300 Ton Rubber Spare Parts Injection Molding Machine

1. 300 Ton Rubber Spare Parts Injection Molding Machine

Rubber Products Post-Vulcanization Treatment​:

After vulcanization, rubber products often need some post-processing to become qualified products. This includes: ①The edge trimming of rubber mold products to make the surface of the product smooth and the external dimensions meet the requirements; ②After some special processing, such as the surface treatment of the product, the performance of the product for special purposes is improved; ③ Products containing fabric skeletons, such as tapes, tires, etc., should be thermally stretched, cooled, vulcanized and then cooled under inflation pressure to ensure product size and shape stability and good performance.

Finishing of mold products after vulcanization: When rubber mold products are vulcanized, the rubber will flow out along the parting surface of the mold, forming overflow rubber edges, also called burrs or flash edges. The amount and thickness of the rubber edges depend on the structure, precision, and The parallelism of the plate of the plate vulcanizer and the amount of glue remaining. The products produced by the current endless molds have extremely thin rubber edges, and sometimes they are taken off when the mold is drawn or can be removed with a gentle rub. However, this kind of mold is costly and easily damaged, and most rubber molded products need to be trimmed after vulcanization.

• Rubber products are manually trimmed: Manual trimming is an ancient method of trimming, which includes manually punching the plastic edge with a punch; removing the plastic edge with scissors, scraping, etc. The quality and speed of the rubber products that are manually trimmed will also vary from person to person, requiring trimming.The geometric dimensions of the finished product must meet the requirements of the product drawing, and there must be no scratches, scratches or deformation. Before trimming, you must know the trimming parts and technical requirements, master the correct trimming method and use the correct tools.
• Rubber products mechanical trimming: Mechanical trimming refers to the process of trimming rubber mold products using various special machines and corresponding process methods. It is currently a more advanced trimming method.

1. (1) Mechanical punching and trimming are used to remove the rubber edge of the product by means of a press machine, a punching die and a punching knife. This method is suitable for products and model products whose rubber edges can be placed on the die or the bottom plate of the punching knife, such as bottle stoppers and leather bowls. For products with higher rubber content and low hardness, the impact method is generally used to cut the edges, so as to reduce the uneven edges and side depressions caused by the greater elasticity of the products; while the rubber content is lower and the hardness is higher. The products can be directly punched by knife-edge die method. In addition, punching is also divided into cold cutting and eager cutting. Cold cutting refers to punching at room temperature. It requires higher punching pressure and better quality of punching; eager cutting refers to higher temperature-f, When punching, it is necessary to prevent the high temperature from contacting the product for too long, which will affect the product quality.
2. (2) Mechanical cutting trimming is suitable for trimming products with larger external dimensions, using cutting tools. Yifang cutting machines are dedicated machines, and different products use different cutters. For example, after the tire is vulcanized, there are rubber strips of different lengths on the surface of the air hole and the exhaust line, and the rubber strip must be removed with a grooved tool under the condition of the tire rotation.
3. (3) Mechanical grinding and trimming For mold rubber products with inner holes and outer circles, the grinding method is usually used. The cutting tool for grinding is a grinding wheel with a certain thickness of particles, and the precision of grinding and trimming is low, and the grinding surface is rough. Residual sand particles may be trapped, which affects the use effect.
4. (4) Low-temperature shot blasting trimming For fine products that require high trimming quality, such as O-rings, small leather bowls, etc., this method can be used for trimming. The product is quickly cooled with liquid nitrogen or dry ice to below the brittle temperature, and then metal or plastic pellets are sprayed at high speed to break the flash off and finish trimming.
5. (5) Low-temperature brush grinding and trimming. It uses two nylon brushes rotating around a horizontal axis to remove the rubber edge brushes of frozen rubber products.
6. (6) Low-temperature drum trimming is the earliest method of freezing trimming. It uses the impact force generated by the rotation of the drum and the friction between the products to break and fall off the flash of the products that have been frozen below the brittle temperature. , The shape of the drum is generally octagonal to increase the impact force of the product in the drum. The rotation speed of the drum should be moderate. Adding abrasives can improve efficiency. For example, the trimming process of the rubber plug of electrolytic capacitor is to use low-temperature drum trimming.
7. (7) Low-temperature vibration trimming is also called vibration frozen trimming. The products are helically vibrated in a circular sealed box. There is a strong impact between the products and between the products and the abrasive, which causes the frozen brittle rubber edges to break drop. Low-temperature vibration trimming is better than low-temperature drum trimming, the product damage rate is low, and the production efficiency is higher.
8. (8) Low-temperature swing and jitter trimming is suitable for small or micro products or micro rubber products containing metal skeletons. It can be used with abrasives to trim the holes, corners, and grooves of the product.

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