CN103753773A - Improved structure of pouring gate sprue of injection molding mould - Google Patents
Improved structure of pouring gate sprue of injection molding mould Download PDFInfo
- Publication number
- CN103753773A CN103753773A CN201410035249.6A CN201410035249A CN103753773A CN 103753773 A CN103753773 A CN 103753773A CN 201410035249 A CN201410035249 A CN 201410035249A CN 103753773 A CN103753773 A CN 103753773A
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- CN
- China
- Prior art keywords
- sprue bush
- sprue
- groove
- air inlet
- injection block
- 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
- 238000001746 injection moulding Methods 0.000 title abstract description 6
- 238000002347 injection Methods 0.000 claims description 65
- 239000007924 injection Substances 0.000 claims description 65
- 238000007789 sealing Methods 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 abstract description 15
- 239000004033 plastic Substances 0.000 abstract description 15
- 238000000926 separation method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 17
- 238000000465 moulding Methods 0.000 description 4
- 231100000241 scar Toxicity 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000000243 solution Substances 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
- B29C2045/2714—Gates elongated, e.g. film-like, annular
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides an improved structure of a pouring gate sprue of an injection molding mould. A sprue bush is in a shape of a disk; a conical pouring gate with a large upper end and a small lower end is formed inside a disk shaft along an axis; a circle of an annular through groove is formed in an upper disk face around the disk shaft; an air inlet groove communicated with the through groove is formed in the upper disk face on the outer side of the through groove; the upper end of the disk shaft of the sprue bush is externally sleeved with a pushing block; a protruding ring-shaped flange is arranged outside the lower end of the pushing block; a spherical flute, an aggregate groove and a center hole are formed at the center of the upper end of the pushing block; the upper end of the disk shaft of the sprue bush is located inside the center hole; the upper end of an inner hole of a positioning ring protrudes inwards, so as to limit the pushing distance of the pushing block; the bottom of the positioning ring is tightly adhered to the upper disk face of the sprue bush; an air inlet through hole communicated with the air inlet groove is formed in the lateral part of the positioning ring. The improved structure provided by the invention simplifies the mould structure and the pouring gate structure; the effect of a three-plate mould can be achieved through a two-plate mould; the manufacture cost of the mould can be greatly reduced; the separation operation between aggregate and a product is simple and convenient; the pouring trace is small; the surface quality of a plastic part is improved.
Description
Technical field
The present invention relates to injection mold, relate in particular to sprue gating structure.
Background technology
Cast gate is molten plastic enters die cavity last " door " together by running gate system, it is the feeding-passage that connects running channel and die cavity, also be the shortest and the smallest part, its effect makes molten plastic when entering die cavity, produce acceleration, is conducive to be full of rapidly die cavity, the first condensation of cast gate plastics after moulding, with near closed hollow ring, prevent that molten plastic from flowing backwards, and avoids cavity pressure to decline too fast, so that produce shrinkage cavity or depression on goods, be convenient to make to pour into a mould solidifying material after moulding separation with goods.
Common cast gate kind comprises down gate, side gate, spot pouring mouth, tunnel gate and ear type cast gate, the factors such as the requirement of products appearance, the restriction of size and dimension and the plastics kind using are depended in the selection of gate type, and gate shape and size are very large on plastic part quality impact.
Spot pouring mouth is applicable to various forms of goods, and its advantage is: the one, and when molten plastic flows by cast gate, flow velocity increases, and adds the effect of frictional force, and the temperature of stream of plastic raises.Like this, profile can be obtained clear, the plastic of lustrous surface.The 2nd, determine that the position of cast gate is very flexible.
But all more complicated of mould with pin point gate and pouring gate structure, generally will adopt pair die joint moulds (three template dies) just can deviate from condensed material in runner, and after die sinking, solidifying material is more loaded down with trivial details with the lock out operation between goods, mould structure complexity, cost is high; If adopt single die joint mould (two template dies), easily damage goods during fracture or on goods, leave larger scar, affect the aesthetics of finished product, but mould structure is simple, cost is low.How reconstruct sprue gating structure, in single die joint mould (two template dies), realize die sinking after solidifying material separation with goods, to realize the effect of spot pouring mouth (three template dies), just become a technical barrier in a current industry.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of structure-improved of sprue gating, can in single die joint mould (two template dies), realize die sinking after solidifying material separation with goods, and there is spot pouring mouth (three template dies).Simplified mould and pouring gate structure, solidifying material energy automatic breaking, and scar is less.
