JP6620721B2 - Pipe bending equipment - Google Patents

Description

  The present invention relates to a tube bending apparatus.

  2. Description of the Related Art A pipe bending apparatus that performs bending at one portion on the front side in the traveling direction while moving a metal pipe in its axial direction is used. In such a bending apparatus, the pipe to be processed is sandwiched between the bending mold and the clamping mold of the apparatus, and the bending mold and the clamping mold are rotated to form a bend. Further, a pipe used for an exhaust pipe of an internal combustion engine is subjected to a plurality of different bending processes on a single pipe. As a technique for performing such a bending process, a bending apparatus of Patent Document 1 has been proposed. That is, the bending device is mounted on the device base so that the entire bending head can reciprocate in two different directions, both of which intersect the device axis or the tube axis. The bending apparatus has a plurality of different bending dies and clamping dies on such a bending head. This allows the bending apparatus to perform a plurality of different bending processes without removing the tube from the apparatus.

JP 59-024532 A

  However, in the bending apparatus described in Patent Document 1, it is necessary to prepare a dedicated die that matches the shape of each bending for each type of bending process, and attach these to the bending apparatus. For this reason, as the number of types of bending increases, the bending apparatus becomes larger.

  The present invention has been made to solve such a problem, and can suppress an increase in the size of a pipe bending apparatus.

  A pipe bending apparatus according to the present invention includes a bending mold having a processing groove corresponding to an outer periphery of a pipe to be processed, a first clamping mold that is paired with the bending mold and sandwiches the pipe, and the bending mold. A pair of second clamp molds sandwiching the tube, and the bending mold in a state where the tube is sandwiched between the bending mold and the first clamp mold, or the bending mold and the second clamp mold. Is a tube bending apparatus that performs a plurality of bending operations on the tube by rotating about an axis perpendicular to a plane including the central axis of the tube, wherein the bending die is the tube A first groove corresponding to a half arc of the outer periphery of the tube and a second groove corresponding to an arc smaller than a half of the outer periphery of the tube, and the first clamp mold has a first groove corresponding to the first groove. 3 grooves and a fourth groove with a claw corresponding to the second groove, Clamp type are those having a fifth groove corresponding to the first groove, and a sixth groove that holds the tube which is then bent corresponding to the second groove, the.

  With such a configuration, a bending die and a first clamp die are used when bending the vicinity of the end of the tube. That is, the tube is held by the first groove of the bending mold and the third groove of the first clamp mold, the second groove of the bending mold, and the fourth groove with the claw of the first clamp mold, Hold the tube. Thereby, it is possible to perform the bending process in a state where the end portion and the vicinity of the end portion of the pipe are sufficiently held.

  Similarly, a bending die and a second clamp die are used when the second and subsequent bending processes are performed on the portion other than the end portion of the tube. That is, the tube is held by the first groove of the bending die and the fifth groove of the second clamp die, and the second groove of the bending die avoids interference with the bent portion of the tube, and the second clamping die. The sixth groove of the can be bent by avoiding interference with the bent portion of the tube and holding the bent portion of the tube.

  By this invention, the enlargement of the bending apparatus of a pipe | tube can be suppressed.

It is a schematic diagram which shows the structure of the bending apparatus 1 which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the bending process state of the bending apparatus 1 which concerns on Embodiment 1. FIG. 2 is a plan view of a bending die 20 according to Embodiment 1. FIG. 2 is a front view of a bending die 20 according to Embodiment 1. FIG. 2 is a cross-sectional view of a bending die 20 according to Embodiment 1. FIG. 3 is a perspective view of a first clamp mold 40 according to Embodiment 1. FIG. 3 is a perspective view of a part of the tube 100 and the bending die 20 according to Embodiment 1. FIG. 2 is a perspective view of the tube 100 and the first clamp die 40 according to Embodiment 1. FIG. 4 is a cross-sectional view showing a clamped state of the tube 100 by the bending die 20 and the first clamp die 40 according to Embodiment 1. FIG. 3 is a perspective view of a second clamp mold 50 according to Embodiment 1. FIG. 3 is a perspective view of a part of the tube 100 and the bending die 20 according to Embodiment 1. FIG. 4 is a perspective view of the pipe 100 and the second clamp die 50 according to Embodiment 1. FIG. 4 is a cross-sectional view showing a clamped state of the tube 100 by the bending die 20 and the second clamp die 50 according to Embodiment 1. FIG. 1 is a perspective view of a bending die 20 according to Embodiment 1. FIG. 3 is a perspective view of a second clamp mold 50 according to Embodiment 1. FIG. 6 is a schematic diagram showing a clamped state according to Embodiment 2. FIG.

Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram illustrating a configuration of a bending apparatus 1 according to the first embodiment. The pipe bending apparatus 1 performs a bending process at a portion on the front side in the traveling direction while moving a metal pipe in the axial direction thereof. The bending apparatus 1 includes a shaft pressing die 11, a core metal 12, a pressure die 13, a wrinkle pressing die 14, a bending die 20, and a clamp die 30. The bending apparatus 1 is provided with a metal pipe 100 to be processed.

  The shaft pushing die 11 is advanced and retracted along the direction of arrow A by a power source (not shown). When bending the tube 100, the axial push die 11 advances in the direction of arrow A and pushes the tube 100. The direction of the arrow A coincides with the direction of the axis 101 of the tube 100.

  The core metal 12 is inserted into the tube 100 and suppresses buckling deformation of the tube 100 during bending. The cored bar 12 is a cylindrical metal, and the outer diameter of the cored bar 12 and the inner diameter of the tube 100 coincide with each other with a predetermined clearance. Therefore, the cored bar 12 and the tube 100 are engaged so as not to rattle greatly. The cored bar 12 is locked to the bending device 1.

  The pressure die 13 advances and retreats along the direction of arrow A while pressing the outer periphery of the tube 100. When bending the tube 100, the pressure die 13 moves in the direction of arrow A in synchronization with the axial push die 11 while pressing the outer periphery of the tube 100.

  The wrinkle pressing die 14 is an outer peripheral portion of the tube 100 in which the core metal 12 is inserted, and presses a portion adjacent to a bending die 20 described later. When bending the tube 100, the tube 100 moves in the plus direction of the arrow A at a predetermined speed. Further, the wrinkle pressing die 14 is fixed to the bending device 1. For this reason, while the tube 100 is being bent, the wrinkle pressing die 14 and the tube 100 are rubbed.

  The bending die 20 has a groove corresponding to the outer peripheral portion of the tube 100, and is a mold for bending the tube 100 by placing the tube 100 along the bending die 20. The bending die 20 rotates about an axis C perpendicular to a plane parallel to the central axis of the tube 100. When bending the tube 100, the bending die 20 rotates in the direction of arrow B about the axis C.

  The clamp die 30 sandwiches a part of the outer peripheral portion of the tube 100 together with the bending die 20. The clamp mold 30 rotates about the axis C. When bending the tube 100, the clamp die 30 rotates in the direction of the arrow B around the axis C in synchronization with the bending die 20 while holding the tube 100 together with the bending die 20.

  In summary, when bending the pipe 100 using the bending apparatus 1, the following procedure is performed. First, the bending apparatus 1 is set to an initial state. That is, as shown in FIG. 1, the pressure die 13, the bending die 20, and the clamp die 30 are set at positions along the axis 101 of the tube 100. Next, the core metal 12 is inserted into the tube 100 to install the shaft pressing die 11, and the tube 100 is sandwiched between the pressure die 13, the wrinkle holding die 14, the bending die 20, and the clamp die 30.

  Subsequently, bending is performed as shown in FIG. FIG. 2 is a schematic diagram showing a bending state of the bending apparatus 1 according to the first embodiment. In the bending apparatus 1, the axial push die 11 advances in the direction of arrow A, and the pressure die 13 advances in the direction of arrow A while holding the tube 100. Further, as the shaft pressing die 11 and the pressure die 13 advance in the plus direction of the arrow A, the bending die 20 and the clamp die 30 rotate in the direction of the arrow B around the axis C.

  When the bending device 1 performs such an operation, the tube 100 is bent into a shape along the bending die 20 while being pressed by the pressure die 13 and the clamp die 30.

  Although details will be described later, in the first embodiment, the clamp mold 30 includes a first clamp mold 40 and a second clamp mold 50. The first clamp die 40 is used when the vicinity of the end of the tube 100 is bent. Further, the second clamp die 50 is used when bending other than the vicinity of the end of the tube 100.

