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钢丝切断法
[来源:http://www.gangxianwei51.com] [作者:不详] [日期:22-09-02] [浏览次数:]

钢丝切断法
Wire cutting method
这种加工方法比较简单,一般利用小直径0.4-0.8mm的冷拔钢丝为原料,’按照规定的长度把钢丝切成短纤维。用这种方法生产钢纤维的抗拉强度,远高于其它方法加工成的钢纤维,可达1000-2000MPa.
This processing method is relatively simple, generally using small diameter of 0.4-0.8mm cold-drawn steel wire as raw material,'according to the specified length of steel wire cut into short fibers. The tensile strength of steel fibers produced by this method is much higher than that of steel fibers processed by other methods, reaching 1000-2000 MPa.
加工手段可以用切刀、冲床。为了提高效率,常用旋转刀具切断。由于冷拔钢丝价格昂贵,这种方法生产的钢纤维成本较高。此法生产钢纤维的另一缺点是表面较光滑,与混凝土等基体的粘结强度较小。为了增加钢纤维与混凝土等基体的粘结强度,常常采用改变钢纤维的外形,即通过生产异形钢纤维的办法加以解决,常见的方法有三种:
Cutting tools and punching machines can be used for processing. In order to improve efficiency, rotary tools are often used to cut off. Because of the high cost of cold drawn steel wire, the cost of steel fiber produced by this method is higher. Another disadvantage of this method is that the surface of steel fibers is smooth and the bond strength between steel fibers and concrete matrix is small. In order to increase the bond strength between steel fibers and concrete, it is often used to change the shape of steel fibers, that is, to produce special-shaped steel fibers. There are three common methods:
⑴压棱法:在切断钢丝前,用进给钢丝的夹送辊在钢丝上压出棱形凹坑。
Pressing method: before cutting the steel wire, the pinch pits are pressed on the steel wire by the pinch roll of feeding wire.
⑵波形法:在切断钢丝前,用进给钢丝的夹送辊将钢丝压成波形后再切断。
Waveform method: before cutting the steel wire, the steel wire is pressed into waveforms and then cut off with the pinch roll of the feeding wire.
⑶弯钩法:在切断钢丝前,用进给钢丝的夹送辊等距离地压出弯钩状再切断
3. Crooked hook method: before cutting the steel wire, use the pinch roll of feeding wire to equip the hook to cut off the hook again.
2.薄板剪切法
2. thin plate shearing method
薄板剪切法是吧冷轧薄钢板切成钢纤维的方法,剪切前用特制的小型纵剪机将薄冷轧卷板剪成带钢卷,带钢卷的宽度和钢纤维的长度相同,然后将带钢卷连续不断地送入旋转刀具或普通冲床切断,旋转刀具的轴与薄板进给方向互相垂直。原材料一般采用退火的冷轧钢板,为提高强度也可以使用未退火的冷轧钢板。
Shear method is to cut the cold rolled sheet into steel fibers. Before shearing, the thin cold rolled sheet is cut into strip coil with a special small longitudinal shear machine. The width of strip coil is the same as the length of steel fibers. Then the strip coil is continuously fed into a rotary tool or a common punch to cut off. The axis of the rotary tool and the feeding direction of the sheet are the same. They are perpendicular to each other. Annealed cold-rolled steel sheet is generally used as raw material, and unannealed cold-rolled steel sheet can also be used to improve strength.

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