TWI769062B - Method for measuring abrasion of roll pass - Google Patents

Abstract

A method for measuring abrasion of a roll pass includes the following steps. A linear track is disposed on opposite sides of a roll, and the roll has plural roll passes, and a laser displacement meter is installed on the linear track. The laser displacement meter is moved along the linear track so as to obtain an unrolled profile of each roll pass of the unrolled roll. The laser displacement meter is moved along the linear track so as to obtain a rolled profile of each roll pass of the rolled roll. The amount of abrasion of each roll pass is obtained by comparing the unrolled profile and the rolled profile. Moreover, the abrasion data of each roll pass can be applied to the program-controlled computer system of a bar mill, and various roll management functions can be developed.

Description

Method for measuring roll groove wear

The present invention relates to a method for measuring the wear of a roll groove, and in particular to a technology for measuring the wear of a roll groove and an application method thereof.

The rolls of the current bar factory production line lack effective measurement equipment. The solution to the adjustment of the roll gap and the accidental rolling problem mainly relies on the experience of the senior operating colleagues on site, and lacks specific quantitative data as a judgment. Based on this, there are considerable risks and uncertainties regarding the inheritance of rolling technology and the quality stability of the overall rolled products.

There are some conventional measurement techniques for the wear measurement of flat rolling rolls, but the wear measurement of rolls with grooves is not as common as flat rolls, and the conventional rolls with grooves Wear measurement has its key difficulties, so it is expected to develop a non-contact measurement method that can quickly and accurately know the wear depth of each roll groove.

The purpose of the present invention is to provide a method for measuring the wear of roller grooves, which includes: bridging linear slide rails on opposite sides of the roller, wherein the roller has a plurality of roller grooves, and the linear slide rail is provided with a laser displacement meter; The laser displacement gauge is moved along the linear slide to obtain the unrolled profile of each roll groove of the uncalendered roll; the laser displacement gauge is moved along the linear slide to obtain each of the rolled rolls The rolled profile of the roll groove; and the unrolled profile and the rolled profile of each roll groove are compared to obtain the roll groove wear amount of each roll groove.

In some embodiments, the method for measuring the wear of the roll groove further comprises: moving the laser probe of the laser displacement meter along the linear sliding rail from the driving side to the working side of the unrolled roll to obtain the unrolled roll. First profile of each roll groove of the calendered roll; moving the laser probe along a linear slide from the working side of the uncracked roll back to the drive side to obtain each roll of the uncracked roll second profile of the groove; averaging the first profile with the second profile to obtain the unrolled profile of each roll groove of the unrolled roll; run the laser probe along the linear slide from the rolled roll The driving side of the calendered roll is moved to the working side to obtain the third profile of each roll groove of the calendered roll; the laser probe is moved along the linear slide from the working side of the calendered roll back to the driving side, to obtain a fourth profile of each roll groove of the calendered roll; and averaging the third and fourth profiles to obtain a rolled profile of each roll groove of the calendered roll.

In some embodiments, the above-mentioned roll groove wear amount is the difference between the lowest point of the unrolled profile and the lowest point of the rolled profile.

In some embodiments, the method for measuring wear of the roll groove further includes: obtaining deformation resistance values corresponding to a plurality of steel grades at a plurality of rolling temperatures, wherein the plurality of steel grades include a first steel grade and a second steel grade, The first steel grade is the softest steel grade among the plurality of steel grades; and the deformation resistance value corresponding to the first steel grade at one of the plurality of rolling temperatures is used as a reference value, and the second steel grade is obtained in the The relative weight value of the deformation resistance value corresponding to the one of the plurality of rolling temperatures.

In some embodiments, the above steel types include: low carbon steel, medium carbon steel, high carbon steel, medium and low carbon alloy steel, high carbon alloy steel, sulfur-containing free-cutting steel, and welding steel.

In some embodiments, the aforementioned rolling temperatures include: 850, 900, 950, 1000, 1050, 1100, 1150 degrees Celsius (°C).

