JP2002248509A - Knot working roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a most suitable knot working roll in the case where a concave groove provided with a knot working groove is made to use the knot working roll formed on the outer peripheral face in manufacturing a deformed bar steel for attaching a tunnel reinforcing material. SOLUTION: This knot working roll comprises what a concave groove 3 extending in the circumferential direction on the outer peripheral face of a pair of rolls made to rotate around a parallel axis line with each other is formed, and also a plurality of the knot working grooves 5-7 crossing by pointing the concave groove 3 toward the axial direction in the bottom face of the concave groove 3 are formed to align in a place spaced in the circumferential direction, and the knot working grooves 5-7 is formed to make a helical configuration by pointing them toward the circumferential direction, and also a helix angle α of the knot working groove 5 of a part of them is made a different angle from the helix angles β, γ of the other knot working grooves 6, 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knitting roll for producing a deformed steel bar for mounting a tunnel reinforcement.

[0002]

2. Description of the Related Art In recent years, in order to attach a reinforcing material to the inner wall surface of a tunnel, a spiral screw is formed on the outer periphery of a shaft at one end of the steel bar, and the above-mentioned screw is formed on the outer periphery of the shaft at the other end. A deformed steel bar having a helical ridge which is twisted more slowly than the portion is used. In such a deformed steel bar for mounting a tunnel reinforcing material, the other end side shaft portion on which the ridge portion is formed is embedded in concrete on the inner wall of the tunnel, so that the one end side shaft portion on which the screw portion is formed. It is supported in a state protruding from the inner wall of the tunnel, and after inserting a mounting hole for the tunnel reinforcing material into the protruding one end side shaft portion, and tightening a bolt into the screw portion, the tunnel reinforcing material is tunneled. To be fixed to the inner wall. Conventionally, when manufacturing such a deformed steel bar for mounting a tunnel reinforcing material, the screw portion and the ridge portion are formed on a steel bar having a predetermined length one by one using a lathe.

[0003]

However, in such a manufacturing method in which a thread portion and a ridge portion are formed one by one with a lathe on each steel bar, the manufacturing efficiency is extremely low first, and a predetermined number of bars are formed. In addition to the problem that it takes a lot of time and effort to manufacture the deformed steel bar for mounting the tunnel reinforcing material, the portion between the screw portion and the ridge on the outer periphery of the steel bar is scraped off and discarded as chips. Therefore, there was a problem from the viewpoint of effective use of resources. Further, since the torsion angles of the threaded portion on one end side and the ridge portion on the other end side of the deformed steel bar to be manufactured are different as described above, even when these are formed by a lathe, the feeding and the bar There is also a problem that the ratio with the rotation must be changed, and the production efficiency is unavoidably further reduced.

The present invention has been made under such a background, and when manufacturing the above-described deformed steel bar for mounting a tunnel reinforcing member, a joint having a joint groove formed on an outer peripheral surface thereof is provided. An object of the present invention is to use a processing roll, and to provide a knotting roll suitable in that case.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve such an object, the present invention is directed to a pair of rolls which are rotated about axes parallel to each other and extend circumferentially on the outer peripheral surfaces of a pair of rolls. A knitting roll having a groove formed therein, and a plurality of knotting grooves crossing the groove in the axial direction formed on the bottom surface of the groove so as to be arranged at intervals in a circumferential direction. Wherein the knotted grooves are formed so as to form a spiral toward the circumferential direction, and the torsion angles of some of the knotted grooves are different from those of the other knotted grooves. And Therefore, a pair of rolls having a concave groove provided with such a joint processing groove are arranged such that the positions of the mutual grooves correspond to the axial direction, and the positions of the joint processing grooves also correspond to the circumferential direction. Then, while rotating in mutually opposite directions so that the peripheral speeds become equal, by continuously inserting a long steel bar into the gap formed between the concave grooves, the above-mentioned part of the twist angle is different. A long deformed steel bar in which threaded portions and ridges having different torsion angles are alternately formed by the knotted grooves and other knotted grooves is formed. By cutting so that the ridges are located, the deformed steel bar for mounting the tunnel reinforcing material described above can be obtained.

