CN1143008A - Press mould jet forming method for thermal plastic material - Google Patents
Press mould jet forming method for thermal plastic material Download PDFInfo
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- CN1143008A CN1143008A CN 95107931 CN95107931A CN1143008A CN 1143008 A CN1143008 A CN 1143008A CN 95107931 CN95107931 CN 95107931 CN 95107931 A CN95107931 A CN 95107931A CN 1143008 A CN1143008 A CN 1143008A
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Abstract
In order to provide a kind of thermal plastic material forming technologic process for decreasing the residual strengh and stress in the product and improving the quality of the product, the present invention is provided. It is composed of the following process: (1) first stage compression moulding, locking the upper mould and lower mould and making mould cavity formed by the upper mould and lower mould be larger than the size of the finished product, i.e. precompression volume, (2) first stage injection: injecting the melt raw material about 70% of the finished product in the mould cavity, (3) second stage compression moulding: pressing the upper mould downward until the size of mould cavity equal to the size of finished product, (4) second stage injection: injecting the melt raw material about 30% of the finished product in the mould cavity to make the density of material in mould cavity increase, (5) keeping pressure forming: the material in the cavity is undergone pressure keeping.
Description
The invention belongs to the thermoplastic moulding process, particularly a kind of press mould jet forming method for thermal plastic material.
General thermoplastic ejection formation process is a locked mode, penetrate raw material, pressurize, operations such as die sinking, when penetrating operation, raw material is heated to high temperature earlier, by nozzle the raw material of high temperature melting is injected in the die cavity with high pressure and speed again, shaped article is taken out in die sinking after the pressurize cooling again, residual great internal stress in the product that this forming method is produced, and owing to be to adopt HTHP to inject in the die cavity in the forming process, make the die cavity internal pressure be radial irregular distribution, more cause residual stress and strain increase in the finished product, so can not mold the precision height, the optical mirror slip of thinner thickness and the product of other higher quality.
The purpose of this invention is to provide a kind of pressing mold, ejaculation, again pressing mold, penetrate again, to reduce residual stress strain in the product, to improve the press mould jet forming method for thermal plastic material of product quality.
The present invention is made up of following operation
(1) phase I pressing mold
Upper and lower mould is pinned, and the die cavity that makes upper and lower mould formation is promptly reserved decrement greater than finished size;
(2) phase I is penetrated
The fused raw material that accounts for finished product 70% is injected in the die cavity.
(3) second stage pressing mold
Patrix is pressed to film chamber size equal finished size;
(4) second stage penetrates
The fused raw material that accounts for finished product 30% is injected die cavity once more, make density of material increase in the die cavity;
(5) pressurize moulding
Material pressurize, cooling forming in the die cavity are become product.
The mould that the present invention uses is made up of patrix, middle mould and counterdie, and middle mould slip cap is contained on the patrix, go up, be provided with flexible member between the middle mould, and with the amount of movement of regulating the middle relatively mould of oil hydraulic cylinder stroke adjustment patrix, patrix is provided with upper module; In mould be provided with and the upper module middle die sleeve of fit mutually; Counterdie is provided with corresponding with upper module, middle die sleeve, and with the lower module of its formation die cavity.
Because the present invention is made up of following operation
(1) phase I pressing mold
Upper and lower mould is pinned, and the die cavity that makes upper and lower mould formation is promptly reserved decrement greater than finished size;
(2) phase I is penetrated
The fused raw material that accounts for finished product 70% is injected in the die cavity.
(3) second stage pressing mold
Patrix is pressed to film chamber size equal finished size;
(4) second stage penetrates
The fused raw material that accounts for finished product 30% is injected die cavity once more, make density of material increase in the die cavity;
(5) pressurize moulding
Material pressurize, cooling forming in the die cavity are become product.
The mould that the present invention uses is made up of patrix, middle mould and counterdie, and middle mould slip cap is contained on the patrix, go up, be provided with flexible member between the middle mould, and with the amount of movement of regulating the middle relatively mould of oil hydraulic cylinder stroke adjustment patrix, patrix is provided with upper module; In mould be provided with and the upper module middle die sleeve of fit mutually; Counterdie is provided with corresponding with upper module, middle die sleeve, and with the lower module of its formation die cavity.When penetrating in the phase I, the fused raw material that accounts for finished product 70% is injected in the die cavity, because die cavity greater than finished size, makes the raw material of fusion that excellent flowing be arranged in die cavity, need not too big ejaculation pressure and speed, reduced residual internal stress to a certain extent; When the second stage pressing mold, press mould, the middle relatively mould of its elastic force that overcomes flexible member is moved down, after making die cavity reach finished size, the fused raw material that will account for finished product 30% is again injected in the die cavity, makes density of material increase in the die cavity, improved quality of finished, eliminate internal stress and strain, and unnecessary raw material is pressed into formation overlap in the containing cavity, thereby reach purpose of the present invention.
