Grinding wheel assembly apparatus, grinding wheel assembly method, and grinding method for rolling mill rolls

Abstract

To provide a technique that can install and disassemble a grindstone with a holder without changing the posture and easily assemble the holder to a new grindstone.SOLUTION: A device for disassembling and assembling a grindstone with a holder includes: a base on which components of a grindstone assembly device are installed; a grindstone support table which holds the grindstone with holder while maintaining the posture such that the axial direction of the grindstone becomes the horizontal direction, and is installed so as to be movable in the vertical direction and in the axial direction of the grindstone; a grindstone support shaft which detachably supports one side of the grindstone holder; a grindstone holder attachment / detachment mechanism which is installed such that the other side of the grindstone holder is fixed to the surface side opposed to the grindstone support shaft with respect to the grindstone, and so as to be movable in the axial direction of the grindstone. The grindstone holder attachment / detachment mechanism includes: a grindstone holder support member for fixing the other side of the grindstone holder; and a shaft arranged coaxially with the grindstone support shaft, supporting the grindstone holder support member and movable in the axial direction of the grindstone.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates to a grinding wheel assembling device for grinding, and particularly to a device for easily assembling a grinding wheel to be attached to a grinding machine for polishing a rolling roll, a method for replacing the grinding wheel using the same, and a method for polishing a rolling roll including the method. 【Background Art】 【0002】 Conventionally, a rolling roll has been polished with a grinding machine equipped with a grinding wheel to remove flaws on the rolling roll. When a certain discard criterion is reached, the grinding wheel is replaced with a new one. For this grinding wheel replacement, the old grinding wheel is removed from the grinding machine using a sling, and the removed grinding wheel is placed on a cart and transported to a maintenance yard, where it is lowered horizontally onto the floor, and each bolt of the grinding wheel holder provided for attaching the grinding machine and the grinding wheel is removed. This grinding wheel holder sandwiches a grinding wheel shaped like a cylinder (annular disc) from both side surfaces. When each bolt is removed, the upper grinding wheel holder is held and lowered to remove the grinding wheel. Next, after thoroughly cleaning each inside of the removed holder, a new grinding wheel is taken out and set in the holder. Thus, the grinding wheel newly attached to the grinding wheel holder is attached to the grinding machine using a sling. 【0003】 The series of roll grinding wheel replacement operations is frequent, and all of the series of operations are manual. Furthermore, the weight of a single new grinding wheel exceeds 100 kg, and when the holder is attached, it exceeds 150 kg. Since such heavy objects are handled and assembled by setting them in the holder by holding the grinding wheel holder with multiple people or placing it on the floor, there have been cases of causing low back pain due to transporting heavy objects or causing accidents by being pinched. Also, this replacement operation is impossible for one person to perform, and at least two people are required for this operation, and the time required for one replacement is also long. 【0004】 Therefore, for example, Patent Document 1 discloses a grinding wheel assembling device having a grinding wheel assembling support shaft provided at the central position in the longitudinal direction of a rotatable grinding wheel support frame for detachably providing a grinding wheel holder, and assembling the grinding wheel with this support shaft. [Prior art documents] [Patent Documents] 【0005】 [Patent Document 1] Japanese Utility Model Publication No. 06-024832 [Overview of the project] [Problems that the invention aims to solve] 【0006】 However, the above-mentioned conventional technology had the following problems. In other words, in the apparatus described in Patent Document 1, the discarded grinding wheel removed from the grinding machine must be tilted 90 degrees so that the disc surface is horizontal and placed on the floor. In addition, there is a lifting operation to hoist the grinding wheel holder with a lifting device, which has little effect on reducing the risk of accidents. Moreover, it also contributed to a decrease in the operating rate of the grinding machine. 