Roller gap measurement system in roll pressing process and roller gap measurement method using same

Abstract

In a roller gap measurement system and a roller gap measurement method using same, the roller gap measurement system comprises a displacement measurement unit, a gap measurement unit, a storage unit, and a calculation unit. The displacement measurement unit measures the displacement of first and second rollers. The gap measurement unit measures a roller gap between the first and second rollers. The storage unit stores the displacement measurement result and the roller gap measurement result before performing a pressing process. The calculation unit calculates the roller gap in the pressing process on the basis of a displacement measurement result of the first and second rollers measured while performing the pressing process, by using the stored measurement results.

Description

Roller gap measurement system in roll pressing process and roller gap measurement method using the same

[0001] The present invention relates to a roller gap measurement system and a roller gap measurement method using the same in a roll pressing process, and more specifically, to a roller gap measurement system capable of more accurately measuring a roller gap in real time according to roller deformation or rolling unevenness in a roll pressing process among secondary battery electrode manufacturing processes, and a roller gap measurement method using the same.

[0002] As illustrated in Fig. 1a, in a roll pressing device (1) performing a roll pressing process, a material is coated on a substrate provided by a supply roll (2) through a coating unit (3), and then a rolling process is performed by rolling rollers (4, 5) so that the material is pressed to a predetermined thickness and then recovered by a recovery roll (6). This roll pressing process is being used, particularly in the manufacture of secondary battery electrodes, and its scope of use is expanding.

[0003] However, as shown in Fig. 1b, during the process of rolling the material by the rollers (4, 5), the upper roller (4) or the lower roller (5) is deformed due to deformation of the rollers or unevenness of rolling, etc., so that the roller gap (G) varies depending on the position of the roller, and thus the problem of uneven thickness of the material pressed through the rolling process occurs.

[0004] To address the problem of uneven thickness of these materials, a technology for accurately measuring the roller gap (G) during the roll pressing process is first required. Accordingly, Japanese Patent No. 7204613 discloses a technology for directly photographing and measuring the roller gap (G) using a photographing unit, and Korean Patent Publication No. 10-2015-0037182 discloses a technology for measuring the displacement of a rolling roll using displacement sensors to derive the roller gap (G).

[0005] However, to date, the development of technology capable of more accurately measuring the roller gap (G) in real time has been insufficient.

[0006] Accordingly, the technical problem of the present invention is conceived from this point, and the purpose of the present invention is to provide a roller gap measurement system that can more accurately measure the roller gap in real time according to the deformation or rolling unevenness of the roller in the roll pressing process during the secondary battery electrode manufacturing process, thereby performing more uniform rolling of the material.

[0007] In addition, another object of the present invention is to provide a roller gap measuring method using the roller gap measuring system.

[0008] According to one embodiment of the present invention, a roller gap measurement system for realizing the above-described object includes a displacement measurement unit, a gap measurement unit, a storage unit, and a calculation unit. The displacement measurement unit measures the displacement of first and second rollers. The gap measurement unit measures the roller gap between the first and second rollers. The storage unit stores the displacement measurement results and the roller gap measurement results before performing a pressurizing process. The calculation unit performs a pressurizing process using the stored measurement results, and calculates the roller gap in the pressurizing process based on the measured displacement measurement results of the first and second rollers.

[0009] In one embodiment, the displacement measuring unit may include a first measuring unit positioned on the outer surface of the first roller to measure the shape of the first roller, and a second measuring unit positioned on the outer surface of the second roller to measure the shape of the second roller.

[0010] In one embodiment, the first measuring section may be arranged in plurality on the outer surface of the first roller, and the second measuring section may be arranged in plurality on the outer surface of the second roller.

[0011] In one embodiment, each of the first and second measuring units may be a contact or optical displacement measuring device.

[0012] In one embodiment, the gap measuring unit may include an irradiation unit that provides light between the first and second rollers on one side of the first and second rollers, and a sensor unit that senses the irradiated light on the other side of the first and second rollers.

[0013] In one embodiment, the device may further include an external force applying unit that induces deformation of the first and second rollers.

[0014] In one embodiment, the external force application unit is provided on the rotational axis or outer surface of the first and second rollers, and can vary the roller gap.

[0015] In one embodiment, the external force application unit can control the pressurization process by inducing deformation of the first and second rollers based on the roller gap operation result of the operation unit.

[0016] In one embodiment, the gap measuring unit can measure the roller gap by inducing deformation of the first and second rollers before performing the pressurizing process.

[0017] In one embodiment, the storage unit can store a relationship between the displacement and the roller gap based on the displacement measurement result and the roller gap measurement result.

