CN103528947B - A kind of method for quick of polyurethane wire enamel film state of cure - Google Patents
A kind of method for quick of polyurethane wire enamel film state of cure Download PDFInfo
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Abstract
The invention discloses a kind of method for quick of polyurethane wire enamel film state of cure, it mainly adopts extensometer or tension tester that the alignment sample of extraction is stretched to conductor break point respectively, measure the distance of obviously turning white to breakpoint from paint film color, two are had no progeny turn white distance values be added, thus obtain the total length breaking rear laccase prodution, and institute's value and critical field numeric ratio pair will be measured, judge the state of cure of paint film; For exceeding table of comparisons point of interruption place, the criterion of detection method turns white that to be judged to film curing degree not enough for length range, be less than table of comparisons point of interruption place and turn white that to be judged to film curing degree excessive for long scope.Detection method of the present invention utilizes elongation breakpoint place enameled wire to turn white length can be quantitative, polyurethane wire enamel film state of cure can be judged intuitively, can the state of cure of convenient, fast and accurate judgement enameled wire coat, save detection time and testing cost, substantially increase the efficiency of detection.
Description
Technical field
The present invention relates to a kind of detection method, particularly relate to a kind of method for quick of polyurethane wire enamel film state of cure.
Background technology
Enameled wire refers to that also claim electromagnetic wire, be a principal item of winding wire, be made up of conductor and insulation course two, bare wire after annealing softening, then through repeatedly painting, curing and forming with insullac as insulating coating, plain conductor for coiling solenoid.Enameled wire is the main and key raw material of motor, electrical equipment and household electrical appliance, telecommunication, electronic instrument electromagnetism winding.Polyurethane enamelled wire because of its there is easy coloring, high frequency performance is good, heat resistance is good, the premium properties such as easy scolding tin, particularly scolding tin performance, is more applicable in modernization industrial mass manufacture, polyurethane enamelled wire consumption cumulative year after year.
Polyurethane enamelled wire is produced based on conductor true qualities, paint film water white transparency, responsive especially to solidification temperature when producing, be easy to occur solidification deficiency and over cure (paint film burns and flies), and the elasticity of curing process and enameled wire coat, the tack of paint film, the proof voltage of paint film, the softening breakdown of paint film, the thermal impact of paint film etc. have substantial connection, as long as ensure that the state of cure of paint film is in the scope that certain is determined, just can ensure that these performances of enameled wire can be qualified.
Paint film due to enameled wire had both required good mechanical property and heat resistance (as scratch resistance, resistance to softening punctures), and require again good elasticity (as elasticity, thermal shock etc.), this just determines the performance that enameled wire coat must have rigid flexible system.This performance realizes by adjusting its chemical constitution and controlling suitable state of cure.
Film curing forming process is that wire enamel base resin forms the superpolymer production run of solidification through crosslinked or closed loop chemical reaction.The crosslinking curing of appropriateness, the physical strength that can improve paint film can improve elasticity again, has not only been conducive to the effect that rigid structure factor plays a role but also fully can show flexible structure factor.If but over cure, paint film can become fragile, and causes the poor flexibility of paint film, when the strand of conductor-stretch to paint film time a certain amount of can rupture.Because its insulating property of paint film molecular chain rupture lose, if make motor, easily there is the problems such as burning machine or short circuit; If simultaneously because polyurethane enamelled wire solidification is not enough, paint film internal solvent then has remnants, there will be voltage drop, cause electric motor short circuit after placing a period of time.
The mode of conventional sense polyurethane wire enamel film state of cure has: 1, soften and puncture; 2, dielectric loss.Adopt and softening puncture detection, when film curing serious excessively time can obviously detect, but whether moderate or occur that slight deficiency to make accurate judgement to film curing degree.
