CN102416690B - Mold for evaluating appearance of plastic - Google Patents
Mold for evaluating appearance of plastic Download PDFInfo
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- CN102416690B CN102416690B CN201110400720.3A CN201110400720A CN102416690B CN 102416690 B CN102416690 B CN 102416690B CN 201110400720 A CN201110400720 A CN 201110400720A CN 102416690 B CN102416690 B CN 102416690B
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Abstract
The invention discloses a mold for evaluating appearance of plastic. The mold comprises a movable mold and a fixed mold, wherein the surface of a mold cavity formed by closing the movable mold and the fixed mold is a smooth interface subjected to polishing treatment by No.6000 diamond paste. The mold has the advantages that: 1, the mold cavity subjected to polishing treatment can be better applied to the evaluation of the surface smoothness and gloss of a product; 2, a plurality of sprues can evaluate defects which easily occur nearby the sprues simultaneously; and 3, a plurality of scales, blind holes and through hole circular rings can be used for increasing the gloss and sensitivity of a material, so that the surface gloss of the material is enhanced, and the contraction performance of the material is measured.
Description
Technical field
The present invention relates to a kind of Design of Dies field, evaluate especially for plastic material Injection moulded part appearance property.
Background technology
Injection mo(u)lding is processing method the most frequently used in plastic processing, its injection moulding process is, first solid-state plastic cement is melted for molten condition, under screw in injection molding machine pressure impetus, melten gel is full of mold cavity through mold runner and cast gate subsequently, then experience lasting high pressure, in die cavity, being pressed into more melten gel, in order to shrink brought reduction in bulk in compensative material cooling procedure, is finally to open mould to take out product.On the one hand, in injection moulding process, plastic cement has experienced complicated thermodynamics course, affects material appearance factor varied; On the other hand, along with the development of plastic cement industry, also complicated all the more various in Injection moulded part design, require also more and more higher to plastic cement product, particularly open defect requirement is strict all the more, and these all develop suitable material to the modification application of plastic cement and propose higher requirement.The method that in the past solved material appearance defect is all by repeatedly at customers' place test portion conventionally, in test portion process, constantly pinpoint the problems and improve again material, this processing problem mode is consuming time longer, waste material and artificial, takies customer resources and does not often have grace time to scrutinize the root place of problem; Another kind method is to use the apparent condition that utilizes colour table mould simple in structure to observe material in laboratory, but the colour table appearance effect obtaining often has larger difference with the product that adopts complicated die moulding.
Summary of the invention
The present invention discloses the mold for evaluating appearance of plastic of a kind of convenience, practicality, evaluates for plastic material moulding appearance property.
A kind of mold for evaluating appearance of plastic, the closed mold cavity surface forming of dynamic model and cover half is through the polishing of the above diamond cream of 6000#; Offer mold temperature control medium flow passage at dynamic model and cover half apart from cavity surface a distance, and the heat transfer medium control mold surface temperature that utilizes external die heater to carry.
In injection moulding process, utilize heat transfer medium heating cavity surface to different temperature, can assessment material to the sensitivity that high optical mode face copies, product glossiness, surperficial albefaction change with Shooting Technique, and then determine the good required Shooting Technique scope of product of forming materials outward appearance of evaluating.
After active and inactive mold closure, form two die cavities of A and B, on each die cavity, offer five cast gates.On mould dynamic model, offer gating insert installation site, install on sprue mold insert wherein and have four kinds of different gate forms and size, the 5th cast gate is directly opened on dynamic model the position with front four cast gate apart from each others.Cast gate is connected with sprue by runner, offers many places flow control valve on runner.This design can evaluate present cast gate defect around, as the defects such as cast gate is dizzy, spray line, cold burden spot, injection trace, the sensitiveness changing with gate form, size and machined parameters; Open mould go forward in four cast gates any one and the 5th cast gate by adjusting flow control valve, can form welding area in mouldings corner, and then assessment material welding indenture obvious degree, weld mark color and product main body color distortion, weld mark both sides color distortion are with the sensitiveness of gate form, size, molding parameter variation.
