A device for testing the thermal fatigue resistance of mold steel

Abstract

This invention relates to the field of testing device technology, specifically to a device for testing the thermal fatigue resistance of mold steel. The device includes an intelligent testing unit, a top mounting unit above the intelligent testing unit, an indirect control unit inside the top mounting unit, and two sets of ingot processing units outside the indirect control unit. By setting up two independent ingot processing units, each set includes an independent insertion cavity, with one cavity specifically for cooling and the other for heating. The mold steel ingot to be tested is smoothly transferred between the two cavities through the sliding of the cavity slider. This eliminates the need for a single insertion cavity to repeatedly endure extreme temperature alternations of "cooling-heating." Combined with intelligent quality inspection sensors, the device detects the ingot, avoiding thermal stress caused by repeated thermal expansion and contraction of the cavity material. This fundamentally eliminates the problem that frequent cold and hot cycles not only affect the surface of the mold steel ingot but also adversely affect the cavity material itself.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, specifically to a device for testing the thermal fatigue resistance of mold steel. Background Technology

[0002] In modern industrial manufacturing, die steel is a key basic material for core processes such as die casting, hot forging, and extrusion. Its performance directly determines the service life of the die, the processing accuracy of the product, and the production efficiency. Among these, thermal fatigue resistance is one of the core indicators for evaluating the quality of hot work die steel. In actual operation, hot work dies need to be in direct contact with hot metal for a long time and frequently experience intermittent cyclic conditions of "heat forming - medium cooling - reheating". This intense temperature change will generate alternating tensile and compressive thermal stresses inside the die steel. When the thermal stress is repeatedly applied and exceeds the yield limit of the material, micro-cracks will gradually emerge on the die surface. As the number of cycles increases, cracks continue to expand, eventually leading to mold chipping and failure. This not only increases downtime maintenance costs but may also cause product defects and production safety hazards. Traditional testing devices mostly use resistance furnaces, infrared lamps, or hot air systems for heating, combined with natural cooling, single water cooling, or air cooling to achieve temperature cycling. The thermal fatigue state of mold steel is judged through manual observation, offline testing, and intelligent sensors. However, these methods have many inherent defects and cannot meet the high-precision and intelligent testing requirements of modern industry. To facilitate the testing and processing of the heat resistance performance of mold steel, a fatigue testing device is needed.

[0003] Currently, traditional mold steel fatigue testing devices mostly adopt a single-cavity structure design. The cavity needs to integrate both cooling and heating modules to meet the temperature environment requirements during the testing process. During the testing operation, the mold steel ingot to be tested needs to be placed inside the single-cavity structure. However, during the testing process, the frequent switching between cold and hot cycles not only affects the surface of the mold steel ingot to be tested, but also has an adverse effect on the cavity material itself. This can easily lead to problems such as thermal stress damage, deformation, and aging of the cavity material, thereby affecting the long-term stable operation of the testing device. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the thermal fatigue resistance of mold steel, in order to solve the problem mentioned in the background art that, during the testing process, frequent switching between cold and hot cycles not only affects the surface of the mold steel ingot to be tested, but also has an adverse effect on the material of the cavity itself, which can easily lead to thermal stress damage, deformation, and aging of the material of the testing cavity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: It includes an intelligent detection unit, a top mounting unit above the intelligent detection unit, an indirect control unit inside the top mounting unit, a connecting block including a connecting block, a shrinkage groove inside the connecting block, a cavity slider slidably connected inside the shrinkage groove, slots on both the upper and lower sides of the connecting block, and connecting slots inside both slots of the connecting block; steel ingot processing units are respectively located at the outer ends of the indirect control unit, each steel ingot processing unit including an insertion cavity; a cold and hot component is fixedly connected inside the insertion cavity; one set of the cold and hot component in the steel ingot processing unit is a heating component, and the other set of the cold and hot component in the steel ingot processing unit is a cooling component; a torsion ring is provided outside the insertion cavity; locking blocks are fixedly connected to opposite sides of the inner wall of the torsion ring; a spacer cylinder is fixedly connected inside the insertion cavity; the cold and hot component is disposed between the outer side of the spacer cylinder and the inner side of the insertion cavity; and a sealing cover is threadedly connected to the top of the insertion cavity.