In some embodiments, the above-mentioned method for measuring roll groove wear further comprises: recording a first rolling count of a plurality of first steel billets passing through one of the plurality of roll grooves of the roll, wherein the first steel billet The steel grade of the blank is the first steel grade; record the second rolling count of a plurality of second steel blanks passing through one of the plurality of roll grooves of the roll, wherein the steel grade of the second steel blank is the second steel grade; obtain The first cumulative weight value and the second cumulative weight value, wherein the first cumulative weight value is the first rolling count, and the second cumulative weight value is the second rolling count multiplied by the relative weight value; to obtain the total weight value, The total weight value is the first cumulative weight value plus the second cumulative weight value; after dividing the wear amount of the roller groove of the plurality of roller grooves by the total weight value, and then multiplying by the first cumulative weight value, Divide by the first rolling count to obtain the estimated first wear amount of each first billet rolling; after dividing the wear amount of the roll groove among the plurality of roll grooves by the total weight value , multiplied by the second cumulative weight value, and then divided by the second rolling count to obtain the second estimated wear amount of each second billet rolling; and establish the multiple steel grades at different rolling temperatures A weight value conversion table within the range is used to indirectly quantify the corresponding relationship between the wear amount of each roll groove and the plurality of rolling temperatures.

In some embodiments, the above-mentioned method for measuring the wear of the roll groove further comprises: establishing the wear history of the roll based on the wear amount of the roll groove of each roll groove of the roll, the number of rolled counts and the tonnage of steel passed; The display screen shows the groove wear amount for each groove of the roll.

In some embodiments, the above-mentioned method for measuring roll groove wear further comprises: adjusting the roll gap of one of the plurality of roll grooves of the roll according to the roll groove wear amount of the one of the plurality of roll grooves of the roll ; And according to the wear history of the roll to judge the roll change cycle of the roll.

In some embodiments, the method for measuring the wear of the roll groove further includes: using the wear history of the roll as a reference for re-turning the roll.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

Embodiments of the present invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable concepts that can be embodied in a wide variety of specific contexts. The discussed and disclosed embodiments are for illustration only, and are not intended to limit the scope of the present invention. The terms "first", "second", .

FIG. 1 is a flow chart of a method for measuring roll groove wear according to an embodiment of the present invention. 2 is a schematic diagram of a measurement system for roll groove wear according to an embodiment of the present invention. In step S1 of FIG. 1 , the linear slide rails 140 are bridged on opposite sides of the roll 120 , wherein the linear slide rails 140 are provided with laser displacement gauges 160 . Specifically, a spanning jig 180 is erected on the positions of the roll surfaces on opposite sides (the driving side DS and the working side WS) of the roll 120, and a linear sliding rail 140 is erected on the spanning jig 180 to displace the laser The gauges 160 can slide back and forth along the linear slides 140 over the roll face positions on opposite sides of the roll 120 . In the example shown in FIG. 2 , the plurality of roll grooves 122 of the roll 120 are 10-groove oval holes, that is, the number of roll grooves 122 is 10, but this is only an example, and the present invention is not limited thereto.

In step S2 of FIG. 1 , the laser displacement gauge 160 is moved along the linear slide rail 140 to obtain the unrolled profile of each roll groove 122 of the unrolled roll 120 . In the embodiment disclosed in the present invention, the details of step S2 are as follows: (1) The laser probe 162 of the laser displacement meter 160 is moved along the linear slide rail 140 from the unrolled roller 120 by the linear slide rail 140 . The driving side DS moves to the working side WS to obtain the first contour of each roll groove 122 of the unrolled roll 120; (2) the laser probe 162 of the laser displacement meter 160 is moved along the The linear slide 140 is moved from the working side WS of the unrolled roll 120 back to the drive side DS to obtain the second profile of each roll groove 122 of the unrolled roll 120; (3) the first profile Averaged with the second profile to obtain the unrolled profile of each roll groove 122 of the unrolled roll 120 .

It is worth mentioning that if the difference between the first contour and the second contour is too large, it is determined that the measurement result of step S2 is incorrect, and step S2 is performed again after adjustment and re-installation.

In other words, the present invention uses the linear slide rail 140 to make the laser probe 162 of the laser displacement meter 160 move back and forth along the linear slide rail 140 from the working side WS to the driving side DS to obtain the continuous profile of each roller groove 122 Wire. Specifically, after the laser probe 162 of the laser displacement meter 160 emits laser light to scan the entire surface of the roller groove 122, the distance value between the laser probe 162 and the object to be measured (ie, the roller surface of the roller groove 122) is recorded ( It should be noted that the roller surface of the roller groove 122 should be cleaned first to avoid measurement errors). The continuous measurement points can be connected to form a complete full-section profile of the roller groove 122, so that the contour of the roller groove 122 can be depicted.

