JPS5940097Y2 - Assembly roll of metal part - Google Patents

Description

[Detailed description of the invention] This invention aims to improve the wear resistance and surface roughness of roll metal parts that occur in rolling rolls, especially rolls with low hardness such as blooming rolls and rough rolls, which are subjected to a large rolling load. The present invention relates to a new roll whose properties are improved by an assembly structure.

As is well known, rolling rolls usually have a structure as shown in the first drawing.

Namely, the roll body 1 is in contact with the rolled material, the roll metal parts 2 are formed following both ends of the roll body 1 and support the rolling load and are used for rotation, and the roll metal parts 2 are formed subsequent to one of the roll metal parts 2 and are formed next to both ends of the roll body 1. It consists of a roll drive part 3 for transmitting rotation, and a roll free part 4 formed following the other of the roll metal parts 2 and necessary for handling, and of course the roll as a whole is an integral piece.

At this time, the roll body 1 is in direct contact with the rolled material and is used to produce a product, so it is strongly required to have wear resistance, roughness resistance, crack resistance, and toughness.

However, these properties are contradictory, and it is impossible to satisfy all of them 100%.

For this reason, the rolling load is relatively small and the thermal effect is small, and rolls for finishing stands that form shapes close to the final product are prepared with emphasis on wear resistance, but the rolling load is relatively large and the thermal effect is small. For large blooming rolls, coarse rolls, etc., toughness is the most important requirement.

Therefore, in the case of these blooming rolls and coarse rolls, the roll body 1 is made of a material with low hardness and excellent toughness, and the roll metal part that supports large loads is also an integral piece, so naturally they are the same. It is the material.

For this reason, the metal parts of these rolls in the blooming stand and composition stand support large loads and rotate.
Because it is made of a material that is strong but has low hardness, the roll metal part that is in contact with the bearing wears quickly and severely, and the roughness of the surface worsens, which adversely affects the bearing and shortens its service life. Problems arise, and countermeasures are desired, and it is known that countermeasures or improvement measures such as those illustrated in FIGS. 2 and 3 are currently being implemented.

In other words, the one shown in Figure 2 is based on surface overlay means.
A wear-resistant layer 5 is formed near the surface of the roll metal part 2, which is subject to wear, by thermal spraying or overlay welding using a wear-resistant metal material.

If thermal spraying is used, the strength of the welded part is low, and this will not be a problem for rolls for low-load stands, but for rolls that are subjected to heavy loads such as blooming rolls and rough rolls, the welded part will peel off and become unusable. It may happen.

In addition, when forming the wear-resistant layer 5 by overlaying a wear-resistant metal material on the roll metal part 2, problems such as peeling may occur because the roll material is cast steel and has good weldability. However, if the roll material is cast iron, the weldability is poor, making overlay welding difficult, and other issues arise, depending on the roll material.

Fig. 3 shows a sleeve shrink fitting method, in which a sleeve 6 made of a metal material with excellent wear resistance is separately manufactured on the surface of the roll metal part 2, and this sleeve 6 is integrated by shrink fitting. be.

This is not a problem if the structure allows shrink fitting, but if the roll drive part is fork-shaped as shown in Figure 5 and has a shape larger than the diameter of the roll metal part, the sleeve itself Charging is not possible and shrink fit means cannot be used.

The present invention was devised to solve the problems of the roll metal part in rolling rolls and other rolling rolls. The counter-driving part and the metal part following it are made of a material different from the material of the roll main body, and the metal part is formed as an integral part based on the shape of a sleeve, and the sleeve-shaped metal part is made of a material different from the material of the roll main body, and the sleeve-shaped metal part is made of a material different from the material of the roll main body. The point is that it is shrink-fitted to the metal part.

