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利用气压或液压通过压头
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 molding sand is compacted by pressure or hydraulic pressure by
pressure or mould to apply pressure to the sand in the sand box. The
pressure is usually 0.25 to 0.4 MPa. This molding machine makes the sand
mold tightness far away from the pressure surface. The high pressure
molding machine appeared at the beginning of 1950s, and the pressure on
the sand type plane was above 0.7 MPa. The pressure head of the high
pressure molding machine is divided into several structural forms, such
as the flat press head, the forming press head and the multi contact
head. The high pressure multi touch molding machine is the most widely
used. Divided into many blocks, can move up and down contact pressure
head high pressure squeeze moulding machine, the hydraulic cylinder can
obtain great compaction force. When compacted, the contact pressure is
applied according to the height of the underneath, that is, the
thickness of the pressed sand layer, so that the sand mold can obtain
high, uniform compaction and hardness. This type of molding machine has
micro shock shock mechanism, which can adapt to the modeling of complex
pattern. The high pressure multi touch molding machine adopts four
vertical columns, with single and double position. In order to adapt to
the production of small and medium size castings, the molding machine is
mostly attached with the template fast changing device. When replacing
the template, the molding machine must not stop. With high pressure
multi contact molding, sand casting can be used to pour out thin wall,
accurate size and smooth surface casting