[0006] Preferably, the intelligent detection unit includes a mounting base, a displacement slide plate is slidably connected inside the mounting base, a rotary clamping assembly is fixedly connected to the top of the displacement slide plate, the rotary clamping assembly is electrically connected to an external control assembly, and two clamping frames are slidably connected to the top of the rotary clamping assembly.

[0007] Preferably, clamping plates are fixedly connected to the inner sides of both clamping frames, a quality inspection intelligent sensor is fixedly connected to the inner wall of the mounting base, the quality inspection intelligent sensor is electrically connected to an external control component, a disassembly U-frame is fixedly connected to the top of the mounting base, a telescopic cylinder is fixedly connected to the outer wall of the disassembly U-frame, the telescopic cylinder is electrically connected to an external control component, and a top component detection head is fixedly connected to the telescopic cylinder.

[0008] Preferably, the top mounting part includes a top mounting frame, which is fixedly connected to the top of the mounting base. A side mounting block is fixedly connected to the side of the top mounting frame. A shrinkage groove is opened inside the side mounting block. A displacement block is slidably connected inside the shrinkage groove. A spring is fixedly connected to the displacement block. A positioning rod is fixedly connected to the end of the displacement block.

[0009] Preferably, the connecting block is rotatably connected to the top mounting frame, and a rotating handle is fixedly connected to both sides of the outer wall of the connecting block. Two opposing clamping slots are opened on the outer wall of one of the rotating handles of the connecting block, and the clamping rod can be inserted into the interior of both clamping slots.

[0010] Preferably, a reversing handle is fixedly connected to another handle of the connecting block, the contraction groove is connected to two slots on the connecting block through a round hole, and the cavity slider can block the two slots on the connecting block.

[0011] Preferably, a position control cylinder is fixedly connected to the outer wall of the connecting block, the position control cylinder is electrically connected to an external control component, the position control cylinder is fixedly connected to the cavity slider, an external control block is fixedly connected to the outer wall of the connecting block, and the external control block is electrically connected to the two connecting slots.

[0012] Preferably, the insertion cavity is fixedly inserted into the corresponding slot of the connecting block, the cold and hot components can be electrically connected to the corresponding connecting slot, two opposing locking grooves are formed on the outer wall of the insertion cavity, and the torsion ring is rotatably connected to the corresponding side of the connecting block.

[0013] Preferably, both locking cavity blocks can be fixedly inserted into the corresponding locking cavity grooves, the end of the spacer cylinder is threaded, and a buffer spring is fixedly connected to the inner side of the sealing cover, the buffer spring being disposed in the corresponding spacer cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up two independent steel ingot processing units, each unit contains an independent insertion cavity, with a clear division of labor: one cavity is dedicated to refrigeration and the other to heating. The steel ingot to be tested is smoothly transferred between the two cavities through the sliding of the cavity-splitting slider. This eliminates the need for a single insertion cavity to repeatedly endure the extreme temperature alternation of "refrigeration-heating". The shrinkage groove inside the connecting block provides a stable sliding trajectory for the cavity-splitting slider. The position control cylinder is electrically connected to the external control components, which can precisely control the sliding stroke of the cavity-splitting slider to achieve precise connection and isolation between the two cavities. This ensures that the refrigeration cavity always maintains a low-temperature environment and the heating cavity always maintains a high-temperature environment, avoiding thermal stress caused by repeated thermal expansion and contraction of the cavity material. This fundamentally eliminates the problem that frequent switching between cold and hot cycles not only affects the surface of the steel ingot to be tested but also has an adverse effect on the cavity material itself, easily leading to thermal stress damage, deformation, and aging of the testing cavity material.

[0015] 2. After the steel ingot has undergone alternating cold and heat treatment in two cavities, the position control cylinder controls the movement of the cavity slider. In conjunction with the removal of the sealing cover, the steel ingot is precisely dropped between the two clamping frames of the rotating clamping assembly. The clamping plate can stably clamp the steel ingot, and the displacement slide plate can slide within the mounting base to adjust the detection position of the steel ingot. Combined with the detection functions of the quality inspection intelligent sensor and the top part detection head, the fatigue performance of the steel ingot can be accurately detected. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional assembly structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional assembly structure from below according to the present invention; Figure 3 This is an exploded structural diagram of the present invention; Figure 4 This is an exploded bottom view schematic diagram of the structure of the present invention; Figure 5 This is a partial cross-sectional view of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure of part A is shown. Figure 7 For the present invention Figure 5 A schematic diagram of the enlarged structure of section B is shown. Figure 8 This is a schematic diagram of the assembly structure of the intelligent detection unit of the present invention; Figure 9 This is a schematic diagram of the top mounting structure of the present invention; Figure 10 This is a schematic diagram of the assembly structure of the interlocking control unit of the present invention; Figure 11 This is a schematic diagram of the assembly structure of the steel ingot processing unit of the present invention.

