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<table cellpadding="3" cellspacing="0" width="100%" class="forumline"> <thead> <caption><table border="0" cellspacing="0" cellpadding="0" width="100%" class="forumheader"> <tr> <td align="left" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_left.gif" width="25" height="27" alt="" /></td> <td align="center" class="forumheader-mid">Topic review</td> <td align="right" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_right.gif" width="25" height="27" alt="" /></td> </tr></table></caption> </thead> <tbody> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>lompiacv</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/AcidTechTiger/images/post_old.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Wed 1:46, 12 Jan 2011<span class="gen"> </span> Post subject: ugg italia Casting the production of steel casting</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Casting the production of steel castings and prevent hot cracking <br /> <br /> <br />, The thickness should be greater than 2mm. Figure 6 shows the rib cracking process to set an example. If you do not agree with changing the casting structure, stress relief annealing can be removed after casting process ribs. Rib craft store located 6 crack king of example Fig6Exem # eoftechnicalrib {orpreventinghottear2.7 thermal cracking of the transfer - from the application of cutting gate gating system design of gating system can be used control the solidification rate in each group element method, so that heat transfer to the crack ribs on the gate or process. Figure 7 shows the gate on the thermal cracking to the transfer of the design example. Such as self-cutting gate gating system. Also reduce the gate from the gate cutting cutting the workload, especially for the large cast steel castings can be greatly reduced casting cleaning, cutting the workload, very promotional value. Figure 7 Yu gate design from schematic Fi. 7Schemeof5tFuctu ~ rthese 【f-cut. ate Figure 7 shows the design of the structure from the signal gate cut. The figure set the gate hot in sets of 4. Thermal units with poor thermal conductivity of refractory materials by mixing silicate sand hardened steel. Overheating when the wax mold sets embedded in the pressure-type, so that hot wax sleeve and into a whole, the system shell, dewaxing, after roasting, heat set to become part of the shell. Heat transfer coefficient and heat set the heat transfer coefficient of shell ratio should be less than 0.8. Sets due to excessive heat after pouring poor thermal conductivity, heat slowly, leaving the gate of the site as \After breaking box-shaped structural damage, the stress disappears, the purpose of transfer of thermal cracking play. Own fault and because the gate to reduce casting cleaning, cutting the workload. Since the design of cutting the main gate is to calculate △, z. Where △ is the thickness of units overheating, requiring △ ≥ (1) where - within the gate of the thermal module, film sets the length of the heat can be calculated as follows z 0z ≤ 0. ll3KL ten 2M,<a href="http://www.stivaliuggitalia.org" target="_blank">ugg italia</a>, (2) where z - hot sets of long, mE, J - the gate length, mE, - near the line of steel in the solid phase thermal cracking susceptibility coefficient, for the carbon steel were taken 21 .65 MPa and 6.9MPa mouth. Drag coefficient of a shell, the water glass shell take 0.05MPa-- runner high, mEm - runner length, mm - runner cross-sectional area,<a href="http://www.stivaliuggitalia.org" target="_blank">stivali ugg</a>, rDm When these values into later, have z ≤ ‰ ten 2M (3) 3 Conclusions (1) is due to hot cracking during solidification of castings in the \(2) Select the hot cracking sensitivity of a small cast alloys; by low temperature pouring molten red shell; thin flat width of the gate casting design; to avoid the impact of pouring molten metal into the cavity of fixed sites and \gating system structure; set rib cracking processes such as process measures,<a href="http://www.stivaliuggitalia.org" target="_blank">ugg milano</a>, can effectively prevent the molten steel casting mold produces hot cracking. (3) can be transferred from the cutting gate not only to avoid hot cracking the castings have formed part of hot cracking,<a href="http://www.monclerjackens.net" target="_blank">moncler outlet</a>, and can greatly reduce the casting cleaning, cutting the workload. References 1 ['y. aeBBB. Dish nHHenp0ueccH. neHHHr mouth sister: MAI/IFI43,<a href="http://www.airjordansshoescheapnike.com" target="_blank">air jordans</a>, 1960.2pH ~ J, n. : OBAA. T ∞ p stare cKHeOCHOB ~ nHHomI '! POH3BO ~ CTBa. cBenHc {MAIIIFH3, 19613 Ⅱ PYeBcKHMA. Pac ~ leTC'aMOrlpOn3BOnbHorOOTAeaea. anHTH \; Chinese core journals, Science and Technology of China Journal of Statistics and Analysis in the United States EI database retrieval systems journals. magazine casting, forging, metal heat treatment and other thermal processing technology and information as one of the readers for casting, forging, metal heat treatment and physical and chemical detection industry management cadres, technicians and university students. 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