CN110561700A - Anti-tip-whitening structure of deep-cavity injection mold - Google Patents
Anti-tip-whitening structure of deep-cavity injection mold Download PDFInfo
- Publication number
- CN110561700A CN110561700A CN201910879449.2A CN201910879449A CN110561700A CN 110561700 A CN110561700 A CN 110561700A CN 201910879449 A CN201910879449 A CN 201910879449A CN 110561700 A CN110561700 A CN 110561700A
- Authority
- CN
- China
- Prior art keywords
- fixing screw
- cavity
- ejector
- injection mold
- straight
- 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.)
- Pending
Links
- 238000002347 injection Methods 0.000 title claims abstract description 19
- 239000007924 injection Substances 0.000 title claims abstract description 19
- 239000011347 resin Substances 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims description 4
- 230000002087 whitening effect Effects 0.000 abstract 1
- 239000004033 plastic Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
- B29C45/401—Ejector pin constructions or mountings
Abstract
The invention discloses an anti-whitening structure of a deep cavity injection mold, which relates to the technical field of large injection molds and can comprise a straight ejector block and an ejector pin, wherein the bottom of the straight ejector block is provided with the ejector pin, the ejector pin and the ejector pin are arranged on a top plate, and the tops of the straight ejector block and the ejector pin are used for ejecting a product; the bottom of the ejector rod is connected with the top plate through a fixing screw, spring resin is sleeved on the periphery of the fixing screw, and the fixing screw can move up and down along the spring resin; and a gasket is arranged at the top of the fixing screw and used for compressing the spring resin. The anti-whitening structure of the deep cavity injection mold effectively solves the problem of whitening of the product.
Description
Technical Field
the invention relates to the technical field of large-scale injection molds, in particular to a top-white prevention structure of a deep-cavity injection mold.
Background
In the prior art, deep cavity molds are ejected by using a straight ejector block 5, and when the structural shape of the top of a product is more complex, an ejector pin 1 is required to be added to increase the ejection area, as shown in fig. 1-2. However, the product 4 on the thimble 1 is always white, and the product is scrapped.
The thermoplastic plastic has the characteristics that the thermoplastic plastic expands after being heated and contracts after being cooled, and the size of a plastic product can be reduced after a die is opened; due to the structure of the mold, the bottom of the deep-cavity product 4 will shrink toward the top, which will cause the straight top block 5 used for ejecting the bottom of the product to be unable to contact with the product surface, forming a gap, and thus the ejection is delayed! However, the ejector pin 1 for ejecting the product directly acts on the surface of the product, the overall ejecting force for ejecting the product is insufficient, and the phenomenon of blank ejection occurs.
Disclosure of Invention
The invention aims to provide a top-white prevention structure of a deep-cavity injection mold, aiming at the defects of the existing method, and effectively solving the problem of top-white of products.
in order to achieve the purpose, the invention provides the following scheme: the invention provides a deep cavity injection mold anti-blank ejection structure, which comprises a straight ejector block and an ejector pin, wherein the bottom of the straight ejector block is provided with an ejector rod, the ejector rod and the bottom of the ejector pin are arranged on a top plate, and the tops of the straight ejector block and the ejector pin are used for ejecting a product; the bottom of the ejector rod is connected with the top plate through a fixing screw, spring resin is sleeved on the periphery of the fixing screw, and the fixing screw can move up and down along the spring resin; and a gasket is arranged at the top of the fixing screw and used for compressing the spring resin.
preferably, the outer ring of the ejector rod is provided with an ejector rod guide sleeve.
preferably, a first cavity and a second cavity are arranged in the top plate, the end part of the fixing screw is installed in the first cavity, and the fixing screw penetrates through the top of the top plate and is connected with the ejector rod; the gasket and the spring resin are arranged in the second cavity, and the gasket is located above the spring resin and used for compressing the spring resin.
Preferably, a gap is left between the end of the fixing screw and the first cavity, so that the end of the fixing screw moves up and down in the first cavity.
