JP2019209427A - Processing device for edge face of steel pipe - Google Patents

Abstract

To provide a processing device capable of preventing excess grinding of a steel pipe edge face and capable of achieving stabilization of a product quality by automation and mass productivity.SOLUTION: A processing device 10 for steel pipe edge face comprises: a fixing mechanism 12 fixing one end side of a steel pipe 11; a grinder 13 grinding the edge face of the other end side of the steel pipe 11; and a grinder support mechanism 14 supporting the disc 13A of the grinder 13 at a position capable of grinding facing the edge face. A grinding process is carried out in such a manner that the disc 13A beats repeatedly the edge face using an amplitude operation of the disc 13A at rotation from a non-contact position at which the disc 13A does not usually contact the edge face.SELECTED DRAWING: Figure 1

Description

  The present invention is a steel pipe end face processing apparatus for flattening the joint surface of the flange part of the steel pipe end part, and in particular, by performing the flat processing using the amplitude operation of the blade of the grinder, it is possible to stabilize mass productivity and quality. The present invention relates to a steel pipe end face processing apparatus that realizes the performance.

  Steel pipes are used as pipes for transporting fluids. In plant equipment such as frozen food processing plants and refrigerated food processing factories, fluid pipes such as drain pipes and gas pipes are formed by connecting a plurality of steel pipes. . And in patent document 1, the structure which connects steel pipes using a loose flange in the connection part of the steel pipes of the said fluid piping is disclosed. 6 (A) and 6 (B) are perspective views illustrating a method for connecting steel pipes.

  FIG. 6A shows a state in which the straight steel pipe 100 and the curved steel pipe 101 are connected using the loose flanges 103 and 104 at the corner portion of the fluid conduit. And the flange part 105 by the flare process is formed in the edge part of the steel pipe 100, and the flange part 106 is similarly formed in the edge part of the steel pipe 101. FIG.

  FIG. 6B shows a state where the steel pipes 100 and 101 shown in FIG. A packing 107 is sandwiched between the joint surfaces of the flange portions 105 and 106, and the packing 107 is sandwiched between the loose flanges 103 and 104, and the loose flanges 103 and 104 are bolted. With this structure, the water stopping property of the fluid flowing through the fluid piping is maintained at the connection portion of the steel pipes 100 and 101.

Japanese Patent No. 4213721

  As shown in FIG. 6 (B), in the fluid piping, with the packing 107 sandwiched between the joint surfaces of the flange portions 105 and 106, the fluid piping is securely tightened by the loose flanges 103 and 104. Realizes water.

  However, when the uneven shape is formed by plating peeling of the joint surfaces of the flange portions 105 and 106, or when the uneven shape of the electric stitching portion is formed on the joint surfaces of the flange portions 105 and 106, the flatness of the joint surface Is not maintained, there is a problem that even when the packing 107 is sandwiched between the joint surfaces, the fluid is likely to leak from the formation region of the concavo-convex shape, and it is difficult to achieve a desired water stoppage.

  In order to solve the water-stop problem, it is necessary to flatten the joint surfaces of the flange portions 105 and 106 to remove the uneven shape. And it is possible to use NC lathe machine for the said flat work from a viewpoint of mass-productivity and quality stability. However, since the straight steel pipe 100 is particularly long, the steel pipe 100 cannot be stored in the processing room, and there is a problem that it is difficult to use a general-purpose NC lathe. In addition, in order to flatten the joint surface of the steel pipe 100, it is conceivable to specially order an NC lathe machine, but the equipment cost increases, the profitability is not suitable, and it is not a practical countermeasure.

  On the other hand, in order to solve the problem of the above-mentioned custom-made NC lathe machine, the length of the steel pipe 101 is stored in the machining room of the NC lathe machine, for example, the steel pipe 101 disposed at the corner of the fluid piping. It is possible to make it as long as possible. In this case, mass-productivity and quality stability can be realized by a mechanical polishing process, but the number of fluid piping connections increases, workability on site and material cost deteriorate, and a realistic countermeasure is not.

