JPH02142623A - Cutoff bender - Google Patents

Abstract

PURPOSE:To drastically reduce the generation of defectives in bending and cutting off of tubes by introducing lubricating fluid from the ends of the long side tubes immediately before or before bending work is started. CONSTITUTION:In a cutoff bender 1, the long size tubes W1, W2 are bent and cut off to continuously manufacture plural short size bend pipes P1, P2. Immediately before or before bending work is started, oil nozzles are connected with the ends of the long size tubes W1, W2 to introduce lubricating fluid (lubricant such as spindle oil, dynamo oil, machine oil, etc.) into the long size pipes. By this method, the generation of defectives can be reduced drastically in bending and cutting off of the pipes.

Description

[Detailed Description of the Invention] [Object of the Invention] Lord! The present invention involves bending and cutting long tubes to continuously manufacture short bent tubes such as U-shaped tubes and L-shaped tubes, and the method of bending the tubes at the time of cutting them. This invention relates to a cant-off bender that removes chips adhering to the inner surface of the tip of a long tube.

Traditionally, a cut-off bender is used to continuously manufacture multiple bent tubes such as short U-shaped tubes and L-shaped tubes from long tubes by bending and cutting them. The pipe is sent to a pipe bending device with the base of the bending allowance held between the clamping molds, and the pipe bending device bends the end portion of the long pipe with the clamping mold. Bend the long tube into a U-shape, L-shape, etc. while holding it in place along the processing surface of the bending die, and then cut the long tube into short pieces using a rotary cutting tool such as a metal saw. Manufactures bent pipes.

The pipe bending device installed in this cut-off bender is designed to insert a metal core into the long pipe in order to prevent the diameter of the long pipe from deforming during the bending process. In this case, the core metal is moved while handling the inner surface of the long tube, and for this reason, lubricating oil is jetted from the tip of the core metal so that the long tube does not tear due to the friction of the core metal.

However, after bending this long tube into a U-shape, L-shape, etc.
The chips generated when cutting such a long pipe into short bent pipes adhere to the inner surface of the tip of the long pipe to be bent next, and in this state, the long pipe is bent into a 0-shape or an L-shape. When bending the tube, the core metal is inserted into the long tube and moved while being handled, so chips are reduced on the inner surface of the long tube due to the pressure of the core metal, and the unevenness of the chips even reaches the outer surface. There were many cases where it could be seen.

Furthermore, when this bent pipe is used for air conditioning, the chips that have settled on the inner surface of the bent pipe cannot be removed even during the cleaning process after manufacturing, and the bend is often found during subsequent inspections. If the pipe is shipped with this oversight in mind, after the pipe is assembled, chips may come off due to vibration during use of the air conditioning equipment and get stuck in the pulp, causing a breakdown. There was a risk that the chips that had accumulated inside the machine would cause many troubles.

For this reason, currently, in order to remove the adhesion of chips generated during cutting before bending the long tube, an air compressor outlet is connected to the end of the long tube, and the pressure of the air is applied to the tip of the long tube. A method is used in which the chips adhering to the vicinity are removed by blowing out, but even with this method, the defect rate due to the adhesion of chips is about 10 to 20% of the manufactured quantity.
is also occurring.

The reason for this defect rate is that air compressors are used with pipes installed at various locations within the factory, so the pressure is unstable, and the pressure from the tip of the long pipe to the end is quite high. The tip of the long pipe often does not have enough pressure to remove chips.
Furthermore, as mentioned above, lubricating oil is squirted into the long tube from the core metal inserted into the tube during bending, but during cutting, the lubricating oil also sprays onto the inner surface of the tip of the long tube that is to be bent next. Since the lubricating oil forms an oil film, chips adhere to this lubricating oil, making it more difficult to remove chips using the pressure of an air compressor. Even if you used a pipe to connect it to the end of a pipe, you would have to use something quite strong, which would have the consequent disadvantage of requiring large equipment. Quantity The present invention involves bending and cutting a long tube to produce short bent tubes such as U-shaped tubes and L-shaped tubes. By removing chips adhering to the inner surface of the tip of the tube, the incidence of defective products due to the erosion of chips caused by the pressing of the core metal against the inner surface of the long tube during bending is drastically reduced. It is intended to provide a cut-off vendor.

[Structure of the invention]

1. In view of this point, the present invention provides a car/off bender that continuously manufactures a plurality of short bent pipes from a long pipe by bending and cutting the long pipe. An attempt has been made to solve the above-mentioned drawbacks by providing a cut-off bender which is provided with a means for introducing a lubricating fluid from the end of a long tube immediately before bending.

