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AMTS07 Mold Construction 7-307.30 Do not use standard core pins for core pull, use DME Thru-Hard ejector pins. 7.31 Normally double rod end cylinders are permissible for mounting limit switch components. 7.32 Stand-off posts are required to protect cylinders. 7.33 All horn pins actuated slides will be spring-loaded so that they hold the slide in position or mechanically latched, or both, to accept the pin and not slide out of position if mounted vertically in the mold. 7.34 All welding must be approved by Argo Mold, before being attempted. 7.35 The ejector plate will be fitted with positive stop buttons. The A & B plates will have pry slots to ease separation during maintenance. If the mold has slides that will be damaged by the premature action of the ejector plate. They will be fitted with a plaque on the side of the ejector plate stating “Damage will occur if ejectors are moved forward before mold is fully open." 7.36 All areas prone to wear are to have easily replaceable wear plates made of Graphite impregnated bronze and hardened sides. 7.37 Ejection will be designed and built to the following design guide lines: 7.37.1 Ejection must be added to design at same time as waterlines. Sometimes ejector pins might be relocated in favor of waterlines. 7.37.2 Do not use small diameter ejector pins unless necessary. 7.37.3 Do not use blade ejectors unless instructed to do so by Argo Mold. 7.37.4 Location of ejector pins is important to ensure part is pushed off ejector steel-not pulled. 7.37.5 Is there need for automatic accelerated ejection? 7.37.6 Do not locate ejector pins too close to deep vertical walls or ribs where part could hang up on pins when ejected, and/or steel might crack. 7.37.7 Sleeve ejectors should be used on deep bosses. Make sure proper bearing length is maintained inside sleeves. Use sleeve extensions if required. 7.37.8 If ejector pins are located under slide(s), what safety provision is designed to prevent the slide(s) from hitting the pins? 7.37.9 Lock all ejector pins on contoured or angle surfaces. Grind flat on head of pin and fit to machined pocket in ejector retainer plate. 7.37.10 Ejector pins on angle surfaces greater than 15 degrees, should have series of grooves to prevent pin skidding on part. 7.37.11 All ejector pins must be numbered and recorded on a chart showing pin diameter, X & Y dimensions, and clearance drill depth. This chart should appear on ejector plan view. 7.37.12 An ejection stroke must be dimensioned on section. 7.37.13 Where shut height is not a problem, front ejector plate stops must be shown on design. These stops are attached to back of an ejector block with S.H.C.S. These stops are located on or near K.O. centers or close to cylinders for hydraulic ejection (Normally four to eight stops). 7.37.14 Rest buttons or back stops are press fit or screwed to ejector clamp plate and must be located behind return pins, and ejector pins and close to cylinders for hydraulic ejection. 7.37.15 Length of top will vary if waterline fittings and pipes come out back of ejector blocks. 7.37.16 Ejector retainer plate is normally 3"-4" thick on large molds. 7.37.17 Ejector bushings must be graphite impregnated bronze. Length of bushings should allow as much bearing surface as possible. 7.37.18 Are die springs required? 7.37.19 Unless specified otherwise by Argo Mold, if hydraulic cylinders are required for ejection use side-mount lugs with a key retainer plated and bolt to an ejector block. A cylinder mounting plate might be required. Parallels are normally used for hydraulic manifold. Large molds require two cylinders on each end and flow dividers. 7.37.20 Use “T” connector in ejector plate to connect to cylinder rods. 7.37.21 Limit switches are required with hydraulic ejection. 7.37.22 Ejector plates more than fifty pounds require handling holes. Two per side on four sides. 7.37.23 After ejection and support pillars are approved designer must provide “letter” or “legal” size drawing that can be FAXed to Argo Mold. This drawing does not require title block, but must have the following: 7.37.23.1 Dimensions of plates 7.37.23.2 Locations of support pillars and diameters. 7.37.23.3 Thickness of plates. 7.37.23.4 Material of plates. 7.37.23.5 Date 7.38 Core pins will be designed and built to the following design guide lines: 7.38.1 All core pins must be shown in plan views and sections of mold assembly. 7.38.2 Mold design must include core pin detail drawing showing a picture of part with all cored holes identified with core pin number. All cores must be detailed. 7.38.3 The designer must confirm with Argo Mold if cored holes will be dimensioned to data or part drawing. Normally cores are dimensioned to high side tolerance on part drawing. If part drawing is not available at time of detailing leave dimensions blank. 7.38.4 Use DME “C” type core pins unless specified otherwise by Argo Mold. Do not use ejector pins unless length required exceeds standard core pin lengths. 7.38.5 Core pins are normally held with two set screws and should have access holes to allow replacing core pins without disassembly of mold. 7.38.6 For locking single core pins, EDM “D” shape inside the tap drill diameter of set-screw and grind flat on head. If core pins are too close to use set screws, use retainer plate in back of block. Where possible, extend core pins through ejector plates and retain pins in clamp plate for easy access. 7.38.7 Do not use front load press fit or screw in type core pins unless authorized by Argo Mold. 7.38.8 Ampco 940 core pins should be used to core holes in deep or heavy bosses. 7.38.9 Core pin detail drawings must be changed if necessary to agree with any changes during the build. Information sent to Argo Mold must be correct for making replacement cores. 7.38.9.1 A cap plate will retain all core pins inside sleeve ejectors held in position by a minimum of two screws. 7.38.9.2 All core pins that shut off against steel or are piloted into a hole are to be made from CX Hardened pins, unless otherwise noted. 7.39 All stripper plates, rings, and blades must be hardened or nitrided. |
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