JPH07256345A - Tube bending method and guide device for tube to be bent used in the method - Google Patents

Abstract

PURPOSE:To obtain the tube bending method to precisely bend a tube to be bent and the guide device of bending machine provided on the machine for the bending method. CONSTITUTION:The guide device 10 which is provided with a hydraulic cylinder 4 for bending to drive a bending die and a pair of receiving shoes 5, 5, and is arranged to at least one side of a tube to be bent inserted to a tube bending machine having a bending die 3. The guide device 10 is constituted of split type upper/lower engaging shoes 11, 12 arranged with semicircular inner collar pieces 112, 122 inside a main body having horizontal outer collars 111, 121 to clamp the tube to be bent, these upper/lower engaging shoes is connected by a tightening tool 16, a level gage is provided to horizontal inner collars 111, 121. By this method, while always confirming a level condition of the tube to be bent, precise tube bending is executed. Also, confirmation of horizontally positioning state of the tube to be bent placed between the receiving shoe and bending shoe is easily executed, not requiring skill, a bent tube of good precision is produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is equipped with a pipe bending method for accurately bending a processing pipe with a pipe bending machine and a hydraulic cylinder, and a pipe bending machine of this pipe bending method.
In addition, the present invention relates to a guide device for a pipe bending machine which is provided near at least one side of the processing pipe.

[0002]

2. Description of the Related Art As is well known, as a device for processing a machined pipe into an appropriately curved surface, a pipe bending machine, an oil bender for pipe body bending (hereinafter referred to as a pipe bending machine), and a hydraulic cylinder. There is known a method of bending a pipe by utilizing. Then, in these pipe bending methods, the tip surface of the piston rod of the hydraulic cylinder is brought into contact with the bush surface of the bending die (push die) provided in the bender frame to advance the piston rod and to receive the receiving piece (roller, receiving die). The bending of the processed pipe is performed through the holding of the processed pipe by the mold. Further, in the pipe bending method, the structure for gripping the processing pipe is such that the processing pipe is loosely arranged between the receiving piece and the bending die. As a result, the working pipe blindly moves between the receiving piece and the bending die, and accurate pipe bending cannot be performed, or indentations, wrinkles, and the like, and defective products are manufactured due to this, which is extremely Be unreasonable,
Alternatively, there is a problem that a high degree of skill is required for avoiding the defective product and manufacturing a high-quality processed pipe.

Further, as described above, the structure for gripping the working pipe is such that the working pipe is loosely arranged between the receiving piece and the bending die. As a result, the working pipe rolls, rotates, or blindly moves between the receiving piece and the bending die, resulting in a very unstable situation. In the situation described above, it is often the case that accurate pipe bending cannot be performed by normal operation or work, and quality deterioration, generation of defective products or waste of material, and extra work such as correction work are required. There are many issues, such as Incidentally, the following invention is found as a prior art to cope with this. (1) There is a cold bender for pipe bending of Japanese Utility Model Publication No. Sho 63-31776. The configuration is a technical content in which a pair of receiving molds that come into surface contact with the outer surface of the working pipe move as the working pipe is processed. (2) Actual Kaihei 4
There is a -113111 pipe bending machine. The structure is such that a pair of receiving molds is provided so as to be movable relative to each other. (3) There is a pipe bending machine of Japanese Utility Model No. 58-128713. The structure is such that a pair of rollers are provided slidably in the radial direction. (4) Actual Kaihei 3-51917
There is a press bending device of No. The structure is such that a pair of support arms for supporting the processing pipe are provided swingably.

[0004]

SUMMARY OF THE INVENTION In the method for pipe bending by pressing the bush surface having the unevenness of the bending die with the tip end surface of the piston rod and slidingly moving the bending die, which is detailed above, Accurate and horizontal sliding of the bending die cannot be expected. In particular, if the above-mentioned processing method and the processing method in which at least one side of the processing tube is not provided with a horizontal holding device, the bending die accurately and smoothly holds the processing tube. There is no guarantee that it will be transferred, accurate pipe bending cannot be performed, or accurate pipe bending requires extremely advanced skill, and accurate pipe bending cannot be performed efficiently, There are issues such as.

