JP6509045B2 - Device and method for manufacturing end reduced diameter tube - Google Patents

Description

  The present invention relates to an apparatus and a method for manufacturing an end reduced diameter tube, which reduces the diameter of the end of a cylindrical tube to manufacture an end reduced diameter tube.

  For example, when connecting ducts for air conditioning, conventionally, insert one end of a tubular plug-in joint into the end of one duct and plug the other end of the plug-in into the other end of the duct , Screwing etc. to both insertion parts. However, in this method, since a plug-in joint is additionally required in addition to the duct, not only the cost of the members is increased, but screwing or the like must be performed on the two plug-in parts, which requires time and cost.

  For this reason, the spiral pipe which made the insertion joint unnecessary by diameter-reducing the pipe end itself is known (for example, refer to patent documents 1.). This spiral tube reduces the end bore diameter of the tube, forms a plurality of groove-like recesses in the reduced portion (diameter reducing end), and inserts the reduced portion into the spiral tube to be connected. It is unnecessary.

Japanese Patent Application Laid-Open No. 06-066394

  By the way, it is not specifically disclosed by patent document 1 about how to reduce the end diameter of a spiral tube and to form several groove-shaped recessed parts in a shrinking | reduction part. For this reason, even if it is going to manufacture a spiral pipe (end part diameter reduction pipe) which was indicated by patent documents 1, it is difficult to manufacture appropriately and efficiently.

  Therefore, an object of the present invention is to provide an apparatus and a method for manufacturing an end reduced diameter tube capable of manufacturing the end reduced diameter tube properly and efficiently.

  In order to achieve the above object, the invention according to claim 1 is an apparatus for producing an end reduced diameter tube, which reduces the diameter of the end of a cylindrical tube to produce an end reduced diameter tube. A cylindrical inner die disposed within the end of the tube and an annular outer die disposed around the outer periphery of the end of the tube, the inner die having substantially the same diameter as the inner diameter of the tube An inner-type reduced-diameter portion having an inner-type same-diameter portion; and an outer-portion reduced-diameter portion concentric with the inner-type same-diameter portion and smaller in diameter than the inner-type same-diameter portion and axially extending on the outer peripheral surface The outer die is movable forward and backward with respect to the inner die diameter reducing portion, and the inner peripheral surface is provided with a forming punch axially extending in the axial direction and fitted with the forming groove; By advancing to the inner die reduced diameter portion side, the outer die and the inner die reduced diameter portion reduce the diameter across the end of the tube and form an axially extending groove-like recess. It features.

  According to the present invention, the inner mold is disposed in the end of the pipe, the outer mold is arranged on the outer periphery of the end of the pipe, and the outer mold is advanced toward the inner mold reduced diameter portion. The end of the tube is pinched (compressed) with the diameter reducing portion to form a diameter reducing end, and a groove-like recess is formed at the diameter reducing end by the forming groove and the forming punch.

  The invention according to claim 2 is characterized in that, in the manufacturing apparatus according to claim 1, the outer mold is configured by arranging a plurality of fan-shaped outer mold parts in an annular shape.

  The invention according to claim 3 is the manufacturing apparatus according to claim 1 or 2, wherein the inner-type same diameter portion is freely diameter-reduced, and the end of the pipe in which the groove-like recess is formed in a state where the diameter is reduced. It is characterized in that the part is passable.

  The invention according to claim 4 is the manufacturing apparatus according to claim 3, further comprising: an extruding member for extruding the end of the pipe from the inner die in a state where the diameter of the inner die is reduced. It is characterized by

  The invention according to claim 5 is the manufacturing apparatus according to claim 4, wherein when the outer mold retracts from the inner mold reduced diameter portion side, the diameter of the inner mold same diameter portion is reduced and the extrusion is performed. It has a discharge mechanism which pushes out the tube by a member.

  The invention according to claim 6 is that, in the manufacturing apparatus according to claims 1 to 5, a plurality of the inner molds having different outer diameters and a plurality of the outer molds having different inner diameters are detachable. It is characterized by

  The invention according to claim 7 is a method for manufacturing an end reduced diameter pipe using the manufacturing apparatus according to any one of claims 1 to 6, wherein the inner mold is disposed in the end of the pipe. Placing the outer mold around the outer periphery of the end of the pipe, and supporting the pipe so that the axial center of the pipe extends along the axial center of the inner mold; It is characterized in that it is advanced to the mold reduced diameter portion side.

