CN105094176A - Method for determining temperature of warm-stamping and heating austenitic stainless steel seal head - Google Patents
Method for determining temperature of warm-stamping and heating austenitic stainless steel seal head Download PDFInfo
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- CN105094176A CN105094176A CN201510426733.6A CN201510426733A CN105094176A CN 105094176 A CN105094176 A CN 105094176A CN 201510426733 A CN201510426733 A CN 201510426733A CN 105094176 A CN105094176 A CN 105094176A
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- temperature
- punching press
- plate
- end socket
- heating
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Abstract
The invention relates to the technology of stamping and manufacturing seal heads, and provides a method for determining the temperature of warm-stamping and heating an austenitic stainless steel seal head. The method includes carrying out seal head warm-stamping trial test on an austenitic stainless steel plate, calculating control parameter k according to temperature dropping calculating formula, and applying the parameter of the austenitic stainless steel seal heads to be processed with same specifications and materials to calculate the heating temperature of the plate. The method is based on research on unstable state heat transfer mechanism, and is applicable to austenitic stainless steel seal heads having different specifications and formed through a warm-stamping process. When control parameter k of warm stamping austenitic stainless steel seal head with given specification, the warm stamping and temperature of the seal head of such specification can be obtained through simple calculation. The temperature of the straight flange during a stamping process is always higher than the lower temperature limit required. The calculation results are accurate, operation is simple, and the technique is plausible.
Description
Technical field
The present invention relates to head pressing and manufacture field, being specifically related to a kind of method determining austenitic stainless steel end socket temperature punching press heating-up temperature, is that one considers head skirt section temperature in austenite stainless steel end socket temperature punching course and to decline the method for (hereinafter referred to as temperature drop) constant temperature punching press heating-up temperature really.
Background technology
Austenitic stainless steel has good corrosion resistance, plasticity, toughness because of it, is widely used in the manufacture of pressure vessel, boiler, nuclear power generating equipment.For pressure vessel, a large amount of application is had at this kind equipments of field such as new forms of energy, medicine, food processings, such as, for storing the tank car of the cryogenic gases such as liquid oxygen, liquid nitrogen and liquefied natural gas (LNG), tank car and strain hardening container in new energy field, for the fermentation tank etc. of brewing in field of food.As can be seen here, austenitic stainless steel pressure vessels and corresponding parts thereof have huge demand in numerous areas.End socket is as the vitals of the main equipment such as pressure vessel, boiler, and its demand increases with the growth of the demand of the equipment such as pressure vessel, boiler, and this just proposes higher requirement to the production in enormous quantities of end socket and products thereof quality.
Can there is deformation-induced martensitic transformation in metastable state austenitic stainless steel, this can have an impact to the mechanical property of seal head material, even causes the inefficacy of end socket, causes potential safety hazard in head pressing process.Finding after deliberation, by improving temperature during warm working, martensitic phase variable in seal head forming process can be effectively reduced, to ensure end socket performance.
At present, factory is everlasting after punching course carries out half and heats plate again to realize warm punching press, and its firing equipment is spray gun, uses infrared thermometer detected temperatures.
But, only heated a part for plate in warm punching course, therefore there is the temperature difference in plate itself.Simultaneously, because the temperature of punch, die, blank holder is basic consistent with environment temperature, therefore heat transmission can be there is between plate and mould in warm punching course, these all result in the decline of plate temperature in punching course, if environment temperature is lower, or the punching press time is longer, then the temperature drop amplitude of plate becomes large, this will cause press temperature not high enough, plate generation deformation-induced martensitic transformation in punching course, end socket hydraulic performance decline.For the end socket of different size, rationally determining heating-up temperature, is the key point of warm Sheet Metal Forming Technology.
Current, factory, when determining warm punching press heating-up temperature, does not have theoretical foundation can reference, can only lean on knowhow conjecture heating-up temperature for many years, there is very large blindness.If thermal creep stress is unreasonable, owing to contacting the reason such as heat radiation in actual punching course, there is temperature drop in plate, causes that Sheet Metal Stamping Process is temperature required cannot be met, and end socket performance is difficult to guarantee, and then is difficult to the advantage having given play to warm punching press.If start to be stamped into time (hereinafter referred to as the punching press time) that punching press terminates, these three principal elements of initial heating temperature after forethought to environment temperature, plate heating to the impact of temperature drop, understand temperature drop law, the temperature drop scope in head pressing process, thus determine rational initial heating temperature, ensure that in punching course, plate temperature meets the demands, then can provide safeguard for the quality of end socket product.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes in prior art the deficiency being difficult to consider temperature drop when determining end socket heating-up temperature, provides a kind of method determining austenitic stainless steel end socket temperature punching press heating-up temperature.