[0017] In the attached diagram, the components represented by each number are as follows: 1. Intelligent Detection Unit; 101. Mounting Base; 102. Displacement Slide Plate; 103. Rotary Clamping Assembly; 104. Clamping Frame; 105. Clamping Plate; 106. Quality Inspection Intelligent Sensor; 107. Disassembly U-Frame; 108. Telescopic Cylinder; 109. Top Part Detection Head; 2. Top Mounting Unit; 201. Top Mounting Frame; 202. Side Mounting Block; 203. Shrinkage Slide; 204. Displacement Block; 205. Positioning Rod; 3. Indirect Control Unit; 301. Connecting block; 302. Positioning slot; 303. Reversing handle; 304. Shrinkage groove; 305. Cavity splitter; 306. Position control cylinder; 307. Connecting slot; 308. External control block; 4. Steel ingot processing section; 401. Insertion cavity; 402. Cold and hot components; 403. Locking cavity slide groove; 404. Torsion ring; 405. Locking cavity locking block; 406. Spacer cylinder; 407. Sealing cover; 408. Buffer spring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a technical solution: such as Figure 1 - Figure 11The fatigue detection device shown includes an intelligent detection unit 1, a top mounting unit 2 above the intelligent detection unit 1, and an indirect control unit 3 inside the top mounting unit 2. The indirect control unit 3 includes a connecting block 301, a shrinkage groove 304 inside the connecting block 301, a cavity slider 305 slidably connected inside the shrinkage groove 304, and connecting slots 307 inside the two slots of the connecting block 301. Steel ingot processing units 4 are respectively located at both ends of the outer side of the indirect control unit 3. Each steel ingot processing unit 4 includes an insertion cavity 401. The unit is fixedly connected to a cold and hot component 402. The cold and hot component 402 in one steel ingot processing unit is a heating component, and the cold and hot component 402 in another steel ingot processing unit is a cooling component. A torsion ring 404 is provided on the outside of the insertion cavity 401. Locking blocks 405 are fixedly connected to opposite sides of the inner wall of the torsion ring 404. A spacer cylinder 406 is fixedly connected to the inside of the insertion cavity 401. The cold and hot component 402 is located between the outside of the spacer cylinder 406 and the inside of the insertion cavity 401. A sealing cover 407 is threadedly connected to the top of the insertion cavity 401.

[0020] The intelligent detection unit 1 includes a mounting base 101, a displacement slide plate 102 is slidably connected inside the mounting base 101, a rotary clamping assembly 103 is fixedly connected to the top of the displacement slide plate 102, the rotary clamping assembly 103 is electrically connected to an external control assembly, and two clamping frames 104 are slidably connected to the top of the rotary clamping assembly 103.

[0021] Clamping plates 105 are fixedly attached to the inner sides of both clamping frames 104. A quality inspection intelligent sensor 106 is fixedly attached to the inner wall of the mounting base 101. The quality inspection intelligent sensor 106 is electrically connected to the external control component. The quality inspection intelligent sensor 106 is an intelligent laser displacement sensor that can non-contactly measure the thermal deformation, warping, and dimensional changes of steel ingots. This is known prior art and will not be described in detail. A disassembly U-frame 107 is fixedly attached to the top of the mounting base 101. A telescopic cylinder 108 is fixedly attached to the outer wall of the disassembly U-frame 107. The telescopic cylinder 108 is electrically connected to the external control component. A top component detection head 109 is fixedly attached to the telescopic cylinder 108.

[0022] The top mounting part 2 includes a top mounting frame 201, which is fixedly connected to the top of the mounting base 101. A side mounting block 202 is fixedly connected to the side of the top mounting frame 201. A shrinkage groove 203 is opened inside the side mounting block 202. A displacement block 204 is slidably connected inside the shrinkage groove 203. A spring is fixedly connected to the displacement block 204. A positioning rod 205 is fixedly connected to the end of the displacement block 204.

