Glass substrate side edge right angle testing device and polishing precision adjustment method

Abstract

The present application relates to the technical field of glass substrate side edge grinding, and particularly discloses a glass substrate side edge right angle testing device and a grinding precision adjusting method. The glass substrate side edge right angle testing device comprises a substrate arranged in a measuring groove and a dial gauge mounted on the substrate. Positioning points A and B are arranged on one side edge of the measuring groove. Positioning points C and D are arranged on the substrate and located at the bottom of the measuring groove and on the same straight line with the axis. The straight line formed by the positioning points C and D is parallel to the bottom edge of the measuring groove. In a free state, the telescopic end of the dial gauge extends into the measuring groove. The present application can effectively control the right angle of the glass substrate side edge, thereby controlling the uniformity of the single-side grinding amount, and greatly improving the grinding efficiency and grinding quality of the four side edges of the glass substrate.

Description

Technical Field

[0001] This invention relates to the field of glass substrate side grinding technology, and more specifically, to a glass substrate side right angle testing device and a grinding accuracy adjustment method. Background Technology

[0002] TFT-LCD glass substrates are brittle and fragile materials, making them difficult to process. Precise positioning is required on all four sides of the glass substrate before fine grinding. The right angle of the glass substrate directly reflects how close the four sides are to a rectangle after grinding. Theoretically, the smaller the right angle, the more uniform the grinding amount on one side, and the better the grinding quality.

[0003] After hot-end forming, the semi-finished TFT-LCD glass substrate undergoes a series of processes to meet downstream quality requirements. These processes include fine scribing, cleaving, precision edge grinding and polishing, surface cleaning, and quality inspection before packaging. The quality of edge grinding directly impacts the subsequent performance of the glass substrate. After scribing and cleaving, the edges of the glass substrate are relatively sharp, and residual stress at the edges makes it prone to breakage during subsequent processing. It must be corrected using a positioning system and polished on all four sides before proceeding to the next process. However, the edges of the scribing and cleaving glass substrate are not ideally rectangular, and glass substrates are brittle materials, making fine edge grinding extremely difficult. In actual processing, it has been found that the smaller the grinding amount, the higher the precision requirement of the grinding equipment; excessive grinding amount results in poor surface quality and defects such as edge burning, chipping, cracks, and even breakage. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a glass substrate side right angle testing device and a grinding accuracy adjustment method, which can effectively control the right angle of the glass substrate after edge grinding to within ±0.01mm when the side length of the glass substrate is about 1000mm, and the uniformity of the grinding amount on one side is good, which significantly improves the yield of glass substrate edge grinding.

[0005] The solution adopted by this invention to solve the technical problem is:

[0006] on the one hand:

[0007] This invention discloses a device for testing the right angle of the side edge of a glass substrate, comprising a substrate and a dial indicator mounted on the substrate; positioning points A, B, C, and D are provided on the substrate, wherein the axis connecting positioning points A and B forms a straight line A, and the axis connecting positioning points C and D forms a straight line B. Straight lines A and B are perpendicular to each other and cooperate with the side edge of the substrate to form a measuring groove. The dial indicator is mounted on positioning point A, and the axis of its telescopic rod is parallel to straight line B; the telescopic rod of the dial indicator extends into the measuring groove in a free state.

[0008] The dial indicator is positioned horizontally and parallel to the bottom edge of the measuring groove; in its free state, the telescopic end of the dial indicator extends into the measuring groove.

[0009] on the other hand,

[0010] This invention also discloses a method for adjusting the grinding precision of a glass substrate, based on the glass substrate side right angle testing device described above, specifically including the following steps:

[0011] Step S1: Place a glass substrate into the grinding equipment for positioning and grinding, and determine the initial positioning of the grinding positioning table on the glass substrate;

[0012] Step S2: Take another glass substrate and place it on the right-angle testing device. Test the left and right sides of the glass substrate inside the right-angle testing device. At this time, the dial indicator reading is 'a'. Based on the reading 'a', obtain the right-angle values ​​of the left and right sides of the glass substrate relative to the bottom edge of the glass substrate.

[0013] Step S3: Horizontally transfer the glass substrate from step S2 to the rotary grinding table for grinding on both sides, and then remove the glass substrate.

