JPH0518646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in rolling rolls, particularly in assembled rolls comprising a shaft and a sleeve integrally fitted onto the shaft.

(Prior art) Needless to exemplify, the type of rolling roll in which a sleeve for performing rolling work is fitted onto the outer peripheral surface of the shaft, which is the main body of the roll, is well known, and the material suitable for rolling can be freely selected. This has a great advantage in that the sleeve can be replaced. There are roughly two types of assembly rolls. That is, the shrink fit shown in FIG.
Or similar press-fitting, blind-fitting, etc.
There are two types: one type in which the inner circumferential surface of the sleeve contacts the outer circumferential surface of the shaft, and the other type in which the inner circumferential surface of the sleeve does not contact the outer circumferential surface of the shaft.In the shrink fit method shown in FIG. It is externally fixed to the surface by shrink fit, and the rolling torque is transmitted and the thrust force is maintained at the contact part of both 1 and 2, and a predetermined shrink fit allowance is ensured. Therefore, high processing accuracy is required for the shrink-fit portion of the sleeve 1 and shaft 2.

On the other hand, as a type in which the inner circumferential surface of the sleeve and the outer circumferential surface of the shaft are not in contact, for example,
There is a mechanical assembly structure disclosed in Japanese Patent No. 133065. The detailed structure is given in the publication, but the sleeve is tightened by pressing force in the longitudinal axis direction of the shaft via the tightening ring, and the joint surface of the sleeve and the tightening ring is opened inward or opened toward the shaft center. It has a tapered joint surface that opens outward, an annular gap exists between the inner circumferential surface of the sleeve and the outer circumferential surface of the shaft, and the sleeve material is made of cemented carbide.

(Problems to be Solved by the Invention) The shrink-fit type assembly roll shown in FIG. Although it is widely used, as mentioned earlier, not only high processing accuracy is required, but also the shrink fit generates tensile stress on the inner surface of the sleeve.
The sleeve may break during operation. Further, when removing the sleeve 1 from the shaft 2, cutting or cutting must be performed, and the removed sleeve 2 cannot be reused. The mechanical assembly and fixing method disclosed in Japanese Patent Application Laid-Open No. 52-133065 has the following problems. In other words, attached drawing No. 1 in the same publication,
In each of the embodiments shown in Figures 2 and 3 (hereinafter, reference numbers follow the notes attached to each figure), when the tapered joint surfaces of the sleeve 5 and the ring 17 are of the inward-opening type, compressive stress is generated on the outer and inner surfaces of the sleeve 5. However, it is inevitable that the ring 17 in contact with the sleeve 5 expands outward as a reaction to the pressing force, and the inner surface of the ring 17 and the outer surface of the shaft 1 come out of contact and are subjected to a large rolling load. It cannot be used for rolling shaped steel, etc., which limits the application.In addition, if the tapered joint surface shown in attached Fig. 4 is of the outward-opening type, the contact area between the sleeve 5 and the ring 17 When supporting the rolling load and rolling torque, tensile stress is generated on the inner surface of the sleeve 5 due to the tightening force on the ring 17 side, as in the case of shrink fitting, so there is a disadvantage that sleeve breakage occurs. .

(Means for Solving the Problems) In order to solve the problems in the prior art as described above, the present invention provides an assembled rolling roll consisting of such a sleeve and a shaft, so that the sleeve can be attached and detached, so that it can be mechanically removed. This assembly roll is made up of a shaft and a sleeve that is fitted onto the shaft, and the sleeve is fitted over the shaft. When fixed to the shaft with a bolt and a support ring, a double taper is formed on the axial side surface of the sleeve, which slopes upward and downward in opposite directions toward a plane perpendicular to the axial center line of the shaft. The double tapered surface supports the rolling stress, and the inner and outer fitting surfaces of the sleeve support ring and shaft are tapered surfaces, and the tapered surface is provided with a key. Further, the shaft and the sleeve support ring are provided with a female threaded portion for removing the sleeve, and a tightening bolt for torque transmission is provided on the side surface of the sleeve.