  According to the first aspect of the present invention, the end portion of the tube is compressed by the outer mold and the inner diameter reducing portion to form a diameter reducing end (a diameter reducing end) and a groove-like recess. At this time, since the portion (boundary portion) adjacent to the reduced diameter end portion is supported (maintained in shape) by the inner die same diameter portion, the reduced diameter end tube can be properly formed without the boundary portion being deformed or reduced in diameter. It becomes possible to manufacture. In addition, since it is sufficient to arrange the inner and outer molds inside and outside the end of the pipe and advance the outer mold toward the inner diameter reducing portion, efficient manufacturing of the end diameter reducing pipe can be achieved. It becomes possible.

  According to the second aspect of the present invention, since the outer mold is constituted by the plurality of outer mold parts, it is possible to facilitate the mechanism for moving the outer mold back and forth. In addition, there is no need to repair or replace the entire outer mold when damage or breakage occurs, and it is sufficient to repair or replace only the damaged outer part, thereby reducing the time and cost required for repair and replacement. Is possible.

  According to the third aspect of the present invention, the diameter-reduced end portion in which the groove-like recess is formed can pass through the inner diameter portion by reducing the diameter of the inner diameter portion. It can be easily removed from the inner mold.

  According to the invention as set forth in claim 4, the pipe can be easily taken out from the inner mold after processing by pushing the pipe from the inner mold with the push-out member in a state where the inner mold same diameter portion is reduced in diameter. .

  According to the invention of claim 5, when the outer mold retracts from the inner mold reduced diameter portion side, that is, after processing of the end of the pipe, the discharge mechanism automatically shrinks the inner mold same diameter portion. Since the diameter is pushed and the pipe is pushed out of the inner mold by the pushing member, it is possible to efficiently manufacture the end diameter reducing pipe.

  According to the invention as set forth in claim 6, since a plurality of inner and outer molds having different diameters are detachable, it is possible to process the end of the pipe having different diameters with one manufacturing device, and the facility cost is reduced. It is possible to efficiently manufacture the end diameter reducing tube.

  According to the invention as set forth in claim 7, the tube is supported so that the axial center of the tube extends along the axial center of the inner mold (concentrically), that is, the position and angle of the pipe relative to the inner mold are appropriate. In this state, since the end of the tube is processed, the end diameter reducing tube can be properly manufactured.

It is a perspective view which shows the manufacturing apparatus of the edge part diameter reducing tube which concerns on embodiment of this invention. It is the front view (a) and side view (b) which show the end part diameter reducing pipe | tube which concerns on embodiment of this invention. It is a perspective view which shows the arrangement | positioning state of the 1st inner mold | type diameter reduction body of the manufacturing apparatus of FIG. It is a front view which shows the arrangement | positioning state of FIG. It is the top view (a) and front view (b) which show the 2nd inner die diameter reduction body of the manufacturing apparatus of FIG. It is a perspective view which shows the arrangement | positioning state of the 2nd inner mold | type diameter reduction body of FIG. It is a front view which shows the arrangement | positioning state of FIG. It is a perspective view which shows the state which arrange | positioned the pushing rod from the state of FIG. It is a front view which shows the installation state of FIG. It is a perspective view which shows the installation state of the inner-type same diameter body of the manufacturing apparatus of FIG. It is a front view which shows the arrangement | positioning state of FIG. It is a front view (a) and a side view (b) showing the inner type same diameter parts of the inner type same diameter object of FIG. It is a perspective view which shows the arrangement | positioning state of the outer mold | type of the manufacturing apparatus of FIG. It is a front view which shows the arrangement state of FIG. It is the top view (a) and front view (b) which show the outer mold part of the outer mold | type of FIG. It is a front view which shows the discharge mechanism of the manufacturing apparatus of FIG. It is a perspective view which shows the state which the internal-type same diameter body of FIG. 10 diameter-reduced. It is a perspective view which shows the state which the inner-type same diameter body of FIG. 10 diameter-expanded. It is a conceptual diagram which shows the state before the process start of the discharge mechanism of FIG. It is a conceptual diagram which shows the state in process of the discharge mechanism of FIG. It is a conceptual diagram which shows the state after processing of the discharge mechanism of FIG.

  Hereinafter, the present invention will be described based on the illustrated embodiments.

