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    铸钢(gāng)件的(de)分类及制造技(jì)术
    对于强度、塑性和韧性要求更高的机器零件,需(xū)要采(cǎi)用铸钢件(jiàn),铸钢件的产量仅次于铸铁,约(yuē)占铸件总(zǒng)产量的15%。  一、按照化学成分铸钢可分(fèn)为(wéi)碳素铸钢和(hé)合(hé)金铸钢两大类。其中(zhōng)以(yǐ)碳素铸钢应用最广(guǎng),占铸钢总产量的80%以上。   1、碳(tàn)素铸(zhù)钢   一般的,低碳钢ZG15的熔点较高、铸造性能差(chà),仅用(yòng)于制(zhì)造电(diàn)机零(líng)件或渗碳零(líng)件;中碳钢ZG25~ZG45,具有(yǒu)高于各(gè)类铸铁的综合性能,即强度高、有优(yōu)良的塑(sù)性和韧性,因此适于制造(zào)形状复杂、强度和韧性要求高的零件,如火车车轮、锻锤机架(jià)和砧座、轧辊和高压阀门等,是碳素铸钢中应用最多的一类;高碳钢(gāng)ZG55的熔点低,其铸造(zào)性能较中(zhōng)碳(tàn)钢的好,但其(qí)塑性和韧性较(jiào)差,仅(jǐn)用于制(zhì)造(zào)少数的耐磨件。   2、合金(jīn)铸钢   根(gēn)据合金元素(sù)总(zǒng)量的多少,合(hé)金铸钢可分为两低合金(jīn)钢和高合金(jīn)钢(gāng)大类。   (1)低合金铸钢,我国主要应用锰系、锰硅系(xì)及铬系(xì)等。如(rú)ZG40Mn、ZG30MnSi1、ZG30Cr1MnSi1等。用来制造齿轮、水压(yā)机工作缸和(hé)水轮机转子等零件(jiàn),而ZG40Cr1常用来制造高强度齿轮(lún)和高强(qiáng)度(dù)轴(zhóu)等重(chóng)要受力(lì)零件。   (2)高合(hé)金铸钢,具有耐磨、耐热或耐(nài)腐蚀(shí)等特殊性能(néng)。如高(gāo)锰钢ZGMn13,是一种抗磨钢,主要用于制(zhì)造(zào)在干磨擦(cā)工作条(tiáo)件下使(shǐ)用的零件,如(rú)挖掘机(jī)的抓斗前壁和抓斗齿、拖拉机和坦克的(de)履带等;铬镍不锈钢ZG1Cr18Ni9和铬不锈钢ZG1Cr13和ZGCr28等,对硝酸的耐腐蚀性很高,主要用于制(zhì)造化(huà)工、石油、化纤(xiān)和食(shí)品等设备上(shàng)的零(líng)件。   二、铸钢的铸造工(gōng)艺特(tè)点(diǎn)   铸钢的机械(xiè)性能(néng)比铸铁(tiě)高,但其铸(zhù)造性能却比铸铁差。因为铸钢的熔(róng)点较高,钢液易氧(yǎng)化、钢水的流动性差、收缩大,其(qí)体收缩率为(wéi)10%~14%,线收缩为1.8%~2.5%.为防止铸钢件产生浇不足、冷隔、缩孔(kǒng)和缩(suō)松(sōng)、裂纹及粘(zhān)砂等缺陷(xiàn),必须采取比铸(zhù)铁复(fù)杂的工艺(yì)措施:   1、由于(yú)钢液的流动性差,为防止铸钢件产(chǎn)生冷隔和浇(jiāo)不足,铸(zhù)钢件(jiàn)的壁(bì)厚不能小于(yú)8mm;浇注系统的结构力(lì)求(qiú)简单、且(qiě)截面尺寸(cùn)比铸铁(tiě)的大;采用干铸(zhù)型或热铸型;适当提高浇注温度(dù),一般为1520~1600℃,因为浇注温度高,钢水的过热度(dù)大、保持液态的时间长(zhǎng),流动性可得到改(gǎi)善。