Porous molten glass polishing method based on swing stirring

Abstract

The invention relates to the technical field of mobile phone glass processing, and discloses a perforated glass liquid polishing method based on swing stirring, which comprises the following steps: S1, preparing an acid liquid polishing agent with a preset concentration in a pickling tank; s2, loading the perforated glass by adopting a clamp, and immersing the glass in the acid liquid polishing agent in the pickling tank; and S3, the clamp is driven to move, so that the glass with the holes translates along the circumferential path in the vertical plane at a constant speed along with the clamp. According to the liquid polishing method for the perforated glass, the perforated glass moves in the vertical plane, so that the flow state of the acid liquid polishing agent around the hole site on the glass is improved, the flow direction of the acid liquid polishing agent around the hole site is uniformly changed, and the corrosion conditions around the hole site are similar everywhere; therefore, the flow mark problem caused by acid polishing around the hole site is solved, the product appearance is ensured, and the yield of the acid polishing operation of the glass with the hole is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mobile phone glass processing, in particular to a method for polishing porous glass liquid based on swing stirring. Background Art

[0002] During the processing of mobile phone glass, such as the back cover glass, in response to the requirements of the mobile phone's appearance, through holes need to be processed on the glass to meet the needs of mobile phone cameras, etc. For the processing of such perforated glass, subsequent cleaning, polishing and other processes are required to achieve the requirements of glass surface smoothness and appearance without defects. Common cleaning methods in the industry include ultrasonic cleaning and flat plate cleaning, and common polishing methods include mechanical polishing and chemical polishing; it is difficult to completely remove the residual dust at the through hole using ultrasonic cleaning, and the operation difficulty and operation cost of flat plate cleaning are relatively high. Mechanical polishing usually uses a polishing disc to press down on the glass substrate for rotation, and polishing liquid and abrasives are used for cutting and etching to achieve the purpose of polishing and thinning. However, the cost of mechanical polishing is high, and it is sometimes not suitable for use in the processing process. Therefore, the industry currently mainly uses chemical polishing to polish the glass surface.

[0003] Chemical polishing usually uses chemical agents that are corrosive to glass to corrode the glass. Commonly used agents include alkaline agents such as KOH and NaOH, or HF, HNO 3 Acidic agents such as alkali solution, among which alkali solution corrodes glass slowly, while HF can corrode glass uniformly and is more universal. The method of acid polishing glass has low operation cost, fast threading, and can remove dust at the same time. However, the common acid polishing process in the industry is difficult to adapt to the polishing needs of porous glass. After acid polishing, the glass has depressions around the holes, and the center of the depression is obviously deviated from the center of the hole, which causes flow marks on the opening of the glass, thus affecting the appearance of the product. Summary of the invention

[0004] Based on this, it is necessary to provide a method for polishing porous glass liquid based on swinging stirring, which can improve the flow mark defects in the glass opening part, in order to address the above-mentioned shortcomings.

[0005] A method for polishing a porous glass liquid based on swing stirring comprises the following steps:

[0006] S1. A preset concentration of acidic liquid blasting agent is configured in the pickling tank;

[0007] S2. Use a fixture to load the perforated glass and immerse the glass in the acidic liquid polishing agent in the pickling tank;

[0008] S3. Drive the fixture to move so that the perforated glass follows the fixture and moves horizontally at a uniform speed along a circular path in a vertical plane.

[0009] In one embodiment, step S3 comprises:

[0010] S31, calculating the speed b required for acid polishing of porous glass;

[0011] S32, driving the fixture to move, so that the perforated glass follows the fixture and moves in a vertical plane along a circular path at a speed b.

[0012] In one embodiment, step S31 includes:

[0013] S311. When the glass is immersed in the acidic liquid blasting agent and is stationary, measure the fluid velocity a around the hole on the glass, with the vertical upward direction being the positive direction;

[0014] S312, draw a graph according to formula (1) between 0<θ<2π:

[0015]

[0016] Where θ is the angle of movement of the glass relative to the center of the circular path when it moves along the circular path, and x and y are the x-coordinate and y-coordinate when drawing the graph, respectively;

[0017] S313, iterating the speed b to obtain a b value that makes the drawing origin inside the drawn figure and close to the center of the drawn figure, wherein the b value is the speed b required for acid polishing of porous glass.

[0018] In one embodiment, in step S313, the required speed b for acid polishing of the porous glass obtained must satisfy the following requirement: the ratio of the distance from the drawing origin to the center of the drawn figure to the minimum distance from the center of the drawn figure on the drawn figure is less than 1:50.

