CN109231800B - Method for adjusting flatness of product, hot-bent product processing technology and hot-bent product - Google Patents

Method for adjusting flatness of product, hot-bent product processing technology and hot-bent product Download PDF

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CN109231800B
CN109231800B CN201710558748.7A CN201710558748A CN109231800B CN 109231800 B CN109231800 B CN 109231800B CN 201710558748 A CN201710558748 A CN 201710558748A CN 109231800 B CN109231800 B CN 109231800B
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temperature
product
flatness
hot
workpiece
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CN109231800A (en
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饶桥兵
欧阳庚平
刘鑫平
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Lens Technology Changsha Co Ltd
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Lens Technology Changsha Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/84—Heating or cooling
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products

Abstract

The invention relates to the field of hot-bent product processing, and particularly provides a method for adjusting the flatness of a product, a hot-bent product processing technology and a hot-bent product. According to the method for adjusting the flatness of the product, the temperature of the upper die and the temperature of the lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die in the hot bending process of the workpiece, so that the flatness of the workpiece is a non-standard value to make up for the bending of the product after the chemical strengthening process. The temperature of the upper die and the temperature of the lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die, so that the workpiece is bent (namely, pre-adjustment), and the bending direction of the workpiece is opposite to the bending direction of the workpiece in the subsequent chemical strengthening process, so that the bending of the product after the chemical strengthening process is compensated, and the flatness of the product meets the specified requirement. The method has the advantages of simple and mature process and low cost.

Description

Method for adjusting flatness of product, hot-bent product processing technology and hot-bent product
Technical Field
The invention relates to the field of hot-bent product processing, in particular to a method for adjusting the flatness of a product, a hot-bent product processing technology and a hot-bent product.
Background
The hot bending is a process of heating a workpiece to a prescribed bending temperature of the workpiece and then bending the workpiece, and organic glass, plastic sheets (plates), and the like are used as materials for the hot bending.
The hot bending glass is curved glass formed by heating and softening flat glass in a mold and annealing. The traditional 3D hot-bent product with four bent sides can generate excessive bending of a plane part in a chemical strengthening procedure in a processing process, and the flatness of the product can not meet the requirement; alternatively, in order to achieve the required flatness of the product, a method of adding a subsequent treatment process after chemical strengthening to adjust the flatness is generally adopted, and the method complicates the whole processing process of the hot-bent product and increases the equipment cost and the labor cost.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a method for adjusting the flatness of a product, which has the advantages of simple and mature process, low cost and no increase of equipment cost and labor cost, and can effectively adjust the flatness of the product to meet the specified requirements.
The second purpose of the invention is to provide a hot-bent product processing technology, which can enable the flatness of a product to meet the specified requirements, has simple and mature process, does not increase other equipment and manpower, and has lower cost.
The third purpose of the invention is to provide a hot-bent product, which is processed by adopting the hot-bent product processing technology and has the advantages of high product surface flatness level and low cost.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
in a first aspect, the invention provides a method for adjusting the flatness of a product, wherein the temperature of an upper die and the temperature of a lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die in the hot bending process of a workpiece, so that the flatness of the workpiece is a non-standard value to compensate for the bending of the product after a chemical strengthening process.
As a further preferred solution, the method comprises the steps of:
(a) determining flatness R of chemically strengthened workpiece2；
(b) Determining a standard value R of the flatness of the product;
(c) obtaining the flatness R of the hot-bent workpiece1，R1＝R-R2；
(d) Adjusting the temperature of an upper die and/or a lower die in the workpiece hot bending process to obtain the flatness R of the hot bent workpiece1Time upper die temperature T1And the temperature T of the lower die2；
Or recording the upper die with different temperatures and the lower die with different temperatures to the workpieceFlatness of the hot-bent workpiece, and then R1Corresponding upper die temperature T1And the temperature T of the lower die2；
(e) And (3) product processing: carrying out hot bending on the workpiece, wherein the temperature of an upper die in the hot bending is T1The temperature of the lower die is T2And then chemically strengthening the hot-bent workpiece to obtain a product with the flatness R.
As a further preferred embodiment, R2Is the average value of the flatness obtained after carrying out chemical strengthening tests with the same parameters on at least two identical workpieces.
