JP3277769B2 - Thin tube winding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-walled tube winding device for winding a thin-walled tube used for an air conditioner or piping of various facilities.

[0002]

2. Description of the Related Art FIG. 3 is a front view showing a schematic structure of a conventional thin tube winding device. A thin tube, for example, a copper tube 1 is a container 1
a is stored in a ragged state. A winding drum 2 is arranged at a predetermined position in order to wind the copper tube 1 in an aligned state, and a straightening roll 3 is arranged between the copper tube 1 and the winding drum 2. Further, a bending roll 4 is provided near the winding drum 2, and a support roll 5 is provided near the bending roll 4.

[0005] The copper tube 1 drawn from the container 1 a is passed through a straightening roll 3, passed through a supporting roll 5, and further wound under a bending roll 4 on a winding drum 2. The straightening roll 3 straightens the copper tube 1 by correcting the warp and twist of the copper tube 1. The straightening roll 3 is
A groove having a predetermined curvature may be formed on the roll surface in accordance with the diameter of the copper tube 1 to be wound. The bending roll 4 performs preliminary bending in the bending direction at the time of winding. The tip of the copper tube 1 is fixed to the winding drum 2, and by rotating the winding drum 2, tension is applied to the copper tube 1. Winding is performed in the state where is given (however, the winding tension is
Since the support roll 5 is interposed and the direction of rotation of this roll is the direction in which the copper tube 1 is pulled from the straightening roll 3, the tension in the winding drum 2 is slightly reduced.

[0004]

However, in the above-described conventional configuration, the copper tube 1 is bent along the outer periphery of the winding drum 2 as the copper tube is wound on the winding drum 2. FIG. 4B shows the bending cross section (R _H > R _V ), and when the straightening roll 3 comes out, a cross section of a perfect circle (R _H = R _V ) as shown in FIG. The shape was flattened by being pressed by the bending roll 4 and the winding drum 2 ((a) of FIG. 4 is a cross-sectional shape of the copper tube 1 at the position aa in FIG. 3. Yes,
(B) is a cross-sectional shape of the copper tube 1 at the position bb in FIG. 3).

There is also a method in which the bending roll 4 can be moved up and down, and a bending similar to the winding diameter is given in accordance with the winding layer (the number of steps) of the winding drum 2 before winding. The cross section of the copper tube is flattened by the bending roll 4. As described above, the flatness of the copper tube deteriorates the roundness, and may exceed a preset allowable range (customer specification or the like). The amount of deformation due to flattening differs depending on the number of winding steps (winding radius), and is large in the inner layer and small in the outer layer. Therefore, there is a large difference in roundness between the beginning and end of winding of the copper tube. .

When winding a copper tube, the flattening rate of the copper tube increases as the winding radius decreases, and the flattening rate decreases as the winding radius increases. That is, the innermost layer is the largest, and the flattening rate decreases as the number of turns increases. When the roundness of the innermost layer and the outermost layer is compared, if this difference exceeds the required roundness tolerance, a product that meets the requirements will not be made no matter what adjustment is made. .

[0007] Further, since the diameter of the cross section of the copper tube in the drum width direction is not constant between the winding layers, there is a problem that the alignment winding cannot be performed with high accuracy. An object of the present invention is to provide a winding device for a thin-walled tube which can maintain the roundness even when the thin-walled tube is wound, and can further improve the winding shape and appearance.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a thin-walled tube winding device for winding a thin-walled tube around a winding drum while aligning the thin-walled tube. And a control means for controlling the predetermined forming amount in accordance with the winding curvature of the thin-walled tube in the winding drum. .

[0009] The control means can control the distance between the pair of rolls to cancel the shape distortion generated when the thin tube is wound. According to the above-described means, the stress (strain) applied in the vertical direction applied by the bending roll and in the height direction applied to the thin-walled tube by the winding drum restores the original stress to the bending direction by the forming roll. It is applied to a thin-walled tube before the roll. Thereby, the thin-walled tube is wound up in a perfect circle state. Then, a difference occurs in the amount of distortion between the forming roll and the winding drum depending on the winding state of the bending roll and the winding drum. Therefore, the setting of the roll width of the forming roll is changed according to the winding state of the bending roll and the winding drum. As a result, it is possible to accurately perform the alignment winding from the start end to the end end of the thin-walled tube, and to maintain the roundness of the thin-walled tube within an allowable range.

