JPH11169992A - Manufacture of band plate screw by continuous screwing of steel plate stock, manufacturing device for its band plate screw and band plate screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a band plate screw whose outer periphery part becomes relatively thick in the plate thickness. SOLUTION: Axial directions of a pair of rolling rollers 22, 26 whose conical rolling parts 21, 25 are faced each other are set so that a gap between both conical rolling parts of the rolling rollers inclines at the angle θ2. The band plate screw 2 is rolled and formed by making a steel made plate stock 1 pass between both conical rolling parts 21, 25 and rolling it. A recessed difference 23 in level having a suitable depth which is omnipresent in a narrow side of the inclined gap is constituted in one conical rolling part 25 of a pair of conical rolling rollers 22, 26, and the band plate stock 1 is inserted and rolled. The reduction of the outer diameter side plate thickness of the band plate screw 2 to the plate thickness of the band plate stock 1 is lessened by forming a thick wall part 3 in the front surface or/and rear surface of the outer diameter side which is thin rolled to shape the outer peripheral part of the band plate screw 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing a strip screw by continuously bending a steel strip in the width direction by cold rolling, and manufacturing a strip screw by continuously spirally winding the strip. The present invention relates to a method and an apparatus for manufacturing a strip screw, and a strip screw.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a strip screw by continuously bending a steel strip material in the width direction cold.
The method of FIG. 6 is known. In other words, a pair of conical rolling rollers 51, 51 are axially provided, and the conical rolling rollers 5
The steel strip 50 having a constant thickness t1 is continuously fed from the material guide 53 so as to have an angle θ1 toward the symmetry line SL between the two opposing buses 52, 52. Things.

The conical rolling rollers 51, 5
The angle θ2 of the busbars 52, 52 opposed to each other across the one symmetric line SL is widened and arranged in the inner diameter direction of the roll-formed strip screw 54, and the strip screw 54 of the strip material 50 is positioned on the outer diameter side. The thickness t2 is smaller than the thickness t3 on the inner diameter side (t2 <t
3) The strip screw 5 is continuously rolled in the circumferential direction so that
4.

[0004]

For this reason, in the conventional product, the thickness t2 on the outer diameter side of the strip screw 54 is very much 35 to 50% of the thickness t1 of the strip material (material) 50. It has a problem that it becomes thin and its wear is short and its life is short depending on the application.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a strip screw having a relatively thick outer peripheral portion. The strip screw is manufactured by continuous rolling. At the time, to propose a method of manufacturing a strip screw by continuous screwing of a steel strip material in which the reduction in the thickness of the outer peripheral portion with respect to the thickness of the strip material as a material is reduced, and to provide a strip screw manufacturing apparatus. It is the purpose.

[0006]

SUMMARY OF THE INVENTION A method of manufacturing a strip screw by continuous screwing of a steel strip is performed so that a gap between a pair of conical rolling portions of a pair of rolling rollers opposed to a conical rolling portion is inclined. In the case of rolling the steel strip screw by rolling the steel strip between the two conical rolling sections,
Of the pair of conical rolling rollers, at least one of the conical rolling portions, the strip plate is inserted and rolled by forming a concave step having an appropriate depth unevenly distributed on the narrow side of the inclined gap, and thinly rolled. The gist of the present invention is to form a thick portion on the front or back surface on the outer diameter side or the front and back surfaces on which the outer peripheral portion of the strip screw is formed.

Further, in the apparatus for manufacturing a strip screw by continuous screwing of a steel strip, the gap between the two conical rolling sections of a pair of rolling rollers opposed to the conical rolling section is inclined and axially provided. In a device for feeding a steel strip material between the two conical rolling units and rolling a strip screw by rotating a rolling roller, at least one of a pair of conical rolling rollers for rolling the strip material. In the conical rolling portion, the gist is that a concave step of an appropriate depth is configured to be unevenly distributed on the narrow side of the inclined gap, and the outer diameter table or the thin rolled to form the outer peripheral portion of the strip screw or A thick portion is formed on the back surface or the front and back surfaces.

Further, the strip screw formed by continuous spiraling of the steel strip is formed by rolling a steel strip in such a manner that the strip is rolled so that the thickness thereof is thin and inclined in the outer diameter direction. The gist is that a thick portion is formed along the front or back surface on the outer diameter side of the plate screw, or along the front and back surfaces.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method for manufacturing a strip screw by continuous screwing of a steel strip according to the present invention, a strip screw manufacturing apparatus, and a strip screw according to the present invention will be described with reference to FIGS. explain. A steel strip material 1 as a material has a predetermined thickness t1 and a substantially strip width W of a strip screw 2 which is a roll-formed product, and a pair of rolling rollers described later by a material guide 10 of the strip screw manufacturing apparatus. Supplied in between.

