JPH08132155A - Vent pipe and its manufacturing equipment - Google Patents

Abstract

(57) [Summary] [Purpose] When it is necessary to manufacture a vent pipe by tightening the flange, and when finishing the outer wall of the end part etc. smoothly, after tightening once, push this inward. By finishing with, the manufacturing efficiency of the entire vent pipe is improved while ensuring the sealing property at the time of internal fitting. [Structure] Flange is integrally formed on the joining line,
A vent pipe in which flanges are fastened to each other and at least an end in the pipe length direction of the fastening part is formed inward. Equipped with a cored bar having a shape that substantially matches the inner shape of the end of the work that has been tightened, the cored bar is divided into a plurality of cored bars, and a part of the cored bar is pressed out to be pressed against the inner wall of the work, A groove for escaping the winding tightening portion is formed on the outer wall of the core metal, and a pusher for pressing the winding tightening portion of the work toward the groove is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vent pipe used in, for example, air conditioning equipment, and to an apparatus for manufacturing the vent pipe. Here, the vent pipe refers to a pipe for sending air for the purpose of ventilation or the like. Therefore, the concept includes both a straight straight tube and a curved curved tube.

[0002]

2. Description of the Related Art Conventionally, as one method of manufacturing a vent pipe of this kind, a work having a shape divided by a joining line along the pipe length direction is tied together and the joining line is welded to complete the vent pipe. Was being done. That is,
Taking a curved vent pipe as shown in FIG. 12 as an example, workpieces (c) and (d) having a shape divided into two at the joining line of the inner peripheral wall (a) and the outer peripheral wall (b) are manufactured, This work (c) and (d) were tied together and the joining line was welded. In this way, the vent pipe can be manufactured even when it has a complex shape having a curved portion in a part thereof.

[0003]

However, the conventional welding method as described above requires manual work and requires skill, so that there is a limit to improving the production efficiency and the cost is low. Expensive. Further, welding causes the works (c) and (d) to be burned to deteriorate the appearance, and even if the work is restored by painting, the cost is high.

Therefore, flanges are integrally formed on the joining lines of the workpieces, and the flanges are wound and joined to each other, thereby eliminating the need for welding work, promoting the automation of the production of the vent pipe, and improving the appearance. It can be thought of as a beautiful finish. However, this causes a problem when the end portion is internally fitted to another vent pipe. That is, in such a case, the outer wall at the end of the vent pipe cannot be fitted into another vent pipe unless the outer wall is finished smoothly.

The present invention has been made paying attention to such a point, and an object thereof is to manufacture the vent pipe by winding the flange as described above, and to manufacture the vent pipe and the outer wall of the end portion. When it is necessary to finish smoothly, etc., after tightening once, push it inward to finish, thereby increasing the manufacturing efficiency of the entire vent pipe while ensuring the sealing performance etc. It is in.

[0006]

To achieve the above object, the first aspect of the present invention is directed to a vent pipe joined by a joining line along the pipe length direction, and flanges are integrally formed on the joining line. Is fastened, and at least an end portion in the pipe length direction of the fastened portion is formed inward.

A second aspect of the present invention is directed to the vent pipe manufacturing apparatus according to the first aspect, and is provided with a cored bar having a shape substantially corresponding to the inner shape of the end portion of the work that has been wound and tightened, and the cored bar has a plurality of cores. It is divided into gold parts, and part of it is pushed out so that it can be pressed against the inner wall of the work, and on the outer wall of the core metal, a groove for letting the winding tightening part escape is formed, This is a configuration in which a pressing metal that presses toward the groove is provided.

[0008]

According to the first aspect of the present invention, there is no welding work. In addition, the tightness of the vent pipe itself is secured by the tightening process. Moreover, since the end tightening portion is formed inward,
It is possible to fit the inside of another vent pipe while ensuring the sealing property.

According to the second aspect of the present invention, the end portion of the work that has been wound and tightened is externally fitted to the cored bar, and a part of the cored bar is pushed out and pressed against the inner wall of the work. Next, when the winding tightening portion of the work is pressed by the presser, the winding tightening portion escapes into the groove and is pushed inward of the work, and the work outer wall becomes smooth.

[0010]

EXAMPLES Examples will be described below. As shown in FIG. 11, the vent pipe V of the embodiment has diameter-reduced straight portions S on both ends.
It is a curved pipe having a and Sb, and is joined at its inner peripheral wall and outer peripheral wall by a joint line provided along the pipe length direction. That is, in each of the two divided works L and R, the flanges Lf and Rf are integrally formed near the joining line, and the flanges are fastened together. Then, both ends Ma and Mb of the winding tightening portion in the pipe length direction are pushed inwardly of the work, so that the work outer wall is formed smoothly.

