Method for prolonging service life of ribbed roller

Abstract

The embodiment of the invention provides a method for prolonging the service life of a ribbed roller. The method comprises the steps that firstly, a roller ring to be subjected to rib milling is subjected to diameter and hole pattern machining on a special roller ring grinding machine; 2, the roll collar with the machined hole pattern is installed on a special thread milling machine, and rib groove machining is conducted; 3, after table alignment correction is conducted on the roll collar on a special thread milling machine, the machining position of a first rib groove is found according to a machining program; fourthly, after the end face of the first rib groove machining position is marked, rib grooves start to be machined, and a grinding machining cycle is completed; (5) the machined roll collar is off line after being normally used for one period on line; and after offline, according to the number of transverse ribs machined in the previous grinding machining period and the groove distance, a grinding layer needing to be ground is calculated, and the surfaces of the steel bar grooves and the rib line grooves are milled. According to the method, the time between two times of surface treatment of smoothing all the rib grooves and then milling again is effectively prolonged, and the service life of the ribbed roller is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of hot-rolled ribbed steel bar manufacturing, in particular to a method for extending the service life of a ribbed roller. Background Art

[0002] Rebar is the common name for hot-rolled ribbed steel bars, also known as rebar with ribbed surfaces. Ribbed steel bars, due to their ribs, have a strong bond with concrete, thus better withstanding external forces. Ribbed steel bars are widely used in various building structures, particularly large, heavy, lightweight, thin-walled, and high-rise structures.

[0003] The production of hot rolled ribbed steel bars is completed by rolling with ribbed rollers. Figure 1 As shown, the ribless steel bar 1 in the high temperature molten state is rolled by two ribbed rollers 2. With the help of the rib grooves 22 on the ribbed rollers 2, ribs 11 are pressed on the steel bar 1 to form a hot rolled ribbed steel bar. Figure 2 As shown, a steel bar groove 21 is provided on the surface of the ribbed roller 2 to accommodate the steel bar body, and a rib groove 22 is provided on the bottom surface of the steel bar groove 21 to press ribs on the steel bar.

[0004] To ensure that the ribbed steel bars maintain a certain strength even at high temperatures, ribbed rollers are typically made of hard tungsten carbide, a relatively expensive material. Despite this, as the ribbed rollers continuously roll the steel bars at high temperatures, a fatigue layer forms on the steel bar grooves and rib grooves. When fatigue reaches a certain level, it softens and deforms, even affecting the accurate compression of the ribs. At this point, the ribbed roller surface must be treated.

[0005] like Figure 3 As shown, the commonly used surface treatment method is to grind (mill) all the rib grooves 22 in the steel bar groove 21 and then re-mill the rib grooves on a thread milling machine. In order to grind the fatigue layer cleanly, the grinding amount is about 3mm. On the other hand, in order to ensure that the steel bar groove can accurately accommodate the steel bar, such as Figure 3 As shown, the steel bar groove 21 itself and the ribbed roller body 23 on both sides of the steel bar groove 21 are also ground. In this way, from the body to the steel bar groove and then to the rib groove, all are ground. Therefore, the number of times the ribbed roller can undergo this surface treatment is limited. In this case, the number of times the ribbed roller can undergo this surface treatment also determines the service life of the ribbed roller.

[0006] The present invention seeks to provide a method for extending the service life of ribbed rolls. Summary of the Invention

[0007] The present invention seeks to provide a method for extending the service life of ribbed rolls.

[0008] An embodiment of the present invention provides a method for extending the service life of a ribbed roll, comprising: step 1: processing the diameter and hole profile of a roll ring to be milled with ribs on a dedicated roll ring grinder; step 2: mounting the roll ring with the processed hole profile on a dedicated thread milling machine to process the rib grooves; step 3: after calibrating the roll ring on the dedicated thread milling machine, finding the processing position of the first rib groove according to the processing program; step 4: marking the end face of the first rib groove processing position and starting to process the rib grooves to complete a grinding process cycle; step 5: the processed roll ring is put on line for one cycle of normal use and then taken off line; after taking off line, the grinding layer to be ground is calculated based on the number of transverse ribs and the groove spacing processed in the previous grinding process cycle, and the surfaces of the steel bar grooves and the rib grooves are milled to ensure the removal of the fatigue layer, while ensuring that the size of the steel bar grooves, the size of the rib grooves, and the spacing between the rib grooves are all within an allowable range.

[0009] Furthermore, the method for extending the service life of the ribbed roller further includes: Step 6: Repeat the process of step 5. After milling the steel bar groove and rib groove several times, the roller body on both sides of the steel bar groove is also milled appropriately.

[0010] Furthermore, the method for extending the service life of the ribbed roller further includes: Step 7: When the number of rib grooves in the steel bar groove is less than the number of rib grooves in the first grinding cycle, all rib grooves are ground clean and return to step 1 to perform the working cycle until the roller ring is finally scrapped.

[0011] The method for extending the service life of the ribbed roller provided by the present invention effectively extends the time between two surface treatments of smoothing all the rib grooves and then re-milling, thereby effectively extending the service life of the ribbed roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Shown is a schematic diagram of ribbed rollers rolling ribbed steel bars.

[0013] Figure 2 Shown is a schematic structural diagram of a ribbed roller.

[0014] Figure 3 Shown is a schematic diagram of surface treatment of a ribbed roll in the prior art.

[0015] Figure 4 Shown is a schematic diagram of surface treatment of a ribbed roll in an embodiment of the present invention.

