JPH10146622A - Device for forming flange at end of cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately form a flange without break of a weld line by abutting a columnar roller over the entire width on a place where the flange of a large diameter welded cylinder is formed and gradually forming the flange while rotating the columnar roller around its axis. SOLUTION: The comparatively thin wall cylinder 1 on which the flange is formed is fixed in the round shape with plural fixtures 2, 3. By driving the fixture 2 with a motor, the cylinder 1 is pressed and fixed through a bevel gear 4. The fixture 3 is vertically divided into two and the cylinder 1 is pressed and fixed with a press. A forming disk 6 is rotated at low rotation with the driving motor 11 and flange forming is controlled by controlling a motor 8 for moving in the outer peripheral direction and a motor 9 for moving in the longitudinal direction through a slip ring connector 10 with an outer control panel 12 so that the inclination of the forming roller 5 is pressed against the cylinder during this rotation. After completing the flange forming, the forming roller 5 is returned to its home position with the moving motors 8, 9, the fixtures 2, 3 are also returned to their home positions and the large diameter cylinder 1 on which the flange is formed is detached from the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange forming apparatus for a product which cannot be formed into a right-angled flange at its end unless the cylinder is fixed with a relatively thin-walled large-diameter cylinder.

[0002]

2. Description of the Related Art In general, a punching process or a press forming process is applied to a flange of a cylinder or a pipe.

FIGS. 3 and 4 are cross-sectional views showing an example of a means for forming a flange by a press machine. The upper end of the cylinder is protruded by a length to be flanged and fitted into a lower mold. Lower it.

On the lower surface of the ram 100, a frusto-conical expansion guide 101 is protruded. When the ram 100 is lowered, the tapered surface of the expansion guide 101 comes into contact with the inner surface of the upper end of the cylinder 102. And then this part is
Pressed on the flat lower surface of 3 to form the flange.

In another flange forming operation, as shown in FIG. 5, the forming roller 106 is moved from the inner side to the outer side of the cylindrical plate 107 while being pressed against the outer side, thereby forming the flange. Buckles or undulates the flange forming surface. This deformation of the flange surface
In some cases, the gap between the cover and the cover cannot be prevented even with packing.

[0006]

When a press as shown in FIGS. 3 and 4 is used, the lower mold 103 and the upper mold 100 are used.
It is necessary to prepare and replace one that conforms to the dimensions of the large cylinder to be molded for each different cylinder dimension.

[0007] Therefore, flange forming by a press machine is advantageous for factory production of a large number of cylinders with a certain standard, but if it is applied to many types of cylinders with different standards, the cost of the mold is high and replacement work is required. Also takes time, which is disadvantageous.

Further, the thin large-diameter cylinder is manufactured by welding a plate material in terms of manufacturing and cost. For this reason, in the flange forming by the press machine, a load is applied instantaneously, so that a crack often occurs in the weld line portion. As a result, the roll-formed product is discarded as a defective product.

An object of the present invention is to provide an apparatus for forming a flange perpendicular to a cylinder, which can be applied to various kinds of welding cylinders having different diameters.

[0010] In addition, by applying the forming roller to the entire length of the flange forming surface in the radial direction, stepwise plastic deformation during forming is made uniform over the entire forming surface, thereby enabling flange forming with high dimensional accuracy. .

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a supporting means for projecting and fixing and supporting a large-diameter cylinder having an elliptical diameter only in a flange forming dimension, and also serving as a female mold. A male roller that rotates in a cylindrical shape longer than the flange width, and presses against the motor force via the gear box while revolving the flange diameter width to secure the molding force.

[0012] A cylindrical roller is placed at the place where the flange of the large-diameter welding cylinder is to be formed in contact with the entire width in the radial direction, and the cylindrical roller is formed by the revolution of the forming disk, and the cylindrical roller is formed while rotating by itself. . Further, a forming disk on which rollers are assembled to form a right-angled flange moves forward and backward while revolving.

The forming reaction force of the cylindrical roller receives a forming disk via an air cylinder.

[0014]

FIG. 1 is a side view showing an embodiment of the present invention.

A relatively thin cylinder 1 for forming a flange.
Is fixed in a perfect circular shape by a plurality of fixing tools 2 and 3 (only two are shown). The fixture 2 presses and fixes the cylinder 1 via the bevel gear 4 by driving a motor. The fixture 3 is divided into upper and lower parts, and the cylinder 1 is pressed and fixed by a press machine.

A plurality of (only one is shown) forming rollers 5 are assembled to a forming disk 6 via a moving unit of a bevel gear 7 so as to always contact the entire longitudinal surface of a flange portion to be formed. I have. Electrical control of the motor 8 for determining the position of the moving unit and the motor 9 for determining the position of the forming roller 5 is externally performed via a slip ring connector 10. The forming disk 6 also has a motor 11 for controlling the rotation at 10 to 50 rpm.

In the large-diameter thin-walled cylinder 1 fixed by the fixtures 2 and 3, the contact roller 5 is installed on the flange bending root of the inner diameter portion.

Next, the forming disk 6 is rotated by the drive motor 11 at a low rotation speed of 10 to 50 rpm. During this rotation, the outer peripheral direction motor 8 and the longitudinal direction motor 9 are subjected to flange forming control by the external operation panel 12 through the slip ring connector 10 so that the forming roller 5 can be inclined and pressed.

After the flange forming is completed, the forming roller 5 is returned to the original position by the moving motors 8 and 9, and the fixing tools 2 and
The flanged large-diameter cylinder 1 is also removed from the apparatus by returning 3 to its original position.

The above description has been made on the basic operation procedure for forming a flange on the end of a large-diameter cylinder. However, the present invention is not limited to this, and various application examples are possible. .

For example, if the shape of the forming roller 5 is provided with a knife edge portion as shown in FIG. 2, the flange outer diameter formed at a right angle can be cut to a specified dimension.

[0022]

【The invention's effect】

(a) A flange perpendicular to (or perpendicular to) the axis can be accurately formed at the end of the large-diameter thin-walled cylinder without breaking the welding line.

(B) With respect to various types of large-diameter cylinders having different diameters and wall thicknesses, a flange can be formed without requiring special adjustment, and has extremely high versatility.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a shape of a forming roller as an application example of the present invention.

FIG. 3 is an explanatory view showing conventional means using a press machine.

FIG. 4 is a sectional view of a state where a flange is formed by the press machine of FIG. 3;

FIG. 5 is a diagram illustrating a conventional flange forming method.

FIG. 6 is a diagram illustrating a conventional flange forming method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Large-diameter thin cylinder, 2 ... Fixing tool on the inner diameter side, 3 ... Fixing tool on the outer peripheral side, 4 ... Pressing mechanism for fixing tool, 5 ... Forming roller for flange forming, 6 ... Shaping disk, 7: bevel gear mechanism for moving the forming roller in the longitudinal direction, 8, 9: motor.

Claims (1)

[Claims] 1. A fixing means for fixing a thin, large-diameter cylindrical material deformed in an elliptical shape to a perfect circle so as to be able to form a flange, and said cylindrical plurality of forming rollers are provided at an end of the large-diameter cylindrical material. By taking a position in contact with the entire molding length from the inner diameter side to the outer diameter direction, it is possible to rotate around the central axis and control the roller pressing force constant until the cylindrical material bends 90 ° toward the outer diameter side, so that all sheet thicknesses Characterized in that the cylindrical member can be formed into a flange with high precision without buckling the root of the flange.