[0014] Step S4: Using the glass substrate from step S3 as the basis for judgment, place it in the right angle testing device for measurement to obtain the measurement value b. Use the measurement value b to determine the uniformity of the grinding amount on the left and right sides of the glass substrate.

[0015] Step S5: Adjust the grinding positioning table by rotating it according to the measured value b. If the measured value b is positive, rotate it counterclockwise; if the measured value b is negative, rotate it clockwise; verify.

[0016] Step S6: Take another glass substrate and grind its four sides using the adjusted grinding positioning table; repeat step S2 on this glass substrate, and the dial indicator will generate a reading c, which will give the right angle values ​​of the left and right sides of the glass substrate relative to the bottom edge of the glass substrate.

[0017] Step S7: Based on the reading c, determine the grinding amount at positioning points C and D, rotate and adjust the grinding table, and the adjustment is complete;

[0018] Step S8: Take another glass substrate with all four sides ground and verify it.

[0019] In some possible implementations,

[0020] Step S2 specifically includes the following steps:

[0021] Step S21: Take out a new glass substrate that has been scribing and split, and mark the upper right corner of the glass substrate.

[0022] Step S22: Place the glass substrate in the measuring groove, and gently place the bottom edge of the glass substrate on positioning points C and D. The distance between the side of the glass substrate closest to positioning point B and positioning point B is g.

[0023] Step S23: Move the glass substrate. When the glass substrate and positioning point B are close to each other on one side, the free end of the telescopic rod will contact that side of the glass substrate, and the dial indicator will generate a reading.

[0024] Step S24: Zero the dial gauge reading and flip the glass substrate. After flipping, the bottom edge of the glass substrate is located at positioning point C and positioning point D. Control the distance between positioning point B and the side of the glass substrate that is close to each other to be g.

[0025] Step S25: Control the glass substrate to move towards positioning point B until it touches positioning point B. At this time, the dial indicator reading is 'a', and the right angle values ​​of the left and right sides of the glass substrate relative to the bottom side of the glass substrate can be obtained.

[0026] In some possible implementations,

[0027] Step S3 specifically refers to:

[0028] The flipped glass substrate is restored and placed into the grinding equipment, and positioned by the grinding positioning unit;

[0029] The positioned glass substrate is horizontally transferred to a rotary grinding table for grinding on both sides, and then the glass substrate is removed.

[0030] In some possible implementations,

[0031] Specifically, step S4 refers to measuring the glass substrate according to step S2, based on the positioning angle before the substrate is flipped.

[0032] In some possible implementations,

[0033] The review in step S5 refers to:

[0034] Take a glass substrate and repeat steps S21-23 to zero the dial gauge reading.

[0035] After the glass substrate is placed inside the grinding equipment, it is positioned by the grinding positioning table. After positioning, the glass substrate is horizontally transferred to the rotary grinding table. The left and right sides of the glass substrate are ground, and then the glass substrate is removed.

[0036] Repeat steps S21-S23 on the glass substrate;

[0037] If the dial indicator reading is 0, the grinding positioning worktable is in place.

[0038] In some possible implementations,

[0039] Step S6 specifically includes the following steps:

[0040] Repeat step S2 on the glass substrate. This time, the dial indicator will generate a reading c, which indicates the perpendicularity of the left and right sides of the glass substrate relative to the bottom edge.

[0041] Step S61: Take a glass substrate and grind its four sides based on the adjusted grinding and positioning worktable; place the bottom of the glass substrate in the measuring groove, at which point the bottom edge of the glass substrate is placed on positioning point C and positioning point D, and the distance between the glass substrate and positioning point B on the side closest to each other is g.

[0042] Step S62: Move the glass substrate. When the glass substrate and positioning point B come into contact with each other on one side, the free end of the telescopic rod will contact that side of the glass substrate, and the dial indicator will generate a reading.

[0043] Step S63: Set the reading to zero and flip the glass substrate. After flipping, the bottom edge of the glass substrate is located at positioning point C and positioning point D. Control the distance between positioning point B and the side of the glass substrate that is close to each other to be g.

[0044] Step S64: Control the glass substrate to move towards positioning point B until it touches positioning point B. At this time, the dial indicator reading is c. Calculate the right angle values ​​of the left and right sides of the glass substrate relative to the bottom side of the glass substrate.

