Thin-walled metal ring precision rolling equipment

Abstract

The present application relates to a kind of thin-walled metal ring precision rolling equipment, including pedestal, to provide the fixation of the bottom of the rolling position of metal ring with fixed unit, to provide the pressure of the top of the rolling position of metal ring with pressurizing unit, to provide support for the rolling of metal ring with support unit cooperated with fixed unit and pressurizing unit and set in the outside of metal ring, for providing tensioning force for the rolling of metal ring with tensioning unit cooperated with support unit and set in the outside of metal ring;Drive unit is arranged cooperated with support unit and tensioning unit, and sensing unit is arranged cooperated with pressurizing unit, ring and tensioning unit.The present application limits the unnecessary movement of movable roller, improves the rolling precision, meets the manufacturing process requirements of metal ring;While improving precision, prevent the thickness of two end faces of metal ring after rolling from being uneven;Greatly simplify the rolling operation steps, improve the rolling efficiency;Prolong the service life of high-precision rolling equipment, reduce the maintenance cost of equipment.

Description

Technical Field

[0001] This invention relates to the technical field of manufacturing special metal articles, such as screws, wheels, rings, barrels, and balls, by rolling methods, and particularly to a precision rolling equipment for thin-walled metal rings in the field of metal ring rolling. Background Technology

[0002] A continuously variable transmission (CVT) is a transmission component that uses a drive belt and variable-diameter primary and driven pulleys to transmit power. It allows for continuous changes in the transmission ratio, thereby achieving optimal matching between the transmission system and engine operating conditions. The drive belt is an important component for the normal operation of a CVT. This drive belt is generally made of steel and includes metal rings and transverse elements.

[0003] The manufacturing process of metal rings mainly includes welding, heat treatment, cutting, deburring, rolling and stretching, and circumference straightening. Among these, rolling and stretching is the most crucial step in metal ring manufacturing, and the difficulty lies in controlling the rolling precision. Traditional rolling equipment has the following drawbacks when processing metal rings:

[0004] (1) It is difficult to meet the dimensional requirements of the metal ring process, rolling closed ring is difficult, and the rolls wear out severely;

[0005] (2) The rolls in the equipment have unnecessary movement, and there is relative displacement between the rolls during the processing, resulting in low rolling accuracy;

[0006] (3) The operation steps are relatively complicated and the rolling efficiency is low;

[0007] (4) The equipment has a short service life and high maintenance costs. Summary of the Invention

[0008] In order to overcome the shortcomings of existing rolling equipment, such as insufficient rolling accuracy and inconvenient operation, this invention proposes a precision rolling equipment for thin-walled metal rings.

[0009] The technical solution adopted by the present invention to solve its technical problem is a precision rolling equipment for thin-walled metal rings, the equipment including a base, and the base being equipped with:

[0010] A fixing unit is used to fix the bottom of the rolling position of the metal ring;

[0011] A pressurizing unit is used to provide top pressure at the rolling position of the metal ring;

[0012] A support unit, in conjunction with a fixing unit, a pressurizing unit, and a metal ring, is used to provide support for the rolling of the metal ring;

[0013] A tensioning unit, which is configured in conjunction with the support unit and located outside the metal ring, is used to provide tension force for the rolling of the metal ring;

[0014] A drive unit is provided to complement the support unit and the tensioning unit respectively;

[0015] Sensing units are provided in conjunction with the pressurization unit, the metal ring, and the tensioning unit.

[0016] Preferably, the base includes a horizontally arranged workbench with a mounting back plate on the workbench. The fixing unit is located on the workbench at one end of the back plate, and the pressurizing unit is located directly above the fixing unit and cooperates with the back plate. A support seat is located on the workbench at the other end of the back plate. The support seat and the fixing unit are located on the same side of the back plate, and the tensioning unit is located on the support seat.

[0017] Preferably, the fixing unit includes a first outer shell disposed on the workbench, the first outer shell is provided with a primary roll, the primary roll is provided with two secondary rolls, the two secondary rolls are tangent to the primary roll in pairs, and a tertiary roll is provided above the tangent points of the two secondary rolls, the tertiary roll is tangent to the two secondary rolls respectively; the outer diameters of the primary roll, secondary roll and tertiary roll decrease sequentially.

