Proper Mold Design for Permanent Mold Production
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Troubleshooting Decorative Electroplating Installations, Part 5
Troubleshooting Decorative Electroplating Installations, Part 5: Plating Problems Caused Article By Heat & Bath Temperature Fluctuations by N.V. Mandich, CEF, AESF Fellow Technical Technical In previous parts of this series, emphasis was given The fast-machining steels must then be carburized to troubleshooting of the sequences for pre-plating or case-hardened to obtain a surface with the hardness and electroplating over metals, Parts 1 and 2;1 required to support the top chromium electroplate. the causes, symptoms and troubleshooting for Case hardening is the generic term covering several pores, pits, stains, blistering and “spotting-out” processes applicable to steel or ferrous alloys. It changes phenomena, Part 3;2 and troubleshooting plating on the surface composition of the top layer, or case, by plastic systems, Part 4.3 Here in Part 5, causes and adsorption of carbon, nitrogen or a mixture of the two. some typical examples of problems that occur in By diffusion, a concentration gradient is created. The electroplating as a result of a) thermal, mechanical heat-treatments and the composition of the steel are surface treatments, b) the metallurgy of the part to additional variables that should be addressed and taken be plated or c) effects of plating bath temperature into account in the electroplating procedure. on plating variables and quality of the deposits When discussing the effect of heat-treatment on are discussed. subsequent electroplating processes it is necessary to zero in on the type of heat-treatment involved. We Nearly every plater has at one time or another had the can defi ne the heat-treatment process as changing the experience of trying to plate parts that simply would characteristics of the parts by heating above a certain not plate. -
Permanent Mold
PERMANENT MOLD CASTING PROCESSES Many variations of the permanent mold process are well-suited for mass production of high-integrity light metal castings for automotive components. This article is based on “High Integrity Permanent Mold Casting Processes: Current and Future,” a presentation at the American Foundry Society’s 6th International Conference on Permanent Mold Casting of Aluminum and Magnesium. J. L. Jorstad* JLJ Technologies Inc. This Chrysler NS cross member was cast on a tilt permanent mold machine. Richmond, Virginia However, with the incorporation of ceramic-foam filters and their ability Permanent mold casting consists of several basic to smooth melt flow (Fig. 1), opportu- processes. In this article, key characteristics of nities become available to top-pour each will be considered in terms of their impact with significantly fewer entrapped ox- on high-integrity products. ides and other quality detractors. Turbulent flow Combining filters with down-sprue GRAVITY FILLING PROCESSES and runner designs proposed by Prof. Gravity pouring, whether manual, via auto- Campbell has made it possible to pour ladles, or robotic pouring, can be susceptible to reasonably high-integrity aluminum turbulence, which has a negative effect on high- castings, perhaps most suitable for a Pintegrity castings. It is nearly impossible to have variety of less-critical automotive molten aluminum free fall more than a few cen- applications. timeters without initially exceeding a safe flow Static top-pouring has another velocity of about 0.5 to 1 m/s. Note that a free fall downside too, an ever-diminishing of less than 0.1 m will accelerate to more than 1 effective metal head as fill progresses. -
Low-Pressure Casting of Aluminium Alsi7mg03 (A356) in Sand and Permanent Molds
MATEC Web of Conferences 326, 06001 (2020) https://doi.org/10.1051/matecconf/202032606001 ICAA17 Low-Pressure Casting of Aluminium AlSi7Mg03 (A356) in Sand and Permanent Molds Franco Chiesa1*, Bernard Duchesne2, and Gheorghe Marin1 1Centre de Métallurgie du Québec, 3095 Westinghouse, Trois-Rivières, Qc, Canada G9A 5E1 2Collège de Trois-Rivières, 3500 de Courval, Trois-Rivières, Qc, Canada, G9A 5E6 Abstract. Aluminium A356 (AlSi7Mg03) is the most common foundry alloy poured in sand and permanent molds or lost-wax shells. Because of its magnesium content, this alloy responds to a precipitation hardening treatment. The strength and ductility combination of the alloy can be varied at will by changing the temper treatment that follows the solutionizing and quenching of the part. By feeding the mold from the bottom, the low-pressure process provides a tranquil filling of the cavity. A perfect control of the liquid metal stream is provided by programming the pressure rise applied on the melt surface. It compares favorably to the more common gravity casting where a turbulent filling is governed by the geometry of the gating system. 1 The low-pressure permanent 2) The very efficient feeding achieved via the mold process bottom feeder tube by applying a pressure of up to one atmosphere to the melt; the resulting yield is very high, typically 80-90% versus 50-60% for The low-pressure permanent mold casting gravity casting. However, the low-pressure (LPPM) [1], schematized in Figure 1a and shown process cannot pour any casting geometries. in Figure 1b and 1c, is a common process Low-pressure sand casting (LPS) is much less producing high quality castings resulting from common than LPPM; the sand mold rests on top two main characteristics: of the pressurized enclosure as shown in Figure 1) The perfectly controlled quiescent filling 1d. -
