CN104388641A - Flexible rapid heating method based on blank shape features - Google Patents
Flexible rapid heating method based on blank shape features Download PDFInfo
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- CN104388641A CN104388641A CN201410760971.6A CN201410760971A CN104388641A CN 104388641 A CN104388641 A CN 104388641A CN 201410760971 A CN201410760971 A CN 201410760971A CN 104388641 A CN104388641 A CN 104388641A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to the technical field of hot stamping forming, in particular to a flexible rapid heating method based on blank shape characteristics. The method comprises steps as follows: shape feature recognition is performed on cold blanks under machine vision equipment, and recognition results and obtained blank digital models are fed back to a main control system; then the main control system recognizes that whether the cold blanks are regular or not in shape, the blanks in irregular shapes are conveyed to an induction heating furnace through a conveying system, and the blanks in regular shapes are conveyed to an electric heating furnace; the main control system controls heating areas and heating temperatures of the blanks in the induction heating furnace according to the blank digital models until the blanks are heated to the Curie point; finally, the blanks are conveyed into a resistive heating furnace for heat preservation until the blanks are completely austenitized.
Description
Technical field
The present invention relates to hot press-formed processing technique field, refer in particular to a kind of flexibility rapid heating method based on blank shape feature.
Background technology
In recent years, along with the growing interest to automotive light weight technology, fuel economy and passive safety, one in conjunction with punching press and thermal treatment, for the new technology of the ultra-high strength steel plate that is shaped (UHSS) stamping parts, instant heating stamping technology is widely used in the production of automobile structure, this technology is by after the complete austenitizing of thermoforming steel plate heating and thermal insulation, be transferred in hot-forming die and carry out die quench forming, obtain the thermoformed parts of superstrength, not only alleviate the weight of part, also meet the demand of crashworthiness simultaneously.
In traditional heat forming processes, blank generally carries out heating in the resistance-type process furnace adopting radiant heating pattern, complete austenitizing, and this process need 5 ~ 7 minutes is the longest step consuming time in the whole thermoforming production cycle.In addition because this kind of electric furnace relies on the thermaltransmission mode of radiation and convection current to heat blank, the thickness of blank, condition of surface make its in-furnace temperature be 800 ~ 100 roller bottom type, need the time of about 2 minutes just can reach design temperature in stepped start-stop system or cabinet-type electric furnace, within remaining 2 ~ 8 minutes, be just complete austenitizing process.In addition, because the lower energy utilization rate of resistance-type process furnace, larger occupation of land space and higher input cost need new rapid heating technology to enhance productivity, reduce fund input and reduce energy consumption.
Current existing rapid heating technology mainly contains induction heating and conduction heating, in energy utilization rate: conduction heating > induction heating > radiation heating, in heating rate: conduction heating > induction heating > radiation heating, but in blank shape adaptability: radiation heating > induction heating > conduction heating, in addition when blank temperature arrives Curie temperature, the efficiency of induction heating will decline to a great extent.On the other hand, in order to prevent high temperature plate oxidized in conveying and heat-processed, the business-like thermoforming steel plate of major part has inoxidzable coating, as Al-Si coating, these coatings with basic asphalt mixture after just there is good plasticity and oxidation proof properties, and rapid heating can not provide high temperature needed for alloying and relatively long soaking time.Although rapid heating has large heating rate, be difficult to provide a comparatively constant hot environment to make blank complete austenitizing.
Comprehensively above-mentioned, under consideration auto parts quantize prerequisite increasingly in small batches, when many thermoforming line parallel productions or one-mold multiple-member, when part shape is comparatively regular, as nearly rectangle etc., adopts conduction heating, blank is heated to 700 ~ 800 rapidly; When part shape is comparatively complicated, as B post blank, adopts induction heating, blank is heated to Curie temperature rapidly, then these blank rotaries is moved in resistance-type process furnace and carry out the alloying of coating and the complete austenitizing of matrix.Adopt this combined type flexible rapid heating method; shortening heat-up time; while improving heating efficiency and production efficiency; also save the repetition acquisition cost of heating installation; also oxidation proof properties and the forming property of paint sheet be can ensure simultaneously, replacing furnace roller, the maintenance cost of protection gas equipment purchasing and roller hearth type heating furnace eliminated.Therefore, this flexibility rapid heating method has wide future in engineering applications.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of flexibility rapid heating method based on blank shape feature, the method can effectively be enhanced productivity, production line automation rate and reduce occupation area of equipment, avoid the repetition acquisition cost of heating installation simultaneously and solve multi-blank conllinear heating this flexible production problem.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of flexibility rapid heating method based on blank shape feature, it is characterized in that comprising the steps: steps A, cold blank carries out shape facility identification under machine vision equipment, and recognition result and the blank digital model that obtains are fed back to turn-key system;
Step B, identify by turn-key system the blank that cold blank is blank in irregular shape or regular shape, and by delivery system, blank in irregular shape is delivered in induction heater, the blank of regular shape is delivered in electrical heater;
Step C, control the heating region of blank in induction heater and Heating temperature, until blank heating is to Curie temperature by turn-key system according to blank digital model;
Step D, the blank obtained by step C are delivered in resistance-type process furnace and carry out being incubated until blank complete austenitizing.
