Resistance type heat treatment furnace temperature performance detection method

Abstract

The invention discloses a method for detecting furnace temperature performance of a resistance-type heat treatment furnace, and belongs to the field of furnace temperature performance of heat treatment furnaces. From effective space size measurement and volume calculation of a hearth of the resistance-type heat treatment furnace to determination of the number of measuring points, a position distribution diagram of test points in an effective heating area of the heat treatment furnace is drawn; and inserting a proper heat sensor from the top or the side surface of the heat treatment furnace to a measuring point position, and finally connecting the reference end of the heat sensor into test equipment to collect data. The resistance-type heat treatment furnace temperature performance testing process is optimized, resistance-type heat treatment furnace temperature performance detection data are more accurate and stable, meanwhile, the detection time is shortened, and the production efficiency of customers and the product quality are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of furnace temperature performance of heat treatment furnace, and particularly relates to a furnace temperature performance detection method of resistance type heat treatment furnace. BACKGROUND

[0002] The resistance type heat treatment furnace converts electric energy into heat energy through resistance heating elements for heat treatment of workpieces. The furnace temperature performance directly affects the quality of workpiece heat treatment, such as hardness, wear resistance, etc. In actual application, the performance indicators such as uniformity of furnace temperature and temperature control accuracy are crucial. If the furnace temperature is not uniform, the heat treatment effect of different parts of the workpiece may be different, affecting the overall performance; and insufficient temperature control accuracy may cause the heat treatment process parameters to deviate from the set value, and the expected effect cannot be achieved. With the improvement of the quality requirements of industrial production on workpieces and the continuous development of heat treatment process, regular testing of the furnace temperature performance of the resistance type heat treatment furnace to ensure that it meets the production needs has become an important link. SUMMARY

[0003] The purpose of the application is to optimize the furnace temperature performance test process of the resistance type heat treatment furnace to realize the accuracy and stability of the furnace temperature performance detection of the resistance type heat treatment furnace, shorten the detection time, and improve the production efficiency and product quality of customers.

[0004] In order to achieve the above purpose, the application provides the following technical scheme: A furnace temperature performance detection method of resistance type heat treatment furnace, comprising the following steps: S1: calculating the effective heating zone volume according to the effective space size of the heat treatment furnace, and determining the number of measurement points according to the effective heating zone volume; S2: drawing a test point position distribution map of the effective heating zone of the heat treatment furnace; S3: opening holes from the top or side of the heat treatment furnace, the size of the holes is determined by the diameter of the measurement sensor, and the position and number of the holes are determined by the test point position and the number of measurement points; S4: inserting the heat sensor into the measurement point position according to the number and position, and connecting the reference end to the test equipment; S5: detecting the temperature of the heat treatment furnace in real time and recording, and analyzing the uniformity of the furnace temperature of the heat treatment furnace.

[0005] In a preferred embodiment, in S1, the determination of the number of measurement points specifically comprises: measuring the size of the effective heating zone of the furnace to obtain the length, width and height of the effective heating zone, and calculating the volume of the effective heating zone, when measuring the effective space size of the heat treatment furnace, a certain space should be left with the four walls of the furnace to prevent short circuit caused by contact between the sensor and the resistance wire; According to the volume of the effective heating zone, the number of measurement points required is calculated according to the corresponding standards and requirements.

[0006] In a preferred embodiment, in S2, drawing a distribution map of the test points in the effective heating zone of the heat treatment furnace mainly includes: Test points should be placed at the center and eight corners of the effective heating zone; Confirm the number of temperature control zones in the heat treatment furnace, and at least one test point should be set up in each temperature control zone; Test points should be set up in key areas such as furnace door, furnace tail, and temperature control sensors; When drawing a map showing the distribution of test points, a three-dimensional grid should be created according to standards.

[0007] In a preferred embodiment, in S3, the requirements for the opening specifically include: The opening ensures that the thermal sensor can be easily inserted into the test point and fixed in place, and will not deform due to temperature changes, thus preventing the temperature measurement point from changing position. The openings do not affect the internal structure of the furnace or the furnace insulation effect; The diameter of the hole should be appropriate, just enough to accommodate the number of thermal sensors inserted, and should not be too large; The hole should be able to be easily closed; The number of holes should be reasonable and as few as possible.

