JP6010385B2 - Tube expanding device and tube expanding method - Google Patents

Description

The present invention relates to a tube expansion device, and more particularly to a tube expansion device and a tube expansion method for displaying a tube expansion torque during a tube expansion operation and a preset target torque on a display means.

  In the assembly work of the heat exchanger, a tube expander used when joining a tube (tube) and a tube plate requires a drive device for rotating the mandrel and a controller for operating the drive device. Various motors are appropriately selected as the drive source of the drive device, and the tube expansion work such as ON / OFF of the motor, normal rotation / reverse rotation, motor rotation time, the number of tube expansions is managed by the controller (for example, patents) Literatures 1-3).

  In the tube expansion work described in Patent Document 1, the torque value applied to the output rotation shaft of the motor is detected by the torque sensor 16b, and when the CPU 17a determines that this torque value has reached a preset torque value. The servo motor 16 is stopped. Then, the CPU 17a compares the torque value when the servo motor 16 is stopped with a preset upper / lower limit value T2, and when the torque value exceeds or falls below the upper / lower limit value. Is judged as NG and a warning that the amount of pressure contact is abnormal is displayed on the display to warn, and if it is appropriate, the control operation ends.

  In the pipe expansion work described in Patent Document 2, it is detected that the roller torque has reached the set torque by the relative displacement of the feed nut with respect to the frame, and the pipe expansion torque is mechanically detected, so that the pipe expansion work is properly performed. Managed.

  In the pipe expansion work described in Patent Document 3, the electric motor is rotated at a low speed in a constant low voltage state, and the rotation speed of the electric motor is controlled by a predetermined current value to manage the pipe expansion work, and the output current has a threshold value. When exceeded, the current control unit cuts off the current to prevent overcurrent.

Japanese Unexamined Patent Publication No. 7-290171 (paragraphs 0028 to 0030, FIGS. 3 and 4) Japanese Utility Model Laid-Open No. 1-143632 ([Action] on page 6) Japanese Patent No. 397657 (paragraphs 0008 to 0012, 0033, 0034)

  However, in the pipe expansion work described in Patent Document 1, since the servo motor is stopped when the torque value at the time of pipe expansion reaches a preset torque value, how the torque value (maximum torque value) changes. Therefore, there is a problem that proper pipe expansion quality cannot be guaranteed only with the maximum torque value.

  Moreover, in the pipe expansion work described in Patent Documents 1 to 3, even if the operator cannot recognize the pipe expansion torque and the target torque during the pipe expansion work, it can recognize that the pipe expansion work is abnormal. There has been a problem that it is impossible to easily analyze how the pipe expansion work is controlled and executed and what kind of abnormality has occurred.

  Even if the pipe expansion torque reaches the target torque and the control operation ends properly, work data for the pipe expansion work is not recorded, and therefore it is not possible to objectively guarantee that the pipe expansion work has been performed properly. There was a problem.

The present invention has been made in view of such a background, and provides a tube expansion device and a tube expansion method capable of accurately grasping a work state during tube expansion and performing tube expansion work with appropriate and high reliability. The issue is to provide.

In order to solve the above-mentioned problem, the present invention has a drive device that rotationally drives a tube expander to be mounted by a servo motor, and a controller that controls the operation of the drive device, and the tube expander is inserted into the tube. A tube expansion device for performing a tube expansion operation, wherein the controller includes a torque calculation means for calculating a torque from a current value flowing through the servo motor, a tube expansion torque during the tube expansion operation, and a target torque indicating a preset tube expansion completion Display means for displaying , when the switch is turned on, the controller rotates the servo motor in the normal direction to start the tube expansion operation, and calculates the tube expansion torque from the current flowing through the servo motor at the time of tube expansion, When the pipe expansion torque reaches a preset target torque, the rotation is stopped and the forward rotation of the servo motor is stopped. Starts reverse rotation at the preset rotation speed at the return operation, and when the preset reverse rotation time has elapsed, stops the rotation and notifies the completion of tube expansion, and automatically when the preset interval time has elapsed after completion of tube expansion The servo motor is rotated forward to start the next tube expansion operation .

  According to the present invention, by calculating the torque (tube expansion torque) generated from the current value flowing through the servo motor, it is possible to grasp not only the maximum value of the tube expansion torque during the tube expansion work but also the background until the maximum value is reached. Therefore, it is possible to accurately grasp and manage the work state at the time of tube expansion.

Also, by displaying the pipe expansion torque and the target torque on the display means, the operator can confirm the comparison between the pipe expansion torque and the target torque, so that the operator can visually grasp that the appropriate pipe expansion work has been completed. be able to.
In this way, the present invention can accurately perform the pipe expansion work by accurately grasping the work state at the time of pipe expansion, and can reliably ensure that the pipe expansion work has been performed properly.
In addition, the controller automatically rotates the servo motor again in the normal direction again after the completion of the tube expansion and starts the next tube expansion operation, and repeats the tube expansion operation continuously for the number of tubes to be expanded. When the switch is turned on, the expansion operation is stopped and finished.

  The invention according to claim 2 is the tube expansion device according to claim 1, wherein the controller displays the tube expansion torque on the display means in a time axis graph, and superimposes the target torque level display. It is characterized by displaying.

  According to such a configuration, the tube expansion device according to the present invention can visually compare the expansion torque and the target torque on the graph of the time axis by the display means, so the maximum value of the expansion torque during the expansion operation can be obtained. In addition, the transition until reaching the maximum value can be easily grasped and managed visually. For this reason, it is possible to confirm that the appropriate pipe expansion work has been completed more accurately and to guarantee the pipe expansion quality more reliably.

  The invention according to claim 3 is the tube expansion device according to claim 2, wherein the controller displays the rotation speed of the servo motor on the display means in a time axis graph, and the time axis of the tube expansion torque. It is characterized by being superimposed on the graph.

  According to such a configuration, the tube expansion device according to the present invention can visually compare the expansion torque and the rotation speed on the time axis graph by the display means. It can be easily grasped and managed visually.

  The invention according to claim 4 is the tube expansion device according to any one of claims 1 to 3, wherein the controller includes work recording means for recording the tube expansion torque and the rotation speed. It is characterized by.

  According to such a configuration, the tube expansion device according to the present invention can present the work record in writing by recording that the appropriate tube expansion work has been completed accurately by the work recording means. It is possible to sufficiently guarantee that the pipe expansion work has been completed.

  The invention according to claim 5 is the tube expansion device according to any one of claims 1 to 4, wherein the display means is input display means capable of touch panel input, and the input display means. To set the rotation speed of the servo motor and the target torque during the pipe expansion work set in advance.

  According to such a configuration, the tube expansion device according to the present invention allows the operator to easily input numerical values for the rotation speed and target torque at the time of tube expansion by operating the touch panel using the input display means. It is possible to accurately manage the contents of the pipe expansion work while improving the efficiency.

  The invention according to claim 6 is the tube expansion device according to any one of claims 1 to 5, wherein the controller displays the number of expansions of the expansion operation on the display means. Features.

  According to this configuration, the tube expansion device according to the present invention can grasp the number of expansions and the content of the expansion operation by displaying the number of expansions on the display means. It is also possible to ensure that proper pipe expansion work has been completed.

The invention according to claim 7 is the tube expansion device according to claim 6, wherein the controller displays on the display means a replacement time of a consumable part that is consumed according to the number of expansions. To do.
According to such a configuration, the tube expansion device according to the present invention can accurately grasp the replacement time of consumable parts and guarantee uniform tube expansion quality.

The invention according to claim 8 includes a drive device that rotationally drives a tube expander to be mounted by a servo motor, and a controller that controls the operation of the drive device, and the tube expander is inserted into the tube to expand the tube. A tube expansion method using a tube expansion device that performs work. When the switch is turned on, the servo motor is rotated forward to start the expansion operation, and the expansion torque is calculated from the current flowing through the servo motor during expansion. When the pipe expansion torque reaches the preset target torque, the rotation is stopped, and after the servo motor stops rotating forward, the reverse rotation is started at the preset rotation speed during the return operation, and the preset reverse rotation time has elapsed. Then, the rotation is stopped to notify the completion of the pipe expansion, and when the preset interval time has elapsed after the completion of the pipe expansion, the servo mode is automatically set. By normal rotation motor to initiate the next tube expanding operation, characterized by.
According to this configuration, the tube expansion method according to the present invention is a tube that expands the tube by automatically starting the next tube expansion operation by automatically rotating the servo motor again when the interval time elapses after the controller completes the tube expansion. The tube expansion work is repeated continuously for the number of lines, and when the switch is turned on again, the tube expansion work is stopped and finished.

The present invention provides a tube expansion device and a tube expansion method capable of accurately grasping a work state at the time of tube expansion and performing an appropriate tube expansion operation and reliably ensuring that the tube expansion operation has been performed properly. Can be provided.

It is a figure for demonstrating the use condition of the tube expansion apparatus which concerns on embodiment of this invention, (a) is a perspective view which shows the state with which the stand was mounted | worn, (b) is a perspective view which shows the mode at the time of tube expansion work, (C) is sectional drawing which shows a mode that a pipe is expanded. It is a front view which shows the external appearance of the main components of the tube expansion apparatus which concerns on embodiment of this invention. It is a front view which shows the automatic operation display screen of the touchscreen of the tube expansion apparatus which concerns on embodiment of this invention. It is a front view which shows the tool counter display screen of the touch panel of the tube expansion apparatus which concerns on embodiment of this invention. It is a front view which shows the graph display screen of the touchscreen of the tube expansion apparatus which concerns on embodiment of this invention. It is a flowchart which shows operation | movement of the tube expansion apparatus which concerns on embodiment of this invention.

A tube expansion device and a tube expansion method according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the tube expansion device 1 is a device that drives a tube expander 100 (see FIG. 1C), which is a tube expansion tool attached to the tip, and is an operator M (FIG. 1B). )) And a portable tube expansion device (not shown) that can be carried freely by the hand, and a stand-type tube expansion device 110 that is movably supported by the stand and reduces the burden on the operator M (see FIG. 1 (a)). There are various types.

  As shown in FIG. 1 (a), the stand type tube expansion device 110 supports the tube tube expansion device 1 by a stand 111 so as to be movable in the left and right and up and down directions and rotatably around a horizontal axis. In addition to reducing the burden so that the gravity during the tube expansion work and the reaction force at the time of rotational driving are not applied to the worker M (see FIG. 1 (b)), the tube can be expanded with high accuracy and uniformity even if it is not an expert. Can be done.

As shown in FIG. 2, the tube expanding apparatus 1 is placed on a main body 2 to which a tube expander 100 (see FIG. 1 (c)) is attached and a stand 111 (see FIG. 1 (a)). And a controller 3 that controls the operation of 2.
As shown in FIG. 1, the tube expansion device 1 is driven in a state where the tube expander 100 attached to the tip portion is inserted into the tube T (see FIG. 1B) to expand the tube T and expand the tube plate TB. (See FIG. 1 (c)) is an apparatus for fixing, and since the tube T can be fixed securely with good workability, it is widely used for fixing the tube T of a heat exchanger.

As shown in FIG. 1 (c), the tube expander 100 includes a tapered mandrel 101 with a reduced diameter on the tip side, a frame 102 that is rotatably inserted into the mandrel 101, and a circumferential direction of the frame 102. And a plurality of rollers 103 embedded so as to be rotatable along the axis.
The tube expander 100 is an optional tube expansion tool that is used by being attached to the tube tube expansion device 1 (see FIG. 2) with an attachment (not shown), and that is appropriately exchanged according to the purpose and application (hereinafter referred to as appropriate). , Sometimes referred to as “pipe expansion tool” or simply “tool”).

The tube expander 100 rotates the mandrel 101 by the tube expansion device 1 (see FIG. 2) so that the plurality of rollers 103 rotate while revolving around the mandrel 101.
For this reason, the worker M (see FIG. 1B) rotates forward with the tube expansion device 1 (see FIG. 2) in a state where the tip of the mandrel 101 is inserted into the tube T (see FIG. 1B). Then, the plurality of rollers 103 move in the axial direction along the taper of the mandrel 101, and the plurality of rollers 103 move in the radial direction so that the outer peripheral circle (circumscribed circle) formed surrounding the mandrel 101 is expanded. To do. In this way, the roller 103 rotates (rolls) while revolving around the mandrel 101 to expand the tube T.

On the other hand, after the tube expansion is completed, when the tube is expanded by the tube expansion device 1 (see FIG. 2), the roller 103 moves in the axial direction along the taper of the mandrel 101 and is reduced in diameter while returning.
In this manner, the tube expander 100 performs the tube expansion operation by rotating the mandrel 101 forward by the tube expansion device 1 (specifically, a servo motor 25 described later), and performs the return operation by reversing it.

  The tube expander 100 is broadly classified into a parallel tube expansion type and a flare tube expansion type depending on the end shape of the tube T to be expanded, but there are various tube expanders 100 depending on applications such as the tube expansion diameter and the number of rollers 103. There are different types of pipe expansion conditions and tool life.

  As shown in FIG. 2, the main body 2 of the tube expansion device 1 includes a rotation drive unit 21 to which a tube expander 100 (see FIG. 1C) is connected and an operator M (see FIG. 1B). , A universal joint 23 for connecting the telescopic hand 22 and the rotation drive unit 21, a bracket 24 for connecting to the stand 111 (see FIG. 1A), and a rotation drive And a servo motor 25 that is a driving device that rotates the unit 21.

The rotation drive unit 21 is a part to which the mandrel 101 (see FIG. 1C) of the tube expander 100 (see FIG. 1C) is integrally connected.
The rotation drive unit 21 and the mandrel 101 are connected to the rotation drive unit 21 with a shank 101a formed at the base of the mandrel 101 as an integral unit so that various tube expanders 100 can be fixed interchangeably. It has become.

The telescopic hand 22 is a cylindrical member configured such that the length in the axial direction can be adjusted, and a rotation shaft (not shown) that rotates the rotation drive unit 21 is inserted therein.
The universal joint portion 23 is a portion that transmits torque by changing the angle freely, and is fitted with a rubber cup 23a that covers the rotating portion.

The bracket 24 is L-shaped when viewed from the front, and the telescopic hand 22 and the servo motor 25 are fixed with one side 24a extending in the vertical direction interposed therebetween. The other horizontal side 24b having an L shape can be detachably fixed to the stand 111 (see FIG. 1A).
Various types of servo motors such as a DC servo motor and an AC servo motor can be applied to the servo motor 25. However, by adopting the servo motor 25, an appropriate rotational speed and torque can be obtained in accordance with use conditions as compared with a three-phase induction motor. It can set suitably.

  The controller 3 includes a semiconductor circuit, a foot switch 4 for stopping the driving of the servo motor 25, a torque calculating means 5 for calculating a torque from a current value flowing through the servo motor 25, a pipe expansion torque during pipe expansion work, The touch panel 6 which is a display means for displaying the set target torque indicating completion of the pipe expansion work and the work recording means 8 for recording work data such as the pipe expansion torque in the pipe expansion work are provided, and the electric power supplied from the main power supply AC is supplied. The control device controls the servo motor 25 to give an appropriate rotation speed to generate torque.

  The controller 3 includes a power cable 31 to which the power of the main power supply AC is supplied, a main power breaker (not shown) provided on the side surface, an operation preparation button 32 for making the operation ready, and automatic forward rotation.・ Automatic operation for switching reverse rotation, operation mode changeover switch 33 for switching manual operation that rotates only in a single direction of forward rotation or reverse rotation, a reset button 34 for resetting the generated abnormality, completion of tube expansion and occurrence of abnormality Although the buzzer 35 to notify, the emergency stop button 36, the motor power cable 37, and the encoder cable 38 are provided, since it is not specifically limited, detailed description is abbreviate | omitted.

  The foot switch 4 is operated by an operator M (see FIG. 1B) to turn on / off the electric power supplied from the controller 3 to the servo motor 25. When the foot switch 4 is stepped on once, it rotates forward and repeats the tube expansion work. Execute and stop when stepping on again.

  The torque calculation means 5 is a means for calculating the torque generated by the servo motor 25 based on the current value detected by a current sensor (not shown) that measures the current value flowing through the servo motor 25. According to such a configuration, by using the servo motor 25, it is possible to detect torque in both directions of forward rotation at the time of pipe expansion and reverse rotation at the time of return. For this reason, compared with the case where, for example, a three-phase induction motor is used as the driving device, there is no need to incorporate a reverse drive gearbox or the like (not shown) between the driving device and the telescopic hand 22, so that the configuration is simplified. Can be made lighter and more compact.

  As shown in FIG. 3, the touch panel 6 switches various display screens by touching a display screen switching bar 61 (also see FIGS. 4 and 5) at the lower end of the display screen displayed during driving. Can do. The display screen switching bar 61 includes [automatic operation] 62a for displaying an automatic operation display screen 62, [tool counter] 63a for displaying a tool counter display screen 63, and a graph display screen 64 from the left side to the right side of the screen. Touch area for switching between [Graph display] 64a to be displayed, [Input / output monitor] 65a to display an input / output monitor display screen (not shown), and [Abnormal display] 66a to display an abnormality display screen (not shown) Is partitioned.

<Automatic operation display screen (Fig. 3)>
The automatic operation display screen 62 can be displayed by touching the touch area of [Automatic operation] 62a of the display screen switching bar 61, and is displayed in different colors to indicate that the area of [Automatic operation] 62a is selected. The
In the automatic operation display screen 62, the title [Automatic operation] is displayed at the upper left of the screen, and the operation date and time display unit 62b displayed at the upper right corner of the screen and the operation provided below the operation date and time display unit 62b. A work content display unit 62c for displaying the state, a tube expansion number display unit 62d for displaying the tube expansion number [150] times and the preset value [100000] times, and a tube expansion time display unit 62e for displaying each process time during the tube expansion operation. And a rotational speed display part 62f and a torque display part 62g.

  The work date and time display unit 62b is an area for displaying the current date and time (work date and time), and since this work date and time can be recorded by the controller 3 (see FIG. 2), which work target (work) is selected. Whether such pipe expansion work has been performed can be managed along with the date and time. For this reason, it is possible to appropriately manage the pipe expansion quality by managing the pipe expansion work contents in an easy-to-understand manner.

The work content display unit 62c includes a tube expander [A] that can be arbitrarily set by the operator [M] and the type [A] of the tube expander 100 (see FIG. 1C) as a tool. ] [HB-225 OD25.4 * T3], [Operation mode] for displaying the distinction between automatic operation [AUTO] and manual operation [MANU (not shown)], and the servo motor 25 (see FIG. 2). [Rotating direction] that displays whether the tube is rotating forward [expanded CW] or returning operation [return CCW] that is rotating in the forward direction, and the status is displayed by turning on the lamp [operating], [ This is an area for displaying [CW], [CCW], [Expansion completion], and [Abnormal].
In addition, four types of tools [A], [B], [C], and [D] can be registered in advance in the display section of [Tool] according to the contents of the tube expansion work.

  The number of tubes T (see FIG. 1B) expanded by the operator M in advance is registered in [Preset value] of the tube expansion number display section 62d, and the tube expansion operation in the automatic operation mode is registered in [Number of tube expansions]. The controller 3 counts the number of times of normal completion, and the number of tubes T in which the tube expansion work has been completed normally is displayed. Note that the controller 3 counts the number of times that the pipe expansion operation is normally completed in the automatic operation mode when the pipe expansion operation is completed without the buzzer 35 notifying the occurrence of the abnormality.

  With this configuration, the worker M can easily grasp the progress status of the pipe expansion work, and can also know what number of pipe expansion processes have occurred if an abnormality occurs.

The tube expansion time display unit 62e rotates the servo motor 25 (see FIG. 2) forward to expand the tube [expansion time], reverses the servo motor 25 to perform the return operation [return time], and after the return time has elapsed. This is an area for displaying [interval] that is the interval time during which the servo motor is stopped until the next tube expansion operation is started, and the total time [TOTAL] of the tube expansion time and the return time. The expanded time, interval, and return time are displayed as execution values during work. [Return time] and [Interval] are [Return time setting value] and [Interval setting] set by worker M, respectively. Value] is also displayed.
With this configuration, the worker M can confirm that an appropriate tube expansion work has been performed by comparing a predetermined set value with an execution value of the work actually performed.

  The rotation speed display unit 62f is an area for displaying the rotation speed of the servo motor 25 (see FIG. 2), and includes a setting value during pipe expansion operation [expansion pipe RPM setting (300)] and a setting value during return operation. A certain [return RPM setting (300)], [current RPM (300)] that is the current rotational speed during operation, and a rotational speed level meter 62f1 are displayed.

[Current RPM (300)] is a value obtained by calculating the rotational speed by appropriately averaging the current value flowing through the servomotor 25.
The rotational speed level meter 62f1 is a graph that compares the current RPM (displayed at the position of 300 in the figure) with the level (displayed at the position of 300 in the figure) indicating the set value during the tube expansion operation. With this configuration, the operator M can compare the set value at the time of the pipe expansion operation with the current RPM at a glance, and thus can easily confirm that the pipe expansion has been performed at an appropriate rotation speed.

The torque display part 62g is an area for displaying the torque of the servo motor 25 (see FIG. 2), and [set torque (100.0)], which is a target torque at the time of the pipe expansion operation, and the current torque (expansion pipe) during the operation. [Current torque (75.6)], which is a pipe expansion torque during work, and a torque level meter 62g1 are displayed.
The set torque (100.0) is a target torque for switching between normal rotation at the time of the pipe expansion operation and reverse rotation at the return operation in the servo motor 25. [Current torque (75.6)] is a value obtained by calculating the torque by appropriately averaging the current value flowing through the servo motor 25.
With this configuration, the worker M can easily compare the target torque (set torque) during the pipe expansion operation with the current torque at a glance, and thus easily confirm that the pipe expansion has been performed with an appropriate pipe expansion torque. be able to.

<Tool counter display screen (Fig. 4)>
In the tool counter display screen 63, the title [Tool Counter] is displayed at the upper left of the screen, the work date and time display section 63b displayed at the upper right corner of the screen, and the display section for displaying the number of times of expansion of [Tool A]. 63c, a display unit 63d for displaying the number of times of expansion of [Tool B], and a touch area [Tool C, Tool D] for displaying Tool C and Tool D instead of [Tool A] and [Tool B] on the current screen. D] 63e.

The display contents (not shown) when the tool C and the tool D are displayed by touching the display part 63c of the [tool A], the display part 63d of the [tool B], and the [tool C, D] 63e are the same. Since it is the display content, the display part 63d of [Tool B] will be described, and detailed description of the other display part 63c and the like will be omitted.
When [Select] provided on the display part 63d of [Tool B] is touched, [Tool B] can be selected, and the display lamp 63d1 provided on the side of [Tool B] lights up.

On the display section 63d of [Tool B], the name [CB-217 OD19 * T1.2] of the tube expander [B] that can be arbitrarily set by the operator M, and [roller] and [mandrel] that are consumable parts , And [Frame] are displayed.
The display section of [Roller] displays the number of expansions [500] times of the number of expansions after the number of expansions in the lower part, and the current number of expansions [11] in the upper part. The setting of the number of tube expansions in the lower stage is such that a numeric keypad (not shown) appears when the operator M touches the area where the number of times [500] is displayed, so that an arbitrary number of times can be set. Further, the current number of tube expansions [11] in the upper stage is displayed by counting the number of times that the controller 3 (see FIG. 2) has successfully completed the tube expansion operation in the automatic operation mode. The same applies to the display portions of [MANDREL] and [FRAME].

  In the present embodiment, the operator is notified of the replacement time of consumable parts such as the roller 103 (see FIG. 1C) by displaying the number of expansions. However, the present invention is not limited to this. It is also possible to notify by turning on a lamp indicating the replacement time or sounding a buzzer.

<Graph display screen 64 (FIG. 5)
FIG. 5 shows a graph display screen 64 for tube expansion work using the tool A of FIG. In the graph display screen 64, the title [Graph Display] is displayed at the upper left of the screen, and the current data display unit 64b for displaying the current date and time, the rotation speed, and the tube expansion torque, and the tube expansion torque during the tube expansion operation are graphed. And a graph display section 64c for displaying.
The current data display section 64b displays the current date and time during the pipe expansion work, the rotational speed [0] and the torque [0.0] of the servo motor 25 (see FIG. 2) during the pipe expansion work. The current state in this display shows a state in which the pipe expansion work has just ended and the servo motor 25 has stopped, but during the pipe expansion work, the [current RPM] in the rotation speed display section 62f read from the encoder of the servo motor 25 is shown. ] (See FIG. 3) is displayed.

  The graph display unit 64c displays the pipe expansion torque (displayed by the solid line P) and the rotation speed (displayed by the broken line S) during the pipe expansion work as a graph of the time axis flowing from the left (past t0) to the right (current t7). A level display 64b1 in which the target torque [100 N · m] is displayed with a horizontal line is shown in an overlapping manner. Since the graph display unit 64b displays the current position where the operator M touches the [graph display] 64a at the right end of the graph (displayed at t7), the drawn graph moves to the left as time progresses. Is displayed. The rotation speed is displayed as an absolute value and displayed in the same direction for both forward rotation and reverse rotation. However, after the forward rotation (t1 to t3), the rotation speed is stopped (t3 to t4) and reverse rotation (t4 to t6). It can be discriminated and the visibility is also good.

  When the operator M refers to the graph display section 64c, the pipe expansion torque displayed by the solid line P and the target torque [100 N · m] can be visually compared with each other in the graph, so that the appropriate pipe expansion work is completed. This can be confirmed visually and guaranteed with peace of mind.

  Specifically, when the operator M refers to the graph display unit 64c, the servo motor 25 (see FIG. 2) starts to rotate (forward rotation) at time t1, and the rotation speed indicated by the broken line S becomes 300 rpm. It can be read from the graph that the roller 103 (see FIG. 1 (c)) abuts against the tube T and the tube expansion starts, and the tube expansion torque at this time is about 38 N · m.

  The pipe expansion torque gradually increases, and immediately before the pipe expansion torque reaches 100 N · m, the rotational speed of the servo motor 25 begins to decelerate (time t2), and the pipe expansion torque greatly exceeds the target torque [100 N · m]. As a result, the servo motor 25 stops (time t3), the pipe expansion torque also decreases rapidly, and the pipe expansion operation ends (time t4). The operator M can visually recognize the completion of such pipe expansion work by matching the horizontal line of the level display 64c1 of the target torque [100 N · m] and the solid line P of the pipe expansion torque.

  In addition, after the forward rotation of the servo motor 25 is stopped (time t3), the worker M starts the return operation (time t4), passes through the torque peak during the return operation (time t5), and maintains the rotation speed at 300 rpm. It is possible to grasp that the return operation is completed and the servo motor 25 is stopped.

The work recording means 8 (see FIG. 2) comprises a storage device, and is a device for recording various pipe work times, return time, pipe expansion torque, target torque, rotational speed, and other necessary work data in the pipe expansion work. Or output from a printer (not shown).
For this reason, the worker M can improve the pipe expansion quality by referring to the work data in the pipe expansion work, and objectively determines the pipe expansion quality by attaching various work data to the pipe expansion object (work). Can be guaranteed.

The operation of the tube expansion device 1 according to the present embodiment configured as described above will be described mainly with reference to FIGS. 1, 2, and 6.
The worker M (see FIG. 1B) attaches the tube expander 100 to the rotation drive unit 21 (see FIG. 2) disposed at the distal end portion of the main body 2 of the tube expansion device 1 to expand the tube. (See S1 in FIG. 6).

The operator M puts in a main power circuit breaker (not shown) on the side of the controller 3 (see S2 in FIG. 6), and returns the automatic operation display screen 62 (see FIG. 3) on the touch panel 6 by the tube expansion time display unit 62e. A time set value [5.0] and an interval set value [4.0] are set, and [expansion RPM setting (300)] and [return RPM setting (300)] are input through the rotation speed display unit 62f (FIG. 6). S3).
The operator M inputs [set torque (100.0)], which is a target torque when switching between normal rotation and reverse rotation, through the torque display unit 62g (see S4 in FIG. 6).

  The worker M presses the operation preparation button 32 (see FIG. 2) of the controller 3 to make it ready for operation (see S5 in FIG. 6), and when the foot switch 4 (see FIG. 2) is turned on, the servo motor 25 is driven. The rotation drive unit 21 (see FIG. 2) is rotated forward at the rotation speed at the time of tube expansion, and tube expansion operation (tube expansion operation) is started (see S6 in FIG. 6).

  The controller 3 (see FIG. 2) calculates the torque (expansion torque) after appropriately averaging the current flowing through the servo motor 25 during the expansion by the torque calculation means 5, and the expansion torque during the expansion operation is determined beforehand by the operator. When M reaches the set target torque (set torque 100 N · m, see torque display portion 62g in FIG. 3), the rotation is stopped (see t3 in FIG. 5 and S7 in FIG. 6).

  The controller 3 (see FIG. 2) is operated at a rotational speed of 300 RPM (see [Return RPM setting] of the rotational speed display unit 62f in FIG. 3) at the time of the return operation set by the worker M after the servo motor 25 stops rotating forward. When the reverse rotation is started and the reverse rotation time set by the worker M in the tube expansion time display section 62e of the touch panel 6 (see [Return time setting value 5.0] in FIG. 3) elapses, the rotation is stopped and the tube expansion is completed. 35 (see FIG. 2) is sounded (see S8 in FIG. 6).

  The controller 3 (see FIG. 2) automatically detects that the interval time set by the worker M from the tube expansion time display unit 62e of the touch panel 6 has elapsed (see [interval setting value 4.0 in FIG. 3]) after the completion of the tube expansion. Then, the servotater 25 (see FIG. 2) is rotated forward again to start the next tube expansion operation (see S9 in FIG. 6), and the tube expansion operation is repeated continuously for the number of tubes T to be expanded (see S10 in FIG. 6). ) When the foot switch 4 is turned on again, the tube expansion work is stopped and finished (see S11 in FIG. 6).

  The tube expansion device 1 according to the embodiment of the present invention calculates the torque (expansion torque) generated from the current value flowing through the servomotor 25, thereby reaching the maximum value in addition to the maximum value of the expansion torque during the expansion operation. Since it is possible to grasp the background and the rotation speed until it is done, it is possible to accurately grasp and manage the working state at the time of tube expansion.

Further, the relationship between the tube expansion torque, the target torque, and the rotation speed is displayed on the graph display screen 64 by the touch panel 6, so that the operator M visually compares the relationship between the tube expansion torque, the target torque, and the rotation speed. Since it can be confirmed, it can be confirmed at a glance that the appropriate tube expansion work has been completed.
For this reason, the tube expansion device 1 according to the embodiment of the present invention can accurately grasp the work state at the time of tube expansion and perform an appropriate tube expansion operation, and reliably guarantee that the tube expansion operation has been performed properly. can do.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications.
For example, in the present embodiment, the relationship between the tube expansion torque, the target torque, and the rotation speed is displayed on the graph display screen 64 by the touch panel 6, but the present invention is not limited to this, and only the relationship between the tube expansion torque and the target torque is displayed. It may be displayed.

DESCRIPTION OF SYMBOLS 1 Tube expansion apparatus 2 Main-body part 3 Controller 4 Foot switch 5 Torque calculation means 6 Touch panel (display means, input display means)
8 Work recording means 21 Rotation drive part 22 Telescopic hand 23 Universal joint part 24 Bracket 25 Servo motor (drive device)
31 Power cable 32 Operation preparation button 33 Operation mode switch 34 Reset button 35 Buzzer 36 Emergency stop button 62 Automatic operation display screen 63 Tool counter display screen 64 Graph display screen T Tube TB Tube plate

Claims (8)

A tube expansion device having a drive device that rotationally drives a tube expander to be mounted by a servo motor and a controller that controls the operation of the drive device, and performing tube expansion work by inserting the tube expander into a tube. And
The controller includes torque calculating means for calculating torque from a current value flowing through the servo motor;
Display means for displaying a pipe expansion torque during pipe expansion work and a target torque indicating completion of pipe expansion set in advance ,
When the switch is turned on, the controller rotates the servo motor in the normal direction to start the tube expansion operation,
Calculate the pipe expansion torque from the current flowing through the servo motor during pipe expansion, and stop the rotation when the pipe expansion torque reaches a preset target torque,
After the forward rotation of the servo motor is stopped, reverse rotation is started at a rotation speed at the time of a preset return operation, and when a preset reverse rotation time has elapsed, the rotation is stopped and the completion of tube expansion is notified,
After the completion of the expansion, when the preset interval time has elapsed, the servomotor is automatically rotated forward to start the next expansion operation .
The tube expansion device characterized by this. The controller displays the tube expansion torque on the display means in a time axis graph, and displays the target torque level display in an overlapping manner.
The tube expansion device according to claim 1. The controller displays the rotation speed of the servo motor on the display means in a time axis graph, and displays the rotation speed on the time axis graph of the pipe expansion torque;
The tube expanding apparatus according to claim 2. The controller includes work recording means for recording the pipe expansion torque and the rotation speed;
The tube expanding apparatus according to any one of claims 1 to 3, wherein: The display means is input display means capable of touch panel input, and the input display means sets the rotation speed of the servo motor and the target torque during pipe expansion work to be preset,
The tube tube expansion device according to any one of claims 1 to 4, wherein: The controller displays the number of times of expansion of the tube expansion work on the display means;
The tube expanding apparatus according to any one of claims 1 to 5, wherein: The controller displays on the display means a replacement time of a consumable part that is consumed in accordance with the number of expansions;
The tube expanding apparatus according to claim 6. Uses a tube expansion device that has a drive device that rotationally drives a tube expander to be mounted by a servo motor and a controller that controls the operation of the drive device, and performs tube expansion work by inserting the tube expander into the tube. Tube expansion method,
When the switch is turned on, the servo motor is rotated forward to start the tube expansion operation,
Calculate the pipe expansion torque from the current flowing through the servo motor during pipe expansion, and stop the rotation when the pipe expansion torque reaches a preset target torque,
After the forward rotation of the servo motor is stopped, reverse rotation is started at a rotation speed at the time of a preset return operation, and when a preset reverse rotation time has elapsed, the rotation is stopped and the completion of tube expansion is notified,
After the completion of the expansion, when the preset interval time has elapsed, the servomotor is automatically rotated forward to start the next expansion operation.
A tube expansion method characterized by the above.

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