CN201538018U

CN201538018U - Die type cavity air extraction structure

Info

Publication number: CN201538018U
Application number: CN2009201389365U
Authority: CN
Inventors: 陈伟宏; 翁吉成
Original assignee: Xiamen Xinhongzhou Precision Technology Co Ltd
Current assignee: Xiamen Xinhongzhou Precision Technology Co Ltd
Priority date: 2009-06-18
Filing date: 2009-06-18
Publication date: 2010-08-04
Anticipated expiration: 2019-06-18

Abstract

The utility model discloses a die type cavity air extraction structure, which comprises a fixed die core, a movable die core, a fixed die plate, a movable die plate, a movable die backing plate and a fixed plate, wherein the fixed die core and the movable die core are respectively fixed on the fixed die plate and the movable die plate, the die plates are arranged on the fixed plate; an exhaust passage is formed in the die cavity and is communicated with the air extraction device after penetrating through the movable die core, the movable die plate and the movable die backing plate. In order to extract air in the cavity out to form negative pressure, a seal ring is arranged on a parting plane between the fixed die core and the movable die core and forms an enclosed space when being matched with the fixed die core and the movable die core. The utility model adopts the scheme that the peripheral sides of the die cores are sealed through seal rings, residual air in the die core type cavities is extracted by using an air extraction device during injection moulding, to ensure that moldings can not be affected by the air during moulding, so as to guarantee the quality of the moldings.

Description

The mold cavity structure of bleeding

Technical field

The utility model discloses a kind of mold cavity structure of bleeding, and belongs to mould production class manufacturing technology field.

Background technology

Injection mold is made finished product, is to be injected in the die cavity of mould with raw material, utilizes the change of moulding raw material physical state to realize the processing of article profile.If there is too much air to exist in the die cavity, and can't discharge fully, will inevitably have influence on the quality of processing article, it is bad and cause albefaction, burn and injection moulding insatiable hunger (promptly lacking material) to form easily exhaust, and in the injection moulding process, the space in the die cavity is occupied by raw material, if there is gas to exist in the die cavity, be bound to be extruded and produce high temperature, formed article just has and burns phenomenon and produce like this, thereby has influenced the quality of moulding product.

For with mobile fabulous very high products of forming materials required precision such as high-temperature nylons, very easily produce overlap, and be easy to generate a large amount of methane gas.Need enough big exhaust ditch from exhaust, but it is excessive so just to be easy to generate overlap; In order to solve the overlap problem, the exhaust ditch can only be reduced to 0.003-0.005mm, and methane gas is difficult to again discharge like this, and the exhaust ditch stops up easily.Contradiction between these two paradox of exhaust and overlap is sharp-pointed unusually, is difficult to solve.

In the die molding process, have gas in the die cavity, there are following two aspects in its source: due to the characteristics of first mould own, must be full of air in it when raw material do not enter die cavity, even moulding material is injected in the die cavity, still has little air and residue in it; It two is that raw material are plastic materials, is easy to generate gas in being heated to the process of high temperature, is difficult for discharging.

Owing to above reason, it is those skilled in the art and the problem that needs solution that the gas that produces in the mold cavity causes the quality problems of moulding product, so, the inventor is through research, practice, the structure of mould type intracavity gas is discharged in creation one, so, the proposition of utility model is just arranged.

Summary of the invention

At the deficiency that residual gas in the existing mold die cavity is difficult to discharge, the utility model provide a kind of rational in infrastructure, can remove in the mold cavity mold cavity of the air structure of bleeding.

The utility model is achieved through the following technical solutions:

The utility model comprises cover half core, moving-mould-core, solid plate, moving platen, dynamic model backing plate and fixed head, cover half core, moving-mould-core are individually fixed on solid plate, the moving platen, template is placed on the fixed head, wherein, be provided with the exhaust passage in the described mold cavity, this exhaust passage is passed moving-mould-core, moving platen, dynamic model backing plate and is communicated with air extractor.

