CN111941724A - Injection molding process for optimized flash of toilet cover of intelligent toilet - Google Patents
Injection molding process for optimized flash of toilet cover of intelligent toilet Download PDFInfo
- Publication number
- CN111941724A CN111941724A CN202010721733.XA CN202010721733A CN111941724A CN 111941724 A CN111941724 A CN 111941724A CN 202010721733 A CN202010721733 A CN 202010721733A CN 111941724 A CN111941724 A CN 111941724A
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- CN
- China
- Prior art keywords
- injection
- pressure
- pressure maintaining
- injection molding
- flash
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- 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
- B29C45/03—Injection moulding apparatus
-
- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76595—Velocity
Abstract
The invention discloses an injection molding process for optimizing flash of an intelligent closestool cover, which is characterized by comprising the following steps of: injecting the molten feed liquid to be injected into an injection mold through a nozzle, then maintaining the pressure, and finally cooling and demolding to obtain the intelligent closestool cover; when switching between the steps of injection and pressure maintaining, the feed liquid in the injection mold is just in a full-filling state, and no flash is generated; the pressure maintaining step consists of a plurality of pressure maintaining stages; when pressure maintaining is carried out, the pressure maintaining pressure of the first section is smaller than that of the second section, so that the plastic in the mold cavity is prevented from flowing back; keeping the pressure maintaining speed to be zero, enabling the feed liquid in the die cavity not to advance and to be stopped at the parting surfaces of a movable die and a fixed die of the injection mold, and cooling the feed liquid into a colloidal solid state; and then carrying out the last sections of pressure maintaining until the product is fully filled. The method optimizes the product flash through simple implementation steps, avoids the problem of repairing small gaps caused by manual flash repair, effectively improves the product quality and reduces the labor cost.
Description
Technical Field
The invention relates to an injection molding process for optimizing flash of an intelligent closestool cover, and belongs to the technical field of injection molding.
Background
The flash is also called as flash, burr, etc., and mostly occurs at the parting and joining position of the mold, such as the parting surface of the movable mold and the fixed mold. In general, it is impossible to produce a plastic part without flashing due to various factors.
In recent years, intelligent toilet seats have been developed rapidly, people no longer meet the use functions of the intelligent toilet seats, and the requirements on the appearances of the intelligent toilet seats are higher and higher. The toilet cover is an appearance piece of the intelligent toilet and directly influences the attractiveness of the whole machine. Because the injection molding process of the toilet cover has certain defects in actual production, most of the toilet covers have the problem of flash, many of the flash are repaired manually, small gaps are easily repaired, the appearance is affected, and the labor cost is increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to reduce the generation of flash for the intelligent closestool cover after injection molding.
In order to solve the technical problem, the technical scheme of the invention is to provide an injection molding process for optimizing flash of an intelligent closestool cover, which is characterized by comprising the following steps of: injecting the molten feed liquid to be injected into an injection mold through a nozzle, then maintaining the pressure, and finally cooling and demolding to obtain the intelligent closestool cover;
when switching between the steps of injection and pressure maintaining, the feed liquid in the injection mold is just in a full-filling state, and no flash is generated;
the pressure maintaining step consists of a plurality of pressure maintaining stages; when pressure maintaining is carried out, the pressure maintaining pressure of the first section is smaller than that of the second section, so that the plastic in the mold cavity is prevented from flowing back; keeping the pressure maintaining speed to be zero, enabling the feed liquid in the die cavity not to advance and to be stopped at the parting surfaces of a movable die and a fixed die of the injection mold, and cooling the feed liquid into a colloidal solid state; and then carrying out the last sections of pressure maintaining until the product is fully filled.
Preferably, the first section has a packing pressure half of the packing pressure of the second section.
Preferably, said injecting step consists of a plurality of phases; during injection, the first stage is injected into 15 +/-5% of the product volume, the injection pressure is 100 +/-5 bar, and the injection speed is 112 +/-5 g/s; in the second stage, the injection pressure is (110 +/-5) bar, and the injection speed is (240 +/-5) g/s according to (85 +/-5)% of the volume of the product; the third stage is injecting 99% of the product volume, the injection pressure is (90 + -5) bar and the injection speed is (90 + -5) g/s.
