又粗又长又硬爽死我了动态图

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frpp管管材切斷方法沖切過程

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    ()沖切法

    沖切法是沖壓剪切法的簡稱,即在壓力機上利用模具對管材實施切斷。該方法適用于管材相對厚度t/D<0.1的薄壁管(D—管材外徑,t—管材壁厚)。

    1.frpp沖切過程

    管材沖切過程所示。當壓力機滑塊下行時,切刀刃尖與管壁接觸,使管壁產生彈性變形。隨著切刀續續下行,壓力逐漸增加,壓力達到一定值時,刃尖與管壁接觸處的材料發生塑性變形,同時刃尖開始壓人材料。隨著刃尖壓人程度的增加,出現了應力應變的高度集中,導致材料瞬間脆裂,刃尖隨之進入管腔。然后切刀側刃與凹模側開始剪切管壁,直至完全切斷管材為止。

    為了減小管材被壓扁的現象,通常將凹模做成少許的桃形,以便沖切前先使管材在左、右半凹模的強力夾持下產生一定量的反變形(使管壁上部突出),然后再由切.刀沖切,星p可減少管材被切刀壓扁的缺陷。

    分析frpp管材沖切過程可知,開始切管時,切屑是向內形成的。此時凹模不起剪切作用,管材壓扁現象也就在此時產生,因而應盡量縮短這一過程,為此,切刀曲線形狀必須做得細而長,但強度差易折斷。若做出的刀刃形狀寬而短,則切刀強度好,但切屑易向內形成,使壓扁現象嚴重。不利于沖切過程進行。因此,合理確定切刀曲線形狀及尺寸。是沖切法成敗的

關鍵。

   2.切刀形狀及尺寸

    切刀型式所示,切刀刃尖做成寬度為右并呈30的尖劈,尖劈后面做成帶一定形狀的曲線,PPR管材設計該曲線形狀時必須考慮以下因素:切屑力求向外形成以減小壓扁現象;切刀應有足夠的強度;曲線形狀應易于磨削加工。目前生產中采用的一切刀曲線多為圓弧形,這不僅易于磨削加工,而且也能較好地滿足沖切要求,收到了良好的效果。實踐證明,frpp雙圓弧切刀要比單圓弧的好。這是由于雙圓弧切刀沖一切時,管材上部約1/4的廢料先被切斷并掉入管腔內,因此有利于后續的沖切工作。下面分別介紹單、雙圓弧切刀尺寸參數的確定方法。

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又粗又长又硬爽死我了动态图
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