CNC Precision Machining

Precision CNC Machining Factory 

CNC Precision machining is the process of cutting metal parts to make them fit the end user’s applications and functions. Much of modern machining process are carried out by computer numerical control, CNC, in which computers are used to control the movement and operation of the mills, lathes, and other cutting machines. Densen Group specializes in manufacturing OEM custom CNC machining parts with machining center, CNC machines and other special tools.

For some of the applications, just castings or forgings without machining could reach the desired tolerances and surface requirements. However, for most situation, the CNC machining are needed to match the customer's unique specifications and to make sure that the finished metal parts could work properly with other parts. Even for the investment casting parts, which have much better surface and tolerance grade than other metal forming process, still need additional processing.

To ensure the high quality and precision of the finished machining parts, the computer programs is critical. The Computer Aided Design, which is called CAD for short, and Computer Aided Manufacturing, called CAM, are both used as programs to provide detailed instructions about each step of the precision machining process. Programs like SolidWorks, ProE and UG create extremely detailed 3D models. 

 ▶ Available Ferrous Metal Materials for CNC Machining 

Cast Iron including gray iron, ductile iron, malleable cast iron 

Stainless Steel, Duplex Stainless Steel, Precipitation Hardening Stainless Steel

Carbon Steel from low carbon steel, medium carbon steel and high carbon steel. 

Alloy Steel from standard grades to special grades on request. 

Nickel Base Alloy, Cobalt Base Alloy.    

 ▶ Available Non-Ferrous Metal Materials for CNC Machining 

Aluminum and their alloys

Brass, Bronze and other Copper Base Alloys 

Zinc and their alloys

Stainless Steel 

Nickel Base Alloy, Cobalt Base Alloy. 

CNC Machining Capabilities at Densen Group

At Densen Group, we offer machining, grinding, turning, drilling, threading and other secondary processing services utilizing CNC equipment and machining center to ensure that our precision machined castings match the tight tolerances. 

Our Fully equipped machine workshops are organized to develop parts of exceptional dimensional accuracy. Our precision machining workshop are equipped with Machining Centers, CNC Machines, and Special Machined for some appointed process. Our dedication to the precision machining process is extensive. We pride ourselves on our products and services, reasonable costs, and timely delivery. The quality certifications are implementing strictly according to ISO 9001.

Precision machining can be used on many materials including gray iron, ductile iron, carbon steel, steel alloys, stainless steel, aluminum, copper, bronze, and some special alloys. 

 ▶ Equipment for Precision CNC Machining 

Convertional Machines:  20 sets.

CNC Machines: 60 sets. 3-Axis 

Machining Centers: 10 sets. 4-Axis 

Machining Centers: 5 sets. 5-Axis 

Machining Centers: 2 sets 

 ▶ Precision CNC Machining Capabilities 

Max Size: 1,500 mm × 800 mm × 500 mm 

Weight Range: 0.1 kg - 500 kg 

Annual Capacity: 10,000 tons 

Accuracy: As per standards: .... or on request. Minimum ±0.003 mm. or according to ISO 2768 Holes to ±0.002 mm dia. 

Flatness, Roundness and Straightness: As per standards or on request. 

Process Precision Machining Processes

The Machining processes are Turing, Facing, Boring, Milling, Drilling, Planning, Shaping, Grooving, Face Grinding, Cylindrical Grinding, Honing, Gear Hobbing, Threading, Lapping, Tapping.

• Honing 

 This process uses honing hole diameters ranging from 0.8mm to 100 mm and has depth up to 280 mm. The linear tolerance is 0.001 mm, roundness of 0.0005mm, and straightness of 0.0005 mm. The surface finish is Ra0.05μm. Horizontal and vertical honing machines are used and include single-spindle, twin-spindle, and six-spindle. 

• Turning

 This is the process of single point cutting of hardened pieces. Our hard turning process can machine parts with hardness over 58 HRC after heat treatment, maximum turning diameter of 26 mm, turning length up to 100 mm, dimensional tolerance of 0.005 mm, and roughness Ra0.2μm. 

• Deburring 

 Densen Group's deburring capabilities include electrochemical machining, thermal energy method, and abrasive flow machining. These are used for hydraulic, automotive, and aerospace components with crossing holes and complex inner cavity to meet strict deburring requirements. 

• I.D. and O.D. Grinding 

 This process enables us to machine shafts with diameter with 750 mm, length within 1000 mm, roundness of 0.0004 mm, and cylindricity of 0.001 mm. The inner holes range from 3 mm to 100 mm.

• O.D. Centerless Grinding 

 This is used for shafts with diameter with 200 mm, length with 400 mm, diameter tolerance of 0.001 mm, cylindric