CN108973020A - A kind of injection mold being used to form mold - Google Patents
A kind of injection mold being used to form mold Download PDFInfo
- Publication number
- CN108973020A CN108973020A CN201810705514.5A CN201810705514A CN108973020A CN 108973020 A CN108973020 A CN 108973020A CN 201810705514 A CN201810705514 A CN 201810705514A CN 108973020 A CN108973020 A CN 108973020A
- Authority
- CN
- China
- Prior art keywords
- mold
- plunger
- injection
- cavity
- injection mold
- 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.)
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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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of injection molds for being used to form mold, wherein mold has the flexible connection between central part and bearer ring and central part and bearer ring, injection mold has die cavity, die cavity has the plunger biased by spring arrangement towards die cavity, and the die cavity is for compensating the contraction occurred during the plastics solidification being injected into injection mold.In injection mold of the invention, the deformation on the surface of optics explication will not occur, thin wall flexible connection, which provides the material stress occurred in positioning device, will not continue to enter central part with the surface of optics explication.
Description
Technical field
The present invention relates to mold injection technical fields, and in particular to a kind of injection mold for being used to form mold.
Background technique
Known casting mould also has the second mold half part comprising the central part on the surface with optics explication
Point, around central part bearer ring and be provided with the second positioning device, it is fixed that second positioning device is designed to first
Position means for engaging.The closed position of mold, wherein the first and second mold half parts are placed on top of each other, by monomer material
Expect one be introduced into two cast mold halfs, is then placed on the second cast mold half in the half of the first casting mould, then,
Monomer material will polymerize.About the manufacturing method of plastic mo(u)lding, without disclosing relevant content in mentioned publication.?
This respect, being more can be from U.S. Patent No. 5540410 and Fig. 5 from this publication is retouched with being associated in column 10
State, 38 column 14 of line, line 3 especially illustrate, therefore understands that for by reference be incorporated herein.United States Patent (USP) 2006/145370 is also public
Open a kind of for being poured the method and injection molding of casting mould, which has optical tooling insertion piece, the optics
Tool insertion piece is detachably connected to be connected in the element in injection molding.FR1.355.74 is generally described in injection mold
The formation problem of bubble and contraction chamber when injecting plastics solidification.French Publication is also described how by using mechanically or hydraulically
Excitation piston, which is pressed into the curing process in injection mold cavities, compensates this contraction.
Although there is the casting mould described in NL1033905C the second mold half can be fixed in the first mold half
Positioning device, but due to mold half part can be crushed in biasing top on plain mode and it is particularly advantageous.Positioning
Device does not need external agency to reach this purpose, still, about with this known Casting mold manufacturing contact lenses or people
The precision of the lenticular optical surface of work still has a problem.
Technical solution
The invention mainly solves the technical problem of providing a kind of injection molds for being used to form mold, which is characterized in that
It is formed at least including the first injection molding half module, the second injection molding half module and between the first injection molding half module and the second injection molding half module
One injection mold cavity, at least one described injection mold cavity include center portion cavity, bearing ring cavity and connect center portion cavity
It is connected to the connection cavity of bearer ring cavity；Plunger in the first injection molding half portion, the plunger can be along the plungers
Central axis it is mobile, the plunger has the end face in face of the injection mold cavities and forms the boundary of the central part chamber；
The second injection mold half portion is pushed the plunger towards with spring.
It optionally, further include the first retainer, which forms for transporting plunger towards the second injection mold half portion
Dynamic boundary.
Optionally, including the second retainer, second retainer formed for make plunger from pushed position be moved to
The boundary of injection mold cavities stop position spaced apart.
Optionally, wherein spring includes one or more Belleville springs.
Optionally, the side of the center portion cavity is limited by the end face of the plunger, and in second injection
The peripheral wall that the opposite side of the wall part of mould cavity limits the center portion cavity is chamfered, so that from described in the plunger
The direction of longitudinal center axis A is observed, and the diameter of the center portion cavity is molded half module from the plunger towards described second
It is gradually increased.
The beneficial effects of the present invention are:
Optics will not occur for a kind of injection mold for being used to form mold of the invention accurately fixed in the casting mould
Justice surface deformation, thin wall flexible connection provide the material stress occurred in positioning device will not continue to it is accurate with optics
The surface of definition enters central part.