Preferably, in described step C, the in-furnace temperature in induction heater is 700 ~ 800 degrees Celsius.
Preferably, in described step C, the in-furnace temperature in induction heater is 740 ~ 760 degrees Celsius.
Preferably, in described step C, infrared measurement of temperature and closed-loop feedback control system is adopted to carry out temperature control.
Preferably, in described step C, turn-key system controls heating power according to blank transfer rate and digital model.
Preferably, the heat-up time in described step C is 5 ~ 10 seconds.
Preferably, in described step D, the in-furnace temperature of resistance-type process furnace is 850 ~ 950 degrees Celsius.
Preferably, the soaking time in described step D is 3 ~ 5 minutes.
Beneficial effect of the present invention is:
The invention provides a kind of flexibility rapid heating method based on blank shape feature, compared with existing heating technique method, this kind is based on the flexibility rapid heating method of blank shape feature, its beneficial effect is: to identify blank with machine vision technique and shunt conveying, with the blank digital model collected to control follow-up rapid heating and insulating process, realize the heating of multi-blank conllinear.Relative to conventional radiation type of heating, promote mainly to save in heating efficiency blank be heated to red heat state from room temperature before temperature rise time, the time saved is approximately 30%, in cost saving, relative to roller bottom type or walking beam furnace, occupation area of equipment, maintenance and replacing parts expense significantly reduce; Relative to simple induction heating or conduction heating, it can adapt to the blank of various shape and simultaneously for many production lines or many molds provide heat material, can have high flexibility.
Accompanying drawing explanation
Fig. 1 is the quick flexible heater method schematic diagram of the embodiment of the present invention.
Fig. 2 is the induction heater reduced graph of the rapid heating step of the embodiment of the present invention.
Fig. 3 is the conduction heating stove reduced graph of the rapid heating step of the embodiment of the present invention.
Wherein Reference numeral comprises: 1-machine vision equipment, 2-cold blank, 3-irregular blank, 4-regular blank, 5-induction heater, 6-conduction heating stove, 7-traditional heating stove, 8-ruhmkorff coil, 9-T-shaped blank, 10-conductive electrode, 11-rectangular billet.
Embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with embodiment and accompanying drawing, the present invention is further illustrated, and the content that embodiment is mentioned not is limitation of the invention.
As shown in Figure 1 to Figure 3, a kind of flexibility rapid heating method based on blank shape feature, in embodiment one, comprises the steps:
Steps A, cold blank 21 carry out shape facility identification under machine vision equipment, and recognition result and the blank digital model that obtains are fed back to turn-key system;
Step B, to identify cold blank 2 by turn-key system be blank 3 in irregular shape or the blank of regular shape 4, and be delivered in induction heater 5 by delivery system by blank 3 in irregular shape, is delivered in electrical heater 6 by the blank 4 of regular shape;
Step C, control the heating region of blank 3 in induction heater 5 and Heating temperature, until blank 3 is heated to Curie temperature by turn-key system according to blank digital model; In-furnace temperature in induction heater 5 is 700 ~ 750 degrees Celsius, and heat-up time is 10 seconds.
Step D, the blank (3,4) obtained by step C are delivered in resistance-type process furnace 7 and carry out being incubated until blank complete austenitizing, and concrete, the in-furnace temperature of resistance-type process furnace 7 is 850 ~ 900 degrees Celsius, and soaking time is 5 minutes.
The technical program to identify blank with machine vision technique and shunts conveying, with the blank digital model collected to control follow-up rapid heating and insulating process, realizes the heating of multi-blank conllinear.Relative to conventional radiation type of heating, promote mainly to save in heating efficiency blank be heated to red heat state from room temperature before temperature rise time, the time saved is approximately 30%, in cost saving, relative to roller bottom type or walking beam furnace, occupation area of equipment, maintenance and replacing parts expense significantly reduce; Relative to simple induction heating or conduction heating, it can adapt to the blank of various shape and simultaneously for many production lines or many molds provide heat material, can have high flexibility.
