利用重力来紧实砂箱中型砂的尝试50年前就有了。20世纪初,在美国已经创造了这样的机器,型砂用提升机升高4米后自由下降到砂箱中;提升机料斗的长度与砂箱的宽度相适应。然而,由于操作笨重和生产率小,这些机器没有得到广泛的应用。从那时起直至1961年止,文献中找不到有关利用型砂自由下落能量来紧实铸型或型芯的新方法的任何资料。1961年,提出了一种最大限度利用重力来紧实砂箱中型砂的新方法。该方法的实质在 The use of gravity to tighten sandbox sand trial 50 years ago. At the beginning of the 20th century, such a machine had been created in the United States. The sand riser lowered freely 4 m to the flask after it was raised; the length of the elevator hopper was adapted to the width of the flask. However, these machines are not widely used due to the cumbersome operation and low productivity. From that time until 1961, no information was found in the literature on a new method of utilizing the free fall energy of the sand to compact the mold or core. In 1961, a new method of maximizing the use of gravity to tighten sandbox sand was proposed. The essence of this method is