Injection Molding craft adjusts a method

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Of the further progress of the equipment that note model and product quality requirement rise ceaselessly, shape to inject craft raised taller requirement. Choose injection equipment correctly, and reasonably set shapes craft, optimize craft condition, it is the key that improves product quality. The property that chooses correctly to note model machine to record model machine affects the quality of the goods that note model directly, different specifications reachs the machine noting model of performance demand, the price also can differ a lot of. When norms of the machine that note model chooses to choosing to note model machine norms, want to consider the condition that produces a pattern above all, the much more deputy mould that because same table notes model machine to often want to satisfy size,differs is produced, should note model machine norms certainly according to making dimension of a weight, mould wait, record model machine namely the greatest power that lock up a model and the biggest shot, like that the type with the norms model likely alternative that after offers according to fixing place of model aircraft manufacturer. Major firm offers a guest to make change a service, this noted model machine to offer huge to go to the lavatory to the choose and buy; Want to consider to whether need a few special configuration next, if need to choose special screw when the material such as manufacturing PA, PC, shape contain when taking the pattern that smoke core or takes off whorl, need to provide corresponding unit; Again, the factor that should have the side such as quality of structure, product according to the model will whether need to choose a few opportunity noting model that have special function certainly, if shape,thin wall grows products of going from place to place (point to L/D ﹥ commonly 300) when, need to choose tall inject speed to record model machine, accurate electron fittings needs to choose rigid full closed-loop control to note model machine to wait. At present the major opportunity that note model produces business but the machine noting model that custom-built client asks, this noted model machine to offer huge to go to the lavatory to the choose and buy. Set of the force that lock up a model is theoretic, can the force that lock up a model press type undertakes computational ﹕ Fcm>=K? Is P average? – of Fcm of the ﹕ in 10 type of A goods × locks up modular force, (KN) K – safety factor, take 1-1 commonly.

Antrum of model of 2P average – is average pressure (MPa) goods of A goods – is in the largest umbriferous area on mould cent face (Cm2) in be being produced actually, the adjustment of the force that lock up a model still should consider mould aborning be heated to expand the influence of a generation, should stay commonly have 0.

1-0.

The surplus of 2mm; The set principle of the force that lock up a model is to be below the premise that assures product quality with the small force that lock up a model advisable. Temperature of canister of makings of set of parameter of the craft that note model, mould temperature comes according to the function of different and plastic material temperature of canister of set screw makings, temperature of makings canister set is average tall at plastic melting point 10 ℃ - 30 ℃ . Must notice, because the data that different manufacturer place provides adds up to set prescription law or the differring that add auxiliary kind, their melting point and retention period allows to also can have difference in makings canister. Express as follows 1, the PA66 to Solutia company (the brand is 21SPC) the PA66 with Rhodia company (the brand is 25AE1) , retention period allows to undertake contrast below their melting point and each temperature. Mould temperature uses circular water to cool commonly when set, but when producing the product with exact size or exterior quality higher demand, should ask to use according to craft can have accurate pilot modular lukewarm machine. Time of inject of Nextpage inject dwell time, cooling time, dwell time and cooling time fibril occupy function of temperature of product ply, mould, material to wait have set. Inject time set is general the time that moves with completing inject journey at screw greatly slightly can, too long inject time not only meeting generation mechanical wear, specific power consumption increases wait for negative effect, also can lengthen at the same time shape periodic. Dwell time set comes according to product ply set, thin wall product is in when shaping but need not dwell time; When set dwell time, want product surface to not have only cave apparently can, usable also say serious way will decide, the time that till product quality changes no longer,extends dwell time stage by stage can be optimal dwell time surely. Cooling time needs to decide according to function of temperature of product ply, mould, material likewise, do not have commonly finalize the design polymer place needs cooling time to want to compare crystallization polymer time to grow. Set of inject pressure, speed inject pressure should abide by appropriate low the principle that shoulds not be tall, the inject rate that wants to be able to offer enough power achieve a requirement only, make fuse-element can is full of smoothly model antrum can, exorbitant pressure makes easily internal stress arises inside goods; But in shape when the products with dimension higher precision, contract to prevent a product excessive, what can use high-pressured force to inject to take off modular after in order to reduce product is contractive. Inject speed can affect the exterior quality of the product, its set should enrage a state to wait according to the geometrical structure of the mould, platoon have set, be in commonly make sure good exterior premise falls, raise inject rate as far as possible, fill up in order to decrease time. Shape in inject in, fuse-element is in inside the mould when flow, modular wall can form solidify layer, reduced consequently can flow the ply of the passageway, written guarantee according to the mould compose and inject speed differ commonly, modular wall can have 0.