  1 to 21 show an embodiment of the present invention, and FIG. 1 shows an apparatus for manufacturing an end reduced diameter pipe according to the embodiment of the present invention (hereinafter referred to as “end reduced diameter pipe manufacturing apparatus” as appropriate. It is a perspective view showing 1). The end reduced diameter tube manufacturing apparatus 1 is an apparatus for reducing the diameter of the end of a cylindrical tube to manufacture an end reduced diameter tube 10, and can cope with a plurality of tubes having different diameters. Here, in this embodiment, as shown in FIG. 2, one end of the spiral pipe 11 which is a duct for air conditioning is reduced in diameter (small diameter processing) to form a reduced diameter end 12 and this reduced diameter end The case where a plurality of groove-shaped recesses 13 extending in the axial direction are formed in the portion 12 will be described.

  The spiral tube 11 is formed by spirally winding a band material and extends straight. Further, the outer diameter of the reduced diameter end 12 is set to be slightly smaller than the inner diameter of the spiral tube 11, and the reduced diameter end 12 (including the gob portion 14) can be inserted into the other end of the other spiral tube 11. It has become. Furthermore, the shape and size of the groove-like recess 13 and the number of formation (four in this embodiment) are set such that the diameter reduction end 12 is formed by reducing the diameter of the spiral tube 11 without deformation or wrinkles. It is done. The code | symbol 14 in FIG. 2 is a convex-shaped haze part formed in order to join the edges of a strip material, when forming the spiral pipe 11. As shown in FIG.

  As shown in FIG. 1, in the end reduced diameter tube manufacturing apparatus 1, a Y-shaped tube support 24 is disposed on one end side of a base 21 movable by a car 22. A roller 241 is rotatably disposed at a branch portion (V-shaped portion) of the tube support 24, and is vertically moved by turning the handle 242, as described later, while the spiral tube 11 is horizontally supported and spiraled. The tube 11 can be slid axially.

  Further, on the other end side of the base 21, a flat-plate-like processing board 23 is disposed so that the board surface is vertically oriented. An inner die 3, an outer die 4, a push rod (push member) 5, and a discharge mechanism 6 are mainly disposed in the processing plate 23.

  The inner die 3 is a cylindrical mold disposed in the end of the spiral tube 11, and has an inner die same diameter body (inner die same diameter portion) 31 which has substantially the same diameter as the inner diameter of the spiral tube 11, and Inner diameter reducing bodies (inner diameter reducing portions) 32 and 33 which are smaller in diameter than the inner diameter body 31 are concentric with the same diameter body 31.

  The first inner reduced-diameter body 32 is a die for forming the reduced-diameter end 12 of the spiral tube 11 to be processed with a cylindrical shape and the minimum diameter, and as shown in FIGS. 3 and 4, It is disposed in the board 23. That is, a recessed disk-shaped housing portion 231 is formed on the front surface of the processing board 23, and the first inner-diameter-diameter reducing body 32 has its axis at the central portion of the end surface plate (bottom surface portion) 232 of the housing portion 231. The heart is arranged to extend horizontally. The outer diameter and the length of the first inner reduced diameter body 32 are set to substantially the same size as the inner diameter and the length of the reduced diameter end 12 of the spiral tube 11 to be processed, and the outer peripheral surface is axially A plurality of extending concave (semicircular) forming grooves 321 are formed at equal intervals (four at 90 degrees in this embodiment). The formed groove 321 is formed in substantially the same shape as the outer diameter (outer diameter) of the groove-shaped recess 13 of the spiral tube 11 to be processed.

  Further, a plurality of semicircular guide grooves 322 extending in the axial direction are formed at equal intervals (four at 90 degrees in this embodiment) on the outer peripheral surface of the first inner reduced diameter body 32. . On the other hand, in the end face plate 232 of the housing portion 231, a plurality of guide holes 233 are formed radially from the center at predetermined intervals, and the guide holes 233 on the center side and the guide grooves 322 concentrically overlap. And when not mounting | wearing with the 2nd inner type diameter reduction body 33, the pushing rod 5 mentioned later is inserted in the guide hole 233 and the guide groove 322. As shown in FIG.

  Further, the control rod 61 is disposed slidably in the axial direction through the central portion of the first inner reduced diameter body 32 and the end surface plate 232 of the housing portion 231. Furthermore, a plurality of (four in this embodiment) positioning pins 323 are disposed on the center side at the open end face (the end face on the front side) of the first inner reduced diameter body 32, and the positioning pins 323 A plurality of (four in this embodiment) screw holes 324 are formed on the outer peripheral side.

