CN102689400B - Forming process for combining PA6T and metal insert - Google Patents
Forming process for combining PA6T and metal insert Download PDFInfo
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- CN102689400B CN102689400B CN201210218054.6A CN201210218054A CN102689400B CN 102689400 B CN102689400 B CN 102689400B CN 201210218054 A CN201210218054 A CN 201210218054A CN 102689400 B CN102689400 B CN 102689400B
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Abstract
The invention discloses a forming process for combining PA6T and a metal insert. The forming process comprises the following steps of: (1) before injection moulding, carrying out pre-heating treatment on the metal insert so as to enable the temperature of the surface of the metal insert to reach 280-360 DEG C; (2) placing the preheated metal insert into a mould to carry out injection moulding so as to enable the temperature of the PA6T material to reach 280-360 DEG C; and (3) keeping the pressure, cooling down and demoulding to obtain the combined PA6T and metal insert. Through the forming process for combining the PA6T and the metal insert, disclosed by the invention, a problem that the metal insert and a plastic assembly are easy to remove under stress after a glass-reinforced plastic combined assembly is formed because the circumference of the metal insert generates overlarge inner stress during forming is solved.
Description
Technical field
The invention belongs to functional high molecule material technical field, be specifically related to a kind of PA6T, be i.e. the moulding process that combines with metal insert of polyamide 6 T.
Background technology
PA6T is a kind of based on terephthalic acid (TPA), and the upgrading nylon 6T of adipic acid and hexamethylene diamine, its fusing point is up to 310 DEG C.The key property of PA6T is excellent high temperature rigid, dimensional stability and chemical-resistant.Excellent characteristic makes PA6T comprise auto parts in a lot of fields, and machine components and electrical/electronic part are widely used.
For many years, the technique that plastic-steel combines is being used always, comprises in injection moulding process and adds metal insert, plastics carry out metal insert and heat the technique such as press-in.Because the form of the combination of metal insert and plastic is varied; current plastic-steel conjunction often there will be plastic and the stressed caducous problem of steel part in shaping or utilization process; shorten the service life of plastic-steel conjunction greatly, also limit the application of plastic-steel conjunction simultaneously.
For this reason, the plastic-steel combined process of we pin PA6T is studied, sum up PA6T and metal insert in conjunction with time a kind of technological standards.
Summary of the invention
The object of the present invention is to provide the moulding process that a kind of PA6T combines with metal insert, this technique can solve metal insert and stressed caducous problem appears in plastic after shaping.
The present invention is achieved by the following technical solutions:
The moulding process that PA6T combines with metal insert, is characterized in that, comprise the steps:
1) before injection mo(u)lding, metal insert is carried out the pre-heat treatment, make metal insert surface temperature reach 280 DEG C-360 DEG C;
2) metal insert after preheating is put into mould and carry out injection moulding, the temperature of PA6T material is 280 DEG C-370 DEG C;
3) pressurize, cooling, the demoulding and get final product.
Described metal insert is steel, copper or aluminium.
Described injection pressure is 60-80MPa
,the pressure of pressurize is 50-70MPa, and the dwell time is 10-15s, and cool time is 25-30s.After pressurize terminates, metal insert surface temperature is 280 DEG C-356 DEG C.
Moulding process of the present invention, before injection mo(u)lding, first by clean for metal insert surface clean, afterwards metal insert is put into high temperature oven to heat, by temperature setting and the observed temperature detection of high temperature oven, management and control is carried out to the metal insert temperature in baking oven, makes metal insert surface temperature reach 280 DEG C-360 DEG C, preferably 310 DEG C-340 DEG C; When the metal insert after preheating put into mould carry out injection moulding time, the temperature of PA6T material is 280 DEG C-360 DEG C, preferably 310 DEG C-340 DEG C, surface contact is carried out with the temperature sensor be contained in mould in metal insert surface, by the temperature sensor in mould, monitor the change of metal insert surface temperature in insert injection moulding process in real time; Then product is prepared at the known injection molding process of employing.
The present invention compared with prior art, has following beneficial effect:
The present invention is by studying technique, sum up PA6T material and metal insert in conjunction with time temperature relation, the surface temperature of metal insert is controlled all the time between 280 DEG C-360 DEG C, the temperature of PA6T material is 280 DEG C-360 DEG C time, plastic-steel combines firm, avoids and produce excessive internal stress around metal insert and cause plastic-steel conjunction to occur metal insert and the stressed caducous problem of plastic after shaping when shaping.