In step S3 of FIG. 1 , the laser displacement meter 160 is moved along the linear slide rail 140 to obtain the rolled profile of each roll groove 122 of the rolled roll 120 . In the embodiment disclosed in the present invention, the details of step S3 are as follows: (1) The laser probe 162 of the laser displacement meter 160 is moved along the linear slide rail 140 from the rolled roller 120 by the linear slide rail 140 . The driving side DS moves to the working side WS to obtain the third contour of each roll groove 122 of the rolled roll 120; (2) the laser probe 162 of the laser displacement meter 160 is moved along the linear slide rail 140. The linear slide 140 is moved from the working side WS of the rolled roll 120 back to the driving side DS to obtain the fourth profile of each roll groove 122 of the rolled roll 120; (3) the third profile Averaged with the fourth profile to obtain the rolled profile of each roll groove 122 of the rolled roll 120 .

It is worth mentioning that if the difference between the third contour and the fourth contour is too large, it is determined that the measurement result of step S3 is incorrect, and step S3 is performed again after adjustment and re-installation.

In step S4 of FIG. 1 , the unrolled profile and the rolled profile of each roll groove 122 are compared to obtain the roll groove wear amount of each roll groove 122 . 3 is a schematic diagram of the unrolled profile P1 , the rolled profile P2 and the roll groove wear amount AB of one of the roll grooves 122 of the roll 120 according to the embodiment of the present invention. Wherein, the Y-axis of the X-Y graph of FIG. 3 is the groove depth, in millimeters (mm), the X-axis is the relative position of the roller groove 122, in %, the leftmost part of the roller groove 122 is 0%, and the The far right is 100%. In the embodiment of the present invention, as shown in FIG. 3, the wear amount AB of the roll groove is the difference between the lowest point of the unrolled profile P1 and the lowest point of the rolled profile P2, and the unit of the roll groove wear amount AB is mm ( mm).

Specifically, as the linear slide rail 140 drives the laser probe 162 of the laser displacement meter 160 to move, every pixel between the leftmost to the rightmost of the roller groove 122 can be obtained. However, due to different rollers The distance from the leftmost to the rightmost roll groove may vary, therefore, the relative position of the X-axis in FIG. 3 presents the contour of the roll groove 122 in percentage units.

In the embodiment of the present invention, the laser displacement meter 160 is used to measure the full-section outline of the roll groove 122 of the roll 120, so as to realize a non-contact measurement method that can quickly and accurately know the wear condition of the roll groove. When the laser probe 162 of the displacement meter 160 moves back and forth with the linear slide rail 140, it can scan the relative distances between the entire surface of the roller groove 122 and the laser probe 162 in real time, and the accuracy can reach ±2 micrometers (μm). The accuracy requirement of the surface wear amount of the groove of the roll is sufficient.

In the embodiment of the present invention, the roll groove of the unrolled roll 120 (ie, the roll 120 before being assembled on the wire) is measured, and the profile of the unrolled roll groove after turning (ie, the unrolled profile) can be obtained. ; Next, measure the roll groove of the rolled roll 120 (ie, the roll 120 after off-line), and obtain the profile of the worn roll groove after rolling (ie, the rolled profile); The difference between the rolling profile and the rolling profile can be used to know the actual wear condition of the roll groove 122 after rolling (roll groove wear amount).

In an embodiment of the present invention, the method for measuring roll groove wear further includes: (1) obtaining deformation resistance values corresponding to a plurality of steel grades at a plurality of rolling temperatures, wherein the plurality of steel grades include the first steel grade and The second steel grade, wherein the first steel grade is the softest steel grade among the plurality of steel grades (eg, mild steel (steel grade code is 1010AK)); The deformation resistance value corresponding to one of them is used as the reference value, and the relative weight value of the deformation resistance value corresponding to the one of the plurality of rolling temperatures of the second steel grade is obtained.

