion of the blank tube.
  • FIG. 2 shows rods composed of a moving blade of a chopping mechanism 10 that cuts beads by horizontal reciprocating motion of a moving blade with respect to a fixed blade arranged near the exit of a bead passage hole of the scarfing mechanism, and rods that reciprocate the moving blade.
  • a pair of split rods 13, 13 holding a plate-shaped movable blade 11 from the downstream side with a holder part 12 at the tip thereof are arranged opposite to each other and form a rectangular frame together with a connecting part 14 that connects the rear ends of the split rods 13, 13. do.
  • the reciprocating rod 15 connected via the connecting portion 14 has a round bar shape and is connected via a transmission rod 27 to an input conversion link mechanism 20 (simply referred to as a link mechanism 20).
  • the split rods 13, 13 in FIG. 2 are externally arranged in horizontal grooves provided at a horizontal position on the outer peripheral surface of the trimmer part 6 in FIG.
  • the impeder core portion 5 and the mandrel extending portion 4 are inserted through the central portion of the upstream portion of the mandrel extending portion 4, and are connected to the link mechanism 20 via the transmission rod 27 at the base end portion 3 position. .
  • the rods of the chopping mechanism are arranged linearly on the exterior and interior of the trimmer unit 6 body, and one rod reciprocates linearly. It does not affect.
  • the link mechanism 20 is composed of a pair of link plates of the same length which are connected by pivot pins to form one link 21, two links 21 are connected by pivot pins 22 to form a connection link 23, and the pivot pins 22 are pivotally connected to an input rod 26.
  • the connecting link 23 In order to make the upstream side of the connecting link 23 a fixed end 24, it is pivotally attached to the base end portion 3 with a pivot pin, and to make the downstream side of the other connecting link 23 a sliding end 25. , is pivotally attached by a pivot pin to a transmission rod 27 held in a low-friction collar in a through hole in extension 4 .
  • a hydraulic cylinder 31 is built in the hang arm 2 as a drive source 30, the input rod 26 is connected to the cylinder rod 32, and the connecting link 23 is pulled up and bent.
  • the sliding end 25 can strongly push the transmission rod 27, causing the moving blade 11 at the tip of the chopping mechanism 10 to horizontally move downstream. be able to. Furthermore, when the hydraulic cylinder 31 pushes down the input rod 26 and the connecting link 23 is bent, the moving blade 11 can be returned upstream.
  • the link mechanism 20 can reciprocate the reciprocating rod 15 twice in one stroke of lowering and ascending of the hydraulic cylinder 31, and can push the reciprocating rod 15 most strongly when the connecting link 23 is straightened, cutting the bead. You get the effect of increasing your strength.
  • a linear motion hydraulic cylinder as well as a rotary motion can be used. As shown in FIG.
  • the rotating shaft 33 rotates by an electric or fluid pressure motor, the rotary motion is converted into a linear motion. makes two round trips.
  • a rotating crank mechanism can be employed instead of the rotating shaft 33 of FIG.
  • the chopping mechanism of the above configuration is one-way chopping by a link mechanism that converts vertical motion from the drive source into horizontal motion. does not require Furthermore, in order to control the timing of chopping, by appropriately adopting a mechanical mechanism such as an intermittent rotary motion mechanism or an intermittent reciprocating motion mechanism between the input rod of the link mechanism and the rotary motor, the desired intermittent motion is
  • the reciprocating rod can be reciprocated, and only a mechanical mechanism is intervened, and high-precision control is not required.
  • FIG. 1 details of the cutting tool, the upper roller, and the lower roller that are essential to the trimmer portion 6 (the same configuration as in FIG. 6 of Embodiment 2) are not described, but the central portion of the upper surface of the single metal bar-shaped trimmer portion 6
  • the chopping mechanism 10 can be divided even if the cutting tool, the upper roller, and the lower roller are appropriately arranged, such as by providing a cutting tool holder groove, an upper roller storage hole, and a groove in the bottom surface of the trimmer part 6, and providing a storage hole for the lower roller in the center of the lower surface of the trimmer part 6.
  • the rod 13 is arranged in a horizontal groove provided at a horizontal position on the outer peripheral surface of the trimmer portion 6 .
  • the tip holder part 12 of the split rod 13 attached to the trimmer part 6 is positioned near the passage hole of the bead cut by the cutting tool at the tip part of the trimmer part 6. Since the chopping function can be exhibited only by arranging so that it can move horizontally, it is a simple structure that does not hinder the arrangement of the cutting tool, upper roller, and lower roller that are essential for the trimmer section 6 at all.
  • the drawing shows a configuration in which the driving source of the chopping mechanism is in the hang arm. , can be pulled out and placed off-line from above the mandrel proximal end.
  • various mechanical motion mechanisms such as a mechanism that converts the linear motion of a hydraulic cylinder into a rotary motion using a rack and pinion instead of a rotary motor, a mechanism that rotates a lever with a hydraulic cylinder, etc.
  • Various power sources can be utilized by appropriately interposing the .
  • Example 1 The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 50 mm, a maximum wall thickness of 4 mm, and a minimum inner diameter of 42 mm.
  • the internal bead processing equipment used uses a nail bit to cut the bead, and the outer diameter of the trimmer part is 32 mm. Description will be made based on FIGS. 4 and 5.
  • FIG. The right side of the figure is the upstream side of pipe making, and the left side is the downstream side. Also, in order to show the positional relationship with the blank pipe being manufactured, the cross section of the blank pipe is illustrated, but the image shown does not match the dimensional ratio of the apparatus.
  • the mandrel 1 is composed of a base end portion 3 connected to a hang arm 2 from the upstream side, an extension portion 4, an impeder core portion 5, and a trimmer portion 6 on the tip side.
  • a resin tube 7 protrudes from the upper surface of the impeder core portion 5 on the upstream side, and the cooling water supplied from the hang arm 2 to the tip of the impeder core portion 5 through the piping in the extension portion 4 returns to the upstream side of the same portion, It can be ejected to the outside of the open base pipe.
  • the welding point of the squeeze roll is positioned at the tip position of the impy core portion 5 during pipe making.
  • the trimmer portion 6 has a bead passing hole 52 formed by fixing a tool holder 50 for fixing a nail bit 51 on the upper surface of the tip.
  • Carbide tip is fixed by brazing.
  • An upper roller 40 is pivotally supported in a hole immediately downstream of the upper roller 40, and the lower roller 42 is held by an L-shaped roller holder 43 that is pivotally supported at a position upstream of the upper roller 40.
  • the pull rod 44 that is housed on the lower surface side and connected to the bent portion of the roller holder 43, the lower roller 42 descends and abuts against the inner surface of the blank tube to apply a pressing force to the nail bite 51.
  • a second upper roller 41 is arranged on the upper surface of the lower roller 42 further upstream.
  • the pull rod 44 is arranged over the entire length of the lower surface of the mandrel 1 and is connected to the lower end of a pivoted lever 45 at the base end 3 to lower the hydraulic cylinder 34 vertically built in the holder arm 2.
  • a rod pivoted to the upper end of the lever 45 is connected to the cylinder rod thus pulled, and the pull rod 44 is pulled upstream in the upward stroke of the cylinder rod of the hydraulic cylinder 34 to lower the lower roller 42 .
  • the lower roller 42 is retracted.
  • a fixed blade 53 is attached near the exit of the bead passage hole 52 on the lower surface side of the tip of the trimmer portion 6 .
  • the upper surface of the movable blade 11 held by the holder portion 12 at the tip of the chopping mechanism serves as a bead passage hole.
  • the bottom side of the fixed blade 53 at the exit 52 is moved horizontally.
  • the holder part 12 is held by a split rod that horizontally slides in a horizontal groove in the center of the side surface of the trimmer part 6, is connected to a reciprocating rod 15 via a connecting part 14, and is connected to a link mechanism 20 at the base end part 3. is connected to the transmission rod 27 of the A hydraulic cylinder 31 vertically built in the arm 2 is used as the power source 30 of the chopping mechanism.