但是浇温过高(gāo),会引起晶粒(lì)粗(cū)大、热裂、气孔和粘(zhān)砂等(děng)缺陷(xiàn)。因(yīn)此一般小型、薄壁及(jí)形状(zhuàng)复(fù)杂的铸件,其浇注温度(dù)约(yuē)为钢的熔点(diǎn)温度+150℃;大(dà)型、厚壁铸件的浇(jiāo)注温度比其熔点高出100℃左右。   2、由于铸钢的(de)收缩大(dà)大超过铸(zhù)铁,为防止铸件出(chū)现缩孔、缩松缺陷,在铸造工艺(yì)上(shàng)大都采用冒口和、冷铁和补贴等(děng)措(cuò)施,以实现顺(shùn)序凝固。   此外,为(wéi)防止铸钢件产(chǎn)生缩孔、缩松、气(qì)孔和裂(liè)纹(wén)缺陷,应使(shǐ)其(qí)壁厚均(jun1)匀(yún)、避免尖(jiān)角(jiǎo)和直(zhí)角结构、在铸型用(yòng)型砂中加锯末、在型芯(xīn)中加焦炭、以及采用空心(xīn)型芯和油砂芯等来改善砂型或(huò)型(xíng)芯的退让性和透(tòu)气(qì)性。   铸钢的熔点高,相应的其浇(jiāo)注(zhù)温度(dù)也高。高温(wēn)下钢水与铸型材料相(xiàng)互作用,极(jí)易(yì)产生粘(zhān)砂(shā)缺陷。因(yīn)此,应采用耐火度(dù)较高的人造石英(yīng)砂做铸型,并在铸(zhù)型表面(miàn)刷(shuā)由(yóu)石英(yīng)粉或(huò)锆砂粉制得的(de)涂(tú)料。为减少气体来源、提高钢水流动(dòng)性及铸型强度,大(dà)多铸钢件(jiàn)用干型(xíng)或快干型来(lái)铸造,如采用CO2硬化的(de)水玻璃砂型。   三、铸钢件(jiàn)的热处理   铸钢件(jiàn)均(jun1)应(yīng)在热(rè)处理后使用。因为(wéi)铸态(tài)下的铸钢(gāng)件(jiàn)内部存在气孔、裂纹、缩孔和缩松、晶粒粗大、组织不均及残(cán)余内应力(lì)等铸造缺陷,使铸(zhù)钢件的强度、尤其是塑性和韧(rèn)性大大降(jiàng)低。   为细化(huà)晶粒、均匀组织(zhī)及消除内应力,铸钢(gāng)件必须(xū)进行正火或退火(huǒ)处理。正火处理后的(de)钢(gāng),其机械(xiè)性能(néng)较退(tuì)火后的高,成本也较低,所以应用较多(duō)。但由(yóu)于正火处理会引起较退火(huǒ)大(dà)的(de)内(nèi)应(yīng)力,只适用于含碳量小于0.35%的铸钢件。因为(wéi)低碳铸钢件的塑性好(hǎo),冷却时不易(yì)开裂。为减(jiǎn)小内(nèi)应力,铸(zhù)钢件在正(zhèng)火后,还(hái)应进行(háng)高温(wēn)回火。对于含碳量≥0.35%的、结构(gòu)复杂及易(yì)产生裂纹(wén)的铸钢件,只能进行退火处理。铸钢件(jiàn)不宜淬火(huǒ),否则极易开裂。   四、铸钢的熔炼   铸钢的熔炼一般采用平炉,电弧炉和(hé)感应炉等。平炉(lú)的特(tè)点是容(róng)量大、可利用废钢作(zuò)原料、能(néng)准确(què)控制钢的成分(fèn)并能熔炼(liàn)优质钢及低(dī)合(hé)金钢,多用于熔炼质量要求高(gāo)的(de)、大型(xíng)铸钢件用的钢液。   三相(xiàng)电弧炉的开(kāi)炉(lú)和(hé)停炉操作(zuò)方便,能(néng)保(bǎo)证钢液的成分和(hé)质量(liàng)、对炉料的(de)要求不甚严格、容易(yì)升温,故(gù)能炼(liàn)优质钢、高级(jí)合金钢(gāng)和特殊钢等,是生产成型铸(zhù)钢件(jiàn)的常用(yòng)设备。   此外(wài),采用工频或中频感应炉,能(néng)熔(róng)炼各种高级合金钢和碳(tàn)含量极低的钢。感应炉的熔炼速度快、合金元素烧损小、能源(yuán)消耗少(shǎo)、且钢(gāng)液质量高(gāo),即杂质含量少、夹(jiá)杂少。 

