Pin Unit Design

AIM :

To study about the various design aspects regarding BIW fixtures.

OBJECTIVE :

• To design different types of Fixed Pin Unit with Different Pins, Riser, Blade, and Block.
• To design different types of Retractable Pin Unit with Different Pins, Riser, Blade, Cylinder, and Block.

Fixed Pin Unit

The Fixed pin unit is designed to locate the car pannel using different types of pins.

The various parts of a fixed pin unit are as follows,

• Pin
• Pin Reatainer
• Shims
• Block
• Blade / Adaptor plate
• Riser

Pin

• Pin should have grinding surface on shaft with fits on to which the pin retainer will be fitted
• The mounting surface of the pin should be a fine machined surface.
• The pin should have a step machine surface to lock the rotation, which matches with the pin retainer
• The mounting surface of the pin retainer to the blocks should be a machined surface. A
• All machined planes should be perpendicular to the axis of the pin shaft.
• Pin must have a fastening provision like tapped hole from the bottom or a V grove from the side
• A pin must be hardened (Heat treatment) and black oxide finished in general.

The two types of Pin units used were,

• Circular Pin
• Diamond Pin

Pin Reatainer

Pin Reatainer is a part which holds the pin in place.

It restricts the rotation of the pin mounted on it.

It can either be a make part or a standard part.

• Pin reatainer must contain a hole in it in order to mount the pin.
• The surface on which the pin is mounted must be a machined surface.
• It must contain a step to lock the rotation of the pin.
• The surface which is mounted with the blocks must be machined.
• It can be fixed with the riser using a block.

Shims

• Shims are used foe the adjustment of the locators.
• In generaal these are standard parts.
• Shim blocks can be adjusted according to the manufacturing deviations.

Block

• Blocks are generally used to accommodate the shimming directions.
• It is also used for the ease of design.
• Blocks can be of L shape.

Blade / Adaptor plate

• Blade is the part which is used to connect the entire unit with the riser block.
• It can either be a make part or a standard part.

Riser

• Riser is the part on which the all the units are mounted.
• It provides support to the unit and attaches itself to the base.
• It can either be a make part or a standard part.

Retractable Pin Unit

The Retractable pin unit is designed to locate the car pannel using different types of pins.

It differs from fixed pin unit with the use of pneumatic cylinders.

The Pin unit will be mounted on the Cylinder.

It contains the same components as that of the Fixed pin unit except the cylinder.

Pneumatic cylinder

Pneumatic cylinders help in the opening and closing of the pin unit, which helps in the mounting process.

The two types of pneumatic cylinders used here were,

• Single rod retractable cylinder
• Double rod retractable cylinder

Single rod retractable cylinder

Double rod retractable cylinder

MODEL RESULTS :

Feature tree

Car pannel

Fixed Pin unit with Circular Pin

Fixed Pin unit with Diamond Pin

Fixed Pin units with Car pannel

Retractable Pin unit with single rod

Retractable Pin unit with double rod

Retractable Pin units with Car pannel

CONCLUSION

• The Fixed Pin unit was created with proper design methodologies.
• The Retractable Pin unit was created with proper design methodologies.
• Necessary images and part files were attached.