A BNB dispensing process

Abstract

The present invention provides a BNB glue dispensing process, comprising the following steps: step S1, glue dispensing track import, import the template information of the standard workpiece, and generate the template glue dispensing track; step S2, workpiece positioning and edge finding, scanning the current glue dispensing workpiece through the visual module to obtain the XYZ position information of the edge of the workpiece, and calculating and correcting the template glue dispensing track through software to obtain the actual glue dispensing track; step S3, point-building outer glue wall and inner glue wall, point out the outer glue wall and inner glue wall on the workpiece according to the actual glue dispensing track and solidify to form a glue dispensing groove on the workpiece; step S4, perform at least two glue fillings, stand and solidify after the glue is leveled. Point-building inner glue wall and outer glue wall on the workpiece, replacing the role of the mold, does not require the mold for glue dam molding, and can reduce costs; then, perform at least two or more glue fillings in the glue dispensing groove, and the self-leveling flatness of the glue in the glue dispensing groove is better.

Description

Technical Field

[0001] The invention relates to the technical field of display screen production, in particular to a BNB glue dispensing process. Background Art

[0002] The screen bonding process usually requires the glue dam to be dotted on the back of the backlight module for the bonding of the screen and the middle frame in the post-process. The traditional solution is to use a mold, install the mold on the back of the screen, fill the mold with glue, and wait for the glue to solidify before removing the mold. The size and shape of each type of product are different, which requires the company to design a set of dispensing molds for each type of product. The production cost is high and cannot be universal. There are some dispensing equipment on the market that does not require a mold, which is mainly composed of an image acquisition part, an image processing part, and a motion control part. The main workflow is: first, place the workpiece on the dispensing machine stage, and obtain the dispensing path on the workpiece by manual teaching as the reference dispensing path and save it in the industrial computer. Secondly, control the CCD to take pictures to collect the image of the workpiece, and import the obtained image into the industrial computer as a template image. Then, when the workpiece is placed again, the current dispensing workpiece image is matched with the template image through the image processing software to find the offset and rotation of the current dispensing workpiece relative to the template. Finally, the coordinates of the dispensing path after the workpiece is offset are calculated, and the dispensing is controlled by the motion control system. Application of the above solution There is a type of application and IJP dispensing method to generate glue dams on the market. It is layer-by-layer dispensing. Due to the shrinkage characteristics of the glue, it is easy to form a trapezoidal structure with a small top and a large bottom after stacking layer by layer (such as Figure 1 As shown in the figure, it is not conducive to the design of narrower borders of OLED screens. Secondly, the amount of glue discharged by IJP nozzles at a time is limited. In order to discharge the entire layer of glue at one time, each IJP nozzle has multiple nozzle groups in a row. However, this results in a certain gap between the glue sprayed by adjacent nozzles. In order for the glue dam to form quickly without collapse, it is necessary to use a high thixotropic glue that can solidify quickly. This causes the glue to solidify before it is completely leveled, resulting in an uneven surface of the glue layer, such as Figure 2 As shown, it is not conducive to the bonding effect between the screen and the middle frame in the subsequent manufacturing process (that is, the bonding contact area is relatively limited). Summary of the invention

[0003] To solve the above problems, the present invention aims to provide a BNB dispensing process.

[0004] The present invention is implemented by the following method: A BNB dispensing process comprises the following steps:

[0005] Step S1, importing the dispensing track, importing the template information of the standard workpiece, and generating the template dispensing track;

[0006] Step S2, workpiece positioning and edge finding, scanning the current dispensing workpiece through the visual module to obtain the XYZ position information of the workpiece edge, and calculating and correcting the template dispensing trajectory through the software to obtain the actual dispensing trajectory;

[0007] Step S3, dotting the outer glue wall and the inner glue wall, dotting the outer glue wall and the inner glue wall layer by layer on the workpiece according to the actual dotting track and solidifying them to form a dotting groove on the workpiece;

[0008] Step S4, perform glue filling at least twice; for the first glue filling, calculate the volume of the glue dispensing groove through the visual module scanning, fill the glue dispensing groove with a specified volume ratio of glue for the first time through the glue dispensing equipment, let it stand and wait for the glue to automatically level in the glue dispensing groove before solidifying; for the second glue filling, calculate the remaining glue filling amount of the glue dispensing groove through the visual module scanning again, control the glue dispensing equipment to fill the glue for the second time according to the remaining glue filling amount, let it stand and wait for the glue to level before solidifying.

[0009] Preferably, the contour of the glue dispensing groove between the inner glue wall and the outer glue wall is scanned by a visual module, and the cross-sectional area S10 at each key point of the contour is calculated. The reference glue dispensing speed of a standard area S0 is V0, and the actual glue dispensing speed V1=V0 / (S10 / S0) is calculated.

