CN118625745B - A production efficiency optimization method in LCD intelligent production system - Google Patents
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 31
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- 238000005498 polishing Methods 0.000 claims abstract description 166
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- 230000008569 process Effects 0.000 claims abstract description 11
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- 230000000875 corresponding effect Effects 0.000 claims description 8
- 230000002596 correlated effect Effects 0.000 claims description 4
- 238000009795 derivation Methods 0.000 claims 3
- 238000007517 polishing process Methods 0.000 abstract description 17
- 239000011521 glass Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000000877 morphologic effect Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41885—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by modeling, simulation of the manufacturing system
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The invention relates to the field of LCD production, in particular to a production efficiency optimization method in an LCD intelligent production system, which calculates stress influence characterization coefficients by measuring surface point cloud data of an LCD screen to be polished, divides stress influence categories of the LCD screen, selects a control mode for LCD screen production aiming at the stress influence categories of the LCD screen later, particularly aims at the LCD screen of the strong stress influence category, the method comprises the steps of collecting feedback force borne by a polishing mechanism, calculating polishing stability parameters according to fluctuation conditions of the feedback force and bending curvature of a polishing section, judging whether relevant process parameters need to be adjusted, adjusting polishing pressure and polishing speed according to adaptability of the polishing stability parameters, further reducing influence of shape characteristics of a curved surface screen on a polishing process, reducing damage in the polishing process, improving polishing quality, improving yield and improving production efficiency.
Description
Technical Field
The invention relates to the field of LCD production control, in particular to a production efficiency optimization method in an LCD intelligent production system.
Background
LCD screen, namely LCD screen (Liqu ID CRYSTA L DI SP L AY), is a mainstream flat panel display technology, is widely used in televisions, computer monitors, mobile phones, tablet computers and other intelligent devices, and in LCD screen production process, the edges of LCD screen usually need to be polished, so that the attractiveness is improved and sharp edges are prevented from influencing assembly and transportation.
Chinese patent publication No. CN113997431A discloses a processing technology of LCD special-shaped glass corners, which comprises the following steps of preprocessing a glass plate, sleeving a wear-resistant sleeve, cutting the corners of the glass plate, which need to be cut, through the wear-resistant sleeve, putting the glass plate sleeved with the wear-resistant sleeve on a glass cutting machine, cutting the redundant corners of the glass plate, which pass through the wear-resistant sleeve, by the glass cutting machine, polishing a semi-finished product, namely attaching the cut edges of the semi-finished product glass plate sleeved with the wear-resistant sleeve to a grinding disc, and forming special-shaped glass, namely taking down the glass plate sleeved with the wear-resistant sleeve when the wear-resistant sleeve is attached to the grinding disc, and separating the wear-resistant sleeve from the glass plate. The application reduces the risk of different grinding amounts of each batch of special-shaped glass caused by each operator grinding by experience, and has the effect of improving the production yield of each batch of special-shaped glass.
There are problems in the prior art that,
In the prior art, the influence of morphological characteristics of a screen on the polishing process is not considered when the curved screen or the bent screen is polished, so that the screen is easy to damage, the yield is low, and the production efficiency is influenced.
Disclosure of Invention
Therefore, the invention provides a production efficiency optimization method in an LCD intelligent production system, which is used for solving the problems that in the prior art, the influence of morphological characteristics of a screen on a polishing process is not considered when a curved screen or a bent screen is polished, the screen is easy to damage, the yield is low and the production efficiency is influenced.
To achieve the above object, in one aspect, the present invention provides a method for optimizing production efficiency in an intelligent LCD production system, comprising:
Step S1, measuring surface point cloud data of an LCD screen to be polished to construct a three-dimensional model of the LCD screen;
Step S2, determining stress influence parameters aiming at the LCD screen based on the three-dimensional model, and calculating stress influence characterization coefficients of the LCD screen based on the stress influence parameters to divide stress influence categories of the LCD screen, wherein the stress influence parameters comprise bending curvature of edges of the three-dimensional model and sizes of stress derivative directions;
step S3, selecting a control mode for the LCD screen production aiming at the stress influence type of the LCD screen, comprising,
Collecting feedback force born by a polishing mechanism, calculating polishing stability parameters based on fluctuation of the feedback force and the bending curvature of a current polishing section to judge whether the polishing pressure and the polishing speed of the polishing mechanism need to be adjusted, and adjusting the polishing pressure and the polishing speed to corresponding values based on the polishing stability parameters;
or, determining the polishing speed and the polishing pressure based on the hardness of the material of the LCD screen, and maintaining the fixed polishing speed and the fixed polishing pressure.