Patent CN101424649A discloses a kind of employing dielectric loss detection method, by the state of cure adopting the curvilinear motion of TG Δ to reflect enameled wire intuitively, and adjusting furnace temperature can be carried out according to the change of curve and bake and bank up with earth the time, enameled wire coat state of cure is made to reach optimum condition, the effective product quality controlling enameled wire.But it is expensive to there is dielectric loss checkout equipment in existing invention, the problems such as measuring accuracy difference, dielectric loss value is tested out on the low side when film curing deficiency or the over cure of polyurethane enamelled wire, very accurately can not judge the state of cure of paint film, often be in during judgement specious, be difficult to the state of drawing a conclusion, there is limitation to a certain degree in the judgement of test findings.
Therefore find a kind of cost low, the method for convenient, fast, accurate judgement enameled wire coat state of cure, to the operation instruction of enameled wire and application, there is practical significance.
Summary of the invention
The object of the present invention is to provide a kind of method for quick of polyurethane wire enamel film state of cure, the method can the state of cure of convenient, fast and accurate judgement enameled wire coat, saves detection time and testing cost, greatly improves the efficiency of detection.
A method for quick for polyurethane wire enamel film state of cure, its concrete steps are as follows:
Step 1, get with batch, three samples of same specification, same model polyurethane enamelled wire, alignment;
Step 2, is stretched to conductor break point respectively by got alignment sample;
Step 3, measures the distance of obviously turning white to breakpoint from paint film color, and distance values addition of turning white of having no progeny two, obtains the total length breaking rear laccase prodution;
Step 4, will measure institute's value and critical field numeric ratio pair, judge the state of cure of paint film.
In detection method step 1 of the present invention, three samples are the polyurethane enamelled wire of same batch, and its nominal diameter scope is 0.100-1.600mm, are preferably 0.100-0.400mm, 0.400-0.800mm or 0.800-1.600mm.
The thermal level grade of polyurethane enamelled wire of the present invention is one or more in 130,155 or 180, is more preferably 155.
When detection method step 1 of the present invention is specially and takes off the enameled wire of test from the enameled wire spool of good packaging, the enameled wire sample got must not bear tension force or unnecessary bending.
Detection method step 1 of the present invention should remove enough lines, to ensure that the enameled wire damaged do not carried secretly by sample before also comprising each test.
Checkout equipment in detection method step 2 of the present invention is the one in extensometer or tension tester.
In detection method step 2 of the present invention, draw speed is preferably (5 ± 2) mm/s, is more preferably (5 ± 1) mm/s.
In detection method step 2 of the present invention, the free testing length of alignment sample is preferably 150mm-300mm, is more preferably 200-250mm.
Obviously turn white place for aliging with root breakpoint place after sample fracture in detection method step 3 of the present invention, check the paint film color change of breakpoint place under fluorescent light, because breakpoint place paint film throws off copper conductor, under the refraction of light, shoal compared with paint film normal color, turn white.
The state of cure of the judgement paint film described in detection method of the present invention according to also comprising that nominal diameter is same batch of 0.100-1.600mm, the sample measurement numerical value of same specification, same model is greater than the turn white scope of total length of corresponding breakpoint place in contrast list and is then judged as that film curing degree is not enough, be less than the turn white scope of total length of corresponding breakpoint place in contrast list and be then judged as that film curing degree is excessive.
The state of cure of judgement paint film of the present invention according to comprising: nominal diameter is same batch of 0.100-1.600mm, at least two samples meet contrast list point of interruption place and to turn white the scope of total length in three sample measurement numerical value of same specification, same model, then state of cure meets the requirements.
Basis for estimation of the present invention is specifically as shown in table 1.
Table 1, turn white the length standard scope table of comparisons for the nominal diameter scope of polyurethane enamelled wire and breakpoint place
Turn white length range for the breakpoint place of the polyurethane wire enamel film described in table 1 table of comparisons of the present invention, be according to softening puncture and medium loss test measures the state of cure of polyurethane wire enamel film time enameled wire breakpoint place to turn white length gained, its length of can turning white as breakpoint place during standard cure degree.
Known by experiment:
1) when the solidification of polyurethane wire enamel film is normal, paint film has sufficient toughness, and tack is good, and distance of turning white after polyurethane enamelled wire tension failure is within the scope of table size, extends de-length of tube and belongs to state of cure optimum range.
