What is the provincial model?

Realize why the mold surface should be polished. With the increasing use of plastic products and higher quality requirements, the quality of the mold surface is often required to reach the level of mirror polishing. The mold with smooth surface and no mold loss has the following advantages: 1 When molding plastic products, the products are easy to demould. 2. It can reduce the corrosion of plastic materials to molds. 3. It can reduce the mold fracture or explosion caused by excessive temporary load or fatigue. How to judge the surface quality of the mold should pay attention to the following two points: 1 The surface of the mold must have a geometrically correct plane. However, there are no long undulations on the surface. These ups and downs and the shortcomings left by the high round trip of the mold when grinding with a grinding wheel in the past. The mirror polished surface of a mold is usually judged by the naked eye, but it is often difficult to judge by the naked eye, because a surface judged to be smooth by the naked eye may not really be considered to be completely smooth in geometry. The surface of the mold must be completely free of scratches, such as small holes left by pulling out carbonized particles. Local peeling, etc. If the quality of the mould is strict, the smoothness of its surface can be measured by special instruments, which depends on the method of light wave refraction or the use of magnifying glass. Tools and mechanical tools for polishing modules: sandpaper, whetstone, wool wheel, diamond plaster, diamond table file, flint, diamond grinding needle, various copper sheets, various bamboo sheets, fiber whetstone and circular grinder. Specification for tools and similar sandpaper: 650. 180 #, 240 #, 320#, 400#, 600#, 800 #,1000 #,1200 #,1500 #. Gold sandpaper: 0 #. Wool wheel: cylindrical, conical, square-pointed. Diamond sticker:1# 3 # 6 # 9 #15 # 25 # 35 # 60 # Color: white, yellow, orange, green, blue, brown, red and purple. Curved files and other shapes. Diamond grinding needle: generally 3/32 "handle and 1/8" handle, with round wave shape, cylinder shape, long straight cylinder shape and long cone shape. Copper sheet: 1/8 ",1/4" handle is flattened to save deep bone or plane, which is used for pasting sandpaper. Achieve the smoothness required by customers. Fiber whetstone: 400# color: blue to save mold identification 1. When the new module is processed, it should be cleaned with hot water (kerosene) first, and then all oil stains and unnecessary things should be wiped off with alcohol, so that when the mold is polished, the surface of the oilstone will not stick with dirt and lose its cutting function. 2. When saving the mold, it should be cleaned first. In bone pits and dead corners, the protruding position and large plane are omitted. 3. Some modules are embedded in three or four blocks, and only thick lines or live wires are cut along the edge of a single die. After all modules are closed, the closing position of plastic parts will be slightly smooth when brewing. 4. For the module with larger plane or higher protruding position, be sure to use flat steel sheet and red lead to check whether the module is uneven or uneven after coarse grain removal. If there is an uneven finished product, it will stick to the mold or drag the flowers. 5. If the module is flat, it may be a sealed position somewhere. We can stick sandpaper on the edge of the module that we don't want to store to ensure that there is no place. 6. Press sandpaper with copper or bamboo to save the mold. Remember that the sandpaper should not be larger than the tool area, so as not to hit the mouth with extra sandpaper to make it round or uneven. 7. When processing tools with copper or bamboo, the shape of the tool should be similar to that of the mold to avoid deformation of the module. For example, flat bamboo should be used for planing and small bamboo or round bamboo should be used for processing. 5438+03. Sandpaper or oilstone should be punched at an angle of 15 to 30 degrees, so as not to cause a deep pit beside the protruding position. 14. For example, when coarse-grained oilstones are in 150#, 180#, 220# and other oilstones, do not add water, except for polishing above 320#. Mold protectors should look at the fire lines clearly or find them in different ways. Because the pattern is found after each die test, it will take a lot of man-hours and waste to disassemble the module and try again. 