Full Automatic Centrifugal Casting Machine for Vacuum Pump

Two-station fully automatic centrifugal casting machine is composed of the two engines and a auxiliary engine. The two engines which are controlled by VFD are parallel layout. The two engines share auxiliary engine and pouring equipment. Auxiliary engine is controlled by servo and it includes cleaning, spraying, pouring, cooling, casting extraction devices .The whole process are controlled automatically.
The main engine's speed is adjustable and steady in the high speed.The Spraying process is very advanced of multistage velocity control. The key process parameters are real-time monitor and adjusted by automatic control system. So it can ensure the casting process parameters repetition andconsistency. It eliminates the influence of artificial factors to the casting process parameters. So it ensures stable quality of the casings.
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.
Feature
main engine
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.Auxiliaryengine
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.Spray coating device
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 The spraying speed and distance within a single journey can be divided into fouradjustable sections.
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;
Cleaning device
The cleaning trolley is driven by the ordinary motor through the rack and pinion mechanism to perform cleaning work by the cleaning brush within the scope of product specification. By taking advantage ofthe reciprocating movement of the cleaning rod, the purpose of cleaning the tube molds can be realized. The cleaningbrush can be replaced within the workpiece specification. The speed range of the cleaning trolley is 100 ~ 220mm/s.
Cooling system
The cooling system is real-time monitoring of the tube mold's temperature and control the spray water cooling.The mold temperature has a very big influence on the quality of the cylinder liner,Especially in metallographic structure and hardness of the cylinder liner.If the mold's temperature is too high, the wet coating material shall inflames, which can cause uneven coatings.It can't ensure the surface quality of the cylinder liner.In the meanwhile the service life of the molds shall be shortened. If the mold's temperature is too low. When pouring the coating can't dry out completely.The bubbles can't dissolve out completely before pouring. when the molten iron of high temperature meets the wet coating material,the casting defects such as the white casts and air pores are likely to occur to the cylinder liner.
Tool for casting extraction
Casting extraction mechanism is controlled by servo and Pneumatic control system. So it is very accurate and reliable.It can extract the casting smoothly from the tube molds. The position and speed of the casting extraction can be set up and adjusted.
Pouring system
Automatic pouring device is composed of pouring vehicle, pouring ladle, etc.
Pouring vehicle can serve two engines for pouring respectively.
The ladle's pouring speed can be adjusted.The automatic weighing device is used in pouring vehicle,which can ensure the consistency of the weight for each batch of cylinders. The weight of the molten iron in the ladle can be displayed on the big screen and the records can be printed.
Electric control system
Control system use PLC as the control core and use the man-machine interface as the monitoring system.It controls the whole process automatically and monitors the whole production process.Control system has the perfect protective measures, such as over-current protection, over-load protection, etc. The process parameters of the main engine and the auxiliary engine all can be adjusted and stored in the man-machine interface such as work positions and velocity. It meets the production process requirement of a variety of cylinder liner castings in a certain range.
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.
The castings produced by our machine
Main technical parametersnameofparameterparameter valuesunitCasting diameterΦ60~Φ120mmCasting maximum length1500mmMold raceway diameterΦ100~Φ180mmRiding wheel diameterΦ300x70mmTwo riding wheel outer span900mmThe distance between ground and mold center800mmThe hostspacing800mmSpeed of mold0~2000rpmCentrifugal machine power motor7.5kw