Tire molds are used to vulcanize molds for all types of tires. Tire mold classification 1: active mold, consisting of a pattern ring, a mold sleeve, and upper and lower side plates. The active mold distinguishes the conical surface guiding active mold and the inclined plane guiding active mold. 2: The two mold halves are composed of two parts, an upper mold and a lower mold.
The mold is an important tool used in the tire vulcanization process. The mold is inevitably contaminated by the rubber, compounding agent and the release agent used in the vulcanization process. The main pollutants are sulfides and inorganic oxides. Materials, silicone oil, carbon black, etc., repeated use will cause some pattern pollution dead zone. Therefore, it is necessary to clean the mold frequently to ensure the cleanliness of the surface to ensure the quality of the tire and the life of the mold. In view of this, the development of the tire mold cleaning technology has attracted the attention of the industry.
1. The traditional cleaning method of tire mold
1.1 mechanical cleaning method
Manual sanding or steel wire physical grinding and dry blasting can be used, and different combinations can be used for cleaning. Mechanical cleaning is a mature technology that is widely adopted by the tire industry. The method has the advantages of simple and easy operation, low requirements on equipment and tools, but also has insurmountable defects: mechanical damage to the mold and shortening of the life of the mold; sandblasting is easy to block the vent hole of the mold, and venting after blasting The work of the vents is very large. The mold must be disassembled, resulting in high labor intensity and long cleaning cycle.
2. New cleaning technology
2.1 laser cleaning technology
Laser cleaning technology is a new type of cleaning technology that has developed rapidly in the past 10 years. It has gradually replaced traditional cleaning processes in many fields with its own advantages.
The laser cleaning technology refers to the use of a high-energy laser beam to illuminate the surface of the workpiece, so that the surface of the dirt, rust or coating is instantaneously evaporated or peeled off, and the surface attachment or surface coating of the cleaning object is removed at a high speed, thereby achieving a clean process. It is a new technology based on the interaction between laser and matter. Unlike traditional mechanical cleaning, chemical cleaning and ultrasonic cleaning (wet cleaning), it does not require any CR Lixin organic solvent that destroys the ozone layer. It is a “green” cleaning technology with no pollution, no noise, no harm to the human body and the environment.
Laser cleaning, in terms of its mechanism for mold cleaning, uses a clean substrate (also called a precursor) and a surface attachment (soil) to have a very different absorption coefficient for a certain wavelength of laser energy. Most of the laser energy radiated to the surface is absorbed by the surface deposits, which is heated or vaporized and evaporated, or instantaneously expanded, and is driven by the vapor stream formed on the surface to separate from the surface of the object for cleaning purposes.
Specifically used for tire mold cleaning, the mold absorbs laser light of a specific wavelength, the energy is very small, and will not cause damage. The dirt on the surface of the mold (sulfide, inorganic oxide, silicone oil, carbon black, etc.) absorbs a large amount of energy and is instantly expanded. Vaporization evaporation, away from the mold surface, to achieve the effect of cleaning.