[0010] Preferably, in step S3, the glue used to construct the outer glue wall and the inner glue wall is a glue with high thixotropic properties; the glue dispensing equipment constructs the outer glue wall layer by layer according to the actual glue dispensing trajectory until the specified height is reached, and solidifies during the construction process; the inner glue wall is constructed layer by layer until the specified height is reached, and solidifies during the construction process.

[0011] Preferably, in step S3, after the outer glue wall and the inner glue wall are both point-built, they are cured and shaped again.

[0012] Preferably, in step S4, the amount of glue filled for the first time is 60%-90% of the total volume of the glue dispensing groove; during the second filling, the remaining amount of glue is filled into the glue dispensing groove; after the first filling of glue, the glue in the glue dispensing groove is heated to reduce the viscosity of the glue and increase the flow rate of the glue; after the second filling of glue, the glue in the glue dispensing groove is heated to reduce the viscosity of the glue and increase the flow rate of the glue.

[0013] Preferably, step S2 also includes step S21, edge-finding compensation XY position and normal offset of the glue dispensing position, moving the visual module to the glue dispensing position to take a picture to obtain an image, and placing a caliper tool in the image; step S22, obtaining the center coordinates of the edge position of the workpiece, and obtaining the center coordinates (X1, Y1) of the edge position of the workpiece by running the caliper tool; step S23, using the given caliper angle (angle), glue dispensing position coordinates (X0, Y0) and workpiece edge position center coordinates (X1, Y1), calculate the normal offset VectorGap1 of the outer glue wall from the glue dispensing position coordinates to the edge of the workpiece, and the perpendicular coordinates (X2, Y2); step S24, according to the glue dispensing position coordinates (X0, Y0), the workpiece edge position center coordinates (X1, Y1) and the caliper angle (angle), and the outer glue wall Normal offset distance VectorGap1, calculate the glue point position coordinates (X3, Y3) of the outer glue wall at the specified position; step S25, refer to step S23 and step S24, calculate the normal offset VectorGap2 of the glue point position coordinates of the inner glue wall, and calculate the glue point position coordinates (X4, Y4) of the inner glue wall, and the distance between the inner glue wall and the outer wall is VectorGap2-VectorGap1; step S26, by scanning the edge of the workpiece, extract the new edge position (X5, Y5), and then according to the deviation (X, Y) between the center coordinates of the edge position of the workpiece (X5, Y5) and the center coordinates of the edge position of the template workpiece (X1, Y1), obtain the new inner glue wall glue point position coordinates (X6, Y6) and the new outer glue wall glue point position coordinates (X7, Y7), , ; , ; thereby compensating the XY tolerance of the workpiece; step S27, measuring and compensating the Z coordinate tolerance of the edge of the workpiece.

[0014] Preferably, in step S23, the normal offset VectorGap1 is calculated according to the straight line equation , calculate the slope of the line , ,intercept ;

[0015] Calculate the angle of the normal angle0: If angle0 is less than -π, then , if angle0 is greater than π, then ;

[0016] According to the value of angle0 and the center coordinates of the workpiece edge position (X1, Y1), calculate VectorGap1:

[0017] ;

[0018] Calculate the foot coordinate (X2, Y2): , ;

[0019] Determine the sign of VectorGap1 according to the quadrant of angle0 and the relative position of (X1, Y1) and (X2, Y2): If angle0 is in the first or fourth quadrant and X1 ≥ X2, then VectorGap1 is positive; if angle0 is in the first or fourth quadrant and X1 < X2, then VectorGap1 is negative; if angle0 is in the second or third quadrant and X1 ≥ X2, then VectorGap1 is negative; if angle0 is in the second or third quadrant and X1 < X2, then VectorGap1 is positive; if angle0 = -π / 2 and y1 ≥ y2, then VectorGap1 is negative, otherwise it is positive; if angle0 = -π and x1 ≥ x2, then VectorGap1 is negative, otherwise it is positive; if angle0 = π / 2 and y1 ≥ y2, then VectorGap1 is positive, otherwise it is negative; if angle0 = 0 and x1 ≥ x2, then VectorGap1 is positive, otherwise it is negative;

[0020] In step S24, calculate the dispensing position coordinates (X3, Y3) of the outer rubber wall at the specified position according to the normal offset VectorGap1:

[0021] , , ,

[0022] , ,

[0023] ,

[0024] .