  The second inner reduced-diameter body 33 is a type for forming the reduced-diameter end 12 of the spiral tube 11 to be processed, and as shown in FIG. The outer diameter of the reduced diameter body 32 is set to substantially the same size, and can be inserted into and fitted to the first inner reduced diameter body 32. Further, the outer diameter and the length are set to substantially the same size as the inner diameter and the length of the reduced diameter end portion 12 of the spiral tube 11 to be processed. Furthermore, on the outer peripheral surface, similarly to the first inner die diameter reducing body 32, a plurality of formed grooves 331 having substantially the same shape as the outer shape (outer diameter) of the grooved recess 13 of the spiral tube 11 to be processed are equally spaced. While being formed, a plurality of guide grooves 332 are formed at equal intervals.

  Further, a plurality of (two in this embodiment) screw insertion holes 333 are formed to penetrate from the free end face (end face on the front side) of the second inner-diameter-constricting body 33 to the other end face. On the other hand, a plurality of screw holes (not shown) concentric with the screw insertion holes 333 are formed in the end surface plate 232 of the housing portion 231.

  Then, as shown in FIG. 6 and FIG. 7, the first inner reduced diameter body 32 is inserted into the second inner reduced diameter body 33, and the second inner reduced diameter body 33 is rotated to guide The groove 332 is aligned with the guide hole 233. Next, as shown in FIG. 8 and FIG. 9, the push rod 5 is inserted into the guide hole 233 and the guide groove 332 to position the second inner reduced diameter body 33, and a bolt (for example, , A hexagonal hole bolt) 334 is inserted and tightened in the screw hole of the housing portion 231, and the second inner reduced diameter body 33 is attached.

  The inner-type same diameter body 31 is disc-like, and is detachably attached to the open end face of the first inner-type reduced-diameter body 32, and further, the diameter reduction is possible, and the groove-like recess 13 is formed in the state where the diameter is reduced. The end of the pyral pipe 11 can pass through. That is, as shown in FIGS. 10 and 11, a plurality of fan-shaped (four in this embodiment) inner type equal-diameter parts 311 are arranged in an annular shape.

  As shown in FIG. 12, each inner-shaped same-diameter part 311 is formed with a fan-shaped control rod insertion hole 312 at its central portion, and a long bolt insertion hole 313 extending radially in the central portion. A long slot-like pin mounting groove 314 extending in the radial direction is formed on the rear surface side. In addition, a concave rubber mounting groove 315 for mounting a rubber wheel 60 described later is formed on the side surface on the arc side.

  Then, as shown in FIGS. 10 and 11, the pin mounting groove 314 is attached to the positioning pin 323 of the first inner reduced diameter body 32, and the shoulder bolt 316 is inserted from the bolt insertion hole 313 The screw holes 324 of the inner reduced diameter body 32 are tightened. At this time, even if the shoulder bolt 316 is tightened, the inner-part same diameter part 311 is not fixed and is guided by the bolt insertion hole 313 and the pin mounting groove 314 to be movable in the radial direction.

  In this manner, all the inner-type equal-diameter parts 311 are movably attached to the first inner-diameter reduced-diameter body 32, and the outer diameter of the inner-type equal-diameter body 31 becomes the maximum diameter in the state of being located the outermost periphery The outer diameter of the inner-type body 31 with the same diameter becomes the minimum diameter in a state where the diameter is reduced to the most central position. Then, the maximum diameter of the inner-type body 31 is set to substantially the same size as the inner diameter of the spiral tube 11 to be processed, and the minimum diameter allows passage of the reduced-diameter end 12 in which the groove-like recess 13 is formed. (Less than the diameter of the circle connecting the bottoms of all the groove-like recesses 13). Furthermore, the length and thickness of the inner-type same-diameter body 31 are set so that the portion (boundary portion) 11a adjacent to the reduced-diameter end portion 12 can be properly supported (shape maintenance).

  As described above, the second inner reduced diameter body 33 having a different outer diameter is attached to the first inner reduced diameter body 32, and the inner shaped body 31 having a different outer diameter (maximum diameter) is By attaching to the inner diameter reducing body 32, a plurality of inner dies 3 having different outer diameters can be detachably attached, and the inner shape 3 corresponding to the diameter reducing end 12 of the spiral tube 11 to be processed can be attached. .

  The outer mold 4 is an annular mold disposed concentrically with the inner mold 3 on the outer periphery of the end of the spiral tube 11 as shown in FIG. 13 and FIG. When the second inner reduced diameter body 33 is not attached, it can move forward and backward with respect to the first inner reduced diameter body 32). That is, a plurality of fan-shaped (four in this embodiment) outer mold parts 41 are arranged in an annular shape, and each outer mold part 41 moves in the radial direction, thereby reducing the inner mold diameter reducing body 32, It is possible to move forward and backward against 33.

