CN101780704A

CN101780704A - Double-layer injection mold

Info

Publication number: CN101780704A
Application number: CN200910095719A
Authority: CN
Inventors: 王春方; 李过; 梁正华
Original assignee: Zhejiang Kaihua Mould Co Ltd
Current assignee: Zhejiang Kaihua Mould Co Ltd
Priority date: 2009-01-16
Filing date: 2009-01-16
Publication date: 2010-07-21

Abstract

The invention discloses a double-layer injection module, which comprises mold cores and mold cavities, wherein the mold cores and the mold cavities form two or more than two product molding chambers; the mold cores are driven by an ejecting mechanism; the outer walls of the mold cavities are provided with pouring openings; and one end of each pouring opening is communicated with one molding chamber and the other ends of the pouring openings are communicated with a hot runner plate connected with a spray nozzle of an injection machine. The double-layer injection module is characterized in that: the mold cores and the mold cavities are both comprised of upper and lower layers; the upper-layer mold core and the upper-layer mold cavity are positioned above the hot runner plate; the lower-layer mold core and the lower-layer mold cavity are positioned below the hot runner plate; products in an upper-layer molding chamber and a lower-layer molding chamber are driven by the ejecting mechanism respectively; a branch runner is formed in the middle part of the hot runner plate; the branch runner is communicated with the spray nozzle of the injection machine through a main spray nozzle; the upper and lower wall faces of the branch runner are provided with plastic flow holes respectively; the upper plastic flow holes are communicated with the pouring opening of the upper-layer mold cavity through a first hot spray nozzle respectively; the lower plastic flow holes are communicated with the pouring openings on the lower-layer mold cavity through a second hot spray nozzle; and auxiliary mold opening mechanisms are arranged on the left and right two sides of the hot runner plate respectively.

Description

Double-layer injection mold

Technical field

The present invention relates to mould of plastics, particularly relate to double-layer injection mold, belong to the mould of plastics field.

Background technology

Because plastic product forming is fast, so comparatively fast developed.The forming method of plastic products has a lot, as injection moulding, extrusion molding, blowing etc.The profiled part of injection mold comprises die cavity and core, die cavity and core constitute the die cavity of goods, in order to enhance productivity, generally in die cavity and core, arrange a plurality of die cavitys, thereby realize a plurality of goods of one-shot forming, go out three as usually said one, one goes out the fourth class, after but the die cavity number increases, especially when the die cavity number is many especially, go out 12 as one, one goes out 16 etc., will inevitably increase the length and width size of mould greatly, cause take up room many, and the length and width size of mould become big after, just can't be installed on the small-sized injector, if and select large-scale injector for use, can increase the injection moulding cost greatly again.

Summary of the invention

The objective of the invention is provide an a kind of depanning rate many, and the length and width size of mould to be little in order to overcome the shortcoming that prior art exists, compact conformation still can be suitable for small-sized injector, thereby reduces the double-layer injection mold of injection moulding cost.

The technical scheme of double-layer injection mold of the present invention is: comprise core and die cavity, core and die cavity constitute the die cavity of goods, described die cavity is two or more, core is driven by ejecting mechanism, the outer wall of die cavity is shaped on cast gate, one of cast gate is communicated with die cavity, the other end of cast gate is communicated with hot runner manifold, hot runner manifold connects the nozzle of injector, it is characterized in that described core and die cavity are for two-layer up and down, upper strata core and upper strata die cavity be positioned at hot runner manifold above, lower floor's core and lower floor's die cavity be positioned at hot runner manifold below, each free ejecting mechanism of the goods in upper strata die cavity and the lower floor's die cavity drives; The middle part of described hot runner manifold is shaped on runner; runner communicates with the nozzle of injector through main burner; the upper and lower wall of runner is shaped on the creeping hole separately; last creeping hole communicates by the cast gate of hot nozzle first with the upper strata die cavity respectively; following creeping hole communicates with the cast gate of lower floor die cavity by hot nozzle second respectively, and the left and right sides of hot runner manifold is installed auxiliary die opening mechanism separately.