2) during polyurethane wire enamel film over cure, paint film becomes fragile, the poor flexibility of paint film.When the strand of conductor-stretch to paint film time a certain amount of can rupture, the paint film of molecular chain rupture still can be attached on conductor or paint film and conductor have trace " de-manage ".
3) when the solidification of polyurethane wire enamel film is not enough, paint film tack is poor, when after polyurethane wire enamel film tension failure, more serious paint film occurs and conductor " takes off and manage " phenomenon, causes turning white apart from longer.
When above-described " de-pipe " phenomenon refers to and carries out tension test to sample, on extensometer or tension tester, with certain speed, pulling force is applied to sample, in drawing process at a slow speed, paint film and the effect of conductor under tension start to extend, when conductor extends to critical point, there is knick point, but when also not breaking, paint film disconnects at knick point place, along with conductor continues to extend, because the adhesion of knick point place paint film and conductor is less than pulling force, knick point place paint film loses tack, to breakaway poing retraction in the other direction, namely occurs " de-pipe " phenomenon.
Detection method of the present invention has following advantage or beneficial effect: utilizing elongation breakpoint place enameled wire to turn white length can be quantitative, polyurethane wire enamel film state of cure can be judged intuitively, compared with prior art can more convenient, the state of cure that judges enameled wire coat fast, accurately, save detection time and testing cost, improve the efficiency detected.
Specific embodiment
Embodiment 1
The method for quick of 155 level polyurethane enamelled wire film curing degree, concrete steps are as follows:
Step 1, extracts three, the same batch of 155 level polyurethane enamelled wire sample that nominal diameter is 0.35mm;
Extract three, the same batch of 155 level polyurethane enamelled wire sample that nominal diameter is 0.55mm;
Extract three, the same batch of 155 level polyurethane enamelled wire sample that nominal diameter is 1.00mm;
The sample that alignment is extracted;
The sample extracted is do not bear tension force, bending and carry the enameled wire damaged secretly.
Step 2, uses cupping machine, with 4.9mm/s, the sample that free testing length is 155mm is stretched to conductor break point.
Step 3, measure the distance of obviously turning white to breakpoint from polyurethane wire enamel film color, the distance values of turning white of having no progeny two is added, and obtaining breaking rear nominal diameter is that the total length that 155 grades of enameled wire coats of 0.35mm turn white is respectively 2.0mm, 2.3mm, 3.0mm; Breaking rear nominal diameter is that the total length that 155 grades of enameled wire coats of 0.55mm turn white is respectively 3.5mm, 4.0mm, 3.8mm; Breaking rear nominal diameter is that the total length that 155 grades of enameled wire coats of 1.00mm turn white is respectively 4.0mm, 4.5mm, 5.0mm.
Step 4, will measure institute's value and numeric ratio pair in table, its result is as shown in table 2.
With reference to GB/T4074.6-2008(winding wire test method the 6th part: thermal behavior) and GB/T6109.10-2008(enamel-cover circle winding wire the 10th part: 155 grades are directly welded polyurethane paint copper round wire), respectively to above-mentioned nominal diameter be 0.35mm, 0.55mm and 1.00mm sample with batch 155 level polyurethane enamelled wire paint film samples, carry out softening puncturing with dielectric loss test that (dielectric loss value is tested by medium loss test instrument and obtains, value when it is insullac the best state of cure), record numerical value as shown in table 2.
Table 2, adopt softening to puncture, dielectric loss value and the breakpoint place length standard that turns white detects 155 level polyurethane enamelled wire film curing degree contrasts
155 level polyurethane enamelled wire nominal diameters are that the breakpoint place of 0.35mm, 0.55mm and 1.00mm length of turning white is turned white within the scope of length standard at breakpoint place; From the testing result of three groups of samples, detection method judges qualified.
Through the contrast of three kinds of method of testings, breakpoint place length of turning white judges that the result that film curing degree punctures with softening, dielectric loss method judges conforms to.