[0018] Preferably, the pressurizing unit includes a second housing, the top center of the second housing abuts against the output end of the pressurizing mechanism, a limiting mechanism is provided between the second housing and the back plate, and the sensing unit includes a pressure sensor that cooperates with the pressurizing mechanism;

[0019] The second outer shell is provided with one primary pressure roller, and two secondary pressure rollers are provided below the primary pressure roller. The two secondary pressure rollers are configured to cooperate with the support unit. The outer diameter of the primary pressure roller is larger than the outer diameter of the secondary pressure roller. The secondary pressure rollers that cooperate with the metal ring are provided with clearance positions.

[0020] Preferably, the back plate is provided with a top plate, and the pressure mechanism is located at the bottom of the top plate;

[0021] The limiting mechanism includes at least two limiting posts located at the bottom of the top plate, each limiting post being vertically arranged and cooperating with the second outer shell, and each limiting post having a limiting block at its bottom.

[0022] The limiting mechanism also includes two side wings located on both sides of the second housing. The side wings are flush with the side of the second housing facing the back plate, and guide members are provided on the back plate that cooperates with the two side wings.

[0023] Preferably, the support unit includes a movable roller that runs through the back plate, and the movable roller is disposed between the pressurizing unit and the fixed unit; the drive unit includes a lifting cylinder disposed on the worktable on the back side of the back plate, the output end of the lifting cylinder is provided with a platform, the platform is provided with a rotating motor, the output end of the rotating motor is provided with a drive gear, the drive gear meshes with a driven gear, and the driven gear is fixedly sleeved on the outside of the movable roller.

[0024] Preferably, a limiting slider is also sleeved on the movable roller, and a sliding hole is provided on the back plate of the limiting slider.

[0025] Preferably, the tensioning unit includes a mounting frame on a support base, and a fixed pulley is provided on the mounting frame that cooperates with the movable roller; the driving unit includes a tension cylinder that cooperates with the mounting frame, and the output end of the tension cylinder cooperates with the mounting frame; a sliding groove is provided on the support base that cooperates with the mounting frame; the sensing unit includes a tension sensor that cooperates with the output end of the tension cylinder and the mounting frame, and also includes a displacement sensor that cooperates with the mounting frame and the back plate.

[0026] Preferably, the sensing unit further includes a thickness sensor disposed on the back plate, the thickness sensor being configured in conjunction with a metal ring.

[0027] Preferably, all rollers that mate with the metal ring are sequentially coated with a CrAlN or CrAlCN coating, and a transition layer is provided between the CrAlN or CrAlCN coating and the rollers.

[0028] This invention relates to a precision rolling apparatus for thin-walled metal rings, comprising a base, a fixing unit, a pressurizing unit, a supporting unit, and a tensioning unit that are fitted to the base. The fixing unit provides bottom fixation for the rolling position of the metal ring, the pressurizing unit provides top pressure for the rolling position of the metal ring, the supporting unit cooperates with the fixing unit and the pressurizing unit and is located outside the metal ring to provide support for the rolling of the metal ring, and the tensioning unit cooperates with the supporting unit and is located outside the metal ring to provide tension force for the rolling of the metal ring. A driving unit is provided in conjunction with the supporting unit and the tensioning unit, and a sensing unit is provided in conjunction with the pressurizing unit, the metal ring, and the tensioning unit.

[0029] The beneficial effects of this invention are as follows:

[0030] (1) By reasonably increasing the number of rollers and reasonably arranging the relative positions of each roller, unnecessary movement of the moving rollers is restricted, and rolling accuracy is improved. The rolling accuracy of the metal ring in thickness can reach 0.0001mm, and the rolling accuracy in circumference can reach 0.0002mm, which can meet the manufacturing process requirements of the metal ring.

[0031] (2) The movable roll is designed as a cantilever and equipped with a drive unit to control the contact and separation of the movable roll with the pressure unit and the fixed unit. The movable roll is confined inside the triangular area enclosed by the pressure unit and the fixed unit. It will not bend during the rolling and stretching process, thereby further improving the accuracy and preventing uneven thickness of the two end faces of the metal ring after rolling.