In the embodiment of the present invention, the deformation resistance value (Deformation Resistance) is calculated by the area of strain energy, and the unit is megapascal (MPa). In an embodiment of the present invention, the plurality of steel types include: low carbon steel, medium carbon steel, high carbon steel, medium and low carbon alloy steel, high carbon alloy steel, sulfur-containing free-cutting steel, and welding steel. In an embodiment of the present invention, the plurality of rolling temperatures include: 850, 900, 950, 1000, 1050, 1100, 1150 degrees Celsius (°C).

For example, the first steel grade can be low carbon steel (steel grade code is 1010AK), the deformation resistance value corresponding to the rolling temperature of the first steel grade at 950°C is 93.27 MPa, and the second steel grade can be medium and low carbon alloy steel (The steel grade code is 6140 (40CRV)), the deformation resistance value corresponding to the rolling temperature of the second steel grade at 950°C is 107.57 MPa, then the deformation resistance value corresponding to the rolling temperature of the second steel grade at 950°C The relative weight value is 1.15 (107.57 divided by 93.27).

Specifically, since the small steel billets of various steel grades have different deformation resistance values (that is, the strength value of the steel against rolling deformation flow) at different rolling temperatures, in order to obtain the deformation behavior of the steel during rolling and the wear of the roll groove It is necessary to understand the stress-strain characteristics of each steel grade at different rolling temperatures before calculating the strain energy area (ie, the deformation resistance value) of each steel grade at each rolling temperature, so as to know the The corresponding weight conversion relationship of the deformation resistance value (the deformation resistance value of the softest low carbon steel grade 1010AK is used as the basis for the calculation of the weight value, and the relative weight of the deformation resistance value of the other steel grades is determined according to the deformation resistance value of the other steel grades and its conversion ratio. value). Accordingly, the correspondence between the roll groove wear amount and the rolling temperature was quantified.

In an embodiment of the present invention, the method for measuring roll groove wear further comprises: (1) recording the first rolling count of the plurality of first steel billets passing through one of the plurality of roll grooves of the roll, Wherein the steel grade of the first steel billet is the first steel quality; (2) recording the second rolling count of the second steel billet of the one of the plurality of roll grooves passing through the roll, wherein the second billet has The steel grade is the second steel grade; (3) the first cumulative weight value and the second cumulative weight value are obtained, wherein the first cumulative weight value is the first rolling count, and the second cumulative weight value is the second rolling count multiplied by the Using relative weight values; (4) obtaining a total weight value, wherein the total weight value is the first cumulative weight value plus the second cumulative weight value; (5) the wear amount of the roller groove of the one of the plurality of roller grooves After dividing by the total weight value, multiply by the first accumulated weight value, and then divide by the first rolling count to obtain the first estimated wear amount of rolling of each first steel billet; (6) applying the After dividing the wear amount of the roll groove of one of the plurality of roll grooves by the total weight value, multiply it by the second cumulative weight value, and then divide it by the second rolling count to obtain the rolling count of each second billet. The second estimated wear amount; and (6) according to the above concept, establish a weight value conversion table for multiple steel grades in different rolling temperature ranges, which can indirectly quantify the corresponding relationship between the roll groove wear amount and the rolling temperature.

For example, at a rolling temperature of 950°C, one of the roll grooves 122 of the rolled roll 120 is 81 pieces of first steel billets and 41 pieces of first steel billets in total (ie, the first rolling count is 81 pieces). (that is, the second billet with a second rolling count of 41) has been rolled. The first cumulative weight value is the first rolling count, that is, 81, and the second cumulative weight value is the second rolling count multiplied by the relative weight value, that is, 41*1.15=47.15. The total weight value is the first cumulative weight value of 81 plus the second cumulative weight value of 47.15, that is, the total weight value is 128.15. Divide the wear amount of the roll groove (for example, 0.812351277 mm) by the total weight value (for example, 128.15), multiply it by the first cumulative weight value (for example, 81), and divide it by the first rolling count (for example, 81) ), to obtain the estimated first wear amount of each first billet rolling, that is, 0.00634 mm. Divide the groove wear amount (for example, 0.812351277 mm) by the total weight value (for example, 128.15), multiply it by the second cumulative weight value (for example, 47.15), and divide it by the second rolling count (for example, 41). ), to obtain the second estimated amount of wear for each second billet rolling, that is, 0.00729 mm.