As a further preferred technical scheme, the flatness standard value R is a numerical value set [ R [ ]min,Rmax]Any numerical value of (1).
As a further preferred solution, the hot bending process comprises preheating, forming and annealing, T1And T2The upper die temperature and the lower die temperature during annealing are respectively set.
As a further preferable technical solution, the preheating is sectional preheating, the molding is sectional molding, and the annealing is sectional annealing.
As a further preferred solution, T1And T2Respectively the temperature of the upper die and the temperature of the lower die during the first section annealing.
In a second aspect, the invention provides a hot-bent product processing technology, which comprises the following steps: and (3) carrying out hot bending on the clean workpiece, wherein the temperature of the upper die and/or the temperature of the lower die during hot bending are respectively adjusted by the temperature of the upper die and/or the temperature of the lower die obtained by the method for adjusting the flatness of the product, and then carrying out chemical strengthening to obtain a hot-bent product.
As a further preferable technical solution, the method comprises the following steps: firstly, cutting; then grinding and cleaning; then hot bending is carried out, the hot bending comprises sectional preheating, sectional forming and sectional annealing, wherein the temperature of the upper die is T during the first section annealing1The lower die temperature is T2(ii) a Then carrying out special-shaped processing on the workpiece subjected to hot bending; and finally, carrying out chemical strengthening to obtain a hot-bending product.
In a third aspect, the invention provides a hot-bent product processed by the hot-bent product processing technology.
Compared with the prior art, the invention has the beneficial effects that:
the method for adjusting the flatness of the product provided by the invention ensures that the temperatures of the upper die and the lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die in the hot bending process of the workpiece, so that the flatness of the workpiece is a non-standard value, and the bending of the product after the chemical strengthening process is compensated, namely the temperature of the upper die and the temperature of the lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die, so that the workpiece is bent (namely pre-adjustment), and the bending direction of the workpiece is opposite to the bending direction of the workpiece in the subsequent chemical strengthening process, so that the bending of the product after the chemical strengthening process is compensated (namely the workpiece can be corrected smoothly in the subsequent chemical strengthening process), and the flatness of the product reaches the specified requirement. Compared with the prior method of adding subsequent treatment process after chemical strengthening, the method adopts the preposed adjustment method, can ensure that the flatness of the product can reach the specified requirement only by adjusting the temperature of the upper die and/or the lower die in the necessary hot bending procedure for processing the hot bent product, has simple and mature process, does not increase other equipment and manpower, and has lower cost. Meanwhile, the method comprehensively considers the relationship between the hot bending process and the chemical strengthening process and the influence on the flatness of the product, is used for guiding the production of the product and leads the processing technology of the product to be more advanced.
The processing technology of the hot-bent product comprises hot bending and chemical strengthening, wherein the temperature of an upper die and/or the temperature of a lower die during hot bending respectively adopt the adjusted upper die temperature and/or lower die temperature obtained in the method, the processing technology adopts a method of prepositive flatness adjustment, and the temperature of the upper die and/or the lower die in the hot bending process necessary for processing the hot-bent product is set to be the specific temperature after adjustment, so that the workpiece is bent in the direction opposite to the direction generated in the chemical strengthening process in the hot bending process, and then is corrected in the chemical strengthening process, the flatness of the product can meet the specified requirement, the technology is simple and mature, other equipment and manpower cannot be increased, and the cost is lower. Meanwhile, the relation between the hot bending process and the chemical strengthening process and the influence on the flatness of the product are comprehensively considered in the processing technology, and the technology is more advanced.
The hot-bent product provided by the invention is processed by adopting the hot-bent product processing technology, and has the advantages of high product surface flatness level and low cost.
Drawings
FIG. 1 is a schematic diagram showing the comparison of the shape of a workpiece with the standard shape of a product in the case where the upper mold temperature is higher than the lower mold temperature in the method for adjusting the flatness of the product according to example 1;
FIG. 2 is a schematic diagram showing the comparison between the shape of a work piece and the standard shape of a product in the case where the temperature of a lower die is higher than that of an upper die in the method for adjusting the flatness of the product according to example 1;
FIG. 3 is a schematic diagram showing the comparison between the shape of the workpiece chemically strengthened in the method for adjusting the flatness of the product according to example 1 and the standard shape of the product.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer.