Because easily violent turning point occurring at flow direction in mold filling process, plastic cement there is albefaction, thereby each die cavity has 90 ° of corner structures and 90 ° of folded edges, these 90 ° of corner structures and folded edges all can be used for evaluating material flow divert and produce stress whitening obvious degree.
A die cavity and Type B chamber all adopt gradient thickness design, can be used for assessing the difference that causes outer light face glossiness difference and the mist that turns white because of thickness difference.
A die cavity has decorative thread, and this design is strip projection in dynamic model side, is strip pit in cover half side, and projection and pit are positioned at same position on mould, the impact of overturning in mould for assessment of melt and flowing on product appearance.
A die cavity has the rule design of three places, on the vertical melt plastic cement flow direction of corner, there is place rule design, the direction that is parallel to die cavity edges in both sides, turning respectively has place rule design, when closing the 5th cast gate and opening in front four cast gates any one cast gate, the rule of nearly gate end is for evaluating perpendicular to the shrinkage factor on melten gel flow direction, corner's rule is used for evaluating melten gel flow divert place shrinkage factor, and the rule of gate end far away can be used for evaluating the shrinkage factor being parallel on melten gel flow direction.
It is 0.5mm that Type B chamber dynamic model side has four degree of depth, the blind hole that radius is 5mm, and each blind hole has different transition section lengths.This design can be used for the albefaction of assessment material appearance and the sensitiveness of gloss uneven defect to blind hole transition section length.Type B chamber dynamic model side also has four kinds of screw columns, and can change screw hole diameter by the ejector pin of changing different thicknesses.Can be used for assessment material shrink mark, the glossiness difference sensitiveness with screw column design and change in size.Type B chamber dynamic model side has the different muscle position of separate thickness everywhere, muscle position is opened in and is installed on the inserting of dynamic model side, and can insert and change muscle position thickness by replacing, this design can be used for the sensitiveness of turning white to different muscle position thickness in assessment material shrink mark or muscle position.Type B chamber dynamic model side has place's through hole toroidal design, and annulus connects the thin-walled muscle position design of a parallel die cavity edges.When cast gate is opened arbitrarily in current four cast gates, after annulus, all can become plastic rubber welding region and form weld mark, in order to assess the appearance effect of weld mark under high-speed filling.
Evaluation mould of the present invention is applicable to the ocular estimate of following high luminescent material: high-light ABS, HIPS, PMMA, AS, PC, PPE etc. and the high luminescent material by their one or more blending and modifying gained.
Mold for evaluating appearance of plastic of the present invention, its advantage is as follows:
1. can be applied to preferably assessment product surface smoothness and glossiness through the mold cavity of polishing;
2. near many different cast gates defect that commute appears at cast gate is simultaneously assessed;
3. many scales, blind hole and through hole annulus can be in order to increase material glossiness to its susceptibility, thereby strengthen the measurement of its lustrous surface and shrinkage.
Brief description of the drawings
Fig. 1 is the schematic perspective view of described mould;
Fig. 2 is that cast gate is opened in the schematic perspective view on inserting;
Fig. 3 is the structural representation of screw column;
Fig. 4 is the structural representation of die cavity gradient thickness design.
Main element explanation
| 1: | A die cavity | 2: | Type B chamber |
| 3: | Sprue | 4: | Runner |
| 5: | Cow glue powder | 6: | Sub marine gate |
| 7: | Thin side gate | 8: | Thick side gate |
| 9: | Rule | 10: | Muscle position |
| 11: | Through hole annulus | 12: | Thin-walled muscle |
| 13: | Decorative thread | 14: | Blind hole |
| 15: | Screw column | 16: | Flanging |
| 17: | Insert | 18: | Ejector pin |
| 19: | Outer side edges | 20: | Inner side edge |
Detailed description of the invention
Provide embodiment below to be described in more detail the present invention, but the present invention is not limited to these embodiment, some nonessential change and adjustment that one of skill in the art makes according to technique scheme, still belong to protection scope of the present invention.
Fig. 1 is the schematic perspective view of mould, mold for evaluating appearance of plastic die cavity is at least made up of dynamic model and cover half closure, in close die, have two die cavitys of A and B, cavity surface is through polishing, the interior mold temperature control medium flow passage that offers from die face a distance of dynamic model and cover half.
