Precision hardware processing factory briefly analyses the method of improving drilling accuracy

1. The Basic Concept Of Drilling In Precision Hardware Processing Plants

    Generally Speaking, Drilling Refers To A Method Of Machining Holes On The Surface Of A Product Using A Drill. Generally Speaking, When Drilling A Product On A Drilling Machine, The Drill Should Perform Two Movements Simultaneously:

    ① Main Motion, I.E. The Rotational Motion Of The Drill Bit Around Its Axis (Cutting Motion);

    ② Secondary Motion, That Is, The Linear Motion Of The Drill Bit Toward The Workpiece Along The Axial Direction (Feed Motion).

    When Drilling Holes In CNC Precision Parts , The Drill Bit Has Structural Defects, Which Will Leave Marks On The Processed Parts Affect The Quality Of The Workpiece. The Processing Accuracy Is Generally Below IT10, The Surface Roughness Is About Ra12.5μm, Which Belongs To The Rough Processing Category. 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. Operation Process Of Drilling In Mechanical Processing Plant

Marking: Before Drilling Holes In Precision Parts , You Must First Understand The Drawing Requirements. According To The Basic Standard Requirements For Drilling, Use Tools To Mark The Center Line Of The Hole Position. The Center Line Must Be Clear Accurate, The Thinner The Better. After Marking, Use A Vernier Caliper Steel Ruler To Measure.

Draw A Check Grid Check Circle: After The Lines Are Drawn Checked, A Check Square Check Circle With The Center Line Of The Hole As The Center Of Symmetry Should Be Drawn As A Check Line For Trial Drilling, So As To Check Correct The Drilling Position During Drilling.

Punching Holes: After Marking The Corresponding Inspection Squares Circles, You Should Carefully Punch Holes. Punch A Small Point First, Measure Several Times In Different Directions Of The Cross Center Line To See If The Punch Is Indeed Punched At The Intersection Of The Cross Center Line, Then Punch The Sample Punch Straight, Round, Enlarge It With Force To Accurately Center The Knife.

Precision Hardware Processing Factory

Test Drilling: Before Formal Drilling, You Must First Test Drill: The Hardware Processing Factory Drills The Cross-Edge Of The Drill Bit To The Center Of The Hole Drills A Shallow Pit, Then Visually Check Whether The Shallow Pit Is In The Right Position, It Is Necessary To Continuously Correct The Deviation So That The Shallow Pit Is Coaxial With The Inspection Circle. If The Deviation Is Small, You Can Push The Workpiece In The Opposite Direction Of The Deviation While Starting The Drill To Achieve Gradual Correction.

Drilling: Machine Drilling Is Generally Operated By Manual Feeding. When The Test Drilling Position Accuracy Requirements Are Met, Drilling Can Be Carried Out. When The Precision Hardware Processing Factory Manually Feeds, The Feed Force Should Cause The Drill Bit To Bend To Avoid Skewness Of The Hole Axis.

3. Methods For Higher Drilling Accuracy In Precision Hardware Processing Plants

1. Sharpening The Drill Bit Is The Beginning Of Everything:

    Before Drilling, You Should Choose The Appropriate Drill Bit For Sharpening. In Addition To Ensuring That The Top Angle, Back Angle, Chisel Bevel Angle Of The Sharpened Drill Bit Are Accurate, The Length Of The Two Main Cutting Edges Is Flat Symmetrical With The Center Line Of The Drill Bit, The Two Main Back Blades Are Smooth, In Order To Facilitate Centering Reduce The Roughness Of The Hole Wall, The Chisel Edge The Main Cutting Edge Should Be Properly Sharpened (It Is Best To Rough Grind On A Grinder First, Then Fine-Tune On An Oilstone). 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.

2. Accurate Marking Is The Basis:

    When Marking With A Height Gauge, The Standard Should Be Accurate. When Marking, The Angle Between The Marking Needle The Marking Plane Of The Workpiece Should Be 40° To 60° (Along The Marking Direction) To Make The Marked Lines Clear Even.

    Pay Attention To The Selection Of The Marking Reference Surface, The Reference Surface Must Be Accurately Processed, Its Own Flatness Perpendicularity With The Adjacent Surface Must Be Guaranteed. After The Hole Cross Line Is Drawn, In Order To Ensure Easy Alignment When Drilling, Use A Center Punch To Punch Out The Center Point On The Cross Line (The Punch Point Must Be Small The Direction Must Be Accurate).

3. Correct Clamping Is The Key:

    Generally, For Holes With A Diameter Less Than 6mm, If The Precision Is High, You Can Use Hand Pliers To Clamp The Workpiece For Drilling; For Holes With A Diameter Of 6-10mm, If The Workpiece Is Regular Flat, You Can Use Flat-Nose Pliers To Clamp It, But The Surface Of The Workpiece Should Be Perpendicular To The Spindle Of The Drilling Machine. When Drilling Holes With Larger Diameters, The Flat-Nose Pliers Must Be Fixed With A Bolt Pressure Plate; For Larger Workpieces With A Drilling Diameter Of More Than 10mm, Use The Pressure Plate Clamping Method To Drill.

4. Accurate Alignment Is The Key:

    After The Workpiece Is Clamped, Do Rush To Drill, But Align It First.

    There Are Two Types Of Alignment: Static Alignment Dynamic Alignment. The So-Called Static Alignment Refers To The Alignment Before The Drilling Machine Is Started, So That The Center Line Of The Drilling Machine Spindle Is Aligned With The Intersection Of The Cross Lines Of The Workpiece. This Method Is Safe Convenient For Beginners Relatively Easy To Master. However, Since It Does Take Into Account Uncertain Factors Such As The Swing Of The Drilling Machine Spindle, The Drilling Accuracy Is Low. Dynamic Alignment Is The Alignment After The Drilling Machine Is Started. While Aligning, Some Uncertain Factors Are Taken Into Account, The Accuracy Is Relatively High. 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.

5. Careful Testing Is Essential:

    Testing Can Accurately Timely Discover The Accuracy Of The Hole So That Necessary Measures Can Be Taken To Compensate.

    For Holes With High Drilling Accuracy, We Generally Use The Processing Technology Of Drilling, Reaming Boring. After Drilling A Small Hole In The First Step, Use A Caliper To Detect The Error Offset The Center Of The Bottom Hole To The Reference Surface. After Actual Measurement, The Position Of The Bottom Hole The Ideal Center Is Calculated. If The Error Is Greater Than 0.10mm, When Expanding The Hole, The Drill Head Angle Can Be Appropriately Increased, The Automatic Centering Effect Can Be Weakened, The Workpiece Can Be Properly Pushed In The Positive Direction, The Drill Tip Diameter Can Be Gradually Increased To Compensate. If The Error Is Greater Than 0.10mm, The Two Sides Of The Bottom Hole Can Be Trimmed With Assorted Round Files, The Trimmed Part Should Be Smoothly Connected With The Arc Of The Bottom Hole.