[0018] In one embodiment, the calculation unit can calculate the roller gap in the pressing process by applying the displacement measurement result measured while performing the pressing process to the relationship between the displacement stored in the storage unit and the roller gap.

[0019] In one embodiment, when the displacement measurement result of the first and second rollers at a specific position and a specific rotation angle is D1, the roller gap measurement result between the first and second rollers at the specific position and a specific rotation angle is D2, and the displacement measurement result of the first and second rollers at the specific position and a specific rotation angle while performing the pressing process is D3, the calculation unit,

[0020] Gap=(D3-D1)+D2 Equation (1)

[0021] The roller gap can be calculated in the pressurizing process using the above equation (1).

[0022] In one embodiment, the method further includes a mapping unit that maps the relationship between the displacement and the roller gap into an image, and the calculation unit can calculate the roller gap in the pressing process using the mapped image.

[0023] In one embodiment, the storage unit may store displacements according to the extension direction and rotation angle of each of the first and second rollers as the displacement measurement results, and may store roller gap measurement results according to the extension direction and rotation angle of each of the first and second rollers as the relationship between the displacement and the roller gap by matching them with the displacement measurement results.

[0024] A roller gap measuring method according to one embodiment for realizing another object of the present invention includes a step of measuring displacement of first and second rollers and a roller gap between the first and second rollers before performing a pressurizing process (step S10), a step of storing the displacement measurement result and the roller gap measurement result (step S20), a step of performing a pressurizing process and measuring the displacement of the first and second rollers (step S30), and a step of calculating the roller gap in the pressurizing process based on the displacement measurement result of the first and second rollers measured while performing the pressurizing process using the stored measurement results (step S40).

[0025] In one embodiment, the step S10 may include, before performing the pressurizing process, a step of measuring a displacement according to an extension direction and a rotation angle of each of the first and second rollers, and, before performing the pressurizing process, a step of measuring a roller gap between the first and second rollers.

[0026] In one embodiment, the step S20 may include, before performing the pressurizing process, a step of storing a relationship between the displacement and the roller gap, and a step of mapping the relationship between the stored displacement and the roller gap into an image.

[0027] In one embodiment, the step S40 may include a step of calculating the roller gap in the pressing process using the relationship between the displacement and the roller gap, and a step of monitoring the roller gap in real time in the pressing process based on the roller gap calculation result.

[0028] According to embodiments of the present invention, by measuring the displacement and roller gap of the first and second rollers in advance in the initial state, i.e., before performing the pressurizing process, when performing the actual pressurizing process, only the displacement of the first and second rollers is measured, thereby deriving the roller gap between the first and second rollers. Accordingly, by obtaining real-time roller gap information when performing the actual pressurizing process, feedback control of the roller gap is performed if necessary, so that more uniform and precise pressurization can be performed by maintaining a more uniform roller gap.

[0029] That is, when performing an actual pressurizing process, the limitation of being difficult to measure the roller gap due to the rolling material interposed between the first and second rollers, even though the deformation of the rollers is significantly caused, is overcome, thereby enabling real-time roller gap monitoring in the pressurizing process.

[0030] In particular, the displacement of the first and second rollers is obtained according to the extension direction and rotation angle, and the measured roller gap is matched according to the extension direction and rotation angle and stored in a database or mapped as an image, so that the displacement information of the first and second rollers can be derived for any position and any rotation angle in the pressing process, and if necessary, the three-dimensional shape of the deformed roller can be virtually obtained, so that the deformation state of the roller in the actual pressing process can be obtained in real time and necessary control can be performed.

[0031] At this time, the displacement can be measured by a contact or optical displacement measuring device, and the displacement is obtained by measuring the outer surface of the roller, so that there is no problem of measurement being limited by the supply of the rolling material even during the pressing process, and the limitation of measurement due to interference from peripheral equipment of the pressing device is minimized.

[0032] In addition, when performing the calculation of the roller gap, it is performed through a simple calculation based on the displacement measurement results in the initial state, the gap measurement results, and the displacement measurement results in the pressurization process, so real-time monitoring can be implemented through a simple and quick calculation.

[0033] Fig. 1a is a schematic diagram illustrating a roll pressing process according to a conventional technology, and Fig. 1b is a schematic diagram illustrating a deformation state of the rolling rollers of Fig. 1a.

[0034] Fig. 2 is a schematic diagram illustrating a roller gap measurement system according to one embodiment of the present invention.

[0035] Fig. 3 is a schematic diagram illustrating a rolling roller and a displacement measuring unit in the roller gap measuring system of Fig. 2.

[0036] Fig. 4 is an example of mapping the initial state measurement results measured using the roller gap measurement system of Fig. 2 into an image.