Here, if the above-mentioned part of the knotted grooves is formed with a gentler torsion angle than the other knotted grooves and is further constituted by a plurality of kinds of knotted grooves having different helix angles,
The above-mentioned ridges buried in the tunnel inner wall of the manufactured deformed steel bar for mounting the tunnel reinforcing material can also be constituted by a plurality of types of ridges having different twist angles, thereby improving the burial strength on the tunnel inner wall. Can be. Furthermore, in this case, if the plurality of types of joint processing grooves have different depths, the embedding strength can be further improved.

[0007]

FIG. 1 to FIG. 7 show an embodiment of the present invention. In these figures, reference numerals 1,
Reference numeral 2 denotes a pair of rolls formed of a hard material such as a cemented carbide and having the same shape and size as each other,
These rolls 1 and 2 are formed in a multi-stage cylindrical shape centered on an axis O having a large diameter at the center and small diameters at both ends, and make the axes O and O parallel to each other. Both ends are supported in a state where the outer peripheral surfaces of the central portion are opposed to each other with a very small interval therebetween, and are rotated in the opposite rotational directions A and B at the same rotational speed around the axes O and O by driving means (not shown). It can be rotated toward. And
On the outer peripheral surfaces of the central portions of the rolls 1 and 2, the same number of concave grooves (caliburs) 3, 4, which circulate in an annular shape around the axis O, are provided on the rolls 1, 2.
Are formed so as to be arranged at equal intervals in the directions of the axes O, O and at the same position in the direction of the axis O between the rolls 1 and 2. .., 8..., 10... Crossing the concave grooves 3, 4 in the direction of the axis O, and are arranged at intervals in the circumferential direction of the rolls 1, 2. Is formed. However, in FIG.
, 8 ... to 10 ... are not shown.

Here, the concave grooves 3 and 4 are formed such that a cross section along a plane including the axis O is substantially semicircular, and as described above, In a state where the outer peripheral surfaces of the central portions are opposed to each other with a very small gap therebetween, the cross section of the bottom surfaces of the two concave grooves 3 and 4 at this opposed portion is spaced apart from one another by the above-mentioned interval as shown in FIG. It is arranged so as to be located above. In addition, both sides of the concave grooves 3 and 4 in the outer peripheral surface of the central portion of the rolls 1 and 2
2 and both sides of the concave grooves 3 and 4 are alternately formed to have substantially the same shape and the same size, and have a sloping surface having a concave and convex section, so that the outer peripheral surfaces of the central portions of the two rolls 1 and 2 face each other. The gap thus defined also has a polygonal line shape having a constant width that is inclined with respect to the direction of the axis O through the center of the circumference of the one circle as shown in FIG.

The joint processing grooves 5... 7 to 8 formed so as to cross the bottom surfaces of the concave grooves 3 and 4.
2 are inclined in the same direction so as to form a spiral toward the circumferential direction of the rolls 1 and 2 (vertical direction in FIGS. 2 and 3) as shown in FIGS. The torsional angles α, β, γ formed by the knotted grooves 5 to 7, 8 to 10 with respect to a plane P passing through the widthwise center of the concave grooves 3, 4 and orthogonal to the axis O are different from each other. ing. That is, first, the first knotted grooves (other knotted grooves in the present invention) 5 and 8 of the two rolls 1 and 2 have steep angles α equal to each other and larger than the other twist angles β and γ. And the torsional angles of the second knotted grooves of both rolls 1 and 2 (some knotted grooves in the present invention and one of a plurality of kinds of knotted grooves) 6,9 β are also equal to each other and are set to a gentle angle smaller than the twist angle α. Further, a third joint processing groove (some of the joint processing grooves in the present invention, One kind)
The torsion angles γ are also equal to each other, and the angles are gentler than the torsion angle β. However, the difference between the twist angle β and the twist angle γ is smaller than the difference between the twist angle α and the twist angle β.

In the first and second rolls 1 and 2, the same number of first joint processing grooves 5 (in this embodiment, 14) are formed on both rolls 1 and 2, respectively. By being arranged so as to be arranged at equal intervals in the circumferential direction, the first joint processing groove groups 11 and 12 are configured. As shown in FIGS. 2 and 3, assuming that the outer peripheral surfaces of the central portions of the rolls 1 and 2 have been developed into a planar shape as shown in FIGS.
2, the reference positions Q and R on the rotation directions A and B are matched, and the rotation directions A and B are oriented in the same direction.
As described above, when the gaps are opened so as to oppose each other so that the cross section of the bottom surface is located on the circumference of 1 as described above, the first joint processing grooves 5 of the first joint processing groove groups 11 and 12 are formed. , 8 ... are alternately and continuously formed to define one spiral groove which is twisted at the twist angle α.

