CN107417075B - Curved glass hot bending forming structure, heat conducting part thereof and manufacturing method of curved glass - Google Patents
Curved glass hot bending forming structure, heat conducting part thereof and manufacturing method of curved glass Download PDFInfo
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- CN107417075B CN107417075B CN201710645704.8A CN201710645704A CN107417075B CN 107417075 B CN107417075 B CN 107417075B CN 201710645704 A CN201710645704 A CN 201710645704A CN 107417075 B CN107417075 B CN 107417075B
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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
- C03B23/0302—Re-forming glass sheets by bending by press-bending between shaping moulds between opposing full-face shaping moulds
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides comprising a particular metallic binder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/04—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbonitrides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
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Abstract
The invention discloses a curved glass hot-bending forming structure, a heat conducting part thereof and a curved glass manufacturing method, and aims to solve the problem that in the prior art, the heat conducting part of the curved glass hot-bending forming structure cannot be considered in terms of high-temperature chemical stability and high-temperature mechanical property at the same time. This curved surface glass hot bending forming structure includes: a heating section for generating a high temperature required for softening a glass blank; a molding section for pressing the softened glass blank to mold the glass blank into curved glass; the heat conduction part is arranged between the heating part and the forming part and is used for conducting heat generated by the heating part to the forming part; wherein the heat conductive portion is mainly composed of a Ti (C, N) -based cermet, or has a protective layer mainly composed of a Ti (C, N) -based cermet.
Description
Technical Field
The invention relates to the technical field of curved glass hot bending forming, in particular to a curved glass hot bending forming structure, a heat conducting part thereof and a curved glass manufacturing method.
Background
With the continuous upgrade of electronic products such as mobile phones and tablet computers, curved glass (e.g., 2.5D glass screens and 3D glass screens) has been adopted in large quantities for the screens of such electronic products. Curved glass is typically manufactured by hot bending a curved glass into a structure that is placed on a hot bending machine. At present, the major electronic product glass supply chain enterprises of blues science and technology, berne optics and the like purchase hot bending machines in large quantities, but compared with the annual sales volume of billions of the whole global mobile phones, the yield of curved glass can be called cup water waggon. In view of the fact that only some mobile phones of mobile phone manufacturers such as samsung, millet and huashi use curved glass as the rear cover plate or the front panel and the limited supply amount, the curved glass is expected to be an outbreak period of curved glass requirements in the coming years, and therefore, the curved glass hot bending forming technology is also rapidly developed.
As shown in fig. 1, the present mainstream curved glass hot bending structure is arranged on a hot bending machine, and comprises: a pair of upper heating plate 21 and lower heating plate 22 which can move relatively under the action of distance control mechanism 11, upper forming die 41 which is positioned below upper heating plate 21 and lower forming die 42 which is positioned above lower heating plate 22 and is matched with upper forming die 41, upper heat conducting plate 31 which is positioned between upper heating plate 21 and upper forming die 41 and lower heat conducting plate 32 which is positioned between lower heating plate 22 and lower forming die 42, upper heat conducting plate 31 is installed on the lower surface of upper heating plate 21, lower heat conducting plate 32 is installed on the upper surface of lower heating plate 22, and a cavity which is used for placing glass blank and is needed for press forming softened glass blank is formed between upper forming die 41 and lower forming die 42.
The method for manufacturing the curved glass by using the curved glass hot bending forming structure basically comprises the following steps: firstly, assembling a curved glass hot bending forming structure into a pressing preparation state, wherein a glass blank is arranged between an upper forming die and a lower forming die; then, the upper heating plate and the lower heating plate move oppositely through the distance control mechanism, so that the upper heating plate and the upper heat conduction plate are sequentially attached above the upper forming die from top to bottom, the lower heating plate and the lower heat conduction plate are sequentially attached below the lower forming die from bottom to top, and meanwhile, the upper heating plate and the lower heating plate respectively transfer heat to the upper forming die and the lower forming die through the upper heat conduction plate and the lower heat conduction plate, so that the glass blank contained in the cavity is softened; then, further controlling the distance between the upper heating plate and the lower heating plate through a distance control mechanism to further press the upper forming die and the lower forming die to enable the upper forming die and the lower forming die to move towards the die closing direction, so that the softened glass blank is subjected to compression forming, and the glass blank is formed into curved glass; and finally, cooling the mold, and taking out the curved glass product from the mold after cooling.
