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注塑機及其的控制外文翻譯-預(yù)覽頁

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【正文】 , medium/high cost Handles, levers, small housings, zip ties Polyamide 11+12 PA11+12 High strength, Air filters, (Nylon) fatigue resistance, chemical resistance, low creep, low friction, almost opaque to clear, very high cost eyeglass frames, safety masks Polycarbonate PC Very tough, temperature resistance, dimensional stability, transparent, high cost Automotive (panels, lenses, consoles), bottles, containers, housings, light covers, reflectors, safety helmets and shields Polyester Thermoplastic PBT, PET Rigid, heat resistance, chemical resistance, medium/high cost Automotive (filters, handles, pumps), bearings, cams, electrical ponents (connectors, sensors), gears, housings, rollers, switches, valves Polyether Sulphone PES Tough, very high chemical resistance, clear, very high cost Valves Polyetheretherketone PEEKEEK Strong, thermal stability, chemical resistance, abrasion resistance, low moisture absorption Aircraft ponents, electrical connectors, pump impellers, seals Polyetherimide PEI Heat resistance, flame resistance, transparent (amber color) Electrical ponents (connectors, boards, switches), covers, sheilds, surgical tools Polyethylene Low Density LDPE Lightweight, tough and flexible, excellent chemical resistance, Kitchenware, housings, covers, and containers natural waxy appearance, low cost Polyethylene High Density HDPE Tough and stiff, excellent chemical resistance, natural waxy appearance, low cost Chair seats, housings, covers, and containers Polyphenylene Oxide PPO Tough, heat resistance, flame resistance, dimensional stability, low water absorption, electroplating capability, high cost Automotive (housings, panels), electrical ponents, housings, plumbing ponents Polyphenylene Sulphide PPS Very high strength, heat resistance, brown, very high cost Bearings, covers, fuel system ponents, guides, switches, and shields Polypropylene PP Lightweight, Automotive heat resistance, high chemical resistance, scratch resistance, natural waxy appearance, tough and stiff, low cost. (bumpers, covers, trim), bottles, caps, crates, handles, housings Polystyrene General purpose GPPS Brittle, transparent, low cost Cosmetics packaging, pens Polystyrene High impact HIPS Impact strength, rigidity, toughness, dimensional stability, naturally translucent, low cost Electronic housings, food containers, toys Polyvinyl Chloride Plasticised PVC Tough, flexible, flame resistance, transparent or opaque, low Electrical insulation, housewares, medical tubing, shoe soles, toys cost Polyvinyl Chloride Rigid UPVC Tough, flexible, flame resistance, transparent or opaque, low cost Outdoor applications (drains, fittings, gutters) Styrene Acrylonitrile SAN Stiff, brittle, chemical resistance, heat resistance, hydrolytically stable, transparent, low cost Housewares, knobs, syringes Thermoplastic Elastomer/Rubber TPE/R Tough, flexible, high cost Bushings, electrical ponents, seals, washers Possible Defects Defect Causes Flash ? Injection pressure too high ? Clamp force too low Warping ? Nonuniform cooling rate Bubbles ? Injection temperature too high ? Too much moisture in material ? Nonuniform cooling rate Unfilled sections ? Insufficient shot volume ? Flow rate of material too low Sink marks ? Injection pressure too low ? Nonuniform cooling rate Ejector marks ? Cooling time too short ? Ejection force too high Many of the above defects are caused by a nonuniform cooling rate. A variation in the cooling rate can be caused by nonuniform wall thickness or nonuniform mold temperature Cost Drivers Material cost The material cost is determined by the weight of material that is required and the unit price of that material. The weight of material is clearly a result of the part volume and material density。 在設(shè)備制造過程中,預(yù)先設(shè)定的參數(shù)值,如從機器的鎖模力,循環(huán)時間,溫度等,在生產(chǎn)過程中予以保留。 閉環(huán)控制系統(tǒng)采用了負反饋回路,抗干擾能力強,當注射速度,注射壓力,模腔溫度,模腔壓力,熔體溫度和壓力油,由于干擾,在生產(chǎn)過程中通過機器的偏差自適應(yīng)控制系統(tǒng)的干擾進行自動修正。 常用的注塑機控制系統(tǒng)有三種,即傳統(tǒng)的 基于繼電器,可編程控制器和基于計算機的控制類型。 政協(xié)形成了注塑機控制系統(tǒng),以實現(xiàn)包括位置控制,速度控制,溫度控制,故障控制和實時顯示整個過程中,如注塑成型的各種控制,可以大大提高塑料制品 的質(zhì)量有利于提高經(jīng)濟效益。1 ℃ 。 因此,雙點,即表面 ,在同一時間在每桶深平行檢測設(shè)置熱電偶,將是相對穩(wěn)定的溫度曲線,有利于溫度控制精度。 前一種方法中,以加熱載體的出口對象的控制溫度,相對簡單,并能滿足一般的溫度控制要求。 一般通過位移 /速度傳感器,壓力傳感器,閉環(huán)注射控制,高響應(yīng)伺服閥配合使用,實現(xiàn)注塑成型工藝,熔膠背壓,注射速度和精確控制的條件下包裝。 傳輸模式控制過程應(yīng)該是另一個重要的變量是位置。 可編程計算機控制器( PCC)就是代表這新一代可編程控制器的發(fā)展趨勢。 這種待遇,直接導致 “控制速度 ”,在應(yīng)用程序的大小取決于,這個結(jié)果是毫無疑問的高要求宗教在實時控制 I / O 通道。 PCC 的應(yīng)用程序模塊,從多任務(wù)結(jié)構(gòu),應(yīng)用軟件開發(fā)項目帶來了極大的便利。 在硬件結(jié)構(gòu), PCC 的特點非常顯著。 PCC在工業(yè)控制中強大的優(yōu)勢,并展示了可編程控制器與工業(yè)控制計算機及 DCS(分布式工業(yè)控制系統(tǒng))技術(shù),融合的發(fā)展趨勢,雖然這仍然是一個相對年輕的技術(shù),但在其多來越來越多的應(yīng)用領(lǐng)域,它正日益顯示出其發(fā)展?jié)摿Σ豢傻凸馈?梢允褂么蠖鄶?shù)的聚合物,包括所有熱塑性塑料,一些熱固性塑料和一些彈性體。雖然每種材料 都 有不同的屬性 ,并 會影響 部件的 強度和最后的的功能, 而且 這些屬性還要 求處理這些材料中使用的參數(shù)。 可能的缺陷 缺陷 原因 閃存 ? 注射壓力過高 ? 夾緊力 太 低 翹曲 ? 非均勻冷卻速度 泡沫 ? 注塑溫度太高 ? 在材料中的水分過高 ? 非均勻冷卻速度 空心的截面 ? 不足 槍 卷 ? 流量的材料太低 沉標記 ? 注射壓力太低 非均勻冷卻速度 引射器標記 ? 冷卻時間太短 ? 射血力太高 上述缺陷的很多是由非均勻冷卻造成的。該材料,包括所需材料的重量,填補了模具的渠道。注塑機通常是指由它們提供的夾緊力噸位。零件的大小也必須符合其他機器的規(guī)范,如鉗中風,壓板尺寸和拍攝能力。冷卻時間也 是為了 減少墻體厚度,因為它們 所有的工序 需要較少的時間 冷卻 ,材料熱力學的幾個性質(zhì)也影響了冷卻時間
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