[0008] In a preferred embodiment, in S4, the requirements for the layout and wiring specifically include: Choose the appropriate thermal sensor. Generally, use a resistance temperature detector (RTD) for temperatures below 300℃, a type K thermocouple for temperatures between 300℃ and 800℃, a type N thermocouple for temperatures between 800℃ and 1200℃, and a precious metal thermocouple for temperatures above 1200℃ and 1600℃. Before setting up testing sites, it is necessary to determine whether to conduct no-load or full-load tests. The hot end of the full-load test thermal sensor should be connected to the simulated workpiece, which should represent the thickness of the workpiece being processed in the furnace. When connecting sensors to measuring instruments, ensure that no additional thermoelectric potential or resistance is generated at the connection point.

[0009] The technical effects and advantages of the method for detecting the furnace temperature performance of a resistance heat treatment furnace according to the present invention are as follows: (1) The method for detecting the furnace temperature performance of a resistance heat treatment furnace of the present invention is to test the furnace top or side of the furnace chamber of the resistance heat treatment furnace without the need for a support or temperature measuring frame, thereby reducing the measurement time and measurement cost.

[0010] (2) The present invention inserts the thermal sensor into the furnace temperature measurement point by a direct insertion method. The position does not change during the heating process, and the measurement data is more accurate and reliable.

[0011] (3) This method optimizes the test process of the temperature performance of the resistance heat treatment furnace, making the test data of the temperature performance of the resistance heat treatment furnace more accurate and stable. Attached Figure Description

[0012] Figure 1 This is a flowchart of a method for detecting the furnace temperature performance of a resistance heat treatment furnace according to the present invention. Detailed Implementation

[0013] The technical solution of the present invention will be clearly and completely described below with reference to the flowchart.

[0014] S1: Calculate the volume of the effective heating zone based on the effective space dimensions of the furnace chamber of the resistance heat treatment furnace, and determine the number of measurement points required based on the volume of the effective heating zone; S2: Draw a distribution map of the test points in the effective heating zone of the heat treatment furnace; S3: Open a hole at a suitable position on the top or side of the heat treatment furnace. The size of the hole is determined by the diameter of the measuring sensor. The position and number of holes are determined by the position of the test point and the number of measurement points. S4: Insert the thermal sensors into the measurement points through the holes according to the number and position, and connect the reference end to the test equipment; S5: Real-time detection and recording of the temperature in the heat treatment furnace, and analysis of the temperature uniformity of the heat treatment furnace.

[0015] In step S1, the effective heating zone dimensions of the furnace must first be measured to obtain its length, width, and height. The volume of the effective heating zone is then calculated based on the measurement data. When measuring the effective space dimensions of the heat treatment furnace chamber, a certain amount of space should be left between the sensor and the four walls of the furnace chamber to prevent short circuits caused by contact between the sensor and the resistance wire inside the furnace chamber. Based on the volume of the effective heating zone, the required number of measurement points is calculated according to the type of heat treatment furnace and the corresponding standards and requirements.

[0016] In S2, when designing the test point location distribution map, test points should be arranged in the center of the effective heating zone and at the eight corners; and the number of temperature control zones of the heat treatment furnace should be confirmed according to the internal structure of the heat treatment furnace, with at least one test point arranged in each temperature control zone; test points should be arranged in key areas such as the furnace door, furnace tail, and near the temperature control sensor; the test point location distribution map should be drawn according to the standard three-dimensional grid diagram.

[0017] In S3, the holes made on the top or side of the heat treatment furnace must ensure that the heat sensor can be easily inserted into the test point and fixed in place, and that the temperature measurement point position will not change due to deformation caused by temperature changes. The position of the hole should not affect the internal structure of the furnace or the heat insulation effect of the furnace. The diameter of the hole should be moderate, just enough to accommodate the number of heat sensors inserted, and should not be too large. When not in use, the hole should be easy to close with a nut or other object. At the same time, the number of holes should be reasonable and as few as possible to avoid affecting the furnace structure.

