Decorative element and the manufacture method thereof with integral type gudgeonTechnical field
The present invention relates to a kind of plastic material decorative element and manufacture method thereof of integral structure mode of inner space, described decorative element comprises the hollow gudgeon of the visual surface that protrudes from described decorative element, in order to support pivotable accessory.
Background technology
For for the swingable accessory of decorative element upper support (such as storage cabinet, cover plate etc.), require decorative element must have certain impregnability on the one hand, so that under common load condition, gudgeon can not fracture or bending.The visual surface of decorative element can not suffer the infringement of visual aspects on the other hand, that is to say, and when manufacturing this visual surface, the high visual quality that must be consistent.
Meanwhile, according to manufacturing in due form the applied the injection forming process manufacture of decorative element, to have the region of different wall (and part geometry is perhaps very complicated) very difficult.
Up to now, manufacture the decorative element that there is no gudgeon for this reason and first, subsequently this decorative element is for example mounted on it by welding as separate part.
Yet due to quantity and the expense of procedure of processing, this way is undesirable, especially requiring technique car manufacturing field extremely efficiently.
DE 42 04 627 C2 disclose a kind of bearing axle for vehicle sun visor, and it is constructed to have the tubular hollow body of at least one bend pipe and is made by integrated plastic injection molding body.At this this tubular hollow body, there is continual tube wall.The method of manufacturing this bearing axle comprises the following steps:
A) plastic melt of scheduled volume is expelled in the cavity of closed mould;
B) will in this fused mass, apply gas with pressure like this, so that this fused mass is evenly distributed on the surface of mould cavity in the situation that forming bearing axle cavity;
C), after through a hardening time, first open injection moulding mould, and hollow moulding thing is from mold releasability;
D) end of amputation sealing from moulding thing.
Yet so only can manufacture gudgeon self, this gudgeon has continuous, basic wall thickness uniformly.
EP 0,289 230 A2 discloses a kind of method of the drip molding for the manufacture of being made of plastics, wherein, molten thermoplastic plastics are applied in mould cavity, high pressure gas are applied in these plastics, and during gas keeps bearing pressure, make the cooling and sclerosis in cavity of plastics forming part, wherein, cavity is designed to manufacture has uneven distribution, the drip molding in the region of heavy wall, these regions are connected with at least one input port, this input port is for delivery of the gas that bears pressure, now cavity fills up plastics completely, and after filling and plastics cooling period and have to shrink within drip molding and be inclined to, by the gas exerts that bears pressure to the plastics that are arranged within cavity, wherein, gas only flows within the formation plastics of thick wall area and the direct neighbor district of drip molding, wherein, gas enters thick wall area, and wherein, make up the contraction of plastics, within inflation area, in the cooling stage of crumpling process, make gas bear pressure, until drip molding can keep the shape of being stipulated by cavity surface automatically.
DE 198 27 706 C2 disclose a kind of for soft lining material being fixed on to the method on hollow duroplasts hard plastic materials and parts part, injection molded with palintrope, and it is as follows that the method comprising the steps of:
Lining material is put into mould cavity between the half module of injection mould;
Seal by halves half module;
In the situation that the relative lining material of mould not exclusively seals, thermoplastic base resin is injected to mould cavity;
In the situation that the resin injecting is distributed on lining material in mould cavity, further seal half module; And
In resin distribution in the situation that in recurved part and form hollow duroplasts part, the recurved part of the Plastic Parts that the gas inject that bears pressure is shaped.
Summary of the invention
On the other hand, task of the present invention is by means of the injection forming process, to provide a kind of decorative element with integral type gudgeon according to integral structure mode, described decorative element can be manufactured at an easy rate, lower in the material consumption of this gudgeon, has higher impregnability simultaneously.
Task of the present invention solves the decorative element providing by claim 1.
Because decorative element is become by plastic injection-moulded system according to integral structure mode, so it can be manufactured at an easy rate.Owing to thering is annular bearing in its transitional region between described gudgeon and remaining decorative element, wherein, described bearing is arranged on the sightless back side of described decorative element, and described gudgeon is hollow, thereby obtain on the one hand higher impregnability, saved material consumption simultaneously.And provide visual surface according to desired quality.Described bearing can so be implemented according to appropriate ways, and it bears the power that acts on gudgeon, and by suitable structure, this power is passed to decorative element in large area.
Said bearing can have than the larger wall thickness of gudgeon and/or diameter.In addition described bearing is tapered, and this, with regard to its wall thickness, is not only also like this with regard to its diameter.
Described cavity is preferably substantially cylindrical.Thereby realize can be gentlier, firmer and material consumption less manufactures described gudgeon.
According to advantageous manner, the interior recess of structure annular in described standoff region.The recess that should fall makes the bearing diameter the transitional region from gudgeon to bearing become larger, and wherein, described bearing dwindles again along with leaving transitional region further.Can realize harder bearing whereby.
It is spherical that described bearing is preferably.Spherical crown has very high rigidity in essence, thereby domed bearing clamps gudgeon very hardy.
