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电火花线切割机随着钼丝的一次换向，切割面产生一次凸凹，在切割面上出现富于规律的搓板状，通常直称为“搓板纹”。如果不仅仅是黑白颜色的换向条纹，产生有凸凹尺寸差异，这是不能允许的。应在如下几处找原因：
Electric spark wire cutting machine with a reversing molybdenum wire cutting surface, a concave, rich of washboard appear in a cutting plane, usually referred to as "washboard straight lines". If it is not only the reversing stripes of black and white color, there is a convex concave dimension difference, which is not allowed. The following reasons should be found.
1丝松或丝筒两端丝松紧有明显差异，这造成了运行中的丝大幅抖摆，换向瞬间明显的挠性弯曲。也必然出现超进给和短路停进给。
There are obvious differences between the 1 wires and the ends of the silk, which causes the large shakes in the operation and the flexible bending at the moment of change. It is also inevitable that super feed and short circuit stop feed.
2导轮轴承运转不够灵活、不够平稳，造成正反转时阻力不一致或是轴向窜动。
The 2 guide wheel bearing is not flexible enough and is not smooth enough to cause inconsistency of resistance or axial movement in positive and reverse direction.
3导电块或一个导轮对丝的阻力太大，造成丝在工作区内正反张力出现严重差异。（两工作导轮间称工作区）。
3 the resistance of the conductive block or a guide wheel to the wire is too large, which causes the serious difference between the positive and negative tension in the working area. (two the work zone is called the working area).
4导轮或是丝架造成的导轮工作位置不正，V型面不对称，两V型延长线的分离或交叉。
The working position of the guide wheel is not correct, the V face is asymmetrical, the two V type extension line is separated or crossed by the 4 guide wheel or the silk frame.
5与走丝换向相关的进给不匀造成的超前或滞后会在斜线和圆弧上形成台阶状，也类似搓板纹。
5 associated with the wire feed reversing unevenness caused by lead or lag will be formed in the slash and stepped on the arc, similar washboard pattern.
6“皮带效应”使运转的丝每换向一次，就完成了一次处于“轮前或轮后”的一次交替，“松紧交替”是一条搓板纹的基本成因。
6 "belt effect" to the operation of each wire for the first, the completion of a "in an alternating round before or round", "an alternate" is the fundamental cause of a washboard pattern.
凡出现搓板纹，一个最主要原因是丝在工作区（两导轮间称工作区）上下走的不是一条道，两条道的差值就造成了搓板凸凹的幅度，机械原因是搓板纹的根本。导轮，轴承，导电块和丝运行轨迹是主要成因。进给不匀造成的超前或滞后当然也是成因之一。
Where the washboard pattern, one of the main reasons is the wire in the work area (two guide said work area) on the go is not a road, two road, the difference will cause the magnitude of mechanical punch washboard, the reason is the basic pattern of the washboard. The main causes are the guide wheel, the bearing, the conductive block and the track of the wire. The advance or lag caused by the unevenness of feed is also one of the causes.
还有一种搓板纹，它的周期规律不是按钼丝换向的，而是以X、Y丝杠的周期变化，成因是丝杠推动拖板运动的那个台阶或轴承运转不够稳定产生了端面跳动，或是间隙较大，存有异物出现了端面跳动的那种效果。
There is also a washboard pattern, it is not according to the cycle of molybdenum wire reversing, but by the periodic change of X, Y screw, screw drive causes is the steps or the operation of the bearing carriage movement is not stable produce ending beat, or a large gap, there are foreign bodies appeared that the end face runout.
总之，只要证实是以丝杠的周期而变化的切割缺陷，就应到那里去找一找原因。断定这一成因的最好的办法是切450斜线，其周期和造成缺陷的原因可一目了然。
In a word, as long as it is proved that the cutting defect is changed with the cycle of the screw, we should go there to find a reason. The best way to determine this cause is to cut the 450 slash, the cycle and the cause of the defect can be clear at a glance.
搓板纹造成光洁度差仅是其一，同时带来效率变低，频繁短路开路会断丝，瞬间的超进给会使短路短得很死以至停止加工。
The washboard pattern caused by poor finish is only one, at the same time bring low efficiency, frequent short circuit will open broken wire, instant super feed will make short very dead and stop processing.