[0032] (3) The equipment adopts a vertical layout, which greatly simplifies the rolling operation steps and improves rolling efficiency;

[0033] (4) Each roller is coated with a hard coating to improve wear resistance, thereby extending the service life of the high-precision rolling equipment and reducing the maintenance cost of the equipment. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0035] Figure 2 This is a schematic diagram of the main view structure of the present invention;

[0036] Figure 3 for Figure 2 A schematic diagram of the structure in sectional view along the AA direction;

[0037] Figure 4 for Figure 2 Schematic diagram of the BB-direction cross-section structure;

[0038] Figure 5 This is a side view structural diagram of the present invention;

[0039] Figure 6 for Figure 5 A schematic diagram of the structure in the CC direction section;

[0040] Figure 7 This is a schematic diagram of the structure of the secondary pressure roller of the present invention;

[0041] Figure 8 This is a schematic diagram and cross-sectional SEM image of the preparation of the hard coating on the roller surface of the present invention. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to embodiments, but the scope of protection of the present invention is not limited thereto.

[0043] This invention relates to a precision rolling mill for thin-walled metal rings, the mill including a base, and the base being equipped with:

[0044] A fixing unit is used to fix the bottom of the rolling position of the metal ring 1;

[0045] A pressurizing unit is used to provide top pressure to the rolling position of the metal ring 1;

[0046] A support unit, in conjunction with a fixing unit, a pressurizing unit and a metal ring 1, is provided to support the rolling of the metal ring 1;

[0047] A tensioning unit, which is configured in conjunction with the support unit and located outside the metal ring 1, is used to provide tension force for the rolling of the metal ring 1;

[0048] A drive unit is provided to complement the support unit and the tensioning unit respectively;

[0049] Sensing units are provided in conjunction with the pressurization unit, the metal ring 1, and the tensioning unit.

[0050] The base includes a horizontally arranged workbench 2, on which a mounting backplate 3 is provided. The fixing unit is located on the workbench 2 at one end of the backplate 3. The pressurizing unit is located directly above the fixing unit and is configured to cooperate with the backplate 3. A support seat 4 is provided on the workbench 2 at the other end of the backplate 3. The support seat 4 and the fixing unit are located on the same side of the backplate 3. The tensioning unit is located on the support seat 4.

[0051] In this invention, the entire equipment is mounted on a base. Specifically, the base includes a horizontally positioned workbench 2 for supporting all working units. A back plate 3 is mounted on the workbench 2. A fixing unit and a pressurizing unit are mounted on one end of the front of the back plate 3, and a tensioning unit is mounted on the other end. The back plate 3 is used to confirm the relative positions of the fixing unit and the pressurizing unit. A power component for the supporting unit is mounted on the back of the back plate 3. A movable roller 5 extends from the back of the back plate 3 through the back plate 3 to the front of the back plate 3 and cooperates with the fixing unit and the pressurizing unit. That is, the base is used to limit the position between units while facilitating the setup, ensuring the accuracy of rolling.

[0052] In this invention, the base should be provided with necessary shock absorption measures to ensure that the equipment is not disturbed by external factors during the rolling process, thereby ensuring rolling accuracy. In addition, if necessary, the rolls should be cooled to reduce the heat generated by the deformation of the metal ring 1 during the rolling process and its impact on rolling accuracy.

[0053] In this invention, both the fixing unit and the pressurizing unit process the rolling position of the metal ring 1, which is the position of the movable roller 5 of the support unit.

[0054] In this invention, it is obvious that a controller is provided in conjunction with the drive unit and the sensing unit. During the rolling process, the controller controls the operation of the drive unit according to preset rules, and at the same time receives the sensing signals from the sensing unit in real time and gives new feedback signals to the drive unit, including but not limited to the starting, stopping, contacting and separating of the rolls. The configuration of the controller here is easy for those skilled in the art to understand, and those skilled in the art can set it themselves according to their needs.

[0055] In this invention, it should be specifically noted that the thin-walled metal ring is the metal ring 1, and the thin-walled metal ring is the final form of the metal ring 1.

[0056] The fixed unit includes a first outer shell 6 disposed on the workbench. The first outer shell 6 is provided with a primary roll 7. The primary roll 7 is provided with two secondary rolls 8. The two secondary rolls 8 are tangent to the primary roll 7 in pairs. Above the tangent points of the two secondary rolls 8 is a tertiary roll 9. The tertiary roll 9 is tangent to the two secondary rolls 8 respectively. The outer diameters of the primary roll 7, the secondary rolls 8 and the tertiary roll 9 decrease sequentially.

