On-line machine frame machining method for adaptive transformation of novel hot rolling roll bending and shifting device

Abstract

The invention discloses an on-line rack machining method for adaptive transformation of a novel hot rolling roll bending and shifting device, which comprises the following steps of: building a rigid construction platform at a rack window, adaptively transforming the rack by adopting a movable boring and milling machine tool, and finely adjusting the position to ensure the precision after the machine tool is in place; a high-precision tool template for machining and related equipment for machine frame transformation are arranged, the machining standard is determined according to original state detection data, and the machine frame is machined and transformed with the window face position of the machine frame where the balance roll bending cylinder is installed as the machining standard. Processing a balance roll bending cylinder mounting surface, inner, outer, upper and lower spigots, a newly added outer side mounting surface on the transmission side of the rack, a balance key slot, a screw hole and the like; after machine tool machining is completed, a level gauge and a laser tracker are adopted for detecting machining precision, and the requirement for installation precision of the novel hot-rolling roll bending and shifting device is met. The method ensures high-precision implementation of machining operation, improves the machining operation efficiency, saves the equipment modification cost, and further improves the rolling stability and precision of the rolling mill.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical equipment transformation, and in particular to an online processing method for a frame used for adaptive transformation of a new type of hot rolling bending and shifting roll device. Background Art

[0002] At present, the market has increasingly higher requirements for the plate shape accuracy of hot-rolled strips and medium and thick plate products. The bending and shifting rolls and transverse shifting devices of rolling mill work rolls have become the first choice and the best solution for enterprises to solve plate shape problems. The bending and shifting rolls and transverse shifting devices are the core parts of hot rolling mills. Most hot rolling production line mills use working roll bending and shifting rolls and working roll transverse shifting devices to control and improve plate shape. In particular, the finishing rolling units in hot rolling production lines are basically equipped with working roll bending and shifting rolls and transverse shifting devices. The effect of this device in controlling plate shape has been confirmed in the production practice of major steel mills at home and abroad. As one of the core components of the four-roll hot rolling mill, the rationality of the structure of the working roll bending and shifting roll and transverse shifting device has an important impact on the production rhythm, equipment maintenance, and product quality. At present, most finishing mill bending and shifting roll devices use a fixed block plus a moving block structure. This structure will result in more sliding surfaces in the device, and the gap is difficult to eliminate after wear, resulting in large deviations in the accuracy of the bending and shifting rolls, unstable rolling process, zero drift and other problems, which seriously affect the plate shape control and lead to poor plate shape, especially when rolling thin-gauge products. In addition, the device has many blind spots for roll changing, and personnel need to confirm on site, which affects automatic roll changing, resulting in longer roll changing time and affecting the output of the hot rolling production line. Furthermore, the device has a complex structure, a large number of spare parts, and high subsequent maintenance costs.

[0003] In view of the above reasons, some domestic steel mills have begun to introduce new fixed bending and shifting roll devices. The new fixed bending and shifting roll device adopts fixed bending rolls and transverse shifting devices, equipped with independent balanced bending roll cylinders, and is composed of four steel blocks: operating side inlet and outlet bending roll blocks, transmission side inlet and outlet bending roll blocks. The main advantages of the new fixed block bending and shifting roll structure are: simple structure, fewer matching surfaces; good overall stability, fewer spare parts; long life, low subsequent maintenance costs; automatic roll change, reduced roll change window time, etc. The introduction of the new fixed bending and shifting roll device solves a series of drawbacks of the traditional bending and shifting roll device, but the new fixed bending and shifting roll device does not match the structure of the original rolling mill frame, which involves adaptive modification of the rolling mill frame, so that the modified frame arch can meet the installation requirements of the new fixed bending and shifting roll device and meet the subsequent series of production processes of the hot rolling production line.