Fig. 1 is a technological process block-diagram of the present invention.
Fig. 2 is a mould structure constructed profile of the present invention.
Fig. 3 is the first pressing mold stage mould state constructed profile.
Fig. 4 penetrates stage mould state constructed profile in the second pressing mold stage and second.
Fig. 5 be among Fig. 2 A to view.
Below in conjunction with accompanying drawing the present invention is further elaborated.
As shown in Figure 2, the mould that the present invention uses is made up of patrix 1, middle mould 2 and counterdie 3, middle mould 2 slip caps are contained on the patrix 1, upward, be provided with flexible member 4 between the middle mould, and with regulate oil cylinder stroke regulate patrix 1 relatively in the amount of movement of mould 2 promptly reserve decrement S, patrix 1 is provided with upper module 11; In establish on the mould 2 and the upper module 11 middle die sleeve 21 of fit mutually; Counterdie 3 be provided with corresponding with upper module 11, middle die sleeve 21 and with the lower module 31 of its formation die cavity 5.
As shown in Figure 1, the present invention is made up of following operation.
(1) phase I pressing mold
As shown in Figure 3, patrix 1, middle mould 2, counterdie 3 are pinned, be provided with between patrix 1 and the middle mould 2 and reserve decrement S, die cavity 5 sizes that make upper module 11, middle die sleeve 12 and lower module 31 formations are greater than finished size.
(2) phase I is penetrated
The fused raw material that accounts for finished product 70% is injected in the die cavity 5;
(3) second stage pressing mold
As shown in Figure 4, continue to press mould 1, the middle relatively mould 2 of elastic force that makes patrix 1 overcome flexible member 4 moves down the distance that equals to reserve decrement S, and makes mould film 5 sizes equal finished size;
(4) second stage penetrates
The fused raw material that accounts for finished product 30% is injected in the die cavity 5 once more, made density of material increase in the die cavity 5;
(5) pressurize moulding
Material pressurize in the die cavity 5, cooling forming are become product.
As shown in Figure 5, unnecessary material is pressed into capacity chamber 51 through die cavity 5, forms overlap.
Claims (2)
1, a kind of press mould jet forming method for thermal plastic material is characterized in that it is made up of following operation
(1) phase I pressing mold
Upper and lower mould is pinned, and make die cavity that upper and lower mould constitutes, be i.e. decrement in advance greater than finished size;
(2) phase I is penetrated
The fused raw material that accounts for finished product 70% is injected in the die cavity.
(3) second stage pressing mold
Patrix is pressed to film chamber size equal finished size;
(4) second stage penetrates
The fused raw material that accounts for finished product 30% is injected die cavity once more, make density of material increase in the die cavity;
(5) pressurize moulding
Material pressurize, cooling forming in the die cavity are become product.
2, press mould jet forming method for thermal plastic material according to claim 1 is characterized in that described reservation decrement controls with the oil hydraulic cylinder adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95107931 CN1143008A (en) | 1995-08-11 | 1995-08-11 | Press mould jet forming method for thermal plastic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95107931 CN1143008A (en) | 1995-08-11 | 1995-08-11 | Press mould jet forming method for thermal plastic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1143008A true CN1143008A (en) | 1997-02-19 |
Family
ID=5076529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95107931 Pending CN1143008A (en) | 1995-08-11 | 1995-08-11 | Press mould jet forming method for thermal plastic material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1143008A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166806A (en) * | 2010-12-29 | 2011-08-31 | 东莞市南昱树脂五金制品有限公司 | Production technology of anti-yellowing resin imitation diamond with high light transmittance and high weatherability |
| CN103112116A (en) * | 2013-02-03 | 2013-05-22 | 广东安帝斯智能家具组件有限公司 | Machining process and automatic processing equipment for eccentric wheel of furniture connecting piece |
| CN110126173A (en) * | 2019-05-29 | 2019-08-16 | 宁波联大塑料管件有限公司 | It is a kind of for big thickness PE Flange Adaptor Injection Mold tool and a kind of forming method of PE flange |
-
1995
- 1995-08-11 CN CN 95107931 patent/CN1143008A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166806A (en) * | 2010-12-29 | 2011-08-31 | 东莞市南昱树脂五金制品有限公司 | Production technology of anti-yellowing resin imitation diamond with high light transmittance and high weatherability |
| CN103112116A (en) * | 2013-02-03 | 2013-05-22 | 广东安帝斯智能家具组件有限公司 | Machining process and automatic processing equipment for eccentric wheel of furniture connecting piece |
| CN110126173A (en) * | 2019-05-29 | 2019-08-16 | 宁波联大塑料管件有限公司 | It is a kind of for big thickness PE Flange Adaptor Injection Mold tool and a kind of forming method of PE flange |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |