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style="font-weight:bold">机床é“怚g</a></b>的耐磨性和ž®ºå¯¸½E›_®šæ€?/a>,é“怚g质量å¯ÒŽœºæ¢îCñ”品的性能有很大媄å“?例如.直接影响机床的精度连¾l“寿å‘?各类æ³ëŠš„叶轮、壳体以及液压äšg内腔的尺寸、型¾U¿çš„准确性和概况¾_—æ‹™åº?直接影响泵和液压¾pȝ»Ÿçš„工作效çŽ?能量消耗和气蚀的发展等;内燃机çŽ×体、çŽ×盖、çŽ×套、活塞环、排气管½{‰é“¸ä»¶çš„强度和耐激å†äh¿€çƒ­æ€?直接影响发动机的工作寿命. </p> <p> é“怚g铔R€ æ–¹æ³•é€‰æ‹©çš„原则:é“怚g优先采用砂型铔R€?主要原因是砂型铸造较之其它铸造方法老本低、生产工艺简单、生产周期短。当湿型不能满èƒö要求时再考虑使用¾_˜åœŸç ‚表òq²ç ‚型、干砂型或其它砂型。铸仉™“¸é€ æ–¹æ³•åº”和生产批量相适应,低压铔R€ ã€åŽ‹é“¸ã€ç¦»å¿ƒé“¸é€ ç­‰é“”R€ æ–¹æ³•ã€‚可以有各种不同的强度、硬度、韧性配合的¾l¼åˆæ€§èƒ½åQŒé“¸ä»¶æœ‰ä¼˜è‰¯çš„机械、物理性能。还可兼具一¿Uæˆ–多种ç‰ÒŽ®Šæ€§èƒ½åQŒå¦‚耐磨、耐高温和低温、耐腐蚀½{‰ã€?</p> <p> é“怚g的重量和ž®ºå¯¸èŒƒå›´éƒ½å¾ˆå®½ã€‚重的可辑ֈ°400吨,壁厚薄的只有0.5毫米åQŒåŽšå¯è¶…˜q?¾c»I¼Œé•¿åº¦å¯ç”±å‡ æ¯«¾c›_ˆ°åå‡ ¾c»I¼Œå¯æ»¡­‘³ä¸åŒå·¥ä¸šéƒ¨é—¨çš„使用要求。一般对é“怚g的外观质量,可用比力样块来判断铸件概å†ëŠ²—拙度åQ›æ¦‚å†ëŠš„¾l†å¾®è£‚纹可用着色法、磁¾_‰æ³•‹‚€æŸ¥ã€‚对é“怚g的内部质量,可用音频、超声、涡‹¹ã€Xž®„线和Λ_°„¾U¿ç­‰æ–ÒŽ³•æ¥æ£€æŸ¥å’Œåˆ¤æ–­ã€?</p> <p> é“怚g质量å¯ÒŽœºæ¢îCñ”品的性能有很大媄响。例如。直接媄响机床的¾_‘Öº¦˜qžç»“寿命åQ›å„¾cÀL܇的叶轮、壳体以及液压äšg内腔的尺寸、型¾U¿çš„准确性和概况¾_—拙度,直接影响泵和液压¾pȝ»Ÿçš„工作效率,能量消耗和气蚀的发展等åQ›å†…燃机¾~怽“、çŽ×盖、çŽ×套、活塞环、排气管½{‰é“¸ä»¶çš„强度和耐激å†äh¿€çƒ­æ€§ï¼Œç›´æŽ¥å½±å“å‘动机的工作寿命ã€?</p> <p> 影响é“怚g质量的因素很å¤?除了要根据工作条件和金属资料性能来确定铸件几何åŞ状、尺寸大ž®å¤–,˜q˜å¿…需从铸造合金和铔R€ å·¥è‰ºç‰¹æ€§çš„角度来考虑设计的合理æ€?åÏx˜Žæ˜„¡š„ž®ºå¯¸æ•ˆåº”和凝固、收¾~©ã€åº”力等问题,以防止或减少é“怚g的成分偏析、变形、开裂等¾~ºé™·çš„发ç”?要有合理的铸造工è‰?åÏx ¹æ®é“¸ä»¶ç»“构、重量和ž®ºå¯¸å¤§å°,铔R€ åˆé‡‘特性和生äñ”条äšg,选择合适的分型面和造型、造芯æ–ÒŽ³•,合理讄¡½®é“”R€ ç­‹ã€å†·é“ã€å†’口和‹¹‡æ³¨¾pȝ»Ÿ½{?以保证获得铸ä»?½W¬ä¸‰æ˜¯é“¸é€ ç”¨åŽŸææ–™çš„质量.金属炉料、耐火资料、熔剂、蜕变剂以及铔R€ ç ‚、涂料等材料的质量不合尺åº?会ä‹Éé“怚g发生气孔、粘砂等¾~ºé™·,影响é“怚g外观质量和内部质é‡?严重时会佉K“¸ä»¶æŠ¥åº?½W¬å››æ˜¯å·¥è‰ºæ“ä½?要制定合理的工艺操作规程,提高工äh的技术水òq?使工è‰ø™§„½E‹å¾—到正¼‹®å®žæ–?¼‹®å®šé“”R€ å·¥è‰ø™¿‡½E‹æ–¹æ¡ˆæ—¶,必需对具体的é“怚g˜q›è¡Œå…·ä½“的分æž?选择合理的工艺方æ¡?é“怚g有优良的机械、物理性能,可以有各¿Uä¸åŒçš„强度、硬度、韧性配合的¾l¼åˆæ€§èƒ½,˜q˜å¯å…¼å…·ä¸€¿Uæˆ–多种ç‰ÒŽ®Šæ€§èƒ½,如耐磨、耐高温和低温、耐腐蚀½{?é“怚g的重量和ž®ºå¯¸èŒƒå›´éƒ½å¾ˆå®?重的可达åˆ?00å?壁厚薄的只有0.5毫米,厚可­‘…过1¾c?长度可由几毫¾c›_ˆ°åå‡ ¾c?可满­‘³ä¸åŒå·¥ä¸šéƒ¨é—¨çš„使用要求. </p></p> </div> <div class="pagess"> <ul><div>上一æ?<a href="536.html">铔R’¢ä»¶åŠ å·¥çš„常见工艺有哪些?</a></div> <div>下一æ?<a href="534.html">【推荐】精密铸件的热处理_压铸机的选用æ–ÒŽ³•</a></div> </ul> 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