[0004] The upgrade and transformation of the bending and shifting roll device puts forward corresponding requirements on the structure of the hot rolling finishing mill frame. The frame structure of the rolling mill needs to be adapted to the new bending and shifting roll device. Therefore, it is necessary to carry out online processing and transformation of the rolling mill frame to adapt to the subsequent installation requirements. Specifically, the bending roll cylinder surface and newly added parts related to the new structure of the frame are processed and transformed, including the bending roll cylinder surface on the operating side and transmission side of the frame, internal and external stoppers and upper and lower stoppers, newly added installation surfaces on the outer side of the frame transmission side, transverse keyways and screw holes, etc., while traditional machining methods cannot realize online processing of the rolling mill frame. Summary of the invention

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

[0006] In order to solve the above technical problems, the frame online processing method for adaptive transformation of a new type of hot rolling bending and shifting roll device of the present invention comprises the following steps: Step 1: Build a rigid construction platform, based on the lower support roller changing track, hoist the rigid platform for processing onto the roller changing track, use the lower support roller changing trolley, roller changing guide rail and oil cylinder to push the rigid platform into the frame window and weld it into place; Step 2: Detect the frame window size tolerance, rigid platform positioning height size, and frame window verticality and parallelism errors on the frame transmission side and operating side, record the measurement results, and determine the process benchmark for the installation surface of the balance bending roll cylinder and the transverse keyway processing based on the measurement results; Step 3: The mobile CNC boring and milling machine is positioned and adjusted. The mobile CNC boring and milling machine is hoisted to the rigid platform. The X-axis horizontal guide rail of the machine is set on the rigid platform. The Y-axis vertical column for installing the bidirectional boring and milling head is set on the X-axis horizontal guide rail. The horizontality of the X-axis horizontal guide rail and the verticality of the Y-axis vertical column are adjusted, and the straightness of the frame window is adjusted. Step 4: After the machine tool is positioned and adjusted, the installation surface of the balance bending roll cylinder on the transmission side of the frame and the upper and lower and inner and outer positioning seams are machined in sequence. The machining datum is divided by the center of the original designed bolt hole, and the tolerance meets the installation requirements of the balance bending roll cylinder. According to the actual situation of the frame, new or old screw holes are added; Step 5: Reconstruct the transmission side of the frame, machine the newly added outer mounting surface, the transverse keyway and screw hole located on the mounting surface of the balance bending roller cylinder and the newly added outer mounting surface. After the outer mounting surface is machined, the transverse keyway and screw hole are machined using a pre-designed high-precision tooling template. After the tooling template is adjusted in place, it is welded and fixed. Then, the machine tool is used to complete the transverse keyway processing, and the magnetic drill is used to complete the screw hole processing. Step 6: Adjust the processing direction of the machine tool, and machine the installation surface of the balance bending roll cylinder on the operating side of the frame, as well as the upper and lower and left and right positioning seams in turn. The machining datum is divided by the center of the original designed screw hole, and the tolerance meets the installation requirements of the balance bending roll cylinder. Add or reuse screw holes according to the actual situation of the frame; Step 7. Use a level and laser tracker to detect the machining dimensions of the transmission side and operating side of the frame to meet the installation accuracy requirements of the new hot rolling bending and shifting roll device.

[0007] Furthermore, in the step 1, the rigid platform includes an upper platform and a lower platform which are spaced apart from each other, and an equal-height support frame is provided between the upper platform and the lower platform.

[0008] Furthermore, in the step one, a patterned plate is laid at the gap between the rigid platform and the frame and fixed by welding, and a fence is welded at the edge of the rigid platform.

[0009] Furthermore, the horizontality of the X-axis horizontal guide rail and the verticality of the Y-axis vertical column in the step three are respectively ≤0.05mm / m, and are inspected using a plumb line and a level.

