CN106248731B - The method for choosing molding parameters using heat enthalpy value - Google Patents
The method for choosing molding parameters using heat enthalpy value Download PDFInfo
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- CN106248731B CN106248731B CN201610801438.9A CN201610801438A CN106248731B CN 106248731 B CN106248731 B CN 106248731B CN 201610801438 A CN201610801438 A CN 201610801438A CN 106248731 B CN106248731 B CN 106248731B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention discloses the method for choosing molding parameters using heat enthalpy value, the first step, the thermosetting resin in major insulation material is generally single component material, if it is two-component materials it is also contemplated that solidification rate caused by its change of component is different；Second step, obtains the heat enthalpy value curve of the thermosetting resin, and third step carries out integral calculation using computer by heat enthalpy value, obtains under different rates, thermoplasticity conversion ratio and temperature curve；4th step, usually, thermosetting resin solidification temperature is higher, and curing reaction is faster, but is crosslinked not close, will lead to that dielectric strength properties are not high, to be unfavorable for the safe operation of high-voltage motor.Method disclosed by the invention, utilize the heat enthalpy value curve of major insulation material, thermodynamic model by establishing mould pressing process calculates, obtain the mould pressing process time at a temperature of different process, the temperature spot that wherein energy consumption is relatively low is chosen again to be tested, to Optimizing Process Parameters, reduces and wasted on a large amount of major insulation materials and manpower.
Description
Technical field
The invention discloses the methods for choosing molding parameters using heat enthalpy value.
Background technique
Electricity generator stator coil manufacture, is a vital ring in generator production, and the quality of quality directly determines
The service life and stability of generator, therefore, when having variation using novel or major insulation material technology in hot press method,
It requires to re-start die trial pressure, so that it is determined that whether the techniques such as the temperature of molding, clamp time and molding dwell time close
Reason.The mould pressing process manufacturing technology of generator stator bar is one of current mainstream technology, chooses molding parameters in tradition,
It needs largely to be tested and groped, not only wastes a large amount of major insulation material and manpower, also tend to individual because of material
Difference causes the error in judgement in molding parameter；Traditional technology method generally requires thousands of up to a hundred bars, test in batches
Bar performance under different temperature points different time, does so and not only consumes a large amount of man power and material, it is also possible to be molded
It causes to judge on the molding parameters of mistake because of error in the process.
Summary of the invention
The object of the present invention is to provide a kind of methods for choosing molding parameters using heat enthalpy value, utilize major insulation material
Heat enthalpy value curve, by establish mould pressing process thermodynamic model calculate, obtain the mould pressing process at a temperature of different process
Time, then choose the relatively low temperature spot of wherein energy consumption and tested, so that Optimizing Process Parameters, reduce a large amount of major insulation materials
It is wasted on material and manpower.The technical scheme is that the method for choosing molding parameters using heat enthalpy value, it is characterized in that:
The first step is in uncured state, therefore utilizes hot moulding because molding major insulation material contains thermosetting resin up to 37%~40%
Equipment extruding thermosetting resin from major insulation material, temperature should be at 80~90 DEG C when extrusion, and pressure should be in 10t；Second step is adopted
Thermosetting resin is measured in 5 DEG C/min with the heat analysis Differential Scanning Calorimeter of model DSC1,10 DEG C/min and 20 DEG C/min
Lower heat enthalpy value curve, example weight should be somebody's turn to do in 10~30mg, the temperature sensor of heat enthalpy value analytical equipment at 10 Duis or more
The heat enthalpy value curve of thermosetting resin；Third step establishes mathematics using thermokinetics formula da/dt=Aexp (- E/RT) f (a)
Model, in formula, da/dt is reaction rate, and A is frequency factor, and E is reaction activity, and R is gas constant, and T is temperature, f
(a) it is reaction model, obtains the thermoplasticity time at a temperature of the thermosetting resin different process；4th step, in thermosetting resin
Three temperature spots are chosen on the rising temperature curve of heat enthalpy value reaction, the ascending temperature section for being molded thermosetting resin is 100 DEG C
To 180 DEG C, 130 DEG C, 150 DEG C and 170 DEG C three technological parameters are chosen to suppress standard aluminum winding displacement stick, aluminium row is having a size of thickness
21mm, width 51mm, wrapped A layers of half lap is put down B layers wrapped, and length is 1.2 meters, and each molding system 10, soaking time is according to third
The mathematical model of step is calculated as a result, comparing the dielectric strength of aluminium winding displacement stick and energy consumption ratio after molding；5th step, using type
Number for DSC1 heat analysis Differential Scanning Calorimeter simulate molding apparatus work when heating rate and insulating process, the liter of molding apparatus
Warm rate is determined by electrothermal resistance silk, is 1~5 DEG C/min；6th step is tested using the heat analysis Differential Scanning Calorimeter of model DSC1
Glass transition temperature after thermosetting resin thermoplastification；7th step, comparison multiple groups glass transition temperature select its dielectric
Intensity is high, and energy consumption arrives heat enthalpy value molding parameters than relatively low temperature spot.
