Rubber Products Use Performance Has Improved
Rubber Products in the vulcanization is often completed after the need for some post-processing, in order to become qualified products. This includes:
① rubber mold products to the edge of the dressing, so that products smooth surface, the size to meet the requirements;
② after a number of special processing, such as the surface of the product for processing, so that the use of special-purpose products have improved performance;
③ products containing fabric skeleton, such as tape, tires and other products to be hot-drawn cooling and curing in the inflation pressure after cooling to ensure that the product size, shape and stability of the use of good performance.
First, the mold after curing the dressing
Rubber mold products in the vulcanization, the rubber material will extend the mold part of the surface and other parts of the flow out, the formation of overflow plastic edge, also known as the burr or flash, the number of glue and thickness depends on the mold structure, Flatness of flat plate vulcanizing machine flat plate and the amount of adhesive glue. Now the production of endless mold products, rubber is particularly thin, sometimes from the mold when it was brought away or gently rub can be removed. But this mold cost is high, easy to damage, most of the rubber molded products in the vulcanization after the need for dressing treatment.
Handmade trimming is an ancient trimming method, which includes hand punching with a punch; with scissors, scraper and other tools to remove the glue side. The quality and speed of the rubber products are also subject to change. The geometrical dimensions of the finished product must be in accordance with the requirements of the product drawing, and shall not be scratched, scratched and deformed. Before the dressing must be clear the repair parts and technical requirements, to master the correct method of dressing and the correct use of tools.
2. Mechanical finishing
(1) mechanical punching trimming with pressure machinery and die, punching knife, remove the product of the plastic edge. This method applies to the product and its plastic side can be placed on the die or punching the floor of the model products, such as corks, cups and so on. For the high rate of plastic, the hardness of small products generally use the impact method of impact cutting edge, so that can be reduced due to the larger elastic products caused by the edge of the knife after the uneven, side depression; and low rate of plastic, high hardness Of the products, you can directly take the knife die method of punching. In addition, the punching is also divided into cold cut and eagerly, cold cut is at room temperature posture punching, requiring the device punching pressure is higher, punching the quality is better; eagerly at a higher temperature, Should prevent high temperature contact products for too long, affecting product quality.
(2) mechanical cutting trimming for larger dimensions of the trimming products, the use of cutting tools. A cutting machine is a special machine, different products using different cutter. For example, after the tire vulcanization surface gas and exhaust line parts of the length of the strip, must be used in tire rotation conditions with a groove with the tape to remove.
(3) Mechanical Grinding Trimming For molded rubber products with bore and outer circumference, grinds are usually used. Grinding the cutting tool for the grain of a certain thickness of the grinding wheel, grinding the edge of the lower precision, grinding the surface may be more coarse sand residual sand, affecting the use of results.
(4) low temperature shot blasting trim for the trimming quality requirements of the fine fine products, such as 0-ring, small bowl, etc., can be used to repair this method. The product will be liquid nitrogen or dry ice quickly cooled to below the brittle temperature, and then high-speed sprayed metal projectile or plastic projectile will flash off the cut off, complete trimming.
(5) low temperature brushing trim it is with two horizontal rotation around the horizontal axis of the nylon brush will be frozen rubber products to remove the edge of the brush.
(6) low-temperature drum trimming it is the earliest use of the frozen trimming method, the use of drum rotation caused by the impact force and the friction between products, so that has been frozen to brittle temperature of the product below the break and fall off , The shape of the drum is generally octagonal, in order to increase the impact of the product in the drum, the drum speed to moderate, adding the abrasive can improve efficiency. Such as the electrolytic capacitor rubber stopper of the trimming process is the use of low temperature drum dressing.
(7) low temperature vibration trimming, also known as vibration frozen trimming, products in the ring seal box to do helical vibration, between products and products and abrasive there is a strong impact between the impact, resulting in frozen brittle plastic drop. Low temperature vibration trimming than low temperature drum trim, good product damage rate, higher production efficiency.
(8) low temperature swing, jitter trimming on the small or micro-products or metal skeleton containing micro-rubber products, with the abrasive to repair the product hole, corners, groove in the plastic edge.