Further advantageously, the cavity of gudgeon has opening towards the back side of described decorative element.So, can utilize hairclipper or by from rear injecting gas (observing from decorative element direction) boring form this gudgeon, and therefore this gudgeon (is observed from inner space) and can be sealed and realize above.
In addition can independent supporting rib be set in neighboring on bearing side, to supporting power can be passed to decorative element better.These supporting ribs can at random be shaped, and important part is, on the decorative element back side, supporting power is passed to decorative element in large area.
As the method for manufacturing corresponding decorative element, can use injection molded, especially so-called internal pressure injection molded.Internal pressure injection molded is a kind of the injection forming process of special manufacture hollow workpiece, and this technique is proved and is highly suitable for the hollow gudgeon of making in site.
Be when the mold filling stage approximately finishes with the difference of common injection molded or particular job step after mould being completed to predetermined being partially filled.In the special algorithm of technique, liquid weighting material (being mainly water or unreactable gas) is injected to the mould being partially filled, so that weighting material serves as inner drip molding (die cavity).By from middle extrusion molten thing, strengthened cavity on the one hand, on the other hand fused mass be pressed onto on outer mould or be pressed in outer mould, thereby generating the hollow gudgeon that comprises bearing and opening.
Have realized that, this method that is particularly useful for the clavate parts that wall thickness is very large also can be applied to have integral type gudgeon and the higher decorative element of visual surface quality.
Thereby can in an operation, there will not be depression points to make the different product (this product had been previously two parts) of wall thickness in hollow gudgeon region (Einfallstellen).Therefore have realized that the drawbacks common of the method (occurring hole at injection point), at respective design nozzle and have small diameter in the situation that, can not affect the impregnability of gudgeon.
Because this shortcoming makes up by bearing.This is especially when gudgeon cavity opens wide towards the decorative element back side and bearing is set to circlewise around opening, and this is because material bending or flex point etc. are avoided effectively.
In addition expectation, cavity is preferably substantially cylindrical, wherein, the interior recess of looping in open area.This has improved impregnability in saving material situation.
During manufacture, can apply a kind of liquid by means of nozzle, the opening of this nozzle is arranged on the tip of the pipe that taper extends, and wherein, conical surface angle is so selected, so that fall recess, between hardening period, by the liquid flowing into, forms.
In injection moulding mould, be preferably gudgeon independent hairclipper is set.Following situation is favourable, and the stripping direction of decorative element is different from the stripping direction of gudgeon.First the hairclipper of gudgeon returns, the just demoulding of decorative element afterwards.Thereby can independently make firm gudgeon with the stripping direction of mould.
Accompanying drawing explanation
According to the following explanation of embodiment, obtain other details of the present invention, feature and advantage by reference to the accompanying drawings.In accompanying drawing:
Fig. 1 is the schematic three-dimensional view of visual surface with the decorative element of integral type gudgeon;
Fig. 2 is the schematic three-dimensional view at the back side of the decorative element of Fig. 1; And
Fig. 3 schematically shows the method with the decorative element of integral type gudgeon constructed in accordance with part sectional view.
The specific embodiment
The whole decorative element with 1 sign shown in accompanying drawing.Decorative element 1 comprises visual surface 2 and the back side 3, and under confined state, visual surface 2 is set to appreciiable in other words towards inner space visibly, and the back side 3 corresponding be sightless.
Decorative element 1 is become by plastic injection-moulded system, and according to integral structure mode comprise protrude from this decorative element visual surface 2, about cylindrical hollow gudgeon 4, in order to support pivotable accessory.
In transitional region between hollow gudgeon 4 and remaining decorative element 1, decorative element also comprises the spherical bearing 5 of annular, and wherein bearing 5 is arranged on the sightless back side 3 of decorative element 1.
The cavity 7 of gudgeon 4 opens wide towards the back side 3 of decorative element 1, and bearing 5 arranges circlewise around opening 6.
Cavity 7 is substantially cylindrical, wherein, and the interior recess 8 of looping in the region of opening 6.
In order to manufacture decorative element 1, the injection moulding mould 9 shown in Fig. 3 section-drawing can be applied in gas-assisted injection molding forming technology.
Injection moulding mould 9 also comprises the device 10 for supplying gas targetedly except comprising common assembly.This device 10 is included in the nozzle 11 on the tip of the pipe 12 that taper extends.In these conical surface 13 angles, so select, so that not only cavity 7 but also the recess 8 that falls are all to form by the gas flowing between hardening period.
The step of decorative element 1 that manufacture has gudgeon 4, cavity 7 and spherical bearing 5 is as follows:
A) plastic melt of scheduled volume is expelled in the cavity of injection moulding mould 9,
B) gas is applied in fused mass via nozzle 11 with this pressure, so that fused mass is evenly distributed on the surface of mould cavity in the situation that forming gudgeon cavity 7 and torus shaped bearing 5 and fall recess 8,
C), after through one section of hardening time, the hairclipper 14 of mobile gudgeon, opens injection moulding mould 9 afterwards first backward, and obtains the decorative element injection moulding from this mold releasability.