(Function) According to the technical means of the present invention, as shown in FIG. A tapered surface 4 is formed at the end, and a male threaded portion 9 continuing to the tapered surface 4 is formed in series, and the sleeve 1 is fitted from the male threaded portion 9 side onto the outer circumferential surface 2a via the tapered surface 4, and the shaft of the sleeve 1 is While joining one end of the direction to the ring-shaped wall 2b,
The other end in the axial direction is provided with a tapered surface 4 through the male threaded portion 9.
On top, the externally fitted support ring 3 is joined via the tapered surface 3c that matches the tapered surface 4, and the male threaded part 9
By screwing in a plurality of tightening bolts 5 evenly distributed in the circumferential direction of the tightening nut 8 screwed into the sleeve 1, the sleeve 1 is pressed and tightened in the axial direction through the support ring 3, and is integrated with the shaft 2. At the same time, tapered surfaces 6 are provided on the side surfaces of both axial ends of the sleeve 1, facing a plane A perpendicular to the axial center line of the shaft 2, and inclined in opposite directions, respectively.
A double tapered surface formed by a and 6b is formed as a joint surface, and in correspondence with this joint surface, each joint surface of the ring-shaped wall 2b and support ring 3 in the shaft 2 is also formed with matching tapered surfaces 2c and 2d and tapered surface 3.
a, 3b, and the ring-shaped wall 2
b and the support ring 3 are provided with a plurality of female threaded portions 7, 7 for removing the sleeve equally spaced in the circumferential direction, and a ring is provided on the double tapered surface facing the ring-shaped wall 2b of the sleeve 1. By tightening the tightening bolts 10 for torque transmission through the insertion holes 2e arranged equidistantly in the circumferential direction of the shaped wall 2b, the following effect is produced. That is, sleeve 1
1, loosen the tightening bolt 5, remove the tightening nut 8 from the male threaded part 9, and then screw the bolt into the female threaded part 7 of the support ring 3. Remove the ring 3 through the tapered surface 4 and the male threaded part 9, remove the tightening bolt 10 from the ring-shaped wall 2b side, and remove the ring 3 from the female threaded part 7 of the ring-shaped wall 2b.
Screw in the bolts and attach the sleeve 1 to the outer peripheral surface 2a.
It can be pushed out from above to the tapered surface 4 side, pulled out from the shaft 2, and removed very easily. Also, during assembly, it is easy to fit the sleeve 1, the support ring 3, and tighten the tightening nut 8. Installation can be easily performed by tightening the tightening bolt 10 to the sleeve 1 and screwing the tightening bolt 5 into the tightening nut 8. In particular, when removing the sleeve 1, there is no need to cut or fuse the sleeve 1. It can be easily and quickly processed without the need for special tools.

Further, in the conventional shrink fit method and the sleeve pressing method using a support ring as typified by JP-A-52-133065, tensile stress is generated on the inner surface of the sleeve, but the sleeve 1 of the present invention , two tapered surfaces 6a, 6 are provided at both ends in the axial direction, and are inclined in opposite directions upwardly and downwardly, respectively, on a plane A perpendicular to the axial center line of the shaft 2.
Since a double tapered surface is formed by b, the stress generated in the sleeve 1 due to the pressing force of the sleeve support ring 3 and the tightening bolt 5 is canceled out within the sleeve 1 by these opposing double tapered surfaces. In fact, the sleeve as a whole is
There is no stress caused by the assembly, and it provides an effect that cannot be obtained not only with the shrink fit method but also with the tightening ring method disclosed in Japanese Patent Application Laid-Open No. 52-133065 and others that use a support ring with a tapered surface in only one direction. ,
This prevents breakage of the sleeve. In addition, by arranging the tightening bolt 10 on the side surface of the sleeve 1 on the opposite side of the tightening bolt 5, the tightening force in the shaft axial direction is reinforced, and the rotation prevention effect in the circumferential direction of the sleeve 1 is strengthened. This results in more reliable torque transmission.

(Example) Each example of the assembled roll according to the present invention will be sequentially explained with reference to FIG. 1 and subsequent figures.

In the embodiment shown in FIG.
As for a and 6b, the upper tapered surface 6a is opened inward, and the lower tapered surface 6b is opened outward, and the inclination angles θ and θ' can be arbitrarily set. Further, the presence or absence of a gap between the outer circumferential surface 2a of the shaft 2 at the sleeve fitting position and the inner circumferential surface 1a of the sleeve 1 is optional. The inclination angle γ of the tapered surface 4 following the outer circumferential surface 2a can also be set arbitrarily, but the outer diameter of the tapered surface 4 and the male threaded portion 9 that follows it is made slightly larger than the standard outer diameter of the shaft 2. To facilitate fitting and removing the sleeve 1. A plurality of female screw threads 7 for sleeve removal in the ring-shaped wall 2b and the support ring 3 are provided equally spaced in the circumferential direction, and a plurality of tightening bolts 5, 10 are similarly provided in a plurality in a shape equally spaced in the circumferential direction. is placed.