The induction heater related to as Fig. 2 is equipped with ruhmkorff coil 8, T-shaped blank 9(and irregular blank 3) be placed in its furnace chamber.The conduction heating stove related to as Fig. 3 is equipped with conductive electrode 10, rectangular billet 11(and regular blank 4) two ends clamping is in-between the electrodes.
In the present embodiment, the e Foerderanlage of delivery system can be multi-axis robot also can be straight line conveyer tool hand or ceramic transmission chain, process furnace can be Multi-deck chamber furnace or roller hearth type heating furnace, and machine vision equipment is to the standard deviation of the billet size aspect that the judgement criteria that whether regular blank is adapts to for actual heating system characteristic
, when the standard deviation of charge length and width
,
, be all less than
time, rapid heat-up stage adopts conduction heating, otherwise, then adopt induction heating.
Preferably, in described step C, adopt infrared measurement of temperature and closed-loop feedback control system to carry out temperature control, turn-key system controls heating power according to blank transfer rate and digital model, and not only temperature control is more accurate, can also improve energy utilization rate.
Test shows: by the quick flexible heater method of embodiment one, saving heat-up time is 32.1%, reduces energy consumption 18.3%, heats two or more difform blank, for the hot forming production line of more than two or the above hot-forming die of two covers provide heat material, practicality is stronger.
As shown in Figure 1, a kind of flexibility rapid heating method based on blank shape feature, in embodiment two, comprises the steps:
Steps A, cold blank 21 carry out shape facility identification under machine vision equipment, and recognition result and the blank digital model that obtains are fed back to turn-key system;
Step B, to identify cold blank 2 by turn-key system be blank 3 in irregular shape or the blank of regular shape 4, and be delivered in induction heater 5 by delivery system by blank 3 in irregular shape, is delivered in electrical heater 6 by the blank 4 of regular shape;
Step C, control the heating region of blank 3 in induction heater 5 and Heating temperature, until blank 3 is heated to Curie temperature by turn-key system according to blank digital model; In-furnace temperature in induction heater 5 is 750 ~ 800 degrees Celsius, and heat-up time is 5 seconds.Adopt infrared measurement of temperature and closed-loop feedback control system to carry out temperature control, turn-key system controls heating power according to blank transfer rate and digital model.
Step D, the blank (3,4) obtained by step C are delivered in resistance-type process furnace 7 and carry out being incubated until blank complete austenitizing, and concrete, the in-furnace temperature of resistance-type process furnace 7 is 900 ~ 950 degrees Celsius, and soaking time is 3 minutes.
Test shows: by the quick flexible heater method of embodiment two, at least can save heat-up time is 32.7%, reduces energy consumption 16.2%, heats two or more difform blank, for the hot forming production line of more than two or the above hot-forming die of two covers provide heat material, practicality is stronger.
As shown in Figure 1, a kind of flexibility rapid heating method based on blank shape feature, in embodiment three, comprises the steps:
Steps A, cold blank 21 carry out shape facility identification under machine vision equipment, and recognition result and the blank digital model that obtains are fed back to turn-key system;
Step B, to identify cold blank 2 by turn-key system be blank 3 in irregular shape or the blank of regular shape 4, and be delivered in induction heater 5 by delivery system by blank 3 in irregular shape, is delivered in electrical heater 6 by the blank 4 of regular shape;
Step C, control the heating region of blank 3 in induction heater 5 and Heating temperature, until blank 3 is heated to Curie temperature by turn-key system according to blank digital model; In-furnace temperature in induction heater 5 is 740 ~ 760 degrees Celsius, and heat-up time is 8 seconds.Adopt infrared measurement of temperature and closed-loop feedback control system to carry out temperature control, turn-key system controls heating power according to blank transfer rate and digital model.
Step D, the blank (3,4) obtained by step C are delivered in resistance-type process furnace 7 and carry out being incubated until blank complete austenitizing, and concrete, the in-furnace temperature of resistance-type process furnace 7 is 875 ~ 925 degrees Celsius, and soaking time is 3.5 minutes.
Test shows: by the quick flexible heater method of embodiment three, at least can save heat-up time is 36.5%, reduces energy consumption 19.6%, heats two or more difform blank, for the hot forming production line of more than two or the above hot-forming die of two covers provide heat material, practicality is stronger.
Above-described embodiment is the present invention's preferably implementation, and in addition, the present invention can also realize by alternate manner, and under the prerequisite not departing from the technical program design, any apparent replacement is all within protection scope of the present invention.
