CN-121977362-A - System and method for monitoring and controlling temperature and strain in ceramic mold roasting process

CN121977362ACN 121977362 ACN121977362 ACN 121977362ACN-121977362-A

Abstract

The invention belongs to the technical field of ceramic mold roasting technology and control, and particularly relates to a ceramic mold roasting process temperature and strain monitoring and controlling system and method. The detection regulation system comprises a temperature monitoring device, a strain monitoring device, a temperature regulation device and a core controller, wherein the temperature monitoring device is used for measuring deformation of a ceramic temperature measuring ring to obtain the temperature of a ceramic casting mold, the stress monitoring device is used for monitoring the stress of the ceramic casting mold, the temperature regulation device is arranged in a roasting furnace body and used for regulating the temperature in the roasting furnace body, and the core controller is respectively connected with the temperature monitoring device, the stress monitoring device and the temperature regulation device and used for obtaining the temperature and the stress parameters of the ceramic casting mold in real time and regulating the working state of the temperature regulation device according to the temperature and the stress parameters. The system can optimize heat supply and cooling strategies, thereby effectively improving the quality of ceramic casting molds and improving the production efficiency.

Inventors

XU QINGYAN
YAN XUEWEI
Liu Shanxiu
YANG QIHANG

Assignees

清华大学

Dates

Publication Date: 20260505
Application Date: 20251226

Claims (10)

1. The utility model provides a ceramic mold roasting process temperature and monitoring regulation and control system of meeting an emergency, is applied to the roasting furnace body, characterized in that includes: The temperature monitoring device comprises a ceramic temperature measuring ring array arranged on the ceramic casting mold and a laser micrometer array arranged on the roasting furnace body, wherein the laser micrometer is used for measuring the deformation of the ceramic temperature measuring ring so as to obtain the temperature of the ceramic casting mold; the stress monitoring device comprises a metal strain gauge array and a ceramic film strain gauge array which are arranged on the ceramic casting mold and is used for monitoring the stress of the ceramic casting mold; The temperature regulating device is arranged in the roasting furnace body and used for regulating the temperature in the roasting furnace body; The core controller is respectively connected with the temperature monitoring device, the stress monitoring device and the temperature regulating device, and is used for acquiring the temperature and the stress parameters of the ceramic casting mold in real time and regulating the working state of the temperature regulating device according to the temperature and the stress parameters.
2. The ceramic mold firing process temperature and strain monitoring and control system according to claim 1, wherein the laser micrometer array is arranged on the top and/or the side wall of the firing furnace body, and the measuring laser beam emitted by the laser micrometer is directed at least to the surface of one of the ceramic temperature measuring rings.
3. The ceramic mold firing process temperature and strain monitoring and control system according to claim 2, wherein the laser micrometer comprises an infrared semiconductor laser operating in a multichannel time division multiplexing mode with a single point scanning frequency of not less than 100Hz and a data update frequency of not less than 20Hz for each individual measurement channel.
4. The ceramic mold roasting process temperature and strain monitoring and controlling system according to claim 1 or 2, wherein the ceramic temperature measuring ring is a torus, the outer diameter is 30-60 mm, the inner diameter is 20-40 mm, the thickness is 5-15 mm, and the dimensional tolerance is +/-0.1 mm.
5. The system for monitoring and controlling the temperature and the strain of the ceramic casting mold according to claim 4, wherein the measurement precision of the laser micrometer is + -0.2-2 μm, and the equivalent temperature resolution of the ceramic temperature measuring ring is + -1.5 ℃.
6. The ceramic mold roasting process temperature and strain monitoring and controlling system according to claim 1, wherein the metal strain gauge comprises a first substrate layer, a first insulating layer, a first resistance layer and a first protection layer which are sequentially stacked, wherein the first substrate layer is a nichrome layer, and the first insulating layer is an alumina ceramic layer; And/or, the ceramic film strain gauge comprises a second substrate layer, a second insulating layer, a second resistance layer and a second protection layer which are sequentially stacked, wherein the second substrate layer is an alumina ceramic layer, and the second insulating layer comprises an alumina layer and a plasma spraying CeYSZ layer which are sequentially stacked.
7. The ceramic mold firing process temperature and strain monitoring and control system according to claim 6, wherein the thickness of the first base layer is 0.01-0.1 mm, the thickness of the first insulating layer is 20-100 μm, the porosity is less than 5%, the thickness of the second base layer is 0.1-0.3 mm, the thickness of the alumina layer of the second insulating layer is 2-4 μm, the thickness of the plasma sprayed CeYSZ layer of the second insulating layer is 20-60 μm, the porosity is less than 5%, and/or The metal strain gauge and the ceramic film strain gauge are fixed on the surface of the ceramic casting mold through a vacuum brazing process, a high-temperature sintering process, a sealing glass layer process or a ceramic spraying process.
8. The system according to claim 1, wherein the temperature control device comprises a heating device and a cooling device, the heating device is an electric heating device or a gas heating device, and the cooling device is an air cooling device.
9. The ceramic mold firing process temperature and strain monitoring and control system of claim 1, further comprising a safety protection device electrically connected to the core controller, the safety protection device comprising a safety relay and an explosion-proof audible and visual alarm.
10. A method for monitoring and controlling the temperature and strain of a ceramic casting mold in a roasting process, which is characterized by being realized based on the monitoring and controlling system according to any one of claims 1-9, and comprising the following steps: The core controller acquires temperature data of the temperature monitoring device and stress data of the stress monitoring device in real time and generates a real-time updated thermal stress cloud picture; and the core controller compares the generated thermal stress cloud image with pre-stored data, and indicates the temperature regulating device to regulate the temperature of the ceramic casting mold based on a comparison result.