[0023] The connecting block 301 is rotatably connected to the top mounting bracket 201. A rotating handle is fixed to both sides of the outer wall of the connecting block 301. Two opposing clamping slots 302 are opened on the outer wall of one of the rotating handles of the connecting block 301. A clamping rod 205 can be inserted into the interior of both clamping slots 302.

[0024] A reversing handle 303 is fixedly connected to another handle of the connecting block 301. The shrinkage groove 304 is connected to the two slots on the connecting block 301 through a round hole. The cavity slider 305 can block the two slots on the connecting block 301.

[0025] A position control cylinder 306 is fixedly connected to the outer wall of the connecting block 301. The position control cylinder 306 is electrically connected to the external control component and is fixedly connected to the cavity slider 305. An external control block 308 is fixedly connected to the outer wall of the connecting block 301 and is electrically connected to two connecting slots 307.

[0026] The insertion cavity 401 is fixedly inserted into the corresponding slot of the connecting block 301. The cooling and heating components 402 can be electrically connected to the corresponding connecting slot 307. The cooling and heating components 402 are miniature cooling tubes or miniature heating tubes, which can be energized for cooling and heating. This is known prior art and will not be described in detail. Two opposing locking cavity grooves 403 are opened on the outer wall of the insertion cavity 401. The torsion ring 404 is rotatably connected to the corresponding side of the connecting block 301.

[0027] Both locking chamber blocks 405 can be fixedly inserted into the corresponding locking chamber grooves 403. The end of the spacer cylinder 406 is threaded. A buffer spring 408 is fixedly connected to the inner side of the sealing cover 407. The buffer spring 408 is set in the corresponding spacer cylinder 406.

[0028] Working principle: When in use, unscrew the sealing cover 407 on the top of the insertion cavity 401, put a single mold steel ingot to be cooled or heated into the spacer cylinder 406 of the insertion cavity 401, and then tighten the sealing cover 407 to ensure that the insertion cavity 401 is well sealed to prevent temperature loss during the cooling and heating process. Insert the insertion cavity 401 containing the single steel ingot into the slot on one side of the connecting block 301 to ensure that the insertion cavity 401 fits tightly with the slot.Rotate the torsion ring 404 to engage the two locking lugs 405 on the inner wall of the torsion ring 404 into the locking grooves 403 on the outer wall of the insertion cavity 401, thus locking and fixing the insertion cavity 401. Confirm that the cold and heat components 402 in the insertion cavity 401 are electrically connected to the connecting slots 307 in the slots of the connecting blocks 301. Confirm the circuit is working properly through the external control block 308. Start the cold and heat components 402 through the external control component to perform cold and heat treatment on the mold steel ingot in the insertion cavity 401 according to the preset parameters. After the first cold and heat treatment is completed, turn off the cold and heat components 402 and then start the position control cylinder 306 to drive the cavity slider 305 to slide. This connects the two insertion cavities 401, allowing the steel ingot to slide directly into the other insertion cavity 401. A corresponding buffer spring 408 buffers the steel ingot, and then the position control cylinder 306 controls the cavity slider 305 to reset, thus completing the switching of the steel ingot's insertion cavity 401. This process is repeated to perform cold-hot switching on the steel ingot for processing. The switching between the two cavities achieves cold-hot treatment of the steel ingot. Simultaneously, rotating the reversing handle 303 of the connecting block 301 reverses the direction of the connecting control unit 3, ensuring that the insertion cavity 401 containing the steel ingot remains in the upper position. During reversal, the steel ingot is assisted in... The two insertion cavities 401 are switched. After the position adjustment is completed, it is confirmed that the clamping rod 205 can automatically engage with the clamping slot 302 under the action of the spring, realizing the positioning of the connecting block 301. After the steel ingot has undergone the required number of alternating cold and heat treatments in the two cavities, the rotating clamping assembly 103 is moved to the bottom of the insertion cavity 401. At this time, the insertion cavity 401 with the steel ingot is at the top. When removing the steel ingot, the bottom sealing cover 407 is removed. Then, the position control cylinder 306 controls the movement of the cavity slider 305 to connect the two insertion cavities 401, allowing the steel ingot to slide directly from the top insertion cavity 401 between the two clamping frames 104. The rotating clamping assembly is started by the external control component. Part 103 controls two clamping frames 104 to move closer together, aligning the clamping plate 105 with the steel ingot and clamping it. Then, the intelligent quality inspection sensor 106 is activated, working in conjunction with the rotating clamping assembly 103 to rotate the steel ingot and perform fatigue testing. The test data is transmitted in real time to an external control component for recording and analysis. After the test is completed, the clamping frames 104 are released, and the steel ingot is removed, completing the entire operation. When additional testing is required, the disassembly U-frame 107 is directly fixed to the mounting base 101. Then, the telescopic cylinder 108 is activated via the external control component, causing it to move the top inspection head 109 towards the steel ingot. The top inspection head 109 then performs auxiliary testing by sliding and applying pressure to the surface of the steel ingot.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the thermal fatigue resistance of mold steel, comprising an intelligent detection unit, characterized in that: Above the intelligent detection unit is a top mounting unit, and inside the top mounting unit is an indirect control unit. The indirect control unit includes a connecting block, and the inside of the connecting block has a shrinkage groove. A cavity slider is slidably connected in the shrinkage groove. Slots are provided on both the upper and lower sides of the connecting block. Each of the two slots of the connecting block has a connecting slot. At the two outer ends of the indirect control unit are steel ingot processing units. Each steel ingot processing unit includes an insertion cavity. Cold and hot components are fixed inside the insertion cavity. The cold and hot components in one set of steel ingot processing units are heating components, and the cold and hot components in the other set of steel ingot processing units are cooling components. A torsion ring is provided outside the insertion cavity. Locking blocks are fixed on opposite sides of the inner wall of the torsion ring. A spacer cylinder is fixed inside the insertion cavity. The cold and hot components are located between the outside of the spacer cylinder and the inside of the insertion cavity. A sealing cover is connected to the top of the insertion cavity.

