When sourcing polished metal parts from China, finding a manufacturer that can provide both precision machining and reliable surface finishing can make the entire production process easier.
Among China's large manufacturing supply chain, Jingcheng provides CNC machining and surface finishing services for customers requiring customized precision components.
With 3-axis and 5-axis CNC machining, Jingcheng can manufacture complex metal parts and coordinate different finishing requirements according to customer drawings and specifications.
Jingcheng - CNC Machining & Polishing Manufacturer in China
Jingcheng, officially Shenzhen Jingcheng Dingyi Forming Technology Co., Ltd., is a precision manufacturing company based in Shenzhen, China.
The company focuses on custom CNC machining, prototype production, and low-volume manufacturing.
Main Manufacturing Capabilities
3-axis CNC machining
5-axis CNC machining
CNC milling
CNC turning
Drilling and tapping
Grinding
Wire EDM
Precision inspection
Metal polishing
Brushing
Bead blasting
Anodizing
Electropolishing
Passivation
Powder coating
Laser marking
Jingcheng works with a variety of materials, including aluminum, stainless steel, titanium, copper, brass, and engineering plastics.
For customers requiring polished CNC parts, machining and surface finishing can be considered together during the manufacturing process.
Why Is Polishing Important for CNC Parts?
Polishing is not only used to improve the appearance of a component.
Depending on the application, polishing can also help create a smoother surface that is easier to clean and maintain.
It can be particularly useful for components used in:
Medical equipment
Robotics
Automation equipment
Industrial machinery
Consumer products
Electronic equipment
Precision mechanical assemblies
The required finish depends on the material, application, and function of the component.
CNC Machining Before Polishing
For precision parts, the relationship between machining and polishing is important.
CNC machining creates the required geometry, including:
Holes
Threads
Slots
Pockets
Curved surfaces
Mounting interfaces
Precision mating surfaces
Polishing is then applied to the specified surfaces.
Because polishing can remove a small amount of material, critical dimensions should be considered before the finishing process begins.
At Jingcheng, manufacturing requirements can be reviewed before production to determine how machining and finishing should be coordinated.
Polishing Different Metal Materials
Different materials require different polishing approaches.
Stainless Steel
Stainless steel can be polished to a smooth and attractive surface and is widely used for industrial, medical, and consumer applications.
Jingcheng has experience machining stainless steel precision components and coordinating polishing and other surface treatments.
Aluminum
Aluminum parts can be polished when a smoother or more decorative appearance is required.
Depending on the project, polishing may also be combined with other finishing processes.
Copper and Brass
Copper and brass components can also be polished for improved surface appearance and specific application requirements.
Titanium
Titanium requires careful process control because its material characteristics differ from common aluminum and stainless steel alloys.
The finishing process should therefore be selected according to the specific application.
From CNC Machining to Finished Surface
A typical Jingcheng manufacturing workflow can include:
1. Drawing Review
Our engineering team reviews the customer's CAD model, drawing, material, tolerances, quantity, and finishing requirements.
2. Process Planning
The appropriate machining method is evaluated based on the geometry and production requirements.
3. CNC Machining
The component is manufactured using 3-axis or 5-axis CNC equipment, depending on its complexity.
4. Deburring
Sharp edges and machining burrs are removed before surface finishing.
5. Polishing
The specified surfaces are polished according to the customer's requirements.
6. Inspection
Finished parts are inspected for dimensions, appearance, surface condition, and other specified requirements.
7. Packaging
The completed parts are carefully packed according to the product requirements before shipment.
Precision Polishing for Custom Parts
Not every surface on a CNC component needs to be polished.
A typical engineering drawing may specify different requirements for different surfaces.
For example:
Functional surfaces may require a specific tolerance
Visible surfaces may require polishing
Threaded holes may require protection
Bearing seats may require controlled dimensions
Internal surfaces may require a different finish
This is why providing a detailed drawing is important when requesting polished CNC parts.
The manufacturer can then identify which surfaces require finishing and which dimensions must remain within tolerance.
Quality Control at Jingcheng
Surface appearance is only one part of quality control.
For precision CNC components, Jingcheng can inspect:
Part dimensions
Hole diameters
Thread dimensions
Critical tolerances
Surface condition
Burrs and sharp edges
Surface finish
Overall appearance
Inspection methods and equipment are selected according to the requirements of each project.
For components with tight dimensional requirements, machining and finishing need to be considered together to avoid affecting critical features.
Prototype and Low-Volume Polishing
Many customers do not need thousands of polished parts.
During product development, they may need only a few prototypes or a small batch for testing, assembly, and market validation.
Jingcheng supports prototype and low-volume production, making it possible to combine CNC machining and finishing for smaller production quantities.
This is suitable for:
New product development
Engineering prototypes
Functional prototypes
Custom mechanical components
Robotics projects
Automation equipment
Small-batch production
Why Choose Jingcheng?
Jingcheng combines CNC machining with a range of surface finishing options, allowing customers to manage different manufacturing requirements through one production partner.
3-Axis & 5-Axis CNC
Complex components can be manufactured using different CNC machining strategies according to their geometry.
Multiple Materials
Aluminum, stainless steel, titanium, copper, brass, and engineering plastics are available according to project requirements.
Surface Finishing
Polishing can be combined with brushing, bead blasting, anodizing, electropolishing, passivation, and other finishing processes.
Prototype & Low-Volume Production
Suitable for customers who need small quantities during product development or early-stage production.
Engineering Support
Our technical team reviews drawings and manufacturing requirements before production to identify potential machining and finishing issues.
Looking for a Polishing Manufacturer in China?
If you are searching for a China polishing manufacturer for custom precision parts, Jingcheng can provide CNC machining together with