  • the trimmer unit 6 configured as described above has the nail bit 51, the upper rollers 40, 41, and the lower roller 42 arranged as required, and furthermore, the chopping mechanism can be arranged externally or internally, and its outer diameter can be 32 mm. did it.
  • the trimmer section 6 can maintain a sufficient space inside the blank tube with a planned minimum inner diameter of 42 mm, and the lower roller 42 can be lowered by the hydraulic cylinder 34 outside the blank tube.
  • the chopping mechanism was able to continuously chop the bead cut by applying a cutting load in 0.05 seconds reciprocating with a stroke of 11 mm of the moving blade.
  • Example 2 The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 60.3 mm, a maximum wall thickness of 5 mm, and a minimum inner diameter of 50.3 mm.
  • the mandrel to be used has a configuration similar to that of Example 1, although enlarged, and a ring bit is used for cutting the inner surface bead, and the outer diameter of the trimmer portion is 40 mm. Description will be made based on FIG.
  • a ring bit 54 is attached to the bead passage hole 52 which is inclined from the upper surface of the trimmer portion 6 on the tip side of the main body, and a fixed blade is attached from the lower surface side near the exit of the bead passage hole.
  • a bent roller arm 47 is pivotally arranged so that the lower roll 46 can be raised and lowered from the lower surface of the bead passage hole 52 on the upstream side close to the ring bite 54, and a push rod 48 is connected to the rear end of the arm, and the trimmer portion 6 A required load can be applied to the ring bite 54 by lowering the lower roller 46 with a hydraulic cylinder built in the main body.
  • the lower roller 46 is arranged near the lower side of the ring bite 54, and the upper roll 49 is relatively spaced upstream and pivotally supported by a pin.
  • the chopping mechanism has the same configuration as described with reference to FIGS. 1 and 2 above.
  • the trimmer unit 6 configured as described above has the ring bite 54 and the upper roller 49 arranged as required, the lower roller 46 and the hydraulic cylinder of the driving source are arranged inside, and the chopping mechanism 10 can be arranged externally or internally. Its outer diameter could be 40 mm.
  • chopping can be changed to nicking by exchanging the movable blade.
  • bead passage hole 52 and the ring bite 54 are located at the same position at the tip of the trimmer portion 6, so there are few parts that hinder the passage of the bead, and bead clogging is less likely to occur.
  • Example 3 The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 73 mm, a maximum wall thickness of 7 mm, and a minimum inner diameter of 59 mm.
  • the mandrel to be used has the same configuration as that of Example 2, although it is enlarged, and a ring bit is used for cutting the inner surface bead, and the outer diameter of the trimmer portion is 48 mm.
  • Example 2 the lower roll was moved up and down using a lever pressing rod, and a hydraulic cylinder was horizontally built in as a drive source.
  • the driving source of the chopping mechanism is a rotating shaft type and is rotated by an electric motor.
  • the distance from the squeeze point to the ring bite can be shortened to about 540mm, and the cutting resistance of the bead is small, enabling low-load scarfing and chopping.
  • Example 4 The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 89.1 mm, a maximum wall thickness of 8 mm, and a minimum inner diameter of 73.1 mm. A mandrel having the same structure as in Example 3 was used, and the lower roller was replaced with one having a larger outer diameter.
  • the distance from the squeeze point to the ring bite can be shortened to about 540mm, and the cutting resistance of the bead is small, enabling low-load scarfing and chopping.
  • Example 5 The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 114.3 mm, a maximum wall thickness of 10 mm, and a minimum inner diameter of 94.3 mm.
  • the mandrel to be used has the same structure as that of Examples 3 and 4, although enlarged, and a ring bit is used for cutting the inner bead, and the outer diameter of the trimmer portion is 83 mm.
  • the distance from the squeeze point to the ring bite can be shortened to about 660mm, and the cutting resistance of the bead is small, enabling low-load scarfing and chopping.
  • the simple structure of the chopping mechanism can be adopted, the distance from the squeeze point to the ring bite can be shortened, the cutting resistance of the bead is small, and low-load scarfing and chopping are possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Milling, Broaching, Filing, Reaming, And Others (AREA)
  • Tyre Moulding (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

The purpose of the present invention is to provide a simple structure that does not interfere with a chopping mechanism, in a bead processing part of a mandrel for use in manufacturing a small-diameter pipe. In order to achieve such structure, a reciprocating rod 15 for horizontally moving a movable blade 11 is mounted inside and outside a mandrel 1 and extended to an open side of a raw pipe that supports the mandrel 1 on an upstream side, and a drive source 30 is disposed on a support part side. As a machine mechanism for transmitting an input from the drive source 30 to the reciprocating rod 15, an input conversion link mechanism is employed, wherein one end of a joint link 23 joining two links 21 is a fixed end 24, another end thereof is connected as a slidable end 25 to the reciprocating rod 15, an input rod 26 from the drive source 30 is pivotally attached to the joint point of the joint link 23, and the reciprocating rod 15 is caused to move linearly by motion of the joint link 23 which is straightened and bent by the input rod 26.

Description

内面ビード処理装置Inner bead processing equipment
この発明は、溶接鋼管の製造の際に発生する鋼管内面のビードを連続的に切削した後、長く条状となるビードを短く寸断処理、または適宜の間隔で折り曲げ処理のための内面ビード処理装置に関し、特に小径管であってもビードの切削後の寸断が可能な内面ビード処理装置に関する。 The present invention is an inner surface bead processing apparatus for continuously cutting a bead on the inner surface of a steel pipe generated during the manufacture of a welded steel pipe, and then cutting the long striped bead into short pieces or bending the bead at appropriate intervals. In particular, it relates to an inner surface bead processing apparatus capable of cutting the bead after cutting even for a small diameter pipe.
溶接鋼管の代表的な高周波溶接による造管に際して使用される内面ビード処理装置は、高周波溶接を行うスクイズロールスタンドの上流側で、ロール成形途中の半円筒状に成形された素管の開放上部より、素管が進む下流側に向かって挿入される棒状のマンドレルの先端部を構成する。マンドレルが支持される基端部から下流側の中央部に、誘導加熱の効率向上を目的としたインピーダコア部が接続され、さらにその下流側のマンドレル先端部に内面ビードの除去処理を行うトリマー部(内面ビード処理装置)が接続されている。 The internal bead processing equipment used in the production of welded steel pipes by high-frequency welding, which is typical for high-frequency welding, is upstream of the squeeze roll stand that performs high-frequency welding, and the raw material pipe formed into a semi-cylindrical shape during roll forming is exposed from the open top. , constitute the tip of a rod-shaped mandrel that is inserted toward the downstream side along which the blank pipe advances. An impeder core section is connected to the central section on the downstream side from the base end section where the mandrel is supported, for the purpose of improving the efficiency of induction heating, and a trimmer section that removes the inner surface bead at the mandrel tip section on the downstream side. (Internal bead processing device) is connected.
このトリマー部は、まず、管内面のビードを連続的に切削するスカーフィング処理を行うもので、さらに、切削後に長く条状となるビードを寸断するチョッピング処理、あるいは適宜の間隔で折り目をつけるニッキング処理を行うものである。 This trimmer first performs a scarfing process that continuously cuts the bead on the inner surface of the pipe, and then a chopping process that cuts the bead that becomes long and streaky after cutting, or a nicking process that creases at appropriate intervals. processing.
スカーフィング処理は、マンドレルを素管上流側の前記の開口部から下流側に向かって片持ち構成で素管内に挿入して、トリマー部の先端側上面に設けたバイトが、素管内面に露出するビードに適切な荷重で当接してこれを切削する機構で行う。よって、トリマー部には管内面を転動する複数のローラを内蔵し、かつ切削用のバイトの当接位置の調整を行い、これを保持する必要がある。 In the scarfing process, the mandrel is inserted into the blank pipe from the opening on the upstream side of the blank pipe toward the downstream side in a cantilever configuration, and the cutting tool provided on the upper surface of the tip side of the trimmer part is exposed to the inner surface of the blank pipe. This is done by a mechanism that contacts and cuts the bead with an appropriate load. Therefore, it is necessary to incorporate a plurality of rollers for rolling on the inner surface of the pipe in the trimmer portion, and to adjust and hold the contact position of the cutting bit.
