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压实式造型机

压实式造型机
Compaction moulding machine
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 moulding sand is compacted by pressure or hydraulic pressure applied to the moulding sand in the sand box through the indenter or pattern. The pressure is generally 0.25-0.4 MPa. This kind of moulding machine makes the sand moulds far from the pressure surface have poor compactness. In the early 1950s, high-pressure moulding machine appeared, and the pressure on the sand moulding plane was above 0.7 MPa. The press head of high pressure moulding machine is divided into several structural forms, such as flat press head, forming press head and multi-contact press head. Among them, high-pressure multi-contact moulding machine is the most widely used. The press head of high-pressure multi-contact moulding machine is divided into many small blocks which can move up and down, i.e. contacts, and a great pressure strength can be obtained through the hydraulic cylinder. In real-time pressing, the contacts exert corresponding pressure according to the height of the pattern below them (i.e. the thickness of the pressed sand layer), so that the sand mold can obtain high, uniform compactness and hardness. This kind of moulding machine is equipped with micro-shock mechanism, which can adapt to the complex shape. High-pressure multi-contact moulding machine mostly adopts four-post structure, with single-station type and double-station type. In order to adapt to the production of small and medium batches of castings, this kind of moulding machine is often equipped with a rapid template replacement device. When replacing the template, the moulding machine does not need to stop. With high pressure multi-contact moulding, sand casting can cast thin-walled, precise size and smooth surface.

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