The prior art described in detail above has a feature that the working pipe can be held in a stable state inside the pipe bending machine. However, if the length of the processing pipe is long (long),
The simple regulation of the receiving piece and the bending die is not sufficient, and stable installation of the entire working pipe cannot be secured. Specifically, there are risks such as rolling or blind movement due to the location of the processed pipe that is not sandwiched between the receiving piece and the bending die, and that accurate pipe bending cannot be performed. There is. Further, accurate pipe bending by these devices still requires considerable skill as in the past. In particular, the horizontal state of the receiving piece, in other words, the horizontal state of the processing pipe with respect to the installation surface cannot be grasped, and the accurate pipe bending process cannot be achieved, or there are many problems in terms of rationality and workability. There is.

Particularly, a high level of skill is required in the horizontal installation work of the processing pipe, such as confirmation of the horizontal installation condition of the processing pipe once installed between the receiving piece and the bending die, or correction to the horizontal installation. Is similar to the conventional one and is considered to be one of the issues.

[0007]

In view of the above, the present invention provides
Achieving a smooth and accurate transition of the bending die, and thereby performing an accurate pipe bending process. Also, through the smooth transition of the bending die and horizontal installation of the processing pipe, accurate pipe bending can be performed without skill. The following configurations are adopted for the purpose of being achieved.

That is, the pipe bending method of the present invention is a pipe bending method in which a pipe bending machine and a hydraulic cylinder are used to bend the pipe, and the processed pipe is slidable in the bender frame of the pipe bending machine. A horizontal supporting step for horizontally setting the bending die, the receiving piece, and the horizontal holding device for the pipe, and the bush of the bending die for abutting the processing pipe mounted in the horizontal state through the horizontal supporting step. The surface contact step of pressing the piston rod having the flat tip portion of the hydraulic cylinder against the flat surface portion provided on the end surface of the hydraulic cylinder to make the surface contact between the flat surface portion and the flat tip portion, and held by this surface contact step In the state where the flat surface portion and the flat tip portion are in surface contact with each other, an accurate forward movement of the piston rod and the bending die and a forward movement step for horizontal sliding are performed, and a straight line is applied to the working pipe through the forward movement step. And a processing step of subjecting the pipe bending precision, in constructed.

Another object of the present invention is to achieve accurate pipe bending while grasping the horizontal state of the processed pipe, and to confirm the horizontal installation state of the processed pipe accurately without requiring any skill. The following configuration is adopted as

That is, the processing pipe guide device used in the pipe bending method of the present invention is inserted into a pipe bending machine having a bending die, a hydraulic cylinder for pushing and bending for driving the bending die, and a pair of receiving pieces. A guide device provided on at least one side of a processing pipe provided, wherein the guide device comprises:
It is composed of a split type vertical locking piece provided with a semi-circular inner flange piece inside a main body having a horizontal outer flange piece for holding the processing pipe, and the vertical locking pieces are connected by a tightening tool. At the same time, the horizontal level is provided on the horizontal inner flange pieces of the upper and lower locking pieces.

[0011]

The function of the present invention will be described below. First, with the hydraulic cylinder retracted, insert the processing pipe between the bending die and the pair of receiving pieces in the retracted limit (usually, between the processing pipe and the bending die and the pair of receiving pieces). I have a lot of room.) Then, on at least one side of the working pipe,
And, a guide device (other horizontal holding device is also possible) is set at a position slightly apart from the pipe bending machine.

In the set, when the upper and lower locking pieces are loosened by releasing the tightening tool, they are fitted from the end surface of the processing pipe and moved to the set position, and the tightening tool is tightened. While being fixed to the set position, a horizontal outer brim piece of the lower locking piece is provided on the installation surface, and the vertical locking piece and the pipe bending machine are held in a horizontal state (including a substantially horizontal state). In this way, when the guide device is set on one side of the processing pipe, it is desirable to secure an installation surface (table, table, paddle "table", etc.) at the same height on the other side (guide). Needless to say, if the device is on both sides). Then, it is confirmed whether or not the inner brim pieces of the upper and lower locking pieces are chucking the working pipe correctly. At this time, if the horizontal outer brim piece of either the upper locking piece or the lower locking piece attached to the installation surface is not correctly installed on the installation surface, use a pipe wrench / plier or hand. The operation is performed so that any one of the horizontal outer flange pieces is properly installed (in other words, installed in a close contact state) by sandwiching the processing pipe, and the next work is started in the situation where the above-mentioned correct installation is performed.

