CN118084310A - Mold and method suitable for baking and bending glass of 3D vehicle-mounted cover plate - Google Patents

Abstract

The application provides a die and a method suitable for baking and bending glass of a 3D vehicle-mounted cover plate, wherein the die comprises the following steps: the die assembly comprises a die plate body, a 3D glass accommodating groove is formed in one side of the die plate body, a supporting surface and an air flow groove are formed in the bottom surface of the 3D glass accommodating groove, and the supporting surface is higher than the upper surface of the air flow groove. The technical scheme of the application effectively solves the problems that heat and gas between the dies cannot be discharged rapidly, and glass is extruded to form damage on the surface in the prior art.

Description

Mold and method suitable for baking and bending glass of 3D vehicle-mounted cover plate

Technical Field

The invention relates to the technical field of transfer windows, in particular to a die and a method for baking and bending glass of a 3D vehicle-mounted cover plate.

Background

At present, 3D glass is widely applied, 3D vehicle-mounted cover plate glass is formed by performing hot bending treatment on traditional 2D glass to enable the glass to have different visual effects, meanwhile, the aesthetic feeling of the appearance of a vehicle is improved, the glass gradually becomes an indispensable part in the manufacturing industry of the vehicle-mounted cover plate, the process of the 3D glass hot bending is generally used for forming glass with a certain shape and outline by die closing and extrusion of an upper die and a lower die,

In some prior art, heat and gas between the molds cannot be rapidly exhausted, and the glass is extruded to form damage on the surface. A patent application of a vehicle-mounted 3D glass processing mold with application number 202310191228.2.

Disclosure of Invention

The invention aims to solve the technical problems that: heat and gas between the molds cannot be rapidly discharged, and the glass is extruded to form damage on the surface of the glass.

In order to solve the above technical problems, an embodiment of the present application provides a mold suitable for baking and bending glass of a 3D vehicle-mounted cover plate, including: the die assembly comprises a die plate body, a 3D glass accommodating groove is formed in one side of the die plate body, a supporting surface and an air flow groove are formed in the bottom surface of the 3D glass accommodating groove, and the supporting surface is higher than the upper surface of the air flow groove.

In some embodiments, the support surface comprises a support surface of an edge of the 3D glass accommodating groove and a support boss surface positioned inside the support surface, and air flow grooves are arranged between adjacent support bosses and between the support boss and the support surface.

In some embodiments, the width of the support ledge is greater than the width of the air flow slot.

In some embodiments, the support surface is compatible with the surface of the 3D glass.

The embodiment of the application also provides a method suitable for baking and bending glass of the 3D vehicle-mounted cover plate, which comprises the following steps of: and S10, placing the processed glass into a mold. S20, pushing the mold with the glass into the heating bin. S30, closing the heating cabin door and filling nitrogen. And S40, heating to soften the glass, attaching the glass to the mold, and annealing and cooling. S50, detection.

In some embodiments, in step 20, both the upper and lower heating plates of the heating chamber are heated to 280 ℃ to 340 ℃ before pushing the glass-filled mold into the heating chamber.

In some embodiments, in step S30, the method further comprises a first incubation period of 28 minutes or more.

In some embodiments, the warming includes a first warming stage that warms up to 480 ℃ to 530 ℃ and a second warming stage that warms up to 560 ℃ to 590 ℃.

In some embodiments, the holding time period is above 28 minutes after the temperature of the first warming stage rises to the target value, and the holding time period is between 85 minutes and 120 minutes after the temperature of the second warming stage rises to the target value.

In some embodiments, the temperature of the annealing soak in step S40 is between 330 ℃ and 380 ℃ and the annealing soak time is between 27 minutes and 35 minutes.

According to the technical scheme, only one side of the die plate body is provided with the 3D glass accommodating groove, when the glass is placed into the die for heating, the glass can be slowly softened in the heating process, the periphery of the glass can be contacted with the die in advance, the softened glass is supported by the supporting surface, heat and gas at the bottom of the glass can be discharged through the airflow groove, so that the glass naturally sinks due to gravity, and the effect of baking, bending and forming of the 3D glass can be achieved without applying pressure by the die. The technical scheme of the application effectively solves the problems that heat and gas between the dies cannot be discharged rapidly, and glass is extruded to form damage on the surface in the prior art.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a schematic diagram of a mold for glass cullet baking for a 3D vehicle-mounted cover plate according to the present embodiment of the application;

fig. 2 shows a flow diagram of a method of an embodiment of the application.

