A vertical rolling process with auxiliary end press

Abstract

The present application relates to the field of forging forming, in particular to a vertical rolling process with auxiliary end pressing, comprising the following steps: S1: vertical material supporting plates are arranged at both ends of the core roller of the vertical rolling mill, and an abutting component is arranged on the material supporting plate, the abutting component comprises at least one rolling device, and a rotatable roller is arranged on the rolling device; S2: the position of the material supporting plate is adjusted, so that the roller is located at the terminal position of the end face of the annular forging in this rolling; S3: the vertical rolling mill is started, and the main roller rolls the outer shape of the annular forging, and the core roller rolls the inner shape of the annular forging. The material supporting plate with the rolling device is arranged at both ends of the core roller of the vertical rolling mill, the roller on the rolling device abuts against the end face of the annular forging after being elongated, plays a role in axially limiting the annular forging, and the rolling friction between the annular forging and the roller reduces the frictional heat of the end face of the annular forging, plays a role in protecting the annular forging, and improves the rolling quality of the annular forging.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of forging forming, in particular to a vertical rolling process with auxiliary end pressing. BACKGROUND

[0002] The vertical rolling process method is commonly used in the rolling production process of ring forgings. The process method is characterized by only rolling in the radial direction of the ring forging, without end pressing in the axial direction. The advantage of this process method is that a vertical rolling mill is used, which has a small footprint, fast and convenient loading and unloading, simple operation, and is suitable for small size inner hole ring rolling forming. However, the disadvantage is that there is no end pressing in the axial direction, which will lead to serious axial lengthening and high quality problems such as end face pits of the ring forging.

[0003] At the same time, the process method has high requirements for the regularity of the geometric size of the ring forging blank. The blank should not have shape defects such as trumpet shape and inner diameter surface step, otherwise the blank will lose stability during vertical rolling, which will cause the ring forging to swing or move left and right on the core roller, and generate high-speed sliding friction with the side of the vertical rolling mill or the supporting plate. As a result, the end face of the ring forging is scratched, and even generates frictional heat and overburning.

[0004] Therefore, there is a need for a technical solution to solve the technical problem that the ring forging rotates while abutting against the supporting plate during the processing of the ring forging, the friction between the supporting plate and the ring forging is large, which easily causes the end face of the ring forging to heat up, leading to overheat or overburning of the ring forging. SUMMARY

[0005] The present application aims to solve the technical problem that the ring forging rotates while abutting against the supporting plate during the processing of the ring forging, the friction between the supporting plate and the ring forging is large, which easily causes the end face of the ring forging to heat up, leading to overheat or overburning of the ring forging, by providing a vertical rolling process with auxiliary end pressing.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0007] A vertical rolling process with auxiliary end pressing, comprising the following steps:

[0008] S1: A vertical supporting plate is arranged at both ends of the core roller of the vertical rolling mill, and an abutting component is arranged on the supporting plate, the abutting component comprising at least one rolling device, and a rotatable roller is arranged on the rolling device;

[0009] S2: Adjust the position of the supporting plate so that the roller is located at the end position of the end face of the ring forging in this rolling;

[0010] S3: Start the vertical rolling mill, and the main roller rolls the outer shape of the ring forging, and the core roller rolls the inner shape of the ring forging.

[0011] The vertical rolling process with auxiliary end pressure is characterized in that a material supporting plate with a rolling device is arranged at each end of the core roller of the vertical rolling mill, and the end face of the ring-shaped forge piece abuts against the roller on the rolling device when the ring-shaped forge piece grows, so that the sliding friction between the end face of the ring-shaped forge piece and the material supporting plate is changed into the rolling friction between the end face of the ring-shaped forge piece and the roller on the rolling device, which not only plays a role in axially limiting the ring-shaped forge piece to avoid the large axial movement of the ring-shaped forge piece during rolling, but also reduces the frictional heat of the end face of the ring-shaped forge piece to play a role in protecting the ring-shaped forge piece and improving the rolling quality of the ring-shaped forge piece.