OVERVIEW of FOUNDRY PROCESSES Contents 1
Cleaner Production Manual for the Queensland Foundry Industry November 1999 PART 5: OVERVIEW OF FOUNDRY PROCESSES Contents 1. Overview of Casting Processes...................................................................... 3 2. Casting Processes.......................................................................................... 6 2.1 Sand Casting ............................................................................................ 6 2.1.1 Pattern Making ................................................................................... 7 2.1.2 Mould Making ..................................................................................... 7 2.1.3 Melting and Pouring ........................................................................... 8 2.1.4 Cooling and Shakeout ........................................................................ 9 2.1.5 Sand Reclamation .............................................................................. 9 2.1.6 Fettling, Cleaning and Finishing....................................................... 10 2.1.7 Advantages of Sand Casting............................................................ 10 2.1.8 Limitations ........................................................................................ 10 2.1.9 By-products Generated .................................................................... 10 2.2 Shell Moulding ........................................................................................ 13 2.2.1 Advantages...................................................................................... -
Implementation of Metal Casting Best Practices
Implementation of Metal Casting Best Practices January 2007 Prepared for ITP Metal Casting Authors: Robert Eppich, Eppich Technologies Robert D. Naranjo, BCS, Incorporated Acknowledgement This project was a collaborative effort by Robert Eppich (Eppich Technologies) and Robert Naranjo (BCS, Incorporated). Mr. Eppich coordinated this project and was the technical lead for this effort. He guided the data collection and analysis. Mr. Naranjo assisted in the data collection and analysis of the results and led the development of the final report. The final report was prepared by Robert Naranjo, Lee Schultz, Rajita Majumdar, Bill Choate, Ellen Glover, and Krista Jones of BCS, Incorporated. The cover was designed by Borys Mararytsya of BCS, Incorporated. We also gratefully acknowledge the support of the U.S. Department of Energy, the Advanced Technology Institute, and the Cast Metals Coalition in conducting this project. Disclaimer This report was prepared as an account of work sponsored by an Agency of the United States Government. Neither the United States Government nor any Agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any Agency thereof. The views and opinions expressed by the authors herein do not necessarily state or reflect those of the United States Government or any Agency thereof. -
Electroforming of Copper Canisters
Mineralogical Magazine, November 2015, Vol. 79(6), pp. 1521–1528 OPEN ACCESS Manufacturing technology for implementing geological disposal: electroforming of copper canisters 1,2,3,* 1,3 1,4 2 2 T. H ERNANDEZ-SELVA ,D.L.ENGELBERG ,F.SCENINI ,D.FOX AND A. MCCLUSKY 1 Materials Performance Centre, School of Materials, The University of Manchester, Manchester M13 9PL, UK 2 BEP Surface Technologies Ltd, Eton Hill Road, Radcliffe, Manchester M26 2XT, UK 3 Research Centre for Radwaste and Decommissioning, The University of Manchester, Manchester M13 9PL, UK 4 Nuclear Advanced Manufacturing Centre, The University of Manchester, Manchester M13 9PL, UK ABSTRACT The existing capability and current development needs for implementing electroforming as a viable manufacturing process to produce copper cylinders with dimensions comparable to the Swedish KBS-3 design are discussed. Large freestanding copper cylinders can be produced readily, but there is a need to address challenges associated with controlling the electro-deposition process to conform to compositional and mechanical requirements of the copper layers produced. The methodology to optimize the manufacturing process, based on a study of key parameters, such as the effects of electrolyte additives on grain size and the chemical composition of electroformed layers, is described here. Possible ways to introduce a robust manufacturing route are also presented. K EYWORDS: nuclear wastes, deep geological repository, KBS-3 copper canister, electroforming, electroplating. Introduction Institute, 2006; ARAO, 2009), whereas the Nuclear Waste Management Organization (NWMO) of THE concept for the UK’s inventory of high-level Canada is focusing its research on thick-walled radioactive waste (HLW) is to implement deep steel containers coated with 3 mm of electroplated geological disposal (Department of Energy & copper (Keech et al., 2014). -
Enhanced Fracture Strength in the Working Layer of Rolls Manufactured in Ni-Hard Cast Iron Alloyed with Mo, Nb and Mg
metals Article Enhanced Fracture Strength in the Working Layer of Rolls Manufactured in Ni-Hard Cast Iron Alloyed with Mo, Nb and Mg Alberto Cofiño-Villar 1, Jose Florentino Alvarez-Antolin 1,* and Juan Asensio-Lozano 2 1 Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, Edificio departamental Este, Universidad de Oviedo C/ Wifredo Ricart s/n-, 33204 Gijón (Asturias), Spain; [email protected] 2 Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, Escuela de Ingeniería de Minas, Energía y Materiales, Universidad de Oviedo, C/ Independencia 13, 33004 Oviedo (Asturias), Spain; [email protected] * Correspondence: alvarezfl[email protected]; Tel.: +34-985-181-949 Received: 28 August 2018; Accepted: 13 September 2018; Published: 15 September 2018 Abstract: One of the main in-service failure mechanisms of the work-rolls used in hot strip mill finishing stands is surface spalling. The indefinite chill double-poured rolls usually comprise of a peripheral working layer made of crushed Ni-hard cast iron and a grey cast iron core, mostly pearlitic matrix with spheroidal graphite. To enhance its wear resistance, the working layer can be alloyed with Mo and Nb. The possible cracking and spalling of the surfaces of these work-rolls is strongly influenced by the presence of carbides and the continuity of their network. The flexural and impact toughness tests are reliable testing methods to assess these properties. The aim of this paper is to identify those manufacturing factors that have a significant effect on the flexural strength and toughness of this material, correlating the results with the volume fraction of precipitated carbides. -
Metals in the Bible: Silver (Part 1)
The Testimony, August 2004 329 times of restitution of all things” (Acts 3:21, AV). the last verse of his song does look forward to In contrast, the song of Moses in chapter 32 pre- the time of blessing when the Gentiles will re- dicts future rebellion and consequent punish- joice with God’s people and atonement will have ment that would occur before the final glory been provided for both land and people (v. 43). would be attained by the nation. Nevertheless, (To be continued) New feature Metals in the Bible 3. Silver (Part 1) Peter Hemingray In 1996 and 1997 The Testimony published two two-part articles under the title, “Metals in the Bible”, in which we looked at iron and copper.1 We considered the ancient technology of iron, and how this knowledge helps illuminate the Biblical references to it. In particular, we saw how the introduction of iron during the period of the conquest affected the Israelites, who had to overcome superior technology through the power of God. For copper (or brass, as the AV terms it) the ancient metalworking methods were illuminated with illustrations from Timnah in Palestine, and we argued for the symbology of copper in the Bible being primarily that of strength, and only rarely that of the strength of sin. The intention was to complete these studies on metals of the Bible by considering silver, then gold. This we have now done in two further two-part articles to be published in this and the coming months, God willing. E WILL CONTINUE the theme of il- • examine the references to refining and cruci- lustrating the Biblical passages about bles in the light of our knowledge of ancient Wmetals with descriptions of the ancient metalworking practices metalworking techniques, as we consider silver, • look at the few references to lead in the Bible, the next metal up in Nebuchadnezzar’s image often associated with silver for reasons we after the iron and brass already considered. -
ZEP LUBEZE DRILL CHILL™ Cutting Oil
PROD. #1378 205 PRODUCT SPECIFICATION REPORT ZEP LUBEZE DRILL CHILL™ Cutting Oil DESCRIPTION A fatty, mineral oil based, ready to use metalworking fluid, fortified with extremely pressure additives. FEATURES BENEFITS • Versatile • Can be used on carbon, allot, and stainless steel as well as softer metals such as aluminum. • Anti weld • Helps prevent chips from welding to tool surface • Prolongs tool life • Reduces friction, increases cutting speeds • Inhibits rust • Leaves behind a light oil film which provides temporary protection to the work piece and tool surface • Conserves energy • Lowers resistance to cutting resulting in lower torque and power requirements APPLICATIONS An excellent lubricating fluid for metalworking applications, particularly in extreme pressure situations such as drilling and threading. Used in any metalworking and fabricating facility. COMPANION PRODUCTS Zep Gator Tails, Zep degreasers, Zep Cold Galvanized, Zep Super Penetrant, Zep Ironclad, Zep PLS, Zep Viton Gloves SPECIFICATIONS Physical form . .Thin, amber oil Boiling point . .545 - 884°F Flash point (TCC) . .300°F Shelf life . .1 year minimum Odor . .solvent odor DOT Shipping label . .LUBRICANTS, METAL CUTTING, pH . .N/A . .LIQUID, NOI Specific gravity . .0.88 PACKAGING 5 gallon pail 55 gallon drum ZEP MANUFACTURING COMPANY 1-877-I BUY ZEP Your One Source for Cleaning and Maintenance Products (1-877-428-9937) PROD. #1378 205 PRODUCT LABEL ZEP LUBEZE DRILL CHILL™ Cutting Oil ™ PROD.# 1378 LUBEZE DRILL CHILL 501B CUTTING OIL •Drilling •Cutting •Boring •Thread Cutting and Machining Operations A premium cutting oil fortified with sulfur and chlorine compounds for FIRST AID: effectiveness in extreme pressure applications. Provides excellent lubricity. EYES: Immediately flush eyes with plenty of water for at least 15 minutes, occasionally Reduces energy requirements by lowering resistance to cutting tool. -
