CN111906630B - Preparation method of 3D glass protective shell - Google Patents
Preparation method of 3D glass protective shell Download PDFInfo
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- CN111906630B CN111906630B CN201910384788.3A CN201910384788A CN111906630B CN 111906630 B CN111906630 B CN 111906630B CN 201910384788 A CN201910384788 A CN 201910384788A CN 111906630 B CN111906630 B CN 111906630B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
- B24B17/02—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving mechanical transmission means only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
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Abstract
The embodiment of the invention provides a preparation method of a 3D glass protective shell, which comprises the following steps: controlling a profiling cutter to rotate, moving along the grinding track direction, and grinding the glass material placed on a horizontal-roller CNC machine into a 3D glass blank, wherein the grinding track is a curve obtained by cutting pattern information on a Y-Z surface, and the profile of the profiling cutter on any long-axis section is matched with the curve obtained by cutting the pattern information on an X-Z surface; and carrying out surface treatment on the 3D glass blank to obtain the 3D glass protective shell. According to the method, in the polishing process, the profiling cutter is in contact with the glass material in real time to form a polishing arc line, the polishing arc line extends along the direction of a polishing track in the moving process of the profiling cutter, the inside of the glass material is finally polished into a 3D cavity shape with arc-shaped ends, the whole polishing process is completed at one time, the polishing track is obviously shortened, and the production efficiency of a CNC cutting process in the preparation process of the 3D glass protective shell is further improved.
Description
Technical Field
The invention relates to the technical field of accessories of glass products of electronic products, in particular to a preparation method of a 3D glass protective shell.
Background
To avoid signal shielding effect and make the electronic product have better holding feeling and aesthetic feeling. More and more electronic products are beginning to adopt 3D glass protective cases.
In order to ensure the grinding precision of the 3D glass protective shell, the 3D glass protective shell may be prepared by using a Numerical Control (CNC) cutting process. When a CNC cutting process is adopted to prepare the 3D glass protective shell, firstly, pattern information of the 3D glass protective shell needs to be designed, the pattern information is converted into cutting track information of a cutter, and the cutting track information is sent to a controller of the CNC engraving and milling machine; the controller converts the cutting track information into a pulse signal so as to control the motor to drive the cutter to move along the cutting track. And in the process that the cutter moves along the cutting track, the glass material contacted with the cutter is cut off, and finally, the 2D glass material is cut into the 3D glass protective shell corresponding to the pattern information.
However, since the two ends of the 3D glass protective shell are generally arc-shaped, a ball point cutter is required to be used for cutting in the cutting process. In the cutting process, the X direction is divided into a plurality of sections, each section is called as a cutting line space, the ball head cutter is used for cutting along the curves cut by the Y and Z surfaces, after each section is polished, the cutting line space delta X is fed, another adjacent curve is polished, and the cutting is sequentially carried out until the cutting of the 3D glass protective shell is completed. Because the end cutting speed of the ball head cutter is zero, in order to guarantee the grinding precision, the cutting line distance is generally short in the cutting process of the ball head cutter. And the process grinding time is longer when the line spacing is cut.
Disclosure of Invention
Based on the technical problems, the invention aims to provide a preparation method of a 3D glass protective shell.
In a first aspect, an embodiment of the present invention provides a method for manufacturing a 3D glass protective shell, including: controlling a horizontal roll CNC profiling cutter to rotate and move along a polishing track direction, and polishing a glass material placed on a horizontal roll CNC machine table into a 3D glass blank, wherein the profiling cutter is in contact with the glass material to form a polishing arc line, the polishing arc line extends along the polishing track direction in the moving process of the profiling cutter, the polishing track is a curve cut by the pattern information on a Y-Z surface, and the profile cut by the profiling cutter on any long axis section is matched with the curve cut by the pattern information on an X-Z surface; and carrying out surface treatment on the 3D glass blank to prepare the 3D glass protective shell. According to the method, in the grinding process, the side face and part of the end face of the profiling cutter are in contact with the glass material to form a grinding arc line in the rotating process of the profiling cutter, the grinding arc line extends along the direction of a grinding track in the moving process of the profiling cutter, and the profiling cutter can grind and remove the glass material in contact with the profiling cutter in the rotating process due to the fact that the surface of the profiling cutter is provided with the fine cutter teeth, so that the glass material placed on a horizontal roller CNC machine table is ground into a 3D glass blank. Whole process profiling cutter of polishing need not reciprocating motion, the shortening track of polishing that can show, and then promotes CNC cutting process production efficiency in 3D glass protective housing preparation process.