In the curved glass hot bending structure, the upper heating plate and the lower heating plate constitute a heating portion for generating a high temperature required for softening the glass blank, the upper forming mold and the lower forming mold constitute a forming portion (i.e., a curved glass hot bending mold) for pressing the softened glass blank to form the curved glass, and the upper heat conducting plate and the lower heat conducting plate constitute a heat conducting portion for conducting heat generated by the heating portion to the forming portion. The heat conducting part is arranged to separate the curved glass hot bending mold from the heating part, greatly reduce the pressure deformation of the heating part and uniformly conduct the heat generated by the heating part to the forming part. The working temperature of the heat conducting part can reach 800-.
Currently, the heat conducting products on the market are mainly classified into cemented carbide, ceramics and high temperature alloys. Most hard alloy products (such as WC-Co hard alloy) have good performances in the aspects of high-temperature strength, hardness, carburization resistance and the like, but the oxidation resistance is insufficient, so that the products are frequently replaced or processed and repaired, and the dimensional precision and the yield of the curved glass are finally influenced. The high-temperature alloy products mainly comprise nickel-based alloys such as 310S stainless steel and the like, generally have good high-temperature corrosion resistance, but have defects in the aspects of high-temperature hardness, high-temperature strength, high-temperature creep resistance, carburization resistance and the like, so that the high-temperature dimensional stability is insufficient, and the working precision is seriously influenced. The ceramic products are mainly represented by silicon carbide ceramics, and although the ceramic products have remarkable advantages in the aspects of dimensional stability, high-temperature corrosion resistance and the like, the defects of high inherent brittleness, insufficient thermal shock resistance, low strength and the like cause great challenges for assembly and reliable application; in addition, the ceramic material is easy to crack in the using process, and the equipment is difficult to continuously operate for a long time.
On the other hand, Ti (C, N) -based cermets are those containing Ti (C, N) as a hard phase and iron group metals such as Co, Ni and Mo as a binder phase, and are often added with WC, TaC, NbC and Mo2C、VC、Cr3C2The carbides of transition metals form a composite material of the strengthening phase. Ti (C, N) -based cermet has excellent high temperature resistance, wear resistance, toughness and strength, and is mainly used as a tool material in the field of machining at present. Furthermore, there are also articles that mention: the Ti (C, N) -based cermet may also serve as: high-temperature components of the engine, such as small bearing bushes, impeller root flanges, valves, valve seats, push rods, rocker arms, eccentric wheel shafts, hot nozzles, piston rings and the like; and sealing machines in the petrochemical industry, such as sealing rings, valves.
However, the application of Ti (C, N) -based cermet to curved glass hot-bending structures, especially to the heat-conducting portions thereof, has not been found, and the possibility of applying Ti (C, N) -based cermet to curved glass hot-bending structures and other products mainly performing uniform stress and heat transfer at high temperatures has not been suggested.
Disclosure of Invention
The invention mainly aims to provide a curved glass hot-bending forming structure, a heat conducting part thereof and a curved glass manufacturing method, so as to solve the problem that the heat conducting part of the curved glass hot-bending forming structure in the prior art cannot be considered at the same time in the aspects of high-temperature chemical stability and high-temperature mechanical property.
To achieve the above object, according to one aspect of the present invention, there is provided a curved glass hot-bending forming structure. This curved surface glass hot bending forming structure includes:
a heating section for generating a high temperature required for softening a glass blank;
a molding section for pressing the softened glass blank to mold the glass blank into curved glass; and
a heat conduction portion provided between the heating portion and the molding portion for conducting heat generated by the heating portion to the molding portion;
wherein the heat-conducting portion is mainly composed of a Ti (C, N) -based cermet, or
The heat conducting portion has a protective layer mainly composed of a Ti (C, N) -based cermet.
