ISO 12180-1:2011 幾何学的製品仕様（GPS）—円筒形—パート1：円筒形の用語, 語彙とパラメーター | ページ 6

3.1.1

円筒度

円柱の性質

3.1.2

公称シリンダー

設計意図によって指定された数学的に円筒形の形状

注記 1: ISO 12180 のこの部分の目的のために、「公称円筒の形状」という用語は、直円柱の形状を意味すると理解されます (つまり、円筒軸とすべての円十字との間に直角がある) -セクション）。

3.1.3

母線平面

関連する円柱の軸を通る半平面

3.2.1

extracted surface

digital representation of the real surface

Note 1 to entry: The extraction conventions for cylindricity are given in ISO 12180-2. This extracted surface is an extracted integral feature as defined in ISO 14660-1.

3.2.2

cylindricity surface

extracted surface (type cylinder) intentionally modified by a filter

Note 1 to entry: This is the surface to which the concepts and parameters of this part of ISO 12180 can be applied.

3.2.3

local cylindricity deviation

Δ C_l

deviation of a point on a cylindricity surface from the reference cylinder, the deviation being normal to the reference cylinder

Note 1 to entry: The deviation is negative if from the reference cylinder the point lies in the direction of the material.

3.2.4

extracted generatrix line

digital representation of the line of intersection of the real surface and a generatrix plane

Note 1 to entry: The extraction conventions for cylindricity are given in ISO 12180-2. This extracted surface is an extracted integral feature as defined in ISO 14660-1.

3.2.5

generatrix profile

extracted generatrix line intentionally modified by a filter

3.2.6

local generatrix deviation

deviation of a point on a generatrix from the reference line, the deviation being normal to the reference line

Note 1 to entry: The deviation is negative if from the reference line the point lies in the direction of the material.

Note 2 to entry: This definition is similar to ISO 12780-1:2011, definition 3.2.4: local straightness deviation.

3.3.1

reference cylinder

associated cylinder fitting the cylindricity surface in accordance with specified conventions, to which the deviations from cylindrical form and the cylindricity parameters are referred

3.3.1.1

minimum zone reference cylinders

two coaxial cylinders enclosing the cylindricity surface and having the least radial separation

Note 1 to entry: The abbreviated term MZ is used to refer to minimum zone reference elements.

3.3.1.1.1

outer minimum zone reference cylinder

outer cylinder of the minimum zone reference cylinders

3.3.1.1.2

inner minimum zone reference cylinder

inner cylinder of the minimum zone reference cylinders

3.3.1.1.3

mean minimum zone reference cylinder

arithmetic mean cylinder of the minimum zone reference cylinders

3.3.1.2

least squares reference cylinder

cylinder for which the sum of the squares of the local cylindricity deviations is a minimum

Note 1 to entry: The abbreviated term LS is used to refer to least squares reference elements and the abbreviated term G (for Gaussian), is used as a prefix for parameters based on least squares reference elements.

3.3.1.3

minimum circumscribed reference cylinder

smallest possible cylinder that can be fitted around the cylindricity surface

Note 1 to entry: The abbreviated term MC is used to refer to minimum circumscribed reference elements.

3.3.1.4

maximum inscribed reference cylinder

largest possible cylinder that can be fitted within the cylindricity surface

Note 1 to entry: Cases exist where the maximum inscribed reference cylinder is not unique.

Note 2 to entry: The abbreviated term MI is used to refer to maximum inscribed reference elements.

3.3.2

associated derived axis of a cylindrical feature

axis of the reference cylinder(s)

3.4.1

generatrix wavelength

length of a generatrix divided by the number of sinusoidal undulations along that generatrix

Note 1 to entry: The number of sinusoidal undulations is not necessarily an integer.

3.5.1.1

peak-to-valley cylindricity deviation

value of the largest positive local cylindricity deviation added to the absolute value of the largest negative local cylindricity deviation

Note 1 to entry: The peak-to-valley cylindricity deviation is defined for all reference cylinders.

Note 2 to entry: The peak-to-valley cylindricity deviation is the only parameter that is defined for minimum zone, maximum inscribed and minimum circumscribed reference cylinders.

Note 3 to entry: The modifier GT is used in specifications to indicate that a form tolerance applies to the peak-to-valley deviation relative to the least squares reference element.

3.5.1.2

peak-to-reference cylindricity deviation

value of the largest positive local cylindricity deviation from the least squares reference cylinder

Note 1 to entry: The peak-to-reference cylindricity deviation is only defined for least squares reference cylinders.

Note 2 to entry: The modifier GP is used in specifications to indicate that a form tolerance applies to the peak-to-reference deviation relative to the least squares reference element.

3.5.1.3

reference-to-valley cylindricity deviation

absolute value of the largest negative local cylindricity deviation from the least squares reference cylinder

Note 1 to entry: The reference-to-valley cylindricity deviation is only defined for least squares reference cylinders.

Note 2 to entry: The modifier GV is used in specifications to indicate that a form tolerance applies to the reference-to-valley deviation relative to the least squares reference element.

3.5.1.4

root-mean-square cylindricity deviation

square root of the sum of the squares of the local cylindricity deviations from the least squares reference cylinder

Note 1 to entry: The root-mean-square cylindricity deviation is only defined for least squares reference cylinders.

Note 2 to entry: The modifier GQ is used in specifications to indicate that a form tolerance applies to the root-mean-square deviation relative to the least squares reference element.

3.5.2.1

straightness deviation of the extracted median line

diameter of the minimum circumscribed cylinder that totally encloses the extracted median line

3.5.2.2

local generatrix straightness deviation

straightness deviation value calculated from a generatrix profile obtained from an intersection of a plane through the axis of the least squares reference cylinder and the cylindrical feature within the full extent of the feature

Note 2 to entry: The absolute value | D₁ − D₂|/2 is the local cylinder taper value. This parameter is usually evaluated with a length, l , of 100 mm.

3.5.2.3

generatrix straightness deviation

largest local generatrix straightness value

3.5.2.4

local cylinder taper

half of the absolute difference in local diameter at the top and the local diameter at the bottom of the cylindrical feature of the two associated lines fitted through the two generatrix profiles obtained from an intersection of a plane through the axis of the least squares reference cylinder and the cylindrical feature within the full extent of the feature

3.5.2.5

cylinder taper

largest local cylinder taper value

Note 1 to entry: The cylinder taper is only defined for least squares reference cylinders.

3.5.2.6

local radii

radii of a reference circle associated to an extracted roundness profile whose cross-section is perpendicular to the axis of the least squares cylinder

3.5.2.7

cylinder radii peak-to-valley

largest local radii minus the smallest local radii

3.5.2.8

cylinder taper angle

angle obtained from the reference axis to an associated straight line through the local radii