An assembled roller thrust ring and a manufacturing method thereof

Abstract

The present invention discloses an assembled roller thrust ring, belonging to the field of metallurgical equipment parts, comprising an outer sleeve and an inner sleeve. The outer sleeve is cylindrical with a gate-shaped cross section. The inner shoulder of the outer sleeve is provided with a step 1, the inner diameter of the upper portion of the step 1 being smaller than the inner diameter of the lower portion, and a boss is provided at the step of the step 1. The inner sleeve is a trapezoidal cylindrical structure with multiple irregular steps provided on the outer wall. The outer shoulder of the inner sleeve is provided with a step 2, the outer diameter of the upper portion of the step 2 being smaller than the outer diameter of the lower portion, and a slot is provided at the step of the step 2. After the outer sleeve and the inner sleeve are assembled, the cylindrical surfaces at the step 1 and the step 2 are interference-fitted, and the boss and the slot engage with each other. The present application splits a heavy and complex ring into two smaller rings with a simpler structure, reducing the amount of blank for deep ring grooves, thereby reducing the rough-to-net ratio of the thrust ring blank, facilitating processing, and saving cost and time.

Description

Technical Field

[0001] The invention belongs to the field of metallurgical equipment parts, and particularly relates to an assembled roller thrust ring and a manufacturing method thereof. Background Art

[0002] Due to the large diameter of the roughing vertical rolls in hot strip mills, the thrust rings mounted on both ends are also quite large. In particular, the lower end thrust ring has an outer diameter of 1050-1100mm, a length of 390-460mm, and a weight of 0.9-1.15 tons per unit. The end face also features a ring groove 65mm wide and 175-215mm deep. These rolls are typically produced through integral casting or forging. However, their large size, complex shape, and high roughness-to-net ratio make these processes difficult to produce. The deep ring grooves also present machining challenges. Machining on horizontal lathes is too long and heavy, resulting in insecure clamping. Deep grooves on vertical lathes are difficult to remove chips, impacting machining efficiency. Furthermore, the excessive tool protrusion during deep groove machining can easily cause vibration, resulting in chatter marks and slowing down turning speeds. The groove ribs also hinder grinding of the sealing surface. These factors lead to extremely long production cycles for large roll thrust rings, often impacting roll delivery times. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a method for manufacturing an assembled roller thrust ring, thereby reducing the difficulty in manufacturing such a large thrust ring.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A assembled roller thrust ring includes an outer sleeve and an inner sleeve. The outer sleeve is barrel-shaped with a gate-shaped cross-section. A step platform 1 is provided on the inner shoulder of the outer sleeve. The inner diameter of the upper part of the step platform 1 is smaller than the inner diameter of the lower part, and a boss is provided at the step of the step platform 1. The inner sleeve is barrel-shaped with a large mouth facing upward. A step platform 2 is provided on the outer shoulder of the inner sleeve. The outer diameter of the upper part of the step platform 2 is smaller than the outer diameter of the lower part, and a slot is provided at the step of the step platform 2. After the outer sleeve and the inner sleeve are assembled, the cylindrical surfaces at the step platform 1 and the step platform 2 are interference fit, and the boss and the slot engage with each other.

[0006] A further improvement of the technical solution of the present invention is that after the outer sleeve and the inner sleeve are assembled, the interference of the cylindrical surfaces at the step platform 1 and the step platform 2 is 0.4-0.6mm.

[0007] A further improvement of the technical solution of the present invention is that: the boss is arranged around the inner wall of the outer sleeve, and the clamping groove is arranged around the outer wall of the inner sleeve.

[0008] A further improvement of the technical solution of the present invention is that the distances from the lower end surfaces of the boss and the clamping groove to the bottom surface of the large roller thrust ring groove formed after assembly are equal.

[0009] A further improvement of the technical solution of the present invention is that the inner diameter of the upper part of step platform 1 differs from that of the lower part by 10 mm, and the outer diameter of the upper part of step platform 2 differs from that of the lower part by 10 mm.

[0010] A further improvement of the technical solution of the present invention is that the height of the boss is 0.4-0.5 mm, the depth of the groove is 0.6-0.7 mm, and after assembly, there is a gap of 0.1-0.3 mm in the radial direction between the boss and the groove.

[0011] A further improvement of the technical solution of the present invention is that the vertical heights of the boss and the slot on the outer sleeve and the inner sleeve respectively are 10-15 mm, and after assembly, the height of the boss is 0.3-0.4 mm smaller than that of the slot.

[0012] A method for manufacturing an assembled roller thrust ring comprises the following steps:

[0013] S1. Forge or cast the rough inner and outer sleeves according to the drawings;

[0014] S2. Rough-process the inner sleeve and outer sleeve after casting or forging, and then heat treat them;

[0015] S3, finish machining each part, machining a circle of bosses and grooves on the outer sleeve and inner sleeve respectively, and precisely controlling their positions;

[0016] S4, heating the jacket to a predetermined temperature of 150-170°C;

[0017] S5. Place the inner sleeve with the large diameter facing upwards, lift the outer sleeve vertically to the top of the inner sleeve, and slowly lower it to fit the inner sleeve until the boss is aligned with the slot. At this point, it cannot fall any further and the lifting device is removed.

