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Description :

Explain constructional features, and working of progressive die. Also state the functions of any four parts of progressive die. 

Answer :

Constructional features and Working of Progressive Die:  A progressive die consists of the following parts. 1. Stop 2. Sheet metal 3. Pilot 4. Blanking punch 5. Ram 6. Piercing ... 7. Piercing punch: The function of piercing punch is to produce punched holes into the sheet metal. 

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Description :

Differentiate between Lapping and Buffing process. 

Answer :

difference between Lappin and Buffing process : Sr. No.  Lapping Buffing 1 Lapping is a finishing process in which tool used is called as lap.   Buffing ... , sporting items, tools, store fixtures, commercial and residential hardware and household utensils and appliances.  

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Description :

Describe procedural steps for developing CNC part programme. 

Answer :

Procedure for developing part program There are two methods of part programming: manual part program and computer assisted part programming. Manual part programming: 1. To prepare a part program using the ... . 5. The NC system machines (makes) the part according to the instructions on tape. 

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Description :

Explain absolute and incremental co-ordinate systems, with suitable example. 

Answer :

1. Absolute Co- ordinate system: In Cartesian co ordinate geometry system using absolute measurement. Each point is always specified using same zero of given co ordinate system as shown in fig. It is ... to the system as a distance increment, measured from preceding point. Example:    

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Description :

With neat sketch explain the working principle of CNC machines. 

Answer :

Working Principle of CNC machine:- A CNC machine also has a tape reader or any other input media for entry of the part program. CNC uses the part program in a different manner though there is ... to the reference. These two signals are compared and necessary action is controlled.   Or  

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3 views 1 answer
Description :

Differentiate between conventional machines and CNC machine.

Answer :

Answer: 

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3 views 1 answer
Description :

State the various advantages and limitations of CNC machine. 

Answer :

Advantages of CNC Machines:-  [1] Greater machine utilization. [2] Complex machining operations can be easily done. [3] It gives high degree of accuracy. [4] It requires less inspection. [5] ... tooling cost. 6) Temperature, humidity & dust must be affect machining. 7) Initial cost is high. 

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3 views 1 answer
Description :

Explain how tumbling process is used to clean the surfaces.

Answer :

Tumbling process: Tumbling process is used for removing rust and scale from metal parts. In this dry abrasive (deburring compounds) are effective for removing rust and scale from small parts of ... from the product. Parts configuration and size are the primary limitations of the process 

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4 views 1 answer
Description :

Explain the working principle of galvanizing process. Give its applications also. 

Answer :

Galvanization or galvanisation or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are ... 5. All sort of containers 6. telegraph wire 7. fencing materials 8.Transformer parts

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Description :

State advantages and limitations of honing process. 

Answer :

Advantages: 1. Less complex or low cost fixtures. 2. It is highly accurate. 3. It can be used for both long and short bores. 4. It maintains original bore centerline. 5. Any ... rotated or supported. If the workpiece is thin, even hand pressure may cause a slightly oval hole. 

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Description :

Explain the working principle of resistance welding with neat sketch. 

Answer :

Resistance Welding Process: 1.Resistance Spot welding:  Spot welding is employed to join overlapping strips, sheets or plates of metal at small areas. The pieces are assembled between two ... welding small parts. Butt Welding provides joining with no loss of the welded materials.  

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4 views 1 answer
Description :

Draw neat sketch showing various parts of die set. 

Answer :

Answer: 1. Stop 2.Sheet metal 3.Pilot 4.Blanking punch 5.Ram 6.Piercing punch 7.Stripper 8.die Fig. Progressive Die OR

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4 views 1 answer
Description :

With neat sketch explain the features of oxidizing flame and carburizing flame.

Answer :

Oxidizing Flame: An oxidizing flame is one in which there is an excess of oxygen. The flame has two zones- the smaller inner cone which has purplish tinge, the outer cone or envelop.   Carburizing ... defined inner cone 2) An intermediate cone of whitish colour. 3) Bluish outer cone   

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Description :

Explain the working principle of MIG welding with neat sketch.

Answer :

MIG Welding: Gas-metal-arc welding is a gas shielded metal arc welding process which uses the high heat of an electric arc between a continuously fed, consumable electrode wire and the material to be ... will not combine with metal. Carbon dioxide is most commonly used as it inexpensive.

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Description :

Differentiate between soldering and brazing

Answer :

Answer: Comparison of brazing and soldering

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49 views 2 answers
Description :

Give detail classification of welding. State important factors upon which selection of welding process depends. 

Answer :

Answer: Classification of Welding 1. Arc welding a. Carbon Arc Welding; b. Shielded Metal Arc Welding (SMAW) c. Submerged Arc Welding (SAW) d. Metal Inert Gas Welding (MIG, ... workers 14. Cost of materials 15. Code or specification requirements 16. Mechanical properties desired in joints 

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4 views 1 answer
Description :

Draw neat sketch of compound die, showing various parts of it.

Answer :

Answer:

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Description :

State the functions of the following die accessories: pilots, stops, strippers, pressure pad. 