When the upper and lower locking pieces and the working pipe are installed as described above, the hydraulic cylinder is advanced and the flat tip of the piston rod of the hydraulic cylinder is moved to the flat surface of the bending bush. The surface of the bending die is brought into surface contact with and the bending die at the backward limit is successively advanced in the state of surface contact. At this time, since the flat tip portion of the piston rod presses the flat surface portion of the bending die, a pressing force in a substantially direct direction (referred to as the forward direction of the piston rod) is applied to the bending die. A direct transfer of the bending mold is guaranteed. Then, through the linear (forward movement and horizontal sliding) transition of the bending die, accurate pipe bending by the bending die and the receiving piece is guaranteed. Specifically, during this work, while confirming the transition of the bending die in the linear direction,
While constantly watching the leveler to see the movement of the guide device which moves little by little, it is confirmed whether or not the processing pipe is maintained in a horizontal state. Through the smooth and accurate transition of the bending die and the guide device. Accurate tube bending is achieved (via visual inspection of the working tube orientation and through the transition of the bent tube). Of course, if the level is confirmed and the horizontal state is not secured, the bending die is temporarily retracted, and the setting work, confirmation work or correction work (correction work with a pipe wrench, pliers, etc.) and pipe bending work are performed again. Do the work. When the pipe bending process of the processed pipe is completed by performing the above-mentioned operations, for example, first the hydraulic cylinder and the bending die are retracted from the forward limit, the processed curved pipe is released, and then the upper and lower locking pieces are released. Release the tightening tool and remove or divide the loose upper and lower locking pieces to remove them from the processed bent pipe. As a result, a series of processing operations are completed, and a bent pipe having an accurate bend is manufactured.

The operations and procedures detailed above are, of course, the most general examples of operations and procedures. Therefore, the use having the same handling and function is naturally included in the technical content (content of right) of the present invention.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a known pipe bending machine,
Has a bender frame 2, a bending die 3, a hydraulic cylinder 4, and a pair of receiving pieces 5 and 5 as main constituent elements.
In the figure, A is a processing pipe.

First, the bending die 3 will be described. The bending die 3 holds the processing pipe A and a hold curved surface 31.
And a bush 33 provided on the pressing surface side of the curved surface main body 32. The end surface of the bush 33 is a flat surface portion 33a (the flat surface portion 33a is an existing structure provided in advance on the end surface of the bush 33,
It is also possible to use any processing structure for performing various processing such as polishing and polishing. ), And the flat tip portion 41a of the piston rod 41 of the hydraulic cylinder 4 is brought into contact with the flat surface portion 33a in a surface contact state. Therefore, as mentioned above, a smooth and accurate transfer of the bending die 3 is ensured via the surface contact. When the inner surface of the hold curved surface 31 is not formed with an accurate (fine) surface and / or curved surface, various processes such as polishing are performed.

Next, the guide device 10 will be described.
The guide device 10 includes an upper locking piece 11 having a horizontal inner and outer outer brim pieces 111 and 112 having a confronting shape and a united brim piece 113 having a semi-circular arc-shaped inner brim piece 112, and the horizontal inner and outer outer brim pieces 1.
21 and 122 and a lower locking piece 12 having a united flange piece 124 having a semi-circular arc-shaped inner flange piece 123, and the upper and lower locking pieces 1
The level gauge 13 (level) provided on each of the horizontal inner collar pieces 111 and 121 of Nos. 1 and 12, and the pegs provided on the vertical locking pieces 11 and 12 for observing the level gauge 13 (checking the horizontal scale). The windows 14 and 15 are the main components. The upper and lower locking pieces 11 and 12 have their respective united brim pieces 113 and 12 respectively.
4 through the tightening tool 16 provided on the unit 4,
By combining 124, the two combined collar pieces 113,
124 is aligned, and a short tube portion B having a shape similar to that of the working pipe A is formed.

The leveling device 13 is provided by screwing 17 to the upper and lower inner collar pieces 111 and 121 (see FIG. 4).
(See FIG. 5), a method using the strip 17a (see FIG. 5), a method using the casing 17b and the screw 17 (see FIG. 6), and the like. Of course, the present invention is not limited to the above-mentioned examples, and a method or device for making the leveler 13 replaceable can be considered. Any attachment method or device is possible.

[0019]

As described above, the present invention is a method capable of smoothly and accurately transferring a bending die. Therefore, a bent pipe with good working accuracy can be easily and quickly processed without further advanced skill, or High quality bent pipe without wrinkles and indentations can be manufactured. It is also a great help to improve rationality and workability.

