CN101948989A - Aging treatment method and temperature control method for aluminum alloy bumpers - Google Patents
Aging treatment method and temperature control method for aluminum alloy bumpers Download PDFInfo
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- CN101948989A CN101948989A CN 201010507159 CN201010507159A CN101948989A CN 101948989 A CN101948989 A CN 101948989A CN 201010507159 CN201010507159 CN 201010507159 CN 201010507159 A CN201010507159 A CN 201010507159A CN 101948989 A CN101948989 A CN 101948989A
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Abstract
The invention relates to an aging treatment method and a temperature control method for Series 7000 aluminum alloy bumpers. The aging treatment method comprises the following steps: (a) raising the temperature of a furnace chamber to a first aging temperature in 1 hour; (b) maintaining the first aging temperature for 8 hours; (c) raising the temperature of the furnace chamber to a second aging temperature in a half hour; and (d) maintaining the second aging temperature for 8 hours again; in the steps (a) and (c), PLC controls the group number of input heater strips, and respectively raises the temperature of the furnace chamber to corresponding aging temperatures in a plurality of sub-stages according to the principle of gradual decrease of heating rate; and in the steps (b) and (d), the PLC controls the group number of the input heater strip and the state of an exhaust inlet of the furnace chamber according to the change of the temperature of the furnace chamber, so that the temperature of the furnace chamber is kept in corresponding aging temperature. The method can effectively solve the problem that the temperature leaps high in the process of thermal insulation, greatly reduce the fluctuation range of the temperature of the furnace chamber, and guarantee the consistency of the qualities of each batch of products.
Description
Technical field
The present invention relates to large aluminum alloy product aging treatment method, particularly the temperature-controlled process of 7000 series alloys collision bumper aging treatment methods and aging oven.
Background technology
The aging oven of existing large product is equipped with blower fan, is used to promote circulating of air in the furnace chamber, and there is the temperature phenomenon of leaping high in this aging oven at holding stage, usually after stopping heating, can slowly rise more than 5 ℃ in the stirring lower furnace chamber temperature of blower fan.On the other hand, the existing uncontrollable temperature rise rate of aging oven, all drop at the temperature rise period heating wire, enter heat preservation zone with utmost dispatch, but what, seasonal variation etc. of blow-on door time length, material have very big influence to the time of heating up, the intensification difference can reach 15 minutes, the consistence of heating-up time when therefore existing aging oven can't guarantee each batch ageing treatment, thus can't guarantee the quality of product.
Because existing aging oven heating-up time instability, there is the temperature phenomenon of leaping high during insulation, make existing aging oven can't handle the workpiece that quality product is had relatively high expectations.For example, can't satisfy the ageing treatment requirement of 7000 series alloys collision bumpers.
Summary of the invention
The temperature-controlled process that the purpose of this invention is to provide a kind of aging oven, with the temperature rise rate of control aging oven, and the temperature that the solves holding stage problem of leaping high.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
A kind of temperature-controlled process of aging oven comprises:
The heating unit of aging oven adopts independently heater strip of plural groups, and the air suction inlet inside and outside the negative pressure end setting of aging oven blower fan can be communicated with furnace chamber;
In the temperature rise period, the input group number of PLC control heater strip by the principle that temperature rise rate reduces gradually, divides a plurality of subs that the furnace chamber temperature is risen to aging temp;
At holding stage, PLC is according to the furnace chamber variation of temperature, and the input group number of control heater strip and the On/Off of described air suction inlet remain on aging temp with the furnace chamber temperature.
Further, in the sub-temperature rise period, PLC sampling furnace chamber temperature, the preset temperature corresponding with the sampling time compares, and the input group number according to comparative result adjustment heater strip guarantees to finish the intensification task of sub-temperature rise period on time.
Further, by PLC control automatic feed and discharging, make each charging identical with the door opened time of discharging process.
On the basis of the above, the present invention also provides a kind of aging treatment method of 7000 series alloys collision bumpers, and its treatment step is:
(a) the furnace chamber temperature was elevated to 85～110 ℃ of first aging temps in 1 hour;
(b) kept 8 hours;
(c) the furnace chamber temperature was elevated to 130～160 ℃ of second aging temps in 0.5 hour;
(d) keep 8 hours again;
In step (a) and (c), the input group number of PLC control heater strip by the principle that temperature rise rate reduces gradually, divides a plurality of subs that the furnace chamber temperature is risen to corresponding aging temp respectively;
In step (b) and (d), PLC is according to the furnace chamber variation of temperature, and the input group number of control heater strip and the On/Off of furnace chamber air suction inlet remain on corresponding aging temp with the furnace chamber temperature.