[0045] In some possible implementations,

[0046] Step S8 specifically refers to:

[0047] Take a glass substrate with the marking lines and grind its four sides based on the adjusted grinding positioning table and grinding table.

[0048] After grinding, repeat step S2. The dial gauge reading is d. If d = a, the grinding amount on the bottom edge of the glass substrate is consistent with the linearity of the bottom edge of the scribing glass substrate.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0050] This invention can effectively control the right angle of the glass substrate side, thereby controlling the uniformity of the grinding amount on one side; greatly improving the grinding efficiency and grinding quality of the four sides of the glass substrate.

[0051] This invention can control the straightness of the glass substrate after edge grinding to within ±0.01mm when the side length of the glass substrate is about 1000mm. It also achieves good control over the uniformity of the grinding amount on one side of the glass substrate, effectively solving the problems of difficult processing and even more difficult precision processing of TFT-LCD glass substrates, and significantly improving the grinding efficiency and grinding yield. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the glass substrate side right angle testing device in this invention;

[0053] Among them, 1. substrate; 2. dial gauge. Detailed Implementation

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] The present invention will now be described in detail.

[0056] like Figure 1As shown, a glass substrate side right angle testing device includes a substrate 1 and a dial indicator 2 mounted on the substrate 1. Positioning points A, B, C, and D are provided on the substrate 1. The axis connecting positioning points A and B forms a straight line A, and the axis connecting positioning points C and D forms a straight line B. Straight lines A and B are perpendicular to each other and cooperate with the side of the substrate 1 to form a measuring groove. The dial indicator 2 is mounted on positioning point A, and the axis of its telescopic rod is parallel to straight line B. The telescopic rod of the dial indicator 2 extends into the measuring groove in a free state. Preferably, the length of the free end of the telescopic rod extending into the measuring groove in a free state is 1 mm.

[0057] Preferably, the measuring groove has a rectangular structure, which is compatible with the glass substrate in the prior art.

[0058] Percentage 2 represents existing products that can be purchased directly from the market and assembled.

[0059] A method for adjusting the grinding precision of a glass substrate, based on a right-angle testing device, specifically includes the following steps:

[0060] Step S1: Place a glass substrate into the grinding equipment for positioning and grinding, and determine the initial positioning of the grinding positioning table on the glass substrate;

[0061] Step S2: Take another glass substrate and place it on the right angle testing device. Test the left and right sides of the glass substrate inside the right angle testing device. At this time, the reading of dial gauge 2 is a.

[0062] Based on reading a, the perpendicularity values ​​of the left and right sides of the glass substrate relative to the bottom side of the glass substrate are obtained.

[0063] Step S2 specifically includes the following steps:

[0064] Step S21: Take out a new glass substrate that has been scribing and split, and mark the upper right corner of the glass substrate.

[0065] Step S22: Place the glass substrate in the measuring groove, and gently place the bottom edge of the glass substrate on positioning points C and D. The distance between the side of the glass substrate near positioning point B and positioning point B is g; preferably, g is 8-15 mm.

[0066] Step S23: Move the glass substrate. When the glass substrate and the positioning point B are close to each other on one side, the free end of the telescopic rod will first contact the side of the glass substrate and be squeezed by the glass substrate. The dial gauge 2 will generate a reading.

[0067] Step S24: Zero the reading of dial gauge 2 in step S3, and flip the glass substrate. After flipping, the bottom edge of the glass substrate is located on positioning point C and positioning point D. The upper right corner before flipping will become the upper left corner. Control the distance between positioning point B and the side of the glass substrate that is close to each other to be g.

[0068] Step S25: Control the glass substrate to move towards positioning point B until it touches positioning point B. At this time, the dial indicator 2 reads a, and the right angle values ​​of the left and right sides of the glass substrate relative to the bottom side of the glass substrate can be obtained.

[0069] Step S26: Remove the glass substrate from the measuring slot and flip it back to its original position. The positioning angle after restoration is the upper right corner.

[0070] Step S3: Horizontally transfer the restored glass substrate from step S26 to a rotary polishing table for polishing the left and right sides, and then remove the glass substrate.

