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Plastic Injection Molding DEUTSCHE NORM UDC[678.5/.8].067: 001.4: 621.753.1 (J( 1> .. November 1982 .. .!i!.!/ -.., DIN .;=.0 Plastics mouldings ~ .= g~ .':!,; Tolerances and acceptance conditions for linear dimensions 16901 ->."..- o~ U ~"5 ."," Kunststoff-Forrnteile; Toleranzen und Abnahmebedingungen wr Lãngenmasse Supersedes July 1973 edition ...<11eLe"' -e....c =~~li~- As it is current practice in standards published by Me International Organization forStandardization (ISO), the comma . .... ,.0.<:1 has been used throughout as a decimal marlcer. D";'i . "'" ãj"' li-." - ..~ ..:S~ It is not possible to take the tolerances for plastics mouldings from the ISO basie tolerances, since they are correlated . .c: with the nominal dimensions on the basis of other principies. , i=~I!u -="'<li 0-De ,. Dimensions in mm -c 1: .. 111 1 General 3 Concepts ~ Deviations from the nominal dimension cannot be Moulding shrinkage VS § avoided in the fabrication of plasticsmouldings. Moulding shrinlcage means the difference between the Dimensionaldeviationsoccurrin Zg . g in the produetion dimensions of the mould Lw at (23 :!:2) °C and those ~ ;2 process may result from a number of causes: of the mould ing LF, the latter having been stored for ~ aI Dispersion in the results of the processing 16 haurs after manufacture in standard atmosphere , This is dependent on DIN 50014 - 23/50.2 and tOOnmeasuredimmediately ~ after. '-"'" ~ - uniformity of the mouldingmaterial, 5.. - the machine setting, L,,\ ~ - the mouldtemperature, VS = (1 - Lw7 .100 [%) ~ - deformation of the mould under pressure. o Radial moulding shrinkage VSR g b)Condition of mould The radial moulding shrinkage is the moulding shrinkage - manufacturingtolerances for the dimensionsof in the direction of injection. I~ the mould (seeDIN167491, .ga. - wear on the mould, Tangential moulding shrinkage VST ~ - variationsinthe positionof movablepartsoftoo The tangential moulding shrinkage is the moulding shrlnk- mould. ~o age perpendicular to the direction of injection. ~ The tolerances in this standard are specified on the basis '2 of the above considerations and a large number of Mouldingshrinkagedifference t:NS ~ measurements derived from practical applications. The mouldingshrinkagedifference is the difference 00- :x ! tween the radial aOOtangential mouldingshrinkage ~ .1VS= VSR- VST 2 Field of application - ."i For other concepts: -ã The tolerances in this standard mouldings,eompressionmouldings.injection mouldings, ~ are applicable to the dimensionsof plastics mouldings mould~g materiais,see DIN 7708 Part 1 ~ producedfromthermoplastieand thermosettingmoulding compr~ion moulding, transfer moulding, extrusion, ,~ ~ materiais by compression moulding, transfer rnoulding, injection moulding,see DIN16 7QP ! compressioninjection moulding or injection moulding; toleranc:e, deviation. general tolerance, see DIN 7182 ~ are not applicable to extrusions, blow-moulded or foamed Part 1 and DIN 7168 Part 1 mouldings, deep drawn parts, sintered parts and parts tolerances of forro and position, see DIN 7184 Part 1 produced by a ehip removal machining processo and DIN 7168 Part 2. Table .1 gives the appropriate tolerance groups to be For concepts used in too field of highpolymer materiais, applied to the various moulding materiais. see DIN7724 "'o'5'1: 14:2 .~","~ "Oc'" ~ caC.. je O.. Continued on pagas 2 to 9 ca.. ~.:: c.!! ,g.ÉO aU ;;.!! '" c.., ~ - .."c ~,f~ Beulh Verlag GmbH. Berlin 30. has exclusive sale rights for German Standards (DIN-Normen) DIN 16901 Engl. Price group 7 03.90 Sales No. 0107 Page2 DIN 16901 4 Tolerances elements of the mould, e.g. wall thickness dimensions aOObottom thlekness dlmensions or dimensions deter- The tolerances shall apply to mouldings at the time of minec:lby the shims or mould slldes. acceptance;see elause5. Note: The tolerances on these dlmensions are greater Unless otherwise agreed, a reference must be made on than those on the mould.,elated dimensions the drawlng to the acceptance coOOitions as specified indause5. because the rnovable parts of the rnould do not always reach the same final posltlon when the 4.1 G Itolerances1) mould is dosed. The numbers specifiedin table 1, column 4, refer to the When the permisslble deviatlons are enterec:l agalnst the dimension, take care to ensure that appropriate tolerance group in table 2. the dlmensions Iying in the eloslng direction of If the deviationsare not speeifiedagainstthe number for the mould ali vary in the same dlrection, I.e. that thedimension inproductiondocuments, order documents, the bottom thickness for example increases when ete. a note must be ineludedreferringto this staOOard, the overall height of the moulding inereases. by specifyingDIN16901 8ndthe tolerancegroup given in table 2. For non-mould.,elated dimensions in the direction of elosing of the mould, the values speclfied in table 2 can Examplefor specifyingtolerance group 140: be increased If necessary in the case of compression Tolerances DIN 16901 -140 moulding. In sueh a case the dimensions shall be marked with these increased tolerances. 