Sheet Metal Forming Deep drawing.

Slides:



Advertisements
Similar presentations
Sheet metal processing
Advertisements

Chapter 5 DRAWING Main contents: Deformation feature of drawing;
ISE 311 Sheet Metal Forming Lab Cup Drawing in conjunction with Section 20.3 in the text book “Fundamentals of Modern Manufacturing” Third Edition Mikell.
Miscellaneous Bending and Related Operations
Introduction DRAWING. It is a process of cold forming a flat blank of sheet metal into a hollow vessel without much wrinkling, trimming, or fracturing.
Fundamentals of Metal Forming Processes
SHEET METAL WORKING PROCESSES
Sheet-Metal Forming.
Manufacturing Engineering Technology in SI Units, 6th Edition Chapter 15: Metal Extrusion and Drawing Processes and Equipment Presentation slide for.
Characteristics of Metals Important in Sheet Forming
Sheet Metal Forming Lecture 6 EMU.
MT-284 MANUFACTURING PROCESSES
Sheet Metalworking Chapter 20- Part 1
Production Technology (IND 006)
Manufacturing Engineering Technology in SI Units, 6th Edition Chapter 16: Sheet-Metal Forming Processes and Equipment Presentation slide for courses,
CHAPTER 6_PART III SHEET METALWORKING
(MT 207) B.Sc (ENGINEERING) LEVEL 2 (Semester 2)
SHEET METAL WORKING.
Deep Drawing. Inportant factors of deep drawing Properties of the sheet ratio of blank dia and punch dia clearance punch and die corner radii speed.
Sheet Metalworking Chapter 20- Part 1
Metal Working Processes
Press Operations & Types of Dies
Sheet Metal Bending.
SHEET METALWORKING ©2002 John Wiley & Sons, Inc. M. P. Groover, “Fundamentals of Modern Manufacturing 2/e”
Manufacturing Processes
Drawing Process.
MSE 440/540: Processing of Metallic Materials
Forming (성형) The sheet is bent or stretched into various shapes by tensile forces in the plane of the sheet. Bending Deep Drawing Stretch forming Roll.
Chapter 17 Sheet Forming Processes (Part 2:Drawing & Stretching) (Review) EIN 3390 Manufacturing Processes Summer A,
SHEET METAL PROCESSES. Introduction Sheet metal is simply metal formed into thin and flat pieces. It is one of the fundamental forms used in metalworking,
ENGR 241 – Introduction To Manufacturing
Chapter 17 Sheet Forming Processes (Part 2: Drawing & Stretching) (Review) EIN 3390 Manufacturing Processes Spring, 2012.
Fundamentals of Metal Forming Metal forming includes a large group of manufacturing processes in which plastic deformation is used to change the shape.
SHEET METALWORKING Bending Operations Drawing
Sheet Metal Forming Processes. Introduction Ratio – Surface Area:Volume is very high for sheet metal process. Plates – thickness > 0.25 inches –Boilers,
© 2011 Su-Jin Kim GNU Sheet-Metal Forming Manufacturing Processes Sheet Metal Forming 판재 성형 Associate Professor Su-Jin KimSu-Jin Kim School of Mechanical.
SHEET METAL FORMING.
© 2008 Pearson Education South Asia Pte Ltd Chapter 7: Sheet-Metal Forming Processes Manufacturing Processes for Engineering Materials Manufacturing Processes.
Chapter 15 Extrusion and Drawing of Metals. Topics Introduction The Extrusion Process Extrusion Practice Hot Extrusion Cold Extrusion Impact Extrusion.
Manufacturing Processes Assoc.Prof.Dr.Kutlay SEVER.
Traditional Manufacturing Processes
1. Overview of Metal Forming 2. Material Behavior in Metal Forming ©2007 John Wiley & Sons, Inc. M P Groover, Fundamentals of Modern Manufacturing 3/e.
ENGR 241 – Introduction To Manufacturing
Drawing – It is a process where a cross-section of solid rod, wire, or tubing is reduced or changed in shape by pulling it through a die.
DTEL 1 UNIT v LECTURE 33 Press working. DTEL 2 DEDICATED DIES AND PRESS WORKING LECTURE 33 Introduction to press working.
R. Wertheim Technion – Israel IWU.Fraunhofer - Germany Introduction to Deformation Processes.
Chapter 16 Lecture 2 Sheet Metal Forming. Figure 16.14a: Major Strain and Minor Strain During stretching in sheet metal, Volume constant –  l +  w +
PRESS WORKING OPERATIONS(SHEET METAL)
SHEET METALWORKING Cutting Operations Bending Operations Drawing
©2007 John Wiley & Sons, Inc. M P Groover, Fundamentals of Modern Manufacturing 3/e SHEET METALWORKING 1.Cutting Operations 2.Bending Operations 3.Drawing.
Industrial Engineering Dep.
WIRE DRAWING: DRAWING Typical drawing processes: 1.Single draft drawing 2.Tandem Drawing - Cold working improves the mechanical properties - Intermediate.
1 Sheet Metalworking Chapter 20- Part 1 Manufacturing Processes, 1311 Dr Simin Nasseri Southern Polytechnic State University.
Shaping operations are generally divided into three groups based upon how the parent metal flows or deforms during the shaping process ,namely Bending.
Metal forming processes
Manufacturing Processes
Sheet Metalworking.
Sheet Metal Forming Lab Cup Drawing in conjunction with “Fundamentals of Modern Manufacturing” Third Edition Mikell P. Groover.
Fundamentals of Metal Forming.
SHEET METAL WORKING.
Visit for more Learning Resources
4. Extrusions Brief introduction
Fundamentals of Metal Forming.
SHEET METAL WORKING.
Chapter 17 Sheet Forming Processes (Part 2: Drawing & Stretching) (Review) EIN 3390 Manufacturing Processes Summer A, 2012.
Manufacturing Processes
MSE 440/540: Processing of Metallic Materials
Chapter 7 Sheet Metalworking Cutting Operations Bending Operations
Presentation transcript:

