JPS6328682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to rolling rolls used in three-roll planetary mills.

(Prior art) Three rolling rolls having a substantially truncated conical shape that revolve and rotate on their own axis are used, and by positioning the center of the rolled material at the center of revolution of the rolling roll group and letting it pass, the material can be rolled with a circular or octagonal cross section. In a three-roll planetary mill that elongates a rolled material, the rolling rolls are conventionally cast as a single unit and are manufactured by performing necessary cutting processes, etc.,
Therefore, due to the manner in which the roll is used, it is difficult to create a structure that fully satisfies the performance requirements of each part of the roll.

That is, FIGS. 1 and 2 show a conventional example of a rolling roll used in a three-roll planetary mill and its structure. Although only one rolling roll 3 of the rolled material 2 is shown in the example, the pass line (center of the rolled material)
Three pieces are arranged at a 120° angle to each other with
A conical roll of a roll 3 that is supported by a revolution frame with a roll head of 4 or less and revolves around a rolled material 3, and that is formed into a truncated conical shape by supporting the rolling roll 3 itself so that it can freely rotate. Rolling is performed by plastically deforming the material 2 to be rolled by the surface,
At this time, the rolling roll axis is set at a required angle of inclination with respect to the pass line. As shown in detail in FIG. 2, the structure of the rolling roll 3 includes a rolling zone 5a and a smooth zone 5b each having a conical circumferential surface having a different slope, which rotates in direct contact with the circumferential surface of the material to be rolled 2. It is a single roll integrally formed with a rolling part 5 and a support part 6 having a shaft clamp part 6a and a face gear part 6b formed in a perforated shape located at the roll axis, and the shaft clamp part 6a
A rotating shaft 7 is connected to the face gear part 6b via a clamp part 7a, and a rotating shaft 8 having the rotating shaft 7 concentrically therein is connected to the face gear part 6b via a face gear part 8a that meshes with the face gear part 6b. The rotating shafts 7, 8 are supported and set on the side of the mill body frame, and the rotating shafts 7, 8 and the rolling roll 3 are rotated as one. At this time, the rolling part 5 is required to have wear resistance and heat cracking resistance, while the supporting part 6 is required to have toughness, so different properties are required for each part where it is used. It is difficult to satisfy both of these requirements at the same time with such a single roll structure.

In other words, the rolling parts that come into direct contact with the material to be rolled are required to have excellent wear resistance and heat crack resistance, while the rotating support parts that are connected to the mill body and transmit the rolling torque are required to be strong and strong. It is difficult to provide different characteristics to each part of a single roll as described above, so for this type of roll, materials with emphasis on toughness of the rotation support part are used. This naturally results in a short roll life. In addition, since a face gear or a shaft clamp structure is required for the rotational support portion, the manufacturing process becomes complicated.
The manufacturing cost is also high, and if the rolled part becomes difficult to use, there is waste such as having to discard the entire roll.

Therefore, in order to solve the above-mentioned problem, a roll is divided into two parts, a rolling part and a shaft support, in the upper and lower axial directions.
Disclosed in the issue.

This split-structure rolling roll has a rolling roll that is divided into two parts in the axial direction, upper and lower, into a head member (rolling part) and a base member (supporting part), both of which can be attached and detached using fastening bolts. It was hot.

(Problems to be Solved by the Invention) In the conventional roll roll having a split assembly structure, the upper end surface of the head member engages with the lower end surface of the base member to which power is transmitted and rotationally supported via the engaging portion. Since the base member and the head member were fitted together and fastened with bolts, it was difficult to center the base member and the head member during assembly.

Furthermore, there was a risk that the base member and the head member would be misaligned due to the shear force acting on the head member during rolling, and there was also a risk that a large shear force would be applied to the fastening bolt.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an assembled roll having a split assembly structure, which allows easy centering during assembly, prevents misalignment during rolling, and allows reliable torque transmission. do.

(Means for Solving the Problems) In order to solve the above problems, the present invention takes the following measures. That is, the feature of the present invention is that the rolling roll used in the three-roll planetary mill includes a rolling part having a substantially truncated conical shape that contacts the material to be rolled, and a supporting part connected to the rotating shaft. A shaft clamp portion for connecting the rotating shaft is provided at an axial center portion of the support portion, and a face gear portion is provided on an end surface of the support portion coaxially with the shaft clamp portion. , and a convex portion or a concave portion having a polygonal circumferential surface is provided on the end surface of the supporting portion opposite to the face gear portion, coaxially with the shaft clamp portion, and on the other hand, on the end surface of the large diameter portion of the rolling portion, A concave part or a convex part having a polygonal peripheral surface that fits into the convex part or the concave part is provided coaxially with the outer peripheral surface of the rolling part, and the supporting part and the rolling part are coupled via the concavo-convex part, and It is removably fixed via bolts.

(Function) According to the present invention, the convex portion or concave portion of the supporting portion and the concave portion or convex portion of the rolling portion are fitted, and the supporting portion and the rolling portion are fastened via bolts, so that the rolling roll is Assembled. Since the supporting part and the rolling part are connected through the concave and convex part of the coaxial core, centering with respect to the rotating shaft is easy. Also, no misalignment occurs due to shear force during rolling. Further, since the peripheral surface of the uneven portion is polygonal, strong torque can be transmitted from the support portion to the rolling portion.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. Note that the same parts as in FIGS. 1 and 2 will be explained using the same reference numerals.

