Disappear conveyer of scraper of modular whole casting is mid the control of groovy stoma blemish
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2 ~ 1.
5mm, breathe freely rate for 0.
415m4/Pa · Min, exhaust ability is 2.
172m3/s. The quality management of cell body coating is very crucial, because coating has quite great adherent strength, pouring when coating layer won't by interior of fluid of metal of be involved in, can adhere to thoroughly in cast appearance, when cast refrigeration comes off automatically to the coating when critical temperature cast. In mass-produced when should detect regularly coating permeability, adjust coating composition in time, eligible cast is to rely on optimal coating to assure, because this controls coating quality,not allow to ignore. 4. Control is appropriate pouring about of temperature cell body is in pouring fill model in the process, the hot action of metallic fluid suffers pouring of temperature restrict. When pouring when temperature is high, metallic fluid hot action is sufficient, the child heating up solution of about is gaseous state, it is easy to eliminate below the action of negative pressure field; When pouring when temperature is low, metallic fluid hot action is inadequate, the child heating up solution of about is liquid state, can jam coating layer air gap, the child that heat up solution eliminates suffocate suffocate, model counterpressure is formed inside antrum, fill model fluidity drops accordingly, generate stomatic odds very tall. Carry out a proof, of cell body pouring temperature summer is controlled for 1580 ℃ , winter is 1620 ℃ left and right sides. 5. Reasonable pouring of positional cell body optimal and pouring all surfaces that the position is body are filled up cheek by jowl by molding sand, pouring when obtain good aerification condition, facilitating exhaust, divide broken bits. The choice is pouring positional principle is: The face of the largest size should be in about perpendicular or tilt, stand that is to say irrigate or inclined irrigate. Because about itself is airtight, fill model when the gas that about heat separates generation and hangover must from about and fill model the clearance flank eduction between metallic fluid face, the side watch area that passes eduction is jumped over greatly more advantageous, namely the principle with the largest area of alleged side watch. When pouring after the position is firm, whether casting gives eligible cast, depend on inside of runner introduce the seat. Affirmatory inside the principle of runner position is: Fill model successful, rise equably, without blind angle, aerification is sufficient. Inside the appearance of runner should make it opens type, length is appropriate, do not produce splash, eliminate thereby cold lie between, prevent stomatic generation. 6. Reasonable pouring what speed and negative pressure spend cell body is pouring craft is with the metal fluid fills runner cup, close straight runner is criterion. If too fast or infuse rate is too slow, can make fill model the process causes intense and disorder intercurrent unripe acuteness boiling, will have not enough time the nip of about body bag of aerification is caky in metallic current form air hole. Ideal pouring speed is to give casting mould inside model, fluid displacement offers enough metallic fluid, make metallic fluid is filled model speed is equal to about aerification speed. Craft point is as follows: (1) straight runner is made hollow prevent splash when be being irrigated first, splash instead happen, straight runner is made hollow. Use first small shed metallic fluid dot to connect straight runner to flow to be full of runner cup to close quickly greatly again straight runner, maintain vacuum to spend, when sinking no longer till fluid of runner cup metal till. (2) notes aperture to adjust limitation with runner cup pouring the speed practice through ten years, we think to disappear the gating system form with modular appropriate craft is enclosed, to preventing air hole generation has better effect. Be in namely pouring fill model inside time, the metallic juice that gating system place provides and stall of about aerification disappear spend synchronism to be enclosed gating system. Be in pouring when temperature is constant, the aerification disappear stall of about spends the absorption of heat with about to concern, it is same that the stall of about aerification disappear with identical density, identical large wall is spent. Because cell body structure, wall is large evener, about absorption of heat is basic it is consistent, the size ration that so my company notes hole with runner cup is offerred fill model metallic fluid, fill aptly in order to obtain model speed. Pouring when metallic fluid fills runner cup all the time, nothing more than excessive, splatter destroy close filmy, assure field of balanced negative pressure, make the close fact of molding sand is spent be more than the molding sand shears to casting mould force, do not collapse box, ;burst;ulcerate;fester model. (3) is pouring must not break in the process flow and shine stream pouring do not allow to flow in the process, shine stream happen, once straight runner is bare,be in air, below negative pressure action air is entered model antrum forms stomatic blemish, make cast makes waste product. (4) decides reasonable vacuum spends appropriate vacuum is the exhaust, assurance that divides broken bits, also be to prevent to stick arenaceous element, equivalent vacuum is spent is to point to pouring field of the negative pressure in the process is built reasonably, make rate of air sucked in required is more than gas evolution, close solid works arenaceous, assure cast geometry dimension, shorten caky time, prevent air hole to diffuse, grown. (The cup of runner cup runner with the 5) appropriate capacity that make is to carry on the necessary tool of metallic fluid, pouring when make metallic fluid does not generate vortex flow, have the function that block broken bits, reach market of float of the impurity in metallic fluid upside of face of runner cup fluid, prevent foreign matter to fill model make air hole. 3, epilogue disappears modular whole casting is mid groovy craft is not to have surplus nearly accurate figuration, it is a collect plastic, chemical industry, mechanical, smelt and cast the much discipline system that is an organic whole project, because him level is finite, handle hope make a comment or criticism inappropriately. CNC Milling