Acquire better exterior quality

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-- Moldflow is using path of needle type thermal current to eliminate the applied car bumper in frit lapping defect to wait large make because the wall is large,be less than 4mm, and size is enormous, be in normally in process of the figuration that note model, appear easily a variety of undesirable phenomena such as frit lapping defect. Use needle type to heat up flow path gating system to be able to eliminate flaw not only, and can shorten control a figuration cycle. As Chinese automobile industry swift and violent development, the user is right large note model exterior quality requirement is even more strict also. With respect to large Injection Mold Tooling, had not been confined to in order to flow, protect pressure, refrigeration and the strict control that note the parameter such as model craft will improve product quality, higher demand is to eliminate frit lapping defect and fuse-element flow forward position to hand in collect because place is in-house much tropism of the element and the stress concentration that cause. Be based on such development demand, the traditional pattern that enter glue cannot have been satisfied make figuration demand. For this, we introduce needle type to heat up the technology of runner of a powerful person of flow path programme controll to solve difficult problem of this one technology. The advantage needle type of technology of figuration of path of needle type thermal current heats up flow path technology to control a technology with its peculiar process, can rise on higher rate make dependability, make the fuse-element flow in three-dimensional model antrum faster, smoother, to make bring faster total cycle time, rising make a character go up rise to weigh wanted action particularly. 1.

Through dominating runner open time, assure model antrum fill is smooth reach fuse-element to shed dynamic balancing, eliminate frit lapping defect. Large note model note model to make need two normally or flood of ability of many hot runner. To average hot gating system, injecting in the begining runner subsequently at the same time open. Such means that enter glue is put inevitably in fusion blemish, it is namely when forward of two frit makings is confluent, as a result of two fuse-element cannot complete frit is an organic whole, and form fusion print, reaction is in goods is the frit lapping defect that says normally apparently. Although can expect through raising frit temperature, increase dwell pressure and adjust the method such as parameter of the craft that note model to undertake ameliorative, but improve the result actually finite. Use technology of line of needle type thermal current to come compose builds gating system, can realize programme controll the open of runner of each a powerful person and shut, controallable just had shed runner of the 2nd a powerful person in the first fuse-element when, open of needle of a powerful person, open the 2nd runner, perhaps can shut the first runner according to needing open right now, undertake going down to be opened to mix till all runner all the time model antrum is full of, make fuse-element complete fusion, get do not have goods of frit lapping defect (graph 1) . The switch that can pass runner of a powerful person will obtain the flow condition of a balance. Graph 1 fuse-element is poured out of from GATE1, when forward of going from place to place passes GATE2, open GATE2, with this analogize 2.

Use what this technology obtains to make a product won't have rudimental runner mark, accordingly, machine exterior quality to ask applicably taller note model. Because runner of a powerful person is making a mark that go up,the account that some moment use runner of a powerful person is flowing, be equivalent to a top giving the mark of the bequeath that sell institute only, so it and conceal type runner and other type thermal current photograph of the trace that carry a department is smaller than wanting much. 3.

More effective control is protected press and figuration is periodic. Path of needle type thermal current can use the runner of bigger diameter, can make fuse-element is accelerated in the flow in modular antrum, shorten thereby control a figuration cycle, and can better protect pressure. 4.

Reduce the internal stress of goods effectively, rise make a stability. The place before be like is narrated, two fuse-element in traditional hot gating system can form frit lapping defect after forward of going from place to place is confluent, its affect goods exterior only not simply as a result, making an interior easily also produce greater leftover internal stress at the same time. This kind of stress centers a phenomenon to will reduce the intensity of goods. If use runner of a powerful person to control a technology to control the order entering glue of fuse-element, what can avoid fuse-element flow forward effectively is direct hand in collect, avoided stress to center phenomenal generation thereby, rose to make then stability. In addition, the stock when use needle type heats up the mouth to still can prevent to flying a model sucks those who reach the phenomenon that pull silk to appear instead. The motion of needle of a powerful person of construction of system of needle type hot flow path and path of thermal current of principle needle type can pass bedspring to control, also can use the control such as atmospheric pressure or hydraulic pressure, its configuration is varied. To car bumper such large note model, we use oil pressure crock to control the movement of needle of a powerful person normally. Its advantage is a structure simple, treatment is convenient, cost is relatively inferior, stability is better, the open of runner and shut time control is more reliable also. If the graph is shown 2 times, part of hot flow path can with common thermal current gating system is same, it is part of hot mouth of path of needle type thermal current only than common thermal current among hot mouth much a structure -- needle of a powerful person, needle of this a powerful person is needle of one-way a powerful person, dominate the action of needle of a powerful person by oil pressure crock. Graph example of application of Moldflow of construction of road of thermal current of 2 needle type is with mould of the bumper after the car exemple, should make a dimension be 870mm of × of 490mm of 1 700mm × , have very high technology to machine a requirement, must assure for example model antrum fill balance, make sure face of end item exterior does not have existence of frit lapping defect to wait, to Kong Weiao defect place does not make a demand temporarily. Adopt the purpose of Moldflow software and imitate requirement: Forecast make a position of frit lapping defect and length, decide its result, if cannot satisfy a requirement, should convert system of road of needle type thermal current, it is in Moldflow imitate its fill process. 1.

Plan one: Of gating system of common hot flow path build compose and imitate. Ask the parameter that needs treatment part to guide above all in Moldflow software, undertake building a model, the gating system that if the graph shows 3 times,installs: Implementation heats up the mouth 3 times at the same time open, enter glue at the same time. Graph 3 to path of common thermal current in Moldflow software gating system builds a model the graph is shown 4 times analyse a result to pass Moldflow software simulative, zun Tu analyses a result for flow, right graph analyses a result for frit lapping defect. From the graph 4 in case of indication going from place to place and position of frit lapping defect can see, use 3 hot mouths to enter glue at the same time, assured balance sex of flow. But, two fuse-element still cannot complete fusion is an organic whole, what be close to position of geometry of two glue mouth is mid hand in collect place, form visible frit wiring, and length is longer, cannot satisfy make exterior requirement. Software of graph 4 Moldflow is analysed to figuration of gating system of common hot flow path 2.

Plan 2: Needle type heats up those who shed gating system to build compose and imitate. Build gating system in the compose in Moldflow software above all, runner position still with plan 1 medium position is same, and control of runner of needle of instead of runner parameter setting, runner condition installs as follows: Injection Time setting is 7s; Initiative condition setting is intermediate runner Open, shut after 30s (in real stuff process, this runner condition is open all the time) ; Initiative condition installs both sides runner to be Closed together, 3.

Open of the runner when 8s. Next, undertake imitate is analysed, if pursue,reach 5 show a result, zun Tu analyses a result for flow, right graph analyses a result for frit lapping defect. Software of graph 5 Moldflow heats up analysis of figuration of flow path gating system and graph to needle type 4 analysises are compared as a result, can see apparently, plan 2 in not only came true more the fill of the balance, and eliminated program completely one in wiring of two when appear bigger frit (graph 4 in circle demarcate is in) . The last word passes use Moldflow software, under thick to the wall 4mm large note model (the bumper after be like a car) figuration process undertakes numeric imitate is analysed, in Moldflow software imitate builds compose needle type to heat up flow path gating system, imitate runner of a powerful person eliminates the frit lapping defect, process that improves goods exterior quality successfully, combine numeric imitate result, optimize the time of sequence control of runner of a powerful person in real take shape, reduced the air plane number of real take shape greatly, shortened effectively control a figuration cycle. CNC Milling