The present invention is achieved by the following technical solutions:
A sprue gating structure-improved for injection mold, is characterized in that:
Sprue bush is disk-shaped, core place, with a dish axle, offers along axis the taper running channel that upper end open size is large, lower ending opening size is little in dish axle, and on upper disk surface, drum axle is offered a circle annular through groove, on the upper disk surface in groove outside, offer one section of air inlet duct being connected with groove
Outside the dish axle upper end of sprue bush, be nested with the injection block of cylindricality, injection block is positioned at the card top of sprue bush, injection block lower end is an outstanding circle annular flange flange outwards, flange outside diameter is greater than groove external diameter, and spherical groove is offered at center, injection block upper end, and solidifying hopper is offered in the bottom of spherical groove, centre bore is offered in solidifying hopper bottom, the dish axle upper end of sprue bush is positioned at centre bore, and dish shaft diameter and center-hole diameter match
Injection block is nested with annular centring ring outward, centring ring internal diameter and injection block external diameter match, the endoporus upper end of centring ring is an outstanding circle spacing back-up ring corresponding with flange inwardly, centring ring external diameter is greater than the disk track of sprue bush, the upper disk surface of sprue bush is close in centring ring bottom, the vertical air inlet through hole being connected with air inlet duct of offering on centring ring
Injection block can move up and down vertically in centring ring, when contacting with the upper disk surface of sprue bush bottom injection block comes downwards to, the dish axle upper end of sprue bush is concordant with solidifying hopper bottom, when injection block goes upward to flange and contacts with spacing back-up ring, the dish axle upper end of sprue bush and solidifying hopper bottom depart from.
Under matched moulds state, the spheroidal injection nozzle of injection machine stretches in spherical groove, and the running channel that molten plastic flows in solidifying hopper, the sprue bush of flowing through under pressure-driven in injection block enters die cavity injection mo(u)lding, and after moulding pressurize certain hour, injection nozzle reclaims; During die sinking, compressed air enters in groove by air inlet through hole, air inlet duct, thereby make injection block upwards extrude motion until touch spacing back-up ring, solidifying material in running channel disconnects with goods and is separation, in solidifying hopper, take out solidifying material, stop, to the groove injecting compressed air of injection block below, groove being communicated with normal pressure atmosphere.Next time is during matched moulds, and injection nozzle stretches in spherical groove, injection block is in injection nozzle compressing and descending under doubling force, until it contacts with the upper disk surface of sprue bush, injection moulding starts.
Further, be set with a circle sealing ring in the annular flange flange of injection block, sealing ring is not only to playing the effect of sealing between annular flange flange and centring ring, and can also prevent the hard friction between annular flange flange and centring ring, avoids stuck.
Further again, the cone angle of running channel is 4～6 degree, to guarantee that the pressure loss is little, releases easily.
Further again, columniform cast gate is offered in the center, dish axle lower end of sprue bush, and running channel lower end is communicated with cast gate, both diameter ratios are 3～5, and to guarantee to produce enough injection pressures, the height of cast gate is 0.2～1.5, with assurance, break easily, prevent that material from refluxing, gate vestiges is little.
Further again, for ease of flowing and solidifying taking-up of expecting of molten plastic stream, solidifying hopper is truncated cone-shaped, and notch diameter is greater than groover rot diameter.
Further again, air inlet through hole is nested with an air inlet pipe import, be convenient to compressed gas source be connected and compressed gas source, normal pressure atmosphere between switching.
It should be noted that, upper and lower, the inside and outside position relationship in description and accompanying drawing be only for convenience and use a kind of relative position relationship, be not the absolute limitations to described orientation.