Further, in the step S2, the process of determining stress influencing parameters for the LCD screen by the three-dimensional model includes,
Calibrating an edge contour to be polished in the three-dimensional model, and determining a bending curvature aiming at the edge contour;
And determining the direction of the edge contour derived towards the inner side of the three-dimensional model as a stress derived direction, determining the distance between the edge contour and the other edge contour in the stress derived direction, and determining the distance as the size of the stress derived direction.
Further, in the step S2, stress influencing parameters are calculated according to formula (1),
In the formula (1), K represents a stress influencing parameter, L represents a bending curvature, L0 represents a preset bending curvature threshold, D represents a size, D0 represents a preset size threshold, α represents a bending curvature weight coefficient, and β represents a size weight coefficient.
Further, in the step S2, the process of classifying stress influence categories of the LCD screen includes,
Comparing the stress influence parameter with a preset stress influence parameter threshold;
If the stress influence parameter is greater than or equal to a preset stress influence parameter threshold, judging that the LCD screen belongs to a strong stress influence category;
And if the stress influence parameter is smaller than a preset stress influence parameter threshold, judging that the LCD screen belongs to a weak stress influence type.
Further, in the step S3, selecting a control mode for LCD screen production includes,
If the LCD screen belongs to the category of strong stress influence, judging that feedback force born by a polishing mechanism needs to be acquired, calculating a polishing stability parameter based on fluctuation of the feedback force and bending curvature of a characteristic polishing section, judging whether polishing pressure and polishing speed of the polishing mechanism need to be adjusted, and adjusting the polishing pressure and polishing speed to corresponding values based on the polishing stability parameter;
If the LCD screen belongs to the weak stress influence category, the grinding speed and the grinding pressure are determined to be adjusted based on the material characteristics of the LCD screen, and the fixed grinding speed and the fixed grinding pressure are maintained.
Further, in the step S3, grinding stability parameters are calculated according to a formula (2) based on fluctuation of the feedback force and bending curvature of the characteristic grinding section,
In the formula (2), E represents a grinding stability parameter, t represents a preset monitoring time period, fi represents a feedback force at the ith moment, F0 represents a feedback force average value, le represents a bending curvature of the current grinding section, L0 represents a preset bending curvature threshold value, and g represents an offset coefficient of 0.85< g <0.95.
Further, in the step S3, determining whether the polishing pressure and the polishing speed of the polishing mechanism need to be adjusted includes,
If the polishing stability parameter is larger than a preset polishing stability parameter comparison threshold, judging that the polishing pressure and the polishing speed of the polishing mechanism need to be adjusted.
Further, in the step S3, adjusting the polishing pressure and the polishing speed based on the polishing stabilization parameter includes,
And reducing the polishing pressure and the polishing speed, wherein the polishing pressure reduction and the polishing speed reduction are positively correlated to the polishing stability parameter.
Further, the polishing speed and the polishing pressure are adjusted based on the hardness of the material of the LCD screen, wherein,
The determined polishing speed and polishing pressure are inversely related to the hardness of the material.
Another aspect provides an intelligent production system for an LCD, comprising,
The polishing mechanism comprises a mechanical arm and a polishing head arranged on the mechanical arm, so that the mechanical arm controls a polishing path of the polishing head;
The detection module comprises a scanning unit which is arranged on the mechanical arm and used for collecting cloud data of a detection target point, and a stress monitoring unit which is arranged on the polishing head and used for monitoring stress of the polishing head;
the upper computer is respectively connected with the detection module and the polishing mechanism and used for controlling the polishing mechanism
And (5) acting.
Compared with the prior art, the method and the device have the advantages that the stress influence characterization coefficient is calculated by measuring the surface point cloud data of the LCD screen to be polished, the stress influence type of the LCD screen is divided, the control mode for the production of the LCD screen is selected according to the stress influence type of the LCD screen, particularly for the LCD screen with the strong stress influence type, the feedback force of the polishing mechanism is collected, the polishing stability parameter is calculated according to the fluctuation condition of the feedback force and the bending curvature of the polishing section, whether the relevant process parameter needs to be adjusted is judged, the polishing pressure and the polishing speed are adaptively adjusted according to the polishing stability parameter, the influence of the shape characteristic of the curved screen on the polishing process is reduced, the damage in the polishing process is reduced, the polishing quality is improved, the yield is improved, and the production efficiency is improved.