  The inner diameter of each outer mold part 41 is set to substantially the same diameter as the outer diameter of the reduced diameter end portion 12 of the spiral tube 11 to be processed, and the axial length is the length of the inner reduced diameter body 32, 33 That is, the length is set to be substantially the same as the length of the reduced diameter end 12. Further, as shown in FIG. 15, a forming punch 411 which is convex on the inner circumferential surface and extends in the axial direction so as to fit in the forming grooves 321 and 331 is formed, and the forming grooves 321 and 331 form the spiral tube 11. The groove-like recess 13 is formed by sandwiching and pressing the end. Furthermore, a concave relief groove 412 is formed on the inner circumferential surface along the shape of the gouged portion 14 of the spiral tube 11 so that the gouged portion 14 is released (stored) when the end of the spiral tube 11 is pressed. It has become.

  Further, a cylindrical mounting cylinder 413 is provided at the center of the outer peripheral surface of each outer mold part 41, and a mounting bolt 414 penetrating to the inside of the cylinder is screwed to the peripheral wall of the mounting cylinder 413. On the other hand, a plurality of (four in this embodiment) outer mold hydraulic cylinders are disposed in the processing plate 23, and the rods 234 (FIG. 3, FIG. 6, etc.) of the outer mold hydraulic cylinders are attached Each outer mold part 41 is disposed by inserting it into 413 and tightening a mounting bolt 414.

  Furthermore, a rectangular parallelepiped guide block 415 is provided on the lower end surface of each outer mold part 41. On the other hand, as shown in FIG. 14, the end face plate 232 of the housing portion 231 of the processing board 23 has a plurality of elongated hole-like guide holes 235 extending radially from the central portion (the inner diameter reducing members 32 and 33 side). The guide block 415 of each outer mold part 41 is inserted into and attached to the guide hole 235 (four in this embodiment). In such a state, the rod 234 of the outer hydraulic cylinder moves forward and backward, whereby the guide block 415 is guided along the guide hole 235, and the outer mold parts 41 become the inner diameter reducing bodies 32, 33. They move against and against.

  Then, by moving each outer mold part 41 (outer mold 4) to the inner mold diameter reducing body 32, 33, the end of the spiral tube 11 is formed by the outer mold 4 and the inner mold diameter reducing parts 32, 33. The diameter reducing end 12 and the groove-like recess 13 are formed by sandwiching (compression molding). Further, by attaching the outer mold parts 41 having different inner diameters (arc radiuses) as described above, the plurality of outer molds 4 having different inner diameters can be freely attached and detached according to the reduced diameter end 12 of the spiral tube 11 to be processed. The outer mold 4 can be attached.

  The push rod 5 is a member for pushing out the end (diameter reducing end 12) of the spiral tube 11 from the inner mold 3 in a state in which the diameter of the inner die 31 is reduced. That is, the long round rod is inserted into the guide hole 233 and the guide grooves 322 and 332 as described above, and as shown in FIG. 16, the proximal end (the end protruding from the back surface of the end plate 232 of the processing machine 23 Section) is connected to the connection plate 62. That is, a hole is formed in the connecting plate 62 at a position facing the guide hole 233, and the base end portion (screw portion) of the push rod 5 is inserted into this hole and connected to the connecting plate 62 by the nut 64. There is. Then, as described later, the discharge cylinder 63 is driven at a predetermined timing to advance the connecting plate 62 to the inner mold 3 side, whereby the push rod 5 advances in the axial direction with respect to the inner mold 3. The tip end of the push rod 5 pushes the end of the reduced diameter end 12 to push the spiral tube 11 out of the inner die 3.

  In the discharge mechanism 6, when the outer die 4 retracts / retracts from the inner die diameter reducing body 32, 33, the diameter of the inner die same diameter body 31 is reduced and the spiral tube 11 is removed from the inner die 3 by the push rod 5. It is a pushing mechanism. The discharge mechanism 6 mainly includes a rubber ring 60, a control rod 61, a connection plate 62, and a discharge cylinder 63.

  The rubber ring 60 is a stretchable rubber ring, and as shown in FIG. 17, is attached to the rubber mounting groove 315 of each inner type same diameter part 311 so as to bundle each inner type same diameter part 311. Then, in a state in which no external force is applied, squeezing, and in a state in which the tapered portions 611 of the control rods 61 described later do not press the inner diameter parts 311, the inner diameter parts 311 are urged toward the center. Then, the inner diameter body 31 is reduced in diameter.

