JP2013000794A - Pipe bender, method for manufacturing bending pipe, and pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform accurate positioning in a circumferential direction with reference to the central axis of a joint part of a pipe by use of a general-use clamping jig.SOLUTION: A pipe bender includes: a pipe feed device 5, which is equipped with a pipe chuck part 4 for fixing a pipe 21 and with a tilting device 6 for turning the pipe 21 with reference to its central axis; a guide rail 1, which guides the pipe feed device 5; a reactive force receiving die 10, which receives the pipe 21; a bending device 8, which is equipped with a bending clamp 8a for fixing a bending die 7 and the pipe 21, arranged on one end side of the guide rail 1, and bends the pipe 21 with the bending die 7; a cutter part 12, which cuts the pipe 21; a laser marker part 20, which inscribes a mark on a predetermined position in the vicinity of the front end of the pipe 21, and which inscribes, in the vicinity of the rear end where the pipe 21 is cut with the cutter part 12, a mark that is met with the mark on the front end of the pipe 21 to be next worked in order to perform positioning in the circumferential direction; and an automatic controller 16, which subjects each of these devices and parts to sequence control.

Description

  The present invention relates to a pipe bender for forming a pipe into a predetermined shape, a method for manufacturing a bending pipe, and a pipe joint. More specifically, the present invention relates to a rotational direction based on the central axis of a plurality of three-dimensionally complicated pipes. The present invention relates to a pipe bender, a bending pipe, and a pipe joint for performing positioning easily and accurately, and using a general-purpose fixing jig to fix and join them.

  The pipes constituting the refrigerant circuit of the air conditioner or the refrigerator are three-dimensionally bent by a pipe vendor as described in Patent Document 1 and Patent Document 2, for example. Bending pipes that have been bent are connected by brazing or the like.

Japanese Utility Model Publication No. 61-111616 (page 3, FIGS. 1 to 3) Japanese Patent Laid-Open No. 3-169433 (page 3, FIGS. 1 to 4)

  When connecting bent bending pipes by brazing or the like, a dedicated holding jig having an arm arranged in a three-dimensional assembled state is used, and the bending pipe is fixed by the arm, thereby enabling accurate positioning.

  However, in the case of large refrigerators and special-purpose refrigerators, if a dedicated holding jig is used, the production rate is low because the number of produced units is low, and the holding jig itself is also large and expensive. Cost increases. On the other hand, a general-purpose fixing jig is used and visually assembled and fixed using a protractor and a ruler in three dimensions. However, in this method, the assembly accuracy is worse than when a dedicated fixing jig is used. There is a problem of becoming.

  The present invention has been made to solve the above-described problems. In a large-sized refrigerator, a special-purpose refrigerator, or the like, a bending pipe that is three-dimensionally bent is connected by brazing or the like. Another object of the present invention is to reduce the manufacturing cost by using a versatile holding jig so that it can be assembled easily and accurately.

A pipe bender according to the present invention includes a pipe chuck device that includes a pipe chuck portion that holds and fixes a pipe, and a tilting device that rotates the pipe with respect to the central axis of the pipe,
A guide rail for guiding the pipe feeding device,
A reaction force receiving mold having a groove-like portion that allows the pipe to be fitted and moved;
A bending mold for bending the pipe, and a bend clamp for clamping the pipe; and provided at an end of the guide rail in the feed direction of the pipe. A bending device that rotates to bend along the groove of the bending mold,
A cutter unit having a blade for cutting the pipe;
A marker portion provided between the bending die and the reaction force receiving die, for marking the vicinity of the start end of the pipe feeding start by the pipe feeding device and the vicinity of the end portion cut by the cutter portion;
Each of these devices and each unit is equipped with an automatic control device that performs sequence control,
In the automatic control device, the marker portion marks a predetermined position in the circumferential direction of the start end portion of the pipe being processed, and the pipe to be processed next to the pipe being processed at the end portion of the pipe being processed It is controlled so as to apply a mark for positioning in the circumferential direction in abutment with a mark applied in the vicinity of the start end of the.

The bending pipe manufacturing method according to the present invention uses the pipe vendor according to the present invention,
The first step of inserting a mandrel into a straight pipe,
A second step of fixing the pipe into which the mandrel is inserted to the pipe feeder;
The tip of the pipe into which the mandrel is inserted is inserted into the reaction force receiving groove portion by the pipe feeding device, and is marked at a predetermined position in the circumferential direction near the starting end of the pipe being fed to the marker. Applying the third step,
Further, a fourth step of feeding the pipe into which the mandrel is inserted by a predetermined length by the pipe feeding device and clamping by the bend clamp,
A fifth step of bending the pipe clamped by the bend clamp by turning a predetermined angle along the groove of the bending mold;
A sixth step of releasing the clamp of the bend clamp, feeding the pipe bent in the fifth step by the pipe feed mechanism by a predetermined length, and rotating the pipe by a predetermined angle by the tilting device;
Repeating the sixth step from the third step according to the number of bend formations,
In the final step of the repetition process, the pipe is cut at the cutter portion, and in the circumferential direction in the vicinity of the end portion of the pipe being processed, in the vicinity of the start end portion of the pipe to be processed next to the pipe being processed In order to position, the seventh step of performing the marking by positioning the position to be engraved by rotating the pipe under processing with the tilting device,
An eighth step of cutting the pipe with the cutter unit is provided.

