CN2272807Y - Improved plastic moulding mould - Google Patents

Abstract

The utility model relates to a plastic working mould. The utility model is mainly suitable for solid moulded products. The utility model mainly comprises a female mould plate, a male mould plate, an upper fixed plate, a lower fixed plate, an ejector mechanism, a slide block and a mould cavity to be shaped. The utility model is characterized in that a flow blocking buffer gear is arranged in the male mould plate, the buffer gear has an ejecting casing tube provided with an elastic straight pin entering the mould cavity in order to block and resist jet streams, and the jet streams can be uniformly filed in the mould cavity. Blemishes on the surface of an object to be shaped can not be formed.

Description

Improved mould for plastics

The utility model relates to a kind of plastic processing mould

The product of all rigid plastics moulding, it is transparence because of itself; So pay attention to very much the bright of surface, whether it becomes clear, and its surface quality is non-homogeneous when being moulding, if can't obtain best surface, then the plastic products after the moulding can produce beauty defects, as shown in Figure 1, the lines 111 of surface imperfection appears in a plastic stamp 10 in its shank 11 places, and the surface of shank 11 is also smooth inadequately, fuzzy shape is arranged and influences quality.Cause the reason of this phenomenon be via cast gate enter in the pattern die cavity flow process as shown in Figure 2, melting plastics injection stream will be solidified parietal layer and be torn, injection stream can unhinderedly enter in this kind of cave 23, this will cause the surface of plastic products defect of moulding, that is above-mentioned Fang Yi makes and solidifies parietal layer displacement, sliding layer can occur, cause the defect that moulding is produced.

For another shown in Figure 3, it is a kind of flow process of the offset type heart, this kind mode can obtain best molded surface, its mainly be type cave 23 ' in, if a type heart 232 ', the type heart 232 ' opposing jet forms impedance thus, moulding material be folded to type wall 231 ', can avoid the danger that parietal layer tears and obtain the surface of the best.

Though but the method can obtain best plastic shaping surface, but can't be suitable in the right general mould type cave, its reason is the product design that a mould type cave is used for having designed, will design a type wall promptly will influence the face shaping and the size of its shaped article more, and can't carry out product design by theory, in fact this method and theory can't be applied on the present product.Other has the argument of " spraying and screw action ", " this effect can make plastics produce flowing full and cause joint line; the thickness of cast gate; the position can make molten plastic leave the cast gate backlash and produce the equal uniform flow of plastics and enter in the die cavity to mold surfaces; can prevent injection and screw action; cast gate thickness is the 40-60% that moulds thing thickness usually; " " thickness of general goods seldom surpasses 8mm's; though product thickness must not be less than its minimum limit value; also can not be excessive; otherwise; too much increase cost even do not consider its materials; also very unfavorable in others ", as because of thickness increases, plastics reach the molding temperature time and solidify required time and all will increase, to be unfavorable for the raising of productivity ratio, because of the increase of thickness, the time that begins to solidify is also inconsistent again, and it is bigger that front and back differ, thereby make product increase internal stress and consequently cause nest line and warpage, even the density of each several part is also variant.If as seen the thickness of shaped article is a lot of greater than the cast gate bore, as shown in Figure 4, die cavity 1 is a seal shank shape, and the bore of cast gate 2 is a lot of less than the seal shank, promptly has above-mentioned situation and occurs and can't be improved.

The purpose of this utility model is to provide a kind of improved mould for plastics, makes the plastic product surface of moulding can obtain best completed state, lowers parietal layer and tears generation and prevent the product joint line.

The utility model is to realize like this, the utility model is mainly used in the moulding of plastics handle, mainly include caster, the male model plate, last fixed form, following fixed form, ejecting mechanism, the die cavity of the slide block and the moulding of wanting, it is characterized in that being provided with in the male model plate baffle buffer gear, it is fixed in the liftout plate of ejecting mechanism, the formation of baffle buffer gear is inserted in one by the tip always and is ejected in the sleeve pipe, be provided with symmetrical straight trough and eject sleeve pipe lower semisection appropriate location, penetrate for the bar of keeping out of location perpendicular to the straight tip, keep out bar and put a spring with the set garden of the not end interannular that ejects sleeve pipe, order is directly sent has telescopic moving elastic force, directly sends collapsing length less than the die cavity length overall.In view of the above, directly send to enter in the die cavity, the molten plastic that cast gate is injected is subjected to directly sending keeps out and forms the impedance of plastics injection stream, and moulding material is folded to die cavity type wall, avoids the plastic shaping sliding layer to occur and produces eddy current, and obtain best finished product product.

The utility model compared with the prior art, its advantage is that flexible up and down directly the sending of elastic force enters die cavity, and the molten plastic that cast gate is injected is subjected to impedance and flows to the type wall, has avoided article shaped to produce sliding layer, lower the generation that parietal layer is torn, guaranteed product quality.

Description of drawings

Fig. 1 is the schematic diagram of known plastic seal beauty defects

Fig. 2 is for easily causing the moulding die cavity generalized section that the plastics parietal layer is torn

Fig. 3 is for being provided with the generalized section of the type heart in die cavity

Fig. 4 is a filled plastics schematic diagram in the known technology mould

Fig. 5 is the mould front-view schematic diagram during filled plastics not of the utility model one preferred embodiment

Fig. 6 is the front-view schematic diagram in the mould filled plastics of the utility model one preferred embodiment

Fig. 7 is the schematic side view behind the mould filled plastics of the utility model one preferred embodiment

Fig. 8 obtains the optimum state schematic perspective view for the seal surface of the utility model preferred embodiment

The figure number of Fig. 5-8:

30-mould, 31-upper mounted plate, 32-caster

33-slide block, 34-male model plate, 35-backing plate

36-bottom plate, 371-liftout plate 372-eject backboard

38-tiltedly tip 39-running channel 391-cast gate 331-die cavity 321-type wall 40-baffle buffer gears

41-eject the sleeve pipe 42-straight tip 43-spring

21-keep out bar 411-straight trough

Accompanying drawing is described in conjunction with the embodiments

As Fig. 5, shown in 6, the utility model is applicable to that the cast gate bore of ejaculation is below 50% of processed plastic products thickness, the handle size of moulding is greater than the solid plastic finished product of 16mm, in mould 30, be provided with a baffle buffer gear 40, mould 30 is similar with known general mould design, include upper mounted plate 31, caster 32, male model plate 34, backing plate 35 and bottom plate 36, ejecting mechanism (pre-ejecting plate 371, eject backboard 372), be positioned at a side of upper mounted plate 31, the running channel 39 that molten plastic is arranged, running channel 39 passes straight through in the caster 32, still there is slide block 33 to be divided into both sides in the caster 32, has die cavity 331 in the slide block 33,31 of slide block 33 and upper mounted plates are provided with an oblique tip 38, die cavity 331 front ends and running channel 39 are connected to form a cast gate 391, and be provided with a baffle buffer gear 40 in the male model plate 34, this baffle buffer gear 40 is limited in the male model anti-34, its end encircles in 412 liftout plates 371 that are positioned on the bottom plate 36 for the protrusion garden and ejects on the backboard 372, baffle buffer gear 40 is to eject with one to insert the tip 42 always in the sleeve pipe 41, ejector sleeve degree 41 lower semisection appropriate locations axially are arranged with straight trough 411, straight trough 411 is kept out bar 421 for one and is worn not in interior, and keep out bar 421 vertical fixing in the straight tip 42 appropriate locations, keep out bar 421 to the garden ring 412 that ejects sleeve pipe 41 simultaneously and do not hold a sheathed spring 43, spring 43 is subject to keeps out bar 421 and garden ring 412, the straight tip 42 can have elastic force and move around, the then straight tip 42 does not protrude from and ejects outside the sleeve pipe 41 when stressing, be under pressure and do the time spent, the straight tip 42 retraction gradually ejects sleeve pipe 41 and arrives and give allocation.

The combining structure that nationality is above-mentioned, the utility model mainly is applicable on the solid shaped article, when the fused raw material of plastics Jet forming machine through running channel 39, when cast gate 391 enters in the die cavity 331, the straight tip 42 of baffle buffer gear 40 is positioned at die cavity 331, during the plastics injection stream injected, the straight tip 42 stops injection stream, and form injection stream impedance shown in Figure 6, melted material is filled up to the type wall 321 of die cavity 331, be injected to equably in the die cavity 331 and cooperate with the time-pressure-temperature of moulding, enlarge at leisure again and be filled in the whole die cavity 331 (as shown in Figure 7), the straight tip 42 still was subjected to the effect of injection stream pressure and shrank back backward this moment, tore up to shrinking back to parietal layer) or eddy current.So can be as shown in Figure 7, the inside and outside plastic shaping of this moulding seal be full, treats its smooth surface after the fusion plastic cool, conform to the design principle of mould die cavity fully, product is ejected after the die sinking, and the straight tip 42 protrudes from outside the sleeve pipe 41 again, within the die cavity 331, so come and go and treat ejection formation next time.

Because the design of the mould of general article shaped is so the utility model need not change die cavity (article shaped shape), as long as install the phenomenon that baffle buffer gear 40 can improve common generation beauty defects additional in mould.

Claims (1)

1, a kind of improved mould for plastics, mainly contain caster, the male model plate, last fixed form, following fixed form, ejecting mechanism, the die cavity of the slide block and the moulding of wanting, it is characterized in that being provided with in the male model plate (34) a baffle buffer gear (40), baffle buffer gear (40) is fixed in the liftout plate (371) of ejecting mechanism, the formation of baffle buffer gear (40) is inserted in one by the tip (42) always and is ejected in the sleeve pipe (41), be provided with keep out the straight trough (411) that bar (421) penetrate of the confession location of symmetry and eject sleeve pipe (41) lower semisection appropriate location perpendicular to the straight tip (42), put one between the not end of keeping out bar (421) and ejecting sleeve pipe (41) and set garden ring (412) and make the straight tip (42) have the spring of telescopic moving elastic force (43), directly the tip (42) collapsing length is less than die cavity (331) length overall.

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