Machining Processes for Custom Ceramic Components

Drawing Analysis and Process Planning

Once we receive the customer’s drawing, our engineering team first conducts a detailed analysis, including:

• Part structure type (irregular shapes, curved surfaces, or rotational parts)
• Critical dimensions and tolerance requirements (tighter tolerances usually increase machining difficulty and cost)
• Presence of high-risk features such as micro-holes, deep holes, thin walls, steps, or V-grooves
• Functional requirements such as surface roughness, flatness, and concentricity
• Additional requirements such as coating, laser marking, or vacuum packaging
• Material type (Al₂O₃, AlN, Macor, Zerodur, etc.), including machinability characteristics and risk assessment

This analysis allows us to develop the most suitable machining process route before production begins.

Raw Material Selection and Pre-Machining (Allowing Machining Stock)

Based on the drawing dimensions, we select ceramic blanks with appropriate machining allowances.

Ceramics are hard and brittle materials, and machining directly from a raw blank to the final dimensions carries a high risk of cracking or breakage. Therefore, a step-by-step machining process is used to reduce damage risk and improve yield.

Surface Grinding — Establishing Dimensions and Reference Planes

The first machining step typically involves surface grinding of the ceramic blank.

This process is used to:

• Grind the outer dimensions close to the drawing requirements
• Establish reliable reference surfaces
• Control parallelism and flatness
• Provide stable clamping conditions for subsequent CNC machining

This step forms the foundation for the dimensional accuracy of the entire ceramic machining process.

CNC Precision Machining — Forming Complex Structures

After surface grinding, the ceramic parts are transferred to the CNC machining workshop.

Typical operations include:

• Milling irregular contours
• Machining steps, slots, and cavity structures
• Creating micro-holes, small-diameter holes, V-grooves, and honeycomb structures
• Strictly controlling dimensional tolerances specified in the drawing

For high-precision ceramic components, 3-axis, 4-axis, or even 5-axis CNC machines are typically used. Combined with ceramic-specific cutting tools and optimized cutting parameters, this approach helps achieve high precision while minimizing edge chipping and micro-cracking.

This machining route is suitable for most complex or irregular ceramic components.

Grinding Processes for Rotational Ceramic Components

For cylindrical, sleeve-type, or shaft-type ceramic components, grinding is typically the primary machining method, rather than CNC milling.

Centerless Grinding

• The workpiece does not require center holes or tailstock support
• Suitable for high-efficiency external cylindrical machining
• Provides excellent dimensional consistency and productivity

This process is commonly used for high-volume production of ceramic rods and shaft components.

External Cylindrical Grinding (OD Grinding)

• The workpiece is positioned using centers or fixtures
• Suitable for components requiring high concentricity and roundness

Often used for high-precision shafts and cylindrical structural parts.

Internal Grinding (ID Grinding)

• Used for machining internal holes
• Achieves high dimensional accuracy and excellent surface quality

Suitable for ceramic sleeves and precision internal bore components.

Surface Grinding

• Used for machining flat surfaces
• Controls flatness, parallelism, and thickness

Widely used in structural ceramic parts and ceramic substrates.

Polishing Process

Polishing is typically performed after the ceramic component has completed its main machining operations. It is mainly applied to functional areas specified in the drawing to improve optical performance, sealing performance, or contact characteristics.

Depending on the geometry and functional requirements, ceramic polishing is generally divided into flat polishing and curved surface polishing.

Flat Polishing

Flat polishing is mainly applied to ceramic components with functional planar surfaces, such as:

• Structural support surfaces
• Sealing contact surfaces
• Components used in electronics, optics, and semiconductor applications

Curved Surface Polishing

Curved surface polishing is used for ceramic parts with complex geometries, including:

• Arc surfaces or spherical surfaces
• Curved cavities
• Irregular or freeform surfaces

Compared with flat polishing, curved surface polishing requires more precise process control.

Selecting the appropriate polishing process helps ensure that ceramic components meet the required precision, reliability, and stability for different applications.

Value-Added Services

In addition to core ceramic machining processes, we also provide a range of value-added services to meet specific application requirements.

These services are performed after final machining to ensure dimensional accuracy and product reliability.

Available services include:

• Metallization
• Coating for ceramic or glass components
• Laser marking
• Vacuum packaging