凸轮轴的加工工艺诠释说明（Interpretation of machining process of camshaft）.docVIP

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凸轮轴的加工工艺诠释说明（Interpretation of machining process of camshaft）.doc

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凸轮轴的加工工艺诠释说明（Interpretation of machining process of camshaft）

凸轮轴的加工工艺诠释说明（Interpretation of machining process of camshaft） Material of camshaft: nodular cast iron, alloy cast iron, chilled cast iron, medium carbon steel Nodular cast iron: cast iron with spherical graphite after being treated with magnesium or magnesium alloy or other spheroidization. Graphite is spherical, which greatly reduces the separation and cusp effect of graphite on the matrix. Ductile iron has high strength, abrasion resistance, oxidation resistance, shock absorption and small notch sensitivity. Nodular iron camshaft generally used in single cylinder of internal combustion engine, such as a S195 diesel engine, do the camshaft with the nodular cast iron with QT600 3 or QT700-2, ball into level 2 (90-95% of graphite spheroidization rate) graphite particle size greater than 6. The overall hardness of camshaft Alloy cast iron: the iron water that is close to gray cast iron is added to Mn, Cr, Mo, Cu and other elements. Thus, the alloy of the pearlite forms to reduce the number of ferritic bodies. The camshaft of alloy cast iron is used for high speed camshaft. Such as the CAC480 camshaft, the overall hardness of the camshaft hb263-311. Cold cast iron: generally used for cold shock treatment of low alloy cast iron, the outer layer is the white mouth or hemp tissue, and the heart is still the ash tissue. Example: 372 camshaft. Using cold shock cast iron camshaft in dry friction or half dry friction condition, and is under the larger bending and contact stress, the strength of the material surface layer anti-wear and demanding, the heart still has a certain toughness. At present domestic cold shock cast iron used in the two main categories: cold shock cast iron chromium, molybdenum, copper and chromium, molybdenum, nickel cold cast iron, chilled layer microstructure: ledeburite + pearlite (sorbite) cold shock hardness of cast iron HRC45-52, at present, the domestic cold shock hardness of cast iron around HRC47. Medium carbon steel: generally used for large e