Accompanying drawing explanation
Fig. 1 is plastic-steel composition surface viscous force method of testing schematic diagram
Fig. 2 is the side view of Fig. 1
Fig. 3 is the top view of Fig. 1
1, metal insert 2, plastic 3, fixed position 4, thrust direction.
Detailed description of the invention
Further illustrate the present invention below by detailed description of the invention, following examples are the present invention's preferably embodiment, but embodiments of the present invention are not by the restriction of following embodiment.
Plastic-steel faying face of the present invention is that semicircle engages, and the radius R of metal insert is 45mm, is highly 85mm, and the outermost radius R of plastic is 80mm, is highly 55mm.Before injection mo(u)lding, the P20 metal insert surface clean by surface roughness being Ra0.05 is clean, metal insert is put into high temperature oven heat, by temperature setting and the observed temperature detection of high temperature oven, carry out management and control to the metal insert temperature in baking oven, metal insert surface temperature is as shown in table 1; When the metal insert after preheating put into mould carry out injection moulding time, surface contact is carried out with the temperature sensor be contained in mould in metal insert surface, by the temperature sensor in mould, the in real time change of metallic surface temperature in monitoring insert injection moulding process; Namely last pressurize, cooling, the demoulding obtain product, and during pressurize, the environment temperature in the external world is room temperature, and it is as shown in table 1 that pressurize terminates rear metal insert surface temperature, injection pressure, dwell pressure dwell time, cool time.
Product after shaping is placed 24 hours, allows the crystallization of PA6T and after-contraction reach stable, then plastic-steel conjunction is carried out thrust test.Acquired results is as shown in table 1.
Viscous force method of testing is as follows:
As Figure 1-3, after product after shaping places 24 hours, fixing plastic two ends, then promote by a power perpendicular to metal insert and inserts central plane at the upper and lower side of metal insert, come until metal insert and plastic depart from, in the process promoted the maximum thrust that is separated of plastic, thus the scope of maximum combined power that under drawing different condition, plastic-steel combines.
Table 1
| Metal insert surface temperature (DEG C) | PA6T material temperature (DEG C) | Surface temperature (DEG C) after metal insert pressurize terminates | Molding parameter: injection pressure MPa(P Note), packing pressure MPa(P Protect), dwell time S(S Protect), cool time S(S Cold） | Plastic-steel is in conjunction with maximum thrust (N) | |
| Comparative example 1 | Q=25 | 330 | Q=175 | P Note=63, P Protect=60, S Protect= 10, S Cold=26 | F=7 |
| Comparative example 2 | Q=275 | 320 | Q=297 | P Note=63, P Protect=60, S Protect= 10, S Cold=26 | F=33 |
| Comparative example 3 | Q=250 | 350 | Q=290 | P Note=63, P Protect=60, S Protect= 10, S Cold=26 | F=28 |
| Comparative example 4 | Q=270 | 330 | Q=295 | P Note=63, P Protect=60, S Protect= 10, S Cold=26 | F=29 |
| Comparative example 5 | Q=380 | 370 | Q=372 | P Note=63, P Protect=60, S Protect= 10, S Cold=26 | F=30 |
| Comparative example 6 | Q=450 | 320 | Q=380 | P Note=63, P Protect=60, S Protect= 10, S Cold=26 | F=28 |
| Comparative example 7 | Q=375 | 330 | Q=350 | P Note=63, P Protect=60, S Protect= 10, S Cold=26 | F=43 |
| Comparative example 8 | Q=390 | 320 | Q=351 | P Note=63, P Protect=60, S Protect= 10, S Cold=26 | F=36 |
| Embodiment 1 | Q=280 | 330 | Q=303 | P Note=73, P Protect=65, S Protect= 12, S Cold=28 | F=58 |
| Embodiment 2 | Q=360 | 320 | Q=338 | P Note=73, P Protect=65, S Protect= 12, S Cold=28 | F=56 |
| Embodiment 3 | Q=340 | 280 | Q=307 | P Note=73, P Protect=65, S Protect= 12, S Cold=28 | F=62 |
| Embodiment 4 | Q=350 | 360 | Q=356 | P Note=63, P Protect=65, S Protect= 12, S Cold=28 | F=56 |
| Embodiment 5 | Q=290 | 290 | Q=285 | P Note=73, P Protect=65, S Protect= 12, S Cold=28 | F=55 |
| Embodiment 6 | Q=300 | 300 | Q=297 | P Note=73, P Protect=65, S Protect= 12, S Cold=28 | F=58 |
| Embodiment 7 | Q=310 | 310 | Q=306 | P Note=70, P Protect=60, S Protect= 12, S Cold=25 | F=63 |
| Embodiment 8 | Q=325 | 325 | Q=319 | P Note=68, P Protect=60, S Protect= 13, S Cold=28 | F=69 |
| Embodiment 9 | Q=330 | 330 | Q=325 | P Note=68, P Protect=60, S Protect= 15, S Cold=28 | F=70 |
| Embodiment 10 | Q=340 | 340 | Q=333 | P Note=68, P Protect=60, S Protect= 13, S Cold=28 | F=67 |
As can be seen from the result of above-described embodiment and comparative example, when metal insert surface temperature metal insert surface temperature between 280 DEG C-360 DEG C or in injection moulding process finally reaches between 280 DEG C-360 DEG C, the maximum combined power F > 56N that plastic-steel combines; Metal insert surface temperature remains between 310 DEG C-340 DEG C, the temperature of PA6T material 310 DEG C-340 DEG C time, plastic-steel combine maximum combined power F > 62N.