  As a result, in order to solve the water-stopping problem while maintaining the length of the steel pipe 100, it is conceivable that an operator performs a flat process on the joint surface of the steel pipe 100 using a grinder. . However, since the grinder is used while pressing the blade of the grinder against the joint surface, there is a problem that it is difficult to achieve stabilization of product quality due to the proficiency level of the operator. For example, the flatness of the joint surface could be realized, but by cutting the flange portion 105 too much, the flange portion 105 becomes thin, durability cannot be maintained, and the flange portion 105 may be damaged during construction or use. is there. There is also a problem that it is difficult to secure skilled workers due to the shortage of human resources due to the recent aging society.

  The present invention has been made in view of the above circumstances, and is capable of mass production by mechanically flattening the joint surface of the flange portion at the end of the steel pipe using the amplitude operation of the blade of the grinder. And an end face processing apparatus for steel pipe that realizes stability of quality.

  In the steel pipe end face processing apparatus of the present invention, a fixing mechanism for fixing one end of the steel pipe, a grinder for grinding the end face on the other end of the steel pipe, and a disk of the grinder at a position capable of grinding with respect to the end face. A grinder support mechanism for supporting the disk and the end face by an amplitude operation of the disk from a non-contact position where the disk and the end face do not always contact when the disk rotates. The grinder is supported so as to repeat the contact state and the non-contact state.

  In the steel pipe end face processing apparatus of the present invention, the end face is a joint surface of a flange portion formed by flaring the steel pipe, and the grinder support mechanism has a region facing the joint surface. The disk is disposed at the non-contact position, and the disk is arranged in such a manner that the outer peripheral end side of the disk is inclined so as to approach the joint surface side from a position parallel to the joint surface in the facing region. It is characterized by providing.

  The steel pipe end surface processing apparatus of the present invention further includes an origin detection contact sensor for measuring a separation distance between the disk and the end surface at the non-contact position, and the grinder support when the disk rotates. The mechanism is characterized in that the grinder is intermittently moved to the end face side, and the movement of the grinder is stopped according to a measurement value of the origin detection contact sensor.

  The steel pipe end surface processing apparatus of the present invention further includes a fixing jig used when the fixing mechanism fixes the steel pipe, and is fixed to one end side of the fixing jig by the fixing mechanism. And a fixing flange portion to which the flange portion of the steel pipe is fixed is provided on the other end side of the fixing jig, and the fixing jig has a loose flange. And

  In the steel pipe end face processing apparatus of the present invention, the fixing mechanism rotates the steel pipe around the axis of the steel pipe while moving the steel pipe, and moves the contact area between the disk and the end face. It is characterized by that.

  Further, in the steel pipe end surface processing apparatus of the present invention, the grinder support mechanism moves the grinder along the end surface with respect to the steel pipe fixed to the fixing mechanism, so that a contact area between the disk and the end surface It is characterized by moving.

  In the steel pipe end face processing apparatus of the present invention, a fixing mechanism for fixing one end side of the steel pipe, a grinder for grinding the end face on the other end side of the steel pipe, and a grinder for supporting the disc of the grinder at a position capable of grinding with respect to the end face. And a support mechanism. Then, the end surface of the disc is ground from a non-contact position where the disc and the end surface do not always contact each other by using an amplitude operation during the rotation of the disc. With this structure, the disc is ground so that the end surface is repeatedly hit, so that the end surface is prevented from being excessively ground and product quality can be stabilized and mass productivity can be realized by automation.

  Further, in the steel pipe end surface processing apparatus of the present invention, the end surface is a joint surface of the flanged flange portion of the steel pipe, and the outer peripheral end side of the disk is parallel to the joint surface in the facing region between the joint surface and the disk. The disk is inclined and arranged so as to approach the joint surface side from the position. With this structure, the contact area between the disk and the joint surface can be increased, and the efficiency of the grinding work can be improved.

  In addition, the steel pipe end surface processing apparatus of the present invention includes an origin detection contact sensor that measures the separation distance between the disk and the end surface at the non-contact position. With this structure, the grinder support mechanism intermittently moves the grinder to the end face side to perform grinding processing, stops the grinder movement according to the measured value of the origin detection contact sensor, and overgrinds the end face. Can be prevented.