In the present invention, a lubricating fluid is introduced from the end of the long tube by an appropriate means immediately before the bending process, and its viscosity and fluid action are used to improve the long tube to be bent next at the time of cutting. This allows chips adhering to the inner surface of the tip to flow out and be removed.

1. Hereinafter, an embodiment of the present invention will be described based on the drawings. 1 is a cut-off bender, and the cut-off bender J has a built-in hydraulic device (not shown) and is mounted on a base 2 in a long length. A tube feeding device 3 for forwarding the tube 6 is installed,
A tube bending device w, 4 is disposed continuously with the tube feeding device 3, and an appropriate drive unit (not shown) is installed between the tube feeding device 3 and the tube bending device 4 in a direction perpendicular to the tube feeding direction. ) bends the pipe P,,
A rotary cutting instrument 5 is provided which is movable forward and backward to cut P2 and is connected to a drive unit (not shown) such as a motor through a suitable transmission mechanism (not shown).

The hydraulic equipment includes a hydraulic pump, a motor, a tank, piping, etc., forming a series of hydraulic circuits, and the oil jet ports in this hydraulic circuit are connected to the ends of long pipes H, Wt, and long pipes W, W, W, etc. A lubricating fluid (lubricating oil such as spindle oil, dynamo oil, machine oil, etc.) with an appropriate pressure is introduced into the inside of the pipe. W,, W, are sent to the tube bending device 4, and are automatically controlled so as to be ejected just before the tube bending device F4 starts the bending process.

The long pipe W 6 is made of a pipe material such as a copper pipe, and is either a straight pipe with a predetermined length or a thread wound around a bobbin, and the tip force is applied to the pipe feeding device 3. The oil outlet of the hydraulic equipment described above is connected to the end of the oil outlet.

The pipe delivery wire w3 is configured to clamp the long pipes W8 and II+2 and send them to the pipe bending device 4, and a fixed clamping mold 7 is disposed in front of the movable clamping mold 6 in the pipe delivery direction. It is configured as follows.

First, the movable tightening die 6 will be explained.
A rectangular shape is pierced through the approximate center of the movable block 8, and the upper surface of the through hole 9 is inserted into the long tube. The upper part of the movable block 8 is formed into an upper clamping part 11, while the through hole 9 of the movable block 8 is provided with a slightly smaller gap 12 in the vertical direction to form a substantially rectangular lower clamping part. Part 1
3 is mounted so as to be vertically movable by an appropriate drive unit (not shown).

Moreover, the grooves 10 and 10 of the upper clamping part 11 are formed on the upper surface thereof.
A groove 14.14a is formed in approximately the lower half of the pipe diameter of the long pipe W2, which faces the pipe diameter of the long pipe W2 and forms the pipe diameter of the long pipe W2. When moved, the long tubes 1dl and 14t are held in place.

A through hole 15.15a is provided in both sides of the lower part of the moving block 8 in the pipe delivery direction.
a has a predetermined length in the pipe delivery direction, and a guide bar 16.16a installed parallel to the base 2 is inserted through the guide bar 16.16a, so that the movable block 8 can be freely slid. 16a, the shaft of a drive unit 17 such as a cylinder arranged at the rear of the tube feeding device 3 is connected and fixed to the lower center of the moving block 8 via a coupling 18. The movable clamping die 6 is driven to reciprocate in the tube delivery direction.

19 is a protruding rod sending mechanism section; the ejecting rod sending mechanism section]
Reference numeral 9 has a through hole 20.20a penetrating both sides of the center of the moving block 8, the through hole 20.20a having a predetermined length in the pipe delivery direction, and a guide rod 21.21a disposed in parallel. It is slidably inserted, and each end thereof is fixed by a connecting plate 22, to which the shaft of a driving part 23 such as a cylinder is connected.

Further, the lower legs of a gate-shaped frame 24 are attached to the tip of the guide rod 21.21a, and a protruding rod 25.25a having a predetermined length is attached to the center of the upper part of the frame 24 in the direction of pipe delivery. The protruding rod 25.25a is provided in a protruding manner, and the protruding rod 25.25a is moved forward and backward in the tube delivery direction via the guide rod 21.21a by driving the drive unit 23.

