Precision machining hardware parts factory how to choose smooth milling reverse milling?

Milling Cutters Are Generally Multi-Edge Tools. They Have High Productivity Because They Have Many Teeth Involved In Cutting At The Same Time, Have Long Cutting Edges, Can Use Higher Cutting Speeds. Different Milling Cutters Can Be Used To Process Planes, Grooves, Steps, Etc., As Well As Gears, Threads, Spline Shafts, Various Formed Surfaces. The Following Is A Brief Analysis Of The Structure, Types, Uses, How To Choose Down Milling Up Milling By Shenzhen Huiwen Intelligent Manufacturing Technology Co., Ltd. , A Shenzhen CNC Processing Factory .

1. The Structure Of The Milling Cutter

Take Indexable Milling Cutter As An Example:

1) Main Geometric Angles

The Milling Cutter Has A Main Rake Angle Two Rake Angles, One Is Called The Axial Rake Angle The Other Is Called The Radial Rake Angle.

The Radial Rake Angle Γf The Axial Rake Angle Γp, The Radial Rake Angle Γf Mainly Affects The Cutting Power; The Axial Rake Angle Γp Affects The Formation Of Chips The Direction Of The Axial Force. When Γp Is A Positive Value, The Chips Fly Away The Machined Surface.

Rake Angle (Front Contact Surface)

Negative Rake Angle: Generally Used By CNC Processing Plants For Steel, Steel Alloy, Stainless Steel, Cast Iron.

Positive Rake Angle: Used For Sticky Materials Some High-Temperature Alloys.

Middle Rake Angle: Used For Threading, Grooving, Profiling Forming Cutters. Use Negative Rake Angle Whenever Possible.

2) Milling Cutter Geometry

First Is: Positive Angle - Positive Angle

Cutting Is Light The Chip Removal Is Smooth, But The Cutting Edge Strength Is Poor. It Is Suitable For Processing Soft Materials Stainless Steel, Heat-Resistant Steel, Ordinary Steel Cast Iron. This Form Should Be Used First When Low-Power Machine Tools, Process Systems Are Rigid Enough, Built-Up Edge Occurs.

Advantage:

+ Smooth Cutting

+ Smooth Chip Removal

+ Good Surface Roughness

Shenzhen CNC Processing Factory Huiwen Intelligent Manufacturing Is A Machining Factory With More Than Ten Years Of CNC Processing Experience. It Has A Full Range Of Equipment, CNC Turning/Milling/Grinding/Drilling/Processing.Partners With Parts Processing Needs Are Welcome To Call Us For Quotes.

Disadvantages:

- Cutting Edge Strength.

- Conducive To Cutting Contact.

- The Workpiece Is Released The Machine Table.

Next Is: Negative Angle - Negative Angle

It Has Strong Impact Resistance Adopts Negative Blades, Which Is Suitable For Rough Milling Of Cast Steel, Cast Iron High Hardness High Strength Steel.

However, Milling Consumes A Lot Of Power Requires Extremely High Process System Rigidity.

Advantage:

+ Cutting Edge Strength

+ Productivity

+ Push The Workpiece Onto The Machine Table

Disadvantages:

- Higher Cutting Forces

- Chip Blocking

Finally: Positive Angle - Negative Angle

Precision Hardware Parts Processing Plant

Advantage:

+ Smooth Chip Removal 

+ Favorable Cutting Forces

+ Wide Range Of Applications

3) Milling Cutter Pitch

1) Close Teeth: High Feed Speed, Large Milling Force Small Chip Space.

2) Standard Teeth: Conventional Feed Speed, Milling Force Chip Space.

3) Sparse Teeth: Low Feed Speed, Small Milling Force, Large Chip Space.

If The Milling Cutter Is Equipped With A Dedicated Wiper Insert, The Surface Finish Depends On Whether The Feed Per Revolution Exceeds The Width Of The Wiper Flat Of The Insert. 

