CN113442415B - Automatic forming method for large windshield - Google Patents
Automatic forming method for large windshield Download PDFInfo
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- CN113442415B CN113442415B CN202110768042.XA CN202110768042A CN113442415B CN 113442415 B CN113442415 B CN 113442415B CN 202110768042 A CN202110768042 A CN 202110768042A CN 113442415 B CN113442415 B CN 113442415B
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- oven
- forming
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- glass
- forming oven
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Classifications
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- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/261—Handling means, e.g. transfer means, feeding means
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/46—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention discloses an automatic forming method of a large windshield, belongs to the field of aviation product manufacturing, solves the problem that the prior art is difficult to meet the requirement of large-scale surface glass production, and comprises the following steps: a. mounting a forming tool on a forming oven; b. pulley blocks are arranged at all positions of the forming oven; c. mounting the glass blank on a forming tool; d. opening a forming oven for heat preservation, sequentially increasing the weights of the balancing weights on the two side surfaces, and performing; e. opening the forming oven for resetting; f. heating the forming oven to a specified temperature, and preserving heat; g. starting the hydraulic station and opening the air inlet valve; h. closing the oven, measuring the outline of the glass, and adjusting the position of the glass; i. introducing hot compressed air, and keeping the temperature; j. adjusting the set temperature, continuing heating and preserving heat, and observing internal deformation to enable the glass profile to meet the requirements of the external profile; k. the oven heating was stopped and the air pressure and temperature were reduced. The invention is used for manufacturing large aviation organic glass, and has high production controllability and high product yield.
Description
Technical Field
The invention belongs to the technical field of aviation product manufacturing, and particularly relates to an automatic forming method of a large windshield.
Background
The aviation organic glass is an organic transparent structural material used for parts such as a canopy, a windshield, an engine room, a porthole and the like of an airplane; the plate-shaped product is prepared by using methyl methacrylate as a main body and adopting a bulk polymerization method, is molded and processed into a transparent piece, and is installed on an airplane. It has excellent optical, strength, heat resistance, ageing resistance and ultraviolet ray resistance, and especially has small optical distortion and angular displacement. The compression strength, the impact strength and the bending strength of the organic glass are all higher than those of common organic glass. Especially, the impact strength of the oriented plate is more than twice of that of the common organic glass plate, and the oriented plate also has high silver mark resistance and crack propagation resistance. The use as an aircraft cockpit cover prevents sudden air burst.
For products with large shapes, a blow molding mode is adopted for ensuring the shapes of the surfaces, but the existing blow molding method cannot meet the production of some large-shape glass, and a new production method needs to be designed to meet the production requirements of the products.
Disclosure of Invention
The invention aims to:
in order to solve the problem that the production of large-sized surface glass is difficult to meet by the forming method of aviation organic glass in the prior art, the automatic forming method of the large windshield is provided.
The technical scheme adopted by the invention is as follows:
an automatic forming method of a large windshield comprises the following steps:
a. installing a forming tool on a forming oven, setting the distance between the edge of the tool and the forming oven, starting a hydraulic station of the forming oven, setting output pressure, debugging a hydraulic cylinder, and checking the air tightness of an air pipe of the forming oven;
b. installing pulley blocks at each position of the forming oven, installing steel wire ropes on the pulley blocks and the forming oven according to lines, and hanging balancing weights on the steel wire ropes to tighten the steel wire ropes;
c. a high-temperature-resistant cotton rope penetrates through the balance weight hole in the glass blank piece and is knotted around the ring, the glass blank piece is installed on a forming tool, and the position of the glass blank piece is adjusted to be aligned with the central axis;
d. hooking a high-temperature-resistant cotton rope by using a steel wire rope with a hook, closing a forming oven, opening a cooling water channel, opening the forming oven, keeping the temperature after meeting the temperature requirement, and simultaneously sequentially increasing the weights of the weights on the two sides to ensure that the two sides of the glass blank piece are uniformly stressed so as to perform the glass blank piece;
e. observing the bending shape of the glass blank, bending until the glass blank is attached to the inner mold block, the surface is not eliminated, the surface is smooth, the edge part is not greatly deformed, namely the glass blank is qualified, closing the forming oven and performing auxiliary heating, opening the forming oven, entering the forming oven to reset the rear end pressing frame, and inserting the pins into the assembly holes of the front and rear end pressing frames and the movable arm rod;
f. closing the oven, raising the temperature of the forming oven to a specified temperature, and preserving heat;
g. starting a hydraulic station, starting a hydraulic control system, adjusting output pressure, starting die assembly, opening an air inlet valve, and introducing hot compressed air through an air inlet pipe until the air pressure reaches the standard;
h. closing the forming oven, measuring the outline of the glass, adjusting the position of the glass, drawing a marked side line on the glass along the pressing frame, and opening the forming oven;
i. introducing hot compressed air along with the rise of the temperature in the forming oven, and preserving heat after reaching the required pressure value and temperature;
j. after the heat preservation time is up, adjusting the set temperature of the forming oven, continuing to heat and preserve heat, introducing hot compressed air after heat preservation is finished, observing internal deformation, and enabling the gap between the outer glass profile and the sample plate to be uniform;
k. if the deformation meets the shape requirement, stopping heating the oven, closing an external air pressure valve, keeping the air pressure in the mold cavity, naturally cooling the surface temperature of the glass to room temperature, reducing the air pressure and temperature in a gradient manner along with the time, and opening the oven door.
