CN1217777C - Mould for resin formation - Google Patents
Mould for resin formation Download PDFInfo
- Publication number
- CN1217777C CN1217777C CN99121534.6A CN99121534A CN1217777C CN 1217777 C CN1217777 C CN 1217777C CN 99121534 A CN99121534 A CN 99121534A CN 1217777 C CN1217777 C CN 1217777C
- Authority
- CN
- China
- Prior art keywords
- recess
- molded body
- wall thickness
- mentioned
- resin molded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000011347 resin Substances 0.000 title claims abstract description 87
- 229920005989 resin Polymers 0.000 title claims abstract description 87
- 230000015572 biosynthetic process Effects 0.000 title claims description 7
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 230000033228 biological regulation Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- 238000001746 injection moulding Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 230000005764 inhibitory process Effects 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000035922 thirst Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2628—Moulds with mould parts forming holes in or through the moulded article, e.g. for bearing cages
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Pens And Brushes (AREA)
- Toys (AREA)
Abstract
A resin molded body suppressing occurrence of welds on the downstream side of openings. While openings 2 are provided in a resin molded body 1, a first recess 3 is provided in the rear of the resin molded body 1 and on the downstream side of the openings 2 in the direction C of flow of injected molten resin, and a pattern part 5 is provided on the downstream side of the recess. A plurality of second recesses 4 constituting the pattern part 5 are formed respectively in the shape of longitudinal grooves in directions intersecting perpendicularly the direction C of flow, and a thin wall part is formed in the resin molded body 1 on the downstream side of the openings 2 by the first recess 3 and the second recesses 4.
Description
The present invention relates to the resin molded body that forms by injection molding forming, that is to say, the resin molded body that stria produces is relevant with reducing.
Japanese kokai publication hei 3-43220 communique discloses a kind of when the multi-point sprue injection molding forming, by the flange of wall ratio peripheral wall thickness is set near the cast gate of metal pattern, reduces near the scheme of the stria (weld) that is produced the cast gate.
Fig. 2 shows an example that does not adopt stria to suppress the resin molded body of means, and the integral body of two-wheeled exterior member constitutes lamellar by injection molding forming by uniform wall thickness.Wherein, a among the figure shows its surperficial side, and b shows its inside one side.The represented cast gate G of gimmick with exaggeration in figure b approximately is arranged on the position that the most difficult outward appearance of the inboard central authorities of formed products arrives, this resin molded body 1, have several peristomes 2 in abundant position, form from this opening 2 along injecting the stria 6 of the mobile direction of molten resins towards the downstream away from cast gate G.This stria 6 clearly and impairs aesthetic appearance, thereby, can not use with this state, must cover with paint, lacquer, colour wash, etc.Particularly,, thereby must cover with paint, lacquer, colour wash, etc. owing to stria significantly and is easily seen in the vehicle of paying attention to outward appearance pigmentary resin formed body technical scheme.
Resembling the molten resin that injects in the metal pattern shunts because of certain reason, collaborate again afterwards, just produced stria thus, this stria is the pattern at the streamline shape that collaborates partly to be produced, under the situation of above-mentioned multi-point sprue formula injection molding forming, near cast gate, be easy to produce.
And the position that stria takes place is not limited near the above-mentioned cast gate, and under the situation of the peristome that is provided with above-mentioned Fig. 2, its metal pattern forming section is to make to inject the reason that shunting takes place molten resin flow, thereby also stria can take place in the downstream of peristome.Also have, descending away from the temperature of the resin of cast gate, flowing velocity can be slack-off, and this also can make the generation of stria more remarkable.In addition, this shunting be not limited to peristome, also can take place at lug bosses such as rib or boss.
Therefore, above-mentioned flange is set for the generation that prevents stria at distributary division away from above-mentioned gate location, very ineffective.People thirst for developing the means of any effective inhibition stria.
The present invention is exactly in view of the above problems and proposes, and its objective is the resin molded body of the generation that a kind of stria that can suppress the peristome downstream effectively is provided.
In order to solve above-mentioned problem, the resin molded body of first technical scheme of the present invention is the resin molded body that the distributary division that becomes the injection of stria occurrence cause molten resin is arranged in the part that separates with resin injection portion, it is characterized in that, in position, and be provided with the wall thickness change portion of wall thickness that make along the flow direction variation of this injections molten resin in the flow downstream of direction of the molten resin that injects from this distributary division near this distributary division.At this moment, distributary division can be the peristome of resin molded body, and in addition, wall thickness change portion inside forms.
