Classification of casting molding machine

1.Compaction molding machine

Use the air pressure or hydraulic pressure to apply pressure to the molding sand in the sand box through the indenter or the pattern to compact the sand. Its pressure is generally 0.25 to 0.4 MPa. This type of molding machine makes the sand type tightness away from the pressure surface. A high-pressure molding machine appeared in the early 1950s, and the pressure on the sand plane was above 0.7 MPa. The pressure head of the high-pressure molding machine is divided into several structural forms such as a flat pressing head, a forming indenter and a multi-contact indenter. Among them, the high-pressure multi-contact molding machine is the most widely used. The high-pressure multi-contact molding machine head is divided into a number of small squares that can move up and down—contacts, which can obtain a large compressive strength through hydraulic cylinders. In real time, each contact applies a corresponding pressure according to the height of the pattern below it (ie, the thickness of the pressed sand layer), so that the sand type obtains a high, uniform compactness and hardness. This type of molding machine is equipped with a micro-shock shock mechanism that can adapt to the complex shape. The high-pressure multi-contact molding machine adopts four-column structure, and has single-station type and double-station type. In order to adapt to the production of small and medium-sized castings, this type of molding machine is often equipped with a template quick change device. When the template is replaced, the molding machine does not have to be shut down. With high-pressure multi-contact molding, sand casting can cast thin-walled, precise-sized, smooth-surfaced castings.

2. Seismic molding machine

This type of molding machine can be divided into shock shock type and micro shock type molding machine. The sand box and the pattern are fixed on the work table of the molding machine, and the sand type is compacted by the collision of the table when falling on the impact surface of the anvil and the inertia of the sand. This type of molding machine is very noisy, and the compactness of the upper part of the sand-making type is very low, and has been replaced by a micro-shock compaction molding machine.

3. Shock molding machine

The compacted sand mold is compacted to obtain a compact sand mold. Commonly used is the microseismic compaction molding machine (see picture), which uses the falling of the table to collide with the floating seismic iron, and the micro-shock compacts the sand and then compacts it. The microseismic vibration replaces the low frequency (60 to 120 times/min) of the shock-type molding machine at a relatively high frequency (500 to 1000 beats/min) and a small amplitude (5 to 25 mm) vibration. The sand mold produced by this molding machine has good quality and low basic requirements. Molding machine

4. Injection molding machine

It uses compressed air to uniformly inject the molding sand into the flask to pre-compact, and then apply pressure to compact. Commonly used are vertical split type boxless injection molding machine and horizontal type off-box injection molding machine. The vertical type boxless injection molding machine does not use a sand box, and the molding sand is directly injected into the molding room with the template. The sand making type has high dimensional accuracy. Because the sand box has cavities on both sides, the productivity is high, but the lower core is difficult. The quality of the molding sand is strict. The horizontal type off-box injection molding machine uses the sand box for modeling, and the sand type is formed after the mold is unpacked, the lower core is convenient, and the productivity is high.

5. Sand blasting machine

Use a rotating blade to throw a sand compaction sand pattern. The sand blasting machine is characterized by sand filling and compaction at the same time. The machine has simple structure, light weight and strong adaptability. However, the blades are prone to wear and have low productivity.