16. To check the fire lines of the module, first clean the module, and then evenly apply copper acid on the surface of the module with a broom. After about 3~5 minutes, rinse the module with water and dry it with an air gun. Testing. Shiny spots with fire lines will appear on the surface. Repeated treatment with oilstone or sandpaper until it turns completely black after copper acid test. (The amount of cupric acid is 3.5 parts of water, cupric acid 1 part) 17. Saving rough copper is not more serious than saving young copper, just omit the protruding things or protruding parts on the copper surface, and the recessed parts are not necessarily smooth. It is best to find out the problems before saving the mold. Save all the prominent corners, be clear and obedient, and find out the reasons for the depression, not necessarily straight. If the copper pin is placed on the bronze fixture of the spark machine, the following four benchmark nails must be placed on the bottom with soft objects (such as cloth and paper cover) to avoid unnecessary damage when the workpiece moves, and it is the same when placed on a table or frame. Before cutting, use sandpaper to rub against each other to remove the slightly coarse sand particles on the sandpaper, which will reduce the sudden coarse particles during polishing. 20. The mold protector should report to the supervisor when he finds any abnormality or the saved module is turned over, and notify the supervisor when he finds an unknown object hitting the pattern. In addition, the mold protector should not hand it over before it is completed, and it will be discovered after the mold test, which will cause waste and accidents. The supervisor should also be informed10.00000000105 after the carbon crystal die saver is completed. According to the roughness of the surface, the coarse particles should be omitted from 400# sandpaper first, and then transferred to 600#, 800# and 1000#. When there is no grain, it can be polished with gold sandpaper, but it should be preserved with diamond paste, and finally polished with dry static cloth until the surface is smooth. The construction procedure shows that how a die saver decides the process of die saving and polishing depends on his experience and tools. The specific grinding and polishing procedures are as follows: milling, turning, EDM, whetstone polishing, and the granularity number is 46 (coarse) 80 120. 180 Sandpaper Polishing 220 (young) Sand Particle Number P240 (coarse) Diamond Gypsum Polishing P280 Diamond Particle Number P320 Quantity 45μm (coarse) P360 P400 25 P500 Mirror Discharge Machining 4. 5 μ m p600p800p100015p1200 (young) 9 8 0.8 μ m 6 3 1 μ m mirror discharge machining (young).

Requirements for finished products: mirror polishing 1. Steel: internal mold insert S 136 stainless steel hardness 52-54HRC2. Quenching method: (1) Only vacuum heat treatment can be used. Do not use traditional heat treatment methods. (ii) When it hardens, indicate it on the heat treatment notice: A.S 136b. Hardness 52-54 HRC. High temperature quenching plus two low temperature tempering 3. Processing method 3. 1 rough the glue position first. Leave 0.5mm on one side for finishing and quenching. 3.2 Etch the glue position with EDM (etching should be slightly uniform). 3.3 Use #600 sandpaper to polish, and then use # 1000 sandpaper to polish. 3.4 Polish with diamond paste. Use #6 first, and then use #3 to finish hot water cleaning. 3.5 If a hole is found, use it. Example of diamond paste polishing: diamond paste is the most common abrasive in polishing process. The best effect can be obtained by selecting suitable diamond gypsum and suitable grinding rod. Hand-held polishing tools include wooden sticks, needle sticks and flat sticks. Power tools include spherical and wiping rotary rods. Materials include metals with different hardness, wood, man-made fibers and even soft blankets. The hardness of grinding rod can directly affect the exposure of diamond particles. Thus affecting the polishing effect and speed. Polishing is a time-consuming and expensive process, but the cost can be reduced by adopting appropriate rules. Anyway, it must be kept clean. Polishing must be done in a clean and dust-free room. Because dust particles with high hardness may grind and damage the surface of the die to be finished, each polishing rod can only be used for each grade of diamond paste and must be kept in a dust-proof and sealed container. Hands and molds must be thoroughly cleaned. Only in this way can you choose a younger grade of diamond paste. The less the amount of diamond paste, the less thinner is used. The pressure applied during polishing depends on the hardness of polishing rod and the roughness of diamond gypsum. For the youngest No.3 and 1 diamond pastes, the applied pressure is only the weight of the polished rod. If you need faster grinding speed, you can choose harder tools and thicker diamond paste. When polishing begins, throw the corner first. Edges and pits. Be careful with sharp corners and edges, and use hard tools to avoid obtuse angles and round edges. Hard tools should be used. How to solve the difficulties in polishing process? The biggest problem encountered during polishing is: 1. Over-polishing: the real