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What are the difficulties of injection processing shell
by：CSSSLD
2021-01-23
What are the difficulties of injection processing shell
the plastic injection molding processing products to occupy the whole plastic products - 30% of the market Around 40% of the share, its high efficiency, high quality molding methods are popular with many enterprises. And produced the plastic products precision is higher than that of the other methods to produce, and injection molding processing shell is an important branch of the injection molding processing products. The husk of many common items in our life are almost always made from all kinds of plastic, such as mobile phone shell, refrigerator shell, computer casings, such as air conditioning shell! Its are manufactured by processing injection molding method. Product shell is also a link consumers come into contact with the product first, regardless of product performance? How beautiful? Process how? If shell quality is not up to standard, will give a bad impression for the consumer, can directly about the product sales success, so each big manufacturer requirement is very strict about the quality of the product shell, so we in the casing injection molding processing production and what are the common process should pay attention to? Injection molding processing shell size tolerance, if the huge difference between the size and the size of the product itself, is the gap is very big, very easy for consumers to find, and the impression that the inferior products. Second: injection molding processing and roughness on the surface of the shell, when the consumer touch the shell, is bound to leave comfortable feel, smoothness and injection mold design and injection molding raw material has a lot to do. Third: injection molding processing shell paint are bound to uniform, eliminate odor also should timely. Fourth: injection molding processing and the strength of the shell is necessarily durable, such as general electric products at least with a decades of time, it is inevitable that the party during this period, so the injection molding processing shell be inevitable impact etc. As long as we are in the production of injection molding processing shell when he noted the process problems, it is easy to produce qualified products.
in the injection molding processing analysis of cracking
A, processing technology: 1, processing pressure, speed too fast, the more filling material, injection, the holding time is too long, can cause excessive internal stress and crack; 2, adjust the molding speed and pressure to prevent rapid control caused from cracking; 3, the injection pressure is too low or too fast injection; 4, prevent due to weld mark, plastic degradation caused by lower mechanical strength and fracture; 5, appropriate use of release agent, attention often eliminate surface adhesion of materials such as aerosol; 6, residual stress parts, can be in molding immediately after annealing heat treatment to eliminate internal stress and reduce the generation of crack; 7, without lubrication or lubrication but the effect not beautiful; 8, the appropriate high mold temperature, make the product easy to demould, appropriate to trim material temperature prevent decomposition; 9, the production of products, because the plastic in uneven cooling in the cavity and non-uniform shrinkage and product structural design is unreasonable, easy to cause various defects of the products; 10, plasticizing, namely molten melt not evenly all phase; B, the material quality: 1, the rebirth of material content is too high to cause low intensity of parts; 2, humidity, resulting in some plastic react with water, lower intensity and appear out cracking; 3, impurities in raw material or rebirth is expected to exceed bid; 4, raw material moisture content is too large; 5, the material itself is not appropriate processing environment or poor quality, the pollution will cause cracking. 6, raw material easy volatile matter beyond the standard; C, the mold precision: 1, the ejection to balance, sectional area should be enough, the draft should be enough, cavity surface are smooth enough, to prevent ejection residual stress concentration and cracking due to external force; 2, the structure of the parts can't be too thin, the transition part should adopt arc transition, avoid sharp corners, chamfering cause stress concentration; 3, as far as possible with a metal insert, in order to prevent the insert with different shrinkage internal stress caused by increasing parts; 4, molding process is not perfect, mainly displays in the convex and concave die forging billet internal quality is poor, there is something wrong with the heat treatment technology and process, cause the convex and concave die quenching, have a soft spot and uneven hardness; 5, to deep bottom parts should set appropriate demoulding intake channel, to prevent the formation of vacuum negative pressure; 6, the mainstream way enough ambassador gate before curing mold release, such easy to stripping; 7, the sprue bushing and the nozzle joint shall prevent cold hard material drag and make the parts stick on the fixed mould; 8, die structure is not reasonable. Thin punch without strengthening device design, discharging mouth not free a boundary discharge force had intensified ambassador punch under cyclic loading, etc. ; 9, mold temperature is too low, and poor liquidity of the melt.
