Online processing method for adaptive reconstruction of a new type of bending and shifting roller device for hot rolling

Abstract

The application discloses a rack online processing method for adaptive reconstruction of a hot rolling new type bending and shifting roller device, a rigid platform is built at a rack window for construction, a mobile boring and milling machine is used for adaptive reconstruction of the rack, the position of the machine is finely adjusted to ensure accuracy after the machine is positioned, high-precision tooling templates for processing and related equipment for rack reconstruction are provided, a processing reference is determined according to original state detection data, the rack is processed and reconstructed by taking the rack window surface position of the installation of the balancing bending roller cylinder as the processing reference, and the balancing bending roller cylinder installation surface, inner and outer upper and lower stop ports, the newly-added outer installation surface of the rack transmission side, the balancing key groove, screw holes and the like are processed; after the machine is processed, the processing accuracy is detected by using a level and a laser tracker, and the installation accuracy requirement of the hot rolling new type bending and shifting roller device is met. The method ensures high-precision implementation of the processing operation, improves the processing operation efficiency, saves the equipment reconstruction cost, and further improves the stability and accuracy of rolling of the rolling mill.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical equipment modification, and particularly relates to a rack online processing method for adaptive modification of a new type of hot rolling bending and shifting roller device. BACKGROUND

[0002] At present, the market has increasingly high requirements for the shape accuracy of hot continuous rolling strip and plate products, and the bending and shifting roller and transverse shifting device of the work roll of the rolling mill becomes the first choice and the best solution for solving the shape problem of each enterprise. The bending and shifting roller and transverse shifting device is the core part of the hot continuous rolling mill, and the work roll bending and shifting roller and the work roll transverse shifting device are mostly used to control and improve the shape in the hot rolling production line, especially in the finishing mill group of the hot continuous rolling production line. At present, the work roll bending and shifting roller and the transverse shifting device are basically configured, and the effect of the device in controlling the shape has been verified in the production practice of the steel plants at home and abroad. As one of the core components of the four-high hot rolling mill, the rationality of the structure of the work roll bending and shifting roller and the transverse shifting device has important influence on the production rhythm, equipment maintenance and product quality. At present, the fixed block and moving block structure is mostly used in the bending and shifting roller device of the finishing mill, and the use of the structure causes the following problems: the sliding fit surfaces of the device are many, the gap is difficult to eliminate after wear, the precision deviation of the bending and shifting roller is large, the rolling process is unstable, zero point drift and other problems occur, the shape control is seriously affected, the shape is poor, and the influence is more obvious when thin specifications are rolled. In addition, the device has many roll changing blind spots, the personnel need to confirm on site, the automatic roll changing is affected, the roll changing time is lengthened, and the output of the hot rolling production line is affected. Furthermore, the structure of the device is complex, the quantity of spare parts is large, and the subsequent maintenance cost is high.

[0003] In view of the above reasons, some domestic steel plants begin to introduce a new type of fixed bending and shifting roller device. The new type of fixed bending and shifting roller device adopts a fixed bending roller and a transverse shifting device, is equipped with an independent balance bending roller cylinder, and is composed of four steel blocks, namely the operation side inlet and outlet bending roller block and the transmission side inlet and outlet bending roller block. The main advantages of the structure of the new type of fixed block bending and shifting roller are as follows: simple structure, few fit surfaces; good overall stability, few spare parts; long service life, low subsequent maintenance cost; automatic roll changing can be realized, and the roll changing window time is reduced. The introduction of the new type of fixed bending and shifting roller device solves a series of disadvantages of the traditional bending and shifting roller device, but the new type of fixed bending and shifting roller device is not matched with the structure of the original rolling mill rack, thereby adaptive modification of the rolling mill rack is involved, so that the modified rack frame can meet the installation requirements of the new type of fixed bending and shifting roller device and meet a series of subsequent production processes of the hot rolling production line.