[0037] Figure 5 is a schematic diagram illustrating a state in which a roller gap is monitored in real time using the roller gap measurement system of Figure 2.

[0038] Fig. 6 is a flowchart illustrating a roller gap measurement method using the roller gap measurement system of Fig. 2.

[0039] <Explanation of symbols>

[0040] 100: Roller gap measuring system 200: Rolling roller

[0041] 210: 1st roller 220: 2nd roller

[0042] 300: Displacement measuring unit 310: First measuring unit

[0043] 320: Second measuring section 350: Gap measuring section

[0044] 330: Investigation Department 340: Sensor Department

[0045] 400: Displacement derivation section 450: Gap derivation section

[0046] 500: Storage unit 550: Mapping unit

[0047] 600: Operation section 650: Monitoring section

[0048] The present invention is susceptible to various modifications and takes various forms, and thus embodiments are described in detail herein. However, this is not intended to limit the present invention to a specific disclosed form, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Similar reference numerals have been used to designate similar components throughout the description of each drawing. While terms such as "first," "second," etc. may be used to describe various components, these components should not be limited by these terms.

[0049] The above terms are used solely for the purpose of distinguishing one component from another. The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "consists of" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0050] Hereinafter, with reference to the attached drawings, a preferred embodiment of the present invention will be described in more detail.

[0051] Fig. 2 is a schematic diagram illustrating a roller gap measurement system according to one embodiment of the present invention. Fig. 3 is a schematic diagram illustrating a rolling roller and a displacement measurement unit in the roller gap measurement system of Fig. 2.

[0052] Referring to FIGS. 2 and 3, the roller gap measurement system (hereinafter referred to as the measurement system) (100) according to the present embodiment includes a displacement measurement unit (300), a gap measurement unit (350), a displacement derivation unit (400), a gap derivation unit (450), a storage unit (500), a mapping unit (550), a calculation unit (600), and a monitoring unit (650).

[0053] The displacement measuring unit (300) includes first and second measuring units (310, 320) and is provided on each of the first and second rollers (210, 220) of the rolling roller (200).

[0054] The above rolling roller (200) is a pair of rollers that perform a roll pressing process as illustrated in Fig. 1a, and includes a first roller (210) and a second roller (220). At this time, the first and second rollers (210, 220) are arranged to maintain a predetermined roller gap (G) that is set in advance, and the rolling material is rolled (pressed) while passing between the first and second rollers (210, 220), thereby forming a thickness equal to the predetermined roller gap (G) that is set in advance.

[0055] That is, ideally, the roller gap (G) is formed to the same thickness as the thickness to which the rolled material is to be formed through the roll pressing process (or rolling process), but in the actual rolling process, the roller gap (G) varies due to various reasons such as deformation of the rollers, unevenness of rolling, and unevenness of the material. Furthermore, this variation of the roller gap (G) ultimately varies the final formed thickness of the rolled material, and therefore, it is necessary to minimize the variation of the roller gap (G). That is, by monitoring the variation state of the roller gap (G) in real time, separate control can be performed to uniformly maintain the roller gap (G) at a preset gap, thereby uniformly maintaining the final formed thickness of the rolled material.

[0056] The first and second measuring sections (310, 320) are provided on the outer surfaces of the first and second rollers (210, 220), respectively, to measure the displacement of the first and second rollers (210, 220).

[0057] At this time, measuring the displacement of the first and second rollers (210, 220) may mean measuring the distance (displacement) from the first and second measuring parts (310, 320) to the outer surfaces of the first and second rollers (210, 220), respectively, or alternatively, may mean measuring the amount of change in the distances between the initially set first and second measuring parts (310, 320) and the outer surfaces of the first and second rollers (210, 220).

[0058] The first and second measuring parts (310, 320) are provided on the outer peripheral surfaces of the first and second rollers (210, 220) as described above to measure displacement, so that even if the rolling material passes between the first and second rollers (210, 220) during the actual rolling process, interference in measuring the displacement is minimized, and accurate displacement measurement is possible even during the rolling process.

[0059] In addition, since the positions of the first and second rollers (210, 220) are likely to change substantially along the direction in which the first and second measuring units (310, 320) are positioned in FIG. 2 as the rolling process is performed, it is necessary for the first and second measuring units (310, 320) to be positioned along the thickness direction (Y direction in FIG. 3) of the rolling material transported in accordance with the rolling process, as shown in FIG. 2.

[0060] However, the positions of the first and second measuring sections (310, 320) are not necessarily limited to being aligned with the thickness direction of the rolled material, and may be arranged in a direction having a predetermined inclination angle with respect to the thickness direction of the rolled material. In this case, if arranged with an inclination angle, it is obvious that the displacement between the first and second rollers (210, 220) should be calculated taking the inclination angle into consideration.

