JP2002001417A - Continuously tube forming apparatus, continuously tube forming method using tube forming apparatus, grooved drum for tubular coil forming, and tubular coil forming method using grooved drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube forming apparatus capable of forming a coil of long sized tubes and to provide a grooved drum for tubular coil forming capable of easily picking up the tubular coil after forming. SOLUTION: In a continuously tube forming apparatus provided with a drawing equipment having a die and a floating plug, a tube bending process apparatus having a mandrel, integrated with the floating plug and the mandrel, the grooved drum for tubular coil forming is provided by winding a spring member in a coil like shape and compressing the spring member in the length direction, and by riding on the neighboring two spring member layers with a groove for forming dropped tubes in a coil like shape in the periphery of the compression body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous tube forming apparatus capable of forming a coil of a long tube, a continuous tube forming method using the above-described forming apparatus, and a tube coil forming capable of easily removing a formed tube coil. The present invention relates to a grooved drum for use and a method of forming a tube coil using the grooved drum.

[0002]

2. Description of the Related Art As shown in FIG. 8, a pipe forming apparatus has a mandrel 5 disposed inside a pipe 4 to continuously deform the pipe 4 while preventing deformation of the pipe 4. The grooved drum 2
This is a device for forming a tube coil by dropping it into the second spiral groove 23. In the above-described apparatus, the mandrel 5 is supported by the hydraulic cylinder 14 via a metal core 24 and
Numeral 2 is made of a block-shaped metal material such as iron, and its groove width is set as small as possible to the diameter of the tube 4 so that the formed tube moves back and forth in the spiral groove 23 and the coil pitch of the tube coil does not fluctuate. It is formed close to.

[0003]

In the conventional pipe forming apparatus, since the mandrel 5 is supported by the cylinder 14, a long pipe cannot be used as the pipe 4, and one short pipe cannot be used.
The productivity was inferior due to the single batch molding. Further, it is difficult for the conventional grooved drum 22 to take out the tube 4 dropped into the spiral groove 23 and formed into a coil shape. In particular, the flat tube coil has a large contact area with the inner surface of the spiral groove 23. In addition, the diameter was not easily expanded by springback, and it was difficult to remove the tube coil. SUMMARY OF THE INVENTION It is an object of the present invention to provide a continuous tube forming apparatus capable of forming a coil of a long tube, a continuous tube forming method using the forming apparatus, a tube coil forming grooved drum capable of easily taking out a formed tube coil, and An object of the present invention is to provide a method of forming a tube coil using the grooved drum.

[0004]

According to the first aspect of the present invention,
A continuous pipe forming apparatus comprising a drawing facility having a die and a floating plug, and a pipe bending facility having a mandrel, wherein the floating plug and the mandrel are integrated with each other. It is a molding device.

According to a second aspect of the present invention, the raw pipe is continuously drawn by a drawing facility having a die and a floating plug, and the drawn pipe is provided with a mandrel integrated with the floating plug inside thereof. This is a method for continuously forming a pipe, characterized in that the pipe is bent.

According to a third aspect of the present invention, a spiral groove for winding a spring material in a coil shape and compressing the spring material in a longitudinal direction, and adjoining the outer periphery of the compressed body with a spiral groove for dropping a tube and forming the coil shape. The grooved drum for forming a tube coil is provided so as to straddle two spring material layers.

According to a fourth aspect of the present invention, a circular tube is wound around the spiral groove of the tube coil forming grooved drum which has been decompressed, and then the grooved drum is compressed in the longitudinal direction to form the circular tube. A method for forming a tube coil, comprising forming a tube into a flat shape, and then releasing the compression of the grooved drum and removing the flattened tube from the grooved drum.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a continuous forming apparatus for pipes according to the present invention is used for forming (bending, etc.) a drawing equipment 3 having a die 1 and a floating plug 2, and a pipe 4. Tube 4 with mandrel 5 to prevent deformation
A continuous forming apparatus for pipes 4 provided with a bending processing equipment 6 of the above, wherein the floating plug 2 and the mandrel 5 are integrated. In FIG. 1, reference numeral 7 denotes a grooved drum having a spiral groove 12 for forming the tube 4 into a coil shape. In this molding apparatus, the mandrel 5 is integrated with the floating plug 2 locked on the die 1, and the tube 4 is supplied continuously by drawing the coil-shaped long raw tube 8 into the die 1. Therefore, the productivity of the tube coil is improved. here,
One in which the mandrel 5 and the floating plug 2 are connected by a universal joint or the like is also included.

The grooved drum according to the third aspect of the present invention is shown in FIG.
As shown in (a) to (c), the spring material 9 is wound into a coil to form a coil spring 10 having a predetermined pitch (FIG. 2A), and the coil spring 10 is compressed in the longitudinal direction to form a compression body 11. (FIG. 2B), and a spiral groove 12 is provided on the outer periphery of the compression body 11 so as to extend over the two spring material layers 13 (FIG. 2C).

The grooved drum 7 is compressed in the longitudinal direction by a hydraulic cylinder 14 of a coil forming machine shown in FIG. 3A, and a flat tube 15 is dropped into a spiral groove 12 of the compressed grooved drum 7. Thus, the flat tube coil 16 is formed.
When the compression is released after the molding, the groove width of the grooved drum 7 is increased (w ′> w) and the diameter of the drum is reduced (d ′ <d) as shown in FIG. Is separated from the inner surface of the spiral groove 12, and the flat tube coil 16 can be easily taken out from the grooved drum 7. In addition, FIG.
(B) is an enlarged explanatory view of the helical groove 12 of FIGS. 3 (a) and 3 (b), respectively, so that the above situation can be better understood.