  The control rod 61 has a round bar-like shape, and penetrates the first inner diameter reducing body 32 and the end face plate 232 of the processing disc 23, and the base end (the end protruding from the back face of the end face plate 232) Is linked to In addition, on the tip end side, a truncated cone shaped taper portion 611 which is expanded in diameter toward the tip end is provided. Then, the discharge cylinder 63 is driven to retract the control rod 61 (the tip end approaches the inner die 31), and as shown in FIG. Is fitted to the control rod insertion hole 312, and presses each inner die same diameter part 311 to the outer peripheral side, and the inner die same diameter body 31 is expanded in diameter (becomes the maximum diameter). On the other hand, the discharge cylinder 63 is driven to advance the control rod 61, whereby the fitting of the tapered portion 611 is released, and as shown in FIG. Do.

  The discharge cylinder 63 is a double acting hydraulic cylinder having two rods, and is disposed at the center of the back surface of the end face plate 232 of the processing plate 23, one rod is connected to the control rod 61, and the other rod is connected It is connected to the plate 62. Then, the control rod 61 and the connecting plate 62 (push rod 5) are moved forward by forward driving, and the control rod 61 and the connecting plate 62 (push rod 5) are retracted by reverse driving. The discharge cylinder 63 is driven and controlled together with an outer mold hydraulic cylinder for advancing and retracting the outer mold 4, and the outer mold 4, the inner mold body 31, the push rod 5 and the like perform predetermined movements.

  First, as shown in FIG. 19, in a state before the end of the spiral tube 11 is inserted into the inner mold 3 and the processing is started, the outer mold 4 (each outer mold part 41) is retracted from the inner mold 3. The control rod 61 and the push rod 5 are also retracted. At this time, the inner diameter body 31 is expanded by being pressed by the tapered portion 611 of the control rod 61, and the tip of the push rod 5 is retracted from the surface of the end surface plate 232.

  Next, when machining is started, as shown in FIG. 20, the outer mold 4 (each outer mold part 41) advances to the inner mold 3 side, and a spiral is formed between the outer mold 4 and the inner mold reduced diameter portions 32, 33. The end of the tube 11 is compression molded to form a reduced diameter end 12 and a groove-like recess 13. At this time, the control rod 61 and the push rod 5 remain retracted.

  Subsequently, as shown in FIG. 21, the outer die 4 (each outer die part 41) is retracted and retracted from the inner die 3, and the control rod 61 and the push rod 5 are advanced. As a result, the pressing of the inner diameter parts 311 by the tapered portion 611 of the control rod 61 is released, and the inner diameter body 31 is reduced in diameter by the rubber ring 60. Then, the push rod 5 pushes the diameter reducing end 12 and the spiral tube 11 is pushed out of the inner mold 3.

  Next, the operation of the end reduced diameter tube manufacturing apparatus 1 having such a configuration and a method for manufacturing the end reduced diameter tube 10 using the end reduced diameter pipe manufacturing apparatus 1 will be described.

  First, the inner mold 3 and the outer mold 4 corresponding to the spiral tube 11 to be processed are disposed on the processing plate 23 (mold setting step). That is, the second inner reduced diameter body 33 having an outer diameter corresponding to the inner diameter of the reduced diameter end 12 of the spiral tube 11 to be processed is attached to the first inner reduced diameter body 32 (FIG. 6, FIG. 7) ). Here, when the outer diameter of the first inner reduced diameter body 32 corresponds to the inner diameter of the reduced diameter end portion 12, the second inner reduced diameter body 33 is not attached. Then, the push rod 5 is inserted into the guide hole 233 and the guide grooves 322 and 332 (FIGS. 8 and 9), and the base end of the push rod 5 is connected to the connecting plate 62 (FIG. 16).

  In addition, the inner same diameter body 31 of the outer diameter according to the inner diameter of the spiral tube 11 to be processed is attached to the open end face of the first inner reduced diameter body 32, and the rubber ring 60 is attached (FIG. 10, FIG. 11). Further, an outer mold 4 (outer part 41) having an inner diameter corresponding to the outer diameter of the diameter reducing end 12 of the spiral tube 11 to be processed is attached to the processing board 23 (FIG. 13, FIG. 14). Here, the outer die 4 may be attached after attaching the inner same diameter body 31 or the inner equivalent 31 may be attached after the outer die 4 is attached.