In the embodiment shown in FIG. 2, the structure for fastening the sleeve 1 using the support ring 3 and the tightening bolt 5 is changed, and tapered surfaces 4 are provided on both longitudinal sides of the sleeve mounting outer circumferential surface 2a of the shaft 2. A sleeve 1 having a male screw portion 9 formed thereon and a double tapered surface formed by tapered surfaces 6a and 6b on both sides in the axial direction is fitted onto the outer peripheral surface 2a. , tapered surfaces 3a and 3b corresponding to tapered surfaces 6a and 6b, respectively.
The support rings 3, 3 each having a female threaded portion 7 for sleeve removal are fitted, and at this time, the tapered surface 3c corresponding to the tapered surface 4 of the support ring 3 is fitted into the tapered surface 4. One or more keys 11 are interposed in the circumferential direction on the mating surface, and when tightening the tightening bolt 5, from one support ring 3 to the other support ring 3 as shown in the figure. A tightening bolt 5 is inserted through the sleeve 1 parallel to the axis, and is fastened and fixed by a nut 12. In this case, a plurality of tightening bolts 5 are used at equal intervals in the circumferential direction, and tightening nuts 8, 8 are screwed into respective female threaded portions 7, 7 following the tapered surfaces 4, 4. That is, this type uses a support ring 3 instead of the ring-shaped wall 2b integrated with the shaft 2 in the embodiment shown in FIG. In the embodiment shown in FIG. 2, the upper inwardly opening tapered surface 6a of the double tapered surface
This shows the taper angles θ and θ' of the lower outwardly opening tapered surface 6b changed. The use of key 11 also enhances torque transmission.

The embodiment shown in FIG. 3 is an example for use when the sleeve 1 is thin (such as a table roller). 7 and the use of support rings 3, 3 and tightening nuts 8, 8 are similar to the embodiment of FIG.
A, 6b and corresponding tapered surfaces 3a, 3b are formed, and a step 13 is formed following the lower tapered surface 3b to support or face a part of the inner circumferential surface 1a of the sleeve 1, and a tightening bolt 5 is screwed into the corresponding double taper surface of the sleeve 1 from one support ring 3 side for fastening.
In other parts, the same reference numerals as in the embodiment of FIGS. 1 and 2 indicate the same members.

In the embodiment shown in FIG. 4, a tapered surface 4 and a male threaded portion 9 are formed on both sides of the outer circumferential surface 2a for attachment of the shaft 2, and the double tapered surface of the sleeve 1 fitted onto the outer circumferential surface 2a. In the tapered surfaces 6a and 6b that constitute the upper tapered surface 6
a is opened outward, and the lower tapered surface 6b is opened inward, which is opposite to the double tapered surface in each of the first, second and third figures, and each support ring 3 has a female threaded portion 7 for sleeve removal. The corresponding tapered surfaces 3a and 3b are similarly reversed, and the tapered surfaces 4, 3c, and keys 11 are used to fit and connect them externally.
It is tightened by the tightening bolts 5, 5 provided on the respective tightening nuts 8, 8 screwed into the female threaded portions 7, 7, and the sleeve is removed from the female threaded portion 7 of one of the support rings 3. A tightening bolt 10 for torque transmission is screwed into the sleeve 1 side for the purpose of this, and in this way, the tapered surfaces 6a and 6b of the double taper surface on the side surface of the sleeve 1
is a convex shape that extends outward from the side surface of the sleeve 1,
Alternatively, the sleeve 1 may have a concave shape extending into the side surface of the sleeve 1, or one side surface may be convex and the other side surface may be concave.

The embodiment shown in FIG. 5 is an example in which two sleeves 1, 1 are arranged side by side on the outer circumferential surface 2a for attachment of the shaft 2, and the sleeves 1, 1 are arranged at the center position in the longitudinal direction of the outer circumferential surface 2a for attachment. , a ring-shaped wall 2b corresponding to the support ring 3 is integrally protruded, the tapered surface 4 is omitted on both sides of the outer circumferential surface 2a, and only male threaded parts 9, 9 are formed, and tapers are formed on both sides in the axial direction. Two sleeves 1 provided with double tapered surfaces 6a and 6b,
1 on both sides of the ring-shaped wall 2b, on the outer peripheral surface 2a,
Fit over 2a. Tapered surfaces 2c and 2d corresponding to the tapered surfaces 6a and 6b are formed on both side surfaces of this ring-shaped wall 2b. Next, support rings 3, 3, whose inner surfaces have female threads that are screwed into the male threads 9 and have tapered surfaces 3a, 3b corresponding to the tapered surfaces 6a, 6b, are screwed onto the outside of each sleeve 1, 1. Then each support ring 3,
3, the tightening nuts 8, 8 screwed into the male threaded portions 9, 9 are screwed and crimped. According to this, the tightening bolts 5, 10 can be omitted. The embodiment shown in FIG. 6 is an example in which two sleeves 1, 1 are also used, but in this case, the two sleeves 1, 1 are assembled in a direct connection, and the sleeves 1, 1, a double tapered surface is formed by tapered surfaces 6a and 6b on the outer surface in each axial direction, and a double tapered surface is formed on the inner surface in the axial direction by tapered surfaces 6c and 6d that join to each other. One of the tapered surfaces is convex and the other is concave. A tapered surface 4 and a male threaded portion 9 are provided on both sides of the outer circumferential surface 2a for mounting of the shaft 2.
are respectively formed, and after fitting the two sleeves 1, 1 in a joined manner on the outer circumferential surface 2a, a support ring 3, which has a tapered surface 3c on each tapered surface 4, 4, is formed.
3 and taper surfaces 3 of each support ring 3, 3.
a, 3b are connected to the tapered surfaces 6a, 6b on the outer surfaces of the respective sleeves 1, 1, and are connected to the tightening nuts 8, 8 screwed into the respective male threaded portions 9, 9 on the outside of the support rings 3, 3. The support rings 3, 3 are tightened by threaded tightening bolts 5, 5, and the 5th and 6th rings are tightened depending on the purpose and content of the rolling process.
A plurality of sleeves 1 as shown can be used.

