CN114477738A - Thermal forming process for processing automobile glass - Google Patents

Abstract

The invention discloses a thermoforming process for automobile glass processing, which includes the following production steps: S1, preparing glass sheets; S2, then placing the glass in a heating furnace under vacuum conditions and a vacuum degree of ≤2.5MPa Heating, the automotive glass with a thickness of S mm is placed flat and heated to a maximum radius of curvature of 850 mm; where S is a natural number, and the preheating heating temperature is 170 °C; S3, the automotive glass is heated in a continuous heating mode, and the final heating The temperature is constant at 685°C, and the total heating time is T=S×35 seconds; S4, the heated glass is sent into the cooling box. In the heat treatment process of the present invention, the processed glass is reheated, cut by water jet, and gradually heated in layers, and at the same time, the temperature can be rapidly cooled by nitrogen gas or cold air, and the whole heating and cooling process adopts suspension or vertical heating. It is placed straight to ensure the curvature of the glass, the method and process are simple, and the processed products are of high quality and long service life.

Description

A thermoforming process for automotive glass processing

technical field

The invention relates to the technical field of glass processing, in particular to a thermoforming process for automotive glass processing.

Background technique

The production of automotive glass is to heat the glass to a temperature close to the softening temperature in a heating furnace, and then quickly send the glass into the air grids with different cooling intensities to cool the glass unevenly, so that the main viewing area of the glass is different from the surrounding area. Stress, generally the glass produced in this way is regional tempered glass, and the surrounding area is in the strong wind position of the wind grid, so it needs to be fully tempered. The degree of debris in this position is good, and the tempering strength is high. The main viewing area is in the weak and cold position of the wind grid. Large, low tempering strength.

At present, the methods of producing hyperboloid automotive glass are mainly self-weight forming method and compression forming method. The demand for some special-shaped products is also increasing and the quality requirements are becoming more and more strict, and most of the existing automotive glass forming methods are not uniformly heated. , and the forming temperature control process is complicated, which leads to the poor performance of the processed glass as a whole. The above problems need to be improved on the traditional processing technology. Therefore, here we propose a thermoforming process for automotive glass processing.

SUMMARY OF THE INVENTION

The present invention is aimed at the methods for producing hyperboloid automobile glass currently mainly are self-weight forming method and compression forming method, and the demand for some special-shaped products is also increasing and the quality requirements are increasingly strict. Most of the existing automotive glass moldings are not uniform in heating and molding, and the temperature control process for molding is complicated, which leads to the problem of poor performance of the processed glass as a whole. A repairing and tightening facial mask is provided.

The present invention, in order to solve the above-mentioned technical deficiencies, adopts the modified technical scheme, a kind of thermoforming process of automobile glass processing, comprising the following production steps: S1, prepare glass sheet, clean it, and cut into long strips;

S2, then place the glass in a heating furnace for heating under vacuum conditions and a vacuum degree of ≤2.5MPa, and heat the automotive glass with a thickness of S millimeters flat to a maximum radius of curvature of 850 millimeters; among them, S is a natural number, and the preheating temperature is 170℃;

S3, the automobile glass is heated continuously, the final heating temperature is constant at 685°C, and the total heating time is T=S×35 seconds;

S4, the heated glass is sent into a cooling box, the inside of the cooling box is injected with inert gas nitrogen, the flow rate of the input nitrogen is kept at 200ml/min, the temperature is uniformly maintained, and then sent into the processing glass mold.

As a further preferred mode of the present invention, in step S1, the water jet cutting method is used for cutting, the pressure of the water jet cutting jet on the glass is set to 280N, the power is less than 52KW, and the diameter of the cutting jet module is set to 0.35mm.

As a further preferred mode of the present invention, in step S2, during the preheating process, the temperature is slowly increased by maintaining an increment of 5°C per minute, and then kept at 170°C for 15 minutes.

As a further preferred mode of the present invention, in step S3, during the heating process, the first temperature section is at 0-145 °C, the second temperature section is at 145-280 °C, the third temperature section is at 280-685 °C, and During the heating process, the heating rate of the first temperature section was kept increasing at 10°C per minute, the heating rate in the second temperature section was increasing at 15°C per minute, and the heating rate in the third temperature section was increasing at 18°C per minute.