meaning of this word is: the more you throw it, the worse it gets. This phenomenon can be divided into two types. One is the appearance of "orange peel" surface. The second is "micro-pit". These two "over-polishing" phenomena mostly occur when mechanical polishing is used, but rarely when manual polishing is used. 2. "Orange peel" mostly occurs when the mold is kept, processed and ground for too long, and the carburization is excessive and the pressure is too high. Because harder steel can accept greater grinding pressure, steel with low hardness is easy to be "over-polished". If it is found that the mold polishing is not ideal, the main reasons for forming "micro-pits" are: excessive force or too long polishing time. Slight pressure will smooth out the protruding particles, but excessive force will grind away the soft parts of steel, expose the whole particles, and leave a pit after digging out. Remedial measures: re-grinding with grinding wheel, and grinding the die surface with coarse sand in the last process. Then use a younger grinding wheel to grind and re-polish. The polishing tool is too small. Especially when polishing with 10 diamond paste and smaller size, it is easier to form. We should use a harder polished rod, apply a lighter pressure and finish it in a short time. Polishing is a special process, easy to learn but difficult to refine, but as long as the methods and tools are correct, it can still reach the professional level. In order to improve production efficiency, we should learn advanced polishing knowledge and technology from abroad. Meet international standards. For example, using a circular mill and manual operation respectively. According to the shape, plane and facet of the module, the non-uniformity is non-uniform. Module size 100x 150x3/4 "deep, four bottom corners 1/8"R, four corners 1/4 "R Polishing requirements: #1s.p.i. See Hard 48HRC~52HRC modules. Connect 150#EDM oilstone with the front and rear ends. After that, drive the machine to a large plane until there are no fire lines, turn it to 320 oilstone and repeat it, or use 180# sandpaper to drive it with flat shoes until there are no 150# oilstone lines, turn it to 45o or 90o in the front direction with 320 sandpaper until there are no coarse lines and only 320# sand marks, then turn it to 400# sandpaper and then turn it to 45o or 900. 1000 #, 1200 #, 0 #, 2/0, 3/0, 4/0 gold sandpaper until there is no grain at all. Make sure that all edges, fillets and large planes are free of lines. Start polishing with diamond paste. First, clean the module repeatedly with hot water and alcohol. 8? 2 1 "large and loose felt roller is used to punch a large plane with its end face, and the felt roller is used to punch the module. 8? Felt rollers with a diameter of 23/8 "should surround the four corners of R 1/4", and felt rollers with a diameter of 1/4 "should surround the bottom. If there are not too many sanding marks left in the module, don't polish it for too long, and the module will produce orange peel or tiny pinholes. It's best not to drop too little diamond paste to form a thin desert on the surface, and don't hit the module directly with too many felt rollers. Before starting the mill, use felt roller to evenly coat diamond gypsum. Pay attention to the slow speed, and you can polish it with a little pressure. If the diamond paste is knotted, just dilute a little diamond paste with diamond oil. If too much diamond oil will fly away the diamond paste, the felt roller will have the opportunity to directly grind the module to produce orange peel lines and small pinholes. When finished, gently wipe a small part with a clean paper towel or cotton grain to see if there are any sanding marks. If there are no particles, clean the module with paper and hot water. 6#, 9# diamond paste, repeat the above operations, and finally use 1# diamond paste to gently rub the module until it is bright, and the module is completed. Place the module in a safe place and cover it with paper scraps or cloth scraps to ensure that nothing falls and damages the machined surface of the module. Time: rough polishing-depending on the size of the module, it should generally be in. Polishing in Yang Province-It takes about 24 hours for children to polish 4/0 gold sandpaper; Diamond paste throwing-the whole throwing process of diamond paste is about 1.5 hours; The total time is 45.5 hours. Example 3: Dimensions of module polished parts: 2 "x2" x 1/8 "deep four-sided sharp corner machining surface: H 13 heat treatment spark machine machining is similar to example1,but the four corners and the position of the machine body should be punched first, and then the plane should be punched. This module is best to use front and rear sliders and square felt rollers. Lighting in young provinces-about 8 hours; Diamond paste throwing-about 1 hour; The total time is 15 hours.