In the coil forming machine, the grooved drum 7 is set in the gap between the drum clamp 17 and the flange 19 of the drum shaft 18 as shown in FIG. The flat tube 15 is compressed in the spiral groove 12 of the grooved drum 7 by the drive gear 20.
Thus, the flat drum coil 16 is formed by dropping the grooved drum 7 while rotating it forward. Next, as shown in FIG. 3B, the gap is widened by a hydraulic cylinder 14, and the grooved drum 7 is rotated in a reverse
Take out 6.

If the spiral groove 12 is opened without compressing the grooved drum 7, the flat tube 15 can be easily dropped into the spiral groove 12. In this case, after dropping, the grooved drum 7 is compressed to form the flat tube 15 into a predetermined coil shape, and then the compression is released to take out the flat tube coil 16.

A fourth aspect of the present invention is a method of forming a circular tube into a flat tube coil using the grooved drum of the present invention. That is, as shown in FIG.
Of the circular tube 21 into the spiral groove 12 (FIG. 5A), and then compresses the grooved drum 7 to process the circular tube 21 into a flat tube 15 and simultaneously form it into a coil (FIG. 5B). The compression of the grooved drum 7 is released (FIG. 5C), and the flat tube coil 16 is removed from the grooved drum 7. Circular tube 21 is flat tube 1
When machining into No. 5, the straight section of the flat tube may be dented inward depending on the machining conditions, so the machining conditions must be set with care.

The spring material constituting the grooved drum of the present invention may be any material having spring properties, for example, carbon steel, Si
-Mn steel, Cr-Mo steel, phosphor bronze and the like can be used.
In the grooved drum of the present invention, as shown in FIG. 3, even if the major axis direction of the flat tube matches the radial direction of the flat tube coil, the minor axis direction of the flat tube matches the radial direction of the flat tube coil. Similarly, good coil forming is performed. The direction of the major axis or minor axis of the flat tube relative to the coil radial direction is appropriately selected according to the use of the flat tube coil.

The apparatus of the present invention can be applied to the production of a double-winding heat exchange coil for hot water supply using the flat tube 12 shown in FIG. 6 as a heat transfer tube, and a bent tube for floor heating shown in FIG. 7, and is particularly useful. It is. The flat tube coil for floor heating having the shape shown in FIG.
After the flat tube coil is formed by the apparatus of the present invention, the coil is formed into a shape shown in FIG.

[0016]

As described above, the continuous pipe forming apparatus of the present invention is a continuous pipe forming apparatus provided with a drawing equipment having a die and a floating plug and a pipe bending equipment having a mandrel. In addition, since the floating plug and the mandrel are integrated, a long tube can be coil-formed, and the productivity is excellent. Further, in the grooved drum of the present invention, a spiral groove for compressing a coil spring formed by winding a spring material in a longitudinal direction and dropping a tube into a coil shape on the outer periphery of the compressed body is adjacent. Since it is provided straddling the two spring material layers, after forming the tube coil in a state where the grooved drum is compressed, when the compression is released, the groove width is widened and the drum diameter at the groove bottom is reduced so that the tube diameter is reduced. The coil can be easily taken out. Also, a circular tube can be formed into a flat tube coil. Therefore, an industrially remarkable effect is achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a tube forming apparatus according to the first aspect of the present invention.

FIGS. 2A to 2C are explanatory views of a grooved drum according to the second aspect of the present invention.

FIGS. 3A and 3B are explanatory views of a method of using the grooved drum according to the second aspect of the present invention.

FIGS. 4A and 4B are FIGS. 3A and 3B, respectively.
It is an enlarged explanatory view of the spiral groove part of (b).

FIG. 5 is an explanatory diagram of a method of forming a circular tube into a flat tube coil using the grooved drum of the present invention.

FIG. 6 is an explanatory perspective view of a double-winding heat exchange coil for hot water supply.

FIG. 7 is an explanatory plan view of a bent pipe for floor heating.

FIG. 8 is an explanatory view of a conventional pipe forming apparatus.

[Explanation of symbols]

 Reference Signs List 1 die 2 floating plug 3 drawing equipment 4 pipe 5 mandrel 6 pipe bending processing equipment 7 grooved drum 8 raw pipe 9 spring material 10 coil spring 11 compression body of coil spring 12 spiral groove 13 spring material layer of coil spring 14 hydraulic cylinder DESCRIPTION OF SYMBOLS 15 Flat tube 16 Flat tube coil 17 Drum clamp 18 Drum shaft 19 Flange 20 Drive gear 21 Circular tube 22 Conventional grooved drum 23 Conventional grooved drum spiral groove 24 Core metal

Claims (4)

[Claims] 1. A continuous pipe forming apparatus comprising a drawing apparatus having a die and a floating plug and a pipe bending apparatus having a mandrel, wherein the floating plug and the mandrel are integrated. And continuous forming equipment for pipes. 2. A method of continuously drawing a raw tube by a drawing facility having a die and a floating plug, and continuously bending the drawn tube by disposing a mandrel integrated with the floating plug therein. Characteristic continuous forming method of pipe. 3. A helical groove for winding a spring material into a coil shape and compressing it in the longitudinal direction, and forming a spiral groove for dropping a tube into a coil shape on the outer periphery of the compressed body, the two adjacent spring material layers. A grooved drum for forming a tube coil, which is provided so as to straddle. 4. A circular tube is wound around the spiral groove of the tube coil forming grooved drum after the compression is released, and then the grooved drum is compressed in the longitudinal direction to form the circular tube into a flat shape. Then, the compression of the grooved drum is released, and the flat shaped tube is taken out from the grooved drum.