[0025] Preferably, in step S27, obtain the coordinates (X2, Z2) of the workpiece edge position through a point-finding tool; at the same time, use a line-finding tool to obtain the line coordinates (X0, Z0) and (X1, Z1) of the workpiece center line position; calculate the foot coordinates (X3, Z3) of the edge position point to the straight line according to the obtained coordinates; the straight line here is defined by the points (X0, Z0) and (X1, Z1), and the calculation formula is as follows:

[0026] , , ,

[0027] , ;

[0028] Assume that the height of the dispensing position is Z4, then the height difference between the dispensing position and the upper surface of the workpiece center line is During the glue dispensing process of the inner and outer glue walls, a 3D scan is performed on the edge of the workpiece to obtain the height Z5 of the upper surface of the workpiece, and then the height difference Z is added to obtain the new glue dispensing height position Z4.

[0029] Preferably, before performing step S3, the surface of the workpiece is cleaned by a plasma cleaning device to reduce the water drop angle.

[0030] Preferably, before performing step S4, the surface of the workpiece is cleaned again by a plasma cleaning device to increase the fluidity of the glue filling between the inner glue wall and the outer glue wall.

[0031] The beneficial effects of the present invention are as follows: the present invention provides a BNB dispensing process. Compared with the prior art, the present invention has at least the following technical effects: 1. By changing the original method of forming a glue dam by dispensing glue layer by layer to first dispensing an inner glue wall and an outer glue wall on the workpiece to form a dispensing groove on the workpiece, it plays a role in replacing the mold, and no mold is needed for glue dam molding, which can reduce costs; then, the glue is filled in the dispensing groove at least twice, and the self-leveling flatness of the glue in the dispensing groove is better, and multiple fillings of glue help to avoid the problem of concave in the middle of the glue surface caused by glue shrinkage, and there will be no problem of surface unevenness and trapezoidal shape caused by directly using multiple groups of IJP nozzles to form the overall glue dam, which effectively increases the flatness of the end face of the glue dam used for bonding on the back of the screen. 2. According to the size of the cross-sectional area of ​​the key part of the dispensing groove, by comparing it with the standard cross-sectional size, the dispensing nozzle can be adjusted in the nozzle movement speed of the corresponding dispensing area to achieve the dispensing amount within the adjustment area, so that the amount of glue filled meets the glue amount requirement of the dispensing groove in the corresponding area, so that the glue in the entire dispensing groove can be leveled more quickly, so as to increase the forming speed of the glue dam. 3. The glue wall is built layer by layer with a dispensing nozzle, and the glue for the outer glue wall and the inner glue wall has a high thixotropic property, and adopts follow-up curing, which is convenient for the glue to solidify quickly to form a glue wall with high verticality, so as to ensure the molding accuracy of the glue wall, so as to ensure that the glue dam meets the accuracy requirements of the workpiece after the final molding. 4. Curing again after the inner and outer glue walls are formed will help to improve the strength of the glue wall and avoid deformation when filling with glue. 5. The amount of glue filled in step S4 is less than the previous time. Since the glue has the characteristic of shrinking after solidification, the more glue is filled at one time, the larger the shrinkage volume will be after solidification. Therefore, the later the glue is filled, the smaller the subsequent shrinkage volume will be, which means that the subsequent shrinkage volume will be smaller to ensure the flatness of the glue surface. The number of glue fillings is set to two, and the glue filled in the latter time makes up for the concave surface generated after the previous glue filling, which can take into account the flatness of the glue surface and the rate of glue dam forming. 6. Compensate for the tolerance of the workpiece and the position deviation of the workpiece on the fixture through software calculation to improve the accuracy of the glue dam forming. 7. And heat the glue during the two times of filling glue to reduce the viscosity of the glue and increase the flow rate of the glue; it is used to increase the leveling speed of the glue in the glue dispensing groove, so as to increase the forming speed of the glue dam. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of microscopic imaging of the existing glue dam formed by directly using the IJP nozzle group for dispensing.

[0033] Figure 2 This is another microscopic imaging diagram of the existing direct use of the IJP nozzle group to dispense glue to form the glue dam.

[0034] Figure 3It is a flow chart of a BNB dispensing process of the present invention.

[0035] Figure 4 It is a process flow chart of the present invention for point-building glue dam and filling glue.

[0036] Figure 5 It is a schematic diagram of calibrating relevant coordinate points using a caliper tool in step S2 of the present invention.

[0037] Figure 6 It is a schematic diagram of the state of scanning the edge position of the workpiece to obtain a 3D image and placing a caliper tool according to the present invention.

[0038] Figure 7 It is a schematic diagram of the outline of the position obtained according to the caliper position by using the cross-sectional area tool of the present invention.

[0039] Figure 8 It is a schematic diagram of the present invention using a tool to obtain the line segment coordinates (X0, Z0) (X1, Z1) of the CG position of the workpiece.