[0012] As a preferred scheme of the present application, the rotating speed of the main roller of the vertical rolling mill is set to 1.0 rad / s-1.5 rad / s. During the rotation of the ring-shaped forge piece with the main roller, the linear speed of the end face of the ring-shaped forge piece is less than 500 mm / s, and the rotating speed of the main roller can adapt to the normal forming of the ring-shaped forge piece, and at the same time, the rotating speed is not too high to cause too much friction between the end face of the ring-shaped forge piece and the rolling device, so as to be beneficial to reducing the temperature rise of the end face of the ring-shaped forge piece and playing a role in protecting the ring-shaped forge piece.

[0013] As a preferred scheme of the present application, the radial feeding speed of the core roller of the vertical rolling mill is less than 1.5 mm / s. The growth speed of the outer diameter of the ring-shaped forge piece is less than 3 mm / s, which effectively controls the real-time axial height of the ring-shaped forge piece during rolling, so as to avoid the radial impact of the end face of the ring piece on the rolling device when the axial height of the ring-shaped forge piece is sharply increased, to protect the rolling device, to ensure the smooth progress of the rolling process, to avoid the generation of pit defects on the end face of the ring-shaped forge piece, to reduce the friction between the ring-shaped forge piece and the roller, and to reduce the frictional heat of the end face of the ring-shaped forge piece.

[0014] As a preferred scheme of the present application, the deformation amount of the ring-shaped forge piece in single rolling is less than 20%. By controlling the total length of the radial feeding of the core roller during single rolling, the deformation amount of the ring-shaped forge piece is controlled, the rolling quality of the ring-shaped forge piece is improved, and at the same time, the deformation amount of the ring-shaped forge piece is controlled within a certain range, so as to avoid the axial limitation of the ring-shaped forge piece from the roller after the ring-shaped forge piece grows.

[0015] As a preferred scheme of the present application, the rolling device comprises two fixed seats, a needle roller bearing is arranged on the fixed seat, and the end of the roller is connected with the needle roller bearing. The roller is suspended on the material supporting plate through the two fixed seats, so that the roller can rotate correspondingly during the abutment of the roller and the ring-shaped forge piece, and the needle roller bearing has strong radial load bearing capacity. A perforated stamping outer ring needle roller bearing, i.e. HK series, is selected, and the radial rated load of a single needle roller bearing is greater than 10 KN, so that the roller can maintain stable rolling capacity under the force of the ring-shaped forge piece, and the rolling friction between the roller and the ring-shaped forge piece is effectively reduced.

[0016] As a preferred scheme of the present application, the fixed seat is provided with a boss on one side end face, the boss is provided with a through hole, and the needle roller bearing is arranged in the through hole. The boss can reduce the interference caused by the fixed seat to the rotation of the annular forging, and the through hole on the boss is used for mounting the roller to realize the rotatable mounting of the roller on the fixed seat.

[0017] As a preferred scheme of the present application, the roller is provided with a connecting column at each end, the connecting column is coaxially arranged with the roller, the diameter of the connecting column is smaller than that of the roller, and the connecting column is used for connecting with the inner ring of the needle roller bearing. The connecting column is coaxially arranged at each end of the roller, and the roller side part can protrude the top surface of the boss through the connection of the connecting column and the needle roller bearing on the fixed seat, so that the interference problem between the annular forging and the fixed seat can be conveniently avoided.

[0018] As a preferred scheme of the present application, the abutting component comprises at least two rolling devices, and all the rolling devices are symmetrically distributed on both sides of the material supporting plate. The covering area of the rolling device on the material supporting plate is increased, so that the material supporting plate can meet the rolling production of more rings, the contact area between the ring and the rolling device is increased, and the stable effect of the rolling device on the ring is improved.

[0019] As a preferred scheme of the present application, the number of the rolling devices on each material supporting plate is four, two of the rolling devices are horizontally arranged on the material supporting plate, and the other two of the rolling devices are obliquely arranged on the material supporting plate and gradually lowered along the center of the material supporting plate to both sides. The two horizontally arranged rolling devices can be arranged close to the horizontal center line of the ring according to the actual working condition of the equipment and the lengthening trend of the product forming process, so that the rotation direction of the horizontal rolling device is consistent with the rotation direction of the ring as much as possible. The position can cover most of the production of the ring, and the wear of the horizontal rolling device is reduced. The obliquely arranged rolling device can always abut against the lengthening ring and cover most of the production of the ring.

