Wiseman briefly analyses cnc parts machining accuracy improve machining accuracy methods

We Deal With Machining Every Day, We Often Talk About Precision, But Are You Talking About Precision Correctly? Is It Rigorous? Please Follow Huiwen To Take A Look! Machining Precision Is The Degree Of Conformity Between The Actual Size, Shape, Position Of The Surface Of The Part After Machining The Ideal Geometric Parameters Required By The Drawing! The Ideal Geometric Parameters, For Size, Are The Average Size; For Shape, They Are Absolute Circles, Cylinders, Planes, Cones, Straight Lines; For Relative Positions, They Are Absolute Parallelism, Verticality, Coaxiality, Symmetry, Etc.

1. CNC Parts Processing Dimensional Accuracy

The Degree Of Conformity Between The Actual Size Of The Part After Processing The Center Of The Tolerance Zone Of The Part Size.

2. CNC Parts Processing Shape Accuracy

Refers To The Degree Of Conformity Between The Actual Geometric Shape Of The Surface Of The Machined Part The Ideal Geometric Shape.

3. CNC Parts Processing Position Accuracy

Refers To The Difference In Actual Position Accuracy Between The Relevant Surfaces Of Parts After Processing.

4. Relationship Between CNC Parts Processing

When Designing Machine Parts Specifying The Machining Accuracy Of Parts , Machining Plants Should Usually Pay Attention To Controlling The Shape Error Within The Position Tolerance, The Position Error Should Be Less Than The Size Tolerance. That Is, For Precision Parts  Important Surfaces Of Parts, The Shape Accuracy Requirements Should Be Higher Than The Position Accuracy Requirements, The Position Accuracy Requirements Should Be Higher Than The Size Accuracy Requirements. Huiwen Zhizao Is A Machining Plant With More Than Ten Years Of CNC Machining Experience. It Has A Full Range Of Equipment, CNC Lathe/Milling/Grinding/Drilling/Machining. Partners With Parts Processing Needs Are Welcome To Call Us For Quotes.

　　The Deviation Between The Actual Geometric Parameters Of A Part The Ideal Geometric Parameters Is Called Machining Error. The Size Of The Machining Error Reflects The Level Of Machining Accuracy. The Larger The Error, The Lower The Machining Accuracy, The Smaller The Error, The Higher The Machining Accuracy.

1. Huiwen Briefly Analyzes The Introduction Of Machining Accuracy

　　The Machining Accuracy Of A Machining Plant

　　There Are 20 Tolerance Grades IT01, IT0, IT1, IT2, IT3 To IT18, Among Which IT01 Indicates That The Part Has The Highest Processing Accuracy, IT18 Indicates That The Part Has The Lowest Processing Accuracy, Generally IT7 IT8 Are Medium Levels Of Processing Accuracy.

　　The Actual Parameters Obtained By Any Processing Method Will Be Absolutely Accurate. The Perspective Of The Function Of The Part, As Long As The Processing Error Is Within The Tolerance Range Required By The Part Drawing, The Processing Accuracy Is Considered To Be Guaranteed.

The Difference Between Accuracy Precision:

1. Accuracy

　　Refers To The Degree Of Closeness Between The Measurement Result The True Value. High Measurement Accuracy Means That The Systematic Error Is Small, The Average Value Of The Measured Data Deviates Less The True Value, But The Data Is Scattered, That Is, The Size Of The Accidental Error Is Unclear.

2. Precision

　　Refers To The Reproducibility Consistency Of The Results Obtained By Repeated Measurements Using The Same Spare Sample. It Is Possible To Have High Precision But Inaccurate Accuracy. For Example, The Three Results Obtained By Measuring A Length Of 1mm Are 1.051mm, 1.053, 1.052 Respectively. Although Their Precision Is High, They Are Inaccurate.

　　The Accuracy Of CNC Parts Processing Indicates The Correctness Of The Measurement Results, The Precision Indicates The Repeatability Reproducibility Of The Measurement Results. Precision Is A Prerequisite For Accuracy.

2. Methods For Improving Machining Accuracy In Machining Plants

1. Adjust The Process System

1) Trial Cutting Method Adjustment

　　Through Trial Cutting - Measuring The Size - Adjusting The Cutting Amount Of The Tool - Cutting - Trial Cutting Again, Repeat This Process Until The Required Size Is Reached. This Method Has Low Production Efficiency Is Mainly Used For Single-Piece Small Batch Production. Huiwen Zhizao Is A Machining Factory With More Than Ten Years Of CNC Machining Experience. It Has A Full Range Of Equipment, CNC Lathe/Milling/Grinding/Drilling/Machining. Partners With Parts Processing Needs Are Welcome To Call Us For Quotation.

2) Adjustment Method

　　The Required Size Is Obtained By Pre-Adjusting The Relative Positions Of The Machine Tool, Fixture, Workpiece Tool. This Method Has High Productivity Is Mainly Used For Large-Scale Mass Production.

2. Reduce Machine Tool Errors

1) Improve The Manufacturing Accuracy Of Spindle Components

The Rotation Accuracy Of The Bearing Should Be Improved:

① High-Precision Rolling Bearings;

②Use High-Precision Multi-Oil Wedge Dynamic Pressure Bearing;

③Use High-Precision Hydrostatic Bearings,

Machining Plants Should Improve The Accuracy Of Bearing Accessories:

① Improve The Machining Accuracy Of The Box Support Holes Spindle Journals;

② Improve The Machining Accuracy Of The Surface Matching The Bearing;

③Measure Adjust The Radial Runout Range Of Corresponding Parts To Compensate Offset The Errors.

2) Properly Preload The Rolling Bearing

①Can Eliminate Gaps;

②Increase Bearing Stiffness;

③Evenate Rolling Element Errors.

3. Reduce Transmission Error Of Transmission Chain

1) Fewer Transmission Parts, Shorter Transmission Chain Higher Transmission Accuracy;

2) The Use Of Reduced Speed Transmission In CNC Parts Processing Is An Important Principle To Ensure Transmission Accuracy, The Closer The Transmission Pair Is To The End, The Smaller The Transmission Ratio Should Be;

3) The Precision Of The End Piece Should Be Higher Than That Of Other Transmission Parts.

4. Reduce Tool Wear

The Tool Must Be Re-Sharpened Before The Dimensional Wear Of The Tool Reaches The Stage Of Rapid Wear. The Team Of Shenzhen Huiwen Intelligent Manufacturing Technology Co., Ltd. Was Established In 2010 Is Located On The 1st Floor Of Building F3, Tianyou Maker Industrial Park, Lixinhu, Fuyong, Bao'an District, Shenzhen. It Has Long Been Committed To The Processing Of High-Precision, High-Difficulty, Easy-To-Deform Metal Plastic Parts , Small Medium-Volume Production Manufacturing Of Light Alloy Composite Material Parts (Such As Aluminum Alloy, Carbon Fiber, Etc.),  Robot Parts Procurement Customization Services.