Reference numerals illustrate:

10. a mold assembly; 11. a mold plate body; 12.a 3D glass accommodating groove; 13. a support surface; 131. a support surface at the edge of the 3D glass receiving groove; 132. supporting the raised table top; 14. and a flow groove.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, which may be embodied in many different forms and not limited to the specific embodiments disclosed herein, but rather to include all technical solutions falling within the scope of the claims.

These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

In the description of the present application, unless otherwise indicated, the meaning of "plurality of" means greater than or equal to two; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. When the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.

Furthermore, the use of the terms first, second, and the like in the present application are not used for any order, quantity, or importance, but rather are used for distinguishing between different parts. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements.

It should also be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art. When a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device.

All terms used herein have the same meaning as understood by one of ordinary skill in the art to which the present application pertains, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.

As shown in fig. 1, the present application shows a mold suitable for glass bending of a 3D vehicle-mounted cover plate, comprising: the mold assembly 10, the mold assembly 10 includes a mold plate 11, one side of the mold plate 11 is provided with a 3D glass accommodating groove 12,3D, the bottom surface of the glass accommodating groove 12 has a supporting surface 13 and an air flow groove 14, and the supporting surface 13 is higher than the upper surface of the air flow groove 14.

By applying the technical scheme of the application, only one side of the die plate 11 is provided with the 3D glass accommodating groove 12, when the glass is put into the die for heating, the glass can be slowly softened in the heating process, the periphery of the glass can be contacted with the die in advance, the softened glass is supported by the supporting surface 13, and the heat and gas at the bottom of the glass can be discharged through the gas flow groove 14, so that the glass naturally sinks due to gravity, and the effect of baking and bending forming of the 3D glass can be achieved without applying pressure by the die. The technical scheme of the application effectively solves the problems that heat and gas between the dies cannot be discharged rapidly, and glass is extruded to form damage on the surface in the prior art.

As shown in fig. 1, the supporting surface 13 includes a supporting surface 131 at the edge of the 3D glass accommodating groove and a supporting boss surface 132 located inside the supporting surface, and the air flow grooves 14 are disposed between the adjacent supporting boss and the supporting surface 13. The supporting surface 131 of the edge of the 3D glass receiving groove serves to support the softened glass naturally falling down due to the dead weight, so as to mold the same. The setting of the inside support boss face 132 of holding surface 13 makes owing to under the shaping of glass softening dead weight, the hot-air of glass below can be through air current groove reposition of redundant personnel heat and gas between holding surface 13 and the support boss, all be provided with air current groove 14 between adjacent support boss and the holding surface 13, the support boss evenly sets up, such setting makes the degree of depth and the width of air current groove 14 the same, let heat and gas evenly flow, realize soaking, at the fashioned in-process of glass, laminating 3D glass accommodation groove 12 that can be better satisfies the management and control requirement to product face profile. When the glass reaches the softening temperature, heat and gas at the bottom of the glass can be discharged through the airflow grooves, and the softened glass is molded on the supporting convex table 132, so that no upper mold pressure is applied, no appearance (concave-convex points, indentation and indentation) defects are generated on the surface, and the yield after hot bending is increased. Meanwhile, due to the design of the supporting boss, the contact area between the glass surface and the die is reduced, the smaller the contact area is, the smaller the risk of generating concave-convex points on the softened glass surface is in a high-temperature state, and the defective rate is reduced. The support boss 132 is not limited to a rectangular shape, but may be a cylindrical shape or a spherical shape. The upper edge of the supporting surface 13 is subjected to the dulling treatment, so that the glass is prevented from being scratched due to sharp edges.

