Tool Room Question Paper PDF
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This document is a tool room question paper, covering topics such as mold types, maintenance types, mold elements, measuring instruments, machine types, runner and gate systems, hot runner and cold runner differences, ejection systems, advantages and disadvantages of hot runner systems, cooling channel types, metal hardening methods, mold material, types of heaters, Kaizen, 5S, Poka yoke, and types of fits tolerances. It also includes questions on the use of beryllium copper inserts, electrode materials, HRC hardness, types of plastics, lists of thermoplastic and thermoset materials, and various steel types.
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**Describe the Types of molds.** **Ans -- Two Plate and three plate** **Describe the Types of maintenance.** **Ans -- Preventive maintenance** **Breakdown maintenance** **Predictive maintenance** **Describe the molds Elements.** **Ans -- Locating ring / Top plate / cavity plate / stipper plat...
**Describe the Types of molds.** **Ans -- Two Plate and three plate** **Describe the Types of maintenance.** **Ans -- Preventive maintenance** **Breakdown maintenance** **Predictive maintenance** **Describe the molds Elements.** **Ans -- Locating ring / Top plate / cavity plate / stipper plate / core plate / Spacers / ejector plate / Ejector return plate / bottom plate.** **Describe the measuring instruments with least counts.** **Ans -- Vernier caliper -- 0.02** **Micro meter -- 0.01** **Height gauge -- 0.02** **Types of machines.** **Ans - Convectional Machine** **CNC Machines** **Describe the types of runner and gate system.** **Ans -- Runner Type (Round / Half Round/parabolic /trapezoidal /Rectangle)** **Type Gate (Edge Gate/Tunnel / Submarine (Sub) Gate/Direct Sprue Gate/Tab gate/ Banana Gate)** **Difference between Hot runner and cold runner.** **Ans -- Runner is not heated up (Cold Runner).** **Runner is heated up (Hot Runner).** **Type of Ejection system** **Ans - Pin Ejection.** **Sleeve ejection.** **Blade ejection.** **Stipper Ejection** **Advantage and Dis disadvantage of hot runner system.** **1. Elimination of cold runner and sprue thus savings in resin cost.** **2. Reduction in cycle time due to lower fill and cooling time. In some case time taken to cool cold sprue is more than time required to cool actual part.** **3. Improvement in part quality as there is less pressure drop during part filling. cold runner path reduced or eliminated thus reducing pressure drop.** **4. Melt temperature can be monitored and controlled up to and near to gate point, thus improving the flow of melt into cavity and improving the part quality.** **5. Weld line position can be effectively controlled by using sequential hot runner system.** **High Maintenance cost. (Disadvantage)** **High part manufacturing cost. (Disadvantage)** 10. **Describe the cooling channel types.** **Ans -- Baffle cooling / Bubbler cooling / Thermal pin cooling** 11. **Describe the Metal Hardening methods....?** Ans - Heat Treatment / Flame Hardening / Surface Hardening / Induction Hardening. --------------------------------------------------------------------------------- 12. **Describe the Mould material with Elements.** **Ans - Locating ring (C-45 or Equivalent)** **Top plate (S-50C or Equivalent)** **Core insert (1.2344 ESR)** **Cavity insert (1.2344 ESR)** **Spacer (S-50C or Equivalent)** **Ejector plate (S-50C or Equivalent)** **Guide Pillar (En-31)** **Guide bush (En-31)** 13. **Types of Heaters** **Ans -- Tubular Heater / Band Heater / Cartridge heater / Tube heater / Coil Heater / Ceramic band heaters / mica heaters.** 14. **What is mean by KAIZEN......?** **Ans - Kaizen has come to mean \"continuous improvement.** 15. **Describe the 5s......?** **Sort: Eliminate that which is not needed.** **Straighten: Organize what remains after sorting.** **Shine: Clean and inspect the work area.** **Standardize: Write standards for 5S.** **Sustain: Consistently apply the 5S standards.** 16. **Describe the Poka yoke.....?** **Ans -- Poka yoke menace fool proof system.** **Example -- Sim insert slot on mobile.** 17. **Types of fits tolerance...?** **Ans - Clearance Fit / Interference Fit / Transition Fit** 18. **What is the use of Beryllium copper inserts** **Ans :- Reduced overall cycle time** ** Increased productivity** ** High toughness** ** Less stresses in mould parts** ** Reduces dimensional variation** ** Easily machinable to good finish** ** Improved control of warpage** ** Superior corrosion resistance** ** Excellent tensile strength range** 19. **What are the material using to make Electrodes..?** **Ans -- copper / tungsten / graphite.** 20. **What is HRC hardness full form?** **Ans - HRC is short for Hardness Rockwell C Scale.** 21. **What are the 2 main types of plastics?** **Ans- Thermoplastic and thermoset.** 22. **List of Thermoplastics material.....?** **Ans:- Polypropylene / Polythene / Polyvinyl chloride / Polycarbonate / Polyamide / Acrylonitrile Butadiene Styrene.** 23. **List of Thermoset plastic material.....?** **Ans -- Epoxy / Silicone / Polyurethane / Phenolic / Polyester / Vinyl Ester / Polyimides** 24. **What are the different types of steel?** **Ans- Stainless steel / Tool steel / Carbon steel / Aluminium / Chrome Steel / Alloy steel / Cast iron.** 25. **What is mean by Jig and Fixture?** **Ans- Jigs are tools that hold a cutting tool in place or guide it as it performs a repetitive task like drilling or tapping holes.** **Fixtures, on the other hand, do not guide a cutting tool, but hold a work piece steady in a fixed position, orientation, or location.**
