Technical field:
Development of Forgings for aerospace products
Title of Invention:
Development of 6 types of Titanium compressor blade forgings with axial entry root for turbo
shaft engine with combination of two blades in one forging, in particular to TV3 Engine, from
7st to 12th stage
Back ground and related art:
Turbo shaft engine compressor blades for 6 parts (Part nos.7813-9131,7813-9132,7813-
9133, 7813-9134, 7813-9135, 7813-9136) made of Titanium alloy used in 7stto 12th stages of
TV-3 engine of MI-17 Helicopter. The forgings for these blades are imported from OEM,
which are very much bulky leading to more material rejection during machining process. In
order to make light weight forgings, this invention aims at design and manufacturing of new
forgings which will be cheaper in comparison to OEM forgings and also machining time will
be reduced, leading to more productivity.
Description of Figures:
Fig.-1: represents the forging drawing part no 7813-9131,7813-9132 of 7th stage compressor
rotor blade. Machining allowance provided on the root is up to 3mm and on the profile upto
1.5mm. A tooling lug was provided for holding purpose at the time of machining.
Fig.-2: represents the forging die drawing in which the forging allowances were added and
developed tool drawing. Accordingly the tool was made through CNC machining route. The
material used for the die is H-12 having hardness 51 - 53 HRC.
Fig.-3: represents the forging drawing part no 7813-9133, 7813-9134, 7813-9135, 7813-9136
of 12th stage compressor rotor blade. Machining allowance provided on the root is up to 3mm
and on the profile upto 1.5mm. A tooling lug was provided for holding purpose at the time of
machining.
Fig.-4: represents the forging die drawing in which the forging allowances were added and
developed tool drawing. Accordingly the tool was made through CNC machining route. The
material used for the die is H-12 having hardness 51 - 53 HRC.

Detail description
Material used for the blades: BT-9 and the mechanical properties required are:
Ultimate tensile strength at room temp: 105 kg/mm2
Relative % elongation : 9%
Relative reduction in Area : 30%
Impact strength : 3 KgM/cm2
The development of 6 types of forgings involves the following methodology:
1. Development of forging drawings
2. Development of Tool drawings
3. Manufacturing of tools in in-house
4. Development of forging technology
5. Manufacturing of forgings
6. Testing of test specimen after forging & Heat treatment
7. Trial Machining
8. Process establishment
9. Documentation freezing

CLAIMS
We claimed that
1. The method consists of design development and manufacturing of 6 types of
compressor blades with BT-9 Titanium alloy through forging route from 7th to 12th
stages with combination of two blades in one forging.
2. The method as claimed in claim 1 consists of the design of forging drawing and tool
drawings
3. The method as claimed in claim 1 consists of establishing the process parameters in
manufacturing of forgings
4. The method as claimed in claim t consists achieving the mechanical properties