    2025-01 01

    全体荣誉
            热烈祝贺,在2024年九亿集团年度总结中, “浩渺行无极,扬帆但信风。”在多学科交叉为基础,多维度研究相结合的生命科学研究大整合的时代背景下,贵宾厅公司将乘着行业发展的东风,以专业、专注、诚信为本,回归科研、协助创新,不断超越,为广大用户提供更优质的产品和服务!"和顺祥机械被评为“2024年(nián)年度(dù)优秀(xiù)供应商”该(gāi)荣誉的获得离不开董事长侯战强,总经理张桥梁的(de)英明领导,离不开(kāi)全体员工的共同努力,更离(lí)不(bú)开全(quán)体员工家(jiā)属的大力(lì)支持,希(xī)望(wàng)在(zài)新(xīn)的一年里(lǐ)全体 “浩渺行无极,扬帆但信风。”在多学科交叉为基础,多维度研究相结合的生命科学研究大整合的时代背景下,贵宾厅公司将乘着行业发展的东风,以专业、专注、诚信为本,回归科研、协助创新,不断超越,为广大用户提供更优质的产品和服务!"和顺祥人共同努(nǔ)力(lì),再创辉煌!

    2024-12 30

    铸件缺陷的修补方法
    铸件(jiàn)在(zài)生产过程中由于操(cāo)作工艺或者经验的问题,都会导致铸件出现缺陷,这时候为了使铸件能够达到使用标准,减少损失浪费,往往会对缺陷进行修复(fù),那修复方法都有(yǒu)哪些呢?       一、铸工(gōng)胶水:简单(dān),粗放的(de)铸件,一般修补处(chù)不需要后(hòu)续加(jiā)工,且没(méi)有(yǒu)特殊的强(qiáng)度硬度要求。这(zhè)类铸件附(fù)加值比较低。      二(èr)、焊补:90%以上的铸造厂家(jiā)都选择焊补来解(jiě)决生产中遇到的铸(zhù)造缺陷。焊补修(xiū)复因采用了(le)金(jīn)属(shǔ)填充料,焊补(bǔ)处性能基本可(kě)以达到母材的标准,且操作简(jiǎn)单,焊补效率(lǜ)高,受(shòu)到许多厂家的认可(kě)和信赖。目前市(shì)场上,焊机(jī)种类比较多,应(yīng)用(yòng)在缺陷修复上(shàng),大体有以下几(jǐ)种:      电(diàn)焊机:铸铁、铸钢件焊补多(duō)采用的传统方式。      优点(diǎn):修复大(dà)缺陷,效率高。      缺点:焊后焊点上(shàng)硬(yìng)度过高,内部(bù)有应力,容易产生裂纹,一般还需要退火热处理才可以满足加工要(yào)求。且因(yīn)焊接条件限制,内部(bù)容易产生气孔、夹渣等(děng)二次缺(quē)陷。  氩弧焊:精密铸件,铝合金压(yā)铸件多采(cǎi)用氩弧焊机焊补(bǔ)。部分模具制造和修复厂家,也(yě)采用该焊机修复模具缺陷。      1、优(yōu)点:焊(hàn)补效率高,精度较电焊机高。焊丝种类较多,不锈钢(gāng)、铝(lǚ)合金产(chǎn)品上(shàng)应用最(zuì)广(guǎng)。可用于焊接,强度教高。      2、缺点:用(yòng)于缺(quē)陷修复,小缺陷(xiàn)修复时,因冲击过大,熔池边线有痕迹。焊(hàn)补钢件有硬点。由于热影(yǐng)响,焊补有色(sè)铸件或薄壁(bì)件时(shí),易产生热变形。