双色球除四走势图

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拉丝模的研究现状(下)

GAIJINSHEXIANGJIFAZHANQIANJING

拉丝模由模套、模芯2部分构成。模套多由高质量的钢制成(国内多为45钢),硬度为HRC20-25,模套与模芯之间采用过盈配合,以达到补强的作用,否则在拉拔高强度的线材时,模芯容易破裂。模芯是拉丝模双色球除四走势图的关键部分,根据用料的不同,可分为天然金刚石、单晶金刚石模、复晶金刚石模、硬质合金模等;对于硬质合金模来说,是由碳化钨和钴粉烧结而成的,模芯中钴的含量一般在3%—12%之间,烧结后模芯体积大约收缩15%—30%,形成质地均匀、硬度高、耐磨性极好的合金,其硬度在HRA86—93之间。因此,模芯的使用寿命主要取决于它本身的用料,并与拉拔线材的类型,润滑剂的性能,模芯的孔型及使用时模滑锥、工作锥、定径带和出口锥5部分组成。

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国内外修模技术综述

ZAILASIGUOCHENGZHONG,YOUYULABADECAIZHI、YASUOLV、RUNHUAHELENGQUETIAOJIANYIJICAOZUODENGYINSUDEYINGXIANG,SHILASIMO。MOSUNJIAOYANZHONGSHICHUXIANKONGJINGCHAOCHA。WEILEJIANGDICHENGBEN,TIGAOLASIMODELIYONGLV,WANGWANGXUYAOBALINJINDECHICUNZHONGXINDAMOJIXUSHIYONG。HELIDIAOHUANZHONGMOLASIMODEYUANZESHI,DANGMOZIMOSUNYISHIMOKONGBIAOMIANBIANCUZAOHUOMOKONGBIAOMIANLVEYOUZHANJIEJINSHUDEKELISHIJIUYINGLIJIGENGHUANYUYIXIUFU。

一般情况下,拉丝模修复程序分三步进行:
清洁处理→检查分类→修磨

(1) QINGJIECHULISHIJIANGHUISHOUDEJIULASIMOFANGRUQINGXIYEZHONG,YIQINGCHUNIANFUDERUNHUAJI,YOUWUJITIEXIUDENG,WEIXIUMOZUOHAOZHUNBEI。

(2) 检查分类。用10-25倍的放大镜或显微镜,对清洗后的拉丝模进行仔细披查分类。确定缺陷类别,对于大直径模用塞规,小直径模用塞入实验钢丝检查其尺寸。根据检查情况分类进行修磨,并检出无法修复的拉丝模。
(3) 修磨。对检查分类后的拉丝模分别按不同程序进行修磨,其修磨方法及适应范围如下:

a.抛光,模子抛光面存在环形变粗,工作角出现拉丝环,但定径带尺寸仍在公差范围内,一般采用手动抛光清除拉丝环。对表面进行抛光修复即可供拉丝模继续使用。
b.重磨及抛光,对于工作锥严重磨损,定径带有明显拉痕,定径带尺寸超出公差范围及严重不圆的拉丝模必须改制扩大到邻近的尺寸时,应进行扩孔后重磨,抛光加工。重磨工序和加工新模时相同。值得重视的是扩孔过程中中间尺寸的控制问题。因为拉丝模在扩孔机上加工完工作锥和出口锥后,会出现定径带完全消失的现象.


Tags:拉丝模
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