The present invention will be described in detail with reference to the illustrated embodiments below.
The figures all show embodiments of the present invention; the roll drive unit 3 in Figure 4 has a cross-shaped drive unit, and the roll drive unit 3 in Figure 5 has a fork shape. For example, when the roll is a rolling roll such as the above-mentioned blooming roll or coarse roll, the roll is made of a metal material with relatively low hardness and excellent toughness. A roll main body is formed from the body 1 and roll metal cores 2a, 2a that are integrally projected from both ends of the body 1, and the length and outer diameter of the roll metal cores 2a, 2a are set according to the desired roll. The dimensions shall be appropriately smaller than the dimensions of the metal part.

In the illustrated example, both the roll drive part 3 and the roll free part 4 are made of a different material from the roll main body, that is, a metal material with excellent wear resistance is used for the roll drive part 3 and the roll metal core part. An integrated body 7 consisting of a sleeve-shaped metal part 2b which is fitted onto the core part 2a, is shrink-fittable, has an outer diameter of a predetermined roll metal part size, and has an inner diameter to suitably fit into the core part 2a. Metal part 2 similar to part 4
b and separately adjust both of the integrated objects 7, and each integrated object 7
The sleeve portions 2b are shrink-fitted and fixed onto the respective rolled metal core portions 2a.

When the roll drive section 3 shown in FIG. 5 is a fork-shaped drive section, the shape of the roll drive section 3 in the integrated body 7 is fork-shaped, and the flange has a diameter larger than the outer diameter of the roll metal part. It differs from the one shown in FIG. 4 only in that it has a section, but is otherwise exactly the same.

At this time, the dimensions of the roll metal core 2a in the roll body may be determined by determining its outer diameter and length within the range of size required for strength, and depending on the thickness of the sleeve-shaped metal portion 2b. All you have to do is decide.

Also, the shrink fit allowance is determined by the transmission torque, shrink fit diameter, and shrink fit length, and the minimum thickness of the metal part 2b is the one that can withstand the shrink fit stress, and the thickness can be increased depending on the intended use. is free.

In carrying out the present invention, instead of using the integral part 7 as in the embodiment, on the non-drive side of the roll free part 4, if the shrink fit method shown in FIG. 3 is possible, a sleeve 6 is used. It is also possible to have a shrink fit structure.

According to the present invention, in rolling rolls and other rolls, the wear resistance and roughness resistance of the roll metal part 2 that supports large loads and is used for rotation via bearings can be improved independently of the roll body 1. It can be improved and improved as desired, and in this case, the roll drive part or/and roll free part (anti-roll drive part)
The sleeved metal part allows for extremely easy and reliable shrink-fit fixation, solving all the problems with conventional thermal spraying, overlay welding, and sleeve shrink-fit methods. Compared to the conventional sleeve shrink fit method, it is possible to shrink even when the drive part diameter is larger than the roll metal part, regardless of whether it is a fork-shaped drive part or a cross-shaped drive part, which has a larger diameter than the roll metal part. be able to fit,
It is also excellent in that it can simultaneously improve the abrasion resistance and roughness resistance of the roll drive part and roll free part, and according to the present invention, after the integral part 7 is disposed of, the roll main body can be reused, and the integral part 7 can be reused.
It is also economically advantageous because it can be used interchangeably.
It is excellent for improving the durability of the entire roll and the durability of the roll metal part, and even during shrink fitting.
The presence of the roll drive section 3 to the swing section 4 facilitates the operation.

[Brief explanation of the drawing]

Figure 1 is an overall view of a rolling roll, Figures 2 and 3 are partial cutaway views showing an example of a conventional roll metal part improvement structure, and Figures 4 and 5 are
Each figure is a partially cutaway overall view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Roll body, 2...Roll metal part, 3...Roll drive part, 4...Roll free part, 5...・Abrasion resistant layer, 6...
・Sleeve, 7...Integrated item, 2a...
Roll metal core part, 2b... Sleeve metal part.

Claims (1)

[Scope of utility model registration request] The roll driving part and the metal part following it and/or the roll anti-driving part and the metal part following it are made of a material different from the material of the roll main body, and the metal part is formed as an integral body in the shape of a sleeve, An assembly roll of a metal part, characterized in that the sleeve-shaped metal part is shrink-fitted to a roll metal part following the roll main body trunk.