[0061] Each of the first and second measuring units (310, 320) may be arranged in multiple numbers at regular intervals along the extension direction (X) of the first and second rollers (210, 220), as illustrated in FIG. 3. Accordingly, displacement information of each of the first and second rollers (210, 220) may be derived along the extension direction (X) of the first and second rollers (210, 220). In addition, the number or the arrangement interval of the first and second measuring units (310, 320) arranged along the extension direction (X) may vary.

[0062] At this time, the first and second measuring units (310, 320) measure displacement information for each rotation angle (θ) at each position along the extension direction (X) when the first and second rollers (210, 220) rotate with the extension direction (X) as the rotation axis.

[0063] As described above, the first measuring unit (310) measures displacement information for each preset rotation angle at a plurality of locations along the extension direction (X) when the first roller (210) rotates. Similarly, the second measuring unit (320) measures displacement information for each preset rotation angle at a plurality of locations along the extension direction (X) when the second roller (220) rotates. At this time, the locations where the first and second measuring units (310, 320) are located along the extension direction (X) must be the same, and similarly, the rotation angles at which the displacement is measured must also be the same for the first and second measuring units (310, 320).

[0064] At this time, each of the first and second measuring units (310, 320) may be, for example, a contact displacement measuring device such as a contact dial gauge, or an optical displacement measuring device such as a laser displacement measuring device, but is not limited thereto, and any measuring device capable of measuring displacement is sufficient.

[0065] Meanwhile, the first and second measuring units (310, 320) can measure the displacement of the first and second rollers (210, 220) in the initial state, i.e., before the pressurizing process is performed, and can also measure the displacement of the first and second rollers (210, 220) during the process of performing the pressurizing process.

[0066] As described above, the displacement measurement result of the first roller (210) measured through the first measuring unit (310) is transmitted to the displacement derivation unit (400), and the displacement derivation unit (400) derives displacement information of the first roller (210) according to the extension direction (X) and rotation angle (θ) of the first roller (210).

[0067] Likewise, the displacement measurement result of the second roller (220) measured through the second measuring unit (320) is also transmitted to the displacement derivation unit (400), and the displacement derivation unit (400) derives displacement information of the second roller (220) according to the extension direction (X) and rotation angle (θ) of the second roller (220).

[0068] Of course, the displacement derivation unit (400) may be omitted, and the results measured by the first and second measuring units (310, 320) may be directly transferred to the storage unit (500) described below, so that displacement information according to the extension direction (X) and rotation angle (θ) may be directly stored.

[0069] Furthermore, as described above, since the displacement measurement is possible not only in the initial state but also in the state in which the pressurization process is performed, the displacement derivation unit (400) can derive displacement information according to the extension direction (X) and rotation angle (θ) of each roller from the displacement measurement result in real time.

[0070] The above gap measuring unit (350) measures the roller gap (G) between the first and second rollers (210, 220) in the initial state, i.e., before the pressurizing process is performed, and includes an investigation unit (330) and a sensor unit (340).

[0071] The above-mentioned irradiation unit (330) is located on one side of the first and second rollers (210, 220) and irradiates a predetermined light between the first and second rollers (210, 220). The light irradiated at this time may be laser light, but is not limited thereto.

[0072] The sensor unit (340) is located on the other side of the first and second rollers (210, 220), senses light received through the gap between the first and second rollers (210, 220), and measures the roller gap (G) through this.

[0073] At this time, the gap measuring unit (350) measures the roller gap (G) between the first and second rollers (210, 220) in the initial state, i.e., before the pressurizing process is performed, and, similarly to the displacement measuring unit (300) described above, must measure the roller gap (G) according to the extension direction (X) and rotation angle (θ).

[0074] Thus, the measurement result of the roller gap (G) measured by the gap measuring unit (350) is provided to the gap derivation unit (450), and the gap derivation unit (450) derives the roller gap (G) between the first and second rollers (210, 220) as roller gap (G) information according to the extension direction (X) and rotation angle (θ) of the roller.

[0075] Of course, the gap derivation unit (450) may be omitted, and the result measured by the gap measurement unit (350) may be directly transmitted to the storage unit (500) described below, so that the roller gap (G) information according to the extension direction (X) and rotation angle (θ) may be directly stored.

[0076] Furthermore, as explained above, since the roller gap (G) information can only be measured in the initial state, the roller gap (G) information is used as a database for deriving the roller gap (G) information in real time.