In a first aspect, an embodiment of the present invention provides a method for adjusting flatness of a product, in which the upper die temperature and the lower die temperature are adjusted to be different in a hot bending process of a workpiece, so that the flatness of the workpiece is an off-standard value to compensate for a bend of the product after a chemical strengthening process.
The upper die and the lower die are components having a heating function, the workpiece reaches a bending temperature and is bent to finally form a desired shape when the upper die and the lower die are heated, different hot bending devices may be named differently, such as an upper heating plate, a lower heating plate, and the like, as long as the function of heating up and heating can be achieved, and a person skilled in the art should not limit the scope of the present invention accordingly.
Typical but non-limiting products in the present invention are glass products or plastic products, etc.
In the method for adjusting the flatness of the product provided by the embodiment, the temperatures of the upper die and the lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die in the hot bending process of the workpiece, so that the flatness of the workpiece is a non-standard value, so as to compensate the bending of the product after the chemical strengthening process, that is, the temperatures of the upper die and the lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die, so that the workpiece is bent (namely, pre-adjustment), and at the moment, the bending direction of the workpiece is opposite to the bending direction of the workpiece in the subsequent chemical strengthening process, so that the bending of the product after the chemical strengthening process is compensated (namely, the workpiece can be corrected in the subsequent chemical strengthening process), and the flatness of the product reaches the specified requirement. Compared with the prior method of adding subsequent treatment process after chemical strengthening, the method adopts the preposed adjustment method, can ensure that the flatness of the product can reach the specified requirement only by adjusting the temperature of the upper die and/or the lower die in the necessary hot bending procedure for processing the hot bent product, has simple and mature process, does not increase other equipment and manpower, and has lower cost.
Specifically, when the lower die temperature is higher than the lower die temperature, the workpiece is bent in the opposite direction to the lower die (i.e., bent in the direction of the upper die); when the upper die temperature is higher than the lower die temperature, the workpiece is bent in the opposite direction of the upper die (i.e., in the direction toward the lower die). And the workpiece is bent in the direction of applying the chemical strengthening force after the chemical strengthening process. Therefore, the temperature of the upper die and the temperature of the lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die, so that the workpiece is bent in the opposite direction to that of the workpiece during chemical strengthening during hot bending, the bending of the product generated in the subsequent chemical strengthening process is compensated, and the flatness of the product meets the specified requirement. Meanwhile, the method comprehensively considers the relationship between the hot bending process and the chemical strengthening process and the influence on the flatness of the product, is used for guiding the production of the product and leads the processing technology of the product to be more advanced.
In the invention, the main purposes of chemical strengthening of the workpiece after hot bending are to release the internal stress of the product, enhance the strength of the product and reduce the occurrence of cracking and the like.
Preferably, when the workpiece is made of glass, the chemical strengthening can be performed by using a potassium nitrate solution and/or a sodium nitrate solution during the chemical strengthening, so as to further improve the impact resistance and the like of the glass product.
It should be understood that the term "workpiece" in the present invention refers specifically to an intermediate product (which may include raw materials) during the processing of a product, such as an intermediate product before and after hot bending or an intermediate product after only chemical strengthening; the product refers to a final product with the flatness meeting the requirement after hot bending and chemical strengthening.
In a preferred embodiment, the method comprises the steps of:
(a) determining flatness R of chemically strengthened workpiece2；
(b) Determining a standard value R of the flatness of the product;
(c) obtaining the flatness R of the hot-bent workpiece1，R1＝R-R2；
(d) Adjusting the temperature of an upper die and/or a lower die in the workpiece hot bending process to obtain the flatness R of the hot bent workpiece1Time upper die temperature T1And the temperature T of the lower die2；
(e) And (3) product processing: carrying out hot bending on the workpiece, wherein the temperature of an upper die in the hot bending is T1The temperature of the lower die is T2And then chemically strengthening the hot-bent workpiece to obtain a product with the flatness R.