  Next, details of the bending die 20 will be described with reference to FIGS. 3 and 4. FIG. 3 is a plan view of the bending die 20 according to the first embodiment. The bending die 20 has a hole 21, a bending groove 22, a first groove 23, and a second groove 24. The hole 21 engages with a shaft C provided in the bending apparatus 1. When the bending die 20 is mounted on the bending device 1 at the axis C, the bending die 20 is rotatable in the bending device 1. The bending groove 22 has a shape corresponding to a half circular arc on the outer periphery of the tube 100, and the groove is formed on the circular arc around the hole 21. The bending groove 22 is a semicircular groove and is formed in a range from the end 22a to the end 22b.

  The first groove 23 is a groove that is in contact with the end 22 a of the bending groove 22 and corresponds to a half arc of the outer periphery of the tube 100, similarly to the bending groove 22. The first groove 23 extends from the end portion 22a so as to contact the bending groove 22. In FIG. 3, the first groove extends in the range of the length 23L.

  The second groove 24 is a groove extending from the end 23 a of the first groove 23 in the same direction as the first groove 23. The second groove 24 has a shape corresponding to an arc smaller than half of the outer periphery of the tube 100.

  FIG. 4 is a front view of the bending die 20 according to the first embodiment. As described above, the bending groove 22 is a semicircular groove. Further, the bending groove 22 and the first groove 23 are connected without a step. Similarly, the first groove 23 and the second groove 24 are connected without any step. The second groove 24 has a shape corresponding to an arc smaller than half of the outer periphery of the tube 100, and the bottom of the groove has an arc shape common to the bending groove 22 and the first groove 23. However, the second groove 24 has a shape that is wider than the arc corresponding to the outer periphery of the tube 100 as it goes to the edge.

  Here, the details of the second groove 24 will be described. FIG. 5 is a cross-sectional view of the bending groove 20 in the second groove 24. FIG. 5 shows a cross section V in FIG. Moreover, in FIG. 5, the outer periphery shape of the pipe | tube 100 is shown with the dashed-two dotted line. The 2nd groove | channel 24 is exhibiting the shape which supports the pipe | tube 100 in the range of the position 24a to the position 24b. At this time, an angle E1 formed by a straight line connecting the center 100a of the tube 100 and the position 24a, a line 25 parallel to the hole 21 of the bending die 20, and a straight line connecting the center 100a of the tube 100 and the position 24b. The angles E2 formed by the holes 21 of the bending mold 20 and the lines 25 parallel to each other are preferably 25 degrees or more and 65 degrees or less. In the first embodiment, the angle E1 is 30 degrees and the angle E2 is 45 degrees. Further, from the position 24a to the edge of the groove, the tangent line of the second groove 24 at the position 24a is extended straight. Similarly, from the position 24b to the edge of the groove, the tangent line of the second groove 24 at the position 24b is extended straight. Thus, the second groove 24 forms a space 24c and a space 24d while supporting a part of the arc of the tube 100. Further, as shown in FIG. 4, the second groove 24 is formed without a step difference from the first groove 23.

  Next, the details of the first clamp die 40 will be described with reference to FIG. FIG. 6 is a perspective view of the first clamp die 40 according to the first embodiment. The first clamp mold 40 has a claw 41, a claw 42, a third groove 43, and a fourth groove 44. The claw 41 and the claw 42 protrude from the surface of the first clamp mold 40 facing the bending mold 20 and are formed along the edge of the fourth groove 44. The claw 41 and the claw 42 have shapes corresponding to the space 24c and the space 24d of the bending die 20, respectively, and the claw 41 is a space when the bending die 20 and the first clamp die 40 sandwich the tube 100. The claw 42 is fitted into the space 24d. The third groove 43 has a shape corresponding to a half arc of the tube 100. The third groove 43 has a shape that holds a half arc of the outer periphery of the tube 100. The length of the third groove 43 is 23L. Similar to the third groove 43, the fourth groove 44 has a shape that holds a half arc of the outer periphery of the tube 100 and is connected to the claw 41 and the claw 42 without a step.

