CN101823316A

CN101823316A - Injection molding method, module and molded parts

Info

Publication number: CN101823316A
Application number: CN200910037526A
Authority: CN
Inventors: 简明辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-03-02
Filing date: 2009-03-02
Publication date: 2010-09-08

Abstract

The invention relates to an injection molding method, a module and molded parts. A plurality of molds which jointly form one module form at least one mold cavity for injecting a molten molding material; at least one of the molds comprises a base part and at least one pressurizing part; after the molding material is injected, the pressurizing part is additionally moved to extrude the molding material corresponding to the pressurizing part in the mold cavity to a predetermined density higher than that of the molding material corresponding to the base part; thus in the cooling process of the molding material, the molding material corresponding to the pressurizing part has high density and can not be bent easily; and in the cooling and shaping process of the molding material, the molding material corresponding to the pressurizing part can not be distorted easily. Thus, when at least one molded part is taken out respectively from a high density area, a low density area and a graded density area by demoulding, the molded part in the high density area can keep an ideal shape.

Description

Injection forming method, module and article shaped

Technical field

The present invention is about a kind of injection forming method, module and article shaped.

Background technology

As shown in Figure 1, a kind of common used module 1 of Jet forming machine for example comprises movably a male model 11 and a master mold 12 that is installed on the Machine basement, male model 11 is along the graphic direction of arrow, relatively move to master mold 12 and fit tightly, and constitute a die cavity that pours into for fusion mould material jointly; Inject the mould material by the hand-hole on the mould (figure does not show) again die cavity is filled up, the cooling of wait mould material is solidified, and male model 11 can be separated with master mold 12, by taking out article shaped in the die cavity.

Though this kind ejection forming technique is to the utmost is ripe, generally there is no the space of important breakthrough, yet the article shaped 5 of utilizing moulding module mentioned above to make, be illustrated in figure 2 as the plastic cement finished product that a slice for example has a plurality of different thickness areas, then following point can take place: in the manufacture process, fusion mould material is after filling up die cavity, treated its moulding with module by the cooling of progressively lowering the temperature, and begin to finish by the position of die cavity thinner thickness and solidify, die cavity thickness thicker part is then later to be solidified, and because of the still cooling contraction gradually of this position, and the convergent force that approaches position generation side direction to having finalized the design, the thin position that causes the plastic cement surface is warpage a little unpredictably, makes its surface produce ripples trace 51.

If the product of manufacturing is the casing surface or the screen light transmitting surface of the product of for example high unit price such as i-PHONE, high-order pen electricity, the appearance of this kind ripples trace 51, the appearance value that makes the output finished product is significantly reduced and be listed in defective products, this kind problem causes the product yield to descend undoubtedly, manufacturing cost explodes thereupon, becomes the difficult point in the manufacturing.

Relatively, other has manufacturer to propose to adopt the practice of the compound ejaculation of multiple mould material, and the multiple material that utilizes melt temperature to differ injects respectively via formed different hand-holes in the mould, make various mould material branches according to a side, the article shaped that a plurality of zoness of different of final cooling forming are formed.Yet this kind method not only is difficult for holding mutually because of storeroom, makes the easy impaired fracture of intersection, intersection also may form the irregular even slit of boundary, influence the firm degree of product appearance and structure, even shelter evil people and countenance evil practices, product appearance is tarnished at the place, slit; And because porous is injected, making fabrication schedule become complicated and expensive, reduce product competitiveness, is not a kind of good solution therefore.

Summary of the invention

Purpose of the present invention is providing a kind of injection forming method that can significantly reduce article shaped ripples trace generation probability.

Another object of the present invention is providing a kind of being difficult for to produce the ejection formation module of ripples trace because of the cooling of die cavity internal mold material successively makes article shaped.

A further object of the present invention is providing a kind of any surface finish and is not having the article shaped of ripples trace.

The present invention more has a purpose, and a kind of article shaped that is set with several density difference region is being provided.

A kind of injection forming method of the present invention, comprise the following step: a) constitute the module that is formed with at least one die cavity with a plurality of moulds, at least one in these moulds wherein comprises that a basic courses department and one can be relative to this basic courses department towards going deep into the pressurization part that this die cavity direction moves; B) inject fusion mould material to this die cavity; When c) treating that this mould material injects this die cavity and reaches a predetermined extent, move this pressurization part, make in this die cavity mould material that should pressurization part to be extruded into density to be higher than mould material that should basic courses department is reached a predetermined density; D) wait this mould material cooling and shaping in this die cavity; And e) with these mold separation and take out this typing finished product.

