Technology II. Manufacturing methods
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1 Technology II Manufacturing methods
2 Gears Machining GEAR TYPES Cylindrical gears: - spur - helical Bevel gears: - straight - curved (spiral) Worm wheels and worms 2
3 Involute tooth profile 3
4 Spur and helical gears cutting METHODS: form milling using a cutter (with the same edge profile as the shape of the tooth space) and a dividing device hobbing using a hob and a generating process for creating a tooth profile shaping using a shaper cutter and a generating process for creating a tooth profile broaching 4
5 Gear machining form milling (single gear tooth cutter) 5
6 Gear machining form milling V1 6
7 Gear milling tollerances and surface finish Type of cut IT Ra Form milling shape mill ,2-6,3 End milling 8-9 3,2-6,3
8 Gear machining - hobbing Hob a tool designed as a worm shaped cutter, which acts by the cutting as a worm cooperating with the machined gear wheel 8
9 Hobbing cutter 9
10 Gear hobbing 10
11 Gear hobbing 11
12 Gear hobbing machine tool 12
13 Gear hobbing machine tool 13
14 Gear hobbing kinematic schema 14
15 Gear machining - shaping circular shaper cutter rack shaper cutter 15
16 Gear shaping a circular cutter 16
17 Gear shaping a circular cutter 17
18 Gear shaping the principle 18
19 Gear shaping a circular cutter 19
20 Gear shaping a rack cutter 20
21 Gear shaper with the rack cutter 21
22 Tollerances and surface finish Type of cut IT Ra Hobbing 5-7 0,8 3,2 Shaping circular cutter Shaping rack cutter 5 6 0,8 1, ,8 1,6
23 Broaching Very productive method Broach has the shape of gear Ideal for internal gears Tooth gaps one after another All gaps simultaneously Desc.: 1 elongated body, 2 teeth, 3 gullets, 4 teeth gaps, 5 axis, 6 follower end, 7 pull end, 10 outside shape of broach
24 Broaching From a premachined hole a final gear is made
25 Broaching Type of cut IT Ra Roughing 5 6 0,8 1,6 Finishing 4-5 0,8 1,6
26 Spur and helical gears finishing METHODS: shaving for gears without heat treatment grinding mostly for gears after heat treatment - form grinding - involute - generating grinding lapping teeth rounding creating a shape of tooth (in the direction parallely to the axis of rotation) to make changing gears easier 26
27 GEAR WHEELS SHAVING A gear wheel being shaved is run in contact with a shaving cutter Shaving cutter HSS tool; teeth with serrations, which are acting in the shaving 27
28 GEAR WHEELS SHAVING The gear and the cutter are run in mesh with their axes crossed at a small angle. During the rotation the gear is reciprocated longitudinally across the cutter. This shaving process causes very fine chips are cut from the tooth surface (process requires less than 1 minute) 28
29 Form gear grinding 29
30 Form splining grinding 30
31 Involute-generating grinding 31
32 Involute-generating grinder 32
33 Involute-generating grinder 33
34 Gear finishing tollerances and surface finish Type of cut IT Ra Shaving 5-6 0,4 0,8 Form grinding 5 7 0,2 1,6 Involute-generating grinding with straight-sided grinding wheels Involute-generating grinding with a worm grinding wheels 2-4 0,2 0, ,2-0,8
35 Gear lapping On finished, shaved and hardened gears. The gear runs in contact with one or more cast iron lapping gears Flow of oil with abrasive is used Improves surface quality at low costs then grinding Ra = 0,1 0,2
36 Teeth rounding 36
37 Teeth rounding 37
38 Straight bevel gears cutting METHODS: form milling using a cutter (with the same form as the tooth face) and creating first one, than the opposite face flank of the tooth involute-generating milling using two cutters representing one tooth of a rack and a generating process for creating a tooth profile shaping using a shaping rack tool and a generating process for creating a tooth profile broaching using rotational broach 38
39 Straight bevel gears involute-generating milling 39
40 Straight bevel gears - shaping 40
41 Straight bevel gears - broaching 41
42 Straight bevel gears - broaching 42
43 Curved bevel gears cutting METHODS: Gleason teeth curved in the form of circle Oerlikon teeth curved in the form of epicycloid Klingelnberg teeth curved in the form of involute 43
44 Gleason method Tool is a composition of a round body and cutting tools. The can be adjusted separatelly.
45 Curved bevel gears - Oerlikon 45
46 Curved bevel gears - Oerlikon 46
47 Worms and worm gears Worms produced by turning or form milling
48 Worms and worm gears Worm gears produced by hobbing Worm hob has a small diameter In feed machining
49 CNC machines Dedicated hobbing machine: - Expensive machine - Limited in size(modulus) - Limited in shape (kinematics) - used to be only option CNC lathe with a special tool and cycle in control system - Economical benefit - One-step machining including gear - Easy setup 49
50 CNC machining of gears Sandvik Coromant Milling in soft and hard state of material! Method Up-Gear Technology for milling of gears
51 CNC machining of gears Sandvik Coromant Milling in soft and hard state of material! InvoMilling method multiprocesssing machining centers - dry cutting - multiaxis machining - costs reduction
52 CNC machining of gears Sandvik Coromant Milling in soft and hard state of material! InvoMilling method multiprocesssing machining centers
53 CNC machining of gears Seco Tools Gear roughing Roughing of external gears
54 Seco Tools CNC machining of gears Finishing of gear profiles external Finishing of gear profiles internal
55 Seco Tools CNC machining of gears Hobbing cutter with indexable inserts
56 Seco Tools CNC machining of gears Two screw threaded hobbing cutter for gears with inserts
57 CNC machining of gears GEAR SKIVING (POWER SKIVING) like hobbing - hob is helical, and slow - skiving is spur and high speed - high quality, productivity (high vc) one machine machining - straight and helical gears
58 Power skiving
59 59
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