  Moreover, the steel pipe end surface processing apparatus of this invention is provided with the fixing jig used when a fixing mechanism fixes a steel pipe. A fixing region fixed by a fixing mechanism is provided on one end side of the fixing jig, and a fixing flange portion for fixing the flange portion of the steel pipe is provided on the other end side of the fixing jig. Yes. With this structure, the flange part of the steel pipe and the fixing flange part of the fixing jig are connected and fixed via a loose flange, so that the joint surface of the flange part on both ends of the steel pipe used for fluid piping is fixed. A flat surface can be formed by grinding.

  Moreover, in the end surface processing apparatus of the steel pipe of this invention, a fixing mechanism can rotate a steel pipe centering on the axial center of a steel pipe, fixing a steel pipe, and can move the contact area of a disc and an end surface. With this structure, it is possible to automate the grinding process for forming a flat surface on the end face of the steel pipe, and it is possible to eliminate the recent shortage of workers and the quality variation due to the skill of the workers.

  Moreover, in the end surface processing apparatus of the steel pipe of this invention, the grinder support mechanism can move a grinder along an end surface with respect to the steel pipe fixed to the fixing mechanism, and can move the contact area of a disc and an end surface. With this structure, it is possible to automate the grinding process for forming a flat surface on the end face of the steel pipe, and it is possible to eliminate the recent shortage of workers and the quality variation due to the skill of the workers.

BRIEF DESCRIPTION OF THE DRAWINGS It is the (A) side view and (B) front view explaining the end surface processing apparatus of the steel pipe of one Embodiment of this invention. It is a block diagram explaining the outline | summary of the end surface processing apparatus of the steel pipe of one Embodiment of this invention. It is (A) front view and (B) sectional drawing explaining the steel pipe ground by the end surface processing apparatus of the steel pipe of one Embodiment of this invention. It is (A) sectional drawing explaining the grinding process using the end surface processing apparatus of the steel pipe of one Embodiment of this invention, (B) It is sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is the (A) side view and (B) side view explaining the end surface processing apparatus of the steel pipe of one Embodiment of this invention. It is the (A) perspective view and (B) perspective view explaining the connection method of the steel pipe used for the conventional fluid piping.

  Below, the end surface processing apparatus 10 (henceforth "the end surface processing apparatus 10") of the steel pipe 11 which is one Embodiment of this invention is demonstrated in detail based on drawing. In the description of the present embodiment, the same reference numerals are used for the same members in principle, and repeated descriptions are omitted. Further, the vertical direction of the paper surface indicates the height direction of the end surface processing apparatus 10, the horizontal direction of the paper surface indicates the lateral width direction of the end surface processing apparatus 10, and the front-back direction of the paper surface indicates the depth direction of the end surface processing apparatus 10.

  First, FIG. 1 (A) is a side view illustrating the end face processing apparatus 10 of the present embodiment. FIG. 1B is a front view for explaining the end surface processing apparatus 10 of the present embodiment. FIG. 2 is a block diagram illustrating the end face processing apparatus 10 of the present embodiment.

  As shown in FIG. 1A, the end surface processing apparatus 10 mainly includes a fixing mechanism 12 for fixing the steel pipe 11, a grinder 13 for grinding the end surface of the steel pipe 11, and a grinder support mechanism 14 for supporting the grinder 13. An origin detection contact sensor 15 provided in the grinder support mechanism 14 for measuring the separation distance between the grinder 13 and the end surface of the steel pipe 11, a transport mechanism 16 for moving the grinder support mechanism 14, and a controller 17 (see FIG. 2). And have.

  The fixing mechanism 12 is fixed to the upper surface of the pedestal 19 of the end face processing apparatus 10. As the fixing mechanism 12, for example, a positioner manufactured by Matsumoto Machinery Co., Ltd. is used. The fixing mechanism 12 is mainly detachably disposed on the main body portion 12A and the rotary table 12B of the main body portion 12A, and is disposed in the main body portion 12A and the chuck portion 12C for fixing the end surface on one end side of the steel pipe 11. And a rotating part (not shown) for rotating the rotary table 12B at a constant speed.