Number Of Teeth:

• Coarse Standard Teeth For Slot Milling (Safety)

• Close Pitch For Contour Milling (Productivity)

2. Types Uses Of Milling Cutters In Precision Hardware Parts Factories

According To The Tooth Structure, The Types Of Milling Cutters Can Be Divided Into Sharp Tooth Milling Cutters Shovel Tooth Milling Cutters. According To The Relative Position Of The Teeth The Axis Of The Milling Cutter, They Can Be Divided Into Cylindrical Milling Cutters, Angle Milling Cutters, Face Milling Cutters, Forming Milling Cutters. According To The Shape Of The Teeth, They Can Be Divided Into Straight Tooth Milling Cutters, Spiral Tooth Milling Cutters, Angular Tooth Milling Cutters, Curved Tooth Milling Cutters. According To The Tool Structure, They Can Be Divided Into Integral Milling Cutters, Combined Milling Cutters, Group Set Milling Cutters, Toothed Milling Cutters, Machine Clamp Welding Milling Cutters, Indexable Milling Cutters, Etc. However, They Are Usually Divided According To The Processing Form Of The Cutting Tooth Back.

Sharp Tooth Milling Cutters Can Be Divided Into The Following Categories:

(1) Face Milling Cutters Include Integral Face Milling Cutters, Toothed Face Milling Cutters, Machine-Clamped Indexable Face Milling Cutters, Etc., Which Are Used For Rough, Semi-Finishing Finishing Of Various Planes, Step Surfaces, Etc.

(2) End Mills Are Used To Mill Step Surfaces, Side Surfaces, Grooves, Holes Of Various Shapes On Workpieces, Internal External Curved Surfaces. End Mills Can Be Divided Into Two Categories: Left-Handed Right-Handed. Many People Still Have No Idea What Left-Handed Right-Handed Are.

Right-Hand Milling Cutter:

First, The Following Method Can Be Used To Determine Whether The Tool Is Left-Handed Right-Handed. Facing A Vertical Milling Cutter, If The Blade Groove Rises The Lower Left To The Upper Right, It Is Right-Handed; If The Blade Groove Rises The Lower Right To The Upper Left, It Is Left-Handed. Right-Handed Can Also Be Determined By The Right-Hand Rule, With The Bent Four Fingers As The Direction Of Rotation The Thumb As The Rising Direction, Which Is Right-Handed. The Spiral Blade Groove Plays A Role In Accommodating Chips Is Also The Part That Makes Up The Front Angle Front Of The Milling Cutter.

Left-Hand Milling Cutter:

Left-Handed Milling Cutters Are Generally Selected Under The Demand For High-Precision Processing. They Are Generally Used In The Processing Of Mobile Phone Buttons, Membrane Switch Panels, LCD Panels, Acrylic Lenses, Etc. Precision Hardware Parts Factories Have Some High Requirements, Especially The Production Processing Of Some Mobile Phone Buttons Electrical Panels, Which Require High Precision Smoothness. You Should Choose The Lower Row Of Cutting, Left-Handed, So As To Avoid The Whitening Of The Blade The Edge Jumping Of The Workpiece.

(3) Keyway Milling Cutter Used For Milling Keyways, Etc.

(4) Slot Milling Cutters Saw Blade Milling Cutters Are Used For Milling Various Grooves, Sides, Step Surfaces Sawing, Etc.

(5) Special Slot Milling Cutters Are Used For Milling Various Special Slot Shapes, Such As Shaped Slot Milling Cutters, Half-Moon Keyway Milling Cutters, Dovetail Slot Milling Cutters, Etc.

(6) Angle Milling Cutter: Used For Milling Straight Grooves, Spiral Grooves, Etc.

(7) Mould Milling Cutter: Used For Milling Convex Concave Forming Surfaces Of Various Moulds.

(8) Group Milling Cutters Combine Several Milling Cutters Into A Group Of Milling Cutters For Milling Complex Forming Surfaces, Surfaces Of Different Parts Of Large Parts Wide Planes, Etc. Huiwen Intelligent Manufacturing 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.),  Procurement Customization Of Robot Parts .

Relief Tooth Milling Cutter: Some Milling Cutters Require The Original Truncation Shape To Be Maintained After The Front Is Reground, Their Backs Are In The Form Of Releasable Teeth, Including Disc Slot Milling Cutters, Convex Semicircular, Concave Semicircular Milling Cutters, Double-Angle Milling Cutters, Forming Milling Cutters, Etc.

