Powder Metals

							Powder Metals
 Chapters 3.12
http://www.alliedsinterings.com/
 Oil Impregnated sintered
 bronze bearings

Sintered bronze begins as powdered metal which is packed into a die and
pressed under heavy tonnage to finished blank - near net - sizes.

This material, now in a "green state”,is then sintered in a furnace to fuse the
powdered particles into a solid form. This form remains approximately 20%
porous.

Lubricant is absorbed and stored in countless thousands of tiny interconnected
pores - between sintered groups of powder - by vacuum impregnation or hours
long immersion in hot oil.

Capillary action holds the oil in the bearing and prevents it from dripping out.

http://www.lm-tarbell.com/machining_sintered_bronze.htm
                      Make Powder




http://asmcommunity.asminternational.org/static/Static%20Files/IP/Magazine/AMP/V163/I
03/amp16303p036.pdf?authtoken=6822a0527194782b33d96e9d5b876b165673a344
                            Press and Sinter




http://www.marquette.edu/engineering/pages/AllYo
uNeed/Mechanical/Labs/cjmaprojects.html
                                                   http://asmcommunity.asminternational.org/static/Static%
                                                   20Files/IP/Magazine/AMP/V166/I08/amp16608p054.pdf?
                                                   authtoken=a394a51d5b522109a2ba7208a9e20cf210e67
                                                   530
                        Weight: PM slide 245 g, PM rotor 178 g,
Case Study 10                      PM lid 545 g, PM body 495 g
                        Alloy: Slide—FC-0205, other parts—FC-0208
                        Tensile Strength: 50/60 ksi
Component: Automatic-   Elongation: Less than 1%
Tramsmission Oil Pump   Apprent Hardness: Steam-Treated Surface—
                             HRB 85, Rotor Spline—HRA 70
Process: PM Assembly    Secondary Operations: Double-Disc Grinding
                        Alternative Process: Cast and Machine
                        Annual Production: 1,000,000
                        Description:
                        This oil pump is supplied to General Motors as a complete stand-
                        alone component, ready to install in their 4T40 front-wheel-drive
                        automatic transmission. It is the world's first non-select-fit, high-
                        volume transmission oil pump. Previous automatic pump designs
                        employ cast-iron or aluminum housings and lids. The housing pump
                        pocket would be machined to a typical tolerance of .050mm,
                        necessitating the use of select-fit pump components to maintain the
                        clearance required for good pump performance.
                        The net-form capability of powder metallurgy, combined with grinding
                        the length and parallelism of each component to tolerances of less
                        than .010mm, provides a low-cost, efficient, and reliable oil pump
                        that eliminates the requirement to select-fit during assembly.
                        Eliminating the select-fit operation improves the overall efficiency of
                        the pump, reduces the amount of inventory in the system, and
                        reduces the cost of the assembly operation.
                        Transmission pumps also typically require two powder metal
                        pumping components. This design employs a total of 4 PM parts:
                        rotor, slide, body, and lid. All parts are steam treated for improved
                        wear resistance, and the rotor spline is induction hardened.
                       Component
                       Name:         Automatic Tramsmission Oil Pump
                       Weight:
                                     •
                                     4 P/M parts: slide 245 g
                                               rotor 178 g
                                                  lid 545 g
                                               body 495 g
                       Alloy:        FC0205 - slide; FC 0208 rest
                       Tensile       50/60 ksi
                       Strength:
                       Elongation:   Less than 1%
                       Apparent      Steam treated surface HRb (85)
                       Hardness:     Rotor spline HRA 70
                       Secondary     Double disc grind
                       Operations:
http://www.mpif.org/
                       Alternate     Cast and machine
                       Process:
                       Annual        One Million
                       Production:
http://www.mpif.org/
Kalpakjian
 What is the advantage of making
 gears using powder metals?                        For the “crankshaft/counterweight,
                                                   what is the purpose of the small
                                                   “flat” at the edge of the part?




What draft angle is needed on this
connecting rod wall to facilitate
removal from the die?

                    Powder Metal Air Compressor Parts


http://www.iti-abrasives.com/img%5Csolutions%5C2527_Air_Pump_Powder_Metallurgy_Parts.jpg