[0071] Step S3 specifically refers to:

[0072] The flipped glass substrate is restored and placed into the grinding equipment, and positioned by the grinding positioning unit;

[0073] The positioned glass substrate is horizontally transferred to a rotary grinding table for grinding on both sides, and then the glass substrate is removed.

[0074] This grinding process only targets the left and right sides of the glass substrate, in order to reduce the impact of grinding variables on the measurement values ​​on the left side.

[0075] Step S4: Using the glass substrate from step S3 as the basis for judgment, place it in the right angle testing device for measurement to obtain the measurement value b. Use the measurement value b to determine the uniformity of the grinding amount on the left and right sides of the glass substrate.

[0076] Step S4 specifically refers to: using the positioning angle of the glass substrate before flipping as the basis for judgment, measuring it according to step S2; the positioning angle of the glass substrate before flipping described here is the upper right corner.

[0077] Step S5: Adjust the grinding positioning table by rotating it according to the measured value b. If the measured value b is positive, rotate it counterclockwise; if the measured value b is negative, rotate it clockwise; verify.

[0078] The review in step S5 refers to:

[0079] Take a glass substrate and repeat steps S21-23 to zero the reading of dial indicator 2.

[0080] After the glass substrate is placed inside the grinding equipment, it is positioned by the grinding positioning table. After positioning, the glass substrate is horizontally transferred to the rotary grinding table. The left and right sides of the glass substrate are ground, and then the glass substrate is removed.

[0081] Repeat steps S21-S23 on the glass substrate;

[0082] If the dial indicator 2 reads 0, the grinding positioning worktable is in place.

[0083] Step S6: Take another glass substrate and grind its four sides using the adjusted grinding positioning table; repeat step S2 on this glass substrate, and dial indicator 2 will generate a reading c, which will give the right angle values ​​of the left and right sides of the glass substrate relative to the bottom edge of the glass substrate.

[0084] Step S6 specifically includes the following steps:

[0085] Step S61: Take a glass substrate and grind its four sides based on the adjusted grinding and positioning worktable; place the bottom of the glass substrate in the measuring groove, at which point the bottom edge of the glass substrate is placed on positioning point C and positioning point D, and the distance between the glass substrate and positioning point B on the side closest to each other is g.

[0086] Step S62: Move the glass substrate. When the glass substrate and positioning point B are close to each other on one side, the free end of the telescopic rod will contact that side of the glass substrate, and the dial indicator 2 will generate a reading.

[0087] Step S63: Set the reading to zero and flip the glass substrate. After flipping, the bottom edge of the glass substrate is located at positioning point C and positioning point D. Control the distance between positioning point B and the side of the glass substrate that is close to each other to be g.

[0088] Step S64: Control the glass substrate to move towards positioning point B until it touches positioning point B. At this time, the dial indicator 2 reads c, and the right angle values ​​of the left and right sides of the glass substrate relative to the bottom side of the glass substrate are obtained.

[0089] Step S7: Based on the reading c, determine the grinding amount at positioning points C and D, rotate and adjust the grinding table, and the adjustment is complete;

[0090] The adjustment of the grinding table involves existing equipment, and this invention does not involve any improvement to this adjustment device.

[0091] Step S8: Take another glass substrate with all four sides ground and verify it.

[0092] Step S8 specifically refers to:

[0093] Take a glass substrate with the marking lines and grind its four sides based on the adjusted grinding positioning table and grinding table.

[0094] After grinding, repeat step S2. The reading of dial gauge 2 is d. If d = a, the grinding amount on the bottom edge of the glass substrate is consistent with the linearity of the bottom edge of the scribing glass substrate.

[0095] Example 1:

[0096] This embodiment describes a method for adjusting the grinding accuracy of a glass substrate based on a right-angle testing device, specifically including the following steps:

[0097] like Figure 1 As shown,

[0098] (1) Take the glass substrate after scribing and splitting, and mark the upper right corner as the positioning angle; the main function of marking the positioning angle is to distinguish the front and back of the glass substrate and place the glass substrate into the grinding equipment for positioning.

[0099] The marked glass substrate is transferred to the next process for grinding its left and right sides. By adjusting the grinding parameters, it is ensured that the cross-section of the glass substrate on both sides is ground. The purpose is to use a right angle measuring device to more accurately measure the right angle of the left and right sides of the glass substrate, and at the same time judge the positioning effect of the grinding positioning table on the glass substrate.