Claims (8)
1., based on a flexibility rapid heating method for blank shape feature, it is characterized in that comprising the steps:
Steps A, cold blank (2) (1) under machine vision equipment carry out shape facility identification, and recognition result and the blank digital model obtained are fed back to turn-key system;
Step B, identify cold blank (2) for blank in irregular shape (3) or the blank of regular shape (4) by turn-key system, and by delivery system, blank in irregular shape (3) is delivered in induction heater (5), the blank (4) of regular shape is delivered in electrical heater (6);
Step C, control blank (3) heating region in induction heater (5) and Heating temperature, until blank (3) is heated to Curie temperature by turn-key system according to blank digital model;
Step D, the blank (3,4) obtained by step C are delivered in resistance-type process furnace (7) and carry out being incubated until blank complete austenitizing.
2. a kind of flexibility rapid heating method based on blank shape feature according to claim 1, it is characterized in that: in described step C, the in-furnace temperature in induction heater (5) is 700 ~ 800 degrees Celsius.
3. a kind of flexibility rapid heating method based on blank shape feature according to claim 1, it is characterized in that: in described step C, the in-furnace temperature in induction heater (5) is 740 ~ 760 degrees Celsius.
4. a kind of flexibility rapid heating method based on blank shape feature according to claim 1, is characterized in that: in described step C, adopts infrared measurement of temperature and closed-loop feedback control system to carry out temperature control.
5. a kind of flexibility rapid heating method based on blank shape feature according to claim 4, it is characterized in that: in described step C, turn-key system controls heating power according to blank transfer rate and digital model.
6. a kind of flexibility rapid heating method based on blank shape feature according to claim 1, is characterized in that: the heat-up time in described step C is 5 to 10 seconds.
7. a kind of flexibility rapid heating method based on blank shape feature according to claim 1, it is characterized in that: in described step D, the in-furnace temperature of resistance-type process furnace (7) is 850 ~ 950 degrees Celsius.
8. a kind of flexibility rapid heating method based on blank shape feature according to claim 1, is characterized in that: the soaking time in described step D is 3 ~ 5 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410760971.6A CN104388641A (en) | 2014-12-12 | 2014-12-12 | Flexible rapid heating method based on blank shape features |
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| CN201410760971.6A CN104388641A (en) | 2014-12-12 | 2014-12-12 | Flexible rapid heating method based on blank shape features |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688651A (en) * | 2018-12-27 | 2019-04-26 | 东营源纳合金科技有限公司 | A kind of irregular alloy blank heating device and its heating means |
| CN109773099A (en) * | 2019-02-20 | 2019-05-21 | 华中科技大学 | Thermal deformation workpiece blank heating means and processing method based on gradient induction heating |
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| US20100086002A1 (en) * | 2008-10-02 | 2010-04-08 | Ms Autotech Co., Ltd. | Heating Furnace System for Hot Stamping |
| CN102513798A (en) * | 2011-12-31 | 2012-06-27 | 钢铁研究总院 | Custom equipment of hot-forming parts and method thereof |
| DE102012001742A1 (en) * | 2012-01-28 | 2013-08-01 | Volkswagen Aktiengesellschaft | Device, useful for heating, hot-forming and press-hardening of metal sheet workpieces, comprises a first heat station, a second heat station in which the workpieces are heated or held at a specified temperature, and a third heat station |
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2014
- 2014-12-12 CN CN201410760971.6A patent/CN104388641A/en active Pending
Patent Citations (3)
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| US20100086002A1 (en) * | 2008-10-02 | 2010-04-08 | Ms Autotech Co., Ltd. | Heating Furnace System for Hot Stamping |
| CN102513798A (en) * | 2011-12-31 | 2012-06-27 | 钢铁研究总院 | Custom equipment of hot-forming parts and method thereof |
| DE102012001742A1 (en) * | 2012-01-28 | 2013-08-01 | Volkswagen Aktiengesellschaft | Device, useful for heating, hot-forming and press-hardening of metal sheet workpieces, comprises a first heat station, a second heat station in which the workpieces are heated or held at a specified temperature, and a third heat station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688651A (en) * | 2018-12-27 | 2019-04-26 | 东营源纳合金科技有限公司 | A kind of irregular alloy blank heating device and its heating means |
| CN109773099A (en) * | 2019-02-20 | 2019-05-21 | 华中科技大学 | Thermal deformation workpiece blank heating means and processing method based on gradient induction heating |
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Application publication date: 20150304 |