1.Title of the invention
Progressive Forming Technique (PFT) for Inconel and Stainless Steel Pipe or Ducts with various shapes
2.Field of invention
1. This invention relates to the new fabrication process or method called the Progressive Forming Technique (PFT) for forming Inconel and Stainless steel ducts or pipes with intricate shapes and provides an easy, simple and reliable process. As well as the requirement of female tool eliminated
3.Use of invention
This invention finds its applicability in the easy, simple, fast and safe way of fabrication of various ducts and pipes of intricate shape of inconel as well as of steel required for an aircraft. The invention may also be used in other industries like Automobiles, Boilers manufacturers etc. where in the requirement of stainless steel or inconel Ducts and Pipes are envisaged
4. Prior art
• The Inconel and Stainless steel Pipeline or ducts were manufactures manufactured with the help of male and a female tool. This process called for separate wooden base for each and every tool. Also this process involves High Pressure Rubber press for forming of .Inconel and Stainless steel parts. The forming process using High Pressure Rubber Press requires Skilled operator or Technician to fabricate defect free parts which are prone for thinning at Sharp radius, Dent Marks and crack formation
5.Draw backs of prior art
•Improper shape formation
•Lots of wrinkles and dent marks
•Wooden base for each and every part
•A female tool was must
•Dependence on Rubber press
•Dependence on skilled technician

6.Comparison between prior art and present invention
1. The Progressive Forming Technique (PFT) is a simple, easy, cost saving method and safe way to fabricate various ducts and pipes of intricate shape of inconel or stainless steel material. It eliminates single Die concept for forming operation. With new Forming technique the same forming plates can be used to form mirror image parts
7.Aim of the invention
Aim of the invention is find the simple's method or Process to fabricate Pipes and ducts having qualities of high strength and corrosion resistance like Inconel or Stainless Steel for an aircraft Industry.
8.Summary of the present invention
Inconel and Stainless steel are among the very important materials in aircraft industry that we use on regular basis for High strength & corrosion resistance at high temperatures region. These materials with the above said characteristics find its application basically in the areas of Environmental Control System (ECS) and Power plant system of an Aircraft. Bleed air tapped from Engine with High Temperature for Environmental Control System to provide cooling for Cockpit and avionics equipment, basically which needs Inconel or Stainless Steel Duct/ Pipe line for Bleed air tapping. And the arrestor hook covering are just a few examples of the several places where these materials are used on an aircraft.
Prior forming techniques such as using female tool and rubber press, has its own disadvantages. While forming lot of dent marks and thinning of material around radius of parts were observed that could affect the performance of the aircraft system. In order to eliminate such drawbacks, it is required that the process be a defect free, foolproof and versatile, but still be simple in tool design with low cost and easy to operate .
With the new fabrication method called the Progressive Forming Technique (PFT) it is possible to form ducts and pipes of various complicated shapes without any deviation and defects. The base of tool is designed such that it can be used for any tool with slight modification. The need of female tool is totally eliminated. Parts can be manufactured without high pressure rubber press. A technician of limited capabilities can work with ease also. The forming plates around the tool are designed such that they can be used both to mirror image parts and to provide exact shape without material thinning

around radius and dent marks on parts. The process can be implemented across any industry which requires inconel or steel formed parts.
10. Statement of invention
This invention finds its applicability in the easy, simple, fast and safe way of fabrication of various ducts and pipes of intricate shape of inconel as well as of steel required for an aircraft. The invention may also be used in other industries like Automobiles, etc. wherein the requirement of stainless steel or inconel Ducts and Pipes are envisaged

11. Detailed description of invention

Step 1: make the wooden base, constrain it from three sides by bolting and place the tool over it at appropriate position. Refer Figure2.
Step 2: place the formed plates on both LH and RH side of the tool and match the contours of both tool and plates properly. Refer Figure3.
Step 3: Place the sheet of proper profile on the tool and position it on the tool with the help of tooling holes. Now keep the top LH and RH contour plates above sheet and apply pressure either by fly press or rubber press. Refer Figure 4.

Step 4: Beginning with the topmost plate, shift the plates incrementally from its position below to above the sheet while applying pressure and repeat the process until all the plates are above the sheet. Refer Figure 5.
Step 5: remove the formed part from the setup, check for slight profile deviations and if any such deviation is found, dress the part and trim the extra material. Refer Figure 6.

Claims
We Claim that,
1. The new fabrication process or method called the Progressive Forming Technique (PFT) for forming Inconel and Stainless steel ducts or pipes with various shapes provides an easy, simple and reliable process.
2. PFT is unique process theft uses different thickness of sheets in place of Single solid tool or die.
3. PFT is a process designed such that the same forming plates can be. used to form mirror image parts
4.This process can provide exact shape without dependence of skilled technician.
5.This process can be implemented across various industries using near similar setup.
6.This process helps in avoiding non-uniform wall thickness along radius, deep dent marks, cracks and other quality concerns on parts.