Specifically, the present invention records the steel grades (such as the first steel billet and the second steel billet) passing through the roll groove within a specified time and their corresponding counts (such as the first rolling count and the second rolling count), The cumulative weight value (such as the first cumulative weight value and the second cumulative weight value) and the actual wear amount (that is, the wear amount of the roll groove in step S4) can be converted to obtain the estimated wear amount of each billet rolling (for example, the first Wear estimation or second wear estimation), and then establish a large wear database for different rolls in each rolling area, and at the same time solve the problem that the roll groove wear is difficult to accurately measure.

In an embodiment of the present invention, the method for measuring the wear of the roll groove further comprises: (1) establishing the wear history of the roll based on the wear amount of the roll groove, the number of rolled counts and the number of passed steel tonnage of each roll groove of the roll; (2) Display the wear history of the roll on the display screen of the program-controlled computer (for example, display the roll groove wear amount of each roll groove of the roll on the display screen of the program-controlled computer (also called cumulative wear amount)); (3) According to the roll Adjust the roll gap of one of the roll grooves according to the wear amount of one of the roll grooves of the roll. For example, the larger the wear amount of the roll groove, the smaller the roll gap of the roll; (4) According to the wear of the roll History to judge the roll changing cycle of the rolls. For example, if the wear of the roll groove exceeds a preset wear threshold, the rolls will be replaced. For example, if the number of rolled counts exceeds a preset threshold of rolled counts, the rolls will be replaced. For a new roll groove, for example, if the passing steel tonnage exceeds a preset steel passing tonnage threshold, a new roll groove is used; and (5) the wear history of the roll is used as a reference for re-turning the roll.

Specifically, the cumulative wear amount of the roll is displayed on the display screen of the program-controlled computer, which can be used as a reference for on-site personnel to adjust the roll gap. In this way, not only can the size of the steel be accurately and quickly controlled within the tolerance range, but also the shift output and product qualification rate of the wire and plate elements can be improved, so as to improve the surface quality of the finished rolled products and reduce the incidence of dimensional inconsistencies and surface defects. , has a positive effect on product appearance and surface quality.

In addition, based on the wear history of the rolls, it is possible to realize and/or further develop the intelligent management functions and related application functions of various rolls of the program-controlled computer, and establish a database of the counts and tons of rolls and passing steel billets, for example, the roughness can be automatically accumulated. The relevant data of the rolled small billets of each group of rolls in the rolling, intermediate rolling and pre-finishing mills can be displayed on the display screen of the program-controlled computer in real time. The relevant information of the rolls (such as wear history) can be used as a guide for the on-site personnel to adjust the roll gap. , judging the roll change cycle, and the reference basis for re-turning of the roll in the roll workshop, which helps to improve the work efficiency of the field personnel. That is to say, the wear data of the roll groove can be applied to the program-controlled computer system of the bar workshop to develop various roll management functions.

In view of the above, the present invention proposes a method for measuring the wear of a roll groove (or a measurement technology for the wear of a roll groove and an application method thereof), which is a non-contact method and can quickly and accurately know the wear depth of each roll groove. The measurement method can provide specific quantitative data as the judgment basis for on-site personnel, and improve the quality stability of rolled products.

The foregoing has outlined features of several embodiments so that those skilled in the art may better understand aspects of the invention. Those skilled in the art will appreciate that they may readily use the present invention as a basis for designing or modifying other processes and structures, thereby achieving the same objectives and/or achieving the same advantages as the embodiments described herein . Those skilled in the art should also understand that these equivalent constructions do not depart from the spirit and scope of the present invention, and they can make various changes, substitutions and alterations without departing from the spirit and scope of the present invention.

120: Roller 122: Roller groove 140: Linear slide 160: Laser displacement meter 162: Laser Probe 180: Jumper Fixture AB: Roll groove wear DS: drive side P1: Unrolled profile P2: Contour after rolling S1, S2, S3, S4: Steps WS: Work side

A better understanding of aspects of the present invention can be obtained from the following detailed description taken in conjunction with the accompanying drawings. It should be noted that, according to standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or decreased in order to clarify the discussion. [ Fig. 1 ] is a flowchart of a method for measuring wear of a roll groove according to an embodiment of the present invention. [FIG. 2] It is a schematic diagram of a measurement system for roll groove wear according to an embodiment of the present invention. [ Fig. 3 ] It is a schematic diagram of the unrolled profile, the rolled profile and the wear amount of the roll groove of one of the roll grooves of the roll according to the embodiment of the present invention.