Preferably, a through hole is formed in the top plate and used for enabling the fixing screw to move up and down; the through hole is communicated with the first cavity and the second cavity and penetrates through the top of the top plate.
Preferably, the top of the ejector rod is connected with the straight ejector block through a screw.
Preferably, a spring washer is arranged at the joint of the screw and the straight jacking block.
Compared with the prior art, the invention has the following technical effects:
According to the invention, parts such as the gasket, the spring resin, the fixing screw and the like are added on the ejector rod of the straight ejector block, after the mold is opened, the straight ejector block is separated from the A plate, the compressed spring resin recovers the original shape, the elasticity is provided for the straight ejector block, the straight ejector block is always attached to the surface of a product, and the problem of white ejection of the product is effectively solved.
Drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional straight ejector block ejection mechanism;
FIG. 2 is an enlarged schematic view of FIG. 1 at A;
FIG. 3 is a schematic structural view of an anti-lift structure of the deep cavity injection mold of the present invention;
FIG. 4 is a first enlarged view at B in FIG. 3;
FIG. 5 is a second enlarged view at B in FIG. 3;
FIG. 6 is an enlarged schematic view of FIG. 3 at C;
Wherein, 1, a thimble; 2. a movable die insert core; 3. a, a plate; 4. producing a product; 5. a straight top block; 6. a spring washer; 7. a top rod; 8. a mandril guide sleeve; 9. b, plate; 10. a gasket; 11. a spring resin; 12. and fixing the screw.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a top-white prevention structure of a deep-cavity injection mold, aiming at the defects of the existing method, and effectively solving the problem of top-white of products.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
As shown in fig. 3-6, this embodiment provides a deep cavity injection mold anti-blank ejection structure, including a straight ejector block 5 and an ejector pin 1, a ejector rod 7 is installed at the bottom of the straight ejector block 5, the ejector rod 7 and the bottom of the ejector pin 1 are installed on a top plate, and the tops of the straight ejector block 5 and the ejector pin 1 are used for ejecting a product 4; the bottom of the ejector rod 7 is connected with the top plate through a fixing screw 12, spring resin 11 is sleeved on the periphery of the fixing screw 12, and the fixing screw 12 can move up and down along the spring resin 11; the top of the set screw 12 is provided with a washer 10 for pressing the spring resin 11. Specifically, the outer ring of the ejector rod 7 is provided with an ejector rod guide sleeve 8 for guiding.
In this embodiment, a first cavity and a second cavity are arranged in the top plate, an end portion of the fixing screw 12 is installed in the first cavity, and the fixing screw 12 penetrates through the top of the top plate and is connected with the ejector rod 7; the washer 10 and the spring resin 11 are disposed in the second cavity, and the washer 10 is located above the spring resin 11 for compressing the spring resin 11.
preferably, a gap is left between the end of the fixing screw 12 and the first cavity, so that the end of the fixing screw 12 moves up and down in the first cavity. A through hole is formed in the top plate and used for enabling the fixing screw 12 to move up and down; the through hole is communicated with the first cavity and the second cavity and penetrates through the top of the top plate.
in this embodiment, the top of the top rod 7 is connected with the straight top block 5 through a screw, and a spring washer 6 is arranged at the connection position of the screw and the straight top block 5.
The working principle of the embodiment is as follows:
After the injection molding of the mold is completed, the mold is opened, the product 4 is cooled and then contracted, and the size of the product (plastic part) 4 is reduced; after the mold is opened, the straight ejector block 5 is separated from the A plate 3, and the compressed spring resin 11 is restored to the original shape, so that the straight ejector block 5 is provided with elasticity and is always attached to the surface of a product.
The stroke of ST can be calculated by the following formula;
ST＝M x S
Wherein M-the height of the part; s-shrinkage ratio; ST-distance required to be ejected in advance;
The shrinkage rate of plastic parts is a range, and the shrinkage rates of various materials are different; shrinkage can be determined from shrinkage provided by the plastic manufacturer, in combination with practical experience including similar parts produced in the past.
