Huiwen Machining Manufacturer CNC Parts Processing Accuracy Measurement Methods

Machining Accuracy Refers To The Degree Of Conformity Between The Three Geometric Parameters Of The Actual Size, Shape, Position Of The Part Surface After Machining By The Machining Manufacturer  The Ideal Geometric Parameters Required By The Drawing. The Ideal Geometric Parameters, In Terms Of Size, Are The Average Size; In Terms Of Surface Geometry, They Are Absolute Circles, Cylinders, Planes, Cones, Straight Lines, Etc.; In Terms Of The Relative Positions Between Surfaces, They Are Absolute Parallelism, Verticality, Coaxiality, Symmetry, Etc. The Deviation Between The Actual Geometric Parameters Of A Part The Ideal Geometric Parameters Is Called Machining Error. Huiwen Zhizao Is A Machining Factory With More Than Ten Years Of CNC Machining Experience . It Has A Full Range Of Equipment, CNC Turning/Milling/Grinding/Drilling/Machining. Partners With Parts Processing Needs Are Welcome To Call Us For Quotes.

1. The Concept Of Machining Accuracy Of Machining Manufacturers

Machining Accuracy Is Mainly Used To Measure The Degree Of Production. Both Machining Accuracy Machining Error Are Terms Used To Evaluate The Geometric Parameters Of The Machined Surface. Machining Accuracy Is Measured By Tolerance Grade. The Smaller The Grade Value, The Higher The Accuracy. Machining Error Is Expressed By Numerical Value. The Larger The Numerical Value, The Greater The Error. High Machining Accuracy Means Small Machining Error, Vice Versa.

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

The Actual Parameters Obtained By Any Processing Method Of The Machining Manufacturer 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 Quality Of The Machine Depends On The CNC Parts Processing Quality The Assembly Quality Of The Machine. The Parts Processing Quality Includes Two Parts: Parts Processing Accuracy Surface Quality.

Machining Accuracy Refers To The Degree To Which The Actual Geometric Parameters (Size, Shape Position) Of The Parts After Machining Are Consistent With The Ideal Geometric Parameters. The Difference Between Them 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. 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 Quotes.

2. Related Contents Of Machining Accuracy

(1) Dimensional Accuracy

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

(2) 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) Position Accuracy

Refers To The Actual Position Accuracy Difference Between The Relevant Surfaces Of Parts After Machining By The Machining Manufacturer.

(4) Mutual Relationship

Usually When Designing Machine Parts Specifying The Machining Accuracy Of CNC Parts, Attention Should Be Paid To Controlling The Shape Error Within The Position Tolerance, The Position Error Should Be Smaller Than The Size Tolerance. That Is, For Precision Parts  Important Surfaces Of Parts, The Shape Accuracy Requirement Should Be Higher Than The Position Accuracy Requirement, The Position Accuracy Requirement Should Be Higher Than The Size Accuracy Requirement.

3. Machining Manufacturer Adjustment Method

(1) Adjust The Process System

(2) Reduce Machine Tool Errors

(3) Reduce Transmission Chain Transmission Error

(4) Reduce Tool Wear

(5) Reduce The Stress Deformation Of The Process System

(6) Reduce Thermal Deformation Of The Process System

(7) Reduce Residual Stress

4. Causes Of Impact

(1) Processing Principle Error

Processing Principle Error Refers To The Error Caused By Using An Approximate Blade Profile An Approximate Transmission Relationship For Processing. Processing Principle Error Often Occurs In The Processing Of Threads, Gears, Complex Curved Surfaces.

In Processing, Approximate Processing Is Generally Used To Improve Productivity Economy Under The Premise That The Theoretical Error Can Meet The Processing Accuracy Requirements. Huiwen Zhizao Is A Machining Factory With More Than Ten Years Of CNC Processing Experience. It Has A Full Range Of Equipment, CNC Lathe/Milling/Grinding/Drilling/Processing. Partners With Parts Processing Needs Are Welcome To Call Us For Quotation.

(2) Adjustment Error

The Adjustment Error Of A Machine Tool Refers To The Error Caused By Inaccurate Adjustment.

(3) Machine Tool Error

The Machine Tool Error Of The Machining Manufacturer Refers To The Manufacturing Error, Installation Error Wear Of The Machine Tool. It Mainly Includes The Guide Error Of The Machine Tool Guide Rail, The Rotation Error Of The Machine Tool Spindle, The Transmission Error Of The Machine Tool Transmission Chain.