With reference to the first aspect, in a first possible implementation manner of the first aspect, if the lumen depth of the pattern information is greater than the single sanding depth threshold, the pattern information includes: the single-polishing bottom surface pattern information is determined by a single-polishing depth threshold; the lumen depth of the pattern information is less than the single sanding depth threshold, the pattern information comprising: lumen pattern information. Therefore, the inner cavity depth of the pattern information in the embodiment of the invention determines the grinding track, and the profiling cutter grinds the glass materials in layers along the grinding track under the condition that the inner cavity depth of the pattern information is greater than the single grinding depth threshold value, so that the height of the 3D glass protective shell prepared in the embodiment of the invention can reach 2mm-7mm, and the inner cavity depth can reach 1mm-6mm.
With reference to the first aspect, in a second possible implementation manner of the first aspect, a distance from any point of the inner cavity of the pattern information to the side wall is smaller than a distance from any point of the inner cavity of the 3D glass protective shell to the side wall by 0.02mm to 0.5mm; the surface treatment comprises the following steps: CNC finishing engraving is carried out on the 3D glass blank, mechanical light scanning processing is carried out on the 3D glass blank, the 3D glass blank after light scanning is obtained, and the distance from any point of the inner cavity of the 3D glass blank after light scanning to the side wall is 0.001mm-0.02mm smaller than the distance from any point of the inner cavity of the 3D glass protective shell to the side wall; and chemically etching the scanned 3D glass blank by using a glass etching agent. In the embodiment, a machining allowance of 0.02mm-0.5mm is reserved in an inner cavity of the 3D glass blank, and the machining allowance of 0.02mm-0.5mm is removed in a mechanical light scanning and chemical etching mode in the subsequent surface treatment process, so that the effect of removing microcracks on the surface of the 3D glass blank is achieved, and the surface strength of the 3D glass protective shell prepared in the embodiment of the application is improved.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the step of chemically etching the scanned 3D glass blank by using a glass etchant includes: placing the 3D glass blank after light sweeping in a material frame, placing the material frame in an etching groove, and placing a glass etching agent in the etching groove; and stirring the glass etching agent, and chemically etching the scanned 3D glass blank. In the embodiment, the concentration of the glass etching agent in each part of the etching groove is ensured to be uniform in a stirring mode, so that the uniform etching of the surface of the 3D glass blank is ensured, and the strength of the 3D glass blank is improved.
With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the step of chemically etching the scanned 3D glass blank by using a glass etchant includes: and spraying a glass etching agent to the 3D glass blank by using a spray head, and chemically etching the polished 3D glass blank. In the embodiment of the invention, the glass etching agent is sprayed on the surface of the 3D glass blank in a spraying mode, so that the glass etching agent is ensured to uniformly reach the surface of the 3D glass blank, and the effect of uniformly removing the micro cracks on the surface of the 3D glass blank is achieved.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the step of spraying the glass etchant to the 3D glass blank by using a spray head includes: placing the 3D glass blank after the light scanning in a material frame, placing the material frame in a spraying tunnel, wherein a conveying belt is arranged at the bottom of the spraying tunnel; the uniformity of chemical etching is adjusted by controlling the pressure intensity and the rotation angle of the spray head and the transmission speed of the conveyor belt, so that the surface of the 3D glass blank is uniformly etched, and the effect of uniformly removing microcracks on the surface of the 3D glass blank is achieved.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, a distance between any point of the inner cavity of the pattern information and the side wall is smaller than a distance between any point of the inner cavity of the 3D glass protective shell and the side wall by 0.02mm to 0.5mm; the surface treatment comprises the following steps: CNC fine engraving is carried out on the 3D glass blank to obtain a fine engraved 3D glass blank, and the distance from any point of an inner cavity of the fine engraved 3D glass blank to the side wall is 0.002mm-0.04mm smaller than the distance from any point of the inner cavity of the 3D glass protective shell to the side wall; chemically etching the surface of the 3D glass blank after the fine engraving by using a glass etching agent to obtain a chemically etched 3D glass blank; and mechanically scanning the 3D glass blank subjected to the photochemical etching. In this embodiment, the mechanical light scanning can also remove impurities such as glass material powder attached to the surface of the 3D glass blank during the chemical etching process, or impurities such as a product after etching, thereby ensuring that the surface of the prepared 3D glass protective shell is clean.