After the mold is opened, the straight ejector block 5 is ejected out for a certain distance ST before the ejector pin 1 under the elastic action of the spring resin 11, and then the upper ejector plate and the lower ejector plate are ejected out under the action of an ejector rod on an oil cylinder or an injection molding machine, so that the effect of synchronously ejecting a product by the straight ejector block 5 and the ejector pin 1 is achieved; by adopting the structure, the straight ejector block 5 and the ejector pin 1 are synchronously ejected.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A deep cavity injection mold anti-blank ejection structure comprises a straight ejector block and an ejector pin, wherein the bottom of the straight ejector block is provided with an ejector rod, the ejector rod and the bottom of the ejector pin are arranged on a top plate, and the tops of the straight ejector block and the ejector pin are used for ejecting a product; the method is characterized in that: the bottom of the ejector rod is connected with the top plate through a fixing screw, spring resin is sleeved on the periphery of the fixing screw, and the fixing screw can move up and down along the spring resin; and a gasket is arranged at the top of the fixing screw and used for compressing the spring resin.
2. The deep cavity injection mold anti-tip-white structure of claim 1, wherein: and an ejector rod guide sleeve is arranged on the outer ring of the ejector rod.
3. The deep cavity injection mold anti-tip-white structure of claim 1, wherein: a first cavity and a second cavity are arranged in the top plate, the end part of the fixing screw is arranged in the first cavity, and the fixing screw penetrates through the top of the top plate and is connected with the ejector rod; the gasket and the spring resin are arranged in the second cavity, and the gasket is located above the spring resin and used for compressing the spring resin.
4. The deep cavity injection mold anti-tip-white structure of claim 3, wherein: a gap is reserved between the end part of the fixing screw and the first cavity and used for enabling the end part of the fixing screw to move up and down in the first cavity.
5. The deep cavity injection mold anti-tip-white structure of claim 4, wherein: a through hole is formed in the top plate and used for enabling the fixing screw to move up and down; the through hole is communicated with the first cavity and the second cavity and penetrates through the top of the top plate.
6. the deep cavity injection mold anti-tip-white structure of claim 1, wherein: the top of the ejector rod is connected with the straight ejector block through a screw.
7. the deep cavity injection mold anti-tip-white structure of claim 6, wherein: and a spring washer is arranged at the joint of the screw and the straight jacking block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910879449.2A CN110561700A (en) | 2019-09-18 | 2019-09-18 | Anti-tip-whitening structure of deep-cavity injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910879449.2A CN110561700A (en) | 2019-09-18 | 2019-09-18 | Anti-tip-whitening structure of deep-cavity injection mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110561700A true CN110561700A (en) | 2019-12-13 |
Family
ID=68780690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910879449.2A Pending CN110561700A (en) | 2019-09-18 | 2019-09-18 | Anti-tip-whitening structure of deep-cavity injection mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110561700A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203957222U (en) * | 2014-04-30 | 2014-11-26 | 天津瑞应鑫模具制造有限公司 | A kind of straight ejecting block |
| CN205522350U (en) * | 2016-04-20 | 2016-08-31 | 浙江赛豪实业有限公司 | Forming die's ejection mechanism |
| CN211662568U (en) * | 2019-09-18 | 2020-10-13 | 宁波跃飞模具有限公司 | Anti-tip-whitening structure of deep-cavity injection mold |
-
2019
- 2019-09-18 CN CN201910879449.2A patent/CN110561700A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203957222U (en) * | 2014-04-30 | 2014-11-26 | 天津瑞应鑫模具制造有限公司 | A kind of straight ejecting block |
| CN205522350U (en) * | 2016-04-20 | 2016-08-31 | 浙江赛豪实业有限公司 | Forming die's ejection mechanism |
| CN211662568U (en) * | 2019-09-18 | 2020-10-13 | 宁波跃飞模具有限公司 | Anti-tip-whitening structure of deep-cavity injection mold |
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