Described die cavity connects cast gate, runner 4, sprue 3 successively, in die cavity, there is the multiple structure for assessment of material appearance performance, comprise different gate forms, size and position, the design of gradual change wall thickness, the design of different directions rule, there is the blind hole design of different transition section lengths, different screw column designs, the muscle position design of different-thickness.
Wherein, each die cavity has 5 cast gates, and front 4 mutual close together of cast gate are positioned at die cavity the same area, and the 5th is opened in from front 4 cast gates on the die cavity away from, and cast gate is connected with sprue by runner, offers flow control valve on runner.Be respectively from left to right that thick side gate 5, thin side gate 6, sub marine gate 7,8, the 5 cast gates of horn gate adopt thick side gate design, front 4 cast gates are opened on the gating insert being installed in dynamic model, and the 5th cast gate is directly opened on dynamic model.
A and B two die cavity cross sections all have gradient thickness design and flanging designs, thickness by 3mm gradual change to 2.5mm; A die cavity has decorative thread design, and this is designed to strip groove, is strip projection in dynamic model side, is strip pit in cover half side, and projection and pit are positioned at same position on mould; A die cavity has 3 rule designs, rule direction and position; Type B chamber dynamic model side has 4 places to have the blind hole design of different transition section lengths, and blind hole depth h is 0.5mm, diameter 10mm, and from left to right transition section length L is respectively 30Xh, 10Xh, 3Xh, 0Xh.
As shown in Figure 3, Type B chamber dynamic model side has 4 places screw columns designs, from left to right screw column design be respectively root without any processing, root adds glue, root subtracts glue (being commonly called as volcanic crater design), screw column reinforcement and root subtract glue; And can change screw hole diameter by the ejector pin of changing different thicknesses.
Type B chamber dynamic model side has the different muscle position design of the 4 separate wall thickness in place, and muscle position is by 4 realizations of independently inserting.From upper to little, muscle position thickness is respectively 48% product body thickness, 60% product body thickness, 72% product body thickness, 80% product body thickness; Type B chamber dynamic model side has place's through hole toroidal design, connects thereafter a thin-walled strip muscle position.Annulus thickness is 2.5mm, and muscle position thickness is 1mm, annulus and the high 10mm in muscle position.
Insert as shown in Figure 2, described cast gate is opened in to be inserted above, insert and be arranged in moving die insert installation position, thereby and the plastic cement that is received from cast gate ejection its performance is assessed.
Fig. 4 is the structural representation of die cavity gradient thickness design, the thickness of its outer side edges 19 is less than the thickness of inner side edge 20, and thickness is by 3mm gradual change to 2.5mm, and its purposes is, polymer can flow easily in die cavity, is easily full of whole die cavity and is beneficial to evaluate its correlated performance.
Claims (11)
1. a mold for evaluating appearance of plastic, comprise dynamic model and cover half, it is characterized in that, moving, the closed cavity surface forming of cover half is the smooth interface after the polishing of the above diamond cream of 6000#, moving, after cover half closure, there are (2) two die cavities in A die cavity (1) and Type B chamber, two die cavities of A and B have multiple multi-form cast gates, its gate form comprises horn gate (5), sub marine gate (6), thin side gate (7), thick side gate (8), on described cast gate is opened in and inserts, insert and be arranged in moving die insert installation position, on each die cavity, being also provided with the 5th cast gate is opened on moving platen, each cast gate is connected with sprue (3) by runner (4), runner (4) is provided with flow control valve and controls melt plastic cement by the flow velocity of each cast gate by controlling the switching of each cast gate.
2. mold for evaluating appearance of plastic according to claim 1, is characterized in that, moving, cover half all offers mold temperature control medium flow passage, and the heat transfer medium control mould temperature of carrying by external die heater.
3. mold for evaluating appearance of plastic according to claim 1, is characterized in that, A and B two die cavities are all provided with the turning design of 90 °, a place.
4. mold for evaluating appearance of plastic according to claim 1, is characterized in that, A and B two die cavities all have 90 ° of flanging designs.
