production-processes1"Our knowledge, your added value"

We are technological leaders in highpressure aluminium injection and machining for transmission and engine components.

We offer the sector our knowledge and experience right from the initial tool design and development stages, processes which provide the market with high value added solutions.

Production Processes



Toolmaking and Design.


Engineering section equipped with 2D and 3D design programs for the development of parts , moulds, trim-dies and special machines with an adequate connection of engineering section with CNC machines permits us to develop all the necessary tools.

Mould manufacturing facility equipped with CNC milling machines, lathes, high-speed machining programs and press for mould adjustment it is one of the important steps to obtain the expected result.

Manufacturing of moulds, trim-dies, Tools and special machines for the industrialization of products according to client specification.



High Pressure Die Casting.


The pressure cycle in a modern HPDC machine is closely controlled in all stages, filling times are typically on the order of 10-25 milliseconds

Once the die is filled, pressures, which may exceed 70 MPa, are maintained on the casting, using an accumulator, until solidification is complete (third stage, at right)

With the potential for highly automated operation, the high-pressure die casting process is capable of extremely high levels of productivity.

Multiple hydraulic circuits are used depending on the plunger speed needed at each stage.

Die casting requires that aluminum is heated well into its liquid phase for injection.

The melting point of aluminum is specifically dependent on its alloy, but generally full liquid phase is met at above 1.100 degrees fahrenheit.

Aluminum temperatures generally must be taken several hundred degrees higher than this in order to assure that alloy chemistry is maintained.

Once melted and taken up to proper temperature, the aluminum is transferred to each die cast machine utilizes a filtration method to take out impurities and oxides of the liquid aluminum as the aluminum is pumped out of the reverbatory furnace.



CNC Machining.


Although the die casting process is capable of producing net shape components, some parts still require post-cast machining and finishing.

Tapping of internal threads or removing draft angles on tightly toleranced bores are some of the common secondary machining requirements.

HUIZHENG has acquired extensive resources for complete machining and finishing to satisfy any requirement, including sub-assembly.

Our multi-axis CNC machining centers and conventional machining/work cells provide cost-effective secondary operations.



Surface Finishing


There are many ways to ensure a flash free finish, but when needed, our secondary operations will ensure a clean component ready to accept an applied surface finish.

External surface finishes are applied to die castings when desired by the customer and we helps them to select the best tooling and process design.

Zinc, aluminum and magnesium alloys are relatively active metals that react chemically with the atmosphere. This potential weakness is actually a great strength, as the oxidation forms a formidable barrier coating against further deterioration. Most die cast applications need no further protective surface treatment to function in their environment.

One vital factor in keeping corrosion resistance of untreated parts low is the purity of the alloys from suppliers and subsequent internal housekeeping. Alloy composition must be controlled tightly, as the presence of specification material will affect not only corrosion resistance, but also many other mechanical and physical properties.

Where components are exposed to an external environment, salt spray tests are often specified.





Furthermore, we offer a full range of assembly operations and custom packaging according to the client requirements.

A wide supplier base for Sheet Metal Parts, Forgings, Springs, Sintered Products, Seals, Plastic Parts, Bearings, Friction Material, etc. gives Huizheng the expertise to supply full assemblies and modules to OEMs and Tier 1 Suppliers.

Integrating casting, machining, painting and assembly is our key to driving up quality whilst driving down lead times and cost to the OEMs.



Welding Series.


By the long Huizheng experience and by the importance of the welding in some of our manufactured products the traditional welding processes like Manual Arc Welding, TIG and MIG are the processes that we bring under control perfectly.

In TIG welding, an arc is drawn between a non-consumable tungsten electrode and the work piece. The electrode, the arc and the weld pool are protected from the atmosphere with an inert shielding gas. Rods are also used for hardfacing with the Oxy Acetylene welding process. With the correct operation, a very low level of iron dilution can be achieved in the overlay.

With the MIG that is an arc welding process where hardfacing wire is fed continually from a spool through the welding torch into the arc, where it is melted and transferred to the work piece.

In the case of MIG/MAG welding, the weld pool is protected from the atmosphere with a stream of shielding gas. These MIG/MAG processes are very flexible, i.e. they can be partially or fully mechanised and they are suitable for a wide range of applications.

Flexible and manual operation
with the possibilities to be partially or fully mechanised and the low dilution are the benefits that we can offer with our welding processes.