Next, the fixed tightening type 7 will be explained. The fixed tightening type 7 penetrates the fixed block 26 in a substantially central part in a square shape, and has a long pipe W1 in the upper surface of the through hole 27.
A half groove 28.28a on the surface of the pipe diameter h is carved in the pipe delivery direction to form an upper clamping part 29 at the upper part of the circumferential block 26, while a lower clamping part 30 is formed in the through hole 27 of the fixed block 26. It is mounted with a slightly small gap 31 in the vertical direction so as to be vertically movable by an appropriate drive unit (not shown).

The lower clamping part 30 has a fixed block 26 in the tube delivery direction on the upper part of the vertically movable body 32 which is moved up and down by the above-mentioned appropriate drive part.
A long pipe W is formed to extend by a predetermined length, and a long pipe W is formed on the upper surface thereof facing 428.28a of the upper clamping part 29.
A tube feeding body 34 having grooves 33, 33a carved in the substantially lower half of the tube diameter of the long tube W2 forming the tube diameter of W2 in the tube delivery direction is arranged to be slidable in the tube delivery direction. It is composed of:

Reference numeral 35 denotes an advancing/retracting mechanism section that allows the tube feeding small body 34 to freely move forward and backward in the tube delivery direction from the fixed block 26 as the movable clamping die 6 moves forward and backward. The upper part of the side surface is fixed to the pipe feeding small body 34, and a support rod 37 is provided protruding from the lower center portion of the side surface, and the support rod 37 is slid into a hole 38 formed in the center of the vertically movable body 32. The support plate 36 is movably inserted and inserted, and a spring 39 installed inside the vertically movable body 32 biases the support plate 36 rearward, while a movable tightening mold 6 is attached to the other side of the support plate 36 so as to move forward. A push-out rod 40 is provided in a protruding manner and has a length sufficient to push the tube feeding small body 34 forward when the tube is moved.

When the long tubes W1, W are sent out from the movable clamping die 6, the extrusion rod 40 is moved to the support plate 36 by the movable clamping die 6.
At the same time, the lower holding part 30 is pushed out through the tube feeding small body 34.
The upward movement of the pipe clamps the long pipe W,, W, and sends out the long pipe W2 to the pipe feeding device 3, and after bending the long pipe W2, the movable clamping die 6 When the tube moving body 34 moves rearward, the tube sending body 34 retreats.

Further, 41.41a is a through hole through which the protruding rod 25.25a sent out by the ejecting rod delivery mechanism 19 is inserted, and is provided through the upper center of the metering block 26.

Next, to explain the tube bending device w4, the tube bending device 4
is bent on a mounting stand 43.43a set up on the base 2 so that the bending die 42 is located in front of the identification clamping die 7 of the tube feeding device 3 in the tube feeding direction with a predetermined interval. Mold 4
2 is fixed and rotated relative to the bending die 42 with its center of curvature as the axis.
1. A rotary die 45 for bending W2 along the processing surface 44 of the bending die 42 is provided, and the rotary die 45
In order to prevent the diameter of the long tube 2 from being deformed during the bending process, a core metal insertion/extraction device 47 for inserting the core metal 46, 46a into the long tube W2 is used to process the bending die 42. The metal cores 46 and 46a are positioned in the downward tangential direction of the surface 44.

The bending die 42 has a processing surface 44 formed into a substantially arc shape, and also holds the long tubes H, W, which are held when bending the long tube 7 along the processing surface 44. A groove 48, 48a of approximately half the diameter of the pipe is carved, and the bending die 42 has a bent pipe P,, P! which has been bent and cut.
In order to remove the bending member from the mold 42, a through hole 49.49a is formed through which the protruding rod 25.25a of the ejecting rod delivery mechanism 19 is inserted.

The rotary die 45 has a core inserting/extracting device 47 installed on its base 50 so that the core bar 46.46a is positioned along the downward tangential direction of the groove 48.48a of the bending die 42, and the rotary cutting tool 5 The bearing stand 51 is fixed on the base 2 by positioning it on the opposite side, and the bearing stand 51 is equipped with a drive unit such as a motor (
A rotary shaft 52 is pivotally connected to the base plate 50 via a suitable transmission mechanism (not shown), and a movable frame 53.53a fixed to the base 50 is pivotally mounted to the rotary shaft 52. The rotary shaft 52 rotates as driven by the drive unit, so that the rotary mold 45 rotates relative to the bending mold 42 with its center of curvature as the axis.

