What are the effects of temperature changes on CNC precision parts?

We All Know That The Accuracy Of CNC Machine Tools Is Very Important One Of Its Advantages, So It Is Very Important To Grasp The Accuracy. Of Course, There Are Many Factors That Can Affect The Processing Accuracy Of CNC Machine Tools During CNC Processing . So, What Are The Effects Of Temperature Changes On The Processing Accuracy Of CNC Parts ?

Temperature Is One Of The Factors That Affect CNC Machining Accuracy, Which Is What We Often Call Thermal Deformation.

Common Temperature Changes, Such As The Temperature Of The Workshop Environment, The Heat Of The Motor The Heat Generated By The Friction Of Mechanical Movement, May Cause Temperature Imbalance In Different Parts Of The CNC Machine Tool, Thus Affecting The Processing Accuracy Of The Parts Of The CNC Machine Tool.

1. Basic Knowledge: The Impact Of Temperature Changes On Materials

As We All Know, Precision Parts Will Expand Contract Due To Heat. In Precision Machining , The Temperature Problem Must Be Ignored! Temperature Difference Is The Enemy Of Precision. If We Don't Care About The Important Issue Of Temperature, How Can We Discuss Precision? The Specific Amount Of Thermal Expansion Contraction Of Precision Parts Depends On The Material Temperature Changes.

2. Temperature Causes Detection Errors

If The Workpiece The Test Instrument Gauge Used For Testing Are Made Of Different Materials Are Under Standard Temperature Conditions During Testing, Deviations The Standard Temperature Of 20°C Will Always Be A Significant Factor In The Test Errors. For Example, If A 100 Mm Long Steel Block Gauge Is Heated To 4°C, For Example With The Palm Of Your Hand, It Will Change In Length By 4.6 Μm.

In Addition, It Is Worth Mentioning That When Measuring High-Precision Parts, The Premise Is To Have A Higher-Precision Measurement Method. If The Accuracy Index Of The Measuring Instrument Equipment Itself Is High, Does Your High Precision Come ?

3. Important Processing Concept: Maintain Thermal Stability Of CNC Parts Processing

For Example, Steel Parts: 100 X 30 X 20 Mm

The Change In Size When The Temperature Drops 25℃ To 20℃: At 25℃, The Size Is 6μm Larger, When The Temperature Drops To 20℃, The Size Is Only 0.12μm Larger. This Is A Thermal Stabilization Process. Even If The Temperature Drops Rapidly, It Still Takes A Sustained Time To Maintain Accuracy. The Larger The Object, The More Time It Takes To Restore Accuracy Stability When The Temperature Changes.

Factories Without Experience In Precision Machining Often Attribute The Cause Of Unstable Precision To Equipment Accuracy When Doing Precision Machining. Factories With Experience In Precision Machining Know That This Is The Most Basic Common Sense Pay Great Attention To The Thermal Balance Of Ambient Temperature Machine Tools. They Know Very Well That Even High-Precision Machine Tools Can Only Achieve Stable Machining Accuracy In A Stable Temperature Environment Thermal Balance State.

4. Correctly Understand Machining Accuracy Analysis

Clarify The Relationship Between Precision, Accuracy Temperature; Generally Speaking, If The Processed Parts Are More Precise But Accurate, It Is Very Likely That The Temperature Fluctuations In The Workshop Are Large, Resulting In Large Discreteness Of Accuracy; If The Processed Parts Are More Precise But Accurate, It Is Very Likely That The Temperature Fluctuations In The Workshop Are Large, But The Deviation The Standard Temperature Is Large; If It Is Neither Precise Nor Accurate, It Means That The Workshop Temperature Deviates Greatly The Standard Temperature Control Requirements.