従って、トリマー部には、バイト、ローラとその位置調整機構、チョッピング機構を備える必要があり、例えば、管内径が50mm程度以下になると、各機構を内蔵配置するには、小型化ともに装置全体の剛性を確保しなければならず、設計に困難を極めることになる。 Therefore, it is necessary to equip the trimmer with a bit, a roller, a mechanism for adjusting their position, and a chopping mechanism. Rigidity must be ensured, which makes the design extremely difficult.
特に、外径50mm、肉厚4mmの小径肉厚の場合は管内径が42mmでかつビード量も多くなり、ビードを安定的に切削できたとしても、ビードが通る隙間を確保しなければならず、チョッピング機構を内蔵するトリマー部はその外径を小さくする必要がある。 In particular, in the case of a small pipe with an outer diameter of 50 mm and a wall thickness of 4 mm, the inner diameter of the pipe is 42 mm and the amount of bead is large. , the outer diameter of the trimmer section containing the chopping mechanism must be reduced.
実開昭53-93530号明細書Japanese Utility Model Laid-Open No. 53-93530 特開平9-103910号公報JP-A-9-103910 特開平10-193284号公報JP-A-10-193284
特許文献1には、マンドレル先端側の上面中央部にバイトホルダーを設けてバイトで切削したビードはその通過孔の途中に設けた固定刃と、トリマー部最先端面の中央に突設した油圧シリンダのピストロッドの先端の移動刃とで、該ロッドの往復動で切断する構成が示されている。 In Patent Document 1, a tool holder is provided at the center of the upper surface of the mandrel tip side, and the bead cut by the tool is mounted on a fixed blade provided in the middle of the passage hole, and a hydraulic cylinder protruding from the center of the tip surface of the trimmer part. 1 shows a configuration in which cutting is performed by reciprocating motion of a piston rod and a moving blade at the tip of the piston rod.
特許文献2には、特許文献1同様のビードの切削、寸断機構において、駆動源の油圧シリンダはマンドレル先端側のトリマー部の下面に抱くように着設されている構成が示される。 Patent document 2 shows a bead cutting and shredding mechanism similar to that of patent document 1, in which a hydraulic cylinder as a drive source is attached so as to be held by the lower surface of the trimmer portion on the tip end side of the mandrel.
特許文献3には、特許文献2と同様のビードの切削、寸断機構において、駆動源の油圧シリンダはマンドレル先端側の切削バイトよりも上流側のマンドレル内に内蔵されている構成が示される。 Patent Document 3 shows a bead cutting and shredding mechanism similar to that of Patent Document 2, in which a hydraulic cylinder as a drive source is built in the mandrel on the upstream side of the cutting bit on the tip side of the mandrel.
造管に際し、目的とする管製品寸法に応じて内径寸法が決まり、小径肉厚の場合には特に内径が小さく、トリマー部に、バイト、ローラとその位置調整機構、チョッピング機構を配置するには、上述の駆動源の配置構成では、小型化ともに装置全体の剛性を確保するための二者反目の設計に困難を極めることになる。 When making pipes, the inner diameter is determined according to the dimensions of the desired pipe product.In the case of a small diameter and wall thickness, the inner diameter is particularly small. In the arrangement configuration of the drive source described above, it is extremely difficult to design a two-party design for securing the rigidity of the entire device as well as miniaturization.
この発明は、小径管の製造に使用されるマンドレルのトリマー部に、バイト、ローラとその位置調整機構を配置する設計に際し、同時搭載するチョッピング機構がその妨げとならない簡素な機構を有する内面ビード処理装置の提供を目的としている。 This invention has a simple mechanism that does not interfere with the chopping mechanism that is installed at the same time when designing the arrangement of the cutting tool, roller, and their position adjustment mechanism in the trimmer part of the mandrel used for manufacturing small-diameter pipes. The purpose is to provide equipment.
発明者らは、小径肉厚鋼管の製造に際し使用されるマンドレルのトリマー部において、簡素かつ確実に作動するチョッピング機構を目的に、駆動源の配置について種々検討した結果、移動刃を水平動させるための水平ロッドはマンドレルに内装、外装させて、マンドレルを上流側で支持する素管開放側まで前記水平ロッドを延長し、マンドレル支持部側に駆動源を配置する構成に着目した。 The inventors of the present invention conducted various studies on the arrangement of the drive source for the purpose of a chopping mechanism that operates simply and reliably in the trimmer section of the mandrel used in the manufacture of small-diameter thick steel pipes. The horizontal rod is mounted inside and outside the mandrel, extends to the open side of the blank tube that supports the mandrel on the upstream side, and places the drive source on the side of the mandrel support.
発明者らは、さらに水平配置のロッドに支持部側に配置する駆動源からの入力を伝達する機械機構について種々検討した結果、二つのリンクを連結した連結リンクの一方端を固定端とし、他方端を摺動端として水平ロッドに接続し、リンクの連結点に駆動源からの入力ロッドを枢着し、連結リンクが入力ロッドにより直線化、屑曲化する運動にて水平伝達ロッドが直線動する構成の入力変換リンク機構が、チョッピングの機械機構に最適であることを知見し、この発明を完成した。 The inventors further studied various mechanical mechanisms for transmitting the input from the drive source arranged on the support side to the horizontally arranged rod. The end is connected to the horizontal rod as a sliding end, and the input rod from the drive source is pivotally attached to the connection point of the link. The inventors have found that an input conversion link mechanism having a configuration that is optimal for a chopping machine mechanism, and completed the present invention.
すなわち、この発明は、造管中に溶接鋼管の管内面に生成するビードを切削するスカーフィング機構と、連続的にスカーフィング処理した後の条状ビードを所要長さで寸断処理するためのチョッピング機構とを備え、スクイズロールスタンドの上流側の素管開放部より同スタンドの下流側の素管内に挿入されるマンドレルに装着される溶接鋼管の内面ビード処理装置において、
前記チョッピング機構は、前記マンドレルの先端側に設けた前記スカーフィング機構のビード通過孔の出口付近に配置する固定刃と、前記マンドレルに水平動可能に装着されて往復動する一対の分割ロッドの先端に設けた移動刃とで、切削後の内面ビードを寸断する構成を有し、
前記チョッピング機構における前記分割ロッドの往復動駆動には、同長または異長の二つのリンクを連結した連結リンクの一方端を固定端とするため前記マンドレルに枢着し、前記連結リンクの他方端を、前記マンドレル内で摺動端として直線動を伝達する伝達ロッドに接続し、前記連結リンクの連結点に駆動源からの入力ロッドを枢着し、前記連結リンクが前記入力ロッドにより直線化、屈曲化する運動にて前記伝達ロッドが直線動する構成の入力変換リンク機構が、前記マンドレルの後端側に位置して用いられ、
前記伝達ロッドには、前記分割ロッドの後端に接続して前記マンドレルに水平動可能に装着される往復ロッドが接続されることを特徴とする溶接鋼管の内面ビード処理装置である。 That is, the present invention provides a scarfing mechanism for cutting beads formed on the inner surface of a welded steel pipe during pipemaking, and a chopping mechanism for chopping the streak-shaped beads after continuous scarfing to a required length. A device for treating the inner surface bead of a welded steel pipe, which is attached to a mandrel inserted into a blank pipe on the downstream side of a squeeze roll stand from the blank pipe opening on the upstream side of the stand, comprising a mechanism,
The chopping mechanism includes a fixed blade disposed near the exit of the bead passage hole of the scarfing mechanism provided on the tip side of the mandrel, and tips of a pair of split rods horizontally movably mounted on the mandrel and reciprocating. With a moving blade provided in, it has a configuration that shreds the inner surface bead after cutting,
For the reciprocating drive of the split rod in the chopping mechanism, one end of a connection link connecting two links of the same length or different lengths is pivotally attached to the mandrel so as to be a fixed end, and the other end of the connection link is fixed. is connected to a transmission rod that transmits linear motion as a sliding end within the mandrel, an input rod from a drive source is pivotally attached to the connection point of the connection link, and the connection link is linearized by the input rod, An input conversion link mechanism having a configuration in which the transmission rod moves linearly with bending motion is positioned on the rear end side of the mandrel and used,
The transmission rod is connected to a reciprocating rod which is connected to the rear ends of the split rods and is horizontally movably mounted on the mandrel.