[0020] As a preferred scheme of the present application, one side of the material supporting plate is provided with an arc-shaped notch for avoiding the core roller. The core roller used for forming the inner shape of the annular forging can extend out of both ends of the annular forging through the arc-shaped notch. The core roller feeds along the radial direction of the annular forging at the arc-shaped notch, so that the annular forging grows more uniformly, and the forming quality of the annular forging is higher.

[0021] In summary, due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0022] The present application is provided with a material supporting plate with a rolling device at both ends of the core roll of the vertical rolling mill, the roller on the rolling device abuts against the end face of the long and large annular forging, which plays a role of axial limitation to the annular forging, and the rolling friction between the annular forging and the roller reduces the friction heat of the end face of the annular forging, which plays a role of protecting the annular forging and improving the rolling quality of the annular forging. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the arrangement of the rolling device on the material supporting plate according to the present application;

[0024] Figure 2 is a schematic diagram of the structure of the rolling device according to the present application;

[0025] Figure 3 is a schematic diagram of the structure of the roller according to the present application;

[0026] Figure 4 is a schematic diagram of the structure of the fixing seat according to the present application;

[0027] Figure 5 is a schematic diagram of the end face of the rolling device according to the present application;

[0028] Figure 6 is a schematic diagram of the processing process of a vertical rolling process with auxiliary end pressing according to the present application;

[0029] Marked in the figure: 1-material supporting plate, 11-arc-shaped notch, 2-abutting component, 21-rolling device, 211-roller, 2111-connecting column, 212-fixing seat, 2121-connecting hole, 2122-connecting bolt, 2123-convex platform, 2124-through hole, 2125-needle roller bearing, 2126-limiting step, 3-core roll, 4-annular forging. DETAILED DESCRIPTION

[0030] The present application will be described in detail below with reference to the accompanying drawings.

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0032] Example 1

[0033] As shown in Figure 1 , Figure 2 and Figure 6 , the present embodiment is a vertical rolling process with auxiliary end pressing, which includes the following steps:

[0034] S1: A vertical material supporting plate 1 is arranged at both ends of the core roll 3 of the vertical rolling mill, and an abutting component 2 is arranged on the material supporting plate 1, wherein the abutting component 2 comprises at least one rolling device 21, and a rotatable roller 211 is arranged on the rolling device 21;

[0035] S2: The position of the material supporting plate 1 is adjusted so that the roller 211 is located at the end position of the end surface of the annular forging 4 in the present rolling;

[0036] S3: The vertical rolling mill is started, the main roll rolls the outer shape of the annular forging 4, and the core roll 3 rolls the inner shape of the annular forging 4.

[0037] The material supporting plate 1 with the rolling device 21 is arranged at both ends of the core roll 3 of the vertical rolling mill, and the end surface of the annular forging 4 abuts against the roller 211 on the rolling device 21 after the annular forging 4 grows, so that the sliding friction between the end surface of the annular forging 4 and the material supporting plate 1 is changed into the rolling friction between the end surface of the annular forging 4 and the roller 211 on the rolling device 21, which not only plays a role in axially limiting the annular forging 4 to avoid the annular forging 4 from moving axially greatly during the rolling process, but also reduces the frictional heat of the end surface of the annular forging 4 to protect the annular forging 4 and improve the rolling quality of the annular forging 4.

[0038] Specifically, the rotating speed of the main roll of the vertical rolling mill is set to 1.0 rad / s-1.5 rad / s, so that the linear speed of the end surface of the annular forging 4 is less than 500 mm / s during the rotation of the main roll, and the rotating speed of the main roll can adapt to the normal forming of the annular forging 4, and at the same time, the rotating speed is not too high to cause too much friction between the end surface of the annular forging 4 and the rolling device 21, which is beneficial to reduce the temperature rise of the end surface of the annular forging 4 and protect the annular forging 4.