Embodiment 2
The method for quick of 130 level polyurethane enamelled wire film curing degree, concrete steps are as follows:
Step 1, extracts three, the same batch of 130 level polyurethane enamelled wire sample that nominal diameter is 0.25mm;
Extract three, the same batch of 130 level polyurethane enamelled wire sample that nominal diameter is 0.50mm;
Extract three, the same batch of 130 level polyurethane enamelled wire sample that nominal diameter is 0.90mm;
The sample that alignment is extracted;
The sample extracted is do not bear tension force, bending and carry the enameled wire damaged secretly.
Step 2, uses cupping machine, with 5.0mm/s, the sample that free testing length is 190mm is stretched to conductor break point.
Step 3, measure the distance of obviously turning white to breakpoint from polyurethane wire enamel film color, the distance values of turning white of having no progeny two is added, and obtaining breaking rear nominal diameter is that the total length that 130 grades of enameled wire coats of 0.25mm turn white is respectively 2.0mm, 2.8mm, 3.0mm; Breaking rear nominal diameter is that the total length that 130 grades of enameled wire coats of 0.50mm turn white is respectively 3.5mm, 3.0mm, 4.0mm; Breaking rear nominal diameter is that the total length that 130 grades of enameled wire coats of 0.90mm turn white is respectively 5.0mm, 4.0mm, 5.8mm.
Step 4, will measure institute's value and numeric ratio pair in table, its result is as shown in table 3.
With reference to GB/T4074.6-2008(winding wire test method the 6th part: thermal behavior) and GB/T6109.4-2008(enamel-cover circle winding wire the 4th part: 130 grades are directly welded polyurethane paint copper round wire), respectively to above-mentioned nominal diameter be 0.25mm, 0.50mm and 0.90mm sample with batch 130 level polyurethane enamelled wire paint film samples, carry out softening puncturing with dielectric loss test that (dielectric loss value is tested by medium loss test instrument and obtains, value when it is insullac the best state of cure), record numerical value as shown in table 3.
Table 3, adopt softening to puncture, dielectric loss value and the breakpoint place length standard that turns white detects 130 level polyurethane enamelled wire film curing degree contrasts
130 level polyurethane enamelled wire nominal diameters are that the breakpoint place of 0.25mm, 0.50mm and 0.90mm length of turning white is turned white within the scope of length standard at breakpoint place; From the testing result of three groups of samples, detection method judges qualified.
Through the contrast of three kinds of method of testings, breakpoint place length of turning white judges that the result that film curing degree punctures with softening, dielectric loss method judges conforms to.
Embodiment 3
The method for quick of 180 level polyurethane enamelled wire film curing degree, concrete steps are as follows:
Step 1, extracts three, the same batch of 180 level polyurethane enamelled wire sample that nominal diameter is 0.40mm;
Extract three, the same batch of 180 level polyurethane enamelled wire sample that nominal diameter is 0.60mm;
Extract three, the same batch of 180 level polyurethane enamelled wire sample that nominal diameter is 1.20mm;
The sample that alignment is extracted;
The sample extracted is do not bear tension force, bending and carry the enameled wire damaged secretly.
Step 2, uses cupping machine, with 5.1mm/s, the sample that free testing length is 250mm is stretched to conductor break point.
Step 3, measure the distance of obviously turning white to breakpoint from polyurethane wire enamel film color, the distance values of turning white of having no progeny two is added, and obtaining breaking rear nominal diameter is that the total length that 180 grades of enameled wire coats of 0.40mm turn white is respectively 3.0mm, 3.8mm, 2.8mm; Breaking rear nominal diameter is that the total length that 180 grades of enameled wire coats of 0.60mm turn white is respectively 3.9mm, 4.0mm, 4.6mm; Breaking rear nominal diameter is that the total length that 180 grades of enameled wire coats of 1.20mm turn white is respectively 7.0mm, 6.5mm, 5.6mm.
Step 4, will measure institute's value and numeric ratio pair in table, its result is as shown in table 4.