In combination with the first aspectIn a seventh possible implementation manner of the first aspect, the glass etchant includes: hydrofluoric acid with the volume ratio of 2-15%, hydrochloric acid with the volume ratio of 1-5%, nitric acid with the volume ratio of 1-10% and sulfuric acid with the volume ratio of 5-15%. In the embodiment of the invention, the glass etchant provided by the embodiment of the invention is added with three strong acids based on hydrofluoric acid. The action of the strong acid is, on the one hand, to provide H + ，H + Inhibiting Na 2 SiO 3 By hydrolysis of (2) to limit H 2 SiO 3 Thereby ensuring that the glass etching agent can be uniformly contacted with the surface of the 3D glass blank. On the other hand, the strong acid can react CaSiO 3 、Na 2 And substances such as O, caO, 6SiO and the like are dissolved, so that the uniform contact of the surface of the 3D glass blank with the glass etching agent is ensured.
With reference to the first aspect, in an eighth possible implementation manner of the first aspect, the temperature of the chemical etching is controlled to be 30-40 ℃.
With reference to the first aspect, in a ninth possible implementation manner of the first aspect, a distance from any point of the inner cavity of the pattern information to the side wall is smaller than a distance from any point of the inner cavity of the 3D glass protective shell to the side wall by 0.02mm to 0.5mm; the surface treatment comprises the following steps: CNC finishing, and, mechanical polishing process. According to the embodiment of the invention, CNC (computerized numerical control) engraving is carried out on the surface of the glass blank, and mechanical light scanning treatment can remove microcracks generated on the surface of the glass, so that the strength of the 3D glass shell is enhanced.
Drawings
FIG. 1 is a flow diagram of a method for making a 3D glass protective shell according to a preferred embodiment;
FIG. 2 is a flow chart of a method of making a 3D glass protective shell according to a preferred embodiment;
FIG. 3 is a plot of pattern information provided in accordance with a preferred embodiment sectioned at the Y-Z plane;
FIG. 4 is a flow chart of a method of making a 3D glass protective shell according to a preferred embodiment;
fig. 5 is a flow chart of a method for making a 3D glass protective shell according to a preferred embodiment.
Detailed Description
The grinding process described in the embodiment of the present invention may be implemented by CNC, which may be horizontal roll CNC. The horizontal roller CNC is more easy to remove chips during machining of workpieces, and is more beneficial to machining of complex recesses and inner cavities of dies. The processing method of the 3D glass protection shell is mainly described by taking horizontal-roller CNC as an example, and in specific implementation, other types of CNC or other general or special processing equipment may also be used, which is not limited in this application.
Example 1:
the following description will explain the preparation method shown in the examples of the present application with reference to the drawings. Please refer to fig. 1, which is a schematic flow chart of an embodiment of a method for manufacturing a 3D glass protective shell, wherein the embodiment shown in fig. 1 includes the following steps:
s101: and controlling the profiling cutter to rotate and move along the polishing track direction.
After the glass material is fixed on a horizontal roller CNC machine table, the horizontal roller CNC drives a profiling cutter to rotate and moves along the polishing track direction. In the polishing process, the polishing arc line formed by the contact of the profiling cutter and the glass material is longer than the polishing arc line formed by the contact of the ball-point cutter and the glass material.
Wherein, the shape and the grinding track of the profiling cutter can be determined according to the shape of the 3D glass shell. In practical application, the pattern information of the 3D glass protective shell to be prepared can be drawn firstly, and then the shape and the grinding track of the profiling cutter can be determined according to the pattern information.
Taking the preparation of the 3D glass shell with two arc-shaped ends as an example, the whole profiling cutter can be in a capsule shape, two ends of the long axis of the profiling cutter are called cutter end faces, and the side face of the short axis of the profiling cutter is called cutter side face. The profiling cutter is characterized in that the profiling cutter is in a rotating process, the side face of the cutter and part of the end face of the cutter are in contact with glass materials to form a polishing arc line, the polishing arc line extends along the direction of a polishing track in the moving process of the profiling cutter, fine cutter teeth are arranged on the surface of the profiling cutter, the glass materials in contact with the profiling cutter can be polished and removed by the profiling cutter in the rotating process, and therefore the glass materials placed on a horizontal-roller CNC machine table are polished into 3D glass blanks. Whole process profiling cutter of polishing need not reciprocating motion, the shortening track of polishing that can show, and then promotes CNC cutting process production efficiency in 3D glass protective housing preparation process.
S102: and carrying out surface treatment on the 3D glass blank to prepare a 3D glass protective shell.
The surface treatment in the embodiment of the present application may include a chemical surface treatment and/or a physical surface treatment. Wherein, the chemical surface treatment refers to chemically etching the surface of the 3D glass blank by using a glass etching agent; the physical surface treatment refers to the treatment of the surface of the 3D glass blank by using a CNC engraving and milling machine or the mechanical scanning of the surface of the 3D glass blank.
After the 3D glass blank is generated, only the physical surface treatment can be carried out on the 3D glass blank, only the chemical surface treatment can be carried out on the 3D glass blank, and both the physical surface treatment and the chemical surface treatment can be carried out on the 3D glass blank. In specific implementation, specific implementation manners and processing sequences of the chemical surface treatment and the physical surface treatment can be determined according to actual needs.
The physical surface treatment of the 3D glass blank may be performed in various ways, for example, CNC engraving or mechanical polishing may be performed on the 3D glass blank. The 3D glass blank can be subjected to chemical surface treatment in various ways, for example, the 3D glass blank can be soaked in an etching agent to realize the chemical surface treatment of the 3D glass blank; and the chemical surface treatment of the 3D glass blank can be realized by spraying the etching agent in sequence.
According to the method, the side face and part of the end face of the profiling cutter are in contact with the glass material to form a polishing arc line in the rotating process of the profiling cutter, the polishing arc line extends along the direction of a polishing track in the moving process of the profiling cutter, and the profiling cutter can polish and remove the glass material in contact with the profiling cutter in the rotating process due to the fact that the surface of the profiling cutter is provided with the fine cutter teeth, so that the glass material placed on a horizontal-roller CNC machine table is polished into a 3D glass blank. Whole process profiling cutter that polishes need not reciprocating motion, the shortening track of polishing that can show, and then promotes CNC cutting process production efficiency in 3D glass protective housing preparation process.
Example 2:
the method for manufacturing the 3D glass protective shell according to this embodiment is further described with reference to fig. 2. Referring to fig. 2, a schematic flow chart of an embodiment of a method for manufacturing a 3D glass protective shell is shown, where the embodiment shown in fig. 2 includes the following steps:
s201: and designing a profiling cutter according to the pattern information of the 3D glass protective shell, and generating a grinding track of the profiling cutter in the horizontal roller CNC according to the pattern information of the 3D glass protective shell.
In one implementation, the profiling tool profile may be determined by the following process: firstly, drawing pattern information according to a 3D glass protective shell to be prepared, and constructing a right-handed Cartesian rectangular coordinate system based on the pattern information. For convenience of explanation, in the embodiment of the present invention, a direction perpendicular to the bottom surface of the pattern information is taken as a Z-axis, and two side directions perpendicular to each other on the bottom surface are taken as an X-axis direction and a Y-axis direction. Then, in the coordinate system, the curve of the pattern information in the X-Z plane determines the contour of the profiling tool. Because four side walls of the 3D glass protective shell prepared by the embodiment of the invention are arc-shaped, or two opposite side walls are arc-shaped, two ends of a curve cut by the pattern information on an X-Z plane are arc lines. Therefore, the end face of the cutter is an arc surface, the radian of the arc surface is the same as the radian of the arc line at the two ends of the curve of the X-Z surface cut by the pattern information, and the side face of the cutter is cylindrical.
In the embodiment of the invention, the surface of the profiling cutter can be provided with a plurality of fine cutter teeth, and the profiling cutter with the fine cutter teeth on the surface can be prepared in an electroplating or sintering way in the production process.
It should be noted that the profiling cutter may also be designed and prepared in advance before the 3D glass protection shell is prepared, and the application is not limited thereto.
S202: and controlling the horizontal roll CNC profiling cutter to rotate, moving along the polishing track direction, and polishing the glass material placed on the horizontal roll CNC machine table into a 3D glass blank.