[0018] S6. Cool to room temperature, and insert the boss into the slot to connect the outer sleeve and the inner sleeve into a whole.

[0019] A further improvement of the technical solution of the present invention is that in step S4, an electromagnetic induction heater is used to heat the jacket.

[0020] Due to the adoption of the above technical solution, the technical advancements achieved by the present invention are:

[0021] Through the above scheme, the present invention splits a heavy and complex ring into two small rings with light weight and simple structure. Since the amount of blanks of the deep ring groove is reduced, the net-to-grain ratio of the thrust ring blank is reduced, which facilitates processing; changing a whole thrust ring into two rings reduces the requirements for the clamping capacity of the processing equipment, and can be processed on vertical and horizontal lathes; the processing difficulty is reduced, because the side and bottom surfaces of the deep ring groove are processed before assembly and do not need to be processed again after assembly, the chip removal and tool vibration problems in the original technology of processing deep ring grooves are eliminated, and the processing efficiency and surface quality are improved; compared with the increased processing and assembly costs and time of the mating surface, the saved costs and time are still relatively large, so its economic benefits are very obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a cross-sectional view of the assembly of the large roller thrust ring of the present invention;

[0023] Figure 2 This is an enlarged view of the structure of the boss and groove matching of the present invention;

[0024] Figure 3 is a cross-sectional view of a jacket of the present invention;

[0025] Figure 4 It is a cross-sectional view of the inner sleeve of the present invention;

[0026] Among them: 1. Inner sleeve, 2. Outer sleeve, 3. Boss, 4. Groove. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is described in detail below in conjunction with specific embodiments.

[0028] A large roller thrust ring, such as Figure 1-4 As shown, it comprises an outer sleeve 2 and an inner sleeve 1. The outer sleeve 2 is cylindrical with a gate-shaped cross-section. A step 1 is provided on the inner shoulder of the outer sleeve 2. The inner diameter of the upper portion of the step 1 is smaller than that of the lower portion, and a boss 3 is provided at the step of the step 1. The inner sleeve 1 is a trapezoidal cylindrical structure with multiple irregular steps on the outer wall. A step 2 is provided on the outer shoulder of the inner sleeve 1. The outer diameter of the upper portion of the step 2 is smaller than that of the lower portion, and a slot 4 is provided at the step of the step 2. When the outer sleeve 2 and inner sleeve 1 are assembled, the cylindrical surfaces of the step 1 and the step 2 are interference fit, and the boss 3 and the slot 4 interlock. The outer sleeve 2 and inner sleeve 1 are assembled to form a solid, integral thrust ring.

[0029] The outer sleeve 2 and inner sleeve 1 have an interference fit of 0.4-0.6mm, preventing them from rotating relative to each other after assembly. A circle of interlocking bosses 3 and grooves 4 are machined on the mating cylindrical surfaces of the outer sleeve 2 and inner sleeve 1. The lower end faces of the bosses 3 and grooves 4 are equidistant from the bottom surface of the large roller thrust ring groove formed after assembly, preventing the outer sleeve 2 and inner sleeve 1 from axially moving relative to each other after assembly.

[0030] The upper diameter of step 1 is smaller than the lower diameter, with a difference of 10 mm. The inner diameter of the upper portion of step 1 is substantially the same as the outer diameter of the upper portion of step 2, and the inner diameter of the lower portion of step 2 is substantially the same as the outer diameter of the lower portion of step 2. During assembly, the steps can accurately position the outer sleeve 2 and the inner sleeve 1 in the axial direction, so that the upper and lower end surfaces are aligned.

[0031] The boss 3 and the groove 4 form a slot structure. The boss 3 is 0.4-0.5mm high, and the groove 4 is 0.6-0.7mm deep. After assembly, the radial clearance between the boss 3 and the groove 4 is 0.1-0.3mm. The boss 3 and the groove 4 are 10-15mm high in the vertical direction of the outer sleeve 2 and the inner sleeve 1, respectively. After assembly, the boss 3 is 0.3-0.4mm lower than the groove 4. After shrink fitting, the boss 3 is embedded in the groove 4.

[0032] During production, the manufacturing method of this assembled roller thrust ring includes the following steps:

[0033] S1. Forge or cast the rough inner sleeve 1 and outer sleeve 2 according to the drawings;

[0034] S2, rough-processing the inner sleeve 1 and the outer sleeve 2 which have been cast or forged and then heat-treating them;

[0035] S3, finishing each part, processing a circle of boss 3 and slot 4 on the outer sleeve 2 and the inner sleeve 1 respectively, and accurately controlling their positions;

[0036] S4, heating the jacket 2 to 150-170° C. using an electromagnetic induction heater;

[0037] S5. Place the inner sleeve 1 with the large diameter facing upwards, lift the outer sleeve 2 vertically to the top of the inner sleeve 1, and slowly lower it to fit over the inner sleeve 1 until the boss 3 is aligned with the slot 4. At this point, it stops falling and the lifting device is removed.