操作技术要(yào)求较高。      三、冷焊(hàn)机:是21世纪(jì)初新诞生的修复技术,因焊补过程(chéng)中工件(jiàn)产生热量极(jí)小,被成为冷焊(hàn)机。经过几年的发展(zhǎn),焊机(jī)应用方向和技术都得到了很大的发展,已经在修复市(shì)场占有很大的(de)份额。按照修补产品(pǐn)分类有:贴片机(jī)和(hé)电火花堆(duī)焊修复机。     贴片机:采用瞬间(jiān)高频放电原理将焊片粘贴到工(gōng)件表面,每次粘贴厚(hòu)度最大等同(tóng)与焊片厚度(dù),焊接质量取(qǔ)决于放电是否均匀。适(shì)合于(yú)工件磨损,加工超差修复,在模具市场具(jù)有(yǒu)一定影响力(lì)。该机(jī)器也可以将焊(hàn)粉,填充到缺(quē)陷处,经放(fàng)电(diàn)后修复。修复后的工件色差小。缺(quē)点是修补(bǔ)的速度(dù)较(jiào)慢。冷焊机,共同(tóng)的缺点是,焊补效率不如电焊机(jī)和氩弧焊机高,但在(zài)修复(fù)毫米(mǐ)级缺陷和加工(gōng)面缺陷时,其突(tū)出的优势使人(rén)们更青睐(lài)于选择冷焊。

    2024-12 26

    “浩渺行无极,扬帆但信风。”在多学科交叉为基础,多维度研究相结合的生命科学研究大整合的时代背景下,贵宾厅公司将乘着行业发展的东风,以专业、专注、诚信为本,回归科研、协助创新,不断超越,为广大用户提供更优质的产品和服务!"和顺祥90后(hòu)00后(hòu)人(rén)才陪(péi)跑计划
    “浩渺行无极,扬帆但信风。”在多学科交叉为基础,多维度研究相结合的生命科学研究大整合的时代背景下,贵宾厅公司将乘着行业发展的东风,以专业、专注、诚信为本,回归科研、协助创新,不断超越,为广大用户提供更优质的产品和服务!"和顺祥公司(sī)推(tuī)出针对90后及00后(hòu)的人才培养(yǎng)计划(huá),该计划每(měi)年投入3万至20万元资金,旨在树立员工(gōng)职业理想(xiǎng),提升个人(rén)能力(lì),培养职(zhí)业爱好(hǎo)。培(péi)训内容涵盖(gài)专(zhuān)业知识与岗位技能,确(què)保员工全(quán)面(miàn)发展。此外(wài),每半个月举行一(yī)次例会,以加强沟通(tōng)与协作;今天举行挂牌仪式,由张总担任(rèn)组长亲自挂牌,办公室主(zhǔ)任(rèn)郝毅康负责具(jù)体事(shì)务。同时,公司还将聘请行业专家(jiā)进行(háng)指导(dǎo)培训,以提升培训质量和效果。 一(yī)、培(péi)养目标 1. 培(péi)养具有扎实的(de)机械(xiè)制图(tú)基础(chǔ)、较强的(de)计算(suàn)机辅(fǔ)助设计(CAD)和计算机(jī)辅助制造(CAM)能力的青年人才;2. 培养具备良(liáng)好的生产工艺和质量控(kòng)制意识的青年人(rén)才,确(què)保产品的质量和生产效率;3. 培养具备独立进行各工序设计(jì)、制造、维修和调(diào)整能(néng)力的青年人才(cái);4. 培养(yǎng)具备较高操作技(jì)能和安全(quán)意识(shí)的青年(nián)人才,降低生产过程中的安全事故风险及质量风险。 二、课程设置 1. 机械制(zhì)图基础:包括机(jī)械制图基本概念(niàn)、基本原理、图形符号、投影法等;2. CAD/CAM技术:AutoCAD、procast、SolidWorks等CAD/CAM软件(jiàn)的培训和使(shǐ)用;3. 