JPH06210345A - Roll forming method and apparatus - Google Patents

Abstract

PURPOSE:To improve the watertightness of a caulked part and to prevent the caulked part from being loosed by inserting a thread like core material into an engaged part and caulking a folded piece and a convoluted piece which are engaged with each other with a caulking roller when the folded piece and the convoluted piece are engaged with each other. CONSTITUTION:First of all, the folded piece 11 is formed on one side edge of a strip metal 10 and the convoluted piece 12 is formed on the other side edge therefor by a group of embossing rollers 16. The strip metal 10 is coiled obliquely around a mandrel 13, while being pressed by a pressing plate so that the strip metal 10 is not expanded, the folded piece 11 and the next convoluted piece 12 are fit with each other. Before this engagement, the thread like core material 14 is supplied by a supply roller 17 to the convoluted piece 12, forced by an intruding roller 18 further into a U-shaped groove and the folded piece 11 is fit with the convoluted piece 12 into which the core material 14 is intruded. The fit piled part is caulked by the caulking roller 19 to form a wound tube. Since the core material 14 is inserted into the fit part in the wound tube formed in this way, the wound tube is caulked securely and prevents water from leaking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound tube molding method and apparatus used for a sheath such as prestressed concrete.

[0002]

2. Description of the Related Art Generally, as a sheath for inserting a tension material used for manufacturing a prestressed concrete structure,
Alternatively, a metal spiral wound tube is used as a cable insertion tube. Conventionally, this spiral wound tube is formed by crimping a metal spiral wound tube with a crimping roller or the like.

[0003]

By the way, in the above-described conventional winding tube, since the winding tube is formed only by the plastic deformation of the metals, there is a fear of water leakage or the like when it is long. . Moreover, there is a limit to increase the pressure for tightening the metal.

An object of the present invention is to solve the above-mentioned conventional drawbacks, and to provide a winding tube molding method and apparatus for improving the watertightness of a caulking portion and preventing the caulking portion from loosening. Especially.

[0005]

SUMMARY OF THE INVENTION A winding pipe manufacturing apparatus according to the present invention includes a molding step of forming a folding piece on one side edge of a metallic strip and a folding piece on the other side edge, and the shaped strip shape. Inserting the filament core material into the fitting part when the folding piece and the folding piece are fitted to each other and spirally wound around the core metal to form a tubular shape, and when the folding piece and the folding piece are fitted together. The winding tube manufacturing method is characterized by comprising a step and a step of crimping a folded piece and a folded piece that are fitted to each other with a crimping roller.

[0006] Further, a group of shaping rollers forming a folding piece at one side edge and a folding piece at the other side edge of the metallic strip material, and the strip material shaped by the shaping roller group, the folding piece and the folding piece. A core metal that fits and is wound in a spiral,
A roller that supplies the filamentous core material to the fitting portion of the folding piece and the folding piece, a pushing roller that pushes the supplied filamentous core material into the fitting portion, and a roller that contacts the outer surface of the core metal and fits together. And a crimp roller for crimping the folded piece and the folded piece.

[0007]

As described above, according to the winding tube forming method and the apparatus thereof according to the present invention, since the thread material such as cotton is built in the crimping portion of the winding tube, the crimping can be performed reliably and at the same time. The watertightness of the part can be improved.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an enlarged perspective view showing a main part of a winding tube manufacturing apparatus used in a winding tube forming method according to an embodiment of the present invention, and FIG. 2 is used in a winding tube forming method according to an embodiment of the present invention. FIG. 3 is a perspective view showing a main part of the winding tube manufacturing apparatus, and FIG. 3 is a principle view showing a winding state of the winding tube manufacturing apparatus.

The winding tube molding method of the present invention uses the metallic strip 1
No. 0, a concavo-convex groove 10a is continuously formed, and a folding piece 11 is formed on one side edge and a folding piece 12 is formed on the other side edge, and a folding piece 11 of the banded material 10 and the folding piece 11 are folded. Step b, in which the insert piece 12 and the folding piece 11 are fitted together and spirally wound around the core metal 13 to form a tubular shape, and when the folding piece 11 and the folding piece 12 are fitted together, the filamentous core material 14 is inserted into the fitting portion. The process includes a process c and a process d in which the folding piece 11 and the folding piece 12 fitted with each other are crimped by a crimping roller 15.

