Description

Technical Field

The present development is related'with Military Aviation Industry more particular to structural assembly of Tejas (LCA) Aircraft.

Background of Invention

For any Tool design of contoured parts require neutralizing of the profile,
Conventional method of neutralizing is done for economical usage of raw material and not for manufacturing simplicity.

To make the design for manufacturing simplicity as well as manufacturing simplicity, the neutralizing by best fitted cylinder can be best suited.

a. For any tool Design of contoured parts require neutralizing of the profile,Conventional method of neutralizing is done for economical usage of raw material and not for manufacturing simplicity.

b. Lug holes are required for contour sheet metal part (doors and covers) for forming reference and for subsequent usage of the formed part on Assembly.

More than 90 % of the sheet metal form blocks are machined on 3 Axis machine. (With ball nose cutter).
On three axis machine, lug holes drilled on the form block will be normal to the base (Bed) and not necessarily normal to the contour and thereby the hole become elliptical and reference for further usage will not be feasible.

To make the design for manufacturing simplicity, lug hole finalising as well as economical usage, the neutralizing by best fitted cylinder can be best suited for the design of the form block (sheet metal )/Layup tool(for composite parts) and subsequent usage oh Assembly and design of Master model for making drill template for panel.

Summary of invention

A cylinder is best fitted on to the contour surface and the fitted cylinder axis is taken as reference for further 1. design of form block, 2. lug hole finalizing, 3. master model design and 4. Calculation of development length for the contour parts (allied benefit) using the neutral axis.

Process details description

1. The panel on the Aircraft look like this.

2. Take a set of 5 to 6 sections and create a set of points on to the section curve.

3. A cylinder is fitted.

4. Repeat the step 1 and step 2 and get a iterated fitted cylinder

5. Using the Axis of the cylinder and fitment of axis system make the form block design. The lug created by this method will normal to the base and normal to contour as well.

6. The model made out of this method can be further used for making the master with simplified angles which will have optimum machining requirement with minimum material usage.

CLAIMS

We claim that :-

1. Simplifying the angle and improve the manufacturing and thereby improving the quality. -

2. Economical usage of Costly imported Raw materials.

3. Lug holes used in detail parts can be taken further as reference to Assembly Locations.