Skew Rolling Assembly and Method Suitable for Large-Size Superalloy Bars

Abstract

Disclosed is a skew rolling assembly suitable for large-size superalloy bars, including four rollers with completely identical shape and size, where the four rollers are all active rollers. In the production process, the four rollers play a role in promoting the forward flow of blank metal in a rolling direction, thus avoiding a rolling jamming phenomenon caused by the obstruction of guide plates to the forward flow of the blank in the rolling process of the prior art. The providing of the four rollers improves the rolling speed and increases the degree of deformation. Disclosed is a skew rolling method suitable for large-size superalloy bars. By utilizing the skew rolling assembly suitable for the large-size superalloy bars, and utilizing four rotating active rollers for the skew-rolling forming of bars, the rolling speed is improved, the problem that the cooperative rolling of two rollers and guide plates in the prior art is prone to the phenomenon of rolling jamming is avoided, the forming quality is guaranteed, the rolling production efficiency is improved, and the degree of deformation is increased.

Claims

1. A skew rolling assembly suitable for large-size superalloy bars, comprising: four rollers capable of rotating actively, wherein the rollers each are of an unequal-diameter rotary body structure; a straight line where a moving direction of a blank during rolling is located is used as a rolling line, and the four rollers are uniformly distributed around a circumferential direction of the rolling line.

2. The skew rolling assembly suitable for large-size superalloy bars according to claim 1, wherein the four rollers have the same size.

3. The skew rolling assembly suitable for large-size superalloy bars according to claim 2, wherein the ends having a large diameter of the four rollers are uniformly distributed around the rolling line to form a feed end of the blank.

4. The skew rolling assembly suitable for large-size superalloy bars according to claim 2, wherein the roller comprises a first truncated cone, a second truncated cone, a third truncated cone and a fourth truncated cone which are arranged coaxially and connected in sequence; an axial length ratio of the first truncated cone to the second truncated cone to the third truncated cone to the fourth truncated cone is 3:1:1:1, a roller surface cone angle of the first truncated cone is from 3 degrees to 4.5 degrees, a roller surface cone angle of the second truncated cone is from 3 degrees to 4 degrees, a roller surface cone angle of the third truncated cone is from 2 degrees to 3.5 degrees, a roller surface cone angle of the fourth truncated cone is from 1 degree to 3.5 degrees, and a rolling angle of the roller is from 5 degrees to 7 degrees.

5. The skew rolling assembly suitable for large-size superalloy bars according to claim 4, wherein a ratio of a throat diameter of the roller to a diameter of the blank is from 1.0 to 5.0, and a ratio of an axial length of the roller to the throat diameter of the roller is from 3.0 to 7.0.

6. The skew rolling assembly suitable for large-size superalloy bars according to claim 1, wherein a region enclosed by the four rollers is a deformation zone, and a spacing between the opposite rollers is adjustable; in a plane perpendicular to the rolling line, a spacing ratio of two pairs of rollers arranged at intervals is ellipticity, and the ellipticity in any plane perpendicular to the rolling line in the deformation zone is equal, and the ellipticity is from 1.0 to 1.1; in the deformation zone, a feeding angle is from 7 degrees to 9 degrees, the rolling angle is from 5 degrees to 7 degrees, the rotating speed of the roller is from 10 r/min to 11 r/min, and the diameter reduction rate is from 60% to 70%.

7. A skew rolling method suitable for large-size superalloy bars, which uses the skew rolling assembly suitable for large-size superalloy bars according to claim 1, wherein the four rollers all rotate around respective axes, and the heated blank enters the deformation zone enclosed by the four rollers for variable cross-section rolling, thus completing first-pass forward rolling.

8. The skew rolling method suitable for large-size superalloy bars according to claim 7, wherein the four rollers have the same size.

9. The skew rolling method suitable for large-size superalloy bars according to claim 8, wherein the ends having a large diameter of the four rollers are uniformly distributed around the rolling line to form a feed end of the blank.

10. The skew rolling method suitable for large-size superalloy bars according to claim 8, wherein the roller comprises a first truncated cone, a second truncated cone, a third truncated cone and a fourth truncated cone which are arranged coaxially and connected in sequence; an axial length ratio of the first truncated cone to the second truncated cone to the third truncated cone to the fourth truncated cone is 3:1:1:1, a roller surface cone angle of the first truncated cone is from 3 degrees to 4.5 degrees, a roller surface cone angle of the second truncated cone is from 3 degrees to 4 degrees, a roller surface cone angle of the third truncated cone is from 2 degrees to 3.5 degrees, a roller surface cone angle of the fourth truncated cone is from 1 degree to 3.5 degrees, and a rolling angle of the roller is from 5 degrees to 7 degrees.

