Device and method for testing service life of hard alloy guide for steel rolling

Abstract

The invention discloses equipment and a method for testing the service life of a hard alloy guide for steel rolling, and relates to the technical field of steel bar rolling. The equipment comprises a first bottom plate and a service life test module fixed on the first bottom plate. The service life testing module comprises a fixed base, a rotating shaft, a first heating unit, a plurality of second driving pieces and a detection head; the rotating shaft is in interference fit with a to-be-tested guide and guard workpiece, and a first driving piece is connected below; the first heating unit is embedded in the fixed base and is used for heating the guide and guard workpiece to be detected; the detection head is located in the fixed base, a roller structure is adopted, the rotating shaft direction is vertical, the second driving piece drives the detection head to apply axial pressure to the guide and guard workpiece to be detected, and the actual rolling working condition is simulated. The device can effectively simulate the working condition of steel rolling, and achieves the quick and accurate testing of the service life of the guide.

Description

Technical Field

[0001] The present invention relates to the technical field of steel bar rolling, and in particular to a device and method for testing the life of a hard alloy guide for steel rolling. Background Art

[0002] In the steel rolling production process, guides are key process components, mainly used for guiding and transporting steel bars under high temperature conditions. During the rolling process, the temperature of the steel bars can reach over 800°C, and the guides need to withstand harsh working conditions such as high temperature, high pressure and severe friction for a long time.

[0003] In actual production applications, there is a lack of life testing methods for guides and guards, and true performance feedback can usually only be obtained during field use. To continuously optimize the material formulation and production process of guide and guard products and extend their service life under high-temperature conditions, a dedicated test device that can accurately evaluate the life of guides and guards is urgently needed. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a life testing device and method for cemented carbide guides for steel rolling.

[0005] The technical solution adopted in the present invention is as follows: A life testing device for cemented carbide guides for steel rolling includes a life testing module, wherein the life testing module includes a vertically arranged rotating shaft for positioning and fixing a guide workpiece to be tested, the rotating shaft is connected to a first driving member, and the rotating shaft rotates under the action of the first driving member, and a first heating unit for heating the guide workpiece to be tested is provided on the outer outer side of the rotating shaft, and a plurality of detection heads for contacting the outer arc surface of the guide workpiece to be tested are evenly arranged on the circumferential outer side of the rotating shaft, and the detection heads are connected to a second driving member, and the detection heads approach or move away from the rotating shaft under the action of the second driving member.

[0006] During the life test, the guide workpiece to be tested is sleeved and installed on the rotating shaft. The rotating shaft drives the guide workpiece to be tested to rotate at high speed. The first heating unit continuously heats the guide workpiece to be tested. The electric push rod pushes the detection head to apply pressure to the high-speed rotating guide workpiece to be tested. The detection head fits the outer arc surface of the guide workpiece to be tested and rotates due to the influence of friction, thereby simulating the actual steel bar rolling process.

[0007] By observing the thermal cracks on the surface of the guide workpiece after the test, the material ratio and production process parameters of the guide can be scientifically adjusted. After repeated testing and verification, the most suitable guide carbide material can be determined, thereby significantly improving the production quality of the guide.

[0008] Preferably, the device also includes a first base plate, the life test module is fixed on the first base plate, and a guide induction heating module for preheating the guide workpiece to be tested is also fixed on the first base plate at a certain distance from the life test module. The inner diameter of the guide workpiece to be tested is increased after preheating, which is convenient for inserting into the rotating shaft; the guide induction heating module adopts a high-frequency induction coil to achieve rapid and uniform heating; the life test module is also fixed on the first base plate.

[0009] Preferably, the equipment also includes a guide loading module fixed on the first base plate and used to clamp the guide workpiece to be tested. The center positions of the life test module, the guide induction heating module and the guide loading module are located in the same straight line direction, which facilitates the transmission and positioning of the guide workpiece to be tested between the modules.

[0010] Preferably, the device also includes a grasping module, which includes an X-degree of freedom drive unit and two Z-degree of freedom drive units. Each Z-degree of freedom drive unit is equipped with a grasping clamp for clamping the guide. The driving direction of the X-degree of freedom drive unit is consistent with the arrangement direction of the life test module, the guide induction heating module and the guide feeding module. The driving direction of the Z-degree of freedom drive unit is vertical, and the two Z-degree of freedom drive units move synchronously. The grasping module is used to realize the fast and efficient transportation of the guide workpiece to be tested between the modules, thereby improving the test efficiency.