【0007】 The present invention has been made in view of the above, and aims to provide a grinding wheel assembly device that can install and disassemble a grinding wheel with a holder removed from a grinding machine without changing its orientation, and can easily assemble the holder onto a new grinding wheel. Furthermore, the present invention aims to propose a method for replacing grinding wheels using this device, and a method for grinding rolling rolls that includes this method in the work process. [Means for solving the problem] 【0008】 The present invention, which advantageously solves the above problems, is a grinding wheel assembly device for disassembling and assembling a holder-equipped grinding wheel, which is composed of a grinding wheel made of an annular disc and a pair of grinding wheel holders that hold the grinding wheel from both sides in a coaxial arrangement, comprising: a base on which each part of the grinding wheel assembly device is installed; a grinding wheel support base that holds the holder-equipped grinding wheel while maintaining a posture in which the axial direction of the grinding wheel is horizontal, and is installed to be movable in the vertical direction and in the axial direction of the grinding wheel; a grinding wheel support shaft for detachably supporting one of the grinding wheel holders; and a grinding wheel holder detachment mechanism that fixes the other grinding wheel holder to the side of the grinding wheel facing the grinding wheel support shaft and is installed to be movable back and forth in the axial direction of the grinding wheel, wherein the grinding wheel holder detachment mechanism comprises: a grinding wheel holder support member for fixing the other grinding wheel holder; and a shaft that is coaxially arranged with the grinding wheel support shaft, supports the grinding wheel holder support member, and is installed to be movable back and forth in the axial direction of the grinding wheel. 【0009】 Furthermore, a more preferable solution for the grinding wheel assembly apparatus according to the present invention is that the grinding wheel holder support member is rotatably supported with respect to the shaft, and that the grinding wheel holder support member has a fixing mechanism that allows it to rotate in sync with the shaft. 【0010】 The grinding wheel assembly method according to the present invention, which advantageously solves the above problems, involves using any of the above-mentioned grinding wheel assembly devices, and performing the following tasks: installing a holder-equipped grinding wheel removed from a polishing machine onto the grinding wheel support base of the grinding wheel assembly device; moving the grinding wheel support base up and down to align the axis of the grinding wheel holder with the axis of the grinding wheel support shaft, moving the grinding wheel support base toward the grinding wheel support shaft, and inserting the grinding wheel support shaft into one of the grinding wheel holders; advancing the grinding wheel holder attachment / detachment mechanism of the grinding wheel assembly device toward the other grinding wheel holder, and fastening the grinding wheel holder support member to the other grinding wheel holder; and releasing the fixing of the grinding wheel holders together, retracting the grinding wheel holder attachment / detachment mechanism, and removing the grinding wheel holder from the grinding wheel. The work is characterized by including the following steps: moving the grinding wheel support stand away from the grinding wheel support shaft, separating the grinding wheel and the grinding wheel holder, and then removing the grinding wheel from the grinding wheel support stand; installing a replacement grinding wheel on the grinding wheel support stand; moving the grinding wheel support stand up and down to align the axis of the grinding wheel support shaft, which holds one of the grinding wheel holders, with the axis of the replacement grinding wheel; moving the grinding wheel support stand toward the grinding wheel support shaft to bring one of the grinding wheel holders and the replacement grinding wheel into close contact; advancing the grinding wheel holder attachment / detachment mechanism to bring the other end of the grinding wheel holder, which is fixed to the grinding wheel holder support member, into close contact with the replacement grinding wheel; and clamping and fixing the replacement grinding wheel between the grinding wheel holders. 【0011】 The present invention provides a method for polishing rolling rolls that advantageously solves the above problems, comprising polishing a rolling roll with a grinding wheel of a polishing machine, wherein the grinding wheel assembly method is included in the grinding wheel replacement work step, and further comprising the work of removing a holder-equipped grinding wheel that is deemed to need to be replaced from the rolling roll polishing machine, and the work of attaching the assembled holder-equipped replacement grinding wheel to the polishing machine. [Effects of the Invention] 【0012】 According to the grinding wheel assembly apparatus and grinding wheel assembly method of the present invention, a grinding wheel with a holder attached, removed from a grinding machine, can be disassembled and assembled without changing its orientation. The risk of the grinding wheel or holder tipping over during grinding wheel replacement is eliminated, improving safety and work efficiency. Furthermore, because the grinding wheel assembly apparatus according to the present invention has a simple structure and is lightweight, it does not need to be fixed to the ground or the like and can be placed on a trolley, making it highly portable and easy to handle. In addition, the grinding method for rolling mill rolls according to the present invention shortens the time required for grinding wheel replacement, improving the productivity of rolling mill roll grinding and reducing costs, thus making it industrially useful. [Brief explanation of the drawing] 【0013】 [Figure 1] This is a schematic perspective view showing the configuration of a grinding wheel assembly device according to one embodiment of the present invention. [Figure 2] The above-mentioned grinding wheel assembly device is shown in three views, where (a) is a top view, (b) is