Difference between compound and combination die.

1 Answer

Answer :

Compound die
Combination die
1. Any two cutting operations can be performed at one station.
1. Both cutting and forming operations can be performed at one station.
2. Both operations performed in a single stoke of press
2. Two separate strokes of press. 
3. Jobs produced with high accuracy and close tolerance.
3. Care need to be taken to produce jobs with high accuracy and close tolerance.
4. Blanking, piercing or punching operations are performed.
4. Blanking, drawing, bending operations performed.
5. e.g. washer
5. e.g. drawing cup shaped part.

Related questions

Description : State “Plane washer” making process with use of combination die.

Last Answer : (Note: The plain washers can be produced by using Compound die or Progressive die. It is not possible to use combination die for making plain washers, so consider compound die or progressive die for answer. ... Stop 2.sheet metal 3.pilot 4.blanking punch 5.ram 6.piercing punch 7.stripper 8.die

Description : Explain construction and working of Combination Die with neat sketch.

Last Answer : Combination Die: In this both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram. Figure shows a combination of blanking and drawing die.In this ... as blank holder when the drawing punch descends and draws the blank into the desired shape.

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

Last Answer : Answer:

Description : Explain with sketch construction and application of progressive die.

Last Answer : OR Construction A progressive die consists of the following parts.: 1. Stop 2. Sheet metal 3. Pilot 4. Blanking punch 5. Ram 6. Piercing punch 7. Stripper Plate 8. Die ... such as automotive, electronics and appliances. Example car brake caliper, washer, lid of a beverage can etc.

Description : Describe briefly any two die accessories.

Last Answer : 1. Stops: The stops are used for correct spacing of the sheet metal as it is fed below the punch to give the greatest output in given length of the plate. 2. Pilots: The pilot ... 5. Pressure pad: It is used for drawing operation for maintaining flat surface of the cup   

Description : Enlist die accessories and state function of knock out

Last Answer : Die Accessories are as follows: 1) Stops a)Button stop b) Lever stop 2) Pilot a)Direct pilot b)Indirect Pilot 3) Knock out 4) Strippers a) Fixed stripper b) Spring ... Pad Knock out: The function of knock out is to eject the finished components from the die cavity. 

Description : List the parts of standard die set.

Last Answer : 1)Die 2)Die Block 3)Lower Shoe 4)Punch 5)Upper Shoe  6)Back Up Plate 7)Stripper

Description : Draw a neat sketch of progressive die. 

Last Answer : progressive die

Description : Explain the importance of pressure pads in a die with neat sketch.

Last Answer : Importance of Pressure pad:  It is used for drawing operation for maintaining flat surface of the cup. A pressure pad presses against the material during L bending or U bending, and is used for ... . There is also the purpose of stripping off the material from the punch after forming.

Description : Explain simple die with neat sketch

Last Answer : Simple Die: Simple die or single action dies perform single operation for each stroke of the press slide. The operation may be cutting or forming operation such as blanking, punching, piercing etc. ... are simple in construction and can manufacture by conventional machining processes.    

Description : Explain closed die forging with neat sketch

Last Answer : Impression die & Closed die forging process: Closed Die forging is also known as impression die forging. Close die forging process consist of specially prepared dies to manufacturing forged parts in large ... of accuracy. Complex shaped parts can be easily forged by this forging process.  

Description : State the function of pilot and stopper in a die.

Last Answer : Function of pilot and Stopper: 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 piercing or blanking ... it is fed below the punch to give the greatest output in given length of the plate. 

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

Last 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. 

Description : Draw neat sketch showing various parts of die set. 

Last 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

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

Last 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. 

Description : Differentiate between open die forging and close die forging.

Last Answer : Difference between open die and close die forging:

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

Last 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.

Description : Sketch and explain a progressive die used to make washer.

Last 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.  

Description : Name four die accessories and write their functions.

Last Answer : Die Accessories: 1) Stripper: To remove scrap material from the punch as it cleans the die block. 2) Pilots: The pilot positions, the stock strip accurately and bring it into proper position for ... . 6) Pressure Pad: It is used for drawing operation for maintaining flat surface of the cup. 

Description : Sketch and describe the following press operations: 1. Punching 2. Shearing and 3. Trimming

Last Answer : (i) Punching : In punching operation, a hole is the desired result. The size of hole is determined by the size of punch and clearance is allowed on the die. The figure shows the ... still hot for maximum efficiency; therefore it is usually incorporated into the larger production process.

Description : Describe with sketch the surface treatment process used to built-up worn out metal components of automotive engines.

