{"id":1979,"date":"2023-07-06T17:19:33","date_gmt":"2023-07-06T15:19:33","guid":{"rendered":"https:\/\/mnwell.com\/?p=1979"},"modified":"2023-07-06T17:22:23","modified_gmt":"2023-07-06T15:22:23","slug":"nine-common-defects-and-prevention-schemes-of-low-pressure-die-casting","status":"publish","type":"post","link":"https:\/\/mnwell.com\/ja\/nine-common-defects-and-prevention-schemes-of-low-pressure-die-casting\/","title":{"rendered":"\u4f4e\u5727\u30c0\u30a4\u30ab\u30b9\u30c8\u92f3\u9020\u306b\u3088\u304f\u3042\u308b9\u3064\u306e\u6b20\u9665\u3068\u9632\u6b62\u7b56"},"content":{"rendered":"
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\u91d1\u578b\u306e\u9806\u6b21\u51dd\u56fa\u3067\u767a\u751f\u3059\u308b\u5f15\u3051\u5de3\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u9664\u53bb\u65b9\u6cd5\u304c\u3042\u308b\u3002 <\/p>\n\n\n\n <\/p>\n\n\n\n \u4f4e\u5727\u92f3\u9020\u92f3\u7269\u306b\u306f\u9178\u5316\u30b9\u30e9\u30b0\u4ecb\u5728\u7269\u304c\u3057\u3070\u3057\u3070\u51fa\u73fe\u3059\u308b\u3002\u9178\u5316\u30b9\u30e9\u30b0\u306e\u767a\u751f\u6e90\u3092\u5206\u6790\u3059\u308b\uff1a<\/p>\n\n\n\n <\/p>\n\n\n\n Cracks can be divided into hot and cold cracks. During the cooling and solidification process of liquid metal, if the stress caused by various reasons occurs shortly after the solid phase skeleton is formed, the cracks formed are called hot cracks; otherwise, they are called cold cracks. <\/p>\n\n\n\n <\/p>\n\n\n\n Sticky sand can be divided into chemical sticky sand and mechanical sticky sand, but for low-pressure casting or differential pressure casting, it is mainly mechanical sticky sand. The reason for this is that the pressure of the liquid metal increases greatly when it is under pressure, and the pressure forces the liquid metal to overcome the surface tension and penetrate into the sand core or sand mold, resulting in mechanical sand sticking. <\/p>\n\n\n\n <\/p>\n\n\n\n The causes of casting deformation are the same as those of cold cracks<\/p>\n\n\n\n The treatment of this problem is basically the same as that of cold cracking. In addition, there are some special methods: <\/p>\n\n\n\n <\/p>\n\n\n\n <\/p>\n\n\n\n Due to thermal stress deformation or other mechanical reasons (insufficient pressure of the hydraulic cylinder), the mold is not closed tightly, resulting in gaps, leaving flashes and burrs after filling.<\/p>\n\n\n\n <\/p>\n\n\n\n Air leakage, water seepage or oil seepage occurs during the air tightness test or use of castings. Some aluminum castings with high density requirements often have quality problems of pressure leakage, mostly due to defects such as pores, shrinkage, looseness, coarse structure or cracks in the castings, and there are a lot of Al2O3 in these parts. The reason is that when the aluminum liquid contacts the air during pouring, an oxide film is formed on its surface immediately, and the mixed flow that occurs due to the unsteady flow of the liquid when filling the mold will often suppress these oxide films and some cast aluminum parts that require high density. The quality problem of leakage, the main cause of leakage is micropores, microshrinkage and cracks, and there are a lot of Al2O3 in these parts. The reason is that when the aluminum liquid contacts the air during pouring, an oxide film is formed on its surface immediately, and the turbulence that occurs due to the unsteady flow of the liquid when filling the mold will mix these oxide films together with the adsorbed gas into the interior of the aluminum liquid. The relative density of these inclusions is similar to that of the aluminum liquid, and because the viscosity of the aluminum liquid increases as the temperature drops, the impurities will not have time to float out and remain inside the casting. The two adjacent oxide films provide positions