[0057] In this invention, the fixed unit limits the position of the movable roll 5 and the metal ring 1 outside it. Its displacement in the horizontal and vertical directions is basically 0, which means it is a fixed roll group. The first-stage roll 7, the second-stage roll 8 and the third-stage roll 9 are connected to the first housing 6 through bearings. If necessary, a roll support can be configured in the first housing 6 to ensure its load-bearing capacity. The first-stage roll 7 and the second-stage roll 8, and the second-stage roll 8 and the third-stage roll 9 are tangent, or more precisely, in line contact, which can achieve contact rolling.

[0058] In this invention, the outer diameters of the first-stage roll 7, the second-stage roll 8, and the third-stage roll 9 decrease sequentially to ensure a greater reduction under a smaller rolling force. Furthermore, the reduction in rolling force can be achieved by reducing the elastic deformation of the rolls, thereby improving rolling accuracy.

[0059] The pressurizing unit includes a second housing 10, the top center of the second housing 10 abuts against the output end of the pressurizing mechanism, a limiting mechanism is provided between the second housing 10 and the back plate 3, and the sensing unit includes a pressure sensor 11 that is configured to cooperate with the pressurizing mechanism.

[0060] The second outer casing 10 is provided with one primary pressure roller 12, and two secondary pressure rollers 13 are provided below the primary pressure roller 12. The two secondary pressure rollers 13 are configured to cooperate with the support unit. The outer diameter of the primary pressure roller 12 is larger than the outer diameter of the secondary pressure rollers 13. The secondary pressure rollers 13 that cooperate with the metal ring 1 are provided with a clearance position 14.

[0061] The back plate 3 is provided with a top plate 15, and the pressure mechanism is located at the bottom of the top plate 15;

[0062] The limiting mechanism includes at least two limiting posts 16 located at the bottom of the top plate 15. Each limiting post 16 is vertically arranged and cooperates with the second outer shell 10. Each limiting post 16 has a limiting block 17 at its bottom.

[0063] The limiting mechanism also includes two side wings 18 on both sides of the second outer shell 10. The side wings 18 are flush with the side of the second outer shell 10 facing the back plate 3. The back plate 3, which cooperates with the two side wings 18, is provided with guide members 19.

[0064] In this invention, the pressurizing unit applies downward pressure to the movable roller 5 and the metal ring 1 outside it, so its displacement in the horizontal direction is basically 0, but its displacement in the vertical direction is necessarily not 0; the primary pressure roller 12 and the secondary pressure roller 13 are connected to the second housing 10 through bearings. If necessary, a pressure roller support can be configured in the second housing 10 to ensure its load-bearing capacity. The primary pressure roller 12 and the secondary pressure roller 13 are tangent, or more precisely, in line contact, which can achieve contact rolling.

[0065] In this invention, since the secondary pressure roller 13 will directly act on the movable roller 5 and there is pressure contact, a clearance position 14 is provided on the secondary pressure roller 13. This clearance position 14 corresponds to the position of the metal ring 1 during the rolling process, and its width matches that of the metal ring 1, so that the secondary pressure roller 13 only contacts the movable roller 5 and does not contact the metal ring 1. This reduces the influence of the secondary pressure roller 13 on the accuracy of the metal ring 1, avoids its deformation, and can limit the back-and-forth swing of the metal ring 1 during the rolling process.

[0066] In this invention, the pressurizing mechanism can be set independently or integrated with the equipment. Here, an embodiment integrating with the equipment is proposed. Based on this embodiment, a top plate 15 is set on the top of the back plate 3. In addition to facilitating the setting of the pressurizing mechanism, a limiting mechanism can also be set there. In this embodiment, the pressurizing mechanism includes a hydraulic system 20 and a stop block 21 welded to the bottom of the hydraulic rod of the hydraulic system 20. It is used to lift and lower the pressure unit and provide the pressure required for rolling the metal ring 1. During the rolling of the metal ring 1, the pressure applied to the metal ring 1 by the pressurizing mechanism is transmitted to the controller through the pressure sensor 11, and then fed back to the pressurizing mechanism to increase, decrease or maintain the pressure, and to compensate for the weight of the pressure roller group itself and the friction associated with it. Through this bidirectional adjustment mechanism, the effect of precision rolling of the metal ring 1 is achieved.

