日本Yamashina公司開賣新的高強度鋁自攻螺絲

　　日本工業螺絲制造商Yamashina公司開賣新的高強度鋁自攻螺絲，可鉆入軟樹脂和含有50%PPS或玻璃纖維的硬質工程塑膠，應用相當廣泛。

　　一般市面的自攻螺絲，是在目標物上的導孔沒有母螺紋的狀態下，用來鉆入目標物。這么做是因為能省略另外再鉆出母螺紋的程序，才能降低總成本，讓螺絲跟目標物的接合度提高，使產生的摩擦抵抗力讓螺絲在軸力不幸降低時能有時間上的緩沖。另一方面，一般的鋁制螺絲由于重量輕且材質上比鐵還要軟，當它被當作攻螺絲來使用時，螺紋可能會變形導致無法緊固。尤其它不能使用于含有玻璃纖維的硬質工程塑膠。

　　這次Yamashina公司研發的鋁自攻螺絲採用了新開發的螺紋形狀和獲得專利的特殊陽極酸化處理技術，從而能應用到軟樹脂和含有50%PPS或玻璃纖維的硬質工程塑膠。它的優點包括:

　　1.降低成本，防止螺絲脫落

　　2.熱膨脹度接近鐵制螺絲，防止溫度變化產生的螺絲脫落

　　3.因為是鋁制的材質所以不會影響到磁力線。可回收。可用于汽車、機械、醫療機械

　　4. 非對稱的銳角螺紋讓攻入的作業更容易;螺紋不會被施加于承座面側邊的力量損壞到

　　5.特殊陽極化處理技術讓硬質特殊皮膜的量產能夠實現。在軟質的鋁制螺絲表面生成硬度達Hv350的特殊皮膜，讓軟質的鋁制螺絲能攻入目標物

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　　Japanese Yamashina Releases New High Strength Aluminum Tapping Screw

　　Yamashina Corporation, the Japanese industrial screw maker, rolled out its new high strength aluminum tapping screw that can tap a wide range of materials including soft resin as well as hard engineered plastic with 50% PPS or glass fiber.

　　Common tapping screws available on the market have to tap the target object on condition that the pilot hole on the object has no female threads. This will save total costs by eliminating the need for pre-drilling, improve connectivity between the screw and target object, and create frictional resistance to allow for buffer time in case of axial force decrease. As for common aluminum screws, they are light and softer than iron, so they may deform fail to fasten when used as a tapping screw. They cannot be used especially with hard engineered plastic with 50% PPS or glass fiber.

　　Yamashina's new aluminum tapping screw utilizes self-developed thread shape and patented special anodic oxidation processing technology and therefore can apply to soft resin as well as hard engineered plastic with 50% PPS or glass fiber. Its advantages are:

　　1. Reduced cost. Preventing screw fall-out.

　　2. Thermal expansion rate close to iron screws, preventing screw fall-out caused by thermal change.

　　3. Aluminum composition does not affect magnetic lines of force. Recyclable. Apllicable to cars, machines, and medical equipment.

　　4. Asymmetric and acute-angle thread design makes tapping easier. The threads will not be harmed by the force applied on the flank of the bearing surface.