In the imprinting step a, a plurality of rollers (not shown) of the imprinting roller group 16 continuously form the concave-convex groove 10a in the central portion of the metallic strip 10, and the folding piece 11 and the other end are formed at one edge. The folding pieces 12 are formed at the edges of the. The number of the concave and convex grooves 10a in the central portion can be appropriately selected from a single number and a plurality of numbers according to the application. The folding piece 12 has a substantially U shape, and the folding piece 11 is fitted in the U-shaped groove.

In the step b of spirally winding the metallic strip-shaped material into a tubular shape, the metallic strip-shaped material 10 is wound around the core metal 13. At this time, the folding piece 11 is wound so that the folding piece 11 fits in the groove of the folding piece 12. In the step b of inserting the filamentous core material 14 into the fitting portion, the filamentous core material 14 is supplied by the supply roller 17 and the pushing roller while the folding piece 11 and the folding piece 12 of the metallic strip 10 are fitted together. Push it further into the groove at 18.

In the crimping step d, the folding pieces 11 and the folding pieces 12 fitted with each other are crimped by the crimping roller 19 pressing the core metal 13. The caulking roller 19 has two stages or three stages. As described above, according to the winding tube molding method of the present invention, the filamentous core material 14 can be inserted into the joint portion of the winding tube, and the thread can be reliably tightened. The filamentous core material 14 is
For example, octopus yarn, cotton yarn, synthetic fiber (monofilament or twisted yarn) and the like can be used.

Next, a roll forming apparatus used in the roll forming method of the present invention will be described. The winding tube forming apparatus includes a group of molding rollers 16 that forms a folding piece 11 on one side edge and a folding piece 12 on the other side edge of the metal strip material 10, and a metal strip material molded by the molding roller group 16. A core metal 13 for winding 10 in a spiral shape by fitting the folding piece 11 and the folding piece 12 together, and a supply roller 17 for supplying a filamentous core material 14 to the fitting portion of the folding piece 11 and the folding piece 12. ,
A pushing roller 18 for pushing the supplied filamentous core material 14 into the fitting portion, and a crimping roller 15 for crimping the folding piece 11 and the folding piece 12 which are in rolling contact with the outer surface of the core metal 13 and are fitted to each other. Is equipped with.

Here, the embossing roller group 16 continuously forms an uneven groove 10a in the central portion of the metallic strip 10 by a plurality of rollers (not shown), and has a folding piece 11 at one edge and the other. A convolution piece 12 is formed at the edge. The cored bar 13 has a columnar shape having a collar portion (not shown), is rotationally driven by a drive source such as a motor, and is supported by a bearing. A caulking roller 19 is arranged around the core metal 13. Caulking roller 1
9 has a plurality of caulking grooves on its outer periphery and is driven by a drive mechanism (not shown). The contact angle and contact pressure of the caulking roller 19 with respect to the core metal 13 can be freely adjusted by the left and right screws and the front and rear screws.

Next, a method of using the winding tube manufacturing apparatus configured as described above will be described. First, the folding roller group 16 is used to form the folding piece 11 on one edge of the metallic strip 10 and the folding piece 12 on the other edge thereof. Folding piece 1 on one side edge
1 is a metallic strip having a convoluted piece 12 formed on the other side edge.
0 is wound obliquely around the cored bar 13 while being pressed by a swelling pressing plate (not shown) so as not to swell upward. As shown in FIG. 3, the wound metal strip 10 is fitted with the folded piece 11 and the next folded piece 12. Prior to this fitting, the filament core material 14 is supplied to the convolution piece 12 by the supply roller 17. The supplied filamentous core material 14 is
It is further pushed into the U-shaped groove by the pushing roller 18. The folding piece 11 is fitted into the folding piece 12 into which the filamentous core material 14 has been pressed.