S1, S2, S3, S4: Steps

Claims (9)

A method for measuring wear of roller grooves, comprising: bridging a linear slide rail on opposite sides of a roller, wherein the roller has a plurality of roller grooves, wherein a laser displacement meter is set on the linear slide rail; moving the laser displacement gauge along the linear slide to obtain an unrolled profile of each of the grooves of the unrolled roll; moving the laser displacement gauge along the linear slide to obtain a rolled profile of each of the roll grooves of the roll after rolling; and comparing the unrolled profile and the rolled profile of each of the roll grooves to obtain a rolled profile of each of the roll grooves Roll groove wear, wherein the measuring method further comprises: moving a laser probe of the laser displacement meter along the linear slide from a driving side of the unrolled roll to a working side, so as to obtaining a first profile of each of the grooves of the unrolled roll; moving the laser probe along the linear slide from the working side of the unrolled roll back to the drive side, to obtain a second profile of each of the roll grooves of the unrolled roll; average the first profile and the second profile to obtain each of the roll grooves of the unrolled roll moving the laser probe along the linear slide from the drive side to the work side of the calendered roll to obtain each of the rolls of the calendered roll a third profile of the slot; move the laser probe along the linear slide from the working side of the calendered roll back to the drive side to obtain each of the calendered rolls a fourth profile of the roll groove; and The third profile and the fourth profile are averaged to obtain the rolled profile of each of the grooves of the roll after rolling. The measurement method according to claim 1, wherein the roll groove wear amount is the difference between the lowest point of the unrolled profile and the lowest point of the rolled profile. The measurement method according to claim 1, further comprising: obtaining a deformation resistance value corresponding to a plurality of steel grades at a plurality of rolling temperatures, wherein the steel grades include a first steel grade and a second steel grade, wherein the steel grades The first steel grade is the softest steel grade among the steel grades; and the deformation resistance value corresponding to the first steel grade at one of the rolling temperatures is used as a reference value to obtain the second steel grade at the rolling temperatures. A relative weight value of the deformation resistance value corresponding to the one of the extension temperatures. The measurement method according to claim 3, wherein the steel types include: low carbon steel, medium carbon steel, high carbon steel, medium and low carbon alloy steel, high carbon alloy steel, sulfur-containing free-cutting steel, and welded steel. The measurement method according to claim 3, wherein the rolling temperatures include: 850, 900, 950, 1000, 1050, 1100, 1150 degrees Celsius (°C). The measurement method as described in claim 3, further comprising: Record the first rolling count of one of the plurality of first billets passing through one of the roll grooves of the roll, wherein the steel grade of the first billets is the first steel grade; record the pass through the roll obtaining a second rolling count of the plurality of second steel billets in the one of the roll grooves, wherein the steel grade of the second steel billets is the second steel grade; obtaining a first cumulative weight value and a second cumulative weight value weight value, wherein the first cumulative weight value is the first rolling count, wherein the second cumulative weight value is the second rolling count multiplied by the relative weight value; obtain a total weight value, wherein the total The weight value is the first cumulative weight value plus the second cumulative weight value; the roll groove wear amount of the one of the roll grooves is divided by the total weight value, and then multiplied by the first cumulative weight value , and then divide by the first rolling count to obtain a first estimated amount of wear of each of the first billets; divide the wear amount of the roll groove among the roll grooves by After the total weight value is multiplied by the second accumulated weight value, and then divided by the second rolling count, to obtain a second estimated wear amount of rolling of each of the second billets; and establishing A weight value conversion table of the steel grades in different rolling temperature ranges to indirectly quantify the corresponding relationship between the roll groove wear amount of each of the roll grooves and the rolling temperatures. The measuring method according to claim 1, further comprising: using the wear amount of the grooves of each of the grooves of the roll, a number of rolled counts A wear history of the roll is established with a steel tonnage; and a display screen of a program-controlled computer displays the roll groove wear amount of each of the roll grooves of the roll. The measuring method according to claim 7, further comprising: adjusting a roll gap of the one of the roll grooves of the roll according to the wear amount of the roll groove of the one of the roll grooves; and A roll change cycle of the roll is judged by the wear history of the roll. The measuring method according to claim 7, further comprising: using the wear history of the roll as a reference for re-turning the roll.

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