机械

urrence of failures represent safety or environmental hazards. All of this has led to an increase in the cost of maintenance. In some industries, maintenance costs represent the second highest or

直角坐标为   00s i n c o sc o s s i nx s s ey s s e      „„ ○ 1 上式即为用直角坐标表示的凸轮理论廓线的方程式。 因凸轮的实际廓线时理论廓线的等距曲线，距离等于滚子半径 rr，所以当已知理论廓线上任一点 B（ x， y）时，只要沿理论廓线在该点法线方向取距离为 rr，即得实际廓线上的相应点  ,B x y

稳，减少震动冲击和噪音，宜将带传动布置在高速级，从而可利用传动带的弹性吸振、打滑，防止过载时损坏基它零件。 链传动冲击、振动大，宜布置于中、低速膜的形成，从而提高蜗杆传动的效率。 (5) 蜗杆传动宜布置在高速级，以便提高齿面的相对滑动速度，有利于液体动力润滑油膜的形成，从而提高蜗杆传动的效率。 (6) 为 了减少能耗、减轻振动，宜将转换运动形式的机构，如凸轮机构、连杆机构

求，所以应该采用组合机构。 4 2 动力源的选择 1 原动机的选择 原动机选电动机 由于平压模切机电机转速为 1450r/min, 并且电机输出功率 Pw=Pd/y, Pd=FV/1000y KW. 其中 F 为工作阻力，单位 N。 ， V为工作机线速度，单位 M/S Y 为工作机的效率。 所以根据电机转速和输出效率，应选 Y160M— 4 三项异步电动机。 额 定功率为11 KW，转速

ial cutting, but uses the cutting tool, the equipment and the cutting specifications and so on has the characteristic respectively. The lumber product machining mainly carries in each kind of

e different handling and many ports have bulk, container, dry and liquidbulk terminals. Cargo that is containerized can be loaded and unloaded in a fewer number of moves by cranes operating directly

These values represent a reduction of clearance between 33 and 10% pared to the unidirectional case. However, as can be seen from figure 8 the performance of the partialLST bidirectional bearing is

r than that of the original surface. Consequently, the spherical grinding process is an example of a smallerthebetter type problem. The S/N ratio, η, is defined by the following equation: η =−10

l design personnel through the procedure inquiry function, inquires the ponents information from the sharing database which needs, carries on the interactive technological design. Thus has

this linkage， but the procedures are also applicable to more plex linkages。 We already known that a fourbar linkage has one degree of freedom。 Are there any more that are useful to know about fourbar