Furthermore, at least 2.5kg of balancing weight is adopted in the step b, and the end part of the steel wire rope is clamped by a chuck after the steel wire rope is installed.
And furthermore, the high-temperature-resistant cotton rope adopted in the step c is 600-800 mm, the high-temperature-resistant cotton rope is wound in the counterweight hole for at least 3 circles and then is knotted end to end, and the high-temperature-resistant cotton rope is twisted into a twisted shape.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the invention, a large-scale forming oven and a forming tool are adopted for assistance, a blank glass piece is accurately positioned in the blank glass piece, and is uniformly stressed and deformed in the forming process, the glass is preliminarily deformed in the process through the preforming step, the problem that the large-scale glass is easily deformed and non-uniform in one-step forming is avoided, the technical problem that the large-scale glass is difficult to manufacture and form is also overcome, the precise forming and manufacturing of the large-scale windshield glass are realized, the process controllability is high, even if the deformation non-uniform part exists in the blow molding process, the local adjustment can be carried out through the operation of the forming oven, and the shape of a finished product is ensured to meet the standard requirement through a plurality of process steps.
According to the invention, the high-temperature-resistant cotton rope and the steel wire rope are used for applying tension to the glass piece, and the balance weight is gradually and uniformly increased to form the glass piece on the forming block on the forming tool, so that the pressure and temperature regulation and control in the process can be conveniently operated, and the production stability and safety are high.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An automatic forming method of a large windshield comprises the following steps:
a. installing a forming tool on a forming oven, setting the distance between the edge of the tool and the forming oven, starting a hydraulic station of the forming oven, setting output pressure, debugging a hydraulic cylinder, and checking the air tightness of an air pipe of the forming oven;
b. installing pulley blocks at all positions of the forming oven, installing steel wire ropes on the pulley blocks and the forming oven according to lines, and hanging balancing weights on the steel wire ropes to enable the steel wire ropes to be tightened;
c. a high-temperature-resistant cotton rope penetrates through the balance weight hole in the glass blank piece and is knotted around the ring, the glass blank piece is installed on a forming tool, and the position of the glass blank piece is adjusted to be aligned with the central axis;
d. hooking a high-temperature-resistant cotton rope by using a steel wire rope with a hook, closing a forming oven, opening a cooling water channel, opening the forming oven, keeping the temperature after meeting the temperature requirement, and simultaneously sequentially increasing the weights of the counter weights on the two sides to ensure that the two sides of the glass blank piece are uniformly stressed so as to perform the glass blank piece;
e. observing the bending shape of the glass blank, bending until the glass blank is attached to the inner mold block, the surface is not eliminated, the surface is smooth, the edge part is not greatly deformed, namely the glass blank is qualified, closing the forming oven and performing auxiliary heating, opening the forming oven, entering the forming oven to reset the rear end pressing frame, and inserting the pins into the assembly holes of the front and rear end pressing frames and the movable arm rod;
f. closing the oven, raising the temperature of the forming oven to a specified temperature, and preserving heat;
g. starting a hydraulic station, starting a hydraulic control system, adjusting output pressure, starting die assembly, opening an air inlet valve, and introducing hot compressed air through an air inlet pipe until the air pressure reaches the standard;
h. closing the forming oven, measuring the outline of the glass, adjusting the position of the glass, drawing a marked edge line on the glass along the pressing frame, and starting the forming oven;
i. introducing hot compressed air along with the rise of the temperature in the forming oven, and preserving heat after reaching the required pressure value and temperature;
j. after the heat preservation time is up, adjusting the set temperature of the forming oven, continuing to heat and preserve heat, introducing hot compressed air after heat preservation is finished, observing internal deformation, and enabling the gap between the outer glass profile and the sample plate to be uniform;
k. and if the deformation meets the shape requirement, stopping heating the oven, closing an external air pressure valve, keeping the air pressure in the mold cavity, naturally cooling the surface temperature of the glass to room temperature, reducing the air pressure and the temperature in a gradient manner along with time, and opening the oven door.
