JP2007283359A - Mandrel for bending work and bending device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mandrel for bending work which can supply an appropriate amount of a lubricating oil into a pipe. <P>SOLUTION: The mandrel for bending work has a discharge port 56 opened inside the pipe 3 and connected to a supply channel 70 into which a lubricating oil is supplied, and a cut-off valve 72 in the supply channel 70 in the vicinity of the discharge port 56. The cut-off valve 72 has an energizing member 58 for energizing a valve body 60 in an opening direction of the valve for cutting off the stream of the lubricating oil from the supply channel 70 to the discharge port 56. Moreover, the mandrel 40 for bending work has a long rod member 42, and a plug 44 attached to the tip of the rod member 42. The plug 44 has the cut-off valve 72. Furthermore, the cut-off valve 72 has the spherical valve body 60, movably houses the valve body 60 in a housing hole 50 provided in the plug 44, and the valve body 60 is energized by the energizing member 58 toward a tapered valve seat 64 formed in a valve seat member 62 screwed in the plug 44. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bending mandrel that is inserted into a bending portion of a pipe to be bent to prevent deformation of the pipe, and a bending apparatus using the bending mandrel.

Conventionally, a bending mandrel is inserted into a bending portion of a pipe to be bent to prevent deformation of the pipe. At that time, as disclosed in Patent Document 1, a nozzle that discharges lubricating oil is formed on a mandrel, and the pump and the nozzle are connected by a lubricating oil supply channel. Then, the pump is driven to supply lubricating oil between the mandrel and the inner periphery of the pipe so as to suppress generation of wrinkles and vibration during bending.
JP-A-7-39942

  However, in such conventional ones, in many cases, a bending mandrel is inserted into a long pipe, and the bending mandrel tip side is connected via a supply channel connecting the pump and the nozzle. The lubricating oil is discharged from the nozzle. For this reason, the lubricating oil remaining in the supply flow path is long even if the supply flow path is long and the amount of lubricating oil in the supply flow path increases and the pump is stopped and the supply of the lubricating oil is stopped. Will flow out of the nozzle.

  Therefore, a large amount of lubricating oil flows out into the pipe, which wastes lubricating oil and contaminates the inside of the pipe with lubricating oil. Therefore, there is a problem that the pipe must be cleaned after bending. It was. In addition, since the lubricating oil that has flowed out of the pipe contaminates the bending apparatus, there is also a problem that the bending apparatus must be cleaned.

  An object of the present invention is to provide a bending mandrel capable of supplying an appropriate amount of lubricating oil into a pipe and a bending apparatus using the bending mandrel.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
In a bending mandrel that is inserted into a bending portion of a pipe to be bent and prevents deformation of the pipe,
A discharge port connected to a supply flow path to which lubricating oil is supplied is formed in the pipe, and a shutoff valve is interposed in the supply flow path near the discharge port, and the shutoff valve is connected to the supply flow path. The bending mandrel includes a biasing member that biases the valve body in a valve closing direction that blocks the flow of the lubricating oil from the passage to the discharge port. In that case, it is provided with a long rod member and a plug attached to the tip of the lot member, the shut-off valve is provided on the plug, and the shut-off valve has a spherical valve body and the plug The valve body is movably stored in a storage hole provided in the valve, and the valve body is attached to the tapered valve seat formed on the valve seat member screwed into the plug by the biasing member. It is good also as the structure which was energetic.

In a bending apparatus for bending a pipe by inserting a bending mandrel into a bending portion of the pipe to be bent,
The bending mandrel is connected to a supply flow path to which lubricating oil is supplied, has a discharge port formed in the pipe, and is interrupted by the supply flow channel in the vicinity of the discharge port. Provided with a valve, the shut-off valve comprises a biasing member that biases the valve body in a valve closing direction that shuts off the flow of the lubricating oil from the supply flow path to the discharge port,
In addition, a bending apparatus characterized in that an electromagnetic on-off valve is interposed in a supply flow channel upstream of the shut-off valve, and a control means for controlling the electromagnetic on-off valve is provided.

  The bending mandrel of the present invention has an effect that an appropriate amount of lubricating oil can be supplied into the pipe because the shutoff valve blocks outflow of the lubricating oil. In addition, since the shutoff valve blocks outflow of the lubricating oil in the bending apparatus using it, an appropriate amount of lubricating oil can be supplied into the pipe, and the control means controls the electromagnetic on-off valve to appropriately There is an effect that an appropriate amount of lubricating oil can be supplied at a given time.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
As shown in FIGS. 1 and 2, reference numeral 1 denotes an apparatus main body of a bending apparatus, and a bending head 2 is disposed on the front side of the apparatus main body 1. The bending head 2 includes a bending die 4 formed according to the bending radius of the long pipe 3, and a groove 6 corresponding to the diameter of the pipe 3 is formed on the outer periphery of the bending die 4. The bending die 4 is rotatably supported together with the bending arm 8, and the bending arm 8 is attached so as to be driven to rotate by a bending arm cylinder 10.

  A clamping mold 12 is movably supported on the bending arm 8 so as to face the bending mold 4, and the clamping mold 12 is driven by a clamping cylinder 14 to connect the pipe 3 to the bending mold 4, the clamping mold 12, and the clamping mold 12. It is comprised so that it can clamp by.

  Further, a wiper mold 16 is disposed close to the bending mold 4, and a pressure mold 18 is movably supported facing the wiper mold 16. The pressure die 18 is driven by a pressure die cylinder 22 and is applied to the pipe 3 so as to receive a reaction force during bending.

  A set of rails 26, 28 are laid along the axial direction of the pipe 3 on the apparatus main body 1, and a carriage 30 is engaged with the rails 26, 28 so as to be movable along the rails 26, 28. The carriage motor 32 (see FIG. 3) is configured to be moved along the rails 26 and 28.

  A chuck 34 for gripping the other end of the pipe 3 is mounted on the carriage 30. Further, the chuck 34 is rotated by a twist motor 36 so that the pipe 3 is moved in the circumferential direction as indicated by an arrow in FIG. It is configured so that it can be twisted.

  On the other hand, a support member 38 is erected on the rear side of the apparatus main body 1, and a bending mandrel 40 disposed coaxially with the pipe 3 is supported on the support member 38. The distal end of the bending mandrel 40 is inserted into the pipe 3 from the other end of the pipe 3, and the distal end of the bending mandrel 40 extends to a position corresponding to the bending die 4.

  The bending mandrel 40 includes a long rod member 42 attached to the support member 38 and a plug 44 attached to the tip of the rod member 42. The plug 44 is disposed at a position corresponding to the bending die 4, and the tip of the plug 44 is formed in a taper shape according to the bending shape of the pipe 3.

  The rod member 42 can be inserted into the pipe 3 and is formed in a hollow shape, and is provided with a supply hole 46 along the axial direction. The plug 44 is formed with a screw hole 48 whose tip is screwed into the rod member 42, and an accommodation hole 50 is formed in the axial direction so as to be connected to the screw hole 48.

  A bottomed hole 52 is formed along the axial direction so as to be connected to the storage hole 50, and a plurality of communication holes 54 are formed from the bottomed hole 52 in the radial direction of the plug 44. Each communication hole 54 communicates with each discharge port 56 formed on the outer periphery of the plug 44.

  A biasing member 58 using a coil spring is inserted into the storage hole 50 and a spherical valve body 60 is inserted. Further, a valve seat member 62 is screwed into the screw hole 48 of the plug 44, and a valve seat 64 on which the valve body 60 can be seated is formed in the valve seat member 62. In the present embodiment, the valve seat 64 is formed in a tapered shape that increases in diameter toward the valve body 60, and a small-diameter hole 66 that is connected to the valve seat 64 toward the screw hole 48 is formed. Further, a connection hole 68 is formed so as to be connected to the small diameter hole 66, and the connection hole 68 is connected to the supply hole 46 of the rod member 42 screwed into the screw hole 48.

  In this embodiment, the supply flow path 70 is comprised by the supply hole 46, the connection hole 68, the small diameter hole 66, the storage hole 50, the bottomed hole 52, and the communicating hole 54, and the urging member 58, the valve body 60, and the valve A shutoff valve 72 is configured by the seat member 62. The shut-off valve 72 is disposed in the vicinity of the discharge port 56 so that the flow path length to the discharge port 56 is shortened. By disposing the shutoff valve 72 in the plug 44 as in the present embodiment, it can be easily disposed in the vicinity of the discharge port 56.

  Further, as shown in FIG. 4A, the supply flow path 70 is further connected to a pump 74, and an electromagnetic opening / closing valve 76 is interposed in the supply flow path 70 upstream of the shutoff valve 72. ing. The pump 74 pressurizes the lubricating oil in the tank 78 and supplies it to the supply flow path 70. As shown in FIG. 4B, the supply flow path 70 may be connected to a lubricating oil supply source 80 instead of the pump 74. The lubricating oil supply source 80 may supply lubricating oil as oil mist.

  As shown in FIG. 5, the driving of the bending arm cylinder 10 is controlled through a bending arm solenoid valve 110, and the driving of the clamping mold cylinder 14 is controlled through a clamping mold solenoid valve 112, and the pressure is controlled. The driving of the mold cylinder 22 is controlled via the pressure mold electromagnetic valve 114. A bending arm rotation angle detection sensor 116 that detects the rotation angle of the bending arm 8 is provided, and a carriage movement amount detection sensor 118 that detects the movement amount of the carriage 30 is provided.

  The carriage motor 32, the twist motor 36, the electromagnetic on-off valve 76, the bending arm electromagnetic valve 110, the clamping type electromagnetic valve 112, the pressure type electromagnetic valve 114, the bending arm rotation angle detection sensor 116, and the carriage movement amount detection sensor 118 are: The electronic control circuit 100 is configured with a well-known CPU 102, ROM 104, and RAM 106 as the center of a logical operation circuit, and is connected to an input / output circuit 108 that performs input / output with the outside via a common bus 110. It is connected.

  The CPU 102 inputs detection signals from the bending arm rotation angle detection sensor 116 and the carriage movement amount detection sensor 118 via the input / output circuit 108, and inputs data based on data in the ROM 104 and RAM 106 and a control program stored in advance. Signals are output to the carriage motor 32, the twist motor 36, the electromagnetic open / close valve 76, the bending arm electromagnetic valve 110, the clamping electromagnetic valve 112, and the pressure electromagnetic valve 114 via the output circuit 108.

Next, processing performed in the electronic control circuit 100 described above will be described with reference to the flowcharts of FIGS.
First, the pipe 3 having a predetermined length is passed through the plug 44 and the rod member 42, the end of the pipe 3 is gripped by the chuck 34, and the bending process control process shown in FIG. 6 is executed. In the bending control process, it is determined whether or not lubricating oil is to be discharged (step 200). Whether or not to discharge is preset, and discharge control processing (step 300) is executed when lubricating oil is discharged.

  In the discharge control process, as shown in FIG. 7, a valve opening signal is output to the electromagnetic on-off valve 76 via the input / output circuit 108 (step 310). Next, it is determined whether or not a predetermined time has elapsed (step 320). When the predetermined time has not elapsed, the valve open state is maintained, and when the predetermined time has elapsed, the electromagnetic on-off valve 76 is maintained. Is closed (step 330).

  When the electromagnetic on-off valve 76 is opened, lubricating oil is supplied from the pump 74 to the supply flow path 70, and the lubricating oil is supplied to the supply hole 46, the connection hole 68, and the small diameter hole 66. The oil pressure of the lubricating oil supplied to the small diameter hole 66 acts in the valve opening direction in which the valve body 60 is separated from the valve seat 64 via the valve seat 64.

  The urging force of the urging member 58 is set to be weaker than the acting force in the valve opening direction due to the hydraulic pressure of the lubricating oil supplied by the pump 74. When the acting force in the valve opening direction acts on the valve body 60, the valve body. 60 is separated from the valve seat 64 and the shut-off valve 72 is opened.

  Thereby, the lubricating oil passes through the storage hole 50, the bottomed hole 52, and the communication hole 54 and is discharged from the discharge ports 56 to the inside of the pipe 3. When a certain time elapses, the electromagnetic on-off valve 76 is closed and the supply of the lubricating oil to the supply flow path 70 is stopped. As a result, the valve body 60 no longer acts in the valve opening direction due to the oil pressure of the lubricating oil, and the valve body 60 is seated on the valve seat 64 by the biasing force of the biasing member 58.

  Therefore, the shut-off valve 72 is closed and the lubricating oil remaining in the supply hole 46 and the like is prevented from flowing out from the discharge port 56, and the lubricating oil remains in the supply hole 46 as it is. Therefore, the lubricating oil corresponding to the valve opening time of the electromagnetic on-off valve 76 is discharged from each discharge port 56, and the amount of lubricating oil discharged into the pipe 3 can be adjusted by the length of the valve opening time.

  Next, when the discharge control process is completed, or when it is determined by the process of step 200 that the lubricating oil is not discharged, the carriage motor 32 is driven to move the carriage 30 along the rails 26 and 28 (step 205). . The movement amount of the carriage 30 is detected by a carriage movement amount detection sensor 118, and the carriage 30 is moved according to the length of the pipe 3, and the bending portion of the pipe 3 is mounted in the groove 6 of the bending die 4. At that time, the lubricating oil discharged into the pipe 3 is spread on the inner peripheral surface of the pipe 3 by the plug 44. Further, the electromagnetic on / off valve 76 may be controlled according to the amount of movement of the carriage 30 to discharge the lubricating oil to the inner periphery of the pipe 3 at the bending position.

  Subsequently, it is determined whether or not the lubricating oil is to be discharged (step 210), and whether or not to discharge is similarly set in advance. When the lubricating oil is discharged, the above-described discharge control process (step 300) is performed. ). When the discharge control process is completed, or if it is determined in step 210 that the lubricant oil is not discharged, the twist motor 36 is driven to rotate the chuck 34 around the axial direction of the pipe 3 by a predetermined angle. When the pipe 3 is bent a plurality of times, if the bending direction of the bending process is different, the pipe 3 is twisted by a predetermined angle in accordance with the bending direction.

  Next, it is determined again whether or not the lubricating oil is to be discharged (step 220). When the lubricating oil is discharged, the above-described discharge control process (step 300) is executed. When the discharge control process is completed, or when it is determined in step 220 that the lubricant is not discharged, the clamping cylinder 14 is driven via the clamping solenoid valve 112 to move the clamping mold 12 and bend. The pipe 3 is gripped by the mold 4 and the clamping mold 12. Further, the pressure mold cylinder 22 is driven via the pressure mold electromagnetic valve 114 to move the pressure mold 18, and the pipe 3 is sandwiched between the wiper mold 16 and the pressure mold 18 (step 225). In addition, after moving the clamping die 12, you may make it move the pressure die 18 after discharging lubricating oil.

  It is determined again whether or not the lubricating oil is to be discharged (step 230). When the lubricating oil is discharged, the above-described discharge control process (step 300) is executed. When the discharge control process is completed, or when it is determined that the lubricating oil is not discharged by the process of step 230, the bending arm cylinder 10 is driven via the bending arm solenoid valve 110, and the bending mold 4 is bent. The arm 8 is rotated to revolve the clamping die 12 around the bending die 4 to perform bending (step 235). The rotation angle of the bending arm 8 is detected by the bending arm rotation angle detection sensor 116, and the bending arm 8 is rotated at a preset angle to perform bending to a predetermined angle. The lubricating oil may be discharged as the bending arm 8 rotates.

  Subsequently, it is determined whether or not the lubricating oil is to be discharged (step 240). When the lubricating oil is discharged, the above-described discharge control process (step 300) is executed. When the discharge control process is completed, or if it is determined in step 240 that the lubricant is not discharged, the clamping cylinder 14 is driven to release the clamping by the clamping mold 12 and the pressure mold cylinder 22 is driven. Thus, the clamping by the pressure die 18 is released.

  Further, it is determined whether or not to discharge the lubricating oil (step 250), and when the lubricating oil is discharged, the above-described discharge control process (step 300) is executed. When the discharge control process is completed, or when it is determined that the lubricant is not discharged by the process of step 250, the bending arm cylinder 10 is driven to return the bending arm 8 to the original position (step 255).

  Then, it is determined whether or not the lubricating oil is to be discharged (step 260), and when the lubricating oil is discharged, the above-described discharge control process (step 300) is executed. When the discharge control process ends or when it is determined that the lubricant is not discharged by the process of step 260, it is determined whether there is a next process (step 265).

  When the pipe 3 is bent a plurality of times, the processing from step 200 is repeated, and the carriage 30 is moved. If the bending direction is different, the chuck 34 is rotated to twist the pipe 3. The next machining location of the pipe 3 is moved to the position of the bending die 4, and the above-described operation is repeated to bend the pipe 3 three-dimensionally based on preset machining data.

  Next, a bending mandrel of the second embodiment different from the bending mandrel described above will be described with reference to FIG. In addition, about the same member as embodiment mentioned above, the same number is attached | subjected and detailed description is abbreviate | omitted.

  In the bending mandrel of the second embodiment, a screw hole 48 and a storage hole 50 are formed in the plug body 82, and an urging member 58 and a valve body 60 are stored in the storage hole 50. A seat member 62 is screwed.

  A connection hole 84 is formed in connection with the storage hole 50, and a sliding hole 86 is formed in connection with the connection hole 84. A coil spring 88 is accommodated in the sliding hole 86, and a sliding member 90 is slidably inserted therein. A gap through which the lubricating oil can pass is formed between the sliding hole 86 and the sliding member 90.

  A large-diameter hole 92 is formed so as to be connected to the sliding hole 86, and the large-diameter hole 92 is communicated with a discharge port 94 opened at the tip end in the axial direction of the plug body 82. One end of a ball plug 96 is inserted into the large-diameter hole 92, and the ball plug 96 is supported by the plug body 82 via a pin 98 so as to be swingable.

  At the time of bending, the ball plug 96 swings around the pin 98 according to the bending, so that the deformation of the pipe 3 at the bending portion can be prevented more reliably. Further, the coil spring 88 biases the ball plug 96 via the sliding member 90 so that the ball plug 96 is positioned coaxially with the plug main body 82 in a straight line. This facilitates insertion when a new pipe is inserted after the pipe 3 is removed.

  In the bending mandrel of the second embodiment, when lubricating oil is supplied from the supply flow path 70, the valve body 60 is separated from the valve seat 64 against the urging force of the urging member 58 and is blocked. The valve 72 opens. Then, the lubricating oil is discharged from the discharge port 94 into the pipe 3 through the storage hole 50, the connection hole 84, the sliding hole 86, and the large diameter hole 92.

  When the electromagnetic on-off valve 76 is closed, the valve body 60 is seated on the valve seat 64 by the biasing force of the biasing member 58, and the shutoff valve 72 is closed. Therefore, the lubricating oil remaining in the supply flow path 70 is prevented from flowing out from the discharge port 94.

Note that, similarly to the above-described embodiment, the discharge port may be formed in the radial direction of the plug body 82. Further, the plug is not limited to the ball plug 96, and may be a plug having a shape like an abacus ball.
The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

1 is a perspective view showing a schematic configuration of a bending apparatus using a bending mandrel as an embodiment of the present invention. It is an expansion perspective view of the bending head of this embodiment. It is a principal part expanded sectional view of the mandrel for bending of this embodiment. It is a circuit diagram of lubricating oil of this embodiment. It is a block diagram of the electronic control circuit of this embodiment. It is a flowchart which shows an example of the bending process control process performed in the electronic control circuit of this embodiment. It is a flowchart which shows an example of the discharge control process performed in the electronic control circuit of this embodiment. It is a principal part expanded sectional view of the mandrel for bending of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Apparatus body 2 ... Bending head 3 ... Pipe 4 ... Bending die 8 ... Bending arm 12 ... Fastening die 16 ... Wiper type 18 ... Pressure die 30 ... Carriage 34 ... Chuck 38 ... Supporting member 40 ... Bending mandrel 42 ... Rod Member 44 ... Plug 46 ... Supply hole 48 ... Screw hole 50 ... Storage hole 52 ... Bottomed hole 54 ... Communication hole 56 ... Discharge port 58 ... Energizing member 60 ... Valve body 62 ... Valve seat member 64 ... Valve seat 70 ... Supply Flow path 72 ... Shut-off valve 74 ... Pump 76 ... Electromagnetic switching valve 82 ... Plug body 84 ... Connection hole 86 ... Sliding hole 88 ... Coil spring 90 ... Sliding member 92 ... Large diameter hole 94 ... Discharge port 96 ... Ball plug 98 …pin

Claims (3)

In a bending mandrel that is inserted into a bending portion of a pipe to be bent and prevents deformation of the pipe,
A discharge port connected to a supply flow path to which lubricating oil is supplied is formed in the pipe, and a shutoff valve is interposed in the supply flow path near the discharge port, and the shutoff valve is connected to the supply flow path. A bending mandrel comprising an urging member that urges a valve body in a valve closing direction that blocks the flow of the lubricating oil from a passage to the discharge port. A long rod member and a plug attached to the tip of the lot member, and the plug is provided with the shut-off valve; and the shut-off valve is provided on the plug with a spherical valve body. The valve body is movably stored in the storage hole, and the valve body is urged by the urging member toward a tapered valve seat formed on the valve seat member screwed into the plug. The bending mandrel according to claim 1. In a bending apparatus for bending a pipe by inserting a bending mandrel into a bending portion of the pipe to be bent,
The bending mandrel includes a discharge port connected to a supply channel to which lubricating oil is supplied, the discharge port is formed in the pipe, and the supply channel in the vicinity of the discharge port Provided with a shutoff valve interposed therein, and the shutoff valve comprises a biasing member that biases the valve body in a valve closing direction that shuts off the flow of the lubricating oil from the supply flow path to the discharge port,
A bending process comprising an electromagnetic opening / closing valve interposed in the supply flow channel upstream of the shutoff valve, and a control means for controlling the electromagnetic opening / closing valve according to the bending process of the pipe. apparatus.

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