The present invention can be communicated with air suction inlet inside and outside the furnace chamber by the negative pressure end setting at the aging oven blower fan, and the On/Off by PLC control air suction inlet, adopt simultaneously plural groups independently heater strip as heating unit, input group number by PLC control heater strip, the two is in conjunction with the temperature that can effectively the solve holding stage problem of leaping high, and can reduce the fluctuating range of furnace chamber temperature greatly.
Because the temperature rise period is divided into a plural number temperature rise period, reduce gradually by the temperature rise rate of controlling each sub-temperature rise period on the one hand, temperature rise rate minimum when making near holding temperature, can effectively reduce and stop temperature after heating and leap high, on the other hand by controlling the heating-up time of each sub-temperature rise period, the tolerance range of heating-up time can be guaranteed, thereby the consistence of each batch products quality can be guaranteed.
The aging treatment method of the present invention's 7000 series alloys collision bumpers can make the product after the processing satisfy the specification of quality of collision bumper.
Description of drawings
Fig. 1 is the desirable Time-activity-curve figure of 7000 series alloys collision bumpers;
The interior temperature curve of furnace chamber that Fig. 2 records when adopting the actual ageing treatment of the inventive method.
Embodiment
The present invention will be further described below in conjunction with embodiment and accompanying drawing.
For satisfying the ageing treatment requirement of high-quality large-scale workpiece, the invention provides a kind of temperature-controlled process of aging oven, comprise: the heating unit of aging oven adopts independently heater strip of plural groups, and the air suction inlet inside and outside the negative pressure end setting of aging oven blower fan can be communicated with furnace chamber; In the temperature rise period, the input group number of PLC control heater strip by the principle that temperature rise rate reduces gradually, divides a plurality of subs that the furnace chamber temperature is risen to aging temp; At holding stage, PLC is according to the furnace chamber variation of temperature, and the input group number of control heater strip and the On/Off of described air suction inlet remain on aging temp with the furnace chamber temperature.
The group number of heater strip can be set to 4～10 groups usually, to satisfy the control to temperature rise rate.For example, the aging oven that adopts in the present invention's experiment is 480KW, and its heating unit adopts six groups of heater strips, and the power of every group of heater strip is 80KW.
In the sub-temperature rise period, PLC sampling furnace chamber temperature, the preset temperature corresponding with the sampling time compares, and the input group number according to comparative result adjustment heater strip guarantees to finish the intensification task of sub-temperature rise period on time.By this segmentation control method, can control the time of temperature rise period effectively, guarantee the consistence of each batch products.
By PLC control automatic feed and discharging, make each charging identical with the door opened time of discharging process, make product identical simultaneously, thereby further guaranteed the consistence of each batch products at residing time in furnace.
With reference to Fig. 1, the present invention's 7000 series alloys collision bumper aging treatment methods are divided into four-stage:
(a) the furnace chamber temperature was elevated to first aging temp in 1 hour, described first aging temp is 85～110 ℃;
(b) kept 8 hours;
(c) the furnace chamber temperature was elevated to second aging temp in 0.5 hour, described second aging temp is 130～160 ℃;
(d) keep 8 hours again;
In step (a) and (c), the input group number of PLC control heater strip by the principle that temperature rise rate reduces gradually, divides a plurality of subs that the furnace chamber temperature is risen to described first aging temp and second aging temp respectively;
In step (b) and (d), PLC is according to the furnace chamber variation of temperature, and the input group number of control heater strip and the state of furnace chamber air suction inlet remain on corresponding aging temp with the furnace chamber temperature.
In a kind of scheme preferably, described first aging temp is 90 ℃, described second aging temp is 137 ℃, step (a) was divided into less than 60 ℃, 60～80 ℃, 80～90 ℃ three sub-temperature rise periods, the furnace chamber temperature drops into four groups of 80KW heater strips less than 60 ℃ sub-temperature rise period, drop into three groups of 80KW heater strips from 60 ℃ to 80 ℃ sub-temperature rise period, drop into one group of 80KW heater strip from 80 ℃ to 90 ℃ sub-temperature rise period.
