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采用铸锻一体化成形技术制备A356铝合金汽车制动器卡钳,研究锻压变形量对卡钳的组织与力学性能的影响。结果表明,锻压变形量越大,锻压对模腔内凝固合金的强制性补缩效果越好,卡钳厚大部位的收缩裂纹越小,显微组织塑性变形越明显,卡钳的抗拉强度和伸长率越高。当变形量达到11.1%时,锻压能够完全压实愈合卡钳厚大部位的收缩裂纹,显微组织产生明显的塑性变形,枝晶晶粒破碎细化。当锻压变形量为17.3%时,锻压后卡钳的抗拉强度和伸长率分别为315.1MPa和6.4%,比未锻压卡钳的抗拉强度和伸长率分别增大了18.6%和30.6%。
A356 aluminum alloy brake caliper was prepared by casting and forging integrated forming technology to study the effect of forging deformation on the microstructure and mechanical properties of the caliper. The results show that the greater the forging deformation, the forging of the mold cavity solidified alloy mandatory re-shrinking effect is better, thicker parts of the caliper shrinkage cracks smaller, the more obvious microstructure plastic deformation, caliper tensile strength and elongation The higher the rate. When the amount of deformation reaches 11.1%, the forging can completely compress the shrinkage cracks of the thick parts of the calipers, and the plastic deformation of the microstructure is obvious. The dendrite grains are broken and refined. When the amount of forging deformation was 17.3%, the tensile strength and elongation of forging calipers were 315.1MPa and 6.4% respectively, which were increased by 18.6% and 30.6% respectively compared with those of unwrought calipers.