  The chuck portion 12 </ b> C has, for example, three claw portions 12 </ b> D that support the outer peripheral surface of the steel pipe 11 on the front surface, and the claw portions 12 </ b> D are arranged on the circumference at intervals of 120 degrees. . And 12 A of main-body parts move the rotary table 12B and the chuck | zipper part 12C in the state which fixed the one end side of the steel pipe 11, and the steel pipe 11 is the axial center CL (extending direction (front-back direction of paper surface) of the steel pipe 11). Direction)) is substantially parallel to the upper surface of the pedestal 19 of the end face processing apparatus 10. Although the details will be described later, the rotating part in the main body part 12A rotates the rotary table 12B and the chuck part 12C, so that the steel pipe 11 rotates at a constant speed around the axis CL. With this structure, the grinder 13 is in a fixed state, but the joint surface 18A (see FIG. 1B) of the flange portion 18 that is the end surface of the steel pipe 11 can be ground over the entire circumference.

  The grinder 13 is fixed to the fixing portion 14B of the grinder support mechanism 14. As the grinder 13, for example, an electric disk grinder manufactured by Hitachi Koki Co., Ltd. is used. The grinder 13 mainly has a disk 13A for grinding the end surface of the steel pipe 11, and a main body part 13B for rotatably supporting the disk 13A. As will be described in detail later, at the time of grinding, the disk 13A is not always pressed against the end surface of the steel pipe 11, but uses an amplitude operation at the time of rotation so as to repeatedly hit the end surface of the steel pipe 11. To do.

  The grinder support mechanism 14 mainly includes a main body portion 14A fixed to the main column portion 16A of the transport mechanism 16, a fixing portion 14B that fixes the grinder 13, and the fixing portion 14B intermittently on the end face side of the steel pipe 11. And a drive unit 14 </ b> C that moves in the (front-back direction).

  Here, as shown in FIG. 1B, the drive portion 14C is disposed on the surface of the main body portion 14A facing the steel pipe 11 via the screw mechanism 14D. One end side of the screw mechanism 14D is led out from the side surface of the main body portion 14A, and a handle portion 14E is provided at the end portion of the screw mechanism 14D. With this structure, by operating the handle portion 14E, the drive portion 14C has a stroke amount of, for example, about 450 mm in the lateral width direction (left and right direction on the paper surface) of the end surface processing apparatus 10 with respect to the main body portion 14A. Can move. That is, the drive unit 14C can adjust the grinder 13 to an optimal position during grinding by moving in the lateral width direction of the end face machining apparatus 10 according to the diameter of the steel pipe 11 to be ground.

  As shown in FIG. 1A, the fixing portion 14B fixes the main body portion 13B of the grinder 13 using, for example, a fastening member such as a metal fitting, and with respect to the end surface of the steel pipe 11 due to vibration and reaction during grinding. The position of the fixed disk 13A is prevented from shifting. Furthermore, the fixing portion 14B also has an angle adjusting function, and the details of the fixing portion 14B will be described later. Can do.

  The drive unit 14C mainly includes a stepping motor (not shown) and a ball screw 14F, and connects the main body unit 14A and the fixed unit 14B. And the drive part 14C moves the fixing | fixed part 14B toward the end surface side of the steel pipe 11 by moving the ball screw 14F intermittently to the paper surface front-back direction, for example per 0.1 mm. With this structure, the drive unit 14 </ b> C is controlled by the control unit 17 at the time of grinding, and advances the disk 13 </ b> A of the grinder 13 toward the end surface side of the steel pipe 11 in accordance with the rotation speed and rotation speed of the steel pipe 11.

  The origin detection contact sensor 15 is disposed, for example, on the surface of the fixed portion 14B of the grinder support mechanism 14 that faces the steel pipe 11. Although details will be described later, the end face of the steel pipe 11 is excessively ground by performing the grinding process with the grinder 13 while measuring the separation distance between the grinder 13 and the end face of the steel pipe 11 by the origin detection contact sensor 15. The desired thickness of the flange portion 18 can be maintained even after grinding.

  The transport mechanism 16 is disposed on the upper surface of the pedestal 19 of the end face processing apparatus 10, and mainly includes a main pillar portion 16 </ b> A that supports the grinder support mechanism 14 and a pair of rail portions 16 </ b> B disposed on the upper surface of the pedestal 19. Have. The main pillar portion 16A is disposed on the upper surfaces of the pair of rail portions 16B, so that the upper surface of the pedestal 19 can be manually moved in the front-rear direction of the page. A stopper mechanism (not shown) is provided on the main column portion 16A, and the position of the grinder 13 in the front-rear direction of the paper surface with respect to the end surface of the steel pipe 11 can be adjusted. Although details will be described later, at the time of grinding, the main pillar portion 16A is fixed at a desired position, and then the fixing portion 14B is intermittently directed toward the end face side of the steel pipe 11 via the drive portion 14C of the grinder support mechanism 14. Therefore, the flat surface can be formed on the end surface of the steel pipe 11 with high positional accuracy.

  As shown in FIG. 2, the control unit 17 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and various control units for controlling the end face processing apparatus 10. It is an electronic control unit (ECU) that performs calculations and the like.

  The storage unit of the control unit 17 includes, for example, a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-only Memory), and stores various data necessary for controlling the end face processing apparatus 10.

  As described above, the end surface processing apparatus 10 rotates the rotary table 12B by the rotating portion of the fixing mechanism 12 and rotates the steel pipe 11 fixed by the chuck portion 12C at a constant speed, so that the end surface of the steel pipe 11 is rotated. Grind the entire circumference. Then, in the control unit 17, the driving unit 14 </ b> C of the grinder support mechanism 14 is appropriately driven through the timer 20 in accordance with the rotation speed of the steel pipe 11, and the fixing unit 14 </ b> B is intermittently directed toward the end surface side of the steel pipe 11. Move forward.

  At this time, the control unit 17 controls the drive unit 14C of the grinder support mechanism 14 so that the disk 13A of the grinder 13 does not approach the end surface of the steel pipe 11 from a desired set value based on the measurement result by the origin detection contact sensor 15. Control. That is, in the control unit 17, when the separation distance between the disk 13A and the end surface of the steel pipe 11 reaches the set value, the fixing unit 14B of the grinder support mechanism 14 moves forward toward the end surface side of the steel pipe 11. At the same time, the rotation of the disk 13A is stopped and the grinding process is terminated.

  Next, FIG. 3 (A) is a front view illustrating the steel pipe 11 that is ground by the end face processing apparatus 10 of the present embodiment. FIG. 3B is a cross-sectional view illustrating a steel pipe 11 that is ground by the end face processing apparatus 10 of the present embodiment.

  The steel pipe 11 is used as a fluid pipe for flowing a fluid such as waste water or gas in plant equipment such as a frozen food processing factory or a refrigerated food processing factory. As the steel pipe 11, for example, a stainless steel pipe for piping or a carbon steel pipe for piping is used. Since the fluid piping is laid in a desired path according to the design of each plant facility, the plurality of steel pipes 11 are connected to each other via a loose flange (not shown), a gasket (not shown), or the like. The

  Therefore, as shown in FIG. 3 (A), flange portions 18 are formed at both ends of the steel pipe 11, and a gasket is sandwiched between the joint surfaces 18A of the flange portions 18 at the connecting portions of the steel pipes 11, and the outer sides thereof. By firmly tightening with a loose flange, the joint surface 18A and the gasket are brought into close contact with each other, and water-stopping as fluid piping is realized.

  In addition, as shown in FIG. 3B, when a low-priced stainless steel pipe or a carbon steel pipe for piping is used as the steel pipe 11, the steel pipe 11 is formed by roll-forming the steel strip and the seam thereof is subjected to high-frequency electric resistance welding. Since the steel pipe 11 is manufactured by continuous welding with a machine or the like, an electric stitching portion 18B is formed in the longitudinal direction of the steel pipe 11. As a result, as shown in FIG. 3A, the joint surface 18A of the flange portion 18 also has an electric stitching portion 18B, and the electric stitching portion 18B has a convex shape with respect to the joint surface 18A in other regions. The flatness of 18A will be inhibited.

  On the other hand, when a carbon steel pipe for piping is used as the steel pipe 11, galvanization is performed over the entire surface of the steel pipe 11 including the inner and outer peripheries, and then a flare molding process is performed by warm or cold, and the flange Part 18 is formed. As a result, the flatness of the joint surface 18A is hindered by the galvanization being peeled off during the flare molding process. Moreover, in the steel pipe 11, since the whole is immersed in the plating bath and the galvanization is formed on the surface thereof, the film thickness of the galvanization tends to vary, and even in the situation where the galvanization peeling does not occur, the joint surface It is difficult to maintain the flatness of 18A.

