JPS6410294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for smoothly and high-quality winding a member having an irregular cross-sectional shape into a cylindrical shape.

[Prior Art] Generally, when winding a member having a cross section of an irregular shape other than a rectangle, when the material is bitten into the roll, the tip of the material is not bitten into the roll over the entire end surface at the same time. There was a problem in that partial slippage occurred between the material and the roll, causing scratches on the surface of the material and deformation of the cross section of the material.

Particularly when winding irregular cross-sections, it is best to wind the product parallel to the main axis of the cross-sectional shape, but for some rolled products, it is necessary to wind the product with an axis that is inclined to the main axis. . In this case, there were particular problems such as twisting, deformation of the cross section, large distortion accompanied by spot pitting, and sometimes cracking. If deformation occurs, a step or misalignment will occur at the butt weld between the beginning and end of the roll after winding, making it impossible to obtain a perfectly round product. In addition, if a spot buckle occurs, there will be a bend at the waist, and a near-straight part will occur at the beginning and end of the roll due to rebound, and when it is rolled into a cylindrical shape and joined, it will bend in a straight line at the joint. There was also the problem that the roundness of the product was damaged due to the formation of parts.

[Problems to be Solved by the Invention] An object of the present invention is to provide a cylindrical winding method that solves many of these problems by simply machining the cut shape of the end of the material.

[Means for Solving the Problems] According to the present invention, the above problems are achieved by the following cylindrical winding method.

When winding the material into a cylindrical shape by passing the material for cylindrical winding having an irregular cross-sectional shape between a main roll and a plurality of small rolls arranged around the main roll, the ends of the material in the winding direction are The cut shape is such that when the material is inserted between the main roll and the first small roll so that it is in contact with both rolls, the leading edge of the material contacts the next small roll at the same time on all end surfaces, that is, the front end of the material is in contact with the next small roll. The shape of the edge of the material that contacts the next small roll through the center of the next roll is A, and the front end of the material contacts the next small roll with all end faces at the farthest position from the center of the next small roll. The shape of the end of the material is B, and the material is the material when the line connecting the point D corresponding to the next small roll and the center of the next small roll passes through the center of the next small roll. If the angle is γ, and the distance between shapes A and B in the material winding direction is H, then there is a distance from shape A to shape B in the material winding direction by h={γ/(π/2)}×H. A cylindrical winding method characterized by winding the material into an end shape C determined from a trajectory connecting the points.

[Function] Since the material with the end shape C above contacts the next small roll on its entire end, when it is further wound between the main roll and the next small roll, twisting and cross-sectional deformation are minimized. can be suppressed to

[Example] The example will be described below with reference to the drawings.

FIG. 1 shows an automobile wheel rim material 1 as an example of a material for cylindrical winding having an irregular cross section. The material 1 has a flange portion f on one side and a gutter portion g on the other side in its cross section, and has a left-right asymmetrical shape. This winding process is performed by passing the material between a main roll 2 and small rolls 3, 4, and 5 disposed around the main roll 2, as shown in FIGS. 2 and 3.

The shape of the cuts 6, 6' at both ends in the direction in which the material 1 is wound between the rolls (direction P in FIG. 4, which is usually the longitudinal direction of the material 1) is formed into a special shape as shown in FIG. There is. Cut 6 at the front end in the winding direction
The shape of is such that when the material 1 is inserted between the rolls so as to be in contact with both the main roll 2 and the first small roll 3, and the front end of the material 1 comes into contact with the following small roll 4, the front end of the material 1 is shaped so that its entire front end surface contacts the small roll 4 at the same time (described later). In addition, the shape of the cut 6' at the rear end in the winding direction is such that when the material 1 is rolled into a cylindrical shape, it butts against the cut 6 at the front end without a gap, in other words, it depends on the shape of the cut 6 and the relationship between male and female. It has a certain shape.

