Week 10 - Challenge 1- Attachment Feature Creation (Ribs & Screw Boss)

AIM :

DOOR HANDLE CREATING RIB FOR THE DRILL HANDLING DOOR CREATING SCREW BOSS

CRATED RIB AND DRILL HANDING DESIGN CONSIDERING IN DESIGN RULES .

INTRODUCTION Ribs and screw bosses are engineering features which are created on the b side of the plastic components . RIBS are used to strengthen the walls of your mould with out ..

RIBS:

RIBS ARE USED TO STRENGTHEN THE WALLS OF YOUR MOULD WITHOUT INCREASING WALL THICKNESSES WHICH MEANS THAT YOU MINIMISE THE PROBLEMS THAT COME INTO PLAY WHEN THE WALL THICKNESSES HAVE TO BE INCREASED .

IN ESSENCE , IF THE WALL IS TOO THICK , WARPING AND SINKING CAN RESULT SO THAT THE ENTORE DESIGN MAY NEED TO BE REJECTED .

SCREW BOSS :

BOSS FEATURES ARE COMMONLY FOUND IN INJECTION MOLDING DESIGNS . THEY ARE USED TO AID IN THE ASSEMBLY OF MOLDED PARTS BY PROVIDING A CHANNEL FOR A SCREW . DESIGNING PLASTIC SREW BOSSES IS FAIRLY STRAIGHT FORWARD BUT THERE ARE A FEW CONSIDERATIONS TO ENSURE A STONG CONNECTION BETWEEN PARTS AND MITIGATE COSMETIC DEFECTS.

• BOJECTIVE :
• CREATE TOOLING AXIS FOR THE GIVEN CLASS-A SURFACE .
• CREATE THE CLASS B AND C SURFACE OF DRILL HANDLE USING THE GIVEN CLASS -A SURFACE.
• CREATE FINAL SURFACE MODEL AND CONVERT IT INTO SOLID BODY USING CLOSE COMMAND IN THE PART DESIGN WORK BENCH .
• CREATE RIBS AND SCEW BOSSES ON THE B SURFACE BY CONSIDERING THE DESIGN RULES .
• PERFOM DRAFT ANALYSIS FOR BOTH CLASS A SURFACE AND FINAL PART BODY .

DESIGN METHODOLOGY

CLASS -A SURFACE MEANS VISIBLE SURFACE . IT GIVES THE AESTHETIC OF THE COMPONENT WHICH IS CREATED BY THE STYLING TEAM AND GIVES TO THE PART DESIGN ENGINEER TO CREATE THE PART WITH ALL ENGINEERING ASPECTS .

CLASS A SURFACE :

TOOLING AXIS :

ARRANGE THE VIEW MANUALLY TO CHECK THE BEST TOOLING DIRECTION WHICH COVERS MOST OF THE SURFACES.

TOOLING DRICTION ALONG Y AXIS CAN CLEAR MOST OF THE SURFACES . SO WE CAN CREATE TOOLING AXIS ALONG Y DIRECTION .

I HAVE CREATED TOOLING AXIS USING NORMAL TO THE SURFACE METHOD . FOR THAT EXTRACT APLANE SURFACE AND CREATE A MID POINT ON IT .

CREATE A LINE ON THE POINT AND DIRECTION ALONG Y AXIS .

CLASS -B SURFACE CREATION :

CLASS -B SURFACE MEANS THICKNESS OF A PART IT IS NOT VISIBLE AND IS INSIDE PART . IN OTHER WORS, CLASS - B SURFACE IS A SURFACE BELOW A CERTAIN THICKNESS FROM THE CLASS -A SURFACE . THIS IS THE SURFACE THAT CONTAINS ENGINEERING ASPECTS OF A MODEL .

OFFSET THE CLASS -A SURFACE ABOUT 2.5MM INWARD DIRECTION .

