CN112629707A - Heating furnace system precision testing method - Google Patents
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- 238000012360 testing method Methods 0.000 title claims abstract description 151
- 238000010438 heat treatment Methods 0.000 title claims abstract description 109
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000009434 installation Methods 0.000 claims abstract description 10
- 238000010998 test method Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 229910052573 porcelain Inorganic materials 0.000 abstract description 18
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
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Abstract
The invention provides a heating furnace system precision test method, which comprises a data test acquisition device, a detection thermocouple and a compensation lead, and adopts the steps of equipment installation, data recording, unqualified treatment and the like, and simultaneously, a 5-core porcelain tube is used in a heating furnace for installing a test thermocouple and a control thermocouple. By implementing the invention, the error ranges of a key temperature control system and a recording system can be controlled, the stable work of the heating furnace is ensured, a 5-core porcelain tube is used, a test thermocouple and a control thermocouple can be simultaneously arranged on one porcelain tube, the system precision test is carried out during production, the work convenience is improved, the test time and the cost are greatly saved, and the convenience of the system precision test is improved, the 5-core porcelain tube test thermocouple is directly inserted into the bottom from the inner porcelain tube of the control/recording thermocouple, the tail end distance is ensured to be less than 76mm, and the test accuracy can be improved.
Description
Technical Field
The invention belongs to the technical field of testing, and particularly relates to a method for testing the precision of a heating furnace system.
Background
Currently, in the process of performing aviation standard to manufacture products, manufacturing equipment often needs to meet relevant standards based on the requirement of product manufacturing accuracy, and in these standards, a system accuracy test (abbreviated as SAT) needs to be performed periodically to ensure the stability of equipment cycle production, and in the process of performing the system accuracy test, the SAT sensor terminal (temperature measuring end) needs to be as close to the terminal (temperature measuring end) of a control, monitoring or recording sensor as possible, the distance between the terminal and the terminal does not exceed 76mm (3 inches), and the subsequent test should place the test sensor at the same position and depth as the previous time. In the precision test of the heating furnace system, once the system precision test method is inaccurate, the whole production process record is affected, and the stability of the furnace and various performances of the produced products cannot be better ensured.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for testing the precision of a heating furnace system.
The invention is realized by the following technical scheme.
The invention provides a precision testing method of a heating furnace system, which comprises a data testing and collecting device, a detection thermocouple and a compensation lead, and comprises the following steps:
step one, setting a test temperature within the working temperature range of a heating furnace, and then inserting the detection end of a detection thermocouple into a temperature measurement hole of the heating furnace to control the distance between the detection end of the detection thermocouple and the hot end of the measured thermocouple in the furnace to be within 76 mm;
connecting the compensation lead with the detection thermocouple and the data test acquisition device;
step three, opening the heating furnace for heating, enabling the temperature of the heating furnace to enter a set test temperature range, opening the data test acquisition device for testing after the heating furnace is in a thermal stability state, and simultaneously recording the temperature control system of the heating furnace and related data of the data test acquisition device;
step four, after the data recording is completed, judging whether the heating furnace system is qualified, if so, sticking a qualified label to the heating furnace which is qualified in the test and issuing a related test report, and if not, entering a normal production flow, finishing the test, and entering the next step;
step five, detecting various instrument devices or devices used in the testing process, if the problems of the devices or the devices are found, replacing or repairing the devices or the devices, and then detecting the devices or the devices again until the heating furnace system is detected to be qualified, pasting qualified labels on the heating furnace which is tested to be qualified, issuing related test reports, enabling the heating furnace to enter a normal production flow, and ending the test; if the problems of various instrument devices used in the test process are not found and the test is not qualified, entering the next step;
step six, immediately notifying the product quality department of the unqualified test result, and respectively processing according to the following conditions:
regarding the temperature field of the effective area of the whole heating furnace, when the highest or lowest temperature caused by the precision test of the heating furnace system does not exceed the temperature range allowed by the process or material specification, the product performance is considered to be not influenced;
if the unqualified heating furnace system precision test leads the temperature of the effective area temperature field of the heating furnace to exceed the temperature limit range allowed by the process or material specification, a product quality department checks the parts processed by the equipment since the last test is qualified according to the non-conforming item control program, informs relevant customers and further evaluates the affected parts.
Further, when the set test temperature of the heating furnace is set in the step one, if the levels of different temperature sections of the heating furnace are not consistent, the system precision should be tested according to the temperature section with the highest level.
