CN104552854A - Test method of melt reverse flow in injection molding - Google Patents
Test method of melt reverse flow in injection molding Download PDFInfo
- Publication number
- CN104552854A CN104552854A CN201410786843.9A CN201410786843A CN104552854A CN 104552854 A CN104552854 A CN 104552854A CN 201410786843 A CN201410786843 A CN 201410786843A CN 104552854 A CN104552854 A CN 104552854A
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- China
- Prior art keywords
- curve
- pressure
- injection
- barrel
- pressure curve
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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
- B29C45/76—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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a test method of melt reverse flow in injection molding. The method comprises the following steps: respectively measuring the pressure at a nozzle and the pressure at a cylinder in the injection process to obtain a nozzle pressure curve of the nozzle pressure relative time and a cylinder pressure curve of the cylinder pressure relative time, and then obtaining the cylinder pressure curve beginning from the first intersection of the nozzle pressure curve and the cylinder pressure curve. The melt reverse flow curve (representation) can be obtained through the method disclosed by the invention, the reverse flow stabilities in repeated injections can be compared according to the curve so as to provide evidence for analyzing the influence to product weight repeated precision from different screw head components and different injection processes; and the size and the stability of the reverse flow can be evaluated through the reverse flow curve, and the performance of a non-return valve and the stability of the product weight can be further analyzed.
Description
Technical field
The present invention relates to the method for testing of melt adverse current when a kind of injection mo(u)lding is injected, to obtain the form of expression of melt adverse current.
Background technology
Injection moulding machine is the capital equipment of plastic shaping, along with the fast development of plastic product, to the accuracy of injection moulded products and stability requirement more and more higher, this is also one of main trend of injection moulding machine development.
Action of injection starts, and check ring is in open mode, and screw head melt flows to screw rod, until check ring is completely closed, is referred to as adverse current, and the adverse current that injection starts is the main cause of shot variation.
Different screw arbor assembly structures, different injection pressures, speed, its reflux flow is all different.And injection moulded products under same operating mode, during injection, the stability of adverse current plays a decisive role to product weight repeatable accuracy.And now detection method is lacked for the stability of the form of expression of adverse current in injection process, the size of adverse current and adverse current, puzzlement is caused on the impact of research injection volume on product weight repeatable accuracy, puzzlement is caused to the optimization of screw head assembly and design.
Summary of the invention
Technical problem to be solved by this invention be propose for above-mentioned prior art present situation that a kind of structure is simple, easy to operate, measurement data injection mo(u)lding accurately injection time melt adverse current method of testing, it can accurately obtain adverse current curve.
The present invention solves the problems of the technologies described above adopted technical scheme: the method for testing of melt adverse current during injection mo(u)lding injection, the difference pressure at gaging nozzle place and the pressure at machine barrel place in injection moulding process, obtain the nozzle exit pressure curve of nozzle exit pressure relative time and the barrel pressure curve of barrel pressure relative time, and obtain the barrel pressure curve from nozzle exit pressure curve and barrel pressure curve at first point of intersection.
Above-mentioned barrel pressure curve is by obtaining with lower device: on nozzle and machine barrel, install melt force sensor, and be connected with pressure sensor by injection machine data collecting system, the force value that Real-time Collection sensor detects, obtain nozzle exit pressure curve and barrel pressure curve, then cut the barrel pressure curve after from injection, namely obtain melt adverse current curve.
Compared with prior art, the invention has the advantages that: the curve (form of expression) that can be obtained melt adverse current by the present invention, adverse current stability when can contrast multiple injection according to this curve, for analyzing different screw head assembly and the impact of different injection technique on product weight repeatable accuracy provides foundation; By the size of adverse current curve evaluation adverse current and stability, and the performance of check ring and the stability of product weight can also be analyzed further.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention nozzle and barrel pressure pressure measurement point diagram.
Fig. 2 is embodiment of the present invention injection process nozzle and barrel pressure curve map.
Fig. 3 is the adverse current curve map of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the invention will be further described.
During injection mo(u)lding injection, nozzle exit pressure and barrel pressure pressure tap as shown in Figure 1, install two pressure sensors, front barrel one, machine barrel one, the pressure sensor gaging nozzle pressure of front barrel, and barrel pressure measured by the pressure sensor of machine barrel.