铸造(zào)工艺学:砂型铸造(zào)的原理、工艺流程、质量控制方法等;              4. 模具设计与制造:模具设计(jì)原理、结构分析、材料选用、制造工艺等;5. 造型合箱:型砂的性能及检测、造(zào)型(xíng)方法(fǎ)、合箱操作(zuò)等;6. 熔炼(liàn)浇注:金属材料的(de)基础知识、冶(yě)炼方法、浇注过程及常见问题(tí)处理(lǐ)等;7. 其(qí)他相关环节:如(rú)热处(chù)理、表面处理、质量(liàng)检测等。8. 结合本人技能,岗位,爱(ài)好进行专门培训等。三、教学方法 1. 理(lǐ)论教学(xué):采用多媒体课件、实物演示、案(àn)例分析等多(duō)种方(fāng)式进行讲解,使学(xué)员能够全面理解知(zhī)识点;2. 实践(jiàn)操作:通(tōng)过现场(chǎng)教学(xué)、模拟操作等方式,让学员亲(qīn)自操(cāo)作设(shè)备,增强动(dòng)手(shǒu)能力和实践经验;3. 项目实践:结合企业实际(jì)生产案例(lì),让学员参与项目(mù)实(shí)施,提高分(fèn)析和解决问题的能力;4. 课程评价:采用课堂(táng)测验(yàn)、作业提(tí)交、项(xiàng)目(mù)成果展示等多(duō)种(zhǒng)方式,对学员的学习(xí)效果进行(háng)综合评价。 四、培训周期 培训(xùn)周(zhōu)期为6个月,分为两个阶段进行。第一阶段(duàn)(第1-3个(gè)月)为基础(chǔ)课(kè)程学习和实践操作练习阶段(duàn);第二阶段(第(dì)4-6个月)为专业课程(chéng)学习和项目实(shí)践阶(jiē)段。 五、后续发展与跟踪 1. 培训结束后,为学员提(tí)供一定期(qī)限的实践机(jī)会,以(yǐ)便于将所(suǒ)学(xué)知识应用(yòng)于(yú)实(shí)际工作中;2. 定(dìng)期关(guān)注学员的工作表现和发展情况,及时给予(yǔ)指导和支持,帮(bāng)助学员解决(jué)实际问(wèn)题;3. 建立完善的(de)激(jī)励机制,对取得优(yōu)异成绩的学员给予(yǔ)表彰和奖励,激发他们的工作热情和创新精神。  本(běn)青年人才(cái)陪跑计划旨在全面提高 “浩渺行无极,扬帆但信风。”在多学科交叉为基础,多维度研究相结合的生命科学研究大整合的时代背景下,贵宾厅公司将乘着行业发展的东风,以专业、专注、诚信为本,回归科研、协助创新,不断超越,为广大用户提供更优质的产品和服务!"和顺祥青年人才的技能和素质,为企业的发展提供有力的人才保障(zhàng)。我们将(jiāng)不断(duàn)优化课程设置和教学方式,确保培养出(chū)更多(duō)优秀的铸造人才,作为扩大生产后车间中层管理(lǐ)及推进数字(zì)化改造干部储备人才,推动 “浩渺行无极,扬帆但信风。”在多学科交叉为基础,多维度研究相结合的生命科学研究大整合的时代背景下,贵宾厅公司将乘着行业发展的东风,以专业、专注、诚信为本,回归科研、协助创新,不断超越,为广大用户提供更优质的产品和服务!"和顺祥铸(zhù)造产业的(de)发展。 2024年12月25日顺(shùn)祥90后00后(hòu)人才陪跑办(bàn)公室

    2024-12 24

    消失(shī)模(mó)的砂眼及(jí)气(qì)孔的解决方法(fǎ)