As shown in fig. 1, in the solution of the present application, the width of the supporting land 132 is greater than the width of the air flow groove 14. The width of the air flow groove 14 is a, the width of the supporting boss 132 is b, and b is more than or equal to 1.4a and less than or equal to 3.8a, and the arrangement is that the supporting boss 132 increases in width, so that the pressure on the supporting boss is reduced, the risk of indentation on glass is reduced, meanwhile, the width b of the supporting boss 132 does not exceed 3.8a, a relatively large gap is reserved for the air flow groove 14, and the effect of the air flow groove 14 is not influenced due to the overlarge volume of the supporting boss. The air flow groove 14 also extends to the supporting surface 13 at the edge of the 3D glass accommodating groove, and the extending direction faces the side elevation of the 3D glass accommodating groove 12, so that the air is further conveniently discharged.

As shown in fig. 1, in the technical solution of the present application, the supporting surface 13 is adapted to the surface of the 3D glass. This arrangement allows the support surface 13 to cooperate with the 3D glass receiving recess 12 to achieve the desired shape of the 3D glass.

As shown in fig. 2, the application further provides a method for baking and bending glass for a 3D vehicle-mounted cover plate, which comprises the following steps: s10, putting the processed glass into a mold, S20, pushing the mold with the glass into a heating bin, S30, closing the heating bin door, charging nitrogen, S40, heating until the glass is softened and attached to the mold, and carrying out annealing and cooling; s50, detection.

By adopting the method, the glass is firstly subjected to omnibearing inspection, the glass has good quality, the problems of cracks, bubbles, defects and the like cannot be solved, the surface of the glass is kept clean, dust or dirt is not required, otherwise the heat transfer effect is affected, the processed glass is put into a mould, the position is adjusted to be completely matched with the mould, the phenomenon of abrasion, edge burst or pimple is not allowed to occur at the interface of the processed glass and the mould, the mould with the glass is pushed into a heating bin for heating, then nitrogen is filled, other inert gases can be filled, the inert gases are relatively stable, the reaction with the heated glass is difficult to generate, meanwhile, the thermal conductivity is poor, the temperature is kept accurate and stable, and the glass has a certain explosion-proof function and an oxidation-proof function. A certain heating residence time is reserved before heating, so that the temperature of the die and the temperature of the heating plate can be increased simultaneously, and glass breakage caused by uneven temperature is prevented. And heating the glass to soften the glass to a high-elastic state, attaching the glass to a die through self gravity, and then annealing and cooling to cool and shape the glass. And finally, transferring the glass which is baked and bent out of the hot bending device, detecting and marking the glass which is baked and bent completely, and then classifying and collecting the glass which is detected to be qualified and unqualified.

In the technical scheme of the application, in the step S20, before the mould with glass is pushed into the heating bin, the upper heating plate and the lower heating plate of the heating bin are heated to 280-340 ℃. The uniform heating of the upper heating plate and the lower heating plate is used for preventing the partial property difference of glass possibly caused by the non-uniform temperature rising, possibly causing the inconsistent physical and chemical properties of formed glass and even the damage condition, and the preheating temperature can be determined according to the components of the glass which needs to be heated and bent.

In the technical scheme of the application, in the step S30, the method further comprises the step of first heat preservation, wherein the heat preservation duration is more than 28 minutes. The temperature rising residence time is used for carrying out the second temperature rising after the temperature of the die is the same as that of the heating plate, so that the defects of breakage, pitting and the like of glass caused by inconsistent temperatures of the die and the heating plate can be avoided. Meanwhile, the heat preservation duration is more than 28 minutes, the temperature of the die and the temperature of a temperature sensor arranged on the heating bin can be kept consistent, the observation and the detection of staff are facilitated, and the glass hot bending effect is prevented from being bad due to inaccurate temperature. The temperature rise may be completed within 10 minutes of each stage of the temperature rise. The temperature rise is too fast, the temperature rise is inconsistent, the local properties of the glass are easy to be different, and even the situation of breakage occurs. Too slow a temperature rise results in reduced efficiency.