[0016] Reference numerals: 1: Steel bar; 11: Rib; 2: Ribbed roller; 21: Steel bar groove; 22: Rib groove; 23: Main body; 3: Grinding layer. DETAILED DESCRIPTION

[0017] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0018] The embodiment of the present invention Figure 3 The surface treatment method shown in the figure is improved. In use, based on the experience and the time of use, the fatigue layer is ground when a certain thickness of fatigue layer (about 0.8-1mm) appears. Figure 4 As shown, the fatigue layer on the steel bar groove 21 and rib groove 22 is ground to a thickness of 0.8-1 mm. After the fatigue layer is ground, the steel bar groove 21 and rib groove 22 can continue to be used for rolling rebar within a certain tolerance, so there is no need to grind the main body on both sides of the steel bar groove 21. Of course, after the steel bar groove 21 and rib groove 22 have been ground a certain number of times, it is necessary to grind the main body on both sides of the steel bar groove 21.

[0019] However, since the size of the rib grooves 22 has changed, the change in a single rib groove 22 is minimal. However, multiple rib grooves 22 are distributed within the rebar groove 21 of the ribbed roller 2, and the spacing between adjacent rib grooves 22 must also meet the requirements of ribbed hot-rolled rebar products. Therefore, when grinding the rib grooves 22, the issue of the variation in spacing between adjacent rib grooves 22 must also be considered. Variation in spacing between adjacent rib grooves 22 is acceptable within a certain error range. To facilitate control of this spacing variation during milling, the first rib groove position of the previous milling is found and, using this first rib groove position as the starting point, each rib groove can be processed individually in a targeted manner.

[0020] In addition, in the existing rolling roller, after the rib groove 22 is milled into the steel bar groove 21 for the first time, the steel bar groove 21 is not filled with the rib groove 22, and there are still some blank areas at the end, thereby providing some space for adjusting the spacing between the rib grooves 22, because new rib grooves can be milled in the blank areas.

[0021] In the prior art, after a fatigue layer is generated on the roll, as the fatigue layer accumulates and deforms, Figure 3As shown, the rib grooves 22 are completely milled and smoothed, and then the rib grooves 22 are re-milled. In this embodiment of the present invention, as soon as a thin fatigue layer (0.8-1 mm) is formed on the roller, the fatigue layer is milled away. At this point, the rib grooves 22 can continue to be used, thereby avoiding the effects of accumulated deformation of the fatigue layer and extending the service life of the ribbed roller. Of course, after several milling cycles, the size of the rib grooves has deviated significantly from the standard specifications, and the existing method of milling and smoothing the rib grooves 22 and re-milling is necessary. However, according to the method of the embodiment of the present invention, the service life between two milling and smoothing cycles is greatly extended. Because the existing method completely smoothes the fatigue layer as soon as it is formed, the method of the embodiment of the present invention only mills the fatigue layer on the surface.

[0022] If combined with the first milling of the roller ring, the processing method of the embodiment of the present invention includes the following contents: Step 1: Process the diameter and hole shape of the roller ring to be milled on a dedicated roller ring grinder; Step 2: Install the roller ring with processed hole shape on a special thread milling machine to process the rib groove; Step 3: After calibrating the roller ring on a dedicated thread milling machine, find the processing position of the first rib groove according to the processing procedure; Step 4: After marking the end face of the first rib groove processing position, start processing the rib groove and complete a grinding cycle; Step 5: The processed roller ring is put into normal use for one cycle before being taken off the line. After taking off the line, the grinding layer to be ground (about 0.8-1mm) is calculated based on the number of cross ribs and the groove spacing processed in the previous grinding cycle. The surface of the steel bar groove and rib groove is milled to ensure the removal of the fatigue layer. At the same time, the size of the steel bar groove, the size of the rib groove, and the spacing between the rib grooves are within the allowable range. Step 6: Repeat the process of step 5. After milling the steel bar groove and rib groove several times, mill the roller body on both sides of the steel bar groove appropriately. Step 7: When the number of rib grooves in the steel bar groove is less than the number of rib grooves in the first grinding cycle, all rib grooves are ground clean and return to step 1 to perform the working cycle until the roller ring is finally scrapped.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] The present invention has been described with reference to the above embodiments. However, the above embodiments are merely exemplary embodiments of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and improvements that do not depart from the spirit and scope of the present invention are intended to be protected by the present invention.

Claims

1. A method for extending the service life of a ribbed roller, comprising: Step 1: Process the diameter and hole shape of the roller ring to be milled on a dedicated roller ring grinder; Step 2: Install the roller ring with processed hole shape on a special thread milling machine to process the rib groove; Step 3: After calibrating the roller ring on a dedicated thread milling machine, find the processing position of the first rib groove according to the processing procedure; Step 4: After marking the end face of the first rib groove processing position, start processing the rib groove and complete a grinding cycle; Characterized in that, the method for extending the service life of the ribbed roller further comprises: Step 5: The processed roller ring is put into normal use for one cycle before being taken off the line. After taking off the line, the grinding layer to be ground is calculated based on the number of cross ribs and the groove spacing processed in the previous grinding cycle. The surface of the steel bar groove and rib groove is milled to ensure the removal of the fatigue layer. At the same time, the size of the steel bar groove, the size of the rib groove, and the spacing between the rib grooves are within the allowable range.

2. The method for extending the service life of a ribbed roll according to claim 1, characterized in that: Also includes: Step 6: Repeat the process of step 5. After milling the steel bar groove and rib groove several times, the roller body on both sides of the steel bar groove is also milled appropriately.

3. The method for extending the service life of a ribbed roll according to claim 2, characterized in that: Also includes: Step 7: When the number of rib grooves in the steel bar groove is less than the number of rib grooves in the first grinding cycle, all rib grooves are ground clean and return to step 1 to perform the working cycle until the roller ring is finally scrapped.

4. The method for extending the service life of a ribbed roll according to claim 1, characterized in that: In step 5, the grinding layer to be ground is about 0.8-1 mm.

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