[0004] The upgrade and transformation of the bending roll device has put forward corresponding requirements on the structure of the hot strip mill stand. The mill stand structure needs to be adapted to the new bending roll device. Therefore, the mill stand needs to be processed and modified online to meet the subsequent installation requirements. Specifically, the bending roll cylinder surface and new parts related to the new structure of the stand need to be processed and modified, including the bending roll cylinder surface on the operating side and drive side of the stand, the inner and outer stops and the upper and lower stops, the new mounting surface on the outer side of the drive side of the stand, the transverse keyway and screw holes, etc. Traditional machining methods cannot realize the online processing of the mill stand. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an online processing method for the stand of a hot rolling mill to adapt to the installation requirements of the new bending roll device. This method enables the processed mill stand to adapt to the installation requirements of the new bending roll device, ensures high precision of processing operations, improves processing efficiency, saves equipment modification costs, and thus improves the stability and precision of mill rolling.

[0006] To solve the above-mentioned technical problems, the present invention provides an online processing method for the stand of a hot rolling mill for adaptive modification of a new type of bending and shifting roll device, comprising the following steps:

[0007] Step 1: Construct a rigid construction platform. Based on the lower support roller changing track, hoist the rigid platform for processing onto the changing track. Use the lower support roller changing trolley, changing guide rail, and hydraulic cylinder to push the rigid platform into the frame window and fix it in place by welding.

[0008] Step 2: Inspect the frame window size tolerance, rigid platform positioning height, and the verticality and parallelism errors of the frame windows on the transmission and operation sides. Record the measurement results and determine the process reference for the mounting surface of the balance bending roller cylinder and the transverse keyway based on the measurement results.

[0009] Step 3: Position and adjust the mobile CNC boring and milling machine. Hoist the mobile CNC boring and milling machine onto the rigid platform. The X-axis horizontal guide rail of the machine is set on the rigid platform, and the Y-axis vertical column for installing the bidirectional boring and milling head is set on the X-axis horizontal guide rail. Adjust the levelness of the X-axis horizontal guide rail and the verticality of the Y-axis vertical column, and adjust the straightness of the frame window.

[0010] Step 4: After the machine tool is positioned and adjusted, the mounting surface of the balance bending roller cylinder on the transmission side of the machine frame, as well as the upper and lower and inner and outer positioning stops, are machined in sequence. The machining datum is divided from the center of the original bolt hole, and the tolerance meets the installation requirements of the balance bending roller cylinder. According to the actual situation of the machine frame, new bolt holes are added or existing bolt holes are reused.

[0011] Step five, the transmission side of the rack is modified, the newly added outer side mounting surface, the transverse key groove and screw hole located at the balance bending roller cylinder mounting surface and the newly added outer side mounting surface are machined, after the outer side mounting surface is machined, the transverse key groove and screw hole are machined by using the high-precision tooling template prepared in advance, the tooling template is welded and fixed after the in-place adjustment is completed, then the transverse key groove is machined by using the machine tool, and the screw hole is machined by using the magnetic seat drill;

[0012] Step six, the machine tool is adjusted to process the direction, the balance bending roller cylinder mounting surface of the operating side of the rack and the up-down and left-right positioning stop are sequentially machined, the machining reference is divided from the center of the original design screw hole, the tolerance reaches the balance bending roller cylinder mounting requirement, according to the actual situation of the rack, the screw hole is newly added or used;

[0013] Step seven, the rack transmission side and operating side machining size are detected by using the level and laser tracker, and the installation precision requirement of the hot rolling new type bending and rolling device is met.

[0014] Further, the rigid platform in step one comprises an upper platform and a lower platform arranged in an up-down interval, and an equal-height support frame is arranged between the upper platform and the lower platform.

[0015] Further, the rigid platform in step one is laid with a pattern plate at the gap of the rack and welded and fixed, and a fence is welded at the edge of the rigid platform.

[0016] Further, the horizontal degree of the X-direction horizontal guide rail and the vertical degree of the Y-direction vertical column in step three are respectively ≤0.05mm / m, and are tested by using the vertical instrument and the level.