Last Answer : Metal spraying is to build-up worn out metal components of automotive engines.   Metal Spraying of metalizing literally means to treat with or coat with a metal or metallic compound. Metalizing as ... being coated, by compressed air. A sectional view of metal spraying gun is shown in fig.  

Description : Explain the shielded metal arc welding (SMAW) processes with neat sketch. State its two advantages and disadvantages.

Last Answer : Working  : Shielded metal arc welding uses a metallic consumable electrode of a proper composition for generating arc between itself and the parent work piece. The molten electrode metal fills the weld ... . 2. Weld may contain slag inclusions 3. Fumes make difficult the process control.

Description : Explain the resistance spot welding process with neat sketch. State its two advantage and disadvantage. 

Last Answer : 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 electrodes, which must possess high electrical & thermal ... for making the RSW a success. 4. The thick jobs are not easy to weld. 

Description : Draw neat labeled sketch of ply press.

Last Answer : sketch of ply press

Description : Draw flatter and Fuller. State its use in forging.

Last Answer : 1. Fuller: Use of Fuller: Fuller is a forging tool, used to spread the metal. The fuller is placed against the metal stock, and then either the fuller or the stock is struck ... are used to give smoothness and accuracy to articles which have already been shaped by fullers and swages. 

Description : Explain seam welding process with the help of neat sketch.

Last Answer : Seam Welding is a Resistance Welding (RW) process used for producing continuous joint of overlapping sheets by passing them between two rotating electrode wheels. Heat generated by the electric current flowing through ... the electrodes and cool the work rapidly to speed up the operation.    

Description : List the materials used in press work for automobile components parts with example.

Last 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) Cartridge Brass, ... 8) Carburettor bodies 9) Valves 10) Combustion Chamber 11) Cylinder heads , blocks,  12) Gear box cases

Description : Explain the following press operations (a) Punching (b) Drawing

Last Answer : a) Punching: In punching operation, a hole is the desired result. The size of hole is determined by the size of punch and clearance is allowed on the die. The figure shows the spacing of hole on plate2 ... between punch and die is greater. [5] The drawing operation is illustrated in Fig.  

Description : Explain drop forging with neat sketch. 

Last Answer : Drop Forging Process: Drop forging is carried out by using drop hammers. They are board or gravity hammer, air lift hammer and power drop hammer. Anvil of drop forging hammer is attached to the frame ... [5] This energy will be delivered to the metal work-piece to produce plastic deformation.  

Description : State the meaning of G90, G91.

Last Answer : Meaning of following G-Codes: G90 :- Absolute Dimensioning G91:- Incremental Dimensioning

Description : Define Soldering. Give one application of soldering. 

Last Answer : Definition of Soldering:- Soldering is a method of uniting two or more piece of metal by means of a fusible alloy or metal, called solder, applied in the molten state. Applications of Soldering ... 9. Refrigeration and plumbing machine tools components,  10. Copper foil in stained glass work. 

Description : Give Classification of Presses.

Last Answer : 1. Classification on the basis of source of power. Manual Presses.  Mechanical presses. Hydraulic Presses. Pneumatic Presses. 2. Classification on the basis of number of slides. Single ... - Frame Presses. Gap Frame Presses. Straight Side Presses. Horn Presses. Inclibable Press

Description : Enlist any four forgeable materials.

Last Answer : Following are the forgeable materials; Forgeable Materials:  1) Aluminium alloys 2) Magnesium alloys 3) Copper alloys. 4) Carbon and low alloy steels 5) Martensitic stainless steels 6) ... ) Columbium alloys 10) Tantalum alloys 11) Molybdenum alloys 12) Tungsten alloys 13) Beryllium.

Description : What is interpolation? State its types. Explain linear interpolation with neat sketch

Last Answer : Definition : When the feed rates of individual axis are not constant and they vary continuously through the move it is called interpolation. Following are the types of interpolation: 1. G00- Rapid Traverse 2. ... to clear the job for loading /Unloading N9 M02 EOB  Programme End.  

Description : Explain buffing process with neat sketch. 

Last Answer : Buffing process :- Buffing is used to give a much higher, lustrous, reflective finish that cannot be obtained by polishing. The buffing process consists in applying very fine ... sporting items, tools, store fixtures, commercial and residential hardware and household utensils and appliances. 

Description : State the function of G00, G94, M08 and M30 used in CNC part programming. 

Last Answer : 1) G00 :- Rapid Traverse Function G00 is the basic G-code for CNC programming to initiate rapid motion mode i.e used for quickly positioning the tool. G00 can be used where the tool is not ... production. As soon as the program ends he can place the next component and start the next cycle. 