For solving this technical problem, solution of the present invention is:
A kind of method determining austenitic stainless steel end socket temperature punching press heating-up temperature is provided, comprises the following steps:
(1) by predetermined dimension, end socket temperature punching press trial test is carried out to austenite stainless steel plate material, the environment temperature T before record punching press
h, the temperature T of plate after heating
j, start to be stamped into time t that punching press terminates after heating, temperature T that punching press completes rear head straight section
end;
(2) according to warm extrusion die formula (T
end-T
h)/(T
j-T
h)=exp (-kt) calculates controling parameters k, the T in formula
h, T
j, t, T
endbe test in step (1) to obtain;
(3) for the austenitic stainless steel end socket to be processed that specification and material are all identical, the heating-up temperature T of plate is calculated according to following formula
j':
T
j′＝(T
end′-T
h′)/exp(-k·t′)+T
h′
In formula, T
h' be the environment temperature before punching press, be to measure the parameter obtained before carrying out end socket temperature punching operation; T ' and T
end' be respectively heating after start to be stamped into time that punching press terminates, temperature that punching press completes rear head straight section, be the parameter just can determined before carrying out end socket temperature punching operation; Controling parameters k is obtained (controling parameters k and the factor such as environment temperature, punching press time have nothing to do, and only depend on plate size and material) by step (2).
Invention further provides a kind of austenitic stainless steel end socket temperature process for stamping, comprise the following steps:
(1) by the specification of austenitic stainless steel end socket to be processed, end socket temperature punching press trial test is carried out with the sheet material of same material, the environment temperature T before record punching press
h, the temperature T of plate after heating
j, start to be stamped into time t that punching press terminates after heating, temperature T that punching press completes rear head straight section
end;
(2) according to warm extrusion die formula (T
end-T
h)/(T
j-T
h)=exp (-kt) calculates controling parameters k, the T in formula
h, T
j, t, T
endbe test in step (1) to obtain;
(3) according to formula T
j'=(T
end '-T
h')/exp (-kt ')+T
h' calculate the heating-up temperature T of plate
j'; In formula, T
h' be the environment temperature before punching press, be to measure the parameter obtained before carrying out end socket temperature punching operation; T ' and T
end' be respectively heating after start to be stamped into time that punching press terminates, temperature that punching press completes rear head straight section, be the parameter just can determined before carrying out end socket temperature punching operation; Controling parameters k is obtained (controling parameters k and the factor such as environment temperature, punching press time have nothing to do, and only depend on plate size and material) by step (2);
(4) end socket temperature punching operation is carried out to plate, obtain the austenitic stainless steel end socket of predetermined dimension; The heating-up temperature controlling plate in end socket temperature punching course is not less than T in step (3)
j' numerical value.
In the present invention, the concrete operations flow process of described end socket temperature punching press is:
A () plate is positioned on die by mechanical chuck;
B () punch and upper blank holder move down simultaneously, upper blank holder compresses plate;
C () punch undershoot plate is extremely close to the half degree of depth (as shown in Figure 1);
D () punch and upper blank holder move simultaneously, the plate be out of shape propped up by support, heat the excircle part of plate to being not less than set point of temperature, with infrared thermometer detected temperatures at the scene with spray gun;
E () plate resets, upper blank holder, punch move down simultaneously, until upper blank holder compresses plate;
F () punch undershoot is until setpoint distance;
G () punching press is complete, punch and upper blank holder move simultaneously, and end socket is propped up by support, and is transported to appointed place by plant equipment.
Contemplated by the invention the impact of the factors such as site environment temperature, punching press time, heating-up temperature, by carrying out Study on Numerical Simulation to the punching press of end socket temperature, find the bulk parameter relevant to temperature drop in punching course, and realize the determination to warm punching press heating-up temperature thus.
Compared with prior art, the invention has the beneficial effects as follows:
(1) defining method of warm punching press heating-up temperature in the present invention, its Main Basis derives from the research to unsteady-state heat transfer mechanism, is applicable to the austenite stainless steel end socket of all different sizes adopting warm Sheet Metal Forming Technology shaping.After the controling parameters k of austenite stainless steel end socket temperature punching press obtaining given specification, the warm punching press heating-up temperature of this specification end socket can according to the present invention by simply calculating.