On the other hand, similarly to the first joint processing grooves 5, 8, the third joint processing grooves 7, 10 have a plurality of third joint processing grooves 7, 10 on both rolls 1, 2. Are arranged so as to be arranged at equal intervals in the circumferential direction except for the portion where the first knot processing groove groups 11 and 12 are formed. When they are opposed to each other, the third joint processing grooves 7 of both rolls 1 and 2 are also used.
Are alternately and continuously formed to define one spiral groove. However, since the helix angle γ of the spiral groove thus defined is smaller than the helix angle α, the helix groove
The pitch which advances in the circumferential direction during the circumferential twisting is larger than the first joint processing grooves 5, 8... In the present embodiment, the spiral grooves formed by the third joint processing grooves 7, 10. The length of the spiral groove defined by the first knotted groove groups 11 and 12 in the circumferential direction (the first knotted grooves 5,..., 8)
(The length of the spiral groove formed during the 14 turns).

Further, the second knotted grooves 6, 9 are formed in the rolls 1, 2 every other one of the third knotted grooves 7,. Each section is also arranged so that a plurality of them are arranged at equal intervals,
The plurality of second joint processing grooves 6, 9.
Are formed. However, the second knot machining grooves 6 in each of the second knot machining groove groups 13 and 14 are provided.
, 9 are not all the same, and as shown in the center of FIG. 2, the first joint groove groups 11, 12 are located between the adjacent third joint groove grooves 7,. When the second joint processing groove groups 13 and 14 are provided, the first joint processing groove group 1
In order to avoid interference with the first and second grooves 12, 1
3 and 14, the second joint processing grooves 6... 9 are three. If the first joint processing groove groups 11 and 12 are not arranged in this section, the number is five more. Further, these second joint processing grooves 13, 14 are formed in every other section between the third joint processing grooves 7,..., 10 adjacent in the circumferential direction as described above. Each time one of the spiral grooves of the third joint processing grooves 7... 10 defined with the development planes facing each other is twisted by one turn, the second joint processing grooves 6.
Are formed alternately (portions where the second joint processing groove groups 11 and 12 are formed) and portions where these are not formed.

In this embodiment, the first and third joint processing grooves 5, 7, 8, and 10 are all formed in the same shape and the same size, and are orthogonal to the directions of the torsion angles α and γ. As shown in FIG. 5, the cross section has an isosceles trapezoidal shape in which the groove width gradually decreases toward the groove bottom side, and the included angle θ between the groove walls is 9
The portion connected to the bottom surface of each of the grooves 3 and 4 is chamfered in a convex arc shape in cross section. These first and third joint processing grooves 5, 7, 8, and 10 are
Are formed so as to be twisted about the center C of the circumference of the first circumference formed by the cross section of the bottom surfaces of the two concave grooves 3 and 4 at the opposed portions of the first and second grooves. 3
Roller 1, 2
It is formed so as to open on both sides of the concave grooves 3 and 4 on the outer peripheral surface of the central part. On the other hand, as shown in FIG. 6, the second joint processing grooves 6 and 9 have the center D disposed at a position slightly retreated from the center C to the bottom surface side of each of the concave grooves 3 and 4. And the groove depth is shallower than the first and third joint processing grooves 5, 7, 8, and 10, and both ends thereof are recessed in the outer peripheral surface of the central portion of the rolls 1 and 2. The grooves 3 and 4 do not reach both sides. The cross sections of the second joint processing grooves 6 and 9 are also similar to those of the first and second grooves as shown in FIG.
Included angle θ equal to the cross section of the third joint processing grooves 5, 7, 8, 10
And the bottoms of the grooves 3 and 4 are not chamfered, but remain at an obtuse angle without being chamfered.