[0011] Preferably, the detection head is a roller with a vertical axis of rotation. The contact surface between the detection head and the guide workpiece to be measured is an arc surface, the curvature of the arc surface matches the outer arc surface of the guide workpiece to be measured, and the hardness of the detection head is lower than the hardness of the guide workpiece to be measured, simulating the hardness of the steel bars and the contact between the steel bars and the guide during actual steel rolling.

[0012] Preferably, the outer wall of the rotating shaft has an interference fit with the inner wall of the guide workpiece to be tested, and the thermal expansion coefficient of the rotating shaft is greater than the thermal expansion coefficient of the guide workpiece to be tested, thereby reducing the relative sliding between the guide workpiece to be tested and the rotating shaft during the test process, and also facilitating the loading and unloading of the guide workpiece to be tested by heating and cooling.

[0013] Preferably, the first driver is a motor, which provides rotational driving force to simulate the working state of the guide during the steel rolling process; the second driver is an electric push rod, which provides reciprocating driving force to simulate the pressure on the guide during the steel rolling process. Both are controlled by electrical signals to facilitate adjustment of the speed and thrust.

[0014] Preferably, the first heating unit is a high-frequency induction coil, and the inner diameter of the first heating unit is 2.29 to 2.50 times the outer diameter of the guide workpiece to be measured, so that the outer surface of the guide workpiece to be measured that contacts the detection head is more heated by the first heating unit than the inner surface, simulating actual working conditions.

[0015] Preferably, the life test module further comprises a fixed base for fixing the second driver and a second bottom plate for fixing the fixed base, providing a fixed support function.

[0016] Preferably, the outer diameter of the top end of the rotating shaft gradually decreases from bottom to top to facilitate the installation and positioning of the guide.

[0017] Another object of the present invention is to provide a testing method using the above-mentioned testing device, comprising the following steps: S1. The guide workpiece to be tested is set on the rotating shaft in the life test module; S2. The first driver drives the rotating shaft and the guide workpiece to be measured to rotate, and the second heating unit continues to heat the guide workpiece to be measured; S3. The second driver drives the detection head to be measured close to the guide workpiece and applies pressure, the detection head fits the outer curved surface of the guide workpiece to be measured and rotates under the action of friction; S4. After the test is completed, the first driver stops driving, the first heating unit stops heating, and the second driver drives the detection head to leave the guide workpiece to be measured; S5. Cool the guide workpiece to be tested and the rotating shaft in the life test module, and take out the guide workpiece to be tested.

[0018] Preferably, before step S1, the guide guard workpiece to be tested is preheated by the guide guard induction heating module, and the preheated guide guard workpiece to be tested is transferred to the life test module through the gripping module. The preheating step can facilitate the guide guard workpiece to be tested to be mounted on the rotating shaft.

[0019] The present invention applies pressure to the high-speed rotating guide workpiece to be tested through the detection head, simulating the rotation of the guide and the pressure of the steel on the guide during the actual rolling process; and performs high-frequency induction heating on the guide workpiece to be tested through the second heating unit, simulating the influence of thermal radiation and heat conduction of high-temperature steel on the guide during the actual rolling process; through the highly simulated multi-physical quantity simulation test environment and precisely controllable operating parameters, a high correlation between the test results and the actual workpiece life is ensured, thereby realizing accurate guide life detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a hard alloy guide life test device for steel rolling according to the present invention; Figure 2 It is a structural diagram of the grabbing module of the present invention; Figure 3 It is a structural diagram of the guide feeding module of the present invention; Figure 4 This is a top view of the guide and feeding module of the present invention; Figure 5 1 is a top view of the guide induction heating module of the present invention; Figure 6 It is a structural diagram of the life test module of the present invention; Figure 7 is a top view of the life test module of the present invention; Figure 8 It is a front view of the life test module of the present invention.

[0021] Figure numbers: 1-first base plate, 2-life test module, 3-guide induction heating module, 4-guide feeding module, 5-grabbing module, 6-electric control box; 201-second base plate, 202-fixed base, 203-first heating unit, 204-rotating shaft, 205-motor, 206-detection head, 207-electric push rod, 208-first input conduit, 209-first output conduit; 301-second heating unit, 302-second input conduit, 303-second output conduit; 401-first base, 402-first base fastening stud, 403-second base, 404-second base fastening stud, 405-third base, 406-clamping piece; 501-X degree of freedom drive unit, 502-Z degree of freedom drive unit, 503 grabber. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be noted that the terms "front", "up", "down", "left", "right", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0024] The following is combined with Figure 1-8 The present invention is further described.