In the embodiment of the invention, part of the end face of the cutter is contacted with the glass material, and the specific contact area is determined by the depth of single grinding. The glass material is at the in-process of polishing, and the stress value of glass material, the specification of cutter, the dynamics of polishing, the speed of polishing to and, the degree of depth of polishing all has certain influence to the quality of polishing. Taking the polishing depth as an example, under the condition that the stress value of the glass material, the specification of the cutter, the polishing force and the polishing speed are fixed, if the polishing depth is too large, the glass material can be broken.
Typically, the 3D glass protective shell has a height of 1mm to 3mm and an inner cavity depth of 0.3mm to 2mm. Under special conditions, the height of the 3D glass protective shell can reach 2mm-7mm, and the depth of the inner cavity can reach 1mm-6mm. For avoiding leading to the glass material fracture because of the depth of polish is too deep, can confirm the single depth of polish threshold value earlier in concrete application, the single depth of polish threshold value is when stress value, the specification of cutter, the dynamics of polishing, the speed of polishing at the glass material are fixed, the biggest depth of polish under the prerequisite of guaranteeing to polish in-process glass material fracture problem not appear. And then, comparing the single polishing depth threshold with the inner cavity depth of the pattern information, and finishing the polishing process of the glass material cavity at one time if the inner cavity depth of the pattern information is smaller than the single polishing depth threshold. And if the depth of the inner cavity of the pattern information is larger than the single polishing depth threshold value, polishing the glass materials in a layering mode.
In one implementation, the layered sanding may be achieved by: first, the lumen pattern information of the 3D glass protective shell is designed. And then, adding a single polishing bottom surface pattern at preset intervals in the vertical direction of the inner cavity pattern information to generate pattern information, wherein the preset distance is smaller than or equal to a single polishing depth threshold value. And finally, controlling the horizontal roll CNC profiling cutter to rotate, moving along the polishing track direction, and polishing the glass material placed on the horizontal roll CNC machine table into a 3D glass blank. Fig. 3 is a graph of the cross-section of the pattern information in the Y-Z plane under the condition that the cavity depth of the pattern information is greater than the single sanding depth threshold in one embodiment.
According to the preparation method provided by the embodiment of the invention, the 3D glass protective shell is prepared in a layered grinding mode, the height of the prepared 3D glass protective shell can reach 2-7 mm, and the depth of an inner cavity can reach 1-6 mm.
In the polishing process, the fine cutter teeth on the surface of the profiling cutter polish the contacted glass materials, and the contacted glass materials are polished and removed. However, the fine teeth on the profiling tool surface leave micro-cracks on the 3D glass blank surface due to the grinding process. Therefore, the micro cracks on the surface of the 3D glass blank need to be subjected to surface treatment subsequently. The surface treatment process can further remove glass materials on the surface of the 3D glass blank. Therefore, in the design process of the pattern information, the distance from any point of the inner cavity of the pattern information to the side wall is 0.02mm-0.5mm smaller than the distance from any point of the inner cavity of the 3D glass protective shell to the side wall, and machining allowance is reserved for the subsequent surface treatment process.
S203: and carrying out CNC (computer numerical control) fine engraving on the 3D glass blank to obtain the 3D glass blank after the fine engraving.
The CNC engraving and milling glass is to adopt an engraving and milling machine grinding wheel groove to grind the blank glass and remove the allowance; and chamfering and drilling the glass raw material by a drill, and performing finish machining on the appearance of the 3D glass blank and the camera hole by using a fine grinding wheel to meet the requirements of a final finished product.
S204: and mechanically scanning the 3D glass blank after the finish carving to prepare a 3D glass protective shell.
In one embodiment, the micro-cracks left on the surface of the 3D glass blank can be removed by means of a complex relative motion between the grinding tool and the surface of the 3D glass blank under a certain pressure, and meanwhile, the 3D glass blank is ground to a specified thickness and polished to have a surface mirror effect.
In the embodiment, the horizontal roller CNC is applied to polishing of the 3D glass protective shell, and the 3D glass protective shell can be rapidly molded through the profiling cutter; micro cracks on the surface of the 3D glass blank can be removed through a CNC engraving process; the mechanical polishing process can further remove microcracks on the surface of the 3D glass blank and knife lines caused in the CNC engraving and machining process, and the surface strength of the prepared 3D glass protective shell is guaranteed to be improved.