[0019] In one embodiment, in step S313, iterating the speed b includes: substituting b from 0 into equation (1) for plotting.

[0020] In one embodiment, the units of the fluid velocity a and the required velocity b for polishing the porous glass are distance / time, or the depth of the depression around the hole / time.

[0021] In one embodiment, the acidic liquid blasting agent is hydrofluoric acid, and the concentration of the acidic liquid blasting agent is between 0.1% and 8%.

[0022] In one embodiment, step S1 further includes: bubbling the acidic liquid blasting agent in the pickling tank through a bubbling tube.

[0023] In one embodiment, in step S311, when the glass is immersed in the acidic liquid blasting agent and is stationary, measuring the fluid velocity a around the hole on the glass includes:

[0024] S3111. Measure the bubble rising speed c in the bubbling tube when the glass is not immersed in the acidic liquid blasting agent. The unit of c is cm / s.

[0025] S3112. Calculate the fluid velocity a around the hole on the glass when the glass is immersed in the acidic liquid blasting agent and is stationary according to formula (2):

[0026] a=c-5 (2).

[0027] In one embodiment, step S32 includes:

[0028] S321, soak and clean the fixture and the perforated glass as soon as possible;

[0029] S322, moving the fixture and the perforated glass in the acidic liquid polishing agent in a vertical plane at a speed b along a circular path, and continuing to immerse for a second time;

[0030] S323, taking out the fixture and the perforated glass from the acid liquid polishing agent and soaking and cleaning them for a third time.

[0031] The method for polishing porous glass liquid based on swing stirring of the present invention improves the flow state of the acid liquid polishing agent around the hole on the glass by making the porous glass move at a uniform speed along a circular path in a vertical plane, so that the flow direction of the acid liquid polishing agent around the hole changes evenly, thereby making the corrosion conditions around the hole similar everywhere, thereby improving the flow mark problem around the hole caused by acid polishing, ensuring the appearance of the product, and improving the yield of the acid polishing operation of the porous glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of a method for polishing a glass liquid with a hole in one embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of a glass liquid polishing system with a hole in one embodiment of the present invention;

[0034] Figure 3 It is a schematic structural diagram of a swing device in one embodiment of the present invention;

[0035] Figure 4 The figure drawn in Embodiment 1 of the present invention;

[0036] Figure 5 This is the interference effect at the glass hole in Example 1 of the present invention;

[0037] Figure 6 The figure drawn in Embodiment 2 of the present invention;

[0038] Figure 7 This is the interference effect at the glass hole in Example 2 of the present invention;

[0039] Figure 8 The figure drawn in Embodiment 3 of the present invention;

[0040] Fig. 9 This is the interference effect at the glass hole in Example 3 of the present invention. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0042] See also Figure 1 The present invention discloses a method for polishing a porous glass liquid based on swing stirring, which can improve the flow mark defects at the glass opening part. The method for polishing a porous glass liquid comprises the following steps:

[0043] S1. Prepare an acidic liquid blasting agent of preset concentration in the pickling tank.

[0044] Specifically, in this embodiment, the acidic liquid polishing agent is hydrofluoric acid, and the concentration of the acidic liquid polishing agent is between 0.1% and 8%. By using hydrofluoric acid as a polishing agent for glass, uniform corrosion of the glass can be achieved, and at the same time, dust attached to the glass surface due to hole opening or glass exposure to the environment can be removed. In this way, by acid polishing the glass with hydrofluoric acid, dust that has not been completely cleaned on the glass surface can be removed, thereby improving the cleanliness of the glass surface.

[0045] In addition, step S1 also includes: bubbling the acid liquid polishing agent in the pickling tank through a bubbling tube. By bubbling the acid liquid polishing agent in the pickling tank, the contact area between the glass and the acid liquid polishing agent during the acid polishing process can be increased, so that the glass is corroded more evenly.

[0046] S2. Use a fixture to load the perforated glass and immerse the glass in the acidic liquid polishing agent in the pickling tank.