Further, the Ti (C, N) -based cermet consists of, in weight percent:
10-90% of Ti (C, N) hard phase,
6-45% of a binder phase of an iron group metal, and
2-45% of a transition metal carbide strengthening phase, wherein
The iron group metal bonding phase comprises one or more of Fe, Co, Ni and Cr,
the transition metal carbide strengthening phase comprises WC and Mo2C. One or more of TaC and NbC.
Further, the Ti (C, N) -based cermet consists of, in weight percent:
50-70% of Ti (C, N) hard phase,
10-25% of a binder phase of an iron group metal, and
the remaining weight percent of a transition metal carbide strengthening phase, wherein
The transition metal carbide phase contains at least WC and Mo2C, a first carbide of a carbon element,
among the first carbides, WC and Mo2The weight ratio of C is 1-3.
Further, the transition metal carbide phase further contains a second carbide composed of at least one of TaC and NbC, and the second carbide accounts for 8 to 25% of the total weight of the transition metal carbide phase.
Further, the heating part comprises a pair of upper heating plate and lower heating plate which can move relatively under the action of the distance control mechanism; the forming part comprises an upper forming die positioned below the upper heating plate and a lower forming die positioned above the lower heating plate and matched with the upper forming die, and a cavity for placing a glass blank and performing compression forming on the softened glass blank is formed between the upper forming die and the lower forming die; the heat conducting part comprises an upper heat conducting plate and a lower heat conducting plate, the upper heat conducting plate is located between the upper heating plate and the upper forming die, the lower heat conducting plate is located between the lower heating plate and the lower forming die, the upper heat conducting plate is installed on the lower surface of the upper heating plate, and the lower heat conducting plate is installed on the upper surface of the lower heating plate.
In order to achieve the above object, according to another aspect of the present invention, there is provided a heat conductive portion of a curved glass hot-bending forming structure. The heat conduction portion is provided between a heating portion for generating a high temperature required for softening a glass blank and a forming portion for pressing the softened glass blank to form curved glass and for conducting heat generated by the heating portion to the forming portion, and is mainly composed of a Ti (C, N) -based cermet or has a protective layer mainly composed of a Ti (C, N) -based cermet.
Further, the Ti (C, N) -based cermet consists of, in weight percent:
10-90% of Ti (C, N) hard phase,
6-45% of a binder phase of an iron group metal, and
2-45% of a transition metal carbide strengthening phase, wherein
The iron group metal bonding phase comprises one or more of Fe, Co, Ni and Cr,
the transition metal carbide strengthening phase comprises WC and Mo2C. One or more of TaC and NbC.
Further, the Ti (C, N) -based cermet consists of, in weight percent:
50-70% of Ti (C, N) hard phase,
10-25% of a binder phase of an iron group metal, and
the remaining weight percent of a transition metal carbide strengthening phase, wherein
The transition metal carbide phase contains at least WC and Mo2C, a first carbide of a carbon element,
among the first carbides, WC and Mo2The weight ratio of C is 1-3.
Further, the transition metal carbide phase further contains a second carbide composed of at least one of TaC and NbC, and the second carbide accounts for 8 to 25% of the total weight of the transition metal carbide phase.
Further, the iron group metal bonding phase is composed of Ni and Co, and the weight ratio of Ni to Co is 0.5-1.5.
Further, the heat conducting part is a heat conducting plate.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a method for manufacturing a curved glass. The method comprises the following steps:
I. setting the curved glass hot bending forming structure to be in a pressing preparation state;
II, heating the forming part by the heating part through the heat conducting part to soften the glass blank contained in the forming part;
and III, pressing the softened glass blank by using a forming part to form the glass blank into the curved glass.
