Nuair a gheobhaimid tacar nua demúnlaía dteastaíonn promhadh agus tástáil uathu, bíonn fonn orainn i gcónaí toradh a thriail níos luaithe agus guí ar son próiseas réidh ionas nach gcuirfear amú uaireanta oibre agus go gcruthóidh tú trioblóidí.
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Ach anseo caithfimid dhá rud a mheabhrú:
Ar dtús, déanann dearthóir múnla agus teicneoirí déantúsaíochta botúin uaireanta. Mura mbeimid ar an airdeall agus muid ag tástáil samhlacha, d’fhéadfadh go ndéanfaimis damáiste mór mar gheall ar mhionbhotúin.
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Second, the result of the model test is to ensure the smooth production in the future. & nbsp; If reasonable steps are not followed and proper records are not made in the mold test process, the smooth progress of mass production cannot be guaranteed. & nbsp; What we emphasize more is that & quot;if the mould is used smoothly, the profit recovery will be increased rapidly, otherwise the cost loss will be more than the cost of the mould itself & quot;.
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II. Réamhchúraimí roimh Thástáil Shamhail
1. Understand the relevant information of the mold:
Is fearr líníocht dearaidh an mhúnla a fháil, é a anailísiú go mion, agus teicneoir múnla a fháil chun páirt a ghlacadh sa tástáil mhúnla.
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2. First check its mechanical cooperation on the workbench:
Attention should be paid to scratch, missing parts, looseness and other phenomena, whether the movement of the die to the sliding plate is true, whether there is leakage in the water channel and air pipe joint, and whether the opening of the die is limited should also be marked on the die. & nbsp; If the above actions can be done before the die is hung, the waste of working hours caused by finding problems when the die is hung and disassembling the die can be avoided.
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3. When it is determined that all parts of the mold are acting properly, it is necessary to select a suitable test injection machine. Attention should be paid to: (a) injection capacity; & nbsp; (b) the width of the guide rod; & nbsp; (c) maximum opening distance; & nbsp; (d) accessories; & nbsp; Whether it is complete, etc. & nbsp; After everything is confirmed that there is no problem, the next step is to hang the mold. During hanging, care should be taken not to take it off before locking all the clamping plates and opening the mold, so as not to loosen or break the clamping plates and cause the mold to fall off.
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Tar éis an múnla a shuiteáil, seiceáil go cúramach an bhfuil gníomhartha meicniúla gach cuid den mhúnla, mar shampla pláta sleamhnáin, thimble, struchtúr aistarraingthe fiacail agus lasc teorann. & nbsp; Agus tabhair aird ar cibé an bhfuil an nozzle insteallta ailínithe leis an inlet beathaithe. & nbsp; Is é an chéad chéim eile aird a thabhairt ar an ngníomh deiridh múnla. Ag an am seo, ba cheart brú deiridh an mhúnla a ísliú. Le linn gníomhartha dúnta múnla luais láimhe agus íseal -, ba cheart aird a thabhairt féachaint an bhfuil aon ghníomhartha neamhshuaracha agus fuaimeanna neamhghnácha ann.
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4. Raise mold temperature:
De réir fheidhmíocht na n-amhábhar a úsáidtear sa táirge críochnaithe agus méid an mhúnla, roghnaítear rialtóir teochta múnla iomchuí chun teocht an mhúnla a ardú go dtí an teocht riachtanach le linn na táirgeachta.
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Chomh luath agus a mhéadaítear teocht an mhúnla, caithfear gníomhartha na gcodanna go léir a sheiceáil arís, toisc go bhféadfadh an cruach a bheith ina chúis le greamú múnla mar gheall ar leathnú teirmeach, mar sin caithfear aird a thabhairt ar sleamhnán na gcodanna uile chun brú agus tonnchrith a sheachaint.
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5. If there is no experimental planning rule in the factory, we suggest that only one condition can be adjusted at a time when adjusting the test conditions, so as to distinguish the influence of single condition change on the finished product.
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6. According to the different raw materials, bake the raw materials properly.
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7. Try to use the same raw materials as possible for future mass production.
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8. Do not try the mold completely with inferior materials. If you have color requirements, you can arrange the color test together.