The core insertion/extraction device 47 inserts the groove 48 of the bending die 42 as described above.
．． A core bar 46.46a is disposed along the lower tangential direction of 48a, and a long pipe W1.6 is disposed along the core bar 46.46a.
A groove 54, 54a of approximately half the diameter of the tube is carved therein, and the tube support portion 55, which holds approximately the lower half of the tube diameter of the long tube W, W2 sent out from the tube feeding device 3, is bent with a metal. Type 4
2, the core bar 46.46a and the tube support part 55 are fixed to the slider 56, and the slider 56 is fixed to the base 50.
The slider 56 is connected to a cylinder 59 fixed on the base 50 via a connecting member 58, and when the cylinder 59 is driven, the slider 56 slides to extend the length. Shaft tube W1, W2
is held between the lower tangential portion of the groove 48.48a of the bending die 42 and the groove 54.54a of the tube support portion 55, and the core metals 46, 46a are inserted into the long tube W 6 from its tip. It is made like this.

In this embodiment, a cut-off bender 1 is shown in which a long pipe W,, W, is bent into a 0-shaped pipe, but the cut-off bender 1 is not limited to such a method, and may be used to bend a bent pipe such as an L-shaped pipe. And hydraulic equipment is built into the cut-off bender that performs the cutting process.
It is sufficient that the oil spout in the hydraulic circuit is connected to the end of the long pipe 86 to be bent and cut.
Furthermore, the number of long tubes to be bent and cut is not limited to two as in this embodiment, but may be a plurality of tubes.

Next, to explain the operation of the cut-off bender according to the present invention, first, an oil spout in a hydraulic device is connected to the end of the long pipe 1, W2, and then the long pipe -1, h is connected to the pipe delivery point f.
It is clamped and fixed to f and 3 and sent to the pipe bending device 4.

To explain in such a state, as the lower clamping part 3 of the movable clamping die 6 moves upward,
The long tube W3.6 is held between the groove 10.10a of the upper holding part 11 and the groove 14.14a of the lower holding part 13, and the drive part 17
The movable clamping mold 6 moves forward in the pipe delivery direction and delivers the distal ends of the long pipes W, W, by a predetermined length (bending allowance) to the identification clamping mold 7.

Then, the front part of the movable clamping die 6 presses the end of the extrusion rod 40 in the advancing/retracting mechanism part 35 of the fixed clamping die 7 to push the tube feeding small body 34 forward, and at the same time, the lower clamping part 30 By moving upward, the long tubes W, Wt move between the grooves 28.28a of the upper clamping part 29 and the grooves 33.33 of the lower clamping part 30.
a, and the tube feeding small body 34 projects forward from the fixed block 26, so that the tube feeding small body 34 bends the lower part of the long tube Wl, wz (bending allowance) sent to the tube bending device 4. In order to support the long tube edge W when rotating the rotary die 45, that is, during bending process! This prevents it from buckling downward.

In such a process, a long tube, which will be explained next.

, h until just before the bending process begins.

A lubricating fluid is supplied to a predetermined pressure from an oil spout of a hydraulic device connected to the end of a long pipe W.

, 6, core metal insertion/extraction bag W47 for bending process
This serves as a lubricating oil when inserting the core metals 46 and 46a.

Next, the slider 56 of the core metal inserting/extracting device F 47 in the rotary die 45 is driven by the cylinder 59 to move the long tube 1 .
6 is held between the lower tangential part of the groove 48.48a of the bending die 42 and the groove 54.54a of the tube support part 55, and
The core metal 46.4 is placed inside the long tube from its tip.
6a, and then bend the end portions of the long tube-1 and Hl (the base of the bending allowance) into the grooves 48.48a of the bending die 42, the grooves 54.54a of the tube support part 55, and the fixed clamping die 7. Bend the long tube girder 6 held by the machined surface 44 of the mold 42.
By rotating the rotary die 45 along the grooves 48, 48a by the rotation of the rotary shaft 52 driven by the drive unit, the long pipes W, W, are bent into a U-shape. be.

During this bending process, the rotary mold 45 of the pipe bending device 4
must be rotated slightly more than the normal bending angle in order to take into account the spring bag phenomenon of the long pipes W, W, but in such a situation, the fixed tightening type in the pipe delivery word W3 7 is arranged in front of the movable clamping die 6 in the pipe delivery direction, so even if the long pipes W, W, have a long bending length, the movable clamping die 6 can be movably clamped as needed. By moving the mold 6 backward, collision of the rotary mold 45 with the movable tightening mold 6 can be avoided.