Second technical scheme of the present invention is, a part of wall thickness that laminal formed body is done by minimizing by the wall thickness change portion of above-mentioned first technical scheme forms, and has first recess that is positioned near the recess of distributary division position simultaneously.Further, the wall thickness of this first recess be normal thickness roughly half.
The 3rd technical scheme of the present invention is, the wall thickness change portion of above-mentioned first technical scheme has first recess of second technical scheme and injecting the decorative pattern portion that the mobile direction downstream of molten resin forms after this first recess, and this decorative pattern portion is to the part of normal thickness part along with the transition of wall thickness change from above-mentioned first recess.At this moment, between above-mentioned first recess and decorative pattern portion, be provided with the interval of regulation.
The 4th technical scheme of the present invention is that the decorative pattern portion of the 3rd technical scheme is the stage portion or the rake that form in the mobile direction downstream of injection molten resin after first recess.
The 5th technical scheme of the present invention is, wave shape is made by the decorative pattern portion of above-mentioned the 3rd technical scheme, and its jog extends along the direction perpendicular to the flow direction that injects molten resin simultaneously.
The 6th technical scheme of the present invention is that the decorative pattern portion of above-mentioned the 3rd technical scheme has erose groove.
According to first technical scheme of the present invention, even there is the distributary division that separates with resin injection portion, because downstream in the mobile direction of the molten resin that injects from this distributary division, be provided with and make the wall thickness change portion of wall thickness, thereby the injection molten resin of shunting collaborates in this wall thickness change portion along the flow direction variation of this injection molten resin, at this moment, cause irregular variation on the flow direction that injects molten resin, the result is that the stria that will produce cuts off, and makes stria not obvious in appearance.In addition, the present invention not only is meant the inhibition of stria and has reduced its quantity, but also comprising the unconspicuous effect of stria that makes.
At this moment, if with the peristome of distributary division as resin molded body, like this, even form the generation that peristome also can suppress stria.In addition, wall thickness change portion inside forms, and thus, even wall thickness change portion is set, also can not damage aesthetic appearance.
According to a second technical aspect of the present invention, because wall thickness change portion is forming first recess that is positioned near distributary division, thereby, by injecting the interflow of molten resin on this first recess, can suppress the generation of stria.And this first recess forms by a part of wall thickness that reduces resin molded body, therefore can easily form and do laminal resin molded body.Moreover, if the wall thickness of first recess approximately is normal thickness half, then can more effectively suppress the generation of stria.
According to a third technical aspect of the present invention, wall thickness change portion is made of first recess and decorative pattern portion, this decorative pattern portion is to the part of normal thickness part along with the transition of wall thickness change from above-mentioned first recess, therefore, from first recess between the normal thickness part, can further make the variation brokenly of flowing of injecting molten resin by means of decorative pattern portion, thereby suppress stria.This occasion if be provided with the interval of regulation between first recess and decorative pattern portion, then can more effectively suppress the generation of stria.
According to a fourth technical aspect of the present invention, because above-mentioned decorative pattern portion is stage portion or rake, therefore, wall thickness restores to normal thickness part gradually from first recess, can make simultaneously to inject flowing of molten resin and change brokenly.
According to the 5th technical scheme of the present invention, because wave shape is made by decorative pattern portion, concavo-convex flow direction towards the injection molten resin forms repeatedly, and, this jog extends along the direction that is approximately perpendicular to the flow direction that injects molten resin, thereby, can make that stria attenuates, sectionalization, as a result, very not obvious in appearance.
According to the 6th technical scheme of the present invention, because decorative pattern portion forms erose groove, thereby, the further randomization that flows of the injection molten resin in the decorative pattern portion.
Fig. 1 is surface one side of resin molded body of present embodiment and the schematic diagram of the inside one side.
Fig. 2 is the schematic diagram corresponding to Fig. 1 of example in the past.
Fig. 3 is the cutaway view of the 3-3 among Fig. 2.
Fig. 4 is the schematic diagram that stria suppresses the variation of means.
Fig. 5 is the schematic diagram that stria suppresses the variation of means.
Fig. 6 is the schematic diagram that stria suppresses the variation of means.
Fig. 7 is the schematic diagram that stria suppresses the variation of means.
Fig. 8 is the schematic diagram that stria suppresses the variation of means.
