Preheating device, preheating method, hot bending machine and machining method of high-efficiency 3D (Three-Dimensional) cover glass

Abstract

The invention discloses a preheating device, a preheating method, a hot bending machine and a machining method of high-efficiency 3D (Three-Dimensional) cover glass. The preheating device of the high-efficiency 3D cover glass at least comprises a second preheating workstation which adopts electromagnetic induction heating equipment to heat and a third preheating workstation which is located behindthe second preheating workstation and adopts resistance heating equipment to heat. In the scheme, preheating of a molding die is carried out by combining resistance heating with electromagnetic induction heating, so that the heating efficiency can be greatly accelerated; compared with independent resistance heating preheating, half preheating time can be reduced, the preheating time can be shortened to be 10 to 20 seconds, and the preheating speed is increased; compared with independent electromagnetic induction heating, temperature homogenization can be realized by the molding die and coverglass after temperature rising through the electromagnetic induction heating, and the damage to the cover plate during a pressing process due to non-uniform heating temperature can be avoided, so thatthe yield of a 3D cover glass finished product can be increased, and effective combination of efficiency improvement and yield improvement is realized.

Description

technical field [0001] The invention relates to the field of cover glass processing, in particular to a high-efficiency 3D cover glass preheating device, a preheating method, a hot bending machine and a processing method thereof. Background technique [0002] With the advent of the 5G signal era, the shortcomings of traditional metal shell shielding signals tend to be obvious. [0003] As a mobile phone casing, glass has many advantages such as novel appearance, comfortable feel, good plasticity, etc., and gradually replaces traditional plastic casings and metal casings. [0004] One of the latest innovations is to obtain a three-dimensional structural shape by bending the edge or center of the glass, that is, by applying pressure to the periphery of the cover glass while heating, so that the existing two-dimensional flat state of the cover glass is bent into a 3-dimensional shape. [0005] The existing heating methods used in the molding process of 3D mobile phone cover g...

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Problems solved by technology

[0006] The resistance rod heating forming process is to heat the forming mold through the resistance heating tube and indirectly heat the forming mold to soften the glass through heat conduction, but the resistance heating is slow, and the heat loss taken away by the forming mold after passing through each station takes a long time to complete. Temperature compensation, and the maximum temperature of the heating is limited

[0007] Electromagnetic induction heating uses electromagnetic induction to generate current inside the mold, and relies on eddy current energy to heat the forming mold. Its advantage is that the forming mold can reach the temperature of the glass softening point within a few seconds. The disadvantage is that due to the characteristics of electromagnetic, the forming mold is close to the coil. The side temperature is high, and the temperature far away from the coil is low, resulting in very poor thermal uniformity of the forming mold, resulting in poor thermal uniformity of the cover glass, resulting in a low yield of the final press-molded 3D cover glass

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