One pair of rolling rollers of the strip screw manufacturing apparatus constitutes a regular conical rolling roller 22 having a regular conical rolling portion 21 formed of a linear bus bar 20, and the other forming a concave step 23. Conical rolling roller 26 having a stepped conical rolling portion 25 comprising a bus bar 24
And the rotation shafts 27 and 28 are provided, respectively.
It is rotated in the directions of arrows A and B by a rotation driving device (not shown).

The rotating shafts 27 and 28 of the regular conical rolling roller 22 and the deformed conical rolling roller 26 are angled so that the opposing buses 20 and 24 become narrower on the outer diameter rolling side of the strip screw 2. are arranged with an inclination of θ2 and have an angle θ toward the midline (symmetry line) SL of the angle θ2.
1 from the material guide 10 so as to hold the
Is continuously fed between the conical rolling rollers 22 and 26 (arrow C).

At this time, the deformed conical rolling roller 2
6, the concave step 23 of the bus bar 24 is configured on the large diameter portion side of the rolling roller so as to be unevenly distributed on the outer peripheral side of the formed band screw 2 with respect to the feeding position of the band material 1. I have. In the drawing, reference numeral 29 denotes both rolling rollers 22 and 2.
6 is a pitch tool which is disposed at the subsequent stage and is arranged so as to intersect with the formed strip screw 2. The pitch tool 29 is mounted so as to be position-adjustable in the direction of arrow D or E, and determines the pitch of the strip screw 2 by this adjustment.

Next, a method of manufacturing a strip screw by continuous rolling of a steel strip using the above-described strip screw manufacturing apparatus will be described. The strip 1 is continuously fed from the material guide 10 between the conical rolling rollers 22 and 26 (arrow C). At this time, the strip 1 is fed so as to maintain the angle of θ1 toward the middle line (symmetry line) SL of the opposing angle θ2 between the two generating lines 20 and 24 of the regular conical rolling roller 22 and the modified conical rolling roller 26. The two conical rolling rollers 22, which are fed and rotated (arrows A and B) by a rotary drive,
26 (arrow C).

The two conical rolling rollers 22, 26 are
Since the bus bars 20 and 24 are disposed opposite to each other with the angle θ2 interposed therebetween with respect to the symmetric line SL, the lengthwise extension of the side edge side of the rolled strip material 1 is increased, and the strip material is formed into a spiral shape by the difference in the extension. Is done.

At the time of this rolling step, since the stepped conical rolling section 25 composed of the bus bar 24 having the concave step 23 is formed on the deformed conical rolling roller 26, the strip 1 formed by rolling the strip 1 is formed. The screw portion 2 is inclined (inclination angle θ2) such that the virtual thickness t2 on the outer diameter side is smaller than the thickness t3 on the inner diameter side (t2 <t3) as a whole, and is unevenly distributed on the outer diameter side. The thick part 3 (thickness t4) of the shape rolling roller 26 due to the concave step 23 structure is formed.

That is, the thickness t4 of the outer peripheral portion formed by forming the thick portion 3 is larger than the virtual plate thickness t2 corresponding to the outer peripheral portion obtained by extending the inclined surface (t4> t2). Therefore, the thickness t4 of the outer peripheral portion of the strip screw 2 after forming with respect to the thickness t1 of the strip material 1 is 65 to 75%, and a sufficient thickness can be secured as compared with the conventional one. .

[0017]

FIG. 4 shows another embodiment of a strip screw manufacturing apparatus according to the present invention by continuous spiraling of a steel strip. In the present embodiment, both rolling rollers are
It is constituted by irregularly shaped conical rolling rollers 26, 26 having a stepped conical rolling portion 25 consisting of a bus bar 24 having three.

The above-mentioned biconical conical rolling rollers 26, 26
Are arranged with an inclination of an angle θ2 such that both busbars 24, 24 become narrower on the outer diameter rolling side of the strip screw 2, and the strip material 1 is positioned at the midline of the angle θ2 ( (Symmetry line) SL is guided by a material guide 10 (not shown) that holds the angle θ1 toward the SL.
Feed continuously between 26.

At this time, the two conical rolling rollers 26,
26, the concave step 23 of the bus bar 24 is unevenly distributed corresponding to the front and back sides of the formed strip screw 2 with respect to the feeding position of the strip material 1.
26 are arranged on each large diameter side.