Claims (6)
1. the moulding process that combines with metal insert of PA6T, is characterized in that, comprise the steps:
1) before injection mo(u)lding, metal insert is carried out the pre-heat treatment, make metal insert surface temperature reach 280 DEG C-360 DEG C;
2) metal insert after preheating is put into mould and carry out injection moulding, the temperature of PA6T material is 280 DEG C-360 DEG C;
3) pressurize, cooling, the demoulding and get final product;
Wherein, after pressurize terminates, metal insert surface temperature is 280 DEG C-356 DEG C.
2. the moulding process that combines with metal insert of PA6T according to claim 1, is characterized in that, step 2) when carrying out injection moulding, metal insert surface temperature is 310 DEG C-340 DEG C, and the temperature of PA6T material is 310 DEG C-340 DEG C.
3. the moulding process that combines with metal insert of PA6T according to claim 1, it is characterized in that, described metal insert is steel, copper or aluminium.
4. the moulding process that combines with metal insert of PA6T according to claim 1, it is characterized in that, described the pre-heat treatment metal insert is put into high temperature oven heat, by temperature setting and the observed temperature detection of high temperature oven, management and control is carried out to the metal insert temperature in baking oven.
5. the moulding process that combines with metal insert of PA6T according to claim 1, it is characterized in that, step 2) in the metal insert after preheating put into mould carry out injection moulding time, surface contact is carried out with the temperature sensor be contained in mould in metal insert surface, in real time the change of monitoring metal insert surface temperature in injection moulding process.
6. the moulding process that combines with metal insert of PA6T according to claim 1, it is characterized in that, described injection pressure is 60-80
mPa,the pressure of pressurize is 50-70
mPa, the dwell time is 10-15s, and cool time is 25-30s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210218054.6A CN102689400B (en) | 2012-06-28 | 2012-06-28 | Forming process for combining PA6T and metal insert |
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| CN201210218054.6A CN102689400B (en) | 2012-06-28 | 2012-06-28 | Forming process for combining PA6T and metal insert |
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| CN102689400B true CN102689400B (en) | 2015-03-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107939A (en) * | 1994-07-21 | 1995-09-06 | 武进县五星农机配件有限公司 | Oil tank, gearbox cover, back head and top head for single-cylinder diesel engine |
| EP1342547A1 (en) * | 2002-03-09 | 2003-09-10 | Demag Ergotech GmbH | Check valve |
| CN1469500A (en) * | 2002-07-17 | 2004-01-21 | 山 黄 | Composite leading and collecting plate for fuel cell and its manufacture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060157891A1 (en) * | 2005-01-14 | 2006-07-20 | Tyco Electronics Corporation | Insert injection-compression molding of polymeric PTC electrical devices |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107939A (en) * | 1994-07-21 | 1995-09-06 | 武进县五星农机配件有限公司 | Oil tank, gearbox cover, back head and top head for single-cylinder diesel engine |
| EP1342547A1 (en) * | 2002-03-09 | 2003-09-10 | Demag Ergotech GmbH | Check valve |
| CN1469500A (en) * | 2002-07-17 | 2004-01-21 | 山 黄 | Composite leading and collecting plate for fuel cell and its manufacture |
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| CN102689400A (en) | 2012-09-26 |
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