More specifically, a stress corresponding to the amount of distortion that offsets the amount of distortion applied to the thin-walled tube by the bending roll and the winding drum is flattened by the forming roll in the horizontal direction, that is, in the direction perpendicular to the winding drum. When stress is applied so that the modulus becomes zero, the thin-walled tube returns to its original cross-sectional shape, and becomes a perfect circle from the beginning to the end.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a schematic configuration of an embodiment of a winding device for a thin-walled tube according to the present invention. FIG. 2 is a plan view of the embodiment of FIG. The copper tube before winding is housed in the container 10 in a wrapped state. A winding drum 12 for winding the copper tube 11 from the container 10 in an aligned state is provided at a predetermined position. The winding drum 12 includes a cylindrical body 12a,
Disc-shaped flanges 12b provided on both end surfaces of the body 12a
It is composed of A straightening roll 13 is provided between the copper tube 11 and the winding drum 12. A bending roll 14 is provided near the winding drum 12, and a straightening roll 13 near the bending roll 4 is provided.
The support roll 15 (including the upper roll 15a and the lower roll 15b) is disposed in the direction of.

Further, between the straightening roll 13 and the support roll 15, a forming roll 16 is provided. As shown in FIG. 2, the forming rolls 16 hold the copper tube 11 from both sides so that the bending rolls 14 come in contact with the vertical direction, while the bending rolls 14 come in contact with the horizontal direction, which is a direction perpendicular to the bending direction. It is arranged in the form that it does. The shape of the forming surface of the rolls 16a and 16b can be a flat roll, an arc groove roll, a V groove roll, an elliptical groove roll, or the like. The rolls 16a and 16b are not provided with a driving force from the outside (however, they can be provided).
The copper tube 11 rotates due to friction caused by traveling. And
The forming roll 16 is provided with an adjustment handle 17 for adjusting the distance (that is, pressing force) between the rolls 16a and 16b.
It has. By rotating the adjustment handle 17, the rolls 16a and 16b approach or separate at the same rate according to the direction of rotation.

The winding drum 12 is provided with a winding number detector 18 for detecting the number of windings per layer. The winding number detector 18 includes a main body 18a, a rod-shaped actuator 18b reciprocally inserted into the main body 18a,
And the roller 1 mounted on the tip of the actuator 18b
8c. The roller 18c is the winding drum 1
The actuator 18b moves in the direction of the main body each time the number of stages increases, and an electric signal corresponding to the amount of movement is transmitted to the main body 18 by the drum 18 or the surface of the already wound copper tube.
a.

Further, a control device 19 using a microcomputer is connected to the winding number detector 18. Furthermore,
The control device 19 is connected to a control motor 20 to be controlled, and serves as a roll movement drive source for changing the gap between the rolls 16a and 16b of the forming roll 16. In the present embodiment, the diameter is 10.0 mmφ and the thickness is 1.0 mm.
mm copper tube is wound on the winding drum 12 in ten steps (layers). First, the copper tube 11 pulled out of the copper tube 11 is passed through the support roll 15 through the straightening roll 13, and further, the leading end is engaged with the winding drum 12 through the lower side of the bending roll 14. In the course of rotation of the winding drum 12, the straightening roll 13 corrects the copper tube 11 for warping, twisting, and the like to make the copper tube 11 a perfect circle. A groove having a radius of curvature may be formed on the roll surface in accordance with the diameter of the tube 11).

Further, a curvature is given to the copper tube 11 by the bending roll 14. At the time of winding by the winding drum 12, as shown in FIG. 2, it moves in the direction of arrow B while rotating (reciprocating movement is possible), thereby enabling the copper tube 11 to be aligned and tightly wound. For example, in the case of FIG. 2, winding is performed while moving the winding drum 12 in the upward direction in the figure, and when winding of one stage (for one layer) is completed, winding is performed while winding the second stage on the first stage. The take drum 12 is moved downward in the figure.

When the copper tube 11 having the above dimensions is wound, the rolls 16a and 16b of the forming roll 16 have R = 10 mm.
Use the one provided with the arc groove of the specification. To suppress the deformation of the cross section of the copper tube 11 within a certain range, the forming roll 1
6, it is necessary to give a deformation reverse to the deformation caused by winding. Therefore, at the start of the winding of the forming roll 16, the roll width A is set to 9.0 mm. In this case, if a 550 mmφ drum (body portion 12 a) is used as the winding drum 12, the winding radius increases by about 10 mm each time one stage is wound.

When the first stage is wound on the winding drum 12, a detection signal is issued from the winding number detector 18, and based on this signal, the control device 19 starts the motor 20, and the roll width of the rolls 16a and 16b. A is expanded by 0.05 mm. This kind of control is performed up to the third winding,
In the 4th to 6th stages, the roll width A is increased by 0.10 mm, and in the 7th to 9th stages, the roll width A is increased by 0.15 mm each time one stage of winding is completed, so that the 10th stage roll width A becomes 9.95 mm. To control.