5. Measurement Method

The Machining Accuracy Adopts Different Measurement Methods According To Different Machining Accuracy Contents Accuracy Requirements. Generally Speaking, There Are The Following Methods:

(1) Machining Manufacturers Can Be Divided Into Direct Measurement Indirect Measurement According To Whether They Directly Measure The Measured Parameters.

Direct Measurement: Directly Measure The Measured Parameter To Obtain The Measured Dimension, Such As Using A Caliper Comparator.

Indirect Measurement: Measure The Geometric Parameters Related To The Measured Dimension Obtain The Measured Dimension Through Calculation.

Obviously, Direct Measurement Is More Intuitive, While Indirect Measurement Is More Complicated. Generally, When The Measured Size Direct Measurement Cannot Meet The Accuracy Requirements, Indirect Measurement Has To Be Used.

(2) Depending On Whether The Reading Of The Measuring Instrument Directly Represents The Value Of The Measured Dimension, It Can Be Divided Into Absolute Measurement Relative Measurement.

Absolute Measurement: The Reading Directly Indicates The Size Of The Measured Dimension, Such As When Measured With A Vernier Caliper.

Relative Measurement: The Reading Value Only Indicates The Deviation Of The Measured Dimension Relative To The Standard. For Example, If You Use A Comparator To Measure The Diameter Of A Shaft, You Need To First Use A Gauge Block To Adjust The Zero Position Of The Instrument, Then Measure. The Measured Value Is The Difference Between The Diameter Of The Shaft Being Measured The Size Of The Gauge Block. This Is Relative Measurement. Generally Speaking, Relative Measurement Has Higher Accuracy, But The Measurement Is More Troublesome.

(3) Depending On Whether The Measured Surface Is In Contact With The Measuring Head Of The Measuring Instrument, It Is Divided Into Contact Measurement Non-Contact Measurement.

Contact Measurement: The Measuring Head Is In Contact With The Surface Being Contacted, There Is A Mechanical Measuring Force. For Example, Measuring A Part With A Micrometer.

Non-Contact Measurement: The Measuring Head Does Contact The Surface Of The Measured Part. Non-Contact Measurement Can Avoid The Influence Of Measuring Force On The Measurement Result. Such As Using Projection Method, Light Wave Interference Method, Etc.

(4) According To The Number Of Parameters Measured At One Time, It Is Divided Into Single Measurement Comprehensive Measurement.

Single Measurement: Each Parameter Of The Measured Part Is Measured Separately.

Comprehensive Measurement: Measure The Comprehensive Indicators That Reflect The Relevant Parameters Of The Parts. For Example, When Measuring The Thread With A Tool Microscope, The Actual Thread Diameter, Thread Profile Half-Angle Error Pitch Cumulative Error Can Be Measured Respectively. 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.

Comprehensive Measurement Is Generally More Efficient More Reliable In Ensuring The Interchangeability Of Parts. It Is Often Used For The Inspection Of Finished Parts. Single Measurement Can Determine The Error Of Each Parameter Separately. It Is Generally Used For Process Analysis, Process Inspection Measurement Of Specified Parameters.

(5) According To The Role Of Measurement In The Processing, It Is Divided Into Active Measurement Passive Measurement.

Active Measurement: Machining Manufacturers Measure Workpieces During The Machining Process, The Results Are Directly Used To Control The Machining Process Of Parts, Thereby Preventing The Generation Of Waste In A Timely Manner.

Passive Measurement: Measurement Performed After The Workpiece Is Processed. This Type Of Measurement Can Only Determine Whether The Workpiece Is Qualified Is Limited To Discovering Removing Waste.

(6) According To The State Of The Measured Parts During The Measurement Process, It Is Divided Into Static Measurement Dynamic Measurement.

Static Measurement: Measurement Of Relative Stillness, Such As Measuring Diameter With A Micrometer.

Dynamic Measurement: During Measurement, The Measured Surface The Measuring Head Make Relative Motion In A Simulated Working State.

Dynamic Measurement Methods Can Reflect The Situation Of Parts Close To The State Of Use, Which Is The Development Direction Of Measurement Technology. 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 Materials (Such As Aluminum Alloy, Carbon Fiber, Etc.),  Robot Parts Procurement Customization Services.