[0025] like Figure 1 As shown, in order to conduct a high-temperature durability test on the life of the guide in the steel bar rolling process, the present invention proposes a carbide guide life testing device for steel rolling, including: a first base plate 1, a life testing module 2, a guide induction heating module 3, a guide feeding module 4, a grabbing module 5 and an electric control box 6.

[0026] The life test module 2, the guide induction heating module 3, the guide loading module 4, and the gripping module 5 are all fixedly mounted on the first base plate 1, and the electrical control box 6 is fixedly mounted below the first base plate 1. The life test module 2, the guide induction heating module 3, and the guide loading module 4 each have a central space for placing the guide workpiece to be tested. The central axes of the three modules are collinear, allowing the guide workpieces to be transported in the same linear direction within each module.

[0027] like Figure 2 As shown, the gripping module 5 includes a drive mechanism and two grippers 503. The drive mechanism includes an X-degree of freedom drive unit 501 and two Z-degree of freedom drive units 502. The two grippers 503 are respectively mounted on the two Z-degree of freedom drive units 502. The X-degree of freedom drive unit 501 is used to drive the two Z-degree of freedom drive units 502 to move synchronously in the horizontal X-axis direction, while the Z-degree of freedom drive units 502 are used to drive the two grippers 503 to move in the vertical direction. The X-axis direction is consistent with the arrangement direction of the life test module 2, the guide induction heating module 3, and the guide loading module 4.

[0028] like Figure 3 、 Figure 4 As shown, the guide loading module 4 includes a first base 401, a first base fastening stud 402, a second base 403, a second base fastening stud 404, and a third base 405. The first, second, and third bases 401, 403, 405 are stacked and fixed to each other. The first base 401 is provided with a waist-shaped hole and is fixed to the first base plate 1 via the waist-shaped hole and screws. The second base 403 is also provided with a waist-shaped hole and is fixed to the first base 401 via the waist-shaped hole and screws. The waist-shaped holes of the first and second bases 401, 403 are perpendicular to each other. The third base 405 is fixed to the second base 403 and also has two clamps 406 fixed to the third base 405 for clamping and securing the guide workpiece to be tested to the guide loading module 4. The first and second base fastening studs 402, 404 are used to cooperate with the waist-shaped holes to fine-tune the position of the first base 401 relative to the first base plate 1 and the position of the second base 403 relative to the first base 401.

[0029] like Figure 5As shown, the guide induction heating module 3 includes a second heating unit 301. The second heating unit 301 is annular and cylindrical, vertically fixed to the first base plate 1. The empty space inside the coil can accommodate a guide workpiece to be tested. The guide induction heating module 3 is used to heat the guide workpiece to be tested. The inner diameter of the high-frequency induction coil is larger than the outer diameter of the guide workpiece to be tested, facilitating installation of the guide workpiece. The coil is higher than the guide workpiece to be tested, enabling high-frequency heating of the entire guide workpiece. The operating frequency is 200 kHz to 230 kHz, and the high-frequency heating time is 4 seconds. The wires of the second heating unit 301 in the guide induction heating module 3 are led out of two conduits: a second input conduit 302 and a second output conduit 303, respectively, which are connected to the electrical control box below the first base plate 1.

[0030] like Figure 6 、 Figure 7 and Figure 8 As shown, the life test module 2 includes a second base plate 201, a fixed base 202, a rotating shaft 204, a motor 205, multiple detection heads 206, and multiple electric push rods 207. The second base plate 201 is fixed to the first base plate 1. The fixed base 202 is a circular ring structure fixed to the second base plate 201. The rotating shaft 204 is a cylindrical structure located in the middle of the fixed base 202. The motor 205 is fixedly mounted below the first base plate 1. The output shaft of the motor 205 passes upward through the first base plate 1 and the second base plate 201 and is fixed to the bottom of the rotating shaft 204. The outer diameter of the rotating shaft 204 is 0.05 mm smaller than the inner hole size of the guide workpiece to be tested, forming an interference fit. The top edge of the rotating shaft 204 is designed with a chamfer to facilitate the installation of the guide workpiece to be tested. During the life test, the motor 205 drives the rotating shaft 204 to rotate, which in turn drives the guide workpiece to be tested, which is mounted on the rotating shaft 204 via the interference fit, to rotate at high speed. Among them, the output speed of the motor 205 is set according to the speed of the guide workpiece to be measured under actual working conditions, and the rotating shaft 204 is made of 42CrMo material, whose thermal expansion coefficient is greater than the thermal expansion coefficient of the guide workpiece to be measured.

[0031] The fixed base 202 is circumferentially provided with multiple through-holes, and a plurality of electric push rods 207 are fixed in these circumferential through-holes. Each electric push rod 207, located within the fixed base 202, is secured to a test head 206 at one end. The test head 206 rotates vertically, and the electric push rod 207 is used to drive the test heads 206 toward or away from the center of the fixed base 202. In this embodiment, six electric push rods 207 and six test heads 206 are provided, each of which utilizes alloy rollers. The space between the six test heads 206 can accommodate a guide workpiece to be tested, and the height of the test heads 206 relative to the second base plate 201 is equal to half the height of the guide workpiece to be tested. The arc dimensions of the test heads 206 match those of the outer arc dimensions of the guide workpiece to be tested. During guide life testing, the concave outer surface of the guide workpiece to be tested substantially aligns with the arc surface of the test heads 206, effectively enabling the guide life test. The material of the detection head 206 is high-speed steel, which has a hardness slightly lower than that of the guide workpiece to be tested. The six detection heads 206 continuously apply pressure to the guide workpiece to be tested while the guide workpiece to be tested rotates rapidly, simulating the working condition of continuous rolling and conveying of steel bars.

[0032] A first heating unit 203 is embedded within the fixed base 202 of the life test module 2. To maintain the sensing distance within a circle around the surface of the workpiece being tested, the outer diameter of the workpiece is 40% to 43.5% of the inner diameter of the first heating unit 203 within the fixed base 202, thereby avoiding heating the entire inner bore of the workpiece. The operating frequency of the first heating unit 203 is the same as that of the second heating unit 301 in the guide induction heating module 3. The wires of the first heating unit 203 in the life test module 2 extend from two conduits: a first input conduit 208 and a first output conduit 209, which connect to the electrical control box beneath the first base plate 1.

[0033] The electric control box 6 is connected to the grabbing module 5, the life test module 2 and the guide induction heating module 3, and is used to control the operation of each module, thereby realizing centralized control of the equipment.

[0034] Based on the above-mentioned testing equipment, the present invention also discloses a method for testing the life of a cemented carbide guide for steel rolling, comprising steps S1-S5.

[0035] S1. The guide workpiece to be tested is pushed into the guide feeding module 4 by an external loading device; The grabbing module 5 moves two grippers 503, which grab the guide workpiece to be tested in the guide feeding module 4 and the guide induction heating module 3 and send them to the guide induction heating module 3 and the life testing module 2 respectively; if there is no guide workpiece to be tested in the guide induction heating module 3 at this time, the grippers 503 still perform the grabbing action according to the preset program; The guide induction heating module 3 performs induction heating on the guide workpiece to be tested in the guide induction heating module 3, and the heating time is about 4 seconds.

[0036] Then the life test module 2 performs a life test on the guide workpiece to be tested in the life test module 2 .

[0037] S2. The rotating shaft 204 drives the guide workpiece to rotate at high speed, while the first heating unit 203 continuously heats the guide workpiece. S3. The electric push rod 207 pushes the detection head 206 to apply pressure to the guide workpiece rotating at high speed in the life test module 2. The detection head 206 contacts the outer curved surface of the guide workpiece and rotates due to friction, thus simulating the actual steel bar rolling process.

[0038] S4. After the test is completed, the rotating shaft 204 stops rotating, the first heating unit 203 is powered off, and the electric push rod 207 drives the detection head 206 away from the guide workpiece to be tested, so that the guide workpiece to be tested can be taken out.

[0039] S5. Liquid nitrogen is introduced into the fixed base 202 to rapidly cool the guide workpiece to be tested and the rotating shaft 204. The guide workpiece in the life test module 2 is removed by external equipment or manually to observe the thermal cracks on the surface of the guide workpiece.

[0040] By repeating the above steps S1-S5, it is possible to continuously perform life tests on multiple guide workpieces.