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9. Internal stress and other problems often affect the secondary processing. After the finished product is stable after the test, the secondary processing mold shall be closed slowly. The mold closing pressure shall be adjusted and operated several times to check whether there is any phenomenon such as uneven mold closing pressure to avoid burrs and mold deformation of the finished product.
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Tar éis na céimeanna thuas a sheiceáil, déanfar luas agus brú dúnta an mhúnla a ísliú, socrófar an cnaipe sábháilteachta agus an stróc díothaithe, agus ansin coigeartófar gnáthluas dúnta agus dúnta an mhúnla. & nbsp; Má tá lasc teorann an stróc uasta i gceist, ba cheart an stróc oscailte múnla a choigeartú beagán níos giorra, agus ba cheart an gníomh oscailte múnla luais ard - a ghearradh amach roimh an stróc uasta d’oscailt an mhúnla. & nbsp; Tarlaíonn sé seo toisc go bhfuil an stróc gníomhaíochta luais ard - níos faide ná an luas íseal - amháin sa stróc oscailte múnla iomlán le linn an mhúnla a líonadh. & nbsp; Ní mór an tslat ejection meicniúil ar an meaisín plaisteach a choigeartú freisin chun gníomhú tar éis an ghnímh oscailte iomlán múnla luais - chun an pláta bioráin ejector nó an pláta stiall a chosc ó dhífhoirmiú mar gheall ar strus.
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Seiceáil na míreanna seo a leanas arís le do thoil sula ndéanfaidh tú an chéad instealladh múnla:
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(a) Cibé an bhfuil an stróc luchtaithe ró-fhada nó neamhleor.
(b) Cibé an bhfuil an brú ró-ard nó ró-íseal.
(c) Cibé an bhfuil an luas líonta ró-thapa nó ró-mhall.
(d) Cibé an bhfuil an timthriall próiseála ró-fhada nó ró-ghearr.
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D’fhonn cosc a chur ar lámhaigh ghearr, bristeadh, dífhoirmiú, burr agus fiú damáiste do mhúnla an táirge críochnaithe.
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If the processing cycle is too short, the thimble will push through the finished product or peel the ring and crush the finished product. & nbsp; This kind of situation may take you two or three hours to take out the finished product.
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Má tá an timthriall próiseála ró-fhada, féadfaidh an chuid tanaí de chroí an mhúnla briseadh mar gheall ar chrapadh an chomhdhúil rubair.
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Of course, you can & #39;t predict all the problems that may occur during the mold test, but full consideration and timely measures in advance will help you avoid serious and expensive losses.
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Trí cinn, príomhchéimeanna na tástála múnla
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D’fhonn dramhaíl ama agus trioblóidí gan ghá i olltáirgeadh a sheachaint, is gá go deimhin foighne a íoc chun dálaí próiseála éagsúla a choigeartú agus a rialú, na dálaí teochta agus brú is fearr a fháil amach, agus nósanna imeachta caighdeánacha tástála múnla a fhoirmiú, ar féidir iad a úsáid chun modhanna oibre laethúla a bhunú.
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1. Check whether the plastic material in the charging barrel is correct and whether it is baked according to regulations (different results are likely to be obtained if different raw materials are used for mold test and production).
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※. & nbsp; Test whether the temperature of the material pipe and the temperature of the mold are suitable for the processed raw materials.
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3. Adjust the pressure and injection quantity in order to produce a finished product with satisfactory appearance, but do not run burrs, especially when some cavity finished products are not completely solidified. Before adjusting various control conditions, you should think about it, because a slight change in mold filling rate may cause great mold filling changes.
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4. Fan go foighneach go dtí go gcobhsaíonn coinníollacha an mheaisín agus an mhúnla, fiú amháin i gcás meaisíní meánmhéide -, féadfaidh sé níos mó ná 30 nóiméad a thógáil. & nbsp; Is féidir an tréimhse ama seo a úsáid chun fadhbanna féideartha leis an táirge críochnaithe a sheiceáil.
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5. The advancing time of the screw cannot be shorter than the solidification time of the gate plastic, otherwise the weight of the finished product will be reduced and the performance of the finished product will be damaged. & nbsp; And when the mold is heated, the advance time of the screw also needs to be lengthened to compact the finished product.