Beneficial effect of the present invention is:
1, adopt two template dies to replace three template dies, simplified mould structure and pouring gate structure, reduced the manufacturing cost of mould;
2, after die sinking, the lock out operation between solidifying material and goods is easy, and the vestige staying on plastic member product is not obvious, does not affect the attractive in appearance of plastic surface, has improved the yield rate of goods.
Accompanying drawing explanation
Fig. 1 is the sprue gating structural representation of existing a kind of three template die mould with pin point gate
Fig. 2 generalized section of facing of the present invention
Fig. 3, Fig. 4 are respectively top view and the elevation cross-sectional view of sprue bush
Fig. 5 is the elevation cross-sectional view of injection block
Fig. 6 is the elevation cross-sectional view of centring ring
The cooperation schematic diagram of each workpiece when Fig. 7, Fig. 8 are respectively injection moulding and fracture
In Fig. 1～8: 1 is cover half, 2 is core, and 3 is push piece plate, and 4 for angling material bar, 5 is existing sprue bush, and 6 is top clamping plate, and 7 is push rod, and 8 is gag lever post, 26 is sealing ring, and 27 is sprue bush, and 271 is running channel, and 272 is groove, 273 is air inlet duct, and 274 is cast gate, and 28 is solidifying material, and 29 is injection block, 291 is flange, and 292 is spherical groove, and 293 is solidifying hopper, and 31 is centring ring, 311 is spacing back-up ring, and 312 is air inlet through hole, and 30 is air inlet pipe import.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, all more complicated of existing mould with pin point gate and pouring gate structure, the general pair die joint moulds (three template dies) that adopt are just convenient to condensed material in runner, and the lock out operation after die sinking between solidifying material and goods is more loaded down with trivial details, during fracture, easily damage goods or on goods, leave larger scar, affecting the aesthetics of finished product.
As shown in Figure 2, the sprue bush 27, injection block 29 and the centring ring 31 that inside and outside sprue gating structure of the present invention comprises, are nested with in turn, wherein:
As shown in Fig. 3～4, sprue bush 27 is disk-shaped, core place is with a dish axle, in dish axle, along axis, offer the taper running channel 271 that upper end open size is large, lower ending opening size is little, the cone angle of running channel 271 is 4-6 degree, and columniform cast gate 274 is offered in dish center, axle lower end, and running channel 271 lower ends are communicated with cast gate 274, on upper disk surface, drum axle is offered a circle annular through groove 272, offers one section of air inlet duct 273 being connected with groove 272 on the upper disk surface in groove 272 outsides.
As shown in Figure 5, injection block 29 lower ends of cylindricality are an outstanding circle annular flange flange 291 outwards, flange 291 external diameters are greater than groove 272 external diameters, spherical groove 292 is offered at injection block 29 centers, upper end, the solidifying hopper 293 that is truncated cone-shaped is offered in the bottom of spherical groove 291, notch diameter is greater than groover rot diameter, and centre bore is offered in solidifying hopper 293 bottoms.
As shown in Figure 6, the endoporus upper end of the centring ring 31 of annular is an outstanding circle spacing back-up ring 311 corresponding with flange 291 inwardly, and centring ring 31 external diameters are greater than the disk track of sprue bush 27, the vertical air inlet through hole 312 of offering on centring ring 31.
When sprue bush 27, injection block 29 and centring ring 31 are nested with, injection block 29 is positioned at the card top of sprue bush 27, and the dish axle upper end of sprue bush 27 is positioned at injection block 29 centre bores, and dish shaft diameter and center-hole diameter match; In the annular flange flange 291 of injection block 29, be set with a circle sealing ring 26, mating surface between centring ring 31 and injection block 29 is played to sealing function, the upper disk surface of sprue bush 27 is close in centring ring 31 bottoms, air inlet through hole 312 on centring ring 31 is connected with air inlet duct 273, and air inlet through hole 312 is nested with an air inlet pipe import 30.