Next, by moving the movable clamping die 6 backward, the advancing/retracting mechanism section 35 is moved backward by the bias of the spring 39 attached to the vertically movable body 32, and thereby the tube feeding small body 34 is moved backward. After that, the bent pipes PI and P2 are cut by the rotary cutting instrument 5.

Next, the guide rod 21.21a is moved forward in the tube feeding direction by driving the drive section 23 of the protruding rod delivery mechanism section 19, and the protruding rod is moved through the frame 24 fixed to the tip of the cough guide rod 21.21a. 25.25a is moved forward, so that the protruding rod 25.25a is inserted into the through hole 41.41a of the fixed clamping mold 7.
Then, the bending tubes P, P, which are inserted into the through holes 49, 49a of the bending die 42 and are in a crimped state with the bending die 42, are released from the bending die 42.

Therefore, when the fixed clamping die 7 is disposed behind the movable clamping die 6, in order to avoid the collision between the fixed clamping die 7 and the rotating die 45 described above, the fixed clamping die 7 and movable tightening type 6
In this case, the length of the protruding rod 25.25a in the protruding rod delivery mechanism section 19 must also be increased, and the bending pipe P+, P
When the protruding rod 25.25a is removed, buckling occurs due to the elongated shape of the protruding rod 25.25a, and the protruding rod 25.25a must be replaced each time.

Therefore, by disposing the fixed clamping mold 7 in front of the movable clamping mold 6 in the pipe delivery direction, the movable clamping mold 6 and the rotating mold 4
5 and buckling of the protruding rod 25.25a, and since the movable clamping die 6 is not placed in front of the fixed clamping die 7, the movable tightening die 6 can be moved forward and backward. Guide bar 16.16a % guide rod 21.21
This makes it possible to avoid troubles caused by chips generated during cutting of the long pipe Wt adhering to the sliding members such as a.

By continuously sending, bending and cutting the long pipes 1 and 2 to the pipe bending device W4, a plurality of bent pipes P,
. Just before this, a lubricating fluid with a predetermined pressure is introduced into the long pipes W, Wt from an oil spout of a hydraulic device connected to the end of the long pipe h, and the bent pipe P is ,,
When cutting P, chips adhering to the inner surface of the tip of the long pipe 6 to be bent next are removed by flowing out.

〔Effect of the invention〕

In short, the present invention bends and cuts a long pipe Wt to form a short bent pipe P from a long pipe W, Wt.
In the cant-off bender 1 that continuously manufactures a plurality of pieces of Pl, a means is provided for introducing a lubricating fluid from the ends of the long tubes W, , W, just before the bending process is started. When cutting the bent pipes P, P, it is possible to flow out and remove the chips adhering to the inner surface of the tip of the long pipe to be bent next. Compared to a method for removing chips that connects the air outlet of a compressor, chips can be completely removed from the inner surfaces of the long pipes W+ and L due to the viscosity and flow action of the lubricating fluid.

Therefore, it is possible to dramatically reduce the incidence of defective products due to chips caused by the pressing of the core metal into the inner surface of the long tube during bending, and to improve production costs.

In addition, the hydraulic equipment that squirts lubricating fluid is a hydraulic pump,
Since a series of hydraulic circuits are constructed using motors, tanks, piping, etc., it does not require as much power as compared to the method of blowing out with an air compressor, and its pressure, flow rate, etc. can be easily adjusted. It is.

Furthermore, during bending, this lubricating fluid forms an oil film on the inner surface of the long pipe 6, so there is no need to squirt lubricating oil from the core metal when inserting the core metal, unlike in the past. The practical effects are enormous, such as eliminating the need to install necessary equipment.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view of a cant-off bender according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is a front view of the same, and FIG. 1 is an A-A sectional view, FIG. 5 is a top view of the same, FIG. 6 is a side view of the same, and FIG.
The figure is a BB arrow view of Fig. 1, Fig. 8 is a plan view of the same, and Fig. 9 is a plan view of the same.
The figure is a side view of the same as above, FIG. 10 is a plan view showing the main parts of the core metal insertion/extraction device, FIG. 11 is a side view of same as above, FIG. FIG. 14 is a plan view showing the moving state of the device, and FIG. 14 is a side view of the same. 1 Kaft-off bender W, wz long pipe Pl
, P2 bent pipe 4th prisoner Figure 5 Figure 6 Figure 8 Figure 7 Figure 12

Claims (1)

[Claims] In a cut-off bender that continuously manufactures a plurality of short bent pipes from a long pipe by bending and cutting the long pipe, there is a A cut-off bender characterized by having a means for introducing a lubricating fluid.