JPS59163029A - Flange forming head of thin walled metallic cylinder - Google Patents

Abstract

PURPOSE:To eliminate sliding between the inside surface of a thin walled metallic cylinder and plural hourglass rolls having the same shape in a flange forming head for expanding forcibly the end part of said cylinder toward the outside by installing pivotally said rolls in the specific direction with respect to the center of a main revolving shaft. CONSTITUTION:A main revolving shaft 11 is of a T shape and its head part is so constituted as to guide an hourglass roll groups 14 by expanding the head part and forcing the same into the end part of a metallic cylinder 15. The seat 12 of each roll 14 is tray-shaped and is securely fitted via a sleeve onto the shaft 11 in the direction where the roll recesses toward the head part of the shaft 11. The bearing 13 of the roll 14 is a spherical bearing and the axial center 13' converges in a bevel shape into one point on the axial center 11'. The roll 14 is pivotally fitted on the bearing 13 along the center 13' between the head part of the shaft 11 and the annular build-up of the seat 12. Such head is advanced into the end part of the cylinder 15 while the head is rotated around the shaft 11 to expand forcibly the end part of the cylinder, thereby forming a flange 16. The inside surface of the cylinder 15 is kept free from rubbing and consequent flawing by the surface of the rolls 14 and the wear of surfaces of the rolls is lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing head that spirally expands the end of a thin metal cylinder to form a flange.

Conventionally, this type of flange formation method involves press forming using a die 8 whose shape matches the desired seven-flange shape, as shown in the longitudinal cross-sectional view in Fig. 1. The flange shape, outer diameter of the flange, and finished length of the metal cylinder are all constant, and the manufacturing process is simple and highly efficient. However, since the end material of a metal cylinder deforms rapidly, if a hard metal material is used for the cylinder, it may not be able to follow the deformation and cracks may occur, or it may not be able to withstand the pressing force and the metal material may be cut off before the flange is formed. There is a problem with buckling in the middle of the cylinder, and this method can only be applied to metal cylinders with relatively thick walls and soft materials.

For this reason, in the case of Japanese and Japanese shapes, those in which an umbrella-shaped roll is incorporated into the forming head are mainly used. As shown in FIG. 1aI is a vertical cross-sectional view, and as shown in BL is a plan view of FIG. A seven-flange 6-forming head 7 of a thin metal cylinder 5 in which umbrella-shaped rolls 4 of the same shape are each pivoted on a plurality of bearings 3 having an axis 3 parallel to the axis 1 is used.

In this case, the forming head 7 enters the end of the metal cylinder 5 while rotating around the main rotating shaft 10, and a plurality of rolls 4 of the same shape contact the inner surface of the end of the metal cylinder 5 in a helical manner and are successively pressed. Since expansion molding is performed, the 7 flange 6 at the end of the cylinder is formed by repeated slight deformation, so there is an advantage that no cracks will occur even if the material of the metal cylinder 5 is quite hard.

However, in this case, near the tip of the 7-lunge 6, both the inner surface of the 7-lunge 6 and the outer surface of the umbrella roll 4 are connected to the main rotating shaft 1.
Since the umbrella roll 4 forms a surface perpendicular to or close to the axis of the roller, the umbrella roll 4 can effectively press and expand the seven lunges 6. There is a defect in that the robot moves and does not perform any 7-lunge forming work, or only performs a small amount of work. Moreover, this part is an enlarged part of the 7-lunge 6 and is the part that requires the most amount of processing.

Figure 3 shows a longitudinal cross-sectional view of the 7-lunge forming portion of the umbrella-shaped roll and the metal cylinder, and the position where the inner surface of the metal cylinder and the outer surface of the umbrella-shaped roll begin to contact is A, the point where the tip of the 7-lunge contacts the outer surface of the umbrella-shaped roll. The inner diameter of the metal cylinder in part A is D1, which is the outer diameter of the umbrella-shaped roll, dl+, and the diameter of the flange in part B is D2. The diameter of the umbrella-shaped roll is Y dl.The width of the 1 flange is W.

dl, -d, -=D2- DI= 2 W The ratio of d2/dl and Dt/D+ (f, not equal) The umbrella-shaped roll rolls in contact with the inner periphery of the metal cylinder passing through A. In this case, the umbrella-shaped roll in contact with the inner periphery passing through the tip B of the 7-lunge portion will slide in the circumferential direction.