[0077] In contrast, as described below, a separate external force applying unit capable of inducing deformation of the rollers may be provided on the outer surface or the rotation axis of the first and second rollers (210, 220). In this case, information on the roller gap (G) measured through the gap measuring unit (350) can be obtained in a more diverse manner. That is, by applying an external force to the first and second rollers (210, 220) through the external force applying unit, the roller gap (G) can be varied in a diverse manner, and roller gap (G) information according to the extension direction (X) and rotation angle (θ) that are varied according to the pressure can be obtained.

[0078] Thus, a more diverse database for the roller gap (G) information can be secured, and thus, when calculating the roller gap (G) information in real time in the calculation unit (600) described below, the accuracy of the calculation can be further improved.

[0079] The storage unit (500) stores the displacement measurement results and the roller gap measurement results in the initial state. That is, it stores displacement information according to the extension direction (X) and rotation angle (θ) of the first and second rollers (210, 220) transmitted through the displacement derivation unit (400), and roller gap (G) information according to the extension direction (X) and rotation angle (θ) of the first and second rollers (210, 220) transmitted through the gap derivation unit (450).

[0080] At this time, the storage unit (500) derives and stores the so-called relationship between the displacement and the roller gap based on the displacement measurement result and the gap measurement result. The relationship between the displacement and the roller gap means the result of matching the displacement in the initial state of the first and second rollers (210, 220) with the roller gap (G) in the initial state between the first and second rollers (210, 220) according to the extension direction (X) and the rotation angle (θ).

[0081] That is, the displacement of the first and second rollers (210, 220) and the roller gap between the first and second rollers (210, 220) are stored in a database according to the extension direction (X) and rotation angle (θ) of the roller. Through this, in the initial state, the relationship between the displacement and the roller gap at any position in the extension direction (X) of the roller and in a state where the roller is rotated at any rotation angle is stored. Consequently, since the information on the roller gap (G) between the first and second rollers (210, 220) in the initial state is stored in a database, as the number of displacement measuring units (300) in the extension direction (X) increases and as the rotation angle (θ) is derived in detail, the information on the roller gap (G) can be acquired more precisely.

[0082] Meanwhile, the relationship between the displacement and the roller gap, which is stored in the database in the storage unit (500), can be transmitted to the mapping unit (550) and mapped into an image.

[0083] Fig. 4 is an example of mapping the initial state measurement results measured using the roller gap measurement system of Fig. 2 into an image.

[0084] That is, referring to FIG. 4, the mapping unit (550) can image the measured roller gap (G) by mapping it according to the extension direction (X) of the first and second rollers (210, 220) and the rotation angle (θ) of the first and second rollers (210, 220).

[0085] In addition, although not shown, the mapping unit (550) may also image the measured displacement by mapping it according to the extension direction (X) of the first and second rollers (210, 220) and the rotation angle (θ) of the first and second rollers (210, 220).

[0086] Thus, the imaged roller gap (G) and the imaged displacement can be additionally mapped into a single three-dimensional image, and for a specific rotation angle, the roller gap (G) and the displacement can be mapped into a two-dimensional image.

[0087] That is, by using the database stored in the storage unit (500) regarding the relationship between the displacement and the roller gap, various mapped images can be derived, and the mapped images can be utilized in subsequent calculations of the roller gap (G).

[0088] Furthermore, although not shown, images mapped as described above may be trained through a separate learning unit, and the image learning results may be directly applied to the operation of the roller gap (G) described below.

[0089] That is, when displacement information is input in a real-time pressurizing process while the relationship between displacement and roller gap is imaged and learning is performed, roller gap information matching thereto can be derived, and through this, roller gap information in a real-time pressurizing process can be obtained.

[0090] The above calculation unit (600) performs an actual pressurizing process using the measurement results stored in the storage unit (500) or the mapping unit (550), and calculates the roller gap (G') in the pressurizing process based on the displacement measurement results measured during the actual pressurizing process.

[0091] At this time, the operation unit (600) can receive the displacement measurement results measured while performing the actual pressurization process through the first and second measurement units (310, 320). Of course, if the displacement derivation unit (400) is provided, information stored in a database for each extension direction (X) and rotation angle (θ) can be received through the displacement derivation unit (400).

[0092] As described above, the displacement measuring unit (300) measures the displacement of the first and second rollers (210, 220) in real time during the actual process of performing the work, so the displacement of the first and second rollers (210, 220) measured in this way is databased by extension direction (X) and rotation angle (θ) through the displacement derivation unit (400) and provided to the calculation unit (600).

[0093] Figure 5 is a schematic diagram illustrating a state in which a roller gap is monitored in real time using the roller gap measurement system of Figure 2.

[0094] At this time, with additional reference to FIG. 5, the content of calculating the real-time roller gap in the calculation unit (600) is described as follows.

