铸铁平板和铸铁平台的误差评定条件
时间：2016/1/9 15:19:48
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1、最小条件原则用两个平行的抱负平面包涵现实外貌，并使两抱负平面间的间隔为最小，此最小间隔为平面度偏差值。
2、贴切原则用一个抱负平面与现实外貌相切，且与现实外貌之间的最大间隔为最小，此间隔为平面度值
3、最小二乘方原则将一个抱负平面按现实外貌的趋势，置于现实外貌的中部，并使现实外貌上各点到抱负平面的间隔平方和为最小，以这个最小二乘方中央平面作为评定基面，各测点对此平面偏差中最大值与最小值之差为被测外貌平面度偏差值。
4、铸铁平台对角线原则以通过被测外貌的一条对角线而平行于另一条对角线的平面作为评定基面，各测点对此平面偏差中最大值与最小值之差为被测面平面度偏差值。
5、环线法原则利用丈量闭合环的平差原理，使各被测点平差后的新位置到丈量基面的间隔变为各点相对付抱负平面的间隔。这时抱负平面便是通过原点的天然程度面。
6、三点法原则划定抱负平面通过现实外貌上相距最远且不在一条直线上的三点形成的平面为评定基面，以各测点距此平面偏差中最大值与最小值之差为所求被测外貌的平面度偏差值。
7、最大直线度原则以现实外貌任一截面最大直线度偏差作为平面度偏差值。
铸铁平板和铸铁平台的局部偏差
铸铁平板(铸铁平台)的局部偏差是指平板事情面局部平面度加工质量，包罗事情面加工的微观质量和事情面小范畴内的局部畸变。所谓加工的微观质量是指加工外貌极小间距微小峰谷不屈度，即外貌粗糙度。外貌微观质量好，耐磨损，平板利用寿命高。而事情面小范畴内的局部畸变是指加工外貌不屈整、有变形。这里所说的事情面小范畴，对小平板而言是局部位置，对大平板则是局部面积。
Error evaluation conditions for cast iron
plates and cast iron platforms
1. The principle of minimum condition uses
two parallel ambition planes to cover the actual appearance and minimize the
interval between the two ambition planes. The minimum interval is the flatness
deviation value.
2, the principle of affixing is tangent to
the reality of the ambition plane, and the maximum interval between the actual
appearance and the actual appearance is the minimum, the interval is the
flatness value
3. The principle of least squares places
the ambition plane in the middle of the actual appearance according to the
trend of the actual appearance, and minimizes the sum of the squares of the
points on the realistic appearance to the ambition plane, with the central plane
of the least squares as The base surface is evaluated, and the difference
between the maximum value and the minimum value of the plane deviation of each
measurement point is the deviation value of the measured appearance flatness.
4. The principle of the diagonal of the
cast iron platform is to evaluate the base plane by a diagonal line passing
through the diagonal of the measured appearance parallel to the other diagonal
line. The difference between the maximum and minimum valuesof the plane deviation of each measuring point is Measuring surface
flatness deviation value.
5. The principle of the loop method uses
the adjustment principle of measuring the closed loop, so that the interval
from the new position after the measurement of the measured points to the
measuring base becomes the interval of each point relative to the paying plane.
At this time, the ambition plane is the natural degree of the origin.
6. The principle of three-point method
delimits the ambition plane from the plane formed by the three points which are
farthest apart from each other on the real appearance and not on a straight
line, and the difference between the maximum value and the minimum value of
each measurement point from the plane deviation is The flatness deviation value
of the measured appearance.
7. The principle of maximum straightness is
the deviation of the maximum straightness of any section of the actual
appearance as the deviation of the flatness.
Local deviation of cast iron plate and cast
iron platform
The local deviation of the cast iron plate
(cast iron platform) refers to the local flatness processing quality of the
flat surface, including the microscopic quality of the surface processing and
the local distortion in the small surface of the surface. The so-called
microscopic quality of processing refers to the extremely small spacing of the
processing appearance, the small peaks and valleys, the roughness, that is, the
appearance roughness. The appearance is microscopically good, wear-resistant,
and the life of the flat plate is high. The local distortion in the small
category of the object refers to the unfinished and deformed appearance of the
processing. The small area mentioned here is a local position for a small flat
plate and a partial area for a large flat plate.
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