Preferably, the plurality of pressure holding stages in the pressure holding step are respectively: the first section has the pressure maintaining pressure of (15 +/-5) bar, the speed of 0g/s and the time of (3 +/-1) seconds; the second section has the pressure maintaining pressure of (30 +/-5) bar, the speed of (10 +/-2) g/s and the time of (5 +/-1) seconds; the pressure maintaining pressure of the third section is (40 +/-5) bar, the speed is (15 +/-2) g/s, and the time is (25 +/-2) seconds; the pressure of the fourth section is (30 +/-5) bar, the speed is (10 +/-2) g/s, and the time is (3 +/-1) seconds.
Preferably, the cooling step is natural cooling for a time (25 ± 2) s.
Preferably, before said injecting step, the following steps are included:
1) drying the injection molding raw material for 4 hours by using an oven at 85 ℃;
2) preheating the injection molding system and the injection mold;
3) and adding the preheated injection molding raw material into an injection molding system, heating to a molten state, and injecting the feed liquid of the molten injection molding raw material into an injection mold through a nozzle.
Preferably, the injection molding raw material is PP plastic.
The differences between the present invention and the prior art are as follows:
1. the original switching position of injection and pressure maintaining is changed from about 95 percent to 99 percent, namely the product is directly filled in a die cavity of the product in an injection mode, but the state of flash cannot occur, and the field debugging is easy to realize;
2. the injection enters a pressure maintaining stage after the injection is finished, the pressure maintaining stage generally comprises a plurality of stages, one stage is added at the foremost end of the original pressure maintaining stage, and the stage is characterized in that:
pressure maintaining: the pressure is less than the original first pressure maintaining pressure, so as to ensure that the plastic in the mold cavity does not flow back;
pressure maintaining speed: setting the plastic in the mold cavity to zero to prevent the plastic from moving forward; until the plastic cools to a gelatinous solid state.
Compared with the prior art, the invention has the beneficial effects that:
the invention directly fills the product in the injection section, but the state of flash can not be generated, at the moment, the injection section is switched to the first pressure maintaining section, the pressure maintaining pressure is set to be small, the plastic in the die cavity is ensured not to flow back, the pressure maintaining speed is set to be zero, the plastic in the die cavity is enabled not to advance, the pressure is maintained for a period of time in the state, the plastic is enabled to be stopped at the forefront edge of the product, namely the parting surface of the movable die and the fixed die, and the plastic meets the iron material of the die and is rapidly cooled into a. Then setting the last sections for pressure maintaining, and fully beating the product. The process method utilizes the plastic at the parting surface to be cooled and solidified in advance, and reduces the generation of flash.
The method optimizes the product flash through simple implementation steps, avoids the problem of repairing small gaps caused by manual flash repair, effectively improves the product quality and reduces the labor cost.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below.
Example 1
The invention provides an injection molding process for optimizing flash of an intelligent closestool cover, which comprises the following steps:
before injection molding:
1. drying the PP plastic for 4 hours by using an oven at 85 ℃;
2. preheating an injection molding system (in the embodiment, the injection molding system is Martian MA7000) and an injection mold;
3. adding the preheated PP plastic into an injection molding system, heating to a molten state, and injecting the molten PP plastic into an injection mold through a nozzle;
and (3) injection:
the injection pressure in the first stage is 15% of the product volume, the injection pressure is 100bar, and the injection speed is 112 g/s; in the second stage, the product is injected to 85% of the volume, the injection pressure is 110bar, and the injection speed is 240 g/s; in the third stage, 99% of the product volume is injected, the injection pressure is 90bar, and the injection speed is 90 g/s;
pressure maintaining:
the first section of pressure maintaining pressure is 15bar, the speed is 0g/s, the time is 2 seconds, the plastic in the die cavity does not flow back and does not move forward, the plastic stops at the forefront of a product, namely the parting surface of the movable die and the fixed die, and the plastic is rapidly cooled into a colloidal solid state when meeting iron; (this state is such that in the latter few dwell times, the leading edge of the product is not crossed and flash is produced because the gelatinous solid plastic in the mould cavity is not liquid.)