Answer :

Answer: Functions of die accessories. 1. Pilots: The pilot positions, the stock strip accurately and bring it into proper position for blanking and piercing operations. They act as guides during the ... 4. Pressure pad: It is used for drawing operation for maintaining flat surface of the cup. 

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Description :

Explain blanking and piercing operation performed by press. 

Answer :

Blanking: The blanking is the operation of cutting of flat sheet to the desired shape. The piece detached from strip is known a blank. The metal punched out is the required product and the plate with the ... hole and clearance is provided on the die. Fig. shows punch and die set for piercing.  

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15 views 1 answer
Description :

Draw the neat sketch of fly press. Give the functions of important parts of it. 

Answer :

Answer: OR Functions of important parts of Fly Press. 1. Ram : This is main operating part of the press which works directly during processing of a workpiece. Ram ... : A die is a specialized tool used in manufacturing industries to cut or shape material mostly using a press 

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Description :

Explain press forging with neat sketch. 

Answer :

Press Forging: In press forging, impression dies are used in which partd are made by plastically deforming a metal blank into die avities by slow squeezing action. The forging pressure builds up from the ... they are generally employed for non-ferrous alloys weighting from upto about 135 N. 

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Description :

Give detail classification of forging processes. 

Answer :

Classification of forging processes :  1.Open die forging: a) Hand forging b) Power forging:  i. Hammer forging  ii. Press forging 2.Close die forging: a) Drop forging b) Press forging c) Machine forging

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Description :

Differentiate between open die forging and close die forging.

Answer :

Difference between open die and close die forging:

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Description :

Explain forging process used to manufacture the spanners. 

Answer :

Answer: Forging process used for production of spanner: 1) Fullering -The heated stock is elongated by reducing its cross section in first die.  2) Edging- The metal is redistributed, ... Trimming: Flash is removed   (6) Heat treatment and machining is done as per requirement.   

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Description :

State various advantages and limitations of forging processes. 

Answer :

Answer: Advantages of forging processes  1) Complex shaped parts can be forged 2) Mass production with greater accuracy is achieved. 3) It is very easy to maintain close tolerances. 4) ... cannot be produced by forging. 8) Rapid oxidation of metal surface at high temperature wears the dies 

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Description :

Define forgeability. Name any two materials that are used in forging. 

Answer :

Forgeability: Forgeability can be defined as the tolerance of a metal or alloy for deformation without failure. OR  Forgeability is defined as the ability of a metal to change size and shape when heated to ... 10) Tantalum alloys 11) Molybdenum alloys 12) Tungsten alloys 13) Beryllium.

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Description :

Give the classifications of CNC machines according to number of axes. 

Answer :

Answer: Classification of CNC machines according to number of axes 1. 2 axes CNC Machine 2. 3 axes CNC Machine 3. 4 axes CNC Machine 4. 5axes CNC Machine

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Description :

List any four G codes, give their meaning.  

Answer :

Answer:

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Description :

List various surface cleaning processes. 

Answer :

Answer: Surface cleaning processes I. Chemical Cleaning a. Solution b. Saponification c. Emulsification d. Dispersion e. Aggregation Depending on cleaning fluids used, types of chemical ... . Power brushing e. Machine polishing & buffing III. Ultrasonic cleaning IV. Flame cleaning 

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1 view 1 answer
Description :

List various types of flames used in gas welding. 

Answer :

Answer: 1. Neutral Flame 2. Oxidizing Flame 3. Carburizing Flame 

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3 views 1 answer
Description :

State any four applications of resistance welding. 

Answer :

Answer: Applications of resistance welding: 1. Resistance welding is widely used in automotive industries. 2. Projection welding is widely used in production of nut and bolt. Projection welding is ... welding is applied in manufacturing of wheel rims, wire joints and railway track joints etc. 

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3 views 1 answer
Description :

Enlist the different materials used in press work for automobile application. 

Answer :

Answer: Materials used in press work  1) Aluminium, 2) copper, 3) brass, 4) mild steel, 5) Galvanized iron (G.I) sheets, 6) Duralumin, 7) Y-alloys, 8) naval brass, 9 ... ) Babbitt metal, 11) stainless steel & its alloys, 12) Different types of steels & its alloys.

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3 views 1 answer
Description :

State different methods by which forged components can be made. 

Answer :

Answer: Different types of forging method - I. Open die forging: a) Hand forging b) Power forging: i. Hammer forging ii. Press forging II. Close die forging: a) Drop forging b) Press forging c) Machine forging OR

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Description :

(i) Compare Open Die Forging and Close Die Forging. (ii) Explain with neat sketch process of Drop Forging.

Answer :

(i) Difference between Open Die and Close Die Forging: (ii)Drop Forging  Drop forging is carried out by using drop hammers. They are board or gravity hammer, air lift hammer and power drop ... of upper and lower dies. The ram is fastened to the lower end of vertical hard wood board.

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5 views 1 answer
Description :

State the principle used in Lapping. List four applications of Lapping.