The Ti (C, N) -based metal ceramic as a heat conducting part material of a curved glass hot bending forming structure shows excellent performance in use: firstly, the high-temperature oxidation resistance is very excellent; secondly, the material does not react with other materials of the curved glass hot bending forming structure (the upper heating plate and the lower heating plate which form the heating part usually adopt stainless steel, and the upper forming die and the lower forming die usually adopt graphite) and the curved glass hot bending forming working atmosphere (nitrogen) at high temperature, and the carburizing resistance is excellent; thirdly, the high-temperature mechanical property is excellent, and the dimensional stability is good; fourthly, the wear-resistant and wear-reducing alloy has excellent wear-resistant and wear-reducing characteristics, high hardness and small friction coefficient; fifthly, the heat conductivity is good, and the specific heat capacity is large; sixthly, the linear expansion coefficient of the stainless steel material of the upper heating plate/the lower heating plate is similar to that of the stainless steel material of the upper heating plate/the lower heating plate when the stainless steel material is arranged on the upper heating plate/the lower heating plate; and seventhly, the heat conducting plate can be processed by grinding, electric spark, wire cutting and other modes, and is convenient to manufacture.
In view of the above suitability of Ti (C, N) -based cermet as a material for a heat conductor of a curved glass hot-bending structure, similar technical effects can be achieved when the heat conductor has a protective layer mainly composed of Ti (C, N) -based cermet. The protective layer may be provided on the surface of a material such as cemented carbide, ceramics, or superalloy, which is a conventional heat conducting portion, by a conventional technique such as thermal spraying, PVD, or CVD.
The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:
fig. 1 is a schematic view of a currently mainstream curved glass hot bending structure.
Fig. 2 is a photograph showing the appearance of a heat-conductive portion used in the present invention after heating in air at 850 c for 10 hours.
Detailed Description
The present invention will now be described more fully hereinafter. Those skilled in the art will be able to implement the invention based on these teachings. It is to be noted in particular that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only examples of a part of the present invention, and not all examples. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The terms "consisting essentially of … …", "comprising", and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
[ curved glass Hot bending Molding Structure ]
As shown in fig. 1, the curved glass hot bending structure of the present invention is arranged on a hot bending machine, and comprises: a heating section for generating a high temperature required for softening a glass blank; a molding section for pressing the softened glass blank to mold the glass blank into curved glass; and a heat conduction portion provided between the heating portion and the molding portion for conducting heat generated by the heating portion to the molding portion.
Specifically, the heating part includes a pair of upper heating plate 21 and lower heating plate 22 which can move relatively under the action of the distance control mechanism 11, the forming part includes an upper forming mold 41 located below the upper heating plate 21 and a lower forming mold 42 located above the lower heating plate 22 and adapted to the upper forming mold 41, and the heat conducting part includes an upper heat conducting plate 31 located between the upper heating plate 21 and the upper forming mold 41 and a lower heat conducting plate 32 located between the lower heating plate 22 and the lower forming mold 42.
The upper heat conducting plate 31 is mounted on the lower surface of the upper heating plate 21, the lower heat conducting plate 32 is mounted on the upper surface of the lower heating plate 22, and a cavity for placing a glass blank and performing press molding on the softened glass blank is formed between the upper forming mold 41 and the lower forming mold 42.
In addition, the upper heating plate 21 further includes a heating plate body made of stainless steel and heating pipes 51 installed in the heating plate body at intervals, and the lower heating plate 22 further includes a heating plate body made of stainless steel and heating pipes 52 installed in the heating plate body at intervals.
The upper forming die 41 and the lower forming die 42 are both made of graphite, wherein the lower forming die 42 is a male die, the upper forming die 41 is a female die, a convex part of the male die is matched with a groove part of the female die, when the curved glass hot-bending forming structure is in a pressing preparation state, a glass blank is clamped between the male die and the female die which are not matched, and after the glass blank is heated and softened, the glass blank is bent and deformed through the matching motion of the male die and the female die, so that the curved glass hot-bending forming is realized.
After the curved glass hot bending forming structure is installed on a hot bending machine, the upper heating plate 21 is installed below the distance control mechanism 11, and the distance control mechanism 11 is arranged on the hot bending machine and can drive the upper heating plate 21 and the upper heat conducting plate 31 to move up and down under the action of the driving mechanism; meanwhile, a lower heating plate 22 and a lower heat conductive plate 32 are provided on the support structure of the hot bending machine from the bottom up and correspond to the upper heating plate 21 and the upper heat conductive plate 31.