a side view, and (c) is a front view. [Figure 3] This is a vertical cross-sectional view of a grinding wheel with a holder. [Figure 4] This is a schematic cross-sectional view illustrating a method for separating the grinding wheel holder, where (a) shows the state before separation of the holder, (b) shows the case where the plate is retracted without synchronization with the rotation of the shaft, and (c) shows the case where the plate is retracted while synchronizing with the rotation of the shaft. [Modes for carrying out the invention] 【0014】 Embodiments of the present invention will be described in detail below with reference to the drawings. The following embodiments are illustrative examples of devices and methods for realizing the technical concept of the present invention, and do not limit the configuration to those described below. That is, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims. 【0015】 Figure 1 is a schematic perspective view showing the configuration of a grinding wheel assembly device according to one embodiment of the present invention. Figure 2(a) is a plan view showing the configuration of the grinding wheel assembly device, Figure 2(b) is a side view, and Figure 2(c) is a front view. Figure 3 is a vertical cross-sectional view of a grinding wheel with a holder. 【0016】 The grinding wheel assembly device 10 according to this embodiment is constructed on a base 1 assembled from steel materials and includes a grinding wheel support 2, a grinding wheel support shaft 4, and a grinding wheel holder attachment / detachment mechanism 3. The base 1 has an H-shaped steel frame 1A, a base plate 1B, a rail 1C, and a steel pipe handle 1D. The lower part of the base 1 has a pair of fixed wheels 1E and a pair of swivel wheels 1F. Instead of installing wheels on the base, the grinding wheel assembly device 10 of this embodiment may be loaded onto a trolley. Because the grinding wheel assembly device 10 according to this embodiment has a simple structure and is lightweight, it does not need to be fixed to the ground or the like, and can be placed on a trolley, making it highly portable and easy to handle. 【0017】 The grinding wheel holder 2 has a pair of grinding wheel holder plates 2A that guide and receive the grinding wheel 5 while maintaining a position in which the axial direction of the grinding wheel 5 is horizontal. Furthermore, it has a lever 2C installed between the grinding wheel holder plates 2A to hold the grinding wheel 5, a grinding wheel holder lifter 2B that moves the grinding wheel 5 up and down, and a flange groove wheel 2D installed below the grinding wheel holder lifter 2B that runs on rail 1C. The grinding wheel holder plates 2A are notched in a U shape to facilitate the attachment and detachment of the grinding wheel holder 6, forming an inverted gate shape. The upper part of the plates has opposing ends that are bent outward, so that even if there is a misalignment when receiving the grinding wheel 5, it can be easily received between the grinding wheel holder plates 2A. The lever 2C has a recess in the longitudinal center with a smaller radius partial cylindrical surface, and is connected on both sides with larger radius partial cylindrical surfaces. Preferably, the radius on the smaller side is about the same as the radius of the cylindrical surface that has become smaller due to wear of the used grinding wheel 5 being received. The larger radius is preferably about the same as the radius of the new grinding wheel. The grinding wheel support base 2 facilitates vertical movement by the grinding wheel support lifter 2B and movement of the grinding wheel 5 in the direction of the rotation axis by running on the rail 1C. In addition, by setting the manbo 2C in an appropriate position in the horizontal direction perpendicular to the axis of the grinding wheel 5, it can be aligned with the axis of the grinding wheel support shaft 4 and the grinding wheel holder attachment / detachment mechanism 3, which will be described later. 【0018】 The grinding wheel holder attachment / detachment mechanism 3 includes a disc-shaped plate as a grinding wheel holder support member 3A, and a shaft 3C that supports the grinding wheel holder support member 3A and is installed to move back and forth in the axial direction of the grinding wheel 5. In the examples of Figures 1 and 2, the shaft 3C fixedly and rotatably supports the center of the disc-shaped plate 3A, and has a helical groove formed on its outer circumference. The grinding wheel holder attachment / detachment mechanism 3 also includes a screw 3E with an inner helical groove that screws into the helical groove of the bearing 3F and the shaft 3C, fixed to the base 1 via a support column 3D, and a handle 3B at the other end of the shaft 3C for rotating the shaft 3C. The disc-shaped plate 3A is designed so that the grinding wheel holder 6 can be fixed with bolts. The disc-shaped plate 3A and the shaft 3C can rotate synchronously and move back and forth rotatably relative to the shaft 3C by a fixing pin 3G. 【0019】 In the examples of FIGS. 1 and 2, the grinding wheel support shaft 4 includes two tapered shafts 4A facing both sides of a rotary table 4B mounted on the frame 1A of the base 1. The central axis of the tapered shaft 4A is installed so as to coincide with the central axis of the shaft 3C of the grinding wheel holder attaching / detaching mechanism 3. Although the diameter and shape of the grinding wheel support shaft 4 are not particularly specified, it is preferable to use a tapered shaft as the grinding wheel support shaft for improving workability. By forming the tapered shaft 4A into a frustum shape with a tapered tip, it can be smoothly inserted into the shaft of the grinding wheel holder 6. Also, it is preferable that the rotary table 4B has a positioning pin (not shown) so that the tapered shaft 4A can be fixed at an appropriate position. 