The second section has the pressure maintaining pressure of 30bar, the speed of 10g/s and the time of 5 seconds;
the pressure maintaining pressure of the third section is 40bar, the speed is 15g/s, and the time is 25 seconds;
the pressure of the fourth section is 30bar, the speed is 10g/s, and the time is 2 seconds;
and (4) after the product is fully beaten, naturally cooling for 25s, and demolding to obtain the intelligent closestool cover.
Example 2
In the present embodiment, during injection, 10% of the product volume is injected in the first stage, the injection pressure is 95) bar, and the injection speed is 107 g/s; the second stage is injecting 80% of the product volume, the injection pressure is 105bar, and the injection speed is 235 g/s; the third stage was carried out at an injection pressure of 85bar and an injection rate of 85g/s to a product volume of 99%.
The first section of pressure maintaining pressure is 10bar, the speed is 0g/s, and the time is 3 seconds; the second section has the pressure maintaining pressure of 25bar, the speed of 8g/s and the time of 4 seconds; the pressure maintaining pressure of the third section is 35bar, the speed is 13g/s, and the time is 23 seconds; the pressure of the fourth stage was 25bar, the speed 8g/s and the time 3 seconds.
The cooling step is natural cooling for 23 s.
The rest is the same as in example 1.
Example 3
In this example, during injection, the first stage is injected at 20% of the product volume, the injection pressure is 105bar and the injection speed is 117 g/s; the injection pressure is 115bar, and the injection speed is 245 g/s; the third stage was carried out at an injection pressure of 95bar and an injection rate of 95g/s to 99% of the product volume.
The first section has the pressure of 20bar, the speed of 0g/s and the time of 4 seconds; the second section has the pressure maintaining pressure of 35bar, the speed of 12g/s and the time of 6 seconds; the pressure maintaining pressure of the third section is 45bar, the speed is 17g/s, and the time is 27 seconds; the pressure at the fourth stage was 35bar, at a rate of 12g/s and for a period of 4 seconds.
The cooling step is natural cooling for 27 s.
The rest is the same as in example 1.
Claims (7)
1. The injection molding process for optimizing the flash of the toilet cover of the intelligent toilet is characterized by comprising the following steps of: injecting the molten feed liquid to be injected into an injection mold through a nozzle, then maintaining the pressure, and finally cooling and demolding to obtain the intelligent closestool cover;
when switching between the steps of injection and pressure maintaining, the feed liquid in the injection mold is just in a full-filling state, and no flash is generated;
the pressure maintaining step consists of a plurality of pressure maintaining stages; when pressure maintaining is carried out, the pressure maintaining pressure of the first section is smaller than that of the second section, so that the plastic in the mold cavity is prevented from flowing back; the pressure maintaining speed of the first section is zero, so that the feed liquid in the die cavity does not move forward and stays at the parting surfaces of a movable die and a fixed die of the injection die, and is cooled into a colloidal solid state; and then carrying out the last sections of pressure maintaining until the product is fully filled.
2. The optimized flash injection molding process for the toilet cover of the intelligent toilet as claimed in claim 1, wherein the first section has a half of the second section's holding pressure during holding.
3. The injection molding process for optimizing flash of a toilet cover of an intelligent toilet as claimed in claim 1, wherein the injection step consists of a plurality of stages; during injection, the first stage is injected into 15 +/-5% of the product volume, the injection pressure is 100 +/-5 bar, and the injection speed is 112 +/-5 g/s; in the second stage, the injection pressure is (110 +/-5) bar, and the injection speed is (240 +/-5) g/s according to (85 +/-5)% of the volume of the product; the third stage is injecting 99% of the product volume, the injection pressure is (90 + -5) bar and the injection speed is (90 + -5) g/s.