The solidify layer that 2mm controls. Rapidder inject rate is used normally in shaping accordingly. Parameter of inject of inject journey, multistage is in in shaping, need affirmatory inject journey above all, theoretic, inject journey can press diameter of screw of – of Ds of bulk of runner of – of Va of amount of – of C of density of colophony of – of ρ of volume of product of – of Vp of journey of inject of – of S1­ of the ﹕ in type of Ds2 of ρ of S1=4(CVp+Va)/ of form calculation ﹕ antrum is in actual production, if foregone " product + runner " gross weight, can be calculated with next type S1= of inject journey ﹕ (M/Mmax) S1 of the ﹕ in · Smax+(5~10)mm type---Inject journey, mmM – " product + runner " gross weight, GMmax – records model machine the biggest shot, GSmax – records model machine journey of the biggest inject, mm by at runner system and mould appearance of each place geometry differs, pledge to satisfy a product the quantity asks, be opposite in different position the flow condition of fuse-element full a pattern (the pressure when basically pointing to flow, speed) have diverse demand. In an injection process, when screw advances fuse-element to the mould, requirement implementation has different pressure and rate locally in what differ, those who say for multistage inject shapes. General model when shape at least set 3 paragraphs or inject of 4 paragraphs of above just is more scientific, namely mainstream path place is the first paragraph, runner is the 2nd paragraph to runner place, the product is full of model antrum is made an appointment with 90% it is the 3rd paragraph, odd part is the 4th paragraph, law of usable computation weight will decide each paragraphs switch position is nodded; In actual production, should measure state of exhaust of structure of requirement, flow path, mould to wait to inject to multistage according to producing quality craft parameter undertakes science is analysed, reasonable set. Can use normally debug observation law to have set, the pressure that wants the place when inject to look for switch position to nod / speed set is 0, observe the trend position of fuse-element and product blemish condition, undertake adjustment stage by stage, till find out logical positional place. But must notice to owe the state of drawing of patterns that notes a product in the process that debugs observation, lest be in the mould is certain cave to place is noted because of owing and produce sticking to mould. Other craft parameter shapes in inject in, besides shape beyond the set of a few main parameter such as position of switch of inject of temperature, pressure, speed, time, multistage, still have the craft parameter of a lot of other, if rotate speed of back pressure, screw, screw pours all alone to prevent,flow delay and other set of each movement parameter, also cannot ignore its set. Example of craft parameter set in order to produce nylon bundle the line takes a product to be exemple, product quality asks ﹕ product reachs level of formulary pulling force; The surface does not have the of all kinds and undesirable phenomenon such as silver-colored silk, bleb, shrink mark; Shape after product is constrictive the gender is good, take off a phenomenon without the pine. Use material is PA66; Injection Molding machine is JSW1000-E Ⅱ - SP, mould structure is type of hot flow path, runner type is bit of runner. Decide ﹕ of principle of craft parameter set above all according to product characteristic and mould structure (1) because product flow length is longer, l/t (flow and wall are large than) for 511, should choose high speed inject to shape; (2) runner type is bit of runner, need the obstruction when using higher pressure to flow in order to overcome; (3) charge a pattern to make sure the product can be successful, frit makings must have good liquidity, shape temperature should proper on the high side; (4) when inject of high-pressured high speed comes to was not carried easy generation flash, forming machine must have switch of low inertial pressure, speed; (5) because product wall is large lesser, can not use protect pressure; Make each basically shape craft parameter sees a table 2. Parameter of protocol inject craft must know structure of equipment performance, mould, shape the information of the respect such as material and product quality requirement, science reasonably set shapes each parameter. Should shape according to the product above all the adjustment that the state undertakes craft parameter stage by stage, correct adjustment is temperature of → of pressure → speed orderly. When changing parameter every time, the parameter of the input already affirmed for computer place after undertakes next parameter is changed again, should avoid to change two above parameter at the same time; Enter stable production in the product next in, need the stability that maintains each parameter as far as possible, should make detailed record, if change when range is too big, answer to search an account in time. Additional, craft shapes to must be secured as far as possible when the line on the mould every time, pledge at finished product the quantity is controlled. 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