CN105397970A - Automatic control method for material temperature of casting head of polyurethane high-pressure casting machine - Google Patents
Automatic control method for material temperature of casting head of polyurethane high-pressure casting machine Download PDFInfo
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- CN105397970A CN105397970A CN201510930044.9A CN201510930044A CN105397970A CN 105397970 A CN105397970 A CN 105397970A CN 201510930044 A CN201510930044 A CN 201510930044A CN 105397970 A CN105397970 A CN 105397970A
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- temperature
- casting machine
- pouring head
- flow
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Classifications
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- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
Abstract
The invention discloses an automatic control method for the material temperature of a casting head of a polyurethane high-pressure casting machine. According to the method, a PLC program is modified, a plurality of stages of casting head temperature sections are set, different flows can be correspondingly input according to the temperatures of the different sections, and when the casting machine runs, the reasonable flow can be automatically matched according to the real-time temperature, so that the aim of precisely controlling the temperature of the casting head is achieved; and insufficient filling of foaming pieces due to raw material reaction fluctuation is eliminated, and therefore the reject rate and repair rate are lowered.
Description
Technical field
The present invention relates to a kind of polyurethane high pressure casting machine pouring head material temperature autocontrol method.
Background technology
At present, interior trim factory has nine kinds of instrument boards and two kinds of door-plate products to adopt polyurethane foam technique, and casting machine manufacturer has Krauss-maffei, Kang Long, Heneck etc.
Krauss-maffei and Kang Long casting machine mainly contains two temperature controlling points, batch can and measuring pump outlet (hp heat exchanger), and hp heat exchanger place distance pouring head still has the distance of 3-4m, this section is still influenced by ambient temperature, the unrealized direct control to pouring head temperature; And hp heat exchanger affects comparatively large by factors such as cooling water temperature, pipeline build-up of limescale, the Kang Long casting machine pouring head temperature fluctuation that GOLFA6 uses reaches ± and more than 2.5 DEG C, the frequent overtemperature alarm of equipment, needs manually adjustment batch can temperature or circular flow.
The old-fashioned casting machine of the Heneck that AUDIB8 adopts, only has batch can one place temperature controlling point, and pouring head temperature fluctuation reaches ± and more than 2.5 DEG C, and need special messenger's regularly (every 1h) tracking adjustment temperature.
Summary of the invention
The object of the invention is to solve the problem, and a kind of polyurethane high pressure casting machine pouring head material temperature autocontrol method is provided.
Polyurethane semihard foam instrument board relies on the security advantages such as the sense of touch of its high-quality and damping, is widely used in medium-to-high grade automotive field.Its operation principle be polyethers and isocyanates are fully mixed rear injection mould by high pressure casting machine epidermis and skeleton in the middle of, raw material reacts the processing technology forming polyurethane foam in die cavity.
Foaming process is mainly the cross-linking reaction that isocyanates and hydroxy compounds generate carbamate, and isocyanates and water generate the foamable reaction of CO2.Material temperature has very important impact to foamable reaction, when reaction temperature is higher, and raw material reaction rate accelerates in early stage, viscosity increases, accelerate rapidly after fluid ability sharply rises, then contrary when temperature reduces, this therefore material temperature control to be that foamed system controls a very important ring.
Whole foamed system is the enclosed high pressure circulatory system, and high-low pressure cycle alternation carries out.Pressure/flow is higher, raw material and pipeline frictional heat, and pouring head position material temperature can raise gradually; When circulating pressure/flow value is lower or stop production, pouring head position material temperature will be influenced by ambient temperature and reduce.
The present invention is by change PLC program, multiple rank pouring head temperature section is set, the temperature of different section can the different flow of corresponding input, can according to the rational flow of real time temperature Auto-matching when casting machine runs, the object accurately controlling pouring head temperature is reached with this, the foaming piece that solution causes because raw material reaction fluctuates is filled discontented, thus reduce the number of rejects and seconds rate and repair rate.
Step of the present invention is as follows:
1, in the HMI control flow of casting machine, increase human-computer interaction interface, divide several section in interface, each section can arrange different pouring head temperature and flow value according to actual conditions;
2, be equipped with temperature sensor near pouring head, the variate-value detected is transferred to PLC program;
3, in PLC program, increase judges statement, and the temperature value that in this variate-value and HMI being shielded, each section sets is compared and judged, and according to the flow value that the result Auto-matching judged is preset;
4, the output of PLC controls the frequency of frequency converter, thus realizes the control to flow.