  Therefore, the joint surface 18A of the flange portion 18 is ground by a grinder 13 or the like to form a flat surface. If the thickness T1 of the flange portion 18 is too thin, There is a problem in durability, such as the flange portion 18 being chipped. That is, it is necessary to secure a flat surface having a desired length L1 on the joint surface 18A and to secure a desired thickness T1 of the flange portion 18, and a processing method that does not excessively grind the flange portion 18 during grinding is required. Become.

  Next, FIG. 4A and FIG. 4B are cross-sectional views illustrating a grinding state using the end face processing apparatus 10 of the present embodiment.

  FIG. 4A shows a set state before grinding by the end surface processing apparatus 10 is started. A region indicated by an arrow L1 is a processing region 21 that forms a flat surface with respect to the joint surface 18A of the flange portion 18. The processing region 21 of the joint surface 18A is more in the radial direction than the center portion of the disk 13A. Outer grinding surfaces are arranged facing each other. Then, the machining area 21 of the joint surface 18A is in a state separated from the grinding surface of the disk 13A by about 1 mm as indicated by an arrow 22. That is, the disk 13A of the grinder 13 can prevent the flange portion 18 from being excessively ground by applying grinding to the processing region 21 of the joint surface 18A while maintaining a non-contact position with respect to the processing region 21.

  Although details will be described with reference to FIG. 4B, the disk 13A of the grinder 13 rotates at a high speed, and therefore, as indicated by an arrow 23, the amplitude operation of about 1 to 2 mm occurs at the tip of the disk 13A. Occur. Since the width of the amplitude operation becomes narrower toward the center of the disk 13A, the disk 13A is set so that the angle θ1 formed by the grinding surface of the disk 13A and the joint surface 18A is not less than 1 degree and not more than 5 degrees. The tip end side is inclined to the joint surface 18A side.

  When the angle θ1 is smaller than 1 degree, in other words, as the grinding surface of the disk 13A and the joint surface 18A approach the parallel position, the contact area between the grinding surface of the disk 13A and the joint surface 18A decreases. The working time for forming a desired flat surface in the processing region 21 of the joint surface 18A becomes long, and is not suitable for mass productivity. On the other hand, when the angle θ1 is larger than 5 degrees, in other words, as the angle θ1 between the grinding surface of the disk 13A and the joint surface 18A increases, similarly, the grinding surface and the joint surface of the disk 13A. The contact area with 18A becomes small, which is not suitable for mass production. Further, when the disk 13A and the joint surface 18A are in contact with each other, the ground surface of the disk 13A is strongly pressed against the joint surface 18A, the flange portion 18 is excessively ground, and the flange portion 18 is There is a risk of not meeting durability.

  As described above, by maintaining the angle θ1 at 1 ° or more and 5 ° or less, the contact area between the grinding surface of the disk 13A and the joint surface 18A is increased, which is suitable for mass productivity, and the grinding surface of the disk 13A is a joint surface. It is possible to prevent the joint surface 18A from being excessively ground without excessively pressing the 18A. In other words, the non-contact position of the disk 13A means that in the machining region 21 of the joint surface 18A, the separation distance between the disk 13A and the joint surface 18A is narrower than the maximum amplitude width at the tip of the disk 13A, and the angle θ1. The front end side of the disk 13A is inclined to the joint surface 18A side.

  FIG. 4B shows a state in which grinding by the end face processing apparatus 10 is performed. In the machining area 21 of the joint surface 18A, as indicated by an arrow 23, the tip side of the disk 13A greatly swings, the solid line indicates the state where the disk 13A is closest to the joint surface 18A side, and the dotted line indicates the disk 13A. Indicates a state farthest from the joint surface 18A.

  At the time of grinding, the disk 13A rotates at a high speed at the non-contact position described with reference to FIG. 4A, and the amplitude operation of the disk 13A generated by the high-speed rotation is used to flatten the processed area 21 on the joint surface 18A. Form a surface. Since the disk 13A rotates at a high speed, the speed of the amplitude operation of the disk 13A also increases. However, the ground surface of the disk 13A and the joint surface 18A have a solid line contact state and a dotted line non-contact state. It is repeating.