[0047] In this embodiment, the perforated glass is clamped and liquid-polished by the perforated glass liquid-polishing system. Figure 2 and Figure 3The perforated glass liquid polishing system includes a pickling tank 100, a mounting bracket 200 arranged beside the pickling tank 100, a mechanical arm 300 slidably arranged on the mounting bracket 200 and capable of being raised and lowered on the mounting bracket 200, a lifting mechanism (not shown) for driving the mechanical arm 300 to rise and fall, and a swing device arranged at the end of the mechanical arm 300, the swing device includes a swing arm 400 rotatably mounted at the end of the mechanical arm 300, a motor shaft 500 for driving the swing arm 400 to rotate relative to the mechanical arm 300 in a vertical plane, and a liquid polishing basket 600, the motor shaft 500 is driven by a servo motor, the free end of the swing arm 400 is rotatably connected to the liquid polishing basket 600 through a coupling 700, a fixture 800 is movably mounted in the liquid polishing basket 600, and the perforated glass to be liquid polished is clamped on the fixture 800.

[0048] Furthermore, a plurality of installation positions are provided in the liquid throwing basket 600, and a clamp 800 for clamping glass can be provided in each installation position. One or more pieces of glass can be clamped in the clamp 800. The glass can be placed vertically or horizontally in the liquid throwing basket 600. Adjacent glasses are spaced at a preset distance. For example, the distance between adjacent glasses is greater than or equal to the thickness of the glass to ensure that the acidic liquid throwing agent can pass through the gap between adjacent glasses to ensure that the glass surface is fully polished.

[0049] In addition, in this embodiment, the volume of the acid liquid blasting agent in the pickling tank 100 must be sufficient. When the liquid blasting basket 600 is filled with glass and the liquid blasting basket 600 is placed in the pickling tank 100, the glass can be completely immersed in the acid liquid blasting agent, and the acid liquid blasting agent will not overflow from the pickling tank 100. In addition, the pickling tank 100, the liquid blasting basket 600 and the fixture 800 must be made of materials resistant to hydrofluoric acid corrosion, such as engineering plastics, butyl rubber or copper-nickel alloy.

[0050] S3. Drive the fixture to move so that the perforated glass follows the fixture and moves horizontally at a uniform speed along a circular path in a vertical plane.

[0051] It should be noted that in this embodiment, the perforated glass is limited to move at a uniform speed in a vertical plane, which can avoid the problem that when the glass is rotated, the glass generates a speed that increases along the rotation radius due to the rotation, and the speed of each point on the glass remains unchanged. In this way, when the hole on the glass is not at the center of the glass rotation, a long strip of flow marks will appear at the hole of the glass. In this solution, by making the glass move horizontally along a circular path in a vertical plane, the movement direction of each part of the glass can be changed evenly, so that the corrosion amount around the hole is similar everywhere. In addition, the glass piece is made to move horizontally in a vertical plane because the reaction flow and the bubble movement are both carried out in the vertical plane. Accordingly, the plane of the horizontal movement can affect the speed of the bubble and the liquid projectile only on the vertical plane.

[0052] In one embodiment, step S3 includes:

[0053] S31. Calculate the speed b required for acid polishing of porous glass.

[0054] Step S31 includes:

[0055] S311. When the glass is immersed in the acidic liquid blasting agent and is stationary, measure the fluid velocity a around the hole on the glass, with the vertical upward direction being the positive direction.

[0056] In step S311, when the glass is immersed in the acidic liquid blasting agent and is stationary, measuring the fluid velocity a around the hole on the glass includes:

[0057] S3111. Measure the bubble rising speed c in the bubbling tube when the glass is not immersed in the acidic liquid blasting agent. The unit of c is cm / s.

[0058] S3112. Calculate the fluid velocity a around the hole on the glass when the glass is immersed in the acidic liquid blasting agent and is stationary according to formula (2):

[0059] a=c-5 (2).

[0060] S312, draw a graph according to formula (1) between 0<θ<2π:

[0061]

[0062] Wherein, θ is the angle of movement of the glass relative to the center of the circular path when it moves along the circular path, and x and y are the x-coordinate and y-coordinate when drawing. In this embodiment, θ is obtained by calculating the angle between the line connecting the initial position of the glass to the center of the circular path and the line connecting the current position of the glass to the center of the circular path.

[0063] S313, iterate the speed b to obtain the b value that makes the drawing origin inside the drawn figure and close to the center of the drawn figure, and the b value is the speed b required for the porous glass acid polishing. In step S313, the speed b required for the porous glass acid polishing obtained must satisfy: the ratio of the distance from the drawing origin to the center of the drawn figure to the minimum distance from the center of the drawn figure on the drawn figure is less than 1:50. It can be understood that the drawing result is approximately circular, and the b value that makes the drawing origin inside the circle and close to the center of the circle obtained by iterating b is the speed b required for the porous glass acid polishing of this scheme. Furthermore, the units of the fluid speed a and the speed b required for the porous glass acid polishing are distance / time, or the depth of the depression around the hole / time. Preferably, in this embodiment, the units of the fluid speed a and the speed b required for the porous glass acid polishing are cm / s.