WORK ON THE PATCHES CREATED ON THE OFFSET SURFACE WITH THE HELP EXTRACTED CURVES AND MULTI SECTIN SURFACE FEATURES.

WE CAN JOIN THE WORKING SURFACE AND CHECK FOR THE CONTINUITY .

C SURFACE :

INITIALLY , T EXTRACTED THE EDGES OF THE CLASS A SURFACE WITH TANGENT CONTINUITY BY USING THE MULTIPLE EXTRACT COMMAND AFTER EXTRACTING THE CLASS A SURFACE EDGES CRRECTLY , I SWEEPED THE EXTRACED EDGES WITH 93 DEG TOWARD THE CLASS B SURFACE. AFTER SWEEPING THE EXTREACTED CLASS A SURFACE EDGES , T EXTRAPOLATED THE EDGES OF THE SWEEP FOR 2MM TO INTERSECT THE SWEEP EDGES WITH EACH OTHER. NOW I TRIMMED THE EXTRAPOLATED SURFACE TOGETHER TO CREATE A COMPLETE SWEEP SURFACE TOWARS THE CLASS B SURFACE . I JIONED BOTH THE TRIMMED SWEEP SURFACE AND CLASS A SURFACE TOGETHER , TO GET THE CLASS A+C SURFACES AS A SINGLE SURFACE . NOW , TO CREATD A SOLID BODY FOR THE DOOR HANDLE WE NEED A CLOSED SUFACE . I TRIM THE CLASS B SURFACE WITH JOINED CLASS A+C SURFACE TO MAKE THE CLOSED SURFACE OF A DOOR HANDLE .

A+C SURFACE JION AND B SURFACE TRIM

CLOSED BODY :

CREATING SOLID BODY :

TO CREATE THE SOLID BODY I USED THE CLOSED SURFACE COMMAND IN THE PART WORKBENCH . CLICK ON THE CLOSED SURFACE IN THE PART WORKBENCH AND GIVE THE CLOSED SURFACE ASAN INPUT TO CREATE THE SOLID PART BODY .

RIB CREATING :

TO CREATE THE RIBS ON THE SOLID PART BODY , WE NEED TO FOLLOW THE ABOVE -MENTIONEDD DESIGN GUIDELINES. INITIALLY , I CREATE A LINE SKETCH FOR THE RIB AND I EXTRUDED IT IN THE TOOLING AXIS DIRECTION AND I THICKEN THE EXTRUDED SURFACE TO 1.2MM TOWARD THE INSIDE ,

AFTER THICKENING THE EXTRUDED SURFACE T GAVE 0.5DEG OF DRAFT ANGLE TO THE RIB , AND I UNION TRIM THE RIB WITH THE PART BODY TO REMOVE THE EXTRA SURFACE OF THE RIB , BY UNION TRIMMING THE RIB WITH THE PART BODY THE RIB GETS ADDED TO THE MAIN PART BODY WITHOUT THE UNWANTER EXTRA PART . AFTER ADDING THE RIB TO THE PART BODY, I GAVE THE FILLET TO THE RIB WITH A RADIUS OF 0.25MM ( AS PER THE DESIGN PARAMETERS 0.25MM IS THE MAXIMUM FILLET RADIUS). FOR RIB -2, I USE OFFSET COMMAND FOR OFFSETIN THE EXTRACT AND SAME PROCESS AS ABOVE TO THICKKEN.

SCERW DESIGN CREATING :

FINALLY DRILL HANDLING WITH RIB AND SCREW BOSS :

ALL VIEW :

FRONT VIEW :

TOP VIEW :

SIDE VIEW :

LEFT VIEW :

ISMETRIC VIEW :

DRAFT ANALYSIS OF DOOR HANDLING :

TREE STRUCTURE :

CONSLUSION:

THE TOOLING AXIS AND THE SOLID CAT PART WITH B SIDE FEATURES IS CREATED FROM THE GIVEN CLASS A SURFACE AND DRAFT ANALYSIS IS PERFORMED.