Double-layer injection mold of the present invention, compared with the prior art, the most outstanding improvement structure is all to be provided with profiled part up and down at hot runner manifold, be upper strata core and upper strata die cavity and lower floor's core and lower floor's die cavity, each free ejecting mechanism of the goods of upper strata die cavity and lower floor's die cavity drives, the cast gate of upper strata die cavity and lower floor's die cavity is communicated with hot runner manifold separately, by two-layer cast simultaneously, die sinking simultaneously, production efficiency improves greatly, and compare with single layer structure, the length and width size of mould is dwindled greatly, and mould is occupied little space, can be installed on the small-sized injector again, thereby the injection moulding cost of avoiding using large-scale injector to cause increases.For example once go out the mould of 16 moulds, prior art is that all die cavitys all are placed on same one deck, and the mould of the technical program is to divide two-layer placement all die cavitys, arranges 8 for every layer, and obviously, die length and width approximately can dwindle half.During injection moulding, molten plastic enters runner the hot runner manifold from the nozzle of injector, again in each die cavity of upper and lower layer is guided in the upper and lower creeping hole of runner, and cooling forming.During the demoulding, injection moulding machine mould open at first, make lower floor's core break away from lower floor's die cavity, the upper strata core breaks away from the upper strata die cavity, at this moment mould separately is three sections states, hypomere is lower floor's core and its ejecting mechanism, the stage casing is lower floor's die cavity, hot runner manifold and upper strata die cavity, epimere is upper strata core and its ejecting mechanism, because injector is fixed, be actually and do not move so be installed on the upper strata core of one at nozzle of injection machine and its ejecting mechanism, and then eject upper and lower two-layer goods by ejecting mechanism separately.

Double-layer injection mold of the present invention; its described auxiliary die opening mechanism comprises the gear that is installed in the hot runner manifold sidewall; the both sides, front and back of gear are meshed with cover half tooth bar and dynamic model tooth bar separately; one of the cover half tooth bar fixes with the upper strata core; one of the dynamic model tooth bar fixes with lower floor's core; adopt pinion and rack, guarantee two-layer synchronous die sinking up and down, security of operation, reliable.Its described gear is installed protective cover outward, avoids gear to damage.The upper surface of its described hot runner manifold and lower surface are shaped on heating tank separately, and heater is installed in the heating tank, help to make the molten plastic flows in the hot runner manifold smooth and easy, prevent to solidify.Its described ejecting mechanism comprises continuous last ejector retainner plate and following ejector retainner plate separately, between last ejector retainner plate and the following ejector retainner plate push rod is installed, the head of push rod contacts with goods, the affixed separately oil cylinder in the both sides of following ejector retainner plate, this is the mode that adopts push rod to eject, and also can adopt ejector sleeve, push pedal, the multicomponent demoulding and air pressure, hydraulic pressure to eject.

Description of drawings

Fig. 1 is the perspective view of double-layer injection mold of the present invention;

Fig. 2 is the cross-sectional schematic of double-layer injection mold of the present invention;

Fig. 3 is a hot runner manifold and the assembling schematic perspective view of two-layer profiled part up and down;

Fig. 4 is a hot runner manifold and the assembling cross-sectional schematic of two-layer profiled part up and down;

Fig. 5 is the structural representation of hot runner manifold.