The first to third joint processing grooves 5... 7 to 8,... 8 to 10. The reference position Q,
From the R toward the rear side in the rotation directions A and B, as described above, the first joint processing grooves 5, 8.
After the formation of 2), the second joint processing grooves 6..., 9.
, 14 ...) and third node processing grooves 7 ...,
Are formed to form one pattern having the same circumferential length between the rolls 1 and 2, and such a pattern is formed between the rolls 1 and 2 depending on the circumferential length of the rolls 1 and 2. And the same number of patterns are formed. Then, while the rolls 1 and 2 are rotated at the same speed in the rotation directions A and B from a state where the reference positions Q and R coincide with each other at the opposing portions, the opposing portions are defined by the grooves 3 and 4. The steel bars are continuously inserted into the circular holes as shown in FIG. 4 along the rotation directions A and B, so that the concave grooves 3 and 4 and the first to third joint processing grooves 5 are formed. , 8 ...- 10 are plastically deformed to form a plurality of ridges on the outer peripheral portion of the steel bar.

Thus, when the reference planes Q and R are made to coincide with each other and the development planes are opposed to each other, the first joint processing groove groups 11, 1
2 are formed as one helical groove continuous with the twist angle α as described above, so that the first knot is formed on the outer peripheral portion of the steel bar. Due to the machining grooves 5, 8, a single spiral first protrusion which is twisted at a twist angle α around the center line of the steel bar is formed continuously. After that, one third ridge that is twisted at a twist angle γ that is gentler than the twist angle α of the first ridge is continuously formed by the third joint processing grooves 7, 10. In addition, between the third ridges in the center line direction, each time the third ridge is twisted one turn, the second joint processing grooves 6.
9 (second knot machining groove groups 13, 14), a portion where a plurality of helical second ridges having a helix angle β are formed, and a portion where the second ridge is not formed alternately. Will be arranged. However, this second ridge has a second joint processing groove 6.
.., 9... Do not reach both sides of the concave grooves 3 and 4, and are circumferentially divided at a portion facing the roll 1 side and a portion facing the roll 2 side of the outer peripheral portion of the steel bar.

Thus, according to the above-mentioned knot processing roll,
By continuously inserting the bar into the circular hole, the deformed bar in which the first ridges and the second and third ridges are alternately formed is continuously formed. If this is cut at the reference positions Q and R, that is, at the distal end position of the first ridge, a helical screw portion twisted at a twist angle α by the first ridge on the outer periphery of the shaft portion on one end side. Is formed at the other end of the shaft portion, and a second or third ridge is formed with a helical ridge which is also twisted at a more moderate torsion angle β, γ than the screw portion. That is, a deformed steel bar for mounting the tunnel reinforcing material can be obtained.
Therefore, as in the conventional case where the outer periphery of a steel bar is turned one by one with a lathe to form a screw portion or a ridge portion, the feed between the thread portion and the ridge portion in which the twist angle changes is changed. Without the need for complicated operations such as changing the ratio with the rotation speed, it becomes possible to manufacture the deformed steel bar for mounting the tunnel reinforcing material in a much shorter time and with less labor than in such a case. As described above, since threads and ridges are formed on the outer periphery of the steel bar due to plastic deformation, there are very few parts that are discarded from the steel bar material, and these are used to efficiently manufacture deformed steel bars for mounting tunnel reinforcements. Can be.

Further, in the present embodiment, the second and third joint processing grooves which form the protrusions by being twisted more slowly than the first joint processing grooves 5 and 8 forming the screw portion. It is composed of a plurality of types of joint processing grooves 6, 7, 9, and 10, and their torsion angles are also different from each other. Therefore, the second and third joint processing grooves 6, 7,
Similarly, the ridges formed by the ridges 9 and 10 are constituted by a plurality of types of second and third ridges having different twist angles β and γ. Since the other end side shaft portion will be embedded in the concrete of the tunnel inner wall, for example, even if this deformed steel bar is twisted along the spiral formed by the third ridge of the ridge portion, it is attempted to pull out from the tunnel inner wall, This can be prevented by the second ridges having different twist angles. Therefore, according to this embodiment, when the deformed steel bar manufactured by the knotting roll is used for mounting a tunnel reinforcing material, it is possible to improve the burying strength of the tunnel inner wall,
This makes it possible to improve the mounting strength of the tunnel reinforcing member mounted using the deformed steel bar.