11. The skew rolling method suitable for large-size superalloy bars according to claim 10, wherein a ratio of a throat diameter of the roller to a diameter of the blank is from 1.0 to 5.0, and a ratio of an axial length of the roller to the throat diameter of the roller is from 3.0 to 7.0.

12. The skew rolling method suitable for large-size superalloy bars according to claim 7, wherein a region enclosed by the four rollers is a deformation zone, and a spacing between the opposite rollers is adjustable; in a plane perpendicular to the rolling line, a spacing ratio of two pairs of rollers arranged at intervals is ellipticity, and the ellipticity in any plane perpendicular to the rolling line in the deformation zone is equal, and the ellipticity is from 1.0 to 1.1; in the deformation zone, a feeding angle is from 7 degrees to 9 degrees, the rolling angle is from 5 degrees to 7 degrees, the rotating speed of the roller is from 10 r/min to 11 r/min, and the diameter reduction rate is from 60% to 70%.

13. The skew rolling method suitable for large-size superalloy bars according to claim 7, wherein after the first-pass forward rolling is completed, rotation directions of the four rollers and the spacing between the rollers are adjusted for second-pass reverse rolling, the forward rolling and the reverse rolling are repeated until the rolling is completed, and then the blank is cooled; the blank is heated to 915? C. to 1,115? C., the heating time is T, the unit is min, and T=D.sub.b?(0.6?0.8), where D.sub.b is the diameter of the blank, and the unit is mm.

14. The skew rolling method suitable for large-size superalloy bars according to claim 8, wherein after the first-pass forward rolling is completed, rotation directions of the four rollers and the spacing between the rollers are adjusted for second-pass reverse rolling, the forward rolling and the reverse rolling are repeated until the rolling is completed, and then the blank is cooled; the blank is heated to 915? C. to 1,115? C., the heating time is T, the unit is min, and T=D.sub.b?(0.6?0.8), where D.sub.b is the diameter of the blank, and the unit is mm.

15. The skew rolling method suitable for large-size superalloy bars according to claim 9, wherein after the first-pass forward rolling is completed, rotation directions of the four rollers and the spacing between the rollers are adjusted for second-pass reverse rolling, the forward rolling and the reverse rolling are repeated until the rolling is completed, and then the blank is cooled; the blank is heated to 915? C. to 1,115? C., the heating time is T, the unit is min, and T=D.sub.b?(0.6?0.8), where D.sub.b is the diameter of the blank, and the unit is mm.

16. The skew rolling method suitable for large-size superalloy bars according to claim 10, wherein after the first-pass forward rolling is completed, rotation directions of the four rollers and the spacing between the rollers are adjusted for second-pass reverse rolling, the forward rolling and the reverse rolling are repeated until the rolling is completed, and then the blank is cooled; the blank is heated to 915? C. to 1,115? C., the heating time is T, the unit is min, and T=D.sub.b?(0.6?0.8), where D.sub.b is the diameter of the blank, and the unit is mm.

17. The skew rolling method suitable for large-size superalloy bars according to claim 11, wherein after the first-pass forward rolling is completed, rotation directions of the four rollers and the spacing between the rollers are adjusted for second-pass reverse rolling, the forward rolling and the reverse rolling are repeated until the rolling is completed, and then the blank is cooled; the blank is heated to 915? C. to 1,115? C., the heating time is T, the unit is min, and T=D.sub.b?(0.6?0.8), where D.sub.b is the diameter of the blank, and the unit is mm.

18. The skew rolling method suitable for large-size superalloy bars according to claim 12, wherein after the first-pass forward rolling is completed, rotation directions of the four rollers and the spacing between the rollers are adjusted for second-pass reverse rolling, the forward rolling and the reverse rolling are repeated until the rolling is completed, and then the blank is cooled; the blank is heated to 915? C. to 1,115? C., the heating time is T, the unit is min, and T=D.sub.b?(0.6?0.8), where D.sub.b is the diameter of the blank, and the unit is mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

[0023] FIG. 1 is a structural schematic diagram of a skew rolling assembly suitable for large-size superalloy bars according to the present disclosure:

[0024] FIG. 2 is a structural schematic diagram of a skew rolling assembly suitable for large-size superalloy bars according to the present disclosure from other angles:

[0025] FIG. 3 is a structural schematic diagram of a roller of a skew rolling assembly suitable for large-size superalloy bars according to the present disclosure:

[0026] FIG. 4 is a metallographic diagram of a blank before rolling in an embodiment of a skew rolling method suitable for large-size superalloy bars according to the present disclosure:

[0027] FIG. 5 is a metallographic diagram of a blank after first-pass rolling in an embodiment of a skew rolling method suitable for large-size superalloy bars according to the present disclosure.

