Method for achieving hot ring rolling coordinated deformation of double-metal ring piece

Abstract

A method for realizing hot ring rolling coordinated deformation of a bimetallic ring piece belongs to the technical field of bimetallic ring piece manufacturing, and is characterized by comprising the following steps: 1) obtaining a bimetallic ring blank before hot ring rolling through a centrifugal casting process; the method comprises the following steps of (1) firstly, increasing the rotating speed of a driving roller to 0.34 rad / s-0. 6 rad / s so as to increase the deformation of an outer layer to 30%-60%, keeping the feeding speed of a core roller to 1.5 mm / s-0. 48rad / s and keeping the deformation of an inner layer to 15%-30%, (3) then reducing the rotating speed of the driving roller to 0.30 rad / s-0. 48rad / s and increasing the feeding speed of the core roller to 2.0 mm / s-0. 5mm / s, and (4) finally reducing the feeding speed of the core roller to 1.5 mm / s-0. 48rad / s and keeping the rotating speed of the driving roller to 0.30 rad / s-0. 48rad / s until ring rolling is finished.

Description

Technical Field

[0001] The invention belongs to the technical field of bimetallic ring manufacturing, and in particular relates to a method for realizing hot rolling coordinated deformation of a bimetallic ring. Background Art

[0002] At present, there are many ways to manufacture bimetallic ring parts, which can be roughly divided into two categories: one is a mechanical bonding method in which two single-metal ring parts are nested, and the double-layer material ring is extruded to a predetermined size by relying on the friction of the contact surface to obtain a bimetallic ring. The bimetallic rings produced by this mechanical bonding method have low contact interface bonding strength, and it is difficult to meet the requirements for ring interface bonding stability in certain high-load working scenarios. At the same time, this type of method has a long production process and cumbersome production procedures, which is not conducive to the company's production goals of reducing costs and increasing efficiency. The other type is the casting metallurgical composite method, which is to cast two layers of molten metal in a mold in succession through production means such as centrifugal casting, and obtain a bimetallic ring with metallurgical composite conditions in the bonding area after cooling and forming. The ring parts manufactured by this method cannot meet the requirements of use strength due to coarse internal structure and easy defects.

[0003] Against this backdrop, a new, shortened manufacturing process for large bimetallic composite rings based on hot rolling of centrifugally cast billets has been proposed. The main production process is: centrifugally cast bimetallic ring billets – hot rolling – machining – heat treatment. This production process not only ensures excellent bond strength at the bimetallic ring interface but also allows for convenient adjustment of the material thickness of the inner and outer layers by adjusting the ratio of centrifugally cast metal. Furthermore, the hot rolling process significantly improves the ring's internal structure and overall mechanical properties, effectively achieving the goals of efficient production, energy conservation, and emission reduction in the manufacturing industry. Summary of the Invention

[0004] The present invention provides a method for realizing hot rolling coordinated deformation of a bimetallic ring, which can effectively overcome the shortcomings of the prior art.

[0005] The object of the present invention is achieved by comprising the following steps:

[0006] (1) The bimetallic ring blank before hot rolling is obtained by centrifugal casting process. The geometric dimensions of the bimetallic ring blank are: outer diameter D 01 、Inner layer inner diameter D 02 , Ring blank height H0, Ring blank outer wall thickness B 01 , Ring blank inner wall thickness B 02 Without considering the height change of the bimetallic ring blank after hot rolling, the geometric dimensions of the bimetallic ring after hot rolling are: outer diameter D1, inner diameter D2, ring height H=H0, outer wall thickness B1, inner wall thickness B2;

[0007] (2) First, increase the speed of the driving roller to 0.34 rad / s~0.6 rad / s to increase the friction between it and the outer layer 40Cr with greater deformation resistance, thereby increasing the deformation of the outer layer to 30%~60%. At this time, keep the core roller feed speed at a low constant value of 1.5 mm / s~3.0 mm / s, and the deformation of the inner layer is at a low level of 15%~30%;

[0008] (3) Then reduce the driving roller speed to 0.30 rad / s~0.48 rad / s, increase the core roller feed speed to 2.0 mm / s~3.5 mm / s, increase the deformation of the inner layer Q345B with smaller deformation resistance to 20%~35%, while the deformation of the outer layer remains at 30%~60%;

[0009] (4) Finally, reduce the core roller feed speed to 1.5 mm / s~3.0 mm / s, and maintain the current feed speed of 1.5 mm / s~3.0 mm / s and the driving roller speed of 0.30 rad / s~0.48 rad / s in step (3) until the rolling is completed.