また、この発明は、上記構成の内面ビード処理装置において、駆動源がマンドレル後端側のマンドレル支持部にある、溶接鋼管の内面ビード処理装置である。 The present invention also provides an inner bead processing apparatus for welded steel pipes having the above-described configuration, wherein the drive source is located at the mandrel supporting portion on the rear end side of the mandrel.
また、この発明は、上記構成の内面ビード処理装置において、駆動源が流体圧シリンダである、溶接鋼管の内面ビード処理装置である。 The present invention also provides an inner bead treatment apparatus for welded steel pipes having the above configuration, wherein the drive source is a fluid pressure cylinder.
また、この発明は、上記構成の内面ビード処理装置において、駆動源が回転モータである、溶接鋼管の内面ビード処理装置である。 The present invention also provides an inner bead treatment apparatus for welded steel pipes having the above configuration, wherein the drive source is a rotary motor.
また、この発明は、上記構成の内面ビード処理装置において、移動刃がニッキング用である、溶接鋼管の内面ビード処理装置である。 The present invention also provides an inner bead treatment apparatus for welded steel pipes having the above structure, wherein the movable blade is for nicking.
この発明において、チョッピング機構は、駆動源からの垂直動が水平動に変換されるリンク機構によるワンウエイ方式のチョッピングであり、また、駆動源は流体圧シリンダや回転モータのみで、何ら複雑、高精度の制御を必要とせず、結果、トリマー部に必須のバイト、上ローラ、下ローラの配置に一切妨げにならない、簡素な構成である。 In the present invention, the chopping mechanism is a one-way chopping mechanism by means of a link mechanism that converts vertical motion from a drive source into horizontal motion. As a result, it is a simple structure that does not interfere with the arrangement of the cutting tool, the upper roller, and the lower roller that are essential to the trimmer section.
また、ロッド類は、トリマー部本体に直線的に外装・内装配置されており、1本のロッドが直線的に往復動する構成であり、ロッドの曲げ剛性はビードの寸断に全く影響しない。 In addition, the rods are arranged linearly on the exterior and interior of the trimmer main body, and one rod reciprocates linearly, and the bending rigidity of the rod does not affect bead breakage at all.
図1は、チョッピング機構の配置構成を示すマンドレルの先端側トリマー部の水平外周面と片持ち支持部の説明図である。FIG. 1 is an explanatory view of the horizontal outer peripheral surface and the cantilever support portion of the distal end side trimmer portion of the mandrel, showing the arrangement configuration of the chopping mechanism. 図2は、チョッピング機構のロッドの構成を示す斜視説明図である。FIG. 2 is a perspective explanatory view showing the configuration of the rod of the chopping mechanism. 図3A、図3B、図3Cは、入力変換リンク機構の駆動源を示す説明図である。3A, 3B, and 3C are explanatory diagrams showing the drive source of the input conversion link mechanism. 図4は、実施例1のマンドレル全体を示す説明図である。FIG. 4 is an explanatory diagram showing the entire mandrel of Example 1. FIG. 図5は、実施例1のトリマー部と駆動原の縦断説明図である。FIG. 5 is a vertical sectional explanatory view of the trimmer section and the drive source of Example 1. FIG. 図6は、実施例2、3のトリマー部を示す斜視説明図である。FIG. 6 is a perspective explanatory view showing a trimmer portion of Examples 2 and 3. FIG.
トリマー部で連続チョピングを行う機構の構成を図面に基づいて説明する。 The configuration of the mechanism for performing continuous chopping in the trimmer will be described with reference to the drawings.
図1において、図破断の右側は、マンドレルの使用時には図示しない造管中の素管の上流側に位置するものであり、マンドレル1を片持ち支持するハングアーム2の下端部に固着されたマンドレル1の基端部3である。図破断の左側は素管の下流側に位置するものであり、マンドレル1の先端側のトリマー部6であり、破断で図示しない部分は基端部3に接続される延伸部4とインピーダコア部5である(図4参照)。なお、ハングアーム2は、図示しない素管開放部外のスタンドなどに支持されている。 In FIG. 1, the right side of the cutaway view is located upstream of the blank pipe during pipe making (not shown) when the mandrel is used, and the mandrel is fixed to the lower end of the hang arm 2 that supports the mandrel 1 in a cantilever manner. It is the proximal end 3 of 1. The left side of the cutaway view is located downstream of the blank pipe, and is the trimmer portion 6 on the tip side of the mandrel 1. The cutaway portion not shown is the extension portion 4 connected to the base end portion 3 and the impeder core portion. 5 (see Figure 4). The hang arm 2 is supported by a stand or the like, which is not shown, outside the open portion of the blank tube.
図2は、スカーフィング機構のビード通過孔の出口付近に配置する固定刃に対して移動刃の水平往復動でビードを寸断するチョッピング機構10の移動刃とそれを往復動させるロッド類からなるロッド往復動機構を、素管の進行方向である下流側から見た説明図である。下流側から板状の移動刃11を先端のホルダー部12で保持する一対の分割ロッド13,13は対向配置されて分割ロッド13,13の後端を接続する連結部14とで矩形枠を形成する。前記連結部14を介して接続する往復ロッド15は丸棒状であり、伝達ロッド27を介して入力変換リンク機構20(単にリンク機構20と称する)に接続される。 FIG. 2 shows rods composed of a moving blade of a chopping mechanism 10 that cuts beads by horizontal reciprocating motion of a moving blade with respect to a fixed blade arranged near the exit of a bead passage hole of the scarfing mechanism, and rods that reciprocate the moving blade. It is explanatory drawing which looked at the reciprocating mechanism from the downstream which is the advancing direction of a blank tube. A pair of split rods 13, 13 holding a plate-shaped movable blade 11 from the downstream side with a holder part 12 at the tip thereof are arranged opposite to each other and form a rectangular frame together with a connecting part 14 that connects the rear ends of the split rods 13, 13. do. The reciprocating rod 15 connected via the connecting portion 14 has a round bar shape and is connected via a transmission rod 27 to an input conversion link mechanism 20 (simply referred to as a link mechanism 20).
図2の分割ロッド13,13は、図1のトリマー部6の外周面の水平位置に設けた水平溝に外装配置され、連結部14を介して接続する一本の往復ロッド15は、トリマー部6の上流中央部を貫通し、連結されるインピーダコア部5、マンドレル延伸部4の中央部を貫通して内装され、基端部3位置で伝達ロッド27を介してリンク機構20に接続される。 The split rods 13, 13 in FIG. 2 are externally arranged in horizontal grooves provided at a horizontal position on the outer peripheral surface of the trimmer part 6 in FIG. The impeder core portion 5 and the mandrel extending portion 4 are inserted through the central portion of the upstream portion of the mandrel extending portion 4, and are connected to the link mechanism 20 via the transmission rod 27 at the base end portion 3 position. .
よって、チョッピング機構のロッド類は、トリマー部6本体に直線的に外装・内装配置されており、1本のロッドが直線的に往復動する構成であり、ロッドの曲げ剛性はビードの寸断に全く影響しない。 Therefore, the rods of the chopping mechanism are arranged linearly on the exterior and interior of the trimmer unit 6 body, and one rod reciprocates linearly. It does not affect.
リンク機構20は、同長の一対のリンク板を枢軸ピンで一つのリンク21となし、二つのリンク21を枢軸ピン22で連結して連結リンク23とし、枢軸ピン22で入カロッド26と枢着してあり、連結リンク23の上流側を固定端24とすべく、基端部3内に枢軸ピンで枢着してあり、他方の連結リンク23の下流側を摺動端25とするために、延伸部4内の貫通孔に低摩擦のカラーに保持された伝達ロッド27に枢軸ピンで枢着してある。 The link mechanism 20 is composed of a pair of link plates of the same length which are connected by pivot pins to form one link 21, two links 21 are connected by pivot pins 22 to form a connection link 23, and the pivot pins 22 are pivotally connected to an input rod 26. In order to make the upstream side of the connecting link 23 a fixed end 24, it is pivotally attached to the base end portion 3 with a pivot pin, and to make the downstream side of the other connecting link 23 a sliding end 25. , is pivotally attached by a pivot pin to a transmission rod 27 held in a low-friction collar in a through hole in extension 4 .