5. mold for evaluating appearance of plastic according to claim 1, is characterized in that, A and B two die cavities all have gradient thickness design, thickness by the even gradual change of 3mm to 2.5mm.
6. mold for evaluating appearance of plastic according to claim 1, it is characterized in that, the flanging place, side of A die cavity is provided with a decorative thread (13), and this decorative thread (13) is strip projection in dynamic model side, be strip pit in cover half side, projection and pit are positioned at same position on mould.
7. mold for evaluating appearance of plastic according to claim 1, it is characterized in that, A die cavity (1) has 3 100mm of place rules (9), its position is respectively, on the vertical melt plastic cement flow direction of corner, have place rule design, the direction that is parallel to die cavity edges in both sides, turning respectively has place rule design.
8. mold for evaluating appearance of plastic according to claim 1, it is characterized in that, it is 0.5mm that Type B chamber dynamic model side is provided with four degree of depth h, radius is the blind hole (14) of 5mm, the transition section length of each blind hole (14) is different, and transition section length L is respectively 30 × h, 10 × h, 3 × h, 0 × h.
9. mold for evaluating appearance of plastic according to claim 1, it is characterized in that, Type B chamber dynamic model side has four kinds of screw columns (15), described four kinds of screw columns (15) be respectively root without any processing, root adds glue, root subtracts glue, screw column reinforcement and root and subtracts glue, screw hole is realized by ejector pin is set in dynamic model side, can change screw hole diameter by the ejector pin of changing different thicknesses.
10. mold for evaluating appearance of plastic according to claim 1, it is characterized in that, Type B chamber dynamic model side has the different muscle position of separate and thickness everywhere, and realize by four replaceable mold inserts are installed in dynamic model side muscle position, can change muscle position thickness by changing mold insert.
11. mold for evaluating appearance of plastics according to claim 1, Type B chamber dynamic model side has place's through hole annulus, and annulus one termination is parallel to the thin-walled muscle position of die cavity edges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110400720.3A CN102416690B (en) | 2011-12-06 | 2011-12-06 | Mold for evaluating appearance of plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110400720.3A CN102416690B (en) | 2011-12-06 | 2011-12-06 | Mold for evaluating appearance of plastic |
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| CN102416690A CN102416690A (en) | 2012-04-18 |
| CN102416690B true CN102416690B (en) | 2014-09-24 |
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| CN201110400720.3A Active CN102416690B (en) | 2011-12-06 | 2011-12-06 | Mold for evaluating appearance of plastic |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103144253A (en) * | 2013-03-26 | 2013-06-12 | 苏州工业园区协利塑胶有限公司 | Thin-walled workpiece mould |
| CN110815731B (en) * | 2019-11-04 | 2022-01-25 | 宁波帅特龙集团有限公司 | Spectacle case production mold and production process |
| CN117832783B (en) * | 2024-03-06 | 2024-05-28 | 厦门海辰储能科技股份有限公司 | Lower plastic, end cover assembly, energy storage device and electric equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1054390A (en) * | 1990-03-01 | 1991-09-11 | 吉林工业大学 | Technology for making plastics forming dies |
| CA2489393A1 (en) * | 2002-06-14 | 2003-12-24 | Cornerstone Technology Inc. | Process and system for designing molds and dies |
| CN100498283C (en) * | 2005-03-23 | 2009-06-10 | 中南大学 | Spiral flow fluidity testing mould |
| KR20090073797A (en) * | 2007-12-31 | 2009-07-03 | 한국단자공업 주식회사 | Test mold assembly |
| CN201275849Y (en) * | 2008-08-29 | 2009-07-22 | 上海晨兴电子科技有限公司 | Light conducting board mold with adjusting device |
| CZ21104U1 (en) * | 2010-05-24 | 2010-07-12 | Technická univerzita v Liberci, Katedra strojírenské technologie, | Injection mold for producing test samples for testing plastic screws enabling variability of test sample size |
| CN202399468U (en) * | 2011-12-06 | 2012-08-29 | 金发科技股份有限公司 | Plastic appearance evaluation mould |
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| CN102416690A (en) | 2012-04-18 |
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