Sandvik-coromant Threading Manuale Utente Scaricare il pdf (Pagina 65)

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CoroMill® Plura CoroMill® 327 CoroMill® 328

3.2 – 19

(.189 – .783)

11.7 – 21.7

(.461 – .854)

39 – 80

(1.535 – 2.480)

. Products - thread millin

Thread Milling

The main options for thread milling using Sandvik Coromant tools

are single-point threading with CoroMill® 327 and CoroMill® 328,

and multi-point threading with CoroMill® Plura.

Pitch 0.7 – 3 mm

28 – 10 t.p.i.

1 – 4.5 mm

24 – 5 t.p.i.

1.5 – 6 mm

16 – 4 t.p.i.

Cutter dia (D

), mm

(inch)

ISO

• CoroMill 327 and CoroMill 328 are  rst choice for large threads

and dif cult materials

• CoroMill Plura is  rst choice for smaller threads and easier

materials

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 117 118

Contents 1
Introduction 2
1. Basics in threads 3
Pitch diameter, d 4
Helix angle 4
Thread designations 5
Tolerance positions 6
¼” 20UNC – 2A 7
ISO - uni ed (UN): 7
Types of UN thread 7
¼” – Major thread diameter 7
Whitworth pipe threads: 8
2. Applications 9
Thread turning Thread milling 10
Thread turning 10
Thread milling 10
Insert types 11
Flexibility 12
Productivity 13
First choice 15
Insert geometries 16
MC CMC Geometries 16
ISO No. No 16
Modi ed  ank infeed 17
Radial infeed 18
Infeed value recommendations 21
Tool holder selection 22
External thread turning 23
Internal thread turning 24
External Internal 25
A negative shim must be used 25
Thread turning methods 25
Working away from the chuck 25
Insert clearance angles 26
= the angle of insert 27
Modi ed bars for small holes 30
Multi-start threads 31
NPT/NPTF UN/MM 32
Insert tool life 33
Threading large pro les 33
Thread deburring 34
Tooling inventory 36
Tool breakage 36
Chip control 36
Cutting force 37
Thread quality 37
Choice of cutting diameter 39
Tool path 40
Down milling and up milling 41
Entrance into cut – roll in 41
Feed per tooth 42
Cutting data considerations 43
Wet or dry machining 43
Internal thread 44
External thread 44
3. Products 46
Insert sizes 48
Geometries 48
The interface: holder - shim 49
The interface: shim - insert 49
Type of insert 50
Assortment - CoroThread® 266 50
. Products - thread turnin 51
3. Products - thread turnin 54
– external threading 55
-C -C-N -N-A -A 56
Assortment 60
CoroTurn® SL cutting heads – 63
Extended offer 64
Thread Milling 65
Single-point threading 66
CoroMill® 327 67
Assortment - CoroMill® 327 68
Handling 68
CoroMill® 328 69
Easy programming 70
Cutting data and programming 71
Assortment - CoroMill® Plura 71
Grade information 72
GC1125 73
GC1020 73
GC4125 74
CB7015 74
GC1105 75
4. Troubleshooting 76
Insert breakage 77
Built-up edge (BUE) 77
Abnormal  ank wear 78
Vibration 78
Poor surface  nish 79
Poor chip control 79
Shallow pro le 79
Excessive edge pressure 80
Incorrect thread pro le 80
Thermal cracks 82
Crater wear 82
Plastic deformation 82
Flank wear 83
Re-cutting of chips 84
Notch wear 84
Machine inef ciency 85
Conical threads 85
5. Technical reference 86
CoroTurn® XS 87
CoroCut® MB 87
CoroCut® XS 87
5. Technical re 88
Programming 92
CoroMill® Plura 94
ISO Metric (MM), external 96
ISO Metric (MM), internal 97
ISO inch (UN), external 98
ISO inch (UN), internal 99
ACME (AC), external 102
ACME (AC), internal 103
MJ, external 106
UNJ, external 106
Unit Radial infeed per pass 107
Multi-point 108
CoroMill 327, metric 112
CoroMill 327, inch 112
113
Formulas 114
Radial clearance 116
Flank clearance 116
Thread milling formulas 117
Internal thread milling 117
External thread milling 117
Inch/mm conversion table 118

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Sandvik-coromant Threading Manuale Utente Pagina 65

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