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文章首先阐述了用静力触探法检测砂型紧实度沿高度分布的原理,通过试验得出探头直径及型砂性能与贯入阻力的关系,还对不同直径探头的检测准确度进行了试验。随后又在高压造型砂型上进行了贯入阻力试验。试验表明,静力触探法可用于自动检测,但要选择合适的探头形状和尺寸;在高压造型的紧实范围内,探头直径以4毫米为宜。用分型面压力传感器可以正确反映砂型表面硬度。在自制试验机上进行了砂型表面硬度的闭环控制试验。在有、无模型、不同模型高度、不同模型间距等条件下,用分型面压力传感器作为反馈信号自动控制压实压力,得到了要求的表面硬度。
The paper first describes the principle of detecting the compaction degree of sand compactness along the height by static cone method. The relationship between the probe diameter and the sand performance and the penetration resistance is obtained through experiments. The test accuracy of the probes with different diameters is also tested. Then in the high pressure modeling sand on the penetration resistance test. Tests show that the static probe method can be used for automatic detection, but to choose the right probe shape and size; in the compact shape of the high pressure, the probe diameter of 4 mm is appropriate. Parting surface pressure sensor can accurately reflect the sand surface hardness. A closed-loop control test of sand surface hardness was carried out on a self-made testing machine. With and without model, different model height, different model spacing and other conditions, the parting surface pressure sensor is used as the feedback signal to automatically control the compaction pressure, and the required surface hardness is obtained.