[0010] Since the frame online processing method for adaptive transformation of the new hot rolling bending and shifting roller device of the present invention adopts the above technical scheme, that is, the method builds a rigid platform on the frame window, uses a mobile boring and milling machine to adaptively transform the frame, fine-tunes the position of the machine tool after it is in place to ensure accuracy, is equipped with high-precision tooling templates for processing and related equipment for frame transformation, determines the processing reference according to the original state detection data, takes the frame window surface position of the balanced bending roller cylinder installation as the processing reference, and processes and transforms the frame, processes the balanced bending roller cylinder installation surface, the internal and external upper and lower stoppers, the newly added outer mounting surface on the transmission side of the frame, the balancing keyway, the screw hole, etc.; after the machine tool processing is completed, the level and laser tracker are used to detect the processing accuracy to meet the installation accuracy requirements of the new hot rolling bending and shifting roller device. This method enables the processed rolling mill frame to adapt to the installation requirements of the new bending roller device, ensures the high-precision implementation of the processing operation, improves the processing operation efficiency, saves the equipment transformation cost, and thus improves the stability and accuracy of the rolling of the rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the construction of a rigid platform and the positioning of the machine tool in the online processing method of the machine frame; Figure 2 This is a schematic diagram of the processing position of the mounting surface of the balance bending roller cylinder on the transmission side and the operating side of the frame in the online processing method of the frame; Figure 3 This is a schematic diagram of the tooling template in place in the online processing method of the machine frame; Figure 4 This is a flowchart of the online processing method for this frame. DETAILED DESCRIPTION

[0012] Implementation example Figures 1 to 4 As shown, the frame online processing method for adaptively modifying the new hot rolling bending and shifting roll device of the present invention comprises the following steps: Step 1: Build the construction rigid platform 2, based on the lower support roller changing track, lift the processing rigid platform 1 onto the roller changing track, use the lower support roller changing trolley, roller changing guide rail and oil cylinder to push the rigid platform into the window of the frame 1 and weld it into place; Step 2: Detect the size tolerance of the window of frame 1, the positioning height size of the rigid platform 2, and the verticality and parallelism errors of the window of the frame on the transmission side and the operating side of frame 1, record the measurement results, and determine the process benchmark for the installation surface of the balance bending roll cylinder and the transverse keyway processing according to the measurement results; Step 3: The mobile CNC boring and milling machine 3 is positioned and adjusted. The mobile CNC boring and milling machine 3 is hoisted to the rigid platform 2. The X-axis horizontal guide rail 31 of the machine 3 is arranged on the rigid platform. The Y-axis vertical column 32 for installing the bidirectional boring and milling head 33 is arranged on the X-axis horizontal guide rail 31. The horizontality of the X-axis horizontal guide rail 31 and the verticality of the Y-axis vertical column 32 are adjusted, and the straightness of the window of the frame 1 is adjusted. Step 4: After the machine tool 3 is adjusted in place, the mounting surface 11 of the balanced roller bending cylinder on the transmission side of the frame 1 and the upper and lower and inner and outer positioning stops 12, 13, 14, 15 are machined in sequence. The machining datum is divided by the center of the original designed bolt hole, and the tolerance meets the installation requirements of the balanced roller bending cylinder. According to the actual situation of the frame 1, new or old screw holes are added; Step 5: Reconstruct the transmission side of the frame 1, machine the newly added outer mounting surface 16, the transverse keyway 17 and the screw hole 18 located on the mounting surface 11 of the balance bending roll cylinder and the newly added outer mounting surface 16, after the outer mounting surface 16 is machined, the transverse keyway 17 and the screw hole 18 are machined using the pre-designed high-precision tooling template 4 for plate mounting, the tooling template 4 is welded and fixed after being adjusted in place, and then the machine tool 3 is used to complete the machining of the transverse keyway 17, and the magnetic base drill is used to complete the machining of the screw hole 18; Step 6: The machine tool 3 adjusts the processing direction, and sequentially processes the installation surface 19 of the balance bending roll cylinder on the operating side of the frame 1 and the upper and lower and left and right positioning stops 191, 192, 193, 194. The machining datum is divided by the center of the original designed screw hole, and the tolerance meets the installation requirements of the balance bending roll cylinder. According to the actual situation of the frame 1, new or old screw holes are added; Step 7: Use a level and a laser tracker to detect the machining dimensions of the transmission side and the operating side of the frame 1 to meet the installation accuracy requirements of the new hot rolling bending and shifting roll device.

[0013] Preferably, in step 1, the rigid platform 2 comprises an upper platform 21 and a lower platform 22 which are spaced apart from each other, and an equal-height support frame 23 is provided between the upper platform 21 and the lower platform 22 .