As a further preferred mode of the present invention, in step S4, in the cooling box, the cooling water machine can be used to cooperate with cooling, and the cooling water machine can keep the temperature decreasing by 6-8°C per minute to slowly cool down, and then keep the temperature range at 10- 20°C, and in the cooling box, a sprayer and a humidity sensor can be added to keep the relative humidity of the cooling room under control.

As a further preferred mode of the present invention, in step S4, can also adopt the rapid injection of liquid nitrogen to carry out rapid cooling, and can cooperate with the fan to simultaneously lower the temperature.

Has the following beneficial effects:

In the heat treatment process of the present invention, the processed glass is reheated, cut by water jet, and gradually heated in layers, and at the same time, the temperature can be rapidly cooled by nitrogen gas or cold air, and the whole heating and cooling process adopts suspension or vertical heating. It can be placed upright to ensure the curvature of the glass, the method and process are simple, and the processed products are of high quality and long service life.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

The present invention provides a technical scheme: a thermoforming process for automotive glass processing, comprising the following production steps, S1, preparing a glass sheet, cleaning it, and cutting it into a long strip;

S2, then place the glass in a heating furnace for heating under vacuum conditions and a vacuum degree of ≤2.5MPa, and heat the automotive glass with a thickness of S millimeters flat to a maximum radius of curvature of 850 millimeters; among them, S is a natural number, and the preheating temperature is 170℃;

S3, the automobile glass is heated continuously, the final heating temperature is constant at 685°C, and the total heating time is T=S×35 seconds;

S4, the heated glass is sent into a cooling box, the inside of the cooling box is injected with inert gas nitrogen, the flow rate of the input nitrogen is kept at 200ml/min, the temperature is uniformly maintained, and then sent into the processing glass mold.

In step S1, the water jet cutting method is used for cutting, the pressure of the water jet cutting jet on the glass is set to 280N, the power is less than 52KW, and the diameter of the cutting jet head is set to 0.35mm.

In step S2, during the preheating process, the temperature is slowly increased in an increment of 5°C per minute, and then kept at 170°C for 15 minutes.

In step S3, during the heating process, the first temperature range is 0-145°C, the second temperature range is 145-280°C, and the third temperature range is 280-685°C. During the heating process, the first temperature is maintained. The heating rate of the first temperature section is increased at 10°C per minute, the temperature rise rate of the second temperature section is increased by 15°C per minute, and the temperature rise rate of the third temperature section is increased by 18°C per minute.

In step S4, in the cooling box, the cooling water machine can be used to cooperate with the cooling, and the cooling water machine can slowly cool down in a manner of decreasing 6-8 °C per minute, and then keep the temperature range at 10-20 °C, while in the cooling box. , can be equipped with a sprayer and a humidity sensor to maintain and control the relative humidity of the cooling room.

In step S4, can also adopt the rapid injection of liquid nitrogen to carry out the rapid cooling, and can cooperate with the fan to simultaneously reduce the temperature.

The thickness of the processed glass is between 3-12 mm.

It also includes suspending or placing the glass vertically during heating and cooling.

Example 1

First prepare a 10mm glass sheet, wash it, and cut it into strips with a water jet; then under vacuum conditions, under the condition of a vacuum degree of 1.8MPa, place the glass in a heating furnace to heat, and heat the automotive glass with a thickness of 10mm. Heating at high temperature by laying flat to the maximum radius of curvature of 850 mm; preheating the heating temperature to 170 °C, heating the automotive glass continuously, heating the glass at a constant temperature of 685 °C for 350 seconds; sending the heated glass to the cooling box In the cooling box, the inert gas nitrogen is injected into the inside of the cooling box, and the cooling water machine is used to cooperate with the cooling. The flow rate of input nitrogen was controlled at 200ml/min, the temperature was kept uniformly, and finally sent to the processing glass mold.