[0041] The above equipment enables guide and guard manufacturers to conduct life tests immediately after guide and guard production. By observing the thermal cracks on the guide and guard surface after testing, it is determined that guides with more and deeper thermal cracks have a shorter service life, while guides with smaller and shallower thermal cracks have a longer service life. Based on the test results, the material ratio and production process of the guide and guard are adjusted. Repeated testing and adjustments are made to determine the most suitable carbide material for the guide and guard on site.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present invention should be included in the scope of protection of the present invention.

Claims

1. A life test equipment for cemented carbide guides for steel rolling, characterized in that: It includes a life test module, which includes a vertically arranged rotating shaft for positioning and fixing the guide workpiece to be tested, the rotating shaft is connected to a first driving member, and the rotating shaft rotates under the action of the first driving member, and a first heating unit for heating the guide workpiece to be tested is provided on the outer outer side of the rotating shaft, and a plurality of detection heads for contacting the outer arc surface of the guide workpiece to be tested are evenly provided on the circumferential outer side of the rotating shaft, and the detection head is connected to a second driving member, and the detection head approaches or moves away from the rotating shaft under the action of the second driving member.

2. The life test equipment for cemented carbide guides for steel rolling according to claim 1, characterized in that: It also includes a first base plate, the life test module is fixed on the first base plate, and a guide induction heating module for preheating the guide workpiece to be tested is fixed on the first base plate at a certain distance from the life test module. The guide induction heating module is a high-frequency induction coil.

3. The life test equipment for cemented carbide guides for steel rolling according to claim 2, characterized in that: It also includes a guide feeding module fixed on the first base plate and used to clamp the guide workpiece to be tested. The center positions of the life testing module, the guide induction heating module and the guide feeding module are located in the same straight line direction.

4. The life test equipment for cemented carbide guides for steel rolling according to claim 3, characterized in that: It also includes a grasping module, which includes an X-degree of freedom drive unit and two Z-degree of freedom drive units. Each Z-degree of freedom drive unit is equipped with a grasping clamp for clamping the guide. The driving direction of the X-degree of freedom drive unit is consistent with the arrangement direction of the life test module, the guide induction heating module and the guide feeding module. The driving direction of the Z-degree of freedom drive unit is vertical, and the two Z-degree of freedom drive units move synchronously.

5. The life test equipment for cemented carbide guides for steel rolling according to claim 1, characterized in that: The detection head is a roller with a vertical rotation axis. The contact surface between the detection head and the guide workpiece to be measured is an arc surface. The curvature of the arc surface matches the outer arc surface of the guide workpiece to be measured. The hardness of the detection head is lower than the hardness of the guide workpiece to be measured.

6. The life test equipment for cemented carbide guides for steel rolling according to claim 1, characterized in that: The outer wall of the rotating shaft and the inner wall of the guide workpiece to be measured have an interference fit; the first driver is a motor, and the second driver is an electric push rod.

7. The life test equipment for cemented carbide guides for steel rolling according to claim 1, characterized in that: The first heating unit is a high-frequency induction coil, and the inner diameter of the first heating unit is 2.29 to 2.50 times the outer diameter of the guide workpiece to be measured.

8. The life test equipment for cemented carbide guides for steel rolling according to claim 1, characterized in that: The life test module further includes a fixing base for fixing the second driver and a second bottom plate for fixing the fixing base.

9. A testing method using the testing device according to claims 1-8, characterized in that: The steps include: S1. The guide workpiece to be tested is set on the rotating shaft in the life test module; S2. The first driver drives the rotating shaft and the guide workpiece to be measured to rotate, and the second heating unit continues to heat the guide workpiece to be measured; S3. The second driver drives the detection head to be measured close to the guide workpiece and applies pressure, the detection head fits the outer curved surface of the guide workpiece to be measured and rotates under the action of friction; S4. After the test is completed, the first driver stops driving, the first heating unit stops heating, and the second driver drives the detection head to leave the guide workpiece to be measured; S5. Cool the guide workpiece to be tested and the rotating shaft in the life test module, and take out the guide workpiece to be tested.

10. The method for testing the life of cemented carbide guides for steel rolling according to claim 9, characterized in that: Before step S1, the guide guard workpiece to be tested is preheated by the guide guard induction heating module, and the preheated guide guard workpiece to be tested is transferred to the life test module by the gripping module.

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