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在對使用聚合物螺母的導(dǎo)螺桿裝置進(jìn)行正確設(shè)計與選型時，壓力速度 (PV) 因子是一個關(guān)鍵設(shè)計參數(shù)。雖然大多數(shù)工程聚合物都列出了 PV 參數(shù)，但在考慮螺母負(fù)荷額定值時，這個參數(shù)一般都被忽略了，更多地被應(yīng)用于徑向襯套和滑動應(yīng)用。
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PV 參數(shù)通過螺母和螺桿之間壓力和速度的乘積來定義導(dǎo)螺桿裝置的性能范圍。塑料具有一個固有的 PV 額定限值，而在某些條件下運行的系統(tǒng)的 PV 可以計算出來。簡單地說，施加到導(dǎo)螺桿上的負(fù)荷越大，就必須將它轉(zhuǎn)動得越慢，以避免超過螺母的 PV 限值。反之亦然，速度越大，負(fù)荷容量越小。
塑料的 PV 額定值是由特定產(chǎn)品的材料復(fù)合人員賦予的。常見的復(fù)合塑料有杜邦公司的 Delrin® AF、Quadrant 公司的 Torlon® 和 GE Plastics 公司的 LNP Lubriloy。材料復(fù)合人員負(fù)責(zé)對所選的樹脂和添加劑進(jìn)行配方設(shè)計。添加劑通常用來提高結(jié)構(gòu)和摩擦性能。材料復(fù)合人員通常使用材料圓盤在一個鋼表面上進(jìn)行 PV 測試。通過改變樣品的負(fù)荷和速度，可測出磨損拐點，因而測出材料的 PV 限值。 雖然基礎(chǔ)樹脂具有一個特定 PV 額定值，但通過添加潤滑劑和其他復(fù)合物，可將該額定值大大提高。這樣就為設(shè)計人員提供了很大的靈活性，可以針對他們的應(yīng)用取得適宜的 PV 范圍。應(yīng)該注意的是，各個公司的測試方法有所不同，因此在選擇一種材料時，最好要對來自單一材料復(fù)合人員的不同塑料進(jìn)行比較。我們將會看到，也可以通過改變導(dǎo)螺桿部件的幾何形狀來改變系統(tǒng)的 PV 值。
令人吃驚的是，大多數(shù)設(shè)計人員在設(shè)計他們的系統(tǒng)時，只是簡單地考慮螺母負(fù)荷額定值，而忽略速度的影響，這會導(dǎo)致迅速而突然的失效。導(dǎo)螺桿的主要失效模式為磨損和 PV。當(dāng)摩擦產(chǎn)生的熱量積累到超過螺母的最高使用溫度時，會導(dǎo)致PV失效。在較低的PV 值下，磨損速度增加，從而會縮短螺母的使用壽命。通過在 PV 值范圍內(nèi)進(jìn)行設(shè)計，可以使得失效只是因磨損而發(fā)生。磨損是一種較慢和線性程度較大的失效類型，可以在設(shè)計中加以考慮。
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