[0010] The advantages and beneficial effects of the present invention are: since the present invention comprehensively considers the differences in the driving roller rotation speed and the core rod feed speed, the changes in the deformation of the inner and outer layers, and explores the influence of different process parameters on the coordinated deformation of the hot rolling of bimetallic rings, it provides a process reference for achieving efficient and high-quality production of bimetallic rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the geometric dimension diagram of the bimetallic ring blank before hot rolling;

[0012] Figure 2 This is the geometric dimension diagram of the bimetallic ring after hot rolling;

[0013] In the figure: 1 - outer layer of bimetallic ring blank 2 - inner layer of bimetallic ring blank 3 - outer layer of bimetallic ring component 4 - inner layer of bimetallic ring component;

[0014] D 01 —Outer diameter of the bimetallic ring blank, D 02 —Inner diameter of the inner layer of the bimetallic ring blank, H0—Height of the bimetallic ring blank, B 01 — Bimetallic ring blank outer wall thickness, B 02 —the inner wall thickness of the bimetallic ring blank, d0—the inner diameter of the outer layer of the bimetallic ring blank and the outer diameter of the inner layer;

[0015] D1—outer diameter of the bimetallic ring, D2—inner diameter of the bimetallic ring, H—height of the bimetallic ring, B1—outer wall thickness of the bimetallic ring, B2—inner wall thickness of the bimetallic ring, d—outer inner diameter and inner outer diameter of the bimetallic ring. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 and Figure 2 Shown are the geometric dimension identification diagrams of the bimetallic ring blank and ring before and after hot rolling.

[0018] Example 1

[0019] In this embodiment, the process parameters for hot rolling of bimetallic rings are set as follows: the diameter of the driving roller is 800 mm, and the diameter of the core rod is 130 mm. The method for achieving coordinated deformation of the hot rolling of bimetallic rings is mainly achieved through the following steps:

[0020] (1) The bimetallic ring blank before hot rolling was obtained by centrifugal casting. The geometric dimensions of the bimetallic ring blank were: outer diameter of the outer layer 180 mm, inner diameter of the inner layer 100 mm, ring blank height 95 mm, and the wall thickness of the inner and outer layers of the ring blank were both 20 mm. Without considering the height change of the bimetallic ring blank after hot rolling, the geometric dimensions of the bimetallic ring after hot rolling were: outer diameter of the outer layer 300 mm, inner diameter of the inner layer 260 mm, ring height 95 mm, and the wall thickness of the inner and outer layers of the ring were both 10 mm.

[0021] (2) First, increase the speed of the driving roller to 0.34 rad / s to increase the friction between it and the outer layer 40Cr with greater deformation resistance, thereby increasing the deformation of the outer layer to 30%. At this time, keep the core roller feed speed at a low constant value of 1.5 mm / s, and the deformation of the inner layer is at a low level of 15%;

[0022] (3) Then, the driving roller speed was reduced to 0.3 rad / s, the core roller feed speed was increased to 2.0 mm / s, and the deformation of the inner layer Q345B with smaller deformation resistance was increased to 20%, while the deformation of the outer layer was maintained at 30%;

[0023] (4) Finally, reduce the core roller feed speed to 1.5 mm / s and maintain the current feed speed of 1.5 mm / s and the driving roller speed of 0.3 rad / s in step (3) until the rolling is completed.

[0024] Example 2

[0025] In this embodiment, the process parameters for hot rolling of bimetallic rings are set as follows: the diameter of the driving roller is 800 mm, and the diameter of the core rod is 130 mm. The method for achieving coordinated deformation of the hot rolling of bimetallic rings is mainly achieved through the following steps:

[0026] (1) The bimetallic ring blank before hot rolling was obtained by centrifugal casting. The geometric dimensions of the bimetallic ring blank were: outer diameter of the outer layer 180 mm, inner diameter of the inner layer 100 mm, ring blank height 95 mm, and the wall thickness of the inner and outer layers of the ring blank were both 20 mm. Without considering the height change of the bimetallic ring blank after hot rolling, the geometric dimensions of the bimetallic ring after hot rolling were: outer diameter of the outer layer 300 mm, inner diameter of the inner layer 260 mm, ring height 95 mm, and the wall thickness of the inner and outer layers of the ring were both 10 mm.

