Rubber O-ring is a sealing ring with a circular cross-section made of rubber as the main raw material. It is mainly used for static and reciprocating sealing of hydraulic and pneumatic systems in various types of machinery. It has a simple structure, small volume, Easy to disassemble and assemble, good sealing effect. When using recycled rubber to produce rubber O-rings, the structure, size, accuracy, etc. of the mold directly affect the quality of the finished O-ring. So what are the commonly used molds? How to correctly choose the recycled rubber O-ring mold?
1. Commonly used single-hole model points and selection techniques for recycled rubber O-rings
Reclaimed rubber is used to produce static sealing products such as flange joints and cylinder gaskets, as well as dynamic seals such as reciprocating rods and rotating shafts. The mold parting part is selected according to the use occasion of the O-ring. Among them, the parting surface of the O-ring mold for static sealing using recycled rubber HYL8Y6YEE can be used at a 180° horizontal position; when used to produce O-ring seals with reciprocating and rotating motion, it is recommended to use a 45° parting surface. Let the glue flow edge avoid the sealing surface to ensure its sealing performance.
2. Points and selection techniques for commonly used cavity molds and multi-layer molds for recycled rubber O-rings
Many rubber O-ring molds will press two or more O-rings on one mold, with large rings surrounded by small rings or in a multi-layer arrangement to save mold materials, that is, cavity molds and multi-layer molds. It should be noted that due to the poor processing accuracy of the cavity mold, it is not recommended to use this type of mold when using recycled rubber to produce O-rings that require high precision.
3. Commonly used multi-cavity mold points and selection techniques for reclaimed rubber O-rings
Compared with single-hole molds, multi-cavity molds can press multiple products at the same time due to their multi-cavity form, significantly improving the vulcanization efficiency of reclaimed rubber O-rings. In actual production, both the 180° parting surface and the 45° parting surface can be designed into multi-cavity molds.
4. Characteristics and selection techniques of commonly used tear-off O-ring molds for recycled rubber O-rings
The glue flow groove and cavity of the tear-off O-ring mold are very close to each other, between 0.05-0.08mm. The glue flow groove is 90°, open in half, and has a small cross-sectional area. The overlap between the glue grooves of the multi-cavity tearing mold is 0.03-0.05mm. The glue edges can be integrated with each other for easy removal. When using recycled rubber to produce rubber O-rings, after the product is taken out of the mold cavity, the remaining rubber edge is easy to tear off, and no special trimming is required. In actual production, the O-ring mold with tear-off structure can also be divided into 180° and 45° parting surfaces.
When using reclaimed rubber to produce rubber O-rings, rubber product manufacturers must select appropriate molds based on the use occasions and structural characteristics of the sealing rings to provide a good foundation for vulcanization and molding.