(2) application of the inventive method, can make workman before carrying out warm punching press according to required punching press minimum temperature T
end, punching press time t and environment temperature T
hdetermine the heating-up temperature in punching course, thus guarantee that the temperature at head skirt section place in punching course is all the time higher than the lowest temperature required.Have and calculate accurately, simple to operate, technical feasibility, can directly apply to the advantage of industry spot etc.
Accompanying drawing explanation
Fig. 1 is end socket temperature punching press schematic diagram.
Reference numeral in figure: 1 blank holder, 2 punch, 3 dies, 4 plates, 5 heating parts (punching press complete after, as head skirt section position).
Embodiment
Calculate and end socket temperature punching operation for the warm punching press heating-up temperature of domestic typical austenitic stainless steel S30408 material end socket below, the main process of the austenitic stainless steel end socket temperature punching press heating-up temperature Forecasting Methodology based on unsteady-state heat transfer theory be described further:
(1) for the standard oval austenitic stainless steel end socket of EHA550 × 6, interior diameter is 550mm, thickness is 6mm, carry out end socket temperature punching press trial test, after the environment temperature 30 DEG C before record punching press, heating, after the temperature 74 DEG C of plate, heating, start to be stamped into the temperature 53 DEG C of time 13s that punching press terminates, punching press rear head straight section;
(2) by T
h=30 DEG C, T
j=74 DEG C, t=13s, T
end=53 DEG C, bring warm extrusion die formula into
(T
end-T
h)/(T
j-T
h)＝exp(-k·t)
Try to achieve controling parameters k=0.0499;
(3) for the austenitic stainless steel end socket of same size and material, controling parameters k value is identical.Rear head straight section place temperature T is completed to ask warm punching press
end' be not less than 60 DEG C, start to be stamped into time t '=13s that punching press terminates after heating, in-site measurement environment temperature T
h'=30 DEG C, then according to formula T
j'=(T
end'-T
h')/exp (-kt ')+T
h', required heating-up temperature T can be calculated
j' 87 DEG C should be not less than;
(4) the concrete operations flow process of end socket temperature punching press is:
A () plate 4 is positioned on die 3 by mechanical chuck;
B () punch 2 and upper blank holder 1 move down simultaneously, upper blank holder 1 compresses plate 4;
(c) punch 2 undershoot plate 4 to close to the half degree of depth, as shown in Figure 1;
D () punch 2 and upper blank holder 1 move simultaneously, the plate 4 be out of shape propped up by support, heat the excircle part (heating part 5 namely in figure) of plate 4 to being not less than set point of temperature, with infrared thermometer detected temperatures at the scene with spray gun;
E () plate 4 resets, upper blank holder 1, punch 2 move down simultaneously, until upper blank holder 1 compresses plate 4;
F () punch 2 undershoot is until setpoint distance;
G () punching press is complete, punch 2 and upper blank holder 1 move simultaneously, and end socket is propped up by support, and is transported to appointed place by plant equipment.
In the present embodiment, when carrying out the step (d) of end socket temperature punching operation, the excircle part (heating part 5 namely in figure) of plate is heated with regard to only need control heating-up temperature is not less than 87 DEG C with spray gun, can ensure that in punching course, plate temperature meets the demands, ensure end socket product quality.
Claims (3)
1. determine a method for austenitic stainless steel end socket temperature punching press heating-up temperature, it is characterized in that, comprise the following steps:
(1) by predetermined dimension, end socket temperature punching press trial test is carried out to austenite stainless steel plate material, the environment temperature T before record punching press
h, the temperature T of plate after heating
j, start to be stamped into time t that punching press terminates after heating, temperature T that punching press completes rear head straight section
end;
(2) according to warm extrusion die formula (T
end-T
h)/(T
j-T
h)=exp (-kt) calculates controling parameters k, the T in formula
h, T
j, t, T
endbe test in step (1) to obtain;
(3) for the austenitic stainless steel end socket to be processed that specification and material are all identical, the heating-up temperature T of plate is calculated according to following formula
j':
T
j′＝(T
end′-T
h′)/exp(-k·t′)+T
h′
In formula, T
h' be the environment temperature before punching press, be to measure the parameter obtained before carrying out end socket temperature punching operation; T ' and T
end' be respectively heating after start to be stamped into time that punching press terminates, temperature that punching press completes rear head straight section, be the parameter just can determined before carrying out end socket temperature punching operation; Controling parameters k is obtained by step (2).