In particular, the invention considers the stress influence parameters of the LCD screen, including the bending curvature of the edge of the three-dimensional model and the dimension of the stress derivative direction, in the actual situation, when the edge of the curved screen is polished, the stress is conducted to the inside of the curved screen, the dimension of the curved screen influences the bearing capacity of the curved screen to main stress, and the stress is influenced by morphological characteristics to be continuously changed when the edge of the curved screen is polished due to the bending characteristics of the curved screen, and the polishing process is influenced as well, therefore, the invention considers the stress influence characterization coefficients calculated by the stress influence parameters, classifies the stress influence categories, provides data support for the follow-up selection of the control mode aiming at the production of the LCD screen, further reduces the influence of the shape characteristics of the curved screen to the polishing process, reduces the damage in the polishing process, improves the polishing quality, improves the yield and improves the production efficiency.
Especially, consider the LCD screen to different stress influence types select the control mode to screen production, for the LCD screen of strong stress influence type, because morphological feature's influence appears unusual under the multifactor influence in the process of polishing, consequently, calculate the stability parameter of polishing based on the feedback force that polishing mechanism receives and the bending curvature of current section of polishing, the stability of polishing under the characterization strong stress influence, and the reduction polishing pressure and the polishing speed of adaptation, and then the influence of curved surface screen's shape feature to the process of polishing reduces the damage in the process of polishing, the improvement quality of polishing, the improvement yields, improvement production efficiency.
In particular, for the LCD screen with weak stress influence type, the polishing process is relatively stable, the influence of hardness on the polishing process is mainly considered, polishing parameters are adaptively adjusted, and further polishing quality, yield and production efficiency are improved.
Drawings
FIG. 1 is a schematic diagram of steps of a method for optimizing production efficiency in an intelligent production system according to an embodiment of the invention;
FIG. 2 is a logic diagram of a division of stress influencing categories for LCD screens according to an embodiment of the invention;
FIG. 3 is a logic block diagram of a control scheme selected for the LCD screen production in accordance with an embodiment of the invention;
FIG. 4 is a logic diagram of an embodiment of the invention for determining whether an adjustment to the grinding mechanism is required.
Detailed Description
The invention will be further described with reference to examples for the purpose of making the objects and advantages of the invention more apparent, it being understood that the specific examples described herein are given by way of illustration only and are not intended to be limiting.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
In addition, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the term "connected" should be construed broadly, and for example, it may be a fixed connection, a detachable connection, or an integral connection, it may be a mechanical connection or an electrical connection, it may be a direct connection or an indirect connection through an intermediate medium, or it may be a communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 4, fig. 1 is a schematic diagram illustrating steps of a method for optimizing production efficiency in an intelligent production system according to an embodiment of the invention, fig. 2 is a logic block diagram for classifying stress influence categories of an LCD screen according to an embodiment of the invention, fig. 3 is a logic block diagram for selecting a control mode for production of the LCD screen according to an embodiment of the invention, and fig. 4 is a logic block diagram for determining whether adjustment of the polishing mechanism is required according to an embodiment of the invention. The production efficiency optimization method in the LCD intelligent production system comprises the following steps:
Step S1, measuring surface point cloud data of an LCD screen to be polished to construct a three-dimensional model of the LCD screen;
Step S2, determining stress influence parameters aiming at the LCD screen based on the three-dimensional model, and calculating stress influence characterization coefficients of the LCD screen based on the stress influence parameters to divide stress influence categories of the LCD screen, wherein the stress influence parameters comprise bending curvature of edges of the three-dimensional model and sizes of stress derivative directions;
step S3, selecting a control mode for the LCD screen production aiming at the stress influence type of the LCD screen, comprising,
Collecting feedback force born by a polishing mechanism, calculating polishing stability parameters based on fluctuation of the feedback force and the bending curvature of a current polishing section to judge whether the polishing pressure and the polishing speed of the polishing mechanism need to be adjusted, and adjusting the polishing pressure and the polishing speed to corresponding values based on the polishing stability parameters;
or, determining the polishing speed and the polishing pressure based on the hardness of the material of the LCD screen, and maintaining the fixed polishing speed and the fixed polishing pressure.
Specifically, the specific mode of acquiring the surface point cloud data of the LCD screen is not limited, for example, the scanning unit may be used to scan the LCD screen to acquire the surface point cloud data of the LCD screen, the mode of constructing the three-dimensional model according to the point cloud data is not limited, and professional three-dimensional modeling software may be used for constructing the three-dimensional model, which is not described in detail in the prior art.
