Welcom to Qingdao Donrex Co., Ltd. Offical Website!


Qingdao Donrex Co., Ltd.

Contact Us

Add: 1408, building2, Noble plaza, No.328, Dunhua Road, Qingdao, China

Tel: 86 532 85800130

Fax: 86 532 85699926

Email: [email protected]

Sand casting process

Sand Casting Technology Process

Process design→Tooling designCoremaking→Mould assembling→Melting and pouringMould openingCuttingShot blasting→Grinding→Heat treatmentShot blasting→Inspectation→MachiningInspectation&Packing


Main products:

Seamless Rolled Rings for slewing ring bearings, Turntables, wearing rings, wind turbine slewing rings, wind turbine blade bearings, yaw bearings inner and outer rings, pitch bearings inner and outer rings. 

Seamless Rolled Rings for large non standard flanges, large custom flanges, small wind tower flanges. 

Large diameter customized flanges. 

Ring Gears, Gear Rings, Circle Gears, Solid tyre and wheels, Seamless rolled neck rings. 

Main material: 

A105, A266 Gr1 to Gr4, SA350LF2, A694, C22, S235, S275, S355J0 

42CrMo4, AISI 4140, CK45, 1050, C50, SCM440, S48C, 
S355NL, S355J2G2, S355JR, Q345E, Q345D


The stamping process is the forming of metal made out of sheets containing:


The sheet metal is formed into preset shapes in a stamping press. The tool and die is the component of the press that forms parts when the sheet metal is inserted.  The shaping of parts is completed by the tool and die component called the punch.  The punch pushes the sheet metal through the cavity of the die, creating the shape desired.

We have 4 different types of stamping that can be completed on sheet metal.

Electric Metal Stamping- This is when electric components are used to stamp metal.

Fourslide Metal Stamping- Intricate stamps are produced from stripes and wires by fourslides.  The slide tools go into metal blanks from 4 directions at 90 degrees.

Progressive Metal Die Stamping- This type uses several workstations in which the metal moves from station to station to complete the stamping process.

Short Run Metal Stamping- This is the most involved and expensive type, but produces from 5-10,000 stamped pieces.


All types of stamping can be characterized by the following:

Multiple forming operations are used at once

Small pieces are mass produced at a fast pace

Time and money are saved by combining operations

Small parts are produce accurately

CNC machining process

Donrex specializing in the production and processing of various diameters (1 mm-200mm), length (2 mm-300mm), different materials (copper, iron, stainless steel, aluminum), computer, automatic lathe and secondary processing hardware products, and products are mainly used in communications equipment, electrical toys, computer parts, household appliances, temperature control unit, for a number of well-known enterprises used in the industry have good reputation. 

We have first-class production equipment, CNC computer numerical control lathes, automatic lathes, milling machines legislation as the main horizontal productivity; drilling, tapping machines, carving machine, rubbing spent auxiliary machine for processing. Design of a rich, sophisticated products of the engineers, technicians and skilled workers. Employees are well-trained, mastering Shaft accessories to the production technology and equipment operating skills. Completely possible for the customer to map sample manufacturing, from production to various surface treatments, such as technology, and give customers the confidence of a 100% guarantee.

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