Week 4:- Pin Unit Design Challenge
Week 4:- Pin Unit Design Challenge
Aim :- Design of 2 Fixed Pin Units with different risers, blade, etc. And Design of 2 Retractable Pin Units
with different risers, blade, etc.
Introduction :- there is mainy two tupes of pin units one is fix type pin unit and another one is retractable type pin unit.
in detail mentioned below.
Fix pin unit -
An assembly of standard and manufacturing parts consisting location pin is called Pin unit. A pin unit in which pin’s position
is fix, is called Fixed Pin Unit. Pin unit is used to lock the rotational position of panel. Round Pin is used to control panel in
two directions while Diamond Pin is used to control panel in one direction.
Retractable Pin Unit
Inline Retractable Pin unit consist one Pin cylinder which operates the pin in one direction. In this unit Pin is directly mounted
on the cylinder and it is must to have pin and cylinder inline with the hole or slot of the panel. Pin cylinder is controlled in
two directions with the help of shimming. Below picture is an example of inline retractable pin cylinder.
Main parts of a pin unit :-
Pin -
Pins are used to locking the rotational movement of the panel. Generally there two types of Pins, one is Round
Pin and another one is a Diamond pin. We use two and three-directional shimming for pins as per the angle
of the pin w.r.t. the carline. In some cases, we use a collared pin, when the pin is supposed to support the
panel as well. For this kind of pin, we provide 3 way shimming irrespective of pin angle to the carline.
Pin retainer
Pin Block is also called Pin Retainer. This block holds the pin and restricts the rotational motion of the pin.
Pin Block can be either manufactured one or Standard
Shims
In general, a shim is a thin and often tapered or wedged piece of material, used to fill small gaps or
spaces between objects.
Shims are typically used in order to support, adjust for better fit, or provide a level surface.
Shims may also be used as spacers to fill gaps between parts subject to wear.
Shims are the small parts which comes with the thickness of 0.1mm, 0.2mm, 0.5mm, 1.0mm etc.
Mylar -
Mylar is one kind of block that touches the panel and holds or clamps the panel. Mylars are always
designed in CAR LINE. Mylar is also called NC(Numerically Controlled)Block. Mylars are mounted on
any block or plate with Shimming, So that height of mylar can be adjusted accordingly at the assembly
level. For ‘A’ class surfaces Nylon mylars are used. So that surface can be saved from scratches.
Riser
The part which is mounted on the base plate and holds a clamp or pin cylinder on it, is called Riser.
Riser can be Standard Part or manufactured part, it varies from project to project.
A riser can be a Single part or welded part. Standard risers also have various shapes and sizes.
Design methodologies :-
It is necessary to have two pins to locate a car panel. One pin must arrest 4 ways (4 translational) and the other must arrest
2 ways (2 rotational) of a car panel.
* pin should engage 3 - 5 mm from car part entry surface.
* All pins should be accommodated with 2 ways adjustable shims irrespective of direction of arresting.
* Round pin should be used in case of 4 way arresting of car part if the hole is round.
* Round pin should be used in case of 2 way arresting of car part if the hole is slot.
* Diamond pins can be used for 4 way arresting of car part only if the hole is round.
* Diamond pins can be used for 2 way arresting of car part only if the hole is slot.
Fixed pin unit :-
Retractable pin unit :-
Fixed pin unit - Round pin with L type raiser :-
Fixed pin unit - Dimond pin with T type raiser
Retractable pin unit - Round pin with L type raiser :-
Retractable pin unit - Dimond pin with T type raiser :-
Conclusion :- After complition of this cahllange i woul like to conclude that now i am abale to design 4 types of pin units along
with design standards cosidation.