図1では、ハングアーム2内に駆動源30として油圧シリンダ31を内蔵してシリンダロッド32に入カロッド26と接続されて、連結リンク23は引き上げられて屈曲した状態である。 In FIG. 1, a hydraulic cylinder 31 is built in the hang arm 2 as a drive source 30, the input rod 26 is connected to the cylinder rod 32, and the connecting link 23 is pulled up and bent.
油圧シリンダ31が入力ロッド26を押し下げて連結リンク23が直線化した際、摺動端25は伝達ロッド27を強く押すことができ、チョッピング機構10の先端の移動刃11を下流側へ水平移動させることができる。さらに、油圧シリンダ31が入力ロッド26を押し下げて連結リンク23が屈曲化した際、移動刃11を上流側へ戻すことができる。 When the hydraulic cylinder 31 pushes down the input rod 26 and the connecting link 23 is straightened, the sliding end 25 can strongly push the transmission rod 27, causing the moving blade 11 at the tip of the chopping mechanism 10 to horizontally move downstream. be able to. Furthermore, when the hydraulic cylinder 31 pushes down the input rod 26 and the connecting link 23 is bent, the moving blade 11 can be returned upstream.
この時、油圧シリンダ31は下降ストロークエンドで、次いで上昇ストロークに入ると、連結リンク23は屈曲化から直線化して再度、最も強く移動刃11を下流側へ水平移動させることができ、さらに、油圧シリンダ31が入力ロッド26を引き上げて連結リンク23が屈曲化した際、移動刃11を上流側へ戻すことができ、上昇ストロークエンドとなる。 At this time, when the hydraulic cylinder 31 is at the end of the downward stroke and then enters the upward stroke, the connecting link 23 is straightened from being bent and again can move the moving blade 11 horizontally to the downstream side most strongly. When the cylinder 31 pulls up the input rod 26 and the connecting link 23 is bent, the movable blade 11 can be returned to the upstream side, and the rising stroke end is reached.
リンク機構20は、油圧シリンダ31の下降上昇の1ストロークで、往復ロッド15を2往復させることができ、連結リンク23の直線化の際に最も強く往復ロッド15を押すことができ、ビードの切断力が増す効果が得られる。 The link mechanism 20 can reciprocate the reciprocating rod 15 twice in one stroke of lowering and ascending of the hydraulic cylinder 31, and can push the reciprocating rod 15 most strongly when the connecting link 23 is straightened, cutting the bead. You get the effect of increasing your strength.
駆動源には、直線動の油圧シリンダのほか、回転動を利用することができ、図3に示すように回転軸33の端面の外周部に入カロッド26を枢着し、回転軸33が図示しない電動あるいは流体圧モータで回転すると、回転動が直線動に変換されて、回転軸33の一回転で、上述したように連結リンク23の屈曲、直線化が2回ずつ発生し、往復ロッド15は2往復する。また、図3の回転軸33に替えて、回転クランク機構を採用することもできる。 As a drive source, a linear motion hydraulic cylinder as well as a rotary motion can be used. As shown in FIG. When the rotating shaft 33 rotates by an electric or fluid pressure motor, the rotary motion is converted into a linear motion. makes two round trips. Also, a rotating crank mechanism can be employed instead of the rotating shaft 33 of FIG.
上述の構成のチョッピング機構は、駆動源からの垂直動が水平動に変換されるリンク機構によるワンウエイ方式のチョッピングであり、駆動源は流体圧シリンダや回転モータのみで、何ら複雑、高精度の制御を必要としない。
さらに、チョッピングのタイミングを制御するには、リンク機構の入力ロッドと回転モータとの間に、間欠回転運動機構や間欠往復運動機構などの機械機構を適宜採用することで、所望する間欠運動として、往復ロッドを往復させることができ、機械機構を介在させるのみで、高精度の制御を必要としない。 The chopping mechanism of the above configuration is one-way chopping by a link mechanism that converts vertical motion from the drive source into horizontal motion. does not require
Furthermore, in order to control the timing of chopping, by appropriately adopting a mechanical mechanism such as an intermittent rotary motion mechanism or an intermittent reciprocating motion mechanism between the input rod of the link mechanism and the rotary motor, the desired intermittent motion is The reciprocating rod can be reciprocated, and only a mechanical mechanism is intervened, and high-precision control is not required.
図1において、トリマー部6に必須のバイト、上ローラ、下ローラの詳細(実施例2の図6と同様構成)に説明していないが、一本の金属棒状のトリマー部6の上面中央部にバイトホルダー溝や上ローラ収納孔や溝を設け、トリマー部6の下面中央に下ローラの収納穴を設けるなど、バイト、上ローラ、下ローラを適宜配設しても、チョッピング機構10の分割ロッド13はトリマー部6の外周面の水平位置に設けた水平溝に配置される構成である。 In FIG. 1, details of the cutting tool, the upper roller, and the lower roller that are essential to the trimmer portion 6 (the same configuration as in FIG. 6 of Embodiment 2) are not described, but the central portion of the upper surface of the single metal bar-shaped trimmer portion 6 The chopping mechanism 10 can be divided even if the cutting tool, the upper roller, and the lower roller are appropriately arranged, such as by providing a cutting tool holder groove, an upper roller storage hole, and a groove in the bottom surface of the trimmer part 6, and providing a storage hole for the lower roller in the center of the lower surface of the trimmer part 6. The rod 13 is arranged in a horizontal groove provided at a horizontal position on the outer peripheral surface of the trimmer portion 6 .
よって、このチョッピング機構は、トリマー部6に外装される分割ロッド13の先端ホルダー部12が、トリマー部6の先端部のバイトで切削されたビードの通過孔近傍に配置する固定刃の下面側を水平動できるように配置するのみで、寸断の機能を発揮できるため、トリマー部6に必須のバイト、上ローラ、下ローラの配置に一切妨げにならない、簡素な構成である。 Therefore, in this chopping mechanism, the tip holder part 12 of the split rod 13 attached to the trimmer part 6 is positioned near the passage hole of the bead cut by the cutting tool at the tip part of the trimmer part 6. Since the chopping function can be exhibited only by arranging so that it can move horizontally, it is a simple structure that does not hinder the arrangement of the cutting tool, upper roller, and lower roller that are essential for the trimmer section 6 at all.
なお、図面には、チョッピング機構の駆動源がハングアーム内にある構成を示しているが、鋼管の製品寸法が大きい場合、例えばコンパクトな回転モータをマンドレルの基端部上面部に載置したり、前記マンドレル基端部上部からオフラインに引き出して配置したり、することもできる。かかるオフラインでは、回転モータに替えてラック&ピニオンを用いて油圧シリンダの直線運動を回転運動に変換する機構を採用したり、油圧シリンダでレバーを回転させる機構を採用したり、種々の機械運動機構を適宜介在させることにより、種々の動力源を利用できる。 The drawing shows a configuration in which the driving source of the chopping mechanism is in the hang arm. , can be pulled out and placed off-line from above the mandrel proximal end. In such off-line, various mechanical motion mechanisms such as a mechanism that converts the linear motion of a hydraulic cylinder into a rotary motion using a rack and pinion instead of a rotary motor, a mechanism that rotates a lever with a hydraulic cylinder, etc. Various power sources can be utilized by appropriately interposing the .