Example 3:
on the basis of the technical scheme shown in embodiment 2, the microcracks on the surface of the 3D glass blank can be further removed by adopting a chemical surface treatment mode, and the knife lines left in the CNC engraving process can be ensured to improve the surface strength of the 3D glass protective shell prepared by the embodiment. This is further illustrated below with reference to examples.
Fig. 4 is a schematic flow chart of a manufacturing method of the 3D glass protective shell provided in this embodiment, and the embodiment includes the following steps:
s301: designing a profiling cutter according to the pattern information of the 3D glass protective shell, and generating a grinding track of the profiling cutter in the CNC (computerized numerical control) horizontal roller according to the pattern information of the 3D glass protective shell.
For a specific implementation, reference may be made to the foregoing embodiments, which are not described herein again.
S302: and controlling the horizontal roll CNC profiling cutter to rotate, moving along the polishing track direction, and polishing the glass material placed on the horizontal roll CNC machine table into a 3D glass blank.
For a specific implementation, reference may be made to the foregoing embodiments, which are not described herein again.
And (3) performing CNC finishing and polishing treatment on the 3D glass blank subjected to the horizontal roller CNC forming in the step (302) to obtain the 3D glass blank with the size reserving the machining allowance of 0.001-0.02 mm for the chemical etching.
S303: CNC finishing impression and sweep light 3D glass blank, obtain the 3D glass blank after sweeping the light.
The specific implementation of CNC engraving and scanning is not described herein.
S304: and chemically etching the scanned 3D glass blank by using a glass etching agent to prepare the 3D glass protective shell.
In one implementation, the method may: firstly, the 3D glass blank after the light scanning is placed in a material frame. Then, the material frame is placed in an etching groove, and a glass etching agent is placed in the etching groove. And finally, stirring the glass etching agent, and chemically etching the scanned 3D glass blank. Wherein the agitating comprises: bubbling the glass etching agent, stirring the glass etching agent and swinging and rotating the material frame. The chemical surface treatment mode that provides through this embodiment can guarantee that the concentration of each part glass etchant is even in the etching groove, and then guarantees that 3D glass blank surface etching is even, and the 3D glass protection shell surface strength who this embodiment prepared promotes.
In another implementation, the method may: and placing the 3D glass blank in a material frame, placing the material frame in a spray tunnel, and adjusting the amount of the glass etchant sprayed out of the spray header and the spray angle of the glass etchant by controlling the pressure and the rotation angle of the spray header. Can, through the conveying speed of adjustment conveyer belt, adjust the time of 3D glass blank and glass etchant contact, guarantee the homogeneity of chemical etching through foretell adjustment, and then guarantee that the 3D glass protective case surface strength who prepares out of this embodiment promotes.
Because the main component of the glass material is SiO 2 Therefore, the 3D glass blank can be chemically etched by using hydrofluoric acid. But in practical use, because of SiO removal 2 In addition, glass materials may also be present such as: na (Na) 2 SiO 3 、CaSiO 3 、SiO 2 Or Na 2 And a mixture of O, caO and 6 SiO. In the chemical etching process using hydrofluoric acid, na 2 SiO 3 Hydrolysis will lead to H 2 SiO 3 (precipitation) and is attached to the surface of the 3D glass blank, so that the contact of the surface of the 3D glass blank and hydrofluoric acid is hindered, and the prepared 3D glass protective shell has a rough surface and low strength.
In order to avoid the rough surface of the 3D glass protective shell, three strong acids can be added on the basis of hydrofluoric acid to obtain a glass etching agent, and the glass etching agent can comprise: 2 to 15 percent of hydrofluoric acid, 1 to 5 percent of hydrochloric acid, 1 to 10 percent of nitric acid and 5 to 15 percent of sulfuric acid. The chemical etching temperature can be controlled between 30 ℃ and 40 ℃, and the chemical etching speed is 2 mu m/s to 5 mu m/s. And after chemical etching, the removal amount of the 3D glass blank surface is 0.001mm-0.02mm.
The glass etching agent provided by the embodiment of the invention is added with three strong acids on the basis of hydrofluoric acid. The strong acid can provide H + on the one hand, thereby inhibiting Na 2 SiO 3 Hydrolysis of (2), limiting H 2 SiO 3 Thereby ensuring that the glass etchant can be uniformly mixed with the 3D glassThe surfaces of the glass blanks are contacted. On the other hand, caSiO can be prepared 3 、Na 2 And substances such as O, caO, 6SiO and the like are dissolved, so that the uniform contact of the surface of the 3D glass blank with the glass etching agent is ensured.
