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PowerPoint ® Presentation Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Powder Metallurgy Primary Forming Processes Secondary Forming.

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Presentation on theme: "PowerPoint ® Presentation Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Powder Metallurgy Primary Forming Processes Secondary Forming."— Presentation transcript:

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2 PowerPoint ® Presentation Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Powder Metallurgy Primary Forming Processes Secondary Forming Processes Machining Grinding

3 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Powder metallurgy (P/M) consists of several steps.

4 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Compacting consolidates and densifies the component for transportation to the sintering furnace.

5 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Cold isostatic pressing is performed at room temperature with liquid as the pressure medium. Hot isostatic pressing is performed at elevated temperature with gas as the pressure medium.

6 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding A macroetched section through a forging indicates that the grain flow follows the contour of the component, which often maximizes strength in the direction of greatest operating stress.

7 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding In impression die forging, the workpiece is shaped within the cavities of two dies that come together to completely enclose it.

8 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Roll forging is used to produce components with long, symmetrical sections, often with a slight taper, by forcing the workpiece between two matched and grooved rolls that rotate in opposite directions.

9 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Upset forging is used to gather a large amount of material at one end of a bar, such as in the forming of a wrench socket.

10 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Ring rolling is the shaping of seamless rings by reducing the cross section and increasing the circumference of a donut-shaped blank.

11 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Rotary forging requires significantly less force compared with other forging processes.

12 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Radial forging is used to produce components having a circular cross section.

13 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Rolling is described by the roll design and roll configuration.

14 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding The primary methods of extrusion are forward extrusion and backward extrusion.

15 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Fast ram speeds and short strokes are used in impact extrusion, and, because of the impulsive force applied, high production rates are possible.

16 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding The neutral axis is the boundary line between tensile and compressive stresses in bending.

17 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Bending methods include draw bending, compression bending, and press bending.

18 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Roll bending is used to curve plate, sheet, and bars into cylinders or cylindrical segments using machines with two or three rolls.

19 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Spinning is a process of forcing disks or tubing into cones, disk shapes, hollow cylinders, and other circular shapes by combined forces of rotation and pressure.

20 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Stretch forming is a process for forming sheet metal by applying tension to it and then wrapping it around a die of the desired shape.

21 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Superplastic forming enables sheet metal to be deformed into complex shapes under relatively low pressure.

22 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding In metal stamping operations, sheet metal is formed into the desired shape by the punch and the die.

23 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Cold heading is used to force metal to cold flow into enlarged sections by endwise squeezing.

24 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding In rotary swaging, tapered dies open and shut rapidly, as much as several thousand times a minute, as the workpiece is fed in.

25 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Sizing, coining, and hobbing are finishing operations that change metal thickness and configuration by squeezing and working the metal beyond its yield point.

26 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Thread rolling is the production of threads by rolling the workpiece between two grooved die plates and is most commonly used for making screw threads.

27 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Ironing is a process for smoothing and thinning the wall of a shell or cup.

28 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding The cutting tool is characterized by the rake angle and the relief angle.

29 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding A lathe is a basic feature of any machine shop and performs a variety of turning functions.

30 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Trepanning is a machining process for producing a circular hole or groove in solid stock, or a disk, cylinder, or tube from solid stock.

31 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Milling is the removal of material from a workpiece by a rotary tool with teeth that engage the workpiece as it moves past the tool.

32 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Broaching is cutting with a bar that has a series of teeth on one face that is pushed or pulled over the surface of the workpiece.

33 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Electrical discharge machining is the removal of metal by rapid spark discharge between different polarity electrodes.

34 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Electrochemical machining is the controlled removal of metal by anodic dissolution in an electrolytic cell in which the workpiece is the anode and the tool is the cathode.

35 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Chemical milling is the controlled dissolution of a workpiece surface by contact with chemical reagents varying in type and strength.

36 Chapter 26 Powder Metallurgy, Forming, Machining, and Grinding Grinding wheels are marked with symbols that designate their properties.


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