[0100] (2) After confirming that the left and right sides of the glass substrate have been polished, take out a new glass substrate that has been scribed and split, and mark the positioning angle at the upper right corner of the glass substrate.

[0101] (3) Gently place the glass substrate on the right angle testing device. The right angle testing device requires that when the telescopic rod of dial gauge 2 at positioning point A is in its natural state, the end of the telescopic rod near the measuring groove should extend into the measuring groove about 1 mm further than the side of positioning point B that is closer to the measuring groove. Positioning point C should be kept horizontal. At this time, the upper right corner of the glass substrate is the positioning angle, the back of the glass substrate is in close contact with the bottom of the measuring groove, and the lower edge of the glass substrate is gently placed on positioning points C and D. Its left side is 10 mm away from positioning point B.

[0102] (4) Place your right palm on the lower edge of the glass substrate near the middle area and gently slide the glass substrate toward the positioning point B until it slightly touches the positioning point B. Because the positioning point A is equipped with a dial indicator 2 with a telescopic rod, when the left side of the glass substrate touches the positioning point B, the right end of the telescopic rod at the positioning point A will touch the left side of the glass substrate in advance. At this time, the dial indicator 2 will generate a reading. Then, reset the reading of the dial indicator 2 to zero. The purpose of resetting it to zero is to assume that the left side of the glass substrate and the bottom side of the glass substrate are right angles at this time, so as to use it as a reference for subsequent measurements.

[0103] (5) Flip the glass substrate over so that the positioning angle marked on the glass substrate is about to be at the upper left corner. The front of the glass substrate should be close to the bottom of the measuring groove. Place the bottom edge of the glass substrate lightly on positioning points C and D. The left side of the glass substrate should be 10mm away from positioning point B. Place your right palm on the lower edge of the glass substrate near the middle area and gently slide the glass substrate towards positioning point B until it slightly touches positioning point B. At this time, dial indicator 2 will generate a reading a (e.g., +0.2mm or -0.2mm). It refers to the right angle between the left and right sides of the glass substrate and the bottom edge of the glass substrate.

[0104] Place your right palm on the lower edge of the glass substrate near the center, and slowly and evenly slide the glass substrate away from positioning point B for a distance until the left side of the glass substrate no longer touches the extension rod of dial indicator 2 at positioning point A. This is to prevent measurement errors caused by shaking the extension rod of dial indicator 2 when removing the substrate. Flip the glass substrate back to its original position, so that the positioning angle of the glass substrate after restoration is the upper right corner. After this, you must not touch dial indicator 2 or its extension rod at positioning point A again.

[0105] (6) Place the glass substrate after flipping and restoring (the glass substrate is positioned at the upper right corner) into the grinding equipment, and use the automatic positioning of the grinding positioning table to transfer the positioned glass substrate horizontally to the rotary grinding table. Only grind the left and right sides of the glass substrate and then manually remove the glass substrate. The purpose of only grinding the left and right sides is to reduce the influence of the grinding variables on the lower side of the glass substrate on the measurement value of the left side.

[0106] (7) Using the positioning angle mark of this glass substrate in the upper right corner as the basis for judgment, gently place the glass substrate on the right angle test device for measurement according to steps (3) and (4);

[0107] (8) Accurately read and record the readings of dial gauge 2, paying attention to positive and negative values;

[0108] In step (5), dial gauge 2 has been zeroed. Using this as a reference, the uniformity of the single-sided grinding amount on the left and right sides of the glass substrate is judged based on the measured value b at this time (such as +0.2mm or -0.2mm).

[0109] (9) Since the grinding stations on the left and right sides of the glass substrate are connected by the same gantry, the left and right sides move in parallel in the same horizontal direction during grinding. Based on the reading b of dial indicator 2, determine whether the grinding amount of positioning point A on the left side of the glass substrate is more or less than that of positioning point B. If the reading is +0.2mm, it means that positioning point A on the left side is ground 0.2mm less than positioning point B (similarly, the right side corresponding to the horizontal position of positioning point A is ground 0.2mm more than the right side corresponding to the horizontal position of positioning point B). If the reading is -0.2mm, it means that positioning point A is ground 0.2mm more than positioning point B (the right side corresponding to the horizontal position of positioning point A is ground 0.2mm less than the right side corresponding to the horizontal position of positioning point B).