Consider the stroke of screw rod storing, the machine barrel pressure tap of the present embodiment is placed in machine barrel the 3rd hole.
As shown in Figure 2, in injection moulding process, obtain corresponding injection process nozzle and barrel pressure curve map according to time and the corresponding nozzle exit pressure collected and barrel pressure, what wherein II line segment represented is barrel pressure curve, and what I line segment represented is nozzle exit pressure curve.
There is an intersection point barrel pressure curve and nozzle exit pressure curve front portion, and this is belligerent is also injection starting point, and the barrel pressure curve terminated to injection from injection starting point, is referred to as adverse current curve, sees Fig. 3.
As can be seen from adverse current curve, adverse current curve can form a triangle, and the height on this leg-of-mutton area, summit, position are all the indexs of adverse current.Research shows that adverse current curve waveform is stablized, and adverse current is also just stable, and triangle diminishes, and adverse current also just diminishes thereupon.
Claims (2)
1. the method for testing of melt adverse current when injection mo(u)lding is injected, it is characterized in that: the difference pressure at gaging nozzle place and the pressure at machine barrel place in injection moulding process, obtain the nozzle exit pressure curve of nozzle exit pressure relative time and the barrel pressure curve of barrel pressure relative time, and obtain the barrel pressure curve from nozzle exit pressure curve and barrel pressure curve at first point of intersection.
2. the method for testing of melt adverse current when injection mo(u)lding as claimed in claim 1 is injected, it is characterized in that: described barrel pressure curve is by obtaining with lower device: on nozzle and machine barrel, install melt force sensor, and be connected with pressure sensor by injection machine data collecting system, the force value that Real-time Collection sensor detects, obtain nozzle exit pressure curve and barrel pressure curve, then cut the barrel pressure curve after from injection, namely obtain melt adverse current curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410786843.9A CN104552854A (en) | 2014-12-18 | 2014-12-18 | Test method of melt reverse flow in injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410786843.9A CN104552854A (en) | 2014-12-18 | 2014-12-18 | Test method of melt reverse flow in injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104552854A true CN104552854A (en) | 2015-04-29 |
Family
ID=53070418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410786843.9A Pending CN104552854A (en) | 2014-12-18 | 2014-12-18 | Test method of melt reverse flow in injection molding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104552854A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6268722A (en) * | 1985-09-20 | 1987-03-28 | Toshiba Mach Co Ltd | Injection and compression molding |
| EP0718488A1 (en) * | 1994-12-21 | 1996-06-26 | Toyota Jidosha Kabushiki Kaisha | Fuel injection pump for diesel engine |
| CN101612783A (en) * | 2009-06-25 | 2009-12-30 | 无锡威锐科智能测控技术有限公司 | Method for controlling mold cavity resin pressure of injection molding machine |
| CN102642286A (en) * | 2012-05-17 | 2012-08-22 | 北京化工大学 | Fully-electric ultra-high speed injection molding PVT (Pressure Volume Temperature) online measurement and control method |
-
2014
- 2014-12-18 CN CN201410786843.9A patent/CN104552854A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6268722A (en) * | 1985-09-20 | 1987-03-28 | Toshiba Mach Co Ltd | Injection and compression molding |
| EP0718488A1 (en) * | 1994-12-21 | 1996-06-26 | Toyota Jidosha Kabushiki Kaisha | Fuel injection pump for diesel engine |
| CN101612783A (en) * | 2009-06-25 | 2009-12-30 | 无锡威锐科智能测控技术有限公司 | Method for controlling mold cavity resin pressure of injection molding machine |
| CN102642286A (en) * | 2012-05-17 | 2012-08-22 | 北京化工大学 | Fully-electric ultra-high speed injection molding PVT (Pressure Volume Temperature) online measurement and control method |
Non-Patent Citations (2)
| Title |
|---|
| 李海梅；高峰；申长雨: "塑料成型加工实用技术讲座(第三讲) 注射成型工艺对制品质量的影响", 《工程塑料应用》 * |
| 韩雪峰: "螺杆头组件及注塑工艺对制品重量重复精度影响的研究", 《北京化工大学硕士学位论文》 * |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |