JPH0444241Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention relates to an assembly type roll.
In particular, the present invention relates to an assembly type roll that can securely tighten sleeves that are easily broken, such as sleeves made of various types of high-speed steel or cemented carbide, and fix them to the roll shaft.

[Conventional technology]

Sleeves made of cemented carbide and various high-speed steels are widely used for rolling wire rods, etc. because they are hard and have very good wear resistance. When holes, key grooves, pin holes, etc. are machined, they are very easy to break, and there are problems with fitting and tightening methods, and many proposals have been made to solve these problems.

In other words, since simple shrink-fitting or screw-fastening methods are prone to breakage, we recommend the screw-ring fastening method (Utility Model No. 55-4081) or the tightening method using the elastic force of a disc spring (Jikkosho Utility Model No. 55-4081).
58-14001), hydraulic tightening method (Jikkosho
55-32643), the sleeve is processed into a tapered shape,
Tightening method using this taper (Special Publication Act 52
-26227) have been proposed, but each has problems such as weak tightening force, the sleeve turning easily, and complicated structure.

For example, in the 1980s, the conventional sleeve was processed into a tapered shape and tightened using this taper.
In the method of No. 26227, all cross sections in the circumferential direction of the sleeve are the same, so depending on the tightening method, it is difficult to completely avoid free rotation of the sleeve and securely fix it.

In addition, a tightening method (Utility Model Publication No. 54-30355) has been proposed in which a part of the contact surface between the sleeve and the ring that tightens it is provided with inclined surfaces facing each other.
In this method, since the contact surface is equal in both semicircular portions bordering on the diameter of the sleeve, the contact area remains within a somewhat limited range, and may not be able to handle it depending on the torque state.

[Problems that the invention attempts to solve and the means to solve them]

The present invention provides a rolling roll which has a simple structure, an easy tightening method, and can provide strong and reliable tightening without allowing the fitted sleeve to freely rotate.

That is, the present invention provides an assembly type roll in which a sleeve is fitted to a roll shaft, and a conical surface having an apex at a position eccentric to the axis of the sleeve is provided on at least one side of the sleeve. The width of the sleeve was formed so that it became smaller in the outer circumferential direction, and a collar having a conical surface corresponding to and in contact with the conical surface was fitted and brought into contact with the sleeve, and was pressed and fixed with a fastener. The gist is assembly type rolls.

Next, as a preferred embodiment of the present invention, an example according to claim 2 of the utility model registration, that is, an example in which conical surfaces are formed on both side surfaces of the sleeve will be described with reference to the drawings.

Fig. 1 is a partially sectional front view illustrating one embodiment of the assembly type roll of the present invention, Fig. 2 is a perspective view of the sleeve used in Fig. 1, Fig. 3 is a plan view of the same, and Fig. 4 is the same. The front view and FIG. 5 are the same side views, showing an embodiment in which the cone angle is increased for ease of understanding. FIG. 6 is a schematic front view showing an example of a conical surface formed on the sleeve.

In the figure, 2 is a sleeve and on its side,
A conical surface 21 having an apex A at a position offset by a distance l with respect to the axis C of the sleeve is formed so as to have a small outer peripheral width.

Although Fig. 1 shows the case where the conical surfaces 21 are formed on both sides of the sleeve 2, the conical surfaces 21 may be formed only on one side of the sleeve 2, and the conical surface can be selected depending on the torque condition. be done.

FIG. 6 is a schematic front view illustrating this formation mode and corresponds to FIG. 4. In the same figure,
a indicates that the conical surface 21 is formed on one side of the sleeve 2, and b indicates that the conical surface 21 is formed on the boss portion 7 of one side.
1 is formed, and c shows the case where conical surfaces are formed on the boss portions 7 on both sides.

In the present invention, the eccentric distance l of the apex A of the conical surface formed on the side surface of the sleeve with respect to the axis C of the sleeve is preferably 0.5 mm or more.

Next, the conical angle θ formed by the conical surface intersecting with the side surface of the sleeve is suitably in the range of 3° to 20°.
Each of the above elements related to the conical surface, i.e., the formation location of the conical surface, the position of the apex of the conical surface (amount of eccentricity from the axis), and the conical angle are determined as appropriate depending on the size of the transmitted torque and the condition. Select and apply.

Next, each part of the drawing will be explained with reference to FIG. 1. 1 is an assembly type roll, 2 is a sleeve, 3, 3'
is a collar, 4 is a key, 5 is a roll shaft, and 6 is a screw ring (stop ring). A conical surface 31 corresponding to the conical surface 21 formed on the sleeve 2 is formed on the side surface of the collars 3, 3' in contact with the sleeve 2.

To assemble, assemble and fit the collar 3, sleeve 2, and collar 3' onto the roll shaft 5 in this order.
3' is fixed to the roll shaft 5 with a key 4, and is tightened in the axial direction with a screw ring 6. In addition, in FIG. 1, a mode in which a key is used as a method for fixing the collar and roll shaft is explained, but the method is not limited to this.
For example, a method of driving a pin may be used.

〔Example〕

A wire rod rolling roll with sleeve dimensions of 340φ x 220φi x 80mm was assembled and manufactured in the state shown in FIG. 1. The sleeve is made of HIP-treated high-speed steel equivalent to JIS.SKH57, and the collar and roll shaft are JIS.
A material equivalent to SCM440 was used.

Assembly was easy and the tightening and fixing was perfect.
As a result of continuous rolling of the wire rod using this roll, the sleeve could be used successfully for a long time without slipping or breaking.

[Action and effect]

In the roll assembled as described above, the sleeve 2 and the collars 3, 3' are in contact with each other at their respective eccentric conical surfaces 21, 31, and the two can rotate as a unit in an engaged state. It never happens. In this case, the contact area is much larger than that of the tightening method of Utility Model Publication No. 54-30355, so the compressive force acting on the tapered surface is equalized in the circumferential direction, and therefore, the compressive force applied to the collar taper part is not weakened. is less likely to occur. In addition, when torque is applied to the sleeve, the stress at the rising portion of the collar taper is mainly tensile stress in the present invention, whereas in the above-mentioned public notice method it is thought to be mainly shear stress. It is excellent.

Sleeve slipping is an important point that can lead to breakage and cause major accidents, so being able to prevent this is extremely significant in roll work.

The assembly type roll of the present invention has a simple structure, a small number of parts, and is an excellent roll that has the feature of being able to be securely and firmly tightened and fixed, although it is easy to assemble and manufacture.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view illustrating one embodiment of the assembly type roll of the present invention, FIG. 2 is a perspective view of a sleeve used in the embodiment of FIG. 1, and FIG. 3 is a plan view of the same. Figure 4 is a front view of the same, Figure 5 is
The same side view shows an embodiment in which the cone angle is increased. 6th
Figures a, b, and c are schematic front views showing examples of conical surfaces formed on the sleeve. In the figure, 1 is a roll, 2 is a sleeve, 21
is the conical surface, 3, 3' is the collar, 31 is the conical surface, 4 is the key, 5 is the roll axis, 6 is the retaining ring (screw ring), 7 is the boss of the sleeve, and C is the axis of the sleeve , A is the apex of the conical surface, l is the eccentric distance between the sleeve axis C and the apex A of the conical surface, and θ is the conical angle.

Claims (1)

[Claims for Utility Model Registration] (1) A prefabricated roll formed by fitting a sleeve onto a roll shaft, which has an apex on at least one side of the sleeve at a position eccentric to the axis of the sleeve. forming a conical surface such that the width of the sleeve decreases toward the outer circumferential direction, and fitting a collar having a conical surface corresponding to and in contact with the conical surface to abut against the sleeve; Assembly type roll that is pressed and fixed with fasteners. (2) A conical surface having an apex at a position eccentric to the axis of the sleeve on both sides of the sleeve,
The assembly type roll according to claim 1, wherein the sleeve is formed so that the width thereof decreases toward the outer circumference.