[0067] In this invention, since the pressure unit involves pressing down, it is necessary to ensure that it always moves within a preset range in the vertical direction. Therefore, a limiting mechanism is required for it. The limiting mechanism includes limiting the pressure unit to always move in the vertical direction and backing against the back plate 3 to prevent shaking.

[0068] In this invention, to ensure that the pressure unit always moves in the vertical direction, at least two limiting posts 16, typically four, are fixed to the bottom of the top plate 15, corresponding to the four corners of the second outer shell 10 in the horizontal direction, to guide the second outer shell 10 to move in the vertical direction. In principle, the limiting posts 16 should penetrate the second outer shell 10. Of course, in some scenarios, it is also possible to choose to penetrate only the top wall of the second outer shell 10. Furthermore, a limiting block 17 is set at the bottom of the limiting post 16 to ensure that the pressure unit will not fall accidentally when the equipment malfunctions during operation, thereby avoiding unnecessary damage to the metal ring 1 rolling equipment.

[0069] In this invention, to limit the pressure unit to rest against the back plate 3 and prevent vibration, side wings 18 are provided on both sides of the second outer shell 10 on the side of the back plate 3, and guide members 19 are provided on the back plate 3. In fact, the side wings 18 are used as sliders and the guide members 19 are used as slide rails to realize the reciprocating motion of the second outer shell 10 in a straight line, thereby limiting the pressure unit from tilting in the front and back direction and ensuring that its back is in close contact with the back plate 3.

[0070] The support unit includes a movable roller 5 that runs through the back plate 3. The movable roller 5 is configured between the pressurizing unit and the fixed unit. The drive unit includes a lifting cylinder 22 on the worktable 2 on the back side of the back plate 3. The output end of the lifting cylinder 22 is provided with a platform 23. The platform 23 is provided with a rotating motor 24. The output end of the rotating motor 24 is provided with a drive gear 25. The drive gear 25 meshes with a driven gear 26. The driven gear 26 is fixedly sleeved on the outside of the movable roller 5.

[0071] The movable roller 5 is also fitted with a limiting slider 27, and the back plate 3 fitted with the limiting slider 27 has a sliding hole 28.

[0072] In this invention, since the metal ring 1 needs to be fitted onto or removed from the outside of the movable roller 5 before and after processing, the movable roller 5 needs to be able to move up and down and have a gap between it and the pressure unit and the fixing unit (for fitting or removing the metal ring 1). During processing, the rotation of the movable roller 5 is needed to drive the rotation of the metal ring 1, so the movable roller 5 needs to have the ability to rotate around an axis. Based on this, a drive unit is set to cooperate with the movable roller 5. The lifting cylinder 22 on the worktable 2 on the back side of the back plate 3 realizes the lifting and lowering of the upper platform 23, that is, the lifting and lowering of the movable roller 5. A rotating motor 24 is set on the platform 23. The output end of the rotating motor 24 faces the back plate 3. The driving gear 25 drives the driven gear 26 in sequence, thereby driving the movable roller 5 fixedly fitted inside to rotate. The driving gear 25 and the driven gear 26 exist as a transmission gear set. In actual applications, the transmission gear set includes, but is not limited to, two gears.

[0073] In this invention, the rotating motor 24 can be a variable frequency speed-regulating three-phase asynchronous motor such as YVF2-132S1-4 5.5KW. Obviously, the output end of this rotating motor 24 is equipped with a frequency converter to meet the speed regulation, which is easy for those skilled in the art to understand.

[0074] In this invention, in order to ensure that the horizontal direction of the movable roller 5 does not deviate, a limiting slider 27 is provided outside it, and a sliding hole 28 is provided on the back plate 3. Based on this, the limiting slider 27 can only move up and down in the sliding hole 28 of the back plate 3. At the same time, it is obvious that there is relative movement between the limiting slider 27 and the movable roller 5, that is, it does not affect the rotation of the movable roller 5 around the axis.