Fig. 9 is emulation surface one side of sample and the schematic diagram of the inside one side.
Figure 10 is the schematic diagram of expression comparative example velocity vector.
Figure 11 is the cutaway view of the 11-11 of Figure 10.
Figure 12 is the schematic diagram of the corresponding velocity vector of relevant with sample and Figure 10.
Figure 13 is the schematic diagram corresponding with Figure 11.
One embodiment hereinafter is described with reference to the accompanying drawings.Fig. 1 shows the two-wheeled resin molded body that constitutes with exterior member of conduct of present embodiment, and wherein a shows its surperficial side, and b shows its inside one side.Fig. 3 is the cutaway view in the 3-3 cross section of Fig. 1, and Fig. 4 to Fig. 6 shows the variation that stria suppresses means respectively.In addition, the part identical with Fig. 2 is with identical symbolic representation.
As Fig. 1 and shown in Figure 3, this resin molded body 1 forms lamellar by injection molding forming, have the structure shown in the b with Fig. 2 same fully away from several peristomes 2 of cast gate G position, in its inboard, form nicking shape first recess 3 in the downstream part of injecting the peristome 2 on the mobile direction C of molten resin, and form the decorative pattern portion 5 that forms by several second recesses 4 in its rear position.
The part of formation first recess 3 in the wall thickness of resin molded body 1 has thinner wall section A, and the formation with second recess, 4 parts first recess, 3 adjacency in several second recesses 4 of formation decorative pattern portion 5 partly have thinner wall section B.
Thinner wall section A, B have essentially identical wall thickness t, and the normal thickness T with respect to as the average wall thickness of other parts is approximately its degree of 1/2.The variation of the wall thickness of this degree can make the forming property of resin molded body 1 and the inhibition of stria reach balance effectively.But also can be bigger than this, also can be littler than this.
As shown in Figure 3, the width W of the flow direction of first recess 3 is with respect to the interval D of the peristome 2 and first recess 3, and is proper more than same degree, is approximately 2 times in the present embodiment.By the way, in the present embodiment, D is the degree of 5～10mm, and W is more than the 10mm.But these numerical value can carry out suitable change according to employed resin or various molding condition.In addition, the not special restriction of length of the decorative pattern portion 5 of the width of second recess 4 of decorative pattern portion 5 and the mobile direction of injection molten resin.
The effect of present embodiment hereinafter is described.As shown in Figure 3, be injected into injection molten resin in the metal pattern by injection, flow, in the shaped portion shunting of the metal pattern that is equivalent to peristome 2, then, collaborate afterwards in the downstream along the arrow C direction from cast gate.
But owing to the existence that first recess 3 is arranged in interflow portion, here, the mobile of interflow portion can produce bigger disorder, thereby stria is difficult to take place.And in the downstream of first recess 3, owing to the existence by the decorative pattern portion 5 that is made up of several second recesses 4, it is also very random therefore to flow in this position, and its result can be suppressed at the generation of the downstream stria of peristome 2.Like this, can form the good resin molded body with peristome 21 of outward appearance.
Further, because the direction of second recess 4 of decorative pattern portion 5 is generally vertical with the flow direction C that injects molten resin, therefore this injection resin flow is easy to get muddled, and can more effectively suppress the generation of stria.
In addition; the wall thickness of thinner wall section A and thinner wall section B is respectively t; and approximately be roughly 1/2 of normal thickness T; first recess 3 forms in the mode of a part of wall thickness of reducing resin molded body 1; thus; can easily form by the lamellar resin molded body that constitutes 1, suppress the generation of stria 6 effectively.
Hereinafter, according to Computer Simulation the phenomenon that adopts this concaveconvex structure can suppress stria is described in further detail.Fig. 9 shows the sample 20 of the employed resin molded body of this emulation, and a shows its surperficial side structure, and b shows the structure of its inside one side.
Sample 20 is made the tabular that all is made of same wall thickness, it injects molten resin and flows to from length direction one is distolateral that another is distolateral, be provided with the peristome 2 of perforation table inboard at pars intermedia, and inside a side is provided with first recess 3 and second recess, 4, the first recesses 3 and second recess, 4 parts and is made of thinner wall section A and thinner wall section B.
Figure 10 shows with this sample 20 and compares, except only lacking first recess 3 and second recess, 4 differences, the velocity vector of the injection molten resin of comparative example when injection molding forming that the other technologies scheme is identical, Figure 11 shows the velocity vector in the 11-11 cross section of its peristome 2 downstream central portions.
