CN103538448B - A kind of manufacture method of windshield - Google Patents

Abstract

The invention relates to the manufacturing technology of the windshield, in particular to a manufacturing method of the windshield with light weight and high impact resistance. The invention adopts an integral injection molding process to manufacture the polycarbonate load-bearing layer with a bolt hole connection structure. The impact resistance level and manufacturing efficiency of the windshield are improved. The invention selects injection-molded polycarbonate as the load-bearing layer, and connects the windshield glass to the body frame by means of bolt connection, and the bolt connection holes on the polycarbonate and the load-bearing layer are integrally injection-molded. This kind of windshield is not only light in weight and high in impact resistance, but also simple in structure and reliable in connection, and its manufacturing efficiency is also greatly improved. The anti-collision level reaches 1.8Kg and the flying bird hits the load-bearing layer at 500Km/h without breaking or falling off. The impact of 1Kg aluminum bullet at 600Km/h does not penetrate the bearing layer. When the speed hits the windshield, the aluminum bullet does not penetrate the load-bearing layer, and no fragments fall off from the load-bearing layer.

Description

A method of manufacturing a windshield

technical field

The invention relates to the manufacturing technology of the windshield, in particular to a manufacturing method of the windshield with light weight and high impact resistance.

Background technique

As a part of the body, the windshield must not only be able to withstand structural loads and impacts in various states, but also provide the driver with a clear field of vision and good optical visual effects. Good and excellent performance. The Shanghai Maglev Operation Demonstration Line, which started trial operation on December 31, 2002, has a maximum running speed of 430Km/h, and a maximum debugging speed of 501Km. On December 2, 2003, Yamanashi Prefecture, Japan set a world record for a maglev train carrying passengers at a speed of 580Km per hour. With the rapid development of science and technology, the speed of trains will become faster and faster, which also brings great challenges to the manufacturing technology of windshield glass. On the one hand, the anti-collision level of the windshield needs to be higher and higher. For the front window glass of the maglev train with a maximum speed of 500Km/h, it is necessary to consider the impact of foreign objects at a relative speed of 600km/h. According to the standard UIC651 of the International Union of Railways, the 1kg standard aluminum bullet is used for the impact test at 600km/h, and the window is required not to be penetrated. On the other hand, the windshield is required to be as light as possible on the basis of satisfying the structural function. Existing train windshields are generally formed by laminating multiple layers of toughened glass, and are connected to the body frame by a clamping structure. Due to the high support rigidity of this connection method, when the impact load of the bird body acts on the support structure and continues to squeeze the frame forward, the frame clamping structure has a small rebound deformation and stress concentration occurs, thereby greatly reducing the windshield. The level of bird strike resistance of the glass is also not conducive to the weight reduction of the train.

Contents of the invention

The object of the present invention is to provide a method of manufacturing a windshield. The train windshield manufactured by the method is light in weight, high in impact resistance, simple in structure and reliable in connection with the frame of the vehicle body.

The present invention adopts the following technical schemes: (1) adopt the injection molding method to manufacture the load-bearing layer of the windshield; first, lay the polycarbonate pellets in the blast drying box, the thickness of the pellet layer is 10-15mm, Dry at 120°C for 4-8 hours; then, perform injection molding on polycarbonate, the melt temperature during injection molding is 250-350°C, the molding mold temperature is 50-120°C, the injection pressure is 50-150MPa, and the cooling time is 10-60s, the injection speed is 100-150mm/s, the holding pressure is 50-70MPa, the holding time is 10-60s, and the load-bearing layer of the windshield is prepared; (2) for the electrothermal chemically strengthened glass coated with ITO film Carry out cutting and edging; after cutting and edging, clean the 1.5-4mm thick electric heating chemically strengthened glass surface layer, 2-6mm thick polyurethane middle layer and injection-molded polycarbonate load-bearing layer, and then use absorbent cotton dipped in 95 % petroleum ether to wipe its surface, and dry it for later use; (3) place an intermediate layer between the load-bearing layer and the surface layer, place copper electrodes, temperature sensors and wires between the intermediate layer and the surface layer, and assemble it into a windshield glass original ; Then, put the original windshield glass into the autoclave, hold the pressure for 30-120min under the conditions of temperature 80-180°C and pressure 1-3MPa, and hot-press laminate it into the windshield glass.

The thickness of the windshield is not more than 22mm.

Mounting bolt holes are injection molded around the bearing layer at one time.

The inventive effect of the present invention is: the present invention adopts the integral injection molding process to manufacture the polycarbonate load-bearing layer with the bolt hole connection structure. The impact resistance level and manufacturing efficiency of the windshield are improved.

The invention selects injection-molded polycarbonate as the load-bearing layer, and connects the windshield glass to the body frame by means of bolt connection, and the bolt connection holes on the polycarbonate and the load-bearing layer are integrally injection-molded. This kind of windshield is not only light in weight and high in impact resistance, but also simple in structure and reliable in connection, and its manufacturing efficiency is also greatly improved. The anti-collision level reaches 1.8Kg and the flying bird hits the load-bearing layer at 500Km/h without breaking or falling off. The impact of 1Kg aluminum bullet at 600Km/h does not penetrate the bearing layer. When the speed hits the windshield, the aluminum bullet does not penetrate the load-bearing layer, and no fragments fall off from the load-bearing layer.