In the works L and R, first, the winding and tightening portion is processed to integrate the two, and then both end portions Ma and Mb thereof are pressed. Explaining the outline of the processing of the winding tightening portion, first, the works L and R are tied together as shown in FIG. 9, and as shown in FIG. Insert the flange Rf. Next, as shown in FIG. 6, both flanges Lf and Rf are bent by about 45 degrees in the second roller set and are tilted. Then, as shown in FIG. 7, both flanges Lf, R are formed in the third roller group.
Bend f further by about 45 degrees and completely defeat it. Then,
As shown in FIG. 10, the tightening portion is formed.

Next, the pushing process of both ends Ma and Mb will be described. 1 to 4 show a main manufacturing apparatus Y that performs this pressing process. In these figures, 101 is a gate-shaped frame, and the gate-shaped frame 101 has a cored bar having a shape substantially corresponding to the inner shape of the diameter-reduced straight portion Sa or Sb of the work L, R that has been wound and tightened. 110 is supported via a cushioning member so that it can be slightly moved in the vertical direction. The core metal 110 is divided into three core metal parts. That is, 111 is a main metal core, the inside of which is formed into a hollow, and the hollow portion is open to both sides and rear. Reference numeral 112 is a left core metal, and 113 is a right core metal, which are arranged on the left and right sides of the main core metal 111, respectively, and inside each core metal 112, 113, a slanted surface is formed inside. Cam members 122 and 123 are attached, the cam members 122 and 123 are fitted into the hollow portion of the main core metal 111, and their slopes face each other. Reference numeral 125 is a press member having two inclined surfaces fixed at an acute angle to the tip, and the inclined surfaces penetrate into the hollow portion of the main core metal 111 from the rear such that the inclined surfaces come into contact with the inclined surfaces of the cam members 122 and 123. This press member 125 is provided with a push rod 12 that is reciprocally movable in the vertical direction via a link 126.
It is connected to 7. A connection fitting 129 is fixed to the upper portion of the push rod 127, and a hydraulic press (not shown) is connected to the connection fitting 129. Therefore, as shown in FIG. 2, the diameter-reduced straight portion Sa or Sb of the work L, R that has been tightened by winding is connected to the main core bar 111 and the left and right core bars 1.
When the hydraulic press is operated by fitting it to 12,113,
The push rod 127 descends, the link 126 pivots, the press member 125 moves forward (moves downward in the plane of FIG. 4), and its slope pushes the slope of the cam members 122, 123 to move the cam members 122, 123. When pushed rightward and leftward, the left and right metal cores 112 and 113 squeeze out leftward and rightward, press against the inner wall of the work diameter reducing straight portion Sa or Sb, and can be reliably supported so as not to be deformed during the next processing.

On the upper surface and the lower surface of the main core metal 111, the winding tightening portion Ma of the work diameter reducing straight portion Sa or Sb,
Grooves 111a and 111b for letting Mb escape are formed. Further, 131 and 132 are an upper pusher and a lower pusher which are supported via a cushioning member so as to be slightly movable in the vertical direction above and below the main core bar 111. Molds 131a, 1 on the facing part
32a are respectively fixed, and when approaching to the main core metal 111, the winding tightening portions Ma and Mb of the work diameter reducing straight portion Sa or Sb are respectively connected to the grooves 111a and 111b.
It is designed to be pressed toward. Upper pusher 1
A connection fitting 133 is fixed to the upper surface of 31 and a hydraulic press (not shown) is connected to the connection fitting 133. Therefore, as described above, after the work diameter reducing straight portion Sa or Sb is supported by the core metal 110, when the connection fitting 133 is further pushed by the hydraulic press, the upper pressing metal 131 descends and the work diameter reducing straight portion Sa or Sb. Winding tightening part M
When the work core 110 contacts the work core metal 110 via a and Mb and descends, the work core metal 110 contacts the lower pusher 132 through the winding tightening portions Ma and Mb and further presses, As shown in FIG. 8, the winding tightening portion M
a and Mb lose the pressure and are pushed inward of the works L and R and escape to the grooves 111a and 111b, the work outer wall becomes smooth and the pushing process is completed, and the vent pipe V shown in FIG.
Is completed. After that, if the hydraulic press is retracted upward, the upper presser bar 131, the core bar 110, and the lower core bar 132 return to their original positions by the action of a set spring (illustration core omitted), etc. Clearance can be made, and the core metal 110 and the left and right metal cores 112, 11 are also operated by the action of a set spring (core not shown) in the metal core 110.
Since 3 returns to the original position, the works L and R can be taken out.

