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 Posted: Thu 22:30, 09 Dec 2010 Post subject: tory burch From the temperature uniformity test to |
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From the temperature uniformity test to see improvements in the direction of HB5425-89
Significant changes. Into the thermostat, it should be at least 30rain collected sensor readings of all tests, a test of the question if the sensor reading that is slowly rising or slowly decline,[link widoczny dla zalogowanych], and may be beyond the tolerance range, the data acquisition time should be extended to continue observation, sure does not appear beyond the scope of the phenomenon of tolerance. Otherwise,[link widoczny dla zalogowanych], we think it should be adjusted for constant temperature equipment,[link widoczny dla zalogowanych], re-testing. HB5425-89 did not provide the appropriate determination methods, leaving many testers can not be right to judge, some of the stove may fail a test report issued by a qualified. Sensor data collected while the test response to the stove to control, record, monitor and record the load sensor readings to the stove the temperature inside and outside of state control, monitoring the temperature of the state and the load combined with a comprehensive evaluation of the stove. Can be used in subsequent use sensor readings on the stove the temperature inside the furnace to determine the appropriate range of state is to achieve the purpose of extending the test interval. 4, testing and other issues 1) non-heat treatment temperature test equipment, or whether it is HB5425-89 AMS2750 only used for heat treatment furnace temperature uniformity test is given to the technical requirements, for those who forged the former heating equipment (rotary hearth furnace, through furnace, preheating furnace, etc.) and used in casting as well as metallurgical roaster oven used in the experiment did not request such that many companies can only follow the personal opinions of technical personnel proposed the testing program and technical conditions, if outside in the heat treatment furnace,[link widoczny dla zalogowanych], the uniformity of the other uses the stove to set standards for testing, standardized production of thermal processing and improve product quality should be a lot of help. 2) control used on the stove, recording, monitoring, load and over-temperature sensors required is not detailed enough sensors for different functions should be different requirements, such as: control of the stability of the sensor should be examined as the main indicators, allowing the error and calibration cycle can be appropriate to relax, especially in the precious metal thermocouple (S or R sub-degree), its calibration results should be compared with the previous calibration results, if not very different, should be continued. If you replace the thermal characteristics of the new thermocouple more difference with the original thermocouple, the furnace temperature control for the impact will be greater. Almost all on the stove so that the characteristics of the sensor, the calibration of the thermocouple on the stove during the week the results of a data comparison is a good practice. 3) O 0 temperature uniformity test the tank for a protective atmosphere furnace, the test temperature uniformity will face this problem, set the temperature control instruments may not be that we need to test the temperature, and we need to test the tank temperature state. At this point, must be the temperature thermal processing requirements as the tank temperature, adjust the instrument so that the tank to control the temperature, and makes the test results meet the technical requirements. This point must be selected test temperature heat treatment required temperature point, but not by normal heat treatment furnace as to select the temperature interval of 150 ℃ point, because control instruments set the temperature and the temperature inside the tank so the gap is not necessarily a linear relationship. 4) The technical standards lag behind the needs of manufacturing and production equipment, equipment at the scene of the stove in a variety of instruments has been calibration is inevitable, the relevant technical standards is blank, measuring staff sometimes can only refer to existing test procedures in the field of instrument calibration. Although HB5425-89 has little to do, but you can see,[link widoczny dla zalogowanych], we are always lagging behind the technical standards for testing and calibration needs. 5 document management from our exposure to some of the military enterprises of view, the file management of the equipment there are many problems, and even some units only a simple accounting. For a heat treatment furnace, the device of all measuring instruments of various test certificates, calibration certificates, test reports must be well preserved, not only to prove that the current state of the stove, can also provide maintenance and repair data especially when the product quality problems, verify the traceability will definitely help. Stove in the system accuracy tests and temperature uniformity tests of the problems should also be kept in paper files, the file should also have given equipment preventive measures in order to reasonably reduce the frequency of second-class test. 6 Conclusion From the temperature uniformity of testing, we saw some of HB5425-89 deficiency, which also pointed out to us to improve the direction. New technical standards should draw more international standards, only with international standards, in close contact with the equipment to the operation of the officers have a stronger role in guiding. References [1] HB5425-1989, air district heat treating furnace parts determination [s] [2] AMS2750D, high temperature measurement method [s]
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