[0110] (10) Use the upper right corner of the glass substrate as a mark to distinguish the front and back sides of the glass substrate. Ensure that the four sides of the glass substrate corresponding to the edge grinding positioning unit are consistent with the four sides of the glass substrate when measured on the right angle testing device. Determine and adjust the rotation direction of the edge grinding positioning unit according to the positive or negative reading. For example, if it is +0.2mm, it means that positioning point A is ground 0.2mm less than positioning point B. Near positioning point A on the grinding positioning worktable, rotate the grinding positioning worktable unit counterclockwise by 0.2mm to complete the uniformity adjustment of the grinding amount on the left and right sides of the glass substrate. Theoretically, after the positioning worktable is rotated counterclockwise by 0.2mm, the glass substrate adsorbed on the grinding positioning worktable will also be rotated counterclockwise by 0.2mm after positioning. In the subsequent grinding of the left and right sides, the uniformity problem of the grinding amount of positioning point A and positioning point B can be effectively solved. Conversely, if the measured value is -0.2mm, the positioning unit needs to be rotated clockwise by 0.2mm using the above method to ensure the consistency of the grinding amount of positioning point A and positioning point B.

[0111] (11) Reconfirm the adjustment effect of the grinding positioning table: Take another glass substrate, mark the upper right corner, and gently place it on the right angle testing device. The back of the glass substrate should be close to the bottom of the measuring groove. The lower edge of the glass substrate should be gently placed on positioning points C and D. The left side should be 10mm away from positioning point B. Use your right palm to hold the lower edge of the glass substrate near the middle area and gently slide the glass substrate towards positioning point B until it slightly touches positioning point B. Manually reset the reading generated by dial indicator 2 to zero. Place the glass substrate (positioning angle is the upper right corner) into the grinding equipment and position it using the grinding positioning table. After the glass substrate is horizontally transferred to the rotary grinding table, only the left and right sides are ground. Then the glass substrate is removed and the reverse side of the glass substrate is placed close to the bottom of the measuring groove. The bottom edge of the glass substrate is gently placed on positioning points C and D (the positioning angle of the glass substrate is the upper right corner). The left side is 10mm away from positioning point B. With the palm of your right hand, place the lower edge of the glass substrate near the middle area and gently slide the glass substrate towards positioning point B until it slightly touches positioning point B. If the reading of dial indicator 2 is 0, it means that the adjustment effect of the grinding positioning table is good and the uniformity of the grinding amount on the left and right sides of the glass substrate has basically reached the ideal state.

[0112] (12) After the right angle of the left and right sides of the glass substrate is adjusted, place a glass substrate after scribing and splitting, and position it on the grinding positioning worktable before grinding - transfer it horizontally to the rotary grinding worktable - grind the left and right sides - rotate the grinding worktable counterclockwise by 90° (rotation angle is adjustable) - transfer it horizontally to the grinding worktable on the lower side of the upper glass substrate - grind the lower side of the glass substrate - take it out.

[0113] After marking the upper right corner, gently place the glass substrate on the perpendicularity testing device. The reverse side of the glass substrate should be pressed firmly against the bottom of the measuring groove. The bottom edge of the glass substrate should be gently placed on positioning points C and D, with the left edge 10mm from positioning point B. With your right palm against the middle area of ​​the lower edge of the glass substrate, gently slide the glass substrate towards positioning point B until it lightly touches point B. Manually zero the reading generated by dial indicator 2. Flip the glass substrate over. The positioning angle marked on the glass substrate is now the upper left corner. The front side of the glass substrate should be pressed firmly against the bottom of the measuring groove. The bottom edge of the glass substrate should be gently placed on positioning points C and D, with the left edge 10mm from positioning point B. With your right palm against the middle area of ​​the lower edge of the glass substrate, gently slide the glass substrate towards positioning point B until it lightly touches point B. At this point, dial indicator 2 will generate a reading c (e.g., +0.2mm or -0.2mm). This refers to the perpendicularity of the left and right sides of the glass substrate relative to the bottom edge. Since the grinding amount on the left and right sides of the glass substrate has been adjusted to the ideal state using the grinding positioning table, and because the grinding stations on the bottom edge of the glass substrate are connected to the same gantry, the bottom edge of the glass substrate moves almost parallel in the same horizontal direction during grinding. At this point, the grinding amount at positioning points C and D can be determined based on the sign and magnitude of the value of c. For example, if the reading is +0.2mm, it means that positioning point C on the bottom edge of the glass substrate is ground 0.2mm more than positioning point D; that is, the upper edge perpendicular to positioning point C is ground 0.2mm less than the upper edge perpendicular to positioning point D. If the reading is -0.2mm, it means that the lower edge positioning point C of the glass substrate is ground 0.2mm less than the positioning point D. That is, the upper edge corresponding to the vertical position of positioning point C is ground 0.2mm more than the upper edge corresponding to the vertical position of positioning point D. Keep the grinding positioning table in the same state, and adjust the rotation angle of the grinding table by the value of c. For example, +0.2mm means rotating the table counterclockwise 0.2° less, and -0.2mm means rotating the table counterclockwise 0.2° more. This method can effectively solve the problem of uniform grinding amount on the lower edge of the glass substrate.

