Admin مدير المنتدى
عدد المساهمات : 19004 التقييم : 35512 تاريخ التسجيل : 01/07/2009 الدولة : مصر العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
| موضوع: كتاب Casting and Moulding السبت 19 أكتوبر 2019, 6:20 am | |
|
أخوانى فى الله أحضرت لكم كتاب Casting and Moulding Foundry techniques for schools John Bolan Head of Craft, Design and Technology Faculty, Ashleigh School, Sheffield Heinemann Educational Books
و المحتوى كما يلي :
Glossary Backing sand Sand which is used to fill a moulding box after the facing sand has been applied. Bottom-part box Sometimes called the drag, it is often the first part of the mould to be rammed and usually contains the pattern. Casting A casting is produced when molten metal poured into a mould has cooled. It is also the term used for pouring the metal. Cope See top- part box. Core A core, usually made from sand, is used to form an internal shape in a casting. The core protrudes into the mould and molten metal flows around it. When the metal has solidified, the sand core can be removed leaving the required internal shape. Core box A box in which a core is made. Core print An extra piece of material added to a pattern that leaves a cavity in the sand into which a core can be located. Cover cores Sand cores made from core boxes to ease the moulding process. Dies Permanent or re-usable moulds, usually made from either plaster or metal, used for producing castings. Dowels Cylindrical pieces of timber which can be used to locate split patterns or core boxes accurately. Downgate A hole in the sand down which metal is poured when casting. Downgate peg Sometimes called a sprue peg it is used for producing a downgate. Draft See taper. Drag See bottom-part box. Facing sand To enable a smooth surface to be produced on a casting, it is advisable to cover the pattern with a layer of fine facing sand, before filling the moulding box with backing sand. Fillet Forms a radius on an internal corner to avoid the possibility of the casting being weakened when the metal cools. Finishing On castings, the finishing process can be divided into two sections: 1 Fettling, which means the removal of the downgate, risers, and runner bar. 2 The desired surface finish, which can be obtained by wire brush, files, or machines. G cramp Adjustable tool for holding parts of woodwork together during assembly. Greensand Moulding sand which uses water and clay for bonding purposes. 69Hand rammer A moulding tool which is used to pack sand into a moulding box. Hot wire cutter Equipment used for cutting polystyrene by means of a hot wire. Jointing down A moulding process used for irregular shaped castings. Lugs Parts of a moulding box which carry the locating attachments (usually holes and pins) . Match plate A device used to eliminate the jointing down process. Mould Molten metal is poured into a mould to produce a casting. Moulding box A box, sometimes called a flask, of either metal or wood, which is designed to hold the sand when making a mould. Mould cavity A cavity left in the mould after the removal of the pattern and into which the molten metal is poured. Moulding sand This sand is used for making moulds, and is bonded by water and clay, oil or resin. Moulding trowels There are several varieties of these trowels which are used for shaping sand when making a mould. Oddside A technique which eases the jointing down process when several moulds are to be produced. Parting powder A fine powder which is dusted onto rammed sand to prevent another layer sticking to it, between top and bottom-part boxes of a mould for example. Pattern A former, usually made from wood, metal, plastic, or polystyrene, which is used to produce a casting. It forms a cavity in sand into which metal is poured. Pattern plate A plate onto which patterns are fastened to ease the moulding process. Pins These are usually fastened to the lugs on a moulding box and are used to locate the two parts of the mould accurately. Plaster A liquid which sets into a solid that can be used for patterns or moulds. Polystyrene patterns A pattern made from polystyrene is not removed from the mould before casting. The pattern is burnt out by the molten metal during casting. Pyrometer An instrument which measures the temperature of molten metal. Rammer See hand rammer. Rapping Tapping the pattern gently to ease its withdrawal from the mould. Rapping and lifting plates Small plates, usually made from metal which are inserted into patterns to assist their withdrawal from moulds. Riser A hole in the mould which has the functions of allowing gases to escape and enables the person pouring the metal to gauge when the mould has been completely filled. It is also used to provide a pool of molten metal which will compensate for the normal loss in volume which occurs when a casting solidifies. Riser peg A peg used to form a riser cavity in the mould. 70Runner bar A channel along which molten metal flows from the downgate to the mould cavity. Safety jacket A wooden sleeve placed over a mould, to prevent accidents when pouring molten metal. Its most common application would be when casting projects not supported by moulding boxes (for example when stack moulding). Scratch vents Where the riser does not provide adequate ventilation because of the shape of the casting, a secondary form of venting will be necessary. A scratch vent is a shallow channel made in the sand. Snapflask A moulding box which is hinged at one corner and can be snapped away from the mould. Split pattern To simplify the moulding process, by eliminating the need to joint down, a pattern can sometimes be split, often along a centre line or at its widest point. Stack moulding A process used for making more than one casting. Moulds are stacked on top of each other and cast together. Strickle A straight bar which is used to remove excess sand when ramming is finished. Taper Sometimes called draft, it is used to allow the pattern to be withdrawn from a mould cleanly. Top-part box Sometimes called the cope, it is the uppermost box of a complete mould. Vents Ventilation holes or channels used to allow gases to escape from the mould. key 1 box sides 2 riser 3 vents 4 downgate 5 sand ledges 6 locating pins 7 joint line 10 vents 8 runner bar 9 mould cavity 11 riser base Fig. 1 Cross-section of a mould
كلمة سر فك الضغط : books-world.net The Unzip Password : books-world.net أتمنى أن تستفيدوا من محتوى الموضوع وأن ينال إعجابكم رابط من موقع عالم الكتب لتنزيل كتاب Casting and Moulding رابط مباشر لتنزيل كتاب Casting and Moulding
|
|