What the direction of arrow was represented among the figure is the direction of injecting molten resin, and the length of arrow is represented flow velocity.As can be seen from this figure, in the downstream of peristome 2, the injection molten resin around peristome 2 from side opposite each other interflow becomes basic laminar flow uniformly, methodically flows through central portion, and along with decrease of temperature, stria line extending toward the flow direction can occur.
Another technical scheme, Figure 12 and Figure 13 are corresponding with Figure 10 and Figure 11 respectively schematic diagrames of the shaping emulation of sample 20, as can be seen, at the mobile of interflow portion of the central portion in peristome 2 downstreams big disorder can take place from these figure.
Can clearly be seen that from Figure 13 because the existence of thinner wall section A, thinner wall section B, along with the variation flow rate of wall thickness can change, this changes can produce longitudinal turbulence (eddy current in the plane parallel with wall thickness).
Therefore, even in speed and the lower part of temperature away from cast gate, it is random injecting the mobile of molten resin, stir fully injecting molten resin, so, can suppress the generation of stria.
That is to say that all make a kind of decorative pattern portion 5, each recess is identical, but near the recesses the peristome 2 wherein are first recess 3, other recesses are second recess 4.In addition, the length direction of the amplitude of wave form direction of decorative pattern portion 5 and jog is vertical with the flow direction C that injects molten resin respectively.
The example of Fig. 5 is, decorative pattern portion 5 constitutes by making the second step-like recess 4, and second recess 4 towards the formation gradually of the downstream of the flow direction that injects molten resin with shoaling.In this case, the width of the bottom of second recess 4 can be constant, on the contrary, also can be irregular.
Further, also can not make step-likely, and make continuous inclined plane shape.Like this, wall thickness restores to normal thickness part gradually from first recess 3, injects the mobile randomization of molten resin simultaneously.In addition, the wall thickness of thinner wall section A and thinner wall section B is t, and is roughly 1/2 of normal thickness T.
In the example of Fig. 6, show decorative pattern portion 5 by clathrate protuberance and the example that forms around the recess of the bulk of this protuberance, wherein, be first recess 3 near the recess of peristome 2, other recesses are second recess 4 (showing the part of first recess 3 and second recess 4 in the drawings respectively).Each wall thickness of these recesses about equally, that is, thinner wall section A and thinner wall section B have wall thickness t about equally, and are roughly 1/2 of normal thickness T.
In addition, first recess 3 of such bulk and second recess 4 also can be made different shape, for example triangle or polygon etc.And convex-concave portion can also reverse, and recess is continuous, and protuberance is made bulk.Moreover decorative pattern portion 5 integral body also can be formed by the groove of cancellate groove or striated.Concaveconvex shape by changing such bulk or distribution density etc. can make the mobile randomization of injecting molten resin.
Fig. 7 is similar with the example of Fig. 4, but what illustrate is by the shape of each second recess 4 and in abutting connection with the example that is irregularly formed at interval.Also can make the mobile randomization of injecting molten resin according to this structure.
Fig. 8 is another example that forms irregular decorative pattern portion 5.Its second recess 4 is made a kind of leather bag shape, like this, also can make the randomization significantly that flows of injecting molten resin.
The present invention can also have all forms of implementation except that above-mentioned various embodiment, for example distributary division also can be lug bosses such as rib or boss.
Claims (10)
1, a kind of resin molded body, has the peristome that becomes the injection of stria occurrence cause molten resin with resin injection portion part separately, it is characterized in that, near above-mentioned peristome and in the downstream of the direction that flows from the injection molten resin of this peristome, be provided with the wall thickness change portion of wall thickness that make along the flow direction variation of this injections molten resin.
2, the resin molded body of putting down in writing according to claim 1 is characterized in that, above-mentioned wall thickness change portion inside forms.
3, the resin molded body of putting down in writing according to claim 1 is characterized in that, a part of wall thickness that laminal formed body is done by minimizing by above-mentioned wall thickness change portion forms, and has first recess that is positioned near the recess of distributary division position simultaneously.
4, the resin molded body of putting down in writing according to claim 3 is characterized in that, the wall thickness of above-mentioned first recess is half of normal thickness.