[0038] S6. After cooling to room temperature, the boss 3 is embedded in the slot 4, connecting the outer sleeve 2 and the inner sleeve 1 into a whole.

[0039] The present invention manufactures a conventional one-piece roller thrust ring in two parts: an inner sleeve and an outer sleeve. The two parts form an interference fit, and the mating surfaces are machined with bosses 3 and slots 4, interlocking to prevent axial and circumferential movement, resulting in a solid, integrated thrust ring. By replacing a single, integral thrust ring with two rings, the present invention reduces the clamping capacity requirements of the processing equipment and can be machined on both vertical and horizontal lathes, thus reducing the processing difficulty.

[0040] At the same time, the conventional preparation method of the thrust ring requires processing a deep ring groove, but during processing, it faces the problems of chip removal and tool vibration of the deep ring groove. At the same time, the overall thrust ring is large and difficult to process. It is changed to two rings for processing, and the inner sleeve 1 and the outer sleeve 2 are processed respectively. The special structure of the inner wall of the outer sleeve 2 and the outer wall of the inner sleeve produces a deep ring groove after assembly, and does not need to be processed after assembly, which solves the various problems in the original deep ring groove processing.

Claims

1. An assembled roller thrust ring, characterized in that: The invention comprises an outer sleeve (2) and an inner sleeve (1), wherein the outer sleeve (2) is in the shape of a cylinder and has a gate-shaped cross section, a step platform 1 is provided on the inner shoulder of the outer sleeve (2), the inner diameter of the upper part of the step platform 1 is smaller than the inner diameter of the lower part, and a boss (3) is provided at the step of the step platform 1, the inner sleeve (1) is in the shape of a trapezoidal cylinder, and the outer wall is provided with multiple irregular steps, a step platform 2 is provided on the outer shoulder of the inner sleeve (1), the outer diameter of the upper part of the step platform 2 is smaller than the outer diameter of the lower part, and a slot (4) is provided at the step of the step platform 2, after the outer sleeve (2) and the inner sleeve (1) are assembled, the cylindrical surfaces of the step platform 1 and the step platform 2 are interference fit, and the boss (3) and the slot (4) are engaged with each other; after the outer sleeve (2) and the inner sleeve (1) are assembled, the interference amount of the cylindrical surfaces of the step platform 1 and the step platform 2 is 0.4-0.6mm; The platform (3) is arranged around the inner wall of the outer sleeve (2), and the groove (4) is arranged around the outer wall of the inner sleeve (1); the lower end faces of the boss (3) and the groove (4) are at equal distances from the bottom surface of the large roller thrust ring groove formed after assembly; the inner diameter of the upper part of the step platform 1 and the inner diameter of the lower part differ by 10 mm, and the outer diameter of the upper part of the step platform 2 and the outer diameter of the lower part differ by 10 mm; the height of the boss (3) is 0.4-0.5 mm, the depth of the groove (4) is 0.6-0.7 mm, and the radial clearance between the boss (3) and the groove (4) after assembly is 0.1-0.3 mm; the height of the boss (3) and the groove (4) in the vertical direction of the outer sleeve (2) and the inner sleeve (1) is 10-15 mm respectively, and the height of the boss (3) is 0.3-0.4 mm smaller than that of the groove (4) after assembly.

2. A method for manufacturing an assembled roller thrust ring, characterized in that: Manufacturing the roller thrust ring of claim 1 comprises the following steps: S1. Forge or cast the inner sleeve (1) and outer sleeve (2) respectively according to the drawings; S2, rough-machining the inner sleeve (1) and the outer sleeve (2) which have been cast or forged and then heat-treating them; S3, finishing each part, processing a circle of bosses (3) and grooves (4) on the outer sleeve (2) and the inner sleeve (1) respectively, and accurately controlling their positions; S4, heating the jacket (2) to a predetermined temperature; S5. Place the inner sleeve (1) with the large diameter facing upwards, lift the outer sleeve (2) vertically to the top of the inner sleeve (1), and slowly lower it to fit the inner sleeve (1) until the boss (3) is aligned with the slot (4). At this point, it stops falling and the lifting device is removed; S6. Cooling to room temperature, the boss (3) is embedded in the slot (4), and the outer sleeve (2) and the inner sleeve (1) are connected into a whole.

3. The method for manufacturing an assembled roller thrust ring according to claim 2, characterized in that: In step S4, the outer jacket (2) is heated using an electromagnetic induction heater, with the predetermined temperature being 150-170°C.

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