棉秆重组方材握钉力研究

A Study on Nail and Screw Holding Power of Reconstituted Square Lumber Made from Cotton Stalk

棉秆重组方材是一种新型生物质代木材料。以棉秆重组方材为试验材料,采用正交试验研究螺钉种类、导孔直径以及拧入深度3个因素对基材端面、侧面及板面握钉力的影响,以期为棉秆重组方材家具螺钉连接提供数据参考。结果表明:棉秆重组方材板面握钉力高于侧面握钉力,端面握钉力均值仅为板面握钉力的57%;导孔直径、拧入深度和螺钉种类3种因素均对棉秆重组方材端面握钉力的影响不显著,螺钉种类对侧面握钉力的影响显著,螺钉种类和拧入深度对板面握钉力的影响显著;在试验范围内,棉秆重组方材(0.75g/cm3)3个面螺钉接合的最优条件均为:选用开槽沉头木螺钉,导孔直径为3.2mm,拧入深度为24mm。在实际产品加工应用中,尽量避免螺钉纵向拧入,应在横纹方向拧入;选择螺距较小、牙顶较宽的螺钉类型,适当减小导孔直径及增大螺钉拧入深度的方法可提高棉秆重组方材家具的螺钉接合强度。

Reconstituted square lumber （RSL） made from cotton stalk is a new type of wood substitute material. The effects of bolt category, diameter of guiding bore and screwing depth on RSL made from cotton stalk （end face,board side,board face） were investigated by orthogonal test. The results showed that the nail and screw holding power of board face was well above the board side, nail and screw holding power of end face was only 56% of board face. Bolt category, diameter of guiding bore and screwing depth had no significant effect on nail and screw holding power of end face. Bolt category had significant effect on nail and screw holding power of board side. Nail and screw holding power of board face was significantly affect- ed by bolt category and screwing depth. Within the range of experiment, the optimal combination of screw structure of RSL made from cotton stalk （0.75 g/era3） was bolt category （slotted countersink head wood screws） ,diameter of guiding bore （3.2 ram） and screwing depth （24 ram）. During the machining process- ing,the direction of screw-in should be perpendicular to grain. Bolt joint strength of RSL made from cotton stalk the cross grain rather than parallel to the rift for furniture could increase usage by using holt with smaller pitch and wider tooth to decrease guiding bore as well as to increase of screwing depth.