With reference to GB/T4074.6-2008(winding wire test method the 6th part: thermal behavior) and GB/T6109.23-2008(enamel-cover circle winding wire the 23rd part: 180 grades are directly welded polyurethane paint copper round wire), respectively to above-mentioned nominal diameter be 0.40mm, 0.60mm and 1.20mm sample with batch 180 level polyurethane enamelled wire paint film samples, carry out softening test and the dielectric loss of puncturing and test that (dielectric loss value is tested by medium loss test instrument and obtains, value when it is insullac the best state of cure), record numerical value as shown in table 4.
Table 4, adopt softening to puncture, dielectric loss value and the breakpoint place length standard that turns white detects 180 level polyurethane enamelled wire film curing degree contrasts
180 level polyurethane enamelled wire paint film nominal diameters are that the breakpoint place of 0.40mm, 0.60mm and 1.20mm length of turning white is turned white within the scope of length standard at breakpoint place; From the testing result of three groups of samples, detection method judges qualified.
Through the contrast of three kinds of method of testings, breakpoint place length of turning white judges that the result that film curing degree punctures with softening, dielectric loss method judges conforms to.
In addition, it should be noted that, the specific embodiment described in this instructions, its classification, magnitude range, institute's title of being named etc. can be different.All equivalences of doing according to structure, feature and the principle described in inventional idea of the present invention or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from described content of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (8)
1. a method for quick for polyurethane wire enamel film state of cure, is characterized in that, concrete steps are as follows:
Step 1, get with batch, three samples of same specification, same model polyurethane enamelled wire, alignment;
Step 2, is stretched to conductor break point respectively by got alignment sample, and wherein, draw speed is (5 ± 2) mm/s;
Step 3, measures the distance of obviously turning white to breakpoint from paint film color, and distance values addition of turning white of having no progeny two, obtains the total length breaking rear laccase prodution;
Step 4, will measure institute's value and critical field numeric ratio pair, judge the state of cure of paint film.
2. detection method according to claim 1, is characterized in that, described polyurethane enamelled wire sample nominal diameter scope is 0.100-1.600mm.
3. detection method according to claim 2, is characterized in that, described critical field is turn white length standard scope in breakpoint place corresponding within the scope of the nominal diameter of polyurethane enamelled wire, and concrete contrast is listed as follows:
4. detection method according to claim 3, it is characterized in that, the state of cure of described judgement paint film according to comprising: nominal diameter scope is same batch of 0.100-1.600mm, at least two samples meet contrast list point of interruption place and to turn white the scope of total length in three sample measurement numerical value of same specification, same model, then state of cure meets the requirements.
5. detection method according to claim 3, it is characterized in that, the state of cure of described judgement paint film according to also comprising that nominal diameter scope is same batch of 0.100-1.600mm, the sample measurement numerical value of same specification, same model is greater than the turn white scope of total length of corresponding breakpoint place in contrast list and is then judged as that film curing degree is not enough, be less than the turn white scope of total length of corresponding breakpoint place in contrast list and be then judged as that film curing degree is excessive.
6. detection method according to claim 1, is characterized in that, in described step 2, the length of alignment sample is 150mm-300mm.
7. detection method according to claim 1, is characterized in that, the checkout equipment in described step 2 is the one in extensometer or tension tester.
8. detection method according to claim 1, is characterized in that, the thermal level grade of described polyurethane enamelled wire is one or more in 130,155 or 180.
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| CN113916929B (en) * | 2021-09-17 | 2023-04-07 | 东方电气集团东方电机有限公司 | Method for evaluating main insulation curing degree of generator stator bar |
| CN114242346B (en) * | 2021-12-30 | 2022-08-26 | 科城铜业(英德)有限公司 | Method for rapidly determining optimal curing process of polyurethane enameled wire |
| CN114883058B (en) * | 2022-05-07 | 2023-12-01 | 科城铜业(英德)有限公司 | Method for reducing residual organic gas in enameled wire production process |
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