Further, in the third step, the criterion for determining that the heating furnace enters the thermal stability state is as follows: the temperature fluctuation was less than 1.5 ℃ in 15 minutes.
Furthermore, in the sixth step, when it is determined that the highest or lowest point temperature caused by the failure of the accuracy test of the heating furnace system does not exceed the temperature range allowed by the process or material specification, the determination is performed in combination with a temperature uniformity report (TUS), and when the temperature uniformity report (TUS) passes and the highest or lowest point temperature caused by the failure of the accuracy test of the heating furnace system does not exceed the temperature range allowed by the process or material specification, the product performance is considered to be not affected, and the heating furnace can be used.
Further, the method comprises the step of calculating the system precision, wherein the system precision is calculated by taking the method I in the table 6 in the AMS2750E as a standard, and the difference value between the result of the standard galvanic couple test and the result recorded and displayed by the data test acquisition device is calculated to obtain the precision error of the whole recording system; and calculating the difference value of the result of the standard galvanic couple test and the result displayed by the control instrument of the heating furnace to obtain the precision error of the whole control system.
Furthermore, the system accuracy of each temperature control system of the heating furnace and each channel of the recorder must be measured separately.
Furthermore, a 5-core ceramic tube is arranged in the heating furnace, wherein four core holes are used for installing a control couple of the heating furnace, one core hole used for installing a detection couple is uniformly surrounded in the heating furnace, the distance between the control couple installation core hole and the detection couple installation core hole meets the requirement of the distance between a control couple and a detection couple for system precision testing, and when the precision of the heating furnace system is tested, the testing detection couple is installed in the detection couple installation hole of the 5-core ceramic tube.
The invention has the beneficial effects that:
1. by implementing the testing method, the error ranges of the key temperature control system and the recording system can be controlled, and the working stability of the heating furnace is ensured.
2. The 5-core porcelain tube is used, the test galvanic couple and the control galvanic couple can be simultaneously installed on one porcelain tube, the system precision test can be carried out during production, the working convenience is improved, the test time and the cost are greatly saved, and the convenience of the system precision test is improved.
3. When the equipment is improved, the original old equipment blocks the old temperature measuring hole, so that the heat insulation performance of the furnace body can be improved.
4. The 5-core porcelain tube is installed without additionally opening a test hole, so that a furnace body is not damaged, and the service life of equipment is prolonged.
5. The 5-core porcelain tube test thermocouple is directly inserted into the bottom from the inner porcelain tube of the control/recording thermocouple, so that the tail end distance is ensured to be less than 76mm and is very close to the tail end distance, and the test accuracy can be improved.
6. The good leakproofness of furnace body can reduce field test personnel's safe operation risk, prevents scalding etc..
Drawings
FIG. 1 is a schematic diagram showing the relative position relationship between a control couple and a detection couple in a heating furnace when the present invention is used for the precision detection of a heating furnace system.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A precision test method for a heating furnace system comprises a data test acquisition device, a detection thermocouple and a compensation lead, and comprises the following steps:
step one, setting a test temperature within the working temperature range of a heating furnace, and then inserting the detection end of a detection thermocouple into a temperature measurement hole of the heating furnace to control the distance between the detection end of the detection thermocouple and the hot end of the measured thermocouple in the furnace to be within 76 mm;
connecting the compensation lead with the detection thermocouple and the data test acquisition device;
step three, opening the heating furnace for heating, enabling the temperature of the heating furnace to enter a set test temperature range, opening the data test acquisition device for testing after the heating furnace is in a thermal stability state, and simultaneously recording the temperature control system of the heating furnace and related data of the data test acquisition device;
step four, after the data recording is completed, judging whether the heating furnace system is qualified, if so, sticking a qualified label to the heating furnace which is qualified in the test and issuing a related test report, and if not, entering a normal production flow, finishing the test, and entering the next step;
step five, detecting various instrument devices or devices used in the testing process, if the problems of the devices or the devices are found, replacing or repairing the devices or the devices, and then detecting the devices or the devices again until the heating furnace system is detected to be qualified, pasting qualified labels on the heating furnace which is tested to be qualified, issuing related test reports, enabling the heating furnace to enter a normal production flow, and ending the test; if the problems of various instrument devices used in the test process are not found and the test is not qualified, entering the next step;
step six, immediately notifying the product quality department of the unqualified test result, and respectively processing according to the following conditions:
regarding the temperature field of the effective area of the whole heating furnace, when the highest or lowest temperature caused by the precision test of the heating furnace system does not exceed the temperature range allowed by the process or material specification, the product performance is considered to be not influenced;
if the unqualified heating furnace system precision test leads the temperature of the effective area temperature field of the heating furnace to exceed the temperature limit range allowed by the process or material specification, a product quality department checks the parts processed by the equipment since the last test is qualified according to the non-conforming item control program, informs relevant customers and further evaluates the affected parts.