The shape of the front end cut 6 is roughly determined as follows. First, the uneven shape of the outer surface of the rolls 2, 3, 4, and 5 is as shown in FIG.
The shape essentially follows the irregular cross-sectional shape of. When the material 1 is inserted so as to pass through the center O of the small roll 4, that is, when it is in the state A in FIG. The outer circumferential shape of the small roll 4 must be almost the same. That is, material 1
has a planar shape corresponding to line A in FIG. Also, when the material 1 is inserted parallel to the line passing through the center O of the small roll 4 and in contact with the small roll 4 at the farthest position from the center O of the small roll 4, that is, in the state shown in B in FIG. In some cases, in order for the cut 6 at the front end of the material 1 to fully contact the small roll 4,
Its planar cut shape is a straight line, that is, line B in Fig. 6.
It has a shape corresponding to . When the material 1 contacts the small roll 4 at an arbitrary angle, it is in a state intermediate between the above line A and line B, so the contact angle (the contact point D and the center O of the small roll 4) The connecting line and
If the angle formed with line A is γ, the planar cut shape C in this case is a locus with a height h that is γ/(π/2) times the height H of line B from line A in Fig. 6. It becomes a line that connects . In other words, the cross-sectional shape of the material is fixed, and the material 1 is transferred to the first small roll 3 and the main roll 2.
The shape of the cut end 6 of the material can be determined depending on the insertion angle γ at which the material 1 contacts the next small roll 4 when the material 1 is inserted so as to be in contact with the next small roll 4 .

When the material 1 having the above-mentioned cuts 6, 6' is bitten by the small roll 3 and the main roll 2, the front end of the material 1 first comes into contact with the next small roll 4. This contact is
Since all end faces are brought into contact at the same time, the cut ends 6 are bitten into the small roll 4 at the same time, and are smoothly drawn in as the small roll 4 rotates. In Fig. 2, the material 1 contacts the first small roll 3 at a contact point E, the main roll 2 at a contact point F (the main roll 2 and the small roll 4 are engaged and bent), and the last small roll 5. It is bent while receiving a load from the contact point G, and is wound into a cylindrical shape. When the winding is finished, the front and rear ends of the material 1 are abutted against each other and welded together to complete a cylindrical rim.

When simultaneous biting is performed at the small roll 4 as described above, biting starts on all end faces of the rim material 1 at the same time and bending force is applied, resulting in local deformation of the cross section. There is no slippage, and slippage is less likely to occur. Therefore, there are fewer scratches on the surface due to slippage. Furthermore, since there is little cross-sectional deformation, there is no difference in level or misalignment of the butt portions during butt welding after winding, so a perfectly round rim cylinder can be obtained. In addition, when all the end faces contact the small rolls 4 at the same time, the front end of the material 1 is forcibly supported by the rolls 4 during biting, which may cause spot digging and the resulting buckling. This also suppresses the occurrence of cracks due to large deformations, the occurrence of straight portions at the ends due to spot digging, and the prevention of perfect circular shapes.

[Effects of the Invention] As described above, when using the winding method of the present invention, by simply changing the planar cut shape at both ends of the irregular cross-section material, biting during winding with a conventional bender or coiler roll can be avoided. This has the effect of improving the roundness of the end portion, and preventing the occurrence of multifaceted deformation, scratches, and cracks.

In the above explanation, the winding of automobile rim material was used as an example, but the winding method of the present invention is not only applicable to the winding of automobile rim material, but also applies to general irregular cross-section winding. It can be widely applied to the winding of materials with

[Brief explanation of drawings]

Fig. 1 is a perspective view of an automobile rim material as an example of a material for winding, Fig. 2 is a side view of a winding device showing a state in the middle of winding, and Fig. 3 is a partial front view of Fig. 2. Fig. 4 is a plan view of the material shown in Fig. 1, Fig. 5 is a side view showing the contact angle of the material to the roll, and Fig. 6 is the front end of the material corresponding to the contact angle shown in Fig. 5. FIG. 3 is a plan view showing the cut shape of. 1...Material, 2...Main roll, 3, 4, 5...Small roll, 6, 6'...Cut.

Claims (1)

[Claims] 1. When winding the material into a cylindrical shape by passing the material for cylindrical winding having an irregular cross-sectional shape between a main roll and a plurality of small rolls arranged around the main roll, the end portion of the material in the winding direction The cut shape of the material is such that when the material is inserted between the main roll and the first small roll, the leading edge of the material contacts the next small roll at the same time on all end surfaces, that is, the front end of the material is in contact with the next small roll at the same time. The shape of the end of the material that contacts the next small roll through the center of the next roll is A, and the front end of the material contacts the next small roll with the entire end surface at the farthest position from the center of the next small roll. The shape of the end of the material in contact is B, and the material contacts in such a way that the line connecting the point D where the material corresponds to the next small roll and the center of the next small roll passes through the center of the next small roll. If the angle formed is γ, and the distance between shapes A and B in the material winding direction is H, then h={γ/(π/2)}×H from shape A to shape B side in the material winding direction. A cylindrical winding method characterized by winding the material into an end shape C determined from a trajectory connecting distant points.