That is, the paint film on the inner surface of the metal cylinder may be rubbed and scratched by the surface of the umbrella-shaped roll, and the surface of the umbrella-shaped roll may also be abraded.

The present invention solves this problem.

The present invention is a processing head that expands the end of a thin metal cylinder outward to form a flange.
This head is a thin metal cylindrical seven-flange head characterized by having circular drum-shaped rolls pivoted on a plurality of carefully arranged bearings that intersect in an umbrella-like manner at points.

The present invention will be further explained based on examples.

Figure 4 shows an example of the implementation of the present invention, where ta+ is a longitudinal sectional view and figure 1- is a plan view of the same figure 1al viewed from the left.

In this example, the main rotating shaft 11 is T-shaped, and its head is enlarged to penetrate into the end of the metal cylinder 15 to guide the forming roll group 14.

The seat 12 of the drum-shaped roll 14 is dish-shaped, and the main rotating shaft 110
It is firmly fitted to the main rotating shaft 1 through a sleeve in a direction concave toward the head.

The bearing 13 of the drum-shaped roll 14 is a ball bearing, and the shaft center 13
' are gathered at one point on the axis 11' of the main rotating shaft 11 in an umbrella shape.

The drum-shaped roll 14 has a single-shaped head of the main rotating shaft 11 and a dish-shaped seat 1.
Between the annular ridge of 2 and the axis 13'l/(along the ball bearing
It is centered on.

Since the drum-shaped flange forming head of this example is constructed as described above, it has the following advantages over the conventional processing head shown in 172''.

■The drum-shaped roll 14'' of this example is the axis 11 of the main rotating shaft 1.
Since it is pivoted on the ball bearing 3 along the axis 13' that gathers in an umbrella shape at one point on the metal cylinder 15, when forming the drum-shaped flange 16 at the open end of the metal cylinder 15, mold roll 14
The roll surface has the effect of being able to carry out the expansion forming operation while directly abutting against the drum-shaped surface of the drum-shaped 7 flange 16 and rotating spirally.

(2) The ball bearing 13 of this example is installed on a seat 12 that expands outward along an axis 13' that gathers in an umbrella shape at one point of the axis of the main rotating shaft 1. Therefore, compared to the known example shown in Figure 2, there are significantly more (6 in this example, 4 in Figure 1).
A drum-shaped roll 14 can be installed with ball bearings 13
The number of metal cylinders 15 increases significantly (6 in this example, 4 in Figure 1), and this has the effect of smoothly expanding the end of the metal cylinder 15 outward.

(2) Since the ball bearing 13 can be installed outside the diameter of the metal cylinder, the installation work of the drum-shaped roll 1-4 is easy; (1) The inclination of the bearing axis 13' with respect to the main shaft axis 11'; Inclination angle of drum-shaped flange 16 of metal cylinder 15, drum-shaped roll 1
By selecting and setting the diameter of No. 4, the surface of the drum-shaped roll 14 and the tip, center, and root portions of the flange 16 of the metal cylinder 15 will match the circumferential speed in the rotational direction, and the roll surface and the inner surface of the 7-shinge will match. The sliding movement in the circumferential direction of the roll can be substantially less than that of the conventional roll shown in FIG.

(2) By applying a load in the radial direction to the ball bearing 13 and substantially reducing the load in the thrust direction, the ball bearing 13
The lifespan of can be extended.

(2) The installation location of the ball bearing 13 is large (it can be removed, so the size of the bearing can be increased).

(2) By increasing the number of drum-shaped rolls 14, processing time can be shortened and speed increased.

(2) It is possible to follow changes in the inner diameter of the metal cylinder by moving each drum-shaped roll forward or backward by an equal amount along the axis 13'. (This is not possible in the case of the parallel axes shown in Fig. 2.) ■Different from the cases shown in Figs. 1 and 1-2, there is a margin near the main shaft axis 11' of the washer 12, and a T-shaped main shaft head is placed in the center of the metal cylinder. A guide pilot such as this can also be provided.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing a conventional press molding head, fang 2
The figure shows a flange forming head using a conventional umbrella-shaped roll. 11...Main rotation axis, 11'...Main rotation axis center, patent attorneys Masa Akizawa and Mitsugai (2)

Claims (1)

[Claims] (1) A processing head that expands the end of a thin metal cylinder to form a flange, and is a processing head that is used for bearings installed at multiple axes that intersect the main rotation axis in an umbrella shape at one point. , a thin-walled metal cylindrical flange forming head characterized by having drum-shaped rolls of the same shape mounted together.