[ METHOD FOR PRODUCING CURVED GLASS ]
The method comprises the following steps:
firstly, assembling a curved glass hot bending forming structure into a pressing preparation state, wherein a glass blank is arranged between an upper forming die 41 and a lower forming die 42;
then, the upper heating plate 21 and the lower heating plate 22 are moved toward each other by the distance control mechanism 11, so that the upper heating plate 21 and the upper heat conduction plate 31 are sequentially attached to the upper side of the upper forming mold 41 from top to bottom, the lower heating plate 22 and the lower heat conduction plate 32 are sequentially attached to the lower side of the lower forming mold 42 from bottom to top, and simultaneously, the upper heating plate 21 and the lower heating plate 22 transfer heat to the upper forming mold 41 and the lower forming mold 42 through the upper heat conduction plate 31 and the lower heat conduction plate 32, respectively, to soften the glass blank contained in the cavity;
thereafter, the distance between the upper heating plate 21 and the lower heating plate 22 is further controlled by the distance control mechanism 11 to further press the upper forming mold 41 and the lower forming mold 42 to move the upper forming mold 41 and the lower forming mold 42 in the mold closing direction, so that the softened glass blank is press-molded to form the glass blank into curved glass;
and finally, cooling the mold, and taking out the curved glass product from the mold after cooling.
In the heating, pressing and other processes, the curved glass hot bending forming structure is required to be placed under the nitrogen protection atmosphere to reduce or even prevent air from contacting with a heat conducting plate, a mold and the like, so that the parts are effectively prevented from being oxidized and corroded at high temperature.
[ Upper heating plate and lower Heat conducting plate ]
In one group of embodiments (embodiments 1-7) of the present invention, the upper heating plate and the lower heat-conducting plate of the curved glass hot-bending formation structure are both made of Ti (C, N) -based cermet. In this group of embodiments, the method of manufacturing each of the upper heating plate and the lower heat conducting plate comprises the steps of:
1) preparation of the powder mixture
Preparing raw materials into a powder mixture according to the Ti (C, N) -based metal ceramic to be obtained;
2) pressing
Preparing the powder mixture into a compact by pressure forming;
3) sintering
Sintering the pressed blank to obtain a heat-conducting plate blank;
4) machining
And the upper heating plate and the lower heat conducting plate which have the size and shape composite assembly requirements are obtained through machining.
Step 1) of examples 1-7 is specifically as follows:
A. the raw material components and contents (weight percentages) of examples 1 to 7 are shown in table 1.
TABLE 1
| Example numbering | Ti (C, N) powder | Iron group metals | Carbides of transition metals |
| Example 1 | 10％ | Ni:25％；Co:20％ | WC:20％；Mo2C:20％；TaC:5％ |
| Example 2 | 25％ | Ni:15％；Co:15％ | WC:20％；Mo2C:20％；TaC:5％ |
| Example 3 | 50％ | Ni:6％；Co:6％ | WC:30％；TaC:8％ |
| Example 4 | 50％ | Ni:6％；Co:6％ | WC:20％；Mo2C:10％；TaC:8％ |
| Example 5 | 60％ | Ni:12％；Co:10％ | WC:10％；Mo2C:6％；NbC:2％ |
| Example 6 | 70％ | Ni:11％；Co:10％ | WC:6％；Mo2C:3％ |
| Example 7 | 90％ | Ni:5％；Co:3％ | WC:2％ |
B. The raw materials of examples 1-7 were respectively put into a ball mill for ball milling at a ball-to-material ratio of 8:1 and a rotational speed of 30 rpm for 70 hours, and anhydrous ethanol was used as a wet milling medium to obtain a uniform mixed slurry after ball milling. The mixed slurries of examples 1-7 were then separately spray granulated to obtain dry, well flowable granules of the blend, thereby completing the preparation of the powder blends of examples 1-7.
The steps 2) of examples 1 to 7 were all formed by cold static press at a pressure of 200 MPa.
The step 3) of the examples 1 to 7 all adopt vacuum sintering, the sintering temperature is 1480 ℃, and the heat preservation time is 3 hours.
