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您的位置: 首頁 ->  技術支持 -> 五金沖壓常見毛刺問題的產生原因

五金沖壓常見毛刺問題的產生原因


  一,四周產生較厚而高的毛刺
  剪切斷面的塌角和傾斜角大,而中部呈現明顯的凹狀,毛刺不但高,而且截面呈三角形,不使用銼刀就不能去除。這種沖壓件一般都是殘次品。
  產生原因:(1)間隙過大;(2)在多次研磨中,凹模的垂直度降低,對于全錐度凹模而言,則是由于再研磨而出現超差。
  解決辦法
  縮小間隙:(1)形狀簡單,體積小時可返工制作;(2)沖壓小而薄的產品,可進行電火花硬化加工處理;(3)將模具退火,修復刃部,再進行熱處理和研磨;(4)堆焊修復處理;(5)壓鑲塊時要用模具墊板,待壓出刃部后再進行加工。
  二,毛刺的高度不齊
  間隙過大或過小時,毛刺的高度增加。其中,間隙過大,產生三角毛刺,厚度增加,間隙過小,毛刺薄而高,產生二次剪切。
  產生原因:(1)間隙局部不一致;(2)刃口的塌邊引起局部偏差;(3)由于模具偏心會導致毛刺高度相一半不一致,模具安裝不好,導柱裝配不好;(4)導柱松動;(5)壓機精度差。
  解決辦法:(1)去毛刺后,產品剪切斷面形狀不平時,是因為間隙局部過大或過小,故需加以修正。(2)刃口受到局部磨損,或者由于淬火硬度差,局部產生塌邊,毛刺根部增大,故需進行研磨。(3)凸模與凹模不同心,這是由于剪切斷面一半過大,一半過小,這一點很容易理解。如果是模具或導柱裝配不好的原因,進行調整就可以了。但是,如果每個行程中模芯位置都有改變的話,則是由于模具裝配部分松動,需取出模芯加以緊固校正口(4)沖壓時由于受到推力的作用,會產生不同心。當側承塊或導承板受力時,為了保證精度,必須使用導桂,但使用導柱后,如果同心度還不好,則是因為導柱質星差之故。(5)壓力機不好。
  三,剪切斷面處出現大毛刺(壓縮毛刺)
  剪切斷面某處出現明顯舌狀部分,稱為壓縮毛刺。
  產生原因:(1)間隙整體偏小,并且凹模刃口某處出現塌角或缺口,(2)凹模后角出現倒錐度,(3)凹模孔精加工困難,有粗糙面,壓壞了裂面高的部分。
  解決辦法:(1)調整間隙,修磨刃口。(2)用砂輪去除由于反復碰撞而產生的凹模后角光亮部。(3)修模模孔垂直壁接觸斑點嚴重的部分。
  四,剪切斷面呈現線狀筋條
  所謂線狀筋條,就是剪切斷面部位出現凸形線條或凹形線條的現象。
  產生原因:(1)凹模某處有缺口或卷刃等損傷,(2)由于潤滑劑選擇不當或不足,引起橫具燒蝕,(3)斷屑或異物混入,粘著在模具上。
  解決辦法:(1)模具在定心操作中卡死,或者由于模具硬度過高,引起崩缺或卷刃。前者最好修磨咬死部分,而后者最好降低模具硬度,否則,將再次發生崩缺和卷刃。(2)如果是因為沖壓加工過程中發熱引起毛坯膨脹而卡死在模具內璧,刮傷模具,必須在采用后角的同時,改變潤滑劑。(3)如果因收縮或異物融著在凹模內璧上使其產生缺陷,則必須采取不使污垢附著在毛坯上的措施。
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