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Surface finishing is one of the most important processes in mould and die making. This process is necessary not only for smoothing the surface of die or mould, but also for removing the surface layer, which has been damaged by the preceding machining process and finally improve the performances and lifetime of moulds to a large extent. It has been reported that between 30% and 40% of the total time required to manufacture a die or mold is spent on finishing operations, most of which are performed by skilled workers employing traditional techniques. At present, key problems in mould and die finishing technology can improve the finishing efficiency, consistency and quality at reduced costs. A new and high efficiency unconventional finishing technology, pulse electrochemical finishing was introduced. Experiments were done in neutral nitrate electrolytes. The influence of electrolyte composition, intereletrode gap, finishing time, flow quality, current density, compositions of steel materials and pulse parameters on the resulting surface finishing was investigated. Results indicate that pulse parameters have important influence on operations finishing and the proper selection of pulse parameters can lead to both good smoothing efficiency and surface quality at low costs. 相似文献
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分析了银铸型模在使用过程中产生裂纹的原因,提出了七项消除或减少铸模裂纹的行之有效的措施,改进后铸模的寿命由平均每个2.34t提高到5.14t,吨银锭的铸模消耗降低120%,仅节约铸模每年为企业增加效益13万元,且银锭表观质量显著改善。 相似文献
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VIVIANA B SUÁREZ GUSTAVO J TREMMEL MAURICIO RIVERA JORGE A REINHEIMER CARLOS A MEINARDI 《International Journal of Dairy Technology》2012,65(3):410-415
A novel treatment using polyphosphates to protect cheeses against superficial mould growth was assayed. The treatments were: control commercial paint with natamycin (I), commercial paint based on polyvinyl–water (II), immersion in a saturated solution of polyphosphate (III), immersion and commercial paint (IV), commercial paint of polyphosphate solutions (V) and immersion and commercial paint of a saturated solution of polyphosphates (VI). The cheeses were ripened for 6 months. Superficial mould growth was inhibited in groups IV and VI when compared to cheeses from the control group (I). Statistical sensory analysis made between cheeses from groups IV and I (control) showed no significant differences. 相似文献
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本文试验研究了在砂型顶面用不同方法(盖塑料膜、喷水、喷粘土浆、撒粘土粉和细砂等)施加软复盖对砂型气流紧实效果的影响。试验表明:只要在砂型顶面形成一层不透气的软隔膜,均可提高气流紧实的效果;并改善砂型背面的松散状态。其中以复盖塑料膜最为简单可靠,软复盖的气流紧实还显著地提高低矮砂型的紧实效果。 相似文献
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本文在参考了国内外先进铸造工艺设计软件的基础上,开发了一种功能齐全的铝铸件砂型铸造工艺CAD软件,经生产验证,此软件操作方便,便于推广,并能大幅度缩短设计周期,减轻工作强度,提高设计质量。 相似文献
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为明确引起烟台地区甜樱桃采后腐烂的主要霉菌,对烟台采后腐烂甜樱桃中的霉菌进行分离,应用内部转录间隔区序列分析方法和形态学观察将分离的霉菌进行鉴定。选出代表性霉菌菌株回接樱桃,进行致腐性检测。结果表明:从烟台不同区县收集的腐烂樱桃中分离出的60株霉菌分属于6个种:燕麦赤霉菌(Gibberella avenacea)、总状毛霉菌(Mucor racemosus)、三线镰刀菌(Fusarium tricinctum)、互生链格孢菌(Alternaria alternate)、奥桑青霉菌(Penicillium polonicum)和烟曲霉菌(Aspergillus fumigatus),其中互生链格孢菌和总状毛霉数量较多,分别为14株和15株。将这些霉菌中的代表菌株重新接回到甜樱桃,均能引起甜樱桃的腐烂。 相似文献
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The antifungal effects of 22 essential oils from Turkish spices, herbs and citrus peel on four foodborne moulds were evaluated for fungistatic and fungicidal activity. The most active oils were wild thyme (Thymus rariflorus L) and thyme (Thymus serpyllum L). Parsley (Penloselinum sativum Hoffin) and savory (Satureja hortensis L) oils were found to be the least active oils. Rhizopus sp displayed the greatest tolerance, and the most sensitive mould was Penicillium chrysogenum. Prolonged incubations reduced the fungistatic and fungicidal effects of oils. It was concluded that some oils may be useful as mould inhibitors at food additive levels. 相似文献