[0014] Preferably, in the step 1, a patterned plate is laid at the gap between the rigid platform 2 and the frame 1 and fixed by welding, and a fence is welded at the edge of the rigid platform.

[0015] Preferably, the horizontality of the X-axis horizontal guide rail 31 and the verticality of the Y-axis vertical column 32 in step 3 are ≤0.05mm / m respectively, and are inspected by a vertical meter and a level meter. The X-axis horizontal guide rail and the Y-axis vertical guide rail are both ball screw driven, the feed motor is a variable frequency motor, and the equipment guide rail accuracy is 0.02mm / m.

[0016] like Figure 1 As shown in the figure, the mobile CNC boring and milling machine is the core equipment for the modification of the mounting surface of the frame balance bending roller cylinder. Its structure consists of an X-axis horizontal guide bed, a Y-axis vertical guide column and a bidirectional boring and milling head installed on the vertical column. The vertical guide column is directly installed on the horizontal guide as a whole. The X-axis horizontal guide and the Y-axis vertical guide column are both ball screw driven, and the feed motor is a variable frequency motor. The equipment guide rail accuracy is 0.02mm / m. During the online modification process, the equipment is placed on the rigid platform for the construction of the frame window repair part. After the machine tool is in place, the mounting surface, stopper and outer side of the bending roller cylinder on the transmission side are first processed. After the processing is completed, the high-precision transmission side outer template tooling is installed, and the outer transverse keyway is processed by the machine tool. After the processing is completed, the machine tool is transferred to the operating side to process the bending roller cylinder mounting surface and stopper. The newly added screw holes on the transmission side are processed using a magnetic drill and a drill sleeve.

[0017] like Figure 3 As shown in the figure, the tooling template is installed on the outer side of the transmission side of the rolling mill. After the tooling template is fixed in place, the machine tool processes the transverse keyway on the outer side of the transmission side. After the keyway processing is completed, a magnetic drill is used on the tooling template to add screw holes on the outer side of the transmission side of the rolling mill. The machined and modified finishing mill frame meets the installation requirements of the new bending and shifting roll device, thereby greatly improving the rolling stability and accuracy of the finishing mill, shortening the rapid roll change time, reducing the maintenance, and improving the quality of the rolled plates of the hot rolling finishing mill unit.

[0018] This method implements frame processing and transformation for a rolling mill that needs to be transformed into a bending and shifting roll, so that the structure of the mill after processing can adapt to the installation requirements of a new type of bending roll device, and has high adaptability and specificity.

[0019] Compared with the traditional rack processing method, the modular equal-height support frame used in this method ensures the height and stability of the rigid platform, so that the processing stroke of the machine tool completely covers the part of the rack to be processed, so that the machine tool processing can be completed at one time. In addition, this method uses a high-precision mobile CNC machine tool. The application of CNC programming greatly shortens the processing time of the machine tool. The CNC machine tool uses a bidirectional boring and milling head, which can be directly transferred from the entry side processing to the exit side processing. In terms of spare parts production and selection, it starts from the design and manufacture of high-precision portable tooling templates to the selection of high-speed cutting drilling and milling cutters and high-efficiency customized specification forming keyway milling cutters. The high-precision tooling template used has a design and manufacturing accuracy of 0.01mm, which improves the efficiency of rack transformation and shortens the rack processing cycle by dozens of hours. In order to ensure the processing accuracy is successful at one time, the process is re-checked and controlled by a high-precision portable laser tracker. Each process is seamlessly connected, with the optimization of the processing process as the basis. The transmission side window surface and the spindle bracket mounting surface are first processed, and then the transmission side window surface processing and the transmission side spindle bracket installation large-size screw hole are parallelly constructed, which greatly improves the processing efficiency. In the process of processing and modifying the frame structure, a variety of special high-precision tooling templates are used. They are designed and manufactured in advance according to the actual situation of the rolling mill, such as drilling templates, window templates for the installation surface of the balance bending roll cylinder, drill sleeves, blocks and height pads, etc. The tooling templates are fixed and adjusted for the processing parts. Since the tooling templates themselves are very accurate, the frame can be processed directly through the tooling templates. The processed dimensions meet the corresponding tolerance requirements, which reduces the workload and improves the efficiency of processing and modification.