[0017] Since the rack online machining method for the adaptive modification of the hot rolling new type bending and rolling device adopts the above technical scheme, that is, the method builds a rigid platform at the rack window, a mobile boring and milling machine tool is used to adaptively modify the rack, the position is finely adjusted after the machine tool is in place to ensure the accuracy, the high-precision tooling template for machining and the related equipment for the modification of the rack are prepared, the machining reference is determined according to the original state detection data, the rack is modified by taking the rack window surface position of the balance bending roller cylinder installation as the machining reference, the balance bending roller cylinder mounting surface, the inner and outer up-down stop, the newly added outer side mounting surface of the rack transmission side, the balance key groove and the screw hole are machined; after the machine tool machining is completed, the machining accuracy is detected by using the level and the laser tracker, and the installation precision requirement of the hot rolling new type bending and rolling device is met. The method makes the machined rolling mill rack adapt to the installation requirement of the new type bending roller device, ensures the high-precision implementation of the machining operation, improves the machining operation efficiency, saves the equipment modification cost, and further improves the stability and precision of the rolling mill rolling. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application will be further described in detail below in combination with the drawings and embodiments:

[0019] Figure 1 The figure shows the online processing method of the rack in the construction of the rigid platform and the positioning of the machine tool;

[0020] Figure 2 The figure shows the online processing method of the rack in the construction of the rigid platform and the positioning of the machine tool;

[0021] Figure 3 The figure shows the online processing method of the rack in the construction of the rigid platform and the positioning of the machine tool;

[0022] Figure 4 The figure shows the online processing method of the rack in the construction of the rigid platform and the positioning of the machine tool. DETAILED DESCRIPTION

[0023] The embodiment as shown, the online processing method of the rack in the construction of the rigid platform and the positioning of the machine tool includes the following steps: Figures 1 to 4 The figure shows the online processing method of the rack in the construction of the rigid platform and the positioning of the machine tool.

[0024] Step one, build a construction rigid platform 2, based on the lower supporting roller changing roller track, hoist the rigid platform 1 used for processing to the changing roller track, use the lower supporting roller changing roller trolley, changing roller guide rail and oil cylinder to push the rigid platform into the rack 1 window and weld and fix it in place;

[0025] Step two, detect the rack 1 window size tolerance, the rigid platform 2 positioning height size, and the rack 1 transmission side and operation side rack window perpendicularity and parallelism error, record the measurement results, and determine the process reference of the balance bending roller cylinder mounting surface and the transverse keyway processing according to the measurement results;

[0026] Step three, move the numerical control boring and milling machine tool 3 to the position and adjust it, hoist the numerical control boring and milling machine tool 3 to the rigid platform 2, the X-direction horizontal guide rail 31 of the machine tool 3 is arranged on the rigid platform, the Y-direction vertical column 32 of the double-direction boring and milling head 33 is arranged on the X-direction horizontal guide rail 31, adjust the levelness of the X-direction horizontal guide rail 31 and the perpendicularity of the Y-direction vertical column 32, and adjust the straightness of the rack 1 window;

[0027] Step four, after the positioning and adjustment of the machine tool 3 are completed, sequentially machine process the balance bending roller cylinder mounting surface 11 of the rack 1 transmission side and the upper and lower and inner and outer positioning stopper 12, 13, 14, 15, the machining reference is divided from the center of the original design bolt hole, the tolerance reaches the balance bending roller cylinder mounting requirement, and new or old bolt holes are added according to the actual situation of the rack 1;

[0028] Step five, the transmission side of the rack 1 is modified, the newly added outer side mounting surface 16, the transverse key groove 17 and the screw hole 18 located between the balance bending roller cylinder mounting surface 11 and the newly added outer side mounting surface 16 are machined, after the outer side mounting surface 16 is machined, the transverse key groove 17 and the screw hole 18 are machined by using the pre-designed high-precision tooling template 4 for pasting plate machining, after the tooling template 4 is adjusted in place, it is welded and fixed, then the transverse key groove 17 is machined by using the machine tool 3, and the screw hole 18 is machined by using the magnetic seat drill;

[0029] Step six, the machine tool 3 adjusts the machining direction, and the balance bending roller cylinder mounting surface 19 and the upper and lower and left and right positioning stop 191, 192, 193, 194 on the operation side of the rack 1 are sequentially machined, the machining reference is divided from the center of the original design screw hole, the tolerance reaches the balance bending roller cylinder mounting requirement, according to the actual situation of the rack 1, the newly added or existing screw hole is machined.