Answer :

Principle of Lapping: Lapping is basically an abrasive process in which loose abrasives function as cutting points finding momentary support of the lap. The process has the following features. (a) Use of ... roller bearings ii. Gears iii. Piston rings iv. Slip gauges v. Crankshaft.

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3 views 1 answer
Description :

Draw and explain axis configuration as per ISO, for horizontal spindle CNC machines.

Answer :

Axis Configuration for Horizontal Spindle CNC Machines: The first axis to be identified is the Z axis. This is then followed by the X and Y axes respectively. Z Axis and ... are in the directions which advance right-hand screws in the positive X, Y and Z directions respectively.  

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Description :

Explain any four reference position used on CNC machines. 

Answer :

Reference Positions used on CNC Machine: There are Four reference positions on CNC machine: 1. Machine zero point 2. Work zero point 3. Tool home position. 4. Parking Position 1. Machine Zero Point: ... to move out of the way (usually to the back of the machine) after a job has completed. 

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Description :

Name the various tools used in CNC turning centre. Explain any one in detail.

Answer :

Tools used on Turning Centre: 1. External Turning Tools: 2. Boring Bars:   3. Drills:   4. Threading Tools:   5. Parting Tools:   A. On the Basis of Cutting Tool Construction: ( ... (HCS). (c) Cast alloy. (d) Cemented carbide. (e) Ceramics. (f) Boron Nitride. (g) Diamond. 

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Description :

Describe incremental programming method with suitable example.

Answer :

Incremental programming methodIn Cartesian co-ordinate geometry system using incremental measurement. Each point is always specified using the path differential from the preceding point position. So in such a ... applied to the system as a distance increment, measured from preceding point.

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Description :

Differentiate between CNC and DNC machines.

Answer :

Differentiate between CNC and DNC machines: S. N. CNC DNC 1 In CNC, Far off controlling of operation is not possible DNC facilitates far-flung control  2 ... DNC now not only controls the equipment; however, also serves as a part of administration statistics system.

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Description :

Classify CNC machines.

Answer :

Classification of CNC machines. A. According to control loop feedback system: 1) Open - loop system 2) Closed - loop system B. According to type of tool motion control system: 1) Finite ... D. According to type of controller: 1) NC based controller system 2) CNC based controller system

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Description :

Name four component of CNC machine and write their functions.

Answer :

Components of CNC machines The various components of CNC system are :- 1) Program Input Device:- It is the medium of transmitting the part program to the computer. Three commonly used program input ... to facilitate a two way communication between the user, CNC system and the machine tool.

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Description :

Explain micro finishing process used to correct hole geometry in component.

Answer :

Honing Process (micro finishing process): To correct hole geometry in component, honing is used as a micro finishing process. Honing is an abrading process used mainly for finishing round holes by means ... operation of this process, to flush away small chips and to keep temperatures uniform.

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Description :

Describe Abrasive blast cleaning process with neat sketch.

Answer :

Abrasive Blast Cleaning (Blasting): This method is widely used for removing all classes of scale and rust from forgings, castings, weldments, and heat treated parts. Depending on the finish ... and other material are removed, providing an excellent surface for bonding final finishes.

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Description :

Compare Electroplating and Galvanizing.

Answer :

Comparison of Electroplating and Galvanizing process: 

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Description :

Explain TIG (GTAW) welding process with neat sketch.

Answer :

Tungsten Inert Gas Arc Welding (TIG, GTAW): It is a welding process, in which heat is generated by an electric arc struck between a nonconsumable tungsten electrode and the work piece. The weld pool is ... produces a high quality weld of most of metals. Flux is not used in the process.  

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11 views 1 answer
Description :

Sketch and explain a progressive die used to make washer.

Answer :

Progressive Die: In a progressive die two or more operations are performed simultaneously at two or more stations with each press stroke by mounting separate sets of dies and punch. The metal is progressed ... locate it while the blanking punch descend and shear the plate to form a washer.  

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Description :

List types of welding flames used in Oxy-acetylene welding. Write their characteristics and applications.

Answer :

Types of Flames: Characteristics Applications. 1)Neutral Flame: When oxygen and acetylene are supplied to the torch in nearly equal volumes, a neutral flame is produced. It has two ... cone of whitish colour. 3) Bluish outer cone High Carbon Steel, non - ferrous alloys,

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11 views 1 answer
Description :

Classify welding processes.

Answer :

Classification of Welding Process Depending on method of heat generation American welding society classifies welding as A. Arc Welding 1) Carbon Arc Welding; 2) Shielded Metal Arc Welding (SMAW) 3) ... . Thermit Welding (TW) F. Electron Beam Welding (EBW) G. Laser Welding (LW) 

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Description :

Explain with neat sketch method of welding used in manufacturing sheet metal roofs and doors of automobiles. 

Answer :

Method of Welding Used in Manufacturing Sheet Metal Roofs and doors of automobiles: MIG Welding: Gas-metal-arc welding is a gas shielded metal arc welding process which uses the high ... mixtures) which will not combine with metal. Carbon dioxide is most commonly used as it inexpensive.

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