In the technical scheme of the application, the temperature rise comprises a first temperature rise stage and a second temperature rise stage, wherein the first temperature rise stage is heated to 480 ℃ to 530 ℃, and the second temperature rise stage is heated to 560 ℃ to 590 ℃. The glass is divided into a glass state, a high-elastic state and a viscous state in the heating process, the initial material is in a rigid solid state in the continuous heating process, the initial material is similar to the glass, and only very small deformation can occur under the action of external force, and the state is the glass state. When the temperature is continuously increased to 480 ℃ to 530 ℃, the deformation of the material is obviously increased, and the deformation is relatively stable in the subsequent temperature range of 560 ℃ to 590 ℃, and the state is a high-elasticity state. The deformation amount is gradually increased when the temperature is continuously increased, the material gradually becomes viscous fluid, and the state is viscous fluid state, and the deformation is impossible to recover at the moment, so that the temperature needs to be controlled below the viscous fluid state of the glass. The transition between the glassy state and the high-elastic state is called the glass transition, and the transition temperature corresponding to the transition temperature is the glass transition temperature Tg. When the glass state is in a high-elastic state, the hot bending process is matched with the vitrification curve for debugging, and the influences of appearance, size and contour can be simultaneously considered. Depending on the physicochemical properties of the glass, the temperature may be raised to different temperatures, for example, if the Tg of a typical high-alumina silica glass is higher than that of a soda-lime glass, the temperature may be raised to a higher temperature.

In the technical scheme of the application, after the temperature of the first heating stage rises to the target value, the heat preservation time is more than 28 minutes, and after the temperature of the second heating stage rises to the target value, the heat preservation time is 85 to 120 minutes. The first heating and heat preservation enables the die and the heating plate to keep the same temperature and then to carry out second heating, so that the die and the heating plate can reach the temperature for changing the glass from the glass state to the high-elastic state in a certain time, and the temperature of the temperature sensor arranged on the heating bin can be ensured to be consistent with the temperature on the die. The first heat preservation time is too short, so that the temperature of the die and the heating plate can not be kept uniform, or the temperature of the temperature sensor is inconsistent with the temperature of the heating plate, and the time is too long, so that the efficiency is too low. The heat preservation after the second temperature rise to the target value is used for ensuring that the glass completely reaches a high-elastic state, so that the heat preservation duration is not too short, otherwise, the forming effect of the glass is affected. According to the different heat absorption coefficients of the glass with different physicochemical properties, the heating time and the heat preservation time of the glass are increased or reduced proportionally.

In the technical scheme of the application, the temperature of the annealing heat preservation in the step S40 is 330 ℃ to 380 ℃, and the annealing heat preservation time is 27 minutes to 35 minutes. Therefore, the forming of glass can be influenced due to the fact that the cooling speed is too high, the cooling process is carried out slowly, the phenomenon that the glass cracks due to rapid cooling is avoided, and meanwhile, the efficiency can be influenced due to the fact that the cooling process is too slow.

The time-temperature relationship ratio of the molding of glass of various materials and different shapes is different. According to the respective actual conditions, the accurate grasp can be realized through multiple tests. In other embodiments, the application adopts soda lime glass, and other different glasses with different Tg can be adopted, and the time for heating and the time for heat preservation are different, for example, pits or deformation can be generated due to the too high temperature, insufficient hot bending formation can be caused due to the too low temperature, and the application needs to be verified through experiments.

The following is a description of specific embodiments:

In the technical solution of the first embodiment, the method includes the following steps: s10, placing the checked glass into a mold, and adjusting the position of the glass to be completely matched with the mold, wherein the joint of the glass and the mold does not allow abrasion, edge burst or pimple. And S20, before the mould with glass is pushed into the heating bin, heating the upper heating plate and the lower heating plate of the heating bin to 300 ℃, and then pushing the mould with glass into the heating bin, wherein the heating time is 30 minutes. S30, closing the heating cabin door, filling nitrogen, and optionally other inert gases, wherein the first heat preservation is performed at the moment, so that the temperature of the die is kept consistent with the temperature of the upper heating plate and the lower heating plate, and the heat preservation duration is more than 28 minutes. And S40, the temperature is raised to 500 ℃ in the first temperature raising stage, so that the deformation of the glass is obviously increased, the heating time is 30 minutes at the moment, the temperature is raised to 570 ℃ in the second temperature raising stage, the heating time is 90 minutes, the glass state is changed into a high-elasticity state, the deformation is relatively stable, the glass is softened and attached to a die, and the molding is convenient. And then annealing and heat preservation are carried out, wherein the temperature of the annealing and heat preservation is 350 ℃, the cooling process is slowly carried out, and the annealing and cooling time is 30 minutes. S50, detecting and marking the baked and bent complete glass, and then classifying and collecting the glass which is qualified and unqualified in detection.

