Method and apparatus for manufacturing an assembly

Abstract

Method for manufacturing an assembly from a plurality of components, wherein In a first step, one of the components is manufactured, In a second step, the last manufactured component is measured to obtain measurement results, wherein the last manufactured component is the component manufactured in the first step, if the second step is carried out for the first time and in later versions of the second step the last manufactured component is a component manufactured in the fourth step yet to be described, and thus later. In a third step, at least one of the components not yet manufactured, which in the finished assembly is toleranced to at least one previously manufactured component, is selected as the next component to be manufactured, and at least one manufacturing dimension and at least one tolerance of at least the next component to be manufactured is determined using the measurement results obtained in the last preceding second step. In a fourth step, the next component to be manufactured is produced with at least one manufacturing dimension and at least one tolerance defined in the third step. and the second, third and fourth steps are repeated until the majority of components have been manufactured, and the assembly is put together from the components.

Claims

[1] Method for producing an assembly from a plurality of components, wherein In a first step, a first of the components is manufactured, in a second step, the last-manufactured component is measured to obtain measurement results, whereby the last-manufactured component is the component manufactured in the first step when the second step is carried out for the first time and in later executions of the second step, the last-manufactured component is a component manufactured in the fourth step to be described and thus later, in a third step, at least one of the components not yet manufactured, which in the finished assembly has a tolerance to at least one previously manufactured component, is selected as the next component to be manufactured, and at least one manufacturing dimension and at least one tolerance of at least the next component to be manufactured are determined using the measurement results obtained in the last previous second step, in a fourth step, the component to be manufactured next is manufactured with the at least one manufacturing dimension and the at least one tolerance specified in the third step, and the second, third and fourth steps are repeated until the majority of components are manufactured, and the assembly is assembled from the components. [2] Method according to the preceding claim, wherein the manufacturing dimension determined in the third step is a previously determined manufacturing dimension of the corresponding component, which is modified by a value calculated from the measurement result obtained in the last preceding second step and / or the tolerance determined in the third step is a previously determined tolerance of the corresponding component, which is modified by a value calculated from the measurement result obtained in the last preceding second step. [3] Method according to one of the preceding claims, wherein in the third step the at least one manufacturing dimension and / or the at least one tolerance is determined based on a predetermined distribution table. [4] Method according to one of the preceding claims, wherein the tolerance of the components is defined as the minimum dimension LLS and the maximum dimension ULS of the corresponding components. [5] Method according to the preceding claim, wherein in the third step, for at least some of the components or all of the components which together form a chain tolerance system, the minimum dimension LLS of these components i, i >1, is determined as LLSij=LLS′i(j−1)+ΔU(j−1)∗VUij fu¨ri≥j and LLSij=LLS′i(j−1) fu¨ri <j and the maximum dimension ULS of the components i, i > 1 as ULSij=ULS′i(j−1)+ΔO(j−1)∗VOij fu¨ri≥j and ULSij=ULS′i(j−1) fu¨ri <j is calculated, where j is a number of previous executions of the first and fourth steps, LLS' i(j-1) an intermediate minimum, ULS' i(j-1) an intermediate maximum, Δ U(j-1) a lower overhang, Δ 0(j-1) an upper overhang, V Uij a given lower distribution factor and V 0ijis a given upper distribution factor, where LLS′i(j−1){MuU(j−1)fu¨ri=j−1LLSij−1fu¨ri≠j−1 ULS′i(j−1)={MuO(j−1)fu¨ri=j−1ULSi(j−1)fu¨ri≠j−1 with MuU(j−1)=MP(j−1)−M(j−1) MuO(j−1)=MP(j−1)+M(j−1) where MP (j-1) a measurement result of the dimension of the component i = j obtained in the previous second step and M (j-1) a measurement inaccuracy of the measurement to obtain the measurement result MP (j-1) and where the lower and upper overhang is determined as and ΔU(j−1)=LLS∑1−LLS′∑(j−1) ΔO(j−1)=ULS∑1−ULS′∑(j−1) where LLS′∑(j−1)=∑i=1mLLS′i(j−1) and ULS′∑(j−1)=∑i=1mULS′i(j−1) where m is the number of components considered. [6] . Method according to one of the preceding claims, wherein following the third step and before carrying out the fourth step, compliance with at least one limit tolerance or general tolerance of the assembly is ensured by LLSij={Nij−BmUi if LLSij <Nij−BmUiLLSij wenn LLSij≥Nij−BmUi and ULSij={Nij−BmOi if ULSij>Nij+BmOiULSij if ULSij≤Nij+BmOi is set, whereby Bm Ui a lower limit tolerance, Bm Oi an upper limit tolerance, and No nominal size is. [7] . Method according to one of claims 1 to 6, wherein following the third step and before carrying out the fourth step, compliance with at least one limit tolerance or general tolerance of the assembly is ensured by and LLSij={Cij−BmUi if LLSij <Cij−BmUiLLSij wenn LLSij≥Cij−BmUi ULSij={Cij+BmOi if ULSij>Cij+BmOiULSij if ULSij≤Cij+BmOi is set, whereby Bm Ui a lower limit tolerance, Bm Oi an upper limit tolerance, and C is the manufacturing dimension. [8] Method according to one of the preceding claims, wherein in the third step the manufacturing dimension Cij=LLSij+ULSij2 is set. [9] Method according to one of claims 5 to 8, wherein following the third step and before carrying out the fourth step, it is checked whether LLS Σj ≥ LLS Σ1 and ULS Σj ≤ ULS Σ1 is fulfilled, with LLS∑j=∑i=1mLLSij and ULS∑j=∑i=1mULSij where m is the total number of components considered, and if the condition is not met, the procedure is aborted. [10] Method according to one of claims 4 to 6, wherein the distribution factors V Uij and V Oijin a distribution table or matrix for all components i and all first and fourth steps j. [11] Method according to one of the preceding claims, wherein in the third step the minimum dimension LLS and the maximum dimension ULS for one of the components i = b or a group of components b, which forms a fitting system with a previously manufactured component i = a or a previously manufactured group of components a, is calculated as ULSbneu=MuUa+MaxA and LLSbneu=MuOa+MinA where MaxA=ULSb−LLSa MinA=LLSb−ULSa and MuUa=MPa−Ma MuOa=MPa+Ma where MP a is a measurement result of the dimension of component a or component group a obtained in an earlier second step and M a a measurement inaccuracy of the measurement to obtain the measurement result MP a and where LLS athe minimum dimension of component a or component group a and ULS a is the maximum dimension of component a or component group a. [12] Method according to the preceding claim, wherein in the third step a new tolerance for the component b or the component group b is determined as Tb_neu=ULSbneu−LLSbneu2 and a new manufacturing dimension for the component b or the component group b is determined as Cb_neu=ULSbneu+LLSbneu2 [13] Device for producing an assembly from a plurality of components, comprising a manufacturing device for producing components of the assembly, a measuring device for measuring the manufactured components, a manufacturing dimension and tolerance setting device for determining at least one manufacturing dimension and at least one tolerance of the components to be manufactured, wherein a method according to one of the preceding claims can be carried out with the device.

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