[0027] (2) First, increase the speed of the driving roller to 0.48 rad / s to increase the friction between it and the outer layer 40Cr with greater deformation resistance, thereby increasing the deformation of the outer layer to 50%. At this time, keep the core roller feed speed at a low constant value of 2.5 mm / s, and the deformation of the inner layer is at a low level of 25%.

[0028] (3) Then, the driving roller speed was reduced to 0.4 rad / s, the core roller feed speed was increased to 2.7 mm / s, and the deformation of the inner layer Q345B with smaller deformation resistance was increased to 30%, while the deformation of the outer layer was maintained at 50%;

[0029] (4) Finally, reduce the core roller feed speed to 2.5 mm / s, maintain the current feed speed of 3 mm / s and the driving roller speed of 0.4 rad / s in step (3) until the rolling is completed.

[0030] Example 3

[0031] In this embodiment, the process parameters for hot rolling of bimetallic rings are set as follows: the diameter of the driving roller is 800 mm, and the diameter of the core rod is 130 mm. The method for achieving coordinated deformation of the hot rolling of bimetallic rings is mainly achieved through the following steps:

[0032] (1) The bimetallic ring blank before hot rolling was obtained by centrifugal casting. The geometric dimensions of the bimetallic ring blank were: outer diameter of the outer layer 180 mm, inner diameter of the inner layer 100 mm, ring blank height 95 mm, and the wall thickness of the inner and outer layers of the ring blank were both 20 mm. Without considering the height change of the bimetallic ring blank after hot rolling, the geometric dimensions of the bimetallic ring after hot rolling were: outer diameter of the outer layer 300 mm, inner diameter of the inner layer 260 mm, ring height 95 mm, and the wall thickness of the inner and outer layers of the ring were both 10 mm.

[0033] (2) First, increase the speed of the driving roller to 0.6 rad / s to increase the friction between it and the outer layer 40Cr with greater deformation resistance, thereby increasing the deformation of the outer layer to 60%. At this time, keep the core roller feed speed at a low constant value of 3.0 mm / s, and the deformation of the inner layer is at a low level of 30%;

[0034] (3) Then, the driving roller speed was reduced to 0.48 rad / s, the core roller feed speed was increased to 3.5 mm / s, and the deformation of the inner layer Q345B with smaller deformation resistance was increased to 35%, while the deformation of the outer layer remained at 60%;

[0035] (4) Finally, reduce the core roller feed speed to 3.0 mm / s and maintain the current feed speed of 3.0 mm / s and the driving roller speed of 0.48 rad / s in step (3) until the rolling is completed.

Claims

1. A method for achieving hot rolling coordinated deformation of bimetallic rings, characterized in that To do this, follow these steps: (1) The bimetallic ring blank before hot rolling is obtained by centrifugal casting process. The geometric dimensions of the bimetallic ring blank are: outer diameter D 01 、Inner layer inner diameter D 02 , ring blank height H0, ring blank outer wall thickness B 01 , Ring blank inner wall thickness B 02 Without considering the height change of the bimetallic ring blank after hot rolling, the geometric dimensions of the bimetallic ring after hot rolling are: outer diameter D1 of the outer layer, inner diameter D2 of the inner layer, height H=H0 of the ring, outer wall thickness B1 of the ring, and inner wall thickness B2 of the ring; (2) First, increase the speed of the driving roller to 0.34 rad / s~0.6 rad / s to increase the friction between it and the outer layer 40Cr with greater deformation resistance, thereby increasing the deformation of the outer layer to 30%~60%. At this time, keep the core roller feed speed at a low constant value of 1.5 mm / s~3.0 mm / s, and the deformation of the inner layer is at a low level of 15%~30%; (3) Then reduce the speed of the driving roller to 0.30 rad / s~0.48 rad / s, increase the core roller feed speed to 2.0 mm / s~3.5 mm / s, increase the deformation of the inner layer Q345B with smaller deformation resistance to 20%~35%, while the deformation of the outer layer remains at 30%~60%; (4) Finally, reduce the core roller feed speed to 1.5 mm / s~3.0 mm / s, and maintain the current feed speed of 1.5 mm / s~3.0 mm / s and the drive roller speed of 0.30 rad / s~0.48 rad / s in step (3) until the rolling is completed.

2. A method for achieving coordinated deformation of bimetallic rings by hot rolling according to claim 1, characterized in that: The outer layer of the bimetallic ring may be made of a material with greater deformation resistance such as 40Cr steel, 42CrMo steel, 35CrMo steel, and the inner layer may be made of a material with less deformation resistance such as Q345B, Q235B, 25Mn, etc.

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