As seen in each of the above embodiments, in the present invention, tapered surfaces 6 on both axial side surfaces of the sleeve 1 are inclined in opposite directions.
A and 6b form a double tapered surface, which is pressed in the axial direction by the support ring 3 and the tightening bolt 5, and is removably mounted and integrated onto the outer mounting surface 2a of the shaft 2. The mounting structures shown in each embodiment may be freely combined or shared in part or in whole.

(Effects of the Invention) According to the present invention, an assembly roll using a conventional shrink fit method, or an assembly roll where a sleeve having tapered surfaces formed on both axial sides is integrated by axial pressing through a support ring. In contrast, this method has a great effect in reducing the assembly stress generated on the sleeve during assembly and preventing sleeve breakage accidents.Experimental results show that the conventional shrink fit method and tapered tightening surface In the case of the sleeve type, an assembly stress of approximately 10 Kg/cm ² is generated on the inner surface of the sleeve, whereas in the case of the present invention, it has been confirmed that the assembly stress is limited to 0 to 5 Kg/cm ² . This makes it possible to effectively prevent sleeve breakage accidents. Moreover, according to the present invention, because of the removable assembly method, unlike the conventional shrink fit method, the sleeve cannot be removed without destroying it, so normally the sleeve and shaft are kept as a pair in the same number Compared to the sleeve type, the sleeve can be easily removed and assembled, so the number of shafts can be significantly reduced. The sleeve also has an excellent feature in that it eliminates the restriction that it cannot be used for rolling shaped steel, which requires a large size, and can be used for a wide range of rolling processing applications, including rolling shaped steel.

[Brief explanation of the drawing]

Fig. 1 is a half longitudinal sectional front view showing a basic embodiment of the assembly roll of the present invention, Figs. 2 to 4 are half longitudinal sectional front views showing modified embodiments, and Figs. 5 and 6 are both half longitudinal sectional front views. FIG. 7 is a half-part longitudinal sectional front view showing an embodiment of the two-sleeve type, and FIG. 7 is a half-part longitudinal sectional front view of an example of an assembled roll using the shrink fitting method. DESCRIPTION OF SYMBOLS 1... Sleeve, 2... Shaft, 3... Support ring, 4... Tapered surface, 5, 10... Tightening bolt, 6a, 6b... Taper surface, 7... Female threaded part,
8...Tightening nut, 9...Male thread part, 11...Key.

Claims (1)

[Scope of Claims] 1. An assembly roll consisting of a shaft and a sleeve fitted onto the shaft, in which when the sleeve is fixed to the shaft with a bolt and a support ring, an axial side surface of the sleeve is provided. ,
It is characterized by providing double tapered surfaces that are inclined in upper and lower directions opposite to each other toward a surface perpendicular to the axial center line of the shaft, and supporting rolling stress by the double tapered surfaces. Assembly roll for rolling. 2. The assembled roll for rolling according to claim 1, wherein the inner and outer fitting surfaces of the sleeve support ring and the shaft are tapered surfaces. 3. The assembly roll for rolling according to claim 1, wherein the inner and outer fitting surfaces of the sleeve support ring and the shaft are tapered surfaces, and a key is provided on the tapered surfaces. 4. The assembly roll for rolling according to claim 1, wherein the shaft and the sleeve support ring are provided with a female screw portion for removing the sleeve. 5. The assembled roll for rolling according to claim 1, characterized in that a tightening bolt for torque transmission is provided on the side surface of the sleeve.