Centrifugal Casting Production Line for Iron Castings

Two-station Fully Automatic CentrifugalCasting MachineTechnicalSchemeDouble work position centrifugal cylinder casting machine is composed of two main engines, a set of mobile auxiliary machine working platform, a set of automatic pouring device, casting tubes conveying device, and electric control system, etc. The two main engines work coordinately with auxiliary machines, while the pouring system performing automatic pouring work to the two main engines on a time division basis.
The main engines is in horizontal supporting wheel structure, and its speed is frequency conversion regulating. Theauxiliary machines are compactly arranged on one mobile platform. The mobile platform movingand spraying vehicle both adoptservo driving method. The whole machine has the characteristics of compact structure, smooth movement, and high degree of automation.
The control system adopts PLC control system to control the actions of mainmachines and auxiliary machines, and the speed regulating process of the supporting wheels of the main machines. The variablespeed regulating system is composed of AC frequency conversion motor and AC frequency conversion speed regulator. By adopting imported AC frequency converter, the system has a characteristic of low speed and high torque, and being smooth in speed control and wide in the speedrange. The touch screen can monitor the working condition of the centrifugal casting machine and display the pouring process parameters, as well as the fault alarm information of the machine. The control system has twoworking methods, manual and automatic methods.
The equipment is composed of centrifugal main casting machine (including a large base, bearing housing, supporting wheels, bearing, main motor and its base), mobile platforms (including spray coating, cleaning, tubes drawing, mobile trolley), automatic pouring device, electric control system, cooling system, casting tubes conveying device, etc.
Mainengines1.1 The mainengineshas double working positions, and the two main engines are installed in the large base of welding structure. The large base is mounted on the embedded parts by welding or by screws mounting. Each main engine consists of four supporting wheels, divided into two pairs, respectively assembled into the driving shaft and driven shaft, which are mounted on the large base through the base plate (detachable) of the bearing seat (interchangeable in bearing maintenance). In pouring process, the tube molds are put between the two pairs of supporting wheels, a face angle of 95 - 115 degrees can be formed between supporting wheel center and the rotation center of the tube molds. When starting the equipment, the belt pulley of the motor drives the belt pulley of the main shaft (mounted on the pouring end surface of the main shaft) to rotate through the driving mechanism, and then the torque is transmitted through the friction force existing between the supporting wheels and tube molds, which in turn drive the high-speed rotation of the tube molds, and the pouring work can be processed.
1.2 Main enginesare equipped with the overall protective shield. The shield is nice in appearance, with one wholeguard covering the motor and its belt.
2. Mobile working platform of the auxiliary machine
The auxiliary machines are compactly mounted on one mobile platform, consisting of the cleaning device, tube drawing device, spraying device, and trolleys, etc. They are used to complete taskssuch as cleaning, spraying and tube drawing of the two main machines.
2.1 Spray coating device:
2.1.1 The spray coating trolley is driven by a servo motor through rackand pinion mechanism. The advancing speed is 200 ~ 300mm/s, and the reversing speed is 50 ~ 200mm/s during spray coating work.
2.1.2 The spraying speed and distance within a single journey can be divided into fouradjustable sections.
2.1.3 The air supply line is equipped with airpressure stabilizing tank, which can supply the spray pressure. The air pressure stabilizing tank is installed on the mobile platform;
What is Centrifugal Casting?
Centrifugal casting is a process that delivers castings of very high material soundness, and thus is the technology of choice for applications likejet engine compressor cases,petrochemical furnace tubes, manymilitary products, and other high-reliability applications.
In the centrifugal casting process, molten metal is poured into a spinning die. The die can be spinning either on a vertical or horizontal axis depending on the configuration of the desired part. Ring and cylinder type shapes are cast vertically; tubular shapes are made with the horizontal centrifugal process. Either process may be used to produce multiple parts from a singlecasting.External structures and shaping can be cast in place to significantly reduce post-processing including machining orfabrication.
Because of the high g-forces applied to the molten metal in the spinning die, less dense material, including impurities, "floats" to the I.D. where it is subsequently removed by machining. Solidification is managed directionally under pressure, from the O.D. to the I.D., avoiding any mid-wall shrinkage, leaving a defect-free structure without cavities or gas pockets.