[0039] Specifically, the radial feeding speed of the core roll 3 of the vertical rolling mill is less than 1.5 mm / s, so that the outer diameter of the annular forging 4 grows at a speed less than 3 mm / s, which effectively controls the real-time axial lengthening degree of the annular forging 4 during the rolling process, thereby avoiding the radial impact of the end surface of the annular ring on the rolling device 21 when the annular forging 4 axially grows sharply, protecting the rolling device 21, ensuring the smooth progress of the rolling process, avoiding the generation of pit defects on the end surface of the annular forging 4, reducing the friction between the annular forging 4 and the roller 211, and reducing the frictional heat of the end surface of the annular forging 4.

[0040] Specifically, in a single rolling, the deformation amount of the annular forging 4 is less than 20%, and the total length of the radial feeding of the core roll 3 in a single rolling process is controlled to control the deformation amount of the annular forging 4, thereby improving the rolling quality of the annular forging 4, and also controlling the deformation amount of the annular ring at the end of the annular forging 4 within a certain range to avoid the annular forging 4 from being axially limited by the roller 211 after growing.

[0041] Specifically, the rolling device 21 comprises two fixed seats 212, the fixed seats 212 are provided with connecting holes 2121 and are fixed on the material supporting plate 1 through connecting bolts 2122, the fixed seats 212 are provided with needle roller bearings 2125, the ends of the rollers 211 are connected with the needle roller bearings 2125, the rollers 211 are suspended on the material supporting plate 1 through the two fixed seats 212, so that the rollers 211 can rotate correspondingly in the process of abutting against the annular forge piece 4, and meanwhile the needle roller bearings 2125 have strong radial load bearing capacity, the perforated stamping outer ring needle roller bearing 2125, i.e. HK series, is selected, the radial rated load of a single needle roller bearing 2125 is greater than 10 KN, so that the rollers 211 can maintain stable rolling capacity under the action of the annular forge piece 4, and the rolling friction between the rollers 211 and the annular forge piece 4 is effectively reduced.

[0042] Further, one side of the material supporting plate 1 is provided with an arc-shaped gap 11 for avoiding the core roller 3, the core roller 3 for forming the inner shape of the annular forge piece 4 can extend out of the two ends of the annular forge piece 4 through the arc-shaped gap 11, the core roller 3 feeds along the radial direction of the annular forge piece 4 at the arc-shaped gap 11, so that the annular forge piece 4 grows more uniformly as a whole, and the forming quality of the annular forge piece 4 is higher.

[0043] Embodiment 2

[0044] As shown in Figure 2 , Figure 3 , Figure 4 and Figure 5 , the difference between this embodiment and embodiment 1 is that one side end face of the fixed seat 212 is provided with a boss 2123, the boss 2123 is provided with a through hole 2124, and the needle roller bearing 2125 is arranged in the through hole 2124.

[0045] In this embodiment, the boss 2123 can reduce the interference of the fixed seat 212 on the rotation of the annular forge piece 4, the through hole 2124 on the boss 2123 is used for mounting the roller 211, and the rotatable mounting of the roller 211 on the fixed seat 212 is realized.

[0046] Specifically, the distance from the abutting side of the roller 211 to the top surface of the boss 2123 is d, 3mm≤d≤5mm, and the distance from the side of the roller 211 facing the fixed seat 212 to the bottom surface of the fixed seat 212 is h, 3mm≤h≤5mm.

[0047] Further, the two ends of the roller 211 are coaxially provided with connecting columns 2, the connecting columns 2111 are connected with the needle roller bearings 2125 on the fixed seat 212, so that the side of the roller 211 can protrude above the top surface of the boss 2123, thereby facilitating avoiding the interference problem between the annular forge piece 4 and the fixed seat 212.

[0048] Further, the inner wall of the through hole 2124 is provided with a limiting step 2126, the end face of the limiting step 2126 is arranged towards the side of the roller 211, the limiting step 2126 plays an axial limiting role on the needle roller bearing 2125 entering the through hole 2124, so that the needle roller bearing 2125 is more convenient to install and disassemble on the fixing base 212, and meanwhile the installation stability of the needle roller bearing 2125 in the through hole 2124 is ensured.

[0049] Embodiment 3

[0050] As shown in Figure 1 and Figure 2 In the embodiment, the difference from the embodiment 1 is that the abutting component 2 comprises at least two rolling devices 21, and all the rolling devices 21 are symmetrically distributed on both sides of the material supporting plate 1.