実施例1
造管する溶接鋼管の製品寸法は、外径50mm、最大肉厚4mm、最小内径42mmである。使用する内面ビード処理装置は、ビードの切削にネイルバイトを使用するものでトリマー部の外径は32mmである。図4と図5に基づいて説明する。図の右側が造管の上流側、左側側が下流側である。また、造管中の素管との位置関係を示すために、素管の断面を図示するが、装置の寸法比とは一致しないイメージを示す。 Example 1
The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 50 mm, a maximum wall thickness of 4 mm, and a minimum inner diameter of 42 mm. The internal bead processing equipment used uses a nail bit to cut the bead, and the outer diameter of the trimmer part is 32 mm. Description will be made based on FIGS. 4 and 5. FIG. The right side of the figure is the upstream side of pipe making, and the left side is the downstream side. Also, in order to show the positional relationship with the blank pipe being manufactured, the cross section of the blank pipe is illustrated, but the image shown does not match the dimensional ratio of the apparatus.
マンドレル1は、上流側からハングアーム2と接続される基端部3、次いで延伸部4とインピーダコア部5、先端側のトリマー部6から構成される。インピーダコア部5の上流側上面に突出するのは樹脂チューブ7であり、ハングアーム2から延伸部4内の配管を通してインピーダコア部5先端まで供給された冷却水は同部を上流側に戻り、開口している素管外に噴出させることができる。造管の際にはインピーコア部5の先端位置にスクイズロールの溶接ポイントが位置する。 The mandrel 1 is composed of a base end portion 3 connected to a hang arm 2 from the upstream side, an extension portion 4, an impeder core portion 5, and a trimmer portion 6 on the tip side. A resin tube 7 protrudes from the upper surface of the impeder core portion 5 on the upstream side, and the cooling water supplied from the hang arm 2 to the tip of the impeder core portion 5 through the piping in the extension portion 4 returns to the upstream side of the same portion, It can be ejected to the outside of the open base pipe. The welding point of the squeeze roll is positioned at the tip position of the impy core portion 5 during pipe making.
トリマー部6には、図5に示すように先端上面にネイルバイト51を止着するためのバイトホルダー50が固着されてビード通過孔52を形成しており、ネイルバイト51の傾斜面先端には超硬チップがロウ付けで固着されている。その下流側直後の穴部に上ローラ40が軸支されており、上ローラ40の軸支位置より上流側位置に軸支するL型のローラホルダー43に下ローラ42が保持されてトリマー部6下面側に収納され、ローラホルダー43の屈曲部に接続するプルロッド44を引くことで下ローラ42が下降し、素管内面に当接してネイルバイト51に押圧力を作用させる。下ローラ42のさらに上流側の上面に第二の上ローラ41が配置される。 As shown in FIG. 5, the trimmer portion 6 has a bead passing hole 52 formed by fixing a tool holder 50 for fixing a nail bit 51 on the upper surface of the tip. Carbide tip is fixed by brazing. An upper roller 40 is pivotally supported in a hole immediately downstream of the upper roller 40, and the lower roller 42 is held by an L-shaped roller holder 43 that is pivotally supported at a position upstream of the upper roller 40. By pulling a pull rod 44 that is housed on the lower surface side and connected to the bent portion of the roller holder 43, the lower roller 42 descends and abuts against the inner surface of the blank tube to apply a pressing force to the nail bite 51. A second upper roller 41 is arranged on the upper surface of the lower roller 42 further upstream.
前記プルロッド44は、マンドレル1の下面部の全長に渡り配置されて基端部3で、枢着されるレバー45の下端に接続され、ホルダーアーム2内に垂直に内蔵される油圧シリンダ34の下降したシリンダロッドにレバー45の上端に枢軸されたロッドが接続されて、油圧シリンダ34のシリンダロッドの上昇工程でプルロッド44が上流側に引かれて下ローラ42が下降する。逆に油圧をヘッド側にかけると下ローラ42が収納される。 The pull rod 44 is arranged over the entire length of the lower surface of the mandrel 1 and is connected to the lower end of a pivoted lever 45 at the base end 3 to lower the hydraulic cylinder 34 vertically built in the holder arm 2. A rod pivoted to the upper end of the lever 45 is connected to the cylinder rod thus pulled, and the pull rod 44 is pulled upstream in the upward stroke of the cylinder rod of the hydraulic cylinder 34 to lower the lower roller 42 . Conversely, when hydraulic pressure is applied to the head side, the lower roller 42 is retracted.
トリマー部6先端部の下面側にはビード通過孔52出口付近に固定刃53が止着されている。チョッピング機構の先端部のホルダー部12に保持される移動刃11の上面がビード通過孔
52出口の固定刃53の下面側を水平動する。そのためにホルダー部12はトリマー部6の側
面中央部の水平溝内を水平に摺動する分割ロッドに保持され、連結部14を介して往復ロッド15に接続され、基端部3でリンク機構20の伝達ロッド27に連結されている。チョッピング機構の動力源30にはアーム2内に垂直に内蔵される油圧シリンダ31を用いた。 A fixed blade 53 is attached near the exit of the bead passage hole 52 on the lower surface side of the tip of the trimmer portion 6 . The upper surface of the movable blade 11 held by the holder portion 12 at the tip of the chopping mechanism serves as a bead passage hole.
The bottom side of the fixed blade 53 at the exit 52 is moved horizontally. For this purpose, the holder part 12 is held by a split rod that horizontally slides in a horizontal groove in the center of the side surface of the trimmer part 6, is connected to a reciprocating rod 15 via a connecting part 14, and is connected to a link mechanism 20 at the base end part 3. is connected to the transmission rod 27 of the A hydraulic cylinder 31 vertically built in the arm 2 is used as the power source 30 of the chopping mechanism.
上述の構成からなるトリマー部6は、ネイルバイト51、上ローラ40,41、下ローラ42を所要配置し、さらにチョッピング機構を外装、内装配置することができ、その外径は32mmとすることができた。 The trimmer unit 6 configured as described above has the nail bit 51, the upper rollers 40, 41, and the lower roller 42 arranged as required, and furthermore, the chopping mechanism can be arranged externally or internally, and its outer diameter can be 32 mm. did it.
従って、このトリマー部6は、製品予定最小内径が42mmの素管内に十分な間隔を保持して下ローラ42を素管外の油圧シリンダ34で下降させることができ、それ故ネイルバイ51に必要な切削荷重を負荷させて切削したビードを、チョッピング機構は移動刃のストローク11mmを往復0.05秒で連続チョッピングすることができた。 Therefore, the trimmer section 6 can maintain a sufficient space inside the blank tube with a planned minimum inner diameter of 42 mm, and the lower roller 42 can be lowered by the hydraulic cylinder 34 outside the blank tube. The chopping mechanism was able to continuously chop the bead cut by applying a cutting load in 0.05 seconds reciprocating with a stroke of 11 mm of the moving blade.
実施例2
造管する溶接鋼管の製品寸法は、外径60.3mm、最大肉厚5mm、最小内径50.3mmである。使用するマンドレルは実施例1と相似形で拡大するも同様構成であり、内面ビードの切削にリングバイトを使用するものでトリマー部の外径は40mmである。図6に基づいて説明する。 Example 2
The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 60.3 mm, a maximum wall thickness of 5 mm, and a minimum inner diameter of 50.3 mm. The mandrel to be used has a configuration similar to that of Example 1, although enlarged, and a ring bit is used for cutting the inner surface bead, and the outer diameter of the trimmer portion is 40 mm. Description will be made based on FIG.
トリマー部6の本体先端側に上面より傾斜配置したビード通過孔52にリングバイト54を止着し、ビード通過孔出口付近に下面側より固定刃を止着してある。ビード通過孔52のリングバイト54に近接する上流側の下面より下ロール46が昇降可能となるように、屈曲のローラアーム47を枢軸配置してアーム後端にプッシュロッド48を接続し、トリマー部6本体内に内蔵する油圧シリンダにて下ローラ46を下降させてリングバイト54に所要の荷重を負荷できる。 A ring bit 54 is attached to the bead passage hole 52 which is inclined from the upper surface of the trimmer portion 6 on the tip side of the main body, and a fixed blade is attached from the lower surface side near the exit of the bead passage hole. A bent roller arm 47 is pivotally arranged so that the lower roll 46 can be raised and lowered from the lower surface of the bead passage hole 52 on the upstream side close to the ring bite 54, and a push rod 48 is connected to the rear end of the arm, and the trimmer portion 6 A required load can be applied to the ring bite 54 by lowering the lower roller 46 with a hydraulic cylinder built in the main body.