[0075] The tensioning unit includes a mounting frame 29 mounted on a support base 4, and a fixed pulley 30 is provided on the mounting frame 29 to cooperate with the movable roller 5; the drive unit includes a tension cylinder 31 that cooperates with the mounting frame 29, and the output end of the tension cylinder 31 cooperates with the mounting frame 29; the support base 4 that cooperates with the mounting frame 29 is provided with a sliding groove 32; the sensing unit includes a tension sensor 33 that cooperates between the output end of the tension cylinder 31 and the mounting frame 29, and also includes a displacement sensor that cooperates between the mounting frame 29 and the back plate 3.

[0076] In this invention, the tensioning unit is used to tension the metal ring 1 during processing. It provides tension force throughout the rolling process, keeping the ring under tension. The mounting frame 29 is placed in the groove 32 of the support base 4 and is driven by the tension cylinder 31 to achieve sliding and tensioning. At the same time, a fixed pulley 30 is set on the mounting frame 29. Obviously, this fixed pulley 30 cooperates with the movable roll 5 to keep the metal ring 1 horizontal during processing. The width of the groove of the fixed pulley 30 matches the width of the metal ring 1, which restricts the swing of the metal ring 1 during the rolling process and ensures rolling accuracy. In actual operation, the fixed pulley 30 can be driven by the metal ring 1 to rotate around its central axis, reducing wear on the metal ring 1.

[0077] In this invention, a tension sensor 33 is provided on the mounting frame 29. The two ends of the tension sensor 33 act on the mounting frame 29 and the output end of the tension cylinder 31, respectively, to detect and provide feedback on the tension applied to the mounting frame 29 by the tension cylinder 31.

[0078] In this invention, a displacement sensor is configured between the mounting frame 29 and the back plate 3. Generally, the displacement sensor includes a signal transmitter 341 and a signal receiver 342. The signal transmitter 341 and the signal receiver 342 are respectively disposed on the mounting frame 29 and the back plate 3, with the two facing each other and the center line connecting them perpendicular to the stretching direction of the metal ring 1. During the rolling process, the displacement sensor monitors the displacement distance of the mounting frame 29 in real time, and the real-time length of the metal ring 1 can be calculated based on the displacement distance.

[0079] The sensing unit also includes a thickness sensor 35 disposed on the back plate 3, which is configured in conjunction with the metal ring 1.

[0080] In this invention, in addition to the aforementioned sensors, a thickness sensor 35 is also provided on the back plate 3. In order to better understand the rolling process, there are generally two thickness sensors 35, which are respectively matched with the upper and lower sections of the horizontal segment of the metal ring 1, and the two thickness sensors 35 are misaligned to accurately measure the real-time thickness of the metal ring 1.

[0081] All rollers that mate with the metal ring are sequentially coated with CrAlN or CrAlCN coatings, and a transition layer is provided between the CrAlN or CrAlCN coatings and the rollers.

[0082] In this invention, a hard coating is applied to each roll 5, 7, 8, 9, 12, 13 using physical vapor deposition (PVD) technology. This hard coating enhances the wear resistance of each roll 5, 7, 8, 9, 12, 13, further improving their service life and reducing the maintenance cost of the rolling equipment. Generally, the coating is CrAlN or CrAlCN. In the actual processing, a transition layer exists between the coating and the rolls 5, 7, 8, 9, 12, 13. This transition layer can improve the adhesion and prevent the coating from peeling off.

[0083] In this invention, under certain circumstances, this coating can also be applied to the fixed pulley 30.

[0084] In this invention, the preparation process of the CrAlN or CrAlCN coating includes the following steps, whereby rollers 5, 7, 8, 9, 12, and 13 are collectively referred to as rollers:

[0085] Step 1: Roller cleaning; The machined rollers (including movable roller 5, primary roller 7, secondary roller 8, tertiary roller 9, primary pressure roller 12 and secondary pressure roller 13) are mechanically ground and polished. The polished rollers are then ultrasonically cleaned in an alcohol-acetone solution for 15-30 minutes to remove surface impurities and oil stains, and then dried for later use.

[0086] Step 2: Coating preparation; Place the roller processed in Step 1 onto the sample rack in the PVD coating equipment chamber, and start the equipment vacuum system to evacuate the chamber to a vacuum state;

[0087] Step 3: Clean the chamber; wait until the chamber vacuum reaches 2.5 × 10⁻⁶. -5 During the torr process, 10~30 sccm of high-purity argon gas (≥99.999%) is introduced into the chamber as a protective gas. A -500V bias voltage is used to perform plasma cleaning on the chamber and roller surface. During the cleaning process, a small current, such as 0.5~1.0A, is applied to the metal target to avoid contamination.