  Next, the inner die 3 is placed in the end of the spiral tube 11, and the outer die 4 is placed on the outer periphery of the end of the spiral tube 11 (tube insertion step). That is, with the outer mold 4 retracted from the inner mold 3, the end of the spiral pipe 11 is inserted between the inner mold 3 and the outer mold 4, and the end edge of the spiral pipe 11 is the end face plate 232 of the processing machine 23. Press on

  Subsequently, the spiral tube 11 is supported so that the axial center of the spiral tube 11 extends along the axial center of the inner die 3 (outer die 4) (tube supporting step). That is, the spiral pipe 11 is placed on the roller 241 of the pipe support 24 shown in FIG. 1, and the height of the roller 241 is moved up and down so that the spiral pipe 11 becomes horizontal. Thus, the spiral tube 11 is horizontally supported.

  In this state, machining is started (the apparatus 1 is operated), and the outer mold 4 is advanced to the inner diameter reducing bodies 32, 33 (machining step). Thus, as described above, the end of the spiral tube 11 is compression molded to form the diameter-reduced end 12 and the groove-shaped recess 13. At this time, a portion (boundary portion) 11 a adjacent to the reduced diameter end portion 12 is supported (maintained in shape) by the inner diameter body 31.

  Thereafter, the outer die 4 is retracted from the inner die diameter reducing bodies 32 and 33, the inner die same diameter body 31 is reduced in diameter by the discharge mechanism 6, and the diameter reducing end 12 is pushed out from the inner die 3 (Discharge step).

  As described above, according to the end reduced diameter tube manufacturing apparatus 1 and the method for manufacturing the end reduced diameter tube 10, the outer mold 4 and the inner reduced diameter body 32, 33 compress the end of the spiral tube 11 Processing is performed to form the diameter-reduced end 12 and the groove-shaped recess 13. At this time, since the boundary portion 11a adjacent to the reduced diameter end portion 12 is supported (shape maintained) by the inner same diameter body 31, the end reduced diameter tube 10 is not deformed or reduced in diameter. It becomes possible to manufacture appropriately. Further, since the inner die 3 and the outer die 4 are disposed inside and outside the end of the spiral tube 11 and the outer die 4 only needs to be advanced toward the inner die diameter reducing body 32, 33, the end diameter reducing tube It becomes possible to manufacture 10 efficiently.

  Further, since the outer mold 4 is configured by the plurality of outer mold parts 41, it is possible to facilitate a mechanism for moving the outer mold 4 back and forth. In addition, there is no need to repair or replace the entire outer mold 4 when damage or breakage occurs, and only the damaged outer part 41 needs to be repaired or replaced, reducing the time and cost required for repair and replacement. It is possible to Such an effect is similarly obtained in the inner-type same-diameter body 31 configured by a plurality of inner-type equal-diameter parts 311.

  In addition, since the diameter-reduced end portion 12 in which the groove-like concave portion 13 is formed can pass through the inner diameter body 31 by reducing the diameter of the inner diameter body 31, the spiral tube 11 can be formed into the inner shape 3 after processing. It can be easily removed from the Moreover, by pushing the spiral tube 11 out of the inner mold 3 with the pushing member 5 in a state where the diameter of the inner-type same diameter body 31 is reduced, it becomes possible to easily take out the spiral tube 11 from the inner mold 3 after processing. Furthermore, when the outer mold 4 retracts from the inner mold diameter reducing body 32, 33, that is, after the end of the spiral tube 11 is processed, the discharge mechanism 6 automatically reduces the diameter of the inner mold body 31 by the discharge mechanism 6. Then, since the pushing member 5 pushes the spiral tube 11 out of the inner mold 3, it is possible to efficiently manufacture the end diameter reducing tube 10.

  On the other hand, since a plurality of inner molds 3 and outer molds 4 having different diameters are detachable, it is possible to process the end of the spiral pipe 11 having different diameters with one manufacturing apparatus 1 and reduce the equipment cost. At the same time, the end reduced diameter tube 10 can be manufactured efficiently.

  Also, in a state where the spiral tube 11 is supported so that the axial center of the spiral tube 11 extends along the axial center of the inner die 3 (outer die 4), that is, the position and angle of the spiral tube 11 with respect to the inner die 3 are appropriate. In the state, since the end of the spiral tube 11 is processed, the end reduced diameter tube 10 can be properly manufactured.