As shown in Fig. 7～8, when cast gate 27, injection block 29 and centring ring 31 are assembled on top clamping plate 6, first centring ring 31 is packed in the shoulder hole of top clamping plate 6, be set with again injection block 29, finally load onto centring ring 31, centring ring 31 by bolt-locking on top clamping plate 6, thereby cast gate 27 is fixed thereunder.For the sealing of assurance device, between centring ring 31 and top clamping plate 6, configure a circle sealing ring 26, between the lower card of sprue bush 27 and top clamping plate 6, configure a circle sealing ring 26.
During injection moulding, injection block 29 comes downwards to bottom and contacts with the upper disk surface of sprue bush 27, and now, the dish axle upper end of sprue bush 27 is concordant with solidifying hopper 293 bottoms, as shown in Figure 7;
During fracture, injection block 29 goes upward to flange 291 and contacts with spacing back-up ring 311, and now, the dish axle upper end of sprue bush 27 and solidifying hopper 293 bottoms depart from, and the solidifying material 28 that is " T " font is pushed out piece 29 and extracts in cast gate 274, as shown in Figure 8.
Under matched moulds state, the spheroidal injection nozzle of injection machine stretches in the spherical groove 292 that vallecular cavity shape matches with it, the running channel 271 that molten plastic flows in solidifying hopper 293, the sprue bush 27 of flowing through under pressure-driven in injection block 29 enters die cavity injection mo(u)lding, after moulding pressurize certain hour, injection nozzle reclaims; During die sinking, compressed air enters in groove 272 by air inlet through hole 312, air inlet duct 273, thereby make injection block 29 upwards extrude motion until touch spacing back-up ring 311, solidifying material in running channel 271 disconnects with goods and is separation, from the solidifying material of the solidifying interior taking-up of hopper 293, stop groove 272 injecting compressed airs to injection block 29 belows, groove 272 is communicated with normal pressure atmosphere.Next time is during matched moulds, and injection nozzle stretches in spherical groove 292, injection block 29 is in injection nozzle compressing and descending under doubling force, until it contacts with the upper disk surface of sprue bush 27, injection moulding starts.
Claims (6)
1. a sprue gating structure-improved for injection mold, is characterized in that:
Sprue bush (27) is disk-shaped, core place is with a dish axle, in dish axle, along axis, offer the taper running channel (271) that upper end open size is large, lower ending opening size is little, on upper disk surface, around dish axle, offered a circle annular through groove (272), on the upper disk surface in groove (272) outside, offer one section of air inlet duct (273) being connected with groove (272)
Outside the dish axle upper end of sprue bush (27), be nested with the injection block (29) of cylindricality, injection block (29) is positioned at the card top of sprue bush (27), injection block (29) lower end is an outstanding circle annular flange flange (291) outwards, flange (291) external diameter is greater than groove (272) external diameter, spherical groove (292) is offered at injection block (29) center, upper end, solidifying hopper (293) is offered in the bottom of spherical groove (291), centre bore is offered in solidifying hopper (293) bottom, the dish axle upper end of sprue bush (27) is positioned at centre bore, dish shaft diameter and center-hole diameter match
The outer annular centring ring (31) that is nested with of injection block (29), centring ring (31) internal diameter and injection block (29) external diameter match, the endoporus upper end of centring ring (31) is an outstanding circle spacing back-up ring (311) corresponding with flange (291) inwardly, centring ring (31) external diameter is greater than the disk track of sprue bush (27), the upper disk surface of sprue bush (27) is close in centring ring (31) bottom, the upper vertical air inlet through hole (312) being connected with air inlet duct (273) of offering of centring ring (31)
Injection block (29) can move up and down vertically in centring ring (31), when contacting with the upper disk surface of sprue bush (27) bottom injection block (29) comes downwards to, the dish axle upper end of sprue bush (27) is concordant with solidifying hopper (293) bottom, when injection block (29) goes upward to flange (291) and contacts with spacing back-up ring (311), the dish axle upper end of sprue bush (27) and solidifying hopper (293) bottom depart from.
2. the sprue gating structure-improved of injection mold according to claim 1, is characterized in that: the upper suit one circle sealing ring (26) of annular flange flange (291) of described injection block (29).
3. the sprue gating structure-improved of injection mold according to claim 1, is characterized in that: the cone angle of described running channel (271) is 4～6 degree.
