Week 6:- Clamp Unit & Pin-Clamp Unit Design Challenge

OBJECTIVE

To design 3 different type of clamp units with different riser, Blade and clamp arm. And to Design 1 type of clamp units and pin unit for the given car panel.

Abstract

I have designed different type of Swivel Clamp Units with different risers, blade, clamp arm etc. and By considering a clamping force act at each end of mylars and also Designed a unit which consist of both pin unit and clamp unit By considering a Holding Force for the given Car Panel. Here By considering the fundamentals of Clamp Unit design.

Software

Catia V5

TYPES OF CLAMP UNITS:

1. Power clamp unit.
2. Swivel cylinder clamp unit.

In this project, I have used power clamp unit to design.

2.Swivel cylinder clamp unit

To design any clamp unit the basic thumb rule is to use 3-2-1 principle.

(3-2-1 principle) achieved by clamping & resting:

• The best & most cost effective method of part location is referred to as the 3-2-1 method.
• . Fixtures works on of 3-2-1 principle.
• (3) Minimum: Three locator blocks to establish part plane. Three locators or supports are placed under the work piece. Three locators are usually positioned at the primary locating surface.
• . This restricts two axial movement downward & upward and four radial movements. Together, the three locators restrict six degree of freedom.
• 

As by 3-2-1 method by introducing minimum of 3 clamping & 3 resting blocks will restrict 6 degrees of freedom (DOF) and then 2axial movements and 4 radial movements

And second important component for the swivel type clamp unit is selection of cylinder. according to the usage and space constrains we need to select the cylinder.

It consist of some specific names which can represent the nature and specifications of the cylinders

CKG_1B_63_100Y_SWIVEL _CLAMP_CYLINDER

The above specifications of the Clamp Cylinder are.

CKG-SEROES OF THE CYLINDER

1B -CLEVIS WIDTH AS19.5

63 -BORE SIZE

100 – CYLINDER STROKE IN MM

Y – END BRACKET I.e., DOUBLE KNUCKLE JOINT

Design methodology for the SWIVEL CLAMP ARM. I am starting the design with the first clamp are. Having the name of P001_Z01_ST01_10_00_SWIVEL_CLAMP_UNIT.

Clamp Unit

A clamp unit is one of the units in Fixture design it Is used to hold or clamp the car panel with NC blocks/Mylars/rest by using a pneumatic or hydraulic cylinders.

• Clamps arm, fingers, rest/backup, L-block, shims, risers, pneumatic cylinders are the typical parts od clamp unit.
• Clamp force should be considered while designing clamp unit

Clamp Finger(P001_Z01_ST01_10_01_CLAMP_MYLAR)

• A Finger is an NC Block, which is mounted on the Clamp arm of the cylinder, and will press the car panels towards the rest, so it holds the car panel.

Fig clamp unit

Clamp Arm(P001_Z01_ST01_10_02_CLAMP_ARM)

• A Clamp arm is a bought-out part, to which the movable parts are fixed. In general, a clamp arm is a part of a clamp cylinder.

Fig clamp arm

Clamp Cylinder (CKG_1B_63_100Y_SWIVEL _CLAMP_CYLINDER)

• A Clamp Cylinder is a pneumatic device that works with pressurized air. The Clamp cylinder is used to open and close the parts fixed to the clamp arm fixed to the clamp body. Clamp arms are generally bought out parts.

fig clamp cylinder

Rest Unit(P001_Z01_ST01_10_03_REST_MYLAR)

• Rest unit is used to support the car panel, also it rests the clamping force of the finger with the help of rest mylars.
• Rest unit consist of rest mylars, shims pack, risers.
• Holding force should be consider while designing a rest unit.
• Mostly to avoid excess parts to reduce the weight & to reduce the cost of the fixture unit is combined with the clamp unit.

Fig rest_mylar

Blade (P001_Z01_ST01_10_05_BLADE)

• The plate which connects Riser to the Clamp cylinder is named Blade. This plate plays an important role in building the unit. The plate can be of any shape. But we need to keep in mind that the plate should be as compact as possible.

Fig BLADE

RISER (P001_Z01_ST01_06_RISER)

• The part which is mounted on the base plate and holds a clamp, 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.

Fig BLADE

Bush

it is the part that screw cn be fit in the and it consist of different sizes

Fig Bush

stopper

the stoper guides the clam are not to hit the panel and stop damage the panels

Fig stopper

Rest

• Rest is an NC block, which is fixed to the unit to support the car panel, also it resists the clamping force of the finger, and thus clamps the car panel.

The final design of the clamp u its are

fig P001_Z01_ST01_10_00_SWIVEL_CLAMP_UNIT.

The process for the other 2 clamp units are same

2^nd clamp unit(P001_Z01_ST01_09_00_SWIVEL_CLAMP_UNIT)

2^nd and 3^rd clamp units are almost same due to the feasibility of the component is used

the same clamp but and the riser changed

Fig clamp unit(P001_Z01_ST01_09_00_SWIVEL_CLAMP_UNIT)

Clam unit and Rest unit (P001_Z01_ST01_08_00_SWIVEL_CLAMP_UNIT & PIN _UNIT)

The procedure is same for the clamp unit and pin unit its is the combination of pin unit and clamp unit.

Fig pin unit and clamp unit

Project final images

Fig Complete 3 clamp unit and 1 clamp unit and pin unit with out panel (F.V)

Fig Complete 3 clamp unit and 1 clamp unit and pin unit with out panel (S.V)

Fig Complete 3 clamp unit and 1 clamp unit and pin unit with out panel (ISO)

Fig Complete 3 clamp unit and 1 clamp unit and pin unit with panel (F.V)

Fig Complete 3 clamp unit and 1 clamp unit and pin unit with panel (S.V)

Fig Complete 3 clamp unit and 1 clamp unit and pin unit with panel (ISO)

Conclusion

Hence as per the design was named as (P001_Z01_ST01_00_00) and the 1^st CLAMP UNIT(P001_Z01_ST01_09_00_SWIVEL_CLAMP_UNIT). 2^ND CLAMP UNIT(P001_Z01_ST01_10_00_SWIVEL_CLAMP_UNIT). 3^RD CLAMP UNIT(P001_Z01_ST01_11_00_SWIVEL_CLAMP_UNIT)

And CLAMPunit& PIN unit (P001_Z01_ST01_08_00_SWIVEL_CLAMP_UNIT & PIN _UNIT)

with different types of clamp units,power clamps,reisres,blades,shims,are designed using CatiaV5 Sucessfully