[0040] Fig. 9 It is a schematic diagram of selecting the inspection points for dispensing glue on four sides of the workpiece.

[0041] Fig.10 It is the flatness (planarity) detection data of each point of the four-side glue-dispensing workpiece using the process of the present invention.

[0042] Fig.11 It is the detection data of the glue width at each point of the workpiece with four sides glued using the process of the present invention.

[0043] Fig.12 It is a schematic diagram of selecting the inspection points for unilateral dispensing on a workpiece.

[0044] Fig.13 It is the flatness (planarity) detection data of each point on the workpiece using the process of the present invention for single-sided dispensing.

[0045] Fig.14 It is the detection data of the glue width at each point of the workpiece using the process of the present invention for single-sided glue dispensing.

[0046] Explanation of the accompanying figures: 17, workpiece; 18, inner rubber wall; 19, outer rubber wall. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] See also Figures 3 to 14 , a BNB dispensing process, comprising the following steps:

[0049] Step S1, importing the glue dispensing track, importing the template information of the standard workpiece 17, and generating the template glue dispensing track;

[0050] Step S2, positioning and edge finding of the workpiece 17, scanning the current glue-dispensing workpiece 17 through the visual module to obtain the XYZ position information of the edge of the workpiece 17, and calculating and correcting the glue-dispensing trajectory of the template through the software to obtain the actual glue-dispensing trajectory;

[0051] Step S3, spot-build the outer glue wall 19 and the inner glue wall 18, spot-build the outer glue wall 19 and the inner glue wall 18 layer by layer on the workpiece 17 according to the actual glue spotting track and solidify them to form a glue spotting groove on the workpiece 17;

[0052] Step S4, perform glue filling at least twice; the first time of glue filling, calculate the volume of the glue dispensing groove by visual module scanning, fill the glue dispensing groove with a specified volume ratio of glue by the glue dispensing device for the first time, wait for the glue to automatically level in the glue dispensing groove and then solidify; the second time of glue filling, calculate the remaining glue filling amount of the glue dispensing groove by visual module scanning again, control the glue dispensing device to fill the glue for the second time according to the remaining glue filling amount, and wait for the glue to level and then solidify. The preferred standard workpiece 17 template is imported and the template glue dispensing trajectory is generated by CAD. By changing the original method of forming glue dams by dispensing glue layer by layer to first dispensing inner glue walls 18 and outer glue walls 19 on the workpiece 17 to form glue dispensing grooves on the workpiece 17, the mold is replaced and no mold is needed for glue dam molding, which can reduce costs; then the glue dispensing groove is filled with glue at least twice, and the self-leveling flatness of the glue in the glue dispensing groove is better, and multiple glue fillings help avoid the problem of concave in the middle of the glue surface caused by glue shrinkage, and there will be no surface unevenness and trapezoidal problems caused by using multiple sets of IJP nozzles to directly form the overall glue dam, which effectively increases the flatness of the glue dam surface for bonding on the back of the screen. BNB is the abbreviation of Bank Narrow Border. This process can be used for both annular glue dam molding surrounding the entire back of the workpiece (four sides) and glue dam molding on one or more sides of the back of the workpiece.

[0053] See also Figure 3 to Figure 4Preferably, the outline of the glue spot groove between the inner glue wall 18 and the outer glue wall 19 is scanned by a visual module, and the cross-sectional area S10 at each key point of the outline is calculated. The reference glue spot speed of a standard area S0 is V0, and the actual glue spot speed V1=V0 / (S10 / S0) is calculated. According to the size of the cross-sectional area of ​​the key part of the glue spot groove, by comparing with the standard cross-sectional size, the movement speed of the glue spot nozzle in the corresponding glue spot area can be adjusted to achieve the glue spot amount within the adjustment area, so that the filled glue amount meets the glue amount requirement of the corresponding area glue spot groove, so that the glue in the entire glue spot groove can be leveled more quickly to increase the molding speed of the glue dam. Preferably, the visual module can be a 3D camera, but is not limited to this.

[0054] See also Figures 3 to 8 Preferably, in step S3, the glue used to build the outer glue wall 19 and the inner glue wall 18 is a glue with high thixotropic properties; the glue dispensing equipment builds the outer glue wall 19 layer by layer according to the actual glue dispensing trajectory until the specified height is reached, and solidifies during the construction process; the inner glue wall 18 is built layer by layer until the specified height is reached, and solidifies during the construction process. The glue wall is built layer by layer using a glue dispensing nozzle, and the glue used to build the outer glue wall 19 and the inner glue wall 18 is a glue with high thixotropic properties, and solidifies by following, so that the glue quickly solidifies to form a glue wall with high verticality, so as to ensure the molding accuracy of the glue wall, so as to ensure that the glue dam meets the workpiece accuracy requirements after the final molding. The glue dispensing equipment is an existing equipment and will not be described in detail.

