Manufacturing Processes

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1 Manufacturing Processes Product example Manufacturing process definition Deformation processes Casting processes Sheet metalworking Hammer Forging Video Polymer processing

2 How would we manufacture a mountain bike? Rear Brake Seat Post Saddle Down Tube Top Tube Handle Bar Fork Front Brake Rear Derailleur Pedal (Courtesy of Trek Bicycle, 2002)

3 Manufacturing process decisions Specific manufacturing processes? How do the selected materials influence the choice of manufacturing processes? Does product function or performance issues influence our choice of mfg. processes? What criteria should we use to select processes? Which criteria are more important? Who will make the final decisions?

4 Parts undergo sequence of processes Primary - alter the ( raw ) material s basic shape or form. Sand casting Rolling Forging Sheet metalworking Secondary - add or remove geometric features from the basic forms Machining of a brake drum casting (flat surfaces) Drilling/punching of refrigerator housings (sheet metal) Trimming of injection molded part flash Tertiary - surface treatments Polishing Painting Heat-treating Joining Changes?

5 Types of manufacturing processes Manufacturing Processes How is the input material changed? Deformation Casting Sheet Metal Polymer Processes Machining Finishing Assembly Extrusion Forging Rolling Bar drawing Wire drawing Centrifugal Die casting Investment Permanent mold Sand casting Bending Blanking Drawing Punching Shearing Spinning Blow molding Casting Compression molding Extrusion Injection Molding Thermoforming Transfer molding Boring Drilling Facing Grinding Milling Planing Turning Sawing ECM, EDM Anodizing Honing Painting Plating Polishing Automated Bonding Brazing Manual Riveting Soldering Welding

6 Deformation processes Rolling Extrusion Drawing Forging

7 Rolling (of ductile materials) thick slab Rollers in compression Plastic deformation thin sheet

8 Rolling bloom structural ingot slab sheet coil billet bar rod

9 Extrusion Extrusion die Ram Cross sections Billet

10 Drawing Drawing die Cross sections Billet Pulling force

11 Forging (closed-die) Ram pressure Blocked preform Flash Gutter

12 Casting Processes Sand casting Die casting Investment casting

13 Sand casting (closed-mold) Cope Flask Core Riser Sprue Parting line Drag Gate Runner

14 Die casting Stationary die Moving die Molten metal Plunger Ejector pins Sprue Parting line

15 Investment casting 4-part pattern tree Ceramic mold (hardened slurry) Wax pattern is cast Wax removed by melting Molten metal solidifies in cast Ceramic mold is removed

16 Sheet Metalworking Bending Blanking Drawing Punching Shearing Spinning

17 Sheet metal drawing Punch ram Punch Blank holder Die Clamp force Blank Drawn part

18 Polymer Processes Compression molding Transfer Molding Blow molding Injection molding

19 Compression molding Heated mold Ram Pressure Charge Part

20 Transfer molding Ram pressure Ram Heated mold Charge Sprue Part

21 Blow molding Molten parison is extruded Mold halves close Air blown into parison Part is removed Extruder air injector parison

22 Injection molding Cavity half of mold Core half of mold Pellets Feed hopper Barrel Ejector pins Shear-heating Sprue Parting plane/surface Fixed Moving Mold closure direction

23 Example of a box with no undercuts ejector pins parting line core mold closure direction cavity plastic injection

24 Internal undercuts ejector pins parting line core closure direction cavity plastic injection

25 External undercuts ejector pins parting line core cavity plastic injection

26 Solidification processes summary molten material freezing Casting Processes Sand Casting Die Casting Investment Casting Centrifugal solid Part Polymer Processes Injection Molding Blow Molding ThermoForming Compression Molding Add to your notes Flow (voids, flash) Cooling time (cycle time) Temperature Mold complexity Warpage Post processing Costs (materials, tooling, processing)