Description of drawings

Fig. 1 is a schematic side view of the windshield structure of the present invention;

Fig. 2 is a schematic plan view of the windshield structure of the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

(1) Manufacture the load-bearing layer 4 of the windshield by injection molding: firstly, lay the polycarbonate pellets in a blast drying oven, the thickness of the pellet layer is 10-15mm, and dry at 120°C for 4 ~8h; Then, polycarbonate is injection molded. During injection molding, the melt temperature is 250-350°C, the molding mold temperature is 50-120°C, the injection pressure is 50-150MPa, the cooling time is 10-60s, and the injection speed The pressure is 100-150mm/s, the holding pressure is 50-70MPa, and the holding time is 10-60s, and the load-bearing layer of the windshield is prepared. The mold for injection molding includes a first mold and a second mold matched with the first mold. After the injection molding is finished, the mold is opened to eject the product; (2) cutting and grinding the electrically heated chemically strengthened glass 1 coated with the ITO film 2 Edge: Ultrasonic cleaning of the 1.5-4mm thick electric heating chemically strengthened glass surface layer, 2-6mm thick polyurethane middle layer 3 and injection-molded polycarbonate load-bearing layer after cutting and edging, and then use absorbent cotton dipped in 95% Wipe its surface with petroleum ether, and dry it for later use; (3) place an intermediate layer between the load-bearing layer and the surface layer, place copper electrodes 5, temperature sensors 6 and wires between the intermediate layer and the surface layer, and assemble into a windshield glass original ; Then, put the original windshield glass into the autoclave, hold the pressure for 30-120min under the conditions of temperature 80-180°C and pressure 1-3MPa, and hot-press laminate it into the windshield glass. After the hot-press lamination, the excess polyurethane film is cut off along the edge of the surface glass, and the exposed intermediate layer and the edge of the electric heating chemically strengthened inorganic glass are evenly covered with a sealant.

Embodiment one

First put the PC pellets into the blast drying oven, the thickness of the pellet layer is 15mm, and dry at 120°C for 8 hours; then the polycarbonate load-bearing layer of the windshield is injection-molded, and the melt temperature is 290 during injection molding. ℃, the mold temperature is 100℃, the injection pressure is 80MPa, the cooling time is 20s, the injection speed is 110mm/s, the holding pressure is 65MPa, and the holding time is 30s. After cutting and edging, the 2.2mm thick electrically heated chemically strengthened inorganic glass surface layer, the 4mm thick polyurethane intermediate layer and the injection-molded polycarbonate bearing layer were ultrasonically cleaned, and then wiped with absorbent cotton dipped in 95% petroleum ether , dry for later use. Sandwich a 4mm thick polyurethane film between polycarbonate and electrically heated glass, place electrodes, temperature sensors and wires at the designated positions, and then put it in an autoclave at a temperature of 120°C and a pressure of 1.6MPa Keep the pressure for 90min. After the hot press lamination is completed, the windshield glass is tested for thickness and impact resistance. The test results are as follows:

Embodiment two

First put the PC pellets into the blast drying oven, the thickness of the pellet layer is 15mm, and dry at 120°C for 6 hours; then the polycarbonate load-bearing layer of the windshield is injection molded, and the melt temperature is 280 during injection molding. ℃, the mold temperature is 110℃, the injection pressure is 70MPa, the cooling time is 30s, the injection speed is 120mm/s, the holding pressure is 60MPa, and the holding time is 30s. After cutting and edging, the 2.2mm thick electrically heated chemically strengthened inorganic glass surface layer, the 4mm thick polyurethane intermediate layer and the injection-molded polycarbonate bearing layer were ultrasonically cleaned, and then wiped with absorbent cotton dipped in 95% petroleum ether , dry for later use. Sandwich a 4mm thick polyurethane film between polycarbonate and electrically heated glass, place electrodes, temperature sensors and wires at the designated positions, and then put it in an autoclave at a temperature of 120°C and a pressure of 1.6MPa Keep the pressure for 90min. After the hot press lamination is completed, the windshield glass is tested for thickness and impact resistance. The test results are as follows:

Claims (4)

1. a manufacture method for windshield, is characterized in that,

(1) injection molding forming method is adopted to produce the bearing layer of windshield: first, be laid in by polycarbonate pellet in air dry oven, pellet overlay thickness is 10 ~ 15mm, dry 4 ~ 8h at 120 DEG C; Then, injection mo(u)lding is carried out to polycarbonate, during injection mo(u)lding, melt temperature is 250-350 DEG C, forming mould temperature is 50-120 DEG C, and injection pressure is 50-150MPa, and hardening time is 10-60s, injection speed is 100-150mm/s, dwell pressure 50-70MPa, dwell time 10-60s, prepared the bearing layer of windshield;

(2) cutting edging is carried out to the electro heat chemically reinforced glass being coated with ito film; The polycarbonate bearing layer of the thick electro heat chemically reinforced glass surface layer of 1.5-4mm after cutting edging, the thick Polyurethane Interlayer of 2-6mm and injection mo(u)lding is carried out ultrasonic cleaning, uses absorbent cotton to dip in its surface of ligroin wiping of 95%, dry for standby afterwards;

(3) between bearing layer and surface layer, place interlayer, between interlayer and surface layer, place copper electrode, temperature sensor and wire, be assembled into windshield original paper; Then, windshield original paper being put into autoclave, is 80-180 DEG C in temperature, and pressure is pressurize 30-120min under the condition of 1-3MPa, and hot pressing is laminated is windshield.

2. the manufacture method of a kind of windshield as claimed in claim 1, is characterized in that, the thickness of described windshield is no more than 22mm.

3. the manufacture method of a kind of windshield as claimed in claim 1, is characterized in that, the surrounding single injection-molded of described bearing layer goes out hold-down bolt hole.

4. the manufacture method of a kind of windshield as claimed in claim 1, it is characterized in that, the preferred 250-300 DEG C of described melt temperature, the preferred 80-110 DEG C of mold temperature, the preferred 110-140MPa of injection pressure, the preferred 20-50s of hardening time, the preferred 120-140mm/s of injection speed, the preferred 60-70MPa of dwell pressure, dwell time preferred 30-50s.