As shown in each embodiment in FIGS. 3A and 3B, a rolling section 5 includes a rolling zone 5a and a smooth zone 5b, a supporting section 6 includes a shaft clamp section 6a and a face gear section 6b. The rolling part 5 and the supporting part 6, which have been separately manufactured, are assembled into a two-part structure and then assembled and fixed to form the rolling roll 3. At this time, when dividing the rolling part 5 and the supporting part 6 into two, the joining boundary between the upper surface of the rolling part 5 and the bottom surface of the supporting part 6 is exposed on the outer periphery of the rolling roll 3, as illustrated in FIG. 3A. The same effect can be applied to either a type in which the bonding boundary remains within the body of the rolling roll 3 and is exposed on the upper surface of the roll without being exposed on the outer periphery of the roll, as illustrated in FIG. 3B. In addition, when joining and integrating both parts 5 and 6, the rolling part 5 side as shown in FIG. 3A and FIG. A concave portion 9 is provided in the support portion 6 side, and a convex portion 10 is formed on the support portion 6 side so that both the concave and convex portions 9 and 10 fit together, and the sectional view taken along the line AA in FIG. 3A and FIG. 3B A of
- As illustrated in FIGS. 3C and 3D, which are cross-sectional views taken along line A, the uneven surface portions 9 and 10 are polygonal such as a quadrangle or an octagon, and the rolled portion 5
In integrating the support part 6, as illustrated in FIG.
This is done using the fastening bolts 13. Note that the uneven portions 9 and 10 have the same effect no matter which side they are formed on. In addition, when manufacturing the rolling part 5 and the supporting part 6 separately, the rotating shaft 7 receives a clamping load (arrow A in FIG. 2) in the direction of the roll axis, and a tensile force is generated in the protruding part of the shaft clamping part 6a. and face gear part 6
At b, the shaft clamp part 6a receives the same clamping load from the rotating shaft 8, and at the same time receives a rolling load (arrow B in FIG. 2) through the rolling part 5.
These dual loads generate interlocking surface pressure and shear stress, so these conditions are taken into consideration and each part is manufactured using a material that has the characteristics required. It goes without saying that the fastening bolts 13 of No. 5 and 6 are designed to have strength (strength) commensurate with the stress generated by the clamp load and the pressure load.

(Effects of the Invention) According to the rolling roll 3 of the present invention, both the rolling section 5 having the rolling zone 5a and the smooth zone 5b that serve as rolling surfaces and the supporting section 6 to which the rotating shafts 7 and 8 are connected Since the roll can be divided into two parts and made of different materials, for example, the rolling part 5 is made of a material with excellent wear resistance and heat crack resistance, and the support part 6 is made of a material that is resistant to stress caused by clamping load and rolling load. It is extremely easy to manufacture the rolling part 5 using a material that is durable and strong, and therefore it is easy to select the material for the rolling part 5 that determines the roll life without being affected by the stress generated in the support part 6. This will further improve the lifespan. In addition, in this type of rolling roll 3, processing costs such as cutting work account for a high proportion of the manufacturing cost, and processing of the shaft clamp part 6a and face gear part 6b in the support part 6 is particularly complicated and difficult. If the support part 6 is made into a divided body as shown in FIG.
Even if the roll is discarded due to wear and tear, only the support part 6 can be reused.Furthermore, it is possible to reprocess only the support part 6 and obtain it, rather than the conventional single roll scrapped product. This opens the door to the use of rolling rolls used in three-roll planetary mills.
It is excellent in that it can effectively reduce initial and running costs due to increased roll life and the possibility of partially reusing the roll.

Moreover, in contrast to the conventional one shown in the above-mentioned West German Patent Application Publication No. 3043937, in the present invention,
To connect the two, a polygonal joint surface for transmitting pressure torque that surrounds the shaft clamp part and fits in both is coaxially formed, and both joint surfaces are fitted and assembled. Since they are removably fixed with multiple bolts, the two assembly parts are tightly integrated by their polygonal peripheral surfaces without slipping, and together with the bolt fastening, the powerful rolling torque can be transmitted reliably and effectively. It is possible to improve the reliability of the rolling effect, and since the joint surface is polygonal, it is also effective for positioning the assembly with respect to each other.Since the joint surface is formed around the shaft clamp part, the fastening bolt is A plurality of rolls can be arranged over the joint surface, and both are double and firmly fixed, which is particularly advantageous as an assembly structure for rolls of this type that require a strong rolling action.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a rolling roll to which the present invention is applied;
The figure is a detailed explanatory diagram of the conventional rolling roll structure, FIGS. 3A and 3B are half longitudinal sectional front views of the embodiment of the roll of the present invention, and FIGS. 3C and 3D are the same as those shown in FIGS. Figure 3B
FIG. 3... Roll roll, 5a... Rolling zone, 5b... Smooth zone, 5... Rolling section, 6a... Shaft clamp section, 6b... Face gear section, 6... Support section, 7, 8
...Rotating shaft, 9, 10... Joint uneven portion for transmitting rolling torque, 13... Fastening bolt.

Claims (1)

[Scope of Claims] 1. A rolling roll used in a three-roll planetary mill, which is divided into a rolling part having a substantially truncated conical shape that contacts a material to be rolled, and a supporting part connected to a rotating shaft. In the configuration, a shaft clamp portion for connecting the rotating shaft is provided at an axial center portion of the support portion, a face gear portion is provided on an end surface of the support portion coaxially with the shaft clamp portion,
Further, a convex portion or a concave portion having a polygonal circumferential surface is provided on an end surface of the supporting portion opposite to the face gear portion, and is coaxial with the shaft clamp portion; A concave part or a convex part having a polygonal peripheral surface that fits into the convex part or the concave part is provided coaxially with the outer peripheral surface of the rolling part, and the supporting part and the rolling part are connected via the concave part and the bolt. An assembly roll for a three-roll planetary mill, characterized in that it is removably fixed via a .