and opportunities for the formation of initial cracks, and the gas precipitated during solidification and insufficient feeding will also form micro-pores and micro-shrinkage porosity in these areas. This will significantly reduce the mechanical properties of the material and become the source of pressure leakage, so the speed of liquid metal entering the cavity and the stability of liquid flow are crucial issues. It has been studied abroad that when a thin plate with a thickness of 5mm is filled at different speeds, the strength and plasticity of the resulting castings are different. Even if the filling speed is the same, the severity of the turbulence caused by the structure of the cavity is different, and the strength and plasticity of the corresponding parts are also different. Therefore, the hydraulic pressure control system has a very serious impact on the quality of complex thin-walled parts with high internal quality requirements.<\/p>","protected":false},"excerpt":{"rendered":" Low-pressure die-casting is one of the commonly used die-casting processes in aluminum alloy die-casting. Compared with high-pressure die-casting, it has the characteristics of low cost and can manufacture large parts. In low-pressure die casting, if you do not master the low-pressure die-casting technology, there will be some defects. Let’s take a look at the 9 major defects that will occur in low-pressure die-casting and how to prevent them Stomata 1.feature (1) stomata Pore-type defects formed by gas inside the casting. Its surface is generally smooth, mainly pear-shaped, round or oval. Generally not exposed on the surface of the casting, the large holes often exist in isolation, and the small holes …<\/p>\n\u30b9\u30c8\u30de\u30fc\u30bf<\/h3>\n\n\n\n
1.\u7279\u5fb4<\/h4>\n\n\n\n
(1) \u6c17\u5b54<\/h5>\n\n\n\n
(2) \u76ae\u4e0b\u6c17\u5b54<\/h5>\n\n\n\n
(3) \u30a8\u30a2\u30dd\u30b1\u30c3\u30c8\uff08\u30a8\u30a2\u30d4\u30c3\u30c8\u8868\u9762\u306e\u5b54\uff09<\/h5>\n\n\n\n
(4) \u7a7a\u6c17\u53ce\u7e2e\u7a7a\u6d1e<\/h5>\n\n\n\n
(5) \u30d4\u30f3\u30db\u30fc\u30eb<\/h5>\n\n\n\n\n
(6) \u8868\u9762\u306e\u30d4\u30f3\u30db\u30fc\u30eb<\/h5>\n\n\n\n
\u92f3\u7269\u306e\u8868\u9762\u306b\u96c6\u56e3\u3067\u5206\u5e03\u3059\u308b\u6563\u5728\u6c17\u5b54\u3002\u305d\u306e\u7279\u5fb4\u3068\u539f\u56e0\u306f\u76ae\u4e0b\u6c17\u5b54\u3068\u540c\u3058\u3067\u3001\u901a\u5e38\u92f3\u7269\u306e\u8868\u9762\u306b\u9732\u51fa\u3057\u3066\u304a\u308a\u30011\uff5e2mm\u306e\u6a5f\u68b0\u52a0\u5de5\u3067\u9664\u53bb\u3067\u304d\u308b\u3002<\/p>\n\n\n\n
(7) \u30c1\u30e7\u30fc\u30af\u30d5\u30a1\u30a4\u30a2\uff08\u30c1\u30e7\u30fc\u30af\u30db\u30fc\u30eb\uff09<\/h5>\n\n\n\n
\u6ce8\u6e6f\u6642\u306b\u767a\u751f\u3059\u308b\u591a\u91cf\u306e\u30ac\u30b9\u304c\u5186\u6ed1\u306b\u6392\u51fa\u3055\u308c\u305a\u3001\u6eb6\u6e6f\u4e2d\u3067\u6cb8\u9a30\u304c\u767a\u751f\u3057\u3001\u92f3\u7269\u5185\u306b\u591a\u6570\u306e\u6c17\u5b54\u304c\u767a\u751f\u3057\u3001\u3055\u3089\u306b\u306f\u4e0d\u5b8c\u5168\u92f3\u9020\u6b20\u9665\u304c\u767a\u751f\u3059\u308b\u3002<\/p>\n\n\n\n2.\u6c17\u5b54\u306e\u5206\u985e<\/h4>\n\n\n\n
(1) \u6790\u51fa\u5b54<\/h5>\n\n\n\n
\u3053\u306e\u7a2e\u306e\u6c17\u5b54\u306f\u3001\u30b2\u30fc\u30c8\u3001\u30e9\u30a4\u30b6\u30fc\u3001\u30db\u30c3\u30c8\u30b8\u30e7\u30a4\u30f3\u30c8\u306a\u3069\u306e\u8fd1\u304f\u306e\u9ad8\u6e29\u9818\u57df\u306b\u5747\u7b49\u306b\u5206\u5e03\u3057\u3066\u3044\u308b\u3002\u6c17\u5b54\u306f\u5c0f\u3055\u304f\u6563\u5728\u3057\u3001\u53ce\u7e2e\u7a7a\u6d1e\u3068\u5171\u5b58\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u6790\u51fa\uff1a\u3059\u306a\u308f\u3061\u3001\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u6c34\u306b\u30ac\u30b9\u304c\u542b\u307e\u308c\u3066\u304a\u308a\u3001\u51dd\u56fa\u904e\u7a0b\u3067\u5b8c\u5168\u306b\u9664\u53bb\u3055\u308c\u305a\u306b\u6790\u51fa\u3059\u308b\u3002<\/p>\n\n\n\n