[0018] In S4, the selection of thermal sensors should be based on the operating temperature of the heat treatment furnace and the temperature points to be measured. Generally, resistance temperature detectors (RTDs) are used below 300°C, K-type thermocouples are used from 300°C to 800°C, N-type or K-type thermocouples are used from 800°C to 1200°C, and precious metal thermocouples are used from 1200°C to 1600°C. Before the placement of the sensors, it is necessary to determine whether to perform no-load or full-load testing. If it is full-load testing, the hot end of the thermal sensor should be connected to the simulated workpiece, which should represent the thickness of the workpiece being processed in the furnace. When connecting the sensor to the measuring instrument, ensure that no additional thermoelectric potential or resistance is generated at the connection point.

[0019] In S5, the temperature of the heat treatment furnace is monitored and recorded in real time. Data required by the standard are collected at each set point temperature. The uniformity of the furnace temperature is analyzed based on the collected data to determine whether the heat treatment furnace meets the requirements.

[0020] The above description is merely a preferred embodiment of the present invention, and the technical solution of the present invention is not limited thereto. It should be noted that, for those skilled in the art, under the technical teachings provided by the present invention and as common knowledge in the field, other equivalent modifications and improvements can be made, which should also be considered within the scope of protection of the present invention.

Claims

1. A method for detecting the temperature performance of a resistance heat treatment furnace, characterized by, The method comprises the following steps: S1: According to the effective space size of the furnace of the resistance heating treatment furnace, the volume of the effective heating zone is calculated, and the number of measuring points is determined according to the volume of the effective heating zone; S2: A distribution map of the test points in the effective heating zone of the heat treatment furnace is drawn; S3: A hole is opened from the top or side of the heat treatment furnace, the size of the hole is determined by the diameter of the measuring sensor, and the position and number of the hole are determined by the position of the test points and the number of measuring points; S4: The thermal sensor is inserted into the measuring point position from the hole in the determined number and position, and the reference end is connected to the test equipment; S5: The temperature of the heat treatment furnace is detected in real time, and the uniformity of the furnace temperature of the heat treatment furnace is recorded and analyzed.

2. The method of claim 1, wherein the method further comprises: In S1, the requirements for determining the number of measuring points include: The size of the effective heating zone of the furnace is measured to obtain the length, width and height of the effective heating zone, and the volume of the effective heating zone is calculated. When measuring the effective space size of the furnace, a certain space should be left from the four walls of the furnace to prevent short circuit caused by contact between the sensor and the resistance wire; According to the volume of the effective heating zone, the number of measuring points is calculated according to the corresponding standards and requirements.

3. The method of claim 2, wherein the method further comprises: In S2, the drawing of the distribution map of the test points in the effective heating zone of the heat treatment furnace mainly includes: The center and eight corners of the effective heating zone should be arranged with test points; The number of temperature control zones of the heat treatment furnace is confirmed, and at least one test point should be arranged in each temperature control zone; Test points should be arranged in key areas such as furnace door, furnace tail and temperature control sensor; The test point position distribution map should be drawn according to the standard three-dimensional grid map.

4. The method of claim 3, wherein the method further comprises: In S3, the requirements for the hole opening include: The hole ensures that the thermal sensor can be easily inserted into the test point position and can be fixed, and the temperature measuring point position will not change due to temperature change; The hole does not affect the internal structure of the furnace and the heat preservation effect of the furnace; The diameter of the hole should be moderate, which can just insert the number of thermal sensors, and cannot be too large; The hole can be easily closed when not in use; The number of holes should be reasonable and as few as possible.

5. The method of claim 4, wherein the method further comprises: In S4, the requirements for point arrangement and wiring include: Select a suitable thermal sensor, generally use a thermal resistance below 300℃, use a K-type thermocouple from 300℃ to 800℃, use an N-type thermocouple from 800℃ to 1200℃, and use a noble metal thermocouple above 1200℃ to 1600℃; Before arranging the points, it is necessary to determine whether to test under empty load or full load; The hot end of the thermal sensor should be connected to the simulated workpiece for full load test, and the simulated workpiece should represent the thickness of the workpiece processed in the furnace; When connecting the sensor with the measuring instrument, it is ensured that the connection end does not generate additional thermoelectric potential or resistance.

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