  The pipe joint according to the present invention includes a pipe bender according to the present invention or a pipe pipe near one end of one of the two pipes manufactured by the method for manufacturing a bending pipe according to the present invention or the other pipe. A tube expansion portion or a contraction tube portion is formed in any one of the vicinity of the start end portion, and the positions of the inscription on the end portion of the one pipe and the inscription on the start end portion of the other pipe are aligned with each other. The end portion of the pipe and the start end portion of the other pipe are fitted together, and the fitted portion is joined by brazing or welding.

  According to the pipe bender, the bending pipe manufacturing method, and the pipe joint according to the present invention, a versatile and simple holding treatment is provided by providing circumferential positioning marks in the vicinity of the start and end portions of the bending pipe. The position in the circumferential direction can be determined and fixed easily by visual inspection using tools, and the manufacturing cost can be reduced even in a large-scale refrigerator having a small production number.

It is a perspective view which shows Embodiment 1 of the pipe vendor which concerns on this invention. It is a top view which shows Embodiment 1 of the pipe vendor which concerns on this invention. It is a perspective view which shows an example of the bending pipe shape | molded with the pipe vendor which concerns on this invention. It is a top view which shows the pipe joint part using the bending pipe shape | molded with the pipe vendor which concerns on this invention, or the manufacturing method of the bending pipe which concerns on this invention.

Embodiment 1 FIG.
1 is a perspective view showing Embodiment 1 of a pipe vendor according to the present invention, FIG. 2 is a plan view showing Embodiment 1 of the pipe vendor according to the present invention, and FIG. 3 is a pipe vendor according to the present invention. It is a perspective view which shows an example of the pipe shape | molded by.

  As shown in FIGS. 1 and 2, the pipe bender 2 of the first embodiment includes a pipe chuck portion 4 that holds and fixes the pipe 21 and a tilting device that rotates the pipe 21 with respect to the central axis of the pipe 21. 6, a reaction force receiving die 10 having a groove 9 in which the pipe 21 can be fitted and moved, a guide rail 1 for guiding the pipe feeding device 5, a bending die 7, A bending clamp 8 a that clamps the pipe 21, a bending device 8 provided on one end side of the guide rail 1, a cutter unit 12 having a blade 17 for cutting the pipe 21, and a pipe feeding device 5 for the pipe 21. A laser marker portion 20 provided between the bending die 7 and the reaction force receiving die 10 in order to mark the vicinity of the leading end portion at the beginning of feeding and the vicinity of the end portion cut by the cutter portion 12. , And a automatic control unit 16 for sequence control of these devices and units. The roller 18 supports the pipe 21 so as not to be damaged when the pipe 21 moves.

  In the automatic control device 16, the laser marker unit 20 marks a predetermined position in the circumferential direction in the vicinity of the start end of the pipe 21 being processed, and the pipe of the pipe being processed is near the end of the pipe being processed. Next, control is performed so as to apply a mark for positioning in the circumferential direction in abutment with a mark applied near the start end of the pipe to be processed.

  The tilting device 6 is driven by a tilting motor 6a, the pipe feeding device 5 is driven by a linear motor driven by a drive coil 5a, and the bending device 8 is driven by a motor built in the lower part of the bending die 7. Then, the bending speed is controlled by the speed reducer and the encoder, and it rotates as shown by the arrow.

Next, the manufacturing method of the bending pipe by the pipe bender of this Embodiment 1 is demonstrated.
A straight pipe 21 having a predetermined length is prepared. The pipe 21 is generally circular in cross-sectional shape.
First, a mandrel is inserted into the pipe 21 so as not to collapse into an elliptical shape when bent (first step). The mandrel penetrates the pipe chuck portion 4 and the pipe feeding device 5, and the tip is in a position where the bending die 7 starts to bend.

  The pipe 21 into which the mandrel is inserted is held and fixed by the pipe chuck portion 4 (second step).

  Next, the starting end portion of the pipe 21 into which the mandrel has been inserted is inserted into the groove 9 of the reaction force receiving die 10 by the pipe feeder 5 and is sent to the laser marker portion 20 in a predetermined circumferential direction near the starting end portion. Mark the position (third step).