As described above, the roll width A of the forming roll 16
Is not linearly controlled in accordance with the number of windings because the amount of distortion applied to the copper tube 11 and the amount of molding due to the distortion do not change proportionally. When the amount of distortion to be applied is small, the amount of molding hardly changes due to the influence of springback, but the amount of molding becomes proportional to the amount of distortion to be applied.
The method for adjusting the roll width A varies depending on the outer diameter, wall thickness, hardness, winding drum diameter, and the like of the copper tube 11.

The copper tube 11 wound by the above-described control is deformed by the forming roll 16 to extend in the vertical direction (vertical direction), and is processed into an elliptical cross-section when it exits the forming roll 16. After this, the bending roll 14
During the bending process and the winding by the winding drum 12, the distortion (deformation) swells in the horizontal direction. The amount of pressing at this time is set in a direction perpendicular to the pressing roll 16.
Therefore, the copper tube 11 is returned to a perfect circle and wound. In this way, the copper tube 11 wound on the winding drum 12 maintains a constant shape from the front end to the end.

Although the winding number detector 18 is an example of a contact type structure, the distance from the measurement point to the copper tube surface is measured by a laser method, and the number of steps (coil diameter) is determined from the change in the distance. A calculation method, a method of calculating the winding length of the copper tube from the number of rotations of the winding drum 12, or the like can also be used. Further, in the above-described embodiment, the setting of the roll width A is changed in units of a plurality or one step.
A = 9.2 mm for layers, A = 9.4 mm for layers 5-7, 8-
Simplified control, such as setting 10 layers at A = 9.8 mm, is also possible. In this case, the change in the cross-sectional shape of the copper tube is larger than the control shown in the above embodiment,
It is possible to keep it within a certain range, and there is no practical problem.

Further, in the above embodiment, the interval between the rolls 16a and 16b is automatically set by the motor 20 based on the output of the control device 19, but may be set manually. Specifically, the control device 19 may display the roll width (roll-to-roll distance) on a display device (installed in the vicinity of the forming roll 16), and operate the adjustment handle 17 based on the displayed value. .

Further, in the above-described embodiment, a copper tube is described as an example of a thin-walled tube. However, the present invention is not limited to a copper tube, and is applicable to other metal tubes such as an aluminum tube. It is.

[0023]

As is apparent from the above description, according to the present invention, a forming roll provided with a pair of rolls which are installed in front of a bending roll and form a thin-walled tube from a horizontal direction, and a thin-walled tube in a winding drum are provided. Since the control means for changing the distance between the pair of rolls according to the degree of winding is provided, the precision of aligned winding can be increased from the beginning to the end of the thin-walled tube, and the roundness of the thin-walled tube can be set within an allowable range. Can be kept within.

[0024] The control by the control means includes controlling the distance between the pair of rolls so that a pressing force corresponding to the amount of distortion that cancels the amount of distortion applied to the thin tube by the bending roll and the winding drum is generated. Since it is set, a perfect circle can be formed over the entire length from the start end to the end.

[Brief description of the drawings]

FIG. 1 is a front view showing a schematic configuration of an embodiment of a winding device for a thin-walled tube according to the present invention.

FIG. 2 is a plan view of the embodiment of FIG.

FIG. 3 is a front view showing a schematic configuration of a conventional thin tube winding device.

4A and 4B show cross-sectional shapes before and after winding of a copper tube in the thin tube winding device of FIG. 3, wherein FIG. 4A shows a state before winding and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Copper tube 12 Winding drum 13 Straightening roll 14 Bending roll 15 Support roll 16 Forming roll 16a, 16b Roll 18 Number of turns detector 19 Control device 20 Motor

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-128024 (JP, A) JP-A-58-97425 (JP, A) JP-A-57-42458 (JP, A) JP-A-58-974 42561 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 54/02 B21C 47/02 B65H 54/28 B65H 55/04

Claims (2)

(57) [Claims] An apparatus for winding a thin-walled tube around a winding drum while aligning the thin-walled tube, comprising: a pair of rolls for holding the thin-walled tube in a horizontal direction and forming the same with a predetermined molding amount. And a control means for controlling the predetermined forming amount according to a winding curvature of the thin tube in the winding drum. 2. The winding of a thin-walled tube according to claim 1, wherein the control means controls a distance between the pair of rolls to cancel a shape distortion generated at the time of winding the thin-walled tube. apparatus.