[0051] In the embodiment, the coverage of the rolling device 21 on the material supporting plate 1 is increased, so that the material supporting plate 1 can meet the rolling production of more rings, the contact area of the ring and the rolling device 21 is increased, and the stable effect of the rolling device 21 on the ring is improved.

[0052] Further, the number of the rolling devices 21 on each material supporting plate 1 is four, two rolling devices 21 are horizontally arranged on the material supporting plate 1, and two rolling devices 21 are obliquely arranged on the material supporting plate 1, and the roller 211 gradually decreases along the direction from the center of the material supporting plate 1 to both sides; wherein the two horizontally arranged rolling devices 21 are arranged close to the horizontal center line of the ring according to the actual working condition of the equipment and the lengthening trend of the product forming process, so as to ensure that the rotation direction of the horizontal rolling device 21 is consistent with the rotation direction of the ring as much as possible, so that the position can cover most of the production of the ring, and the wear of the horizontal rolling device 21 is reduced, the obliquely arranged rolling device 21 can always abut against the lengthening ring and cover most of the production of the ring, the included angle between the inclined roller 211 and the horizontal direction is α, α = 30° ± 5°, which facilitates the on-site installation of the rolling device 21, so that the interference between the four rolling devices 21 is small, and the axis of the roller 211 is consistent with the radial direction of the ring.

[0053] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vertical rolling process with auxiliary end pressure, characterized in that, Includes the following steps: S1: Vertical support plates (1) are provided at both ends of the vertical mill core roll (3). Abutment components (2) are provided on the support plates (1). The abutment components (2) include at least two rolling devices (21). All the rolling devices (21) are symmetrically distributed on both sides of the support plates (1). Rollers (211) that can rotate are provided on the rolling devices (21). The number of rolling devices (21) on each support plate (1) is four. Two rolling devices (21) are horizontally arranged on the support plates (1). The horizontal rolling devices (21) are arranged close to the horizontal center line of the ring. The two rolling devices (21) are inclined on the support plates (1). Along the center of the support plate (1) to both sides, the rollers (211) gradually decrease. The angle between the inclined rollers (211) and the horizontal direction is α, where α = 30° ± 5°. (211) The axis is consistent with the radial direction of the ring. The rolling device (21) includes two fixed seats (212). The fixed seats (212) are provided with needle roller bearings (2125). The end of the roller (211) is connected to the needle roller bearing (2125). A boss (2123) is provided on one side of the fixed seat (2122). A through hole (2124) is provided on the boss (2123). The needle roller bearing (2125) is located in the through hole (2124). The distance from the abutting side of the roller (211) and the ring forging (4) to the top surface of the boss (2123) is d, 3mm≤d≤5mm. The distance from the side of the roller (211) facing the fixed seat (212) to the bottom surface of the fixed seat (212) is h, 3mm≤h≤5mm. An arc-shaped notch (11) is provided on one side of the material support plate (1) to avoid the vertical mill core roller (3). S2: Adjust the position of the support plate (1) so that the roller (211) is located at the end position of the end face of the ring forging (4) in this rolling process; S3: Start the vertical rolling mill. The main roll rolls the outer shape of the ring forging (4), and the core roll (3) of the vertical rolling mill rolls the inner shape of the ring forging (4). The main roll speed of the vertical rolling mill is set to 1.0 rad / s-1.5 rad / s so that the end face linear velocity of the ring forging (4) is less than 500 mm / s during the rotation of the main roll.

2. The vertical rolling process with auxiliary end pressure according to claim 1, characterized in that, The radial feed speed of the core roll (3) of the vertical rolling mill is less than 1.5 mm / s.

3. The vertical rolling process with auxiliary end pressure according to claim 1, characterized in that, In a single rolling process, the deformation of the ring forging (4) is less than 20%.

4. The vertical rolling process with auxiliary end pressure according to claim 1, characterized in that, The roller (211) is provided with connecting posts (2111) at both ends. The connecting posts (2111) are coaxially arranged with the roller (211). The diameter of the connecting posts (2111) is smaller than the diameter of the roller (211). The connecting posts (2111) are used to connect with the inner ring of the needle roller bearing (2125).

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