The overlapped portion fitted is the guide roller 2
Tilted by zero. The inclined overlapping portion is crimped by a crimping roller 19 as shown in FIGS. At this time, the caulking roller 19 is inclined according to the winding angle of the metallic strip 10. Further, the caulking roller 19 can be moved and adjusted in the longitudinal direction of the cored bar 13 on a table formed in a dovetail groove shape (not shown) by left and right screws. Further, it can be moved back and forth according to the diameter of the winding tube formed by the front and rear screws.

The overlapping portion tightened by the tightening roller 19 has the thread-shaped core material 14 sandwiched therein, and the overlapped portion shown in FIG.
As shown in FIG. 4, fine irregularities 21 are formed on the surface. The overlapping portion of the metallic strip 10 on which the unevenness 21 is formed is
Further caulking is performed by another caulking roller arranged around the cored bar 13. Since the groove is formed on the pressure contact surface of the caulking roller, the unevenness 21 formed in the overlapping portion is once flattened. The once flattened unevenness 21 is further crimped by another crimping roller. The tightened overlapping part is
It becomes slightly rounded and fine irregularities are formed again.
FIG. 3 is a principle view showing a crimped state of the winding tube manufacturing apparatus of the present invention.

In the wound tube thus formed, the filamentous core material 14 is sandwiched in the fitting portion, so that it can be securely crimped, and water leakage does not occur even if it is formed longer than in the conventional case.
The present invention is not limited to the above embodiments, and various design changes can be made based on the technical idea of the present invention.

[0019]

As described in detail above, according to the wound tube molding method of the present invention, there is a molding step of forming a folding piece on one side edge of the metallic strip and a folding piece on the other side edge thereof. A step of spirally winding a folded piece and a folded piece of the shaped band-shaped material around a core metal while fitting the folded piece into a tubular shape,
When fitting the folding piece and the folding piece together, the step of inserting the filamentous core material into the fitting part, and the step of crimping the folding piece and the folding piece fitted with each other with the crimping roller,
The fitting portion can be securely tightened and the watertightness can be improved. Therefore, the wound tube manufactured by the wound tube molding method of the present invention has no risk of water leakage.

Further, a group of forming rollers forming a folding piece on one side edge and a folding piece on the other side edge of the metallic strip material, and the strip material formed by the forming roller group on the folding piece and the folding piece. A core metal that fits and is wound in a spiral,
A roller that supplies the filamentous core material to the fitting portion of the folding piece and the folding piece, a pushing roller that pushes the supplied filamentous core material into the fitting portion, and a roller that contacts the outer surface of the core metal and fits together. Since the folded piece and the crimping roller for crimping the folded piece are provided, the wound tube molding apparatus of the present invention can manufacture a wound tube having excellent water tightness.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view showing a main part of a winding tube manufacturing apparatus that is an embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of a winding tube manufacturing apparatus showing an embodiment of the present invention.

FIG. 3 is a principle view showing a winding state by a winding device manufacturing apparatus which is an embodiment of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing a state in which the metallic band-shaped material fitted by the winding tube molding method and apparatus of the present invention is caulked.

[Explanation of symbols]

 10 Metal Bands 11 Folding Pieces 12 Folding Pieces 13 Core Bars 14 Filiform Core Materials 15 Caulking Rollers 16 Typing Rollers 17 Supply Rollers 18 Pushing Rollers 19 Caulking Rollers 20 Guide Rollers

Claims (2)

[Claims] 1. A molding step of forming a folding piece on one side edge and a folding piece on the other side edge of the metallic strip, and fitting the folding piece and the folding piece of the shaped strip to each other. A step of spirally winding a core metal into a tubular shape; a step of inserting a thread-shaped core material into a fitting part when fitting a folding piece and a folding piece; and a folding piece and a folding piece that are fitted to each other. A method for forming a wound tube, comprising: 2. A group of shaping rollers for forming a folding piece on one side edge and a folding piece on the other side edge of the metallic strip material, and a strip material shaped by the shaping roller group for the folding piece and the folding piece. A core metal that fits and is wound in a spiral shape, a roller that supplies a filamentous core material to a fitting portion between a folding piece and a folding piece, and a pressing roller that pushes the supplied filamentous core material into the fitting portion, A winding tube manufacturing apparatus, comprising: a folding piece rollingly contacted with an outer surface of the core metal and fitted into each other, and a crimping roller for crimping the folding piece.