  Next, the case where the vicinity of the end of the tube 100 is bent will be described with reference to FIGS. When bending the vicinity of the end of the tube 100, it is necessary to sufficiently maintain the tip portion rather than the bent portion, that is, the range from the bent portion to the end of the tube 100. If the holding is not sufficient, the end of the tube 100 may be unintentionally deformed during bending. In the first embodiment, when the vicinity of the end of the tube 100 is bent, the first clamp die 40 is used.

  Here, the bending die 20 and the first clamp die 40 when bending the vicinity of the end portion of the tube 100 will be described with reference to FIGS. 7 and 8. And the first clamp mold 40 will be described separately. FIG. 7 is a perspective view in which portions of the first groove 23 and the second groove 24 that are part of the tube 100 and the bending die 20 according to the first embodiment are extracted. The bending apparatus 1 rotates the bending die 20 around the axis C in the direction of arrow B while pushing the tube 100 in the direction of arrow A. The bending die 20 holds the end portion of the tube 100 and the vicinity thereof together with a first clamp die 40 (not shown). Further, the bending die 20 holds the range of the arc of the half of the outer periphery of the tube 100 in the range of the first groove 23 (length 23L). On the other hand, in the bending mold 20, the range of the second groove 24 holds an arc range smaller than half of the outer periphery of the tube 100.

  Next, the state of the tube 100 and the first clamp die 40 will be described with reference to FIG. FIG. 8 is a perspective view of the tube 100 and the first clamp die 40 according to the first embodiment. The first clamp die 40 sandwiches the vicinity of the end of the tube 100 together with the bending die 20, and rotates in the direction of arrow B about the axis C.

  In a state where the tube 100 is sandwiched between the bending die 20 and the first clamp die 40, the first groove 23 (length 23L) of the bending die 20 and the third groove 43 (length 23L) of the first clamp die 40 are included. ). Therefore, in the range sandwiched between the first groove 23 of the bending die 20 and the third groove 43 of the first clamp die 40, the tube 100 is sandwiched on the entire outer periphery or the entire arc.

  Similarly, the second groove 24 of the bending die 20 and the fourth groove of the first clamp die 40 are in a corresponding relationship. With reference to FIG. 9, the details of the portion sandwiched between the second groove 24 and the fourth groove 44 will be described. FIG. 9 is a cross-sectional view showing a clamped state of the tube 100 by the bending die 20 and the first clamp die 40 according to the first embodiment. FIG. 9 shows a cross-sectional view taken along a cross-section IX in FIG. As shown in FIG. 9, the tube 100 is sandwiched between the second groove 24 of the bending die 20 and the fourth groove 44 of the first clamp die 40. The second groove 24 holds a range from the position 24a to the position 24b, which is a range smaller than half of the arc of the tube 100. On the other hand, in the first clamp mold 40, the fourth groove 44 holds half of the arc of the tube 100, and the claw 41 and the claw 42 are fitted in the space 24 c and the space 24 d to hold the tube 100.

  As described above, the first groove 23 included in the bending die 20 and the third groove 43 included in the first clamp die 40 are paired to hold the tube 100, and the second groove 24 included in the bending die 20, The nail | claw 41 and the 4th groove | channel 44 with the nail | claw 42 which 1 clamp type | mold 40 has become a pair, and hold | maintains the pipe | tube 100. FIG. As a result, bending can be performed with the end of the tube 100 and the vicinity of the end sufficiently held.

  Next, the case of bending other than the vicinity of the end of the tube 100 will be described. The first embodiment is an example of a case where bending is performed on portions other than the vicinity of the end of the tube 100 and the tube 100 has already been bent once or more. That is, the tube 100 has a bent portion. In such a case, the bending apparatus 1 needs to hold the tube 100 so as to have a desired shape during bending while avoiding interference with the bent portion. In such a case, in the first embodiment, bending is performed using the second clamp die 50.

  First, the details of the second clamp die 50 will be described with reference to FIG. FIG. 10 is a perspective view of the second clamp die 50 according to the first embodiment. The second clamp mold 50 has a fifth groove 51, a sixth groove 52, and a seventh groove 53. The fifth groove 51 has a shape corresponding to a half arc on the outer periphery of the tube 100. That is, the fifth groove 51 has a shape that holds a half arc of the outer periphery of the tube 100. The fifth groove 51 is formed so as to correspond to the first groove 23 of the bending die 20. The fifth groove 51 has a length of 23L. That is, when the tube 100 is sandwiched between the bending die 20 and the second clamp die 50, the first groove 23 and the fifth groove 51 hold the outer periphery of the tube 100 in the range of the length 23L.

  The sixth groove 52 avoids interference between the bent portion of the tube 100 and the second clamp mold 50 and has a shape that holds the tube 100 during bending. Similar to the sixth groove 52, the seventh groove 53 has a shape that holds the pipe 100 during bending while avoiding interference between the bent portion of the pipe 100 and the second clamp die 50. Here, in the step of using the second clamp die 50, the case where the tube 100 is bent using the sixth groove 52 and the case where the tube 100 is bent using the seventh groove 53 are different steps. . That is, the bending apparatus 1 can perform two or more kinds of bending processes by using the second clamp die 50.

  Next, the bending die 20 and the second clamp die 50 when bending a portion other than the vicinity of the end portion of the tube 100 will be described with reference to FIGS. 11 and 12. For convenience of explanation, the bending die 20 and the second clamp die 50 for the tube 100 will be described separately. FIG. 11 is a perspective view of the bending die 20 according to the first embodiment. The bending apparatus 1 rotates the bending die 20 in the direction of arrow B while pushing the tube 100 in the direction of arrow A. The bending die 20 holds the straight portion 102 of the tube 100 together with a second clamp die 50 (not shown). In the range of the first groove 23, the bending die 20 maintains a range of an arc that is a half of the outer periphery of the tube 100.

  Next, the state of the tube 100 and the second clamp die 50 will be described with reference to FIG. FIG. 12 is a perspective view of the tube 100 and the second clamp die 50 according to the first embodiment. The second clamp die 50 sandwiches the straight portion 102 of the tube 100 together with the bending die 20 and rotates in the direction of arrow B about the axis C. Further, the second clamp die 50 holds the bent portion 103 when bending.

  Thus, in a state where the tube 100 is sandwiched between the bending mold 20 and the second clamp mold 50, the first groove 23 of the bending mold 20 and the fifth groove 51 of the second clamp mold 50 are in a corresponding relationship. is there. Therefore, in the range (length 23L) sandwiched between the first groove 23 of the bending die 20 and the fifth groove 51 of the second clamp die 50, the tube 100 is sandwiched on the entire outer periphery or the entire arc. Will be.

  Next, the correspondence relationship between the second groove 24 of the bending die 20 and the sixth groove 52 of the second clamp die 50 will be described with reference to FIG. FIG. 13 is a cross-sectional view showing a clamped state of the tube 100 by the bending die 20 and the second clamp die 50 according to the first embodiment. FIG. 13 shows a cross-sectional view corresponding to the cross section IX of FIG. In FIG. 13, the tube 100 is indicated by a two-dot chain line. The second groove 24 of the bending die 20 holds the tube 100 in the range from the position 24a to the position 24b. Further, the bending die 20 avoids interference with the bent portion 103 of the tube 100 by the space 24c. On the other hand, the 6th groove | channel 52 which the 2nd clamp type | mold 50 has avoids interference with the bending part 103 of the pipe | tube 100, and hold | maintains the pipe | tube 100 in the case of a bending process.

  Next, with reference to FIGS. 14 and 15, a case where bending is performed except for the vicinity of the end portion of the tube 100 and the bending is performed using the seventh groove 53 of the second clamp die 50 will be described. To do. For convenience of explanation, the bending die 20 and the second clamp die 50 for the tube 100 will be described separately. It should be noted that here, portions overlapping with those described with reference to FIGS. 11 and 12 are omitted as appropriate.

  FIG. 14 is a perspective view of the bending die 20 according to the first embodiment. In this example, the tube 100 has a bent portion 104. The bending die 20 holds the straight portion 102 of the tube 100 together with a second clamp die 50 (not shown). Further, the bending die 20 avoids interference with the bent portion 103 of the tube 100 due to the space 24 d in the second groove 24.

  Next, the state of the tube 100 and the second clamp die 50 will be described with reference to FIG. FIG. 15 is a perspective view of the tube 100 and the second clamp die 50 according to the first embodiment. The second clamp die 50 sandwiches the straight portion 102 of the tube 100 together with the bending die 20. The seventh groove 53 of the second clamp mold 50 avoids interference with the bent portion 103 and holds the bent portion 103 when bending.