Step (c) is divided into 90～130 ℃, 130～137 ℃ two sub-temperature rise periods, drops into four groups of 80KW heater strips from 90 ℃ to 130 ℃ sub-temperature rise period, drops into three groups of 80KW heater strips from 130 ℃ to 137 ℃ sub-temperature rise period.
By controlling the group number of the heater strip that each sub-temperature rise period drops into, can control the temperature rise rate of each sub-temperature rise period, adopt this mode, can guarantee to be rapidly heated on the one hand, on the other hand can be so that temperature rise rate minimum during near holding temperature reduces producing the factor that temperature is leapt high when entering holding stage.
In the sub-temperature rise period, PLC sampling furnace chamber temperature, the preset temperature corresponding with the sampling time relatively, adjust the input group number of heater strip according to comparative result, promptly when being lower than preset temperature, sample temperature increases the input group number of heater strip, when sample temperature is higher than preset temperature, reduce the input group number of heater strip, guarantee to finish the intensification task of sub-temperature rise period on time.
In step (b) and (d), adopt following method control furnace chamber temperature: when the furnace chamber temperature is higher than 0.2 ℃ of corresponding aging temp, stop heating, when dropping to, the furnace chamber temperature begins heating when being higher than 0.1 ℃ of corresponding aging temp, when the furnace chamber temperature is higher than 3.0 ℃ of corresponding aging temps, open the air suction inlet, close the air suction inlet when being higher than 2.5 ℃ of corresponding aging temps when the furnace chamber temperature drops to.
In this aging treatment method,, make each charging identical, make product identical simultaneously, thereby can further guarantee the consistence of each batch products at residing time in furnace with the door opened time of discharging process by PLC control automatic feed and discharging.Described air suction inlet is arranged on the negative pressure end of aging oven blower fan, by PLC control On/Off.The sampling of temperature and control accuracy are 0.1 ℃.Figure 2 shows that the temperature curve that adopts a plurality of test point in the furnace chamber that present method records 7000 series alloys collision bumper ageing treatment, the product after the timeliness is qualified fully after testing.
This aging treatment method efficiently solves the problem that the holding stage temperature is leapt high and temperature fluctuation is bigger, the factors such as season, environment, loading capacity, switch fire door that solved cause inconsistent problem of heating-up time, can handle the large product that quality is had relatively high expectations.Whole ag(e)ing process realizes the level of automation height automatically by PLC control simultaneously.
Claims (9)
1. the temperature-controlled process of an aging oven comprises:
The heating unit of aging oven adopts independently heater strip of plural groups, and the air suction inlet inside and outside the negative pressure end setting of aging oven blower fan can be communicated with furnace chamber;
In the temperature rise period, the input group number of PLC control heater strip by the principle that temperature rise rate reduces gradually, divides a plurality of subs that the furnace chamber temperature is risen to aging temp;
At holding stage, PLC is according to the furnace chamber variation of temperature, and the input group number of control heater strip and the On/Off of described air suction inlet remain on aging temp with the furnace chamber temperature.
2. temperature-controlled process according to claim 1, it is characterized in that: in the sub-temperature rise period, PLC sampling furnace chamber temperature, the preset temperature corresponding with the sampling time is relatively, input group number according to comparative result adjustment heater strip guarantees to finish the intensification task of sub-temperature rise period on time.
3. temperature-controlled process according to claim 1 is characterized in that: by PLC control automatic feed and discharging, make each charging identical with the door opened time of discharging process.
4. the aging treatment method of a series alloys collision bumper is characterized in that, treatment step is:
(a) the furnace chamber temperature was elevated to 85～110 ℃ of first aging temps in 1 hour;
(b) kept 8 hours;
(c) the furnace chamber temperature was elevated to 130～160 ℃ of second aging temps in 0.5 hour;
(d) keep 8 hours again;
In step (a) and (c), the input group number of PLC control heater strip by the principle that temperature rise rate reduces gradually, divides a plurality of subs that the furnace chamber temperature is risen to corresponding aging temp respectively;
In step (b) and (d), PLC is according to the furnace chamber variation of temperature, and the input group number of control heater strip and the On/Off of furnace chamber air suction inlet remain on corresponding aging temp with the furnace chamber temperature.