27 Manufacturing Processes - Part B Machining Finishing Assembly Some other processes

28 Machining processes Manufacturing Processes (subtractive, removal) Deformation Casting Sheet Metal Polymer Processes Machining Finishing Assembly Extrusion Forging Rolling Bar drawing Wire drawing Centrifugal Die casting Investment Permanent mold Sand casting Bending Blanking Drawing Punching Shearing Spinning Blow molding Casting Compression molding Extrusion Injection Molding Thermoforming Transfer molding Boring Drilling Facing Grinding Milling Planing Turning Sawing ECM, EDM Anodizing Honing Painting Plating Polishing Automated Bonding Brazing Manual Riveting Soldering Welding

29 Machining removal of material Sawing using a toothed blade. Milling from a flat surface by a rotating cutter tool. Planing using a translating cutter as workpiece feeds. Shaping - from a translating workpiece using a stationary cutter. Boring - increasing diameter of existing hole by rotating the workpiece. Drilling- using a rotating bit forming a cylindrical hole. Reaming to refine the diameter of an existing hole. Turning - from a rotating workpiece. Facing - from turning workpiece using a radially fed tool. Grinding - from a surface using an abrasive spinning wheel. Electric discharge machining - by means of a spark.

30 Machining process considerations solid material machining material removed sawing, turning, boring, milling, drilling, grinding, ECM Add to your notes hardness, strength of material shear forces = strong jigs & fixtures tool/bit wear, replacement size of workpiece, fit machine? volume removed rate of removal, hp needed tolerances operator skill, CNC costs (materials, tooling, processing)

31 Finishing processes Manufacturing Processes protection? Deformation Casting Sheet Metal Polymer Processes Machining Finishing Assembly Extrusion Forging Rolling Bar drawing Wire drawing Centrifugal Die casting Investment Permanent mold Sand casting Bending Blanking Drawing Punching Shearing Spinning Blow molding Casting Compression molding Extrusion Injection Molding Thermoforming Transfer molding Boring Drilling Facing Grinding Milling Planing Turning Sawing ECM, EDM Anodizing Honing Painting Plating Polishing Automated Bonding Brazing Manual Riveting Soldering Welding

32 Assembly processes fastening / joining of 2 or more components Manufacturing Processes Deformation Casting Sheet Metal Polymer Processes Machining Finishing Assembly Extrusion Forging Rolling Bar drawing Wire drawing Centrifugal Die casting Investment Permanent mold Sand casting Bending Blanking Drawing Punching Shearing Spinning Blow molding Casting Compression molding Extrusion Injection Molding Thermoforming Transfer molding Boring Drilling Facing Grinding Milling Planing Turning Sawing ECM, EDM Anodizing Honing Painting Plating Polishing Automated Bonding Brazing Manual Riveting Soldering Welding permanent?

33 Rotomolding-rotational molding Steps in Rotational Molding Process: 1.A pre-measured amount of plastic resin is placed into a mold. 2.The mold is then moved into an oven where it is rotated on both axis. As the resin melts, it coats the inside surface of the mold cavity, allowing for excellent uniform wall thickness. 3.Once the resin is completely fused, the mold is removed from the oven and cooled by air or water. 4.Then the part is removed from the mold gas tank

34 Manufacturing Processes Part C Material compatibilities Process (shape) capabilities Manufacturing costs

35 Product Function is Interdependent Material Properties Product Function Manufacturing Processes Product Geometry

36 Process / Material Screening Process-First Approach Material First Approach Part Information Application Information 1. Production Volume 1. Applied Loads 2. Part Size (overall) magnitude 3. Shape Capability (features) cyclic nature (fatigue) boss/depression 1D rate (slow, impact) boss/depression >1D duration (creep) holes 2. Ambient Conditions undercuts (int./ext.) temperature uniform walls moisture cross sections (uniform /regular) rotational symmetry captured cavities sunlight (ultra-violet) chemical liquids/vapors 3. Safety/Legal (FDA, UL) 4. Cost

37 Are materials compatible with mfg. process? Material Properties Manufacturing Processes compatible materials & processes

38 Cast Iron Carbon Steel Alloy Steel Stainless Steel Aluminum & alloys Copper & alloys Zinc & alloys Magnesiu m & alloys Titanium and alloys Nickel & alloys Refractor y metals Thermopl astics Thermose ts Materials Processes Material- Process Compatibility Solidification Sand casting Investment casting Die casting Injection molding Structural foam Blow molding - extr Blow molding - inj Rotational molding Bulk Impact extrusion Deformation Cold heading Closed die forging Powder metal Hot extrusion Rotary swaging Metal Removal Profiling Sheet Forming Machined from stock ECM EDM Wire EDM Sheet stamp/bend Thermoforming Metal spinning Normal practice Less common Not applicable

39 Is process capable of producing part geometry? capable geometry & processes Manufacturing Processes Product Geometry

40 Process-first selection approach Part Information 1. Production Volume (run qty) 2. Part Size (overall) 3. Shape Capability (features) boss/depression 1D boss/depression >1D holes undercuts (int./ext.) uniform walls uniform cross sections regular cross sections rotational symmetry captured cavities

41 Uniform wall (thickness) but Varying cross section Constant cross section

42 Uniform cross section (constant cross section) Non-uniform wall thicknesses

43 Axis of rotation (symmetry)

44 Regular cross section (regular pattern) Regular (i.e.pattern) Regular (i.e.pattern) not-regular

45 Captured cavities

46 Enclosed (hollow) And, rotationally molded parts

47 Draft free surfaces No draft extruded With draft Cope Flask Core Riser Sprue Parting line Drag Gate Runner

48 Manufacturing costs of a part Total Manufacturing Cost = Material + Tooling + Processing raw mat ls molds labor fixtures electricity jigs supplies tool bits O/H (deprec.) TMC = M + T + P (6.1)

49 Material costs per part Let M = total materials costs (raw, bulk) q = production quantity Then material costs per part, c M is c M = M/q = (cost/weight x weight) / number of parts Let s reorganize the variables in the equation above c M = [cost/weight] [weight/number of parts] = (cost/weight) (weight/part), and therefore c M = cost/part

50 Material cost per part (continued) Let c w = material cost per unit weight, and w p = weight of finished part w w = weight of wasted material, scrap = ratio of wasted material weight / finished weight = w w / w p Then the material cost per part, c M is c M = c w (w p + w w ) = c w (w p + w p ) (6.2) c M = c w w p (1+ ) (6.3) e.g. sand casting c M = ($1/lb)(1lb/part)(1+.05) = $1.05/part

51 Tooling cost per part Let T= total cost of molds, fixtures per production run q = number of parts per run Then c T = T/q (6.4) e.g. sand casting c T = ($10,000/run) / (5000 parts/run) = $2.00/part

52 Processing cost per part Let c t = cost per hour, (machine rate + labor) t = cycle time (hours per part) then c P = c t t (6.5) e.g. sand casting c P = ($30/hr) (0.3 hrs/part) = $9/part

53 Total cost per part Cost per part, c = c M + c T + c P c = c w w p (1+ ) + T/q + c t t (6.6) e.g. sand casting c = $ $ $9.00 c = $12.05 / part

54 Example costs for 5000 part run Alternative A B C Mfg. Process Sand casting Injection molding Machining Material Aluminum alloy ABS Bronze alloy Part weight (lb) alpha Material cost ($/lb), c w Tooling cost ($), T Production quantity, q Cycle time (hrs/part), t Machine rate ($/hr) Part cost ($/part)

55 Cost ($/part) Run quantity is important! 1000 Manufacturing Cost per Part Production quantity A B C A-Sand casting B-Inj.Molding C-Machining

56 How can we lower the cost of parts? c = c w w p (1+ ) + T/q + c t t (6.6) 1) purchase less expensive materials, 2) keep our finished part weight low 3) produce little manufactured waste 4) design simple parts that result in less expensive tooling 5) make many parts production run (i.e. batch) 6) choose a manufacturing process that has a low cycle time & cost per hour Goal: minimize the sum of the terms! (not any one term in particular)

57 Summary Parts are made w/ primary, secondary, and tertiary manufacturing processes. Fundamental processes include: bulk deformation, casting, sheet metal working, polymer processes, machining, finishing, and assembly. Manufacturing costs include material, tooling, and processing costs. Some processes are more compatible with certain materials. Some processes are more capable at generating certain geometric features. Process selection considerations include: part size, geometric complexity, and production quantities.

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