The glass etching agent is used for reacting with the surface of the 3D glass blank, so that the removing amount of the 3D glass blank surface is several microns to dozens of microns, microcracks on the surface of the 3D glass blank are removed, knife lines generated in the engraving process are removed, and the effect of enhancing the strength of the glass material is achieved.
In the embodiment, the CNC of the horizontal roller is applied to polishing of the 3D glass protective shell, and the 3D glass protective shell can be rapidly molded through the profiling cutter; and effectively remove the crazing line on 3D glass blank surface through the chemical etching method to and, the knife lines that produce in the finishing impression process, the 3D glass protection shell surface strength who prepares promotes.
Example 4:
in the technical solution shown in embodiment 3, in the specific implementation process, CNC engraving, mechanical polishing, and the specific implementation manner and processing sequence of chemical etching can be determined according to actual needs. For example, the glass material powder attached to the surface of the 3D glass blank during the chemical etching process, or the product after etching, and other impurities. In order to ensure the cleanliness of the surface of the prepared 3D glass protective shell, in one embodiment, chemical etching may be performed first, and then mechanical polishing may be performed.
The following describes the production method shown in the examples of the present application with reference to the drawings. Referring to fig. 5, a schematic flow chart of an embodiment of a method for manufacturing a 3D glass protective shell is shown, where the embodiment shown in fig. 5 includes the following steps:
s401: designing a profiling cutter according to the pattern information of the 3D glass protective shell, and generating a grinding track of the profiling cutter in the CNC (computerized numerical control) horizontal roller according to the pattern information of the 3D glass protective shell.
For a specific implementation, reference may be made to the foregoing embodiments, which are not described herein again.
S402: and controlling the horizontal roller CNC profiling cutter to rotate, moving along the polishing track direction, and polishing the glass material arranged on the horizontal roller CNC machine table into a 3D glass blank.
For a specific implementation, reference may be made to the foregoing embodiments, which are not described herein again.
S403: CNC CNC engraving 3D glass blank obtains the 3D glass blank after the engraving.
And CNC fine engraving is carried out on the 3D glass blank subjected to CNC forming of the horizontal roller in the S402, so that the fine engraved 3D glass blank with the machining allowance of 0.001mm-0.02mm for chemical etching in size is obtained.
S404: and chemically etching the carved 3D glass blank to obtain the chemically etched 3D glass blank.
For a specific implementation, reference may be made to the foregoing embodiments, which are not described herein again.
S405: and mechanically scanning the 3D glass blank subjected to the photochemical etching to prepare the 3D glass protective shell.
And mechanically scanning the shell subjected to the chemical etching in the S404 to obtain the 3D glass protective shell with the size and appearance meeting the requirements.
In the embodiment, the CNC engraving process can remove microcracks on the surface of the 3D glass blank; the chemical etching process can effectively remove the knife lines caused by the surface processing of the 3D glass blank in the CNC engraving process; the mechanical light sweeping process can further remove knife lines caused by engraving, and meanwhile, the mechanical light sweeping process can also remove glass material powder attached to the surface of a 3D glass blank in the chemical etching process or impurities such as an etched product, so that the cleanliness of the surface of the prepared 3D glass protective shell is ensured.
According to the technical scheme, the method for manufacturing the 3D glass protective shell provided by the embodiment of the invention has the advantages that the profiling cutter is designed according to the structural size of the finished product 3D glass protective shell, then, the grinding of glass materials is realized by using the horizontal roller CNC, the profiling cutter does not need to move back and forth in the whole grinding process, the grinding track is obviously shortened, and the technical problem of low production efficiency of the CNC cutting process in the 3D glass protective shell manufacturing process is solved. Meanwhile, according to the preparation method of the 3D glass protective shell provided by the embodiment of the invention, the chemical etching method is used for removing microcracks on the surface of the material of the 3D glass protective shell caused by CNC (computer numerical control) grinding or knife lines on the surface of the material caused by mechanical scanning and polishing, so that the surface strength of the prepared 3D glass protective shell is improved.
