Description of Hot Die Casting System

  + Mold Locking System 

1. The body is made of FCD material, and designed with sufficient rigidity and tear and wear withstanding.
2. The locking system is comprised of integrated four units of axial subsystems, operating on vertical slide of the walls in tangent folding operation.
3. The locking system is provided with HP and LP closing device to apply HP closing only after having secured the close of the metal molds to avoid damage to the metal molds. 
4. The machining plate is gear-driven by an oil hydraulic motor depending on the size and the thickness of the metal molds, and an inching device is provided to facilitate the adjustment of the entire unit.
5. Fixation plate, mold adjustment plate and slide plate are all given precision process by taking the parallel and closeness between arms into consideration.
6. Upon replacing the locking mold, retreat or advance the mold locking mechanism (arm, sliding plate) to facilitate the replacement.
7. The mobile pad for the insertion of the plunge bar is provided with 12 cavities. Use the cavities depending on the shape of the metal molds. The length of the plunge bar must be correct and arranged the bars in flush; and have both ends of the bar quenched.

  + Injection System 

1. Made of special cast steel with excellent heat withstanding property; oven guaranteed with its durability and containing a preheat field by taking advantage of the waste heat to preheat the raw metal before being inputted into the oven. Raw metal not preheated will cause the danger of splitting of solution because the water containment present in the raw metal. The nozzle, overheat treated gives sufficient durability. A gooseneck is built in the machine to permit the direct mounting of the nozzle to the gooseneck. Grinding is required to eliminate process traces inside the hole.
2. Injection speed has significant impacts upon the casting property. Therefore, the oil pipe used on the injection cylinder is enlarged to induce the direct consumption of the energy from the pressure accumulator.
3. Whereas the injection cylinder is in the higher temperature status, the water-cooling system is provided to protect the multiple pads.
4. The reciprocal motion of the injection oil cylinder will damage the machine in the absence of loading the piston in the oil cylinder. If such reciprocal motion without the piston is required, do it at a slower speed.

  + Press System 

This system operates on the movement of an oil hydraulic press plate to extrude the finished product. The length of the extrusion is adjusted depending on the finished product, and the extrusion speed is also adjustable.

  + Knock-off Device 

Provided over or by the mobile plate, this device operates on air cylinder to knock off the finished product at its injection inlet upon being extruded from the molds.
If the molds are designed by following the principles given below, better knock-off and reliable casting operation can be achieved:
1. Having the best balance for the molds in the course of extrusion.
2. Space to admit the finished product knocked off must be reserved over or by the molds.
3. Minimize protrusions including ventilation on the molds. 
Once the finished product is knocked off, the nozzle close to the body of the molds will automatically spray the release agent to facilitate release the finished product for the injected alloy.
Fig. 1 shows that the knock-off device is provided over or by the slide plate.
Fig. 2 shows the operation of the knock off tooling.
Fig. 3 shows the ejection of the automated oil spray device.

  + Automated Lubrication System 

Manual refill of grease is not required, and protect the service life of the console from the act of omission in manual refill. The automated lubrication system operates refill at given time and given amount for maintenance free and securing the consistency of the mechanism. Lubrication can be adjusted as applicable. Control is achieved by the pressure switch where also tells if there is any damage or oil leakage. 

  + Oil Hydraulic System 

The oil hydraulic circuit includes that for opening and closing molds, injection, extrusion, console and extraction provided in logic form to allow operation at high speed, and easier maintenance.
Speed for mold opening or closing, injection or other operation is adjustable with good consistence.
HP seamless steel pipe is used to withstand vibration, high pressure and oil leakage.

  + Automated Oil Spray System 

Whereas the melting alloy for casting (e.g. Zinc, Aluminum, or Copper) is inject onto the surface of the metal molds under high pressure, high speed and high temperature to create friction and welding between metals, i.e. the "sticky mold" . Therefore, before the injection of the casting alloy, a heat withstanding and inertia release agent is sprayed on the surface of the metal molds to produce a layer of hard film for preventing direct contact between the alloy and the metal molds, and improving the appearance and tensile strength of the finished product. Whereas the coating of the release agent is very important process to reduce the nonconformity, please carefully choose the right type of the release agent.
Use 1/2 HP, 1/2" PT inlet air compressor to spray the release agent with the air pressure maintained within the range of 4~7 kg.
The installation level of the release agent must not be less than 250 cm, and the pressure shall be 0~2 kg.

  + Cooling System 

1. Wider changes exist depending on the ambient temperature and the production. One 3/4"  PT is provided to each water inlet of the cooling system for the injection piston, and a 1-1/4"  PT is provided on the cooling water inlet at the molds to cool the entire unit. Each is provided with a water volume regulation switch.
2. Upon igniting the oven, turn on the cooling water at the oil cylinder piston; and upon closing the operation (to stop the machine), always wait for at least half an hour to turn off the cooling water, or the oil seal to the oil cylinder will be burnt out.
3. Cooling water for the mechanical parts is pooled at the same sink to be drained through a 1-1/4"  PT.

  + Combustion System 

1. Diesel or coal oil, is first pressurized by the combustor pump up to 7~9 kg/cm, and then sprayed and atomized out of the nozzle of the combustor to mix with the air delivered from within the gate, and finally ignited by a ignition stick.
2. If diesel or coal oil barrel is used for the combustion, the barrel must be provided at a level higher than that of the installation of the combustor, at least 70cm above the ground.