Further, according to the present invention, at least one side of the processing pipe slightly separated from the pipe bending machine is formed by the inner flange piece of the upper and lower locking pieces having the horizontal inner flange piece provided with the leveler. Since it is configured to be held by the short tube portion, accurate pipe bending can be performed while always grasping and visually checking the horizontal state of the processing pipe,
Moreover, improvement of pipe bending accuracy can be expected. In addition, it is possible to easily check the horizontal installation status of the processing pipe once installed between the receiving piece and the bending die, or to simplify the horizontal installation status and correction work of the processing pipe such as correction to the horizontal installation. To be done.

[Brief description of drawings]

FIG. 1 is a plan view showing a usage state.

FIG. 2 is an enlarged perspective view showing a relationship between a bending die and a hydraulic cylinder.

FIG. 3 is a perspective view of a guide device.

FIG. 4 is a front view of a guide device.

FIG. 5 is a front view showing another example of a method of attaching the leveler to the horizontal inner flange piece.

FIG. 6 is a front view showing still another example of a method of attaching the leveler to the horizontal inner flange piece.

[Explanation of symbols]

 1 Pipe Bending Machine 2 Bender Frame 3 Bending Die 31 Hold Curved Surface 32 Curved Body 33 Bushing 33a Flat Surface 4 Hydraulic Cylinder 41 Piston Rod 41a Flat Tip 5 Receiving Piece 10 Guide Device 11 Upper Locking Piece 111 Horizontal Outer Collar Piece 112 Inside Collar piece 113 Combined collar piece 114 Through hole 12 Lower locking piece 121 Horizontal outer collar piece 122 Inner collar piece 123 Combined collar piece 13 Leveler 14 Sighting window 15 Sighting window 16 Tightening tool 17 Screwing 17a Belt 17b Casing A Processing tube B Short tube part

Claims (4)

[Claims] 1. A pipe bending method for performing a pipe bending process using a pipe bending machine and a hydraulic cylinder, wherein the processed pipe is slidably provided in a bender frame of the pipe bending machine and a holder. A horizontal supporting step of horizontally setting the bridge and the pipe by a horizontal holding device, and a flat surface portion provided on the end surface of the bending die bushing that is attached to the processing tube mounted in the horizontal state through the horizontal supporting step, A surface contact step of pressing a piston rod having a flat tip portion of the hydraulic cylinder to make a surface contact between the flat surface portion and the flat tip portion, and a surface of the flat surface portion and the flat tip portion held in the surface contact step. An advance step for achieving accurate forward transition and horizontal sliding of the piston rod and the bending die in a contact state;
A tube bending method comprising a step of accurately and highly accurately bending the tube through the advancing step. 2. A pipe bending method for bending a pipe by a pipe bending machine and a hydraulic cylinder, wherein a bending pipe and a holder are provided so that the processed pipe is slidably provided in a bender frame of the pipe bending machine. A horizontal supporting step of horizontally setting a bridge and a guide device for horizontally holding the pipe, and a flat surface portion provided on the end surface of the bending type bush that is abutted on the processing tube mounted in the horizontal state through the horizontal supporting step. A surface contact step of pressing a piston rod having a flat tip portion of the hydraulic cylinder to make a surface contact between the flat surface portion and the flat tip portion, and the flat surface portion and the flat tip portion held in the surface contact step. In the surface contact state, the piston rod and the bending die are accurately moved forward, and a horizontal sliding step is performed. In this forward step, the processing pipe is accurately and highly accurately bent. A pipe bending method that consists of the processing steps to be performed. 3. A guide device provided on at least one side of a working pipe inserted into a pipe bending machine having a bending die, a hydraulic cylinder for pushing and bending which drives the bending die, and a pair of receiving pieces. The guide device is composed of a split type vertical locking piece having a semi-arcuate inner flanged piece inside the main body having a horizontal outer flanged piece for holding the processing pipe, and the vertical locking piece A guide device for a processing pipe used in a processing method in which pieces are connected by a tightening tool, and a horizontal level is provided on the horizontal inner flange pieces of the upper and lower locking pieces. 4. The processing according to claim 1, wherein the leveling device of claim 1 is provided on each of the horizontal inner collar pieces of the upper and lower locking pieces, and the upper and lower locking pieces on which the leveling device is provided are provided with observing windows. A guiding device for processing pipes used in the method.