  The embodiment of the present invention has been described above, but the specific configuration is not limited to the above embodiment, and even if there is a change in design or the like within the scope of the present invention, Included in the invention. For example, in the above embodiment, although the inner die 3 is configured by the inner die same diameter body 31 and the inner die reduced diameter bodies 32, 33 (or only the inner die reduced diameter body 32), all are integrated. Alternatively, the first inner reduced diameter body 32 and the second inner reduced diameter body 33 may be integrally formed to have a shape and a diameter corresponding to the spiral tube 11 to be processed. .

  Further, the step between the reduced diameter end portion 12 and the boundary portion 11a may be tapered so that the spiral tube 11 is not cut. Furthermore, although the inner-type same-diameter body 31 and the outer-type 4 are composed of four parts, they may be composed of more parts or fewer parts according to the diameter of the spiral tube 11 or the like. At this time, for example, in the case where the outer mold 4 is configured by eight outer mold parts 41, each outer mold part does not simultaneously advance and retract with respect to the inner diameter reducing bodies 32 and 33. 41 may be sequentially advanced (with a time difference).

  The present invention is applicable not only to air conditioning ducts, but also to exhaust pipes, drainage pipes, etc., and to pipes other than spiral pipes.

DESCRIPTION OF SYMBOLS 1 end part diameter reduction pipe manufacturing apparatus 21 base 23 processing board 24 pipe support 3 inner type 31 inner type same diameter body (inner type same diameter part)
311 inner diameter parts 32 first inner diameter reduction body (inner diameter reduction portion)
321 forming groove 322 guide groove 33 second inner diameter reducing body (inner diameter reducing portion)
331 Forming groove 332 Guide groove 4 Outer mold 41 Outer mold part 411 Forming punch 5 Push rod (Extruded member)
DESCRIPTION OF SYMBOLS 6 Discharge mechanism 60 Rubber ring 61 Control rod 62 Connection plate 63 Discharge cylinder 10 End diameter reduction pipe 11 Spiral pipe (pipe)
12 reduced diameter end 13 grooved recess

Claims (7)

An apparatus for producing an end reduced diameter tube, which reduces the diameter of the end of a cylindrical tube to produce an end reduced diameter tube,
A cylindrical inner die disposed within the end of the tube, and an annular outer die disposed around the outer periphery of the end of the tube;
The inner mold is formed with an inner mold same diameter part having substantially the same diameter as the inner diameter of the pipe, and a concave shape which is concentric with the inner mold same diameter part and smaller in diameter than the inner mold same diameter part and extends axially on the outer peripheral surface And an inner die reduced diameter portion provided with a groove;
The outer mold is provided with a forming punch which is movable forward and backward with respect to the inner diameter reducing part and which has a convex shape extending in the axial direction on the inner peripheral surface and which is fitted to the forming groove.
As the outer mold advances toward the inner mold reduced diameter portion, the diameter of the end of the pipe is reduced by the outer mold and the inner mold reduced diameter portion, and the axially extending groove-shaped recess is formed. Form,
An apparatus for manufacturing an end reduced diameter tube, characterized in that The outer mold is configured by arranging a plurality of fan-shaped outer mold parts in an annular shape.
An apparatus for manufacturing an end reduced diameter tube according to claim 1, wherein: The end of the pipe in which the groove-like concave portion is formed can pass through in a state where the diameter of the inner type same diameter portion is freely reduced and the diameter is reduced.
The manufacturing apparatus of the end reduced diameter pipe of any one of Claim 1 or 2 characterized by the above-mentioned. And a pushing member for pushing the end of the pipe from the inner mold in a state where the diameter of the inner mold same diameter portion is reduced.
The manufacturing apparatus of the end part diameter reducing tube of Claim 3 characterized by the above-mentioned. When the outer die retracts from the inner die reduced diameter portion side, the inner die same diameter portion is reduced in diameter, and a discharge mechanism for pushing out the pipe by the pushing member is provided.
The manufacturing apparatus of the end part diameter reducing tube of Claim 4 characterized by the above-mentioned. The plurality of inner molds having different outer diameters and the plurality of outer molds having different inner diameters are detachable.
The manufacturing apparatus of the end reduced diameter pipe of any one of Claim 1 to 5 characterized by the above-mentioned. A method of manufacturing an end reduced diameter tube using the manufacturing apparatus according to any one of claims 1 to 6,
The inner mold is disposed within the end of the tube, the outer mold is disposed around the outer periphery of the end of the tube, and the tube is extended such that the axial center of the tube extends along the axial center of the inner mold In the supported state, advance the outer mold toward the inner mold diameter reducing portion,
A method of manufacturing an end reduced diameter tube characterized by

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