Analysis Of Armature Die TrialBharat Sharmabharatsharmamech@gmail.com9549867867

Failure of trial

• Armature die trial done on machine 630T.• As we started trial casting stuck up in fix side.• After so many trial of shots, we didn't get succeed.

Every time casting stuck up in fix side.• Different kind of parameters we have trial's.• We have use oil & die lube on sticky area. But didn't

succeed.

Define

• Casting stuck-up in fix side, near gate area.

Gate area

Sp. Gravity Measurement

For ADC-12 Sp. Gravity 2.75gm/mm^3

For ADC-7Sp. Gravity 2.65 gm/mm^3

Analysis•Sp. Gravity does matter in flow of metal in cavity through gate. How it does matter I will explain & prove through a simple calculation.•If I have to design gate for ADC-12 casting normally I consider Sp gravity 2.6-2.7, then

Gate area required as per ADC-12

Total Casting + Over flow weight Specific gravity Fill time Gate Speed

mm² grams gr/cm³ gr/mm³ ms sec m/sec mm/sec

201.01 995 2.75 0.00275 40 0.04 45 45000

If I have to design gate for ADC-7 casting Sp. Gravity 2.55-2.65, then

Gate area required as per ADC-7 Total Casting + Over flow weight Specific gravity Fill time Gate Speed

mm² grams gr/cm³ gr/mm³ ms sec m/sec mm/sec

212.61 995 2.6 0.0026 40 0.04 45 45000

Note: Present gate area 143mm^2

Metrology structure analysisADC-12 Coarse grain

ADC-7 Fine grain

Improvement• As we analyze this casting need large gate to fill as compare to present gate.• As we study that ADC-7 material Sp. Gravity < Sp. Gravity, so let’s try to understand

what it means.

Volume V1 Volume V2 Wt. W1 Wt W2 Then, V1>V2 W1=W2

So, as we seen above relation ADC-7 need more gate area as compare to ADC-12Hence Proved

ADC-7 ADC-12

Thanks