Bar or wire drawing is a deformation process in which the work piece in the form of cylindrical bar or rod is pulled through a converging die. ... Basic difference between bar drawing and wire drawing is the size of bar stock used for bar drawing is large . Wire is a drawn product having less than 5 mm.
What is meant by wire drawing?
Wire drawing is a metalworking process used to reduce the cross-section of a wire by pulling the wire through a single, or series of, drawing die (s). ... Although similar in process, drawing is different from extrusion, because in drawing the wire is pulled, rather than pushed, through the die.
What is the difference between wire and bar drawing?
Bar drawing is meant for large diameter bar and rod, while wire drawing is meant for small diameter stock . Wire sizes of the order of 0.03 mm are produced in wire drawing. Bar drawing is generally done as a single stage operation, in which stock is pulled through one die opening.
What is the difference between deep drawing and bar drawing?
12.4 What is the difference between deep drawing and bar drawing? Answer. Deep drawing is a sheet metal forming process used to fabricate cup-shaped parts; bar drawing is a bulk deformation process used to reduce the diameter of a cylindrical workpart.
What are the advantages of wire drawing?
- Manufacturing wire from rod to a specific size diameter.
- Improving the finished surface and removing scale from the rod.
- Improving tensile strength in the finished material.
- Providing more consistent round shape of the material.
What is meant by tandem drawing?
Tandem drawing is the drawing force of the process through two dies in tandem was evaluated by being compared with the drawing force of a conventional drawing process.
How wire drawing is done?
The wire-drawing process consists of pointing the rod, threading the pointed end through a die, and attaching the end to a drawing block . The block, made to revolve by an electric motor, pulls the lubricated rod through the die, reducing it in diameter and increasing its length.
What are the disadvantages of wire drawing?
The surface roughness of wire drawing is relatively low , but the manufacturing process of CVD coating wire drawing die is complex, and its processing is difficult and cost is high.
What is drawing ratio?
DR is defined as the ratio of the blank diameter to the punch diameter , and LDR is defined as the highest value of the ratio of the blank diameter to the punch diameter that can be drawn out without failure, which can be expressed as follows: (1.1)
What is meant by deep drawing?
Definition. Deep drawing is a sheet metal forming process by which a sheet metal blank is slightly clamped along its perimeter by a blank holder and radially drawn into a forming die by use of a punch .
How do you distinguish between shallow and deep drawing?
Shallow drawing is used to describe the process where the depth of draw is less than the smallest dimension of the opening ; otherwise, it is considered deep drawing. Drawing leads to wrinkling and puckering at the edge where the sheet metal is clamped. This is usually removed by a separate trimming operation.
What is springback in sheet metal bending?
Springback is the elastic recovery of the sheet metal after bending ; it is usually measured as the difference between the final included angle of the bent part and the angle of the tooling used to make the bend, divided by the angle of the tooling.
What is the mathematical equation for the flow curve?
The mathematical equation for the flow curve is defined as Y= K .
What are the disadvantages of drawing?
- Drawing is generally slower than most other mediums. You can’t easily do a wash of value or color, like you can with oils or watercolors.
- You can’t layer colors with pencils like you can with oils or acrylics.
- It’s difficult to correct mistakes.
What is wire drawing efficiency?
The efficiency of drawing work, which is the ratio of uniform work to total work, increased from 10% for 0.07 mm2. mm-2 area reduction at 25 °C to 50% for 0.21 mm2 .
What is meant by wire drawing and tube drawing?
Types of Drawing Process: Wire Drawing, Rod Drawing and Tube Drawing. ... Drawing is a metal forming process used to reduce cross section and increase length of work piece . This process associated with tensile force which distinguishes it from other metal forming processes like extrusion, forging etc.