The specific parameter table is as follows

Embodiment 2

First prepare a 6mm glass sheet, clean it, and cut it into long strips with a water jet; then under vacuum conditions and a vacuum degree of 1.8MPa, place the glass in a heating furnace for heating, and heat the automotive glass with a thickness of 10mm. Heating to a maximum radius of curvature of 850 mm; preheating the heating temperature to °C, and heating the automotive glass continuously at a constant temperature of 685 °C for 210 seconds; sending the heated glass into a cooling box , The inert gas nitrogen is injected into the cooling box, and the cooling water machine is used to cooperate with the cooling. The cooling water machine maintains a decreasing mode of 6-8 °C per minute to slowly cool down, and then maintains the temperature range at 20 °C. At the same time, in the cooling box, keep the input The flow rate of nitrogen was controlled at 200ml/min, the temperature was kept uniformly, and finally sent to the processing glass mold.

The specific parameter table is as follows

To sum up, in the heat treatment process of the present invention, the processed glass is reheated, cut by water jet, and gradually heated in layers, and at the same time can be rapidly cooled by nitrogen or cold air, and the whole heating and cooling process adopts suspension. Hanging or placing it vertically to ensure the curvature of the glass, the method is simple, and the processed products are of high quality and long service life.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above, and it will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but without departing from the spirit or essential aspects of the present invention. In the case of the characteristic features, the present invention can be implemented in other specific forms. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the appended claims. All changes within the meaning and range of the equivalents of , are included in the present invention.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. a thermoforming process for automobile glass processing, it is characterized in that: comprise following production process, S1, prepare glass sheet, clean it, and cut into long strips; S2, then place the glass in a heating furnace for heating under vacuum conditions and a vacuum degree of ≤2.5MPa, and heat the automotive glass with a thickness of S millimeters flat to a maximum radius of curvature of 850 millimeters; among them, S is a natural number, and the preheating temperature is 170℃; S3, the automobile glass is heated continuously, the final heating temperature is constant at 685°C, and the total heating time is T=S×35 seconds; S4, the heated glass is sent into the cooling box, the inert gas nitrogen is injected into the cooling box, the flow rate of the input nitrogen is kept at 200ml/min, the temperature is kept uniform, and then sent into the processing glass mold. 2. A kind of thermoforming process of automobile glass processing according to claim 1, is characterized in that, in step S1, cutting uses water-jet cutting method, and described water-jet cutting jet pressure on glass is set as 280N, and power is 280N. Less than 52KW, the diameter of the cutting jet head is set to 0.35mm. 3. The thermoforming process for automotive glass processing according to claim 1, characterized in that, in step S2, in the preheating process, the temperature is slowly increased in an incremental manner of 5°C per minute, and then kept at 170°C for a continuous period of time. 15min. 4. The thermoforming process for automotive glass processing according to claim 1, wherein in step S3, in the process of heating, the first temperature section is at 0-145°C, and the second temperature section is at 145°C. -280°C, the third temperature segment is at 280-685°C, during the heating process, keep the heating rate of the first temperature segment increasing at 10°C per minute, the second temperature segment increasing at 15°C per minute, and the third temperature segment heating up Speed 18°C increments per minute. 5. A kind of thermoforming process for automotive glass processing according to claim 1, characterized in that, in step S4, in the cooling box, the cooling water machine can be used for coordinated cooling, and the cooling water machine keeps 6-8 per minute The temperature is gradually lowered in a decreasing manner, and then the temperature range is kept at 10-20°C. At the same time, a sprayer and a humidity sensor can be added in the cooling box to maintain the relative humidity in the cooling room. 6 . The thermoforming process for automotive glass processing according to claim 1 , wherein, in step S4 , rapid injection of liquid nitrogen can also be used for rapid cooling, and the cooling can be performed simultaneously with a fan. 7 . 7 . The thermoforming process for automotive glass processing according to claim 1 , wherein the thickness of the processed glass is between 3-12 mm. 8 . 8 . The thermoforming process for automotive glass processing according to claim 1 , further comprising: suspending or vertically placing the glass during heating and cooling. 9 .