2. A device for testing the thermal fatigue resistance of mold steel according to claim 1, characterized in that: The intelligent detection unit includes a mounting base, with a displacement slide plate slidably connected inside the mounting base. A rotary clamping assembly is fixed to the top of the displacement slide plate, and two clamping frames are slidably connected to the top of the rotary clamping assembly.

3. A device for testing the thermal fatigue resistance of mold steel according to claim 2, characterized in that: Clamping plates are fixed to the inner sides of both clamping frames. A quality inspection intelligent sensor is fixed to the inner wall of the mounting base. A disassembly U-frame is fixed to the top of the mounting base. A telescopic cylinder is fixed to the outer wall of the disassembly U-frame. A top component detection head is fixed to the telescopic cylinder.

4. A device for testing the thermal fatigue resistance of mold steel according to claim 2, characterized in that: The top mounting part includes a top mounting frame, which is fixed to the top of the mounting base. A side mounting block is fixed to the side of the top mounting frame. A shrinkage groove is opened inside the side mounting block. A displacement block is slidably connected inside the shrinkage groove. A spring is fixed to the displacement block. A positioning rod is fixed to the end of the displacement block.

5. A device for testing the thermal fatigue resistance of mold steel according to claim 4, characterized in that: The connecting block is rotatably connected to the top mounting frame. Rotary handles are fixed to both sides of the outer wall of the connecting block. Two opposing clamping slots are opened on the outer wall of one of the rotating handles of the connecting block. A clamping rod can be inserted into the interior of each clamping slot.

6. A device for testing the thermal fatigue resistance of mold steel according to claim 5, characterized in that: A reversing handle is fixed to another handle of the connecting block. The shrinkage groove is connected to two slots on the connecting block through round holes. The cavity slider can block the two slots on the connecting block.

7. A device for testing the thermal fatigue resistance of mold steel according to claim 6, characterized in that: A position control cylinder is fixedly connected to the outer wall of the connecting block, and the position control cylinder is fixedly connected to the cavity slider.

8. A device for testing the thermal fatigue resistance of mold steel according to claim 1, characterized in that: The insertion cavity is fixedly inserted into the corresponding slot of the connecting block. The cold and hot components can be electrically connected to the corresponding connecting slot. Two opposing locking cavity grooves are opened on the outer wall of the insertion cavity, and the torsion ring is rotatably connected to the corresponding side of the connecting block.

9. A device for testing the thermal fatigue resistance of mold steel according to claim 8, characterized in that: Both locking chamber blocks can be fixedly inserted into the corresponding locking chamber grooves, and a buffer spring is fixedly connected to the inner side of the sealing cover. The buffer spring is set in the corresponding spacer cylinder.

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