Sheet Metal Forming Deep drawing

Outline Introduction Mechanics of Drawing Methodology Material and Equipment Defects in Drawing

Deep drawing In Deep Drawing, a flat sheet-metal blank is formed into a cylindrical or box-shaped part by means of a punch that presses the blank into the die cavity. Main products made by this process are: Beverage Cans, Pots and pans Kitchen sinks Automobile panels When the depth of the product is less than its diameter it is referred to as Shallow Drawing. When the Depth is more than that diameter then it is Deep Drawing.

Mechanics of Drawing As the punch proceeds towards its final position, the work piece experiences a complex sequence of stresses and strains as it is formed into its final shape. In step 1, the blank holder force, Fh, is applied and the punch begins to move towards the sheet material. In step 2, the sheet material is subjected to a bending operation. The sheet is bent over the corner of the punch and the corner of the die. In step 3, as the punch continues moving down, a straightening action occurs in the metal that was previously bent over the die radius. Metal from the flange is drawn into the die opening to form the cylinder wall.

Mechanics of Drawing In step 4, As the metal in the flange moves toward the center, it is subjected to the following state of stress: 1- Compression in the circumferential direction (the outer perimeter becomes smaller) 2- Tension in the radial direction 3- A relatively small compression in the thickness direction Since the volume of metal remains constant, and because the circumferential stress is relatively large, the sheet will thicken as it moves in the flange area. (this is why the clearance between the punch and die is higher than the sheet thickness by about 10%) In order for the material to be drawn: 1- Friction between the sheet material and surfaces of the blank holder and die must be overcome. 2- Deformation energy should be provided.

Mechanics of Drawing The downward motion of the punch results in a continuation of the metal flow caused by drawing and compression. Some thinning at the cylinder walls occurs as well. Step 5 shows the completed drawing process.

Deep Drawing Tooling Pneumatic cylinder (3) Guide (3) Blank holder Pins (2) Blank holder Die Punch

Defects in Drawing A number of defects in drawing can occur, which include: (a) Wrinkling in the flange occurs due to compressive buckling in the circumferential direction (blank holding force should be sufficient to prevent buckling from occurring). (b) Wrinkling in the wall takes place when a wrinkled flange is drawn into the cup or if the clearance is very large, resulting in a large suspended (unsupported) region. (c) Tearing occurs because of high tensile stresses that cause thinning and failure of the metal in the cup wall. Tearing can also occur in a drawing process if the die has a sharp corner radius. (d) Earring occurs when the material is anisotropic, i.e. has varying properties in different directions. (e) Surface scratches can be seen on the drawn part if the punch and die are not smooth or if the lubrication of the process is poor.

Defects in Drawing

Key factors in Deep Drawing Properties of the sheet metal The thickness of the sheet The draw ratio The clearance between the die and the punch The corner radii of the die and the punch The blank holder force Friction and lubrication The speed of the punch

Deep drawing of a Beverage Can

End