Further, when the set test temperature of the heating furnace is set in the step one, if the levels of different temperature sections of the heating furnace are not consistent, the system precision should be tested according to the temperature section with the highest level.
Further, in the third step, the criterion for determining that the heating furnace enters the thermal stability state is as follows: the temperature fluctuation was less than 1.5 ℃ in 15 minutes.
Furthermore, in the sixth step, when it is determined that the highest or lowest point temperature caused by the failure of the accuracy test of the heating furnace system does not exceed the temperature range allowed by the process or material specification, the determination is performed in combination with a temperature uniformity report (TUS), and when the temperature uniformity report (TUS) passes and the highest or lowest point temperature caused by the failure of the accuracy test of the heating furnace system does not exceed the temperature range allowed by the process or material specification, the product performance is considered to be not affected, and the heating furnace can be used.
Further, the method comprises the step of calculating the system precision, wherein the system precision is calculated by taking the method I in the table 6 in the AMS2750E as a standard, and the difference value between the result of the standard galvanic couple test and the result recorded and displayed by the data test acquisition device is calculated to obtain the precision error of the whole recording system; and calculating the difference value of the result of the standard galvanic couple test and the result displayed by the control instrument of the heating furnace to obtain the precision error of the whole control system.
Furthermore, the system accuracy of each temperature control system of the heating furnace and each channel of the recorder must be measured separately.
Furthermore, a 5-core ceramic tube is arranged in the heating furnace, wherein four core holes are used for installing a control couple of the heating furnace, one core hole used for installing a detection couple is uniformly surrounded in the heating furnace, the distance between the control couple installation core hole and the detection couple installation core hole meets the requirement of the distance between a control couple and a detection couple for system precision testing, and when the precision of the heating furnace system is tested, the testing detection couple is installed in the detection couple installation hole of the 5-core ceramic tube.
The system precision test requirements related by the invention are as follows:
1. the instruments used for system precision calibration comprise a temperature test instrument or a temperature data acquisition instrument, a detection thermocouple, a compensation lead and the like.
2. A detection thermocouple and a compensation wire of a temperature test instrument or a temperature data acquisition instrument for system precision verification respectively meet the precision grade requirements specified by the latest version of AMS 2750. The use and verification of the thermocouple and the instrument are carried out according to the latest version of AMS2750 and Q/HY OD-02.14, and the recorder for recording the temperature of the disposable load couple is connected with a compensation lead used in production and checked during checking to perform checking as a whole.
3. In each control zone of the furnace, the SAT must be performed for the temperature control and recording system, and for the arrangement of the class B instruments, the SAT is also required for the load temperature recording system of each control zone.
4. When the disposable load couple is used, SAT direct detection is not required, but the load couple connected with the compensation lead and the calibration correction value of the recorder per quarter should be added with the load couple correction value and should be within the specified SAT precision range, otherwise, the SAT is not used. If the recorder or the galvanic couple of a different volume is replaced, the evaluation should be re-done.
5. The equipment should be re-checked for system accuracy after any overhaul has been performed that may affect SAT accuracy, including replacement of thermocouples, meters or compensation wires or meter adjustments, etc.
6. And (6) periodic checking. The furnace should be checked for system accuracy prior to first use, followed by periodic system accuracy checks (SAT) as per Table 1
Furnace class, instrument type and SAT test cycle requirement table
7. If the heating furnace is not used after the SAT is expired, the checking personnel should hang an equipment stop sign on the heating furnace, and must perform SAT checking before use.
The detailed system precision testing method comprises the following steps:
1. the system precision test can set a test temperature within the working temperature range of the heating furnace at will. The system precision can be carried out alone or in combination with production. If the grades of different temperature sections of the furnace are not consistent, the system precision is tested according to the temperature section of the most strict furnace grade.
