The fit of two pieces of glass after simultaneous heat bending is inconsistent
Because when bending the glass at the same time, thin glass softens early and bends quickly, while thick glass requires more heat and bends slowly. If the thin glass is put at the bottom, during bending, the thin glass at the bottom will be separated from the thick glass at the top due to the fast bending, resulting in an inconsistent appearance of the assembly and poor fit. If the thick glass is placed at the bottom, during bending, the thick glass bends slowly, so the thin glass can be supported at the bottom to make the appearance of the upper and lower glasses consistent, ensuring the object’s integrity. Therefore. When two pieces of glass on the same mold are bent at the same time, the thick glass should be placed at the bottom.
The reasons and preventive measures for inconsistent fit after two pieces of glass on the same mold are bent at the same time are as follows
① The upper and lower pieces of glass are placed in the wrong position. For example, the thickness of the two pieces of glass is different, and the thick piece is mistakenly placed on the top, causing the upper piece to bend slowly and the lower piece to bend quickly. The way to prevent this is to place the pieces as required when loading, that is, the thin piece is on the top and the thick piece is on the bottom.
② When loading, the upper and lower glass pieces are too offset from each other, and they are not aligned after bending. Therefore, when loading, the upper and lower glass pieces should be aligned front and back, and the steps on both sides should be equal.
③ When the glass is bent, it is not bent properly, resulting in a part without mold support, which is easy to deform and inconsistent under the influence of temperature changes. Therefore, the degree of hot bending should be carefully controlled during hot bending, and the glass should be completely attached to the mold.
④ When the glass is loaded, it is offset from the mold, and the distance between the periphery of the glass and the mold frame is different. When hot bending, a part of the lower glass falls off. In addition, this phenomenon also occurs when it is bent too much. The prevention method is to align the mold when loading, and not bend too much during hot bending.
The reasons and preventive measures for inconsistent fit after two pieces of glass on the same mold are bent at the same time are as follows
① The upper and lower pieces of glass are placed in the wrong position. For example, the thickness of the two pieces of glass is different, and the thick piece is mistakenly placed on the top, causing the upper piece to bend slowly and the lower piece to bend quickly. The way to prevent this is to place the pieces as required when loading, that is, the thin piece is on the top and the thick piece is on the bottom.
② When loading, the upper and lower glass pieces are too offset from each other, and they are not aligned after bending. Therefore, when loading, the upper and lower glass pieces should be aligned front and back, and the steps on both sides should be equal.
③ When the glass is bent, it is not bent properly, resulting in a part without mold support, which is easy to deform and inconsistent under the influence of temperature changes. Therefore, the degree of hot bending should be carefully controlled during hot bending, and the glass should be completely attached to the mold.
④ When the glass is loaded, it is offset from the mold, and the distance between the periphery of the glass and the mold frame is different. When hot bending, a part of the lower glass falls off. In addition, this phenomenon also occurs when it is bent too much. The prevention method is to align the mold when loading, and not bend too much during hot bending.