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6. Reasonable adjustment to reduce the total processing cycle.
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7. Rith na coinníollacha nua-aistrithe ar feadh 30 nóiméad ar a laghad go dtí go mbeidh siad seasmhach, ansin dosaen táirgí patrún iomlána ar a laghad a tháirgeadh, an dáta agus an chainníocht a mharcáil ar a gcoimeádáin, agus iad a chur ar leithligh de réir na gcabhán múnla chun tástáil a dhéanamh cobhsaíocht a n-oibríochta iarbhír agus díorthaigh rialaithe réasúnta a fháil. & nbsp; (luachmhar go háirithe do mhúnlaí cuas il -).
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8. Measure and record the important dimensions of continuous samples (measure again when the samples are cooled to room temperature).
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9. When comparing the measured sizes of each pattern, attention should be paid to:
(a) an bhfuil an méid seasmhach.
(b) Cibé an bhfuil claonadh ann roinnt toisí a mhéadú nó a laghdú, ag tabhairt le fios go bhfuil na dálaí meaisínithe fós ag athrú, amhail droch-rialú teochta nó rialú brú ola.
(c) Cibé an bhfuil an t-athrú tríthoiseach laistigh den raon lamháltais.
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10. If the size of the finished product is not changed and the processing conditions are normal, it is necessary to observe whether the quality of the finished product of each mold cavity is acceptable and its size is within the allowable tolerance. & nbsp; Record the number of the measured cavities that are continuous, larger or smaller than the average value so as to check whether the size of the mold is correct.
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Déan na sonraí a thaifeadadh agus a anailísiú mar an gá atá leis na coinníollacha múnla agus táirgeachta a mhodhnú agus mar thagairt don olltáirgeadh sa todhchaí.
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1. Make the processing run longer to stabilize the melt temperature and hydraulic oil temperature.
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2. Adjust the machine conditions according to the size of all finished products that are too large or too small. If the shrinkage rate is too large and the finished products appear insufficient in shot materials, reference can also be made to increase the gate size.
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3. The size of each mold cavity is too large or too small to be corrected. If the size of the mold cavity and the door are still correct, then the machine conditions, such as mold filling rate, mold temperature and pressure of each part, should be changed and whether some mold cavities are filling slowly should be checked.
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4. according to the matching situation of the finished products of each mold cavity or the mold core displacement, the mold filling rate and mold temperature may be adjusted again to improve its uniformity.
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5. Check and modify the faults of the injection machine, such as the defects of oil pump, oil valve, temperature controller, etc., which will cause changes in processing conditions. Even the perfect mold cannot exert good working efficiency in poorly maintained machines.
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Tar éis duit na luachanna taifeadta go léir a athbhreithniú, coinnigh tacar samplaí chun a sheiceáil agus a chur i gcomparáid an bhfuil feabhas tagtha ar na samplaí ceartaithe.
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IV. Cúrsaí Tábhachtacha
Coinnigh i gceart gach taifead den iniúchadh samplach le linn an phróisis tástála múnla, lena n-áirítear brúnna éagsúla sa timthriall próiseála, gliú leá agus teocht an mhúnla, teocht an phíobáin ábhair, am gníomhaíochta insteallta, tréimhse beathaithe scriú, srl. I mbeagán focal, na sonraí go léir a chabhróidh leo ba cheart na coinníollacha próiseála céanna a bhunú go rathúil sa todhchaí chun táirgí a chomhlíonann na caighdeáin cháilíochta a fháil.
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Faoi láthair, is minic a dhéantar faillí i dteocht an mhúnla sa tástáil ar mhúnla monarchan, agus is í an rud is deacra teocht an mhúnla a mháistir le linn na tástála múnla gearrthéarmach - agus olltáirgeadh sa todhchaí. Is féidir le teocht an mhúnla mhícheart dul i bhfeidhm ar mhéid an tsampla, ar luminosity, crapadh, patrún sreafa agus ganntanas ábhair, srl. Mura n-úsáidtear rialtóir teochta an mhúnla, b’fhéidir go mbeadh sé deacair teocht an mhúnla a thuiscint le haghaidh olltáirgthe sa todhchaí.