【0020】 Next, a grinding wheel assembling method using the grinding wheel assembling apparatus of the present embodiment will be described. First, in the disassembling operation, the grinding wheel 5 with the holder 6 removed from a grinding machine (not shown) (also referred to as a waste grinding wheel) is installed on the grinding wheel receiving base 2 of the grinding wheel assembling apparatus 10. At this time, it is inserted vertically between the grinding wheel receiving plates 2A of the grinding wheel receiving base 2 without making the circular plate surface of the grinding wheel 5 horizontal. 【0021】 Next, the grinding wheel receiving base 2 is moved up and down by the grinding wheel receiving lifter 2B to align the axis of the grinding wheel holder 6 and the axis of the grinding wheel support shaft 4. Then, the grinding wheel receiving base 2 is moved toward the grinding wheel support shaft 4 side, and the tapered shaft 4A of the grinding wheel support shaft 4 is inserted into and fixed to one side of the grinding wheel holder 6. At this time, it is preferable to arrange the central axis of the grinding wheel support shaft 4 to be included in the vertical plane including the central axis of the cylindrical surface at the center of the universal bar installed at the bottom between the grinding wheel receiving plates 2A. 【0022】 Next, advance the grinding wheel holder detaching mechanism 3 of the grinding wheel assembling device 10 toward the other side of the grinding wheel holder 6, and fasten the disc-shaped plate 3A as a grinding wheel holder support member and the other side of the grinding wheel holder 6 with bolts 7 (Fig. 4(a)). After that, release the fixation between the grinding wheel holders 6, retract the grinding wheel holder detaching mechanism 3, and remove the grinding wheel holder 6 from the grinding wheel 5. At this time, as shown in Fig. 4(c), fix them with a fixing pin 3G so that the disc-shaped plate 3A and the shaft 3C rotate synchronously. By doing so, the disc-shaped plate 3A follows the rotation of the forward / backward handle 3B, making it easier to maintain the parallel relationship between the axis of the grinding wheel 5 and the axis of the grinding wheel holder 6 and easier to remove. On the other hand, as shown in Fig. 4(b), if the shaft 3C is retracted without the disc-shaped plate 3A and the shaft 3C being synchronized, the plate-side grinding wheel holder 6B will tilt and get caught on the grinding wheel 5, making it difficult to remove. 【0023】 Then, move the grinding wheel receiver 2 in a direction away from the grinding wheel support shaft 4. After separating the discarded grinding wheel 5 and the grinding wheel holder 6, remove the discarded grinding wheel 5 from the grinding wheel receiver 2. After that, receive a new grinding wheel 5 for replacement on the grinding wheel receiver 2, and assemble the grinding wheel with a holder in the reverse procedure of the disassembly operation. Specifically, move the grinding wheel receiver 2 up and down to align the axis of the grinding wheel support shaft 4 that holds the support shaft side grinding wheel holder 6A and the axis of the replacement grinding wheel 5. Move the grinding wheel receiver 2 toward the grinding wheel support shaft 4 side and bring the support shaft side grinding wheel holder 6A and the replacement grinding wheel 5 into close contact. Advance the grinding wheel holder detaching mechanism 3 and bring the plate-side grinding wheel holder 6B fixed to the disc-shaped plate 3A into close contact with the replacement grinding wheel 5. Then, fasten the grinding wheel holders 6 together to clamp and fix the replacement grinding wheel 5. 【0024】 Also, a method for grinding a rolling roll according to another embodiment is a method for grinding a rolling roll with a grinding wheel of a grinding machine, which includes the above grinding wheel assembling method in the grinding wheel replacement operation process. Furthermore, it has an operation of removing the grinding wheel with a holder determined to be necessary to be replaced from the rolling roll grinding machine, and an operation of attaching the assembled grinding wheel with a holder for replacement to the grinding machine. During the grinding of the rolling roll, noise and vibration can be measured online, or the surface of the grinding wheel and the remaining thickness of the grinding wheel can be measured offline to serve as the criterion for discarding the grinding wheel. 