MOLD DESIGN, SLIDERS & EJECTION PINS CREATION FOR TABLE FAN BASE USING SOLIDWORKS

MOLD DESIGN, SLIDERS & EJECTION PINS CREATION FOR TABLE FAN BASE USING SOLIDWORKS

In this report mold design, creation of ejection pins and sliders for table fan base was done by creating each individual part in assembly workbench following step by step process to attain best results.

As there was the necessity of the sliders for the model, we should create washers for the sliders.

Assuming the material for the model as ABS (shrinkage - 0.6%), the scale value is determined as (0.6/100) + 1=1.006 for the model.

MODEL

The steps followed and commands used for the core and cavity blocks creation are:

MOLD TOOLS

• Mold Pull direction:

The direction in which the core moves apart from the mold, based on the models and the features in the model the direction of pull is determined

• Draft Analysis:

Analyse draft angles of faces based on mold pull direction for moment of core and cavity blocks.

• Draft Analysis for Slider:

Analyse draft angles of faces based on slider direction for moment of slider.

• Draft Creation:

The minimum draft should be 0.5 degrees, if there was no draft certain draft will be provided to the component.

• Scale:

Scales the model by a specified factor based on the material provided (Shrinkage factor)

• Parting Line:

Parting line separates the core and cavity surfaces.

• Shut of Surfaces:

Create mold shut off surfaces, it prevents the flow of injected material by creating shut off surfaces.

• Parting Surface:

Create parting surfaces between core and cavity surfaces.

Core & Cavity Blocks:

The Core and cavity block are created as individual parts in assembly by inserting the component as Core and cavity surfaces created for table fan base.

Core

The core block is created using the core surface created which is created before considering the ejector pins.

Cavity

The cavity block is created using the cavity surface created which is created before considering the ejector pins.

The steps followed and commands used for creation of ejection pins on core block are:

The Ejector pins will be present only on the core side, they will be near the ribs at a distance of minimum 1 mm.

• Sketch:

The sketch is created on one of the suitable faces of core block, circles of diameter 3mm (standard)

• Core:

It is used for extracting cores from existing tooling split, using this command ejector pins will be created.

• Providing Relief:

To provide relief for the ejector pins a sketch with circle of diameter 3.95mm (Standard for 3mm diameter ejector pins) will be created on the same face used for creation of sketch of ejector pins.

• Extrude Cut:

The sketch created for providing relief will be cut extrude from an offset distance of 10mm (Reference table) from the face used for sketching along the length of ejector pins.

During mold design of Table fan base in the step of draft analysis we can clearly observe an undercut is present, to optimise the undercut sliders will be used.

Slider direction will be perpendicular to the direction of the pull which will be horizontal and these are separable from the core and cavity blocks as the sliders are movable, they should have a base for the movement form the model we can easily provide a base while creating the blocks itself, and as the undercuts will be the holes the sliders are designed in a manner that they will be able to close the holes with an extruded shape of the holes.

The commands and steps involved in the creation of slider are:

SLIDER CREATION:

The commands used for creation of sliders are:

• REFFERENCE PLANE:

This command is used to create a plane, axis.

• SKETCH:

Using this command, we can create a new sketch.

• CONVERT ENTITIES:

It is a tool available in sketching workbench to project the sketch selected on the plane you are sketching and in this tool another option of intersection curve is there which is also used to project sketch.

• SPLIT:

It is available in features tab used to split the body in two pieces along the sketch based on applications.

• FILLETS

It is used to make fillets to edges of solid bodies.

• RECTANGLES:

It is also an entity used and available in sketching workbench to create a rectangle of different types like corner rectangle, centre rectangle, 3-point corner rectangle, 3 point centre rectangle and parallelogram based on their applications.

• CUT EXTRUDE

It is available in features tab used to remove material from a solid body along the sketch in which direction, we need based on applications.

• EXTRUDE BOSS

It is available in features tab used to add material from a solid body along the sketch in which direction, we need based on applications.

• MOVE FACE

It is available in mold tools tab used to move faces of a solid body.

• MOVE/COPY BODIES

It is available in mold tools tab used to moves, copies and rotate solid and surface bodies.

• COMBINE

It is available in mold tools tab used to add, subtract bodies.

• DELETE/KEEP BODY

It is available in mold tools tab used to keep or delete a solid body or surface body.

The sliders are created using the split option making the sketch as the profile of the undercut and the plane on which sketch is made.

These sliders are modified such that washers and locking mechanism will be correctly designed.

The core and cavity blocks are modified according to the shape of the slider after all modification of sliders using the combine command.

Washers and bolts are designed beside the slider base for this separate space is assigned on the blocks while modifying the blocks after slider design.

The final mold design with sliders and ejector pins created will be.