1. The foam body of a cycling helmet is formed through a foam mold. During the production of foam bodies, multiple sets of foam molds are usually installed side by side in the same vacuum box. The foam molds are equipped with air holes. By vacuuming the vacuum box, negative pressure can be formed inside each foam mold, and the foam material can be sucked into the foam mold. High temperature steam is then introduced into the vacuum box to heat the foam material, which expands, compresses, and combines to form a foam body. Cold water is then introduced to cool and shape the foam body. Finally, the foam mold is opened and the foam body is taken out.
2. Due to the need for various ventilation holes, fasteners, skeletons, and inserts (such as honeycomb mesh panels) on the foam body of cycling helmets, a large number of inserts need to be set up in their foam molds for forming or embedding these structures; Due to the hemispherical shaped irregular structure of the foam body, during the production process of the foam body, the convex and concave molds of the foam mold, as well as various inserts, need to be manually installed and disassembled repeatedly; On the one hand, due to the large number and scattered distribution of inserts, it is necessary to assemble all the foam molds before foaming production, and then move them into the vacuum box for installation and fixation. After foaming is completed, the foam molds need to be removed as a whole to remove the foam body. The labor intensity of the production process is particularly high, and workers need to operate for a long time in the narrow internal space after the machine is opened, which poses safety hazards and is easy to damage the inserts; On the other hand, a large number of inserts are assembled and transported within the convex and concave molds. Due to the inability to see the inside of the foam mold, some inserts are not easily noticeable when they are loose or displaced, resulting in poor foam formed.