[0030] Step seven, the level gauge and the laser tracker are used to detect the machining size of the transmission side and the operation side of the rack 1, so as to meet the installation precision requirement of the new type bending and running roller device of hot rolling.

[0031] Preferably, the rigid platform 2 in step one comprises an upper platform 21 and a lower platform 22 arranged in an upper and lower interval, and an equal-height support frame 23 is arranged between the upper platform 21 and the lower platform 22.

[0032] Preferably, the rigid platform 2 in step one is laid with a pattern plate at the gap of the rack 1 and is welded and fixed, and a fence is welded at the edge of the rigid platform.

[0033] Preferably, the horizontal degree of the X-direction horizontal guide rail 31 and the vertical degree of the Y-direction vertical column 32 in step three are respectively ≤0.05mm / m, and are detected by using the vertical instrument and the level gauge. The X-direction horizontal guide rail and the Y-direction vertical guide rail are both ball screw transmissions, the feed motor is a variable frequency motor, and the guide rail precision of the equipment is 0.02mm / m.

[0034] As shown in Figure 1 The mobile numerical control boring and milling machine tool is the core equipment for the modification of the rack balance bending roller cylinder mounting surface, the structure of which comprises an X-direction horizontal guide rail bed, a Y-direction vertical guide rail column and a bidirectional boring and milling head installed on the vertical guide rail column, the vertical guide rail column is directly installed on the horizontal guide rail to form a whole, the X-direction horizontal guide rail and the Y-direction vertical guide rail column are both ball screw transmissions, the feed motor is a variable frequency motor, and the guide rail precision of the equipment is 0.02mm / m. During the online modification process, the equipment is positioned on the rigid platform of the rack window repair part. After the machine tool is positioned, the transmission side bending roller cylinder mounting surface, the stop and the outer side are machined first, after the machining is completed, the high-precision transmission side outer side template tooling is installed, the outer side transverse key groove is machined by using the machine tool, after the machining is completed, the machine tool is turned to the operation side to machine the bending roller cylinder mounting surface and the stop, and the newly added screw hole of the transmission side is machined by using the magnetic seat drill and the drill sleeve.

[0035] like Figure 3 As shown, a tooling template is installed on the outer side of the mill's drive side. After the tooling template is fixed in place, the machine tool processes the transverse keyway on the outer side of the drive side. After the keyway is processed, a magnetic drill is used on the tooling template to add new screw holes on the outer side of the mill's drive side. The modified finishing mill stand meets the installation requirements of the new bending roll device, thereby significantly improving the stability and accuracy of the finishing mill rolling, shortening the quick roll change time, reducing maintenance, and improving the quality of the rolled plates from the hot strip finishing mill.

[0036] This method involves processing and modifying the mill frame for rolling mills that require bending roll modification, so that the processed mill structure can meet the installation requirements of the new bending roll device, and has high adaptability and special characteristics.

[0037] Compared to traditional frame machining methods, this method utilizes a modular, equal-height support frame to ensure the height and stability of the rigid platform, allowing the machine tool's machining stroke to completely cover the machined area, enabling one-time machining. Furthermore, this method employs a high-precision mobile CNC machine tool. The application of CNC programming significantly shortens the machining time. The CNC machine tool uses a two-way boring and milling head, allowing direct switching from the entry side to the exit side. Regarding spare parts manufacturing and selection, the process begins with designing and manufacturing a high-precision portable tooling template, followed by selecting high-speed cutting drills and milling cutters and high-efficiency custom-sized keyway cutters. The high-precision tooling template is designed and manufactured with an accuracy of 0.01mm, improving frame modification efficiency while shortening the frame machining cycle by tens of hours. To ensure successful machining on the first attempt, a high-precision portable laser tracker is used for re-inspection and control. Each process is seamlessly integrated, with optimized machining procedures as the foundation. The transmission-side window surface and spindle bracket mounting surface are machined first, followed by parallel machining of the transmission-side window surface and the large-size screw holes for the transmission-side spindle bracket mounting, greatly improving machining efficiency. During the processing and modification of the mill frame structure, various specifications of specialized high-precision tooling templates are used. These templates are designed and manufactured in advance according to the actual conditions of the rolling mill, such as drilling templates, balance bending roll cylinder mounting surface window templates, drill sleeves, stops, and height pads. The tooling templates are then attached to the parts to be processed and adjusted for fixation. Due to the high precision of the tooling templates themselves, the mill frame can be processed directly through them. The processed dimensions meet the corresponding tolerance requirements, reducing workload while improving the efficiency of processing and modification.