[0095] That is, the calculation unit (600) uses the displacement measurement result transmitted in real time to calculate the roller gap (G') in real time by using the relationship between the displacement and the roller gap that has been previously stored. That is, the calculation unit (600) applies the displacement measurement result measured while performing the pressurizing process to the relationship between the displacement and the roller gap that has been stored in the storage unit (500), and calculates the roller gap in the pressurizing process. At this time, in addition to the database of the storage unit (500), the roller gap can also be calculated by using the mapped image of the mapping unit (550).

[0096] More specifically, in the calculation unit (600), when the displacement measurement result of the first and second rollers (210, 220) at a specific position (i.e., any position in the extension direction (X)) and a specific rotation angle (i.e., any rotation angle among the rotation angles (θ)) in the initial state is D1, the roller gap (G) measurement result between the first and second rollers (210, 220) at a specific position and a specific rotation angle in the initial state is D2, and the displacement measurement result of the first and second rollers (210, 220) at the specific position and the specific rotation angle while performing the pressurizing process is D3, the roller gap (G') in the pressurizing process can be calculated using the following equation (1).

[0097] Gap=(D3-D1)+D2 Equation (1)

[0098] That is, assuming that the degree to which the roller gap (G) varies is directly reflected in the displacement of the first and second rollers (210, 220), the increase or decrease in the relative displacement of the first and second rollers (210, 220) in a state in which a pressurizing process is performed compared to the initial state directly corresponds to the increase or decrease in the roller gap (G).

[0099] Furthermore, the calculation unit (600) may calculate the roller gap (G') in the pressing process using the imaged result from the mapping unit (550). In this case, even when applying the imaged result, the calculation method as in Equation (1) may be applied, and as described above, the roller gap (G') may be calculated by performing learning on the image through a separate learning unit.

[0100] The above monitoring unit (650) receives in real time the calculation result of the roller gap (G') according to the extension direction (X) and rotation angle (θ) of the roller, which is calculated in the calculation unit (600), and monitors the real-time variable state of the roller gap (G').

[0101] Furthermore, the monitoring unit (650) can determine the degree of deformation or unevenness of rolling of the first and second rollers (210, 220) based on the monitoring results of the roller gap (G').

[0102] Accordingly, the monitoring unit (650) can control the pressurizing process in real time based on the deformation state or uneven rolling state of the first and second rollers (210, 220). That is, although not shown, a separate external force application unit capable of inducing deformation of the rollers may be provided on the outer surface or the rotational axis of the first and second rollers (210, 220), so that a predetermined external force can be applied to match the deformation position of the first and second rollers (210, 220). Furthermore, if the rotation of the first and second rollers (210, 220) is uneven, the rotational state of the rotational axis can be controlled to control rolling unevenness.

[0103] At this time, in the case of the external force application unit, it is provided on the rotation axis, and the position of the rotation axis of each of the first and second rollers (210, 220) can be varied, thereby controlling the roller gap (G). Alternatively, the external force application unit may be provided on the outer peripheral surface of the first and second rollers (210, 220), and at this time, a plurality of the external force application units may be provided at a predetermined interval on the outer peripheral surface. Thus, through control such as applying different external forces to each position, the roller gap (G) between the first and second rollers (210, 220) can be locally controlled differently for each position.

[0104] Through this feedback control process, the degree of deformation or unevenness of rolling of the first and second rollers (210, 220) can be compensated for, thereby improving the uniformity of the pressurizing process.

[0105] Hereinafter, a roller gap measurement method using the above measurement system (100) will be described. At this time, the roller gap measurement method below will be described focusing on the steps for measuring the roller gap, and overlapping explanations for the same parts as previously described in the detailed contents of each step will be omitted.

[0106] Fig. 6 is a flowchart illustrating a roller gap measurement method using the roller gap measurement system of Fig. 2.

[0107] Referring to FIG. 6, in the roller gap measurement method (hereinafter, referred to as the measurement method) using the measurement system (100), first, before performing the pressurization process, i.e., in the initial state, the displacement of the first and second rollers (210, 220) and the roller gap (G) between the first and second rollers (210, 220) are measured (step S10).

[0108] More specifically, before performing the pressurizing process, the displacement along the extension direction (X) and rotation angle (θ) of each of the first and second rollers (210, 220) is measured through the displacement measuring unit (300) (step S11).

[0109] At this time, as described above, the displacement measurement result can be derived as a displacement according to the extension direction (X) and rotation angle (θ) through the displacement derivation unit (400).

[0110] In addition, through the gap measuring unit (350), before performing the pressurizing process, the roller gap between the first and second rollers (210, 220) is measured (step S12).

