模具制造技术英文文献和中文翻译(5)
2.7.2 negative compactions casting
The negative compaction casting calls V law modelling. This technology is the use all does but does not have the cementing agent the quartz sand to make the molding sand, makes the model with EPS or the PMMA foam plastics, in under the plastic film seal cindition, entire lets cast(vacuum degree 0.4-0.67MPa) carries on the liquid metal casting under the negative pressure condition, after the casting coagulates relieves the negative pressure then to obtain the superficial bright and clean casting.
2.7.3 resins granulated substance solid casting
Makes the molding sand using the resin granulated substance, makes the model with EPS or th PMMA foam plastics, under the normal temperature, the atmospheric pressure carries on the liquid metal casting but to make takes the casting, uses the solid casting the technical manufacture mold semifinished materials to have the size precision high(the ISO9 level), processing remainder small (generally about 5mm), does not need to pull out the mold ascent, does not need the making core and the sand core brace, saves the metal material, economical makes the wooden model the lumber, the manufacture cycle short, the cost is low. This technology suits large-scale, is complex, the single unit mold semifinished materials production. The ceramics fine cast, lose the cerotin to cast and so on the technology are increasing the mold semifinished materials precision, reduce the processing man-hour, reduce the manufacture cycle, reduce aspect and so on cost also demonstrate its unique superiority.
2.8 other aspects technologies
In order to simplify the mold the structural design, reduces the mold cost, reduces the mold manufacture cycle, in domestic and foreign also successively appeared some other aspects new technology application, like trades the mold frame, the ramming unit, the cutting edge built-up welding quickly, inlays the block casting, the nitrogen spring and so on.
2.8.1 nitrogen springs on mold application
The nitrogen spring is one kind ofnew elastic function part, replaces the spring, the rubber, the polyurethane or the air cushion with it side, it can accurately provide presses the strength, then may have the greatly initial ball pressure in the small space, does not need pre-tightly, is basically hit the pressure basically in the mold entire work process to be constant. The ball pressure size and the working point position may, accurate, conveniently adjust as necessary, simplifies the mold to stretch, nearby the pressure, ex-denning isostructuralism, simplifies the mold design, reduces the pattern making cycle, debugs the mold to be convenient, reduces the replacement mold time, enhances the production efficiency.
2.8.2 fast trades the mold technology
Because product variety increasing, causes the mold in the production the trainsmutation extremely frequently, how thereupon reduces the ramming equipment the down time, enhances the production efficiency, fast traded the mold technology to receive people’s attention.
At present developed industrial nation some big companies traded the mold speed to avhieve astonishing degree, whether had fast trades the mold technology to become for an enterprise technology advancement sign. The always tendency is reduces the mold to install on the equipment, to be fixed, the adjustment time, this both must give in the equipment structural design to consider, and must in the mold structural design, the standardized aspect consider,machine on work as far as possible placing machine under will do.
2.8.3 ramming units combination technology
The ramming unit combination technology is dies a resolve into each one simple unit the convention to die, according to the working procedure request, the arrangement combination, completes the many kinds of ramming working procedure when the identical inferior stroke the new craft equipment, the work the ramming unit not with the punch press slide joint, only needs the slide attack then to complete the ramming work. When independent employment it is 1 complete mold. It may use for to process the sheet or the molding punch holes, falls the material, cuts the angle, the grooving, shuts off and the shallow strethch and so on. Has the assembly strongly, the easy to operate, the versatility, the efficiency is quickly good and so on the characteristic, suits the multi-varieties specially, center the production.