The preferred embodiment provides a first specific method of adjusting the flatness of a product by first determining the flatness R of a chemically strengthened workpiece2Obtaining the flatness R required to be achieved after the workpiece is subjected to hot bending by using the flatness standard value R of the product1，R1＝R-R2(ii) a Then adjusting the temperature of the upper die and/or the temperature of the lower die in the hot bending test, and measuring the flatness R of the workpiece at the first set of upper die temperature and lower die temperature11By comparison of R11And R1Difference R ofx(Rx＝R11-R1) Further, it is judged whether or not the temperature of the upper mold needs to be increased (the temperature of the lower mold is decreased) or the temperature of the lower mold needs to be increased (the temperature of the upper mold is decreased), and then adjustment is made so that R is madexPerforming a cycle test by analogy until the flatness is R1(i.e., R)xZero), the temperature of the upper die and the temperature of the lower die at the time are the required T1And T2(ii) a Finally, using T1And T2The product processing is carried out, namely, the workpiece is subjected to hot bending, and the temperature of an upper die during the hot bending is T1The temperature of the lower die is T2And then chemically strengthening the hot-bent workpiece to obtain a product with the flatness R.
The first specific method is highly targeted, depending on the desired R1Performing purposeful reasonable hot bending test, namely determining a group of upper die temperature, lower die temperature and flatness value, determining the upper die temperature and/or lower die temperature of the second test by referring to the value and the flatness standard value R, and testing to obtain the flatness value at the temperature, so as to obtain the required R through the cycle test1And T corresponding thereto1And T2. The method is particularly suitable for targeting specific R2And R to adjust the flatness of the product.
In a preferred embodiment, the method comprises the steps of:
(a) recording the flatness of the workpiece after the workpiece is subjected to hot bending by the upper die and the lower die at different temperatures;
(b) determining flatness R of chemically strengthened workpiece2；
(c) Determining a standard value R of the flatness of the product;
(d) obtaining the flatness R of the hot-bent workpiece1，R1＝R-R2；
(e) Finding R in the data recorded in step (a)1Corresponding upper die temperature T1And the temperature T of the lower die2；
(f) And (3) product processing: hot bending and heating the workpieceThe temperature of the upper die during bending is T1The temperature of the lower die is T2And then chemically strengthening the hot-bent workpiece to obtain a product with the flatness R.
The preferred embodiment provides a second specific method for adjusting flatness of a product, which first records flatness of a workpiece after hot bending the workpiece by an upper die with different temperatures and a lower die with different temperatures, and the above data preferably uses a table or a number set { T } T1x，T2x，R1x}(R1xThe temperature of the mold on the finger is T1xThe temperature of the lower die is T2xFlatness of the workpiece after hot bending) for preservation; then determining the flatness R of the chemically strengthened workpiece2Obtaining the flatness R required to be achieved after the workpiece is subjected to hot bending by using the flatness standard value R of the product1，R1＝R-R2(ii) a Then find R in the above table or number set1Corresponding upper die temperature T1And the temperature T of the lower die2(ii) a Finally, using T1And T2The product processing is carried out, namely, the workpiece is subjected to hot bending, and the temperature of an upper die during the hot bending is T1The temperature of the lower die is T2And then chemically strengthening the hot-bent workpiece to obtain a product with the flatness R.
The second specific method differs from the first specific method mainly in that: the second specific method records the flatness of the workpiece at a plurality of sets of upper and lower die temperatures, since the required flatness R is not taken into account only1Thus, the flatness value range in the above table or set of numbers is broad, may be positive, may be negative, and is half-scaled relative to the flatness standard value R. The advantage of the second embodiment is that if different chemical strengthening methods are used or different flatness standards are established, etc., only the flatness R of the workpiece after the chemical strengthening needs to be determined2Or the changed flatness standard value R, and further calculating the R required after the change1Then, the modified R is found in the table or the number set1Corresponding upper die temperature T1And the temperature T of the lower die2The hot bending test is not required to be carried out again, so that the adjusting time is greatly saved, and the application range is wider.
In a preferred embodiment, R2Is the average value of the flatness obtained after carrying out chemical strengthening tests with the same parameters on at least two identical workpieces. In order to increase the accuracy of the chemical strengthening test and thus the flatness adjustment, R2The average value of the flatness after multiple chemical strengthening tests is taken.
Preferably, during the hot bending test, the flatness at the same upper die temperature and the same lower die temperature is an average value of at least two tests, so as to improve the accuracy of the hot bending test and further improve the accuracy of flatness adjustment.
