WELCOMESUBMITTED BY:-Nishant Kumar (13162028)Pawan Beniwal (13162037)

Raw material used STEEL, produced from mined iron ore, the base raw

material, is perhaps the most widely used component in auto manufacturing.

What is SKIN PANEL ?SKIN PANEL is a visual outer body of a vehicle majorly CABIN parts…… Proper metal finished skin panels are very important for good ASTHETIC LOOK of a vehicle…….

DOST

Manufacturing of Skin Panel Skin panels are manufactured with the help of stamping dies. .  The dies can be for manual loading press, tandem press lines with robots, transfer lines or coil feed high speed blanking lines.But in Ashok leyland tandem press lines with robots is used.

The machine used in this press line if of FAGOR company. It presses the skin panel at 670 KN .

Basically DOST model has 14 SKIN PANELS.

Each panel is identified by a Part No.

All panels are stamped(pressed) in ASHOK LEYLAND press shop.

Sheet metal thickness ranges from 0.7mm to 1.6mm.

INTRODUCTION

The 14 skin panels of DOST are1) Door outer RH 2) Door outer LH 3) Door inner RH 4) Door inner LH 5) Roof 6) Floor 7) Front Panel 8) Sill outer RH 9) Sill outer LH 10) Corner Panel RH11) Corner Panel LH12) Back Panel13) B Pillar RH14) B Pillar LH

Front panel of DOST

Left hand door of DOST

INSPECTION OF SKIN PANEL

1. Visual inspection is popular way of inspecting skin panels. 2. Manually inspecting by wearing inspection Gloves3. CMM is used in some critical areas4. Oil stoning the panel with Oil stone.

MAJOR DEFECTS ON SKIN PANEL1. DENTS : Dent refers to

shallow deformation on the surface of a panel or object.

Reason : 1. Due to some dust &

foreign particles on die surface.

2. Rarely during loading and unloading of panel.

DENTS MARK

2. PEAKS : Peak refers to a high point on the surface of a panel or object.

Reason :1. Dust & foreign

particles on die surface.

2. During loading & unloading of panel. PEAKS MARK

3.WRINKLE : • Wrinkle refers to waviness formed on surface of panel.• Wrinkle can also be known as high and low areas. Reason : 1. Low cushion pressure. 2. Varying Cylinder forces.

4.WELDING DAMAGE : Welding damage means spot damage. which may damage the channel, flange. Reason :1. Due to mislocation.2. Urgency.3. Due to Child part defect.4. Weld burning, blackening.5. Due to high current value.

5. CRACKS :Crack is a thin & narrow opening in a flat, solid material. Before crack THINNING occurs.Reason : 1. Due to more

holding, blanking pressure.

2. Slug mark.

Tools used for inspection1. HanThe most important tool for inspection is OIL STONE.2. d Gloves.3. Taper Scale.4. Pin point micrometer.5. Vernier Caliper. 6. CMM(Coordinate Measuring Machine).7. Flash light.

OIL STONE VERNIER CALIPER TAPER SCALE

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