Assertion (A): Greater force on the plunger is required in case of direct extrusion than indirect one.
Reason (R): In case of direct extrusion, the direction of the force applied on the plunger and the direction of the movement of the extruded metal are the same.
In direct extrusion, friction with the chamber opposes forward motion of the billet.
The rate of production of a powder metallurgy part depends on
Metal extrusion process is generally used for producing
The metal extrusion process is generally used for producing Uniform solid and hollow sections.
Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed through a die of the desired cross-section. The extrusion process can be done with the material hot or cold.
Which one of the following statements is correct?
In parts produced by powder metallurgy process, pre-sintering is done to
Assertion (A): Cemented carbide tool tips are produced by powder metallurgy.
Reason (R): Carbides cannot be melted and cast.
The extrusion process (s) used for the production of toothpaste tube is/are
1. Tube extrusion 2. Forward extrusion 3. Impact extrusion
Select the correct answer using the codes given below:Codes:
Carbide-tipped cutting tools are manufactured by powder- metal technology process and have a composition of
Extrusion force DOES NOT depend upon the
In wire drawing process, the bright shining surface on the wire is obtained if one
Which one of the following processes is performed in powder metallurgy to promote selflubricating properties in sintered parts?
A brass billet is to be extruded from its initial diameter of 100 mm to a final diameter of 50mm. The working temperature of 700°C and the extrusion constant is 250 MPa. The force required for extrusion is
Extrusion constant, k = 250 MPa
Force required for extrusion,
Match List-I (Gear component) with List-II (Preferred method of manufacturing) and select the correct answer using the codes given below the Lists:
Consider the following processes:
1. Mechanical pulverization
3. Chemical reduction
Which of these processes are used for powder preparation in powder metallurgy?
Match List-I (Components) with List-II (Manufacturing Processes) and select the correct answer using the codes given below the lists:
What does hydrostatic pressure in extrusion process improve?
It is pressure induced ductility.
Which one of the following is the correct statement?
In powder metallurgy, the operation carried out to improve the bearing property of a bush is called
Assertion (A): Direct extrusion requires larger force than indirect extrusion.
In Reason (R): indirect extrusion of cold steel, zinc phosphate coating is used.
Both A and R are true but R is not correct explanation of A. Zinc phosphate coating is
used to prevent metal contact
Which one of the following processes is the wiredrawing process?