[0088] Step 4: Deposit transition layer; To improve the adhesion between the coating and the roller, a transition layer is deposited on the surface of the roller. The bias voltage is adjusted to -80~-120V, the Cr target current is increased to 4~8A, and high-purity nitrogen gas (≥99.999%) at a constant flow rate is introduced into the chamber. The flow rate of high-purity nitrogen gas is set to 10~20sccm. In the chamber, active Cr atoms and active N atoms combine to form CrN, which is deposited on the roller surface. After 10~20min, the CrN transition layer deposition is completed.

[0089] Step 5: Deposit the final layer; After the transition layer is deposited, keep the Cr target current and nitrogen flow rate constant, turn on the Al target to deposit the CrAlN final layer on the CrN transition layer, or simultaneously turn on the Al target and high-purity acetylene gas (C2H2≥99.9%) to deposit the CrAlCN final layer on the CrN transition layer. The Al target current is set to 4~8A, the C2H2 flow rate is set to 10~30sccm, and the final layer deposition time is preferably 30~90min.

[0090] In this invention, the hardness and wear resistance of the treated roller surface are improved, and the service life of the roller can be increased by more than 100%.

[0091] The working principle of this invention is that a controller, generally a computer intelligent control system, controls the rolling equipment, including but not limited to issuing commands and providing feedback. The rolling equipment can be automatically controlled according to a set program. This is something that those skilled in the art can easily understand. Those skilled in the art can set the controller according to the operating principle of the equipment.

[0092] The complete rolling process is divided into the roll contact process, the formal rolling process, and the roll separation process.

[0093] During the contact process of the rolls, the rolling equipment is initialized, the initial position and coordinates of each unit are confirmed, and the position is adjusted to the accurate position. The metal ring 1 to be rolled is placed on the corresponding part of the fixed pulley 30 and the movable roll 5. The metal ring 1 is in a relaxed state. The tensioning unit works to put the metal ring 1 in a tensioned state. The movable roll 5 descends, so that the metal ring 1 placed on it contacts the top of the fixed unit. The pressurizing unit is started to press down, and its bottom contacts the metal ring 1 outside the movable roll 5.

[0094] During the formal rolling process, the rotation speed of the movable roll 5 is set and it begins to rotate at a constant speed. Driven by the movable roll 5, the corresponding roller shafts of the fixed unit and the pressure unit begin to rotate, and the fixed pulley 30 rotates. The downward pressure of the pressure unit is set according to the rolling process requirements, and the pressure mechanism is started. During the rolling process, the displacement sensor monitors the displacement distance of the mounting frame in real time and calculates the real-time length of the metal ring 1. During the rolling process, the thickness sensor 35 measures the thickness of the metal ring 1 in real time. When the thickness of the metal ring 1 meets the error requirements, it is judged whether the length of the metal ring 1 meets the error requirements. If both the thickness and length of the metal ring 1 meet the error requirements, the process directly jumps to the roll separation process. If either of them does not meet the error requirements, the pressure of the pressure mechanism is reset. At this time, the error amount and error range of the thickness and length of the metal ring 1 need to be considered comprehensively.

[0095] The pressurization process of the pressurizing mechanism is fed back in real time by the pressure sensor 11; if the size of the metal ring 1 still does not meet the technical requirements after a preset number of pressure adjustments, such as 5 times, the rolling process ends and an error report is sent to the user, and the process jumps to the roll separation process.

[0096] Roll separation process: The pressurizing unit unloads the pressure, the movable roll 5 stops rotating, the pressurizing unit separates from the movable roll 5, the movable roll 5 separates from the fixed unit, the tensioning unit returns, and the rolled metal ring 1 is taken out;

[0097] Once a complete rolling process is complete, a new metal ring 1 can be replaced to continue rolling.

