How to make hot bending mold？

The material used to make hot-bending molds is mainly steel. Depending on the material, the tools used include electric welding machines, cutting machines, pipe bending machines, etc. The pipe-bending machine bends the steel pipe into the required arc, and the mold can be welded after the arc is bent. The key to mold forming is that the arc must be on the same arc surface, the curved surface must be flat, the diagonals must be the same, and the four corners must be on the same plane. In this way, the bent glass can be flat and not easily deformed. If the general curvature of hot bending glass is 4-6mm glass, and the curvature of the forming is allowed to have a slight error, several pieces of glass can be placed in the same mold for hot bending. When hot bending, first put a layer of fiberglass cloth on the mold then put the glass, and sprinkle some talcum powder between each piece of glass for isolation.

The general arc mold is made of a positive arc, that is, a U-shape with high sides and low middle. This mold can be baked without external force and local heating to form glass, and the temperature is controlled at about 580℃. If the time control is reasonable, there will be no problem with the formed hot bending glass.

The production of deep-bending hot-bending molds is the same as that of general shallow-bending molds. However, some deep-bending glass products need external force or heating in local areas to achieve the required effect when hot bending. Deep-bending products generally only bend one piece per mold at a time. If it is necessary to hot bend two pieces in the same mold, you should be more careful. If the temperature is still slightly deviated, it is easy to cause the glass to burst and form poorly, especially for thick glass. To get an ideal product, you must have considerable product experience.

Deep-bending glass products are generally bent downward on both sides during hot bending, which is opposite to the production direction of shallow-bending glass. Especially for deep bending products close to 180° or more, reverse mold hot bending must be used.

The production of right-angle molds is very simple. Just use square tubes or angle irons to weld into a rectangular frame according to the size. However, special attention should be paid to the flatness and parallelism of the mold during welding. Positioning devices should be installed on both sides of the mold (i.e., the two sides of the glass bend) to prevent the glass from being too large when forming, not being a right-angle product, and being scrapped.

When making molds for hot-bending products with special shapes, special attention should be paid to the smoothness of the arc. Only when the mold and the template are completely consistent can qualified products be produced. There are many hot-bending products with special shapes. Some require external force and local heating to form, while others do not require external force. For some special hot-bending products, special hot-bending furnaces should be used to produce them, such as bullet-shaped, U-shaped, washbasin-shaped products.

Some small hot-bending lamps, watch glasses, fruit plates, etc., generally use stainless steel to make molds. During firing, isolation powder should also be sprayed for isolation to minimize pitting caused by excessive temperature.

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