Claims (10)
1. A method for preparing a 3D glass protective shell, comprising:
controlling a horizontal roll CNC to drive a profiling cutter to rotate and move along a grinding track direction, grinding a glass material placed on a horizontal roll CNC machine table into a 3D glass blank with an inner cavity, wherein the profiling cutter is in a capsule shape, the profiling cutter and the grinding track are determined according to inner cavity pattern information in pattern information of a 3D glass protection shell, the profiling cutter is in contact with the glass material to form a grinding arc line, the grinding arc line extends along the grinding track direction in the moving process of the profiling cutter, if the direction perpendicular to the bottom surface of the pattern information is taken as a Z axis, two side directions perpendicular to each other on the bottom surface are taken as an X axis direction and a Y axis direction to establish a coordinate system, the grinding track is a curve of the pattern information on a Y-Z surface, and the profile of the profiling cutter on a long axis section is matched with the curve of the pattern information on the X-Z surface;
and carrying out surface treatment on the 3D glass blank to prepare the 3D glass protective shell.
2. The method of claim 1,
if the lumen depth of the pattern information is greater than the single sanding depth threshold, the pattern information further includes: single sanding bottom surface pattern information determined by the single sanding depth threshold.
3. The method according to claim 1, wherein a distance from any point of the lumen of the pattern information to the sidewall is 0.02mm to 0.5mm smaller than a distance from any point of the lumen of the 3D glass protective shell to the sidewall;
the surface treatment comprises:
carrying out CNC (computer numerical control) engraving and mechanical light scanning treatment on the 3D glass blank to obtain a light-scanned 3D glass blank, wherein the distance from any point of an inner cavity of the light-scanned 3D glass blank to the side wall is 0.001-0.02 mm smaller than the distance from any point of the inner cavity of the 3D glass protective shell to the side wall;
and chemically etching the 3D glass blank after the light scanning by using a glass etching agent.
4. The method of claim 3, wherein chemically etching the swept 3D glass blank with a glass etchant comprises:
placing the 3D glass blank after the light scanning in a material frame, and placing the material frame in an etching groove, wherein the glass etching agent is placed in the etching groove;
and stirring the glass etching agent, and chemically etching the 3D glass blank after the light scanning.
5. The method of claim 3, wherein chemically etching the swept 3D glass blank with a glass etchant comprises:
and spraying a glass etching agent to the scanned 3D glass blank by using a spray head.
6. The method of claim 5, wherein the step of spraying a glass etchant onto the 3D glass blank with a showerhead comprises:
placing the 3D glass blank after the light scanning in a material frame, placing the material frame in a spraying tunnel, wherein a conveying belt is arranged at the bottom of the spraying tunnel;
the uniformity of the chemical etching is adjusted by controlling the pressure intensity and the rotation angle of the spray header and the transmission speed of the conveyor belt.
7. The method according to claim 1, wherein a distance between any point of the inner cavity of the pattern information and the side wall is smaller than a distance between any point of the inner cavity of the 3D glass protective shell and the side wall by 0.02mm-0.5mm;
the surface treatment comprises:
CNC fine engraving is carried out on the 3D glass blank to obtain a fine engraved 3D glass blank, and the distance from any point of an inner cavity of the fine engraved 3D glass blank to the side wall is 0.002mm-0.04mm smaller than the distance from any point of the inner cavity of the 3D glass protective shell to the side wall;
chemically etching the surface of the 3D glass blank after the engraving by using a glass etching agent to obtain a chemically etched 3D glass blank;
and mechanically scanning the chemically etched 3D glass blank.
8. The method of any of claims 3 to 7, wherein the glass etchant comprises: hydrofluoric acid with the volume ratio of 2-15%, hydrochloric acid with the volume ratio of 1-5%, nitric acid with the volume ratio of 1-10% and sulfuric acid with the volume ratio of 5-15%.
9. The method according to any one of claims 3 to 7, wherein the temperature of the chemical etching is controlled to be 30 ℃ to 40 ℃.
10. The method according to claim 1, wherein the distance from any point of the lumen of the pattern information to the side wall is 0.02mm to 0.5mm smaller than the distance from any point of the lumen of the 3D glass protective shell to the side wall;
the surface treatment comprises:
carrying out CNC (computer numerical control) fine engraving on the 3D glass blank to obtain a fine engraved 3D glass blank;
and mechanically sweeping the 3D glass blank after the engraving to prepare a 3D glass protective shell.
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