The large-scale forming oven and the forming tool are adopted for assistance, blank glass pieces are accurately positioned in the blank glass pieces, uniform stress deformation is realized in the forming process, glass is preliminarily deformed in the process through the preforming step, the problem that large-scale glass is easy to deform unevenly in one-time forming is avoided, the technical problem that large-scale glass is difficult to manufacture and form is also overcome, the accurate forming and manufacturing of large-scale windshield glass are realized, the process controllability is high, even if the deformation uneven part exists in the blow molding process, local adjustment can be carried out through the operation of the forming oven, and the finished product shape is ensured to meet the standard requirements through a plurality of process steps. Exert pulling force through high temperature resistant cotton rope and wire rope to glass spare to evenly increase the counter weight gradually and make its shaping on the shaping piece on the shaping frock, pressure and the temperature regulation and control of in-process can conveniently be operated, and production stability is high and the security is high.
Example 2
On the basis of embodiment 1, preferably, a 2.5kg counterweight is used in the step b, and the end of the steel wire rope is clamped by a chuck after the steel wire rope is installed.
Example 3
On the basis of embodiment 1, preferably, the high temperature resistant cotton rope used in the step c is 600mm, the high temperature resistant cotton rope is knotted end to end after being wound for 3 circles in the weight port, and the high temperature resistant cotton rope is twisted into a twisted shape.
Example 4
On the basis of embodiment 1, preferably, the high temperature resistant cotton rope used in the step c is 700mm, the high temperature resistant cotton rope is knotted end to end after being wound for 4 circles in the weight port, and the high temperature resistant cotton rope is twisted into a twisted shape.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (3)
1. An automatic forming method for a large windshield is characterized by comprising the following steps:
a. installing a forming tool on a forming oven, setting the distance between the edge of the tool and the forming oven, starting a hydraulic station of the forming oven, setting output pressure, debugging a hydraulic cylinder, and checking the air tightness of an air pipe of the forming oven;
b. installing pulley blocks at all positions of the forming oven, installing steel wire ropes on the pulley blocks and the forming oven according to lines, and hanging balancing weights on the steel wire ropes to enable the steel wire ropes to be tightened;
c. a high-temperature-resistant cotton rope penetrates through the balance weight hole in the glass blank piece and is knotted around the ring, the glass blank piece is installed on a forming tool, and the position of the glass blank piece is adjusted to be aligned with the central axis;
d. hooking a high-temperature-resistant cotton rope by using a steel wire rope with a hook, closing a forming oven, opening a cooling water channel, opening the forming oven, keeping the temperature after meeting the temperature requirement, and simultaneously sequentially increasing the weights of the counter weights on the two sides to ensure that the two sides of the glass blank piece are uniformly stressed so as to perform the glass blank piece;
e. observing the bending shape of the glass blank, bending until the glass blank is attached to the inner mold block, the surface is not eliminated, the surface is smooth, the edge part is not greatly deformed, namely the glass blank is qualified, closing the forming oven and performing auxiliary heating, opening the forming oven, entering the forming oven to reset the rear end pressing frame, and inserting the pins into the assembly holes of the front and rear end pressing frames and the movable arm rod;
f. closing the oven, raising the temperature of the forming oven to a specified temperature, and preserving heat;
g. starting a hydraulic station, starting a hydraulic control system, adjusting output pressure, starting die assembly, opening an air inlet valve, and introducing hot compressed air through an air inlet pipe until the air pressure reaches the standard;
h. closing the forming oven, measuring the outline of the glass, adjusting the position of the glass, drawing a marked edge line on the glass along the pressing frame, and starting the forming oven;
i. introducing hot compressed air along with the rise of the temperature in the forming oven, and preserving heat after reaching the required pressure value and temperature;
j. adjusting the set temperature of the forming oven after the heat preservation time is reached, continuing heating and preserving heat, introducing hot compressed air after the heat preservation is finished, observing internal deformation, and enabling the gap between the outer glass profile and the sample plate to be uniform;
k. and if the deformation meets the shape requirement, stopping heating the oven, closing an external air pressure valve, keeping the air pressure in the mold cavity, naturally cooling the surface temperature of the glass to room temperature, reducing the air pressure and the temperature in a gradient manner along with time, and opening the oven door.
