What does interference fit mean in machining?

Refers To A Fit With Interference (Including The Minimum Interference Equal To Zero). In This Case, The Tolerance Zone Of The Hole Is Below The Tolerance Zone Of The Shaft. (The Algebraic Difference Between The Dimensions Of The Hole In Each Direction The Dimensions Of The Matching Shaft In Each Direction Is Negative, Indicating An Interference Fit.)

In The Process Of Mechanical Processing  Manufacturing, The Matching State Of Two More Parts Can Be Roughly Divided Into Many Levels Such As Sliding Fit, Transition Fit Tight Fit. Interference Fit Is A Kind Of Tight Fit, That Is To Say, The Matching Shaft Diameter (Key Width) Must Be Larger Than The Hole Diameter (Keyway). Special Tools Must Be Used To Squeeze It In, The Characteristics Of Thermal Expansion Contraction Must Be Used To Heat The Hole (Keyway). While The Hole Diameter Is Expanding, It Is Quickly Put On The Shaft. After Cooling Shrinking, The Two Parts Will Fit Tightly Into One. The Amount Of Interference Is Detailed On The Mechanical Processing Drawings. If Some Parts Cannot Be Heated, The Shaft (Key) Can Also Be Cooled In Dry Ice, The Effect Is The Same. 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 Quotes.

The Loosest State

The Difference Between The Maximum Limit Size Of The Hole The Minimum Limit Size Of The Shaft Is The Minimum Interference Ymin, Which Is The Loosest State Of The Hole-Shaft Fit.

Folded Tightest State

The Difference Between The Minimum Limit Size Of The Hole The Maximum Limit Size Of The Shaft Is The Maximum Interference Ymax, Which Is The Tightest State Of The Hole Shaft Fit.

Basic Requirements For Interference Fit Assembly

(1) Choose Appropriate Assembly Measures According To The Size Of The Interference. Series Tolerance Has An Impact On The Size Of The Interference. During The Disassembly Assembly Process Of Mechanical Parts, Due To Different Interference Conditions, The Interference Amounts Of Mechanical Parts Are Different, The Interference Positions Sizes Are Different. Therefore, It Is Necessary To Take Corresponding Measures According To Different Situations To Ensure That The Parts Are Assembled To The Appropriate Position.

(2) The Stress Position Of Parts Assembly Should Be Appropriate Reasonable. During The Assembly Process Of Mechanical Parts, Technicians Need To Reasonably Calculate The Stress Position Of The Bearing Arrange The Stress Position Of Parts Assembly Appropriately Reasonably So That The Parts Can Be Assembled In The Correct Position Play Their Due Role.

(3) When Assembling Parts, Pay Attention To The Method Direction Of Disassembly Assembly. The Assembly Process Of Mechanical Parts Involves Many Links. If The Appropriate Method Is Adopted To Disassemble Assemble The Parts, It Will Affect The Overall Technical Quality Of The Parts Make The Disassembly Assembly Process Fail To Meet The Requirements Of Part Assembly. Therefore, When Disassembling Assembling, You Need To Pay Attention To The Method Direction Of Disassembly Assembly. 

(4) Choose To Use Professional Assembly Disassembly Tools. When Assembling Disassembling Parts, In Order To Ensure The Quality Of The Work, Technicians Need To Choose Tools Such As Torque Wrenches, Presses, Pin Pullers, Etc., So As To Ensure The Quality Of The Assembly Of Parts Increase The Service Life Of Parts. In An Emergency Situation There Are No Professional Assembly Disassembly Tools, Special Attention Should Be Paid To The Assembly Disassembly Methods. 

Shenzhen Huiwen Intelligent Manufacturing Technology Co., Ltd. Was Established In 2010. The Address Is Located At 1F, Building A2, 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. Huiwen Intelligent Manufacturing Can Currently Provide High-Quality, Low-Cost, On-Time Delivery Products In The Following Aspects.