[0055] See also Figure 3 to Figure 4 Preferably, in step S3, after the outer glue wall 19 and the inner glue wall 18 are both point-built, they are cured again. After the inner glue wall 18 and the outer glue wall 19 are formed, curing again helps to improve the strength of the glue wall and avoid deformation when filling with glue. Preferably, curing uses a UV light source to accelerate the curing speed.

[0056] See also Figure 3 to Figure 4Preferably, in step S4, the amount of glue filled for the first time is 60%-90% of the total volume of the glue-dispensing groove; during the second filling, the remaining amount of glue is filled into the glue-dispensing groove; after the first filling of glue, the glue in the glue-dispensing groove is heated to reduce the viscosity of the glue and increase the flow rate of the glue; after the second filling of glue, the glue in the glue-dispensing groove is heated to reduce the viscosity of the glue and increase the flow rate of the glue, which is used to increase the leveling speed of the glue in the glue-dispensing groove, so as to ultimately increase the molding speed of the glue dam. The amount of glue filled in step S4 is less than the previous time. Since the glue has the characteristic of shrinking after solidification, the more glue is filled at one time, the larger the shrinkage volume will be after solidification. Therefore, the later the number of times the glue is filled, the smaller the glue is filled, that is, the subsequent shrinkage volume becomes smaller to ensure the flatness of the glue surface. The number of times the glue is filled is set to twice, and the glue filled in the latter time makes up for the concave surface generated after the previous glue filling, which can take into account the flatness of the glue surface and the rate of glue dam molding. The preferred amount of glue filled for the first time is 75%, 80%, 85% of the volume of the glue dispensing groove, etc., but it is not limited to this. After that, the glue dispensing groove is scanned again by the visual module to calculate the remaining volume of the glue dispensing groove, and then the corresponding amount of glue is filled again according to the remaining volume. Of course, it is also possible to fill the glue three times, for example, 60% is filled for the first time, 30% is filled for the second time, and the remaining volume of the glue dispensing groove is scanned by the visual module for the third time, and the glue corresponding to the remaining volume is filled. It can also be four times or more, but it is not limited to this. It is preferred to let it stand for 1.5min-3min after the first and second fillings of glue for leveling and curing.

[0057] See also Figures 3 to 5 Preferably, step S2 also includes step S21, edge-finding compensation XY position and normal offset of the dispensing position, moving the visual module (which may be a CCD) to the dispensing position to take a photo to obtain an image, and placing a caliper tool (CogCaliperTool) in the image, such as Figure 5 Step S22, obtain the edge position coordinates of the workpiece 17, by running the caliper tool to obtain the center coordinates of the edge position of the workpiece (such as Figure 5Step S23, using the given caliper angle (angle), the dispensing position coordinates (X0, Y0) and the workpiece edge position center coordinates (X1, Y1), calculate the normal offset VectorGap1 of the outer glue wall from the dispensing position coordinates to the edge of the workpiece (the vertical distance between the dispensing point and the edge of the workpiece 17, i.e., the green straight line in the middle of the caliper); Step S24, according to the dispensing position coordinates (X0, Y0), the workpiece edge position center coordinates (X1, Y1) and the caliper angle (angle), as well as the normal offset distance VectorGap1 of the outer glue wall, calculate the dispensing position coordinates (X3, Y4) of the outer glue wall at the specified position 3); Step S25, refer to step S23 and step S24, calculate the normal offset VectorGap2 of the inner glue wall glue point position coordinates, and calculate the glue point position coordinates (X4, Y4) of the inner glue wall, the spacing between the inner glue wall and the outer wall is VectorGap2-VectorGap1; Step S26, by performing edge scanning on the edge of the workpiece 17, extract the new edge position (X3, Y3), and then according to the deviation (X, Y) between the center coordinates of the edge position of the workpiece (X5, Y5) and the center coordinates of the edge position of the template workpiece (X1, Y1), thereby obtaining the new inner glue wall glue point position coordinates (X6, Y6) and the new outer glue wall glue point position coordinates (X7, Y7), , ; , ; thereby compensating the XY tolerance of the workpiece; step S27, measuring and compensating the Z coordinate tolerance of the edge of the workpiece 17, the actual dispensing track can be obtained. In order to correct the actual placement position of each workpiece 17 and the size deviation of the standard workpiece 17, the accuracy of the glue wall point construction, that is, the molding accuracy of the final glue dam, is guaranteed.