[0114] (13) Take another glass substrate that has been properly ground on all four sides. Mark the upper right corner in the same way and place it gently on the right angle test device. The back of the glass substrate should be close to the bottom of the measuring groove. Place the bottom edge of the glass substrate on positioning point C and positioning point D. The left side should be 10mm away from positioning point B. Use your right palm to hold the lower edge of the glass substrate near the middle area and gently slide the glass substrate toward positioning point B until it slightly touches positioning point B. Manually reset the reading generated by dial indicator 2 to zero at this time.

[0115] Flip the glass substrate over so that the positioning angle marked on the glass substrate is the upper left corner. Place the front of the glass substrate against the bottom of the measuring groove. Gently place the lower edge of the glass substrate on positioning points C and D. The left side is 10mm away from positioning point B. Place your right palm on the lower edge of the glass substrate near the middle area and gently slide the glass substrate toward positioning point B until it slightly touches positioning point B. At this time, dial indicator 2 will generate a reading d. If the d value is the same as the a value, it means that the grinding amount on the lower edge of the glass substrate is basically consistent and is linearly consistent with the lower edge of the scribing glass substrate.

[0116] Through the above adjustment methods, the straightness of the TFT-LCD glass substrate after edge grinding can be controlled within ±0.01mm when the side length of the glass substrate is about 1000mm. The uniformity of the grinding amount on one side of the glass substrate is well controlled, which effectively solves the characteristics of TFT-LCD glass substrate being difficult to process and even more difficult to refine, and significantly improves the edge grinding efficiency and edge grinding yield.

[0117] The grinding positioning worktable, grinding worktable and grinding equipment in this invention are all existing technologies, and their internal structures will not be described in detail.

[0118] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method for adjusting the grinding precision of a glass substrate, characterized in that, The glass substrate side right angle testing device includes a substrate and a dial indicator mounted on the substrate. Positioning points A, B, C, and D are provided on the substrate. The axis connecting positioning points A and B forms line A, and the axis connecting positioning points C and D forms line B. Lines A and B are perpendicular to each other and cooperate with the side edge of the substrate to form a measuring groove. The dial indicator is mounted on positioning point A, and the axis of its telescopic rod is parallel to line B. The telescopic rod of the dial indicator extends into the measuring groove in a free state. Specifically, the following steps are included: Step S1: Place a glass substrate into the grinding equipment for positioning and grinding, and determine the initial positioning of the grinding positioning table on the glass substrate; Step S2: Take another glass substrate and place it on the right-angle testing device. Test the left and right sides of the glass substrate inside the right-angle testing device. At this time, the dial indicator reading is 'a'. Based on the reading 'a', obtain the right-angle values ​​of the left and right sides of the glass substrate relative to the bottom edge of the glass substrate. ; Step S3: Horizontally transfer the glass substrate from step S2 to the rotary grinding table for grinding on both sides, and then remove the glass substrate. Step S4: Using the glass substrate from step S3 as the basis for judgment, place it in the right angle testing device for measurement to obtain the measurement value b. Use the measurement value b to determine the uniformity of the grinding amount on the left and right sides of the glass substrate. Step S5: Adjust the grinding positioning table by rotating it according to the measured value b. If the measured value b is positive, rotate it counterclockwise; if the measured value b is negative, rotate it clockwise; verify. Step S6: Take another glass substrate and grind its four sides using the adjusted grinding positioning table; repeat step S2 on this glass substrate, and the dial indicator will generate a reading c, which will give the right angle values ​​of the left and right sides of the glass substrate relative to the bottom edge of the glass substrate. ; Step S7: Based on the reading c, determine the grinding amount at positioning points C and D, rotate and adjust the grinding table, and the adjustment is complete; Step S8: Take another glass substrate with all four sides ground and verify it.