2. During calibration, the hot end of the SAT test thermocouple is inserted into the temperature measuring hole, the measuring end of the test thermocouple is as close as possible to the hot end of the actual control and recording thermocouple, and the distance between the SAT test thermocouple and the hot end of the detected thermocouple is less than or equal to 76 mm.
3. The compensation wires are connected to the SAT thermocouple and the tester.
4. After the furnace is thermally stable (temperature fluctuations less than 1.5 ℃ over 15 minutes), the measurement can be made. At the moment when the temperature recorder prints the temperature number, the checker should read the temperature readings of the temperature test instrument and the temperature controller at the same time, and record the actual result. The system accuracy of each temperature control system of the heating furnace and each channel of the recorder must be measured separately.
5. And if the test is qualified, the SAT test report is issued according to the requirement. Temperature paper feed records should be attached to the report.
6. And (3) sticking labels to the furnace and the quenching tank which are qualified in the system precision test, wherein the labels comprise the furnace number, the current checking date and the next checking date, a system precision test report number and signature or seal of a tester.
7. SAT failure handling
(1) And if the SAT is unqualified, finding out the reason of the unqualified SAT, and simultaneously performing the re-check on the corresponding recorder, the controller, the alarm meter and the galvanic couple. The instrument is repaired, adjusted or the thermocouple is replaced or exchanged when necessary.
(2) The tester should immediately notify the quality department of the result of SAT test failure and process it according to the following conditions:
failure of the temperature control SAT, but not the resulting maximum or minimum temperatures exceeding the temperature range allowed by the process or material specifications (to be evaluated in conjunction with the furnace TUS report) for the entire furnace active area temperature field, was considered to have no effect on product performance.
If the SAT of the temperature control system fails to result in the temperature of the furnace active area exceeding the temperature limits allowed by the process or material specifications, the quality department should, according to the non-compliance control program Q/HY ODW-02.01, inventory, containment, notify the relevant customers of the parts processed by the equipment since the last time the SAT test passed, and wait for further evaluation of the affected parts.
At present, when the precision of a heating furnace system is detected, the field device adopts a double-core four-hole inner porcelain tube which is independent in control/record couple, a standard couple temperature measuring hole is additionally formed nearby and is communicated into a hearth, an independent protection tube is inserted into a fixed depth (the distance between the protection tube and the tail end of a tested couple is less than 76mm) during testing, and then an SAT test sensor is placed at the bottom of the protection tube. And (4) after the temperature is raised to the test temperature point, observing and recording the reading stably, comparing the reading with a control/recording instrument to obtain whether the test result is qualified, taking out the protection tube and the test couple after the test result is finished, and separately placing the protection tube and the test couple until the protection tube and the test couple are cooled.
After improvement, 5 core porcelain tubes with standard test thermocouple holes are used, original thermocouples of 4 hole porcelain tubes are connected into the 5 core porcelain tubes from 4 holes in the outer wall of the 5 core porcelain tubes, the middle holes are standard thermocouple test insertion holes, when a furnace is subjected to system precision test, a thermocouple protection cover is opened, then the standard thermocouples are inserted into the 5 core porcelain tube test holes, and the positions of the porcelain tubes extending into the tail end of a hearth are protected by sealed outer porcelain tubes, so that the test thermocouple insertion depth and the standard thermocouple insertion depth are in the same horizontal position.
Referring to the table 6 method I in the AMS2750E, the system precision calculation method calculates the difference between the result of the standard galvanic couple test and the result recorded and displayed by the field instrument to obtain the precision error of the whole recording system; and calculating the difference value of the result of the standard galvanic couple test and the result displayed by the field control instrument to obtain the precision error of the whole control system. Wherein the result of the standard galvanic couple test comprises the corrected values of the test instrument and the test galvanic couple.