2. The method of claim 1, wherein at least 2.5kg of weight is used in step b, and the end of the steel cable is clamped by a chuck after the steel cable is installed.
3. The method as claimed in claim 1, wherein the high temperature resistant cotton rope used in the step c is 600mm-800mm, and the high temperature resistant cotton rope is knotted end to end after being wound at least 3 circles in the weight hole, and twisted into a twist shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110768042.XA CN113442415B (en) | 2021-07-07 | 2021-07-07 | Automatic forming method for large windshield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110768042.XA CN113442415B (en) | 2021-07-07 | 2021-07-07 | Automatic forming method for large windshield |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113442415A CN113442415A (en) | 2021-09-28 |
| CN113442415B true CN113442415B (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110768042.XA Active CN113442415B (en) | 2021-07-07 | 2021-07-07 | Automatic forming method for large windshield |
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| CN (1) | CN113442415B (en) |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FI44932C (en) * | 1969-08-21 | 1972-02-10 | Artama Arvi | Heating furnace apparatus for heating glass sheets, in particular motor vehicle windscreens, for bending |
| GB1157090A (en) * | 1965-12-02 | 1969-07-02 | Triplex Safety Glass Co | Improvements in or relating to a method and apparatus for Bending Glass in Sheet Form |
| US5279635A (en) * | 1992-01-08 | 1994-01-18 | Libbey-Owens-Ford Co. | Method and apparatus for controlling the temperature of glass sheets in press bending |
| US5882370A (en) * | 1995-06-07 | 1999-03-16 | Pilkington Glass Limited | Method of bending glass sheets |
| FI20035065A (en) * | 2003-05-14 | 2004-11-15 | Tamglass Ltd Oy | Method and oven for bending glass sheets |
| CN101376559B (en) * | 2008-09-25 | 2011-04-20 | 上海耀皮康桥汽车玻璃有限公司 | Post forming bending mould of automobile front wind screen glass |
| CN101948237B (en) * | 2010-05-24 | 2012-05-30 | 福耀玻璃(湖北)有限公司 | Continuous baking and bending formation furnace and continuous baking and bending formation process for front windshield of bus |
| CN202131203U (en) * | 2011-07-05 | 2012-02-01 | 河南思可达光伏材料股份有限公司 | Compacting device for glass calendering machine |
| US8528366B2 (en) * | 2011-12-22 | 2013-09-10 | Sunpower Corporation | Heat-regulating glass bending apparatus and method |
| CN102617027B (en) * | 2012-04-05 | 2014-03-26 | 福耀玻璃工业集团股份有限公司 | System and method for heating automobile glass |
| CN104829101B (en) * | 2015-05-11 | 2018-05-01 | 洛阳兰迪玻璃机器股份有限公司 | A kind of glass tempering furnace compound bending shaping mechanism |
| CN108585452A (en) * | 2018-05-09 | 2018-09-28 | 深圳市太平洋自动化设备有限公司 | Forming method, formation system and the 3D bend glasses of 3D bend glasses |
| CN110467339B (en) * | 2019-08-13 | 2023-08-29 | 洛阳兰迪玻璃机器股份有限公司 | Forming method and equipment for curved toughened glass |
| CN111730850B (en) * | 2020-06-18 | 2023-06-02 | 江苏汤臣新材料科技有限公司 | Uniform pressing method for hemispherical structure of organic glass |
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2021
- 2021-07-07 CN CN202110768042.XA patent/CN113442415B/en active Active
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| CN113442415A (en) | 2021-09-28 |
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