Beneficial effect of the present invention:
1, initiative control pouring head temperature, makes material outlet temperature control more accurate, improves the superior property of manufacture process, reduces because material temperature fluctuation causes foaming process to lack the product defectses such as material, hidden hole.
2, traditional control method needs special messenger regularly to adjust parameter with satisfied temperature requirement, and after adopting this control method, the equipment that achieves controls automatically, reduces personnel's load;
3, the method only need change PLC software program, and not needing increases hardware investment.
4, operation strategies is extensive, extends to whole foaming industry; Beneficial effect of the present invention.
Claims (2)
1. a polyurethane high pressure casting machine pouring head material temperature autocontrol method, the method is by change PLC program, multiple rank pouring head temperature section is set, the temperature of different section can the different flow of corresponding input, according to the rational flow of real time temperature Auto-matching, can reach with this object accurately controlling pouring head temperature when casting machine runs.
2. a kind of polyurethane high pressure casting machine pouring head material temperature autocontrol method according to claim 1, the concrete steps of the method are as follows:
(1), in the HMI control flow of casting machine increase human-computer interaction interface, divide several section in interface, each section can arrange different pouring head temperature and flow value according to actual conditions;
(2), near pouring head be equipped with temperature sensor, the variate-value detected is transferred to PLC program;
(3), increase judge statement in PLC program, the temperature value that in this variate-value and HMI being shielded, each section sets is compared and is judged, and the flow value default according to the result Auto-matching of judgement;
(4), the output of PLC controls the frequency of frequency converter, thus realizes the control to flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510930044.9A CN105397970A (en) | 2015-12-14 | 2015-12-14 | Automatic control method for material temperature of casting head of polyurethane high-pressure casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510930044.9A CN105397970A (en) | 2015-12-14 | 2015-12-14 | Automatic control method for material temperature of casting head of polyurethane high-pressure casting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105397970A true CN105397970A (en) | 2016-03-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510930044.9A Pending CN105397970A (en) | 2015-12-14 | 2015-12-14 | Automatic control method for material temperature of casting head of polyurethane high-pressure casting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105397970A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110303631A (en) * | 2019-06-26 | 2019-10-08 | 长虹美菱股份有限公司 | A kind of refrigerator urethane raw temprature control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1591219A1 (en) * | 2003-01-07 | 2005-11-02 | Sunstar Giken Kabushiki Kaisha | One-pack hardening paste material for use in foaming machine |
| CN201380572Y (en) * | 2009-02-18 | 2010-01-13 | 福州福大自动化科技有限公司 | Automatic control system of double-gun and multi-mold station EVA foam molding machine |
| CN201552708U (en) * | 2009-09-30 | 2010-08-18 | 江苏贝德莱特太阳能科技有限公司 | Pouring head of high-pressure polyurethane forming machine |
| CN202517647U (en) * | 2012-03-29 | 2012-11-07 | 浙江领新聚氨酯有限公司 | Constant temperature system for polyurethane foaming machine |
| CN105128250A (en) * | 2015-10-13 | 2015-12-09 | 青岛烨桦塑料设备有限公司 | Control system of super-critical CO2 polypropylene foaming production line |
-
2015
- 2015-12-14 CN CN201510930044.9A patent/CN105397970A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1591219A1 (en) * | 2003-01-07 | 2005-11-02 | Sunstar Giken Kabushiki Kaisha | One-pack hardening paste material for use in foaming machine |
| CN201380572Y (en) * | 2009-02-18 | 2010-01-13 | 福州福大自动化科技有限公司 | Automatic control system of double-gun and multi-mold station EVA foam molding machine |
| CN201552708U (en) * | 2009-09-30 | 2010-08-18 | 江苏贝德莱特太阳能科技有限公司 | Pouring head of high-pressure polyurethane forming machine |
| CN202517647U (en) * | 2012-03-29 | 2012-11-07 | 浙江领新聚氨酯有限公司 | Constant temperature system for polyurethane foaming machine |
| CN105128250A (en) * | 2015-10-13 | 2015-12-09 | 青岛烨桦塑料设备有限公司 | Control system of super-critical CO2 polypropylene foaming production line |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110303631A (en) * | 2019-06-26 | 2019-10-08 | 长虹美菱股份有限公司 | A kind of refrigerator urethane raw temprature control method |
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| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20190104 |
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| AD01 | Patent right deemed abandoned |