  Further, the pipe 21 into which the mandrel is inserted is fed by a predetermined length by the pipe feeding device 5 and clamped by the bend clamp 8a (fourth step).

  Next, the bending device 8 is bent by turning the pipe 21 clamped by the bend clamp 8a by a predetermined angle along the groove of the bending die 7 (fifth step). At this time, the reaction force generated by the bending is applied to the straight portion of the pipe 21, but the reaction force is received by the groove-like portion 9 of the reaction force receiving die 10, and the straight portion can maintain a predetermined position.

  Next, the clamp of the bend clamp 8a is released, the bending device 8 is returned to the origin, the pipe bent in the fifth step is fed by a predetermined length by the pipe feeding device 5, and the predetermined tilting device 6 is used. (Sixth step). As a result, an intermediate straight portion continuing from the bent portion is provided.

  Further, the third process to the sixth process are repeated according to the number of bend formations, near the final end that is a cut portion by the cutter unit 12 that is the final process of the repetition process, and near the start end of the pipe to be processed next. In order to make a positioning in the circumferential direction in abutment with the marking to be applied to the pipe, the pipe 21 being processed is rotated by the tilting device 6 to position the marking position, and the marking is performed by the laser marker section 20 (seventh step). . Next, the pipe 21 is cut by the cutter unit 12 (eighth step).

  The consistent operation from the initial marking to the final marking and cutting is automatically controlled by the automatic control device 16 based on pre-programmed data.

  The laser marker unit 20 has a marking range of several centimeters and can be repeatedly marked with high accuracy. In addition, the stamping is possible even if it is slightly away from the pipe 21 to be stamped. Therefore, if the laser marker portion 20 is aligned with the pipe 21 having the largest diameter to be processed, automatic marking is performed for the pipes 21 of all diameters in conjunction with the pipe vendor sequence control. It becomes possible. Since the laser marker unit 20 can be used to enter characters, it is possible to enter design drawing numbers and notes on the pipe 21.

  Note that in the laser marking, the irradiated portion is heated to a high temperature, so that the surface metallographic structure is altered and the surface roughness is increased. The copper tube needs to maintain a high internal pressure, so that it is necessary to perform marking with a laser within a range that does not affect the fatigue strength and reliability of the copper tube, and the laser marker 20 is imprinted very thinly. This is very important.

  The marking device is not limited to the laser marker unit 20. For example, a marker unit such as a punch stamping machine is also applicable. In this case, since it is necessary to adjust the position of the punch for each diameter size of the pipe 21, it is necessary to add one-axis control for driving the punch marking device in the radial direction of the pipe in order to automate.

  FIG. 3 is a perspective view showing an example of a bending pipe formed by the pipe bender of the first embodiment. As shown in FIG. 3, the pipe 21 is formed with straight portions 25a, 25b, 25c, 25d and bent portions 24a, 24b, 24c continuous to the straight portions 25a, 25b, 25c, 25d. Engraved marks 23a and 23b are formed by the laser marker portion 20 in the vicinity of the end portion and the end portion.

  The pipe 21 in FIG. 3 is made of an O material of C1220, and uses a straight copper pipe having a diameter of 15.88 mm and a wall thickness of 1.1 mm. After the copper tube is cut to a length of about 303 mm and attached to a feeding device of a bending machine, a marking 23a is applied to a predetermined position in the circumferential direction near the start end, and a straight line portion 25a of 29 mm is sent from the start end, A bending die having a bending radius of 30 mm is bent at a bending angle of 91 degrees to form a bent portion 24a, and a straight portion 25b of 71 mm is fed, and the pipe 21 is rotated 336 degrees in the circumferential direction with respect to the central axis to bend The bent portion 24b is formed by bending at an angle of 128 degrees, and the straight portion 25c of 40 mm is fed, the pipe 21 is rotated 145 degrees in the circumferential direction with respect to the central axis, and the bent portion 24c is bent at a bending angle of 45 degrees. Finally, the pipe 21 is rotated in order to position it in the circumferential direction by abutting with a stamp applied to the vicinity of the start end of the pipe to be processed next in the vicinity of the terminal end that is the cutting position. And positioning the position engraved subjected to marking 23b Te are fabricated by cutting.

  According to the first embodiment, the circumferential direction marking is provided in the vicinity of the start end portion and the end end portion of the pipe 21 so that the circumferential direction can be easily visually confirmed using a general-purpose simple holding jig. Can be accurately determined and fixed, and the manufacturing cost can be reduced even in a large-scale refrigerator having a small number of production.

