Development of polishing wheel
With the increasing application of industrial textiles, the application of nonwoven composites is becoming more and more obvious.
Polishing and grinding wheel processing in industrial products, especially in light industry, mechanical products in the production process is an important process, polishing for aluminum, stainless steel plate and high quality products, for it plays a crucial role to improve the surface quality of products. At present, the polishing wheel is usually used in the polishing of the surface of the product. The emery is easy to fall off, sand is not uniform, resulting in problems of low production efficiency, high energy consumption, high labor intensity, poor sanitation and so on; at the same time every year to consume a large amount of cotton, and the surface quality of the products is poor, low precision.
Since the beginning of 50s, European and American, Japan and other developed countries have widely used non-woven cloth and synthetic resin composite grinding tool. The utility model has the advantages of high cutting efficiency, good surface treatment effect, long service life, less sand drop, and is suitable for the batch production process.
This paper introduces the production technology of the new polishing material, it has two kinds of processing methods: sand and sand.
Sticking sand process
With synthetic fiber as raw material, the nonwoven fabric production process, preparation of non-woven felt a certain thickness, high bulkiness, then the abrasive and adhesive spraying composite non-woven felt, after drying, grinding by adhesive, adhesion to fibers, forming a certain ability of polishing sand mat.
1 material requirements
General use of PA6 or PA66 short fiber, the size of 9 ~ 15D, length of 51 ~ 65mm, in order to achieve the effect of high fluffy, fiber selection of high volume curve is good. Generally 20 / more than the degree of curling, or spiral crimp fiber; at the same time, in order to make the adhesion of sand when there is a strong adhesion, fiber oil agent is not easy.
2 manufacturing process of non-woven felt
The technological process is as follows: the fiber open cotton - Carding - into a network - spray adhesives - drying room - the opposite spray adhesive - drying room - cut into a roll. One should note that: the machinery must increase the mechanical lapping mechanism disorder, or airlaid, spray adhesive gas viscosity and no gas viscosity, adhesive acrylic milk and acrylate and vinyl acetate copolymer emulsion.
3 specification for bonded sand
The non-woven felt for the skeleton, the above spraying composite of various fineness of silicon carbide (TL), corundum (GZ), ferric oxide (Fe2O3), such as bauxite abrasive, abrasive fineness in general 80-320 mesh, at the same time by spraying adhesive after curing the abrasive and solid fiber bonding, so that the product has the sand mat a grinding cutting ability.
(1) adhesive: this adhesive is different from that in the production of non-woven felt, the former is an emulsion binder, the latter is a solvent binder. In order to make strong adhesion between abrasive and fiber, and the heat generated during grinding, polishing wheel surface up to 150~180 DEG C, so the adhesive, in addition to a good adhesion ability, heat resistance must also have a higher, abroad using modified phenolic resin, epoxy resin and polyurethane Jiechen resin.
(2) sand sticking: it is usually done on the special finishing equipment. In order to ensure the uniformity of the abrasive on the product, the method of abrasive application is particularly important. The current widespread use of the structure of inspersion, with a hopper above the abrasive, the package has a discharging roller elastic needle cloth hopper arranged below the discharging roll, rotation, abrasive cloth evenly into the needle, the discharging roll is provided with a vibrator with a wire brush, put into the grinding vibration by stripping down clothing fall, non-woven felt on. Another method used to spray non-woven felt, but it is difficult to guarantee the uniformity of abrasive, abrasive also on nozzle wear, abrasive blasting or dusting, and then sprayed with adhesive to make solid abrasive and fiber bonding, finally forming grinding wheel practical value.