The upper heating plate and the lower heat-conducting plate of examples 1 to 7 were obtained by the above methods, respectively.
[ Performance comparison of Upper heating plate and lower Heat conducting plate ]
The performance of the upper heating plate/lower heat-conducting plate of examples 1 to 7 was tested and curved glass was manufactured, respectively, according to the above-described manufacturing method of curved glass. The results are shown in Table 2.
TABLE 2
As shown in table 2, the upper/lower heat-conductive plates used in examples 1 to 7 of the present invention are significantly superior to those using 310S stainless steel, WC — Co cemented carbide, and SiC ceramic in hardness and flexural strength.
The oxidation test of heating in air at 850 ℃ for 14 hours showed that the weight increase in oxidation weight of the upper heat-conducting plate/lower heat-conducting plate used in examples 1 to 7 of the present invention was 12mg/m2Hereinafter, the amount of the fraction is only 5mg/m2About, significantly lower than 3000mg/m achieved by adopting upper/lower heat-conducting plates of WC-Co hard alloy2Level (since the high temperature corrosion resistance of 310S stainless steel and SiC ceramic is relatively ideal, the high temperature oxidation test was not performed on the upper/lower heat-conducting plates using 310S stainless steel and SiC ceramic).
Fig. 2 is a photograph showing the appearance of the upper heat-conducting plate used in example 1 after heating in air at 850 c for 10 hours, and it can be seen from fig. 2 that the surface of the heat-conducting plate still maintains the glittering effect.
The upper thermal conductive plate/lower thermal conductive plate used in examples 1 to 7 of the present invention had a thermal conductivity of 25Wm-1k-1On the left and right, lower than the upper/lower plate using WC-Co cemented carbide and SiC ceramic but higher than the upper/lower plate using 310S stainless steel, however, the upper/lower plate used in examples 1 to 7 of the present invention has a thermal conductivity close to that of the current upper/lower heating plate and a thermal expansion coefficient closer to that of the upper/lower heating plate than that of the upper/lower plate using WC-Co cemented carbide and SiC ceramic.
In addition, the upper/lower thermal conductive plates used in examples 1 to 7 of the present invention have a high specific heat capacity, and thus have high thermal conductivity uniformity.
It can be seen that the upper/lower thermal conductive plates used in embodiments 1-7 of the present invention achieve the desired high-temperature chemical stability and high-temperature mechanical properties at the same time, and have better usability compared to the upper/lower thermal conductive plates currently and predominantly using 310S stainless steel, WC-Co cemented carbide, and SiC ceramics.
Of the upper/lower conductive plates used in examples 1-7 of the present invention, examples 4-6, and especially examples 4-5, had the best overall performance for the upper/lower conductive plates, and the reason was determined primarily by the composition of the Ti (C, N) -based cermet.
Claims (10)
1. Curved surface glass hot bending forming structure includes:
a heating section for generating a high temperature required for softening a glass blank;
a molding section for pressing the softened glass blank to mold the glass blank into curved glass; and
a heat conduction portion provided between the heating portion and the molding portion for conducting heat generated by the heating portion to the molding portion;
the method is characterized in that: the heat-conducting portion is mainly composed of Ti (C, N) -based cermet, or
The heat conducting portion has a protective layer mainly composed of a Ti (C, N) -based cermet;
the Ti (C, N) -based cermet comprises the following components in percentage by weight:
10-90% of Ti (C, N) hard phase,
6-45% of a binder phase of an iron group metal, and
2-45% of a transition metal carbide strengthening phase, wherein
The iron group metal bonding phase comprises one or more of Fe, Co, Ni and Cr,
the transition metal carbide strengthening phase comprises WC and Mo2C. One or more of TaC and NbC.
2. The curved glass hot-bending forming structure according to claim 1, wherein: the Ti (C, N) -based cermet comprises the following components in percentage by weight:
50-70% of Ti (C, N) hard phase,
10-25% of a binder phase of an iron group metal, and
the remaining weight percent of a transition metal carbide strengthening phase, wherein
The transition metal carbide phase contains at least WC and Mo2C, a first carbide of a carbon element,
among the first carbides, WC and Mo2The weight ratio of C is 1-3.