[0028] In the drawings: 1roller: 2first truncated cone: 3second truncated cone: 4third truncated cone: 5fourth truncated cone: 6blank: [0029] ?rolling angle: ?.sub.1roller surface cone angle of first truncated cone: ?.sub.2roller surface cone angle of second truncated cone: ?.sub.3roller surface cone angle of third truncated cone: ?.sub.4roller surface cone angle of fourth truncated cone: L1axial length of first truncated cone: L2axial length of second truncated cone: L3axial length of third truncated cone: L4axial length of fourth truncated cone: R1throat radius of roller.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0031] An objective of the present disclosure is to provide a skew rolling assembly and method suitable for large-size superalloy bars, so as to solve the problems existing in the prior art, avoid the phenomenon of rolling jamming to the maximum extent, increase the degree of deformation, and improve the rolling production efficiency of the large-size superalloy bars.

[0032] To make the objectives, features and advantages of the present disclosure more apparently and understandably, the following further describes the present disclosure in detail with reference to the accompanying drawings and the specific embodiments.

[0033] Referring from FIG. 1 to FIG. 5. FIG. 1 is a structural schematic diagram of a skew rolling assembly suitable for large-size superalloy bars according to the present disclosure. FIG. 2 is a structural schematic diagram of a skew rolling assembly suitable for large-size superalloy bars according to the present disclosure from other angles. FIG. 3 is a structural schematic diagram of a roller of a skew rolling assembly suitable for large-size superalloy bars according to the present disclosure. FIG. 4 is a metallographic diagram of a blank before rolling in an embodiment of a skew rolling method suitable for large-size superalloy bars according to the present disclosure. FIG. 5 is a metallographic diagram of a blank after first-pass rolling in an embodiment of a skew rolling method suitable for large-size superalloy bars according to the present disclosure.

[0034] The skew rolling assembly suitable for large-size superalloy bars provided by the present disclosure includes four rollers 1 capable of rotating actively, where the rollers 1 each are of an unequal-diameter rotary body structure. A straight line where a moving direction of a blank 6 during rolling is located is used as a rolling line, and the four rollers 1 are uniformly distributed around a circumferential direction of the rolling line.

[0035] The skew rolling assembly suitable for large-size superalloy bars provided by the present disclosure employs four rollers 1 of the same structure, the four rollers 1 are all active rollers. In the production process, the four rollers 1 play a role in promoting the forward flow of blank 6 metal in a rolling direction, thus avoiding the phenomenon of rolling jamming caused by the obstruction of a guide plate to the forward flow of the blank 6 in the rolling process of the prior art. The providing of the four rollers 1 improves the rolling speed. In addition, by adjusting the rotation directions of the four rollers 1 and the spacing between the rollers 1, multi-pass reciprocating rolling can be achieved, the degree of deformation is increased, and the rolling production efficiency of the large-size superalloy bars is further improved.

[0036] The four rollers 1 are of the same structure and size.

[0037] In the specific embodiment, the ends having a large diameter of the four rollers 1 are uniformly distributed around the rolling line to form a feed end of the blank 6, as shown in FIG. 1 and FIG. 2.

[0038] Specifically, a throat diameter D.sub.1 of the roller 1 (D.sub.1=2R.sub.1, R.sub.1 is the throat radius) and the diameter D.sub.b of the blank 6 satisfy that D.sub.1/D.sub.b=1.0 to 5.0, and the body length L of the roller 1 and the throat diameter D.sub.1 of the roller 1 satisfy that L/D.sub.1=3.0 to 7.0. The roller 1 includes a first truncated cone 2, a second truncated cone 3, a third truncated cone 4 and a fourth truncated cone 5 which are arranged coaxially and connected in sequence. An axial length ratio of the first truncated cone 2 to the second truncated cone 3 to the third truncated cone 4 to the fourth truncated cone 5 is that L1:L2:L3:L4=3:1:1:1. A roller surface cone angle ?.sub.1 of the first truncated cone 2, a roller surface cone angle ?.sub.2 of the second truncated cone 3, a roller surface cone angle ?.sub.3 of the third truncated cone 4 and a roller surface cone angle ?.sub.4 of the fourth truncated cone 5 are from 3 degrees to 4.5 degrees, from 3 degrees to 4 degrees, from 2 degrees to 3.5 degrees, and from 1 degree to 3.5 degrees, respectively: and a rolling angle ? of the roller 1 is from 5 degrees to 7 degrees. In actual production, the size of the four rollers 1 can be adjusted according to the specification of the blank 6 and production requirements, thus improving the flexibility and adaptability of the skew rolling assembly.