【0025】 By applying the grinding wheel assembly method according to this embodiment, the disassembly and assembly time of the holder-equipped grinding wheel was reduced by approximately 32% compared to conventional methods. Furthermore, the work required was reduced from two people to one person. In addition, since grinding wheels are replaced 24 times per year during the grinding operation of rolling mill rolls, the application of this embodiment improved the work efficiency of the grinding operation of rolling mill rolls by 0.2%. [Industrial applicability] 【0026】 The grinding wheel assembly apparatus, grinding wheel assembly method, and rolling roll polishing method according to the present invention are industrially useful because they allow for safe disassembly and assembly of grinding wheels and improve the work efficiency of rolling roll polishing operations. [Explanation of symbols] 【0027】 1 base 1A Frame 1B Base Plate 1C Rail 1D Handle 1E (fixed) wheels 1F (flexible) wheels 2. Grinding wheel holder 2A Grinding wheel holder plate 2B Grinding Wheel Lifter 2C ten thousand sticks 2D Flange Groove Wheel 3. Grinding wheel holder attachment / detachment mechanism 3A Grinding wheel holder support member (plate) 3B Forward / Reverse Handle 3C shaft 3D struts 3E Screw 3F Bearing 3G Fixed Pin 4. Grinding wheel support shaft 4A Tapered Shank 4B Rotating Table 5 Sharpening stones 6 (Grinding Wheel) Holder 6A (Support shaft side) (Grinding wheel) holder 6B (Plate side) (Grinding wheel) holder 7 (for fixing) bolts 10. Grinding wheel assembly device

Claims

[Claim 1] A grinding wheel assembly device for disassembling and reassembling a holder-equipped grinding wheel, which is composed of a grinding wheel made of an annular disc and a pair of grinding wheel holders that hold the grinding wheel from both sides in a coaxial arrangement, A base on which each part of the grinding wheel assembly device is installed, A grinding wheel holder is installed to hold the grinding wheel with the holder while maintaining a position in which the axial direction of the grinding wheel is horizontal, and is movable in the vertical direction and in the axial direction of the grinding wheel. A grinding wheel support shaft for detachably supporting one of the aforementioned grinding wheel holders, The other end of the grinding wheel holder is fixed to the grinding wheel on the side facing the grinding wheel support shaft, and the grinding wheel holder attachment / detachment mechanism is installed so as to be able to move back and forth in the axial direction of the grinding wheel. Equipped with, The aforementioned grinding wheel holder attachment / detachment mechanism is, A grinding wheel holder support member for fixing the other end of the grinding wheel holder, A shaft is coaxially positioned with the grinding wheel support shaft, supports the grinding wheel holder support member, and is installed to be able to move back and forth in the axial direction of the grinding wheel. It has, The grinding wheel holder support member is rotatably supported with respect to the shaft, A grinding wheel assembly device having a fixing mechanism that allows the grinding wheel holder support member to rotate in sync with the shaft. [Claim 2] Using the grinding wheel assembly apparatus described in claim 1, The process involves placing the grinding wheel with holder, removed from the grinding machine, onto the grinding wheel support of the grinding wheel assembly device, The process involves moving the grinding wheel support base up and down to align the axis of the grinding wheel holder with the axis of the grinding wheel support shaft, moving the grinding wheel support base towards the grinding wheel support shaft, and inserting the grinding wheel support shaft into one side of the grinding wheel holder for replacement. The grinding wheel holder attachment / detachment mechanism of the grinding wheel assembly device is advanced toward the other side of the grinding wheel holder, and the grinding wheel holder support member is fastened to the other side of the grinding wheel holder. The process involves fixing the grinding wheel holder support member, which is rotatably supported by the shaft, so that it rotates in sync with the shaft, The process involves releasing the fixing of the grinding wheel holders together, retracting the grinding wheel holder attachment / detachment mechanism, and removing the grinding wheel holder from the grinding wheel. The grinding wheel support is moved away from the grinding wheel support shaft, the grinding wheel and the grinding wheel holder are separated, and the grinding wheel is removed from the grinding wheel support; The process involves placing a replacement grinding wheel on the grinding wheel support, moving the grinding wheel support up and down to align the axis of the grinding wheel support shaft that holds one of the grinding wheel holders with the axis of the replacement grinding wheel, moving the grinding wheel support towards the grinding wheel support shaft to bring one of the grinding wheel holders and the replacement grinding wheel into close contact, advancing the grinding wheel holder attachment / detachment mechanism to bring the other end of the grinding wheel holder, which is fixed to the grinding wheel holder support member, into close contact with the replacement grinding wheel, and clamping and fixing the replacement grinding wheel between the grinding wheel holders. A method for assembling grinding wheels, including the assembly method. [Claim 3] A method for polishing rolling rolls, in which the rolling rolls are polished with a grinding wheel of a polishing machine, The grinding wheel assembly method described in claim 2 is included in the grinding wheel replacement work process, moreover, The process involves removing the grinding wheel with holder that has been determined to need replacement from the rolling mill's grinding machine, and The process involves attaching the assembled replacement grinding wheel with holder to the grinding machine, A method for polishing rolling mill rolls, comprising the following:

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