Embodiment 2. FIG.
FIG. 4 is a plan view showing a pipe joint portion using a pipe bender according to the present invention or a bending pipe formed by the method for manufacturing a bending pipe according to the present invention. As shown in FIG. 4, the expanded portion 22 is formed at the end of one pipe 21a, and the start end of the other pipe 21b is fitted.

  As shown in FIG. 4, the joint portions of the pipes 21a and 21b are provided with engraving marks 23a and 23b for positioning in the circumferential direction, so that a complicated bending such that a plane as an assembly reference cannot be understood at a glance. Even when brazing the pipes 21 having a plurality, a general-purpose holding jig can be used to easily align the rotational position visually, so that the brazing operation can be performed accurately, and even a large-sized refrigerator having a small number of production can be manufactured. Cost can be reduced.

  In the second embodiment, the expanded pipe part 22 may be a contracted pipe part, or the start end part of the other pipe 21b may be the expanded pipe part or the contracted pipe part, and the end part of the one pipe 21a may be fitted. .

  The pipe bender, the bending pipe manufacturing method, and the pipe joint according to the present invention can be effectively used for manufacturing a large refrigerator, a special refrigerator, and the like.

1 guide rail, 2 pipe bender, 4 pipe chuck, 5 pipe feeder, 5a drive coil, 6 tilting device, 6a tilting motor, 7 bending mold,
8 Bending device, 8a Bend clamp, 9 Groove, 10 Reaction force receiving type,
12 cutter parts, 16 automatic control devices, 17 blade parts, 18 rollers,
20 Laser marker part, 21, 21a, 21b Pipe, 22 Expanded part,
23a, 23b carved seal, 24a, 24b, 24c bent part,
25a, 25b, 25c, 25d Straight portions.

Claims (3)

A pipe feeding device comprising a pipe chuck portion for gripping and fixing a pipe, and a tilting device for rotating the pipe with respect to the central axis of the pipe;
A guide rail for guiding the pipe feeding device,
A reaction force receiving mold having a groove-like portion in which the pipe is fitted and moved; a bending mold having a groove in which the pipe is fitted; a bending mold for bending the pipe; and a bend clamp for clamping the pipe. A bending device provided at an end portion of the guide rail in the feed direction of the pipe and rotating the pipe so as to bend along the groove of the bending mold,
A cutter unit having a blade for cutting the pipe;
A marker portion provided between the bending die and the reaction force receiving die, for marking the vicinity of the start end of the pipe feeding start by the pipe feeding device and the vicinity of the end portion cut by the cutter portion;
Each of these devices and each unit is equipped with an automatic control device that performs sequence control,
In the automatic control device, the marker portion marks a predetermined position in the circumferential direction of the start end portion of the pipe being processed, and the pipe to be processed next to the pipe being processed at the end portion of the pipe being processed A pipe bender characterized by being controlled so as to make a stamp for positioning in the circumferential direction in abutment with a stamp made in the vicinity of the start end of the pipe. Using the pipe vendor of claim 1 above,
The first step of inserting a mandrel into a straight pipe,
A second step of fixing the pipe into which the mandrel is inserted to the pipe feeder;
The tip of the pipe into which the mandrel is inserted is inserted into the reaction force receiving groove portion by the pipe feeding device, and is marked at a predetermined position in the circumferential direction near the starting end of the pipe being fed to the marker. Applying the third step,
Further, a fourth step of feeding the pipe into which the mandrel is inserted by a predetermined length by the pipe feeding device and clamping by the bend clamp,
A fifth step of bending the pipe clamped by the bend clamp by turning a predetermined angle along the groove of the bending mold;
A sixth step of releasing the clamp of the bend clamp, feeding the pipe bent in the fifth step by the pipe feed mechanism by a predetermined length, and rotating the pipe by a predetermined angle by the tilting device;
Repeating the sixth step from the third step according to the number of bend formations,
In the final step of the repetition process, the pipe is cut at the cutter portion, and in the circumferential direction in the vicinity of the end portion of the pipe being processed, in the vicinity of the start end portion of the pipe to be processed next to the pipe being processed In order to position, the seventh step of performing the marking by positioning the position to be engraved by rotating the pipe under processing with the tilting device,
A bending pipe manufacturing method comprising an eighth step of cutting the pipe at the cutter portion. The pipe bender according to claim 1 or the bending pipe according to claim 2, and one of the two pipes manufactured by the method of manufacturing a bending pipe, near the terminal end of the other pipe or near the starting end of the other pipe. A pipe expansion section or a contraction pipe section is formed on any one of the above, the position of the marking on the terminal end of the one pipe is aligned with the marking on the start end of the other pipe, and the pipe on the one pipe A pipe joint, wherein the end portion and the start end portion of the other pipe are fitted together, and the fitted portion is joined by brazing or welding.

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