  As described above, the steel pipe 11 is slowly rotated via the rotating portion of the fixing mechanism 12, whereby the contact area between the grinding surface of the disk 13A and the joint surface 18A gradually moves. On the other hand, since the joint surface 18A is formed with an uneven surface due to the electro-sewn portion 18B (see FIG. 3A), galvanized peeling, or the like, the disk 13A is ground around the convex shape of the joint surface 18A. I do. And the flat surface is gradually formed in 18 A of joint surfaces because the steel pipe 11 rotates in multiple times.

  Here, as shown in FIG. 2, in the control unit 17, the driving unit 14 </ b> C of the grinder support mechanism 14 is appropriately driven via the timer 20 in accordance with the rotation speed of the steel pipe 11, and the fixing unit 14 </ b> B is connected to the steel pipe 11. Advances intermittently toward the end face. For example, every time the steel pipe 11 rotates 5 times, the disc 13A of the grinder 13 is advanced 0.1 mm toward the joint surface 18A, so that the concave shape of the joint surface 18A is ground after grinding the convex shape of the joint surface 18A. Is also ground, a flat surface is formed on the joint surface 18A.

  Before the set state shown in FIG. 4A is completed, the tip of the disk 13A is once brought into contact with the joint surface 18A, the origin is detected by the origin detection contact sensor 15, the set state is set, and grinding is started. . During the grinding process, the control unit 17 monitors the measurement value of the origin detection contact sensor 15 so that it can be ground by about 2 mm from the surface of the joint surface 18A, and the flange portion 18 is excessively ground. Thus, the desired thickness of the flange portion 18 can be maintained even after grinding.

  As described above, the grinder 13 is normally used in a state in which the grinder 13 is always pressed against the joint surface 18A. However, in the end face machining apparatus 10 of the present embodiment, the grinding surface of the disk 13A is against the joint surface 18A. The grinding process is performed while repeating the contact state indicated by the solid line and the non-contact state indicated by the dotted line. With this structure, a flat surface is gradually formed on the joint surface 18A, and the flange portion 18 is prevented from being unnecessarily ground. Has a desired durability and can form a high-quality fluid pipe.

  Next, FIG. 5A is a side view for explaining the fixing jig 31 used in the end surface processing apparatus 10 of the present embodiment. FIG. 5B is a side view for explaining a state in which the steel pipe 11 is fixed using the fixing jig 31 shown in FIG.

  As shown in FIG. 5A, the fixing jig 31 is made of the same material as the steel pipe 11 and has a main body 33 having a flange 32 formed on one end thereof, and a loose flange inserted into the main body 33. 34. As described above, the steel pipe 11 used for fluid piping often has flange portions 18 formed at both ends thereof. In this case, as shown in FIG. The fixing mechanism 12 cannot fix the steel pipe 11.

  Therefore, as shown in FIG. 5 (B), the fixing region 35 on the other end side where the flange portion of the fixing jig 31 is not formed is fixed by the fixing mechanism 12 of the end surface processing apparatus 10, and the steel pipe 11 is subjected to grinding. And the fixing jig 31 are fixed via the loose flange 34. With this structure, the end face processing apparatus 10 can perform the above-described grinding process on the steel pipe 11 having the flange portions 18 formed at both ends. In addition, even if it fixes the pipe diameter by the side of the fixing | fixed area | region 35 by using a reducer pipe | tube as the main-body part 33 of the fixing jig 21, it corresponds to the steel pipe 11 of 65A-200A on the flange part 32 side, for example. be able to.

  At this time, even when the length of the steel pipe 11 to be ground is increased by being connected to the fixing jig 31, the mounting table that supports the outer peripheral surface from below at the intermediate portion in the extending direction of the steel pipe 11. (Not shown). As described above, when the steel pipe 11 is rotated, the joint surface 18A of the flange portion 18 of the steel pipe 11 is ground. By supporting the intermediate portion from below, the flange portion 18 is subjected to the grinding. The blurring is prevented, and the processing accuracy by the disk 13A can be increased. The mounting table is not necessarily an essential member, and is used when the steel pipe 11 is long and holds the parallel position of the steel pipe 11.

  With this structure, it is possible to grind various shapes of the steel pipe 11 with a single end face processing apparatus 10 and to form various shapes of fluid piping. In addition, the end face processing apparatus 10 is suitable for mass productivity and quality stability by machining, and it is not necessary to secure skilled workers. Furthermore, by using the amplitude operation during the rotation of the disk 13A, the disk 13A is not always pressed against the machining area 21 of the joint surface 18A, but by grinding so as to strike the flange portion 18 It can prevent grinding too much.