Detailed description of the invention
Fig. 1 shows the embodiment of the mold in the explosion mold for manufacturing contact lens from first angle.
Fig. 2 shows the exemplary embodiment of the mold of Fig. 1 in explosive view from the second viewpoint.
Fig. 3 shows exemplary embodiment of the casting mould of Fig. 1 in top view.
Fig. 4 shows the sectional view of the IV-IV line along Fig. 3.
Fig. 5 shows the perspective view of the second exemplary embodiment of the second mold half module.
Embodiment
The preferred embodiments of the present invention will be described in detail below so that advantages and features of the invention can be easier to by
It will be appreciated by those skilled in the art that so as to make a clearer definition of the protection scope of the present invention.
Fig. 1-4 shows the exemplary embodiment of the casting mould 10 for manufacturing contact lens.Casting mold 10 has first
Casting mold half 12.First mold, half 12 surface 14 with optics explication and the first positioning device 16-18.In exemplary implementation
In example, the first positioning device 16-18 is designed in the substantially round ribs 17 on the surface 14 of optics explication
Recess portion 16, and the generally circular clamped edge 18 extended around circular support rib 17, form an entirety of outer edge 19
Part.In the two sides of gripper edge 18, extend annular surface 18a, the 18b radially outward widened from gripper edge 18, is formed outer
The a whole part at edge 19, and position the second casting mold half module 20 relative to the first casting mold half module 12.However, in another kind
In elaboration, the first positioning device 16-18 also can be configured as protrusion or protrusion.Casting mould 10 is additionally provided with the second mold half
20, the second casting mold half module 20 has central part 22, the surface 24 with optics explication, and the second mold half 20 also has
Around the bearer ring 28 of central part 22, which has the second positioning device 26, and the second positioning device 26 is designed to
The first positioning device 16-18 is engaged in the closed position of casting mould 10, wherein the first and second casting mould half parts 12,20
It puts together each other, wherein the first and second positioning device 16-18,26 conditions being interconnected generate clamping force, the biasing
Second mold half 20 is pressed on the first mold half 12 by power under bias.In the illustrated exemplary embodiment, the second positioning dress
Set 26 legs for being designed to radially extend.In this exemplary embodiment, clamping force is by the recess portion 16 in ribs 17
In carried out curved leg 26 by the part radially-inwardly positioned and generated, and pass through the radial direction below clamped edge 18
Outer end is bitten broken, and wherein leg 26 must be bent.Positioning device 16-18 not only has two cast mold halfs 12,20 are relative to each other
The function of feeling relieved and mutually clamp, but also there is the function for the relative rotation position for limiting two casting mold half portions 12,20.Second
The central axis L of mold 20 extends perpendicular to the plane for extending bearer ring 28, and intersects with the center of bearer ring 28.Second casting mold
Half module 20 has the flexible connecting member 30 of thin-walled, which extends between bearer ring 28 and central part 22, and by central part
22 are connected to bearer ring 28.In the first embodiment of the second casting mold semi-finished product 20, an example is shown in Fig. 1-4, it is flexible
Connector 30 can be configured as annular plastics film 30a, which is connected to bearer ring 28 simultaneously by its outer edge
Central part 22 is connected to by inner edges.Such film connection provides good flexibility, to make 22 phase of central part
For the freedom of motion of bearer ring 28, this is important for not transmitting material stress, this is by the second casting mold semi-finished product 20
Occur when being clipped on the first casting mold semi-finished product 12.The optical surface 24 of the explication of second casting mold semi-finished product 20.With annular
Plastic foil 30A is processed, and sizable throughflow surface is provided, this is in the fabrication process in injection mold 50 from bearing
Ring cavity provides plastics to center cavity and is very important.In addition, central part 22 power from whole circumference to bearer ring 28
Transmitting is uniformly that under the influence of this to apply power on it in lens manufacturing process, the deformation of central part 22 is most
It is small.In the second alternate embodiment of the second casting mould 20, an example is wherein shown in Fig. 5, flexible connecting member 30 can
To be realized by multiple spoke 30b, each spoke 30b is connected to central part 22 by first end, and is connected by second end
To bearer ring 28, spoke can extend radially into bearer ring 28 from central part 22, however, in another embodiment, spoke
May also slightly it extend in tangential direction.In one embodiment, thin wall flexible connection 30,30a, 30b, which have, is less than bearing