  With such a configuration, the bending die 20 and the second clamp die 50 are used when the second or subsequent bending process is performed on the portion other than the end portion of the tube 100. That is, the first groove 23 included in the bending die 20 and the fifth groove 51 included in the second clamp die 50 are paired to hold the tube 100, and the second groove 24 included in the bending die 20 is bent from the tube 100. The sixth groove 52 or the seventh groove 53 of the second clamp mold 50 holds the bent portion 103 or the bent portion 104 of the tube 100 while avoiding interference with the portion 103 or the bent portion 103, and bending is performed. be able to.

  As described above, the tube bending apparatus 1 includes the bending die 20, the first clamp die 40, and the second clamp die 50, so that a plurality of bending processes can be performed. Therefore, the enlargement of the pipe bending apparatus can be suppressed.

Embodiment 2
Next, Embodiment 2 will be described with reference to FIG. Since the configuration of the bending apparatus 1 and the configuration of the bending die 20 are the same in the first embodiment and the second embodiment, description thereof will be omitted. FIG. 16 is a schematic diagram illustrating a clamped state according to the second embodiment. In the bending apparatus 1 according to the second embodiment, the first clamp die 40 is not used when bending the vicinity of the end of the tube 100. Instead of the first clamp mold 40, a second clamp mold 50 with a plug 60 and a plug 70 attached thereto is used. The plug 60 is a member that is attached to the sixth groove 52 of the second clamp mold 50, fills the gap between the pipe 100 and the sixth groove 52, and holds the pipe 100. Similarly, the plug 70 is a member that is attached to the seventh groove 53 of the second clamp mold 50, fills the gap between the pipe 100 and the seventh groove 53, and holds the pipe 100. The plug 60 and the plug 70 are made of metal so that the tube 100 can be sufficiently held.

  By attaching the plug 60 and the plug 70 to the second clamp mold 50, the second clamp mold 50 bends the vicinity of the end of the tube 100 in the same manner as the first clamp mold 40 in the first embodiment. Is possible. Therefore, the plug 60 has a claw 61 as a portion corresponding to the claw 41 of the first clamp mold 40 according to the first embodiment. Similarly, the plug 70 has a claw 71 as a portion corresponding to the claw 42 of the first clamp die 40 according to the first embodiment.

  By adopting such a configuration, in the second embodiment, the bending mold 20, the second clamp mold 50, and the plugs 60 to 70 can be used to perform bending work in the vicinity of the end of the pipe or other than the vicinity of the end of the pipe. Can be bent. That is, the configuration according to the second embodiment can suppress the increase in the size of the pipe bending apparatus.

  Note that the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. For example, the grooves of the second clamp mold 50 shown in the first embodiment and the second embodiment are merely examples, and the shape of the grooves and the number of grooves can naturally be changed.

DESCRIPTION OF SYMBOLS 1 Bending apparatus 20 Bending die 22 Bending groove 23 First groove 24 Second groove 30 Clamp die 40 First clamp die 41, 42 Claw 43 Third groove 44 Fourth groove 50 Second clamp die 51 Fifth groove 52 Sixth groove 53 Seventh groove 60, 70 Plug 100 Pipe

Claims (1)

A bending die having a processing groove corresponding to the outer periphery of the pipe to be processed;
A first clamp mold paired with the bending mold and sandwiching the tube;
A second clamp mold that is paired with the bending mold and sandwiches the tube;
In a state where the tube is sandwiched between the bending die and the first clamping die, or the bending die and the second clamping die, the bending die has an axis perpendicular to a plane including the central axis of the tube. A pipe bending apparatus that performs a plurality of bending processes on the pipe by rotating to the center,
The bending mold has a first groove corresponding to a half arc of the outer periphery of the tube and a second groove corresponding to an arc smaller than a half of the outer periphery of the tube;
The first clamp mold has a third groove corresponding to the first groove, and a fourth groove with a claw corresponding to the second groove,
The second clamp mold has a fifth groove corresponding to the first groove, and a sixth groove for holding the pipe bent to correspond to the second groove.
Pipe bending equipment.

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