4. the sprue gating structure-improved of injection mold according to claim 1, it is characterized in that: columniform cast gate (274) is offered in the center, dish axle lower end of described sprue bush (27), running channel (271) lower end is communicated with cast gate (274), both diameter ratios are 3～5, and the height of cast gate (274) is 0.2～1.5mm.
5. the sprue gating structure-improved of injection mold according to claim 1, is characterized in that: described solidifying hopper (293) is truncated cone-shaped, and notch diameter is greater than groover rot diameter.
6. the sprue gating structure-improved of injection mold according to claim 1, is characterized in that: described air inlet through hole (312) is nested with an air inlet pipe import (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410035249.6A CN103753773A (en) | 2014-01-24 | 2014-01-24 | Improved structure of pouring gate sprue of injection molding mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410035249.6A CN103753773A (en) | 2014-01-24 | 2014-01-24 | Improved structure of pouring gate sprue of injection molding mould |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103753773A true CN103753773A (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410035249.6A Pending CN103753773A (en) | 2014-01-24 | 2014-01-24 | Improved structure of pouring gate sprue of injection molding mould |
Country Status (1)
| Country | Link |
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| CN (1) | CN103753773A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112659485A (en) * | 2020-12-14 | 2021-04-16 | 台州市黄岩炜大塑料机械有限公司 | Convex block type submarine gate of plastic pipe fitting mold |
| CN113000818A (en) * | 2021-02-23 | 2021-06-22 | 广州和德轻量化成型技术有限公司 | Vertical indirect extrusion casting device for vacuum pump rotor and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8033583U1 (en) * | 1980-12-18 | 1981-05-27 | Konwel-Gesellschaft mbH Konstruktions- und Werkzeugelemente, 7244 Waldachtal | DEVICE FOR SEPARATING THE INJECTION FROM INJECTION MOLDED PARTS |
| DE3237505A1 (en) * | 1982-10-09 | 1984-04-12 | Konwel-Gesellschaft mbH Konstruktions- und Werkzeugelemente, 4250 Bottrop | Device for separating the sprue from injection mouldings |
| JPH08229987A (en) * | 1995-02-24 | 1996-09-10 | Murata Mfg Co Ltd | Runner unlocking device of molding machine |
| CN201587100U (en) * | 2010-01-28 | 2010-09-22 | 潘建新 | Automatic cutting mechanism for runner condensed material |
| CN203805247U (en) * | 2014-01-24 | 2014-09-03 | 上海工程技术大学 | Improvement structure for runner sprue of injection mould |
-
2014
- 2014-01-24 CN CN201410035249.6A patent/CN103753773A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8033583U1 (en) * | 1980-12-18 | 1981-05-27 | Konwel-Gesellschaft mbH Konstruktions- und Werkzeugelemente, 7244 Waldachtal | DEVICE FOR SEPARATING THE INJECTION FROM INJECTION MOLDED PARTS |
| DE3237505A1 (en) * | 1982-10-09 | 1984-04-12 | Konwel-Gesellschaft mbH Konstruktions- und Werkzeugelemente, 4250 Bottrop | Device for separating the sprue from injection mouldings |
| JPH08229987A (en) * | 1995-02-24 | 1996-09-10 | Murata Mfg Co Ltd | Runner unlocking device of molding machine |
| CN201587100U (en) * | 2010-01-28 | 2010-09-22 | 潘建新 | Automatic cutting mechanism for runner condensed material |
| CN203805247U (en) * | 2014-01-24 | 2014-09-03 | 上海工程技术大学 | Improvement structure for runner sprue of injection mould |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112659485A (en) * | 2020-12-14 | 2021-04-16 | 台州市黄岩炜大塑料机械有限公司 | Convex block type submarine gate of plastic pipe fitting mold |
| CN113000818A (en) * | 2021-02-23 | 2021-06-22 | 广州和德轻量化成型技术有限公司 | Vertical indirect extrusion casting device for vacuum pump rotor and preparation method thereof |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140430 |
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| RJ01 | Rejection of invention patent application after publication |