Moreover, in the present embodiment, the depth between the second joint processing grooves 6 and 9 and the third joint processing grooves 7 and 10 is also different from each other. The groove depths of the knotted grooves 6, 9 are shallower than the groove depths of the third knotted grooves 7, 10, so that the height of the third ridge is higher than that of the second ridge in the manufactured deformed steel bar. It will be formed high. For this reason, for example, even if it is attempted to pull out the deformed bar while twisting along the spiral formed by the second ridge of the ridge, the second ridge has a different twist angle and a higher height. This can be prevented by the three protrusions, so that the burial strength can be further improved and the mounting strength of the tunnel reinforcing material can be further improved. In addition, in the present embodiment, since the plurality of second joint processing grooves 6, 9,... Do not reach both sides of the concave grooves 3, 4, the second ridge is also divided in the circumferential direction of the deformed steel bar. And the second knotted groove groups 13 and 14 are not formed with the second knotted groove groups 13 and 14 every time the third knotted grooves 7 and 10 are twisted in the circumferential direction of the concave grooves 3 and 4. Since the second ridge is discontinuous also in the axial direction of the deformed steel bar due to the formation of the portions alternately, pulling out the deformed steel bar while twisting along the twist of the second ridge as described above. This itself becomes difficult, and the burial can be buried in the inner wall of the tunnel more firmly.

In the present embodiment, these second and third
Are formed so as to be twisted in the same direction, although their twist angles β and γ are different.
In addition to these, as shown by chain lines in FIGS. 2 and 3, a plurality of twisting directions are different from the second and third joint processing grooves 6, 7, 9, and 10, and desirably, a plurality of twist angles δ are also different. The fourth joint processing grooves 15 may be formed in, for example, a portion where the second joint processing grooves 6 and 9 between the adjacent third joint processing grooves 7 and 10 are not formed. However, in the deformed steel bar manufactured by such a knotting roll, the ridge of the other end side shaft buried in the inner wall of the tunnel has a different twist angle δ in a different direction from the second and third ridges. A plurality of twisted fourth ridges will be formed, so even if the deformed steel bar is twisted in any direction, rotation is prevented by either the second, third or fourth ridges. Can be buried more firmly.

[0020]

As described above, according to the present invention,
A deformed steel bar having a thread portion and a ridge portion having different torsion angles can be formed easily and continuously, and without wasting material, thereby efficiently mounting a tunnel reinforcement. It is possible to manufacture deformed steel bars.

[Brief description of the drawings]

FIG. 1 is a side view of rolls 1 and 2 showing an embodiment of the present invention.

FIG. 2 is a development view of a groove 3 formed in the roll 1 shown in FIG.

FIG. 3 is a development view of a groove 4 formed in the roll 2 shown in FIG.

FIG. 4 shows concave grooves 3 and 4 at opposing portions of rolls 1 and 2.
FIG.

FIG. 5 is a cross-sectional view of first and third joint processing grooves 5, 7, 8, and 10;

FIG. 6 is a sectional view of concave grooves 3 and 4 in second joint processing grooves 6 and 9;

FIG. 7 is a sectional view of second joint processing grooves 6 and 9;

[Explanation of symbols]

 1, 2 Roll 3, 4 Concave groove 5, 8 First joint groove (other joint groove) 6, 9 Second joint groove (partial joint groove) 7, 10 Third joint groove Grooves (partially knotted grooves) 11, 12 First knotted groove groups 13, 14 Second knotted groove groups 15 Fourth knotted groove O Rotation axis of rolls 1, 2 A, B Roll 1, 2 rotation directions Q, R Reference positions of rolls 1 and 2 α, β, γ Torsion angles of first to third joint processing grooves 5 to 10

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyotaka Yumoto 1528 Nakashinda, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture F-term in Ryotec Corporation Abrasive Tools Factory 4E016 AA04 BA04 CA10 DA06

Claims (3)

[Claims] 1. A groove extending in the circumferential direction is formed on the outer peripheral surface of a pair of rolls rotated about axes parallel to each other, and the groove is formed on the bottom surface of the groove in the axial direction. A plurality of node processing grooves that are formed so as to line up at intervals in the circumferential direction at a node processing roll, wherein the node processing grooves are formed so as to form a spiral in the circumferential direction, A knitting roll characterized in that the torsion angle of some of the knotting grooves is different from that of the other knotting grooves. 2. The method according to claim 1, wherein the some of the joint processing grooves have a gentler twist angle than the other joint processing grooves, and are formed of a plurality of types of joint processing grooves having different twist angles. The joint processing roll according to claim 1, wherein 3. The knitting roll according to claim 2, wherein the plurality of types of knotting grooves have different depths.