[0038] In addition, this method also involves the processing of new parts, including the addition of an outer mounting surface, screw holes, keyways, etc. on the transmission side of the stand. The modified finishing mill stand meets the installation requirements of the new bending roll device, thereby greatly improving the stability and accuracy of the finishing mill rolling.

[0039] Therefore, the method is efficient and practical, and has great reference significance and wide application value for similar rolling mills that need to be modified by bending and wandering rollers.

Claims

1. An online machining method for a stand used in the adaptive modification of a new hot rolling bending roll device, characterized in that... Includes the following steps: Step 1: Construct a rigid construction platform. Based on the lower support roller changing track, hoist the rigid platform for processing onto the changing track. Use the lower support roller changing trolley, changing guide rail, and hydraulic cylinder to push the rigid platform into the frame window and fix it in place by welding. Step 2: Inspect the frame window size tolerance, rigid platform positioning height, and the verticality and parallelism errors of the frame windows on the transmission and operation sides. Record the measurement results and determine the process reference for the mounting surface of the balance bending roller cylinder and the transverse keyway based on the measurement results. Step 3: Position and adjust the mobile CNC boring and milling machine. Hoist the mobile CNC boring and milling machine onto the rigid platform. The X-axis horizontal guide rail of the machine is set on the rigid platform, and the Y-axis vertical column for installing the bidirectional boring and milling head is set on the X-axis horizontal guide rail. Adjust the levelness of the X-axis horizontal guide rail and the verticality of the Y-axis vertical column, and adjust the straightness of the frame window. Step 4: After the machine tool is positioned and adjusted, the mounting surface of the balance bending roller cylinder on the transmission side of the machine frame, as well as the upper and lower and inner and outer positioning stops, are machined in sequence. The machining datum is divided from the center of the original bolt hole, and the tolerance meets the installation requirements of the balance bending roller cylinder. According to the actual situation of the machine frame, new bolt holes are added or existing bolt holes are reused. Step 5: Modify the transmission side of the frame, and machine the new outer mounting surface, the transverse keyway and screw hole located on the mounting surface of the balance bending roller cylinder and the new outer mounting surface. After the outer mounting surface is machined, the transverse keyway and screw hole are machined by attaching the pre-designed high-precision tooling template. After the tooling template is in place and adjusted, it is welded and fixed. Then, the transverse keyway is machined by machine tool and the screw hole is machined by magnetic drill. Step 6: Adjust the machining direction of the machine tool and machine the mounting surface of the balance bending roller cylinder on the operating side of the machine frame, as well as the upper and lower and left and right positioning stops in sequence. The machining datum is divided from the center of the original design screw hole, and the tolerance meets the installation requirements of the balance bending roller cylinder. Add or reuse screw holes according to the actual situation of the machine frame. Step 7: Use a level and laser tracker to check the machining dimensions of the transmission side and operation side of the frame to meet the installation accuracy requirements of the new hot rolling bending roll device.

2. The online processing method for the stand for adaptive modification of a new hot rolling bending roll device according to claim 1, characterized in that: The rigid platform in step one includes an upper platform and a lower platform arranged at intervals, with a support frame of equal height installed between the upper platform and the lower platform.

3. The online processing method for the adaptability modification of a new hot rolling bending roll device according to claim 1 or 2, characterized in that: In step one, patterned plates are laid and welded to the gap between the rigid platform and the frame, and a fence is welded to the edge of the rigid platform.

4. The online processing method for the stand for adaptive modification of a new hot rolling bending roll device according to claim 1, characterized in that: In step three, the horizontality of the X-direction horizontal guide rail and the verticality of the Y-direction vertical column are both ≤0.05mm / m, and are checked using a verticality meter and a level meter.

Images