DROSS in DUCTILE IRON by Hans Roedter, Sorelmetal Technical Services
98 DROSS IN DUCTILE IRON by Hans Roedter, Sorelmetal Technical Services WHAT IS “DROSS ”? magnesium with other elements. Dross also Dross is a reaction product which is formed from occurs in the form of long stringers instead of Mg treatment and during subsequent reoxidation concentrated “slag like” areas. When it occurs in of Mg rejected from the molten metal before it this string like form it acts like cracks or flake solidifies. It is therefore just another word for a graphite in the structure and so fatigue strength specific type of slag (reaction product). and impact strength of the material are lowered considerably. The reaction binds magnesium with sulphur, oxygen and silicon and forms continuously. This “dross” is light weight and so it will generally be found in the upper surfaces and under cores, but it can be entrained throughout the metal as well, especially with colder pouring tempera - tures. It is very difficult to completely avoid the reaction of magnesium with these other elements, since we need magnesium to form nodules. We are always confronted with the problem of dross in the production of Ductile Iron. WHAT IS PROMOTING “DROSS ” AND WHAT CAN BE DONE TO KEEP THE “DROSS ” OUT OF THE CASTING ? Since “dross” is always connected with magnesium, it is necessary to keep the magnesium level as low as possible. Good inoculation practice with some late inoculation in conjunction with sufficient magnesium will When looking at “dross” in the microscope you produce nice round small nodules. See will almost always find flake graphite in Suggestion Sheet 76. -
Extrusion Blow Molding ___Fiberg
Woman Owned Small Busines • ITAR Certified 710 South Patrick Drive • Satellite Beach, Florida 32937 321.536.2611 • [email protected] • www.rapidps.com ABS • POLYCARBONATE • POLYPHENYLSULFONE • ULTEM ADVANCED APPLICATIONS _____________________________ RTV MOLDS __________________________ Parts produced can be used in lots of different manufacturing applications. Parts built using RPS provide the fast, accurate and af- Parts can be painted, electroplated and drilled. They can also be used in ad- fordable patterns that drive RTV molding. By replacing vanced applications such as investment castings, RTV molding and sand cast- machined patterns, the entire process can be com- ing. Each application includes the benefits to using an RPS part with detailed pleted in 2-3 days. And unlike machining, complex instructions. and intricate shapes have no effect on the time or cost for the RPS pattern. ELECTROPLATING ____________________ Electroplating deposits a thin layer of metal on the RTV MOLDING SOLUBLE CORE _________ surface of a part built. This improves the part’s me- Complex geometries normally requiring core removal chanical properties and gives the appearance of pro- such as curved hoses, water tanks, bottles, and arterial duction metal or plated parts and provides a hard, structures are good examples where it may be helpful wear-resistant surface with reflective properties. to use this alternative method. Instead of building the core in thermoplastic material (traditional RPS build EXTRUSION BLOW MOLDING __________ process) the mold is built in the Water Soluble sup- Polycarbonate RPS molds are used in the blow port material making it easy to dissolve away the mate- molding process, reducing lead time and expense. -
Lecture 8: Casting Technology
Lecture 8: Casting Technology MT321: Principles of Materials Processing Lecture 8:Casting Technology 1 Design of Gating Systems Functions of a gating system: To deliver liquid metal to mould cavity within a short time. To minimise turbulent flow. To keep dross and/or inclusion particles from entering mould cavity. MT321: Principles of Materials Processing Lecture 8:Casting Technology 2 MT321: Principles of Materials Processing Lecture 8:Casting Technology 3 How to deliver liquid metal fast? By using a sufficient large cross sectional area; By using multiple runners. How to minimise turbulent flow? By using tapered sprue and runners. By bottom filling of the liquid into the mould cavity. By regulating the change of cross sectional area of the channels according to fluid dynamics principles. MT321: Principles of Materials Processing Lecture 8:Casting Technology 4 How to keep dross and inclusion particles from entering mould cavity? By using dross traps. By using filters. MT321: Principles of Materials Processing Lecture 8:Casting Technology 5 Various types of ceramic filters that may be inserted into the gating systems of metal castings MT321: Principles of Materials Processing Lecture 8:Casting Technology 6 MT321: Principles of Materials Processing Lecture 8:Casting Technology 7 Solidification Shrinkage The liquid of most metals and alloys shrinks during solidification. Solidification shrinkage (percent) of some common engineering metals and alloys MT321: Principles of Materials Processing Lecture 8:Casting Technology 8 Two considerations must be made in designing a casting mould, due to the solidification shrinkage: A riser, which is a reservoir of liquid, is needed to compensate for the shrinkage of the whole casting.