2. an austenitic stainless steel end socket temperature process for stamping, is characterized in that, comprise the following steps:
(1) by the specification of austenitic stainless steel end socket to be processed, end socket temperature punching press trial test is carried out with the sheet material of same material, the environment temperature T before record punching press
h, the temperature T of plate after heating
j, start to be stamped into time t that punching press terminates after heating, temperature T that punching press completes rear head straight section
end;
(2) according to warm extrusion die formula (T
end-T
h)/(T
j-T
h)=exp (-kt) calculates controling parameters k, the T in formula
h, T
j, t, T
endbe test in step (1) to obtain;
(3) according to formula T
j'=(T
end'-T
h')/exp (-kt ')+T
h' calculate the heating-up temperature T of plate
j'; In formula, T
h' be the environment temperature before punching press, be to measure the parameter obtained before carrying out end socket temperature punching operation; T ' and T
end' be respectively heating after start to be stamped into time that punching press terminates, temperature that punching press completes rear head straight section, be the parameter just can determined before carrying out end socket temperature punching operation; Controling parameters k is obtained by step (2);
(4) end socket temperature punching operation is carried out to plate, obtain the austenitic stainless steel end socket of predetermined dimension; The heating-up temperature controlling plate in end socket temperature punching course is not less than T in step (3)
j' numerical value.
3. method according to claim 1 and 2, is characterized in that, the concrete operations flow process of described end socket temperature punching press is:
A () plate is positioned on die by mechanical chuck;
B () punch and upper blank holder move down simultaneously, upper blank holder compresses plate;
C () punch undershoot plate is extremely close to the half degree of depth;
D () punch and upper blank holder move simultaneously, the plate be out of shape propped up by support, heat the excircle part of plate to being not less than set point of temperature, with infrared thermometer detected temperatures at the scene with spray gun;
E () plate resets, upper blank holder, punch move down simultaneously, until upper blank holder compresses plate;
F () punch undershoot is until setpoint distance;
G () punching press is complete, punch and upper blank holder move simultaneously, and end socket is propped up by support, and is transported to appointed place by plant equipment.
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| CN201510426733.6A CN105094176B (en) | 2015-07-20 | 2015-07-20 | A kind of method for determining austenitic stainless steel end socket temperature punching press heating-up temperature |
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| CN201510426733.6A CN105094176B (en) | 2015-07-20 | 2015-07-20 | A kind of method for determining austenitic stainless steel end socket temperature punching press heating-up temperature |
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| CN105094176B CN105094176B (en) | 2017-03-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110465595A (en) * | 2019-09-26 | 2019-11-19 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Stamping die and stamping device |
| CN110961516A (en) * | 2018-09-29 | 2020-04-07 | 佛山市顺德区美的电热电器制造有限公司 | Austenitic stainless steel kitchen ware and processing method thereof |
| CN113441645A (en) * | 2021-07-14 | 2021-09-28 | 湖南湘投金天科技集团有限责任公司 | Titanium alloy end socket and preparation method and application thereof |
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| CN104525672A (en) * | 2014-11-19 | 2015-04-22 | 宁波市普力升工贸有限公司 | Warm stretching technology of stainless steel stretching workpiece |
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2015
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| CN101148741A (en) * | 2006-09-22 | 2008-03-26 | 宝山钢铁股份有限公司 | Thin belt continuous casting austenitic stainless steel belt and manufacturing method thereof |
| JP2011115803A (en) * | 2009-12-01 | 2011-06-16 | Nisshin Steel Co Ltd | Blanking method for reducing noise during break-through |
| CN103374685A (en) * | 2012-04-23 | 2013-10-30 | 钢铁研究总院 | Stainless steel material and manufacturing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110961516A (en) * | 2018-09-29 | 2020-04-07 | 佛山市顺德区美的电热电器制造有限公司 | Austenitic stainless steel kitchen ware and processing method thereof |
| CN110465595A (en) * | 2019-09-26 | 2019-11-19 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Stamping die and stamping device |
| CN113441645A (en) * | 2021-07-14 | 2021-09-28 | 湖南湘投金天科技集团有限责任公司 | Titanium alloy end socket and preparation method and application thereof |
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| CN105094176B (en) | 2017-03-15 |
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