[0058] See also Figures 3 to 5 Preferably, in step S23, the normal offset VectorGap1 is calculated according to the straight line equation , calculate the slope of the line , ,intercept ;

[0059] Calculate the angle of the normal angle0: If angle0 is less than -π, then , if angle0 is greater than π, then ;

[0060] According to the value of angle0 and the center coordinates of the workpiece edge position (X1, Y1), calculate VectorGap1:

[0061] ;

[0062] Calculate the foot coordinate (X2, Y2): , ;

[0063] Determine the sign of VectorGap1 according to the quadrant of angle0 and the relative position of (X1, Y1) and (X2, Y2): If angle0 is in the first or fourth quadrant and X1 ≥ X2, then VectorGap1 is positive; if angle0 is in the first or fourth quadrant and X1 < X2, then VectorGap1 is negative; if angle0 is in the second or third quadrant and X1 ≥ X2, then VectorGap1 is negative; if angle0 is in the second or third quadrant and X1 < X2, then VectorGap1 is positive; if angle0 = -π / 2 and y1 ≥ y2, then VectorGap1 is negative, otherwise it is positive; if angle0 = -π and x1 ≥ x2, then VectorGap1 is negative, otherwise it is positive; if angle0 = π / 2 and y1 ≥ y2, then VectorGap1 is positive, otherwise it is negative; if angle0 = 0 and x1 ≥ x2, then VectorGap1 is positive, otherwise it is negative;

[0064] In step S24, calculate the dispensing position coordinates (X3, Y3) of the outer rubber wall at the specified position according to the above normal offset VectorGap1:

[0065] , , ,

[0066] , ,

[0067] ,

[0068] , in this step, (X2, Y2) is the foot coordinate of the dispensing position coordinate (X0, Y0). Compensate for the tolerance in the horizontal direction of the workpiece 17 through the above calculation to ensure that the dispensing trajectory matches the current dispensing workpiece 17 and guarantee the forming accuracy of the glue dam.

[0069] Please refer to Figure 3 to Figure 4 , Figures 6 to 8 , preferably, in step S26, it further includes 1) using a 3D camera (vision module) to scan the edge position of the workpiece to obtain a 3D image, and placing a caliper tool CogCaliperTool, as Figure 62) Use the cross-sectional area tool Cog3DRangeImageCrossSectionTool to obtain the contour of the position according to the caliper position, as shown in Figure 7 3) Use the ExtractPoint tool to obtain the coordinates (X2, Z2) of the edge of the workpiece; at the same time, use the ExtractLineSegment tool to obtain the line segment coordinates (X0, Z0) and (X1, Z1) of the CG centerline of workpiece 17, as shown in Figure 8 As shown; 4) Based on the acquired coordinates, calculate the perpendicular coordinates X3, Z3) from the edge position point to the straight line; the straight line here is defined by the points (X0, Z0) and (X1, Z1), and the calculation formula is as follows:

[0070] , , ,

[0071] ， ;

[0072] Assume that the height of the dispensing position is Z4, then the height difference between the dispensing position and the upper surface of the workpiece center line is During the glue dispensing process of the inner glue wall 18 and the outer glue wall 19, the edge of the workpiece 17 is 3D scanned to obtain the height Z5 of the upper surface of the workpiece 17, and the height difference Z is added to obtain the new glue dispensing height position Z4. The above calculation is used to compensate for the vertical tolerance of the workpiece 17 to ensure that the height of the glue wall meets the requirements and the longitudinal molding accuracy of the glue dam is guaranteed. The coordinates in this step are not related to the previous steps.

[0073] Preferably, before performing step S3, the surface of the workpiece 17 is cleaned by a plasma cleaning device to reduce the water drop angle, so as to improve the adhesion of the glue on the surface of the workpiece.

[0074] Preferably, before performing step S4, the surface of the workpiece 17 is cleaned again by a plasma cleaning device to increase the fluidity of the glue filling between the inner glue wall 18 and the outer glue wall 19. This increases the speed of the glue leveling in the glue wall, thereby facilitating the overall molding speed of the glue dam.

[0075] Preferably, the visual module in this case includes a CCD and a 3D camera.