2. The method for adjusting the grinding precision of a glass substrate according to claim 1, characterized in that, Step S2 specifically includes the following steps: Step S21: Take out a new glass substrate that has been scribing and split, and mark the upper right corner of the glass substrate. Step S22: Place the glass substrate in the measuring groove, and gently place the bottom edge of the glass substrate on positioning points C and D. The distance between the side of the glass substrate closest to positioning point B and positioning point B is g. Step S23: Move the glass substrate. When the glass substrate and positioning point B are close to each other on one side, the free end of the telescopic rod will contact that side of the glass substrate, and the dial indicator will generate a reading. Step S24: Zero the dial gauge reading and flip the glass substrate. After flipping, the bottom edge of the glass substrate is located at positioning point C and positioning point D. Control the distance between positioning point B and the side of the glass substrate that is close to each other to be g. Step S25: Control the glass substrate to move towards positioning point B until it touches positioning point B. At this time, the dial indicator reading is 'a', and the right angle values ​​of the left and right sides of the glass substrate relative to the bottom side of the glass substrate can be obtained. .

3. The method for adjusting the grinding precision of a glass substrate according to claim 1, characterized in that, Step S3 specifically refers to: The flipped glass substrate is restored and placed into the grinding equipment, and positioned by the grinding positioning unit; The positioned glass substrate is horizontally transferred to a rotary grinding table for grinding on both sides, and then the glass substrate is removed.

4. The method for adjusting the grinding precision of a glass substrate according to claim 3, characterized in that, Specifically, step S4 refers to measuring the glass substrate according to step S2, based on the positioning angle before the substrate is flipped.

5. The method for adjusting the grinding precision of a glass substrate according to claim 3, characterized in that, The review in step S5 refers to: Take a glass substrate and repeat steps S21-23 to zero the dial gauge reading. After the glass substrate is placed inside the grinding equipment, it is positioned by the grinding positioning table. After positioning, the glass substrate is horizontally transferred to the rotary grinding table. The left and right sides of the glass substrate are ground, and then the glass substrate is removed. Repeat steps S21-S23 on the glass substrate; If the dial indicator reading is 0, the grinding positioning worktable is in place.

6. The method for adjusting the grinding precision of a glass substrate according to claim 5, characterized in that, Step S6 specifically includes the following steps: Step S61: Take a glass substrate and grind its four sides based on the adjusted grinding and positioning worktable; place the bottom of the glass substrate in the measuring groove, at which point the bottom edge of the glass substrate is placed on positioning point C and positioning point D, and the distance between the glass substrate and positioning point B on the side closest to each other is g. Step S62: Move the glass substrate. When the glass substrate and positioning point B are close to each other on one side, the free end of the telescopic rod will contact that side of the glass substrate, and the dial indicator will generate a reading. Step S63: Zero the reading and flip the glass substrate. After flipping, the bottom edge of the glass substrate is located at positioning point C and positioning point D. Control the distance between positioning point B and the side of the glass substrate that is close to each other to be g. Step S64: Control the glass substrate to move towards positioning point B until it touches positioning point B. At this time, the dial indicator reading is c, and the right angle values ​​of the left and right sides of the glass substrate relative to the bottom side of the glass substrate are obtained. .

7. The method for adjusting the grinding precision of a glass substrate according to claim 6, characterized in that, Step S8 specifically refers to: Take a glass substrate with the marking lines and grind its four sides based on the adjusted grinding positioning table and grinding table. After grinding, repeat step S2. The dial gauge reading is d. If d = a, the grinding amount on the bottom edge of the glass substrate is consistent with the linearity of the bottom edge of the scribing glass substrate.

Images