Analysis of Causes of Pitting on Surfaces During Precision CNC Machining
Sep 10, 2025
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In the process of precision CNC machining, the appearance of pitting on surfaces is a common issue, which may arise from multiple factors. Below is an analysis of the potential causes:
Material Issues
Surface quality of materials:
The raw materials used in precision CNC machining may have defects, bubbles, impurities, etc., which could be amplified or exposed during machining, leading to pitting.
Material properties:
Different materials have varying physical properties such as hardness, toughness, and thermal conductivity, which react differently during machining and may contribute to pitting.
Tooling and Cutting Parameters
Tool wear:
Tools gradually wear out during use. Worn tools may generate unstable cutting forces during machining, resulting in pitting on the processed surface.
Improper cutting parameters:
Unreasonable settings for cutting speed, feed rate, cutting depth, etc., may cause excessive cutting forces or high cutting temperatures, leading to pitting on the machined surface.
Machining Environment and Conditions
Cutting fluid issues:
Impurities, sediments, or bubbles in the cutting fluid may affect cutting performance, causing pitting on the precision CNC machined surface. The concentration, temperature, and flow rate of the cutting fluid also need to be controlled within appropriate ranges.
Machine tool accuracy and stability:
The geometric accuracy, motion accuracy, and stability of the machine tool significantly impact machining quality. Wear or loosening of components such as guides and screws may cause inaccuracies in machining positions, resulting in pitting.
Process Design
Clamping and positioning methods:
Improper clamping and positioning of the workpiece during machining may cause vibration or displacement during cutting, leading to pitting on the machined surface.
Process route and sequence:
Unreasonable process route design or improper arrangement of machining sequences may also cause pitting on the machined surface.
Other Factors
Skill level of operators:
The skill level of precision CNC machining operators directly affects machining quality. Insufficient skills may lead to improper cutting parameter settings, unreasonable tool selection, and other issues, resulting in pitting.
Equipment maintenance and upkeep:
Regular maintenance and upkeep of equipment, including inspection and replacement of wear-prone parts, as well as maintaining cleanliness and accuracy, are crucial for reducing the occurrence of pitting.
Titanium product forms available from GNEE
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Item Name |
china wholesale stock astm b337 b338 gr1 gr2 gr9 titanium pipe titanium tubes seamless |
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Material |
pure titanium and titanium alloy |
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Standard |
ASTM B337, ASTM B338. ASTM B861, ASTM B862 |
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Brand |
China Grades: TA1, TA2, TC4 (Gr5 Equivalent), TA9 (Gr7 Equivalent), TA10 (Gr9 Equivalent), TA18 |
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Shape |
Round Titanium Tube/Pipe, Square Titanium Tube/Pipe, Rectangular Titanium Tube/Pipe, Titanium Coil Tube |
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Type |
Seamless & Welded (ASTM B337/B338 for Industrial & Heat Exchanger Applications) |
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Product name |
Pure Titanium bar/Pure Titanium rod/Titanium alloy bar/Tianium alloy rod |
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Standard |
GB/T 2965-2007 GB/T 13810-2007, ASTM B348,ASTM F67,ASTM F136, AMS4928,MIL4911 |
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Titanium type |
Commercially Pure(CP) / Titanium alloy |
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Grade |
TA1 TA2 TA3 TA4 TA5 TA6 TA7 TA8 TA9 TA10 TA11 TA12 TA13 TA14 |
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Diameter |
3-350mm |
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Length |
Max6000mm |
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Technique |
Forging, machining |
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Surface |
Acid surface or polishing, sand blasted surface |
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Shape |
Round, flat, square, hexagonal |
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Application |
Metallurgy, electronics, medical, chemical, petroleum, pharmaceutical, aerospace, etc. |
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Production Name |
Titanium plate/Titanium sheet |
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Grade |
Gr1, Gr2, Gr3,Gr4,Gr5, Gr7, Gr6,Gr9, Gr11, Gr12 ,Gr16, Gr17,Gr25 |
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Size |
All sizes can be customized |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technology |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Delivery time |
10-25days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Product name |
Titanium wire |
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Grade |
GR1,GR2,GR3,GR4,GR5,GR7,GR9,GR11,GR12,GR23 etc.
ERTi-1, ERTi-2, ERTi-3, ERTi-4, ERTi-5, ERTi-7, ERTi-9, ERTi-11, ERTi-12 |
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Size |
Dia：0.1-8mm or customizable |
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Standard |
ASTM B348,ASME SB348,ASTM B863,AWS.A5.16,GB/T3623-2007 |
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MOQ |
10kg |
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Quality and test |
Annealing, Ultrasonic testing |
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Application |
Aerospace, Chemical, Medical, Eye Frames,Welding etc |
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Feature |
High strength,Light weight,Excellent heat conduction and corrosion resistance |
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Condition |
Annealed (M), Hot Worked (R), Cold Worked (Y) |
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Surface |
Bright, Polished, Pickling, Sandblasting |
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Package |
Wooden Box |
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Product Name
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Custom Precision CNC Machining Services
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Material
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Metal: Aluminum, Stainless Steel, Copper, Iron, Titanium Alloy, Zinc Alloy, Magnesium Alloy.
Plastic: Nylon, ABS, POM, PC, PP, PE, PETG, PEEK, PMMA, PVC, UHMW.
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Surface treatment
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Anodizing, Polishing, Electroplating, Powder Coating, Sandblasting, Magnetic Polishing, Spray Painting, Drawing, Embossing, Electrophoresis, Screen Printing, Laser Engraving.
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Process
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3-Axis/4-Axis/5-Axis/6-Axis CNC Milling, CNC Turning
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Application
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Mechanical Spare Parts, Aerospace Components, Automotive Parts, Maintenance Parts
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Maximal Part Size
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3000 mm (118 in)
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Minimal Part Size
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2 mm (0.08 in)
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Drawing format
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DWG, DXF, PDF, SOLIDWORKS, PRT, STP, STEP, IGS, etc.
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Certification
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ISO 9001:2015
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GNEE is a specialized manufacturer and exporter of high-quality titanium products, including pipes, sheets, bars, wires, and fabricated parts.
We utilize advanced CNC machining, rolling, and welding equipment to ensure precision manufacturing. All products undergo strict chemical, mechanical, and non-destructive testing to guarantee compliance with international standards.
Our export-safe packaging includes wooden crates and waterproof wrapping to ensure secure delivery. If you have any needs, please feel free to contact us immediately：info@gneemetal.com
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