The second embodiment differs from the first embodiment in that the second heating stage is heated to 580 ℃ in step S40, and the heating time is 90 minutes. At the moment, the appearance, the size and the outline of the processed glass all meet the requirements

The third embodiment differs from the first embodiment in that the second heating stage is heated to 570 ℃ in step S40, and the heating time is 100 minutes. The appearance, the size and the outline of the processed glass meet the requirements.

The fourth embodiment differs from the first embodiment in that the second heating stage in step S40 is heated to 570 ℃ for 110 minutes. The appearance, the size and the outline of the processed glass meet the requirements.

DOE verification proves that when the glass which is bent by heat is soda-lime glass, the first section and the second section are in heating stages, the heating time is preferably 30 minutes, and the size, the outline and the appearance are not qualified in less than 30 minutes. The third section is a molding section, the temperature of the molding section is 580+/-10 ℃ of the softening temperature of the glass, and the molding time is 80+/-10 min. Too low a heating temperature may result in unacceptable or all of the dimensions, contours, or appearance, and too short a holding time may result in imperfections in the contours or poor fit between the glass and the mold. The fourth section is an annealing section, the temperature of the annealing section is required to be lower than 400 ℃ and the annealing section enters a normal-temperature bin, otherwise, the glass can be subjected to arch bridge type deformation. And when the conditions are met, the appearance, the size and the contour of the processed glass meet the requirements.

Thus, various embodiments of the present application have been described in detail. In order to avoid obscuring the concepts of the application, some details known in the art have not been described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict.

Claims (10)

1. Die set suitable for on-vehicle apron of 3D roast curved glass, characterized in that includes:

the mold assembly (10), the mold assembly (10) comprises a mold plate body (11), one side of the mold plate body (11) is provided with a 3D glass accommodating groove (12), the bottom surface of the 3D glass accommodating groove (12) is provided with a supporting surface (13) and an air flow groove (14), and the supporting surface (13) is higher than the upper surface of the air flow groove (14).

2. The mold for glass baking and bending of 3D vehicle cover plate according to claim 1, wherein the supporting surface (13) comprises a supporting surface (131) at the edge of the 3D glass accommodating groove and a supporting boss surface (132) located inside the supporting surface (13), and the airflow grooves (14) are arranged between adjacent supporting bosses and the supporting surface (13).

3. The mold for glass cullet of 3D vehicle cover plate according to claim 2, characterized in that the width of the supporting raised surface (132) is larger than the width of the air flow groove (14).

4. Mould for glass-sheet according to claim 1, characterized in that the support surface (13) is adapted to the surface of the 3D glass.

5. A method of glass cullet bending for a 3D vehicle cover plate, characterized in that a mould according to any one of claims 1 to 4 is adopted, the method comprising the steps of:

S10, placing the processed glass into a mold;

s20, pushing the mold with the glass into a heating bin;

S30, closing a heating cabin door and filling nitrogen;

S40, heating until the glass is softened and attached to the die, and annealing and cooling;

S50, detection.

6. The method of glass cullet baking for a 3D vehicle cover plate according to claim 5, wherein in step 20, both the upper and lower heating plates of the heating chamber are heated to 280 ℃ to 340 ℃ before the glass-filled mold is pushed into the heating chamber.

7. The method for glass bending by baking a 3D vehicle cover plate according to claim 5, wherein in step S30, the method further comprises a first heat preservation period of more than 28 minutes.

8. The method of glass cullet baking for a 3D vehicle cover plate of claim 5, wherein the heating comprises a first heating stage and a second heating stage, the first heating stage heating to 480 ℃ to 530 ℃, the second heating stage heating to 560 ℃ to 590 ℃.

9. The method for baking and bending glass on a 3D vehicle cover plate according to claim 8, wherein the heat-preserving period is more than 28 minutes after the temperature of the first heating stage is raised to the target value, and the heat-preserving period is 85 to 120 minutes after the temperature of the second heating stage is raised to the target value.

10. The method for glass bending by baking a 3D vehicle cover plate according to claim 8, wherein the temperature of the annealing and heat preservation in the step S40 is between 330 ℃ and 380 ℃ and the annealing and heat preservation time is between 27 minutes and 35 minutes.