(2) \u53cd\u5fdc\u6027\u7d30\u5b54<\/h5>\n\n\n\n(3) \u4fb5\u5165\u6027\u6c17\u5b54<\/h5>\n\n\n\n
3.\u6c17\u5b54\u5f62\u6210\u30e1\u30ab\u30cb\u30ba\u30e0<\/h4>\n\n\n\n
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4.\u4e88\u9632\u7b56<\/h4>\n\n\n\n
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\u53ce\u7e2e\u3068\u591a\u5b54\u6027<\/h3>\n\n\n\n
\u53ce\u7e2e\u6b20\u9665\uff1a\u91d1\u5c5e\u304c\u51dd\u56fa\u3057\u3066\u53ce\u7e2e\u3059\u308b\u969b\u3001\u6eb6\u878d\u91d1\u5c5e\u304c\u92f3\u7269\u306b\u52b9\u679c\u7684\u306b\u4f9b\u7d66\u3055\u308c\u306a\u3044\u305f\u3081\u306b\u767a\u751f\u3059\u308b\u6b20\u9665\u3002\u5f15\u3051\u5de3\u3001\u5f15\u3051\u5de3\u3001\u5f15\u3051\u5de3\u3001\u9665\u6ca1\u306a\u3069\u304c\u3042\u308b\u3002 <\/p>\n\n\n\n1.\u7279\u5fb4<\/h4>\n\n\n\n
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2.\u539f\u56e0<\/h4>\n\n\n\n
\u4e00\u822c\u7684\u306a\u91cd\u529b\u92f3\u9020\u3068\u7570\u306a\u308a\u3001\u4f4e\u5727\u92f3\u9020\u306f\u4e0b\u304b\u3089\u4e0a\u3078\u5145\u586b\u3057\u3001\u6e6f\u53e3\u306f\u4e00\u756a\u4e0b\u306b\u3042\u308b\u3002\u92f3\u7269\u306b\u5341\u5206\u306a\u5f15\u3051\u5de3\u3092\u4f5c\u308b\u305f\u3081\u306b\u306f\u3001\u4e0a\u304b\u3089\u4e0b\u3078\u9806\u6b21\u51dd\u56fa\u3001\u3064\u307e\u308a\u6e6f\u9053\u304b\u3089\u9060\u3044\u3068\u3053\u308d\u3092\u5148\u306b\u51dd\u56fa\u3055\u305b\u3001\u6e6f\u9053\u304b\u3089\u9060\u3044\u3068\u3053\u308d\u3092\u6700\u5f8c\u306b\u51dd\u56fa\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u305d\u3046\u3057\u306a\u3044\u3068\u5f15\u3051\u5de3\u3084\u5f15\u3051\u5de3\u6b20\u9665\u304c\u767a\u751f\u3059\u308b\u3002<\/p>\n\n\n\n3.\u4e88\u9632\u63aa\u7f6e\uff08\u540c\u6642\u51dd\u56fa\u307e\u305f\u306f\u9806\u6b21\u51dd\u56fa\uff09<\/h3>\n\n\n\n
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5.\u91d1\u578b\u6e29\u5ea6\u3001\u5145\u586b\u901f\u5ea6\u3001\u6ce8\u6e6f\u6e29\u5ea6\u306a\u3069\u306e\u52a0\u5de5\u65b9\u6cd5\u306f\u3001\u9010\u6b21\u51dd\u56fa\u3068\u306f\u9006\u3067\u3042\u308b\u3002<\/h4>\n\n\n\n
\u7802\u578b\u306f\u92f3\u9020\u5de5\u7a0b\u3092\u5909\u3048\u305f\u307b\u3046\u304c\u4fbf\u5229\u306a\u306e\u3067\u3001\u540c\u6642\u51dd\u56fa\u3067\u3082\u9806\u6b21\u51dd\u56fa\u3067\u3082\u3001\u5f15\u3051\u5de3\u3092\u306a\u304f\u3059\u65b9\u6cd5\u306f\u3044\u308d\u3044\u308d\u3042\u308b\u3002<\/p>\n\n\n\n
\u5177\u4f53\u7684\u306a\u4e88\u9632\u7b56\u306f\u4ee5\u4e0b\u306e\u901a\u308a\uff1a<\/p>\n\n\n\n\n
<\/figure>\n\n\n\n
\u30a4\u30f3\u30af\u30eb\u30fc\u30b8\u30e7\u30f3<\/h3>\n\n\n\n
1.\u7279\u5fb4<\/h4>\n\n\n\n
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2.\u539f\u56e0<\/h4>\n\n\n\n
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3.Prevention<\/h4>\n\n\n\n
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Cold insulation and insufficient watering<\/h3>\n\n\n\n
1.Feature<\/h4>\n\n\n\n
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2.Causes of formation (fluidity, exhaust)<\/h4>\n\n\n\n
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3.Preventive measures (fluidity, exhaust)<\/h4>\n\n\n\n
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<\/figure>\n\n\n\n
Cracks<\/h3>\n\n\n\n
1.Cause of formation<\/h4>\n\n\n\n
2.Prevention method<\/h4>\n\n\n\n
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sticky sand<\/h3>\n\n\n\n
1.Cause of formation<\/h4>\n\n\n\n
2.Prevention method<\/h4>\n\n\n\n
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deformation<\/h3>\n\n\n\n
1.Cause of formation<\/h4>\n\n\n\n
2.Prevention method<\/h4>\n\n\n\n
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flash, burr<\/h3>\n\n\n\n
1.Causes of flash burr formation<\/h4>\n\n\n\n
2.Prevention method<\/h4>\n\n\n\n
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leak<\/h3>\n\n\n\n