Hood design-Week 2

The report for the above challenge is as follows :-

Creation of Inner pannel

• First given outer panel is split in equal half so that we can make it working surface.
• The split half surface is offset to 1.7 mm as per given master section and then with the help of 3D project curve the outer face is offset to 20mm.
• Then the created offset is trimed to obtain the first lower flange.
• The split half surface is again offset to 22mm and curve offset to 35mm and then trimed to obtain second flange.
• The same operation is repeated for the lower most surface with offset of 25 mm and 50 mm offset curve.
• Now with the help of through curves the flanges are connected together and then with the help of sew command the surface are joined together and given edge fillets are applied.
• Now with the help of 3D offset curve, a curve is projected and sketch is done and with the help of emboss coammnd the created sketch is formed into emboss of 10mm.
• On the formed emboss other embosses are created which can be joined to the outer panel.

Reinforcement creation.

• A datum plane is selected for the sketch on the bottom of the created emboss.
• With the help of setch tools different emboss sketch are created. Now the created skecth are formed into emboss of 8.5 mm and proper fillets are provided.
• Now on the emboss outer curve is projected and circle of 80mm and 10mm are created and then trimed accordingly, the 10mm circles are the mastic points on the reinforcement which has 80mm influence of strength on the outer pannel.
• Then with the help of mirror coammand the other half is mirrored and then sewed to obtain the inner pannel.

Hinge assembly

• First flat surface emboss has to be created to place the hinge, for which a datum plane is created at an angle of 10 degrees and offseted close to the inner panel.
• On the datum plane sketch is done and flat emboss is created of height 2mm
• The given hinge assembly is impoterted to the main assembly and activated to work.
• With the help of allign constrains the hinge is alligned with the x axis.
• Now with the help of move command it is moved to the required position and then touch constrains is given between hinge and the emboss surface to proper allign it.
• Now the hinge is assembly is mirrored to to obtain the same at other half.

Striker assembly

• The given striker is imported to the main assembly.
• Then adatum plane is defined between the curve of striker and a normal is created in the middle of the striker curve.
• Now two points are marked on the either hinge assemblies and a line is created, then a circle is drawn of dia 620 mm and it is made coinincident with the midpoint of the line.
• Then a tangent line is drawn on the circle and a intersect point is marked. Now from the intersect point a line is drawn to centre of the circle and another parellel line is drawn through midpoint of the previous line.
• Now angular constrain of 79 degree is given to the intersect and parellel line.
• Now the striker is given allign constrain with the intersect line, so that with the varying the angle the striker also moves at an angle which resembles oppening and closing of hood.
• At last the emboss is created for the striker by extracting back face of the striker then using law extension it is extended and then trimed with the inner pannel and fillet are given to obtain the emboss for the striker.
• Finally the striker is given allign and touch constrain with the intersect line and moved at proper emboss location.
• At last with the help of thicken command, thickness is provided to the inner panel of 0.75mm.

Hemming operation

Hemming is a sheet metal forming process in which sheets are joined togther by bending it by 180 degrees. where as deep drawing is a sheet metal forming process in which sheet metal blank is radially drawn into forming a die by the mechanical action of a punch. It is thus shape transforming process with material retention.

The process followed for hemming is as follows.

• Intially the given outer panel is added to the assembly, and then split into half to work on it.
• The split half is offset for 2.65 mm downwords, the offset sheet is then given offset curve for 6mm and then trimed to obtain the shape of flange.
• Now with the help of law extension the outer curve is extended for 3mm to vertically at 90 degrees and then with the help of three face blend curve the flange is bend to form hemming operation.
• Then with the help of curve on face coammnd two curve are created at the corners and then trimmed to form smooth blend.
• The half part is then mirrored to obtain complete hood and then given thickness of 0.75mm.

Finally fix constrain is given to the outer pannel and inner pannel and complete assembly is obtained and it is then checked for the proper gap between the innner and outer panel for 5mm and 0.2mm gap between hemming flange.

Thankyou