The specific embodiment

The present invention relates to a kind of double-layer injection mold, as Fig. 1-shown in Figure 5, comprise core and die cavity, core and die cavity constitute the die cavity of goods, described die cavity is two or more, core and die cavity can wholely be made, but because the required material of die cavity and core is better, in order to save the precious metal material, reduce cost, generally die cavity and core split are made, as Fig. 3, shown in Figure 4, promptly make separately and insert being used for the die cavity of moulding section and core, be bumped in impression bolster and the core fixing plate inserting again, and impression bolster and core fixing plate can adopt common material, when the die cavity number more for a long time, cavity block and core are inserted and also are polylith, constitute a die cavity separately, goods in the die cavity are driven by ejecting mechanism, the outer wall of die cavity is shaped on cast gate, one of cast gate is communicated with die cavity, the other end of cast gate is communicated with hot runner manifold, hot runner manifold connects the injector nozzle, it is characterized in that described core and die cavity are for two-layer up and down, upper strata core 11 and upper strata die cavity 12 be positioned at hot runner manifold 3 above, lower floor's core 21 and lower floor's die cavity 22 be positioned at hot runner manifold 3 below, upper strata die cavity 10 and lower floor's die cavity 10 ' interior each free ejecting mechanism 41 of goods, 42 drive; The middle part of described hot runner manifold 3 is shaped on runner 31; (injector generally is that employing is horizontal to runner 31 through the nozzle of main burner 32 and injector; but for convenience of description; mould 90 degree have been rotated; make connect the injector nozzle one head-up) communicate; the upper and lower wall of runner 31 is shaped on the creeping hole separately; last creeping hole 33 communicates by the cast gate of hot nozzle first 34 with upper strata die cavity 12 respectively; following creeping hole 35 communicates by the cast gate of hot nozzle second 36 with lower floor die cavity 22 respectively, and the left and right sides of hot runner manifold 3 is installed auxiliary die opening mechanism separately.The injection mold of the technical program compared with the prior art, the most outstanding improvement structure is all to be provided with profiled part up and down at hot runner manifold 3, be upper strata core 11 and upper strata die cavity 12 and lower floor's core 21 and lower floor's die cavity 22, as shown in Figure 4, upper strata core 11 and upper strata die cavity 12 constitute upper strata die cavity 10, lower floor's core 21 and lower floor's die cavity 22 formation lower floor die cavitys 10 ', upper strata die cavity 10 and lower floor's die cavity 10 ' interior each free ejecting mechanism 41 of goods, 42 drive, the cast gate of upper strata die cavity 12 and lower floor's die cavity 22 is communicated with hot runner manifold 3 separately, by two-layer cast simultaneously, die sinking simultaneously, production efficiency improves greatly, and compare with single layer structure, the length and width size of mould is dwindled greatly, and mould is occupied little space, can be installed on the small-sized injector again, thereby the injection moulding cost of avoiding using large-scale injector to cause increases.For example once go out the mould of 16 moulds, prior art is that all die cavitys all are placed on same one deck, and the mould of the technical program is to divide two-layer placement all die cavitys, arranges 8 for every layer, and obviously, die length and width approximately can dwindle half.During injection moulding, molten plastic enters runner 31 hot runner manifold 3 from the nozzle of injector, again in each die cavity of upper and lower layer is guided in the upper and lower

creeping hole

33,35 of runner 31, and cooling forming.During the demoulding, injection moulding machine mould open at first, make lower floor's core 21 break away from lower floor's die cavity 22, upper strata core 11 breaks away from upper strata die cavity 12, at this moment mould separately is three sections states, hypomere is lower floor's core 21 and its ejecting mechanism 42, the stage casing is lower floor's die cavity 22, hot runner manifold 3 and upper strata die cavity 12, epimere is upper strata core 11 and its ejecting mechanism 41, because injector is fixed, be actually and do not move so be installed on the upper strata core 11 of one at nozzle of injector and its ejecting mechanism 41, and then by separately ejecting

mechanism

41,42 eject, following two-layer goods.Its described auxiliary die opening mechanism comprises the gear 6 that is installed in hot runner manifold 3 sidewalls; the both sides, front and back of gear 6 are meshed with cover half tooth bar 7 and dynamic model tooth bar 8 separately; one of cover half tooth bar 7 fixes with upper strata core 11; one of dynamic model tooth bar 8 fixes with lower floor's core 21; adopt pinion and rack; guarantee two-layer synchronous die sinking up and down, security of operation, reliable.Its described gear 6 outer protective covers 9 of installing avoid gear to damage.The upper surface of its described hot runner manifold 3 and lower surface are shaped on

heating tank

37,38 separately, and heater is installed in the

heating tank

37,38, help to make the molten plastic flows in the hot runner manifold smooth and easy, prevent to solidify.In actual manufacture process, the runner 31 of hot runner manifold 3 can only be holed since an end face, and can't hole from the centre, cause runner not seal like this, be difficult to pressurize,, prevent that molten plastic from overflowing from oral area so must block oral area, as shown in Figure 5, adopt plug 29 that each oral area is blocked.As shown in Figure 2, its described

ejecting mechanism

41,42 comprise continuous last ejector retainner plate 45 and following ejector retainner plate 46 separately, push rod 49 is installed between last ejector retainner plate 45 and the following ejector retainner plate 46, the head of push rod 49 contacts with goods, the affixed separately oil cylinder 47 in the both sides of following

ejector retainner plate

46,48,

oil cylinder

47,48 are upside-down mounting, be that piston rod maintains static, and movement of cylinder block, concrete structure is affixed last compound plate 55 of the piston rod of oil cylinder and following compound plate 56 (it is motionless that last compound plate 55 and following compound plate 56 are fixed on the injection machine), its cylinder body connects ejector retainner plate 46 down, makes, following

ejector retainner plate

45,46 motions together.Except push rod ejects, can adopt that also ejector sleeve, push pedal, the multicomponent demoulding and air pressure, hydraulic pressure eject etc.

Claims

1. double-layer injection mold, comprise core and die cavity, core and die cavity constitute the die cavity of goods, described die cavity is two or more, core is driven by ejecting mechanism, the outer wall of die cavity is shaped on cast gate, one of cast gate is communicated with die cavity, the other end of cast gate is communicated with hot runner manifold, hot runner manifold connects the injector nozzle, it is characterized in that described core and die cavity for two-layer up and down, upper strata core (11) and upper strata die cavity (12) be positioned at hot runner manifold (3) above, lower floor's core (21) and lower floor's die cavity (22) be positioned at hot runner manifold (3) below, each the free ejecting mechanism (41 of goods in upper strata die cavity (10) and the lower floor's die cavity (10 '), 42) drive; The middle part of described hot runner manifold (3) is shaped on runner (31); runner (31) communicates with the nozzle of injector through main burner (32); the upper and lower wall of runner (31) is shaped on the creeping hole separately; last creeping hole (33) communicates by the cast gate of hot nozzle first (34) with upper strata die cavity (12) respectively; following creeping hole (35) communicates by the cast gate of hot nozzle second (36) with lower floor's die cavity (22) respectively, and the left and right sides of hot runner manifold (3) is installed auxiliary die opening mechanism separately.

2. double-layer injection mold as claimed in claim 1; it is characterized in that described auxiliary die opening mechanism comprises the gear (6) that is installed in hot runner manifold (3) sidewall; the both sides, front and back of gear (6) are meshed with cover half tooth bar (7) and dynamic model tooth bar (8) separately; one of cover half tooth bar (7) fixes with upper strata core (11), and of dynamic model tooth bar (8) fixes with lower floor's core (21).

3. double-layer injection mold as claimed in claim 2 is characterized in that the outer protective cover (9) of installing of described gear (6).

4. double-layer injection mold as claimed in claim 1 is characterized in that the upper surface of described hot runner manifold (3) and lower surface are shaped on heating tank (37,38) separately, and heater is installed in the heating tank (37,38).

5. double-layer injection mold as claimed in claim 1, it is characterized in that described ejecting mechanism (41,42) comprises continuous last ejector retainner plate (45) and following ejector retainner plate (46) separately, between last ejector retainner plate (45) and the following ejector retainner plate (46) push rod (49) is installed, the head of push rod (49) contacts with goods, the affixed separately oil cylinders in the both sides of following ejector retainner plate (46) (47,48).