压实式造型机利用气压或液压通过压头或模样对砂箱内的型砂施加压力来紧实型砂。其压强一般为0.25～0.4兆帕。这种造型机﹐使远离施压面的砂型紧实度差。20世纪50年代初出现了高压造型机﹐砂型平面上的压强在 0.7兆帕以上。高压造型机的压头分为平压头﹑成形压头和多触头压头等几种结构形式。其中以高压多触头造型机应用最为广泛。高压多触头造型机压头分割成许多可上下运动的小方块──触头﹐通过液压缸可获得很大的压实力。压实时﹐各触头按其下面的模样高度(即受压砂层厚度)施加相应的压力﹐使砂型获得很高的﹑均匀的紧实度和硬度。这类造型机都设有微震震击机构﹐能够适应复杂模样的造型。高压多触头造型机多采用四立柱结构﹐有单工位式和双工位式。为了适应中小批量铸件的生产﹐这种造型机多附有模板快换装置﹐更换模板时﹐造型机不必停机。采用高压多触头造型﹐砂型铸造能浇出薄壁﹑尺寸精确﹑表面光洁的铸件。
The compaction molding machine uses air or hydraulic pressure to apply pressure to the molding sand in the sand box through the indenter or pattern to compact the molding sand. Its pressure is generally zero point two five ~ Zero point four Megapascals. This kind of molding machine makes the sand mold far away from the pressure surface have poor compactness. In the early 1950s, a high-pressure molding machine appeared, and the pressure on the sand mold plane was Zero point seven More than megapascals. The head of high pressure molding machine is divided into flat head, forming head and multi contact head. Among them, the high-voltage multi contact molding machine is the most widely used. The press head of high pressure multi contact molding machine is divided into many small blocks that can move up and down - the contact, and a large compaction force can be obtained through the hydraulic cylinder. During compaction, the corresponding pressure is applied to each contact according to the pattern height (i.e. the thickness of the sand layer under pressure), so that the sand mold can obtain a high and even compactness and hardness. This kind of molding machines are equipped with micro shock mechanism, which can adapt to the shape of complex patterns. The high-voltage multi contact molding machine adopts four column structure, including single station type and double station type. In order to adapt to the production of small and medium-sized castings, this kind of molding machine is often attached with a quick change device of the template. When changing the template, the molding machine does not need to stop. With high pressure and multi contact molding, sand casting can cast thin-walled, precise size and smooth surface castings.