The present invention also is a kind of ejection formation module, comprises a plurality of moulds that are formed with at least one die cavity jointly; At least one in these moulds wherein, comprise that a basic courses department and at least one can be relative to this basic courses department towards going deep into the pressurization part that this die cavity direction moves, cause with this die cavity divide at least at least one to pressurised zone that should at least one pressurization part, one to base area that should basic courses department, and gradation zone between between this at least one pressurised zone and this base area.

A kind of especially ejection formation thing of the present invention comprises low density area that a slice comprises that at least one high density area, thickness is not less than this at least one high density area and density and is lower than this high density area, and the single material substrate of a density transition region between this at least one high density area and this low density area.

Utilize manufacture method of the present invention, molded article shaped, can significantly promote the smooth degree of molded surface and reduce the problem that the ripples trace constitutes, and make article shaped can see through the setting of mould, mold an article shaped that possesses the density regions that a highdensity transmission region and a suitable further processing installing are arranged, thereby not only conform to customer requirements, solve the problems referred to above of known forming method and module more simultaneously.

Description of drawings

Fig. 1 is the generalized section of common ejection formation module;

Fig. 2 is a cross-sectional schematic of utilizing the known article shaped of common module obtained by molding;

Fig. 3 is the schematic flow sheet of the injection forming method of first embodiment of the invention;

Fig. 4 is the ejection formation module of first embodiment of the invention, the generalized section before the charging;

Fig. 5 is the ejection formation module of first embodiment of the invention, the generalized section after the feed pressurization;

Fig. 6 is the ejection formation module of second embodiment of the invention, the generalized section before the charging;

Fig. 7 is the schematic flow sheet of the injection forming method of second embodiment of the invention;

Fig. 8 is the schematic top plan view of the article shaped that comprises a slice coating film of second embodiment of the invention.

Description of reference numerals

1 ... common module, 5 ... common article shaped, 51 ... the ripples trace, 2 ... module, 11,21 ... male model, 20,20 ' ... die cavity, 12,22 ... master mold, 23 ... steam vent, 201 ... base area, 202 ... pressurised zone, 203 ... gradation zone, 211 ... basic courses department, 212,212 ' ... pressurization part, 6 ... article shaped, 60 ... substrate, 61 ... low density area, 62 ... the density transition region, 63 ... high density area, 64 ... the coating film, 641 ... the coating film figure, 9 ... the mould material, 31-37,30 ', 31 ' ... step.

The specific embodiment

About addressing other technologies content, characteristics and effect before the present invention, in the following detailed description that cooperates with reference to graphic preferred embodiment, can clearly present.For convenience of description, the illustrative ejection formation module of the present invention only comprise on one, two moulds once; Certainly if the moulding module that utilizes content of the present invention to implement is arranged in a horizontal manner or more multi-mould, die cavity are arranged, the category that also all belongs to this case undoubtedly.

As Fig. 3, shown in the first embodiment of the invention, when step 31, earlier constitute module 2 with for example graphic upper and lower two mould matched moulds shown in Fig. 4,5, wherein be formed with one for the filling mould material, and include the die cavity 20 of base area 201, pressurised zone 202 and gradation zone 203, and in this example, the mould that is positioned at graphic top is a movably male model 21, and it has a basic courses department 211 and the pressurization part 212 that can move towards this die cavity 20 relative to this basic courses department 211; Graphic below then example is interpreted as a master mold 22.During step 32, the uniform mould material 9 of fusion is injected in the die cavity 20 and extracts gas in the die cavitys 20 by steam vent 23.

Hold, step 33 treats that mould material 9 injects die cavity 20 and reaches a predetermined extent, when filling up die cavity 20 in this example, then carry out step 34, begin to cool down entire module 2, because 9 coolings of mould material need could finalize the design through a period of time, therefore before mould material 9 is by formal typing, carry out step 35 shown in Fig. 5 (arrow), further the application of force moves pressurization part 212 downwards, make to be arranged in die cavity 20 the mould material 9 of pressurised zone 202 that should pressurization part 212 is additionally compressed, and be extruded into a predetermined high density; And continue these mould material 9 typings to this die cavity 20 of this module 2 of cooling in step 36.

Thus, with respect to mould material 9 that should basic courses department 211 positions, it is higher to be extruded into density corresponding to the mould material 9 of pressurization part 212, even as in this example, die cavity 20 thickness corresponding to basic courses department 211 are thicker, typing more slowly in cooling procedure, but in slow cooling and shaping process, because the mould material 9 of corresponding pressurization part 212 has been in highdensity typing state, the mould material 9 of then corresponding basic courses department 211 continues cooling and shrinks the side force that is applied, and is difficult the corrugated deformation of expressed water again of the mould material 9 of corresponding pressurization part 212.So can be smoothly wait mould material 9 cooling and shapings in the die cavity 20 in step 36, move in step 37 again and break away from master mold 22 male model 21, and the article shaped that taking-up has been finalized the design and finished.