[0039] It should also be emphasized that the spacing between the four rollers 1 can be adjusted, so as to adjust the specification of a deformation zone according to the bar rolling requirements, and further improve the adaptability of the skew rolling assembly.

[0040] More specifically, in a plane perpendicular to the rolling line, a spacing ratio of two pairs of rollers 1 placed in opposite is ellipticity, and the ellipticity in any plane perpendicular to the rolling line in the deformation zone is equal, and the ellipticity is from 1.0 to 1.1. The specification of the deformation zone can be adjusted by adjusting the ellipticity, thus satisfying different rolling requirements.

[0041] In addition to that, in the deformation zone, a feeding angle is from 7 degrees to 9 degrees, the rolling angle is from 5 degrees to 7 degrees, the rotating speed of the roller 1 is from 10 r/min to 11 r/min, and the diameter reduction rate is from 60% to 70%. In actual application, operating parameters of the roller 1 can be adjusted according to rolling production requirements.

[0042] Further, a skew rolling method suitable for large-size superalloy bars is further provided by the present disclosure, which uses the skew rolling assembly suitable for large-size superalloy bars above. The four rollers 1 all rotate around respective axes, and the heated blank 6 enters the region enclosed by the four rollers 1 for achieving first-pass forward rolling.

[0043] It should be noted that after first-pass forward rolling is completed, rotation directions of the four rollers 1 and the spacing between the rollers 1 may be adjusted for the second-pass rolling to further improve the rolling production efficiency. The forward rolling and the reverse rolling are repeated until the rolling is completed, and then the blank 6 is cooled to room temperature by air cooling or water cooling. In specific embodiment, the blank 6 employs superalloy GH4169 having a diameter from 300 mm to 500 mm and a length from 300 mm to 15,000 mm.

[0044] It also should be noted that during the heating of the blank 6, the blank 6 can be heated to 915? C. to 1,115? C. in a heating surface, the heating time is T, the unit is min, and T=D.sub.b?(0.6-0.8), where D.sub.b is the diameter of the blank 6, and the unit is mm.

[0045] In accordance with the skew rolling assembly and method suitable for large-size superalloy bars, four rollers 1 rotating in the same direction are circumferentially and uniformly distributed around the rolling center line at an interval of 90 degrees, and all four rollers 1 are power rollers for promoting the blank 6 metal to flow forward in the rolling direction, which not only solves the problem of rolling jamming caused by the obstruction of guide plates, but also improves the rolling speed. In the rolling process, the blank 6 is only in partial contact with the roller 1, and thus the forming load is low compared with the mainstream severe plastic deformation technology. The spacing between the rollers 1 is adjustable, and the rotation directions of the rollers 1 are adjustable. After the first-pass rolling, the spacing between the rollers 1 and the rotation directions of the rollers can be quickly adjusted, thus making the blank 6 to be subjected to the second pass-rolling in a direction opposite to the direction of the first-pass rolling. Thus, multi-pass reciprocating rolling can be carried out repeatedly, the rolling time is saved, and the rolling production efficiency is further improved. By utilizing the four rollers for skew rolling, on the premise of guaranteeing the smooth completion of the rolling process, the production cost is saved, and the production efficiency is improved.

Explanation of the Glossary

[0046] Rolling jamming refers to the phenomenon that the blank only rotates but does not advance or neither rotates nor advances in the rolling process.

[0047] Ellipticity: ellipticity herein means that in the plane perpendicular to the rolling line, a spacing ratio of two pairs of rollers 1 placed in opposite is ellipticity, and the ellipticity is required to be ?1. (Specifically, the ellipticity is a value obtained by comparing a spacing value of two opposite rollers 1 having a larger spacing with a spacing value of the other two opposite rollers 1 having a smaller spacing).

[0048] Several examples are used for illustration of the principles and implementation methods of the present disclosure. The description of the embodiments is merely used to help illustrate the method and its core principles of the present disclosure. In addition, those of ordinary skill in the art can make various modifications in terms of specific embodiments and scope of application in accordance with the teachings of the present disclosure. In conclusion, the content of this specification shall not be construed as a limitation to the present disclosure.