  In this embodiment, the grinder 13 is rotated on the joint surface 18A of the flange portion 18 of the steel pipe 11 by rotating the steel pipe 11 with the fixing mechanism 12 in a state of being fixed via the grinder support mechanism 14 or the like. Although the case where grinding was performed over the circumference has been described, the present invention is not limited to this case. For example, the grinder support mechanism 14 may be rotated along the joint surface 18A of the flange portion 18 of the steel pipe 11 so that the steel pipe 11 is fixed. In this case, for example, the main body portion 14A of the grinder support mechanism 14 is movable in the vertical direction on the paper surface with respect to the main column portion 16A of the transport mechanism 16 and has a mechanism that is movable in the horizontal direction on the paper surface. This can be realized by controlling the moving speed in both directions. In addition, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 End surface processing apparatus 11 Steel pipe 12 Fixing mechanism 12A Main body part 12B Rotary table 12C Chuck part 12D Claw part 13 Grinder 13A Disk 13B Main body part 14 Grinder support mechanism 14A Main body part 14B Fixing part 14C Drive part 14D Screw part 14E Handle part 14F Ball screw 15F Origin detection contact sensor 16 Conveying mechanism 16A Main column part 16B Rail part 17 Control part 18 Flange part 18A Joint surface 18B Electric seam part 19 Base 20 Timer 21 Processing area

In the steel pipe end face processing apparatus of the present invention, a fixing mechanism for fixing one end of the steel pipe, a grinder for grinding the end face on the other end of the steel pipe, and a disk for the grinder at a position where the disc can be ground with respect to the end face. A grinder support mechanism for supporting the disc, and the grinder support mechanism is arranged such that the disc is positioned at a non-contact position where a separation distance between the disc and the end surface is smaller than a maximum amplitude width of a tip of the disc. supporting said grinder, said disc during rotation of that, from said non-contact position, and wherein and the repeat score a non-contact state and the state of contact between the O Ri before Symbol end face to the amplitude behavior of the disc To do.

Claims (6)

A fixing mechanism for fixing one end of the steel pipe;
A grinder for grinding an end face of the other end of the steel pipe;
A grinder support mechanism for supporting the grinder disk at a position where it can be ground with respect to the end face;
The grinder support mechanism is configured to change a contact state and a non-contact state between the disk and the end surface by an amplitude operation of the disk from a non-contact position where the disk and the end surface are not always in contact when the disk rotates. A steel pipe end face processing apparatus, characterized by supporting the grinder so as to repeat. The end surface is a joint surface of a flange portion formed by flaring the steel pipe,
The grinder support mechanism disposes the disk at the non-contact position so as to have a region facing the joint surface, and in the facing region, the outer peripheral end side of the disk from a position parallel to the joint surface. The steel pipe end face processing apparatus according to claim 1, wherein the disk is disposed so as to be inclined toward the joint surface side. Furthermore, an origin detection contact sensor that measures a separation distance between the disk and the end surface at the non-contact position,
When the disk rotates, the grinder support mechanism intermittently moves the grinder to the end face side, and stops the movement of the grinder according to the measurement value of the origin detection contact sensor. The steel pipe end surface processing apparatus according to claim 2. And a fixing jig used when the fixing mechanism fixes the steel pipe,
A fixing region fixed by the fixing mechanism is provided on one end side of the fixing jig, and a fixing flange portion on which the flange portion of the steel pipe is fixed is provided on the other end side of the fixing jig. Provided,
The said fixing jig has a loose flange, The end surface processing apparatus of the steel pipe of Claim 2 or Claim 3 characterized by the above-mentioned.   The said fixing mechanism rotates the said steel pipe centering | focusing on the axial center of the said steel pipe, fixing the said steel pipe, and moves the contact area of the said disk and the said end surface. The end surface processing apparatus of the steel pipe of any one of these.   The said grinder support mechanism moves the said grinder along the said end surface with respect to the said steel pipe fixed to the said fixing mechanism, and moves the contact area of the said disk and the said end surface. The end surface processing apparatus of the steel pipe of any one of Claim 4.

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