    1、  砂眼(或白灰)铸(zhù)件的致命缺(quē)陷,重则报(bào)废(fèi)。要做到(dào):①、 浇(jiāo)口(kǒu)杯、直浇道、横浇道、内浇道与(yǔ)铸(zhù)件(jiàn)封闭结合严密。如(rú)不严密(mì),在负(fù)压的作用下(xià)就会吸入(rù)砂子,所(suǒ)以(yǐ)装箱者一定要精心操作,把好各关口。任何一(yī)个薄(báo)弱(ruò)环节或(huò)疏忽都会(huì)造(zào)成此(cǐ)类缺陷。②浇注系统多刷一遍(biàn)涂料以增强(qiáng)其强度。③涂料的强度、透气性、刚度、耐火度、暴(bào)热抗烈性也很(hěn)重要,因(yīn)为在运输、装填砂、震动(dòng)时都会(huì)出现破坏、变形、开裂、脱落。④震实(shí)时,开(kāi)始幅度要小,待(dài)填满砂时再(zài)振(zhèn)幅大(dà)些。⑤浇口(kǒu)杯无浮砂、尘土等杂(zá)物。⑥浇注时,浇包嘴尽量靠近浇口杯,以免压力头过大。⑦负压过大,使金属液流(liú)经开裂(liè)、裂纹处(chù)时,吸入干(gàn)砂和杂(zá)物可能(néng)性加大,粘砂严重。⑧过快的充型(xíng)速度使冲刷力(lì)加(jiā)大(dà)。2、  气孔①浇注温度(dù)低,充型前沿金属液不能使泡沫充分分解汽 化,未分解的(de)残留物(wù)质来不及浮集到上面及冒口中,汽化(huà)分(fèn)解(jiě)生成(chéng)的气体(tǐ)及残留(liú)物不能及时排出铸型而凝固在铸件中,另外,摸(mō)样分解不充分,液相(xiàng)残留(liú)物会(huì)堵塞涂料层(céng),使热解气体排出受阻,腔(qiāng)内形成反压力,充型(xíng)流动性下(xià)降,凝(níng)固快。②涂料(liào)透(tòu)气(qì)性差或负压不足,砂子透气性差,不能及时排除(chú)型腔内的气体及残留物(wù),在充型压力下形成气(qì)孔。③浇注速度慢(màn),浇口杯未充满,暴露直浇道卷入空气,吸入杂质,形成携裹气孔和(hé)渣孔。④浇杯(bēi)容(róng)量小,金属液形成涡(wō)流(liú),侵入(rù)空气生成(chéng)气孔。⑤浇口杯及浇注系(xì)统之间的连接处(chù)密封不好,尤其是直浇道和浇口杯。在负压作(zuò)用下很容易形成夹砂及(jí)气孔。⑥型砂粒度太细,粉尘含量高,透气(qì)性差,负压管(guǎn)道内部堵塞,造(zào)成负(fù)压度失(shī)真(zhēn),使(shǐ)型腔周围的(de)负压值远低于指示负压(yā),汽(qì)化物不能及时排出涂料层(céng)而形成气(qì)孔或(huò)皱皮。⑦合理的浇注工艺(yì)和(hé)负压度。消失(shī)模浇注工艺是以充满(mǎn)封闭直浇道为原(yuán)则,不能忽快忽慢、紊流、断流(liú),更不(bú)允许暴(bào)露直浇(jiāo)道。浇注速度,尤其是在(zài)行车提升停顿瞬间力求平衡,不(bú)断流。进入尾期慢(màn)慢收包,使渣、气、及汽化(huà)残留物有(yǒu)充(chōng)分时间浮集到浇冒口中(zhōng)。负(fù)压度过大,加剧金属液渗透粘(zhān)砂,并造成附壁效(xiào)应,不利(lì)于液(yè)相泡沫被涂(tú)层(céng)吸附,生成很多气(qì)孔。适宜(yí)的(de)负(fù)压(yā)是(shì)排气(qì)的保证,也(yě)是防止粘砂的措施。⑧模样粘合应选用专用的热熔胶或冷胶,在保证粘(zhān)牢(láo)的情况下,用(yòng)量越少越好(hǎo)。尽量避(bì)免使(shǐ)用汽(qì)化(huà)缓慢(màn)的乳胶。

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