the plastic injection molding processing products to occupy the whole plastic products - 30% of the market Around 40% of the share, its high efficiency, high quality molding methods are popular with many enterprises. And produced the plastic products precision is higher than that of the other methods to produce, and injection molding processing shell is an important branch of the injection molding processing products. The husk of many common items in our life are almost always made from all kinds of plastic, such as mobile phone shell, refrigerator shell, computer casings, such as air conditioning shell! Its are manufactured by processing injection molding method. Product shell is also a link consumers come into contact with the product first, regardless of product performance? How beautiful? Process how? If shell quality is not up to standard, will give a bad impression for the consumer, can directly about the product sales success, so each big manufacturer requirement is very strict about the quality of the product shell, so we in the casing injection molding processing production and what are the common process should pay attention to? Injection molding processing shell size tolerance, if the huge difference between the size and the size of the product itself, is the gap is very big, very easy for consumers to find, and the impression that the inferior products. Second: injection molding processing and roughness on the surface of the shell, when the consumer touch the shell, is bound to leave comfortable feel, smoothness and injection mold design and injection molding raw material has a lot to do. Third: injection molding processing shell paint are bound to uniform, eliminate odor also should timely. Fourth: injection molding processing and the strength of the shell is necessarily durable, such as general electric products at least with a decades of time, it is inevitable that the party during this period, so the injection molding processing shell be inevitable impact etc. As long as we are in the production of injection molding processing shell when he noted the process problems, it is easy to produce qualified products.
in the injection molding processing analysis of cracking
A, processing technology: 1, processing pressure, speed too fast, the more filling material, injection, the holding time is too long, can cause excessive internal stress and crack; 2, adjust the molding speed and pressure to prevent rapid control caused from cracking; 3, the injection pressure is too low or too fast injection; 4, prevent due to weld mark, plastic degradation caused by lower mechanical strength and fracture; 5, appropriate use of release agent, attention often eliminate surface adhesion of materials such as aerosol; 6, residual stress parts, can be in molding immediately after annealing heat treatment to eliminate internal stress and reduce the generation of crack; 7, without lubrication or lubrication but the effect not beautiful; 8, the appropriate high mold temperature, make the product easy to demould, appropriate to trim material temperature prevent decomposition; 9, the production of products, because the plastic in uneven cooling in the cavity and non-uniform shrinkage and product structural design is unreasonable, easy to cause various defects of the products; 10, plasticizing, namely molten melt not evenly all phase; B, the material quality: 1, the rebirth of material content is too high to cause low intensity of parts; 2, humidity, resulting in some plastic react with water, lower intensity and appear out cracking; 3, impurities in raw material or rebirth is expected to exceed bid; 4, raw material moisture content is too large; 5, the material itself is not appropriate processing environment or poor quality, the pollution will cause cracking. 6, raw material easy volatile matter beyond the standard; C, the mold precision: 1, the ejection to balance, sectional area should be enough, the draft should be enough, cavity surface are smooth enough, to prevent ejection residual stress concentration and cracking due to external force; 2, the structure of the parts can't be too thin, the transition part should adopt arc transition, avoid sharp corners, chamfering cause stress concentration; 3, as far as possible with a metal insert, in order to prevent the insert with different shrinkage internal stress caused by increasing parts; 4, molding process is not perfect, mainly displays in the convex and concave die forging billet internal quality is poor, there is something wrong with the heat treatment technology and process, cause the convex and concave die quenching, have a soft spot and uneven hardness; 5, to deep bottom parts should set appropriate demoulding intake channel, to prevent the formation of vacuum negative pressure; 6, the mainstream way enough ambassador gate before curing mold release, such easy to stripping; 7, the sprue bushing and the nozzle joint shall prevent cold hard material drag and make the parts stick on the fixed mould; 8, die structure is not reasonable. Thin punch without strengthening device design, discharging mouth not free a boundary discharge force had intensified ambassador punch under cyclic loading, etc. ; 9, mold temperature is too low, and poor liquidity of the melt.
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