4. The injection molding process of the optimized flash of the toilet cover of the intelligent toilet as claimed in claim 1, wherein the plurality of pressure maintaining stages in the pressure maintaining step are respectively: the first section has the pressure maintaining pressure of (15 +/-5) bar, the speed of 0g/s and the time of (3 +/-1) seconds; the second section has the pressure maintaining pressure of (30 +/-5) bar, the speed of (10 +/-2) g/s and the time of (5 +/-1) seconds; the pressure maintaining pressure of the third section is (40 +/-5) bar, the speed is (15 +/-2) g/s, and the time is (25 +/-2) seconds; the pressure of the fourth section is (30 +/-5) bar, the speed is (10 +/-2) g/s, and the time is (3 +/-1) seconds.
5. An injection molding process for optimizing flash of a toilet cover of an intelligent toilet as claimed in claim 1, wherein the cooling step is natural cooling for 25 ± 2 s.
6. An injection molding process for optimizing flash of a toilet cover of an intelligent toilet as claimed in claim 1, wherein before the injection step, the injection molding process comprises the following steps:
1) drying the injection molding raw material for 4 hours by using an oven at 85 ℃;
2) preheating the injection molding system and the injection mold;
3) and adding the preheated injection molding raw material into an injection molding system, heating to a molten state, and injecting the feed liquid of the molten injection molding raw material into an injection mold through a nozzle.
7. The injection molding process of the optimized flash of the intelligent closestool cover as claimed in claim 6, wherein the injection molding raw material is PP plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010721733.XA CN111941724A (en) | 2020-07-24 | 2020-07-24 | Injection molding process for optimized flash of toilet cover of intelligent toilet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010721733.XA CN111941724A (en) | 2020-07-24 | 2020-07-24 | Injection molding process for optimized flash of toilet cover of intelligent toilet |
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| CN111941724A true CN111941724A (en) | 2020-11-17 |
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| CN202010721733.XA Pending CN111941724A (en) | 2020-07-24 | 2020-07-24 | Injection molding process for optimized flash of toilet cover of intelligent toilet |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200402357A (en) * | 2002-04-26 | 2004-02-16 | Yasui & Co Ltd M | Injection molding machine for lost wax casting and injection molding method for lost wax casting |
| CN103402732A (en) * | 2011-02-23 | 2013-11-20 | 东洋机械金属株式会社 | Molding condition diagnostic device |
| CN105431274A (en) * | 2013-08-01 | 2016-03-23 | 艾姆弗勒克斯有限公司 | Injection molding machines and methods for accounting for changes in material properties during injection molding runs |
| CN106205321A (en) * | 2016-07-19 | 2016-12-07 | 日进教学器材(昆山)有限公司 | The bone model of foam injection molding and method |
| CN107297856A (en) * | 2017-07-20 | 2017-10-27 | 歌尔股份有限公司 | A kind of flexible glue arch product injection moulding process |
-
2020
- 2020-07-24 CN CN202010721733.XA patent/CN111941724A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200402357A (en) * | 2002-04-26 | 2004-02-16 | Yasui & Co Ltd M | Injection molding machine for lost wax casting and injection molding method for lost wax casting |
| CN103402732A (en) * | 2011-02-23 | 2013-11-20 | 东洋机械金属株式会社 | Molding condition diagnostic device |
| CN105431274A (en) * | 2013-08-01 | 2016-03-23 | 艾姆弗勒克斯有限公司 | Injection molding machines and methods for accounting for changes in material properties during injection molding runs |
| CN106205321A (en) * | 2016-07-19 | 2016-12-07 | 日进教学器材(昆山)有限公司 | The bone model of foam injection molding and method |
| CN107297856A (en) * | 2017-07-20 | 2017-10-27 | 歌尔股份有限公司 | A kind of flexible glue arch product injection moulding process |
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Application publication date: 20201117 |
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