For making the gas in the die cavity be drawn out of and form negative pressure, the die joint between cover half core, moving-mould-core is provided with sealing ring, forms the space of a sealing in the cover half core, when moving-mould-core cooperates.

Described sealing ring is arranged on the moving-mould-core.

The utility model at first gets up all sides of core rod with seal ring seal, in injection moulding process, residual gas in the core rod die cavity and methane gas are extracted out and formed negative pressure with air extractor, and make the easier filling and be difficult for burning in forming process of moulding product, thereby guaranteed the quality of moulding product.

Description of drawings

Fig. 1 is the utility model dynamic model floor map;

Fig. 2 is the utility model cover half floor map;

Fig. 3 is a dynamic model A-A sectional view;

Fig. 4 is the forward part moulding product of bleeding;

Fig. 5 is the rear section moulding product of bleeding;

Wherein, 1, the cover half core, 2, moving-mould-core, 3, solid plate, 4, moving platen, 5, the dynamic model backing plate, 6, fixed head, 7, the exhaust passage, 8, sealing ring, 9, sealing ring.

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

Embodiment: the utility model comprises cover half core 1, moving-mould-core 2, solid plate 3, moving platen 4, dynamic model backing plate 5 and fixed head 6, cover half core 1, moving-mould-core 2 are individually fixed on solid plate 3, the moving platen 4, moving platen is placed on the fixed head 6, wherein, be provided with exhaust passage 7 in the described mold cavity, this exhaust passage 7 is passed moving-mould-core 2, moving platen 4, dynamic model backing plate 5 and is communicated with air extractor.For making the gas in the die cavity be drawn out of and form negative pressure, the die joint between cover half core 1, moving-mould-core 2 is provided with sealing ring 8, forms the space of a sealing in the cover half core, when moving-mould-core cooperates.Sealing ring 8 is arranged on the moving-mould-core.

As shown in Figure 1 and Figure 2,8 die cavities are arranged respectively on dynamic model and the cover half, become two rows, four column distributions, it is provided with four exhaust passages, and a passage is connecting two die cavities, and as Fig. 3, four exhaust passages are passed moving platen and are communicated with by the air exhauster of exhaust outlet with the external world.Dynamic model core rod periphery seals with sealing ring, and sealing ring must be higher than core surface, and guaranteeing not having again outside air to enter in the die cavity behind the matched moulds, and the cover half die face is smooth smooth, does not do any bleeding.Article four, the route of bleeding is ceaselessly released the gas in the die cavity by air exhauster.Seal with sealing ring 9 between workpiece and the workpiece, prevent in the pumping process that outside air enters the die cavity influence effect of bleeding.

Contrast sees that the long pin of the goods after bleeding burns situation and has clear improvement than the goods of not bleeding among Fig. 4 as Fig. 4, Fig. 5, and products surface quality is than the smooth exquisiteness of meeting before.The trend that the continuous situation of burning of producing the 8H goods does not develop to serious direction.

The above record only for utilizing the embodiment of this origination techniques content, anyly is familiar with modification, the variation that this skill person uses this creation to do to do, and all belongs to the claim of this creation opinion, and is not limited to those disclosed embodiments.

Claims

1. mold cavity structure of bleeding comprises cover half core, moving-mould-core, solid plate, moving platen, dynamic model backing plate and fixed head, and cover half core, moving-mould-core are individually fixed on solid plate, the moving platen, and template is placed on the fixed head, it is characterized in that:

Be provided with the exhaust passage in the mold cavity that moving-mould-core and cover half core form, this exhaust passage is passed moving-mould-core, moving platen, dynamic model backing plate and is communicated with air extractor.

2. the mold cavity according to claim 1 structure of bleeding, it is characterized in that: the die joint between described cover half core, the moving-mould-core is provided with sealing ring, the space of cover half core, formation one sealing when moving-mould-core matches makes the gas in the mold cavity be drawn out of and form negative pressure.

3. the mold cavity according to claim 1 structure of bleeding, it is characterized in that: described sealing ring is arranged on the moving-mould-core.