3. Down Milling Reverse Milling In Machining Plants

There Are Two Ways To Determine The Feed Direction Relative To The Workpiece The Rotation Direction Of The Milling Cutter:

The First Is Down Milling, The Direction Of Rotation Of The Milling Cutter Is The Same As The Feed Direction Of The Cutting. When The Cutting Starts, The Milling Cutter Bites The Workpiece Cuts Off The Final Chips.

The Second Type Is Reverse Milling, In Which The Rotation Direction Of The Milling Cutter Is Opposite To The Feed Direction Of The Cutting. The Milling Cutter Must Slide On The Workpiece For A While Before Starting Cutting, Starting With A Cutting Thickness Of Zero Reaching A Maximum Cutting Thickness At The End Of Cutting.

When Using A Three-Edge Milling Cutter, Some End Milling Face Milling, The Cutting Force Has Different Directions. When Face Milling, The Milling Cutter Is Just Outside The Workpiece, The Direction Of The Cutting Force Should Be Paid Special Attention To. When Milling Down, The Cutting Force Presses The Workpiece Toward The Worktable, When Milling Down, The Cutting Force Makes The Workpiece Leave The Worktable.

Down Milling Is Usually The First Choice Because It Has The Best Cutting Effect. Up Milling Is Only Considered When The Machine Tool Has Thread Clearance Problems There Are Problems That Down Milling Cannot Solve. Ideally, The Diameter Of The Milling Cutter Should Be Larger Than The Width Of The Workpiece, The Axis Of The Milling Cutter Should Always Be Slightly Away The Center Line Of The Workpiece. When The Tool Is Placed Directly Opposite The Cutting Center, Burrs Are Very Likely To Be Generated.

The Direction Of The Radial Cutting Force Will Change Constantly As The Cutting Edge Enters Exits The Cutting, The Machine Tool Spindle May Vibrate Be Damaged, The Blade May Break The Machined Surface Will Be Very Rough. If The Milling Cutter Is Slightly Off Center, The Direction Of The Cutting Force Will No Longer Fluctuate - The Milling Cutter Will Gain A Preload. We Can Compare Center Milling To Driving In The Center Of The Road.

Each Time A Milling Cutter Insert Enters The Cut, The Cutting Edge Is Subject To An Impact Load, The Magnitude Of Which Depends On The Cross-Section Of The Chip, The Workpiece Material The Type Of Cut. When Cutting In Out, The Correct Engagement Between The Cutting Edge The Workpiece Is An Important Aspect.

When The Axis Of The Milling Cutter Is Completely Outside The Width Of The Workpiece, The Impact Force During Cutting Is Borne By The Outermost Tip Of The Blade, Which Means That The Initial Impact Load Is Borne By The Most Sensitive Part Of The Tool. The Milling Cutter Finally Leaves The Workpiece With The Tip Of The Blade, Which Means That The Cutting Force Acts On The Outermost Tip Of The Blade The Beginning Of Cutting To The Leaving Of The Blade Until The Impact Force Is Unloaded. 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.

When The Centerline Of The Milling Cutter Is Exactly On The Edge Of The Workpiece, The Blade Is Out Of The Cutting When The Chip Thickness Reaches The Maximum, The Impact Load Reaches The Maximum When Cutting In Out. When The Axis Of The Milling Cutter Is Within The Width Of The Workpiece, The Initial Impact Load When Cutting In Is Borne By The Part Far Away The Most Sensitive Tip Along The Cutting Edge, The Blade Exits The Cutting More Smoothly When Retracting.

For Every Insert, The Way The Cutting Edge Leaves The Workpiece When Exiting The Cut Is Important. The Remaining Material Near The Exit May Reduce The Insert Clearance To Some Extent. When The Chip Leaves The Workpiece, A Momentary Tensile Force Will Be Generated Along The Insert Rake Face Burrs Will Often Be Generated On The Workpiece. This Tensile Force Will Endanger The Safety Of The Chip Edge In Dangerous Situations.

Comparison Table Of Down Milling Up Milling