ここでは、リングバイト54の下方側近くに下ローラ46を配置し、上ロール49は相対的に上流側に離してピンで軸支配置してある。また、チョッピング機構は先に図1と図2に基づいて説明した構成そのものである。 Here, the lower roller 46 is arranged near the lower side of the ring bite 54, and the upper roll 49 is relatively spaced upstream and pivotally supported by a pin. Also, the chopping mechanism has the same configuration as described with reference to FIGS. 1 and 2 above.
上述の構成からなるトリマー部6は、リングバイト54、上ローラ49を所要配置し、下ローラ46と駆動源の油圧シリンダを内蔵配置し、さらにチョッピング機構10を外装、内装配置することができ、その外径は40mmとすることができた。 The trimmer unit 6 configured as described above has the ring bite 54 and the upper roller 49 arranged as required, the lower roller 46 and the hydraulic cylinder of the driving source are arranged inside, and the chopping mechanism 10 can be arranged externally or internally. Its outer diameter could be 40 mm.
従って、製品予定内径が50.3mmの素管内に十分な間隔を保持して下ローラ46を内蔵する油圧シリンダで下降させることができ、リングバイト51に必要な切削荷重を負荷させて切削したビードを、チョッピング機構は移動刃のストローク13mmを往復0.054秒で連続チョッピングすることができた。 Therefore, it can be lowered by a hydraulic cylinder with a built-in lower roller 46 while keeping a sufficient distance in the blank pipe with a planned product inner diameter of 50.3 mm, and the cut bead is cut by applying the necessary cutting load to the ring bit 51. , The chopping mechanism was able to chop continuously with a moving blade stroke of 13 mm in 0.054 seconds.
また、移動刃を交換することによりチョッピングからニッキングに変更できた。 In addition, chopping can be changed to nicking by exchanging the movable blade.
さらに、ビード通過孔52とリングバイト54は同位置でトリマー部6の先端に位置しており、ビードの通過の妨げになる部分が少なく、ビード詰まりが発生し難い。 Further, the bead passage hole 52 and the ring bite 54 are located at the same position at the tip of the trimmer portion 6, so there are few parts that hinder the passage of the bead, and bead clogging is less likely to occur.
実施例3
造管する溶接鋼管の製品寸法は、外径73mm、最大肉厚7mm、最小内径59mmである。使用するマンドレルは実施例2と相似形で拡大するも同様構成であり、内面ビードの切削にリングバイトを使用するものでトリマー部の外径は48mmである。 Example 3
The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 73 mm, a maximum wall thickness of 7 mm, and a minimum inner diameter of 59 mm. The mandrel to be used has the same configuration as that of Example 2, although it is enlarged, and a ring bit is used for cutting the inner surface bead, and the outer diameter of the trimmer portion is 48 mm.
実施例2と同様に下ロールの昇降はレバー押圧ロッドを用い、駆動源に油圧シリンダを水平に内蔵した。チョッピング機構の駆動源には、回転軸式を採用し電動モータで回転させた。 As in Example 2, the lower roll was moved up and down using a lever pressing rod, and a hydraulic cylinder was horizontally built in as a drive source. The driving source of the chopping mechanism is a rotating shaft type and is rotated by an electric motor.
製品予定内径が59mmの素管内に十分な間隔を保持して下ローラを内蔵する油圧シリンダで下降させることができ、リングバイトに必要な切削荷重を負荷させて切削したビードを、チョッピング機構は駆動源にコンパクト化が可能な回転型を用いて極めて滑らかに、移動刃のストローク16mmを往復0.1秒で連続チョッピングすることができた。 It can be lowered by a hydraulic cylinder with a built-in lower roller while keeping a sufficient distance in the blank tube with a planned product inner diameter of 59 mm, and the bead cut by applying the necessary cutting load to the ring bit is driven by the chopping mechanism. Using a compact rotary type source, we were able to achieve extremely smooth continuous chopping with a moving blade stroke of 16 mm in 0.1 second reciprocation.
また、スクイズポイントからリングバイトの距離を540mm程度に短くでき、ビードの切削抵抗が小さく、低負荷のスカーフィング、チョッピングが可能になった。 In addition, the distance from the squeeze point to the ring bite can be shortened to about 540mm, and the cutting resistance of the bead is small, enabling low-load scarfing and chopping.
実施例4
造管する溶接鋼管の製品寸法は、外径89.1mm、最大肉厚8mm、最小内径73.1mmである。マンドレルには実施例3と同様構成のものを用い、下ローラは外径を大きくした物と交換した。 Example 4
The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 89.1 mm, a maximum wall thickness of 8 mm, and a minimum inner diameter of 73.1 mm. A mandrel having the same structure as in Example 3 was used, and the lower roller was replaced with one having a larger outer diameter.
製品予定内径が73.1mmの素管内に十分な間隔を保持して下ローラを内蔵する油圧シリンダで下降させることができ、リングバイトに必要な切削荷重を負荷させて切削したビードを、チョッピング機構は移動刃のストローク16mmを往復0.1秒で連続チョッピングすることができた。 It can be lowered by a hydraulic cylinder with a built-in lower roller while keeping a sufficient distance in the blank tube with a planned product inner diameter of 73.1 mm, and the bead cut by applying the necessary cutting load to the ring bit is cut by the chopping mechanism. Continuous chopping was possible with a moving blade stroke of 16 mm in 0.1 seconds.
また、スクイズポイントからリングバイトの距離を540mm程度に短くでき、ビードの切削抵抗が小さく、低負荷のスカーフィング、チョッピングが可能になった。 In addition, the distance from the squeeze point to the ring bite can be shortened to about 540mm, and the cutting resistance of the bead is small, enabling low-load scarfing and chopping.
実施例5
造管する溶接鋼管の製品寸法は、外径114.3mm、最大肉厚10mm、最小内径94.3mmである。使用するマンドレルは実施例3,4と相似形で拡大するも同様構成であり、内面ビードの切削にリングバイトを使用するものでトリマー部の外径は83mmである。 Example 5
The product dimensions of the welded steel pipe to be manufactured are an outer diameter of 114.3 mm, a maximum wall thickness of 10 mm, and a minimum inner diameter of 94.3 mm. The mandrel to be used has the same structure as that of Examples 3 and 4, although enlarged, and a ring bit is used for cutting the inner bead, and the outer diameter of the trimmer portion is 83 mm.
製品予定内径が94.3mmの素管内に十分な間隔を保持して下ローラを内蔵する油圧シリンダで下降させることができ、リングバイトに必要な切削荷重を負荷させて切削したビードを、チョッピング機構は移動刃のストローク22mmを往復0.1秒で連続チョッピングすることができた。 It can be lowered by a hydraulic cylinder with a built-in lower roller while keeping a sufficient distance in the blank tube with a planned inner diameter of 94.3 mm, and the bead cut by applying the necessary cutting load to the ring bit is cut by the chopping mechanism. Continuous chopping was possible with a moving blade stroke of 22mm in 0.1 seconds.
また、スクイズポイントからリングバイトの距離を660mm程度に短くでき、ビードの切削抵抗が小さく、低負荷のスカーフィング、チョッピングが可能になった。 In addition, the distance from the squeeze point to the ring bite can be shortened to about 660mm, and the cutting resistance of the bead is small, enabling low-load scarfing and chopping.
溶接鋼管の製造に際し、従来は内面ビード処理装置ではスカーフィングのみで、管内に長尺のビードが残存して操業の安全性が懸念される小径厚肉管の造管で、マンドレルにチョッピング機構を内蔵させることが可能になった。 When manufacturing welded steel pipes, conventional inner bead processing equipment only scarfed, leaving a long bead inside the pipe, which is a concern for operational safety. It is now possible to incorporate it.
チョッピング機構に簡素な構成が採用できたため、スクイズポイントからリングバイトの距離を短くでき、ビードの切削抵抗が小さく、低負荷のスカーフィング、チョッピングが可能になった。 Since the simple structure of the chopping mechanism can be adopted, the distance from the squeeze point to the ring bite can be shortened, the cutting resistance of the bead is small, and low-load scarfing and chopping are possible.