The strip screw 2 using the strip screw manufacturing apparatus is roll-formed by continuously feeding the strip material 1 from the material guide 10 between the two conical rolling rollers 26, 26. The above both conical rolling rollers 26,
26 is an angle θ2 between the generating lines 24, 24 with respect to the symmetry axis SL.
Are provided and are opposed to each other, so that the narrower band material 1 expands on the side edge side, and is spirally formed by the difference in the expansion.

At the time of this rolling, the bus bars 2 each having a concave step 23 are provided on both the conical rolling rollers 26, 26.
Since the stepped conical rolling section 25 composed of 4 is configured,
A thick portion 3 (plate thickness t4) is formed on the front and back surfaces of the band plate material 1 on the outer diameter side of the formed band plate screw 2. Then, the strip screw 2 is inclined (inclination angle θ2) so that the outer diameter side virtual sheet thickness t2 is smaller than the inner diameter side sheet thickness t3 (t2 <t3).

Further, by forming the thick portion 3, the thickness t4 of the outer peripheral portion of the strip screw 2 can be formed to 65 to 75% of the thickness t1 of the strip material 1 in the same manner as in the above embodiment. Thus, a sufficient thickness can be ensured as compared with the conventional plate thickness.

[0023]

As described above, according to the method for manufacturing a strip screw by continuous screwing of a steel strip according to the present invention, the apparatus for manufacturing a strip screw, and the strip screw, the strip is supplied. In at least one of the conical rolling rollers of the pair of conical rolling rollers, the strip material was inclined-rolled, thinly rolled and unevenly distributed on the side where the outer peripheral portion of the strip screw was formed to form a concave step having an appropriate depth. As a result, a thick portion is formed on the front or back surface, or on the front and back surfaces, located on the outer diameter side of the strip screw.

Therefore, by forming the thick portion, the thickness of the outer peripheral portion of the strip screw can be formed to 65 to 75% of the thickness of the strip material as the material.
Since the thickness can be significantly improved as compared with the ratio of 50% to 50%, the life of the strip screw can be sufficiently provided against abrasion. The effect after implementing the present invention is extremely large.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a main part layout diagram showing a relationship between a strip screw manufacturing apparatus, a strip plate material, and a strip screw, illustrating a method of manufacturing a strip screw by continuous screwing of a steel strip sheet material according to the present invention.

FIGS. 2A and 2B are a front view (a) and a side view (b) of a main part showing a relationship between a rolling roller and a pitch tool in FIG.

FIG. 3 is an enlarged view of the strip rolling section.

FIG. 4 is a radial end view of the strip screw formed by rolling.

FIG. 5 is an enlarged view of a rolling section showing another embodiment.

FIG. 6 is a main part layout diagram showing a relationship between a strip screw manufacturing apparatus, a strip material, and a strip screw for explaining a conventional strip screw manufacturing method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 strip plate material 2 strip screw 3 thick part 10 material guide 20 bus bar 21 regular conical rolling section 22 regular conical rolling roller 23 concave step 24 bus bar 25 stepped conical rolling section 26 irregular conical rolling roller 27 rotating shaft 28 Rotating axis 29 Pitch tool

Claims (3)

[Claims] 1. A pair of rolling rollers having a pair of conical rolling sections opposed to each other, a shaft is provided so that a gap between the conical rolling sections is inclined, and a steel strip is passed and rolled between the conical rolling sections. In roll forming the strip screw, at least one of the pair of conical rolling rollers, at least one of the conical rolling sections, is unevenly distributed on the narrow side of the inclined gap to form a concave step having an appropriate depth. A strip formed by continuous spiraling of a steel strip, wherein a thick part is formed on an outer diameter side surface and / or a back surface on which an outer peripheral portion of a strip material is formed by inserting and rolling a sheet material and then rolling the strip material thinly. Screw manufacturing method. 2. A pair of rolling rollers having a pair of conical rolling sections opposed to each other, a gap between the conical rolling sections is inclined and axially provided, and a steel strip is fed between the conical rolling sections. In a device for rolling and forming a strip screw by rotating a rolling roller, among a pair of conical rolling rollers for rolling the strip material, at least one of the conical rolling portions is unevenly distributed on the narrow side of the inclined gap. And a concave step having an appropriate depth is formed, and a continuous strip of steel strip forming a thicker portion on the outer surface side and / or the rear face to form a peripheral portion of the strip screw by rolling thinly. Strip screw manufacturing equipment by screwing. 3. An outer peripheral portion of a strip screw formed by rolling a steel strip plate in such a manner that the thickness of the strip is thin and inclined in the outer diameter direction, on the outer surface side and / or the back surface of the strip screw. A strip screw formed by continuous screwing of a steel strip sheet material, wherein a thick portion is formed along the strip screw.