Therefore, in the above embodiment, the flanges Lf, Rf integrally provided on the mating surfaces of the works L, R are provided.
Since the welding is performed by tightening and joining, the vent pipe V can be manufactured without the need for welding work, the production efficiency can be improved, and the appearance can be finished neatly. Further, the tightness of the vent pipe itself is secured by the winding tightening process, and moreover, by the simple process of pushing inward, the winding tightening part Ma of the work diameter reducing straight part Sa or Sb,
Mb can be pushed in, and when it is fitted in another vent pipe, it can be connected with increased adhesion.

Further, after the winding is once tightened, the winding parts Ma and Mb are pushed inward for finishing, thereby improving the flow of the whole work processing mainly including the winding processing and producing the entire vent pipe. The efficiency can be improved. Moreover, since the work diameter reducing straight portion Sa or Sb is externally fitted to the core metal 110, the left and right metal cores 112 and 113 are pushed out, press-contacted to the inner wall of the diameter reducing straight portion Sa or Sb, and then pressed. The tightening portions Ma and Mb can be pushed inward without deforming the works L and R.

In the above embodiment, the curved pipe having the straightened straight portions at both ends was described, but the present invention includes a bent pipe having an arbitrary shape, and therefore, a bent pipe having no straight straightened portion, or a straight pipe. Vent pipes without even parts and straight pipes with a straight overall shape are also applicable. In short, in a bent pipe joined by a joining line along the pipe length direction, flanges are integrally formed on the joining line, respectively, and the flanges are wound together, and at least the pipe tightening direction of the winding tightening portion. All bent pipes having an end formed inward are included. Further, in the manufacturing apparatus, the number of divisions of the cored bar is arbitrary, and the cored bar may not be divided into three as in the above-mentioned embodiment, and the point is that a part of the cored bar comes out and can be pressed against the inner wall of the work. It only needs to be configured. Further, it goes without saying that the number of grooves and the number of pushers also vary depending on the number and position of the bent fastening portions of the vent pipe.

[0017]

As described above, since the vent pipe of claim 1 is formed by winding the flanges together, it is possible to improve the production efficiency and reduce the cost by promoting the automation of the manufacture of the vent pipe. As well as being able to finish the appearance neatly without the need for welding work, because at least the end in the pipe length direction of the winding tightening part is formed inward,
Inner fitting can be performed with respect to another vent pipe while ensuring the sealing property.

In the vent pipe manufacturing apparatus according to the second aspect of the present invention, after the wire is once tightened, it is pushed inward to finish the work, thereby improving the flow of the whole work processing mainly for the tightening work. The overall production efficiency can be improved. Moreover, the end of the work is externally fitted to the cored bar, part of the cored bar is pushed out and pressed against the inner wall of the work, and then the work clamp is pressed against the winding tightening part to release the winding tightening part into the groove. Since it is pushed out inward of the work, the winding tightening portion can be pushed inward without deforming the work. Therefore, it is suitable as an apparatus for manufacturing the vent pipe according to claim 1.

[Brief description of drawings]

FIG. 1 is a front view of a manufacturing apparatus according to an embodiment,

[FIG. 2] Similarly, a left side view,

[FIG. 3] Similarly, an enlarged front view of the main part,

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a front view of the main part of the work showing the first stage of the winding tightening process,

FIG. 6 is a view corresponding to FIG. 5 in the second stage,

FIG. 7 is a diagram corresponding to FIG. 5 in the third stage,

FIG. 8 is a view corresponding to FIG. 5, showing pressing processing of the winding tightening portion,

FIG. 9 is a perspective view of the work before the tightening process,

FIG. 10 is a view corresponding to FIG. 9 after the tightening process,

FIG. 11 is a view corresponding to FIG. 9 after pressing the winding tightening portion,

FIG. 12 is a view corresponding to FIG. 9 showing a conventional vent pipe.

[Explanation of symbols]

 V Vent pipe Sa Reduced diameter straight portion Sb Reduced diameter straight portion Ma End winding tightening portion Mb Edge winding tightening portion L Work Lf Flange R Work Rf Flange Y Manufacturing device 110 Core bar 111 Main core bar 111a Groove 111b Groove 112 Left core metal 113 Right core metal 131 Pusher 132 Pusher

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F24F 13/02 E

Claims (2)

[Claims] 1. A vent pipe joined at a joining line along a pipe length direction, wherein flanges are integrally formed on the joining line, and the flanges are fastened together, and at least one of the fastening portions is wound. A vent pipe characterized in that the end portion in the pipe length direction is formed inward. 2. A cored bar having a shape substantially corresponding to the inner shape of the end of the work that has been tightened by winding is provided, the cored bar is divided into a plurality of cored bar parts, and a part of the cored bar is pushed out to the inner wall of the work. A groove for escaping the winding tightening portion is formed on the outer wall of the core metal while being configured to be press-contacted, and a presser for pressing the winding tightening portion of the work toward the groove is provided. Item 1. The vent pipe manufacturing apparatus according to Item 1.