1マンドレル
2ハングアーム
3基端部
4延伸部
5インピーダコア部
6トリマー部
7樹脂チューブ
10チョッピング機構
11移動刃
12ホルダー部
13分割ロッド
14連結部
15往復ロッド
20リンク機構
21リンク
22枢軸ピン
23連結リンク
24固定端
25摺動端
26入力ロッド
27伝達ロッド
30駆動源
31油圧シリンダ
32シリンダロッド
33回転軸
34油圧シリンダ
40,41,49上ローラ
42,46下ローラ
43ローラホルダー
44プルロッド
45レバー
47ローラアーム
48プッシュロッド
50バイトホルダー
51ネイルバイト
52ビード通過孔
53固定刃
54リングバイト
 
  1 mandrel
2 hang arms
3 proximal end
4 extension
5 impeder core
6 trimmer
7 resin tube
10 chopping mechanism
11 moving blade
12 holder part
13 split rod
14 connection
15 reciprocating rods
20 link mechanism
21 links
22 pivot pin
23 connecting links
24 fixed ends
25 sliding end
26 input rods
27 transmission rod
30 drive source
31 hydraulic cylinder
32 cylinder rod
33 rotation axis
34 hydraulic cylinders
40,41,49 upper roller
42,46 lower roller
43 roller holder
44 pull rod
45 lever
47 roller arm
48 push rod
50 bytes holder
51 nail bite
52 bead passage hole
53 fixed blade
54 ring bite

Claims (5)

  1. 造管中に溶接鋼管の管内面に生成するビードを切削するスカーフィング機構と、連続的にスカーフィング処理した後の条状ビードを所要長さで寸断処理するためのチョッピング機構とを備え、スクイズロールスタンドの上流側の素管開放部より同スタンドの下流側の素管内に挿入されるマンドレルに装着される溶接鋼管の内面ビード処理装置において、
    前記チョッピング機構は、前記マンドレルの先端側に設けた前記スカーフィング機構のビード通過孔の出口付近に配置する固定刃と、前記マンドレルに水平動可能に装着されて往復動する一対の分割ロッドの先端に設けた移動刃とで、切削後の内面ビードを寸断する構成を有し、
    前記チョッピング機構における前記分割ロッドの往復動駆動には、同長または異長の二つのリンクを連結した連結リンクの一方端を固定端とするため前記マンドレルに枢着し、前記連結リンクの他方端を、前記マンドレル内で摺動端として直線動を伝達する伝達ロッドに接続し、前記連結リンクの連結点に駆動源からの入力ロッドを枢着し、前記連結リンクが前記入力ロッドにより直線化、屈曲化する運動にて前記伝達ロッドが直線動する構成の入力変換リンク機構が、前記マンドレルの後端側に位置して用いられ、
    前記伝達ロッドには、前記分割ロッドの後端に接続して前記マンドレルに水平動可能に装着される往復ロッドが接続されることを特徴とする溶接鋼管の内面ビード処理装置。     Equipped with a scarfing mechanism for cutting the beads generated on the inner surface of the welded steel pipe during pipemaking, and a chopping mechanism for chopping the streak beads after continuous scarfing to a required length. In an apparatus for treating the inner surface bead of a welded steel pipe attached to a mandrel inserted into a blank pipe on the downstream side of a roll stand from an opening portion of the blank pipe on the upstream side of the roll stand,
    The chopping mechanism includes a fixed blade disposed near the exit of the bead passage hole of the scarfing mechanism provided on the tip side of the mandrel, and tips of a pair of split rods horizontally movably mounted on the mandrel and reciprocating. With a moving blade provided in, it has a configuration that shreds the inner surface bead after cutting,
    For the reciprocating drive of the split rod in the chopping mechanism, one end of a connection link connecting two links of the same length or different lengths is pivotally attached to the mandrel so as to be a fixed end, and the other end of the connection link is fixed. is connected to a transmission rod that transmits linear motion as a sliding end within the mandrel, an input rod from a drive source is pivotally attached to the connection point of the connection link, and the connection link is linearized by the input rod, An input conversion link mechanism having a configuration in which the transmission rod moves linearly with bending motion is positioned on the rear end side of the mandrel and used,
    An inner bead treatment apparatus for welded steel pipes, wherein the transfer rod is connected to a reciprocating rod which is connected to the rear ends of the split rods and is horizontally movably mounted on the mandrel.
  2. 請求項1に記載の溶接鋼管の内面ビード処理装置において、
    前記チョッピング機構における前記駆動源がマンドレル後端側のマンドレル支持部にある、溶接鋼管の内面ビード処理装置。     In the inner bead processing apparatus for welded steel pipes according to claim 1,
    An inner surface bead processing apparatus for welded steel pipes, wherein the drive source of the chopping mechanism is located at a mandrel support portion on the rear end side of the mandrel.
  3. 請求項1に記載の溶接鋼管の内面ビード処理装置において、
    前記チョッピング機構における前記駆動源が流体圧シリンダである、溶接鋼管の内面ビード処理装置。     In the inner bead processing apparatus for welded steel pipes according to claim 1,
    An apparatus for processing an inner surface bead of a welded steel pipe, wherein the drive source in the chopping mechanism is a fluid pressure cylinder.
  4. 請求項1に記載の溶接鋼管の内面ビード処理装置において、
    前記チョッピング機構における前記駆動源が回転モータである、溶接鋼管の内面ビード処理装置。     In the inner bead processing apparatus for welded steel pipes according to claim 1,
    An apparatus for processing an inner surface bead of a welded steel pipe, wherein the drive source in the chopping mechanism is a rotary motor.
  5. 請求項1に記載の溶接鋼管の内面ビード処理装置において、
    前記移動刃がニッキング用である、溶接鋼管の内面ビード処理装置。
     
     
          In the inner bead processing apparatus for welded steel pipes according to claim 1,
    An inner bead processing apparatus for a welded steel pipe, wherein the movable blade is for nicking.
PCT/JP2022/040951 2021-12-27 2022-11-02 Internal bead processing device WO2023127301A1 (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5083886A (en) * 1973-11-29 1975-07-07
JPS5393530U (en) * 1976-12-28 1978-07-31
JPS6185310U (en) * 1984-11-09 1986-06-05
JPS63154113U (en) * 1987-03-30 1988-10-11
JPH04300115A (en) * 1991-03-27 1992-10-23 Nkk Corp Cutting device for bead on internal surface of seam welded pipe
JPH09103910A (en) * 1995-10-06 1997-04-22 Mitsubishi Heavy Ind Ltd Inner bead trimmer of electric resistance welded tube
JPH10193284A (en) * 1996-12-27 1998-07-28 Puropurai:Kk Inner surface bead cutting and subdividing device for electro resistance welded tube
JPH1133814A (en) * 1997-07-22 1999-02-09 Nkk Corp Internal surface beads cutting device for electric resistance welded tube
JP2001105184A (en) * 1999-10-12 2001-04-17 Puropurai:Kk Bead treatment device of resistance welded tube inner face

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5083886A (en) * 1973-11-29 1975-07-07
JPS5393530U (en) * 1976-12-28 1978-07-31
JPS6185310U (en) * 1984-11-09 1986-06-05
JPS63154113U (en) * 1987-03-30 1988-10-11
JPH04300115A (en) * 1991-03-27 1992-10-23 Nkk Corp Cutting device for bead on internal surface of seam welded pipe
JPH09103910A (en) * 1995-10-06 1997-04-22 Mitsubishi Heavy Ind Ltd Inner bead trimmer of electric resistance welded tube
JPH10193284A (en) * 1996-12-27 1998-07-28 Puropurai:Kk Inner surface bead cutting and subdividing device for electro resistance welded tube
JPH1133814A (en) * 1997-07-22 1999-02-09 Nkk Corp Internal surface beads cutting device for electric resistance welded tube
JP2001105184A (en) * 1999-10-12 2001-04-17 Puropurai:Kk Bead treatment device of resistance welded tube inner face

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