In a preferred embodiment, the flatness criterion R is a set of values [ R [ ]min,Rmax]Any numerical value of (1). In actual production, the flatness standard value R is set as a value set [ R ] due to certain tolerance of flatness of the product caused by raw material difference, instability possibly existing in equipment operation and the likemin,Rmax]Any value in (1), i.e. the flatness of the adjusted product, can be regarded as meeting the standard as long as the value is in the value set.
In a preferred embodiment, the hot bending process comprises preheating, shaping and annealing, T1And T2The upper die temperature and the lower die temperature during annealing are respectively set. The workpiece is heated in the preheating stage until the bending temperature is reached, then the bending forming (such as the bending of four edges and the like) of the required part of the workpiece is realized at the bending temperature, and annealing is carried out after the forming. Adjusting the temperature of the upper die and/or the temperature of the lower die during annealing to a desired T1And T2Not only can the stability of the forming structure required by the workpiece in hot bending be ensured; meanwhile, because the temperature is higher during forming, the cooling speed of the upper die and/or the cooling speed of the lower die are adjusted during annealing to reach T1And T2The temperature does not need to be raised, energy is saved, and the temperature selection range is wide; and can selectively realize the bending opposite to the bending direction of the chemical strengthening process at higher temperature and high temperatureThe lower workpiece is easier to bend, and the adjusting time is saved.
In a preferred embodiment, the preheating is a step preheating, the forming is a step forming, and the annealing is a step annealing. The step of sectional preheating is that each time period is preheated at different temperature, the step of sectional forming is that each time period is heated at different temperature and at least one section is pressurized by gradually changing pressure from low to high, the step of sectional annealing is that each time period is annealed by different temperature, and the time periods of the step of sectional preheating, the step of sectional forming and the step of sectional annealing are two or more than two. By adopting the sectional preheating, the sectional forming and the sectional annealing, the size precision of the product is higher, the flatness of the formed product is better, the forming yield is high, the appearance defects are few, and most importantly, the product consistency is high, so the accuracy in the flatness adjustment of the product is relatively higher, and the difference of the flatness of the product processed each time under the same condition is reduced. In addition, the more the number of the sections of the section annealing (namely, the more the annealing stations), the more uniform the internal stress of the product is, the more stable the internal structure is, and the mechanical strength of the product is further improved.
In a preferred embodiment, T1And T2Respectively the temperature of the upper die and the temperature of the lower die during the first section annealing. The temperatures of the upper die and the lower die are still in a high-temperature state during the first-stage annealing, so that the workpiece is easy to bend, and the adjustable spaces of the temperatures of the upper die and the lower die are large; in addition, after the temperature of the upper die and the temperature of the lower die are adjusted during the first-stage annealing, the temperature of the upper die and the temperature of the lower die can be kept consistent in the second-stage annealing and the subsequent annealing after the workpiece is bent, so that the stress in the workpiece is uniformly released, and the stress state of each part in the workpiece is consistent as much as possible.
In a second aspect, an embodiment of the present invention provides a hot-bent product processing process, including the steps of: and (3) carrying out hot bending on the clean workpiece, wherein the temperature of the upper die and/or the temperature of the lower die during hot bending are respectively adjusted by the temperature of the upper die and/or the temperature of the lower die obtained by the method for adjusting the flatness of the product, and then carrying out chemical strengthening to obtain a hot-bent product.
The processing technology of the hot-bent product provided by the embodiment comprises hot bending and chemical strengthening, wherein the temperature of the upper die and/or the temperature of the lower die during hot bending respectively adopt the adjusted upper die temperature and/or lower die temperature obtained in the method, the processing technology adopts a method for adjusting the flatness in a preposed mode, and the temperature of the upper die and/or the lower die in the hot bending process necessary for processing the hot-bent product is set to be the specific temperature after adjustment, so that the workpiece is bent in the direction opposite to the direction generated in the chemical strengthening process in the hot bending process, and then is corrected in the chemical strengthening process, the flatness of the product can meet the specified requirement, the technology is simple and mature, other equipment and manpower cannot be increased, and the cost is low. Meanwhile, the relation between the hot bending process and the chemical strengthening process and the influence on the flatness of the product are comprehensively considered in the processing technology, and the technology is more advanced.