Claims (7)
1. A precision test method for a heating furnace system comprises a data test acquisition device, a detection thermocouple and a compensation lead, and is characterized by mainly comprising the following steps:
step one, setting a test temperature within the working temperature range of a heating furnace, and then inserting the detection end of a detection thermocouple into a temperature measurement hole of the heating furnace to control the distance between the detection end of the detection thermocouple and the hot end of the measured thermocouple in the furnace to be within 76 mm;
connecting the compensation lead with the detection thermocouple and the data test acquisition device;
step three, opening the heating furnace for heating, enabling the temperature of the heating furnace to enter a set test temperature range, opening the data test acquisition device for testing after the heating furnace is in a thermal stability state, and simultaneously recording the temperature control system of the heating furnace and related data of the data test acquisition device;
step four, after the data recording is completed, judging whether the heating furnace system is qualified, if so, sticking a qualified label to the heating furnace which is qualified in the test and issuing a related test report, and if not, entering a normal production flow, finishing the test, and entering the next step;
step five, detecting various instrument devices or devices used in the testing process, if the problems of the devices or the devices are found, replacing or repairing the devices or the devices, and then detecting the devices or the devices again until the heating furnace system is detected to be qualified, pasting qualified labels on the heating furnace which is tested to be qualified, issuing related test reports, enabling the heating furnace to enter a normal production flow, and ending the test; if the problems of various instrument devices used in the test process are not found and the test is not qualified, entering the next step;
step six, immediately notifying the product quality department of the unqualified test result, and respectively processing according to the following conditions:
regarding the temperature field of the effective area of the whole heating furnace, when the highest or lowest temperature caused by the precision test of the heating furnace system does not exceed the temperature range allowed by the process or material specification, the product performance is considered to be not influenced;
if the unqualified heating furnace system precision test leads the temperature of the effective area temperature field of the heating furnace to exceed the temperature limit range allowed by the process or material specification, a product quality department checks the parts processed by the equipment since the last test is qualified according to the non-conforming item control program, informs relevant customers and further evaluates the affected parts.
2. The heating furnace system accuracy testing method according to claim 1, characterized in that: when the set test temperature of the heating furnace is set in the first step, if the grades of different temperature sections of the heating furnace are not consistent, the system precision is tested according to the temperature section with the highest grade.
3. The heating furnace system accuracy testing method according to claim 1, characterized in that: in the third step, the determination criteria for the heating furnace to enter the thermal stable state are as follows: the temperature fluctuation was less than 1.5 ℃ in 15 minutes.
4. The heating furnace system accuracy testing method according to claim 1, characterized in that: in the sixth step, when the highest or lowest point temperature caused by the unqualified precision test of the heating furnace system is judged not to exceed the temperature range allowed by the process or material specification, the highest or lowest point temperature is further combined with a temperature uniformity report (TUS), and when the temperature uniformity report (TUS) passes and the highest or lowest point temperature caused by the unqualified precision test of the heating furnace system does not exceed the temperature range allowed by the process or material specification, the product performance is considered not influenced, and the heating furnace can be used.
5. The heating furnace system accuracy testing method according to claim 1, characterized in that: calculating the system precision, wherein the system precision is calculated by taking the table 6 method I in AMS2750E as a standard, and performing difference calculation on the result of the standard galvanic couple test and the result recorded and displayed by the data test acquisition device to obtain the precision error of the whole recording system; and calculating the difference value of the result of the standard galvanic couple test and the result displayed by the control instrument of the heating furnace to obtain the precision error of the whole control system.
6. The heating furnace system accuracy testing method according to claim 1, characterized in that: the system accuracy of each temperature control system of the heating furnace and each channel of the recorder needs to be measured independently.
7. The heating furnace system accuracy testing method according to claim 1, characterized in that: the heating furnace is internally provided with a 5-core ceramic tube, wherein four core holes are used for installing a control couple of the heating furnace, one core hole used for installing a detection couple is uniformly surrounded in the heating furnace, the distance between the control couple installation core hole and the detection couple installation core hole meets the requirement of the distance between the control couple and the detection couple for system precision testing, and when the precision testing of the heating furnace system is carried out, the testing detection couple is installed in the detection couple installation hole of the 5-core ceramic tube.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505725A (en) * | 2022-09-24 | 2022-12-23 | 中国航空工业标准件制造有限责任公司 | Furnace temperature control method for aviation small part heat treatment process test |
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| CN111649834A (en) * | 2020-07-29 | 2020-09-11 | 河南省计量科学研究院 | High-temperature heating furnace temperature sensor point distribution device and metering calibration method thereof |
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| JPH10111188A (en) * | 1996-10-08 | 1998-04-28 | Shimazu Kinzoku Kk | Automatic thermocouple calibration device |
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| CN115505725A (en) * | 2022-09-24 | 2022-12-23 | 中国航空工业标准件制造有限责任公司 | Furnace temperature control method for aviation small part heat treatment process test |
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Application publication date: 20210409 |