Description

System and method for monitoring and controlling temperature and strain in ceramic mold roasting process Technical Field The invention belongs to the technical field of casting mold roasting technology and control, and particularly relates to a ceramic casting mold roasting process temperature and strain monitoring and controlling system and method. Background In the roasting process of ceramic shells and cores, accurate monitoring and regulation of temperature and stress have important influence on the performance of the final product. In the traditional process, the temperature distribution in the roasting furnace is mainly reflected indirectly by the temperature measuring ring, but the obtained data are all off-line data because the temperature measuring ring needs to be subjected to measurement deformation after roasting is completed, the temperature change in the roasting furnace is difficult to reflect in real time, the process adjustment is delayed, the real-time fluctuation and the local abnormal condition of the temperature of the roasting furnace cannot be effectively treated, and the local overheating or the overlarge temperature gradient can be caused to influence the roasting quality and the production efficiency of the product. The non-contact temperature measuring device such as a thermal infrared imager can realize real-time temperature measurement, but is limited by uncertainty of the emissivity of the ceramic surface and complicated heat exchange in the roasting furnace, and the measurement error can reach +/-20 ℃. In addition, the problem of sensor performance attenuation in a high-temperature environment also commonly exists, the working stability of the traditional sensor is suddenly reduced above 1200 ℃, frequent replacement or correction is needed, and the production cost and the maintenance difficulty are greatly increased. In the aspect of stress deformation test, the fiber grating sensor widely adopted in the prior art has high precision of micro-strain level, but needs to be adapted to high-temperature environment and adopts a sapphire coating, so that the cost of a single point is greatly improved, and the fiber grating sensor is easy to drift and is difficult to ensure in stability under the long-term high-temperature effect. On the other hand, the adhesive type resistance strain gauge is fixed by adopting a traditional adhesive, so that signal drift or distortion is easily caused by carbonization of the adhesive under a high-temperature condition, and a real-time monitoring result is unreliable. Based on the above reasons, the conventional roasting furnace generally adopts a fixed temperature control curve, and the conventional method cannot be adjusted in real time according to the temperature field change in the actual roasting process, so that the process parameters are always in a preset state, and complex heat exchange and local temperature fluctuation in the roasting furnace cannot be dealt with. In addition, when temperature unevenness or sudden hot spots occur in the roasting furnace, large uneven stress is generated by thermal expansion and shrinkage of the material, so that the cracking problem of the ceramic casting mold is caused. Accordingly, the present invention has been made in view of the above-mentioned drawbacks. Disclosure of Invention The invention aims to provide a system and a method for monitoring and controlling the temperature and the strain of a ceramic casting mold in the roasting process so as to at least partially solve the technical problems. The first aspect of the invention provides a system for monitoring and controlling the temperature and the strain in the ceramic casting mold roasting process, which is applied to a roasting furnace body and comprises the following components: The temperature monitoring device comprises a ceramic temperature measuring ring array arranged on the ceramic casting mold and a laser micrometer array arranged on the roasting furnace body, wherein the laser micrometer is used for measuring the deformation of the ceramic temperature measuring ring so as to obtain the temperature of the ceramic casting mold; the stress monitoring device comprises a metal strain gauge array and a ceramic film strain gauge array which are arranged on the ceramic casting mold and is used for monitoring the stress of the ceramic casting mold; The temperature regulating device is arranged in the roasting furnace body and used for regulating the temperature in the roasting furnace body; The core controller is respectively connected with the temperature monitoring device, the stress monitoring device and the temperature regulating device, and is used for acquiring the temperature and the stress parameters of the ceramic casting mold in real time and regulating the working state of the temperature regulating device according to the temperature and the stress parameters. The system for monitoring and controlling the temperature and the strain i