[0111] At this time, the roller gap measurement result can also be derived as a roller gap according to the extension direction (X) and rotation angle (θ) through the gap derivation unit (450).

[0112] Meanwhile, when measuring the roller gap through the gap measuring unit (350), the roller gap can be measured by applying an external force to the first and second rollers (210, 220) through a separate external force applying unit to vary the roller gap.

[0113] After this, the displacement measurement result and the roller gap measurement result are stored in the storage unit (500) (step S20).

[0114] More specifically, the storage unit (500) can store the relationship between the displacement and the roller gap before performing the pressurizing process (step S21), and optionally, the mapping unit (550) can map the relationship between the displacement and the roller gap stored in the storage unit (500) into an image (step S22).

[0115] Through this, the relationship between the displacement and the roller gap according to the extension direction (X) and rotation angle (θ) of the roller can be stored. In addition, through the mapping unit (550), an image of the displacement according to the extension direction (X) and rotation angle (θ) of the roller can be mapped, an image of the roller gap according to the extension direction (X) and rotation angle (θ) of the roller can be mapped, an image of the displacement and the roller gap according to the extension direction (X) of the roller can be mapped for a specific rotation angle, or an image of the displacement and the roller gap according to the rotation angle (θ) of the roller can be mapped for a position in a specific extension direction.

[0116] After this, in the displacement measuring unit (300), the displacement of the first and second rollers (210, 220) is measured during the actual pressurizing process (step S30).

[0117] At this time, the measured displacement is, as already explained, the displacement according to the extension direction (X) and rotation angle (θ) of the first and second rollers (210, 220).

[0118] Furthermore, the displacement measured in this way is derived as a displacement result according to the extension direction and rotation angle through the displacement derivation unit (400) and provided to the calculation unit (600).

[0119] Thereafter, the operation unit (600) performs the pressurization process using the measurement results stored in the storage unit (500), and calculates the roller gap (G') in the pressurization process based on the displacement measurement results of the first and second rollers (210, 220) measured during the pressurization process (step S40).

[0120] At this time, the operation unit (600) may utilize the relationship between the displacement and the roller gap previously stored in the storage unit (500), or alternatively, may utilize the image stored in the mapping unit (550). Furthermore, if the image stored in the mapping unit (550) is utilized, the image learning results obtained by a separate learning unit, as described above, may be applied.

[0121] That is, in the above calculation unit (600), the relationship between the previously stored displacement and the roller gap is used to calculate the roller gap between the first and second rollers (210, 220) in real time, i.e., during the process of performing the pressurizing process (step S41).

[0122] Accordingly, the monitoring unit (650) monitors the roller gap (G') in real time, i.e., during the process of performing the pressurizing process, based on the roller gap calculation result from the operation unit (600) (step S42).

[0123] Furthermore, based on the monitoring results of the monitoring unit (650), the deformed state of the first and second rollers (210, 220) can be restored through feedback control or the non-uniform rolling state can be controlled so that the roller gap is maintained uniformly.

[0124] According to the embodiments of the present invention as described above, by measuring the displacement and roller gap of the first and second rollers in advance in the initial state, i.e., before performing the pressurizing process, when performing the actual pressurizing process, only the displacement of the first and second rollers is measured, thereby deriving the roller gap between the first and second rollers. Accordingly, by obtaining real-time roller gap information when performing the actual pressurizing process, feedback control of the roller gap is performed if necessary, so that more uniform and precise pressurization can be performed by maintaining a more uniform roller gap.

[0125] That is, when performing an actual pressurizing process, the limitation of being difficult to measure the roller gap due to the rolling material interposed between the first and second rollers, even though the deformation of the rollers is significantly caused, is overcome, thereby enabling real-time roller gap monitoring in the pressurizing process.

[0126] In particular, the displacement of the first and second rollers is obtained according to the extension direction and rotation angle, and the measured roller gap is matched according to the extension direction and rotation angle and stored in a database or mapped as an image, so that the displacement information of the first and second rollers can be derived for any position and any rotation angle in the pressing process, and if necessary, the three-dimensional shape of the deformed roller can be virtually obtained, so that the deformation state of the roller in the actual pressing process can be obtained in real time and necessary control can be performed.

[0127] At this time, the displacement can be measured by a contact or optical displacement measuring device, and the displacement is obtained by measuring the outer surface of the roller, so that there is no problem of measurement being limited by the supply of the rolling material even during the pressing process, and the limitation of measurement due to interference from peripheral equipment of the pressing device is minimized.

[0128] In addition, when performing the calculation of the roller gap, it is performed through a simple calculation based on the displacement measurement results in the initial state, the gap measurement results, and the displacement measurement results in the pressurization process, so real-time monitoring can be implemented through a simple and quick calculation.