Because the die cavity thinner thickness of corresponding pressurization part 212, generally can be used to moulding on thicker panel or the plastic shell slightly printing opacity pattern or with cooling after slightly be for example transparent region of contact panel of transparent plastic material moulding, and utilize technology of the present invention, it is very fast because of cooling velocity significantly to reduce thin originally pattern area or clear area, being subjected to the zone, next door still to continue cooling at last shrinks and the problem of crimp, thereby promote the qualification rate of article shaped, and thereby reduction product price.

Certainly, can understand easily as skilled person, above-mentioned forming process is not a kind of limitation, shown in Fig. 6,7,8 second embodiment of the invention, in matched moulds step 31 ' before, earlier in step 30 ', a slice coating film 64 is inserted in the die cavity 20 ', and with the figuratum part of coating film 64 printing towards die cavity 20 ' inboard, implement according to last embodiment subsequent step again, and in pressurization part 212 ' extra pressure process, also can repeatedly progressively exert pressure or repeat advance and retreat and exert pressure in response to particular demands.Make article shaped 6 in this example, become have thicker low density area 61, density transition region 62, the plastic slice substrate 60 in thin 63 3 kinds of zones of high density area, and the coating film 64 of its coating among Fig. 8 not only is painted with a coating film figure 641 of representing trade mark, and because be printed with pattern part by clipping between the diaphragm of mould material and coating film 64, can be not impaired by outside friction, thus guarantee the firm of pictorial trademark; High density, thickness are scheduled to and thin 63 of the high density areas of light-permeable are suitable for as the screen diaphragm.

The above only is preferred embodiment of the present invention, can not limit scope of the invention process with this, material such as aluminium for example, also can inject mould and use method of the present invention and the article shaped of moulding this case by same way as, promptly change and modify, still belong in the scope that patent of the present invention contains according to the present patent application claim and invention description simple equivalent that content is done.

Claims

1. an injection forming method is characterized in that, this method comprises the following step:

A) constitute the module that is formed with at least one die cavity with at least two moulds, at least one in these moulds wherein comprises that a basic courses department and one can be relative to this basic courses department towards going deep into the pressurization part that this die cavity direction moves;

B) inject fusion mould material to this die cavity;

When c) treating that this mould material injects this die cavity and reaches a predetermined extent, move this pressurization part, make in this die cavity mould material that should pressurization part to be extruded into density to be higher than mould material that should basic courses department is reached a predetermined density;

D) wait this mould material cooling and shaping in this die cavity; And

E) with these mold separation and take out this typing finished product.

2. the method for claim 1 is characterized in that, wherein this module more is formed with a steam vent, and this step b) more comprises the inferior step b1 that is extracted gas in the die cavity by this steam vent).

3. the method for claim 1 is characterized in that, wherein this step c) more comprises step following time:

C1) fill up this die cavity with fusion mould material and reach this predetermined extent; And

C2) move this pressurization part.

4. method as claimed in claim 3 is characterized in that, wherein this step d) more comprises step following time;

D1) in this time step c1) fill up this die cavity with fusion mould material after, begin to cool down this module;

D2) continue cooling this module to these moulds in this die cavity and anticipate type.

5. as claim 1,2,3 or 4 described methods, it is characterized in that, more be included in this step b) before, earlier a slice coating film is inserted the step f) in this die cavity.

6. an ejection formation module is characterized in that, this module comprises at least two moulds that are formed with at least one die cavity jointly; At least one in these moulds wherein, comprise that a basic courses department and at least one can be relative to this basic courses department towards going deep into the pressurization part that this die cavity direction moves, cause with this die cavity divide at least at least one to pressurised zone that should at least one pressurization part, one to base area that should basic courses department, and gradation zone between between this at least one pressurised zone and this base area.

7. module as claimed in claim 6 is characterized in that, wherein these moulds comprise a male model with at least one pressurization part and a basic courses department, and one to master mold that should male model.

8. ejection formation thing, it is characterized in that this article shaped comprises low density area that a slice comprises that at least one high density area, thickness is not less than this at least one high density area and density and is lower than this high density area, and the single material substrate of a density transition region between this at least one high density area and this low density area.

9. article shaped as claimed in claim 8 is characterized in that, more comprises the coating film that a slice is coated on this substrate and is printed on pattern towards this substrate-side.

10. article shaped as claimed in claim 8 is characterized in that, but wherein this high density area has one and causes the penetrating predetermined thickness of visible light part.