In a preferred embodiment, the method comprises the following steps: firstly, cutting; then grinding and cleaning; then hot bending is carried out, the hot bending comprises sectional preheating, sectional forming and sectional annealing, wherein the temperature of the upper die is T during the first section annealing1The lower die temperature is T2(ii) a Then carrying out special-shaped processing on the workpiece subjected to hot bending; and finally, carrying out chemical strengthening to obtain a hot-bending product. The process is complete, the steps from cutting, grinding and cleaning to hot bending, special shape and chemical strengthening are mutually matched and integrated, the relation between the hot bending process and the chemical strengthening process and the influence on the flatness of a product are comprehensively considered, and the temperature of an upper die is set to be T during the first section annealing of the hot bending process1The lower die temperature is T2The flatness of the product can meet the requirement, the time cost and the energy cost can be saved, and the mechanical strength of the product is improved.
It should be noted that a cleaning step is also included between profile and chemical strengthening.
Preferably, the cutting is performed by a milling machine, the grinding is flat grinding, the cleaning is ultrasonic cleaning, and the chemical strengthening is performed in a chemical strengthening furnace.
In a third aspect, the invention provides a hot-bent product processed by the hot-bent product processing technology. The hot-bent product has the advantages of high surface flatness level and low cost.
The following examples are provided to further illustrate the flatness adjustment and hot-bending process of the product according to the present invention.
Example 1
The supplied material is glass, the annealing point of the glass is about 603 ℃, the strain point is about 550 ℃, the softening point is about 684 ℃, and the glass is processed into a rectangular flat glass product with four bent sides.
The method for adjusting the flatness of the glass comprises the following steps:
(a) recording the flatness of the workpiece after the workpiece is subjected to hot bending by the upper die and the lower die at different temperatures, which are detailed in tables 1 and 2;
(b) determining flatness R of chemically strengthened workpiece2(average of multiple measurements) 0.12 mm;
(c) determining a standard value R of the flatness of the product, and setting the R to be zero for convenient recording and calculation;
(d) obtaining the flatness R of the hot-bent workpiece1，R1＝R-R2＝-0.12mm；
(e) Finding R in the data recorded in step (a)1Corresponding upper die temperature T1Is 632 ℃ and the lower die temperature T2Is 613 ℃;
(f) and (3) product processing: and (3) carrying out hot bending on the workpiece, wherein the temperature of an upper die is 632 ℃ and the temperature of a lower die is 613 ℃ during hot bending, and then carrying out chemical strengthening on the hot-bent workpiece to obtain a product with the flatness R.
TABLE 1
Figure BDA0001346184960000121
Figure BDA0001346184960000131
TABLE 2
Figure BDA0001346184960000132
Note: for recording and calculation convenience, the flatness standard value R of the product is set to zero, and therefore, the flatness superstandards recorded in tables 1 and 2 are actual flatness values, and the values are average values of 10 tests.
In addition, fig. 1-3 illustrate the effect of mold temperature and chemical strengthening on workpiece shape in a method of adjusting the flatness of a product.
In addition, the length and width of the workpiece are changed during the chemical strengthening test, the length direction is lengthened by 0.16mm, the width direction is lengthened by 0.06mm, and the length and the width of the workpiece in the hot bending stage can be simultaneously determined again according to the length and width changes and the standard requirements of the product on the length and the width; or, the length and the width of the workpiece during cutting are simultaneously determined so as to be corrected in a subsequent chemical strengthening process.