5. aging treatment method according to claim 4 is characterized in that: described first aging temp is 90 ℃, and described second aging temp is 137 ℃,
Step (a) was divided into less than 60 ℃, 60～80 ℃, 80～90 ℃ three sub-temperature rise periods, corresponding four groups of 80KW heater strips, three groups of 80KW heater strips, one group of 80KW heater strip of dropping into;
Step (c) is divided into 90～130 ℃, 130～137 ℃ two sub-temperature rise periods, corresponding four groups of 80KW heater strips, three groups of 80KW heater strips of dropping into.
6. aging treatment method according to claim 5, it is characterized in that: in the sub-temperature rise period, PLC sampling furnace chamber temperature, the preset temperature corresponding with the sampling time is relatively, input group number according to comparative result adjustment heater strip guarantees to finish the intensification task of sub-temperature rise period on time.
7. aging treatment method according to claim 4 is characterized in that: by PLC control automatic feed and discharging, make each charging identical with the door opened time of discharging process.
8. aging treatment method according to claim 4, it is characterized in that: and (d) in step (b), when the furnace chamber temperature is higher than 0.2 ℃ of corresponding aging temp, stop heating, when dropping to, the furnace chamber temperature begins heating when being higher than 0.1 ℃ of corresponding aging temp, when the furnace chamber temperature is higher than 3.0 ℃ of corresponding aging temps, open the air suction inlet, close the air suction inlet when being higher than 2.5 ℃ of corresponding aging temps when the furnace chamber temperature drops to.
9. aging treatment method according to claim 4 is characterized in that: described air suction inlet is arranged on the negative pressure end of aging oven blower fan, by PLC control On/Off.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010507159 CN101948989A (en) | 2010-10-14 | 2010-10-14 | Aging treatment method and temperature control method for aluminum alloy bumpers |
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| CN 201010507159 CN101948989A (en) | 2010-10-14 | 2010-10-14 | Aging treatment method and temperature control method for aluminum alloy bumpers |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104071106A (en) * | 2014-07-22 | 2014-10-01 | 辽宁忠旺集团有限公司 | Production technology for aluminium alloy bumper for automobiles |
| CN109334413A (en) * | 2018-08-21 | 2019-02-15 | 靖江市新程汽车零部件有限公司 | Car front/rear door Novel crashproof bar |
| CN111218628A (en) * | 2020-02-14 | 2020-06-02 | 四川福蓉科技股份公司 | Control mode for satisfying aging heating of 7-series aluminum alloy |
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| CN2070892U (en) * | 1989-12-29 | 1991-02-06 | 北京重型电机厂 | Power changeable case type electric resistance stove |
| CN201144255Y (en) * | 2007-12-14 | 2008-11-05 | 李传斌 | Circulation controllable wind cooling device for isothermal normalizing furnace |
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2010
- 2010-10-14 CN CN 201010507159 patent/CN101948989A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2070892U (en) * | 1989-12-29 | 1991-02-06 | 北京重型电机厂 | Power changeable case type electric resistance stove |
| CN201144255Y (en) * | 2007-12-14 | 2008-11-05 | 李传斌 | Circulation controllable wind cooling device for isothermal normalizing furnace |
Non-Patent Citations (1)
| Title |
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| 《材料热处理学报》 20070831 戴晓元 固溶处理及时效对7xxx铝合金组织与性能的影响 第28卷, 第4期 2 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104071106A (en) * | 2014-07-22 | 2014-10-01 | 辽宁忠旺集团有限公司 | Production technology for aluminium alloy bumper for automobiles |
| CN104071106B (en) * | 2014-07-22 | 2016-03-23 | 辽宁忠旺集团有限公司 | The production technology of automobile aluminium alloy bumper |
| CN109334413A (en) * | 2018-08-21 | 2019-02-15 | 靖江市新程汽车零部件有限公司 | Car front/rear door Novel crashproof bar |
| CN111218628A (en) * | 2020-02-14 | 2020-06-02 | 四川福蓉科技股份公司 | Control mode for satisfying aging heating of 7-series aluminum alloy |
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Application publication date: 20110119 |