3. The curved glass hot-bending forming structure according to claim 2, wherein: the transition metal carbide phase further comprises a second carbide of at least one of TaC and NbC, wherein the second carbide is 8-25% of the total weight of the transition metal carbide phase.
4. The curved glass hot-bending structure according to any one of claims 1 to 3, wherein: the heating part comprises a pair of upper heating plate and lower heating plate which can move relatively under the action of the distance control mechanism;
the forming part comprises an upper forming die positioned below the upper heating plate and a lower forming die positioned above the lower heating plate and matched with the upper forming die, and a cavity for placing a glass blank and performing compression forming on the softened glass blank is formed between the upper forming die and the lower forming die;
the heat conducting part comprises an upper heat conducting plate and a lower heat conducting plate, the upper heat conducting plate is located between the upper heating plate and the upper forming die, the lower heat conducting plate is located between the lower heating plate and the lower forming die, the upper heat conducting plate is installed on the lower surface of the upper heating plate, and the lower heat conducting plate is installed on the upper surface of the lower heating plate.
5. The heat conducting part of the curved glass hot bending forming structure is arranged between a heating part for generating high temperature required by softening a glass blank and a forming part for pressing the softened glass blank to form the glass blank into curved glass, and is used for conducting heat generated by the heating part to the forming part, and the curved glass hot bending forming structure is characterized in that: the heat-conducting portion is mainly composed of a Ti (C, N) -based cermet or has a protective layer mainly composed of a Ti (C, N) -based cermet;
the Ti (C, N) -based cermet comprises the following components in percentage by weight:
10-90% of Ti (C, N) hard phase,
6-45% of a binder phase of an iron group metal, and
2-45% of a transition metal carbide strengthening phase, wherein
The iron group metal bonding phase comprises one or more of Fe, Co, Ni and Cr,
the transition metal carbide strengthening phase comprises WC and Mo2C. One or more of TaC and NbC.
6. A heat transfer portion of a curved glass hot-bending forming structure according to claim 5, wherein: the Ti (C, N) -based cermet comprises the following components in percentage by weight:
50-70% of Ti (C, N) hard phase,
10-25% of a binder phase of an iron group metal, and
the remaining weight percent of a transition metal carbide strengthening phase, wherein
The transition metal carbide phase contains at least WC and Mo2C, a first carbide of a carbon element,
among the first carbides, WC and Mo2The weight ratio of C is 1-3.
7. A heat transfer portion of a curved glass hot-bending forming structure according to claim 6, wherein: the transition metal carbide phase further comprises a second carbide of at least one of TaC and NbC, wherein the second carbide is 8-25% of the total weight of the transition metal carbide phase.
8. A heat-conductive portion of a curved glass hot-bending molding structure according to claim 5 or 6, characterized in that: the iron group metal bonding phase is composed of Ni and Co, and the weight ratio of Ni to Co is 0.5-1.5.
9. A heat-conductive portion of a curved glass hot-bending molding structure according to claim 5 or 6, characterized in that: the heat conducting part is a heat conducting plate.
10. A method of manufacturing curved glass, the method comprising the steps of:
I. setting the forming structure of any one of claims 1 to 4 in a press-ready state;
II, heating the forming part by the heating part through the heat conducting part to soften the glass blank contained in the forming part;
and III, pressing the softened glass blank by using a forming part to form the glass blank into the curved glass.
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| CN108503194A (en) * | 2018-06-01 | 2018-09-07 | 深圳雅素达电子科技有限公司 | Change the temperature control heating device of the glass bending equipment of heating and assembly method |
| CN109881070B (en) * | 2019-03-08 | 2021-05-11 | 广东工业大学 | Metal ceramic with high hardness and high toughness and preparation method and application thereof |
| CN114685037A (en) * | 2020-12-30 | 2022-07-01 | 富联裕展科技(深圳)有限公司 | Curved surface forming method and curved surface forming device for substrate |
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