The following is a complete processing technique of the glass product, comprising the following steps:
1. cutting, namely cutting by adopting a vertical high-speed milling machine, wherein the feeding rate is 360mm/min, and the rotating speed of a main shaft is 2400 r/min;
2. flat grinding, namely flat grinding is carried out by adopting a flat grinding machine, the sweeping speed is 30r/min, the speed of a lower disc is 25r/min, the pressing pressure is 260KG, and the time is 500 s;
3. cleaning, namely heating a cleaning tank to 260 ℃ by using a Jiulong tank cleaning machine, and cleaning for 30min by using ultrasonic positive and negative ions;
4. hot bending-a hot bending machine is adopted, and hot bending parameters are shown in table 3;
TABLE 3
Figure BDA0001346184960000141
As can be seen from Table 3, the above flatness adjustment method can be used to obtainTo the adjusted upper die temperature T1And the temperature T of the lower die2Respectively setting the temperature of an upper die and the temperature of a lower die during the first-stage annealing (annealing 1);
5. the special-shaped equipment is a special-shaped machine, the rotating speed of a left wheel is 20r/min, the rotating speed of a right wheel is 20r/min, the rotating speed of a central shaft is 40r/min, and the time is 18 min;
6. chemical strengthening-the equipment used was a jiwei pressure furnace, and the processing technique and parameters are shown in table 4;
TABLE 4
Figure BDA0001346184960000151
Note: the normal temperature described in Table 4 means 25. + -. 5 ℃.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims (6)

1. A method for adjusting the flatness of a product is characterized in that the temperature of an upper die and the temperature of a lower die are different by adjusting the temperature of the upper die and/or the temperature of the lower die in the hot bending process of the workpiece, so that the flatness of the workpiece is a non-standard value to compensate the bending of the product after a chemical strengthening process;
the method for adjusting the flatness of the product comprises the following steps:
(a) determining flatness R of chemically strengthened workpiece2；
(b) Determining a standard value R of the flatness of the product;
(c) obtaining the flatness R of the hot-bent workpiece1，R1＝R-R2；
(d) Adjusting the temperature of an upper die and/or a lower die in the workpiece hot bending process to obtain the flatness R of the hot bent workpiece1Time upper die temperature T1And the temperature T of the lower die2；
Or recording the flatness of the workpiece after the workpiece is subjected to hot bending by the upper die and the lower die at different temperatures, and then obtaining the flatness R1Corresponding upper die temperature T1And the temperature T of the lower die2；
(e) And (3) product processing: carrying out hot bending on the workpiece, wherein the temperature of an upper die in the hot bending is T1The temperature of the lower die is T2Then, chemically strengthening the hot-bent workpiece to obtain a product with the flatness R;
the hot bending process comprises preheating, forming and annealing, wherein the preheating is sectional preheating, the forming is sectional forming, the annealing is sectional annealing, and T is1And T2The temperature of the upper die and the temperature of the lower die during the first section annealing are respectively, and the temperature consistency of the upper die and the lower die is ensured in the second section annealing and the subsequent annealing.
2. The method of adjusting flatness of a product according to claim 1, wherein R is2Is the average value of the flatness obtained after carrying out chemical strengthening tests with the same parameters on at least two identical workpieces.
3. Method for adjusting the flatness of a product according to claim 1, wherein the flatness criterion value R is a set of values [ Rmin,Rmax]Any numerical value of (1).
4. A hot-bent product processing technology is characterized by comprising the following steps: and (3) carrying out hot bending on the clean workpiece, wherein the temperature of the upper die and/or the temperature of the lower die during hot bending are respectively adjusted according to the adjusted temperature of the upper die and/or the adjusted temperature of the lower die obtained by the method for adjusting the flatness of the product according to any one of claims 1 to 3, and then carrying out chemical strengthening to obtain the hot-bent product.
5. Process for the manufacture of hot-bent products according to claim 4, comprising the following steps: firstly, cutting; then grinding and cleaning; then hot bending and heatingThe bending comprises sectional preheating, sectional forming and sectional annealing, wherein the temperature of an upper die in the first section annealing is T1The lower die temperature is T2(ii) a Then carrying out special-shaped processing on the workpiece subjected to hot bending; and finally, carrying out chemical strengthening to obtain a hot-bending product.
6. A hot-bent product produced by the hot-bent product processing method according to claim 4 or 5.
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TW201708133A (en) * 2015-06-16 2017-03-01 康寧公司 Systems and methods for thermally controlling warp

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* Cited by examiner, † Cited by third party
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CN102663964A (en) * 2010-11-10 2012-09-12 旭硝子株式会社 Cover glass for flat panel displays and method for producing the same
CN103732548A (en) * 2011-05-27 2014-04-16 康宁股份有限公司 Glass molding system and related apparatus and method
CN105358500A (en) * 2013-05-07 2016-02-24 康宁股份有限公司 Compensated molds for manufacturing ion exchange strengthened, 3D glass covers
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