5, the resin molded body of putting down in writing according to claim 3, it is characterized in that, above-mentioned wall thickness change portion has first recess that above-mentioned wall thickness reduces and injecting the flow decorative pattern portion of direction downstream formation of molten resin continue this first recess after, and this decorative pattern portion is to the part of normal thickness part along with the transition of wall thickness change from above-mentioned first recess.
6, the resin molded body of putting down in writing according to claim 5 is characterized in that, is provided with the interval of regulation between above-mentioned first recess and decorative pattern portion.
7, the resin molded body of putting down in writing according to claim 5 is characterized in that, above-mentioned decorative pattern portion is injecting the flow stage portion of direction downstream formation of molten resin continue first recess after continuously.
8, the resin molded body of putting down in writing according to claim 5 is characterized in that, the molten resin rake that the direction downstream forms that flows is injecting in above-mentioned decorative pattern portion after first recess.
9, the resin molded body of putting down in writing according to claim 5 is characterized in that, wave shape is made by above-mentioned decorative pattern portion, and its jog extends along the direction perpendicular to the flow direction that injects molten resin simultaneously.
10, the resin molded body of putting down in writing according to claim 5 is characterized in that, above-mentioned decorative pattern portion has erose groove.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10309449A JP2000117785A (en) | 1998-10-14 | 1998-10-14 | Resin molded body |
| JP309449/1998 | 1998-10-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1250715A CN1250715A (en) | 2000-04-19 |
| CN1217777C true CN1217777C (en) | 2005-09-07 |
Family
ID=17993141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99121534.6A Expired - Fee Related CN1217777C (en) | 1998-10-14 | 1999-10-14 | Mould for resin formation |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2000117785A (en) |
| CN (1) | CN1217777C (en) |
| IT (1) | IT1309104B1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006055419B3 (en) * | 2006-11-22 | 2007-12-13 | Miele & Cie. Kg | Injection molded plastics liquor container for washing machine, has dove-tailed connecting seam formed by colliding flow fronts of molten plastics streams, providing high stability |
| JP2010269565A (en) * | 2009-05-25 | 2010-12-02 | Univ Of Tokyo | Mold for forming pulp molded article and method of forming pulp molded article |
| JP5896098B2 (en) | 2010-12-09 | 2016-03-30 | 株式会社エンプラス | Lens array |
| JP2017172736A (en) * | 2016-03-24 | 2017-09-28 | Ntn株式会社 | Resin-made cage for bearing, manufacturing method of the same and rolling bearing |
| JP6823546B2 (en) * | 2017-06-02 | 2021-02-03 | 株式会社ブリヂストン | Manufacturing method for injection molding dies, resin members, and resin products |
| CN111565906B (en) * | 2017-12-28 | 2022-08-23 | 株式会社电装 | Resin molded article and method for producing same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5268260A (en) * | 1975-10-27 | 1977-06-06 | Hitachi Ltd | Mold for molding article |
| JPS5915809B2 (en) * | 1976-08-11 | 1984-04-11 | 株式会社日立製作所 | Mold for injection molded products |
| JPS5860421U (en) * | 1981-10-21 | 1983-04-23 | カルソニックカンセイ株式会社 | injection mold |
| JPS6380114U (en) * | 1986-11-12 | 1988-05-27 | ||
| JPH0216020A (en) * | 1988-07-04 | 1990-01-19 | Mazda Motor Corp | Injection molding device |
| JPH06275246A (en) * | 1993-03-24 | 1994-09-30 | Shin Kobe Electric Mach Co Ltd | Manufacture of mono-block battery jar |
| JP3411142B2 (en) * | 1994-12-20 | 2003-05-26 | 株式会社日立製作所 | Injection molded article, its manufacturing method, and its mold |
| JP3027139B2 (en) * | 1998-05-20 | 2000-03-27 | ユニチカ株式会社 | Resin molding |
-
1998
- 1998-10-14 JP JP10309449A patent/JP2000117785A/en active Pending
-
1999
- 1999-10-13 IT IT1999TO000886A patent/IT1309104B1/en active
- 1999-10-14 CN CN99121534.6A patent/CN1217777C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ITTO990886A1 (en) | 2001-04-13 |
| CN1250715A (en) | 2000-04-19 |
| IT1309104B1 (en) | 2002-01-16 |
| ITTO990886A0 (en) | 1999-10-13 |
| JP2000117785A (en) | 2000-04-25 |
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Granted publication date: 20050907 Termination date: 20121014 |