[0020] In addition, this method also involves the processing of newly added parts, including a new outer mounting surface, new screw holes, keyways, etc. on the transmission side of the frame. The processed and modified finishing mill frame meets the installation requirements of the new bending and shifting roller device, thereby greatly improving the rolling stability and accuracy of the finishing mill.

[0021] Therefore, this method is efficient and practical, and has great reference significance and wide application value for similar rolling mills that need to undergo bending and shifting roll transformation.

Claims

1. A frame online processing method for adaptive transformation of a new type of hot rolling bending and shifting roll device, characterized in that The steps include: Step 1: Build a rigid construction platform, based on the lower support roller changing track, hoist the rigid platform for processing onto the roller changing track, use the lower support roller changing trolley, roller changing guide rail and oil cylinder to push the rigid platform into the frame window and weld it into place; Step 2: Detect the frame window size tolerance, rigid platform positioning height size, and frame window verticality and parallelism errors on the frame transmission side and operating side, record the measurement results, and determine the process benchmark for the installation surface of the balance bending roll cylinder and the transverse keyway processing based on the measurement results; Step 3: The mobile CNC boring and milling machine is positioned and adjusted. The mobile CNC boring and milling machine is hoisted to the rigid platform. The X-axis horizontal guide rail of the machine is set on the rigid platform. The Y-axis vertical column for installing the bidirectional boring and milling head is set on the X-axis horizontal guide rail. The horizontality of the X-axis horizontal guide rail and the verticality of the Y-axis vertical column are adjusted, and the straightness of the frame window is adjusted. Step 4: After the machine tool is positioned and adjusted, the installation surface of the balance bending roll cylinder on the transmission side of the frame and the upper and lower and inner and outer positioning seams are machined in sequence. The machining datum is divided by the center of the original designed bolt hole, and the tolerance meets the installation requirements of the balance bending roll cylinder. According to the actual situation of the frame, new or old screw holes are added; Step 5: Reconstruct the transmission side of the frame, machine the newly added outer mounting surface, the transverse keyway and screw hole located on the mounting surface of the balance bending roller cylinder and the newly added outer mounting surface. After the outer mounting surface is machined, the transverse keyway and screw hole are machined using a pre-designed high-precision tooling template. After the tooling template is adjusted in place, it is welded and fixed. Then, the machine tool is used to complete the transverse keyway processing, and the magnetic drill is used to complete the screw hole processing. Step 6: Adjust the processing direction of the machine tool, and machine the installation surface of the balance bending roll cylinder on the operating side of the frame, as well as the upper and lower and left and right positioning seams in turn. The machining datum is divided by the center of the original designed screw hole, and the tolerance meets the installation requirements of the balance bending roll cylinder. Add or reuse screw holes according to the actual situation of the frame; Step 7. Use a level and laser tracker to detect the machining dimensions of the transmission side and operating side of the frame to meet the installation accuracy requirements of the new hot rolling bending and shifting roll device.

2. The frame online processing method for adaptive transformation of a new type of hot rolling bending and shifting roll device according to claim 1 is characterized in that: In the step 1, the rigid platform includes an upper platform and a lower platform which are spaced apart from each other, and an equal-height support frame is arranged between the upper platform and the lower platform.

3. The frame online processing method for adaptive transformation of a new type of hot rolling bending and shifting roll device according to claim 1 or 2 is characterized in that: In the step 1, a patterned plate is laid at the gap between the rigid platform and the frame and fixed by welding, and a fence is welded at the edge of the rigid platform.

4. The frame online processing method for adaptive transformation of a new type of hot rolling bending and shifting roll device according to claim 1 is characterized in that: The horizontality of the X-axis horizontal guide rail and the verticality of the Y-axis vertical column in the step 3 are ≤ 0.05 mm / m respectively, and are checked using a plumb line and a level.

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