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Mould polishing must pay attention to the basic knowledge

How to improve the quality of the product directly affects the quality of the product is an important task in the process of the development of industrial products to diversification. In the process of mould manufacturing, the smooth machining and the mirror surface machining are called the surface grinding and polishing, which is an important process to improve the quality of the mold. Master reasonable polishing method, can improve the quality and service life of the mold, and then improve the quality of products.
A common polishing method and working principle
1 mechanical polishing
Mechanical polishing by cutting or surface plastic deformation and remove protruding workpiece surface smooth surface polishing method of general use, oilstone, wool wheel, sand paper, mainly manual, high surface quality can be used for ultra precision polishing. The ultra precision polishing is a special abrasive tool, which is used to make the high speed rotating movement in the process of grinding and polishing with the abrasive. Using this technique, the surface roughness of ra0.008 m is achieved, which is the best of all kinds of polishing method. This method is often used in optical lens die. Mechanical polishing is the main method of die polishing.
2 Chemical Polishing
Chemical polishing is the material in the chemical medium to make the surface of the convex part of the concave part of the first dissolved, so as to get smooth surface. The method can be used to polish the workpiece with complex shape and can be polished with a lot of work pieces at the same time. The surface roughness obtained by chemical polishing is generally RA10 M.
3 electrolytic polishing
The basic principle of electrolytic polishing and chemical polishing the same, that is, by selective dissolution of the material surface micro convex part, so that smooth surface. Compared with chemical polishing, it can eliminate the influence of the cathode reaction, the effect is good.
4 ultrasonic polishing
Ultrasonic polishing is a kind of processing method of the ultrasonic vibration of the tool section, and the hard material is polished by the abrasive suspension. Put the workpiece in the abrasive suspension and put it in the ultrasonic field, and depend on the vibration of ultrasonic, so that the abrasive in the workpiece surface grinding and polishing. The ultrasonic machining is small, will not cause the distortion of the workpiece, but it is difficult to manufacture and install.
5 fluid polishing
Fluid polishing is to rely on the flow of liquid and its carrying abrasive particles to achieve the purpose of polishing the surface of the workpiece surface. Fluid power is driven by hydraulic pressure, the medium is mainly used in the low pressure flow of a good special compound (polymer material) and the incorporation of abrasive, abrasive can be made of silicon carbide powder.
6 magnetic abrasive polishing
Magnetic abrasive polishing is the use of magnetic abrasive in the field of the formation of abrasive brush, the workpiece grinding process. This method has high efficiency, good quality and easy control. The surface roughness can be reached to ra0.1 m by using suitable abrasive.
7 ultrasonic polishing
In order to improve the polishing speed of the workpiece with 1.6 RA above the surface roughness, the ultrasonic wave and the special high frequency pulse power supply of high frequency and narrow pulse power supply are combined to make a composite polishing, which is made by ultrasonic vibration and electric pulse. The surface roughness of the workpiece is rapidly reduced, which is very effective for the machining of the die rough surface of the workpiece, such as car, milling, EDM, wire cutting and so on.
Two common tools and specifications for mold polishing
Mold polishing tools commonly used are: sandpaper, stone, felt wheel, grinding paste, alloy file, diamond grinding, bamboo fiber oilstone, circular rotating grinding machine.
150#, 180#, sandpaper: 320#, 400#, 600#, 800#, 1000#, 1200#, 1500#;
120#, 220#, 400#: stone, 600#;
Tapetum round: cylindrical, Shiigata circle, square beak;
Grinding paste: 1# (white) 3# (yellow) 6# (Orange) 9# (green) 15# (blue) 25# () 35# (red) 60# (purple);
File: square, round, flat, triangular and other shapes;
Diamond grinding: usually 3/32 or 1/8 handle handle, a circular wave, cylindrical, long straight cylindrical, oblong shaped vertebrae;
Bamboo: all kinds of shapes for the operator and shape of the mold made, is pressing the sandpaper, grinding on the workpiece, achieve the desired surface roughness;
Fiber stone: 200# (black) 400# (blue) 600# (white) 800# (red)
Three polishing process
1 rough throw
The surface can be selected at 35000 ~ 40000r/min of the rotating surface of the rotating surface of the rotary surface of the grinding machine, electric spark machining, EDM, grinding and so on. Then the manual oilstone grinding, strip stone plus kerosene as lubricants or coolants. The use of the order of 180# - > 240# > 320# > 400# > 600# > 800# > > 1000#.
2 semi precision cast
Semi fine polishing mainly use sandpaper and kerosene. The number of paper are as follows: 400# - 600# - 800# - 1000# - 1200# - 1500#. In fact, only suitable for #1500 sandpaper hardened die steel (above 52hrc), and is not suitable for pre hardened steel, as this may cause damage to the surface of pre hardened steel, can not achieve the desired effect of polishing.
3 concentrate
Diamond grinding paste mainly used. If the diamond grinding polishing cloth mixed powder or paste for grinding, grinding sequence usually is 9 m (1800#), 6 m (3000#), 3 m (8000#). 9 m diamond grinding paste and polishing cloth can be used to remove hair worn 1200# and 1500# sandpaper left. Then the polishing paste is made with a stick felt and diamond grinding paste. The order is 1 m (14000#) > 1/2 m (60000#) > 1/4 m (100000#).
Four polished working environment
The polishing process should be completed in two work sites, which separate the coarse grinding and fine polishing place place, but also to pay attention to clean a process residue on the surface of the workpiece and the sand.
From the general use oilstone to 1200# sandpaper after rough polishing, polishing workpiece to clean the rooms, to ensure that the air
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