Claims

1. A thin-walled metal ring precision rolling apparatus, characterized by: The device includes a base, the base includes a horizontally arranged workbench, the workbench is provided with a mounting backplate, and the following are provided in conjunction with the base: A fixing unit is used to fix the bottom of the rolling position of the metal ring; A pressurizing unit is used to provide top pressure to the rolling position of a metal ring; the pressurizing unit includes a second housing, inside which is provided a primary pressure roller, and below the primary pressure roller are two secondary pressure rollers, which are configured to cooperate with a support unit. The outer diameter of the primary pressure roller is larger than the outer diameter of the secondary pressure rollers, and the secondary pressure rollers that cooperate with the metal ring are provided with clearance positions; a limiting mechanism is provided between the second housing and the back plate, including two side wings on both sides of the second housing, the side wings being flush with the side of the second housing facing the back plate, and a guide member being provided on the back plate that cooperates with the two side wings; A support unit, in conjunction with a fixing unit, a pressurizing unit, and a metal ring, is used to provide support for the rolling of the metal ring; the support unit includes a movable roller that passes through a back plate, and the movable roller is positioned between the pressurizing unit and the fixing unit; a limiting slider is also sleeved on the movable roller, and a sliding hole is provided on the back plate that cooperates with the limiting slider; A tensioning unit, which is configured in conjunction with the support unit and located outside the metal ring, is used to provide tension force for the rolling of the metal ring; A drive unit is provided to complement the support unit and the tensioning unit respectively; Sensing units are provided in conjunction with the pressurization unit, the metal ring, and the tensioning unit; All rollers that mate with the metal ring are sequentially coated with CrAlN or CrAlCN coatings.

2. A thin-walled metal ring precision rolling apparatus according to claim 1, characterized in that: The fixing unit is located on the worktable at one end of the back plate, the pressurizing unit is located directly above the fixing unit and is configured to cooperate with the back plate, and a support seat is provided on the worktable at the other end of the back plate. The support seat and the fixing unit are located on the same side of the back plate, and the tensioning unit is located on the support seat.

3. A thin-wall metal ring precision rolling apparatus according to claim 2, characterized in that: The fixed unit includes a first outer shell mounted on a workbench. Inside the first outer shell is a primary roll, and on the primary roll are two secondary rolls. The two secondary rolls are tangent to the primary roll in pairs. Above the tangent points of the two secondary rolls is a tertiary roll, which is tangent to the two secondary rolls respectively. The outer diameters of the primary roll, secondary roll, and tertiary roll decrease sequentially.

4. A thin-wall metal ring precision rolling apparatus according to claim 2, characterized in that: The output end of the pressurizing mechanism is located at the top center of the second housing, and the sensing unit includes a pressure sensor that is configured to cooperate with the pressurizing mechanism.

5. A thin-wall metal ring precision rolling apparatus according to claim 4, characterized in that: The back plate is provided with a top plate, and the pressure mechanism is located at the bottom of the top plate; The limiting mechanism includes at least two limiting posts located at the bottom of the top plate. Each limiting post is vertically arranged and cooperates with the second outer shell. Each limiting post has a limiting block at its bottom.

6. A thin-wall metal ring precision rolling apparatus according to claim 2, characterized in that: The drive unit includes a lifting cylinder on a workbench on the back side of the back plate. The output end of the lifting cylinder is provided with a platform. A rotating motor is provided on the platform. The output end of the rotating motor is provided with a drive gear. The drive gear meshes with a driven gear. The driven gear is fixedly sleeved on the outside of the movable roller.

7. A thin-wall metal ring precision rolling apparatus according to claim 6, characterized in that: The tensioning unit includes a mounting frame mounted on a support base, and a fixed pulley is provided on the mounting frame that cooperates with the movable roller; the drive unit includes a tension cylinder that cooperates with the mounting frame, and the output end of the tension cylinder cooperates with the mounting frame; a sliding groove is provided on the support base that cooperates with the mounting frame; the sensing unit includes a tension sensor that cooperates with the output end of the tension cylinder and the mounting frame, and also includes a displacement sensor that cooperates with the mounting frame and the back plate.

8. A thin-wall metal ring precision rolling apparatus according to claim 2, characterized in that: The sensing unit also includes a thickness sensor mounted on the back plate, which is configured in conjunction with a metal ring.

9. A precision rolling mill for thin-walled metal rings according to claim 3, 4, or 6, characterized in that: A transition layer is provided between the CrAlN or CrAlCN coating and the roller.

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