[0064] It should be noted that in step S313, iterating the speed b includes: substituting b from 0 into formula (1) for drawing. In this way, as the substituted b value increases, it can be seen that the radius of the approximate circular figure drawn gradually increases, gradually including the origin, and the origin gradually approaches the center of the drawn approximate circle until the positional relationship between the origin and the center meets the above requirements.

[0065] S32, driving the fixture to move, so that the perforated glass follows the fixture and moves horizontally along a circular path at a speed b in a vertical plane.

[0066] Step S32 includes:

[0067] S321, soak and clean the fixture and the perforated glass as soon as possible.

[0068] S322, the fixture and the perforated glass are moved in a vertical plane at a speed b along a circular path in the acid liquid polishing agent (moving liquid polishing), and the glass is immersed for a second time. When the glass is moved in the acid liquid polishing agent, it can be moved in a clockwise direction along a circular path, or it can be moved in a counterclockwise direction along a circular path.

[0069] S323, taking out the fixture and the perforated glass from the acid liquid polishing agent and soaking and cleaning them for a third time.

[0070] The liquid polishing process of the porous glass of the present scheme is described below with reference to specific examples.

[0071] First, prepare hydrofluoric acid with a concentration of 8% in the pickling tank, and turn on the bubbler so that the bubbler tube blows air into the hydrofluoric acid solution in the pickling tank to form bubbles. Before the operation, a large number of tests were conducted on the bubble rising speed and the hole flow mark conditions. It was found that when the bubble rising speed was 5 cm / s, the sample hole flow mark was relatively slight. In this embodiment, the bubbler tube was controlled to bubble at a bubble rising speed of 10 cm / s, and the flow speed without bubbling reaction was -5 cm / s, and the surrounding fluid speed a was obtained to be 5 cm / s. According to formula (1), b was iterated, and the speeds b = 10 rad / min (Example 1), b = 50 rad / min (Example 2), and b = 100 rad / min (Example 3) were taken to draw graphs (such as Figure 4 , Figure 6 as well as Figure 8 When b=50 rad / min, the origin is close to the center of the circle and does not change significantly with increasing speed.

[0072] Example 1

[0073] Clamp the glass on the fixture in an upright manner, and put the fixture into the liquid throwing basket. The liquid throwing basket is placed next to the cleaning tank filled with clean water for standby use. Place the liquid throwing basket in the lifting area of ​​the robot arm, control the robot arm to descend through the lifting mechanism, and connect the coupling and the liquid throwing basket, and then control the robot arm to rise through the lifting mechanism. Move the mounting bracket or rotate the robot arm, so that the robot arm drives the liquid throwing tank to move above the cleaning tank, and then the lifting mechanism controls the robot arm to descend, so that the liquid throwing basket drives the glass to immerse in the cleaning tank, and continue to immerse and clean for 1 minute. Then, through the action of the lifting mechanism, the liquid throwing basket and the glass are taken out of the cleaning tank, and the liquid throwing basket and the glass are placed in the pickling tank, so that the liquid throwing basket drives the glass to immerse in the acidic liquid throwing agent, and the servo motor controls the motor shaft to rotate, so that the motor shaft drives the liquid throwing basket and the glass to rotate along the circular path (the radius of the circular path is determined by the length of the swing arm) at a speed of 10rad / min in the vertical plane. During this process, the glass is continuously immersed in the acidic liquid throwing agent and continues to move and immerse for 10 minutes. After moving and soaking, take the liquid throwing basket and glass out of the pickling tank and put them into another cleaning tank for continuous soaking and cleaning for 1 minute to remove the residual acid on the glass surface. Then, take the liquid throwing basket and glass out of the cleaning tank through the lifting mechanism and ship them out. Check the appearance of the glass. The interference condition of the hole position on the glass is as follows: Figure 5 shown.

[0074] Example 2

[0075] The difference between this embodiment and embodiment 1 is that the glass rotates along a circular path at a speed of 50 rad / min in the pickling tank, and the interference condition at the hole position on the glass is as follows: Figure 7 shown.

[0076] Example 3

[0077] The difference between this embodiment and embodiment 1 is that the glass is rotated along a circular path at a speed of 100 rad / min in the pickling tank, and the interference condition at the hole position on the glass is as follows: Fig. 9 shown.