Present invention substep is described in detail: the first step, and the thermosetting resin in major insulation material is generally single component material, such as
Fruit is that two-component materials are also contemplated that the difference of solidification rate caused by its change of component；Second step obtains the thermosetting resin
Heat enthalpy value curve, as shown in Figure 1；Third step carries out integral calculation using computer by heat enthalpy value, obtains under different rates,
Thermoplasticity conversion ratio and temperature curve, as shown in Figure 2；Using thermokinetics calculate the thermosetting resin chemical activation can with turn
The relation curve of rate, as shown in Figure 3；The thermoplasticity time graph under different equal warm spots is finally calculated, as shown in Figure 4；The
Four steps, usually, thermosetting resin solidification temperature is higher, and curing reaction is faster, but crosslinking is not close, will lead to Jie
Electric strength performance is not high, to be unfavorable for the safe operation of high-voltage motor.
It is of the invention that a kind of method for choosing molding parameters using heat enthalpy value is provided, reduce choose molding parameter this
Material loss in the process effectively improves the molding temperature control of major insulation material, without repeating die work, so that it may
It determines thermal curing time under multiple molding temperatures, working efficiency is effectively promoted.
Detailed description of the invention
Fig. 1 is the heat enthalpy value curve example of the method for the present invention
Fig. 2 is the conversion rate curve example of the method for the present invention
Fig. 3 is the activation energy curve example of the method for the present invention
Fig. 4 is the thermoplasticity time graph example of the method for the present invention
Specific embodiment
The method for choosing molding parameters using heat enthalpy value, it is characterized in that: the first step, because molding major insulation material contains
Thermosetting resin is in uncured state, therefore squeezes out thermosetting from major insulation material using hot moulding equipment up to 37%~40%
Property resin, temperature should be at 80~90 DEG C when extrusion, and pressure should be in 10t；Second step is swept using the heat analysis differential of model DSC1
It retouches instrument and measures thermosetting resin heat enthalpy value curve at 5 DEG C/min, 10 DEG C/min and 20 DEG C/min, example weight should be
10~30mg, the temperature sensor of heat enthalpy value analytical equipment obtain the heat enthalpy value curve of the thermosetting resin at 10 pairs or more；The
Three steps, using thermokinetics formula da/dt=Aexp (- E/RT) f (a) founding mathematical models, in formula, da/dt is reaction speed
Rate, A are frequency factor, and E is reaction activity, and R is gas constant, and T is temperature, and f (a) is reaction model, obtain the thermosetting property
The thermoplasticity time at a temperature of resin different process；4th step, on the rising temperature curve of thermosetting resin heat enthalpy value reaction
Choose three temperature spots, be molded thermosetting resin ascending temperature section be 100 DEG C to 180 DEG C, choose 130 DEG C, 150 DEG C and
170 DEG C of three technological parameters suppress standard aluminum winding displacement stick, and aluminium row is 21mm, width 51mm having a size of thickness, wrapped A layer of half lap is put down
B layers wrapped, length is 1.2 meters, and each molding system 10, soaking time is calculated according to the mathematical model of third step as a result, right
Than the dielectric strength and energy consumption ratio of aluminium winding displacement stick after molding；5th step, using the heat analysis Differential Scanning Calorimeter of model DSC1
Simulation molding apparatus work when heating rate and insulating process, the heating rate of molding apparatus determined by electrothermal resistance silk, be 1~
5℃/min；6th step, the vitrifying after thermosetting resin thermoplastification is tested using the heat analysis Differential Scanning Calorimeter of model DSC1
Transition temperature；7th step, wherein dielectric strength is high for the selection of comparison multiple groups glass transition temperature, consumes energy than relatively low temperature
It puts to get heat enthalpy value molding parameters are arrived.Substep is described in detail: the first step, and the thermosetting resin in major insulation material is general