Specifically, the feedback force applied by the polishing mechanism is the force applied by the polishing head, which is not described in detail.
Specifically, the polishing pressure is the pressure of the polishing head against the LCD screen to be polished, which will not be described in detail.
Specifically, the polishing speed is a moving speed of the polishing head of the polishing mechanism when moving along a predetermined polishing route, and the polishing speed can be controlled by the upper computer, which is not described in detail.
In particular, in the step S2, the process of determining stress influencing parameters for the LCD screen by the three-dimensional model includes,
Calibrating an edge contour to be polished in the three-dimensional model, and determining a bending curvature aiming at the edge contour;
And determining the direction of the edge contour derived towards the inner side of the three-dimensional model as a stress derived direction, determining the distance between the edge contour and the other edge contour in the stress derived direction, and determining the distance as the size of the stress derived direction.
Specifically, in the step S2, stress influencing parameters are calculated according to formula (1),
In the formula (1), K represents a stress influencing parameter, L represents a bending curvature, L0 represents a preset bending curvature threshold, D represents a size, D0 represents a preset size threshold, α represents a bending curvature weight coefficient, and β represents a size weight coefficient.
Specifically, the bending curvature threshold is selected within the interval [800r,1100r ], and the size threshold is selected within the interval [25cm,35cm ];
alpha is 0.65 and beta is 0.35.
The invention considers the stress influence parameters of the LCD screen, including the bending curvature of the edge of the three-dimensional model and the dimension of the stress derivative direction, in the actual situation, when the edge of the curved surface screen is polished, the stress is conducted to the inside of the curved surface screen, the dimension of the curved surface screen influences the bearing capacity of the curved surface screen to main stress, and the stress is influenced by morphological characteristics to be continuously changed when the edge of the curved surface screen is polished due to the bending characteristics of the curved surface screen, and the polishing process is influenced as well, therefore, the invention considers the stress influence characterization coefficient calculated by the stress influence parameters, classifies the stress influence types, provides data support for the follow-up selection of the control mode aiming at the production of the LCD screen, further reduces the influence of the shape characteristics of the curved surface screen to the polishing process, reduces the damage in the polishing process, improves the polishing quality, improves the yield and improves the production efficiency.
In particular, in the step S2, the process of classifying stress influence categories of the LCD screen includes,
Comparing the stress influence parameter with a preset stress influence parameter threshold;
If the stress influence parameter is greater than or equal to a preset stress influence parameter threshold, judging that the LCD screen belongs to a strong stress influence category;
And if the stress influence parameter is smaller than a preset stress influence parameter threshold, judging that the LCD screen belongs to a weak stress influence type.
Specifically, the stress influencing parameter threshold is selected within the interval [1.15,1.3 ].
In particular, in the step S3, the selection of the control mode for the LCD screen production includes,
If the LCD screen belongs to the category of strong stress influence, judging that feedback force born by a polishing mechanism needs to be acquired, calculating a polishing stability parameter based on fluctuation of the feedback force and bending curvature of a characteristic polishing section, judging whether polishing pressure and polishing speed of the polishing mechanism need to be adjusted, and adjusting the polishing pressure and polishing speed to corresponding values based on the polishing stability parameter;
If the LCD screen belongs to the weak stress influence category, the grinding speed and the grinding pressure are determined to be adjusted based on the material characteristics of the LCD screen, and the fixed grinding speed and the fixed grinding pressure are maintained.
Specifically, in the step S3, grinding stability parameters are calculated according to the formula (2) based on the fluctuation of the feedback force and the bending curvature of the characteristic grinding section,
In the formula (2), E represents a grinding stability parameter, t represents a preset monitoring time period, fi represents a feedback force at the ith moment, F0 represents a feedback force average value, le represents a bending curvature of the current grinding section, L0 represents a preset bending curvature threshold value, and g represents an offset coefficient of 0.85< g <0.95.
To ensure response timeliness, the monitoring duration is selected within the interval [1s,2s ].
Specifically, in the step S3, the step of judging whether the polishing pressure and the polishing speed of the polishing mechanism need to be adjusted includes,
If the polishing stability parameter is larger than a preset polishing stability parameter comparison threshold, judging that the polishing pressure and the polishing speed of the polishing mechanism need to be adjusted.
Specifically, the sharpening stability parameter versus threshold is selected within interval [1.3,1.6 ].
Specifically, in the step S3, adjusting the polishing pressure and the polishing speed based on the polishing stabilization parameter includes,
And reducing the polishing pressure and the polishing speed, wherein the polishing pressure reduction and the polishing speed reduction are positively correlated to the polishing stability parameter.
In this embodiment, the number of the elements, alternatively,
If E >1.8, determining the polishing pressure reduction amount as a first pressure reduction amount F1, setting f1= 0.3F0, determining the polishing speed reduction amount as a first speed reduction amount V1, and setting v1= 0.4V0;
if 1.6< E is less than or equal to 1.8, determining that the polishing pressure reduction is a second pressure reduction F2, setting F2= 0.15F0, determining that the polishing speed reduction is a second speed reduction V2, and setting V1= 0.2V0;
F0 represents the original grinding pressure and V0 represents the original grinding speed.
The LCD screen of the category is subjected to the influence of the strong stress, and the LCD screen of the category is subjected to the influence of the morphological characteristics, so that the abnormal conditions are easy to occur under the influence of multiple factors in the polishing process, and the polishing stability parameters are calculated based on the feedback force of the polishing mechanism and the bending curvature of the current polishing section, so that the polishing stability under the influence of the strong stress is represented, the polishing pressure and the polishing speed are reduced adaptively, the influence of the shape characteristics of the curved screen on the polishing process is reduced, the damage in the polishing process is reduced, the polishing quality is improved, the yield is improved, and the production efficiency is improved.
Specifically, the polishing speed and polishing pressure are adjusted based on the hardness of the material of the LCD screen, wherein,
The determined polishing speed and polishing pressure are inversely related to the hardness of the material.
In this embodiment, the number of the elements, alternatively,
The hardness of the material is measured by taking the Mohs hardness as the measurement,
If the hardness of the material is less than 5.5, the first grinding speed Ve1 is selected, the Ve1=Ve0×1.3 is set, the first grinding pressure Fe1 is selected, and the Fe1=Fe0×1.25 is set;
if the hardness of the material is greater than or equal to 5.5, selecting the material as a second polishing speed Ve2, setting ve2=0.8ve0, selecting the material as a second polishing pressure Fe2, and setting fe2=0.8fe0;
wherein Ve0 represents a reference polishing speed, 0.5cm/s < Ve0<1.5cm/s, and Fe0 represents a reference polishing pressure, 25n < fe0<50n.
Specifically, still provide a LCD intelligence production system, it includes:
The polishing mechanism comprises a mechanical arm and a polishing head arranged on the mechanical arm, so that the mechanical arm controls a polishing path of the polishing head;
The detection module comprises a scanning unit which is arranged on the mechanical arm and used for collecting cloud data of a detection target point, and a stress monitoring unit which is arranged on the polishing head and used for monitoring stress of the polishing head;
and the upper computer is respectively connected with the detection module and the polishing mechanism and used for controlling the polishing mechanism to act.
Specifically, the specific structure of the mechanical arm is not limited, and the mechanical arm only needs to meet the degree of freedom under the corresponding working condition, drives the polishing head to move along a preset polishing path and adjusts the contact force between the polishing head and the LCD screen, which is not described again.
Specifically, the specific structure of the scanning unit is not limited, and only the point cloud data needs to be acquired, for example, the scanning unit may be a laser scanning device, which is in the prior art and is not described in detail.
Specifically, the specific structure of the polishing head is not limited, for example, the polishing head can be a rotary polishing head, and of course, the polishing head can also be in other forms, which is the prior art and is not repeated.
Specifically, the stress monitoring unit may be a stress sensor, and the setting position of the stress sensor is not limited, and only needs to realize corresponding functions, for example, the polishing head may be fixed at the tail end of the mechanical arm through the fixture, and the stress sensor may be set at the contact position of the polishing head and the fixture to monitor the force applied to the polishing head, which is not described herein.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
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| CN101303256A (en) * | 2008-06-23 | 2008-11-12 | 长春理工大学 | Liquid Crystal Based Embedded Polarization Meter |
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| CN101303256A (en) * | 2008-06-23 | 2008-11-12 | 长春理工大学 | Liquid Crystal Based Embedded Polarization Meter |
| CN102116958A (en) * | 2011-03-03 | 2011-07-06 | 福耀玻璃工业集团股份有限公司 | Manufacturing method for dimming laminated glass |
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