moldWord文件下载.docx

1、Pos. No.DenominationStandardDINISO1Plate, plain16760-16753-22Plat, drilledV 16760-2/3Support pillarDIN ISO 10073100734Centring sleeve1675994495Locating guide pillar1676180176Locating guide busch1671680187Ejector pin, cylindrical head1530-A67518Shouldered ejector pin, cylindrical head1530-C86949Eject

2、or pin, conical head1530-D10Flat ejector pin1530-F869311Ejector sleeve16756840512Sprue puller insert1675713Sprue bushing16752-11007214Angle pin840415Locating unit, round and falt840616Locating ring1676310907-110907-217Thermal insulating sheet167131560018Cooling connectors16766B Mold Construction The

3、 construction of the mold for injection molding begins with the working drawing. From it the tequirements for the mold can be specified. These would include the material from which the mold should be made, the availability of equipment for machining the mold, and the mold capacity of the die set on

4、the machine. Cold rolled steel is an ideal material for laboratory molds, since it machines well, is fairly inexpensive, and holds up well for nozzle pressure and wear. Its major disadvantage is that it will rust quickly unless protected by mold telease or wax during storage. Complicated mold caviti

5、es need specialized machining and polishing, therefore, circular cavities which can be turned and polished on the lathe require less equipment and machining skill. Similar molds may also be machined from aluminum, and they have the advantage of not rusting. Excessive wear develops on the sprue due t

6、o the high nozzle pressure on the soft aluminum, but this can be overcome by the use of a steel cover plate on the top of the mold. Another method of mold construction is by the casting process using an aluminum filled epoxy resin. This type of mold is particularly suited to products of intricate de

7、sign and products that are difficult to machine. The cast epoxy is strong and gives good surface detail, however, it is brittle and should have a steel top plate attached to absorb the wear of the nozzle. A pattern of the product must be secured or made and placed on a mold plate. The drag of a smal

8、l steel flask is placed around the pattern and the epoxy resin is poured to fill the mold half. When this half of the mold has been cured, the cope is placed over it and the remainder of the mold poured. Upon curing, the flask is removed, all surfaces machined smooth, dowel pinholes drilled, and dowels inserted. A steel cap plate should be bolted to the top halves and the sprue, runners, and gates machined. Instructions for mixing, pouring, and curing the aluminum fille