[0129] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

Claims

1. A displacement measuring unit for measuring the displacement of the first and second rollers; A gap measuring unit for measuring the roller gap between the first and second rollers; A storage unit for storing the displacement measurement result and the roller gap measurement result before performing the pressurization process; and A roller gap measuring system comprising a calculation unit that calculates the roller gap in the pressurizing process based on the displacement measurement results of the first and second rollers measured while performing the pressurizing process using the stored measurement results.

2. In paragraph 1, the displacement measuring unit is, A first measuring part located on the outer surface of the first roller and measuring the shape of the first roller; and A roller gap measuring system characterized by including a second measuring unit located on the outer surface of the second roller and measuring the shape of the second roller.

3. In paragraph 2, The first measuring unit is arranged in multiple numbers on the outer surface of the first roller, and A roller gap measuring system characterized in that the second measuring unit is arranged in plurality on the outer surface of the second roller.

4. In paragraph 2, each of the first and second measuring parts is, A roller gap measuring system characterized by being a contact or optical displacement measuring instrument.

5. In the first paragraph, the gap measuring unit, An irradiation unit that provides light between the first and second rollers from one side of the first and second rollers; and A roller gap measuring system characterized by including a sensor unit that senses the irradiated light on the other side of the first and second rollers.

6. In paragraph 1, A roller gap measuring system further comprising an external force application unit that induces deformation of the first and second rollers.

7. In paragraph 6, the external force application unit is, A roller gap measuring system characterized by being provided on the rotation axis or outer surface of the first and second rollers to vary the roller gap.

8. In paragraph 6, the external force application unit is, A roller gap measuring system characterized by controlling the pressurization process by inducing deformation of the first and second rollers based on the roller gap calculation result of the above calculation unit.

9. In paragraph 6, the gap measuring unit is, A roller gap measuring system characterized in that, before performing the pressurizing process, deformation of the first and second rollers is induced and the roller gap is measured.

10. In paragraph 1, the storage unit is, A roller gap measurement system characterized in that the relationship between displacement and roller gap is stored based on the displacement measurement result and the roller gap measurement result.

11. In Clause 10, the above-mentioned operation unit, A roller gap measuring system characterized by applying the displacement measurement result measured while performing the above pressurization process to the relationship between the displacement and the roller gap stored in the storage unit, and calculating the roller gap in the above pressurization process.

12. In Paragraph 11, When the displacement measurement result of the first and second rollers at a specific position and a specific rotation angle is D1, the roller gap measurement result between the first and second rollers at the specific position and a specific rotation angle is D2, and the displacement measurement result of the first and second rollers at the specific position and a specific rotation angle while performing the pressing process is D3, The above operation unit is, Gap=(D3-D1)+D2 Equation (1) A roller gap measurement system characterized in that the roller gap (Gap) is calculated in the pressurizing process using the above equation (1).

13. In paragraph 10, Further comprising a mapping section for mapping the relationship between the displacement and the roller gap into an image, A roller gap measurement system characterized in that the above calculation unit calculates the roller gap in the pressurizing process using the mapped image.

14. In Clause 10, the above storage unit is, The displacement according to the extension direction and rotation angle of each of the first and second rollers is stored as the displacement measurement result, A roller gap measuring system characterized by matching the roller gap measurement results according to the extension direction and rotation angle of each of the first and second rollers with the displacement measurement results, and storing the relationship between the displacement and the roller gap.

15. A step of measuring the displacement of the first and second rollers and the roller gap between the first and second rollers before performing the pressurization process (step S10); A step of storing the above displacement measurement result and the above roller gap measurement result (step S20); A step of performing a pressurization process and measuring the displacement of the first and second rollers (step S30); and A roller gap measurement method comprising the step (step S40) of calculating the roller gap in the pressurization process based on the displacement measurement results of the first and second rollers measured while performing the pressurization process using the stored measurement results.

16. In paragraph 15, the above step S10 is, Before performing the above pressurization process, a step of measuring displacement according to the extension direction and rotation angle of each of the first and second rollers; and A roller gap measuring method characterized by including the step of measuring the roller gap between the first and second rollers before performing the above-mentioned pressurization process.

17. In paragraph 15, the above step S20 is, Before performing the above pressurization process, a step of storing the relationship between the displacement and the roller gap; and A roller gap measurement method characterized by including the step of mapping the relationship between the stored displacement and the roller gap into an image.

18. In Clause 17, the above step S40 is, A step of calculating the roller gap in the pressurization process using the relationship between the displacement and the roller gap; and A roller gap measurement method characterized by including a step of monitoring the roller gap in real time during the pressurization process based on the above roller gap calculation result.

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