0.2 times of wall thickness of the thickness of ring 28.Preferably, 0.1 of wall thickness less than bearing ring thickness of flexible connecting member 30,30a, 30b
Times, when the wall thickness of thin wall flexible connector 30,30a, 30b center related with the position of central axis of the second casting mold half module 20
When the thickness of part 22, it in one embodiment keep thin wall flexible connection 30,30a, 3 wall thickness be less than central part 22
0.1 times in cental axial position of 0.2 times of thickness, the more preferably less than thickness of central axis 22.Table relative to optics explication
Face 24, the central part 22 of the second mold 20 have the second main surface 32, which is basically perpendicular to the second mold
10 central axis L extends.Central part 22 is additionally provided with circumferential surface 34, table of the circumferential surface 34 in optics explication
Extend between face 24 and the second main surface 32.One embodiment is characterized in that circumferential surface 34 is chamfered, so that central part
22 diameter gradually decreases to the surface 24 of optics explication from the second main surface 32 in terms of the direction of central axis L.Do not having
In the case where the chamfering structure for having circumferential surface 34-4, that is, there is the circumferential surface perpendicular to the second main surface 32, in the second casting
In the manufacturing process of mould, deviated on the periphery on the surface of optics explication 24, this deviation is seemingly in this perimeter
The result of neighbouring cooling effect.By the chamfering structure of circumferential surface 34, it can significantly reduce the deviation of perimeter.Central axis
The angle that angle between L and chamfering circumferential edges is 15~45 degree is enough.
The sequencing of above embodiments is not only for ease of description, represent the advantages or disadvantages of the embodiments.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (5)
1. a kind of injection mold for being used to form mold characterized by comprising first injection molding half module, second injection molding half module and
At least one injection mold cavity formed between the first injection molding half module and the second injection molding half module, at least one described injection mould
Chamber includes center portion cavity, bearing ring cavity and the connection cavity that center portion cavity is connected to bearer ring cavity；Described
Plunger in first injection molding half portion, the plunger can be moved along the central axis of the plunger, and the plunger, which has, to be faced
The end face of the injection mold cavities and the boundary for forming the central part chamber；Spring pushes the plunger towards the second injection mold half portion.
2. a kind of injection mold for being used to form mold according to claim 1, it is characterised in that: further include the first stop
Part, first retainer form the boundary for moving plunger towards the second injection mold half portion.
3. a kind of injection mold for being used to form mold according to claim 2, it is characterised in that: including the second stop
Part, second retainer form the side for making plunger be moved to from pushed position the stop position being spaced apart with injection mold cavities
Boundary.
4. a kind of injection mold for being used to form mold according to claim 1, it is characterised in that: wherein spring includes one
A or multiple Belleville springs.
5. a kind of injection mold for being used to form mold according to claim 1, it is characterised in that: the center portion is empty
The side of chamber is limited by the end face of the plunger, and limits institute in the opposite side of the wall part of the second injection molding cavity
The peripheral wall for stating center portion cavity is chamfered so that from the direction of the longitudinal center axis A of the plunger, it is described in
The diameter of portion cavity is entreated to be gradually increased from the plunger towards the second injection molding half module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810705514.5A CN108973020A (en) | 2018-07-02 | 2018-07-02 | A kind of injection mold being used to form mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810705514.5A CN108973020A (en) | 2018-07-02 | 2018-07-02 | A kind of injection mold being used to form mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108973020A true CN108973020A (en) | 2018-12-11 |
Family
ID=64539217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810705514.5A Withdrawn CN108973020A (en) | 2018-07-02 | 2018-07-02 | A kind of injection mold being used to form mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108973020A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114845851A (en) * | 2019-12-18 | 2022-08-02 | Zkw集团有限责任公司 | Method for producing a holding device |
-
2018
- 2018-07-02 CN CN201810705514.5A patent/CN108973020A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114845851A (en) * | 2019-12-18 | 2022-08-02 | Zkw集团有限责任公司 | Method for producing a holding device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181211 |
|
| WW01 | Invention patent application withdrawn after publication |