Description : What are the application of CNC machines?.

Last Answer : Drill press Milling and turning centres Boring machines Surface grinders Manufacturing industries etc.

Description : What are the factors considered while selecting the components for machining on CNC machines?

Last Answer : Following are the factors to be considered in selecting components of CNC machines? 1. High precision and repeatability. 2. Reliability. 3. Efficiency -To meet the requirement of high precision. ... should be such that removal of swarf is easy and the chips do not fall on the slideways.

Description : State salient features of CNC machines.

Last Answer : Salient Features of CNC machines .. 1. A part program can be fed to the controller unit through a keyboard. 2. The part program once entered can be used again and again. That is why ... control unit allows compensation for any changes in the dimensions of cutting tools caused due wear or otherwise. 

Description : List various surface finishing processes. Explain lapping.

Last Answer : List of Surface Finishing Processes: [1] Grinding [2] Honing [3] Lapping [4] Burnishing [5] Buffing [6] Polishing Lapping Lapping is basically an abrasive process in which ... constantly changing. The effective path is of cycloid in nature. Figure shows the lapping process.  

Description : Explain metal spraying process and give two applications.

Last Answer : Metal praying of metalizing literally means to treat with or coat with a metal or metallic compound. Metalizing as a process normally includes the preparation of base material, the spraying on ... Its other applications are in having decorative films, reflecting surfaces and special metal forms. 

Description : Describe in brief the equipments required for oxy-acetylene welding.

Last Answer : The following equipments are required for oxy-acetylene welding. 1. Welding torch or Blowpipe: It is the tool for mixing two gases in the desired volumes and burning the mixture at the end of a ... particularly when the oxides of the base metal have a higher melting point than the metal itself.

Description : Describe briefly soldering and brazing operation.

Last Answer : Soldering: It is a method of joining two or more pieces of metal sheets by means of a fusible alloy or metal , called solder, applied in the molten state. The melting point of the ... by metallic bonding. Copper, Copper alloys, Silver alloys and Aluminium alloys are used for brazing process. 

Description : Name the types of dies used in press work. Explain any one with neat sketch.

Last Answer : The various types dies used in press work are: 1. Types of dies according to operations performed (i) Shearing (ii) Bending (iii) Drawing (iv) Squeezing 2. Types of ... giving output. These dies are simple in construction and can manufacture by conventional machining processes.     

Description : Describe with neat sketch: (i) Spot Welding (ii)Seam Welding

Last Answer : (i) Spot Welding: Spot welding is employed to join overlapping strips, sheets or plates of metal at small areas .The pieces are assembled between two electrodes, which must possess high electrical & ... used to conserve the electrodes and cool the work rapidly to speed up the operation.   

Description : List common equipments used for arc welding process.

Last Answer : 1. A.C. or D.C. machine 2. Electrode (bare or coated) 3. Electrode Holder 4. Cables and its connectors 5. Chipping Hammer 6. Earthing Clamps 7. Wire-brush 8. Helmet 9. Safety Goggles 10. Hand Gloves 11. Apron Sleeves etc.

Description : List various pressed products which are used in automobiles.

Last Answer : The various pressed products used in automobiles are: 1) Gears 2) Crank Shafts 3) Automobile panels 4) Wires 5) Frames and Chassis 6) Connecting Rods 7) Springs 8) Carburettor bodies 9) Valves 10) Combustion Chamber 11) Cylinder heads , blocks  12) Gear box cases etc.

Description : Explain forming and punching operation with neat sketch.

Last Answer : Forming: Forming processes are particular manufacturing processes which make use of suitable stresses (like compression, tension, shear or combined stresses) to cause plastic deformation of the materials to produce ... metal from being lifted along with the punch 3 after punching operation.   

Description : Name the different types of presses used in industry. State the working principle of press. 

Last Answer : Types of presses used in industry: According to Source of power to ram: 1. Crank 2. Cam 3. Eccentric 4. Power screw 5. Rack and pinion 6. Toggle 7. ... ) hydraulic, mechanical, pneumatic and respectively working on principle of Pascal law, Mechanical Pressure and Pneumatic Pressure.

Description : Write down the sequence for manufacturing of crankshaft.

Last Answer : Forging Sequence for Manufacturing Crank Shaft: [1] Stock is redistributed and size is increased at certain place and reduced at other place by roll forging. [2] After preliminary roll forging, stock is ... 5] Then the finished part is then trimmed in blanking die to remove excess metal or flash.