摘要:
A tool 10 which is made by a method which efficiently allows internal passageways, such as passageway 50, which are at least partially circumscribed by thermally conductive material 103, to be formed in the tool 10, thereby allowing for enhanced cooling characteristics and allowing decreased cycle time and a reduced likelihood of damage to the formed object.
摘要:
Injection molding apparatus having a cavity insert (10) with integral inner and outer portions (136, 138) having a cooling fluid flow channel (166) extending therebetween. In a preferred embodiment, the cooling fluid flow channel (166) is formed by a groove (164) machined in the outer surface (162) of the inner portion (136). This brings the cooling fluid flow closer to the cavity (66) and improves cooling efficiency and reduces cycle time.
摘要:
In injection molding, a mold forms a wall member, which defines a cavity, by bringing together two mold halves. The cavity wall is formed by a specially machined cavity plate having built-in support columns, fins and ejector pins columns. The plate forms a passageway and in-out flow chambers on the opposite side from the cavity surface which completely surrounds the cavity where coolant or heating circulating carrier flows at high rates. The resulting flow of coolant/heating carrier at high rates can be controlled by special positioning of the flow chambers and creates added turbulence. The built-in support columns, fins and ejector pins also dramatically increase the area of contact of the flow carrier with the cavity plate. The design incorporates built-in support columns and fins which make possible a thinner cavity surface plate by adding strength and structural support to the cavity area. The exact arrangement and geometry of the built-in support columns, fins, and flow chamber depend on the part design and can be adjusted depending on the application to increase the uniformity and heat transfer rates. The plate design can be adapted to movable cores and stationary mold cavity cores.
摘要:
Injection molding apparatus having a cavity insert (10) with integral inner and outer portions (136, 138) having a cooling fluid flow channel (166) extending therebetween. In a preferred embodiment, the cooling fluid flow channel (166) is formed by a groove (164) machined in the outer surface (162) of the inner portion (136). This brings the cooling fluid flow closer to the cavity (66) and improves cooling efficiency and reduces cycle time.
摘要:
A mold assembly has a mold part with a plurality of elongated cavities therein forming the outer wall of a molded part and wherein a fluid cooled core is inserted within each of the elongated cavities having an outer surface forming the inner wall of the molded part and the fluid cooled core includes an inner surface having a plurality of circumferentially spaced, longitudinally directed ribs for reinforcing the fluid cooled core radially inwardly of the elongated cavities and along the length of said fluid cooled core to control core deflection. A fluid inlet pipe is located axially of the inner surface in spaced relationship thereto having one end thereof adapted to be connected to a source of coolant and including a second end thereon in communication with a plurality of circumferentially spaced passages formed between each of the longitudinally directed ribs and wherein each of the passages returns flow to an elongated annular passage between the fluid inlet pipe and the inner surface.
摘要:
Injection molding apparatus having a cavity insert (10) with integral inner and outer portions (136, 138) having a cooling fluid flow channel (166) extending therebetween. In a preferred embodiment, the cooling fluid flow channel (166) is formed by a groove (164) machined in the outer surface (162) of the inner portion (136). This brings the cooling fluid flow closer to the cavity (66) and improves cooling efficiency and reduces cycle time.
摘要:
If the surface of metallic mold should not be highly transcribed to the surface of product in injection molding the plastic products, the transcription defects such as weld, shrinkage, etc. are caused to the surface of product. Further, if the resin should be exposed to the surface of high temperature metallic mold more than necessary during the molding, the filler and the like of glass and so forth are contained into the resin, and in this case, they are left over on the surface of metallic mold, resulting in the transcription defect. These problems can be solved by heating the surface temperature of metallic mold higher than the glass transfer temperature of resin if the resin is non-crystal and higher than the fusion point temperature if the resin crystal, with the temperature raising speed of more than 2° C. every second, maintaining this temperature during the resin charging, and by cooling at the lowering speed of more than 2° C. every second after the completion of charging. This temperature control shall be conducted with the feed back control while detecting the surface temperature of metallic mold by the temperature detection sensor mounted at the position close to the surface of metallic mold.
摘要:
In a temperature-controllable tool (11) or mould for producing plastic mouldings with at least one cavity (12) to accept the mould of the plastic moulding to be produced, at least one inlet or outlet aperture (13, 14) which are interconnected via channels (15) and form a temperature-control agent channel system for cooling or heating the mould cavity (12), the shot time (cycle time) is shortened, maintenance is made easier and higher quality injection-moulded components are obtained in that the run of the channels (15) is matched to the outer shape of the mould cavity (12) and the geometry of the channels (15) is matched to the temperature profile in the plastic moulding. A process for making such a tool or mould comprises the following steps: separating the tool or the mould in the planes of the channels to be produced; producing the channels in accordance with the desired cycle in at least one separating surface of the opened tool or mould by milling or the like; and joining the separated parts of the tool or mould together.
摘要:
Mold for the injection molding of objects of large dimension and complicated surfaces from plastic material without internal stresses and with accurate dimension. In base plates of the mold cooling grids are embedded and the active surface of the base plates is provided with forming plates and forming strips with grooves for heating elements or tempering and cooling means. The mold is provided with mobile cores which change their positions in the course of shrinking of the solidifying plastic material.
摘要:
A mold includes a mold body, a porous conductive sheet and an electroformed metal. The porous conductive sheet is placed on a back surface of the mold body, has a plurality of through holes, and is conductive at least at its surface. The electroformed metal is electrodeposited on the back surface of the mold body and on the porous conductive sheet so as to fill and close the through holes of the porous conductive sheet. In the mold, an inner surface of the electroformed metal forms at least a part of an inner surface of a fluid passage through which fluid for temperature control flows.