ISO 230-3:2020 工作機械のテストコード—パート3：熱効果の決定 | ページ 6

3.1

machine scale

measurement system integrated into a machine providing the linear or rotary position of the machine’s axis

3.2

coefficient of thermal expansion

α

ratio of the fractional change of length to the change in temperature

[SOURCE: ISO/TR 16015:2003, 3.1.1, modified — Note 1 to entry has been changed and the where clause has been added.]

3.3

nominal coefficient of thermal expansion

α_n

approximate value for the coefficient of thermal expansion (3.2) over a range of temperature from 20 °C to T

3.4

uncertainty of coefficient of thermal expansion

u_α

parameter that characterizes the dispersion of the values that can reasonably be attributed to the coefficient of thermal expansion (3.2)

3.5

thermal expansion

Δ_E

change in the length of a measured object or a portion of the scale of a length test equipment in response to a temperature change

3.6

nominal thermal expansion

Δ_ne

estimate of the thermal expansion (3.5) of a measured object or a portion of the scale of a length test equipment from 20 °C to their average temperatures at the time of measurement

3.7

uncertainty in nominal thermal expansion due to uncertainty in α

u_Δ,NE

uncertainty in the nominal thermal expansion (3.6) arising from uncertainty of coefficient of thermal expansion (3.4)

3.8

uncertainty of length due to temperature measurement

u_TM

uncertainty in a measured length due to the uncertainty of the temperature at which the length measurement was conducted

3.9

nominal differential thermal expansion

NDE

difference between the estimated expansion of a measured object and that of the test equipment owing to their temperatures deviating from 20 °C

3.10

uncertainty of nominal differential thermal expansion

u_NDE

combined uncertainty caused by the uncertainties of thermal expansion (3.5) of the measured object and that of the test equipment

Note 2 to entry: For evaluation of uncertainty see ISO/TR 16015:2003, 5.3.

3.11

environmental temperature variation error

E_TVE

estimate of the maximum possible measurement variation induced solely by the variation of the environment temperature during any time period while performance measurements are carried out on a machine tool

3.12

uncertainty due to environmental temperature variation error

u_ETVE

standard measurement uncertainty contribution in performance measurements carried out on a machine tool caused by the effects of environmental temperature changes

Note 2 to entry: The basis for the estimation of this uncertainty for a machine tool is the environment test according to Clause 5.

3.13

combined standard thermal uncertainty

u_CT

combined uncertainty in length measurements caused by an environment with a temperature other than a constant and uniform 20 °C

Note 1 to entry: This term is equivalent to combined standard dimensional uncertainty due to thermal effects as defined in ISO/TR 16015.

Note 3 to entry: A detailed description of estimating the combined standard thermal uncertainty is given in ISO/TR 16015.

3.14

thermal distortion of moving rotary component

d(E_αOβ)_xx,t

range of linear or angular displacement of moving rotary component along rotary axis β or of axis average line of spindle β in the direction of α within (the first) t min of the tests (at position xx)

Note 1 to entry: Possible notations for α are: X, Y, Z, A, B, C. Possible notations for β are: C, C1, A, B, or any spindle axis. Possible notations for xx are: P1 (position P1, away from the spindle nose) and P2 (position P2, close to spindle nose); position reference xx is omitted for values of linear displacement in the Z direction and angular displacements (A, B, and C).

Note 2 to entry: For notation E_αOβ, see ISO 230-7.

Note 3 to entry:d(E_ROT) is a special case of this thermal distortion indicating radial expansion of the rotary component T. Similarly, d(E_ZOT) is the thermal growth of the rotary component rotating around C in the axial direction.

3.15

thermal distortion of moving linear component

d(E_{α γ})_xx,t

range of linear or angular displacement, in the direction of α, of moved machine component along linear axis γ within (the first) t min of the tests for thermal distortion caused by moving linear axis (at position xx)

Note 1 to entry: Possible notations for α are: X, Y, Z, A, B, C. Possible notations for γ are: X, X1, Y, Z, W or any linear axis. Possible notations for xx are: P1 and P2, xx can also be expressed in words, e.g. left and right.