[0076] The present invention has the following working principle:

[0077] First, the glue dispensing trajectory is imported through CAD to import the template information of the standard workpiece 17 and generate the template glue dispensing trajectory;

[0078] Secondly, the XY position information of the edge of the workpiece 17 is obtained by scanning the current glue dispensing workpiece 17 through the CCD, and the Z position information of the edge of the current glue dispensing workpiece 17 is scanned through the 3D camera, and the template glue dispensing trajectory is calculated and corrected through software to obtain the actual glue dispensing trajectory;

[0079] Next, the glue dispensing nozzle of the glue dispensing device is controlled to dispense the outer glue wall 19 and the inner glue wall 18 on the current glue dispensing workpiece 17 according to the actual glue dispensing trajectory and solidify them to form a glue dispensing groove on the workpiece 17;

[0080] Finally, the first glue filling is carried out. The volume of the glue dispensing groove is calculated by scanning with the visual module. The glue dispensing equipment fills the glue dispensing groove with a specified volume ratio for the first time, and waits for the glue to automatically level in the glue dispensing groove and pre-cure. Then, the glue is filled for the second time. The remaining amount of glue filled in the glue dispensing groove is calculated by scanning with the visual module again. The glue dispensing equipment is controlled to fill the glue for the second time according to the remaining amount of glue filled. The glue is left to level and then pre-cured, and finally a final curing is carried out. Figure 4 Part a in the middle is a schematic diagram of the state after the inner and outer walls are glued. Figure 4 Part b in the middle is a schematic diagram of the state after the first filling of glue; Figure 4 Part c in the middle is a schematic diagram of the state after the first filling and curing (glue shrinkage); Figure 4 Part d in the middle is a schematic diagram of the state of the first filling completion and the second filling completion obtained by 3D line scanning; Figure 4 The middle e part is a schematic diagram of a state where the workpiece 17 is slightly concave after the second curing but can be controlled within a specification of 0.05 mm. The glue dam (which can be a ring-shaped glue dam (such as a ring-shaped glue dam) surrounding the back of the entire workpiece 17 is finally formed to fit with the middle frame. Fig. 9 ), or it can be a single-sided glue dam on the back of the workpiece (as shown in Fig.12 As shown in the figure) or a multi-sided adhesive dam), the adhesive dam made by this process has a high flatness (as shown in the figure) Fig. 9 , Fig.10 and Fig.12 , Fig.13 as shown) and the glue width that meets the verticality requirements (as shown Fig. 9 , Fig.11 and Fig.12 , Fig.14 shown), Fig. 9 and Fig.12 The numbers in the figure are sampling measurement points.

[0081] Several points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, and can be mechanical or electrical connections, or internal connectivity between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change.

[0082] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the usual design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0083] Finally, the above is only a preferred implementation of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0084] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should also be regarded as within the scope of protection of the present invention.

Claims

1. A BNB dispensing process, characterized in that: The following steps are involved: Step S1, importing the dispensing track: importing the template information of the standard workpiece and generating the template dispensing track; Step S2, workpiece positioning and edge finding: Scan the current dispensing workpiece through the visual module to obtain the XYZ position information of the edge of the workpiece, and calculate and correct the template dispensing trajectory through the software to obtain the actual dispensing trajectory; Step S3, dotting the outer glue wall and the inner glue wall: dotting the outer glue wall and the inner glue wall layer by layer on the workpiece according to the actual dotting track, and solidify them to form a dotting groove on the workpiece; Step S4, perform glue filling at least twice: the first time of glue filling, calculate the volume of the glue dispensing groove through the visual module scanning, fill the glue dispensing groove with a specified volume ratio of glue for the first time through the glue dispensing equipment, let it stand and wait for the glue to automatically level in the glue dispensing groove before solidifying; the second time of glue filling, calculate the remaining glue filling amount of the glue dispensing groove through the visual module scanning again, control the glue dispensing equipment to fill the glue for the second time according to the remaining glue filling amount, let it stand and wait for the glue to level before solidifying; scan the contour of the glue dispensing groove between the inner glue wall and the outer glue wall through the visual module, and calculate the cross-sectional area S10 at each key point of the contour. The reference glue dispensing speed of a standard area S0 is V0, and the actual glue dispensing speed V1=V0 / (S10 / S0) is calculated.

2. A BNB dispensing process according to claim 1, characterized in that: In step S3, the glue used to construct the outer glue wall and the inner glue wall is a glue with high thixotropic properties; the glue dispensing equipment constructs the outer glue wall layer by layer according to the actual glue dispensing trajectory until it reaches the specified height, and solidifies during the construction process; the inner glue wall is constructed layer by layer until it reaches the specified height, and solidifies during the construction process.

3. A BNB dispensing process according to claim 2, characterized in that: In step S3, after the outer glue wall and the inner glue wall are both point-built, they are cured and shaped again.

4. A BNB dispensing process according to claim 1, characterized in that: In step S4, the amount of glue filled for the first time is 60%-90% of the total volume of the glue dispensing groove; during the second filling, the remaining amount of glue is filled into the glue dispensing groove; after the first filling of glue, the glue in the glue dispensing groove is heated to reduce the viscosity of the glue and increase the flow rate of the glue; after the second filling of glue, the glue in the glue dispensing groove is heated to reduce the viscosity of the glue and increase the flow rate of the glue.