[0078] Combination Figure 4-9 It can be seen that when b = 10 rad / min, the center of the drawing pattern deviates far from the origin, and the flow mark at the hole of the product is serious; when b = 50 rad / min, the center of the drawing pattern is close to the origin, and the flow mark at the hole of the product is slight; when b = 100 rad / min, the center of the drawing pattern is close to the origin, and the flow mark at the hole of the product is slight. Therefore, considering the polishing cost, when b = 50 rad / min, the flow mark at the hole on the glass can be significantly improved.

[0079] The method for polishing porous glass liquid based on swing stirring of the present invention improves the flow state of the acid liquid polishing agent around the hole on the glass by making the porous glass move at a uniform speed along a circular path in a vertical plane, so that the flow direction of the acid liquid polishing agent around the hole changes evenly, thereby making the corrosion conditions around the hole similar everywhere, thereby improving the flow mark problem around the hole caused by acid polishing, ensuring the appearance of the product, and improving the yield of the acid polishing operation of the porous glass.

[0080] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for polishing porous glass liquid based on swing stirring, characterized in that: The following steps are involved: S1. A preset concentration of acidic liquid blasting agent is configured in the pickling tank; S2. Use a fixture to load the perforated glass and immerse the glass in the acidic liquid polishing agent in the pickling tank; S3. Drive the fixture to move so that the perforated glass follows the fixture and moves horizontally at a uniform speed along a circular path in a vertical plane.

2. The method for polishing molten glass with a hole according to claim 1, characterized in that: Step S3 includes: S31, calculating the speed b required for acid polishing of porous glass; S32, driving the fixture to move, so that the perforated glass follows the fixture and moves in a vertical plane along a circular path at a speed b.

3. The method for polishing molten glass with a hole according to claim 2, characterized in that: Step S31 includes: S311. When the glass is immersed in the acidic liquid blasting agent and is stationary, measure the fluid velocity a around the hole on the glass, with the vertical upward direction being the positive direction; S312, draw a graph according to formula (1) between 0<θ<2π: Where θ is the angle of movement of the glass relative to the center of the circular path when it moves along the circular path, and x and y are the x-coordinate and y-coordinate when drawing the graph, respectively; S313, iterating the speed b to obtain a b value that makes the drawing origin inside the drawn figure and close to the center of the drawn figure, wherein the b value is the speed b required for acid polishing of porous glass.

4. The method for polishing molten glass with a hole according to claim 3, characterized in that: In step S313, the required speed b for acid polishing of the porous glass obtained must satisfy the following requirement: the ratio of the distance from the drawing origin to the center of the drawn figure to the minimum distance from the center of the drawn figure on the drawn figure is less than 1:

50.

5. The method for polishing molten glass with a hole according to claim 3, characterized in that: In step S313, the iterating of the speed b includes: substituting b from 0 into equation (1) for plotting.

6. The method for polishing molten glass with a hole according to claim 3, characterized in that: The units of fluid velocity a and the velocity b required for polishing the porous glass acid are distance / time, or depth of depression around the hole / time.

7. The method for polishing molten glass with a hole according to claim 1, characterized in that: The acidic liquid blasting agent is hydrofluoric acid, and the concentration of the acidic liquid blasting agent is between 0.1% and 8%.

8. The method for polishing molten glass with a hole according to claim 3, characterized in that: Step S1 also includes: bubbling the acidic liquid blasting agent in the pickling tank through a bubbling tube.

9. The method for polishing molten glass with a hole according to claim 8, characterized in that: In step S311, when the glass is immersed in the acidic liquid blasting agent and is stationary, measuring the fluid velocity a around the hole on the glass includes: S3111. Measure the bubble rising speed c in the bubbling tube when the glass is not immersed in the acidic liquid blasting agent. The unit of c is cm / s. S3112. Calculate the fluid velocity a around the hole on the glass when the glass is immersed in the acidic liquid blasting agent and is stationary according to formula (2): a=c-5 (2).

10. The method for polishing molten glass with a hole according to claim 2, characterized in that: Step S32 includes: S321, soak and clean the fixture and the perforated glass as soon as possible; S322, moving the fixture and the perforated glass in the acidic liquid polishing agent in a vertical plane at a speed b along a circular path, and continuing to immerse for a second time; S323, taking out the fixture and the perforated glass from the acid liquid polishing agent and soaking and cleaning them for a third time.

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