4.2 Deviationa specified against dimensions 2) .. In table 1, columns 5 aOO6, two series are given for -______n specifying tolerances &gainstdimensions. The figures in these refer to the appropriate tolerance group in table 2. I I "-' Series 1 tolerances can be complied with without special I measures. Series 2 tolerances require more extensiva measures in production. I The serias 1 aOO2 tolerances shall be divided into upper i + and lower deviations in accordance with technical require- 1// /' /' ments. I/'/ Example showing division of tolerance 0,8: +O0.8 or - 0.8O or -,+ O 4 or -+ 0.20.6 or -+ 0.50.3 ete . Note: If it is required that the tolerances be maintained Figure 1. Mould.,elateddimensions in respect of effects acting on the moulding from 4.5 Reduction01tolerances the environment or caused by the coOOition of For particulardimenslonstolerances narrowerthan those the moulding during the production process3), specifled in table 2 may be obtainable by specialme8- this shall be expressly agreed between the supplier sures. aOOthe CUStomeraOOspecified in drawings, order documents, ete. For precisionenglneeringat the present time the last two linesin table 2 applv. 4.3 Dimensionsrelated to the mould (seefigure 1) Dimensionsin table 2 related to the mould are in each 1) Formerly designated as: "Dlmensions without speci. casedimensionsin the same part of the mould. fled toleranceH " 2. Formerly designated as: "Oimensions wlth specified '--" 4.4 Dimensionsnot related to the mould (seefigure 2) tolerance" DimensionsIn table 2 not related to the mould are 3) These could be for example, temperature, atmospheric dimenslonsdetermlned by the interaction of movable humidity, gases aOOvapours, liquids ! i o +io .~ Õ ---- Directionof rnovementof mould slide Figure2. Non-mould-relateddimensions DIN 16901 Page3 4.6 Drafts 4.7 Tolerances of form anel posmon Since ali deviations apply to the nominal dimensions Deviations of form and position occurring after removal entered on the drawing.the drawing must clearlyshow from the mould are dependent on the shape of the mould the poiol on the draft taper to which the nominal among other things. dimensionapplies. Angular tolerances. tolerances of form aOOposition shall be specified in accordance with DIN 7184 Part 1 directly against the dimension or (where applicable} as general tolerances in accordancewlth DIN 7168 Part 1 and Part2. - I-- Example showing method of specifying general tolerance: i Angular tolerances. tolerances of form aOOposition DlN 7168 - mT __a 4.8 Tolerancesforparts produced by Figure3. Basieshapeof moulding chip removalmachiningprocesses For parts produced by chip removalmachiningprocesses. DIN7160. DIN 7161 aOODlN 7172 Part 1 appty. 4.9 Toterancesfor threads The followingshallbe usecJas a guideline:tolerance class i "coarse" for metric threads in accordancewith DIN 13 Part 14 and tolerance ctass"B" for pipe threads in accord- a ance with DIN ISO228 Part ,. Figure4. Plusvariation for draft Extra material comparedwith the basicshape 5 Acceptance conditions of the moulding Acceptance shal! not take place eartier than 16 hours after manufactureof the plasticsmouldingor after any required post-mouldingtreatment. The atmosphere used for acceptance shal!be staOOard atmosphere DIN50014 - 23/50-2.Forother temper- atures aOOrelativehumidities. the rneasuredvaluesmust j be corrected by taking into account the appropriate coefficientsof linearexpansion. Post-mouldingtreatrnent (coooitioningor heat treatment} shallbe agreedbetween the supplierand the cUstorner. Figure5. Minusvariation for draft For plastics parts made of mouldingmateriaisfor which Lossof material eomparedwith the basie the change in dimension - e.g. through moisture absorp- shape of the moulding tion or re-aystallization - hasto be taken into account i '" inside dimension in mekingthe measurernentsfor acceptarice,the type of post-mouldingtreatrnent must be spec:ifiedby agreement a '" outside dimension between the supplier aOOthe customer. It is advisable Too size of the required draft tapers must be speeified alsoto agreethat the specifiedtreatment coOOitionshall in the drawlng. apply also10the measurement. page4 D'IN16901 Table ,. Correlationof tolerance groupswith mouldingmateriais , 2 3 4 5 6 Moulding Tolerance groups Symbol materiais for for dimeRSions for in wherethe deviations Mouldingsmadefrom general b8sic accordence toler- are indicatedagainst material with ances the dimensioRS OIN Serias1 Series2 EP Epoxy resinmouldlngmateriais
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