5. A BNB dispensing process according to claim 1, characterized in that: Step S2 also includes step S21, edge-finding compensation XY position and normal offset of the glue dispensing position, moving the visual module to the glue dispensing position to take a picture to obtain an image, and placing a caliper tool in the image; step S22, obtaining the center coordinates of the edge position of the workpiece, and obtaining the center coordinates (X1, Y1) of the edge position of the workpiece by running the caliper tool; step S23, using the given caliper angle angle, glue dispensing position coordinates (X0, Y0) and workpiece edge position center coordinates (X1, Y1), calculate the normal offset VectorGap1 of the outer glue wall from the glue dispensing position coordinates to the edge of the workpiece, and the perpendicular coordinates (X2, Y2); step S24, according to the glue dispensing position coordinates (X0, Y0), the center coordinates of the edge position of the workpiece (X1, Y1) and the caliper angle angle, and the normal offset of the outer glue wall Distance VectorGap1, calculate the glue point position coordinates (X3, Y3) of the outer glue wall at the specified position; step S25, refer to step S23 and step S24, calculate the normal offset VectorGap2 of the glue point position coordinates of the inner glue wall, and calculate the glue point position coordinates (X4, Y4) of the inner glue wall, the distance between the inner glue wall and the outer wall is VectorGap2-VectorGap1; step S26, by scanning the edge of the workpiece, extract the new edge position (X5, Y5), and then according to the deviation (X, Y) between the center coordinates of the edge position of the workpiece (X5, Y5) and the center coordinates of the edge position of the template workpiece (X1, Y1), obtain the new inner glue wall glue point position coordinates (X6, Y6) and the new outer glue wall glue point position coordinates (X7, Y7); , ; , ; thereby compensating the XY tolerance of the workpiece; step S27, measuring and compensating the Z coordinate tolerance of the edge of the workpiece.

6. A BNB dispensing process according to claim 5, characterized in that: In step S23, the normal offset VectorGap1 is calculated according to the straight line equation , calculate the slope of the line , ,intercept ; Calculate the angle of the normal angle0: If angle0 is less than -π, then , if angle0 is greater than π, then ; According to the value of angle0 and the center coordinates of the workpiece edge position (X1, Y1), calculate VectorGap1: ； Calculate the coordinates of the perpendicular (X2, Y2): , ; Determine the sign of VectorGap1 based on the quadrant of angle0 and the relative positions of (X1, Y1) and (X2, Y2): If angle0 is in the first or fourth quadrant and X1 ≥ X2, then VectorGap1 is positive; if angle0 is in the first or fourth quadrant and X1 < X2, then VectorGap1 is negative; if angle0 is in the second or third quadrant and X1 ≥ X2, then VectorGap1 is negative; if angle0 is in the second or third quadrant and X1 < X2, then VectorGap1 is positive; if angle0 = -π / 2 and y1 ≥ y2, then VectorGap1 is negative, otherwise it is positive; if angle0 = -π and x1 ≥ x2, then VectorGap1 is negative, otherwise it is positive; if angle0 = π / 2 and y1 ≥ y2, then VectorGap1 is positive, otherwise it is negative; if angle0 = 0 and x1 ≥ x2, then VectorGap1 is positive, otherwise it is negative; In step S24, calculate the dispensing position coordinates (X3, Y3) of the outer glue wall at the specified position according to the normal offset VectorGap1: ， ， ， ， ， ， 。 7. A BNB dispensing process according to claim 6, characterized in that: In step S27, use a point-finding tool to obtain the coordinates (X2, Z2) of the workpiece edge position; at the same time, use a line-finding tool to obtain the line segment coordinates (X0, Z0) and (X1, Z1) of the workpiece center line position; according to the obtained coordinates, calculate the foot coordinates (X3, Z3) of the edge position point to the line, and the calculation formula is as follows: ， ， ， ， ； Assume that the height of the dispensing position is Z4, then the height difference between the dispensing position and the upper surface of the workpiece center line is During the glue dispensing process of the inner and outer glue walls, a 3D scan is performed on the edge of the workpiece to obtain the height Z5 of the upper surface of the workpiece, and then the height difference Z is added to obtain the new glue dispensing height position Z4.

8. A BNB dispensing process according to claim 1, characterized in that: Before performing step S3, first clean the surface of the workpiece through a plasma cleaning device to reduce the water contact angle.

9. A BNB dispensing process according to claim 1, characterized in that: Before performing step S4, first clean the surface of the workpiece again through a plasma cleaning device to increase the fluidity of the glue filled between the inner glue wall and the outer glue wall.

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