For single component material, if it is two-component materials it is also contemplated that solidification rate caused by its change of component is different；Second step obtains
The heat enthalpy value curve of the thermosetting resin, as shown in Figure 1；Third step carries out integrating meter using computer by heat enthalpy value curve
Calculation obtains under different rates, thermoplasticity conversion ratio and temperature curve, as shown in Figure 2；The thermosetting property is calculated using thermokinetics
The relation curve of resin chemical activation energy and conversion ratio, as shown in Figure 3；Finally calculate the thermoplasticity time under different equal warm spots
Curve, as shown in Figure 4；4th step, usually, thermosetting resin solidification temperature is higher, and curing reaction is faster, but is crosslinked
It is not close, will lead to that dielectric strength properties are not high, to be unfavorable for the safe operation of high-voltage motor；5th step is for mould
Intend under the technological parameter selected, the heat enthalpy value when solidification of thermosetting resin；6th step tests the thermosetting resin after solidifying
Glass transition temperature, to determine its curing degree；7th step, according to working hour length, energy consumption ratio and performance indicator,
Choose suitable technological parameter.
Claims (1)
1. the method for choosing molding parameters using heat enthalpy value, it is characterized in that: the first step, because molding major insulation material contains heat
Thermosetting resin is in uncured state, therefore utilizes hot moulding equipment extruding thermosetting from major insulation material up to 37%~40%
Resin, temperature should be at 80~90 DEG C when extrusion, and pressure should be in 10t；Second step, using the heat analysis differential scanning of model DSC1
Instrument measures thermosetting resin, and heat enthalpy value curve, example weight should be 10 at 5 DEG C/min, 10 DEG C/min and 20 DEG C/min
~30mg, the temperature sensor of heat enthalpy value analytical equipment obtain the heat enthalpy value curve of the thermosetting resin at 10 pairs or more；Third
Step, using thermokinetics formula da/dt=Aexp (- E/RT) f (a) founding mathematical models, in formula, da/dt is reaction rate,
A is frequency factor, and E is reaction activity, and R is gas constant, and T is temperature, and f (a) is reaction model, obtains the thermosetting resin
The thermoplasticity time at a temperature of different process；4th step is chosen on the rising temperature curve of thermosetting resin heat enthalpy value reaction
Three temperature spots, the ascending temperature section for being molded thermosetting resin is 100 DEG C to 180 DEG C, chooses 130 DEG C, 150 DEG C and 170
DEG C three technological parameters suppress standard aluminum winding displacement stick, and aluminium row is 21mm, width 51mm having a size of thickness, wrapped A layer of half lap put down around
B layers of packet, length are 1.2 meters, and each molding system 10, soaking time is calculated according to the mathematical model of third step as a result, comparison
The dielectric strength of aluminium winding displacement stick and energy consumption ratio after molding；5th step, using the heat analysis Differential Scanning Calorimeter mould of model DSC1
Heating rate and insulating process, the heating rate of molding apparatus when quasi- molding apparatus work are determined by electrothermal resistance silk, are 1~5
℃/min；6th step, the vitrifying after thermosetting resin thermoplastification is tested using the heat analysis Differential Scanning Calorimeter of model DSC1
Transition temperature；7th step, wherein dielectric strength is high for the selection of comparison multiple groups glass transition temperature, consumes energy than relatively low temperature
It puts to get heat enthalpy value molding parameters are arrived.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4304064A1 (en) * | 2022-07-06 | 2024-01-10 | Siemens Aktiengesellschaft | Determination of a curing profile of an electrical insulation layer |
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| CN108051474B (en) * | 2017-12-04 | 2020-05-19 | 哈尔滨电机厂有限责任公司 | Method for prejudging service life of impregnating varnish storage process for air-cooled mould pressing integral-immersion steam turbine generator |
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