Thermal fatigue life detection equipment for die-casting die

Abstract

The invention discloses a die-casting die thermal fatigue life detection device, and relates to the technical field of die-casting die detection, the die-casting die thermal fatigue life detection device comprises a detection machine body and a control platform, and the top of the detection machine body is provided with a material thermal fatigue detection assembly and a mechanical load mechanism. When the device is used, the electric push rod pushes the heat insulation sleeve to penetrate through the penetrating hole and continue to move, and the movable turning cover is jacked upwards. Under the combination of the vacuum cavity, the honeycomb-shaped porous heat insulation plate and the metal foil reflecting screen, the heat insulation sleeve forms a triple barrier of reflection, vacuum and porous heat insulation, heat transfer is blocked, and it is guaranteed that cold air is not affected by heat of an air cooling opening when blown. When the material thermal fatigue detection assembly works, the cold air pipe and the heat insulation sleeve are located outside the detection box, the heat absorption temperature of the cold air pipe is prevented from increasing in the heating process, and the mold thermal fatigue detection precision and efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of die casting mold detection, in particular to a die casting mold thermal fatigue life detection equipment. BACKGROUND

[0002] The die casting mold is a tool for metal pressure casting, mainly used for high-speed pressing of molten metal into the mold cavity under high pressure to form a specific shaped part. The performance of the die casting mold directly affects the quality of the casting, production efficiency and mold life, and thermal fatigue is one of the most common failure modes of the die casting mold. Thermal fatigue life detection is to simulate the thermal cycle conditions in the actual work of the die casting mold, test the crack initiation and propagation resistance of the mold material or surface under periodic thermal stress, and evaluate its service life.

[0003] In the prior art, when detecting the thermal fatigue of the die casting mold, a sheet-shaped sample is first taken out from the mold, then the sheet-shaped sample is placed in the detection equipment, the actual working conditions are simulated by heating and cooling cycles, and the surface crack of the sample is detected to judge the thermal fatigue life of the die casting mold. Among them, the air cooling method is used for cooling, and the air cooling port is usually located in the interior of the equipment. However, during the heating process, the air cooling port will also be heated, resulting in a high temperature at the air cooling port. When the cold air is blown out from the air cooling port with a high temperature, the temperature changes, resulting in a high temperature of the cold air actually blown to the mold sample, affecting the cooling speed, prolonging the cooling time, and thus reducing the overall detection efficiency.

[0004] Therefore, we propose a die casting mold thermal fatigue life detection equipment to solve the problems raised in the background art. SUMMARY

[0005] The purpose of the present application is to provide a die casting mold thermal fatigue life detection equipment to solve the problem of the die casting mold sample thermal fatigue detection process in the background art, in which the air cooling port is affected by heating, resulting in a high temperature, resulting in a high temperature of the cold air actually blown to the mold sample, affecting the cooling speed, prolonging the cooling time, and thus reducing the overall detection efficiency.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a die casting mold thermal fatigue life detection equipment, comprising a detection machine body and a control platform, a material thermal fatigue detection assembly and a mechanical load mechanism are arranged on the top of the detection machine body, and a heat absorption prevention assembly is arranged on the outer surface of both sides of the material thermal fatigue detection assembly.

[0007] The material thermal fatigue detection assembly comprises a detection box, a plurality of penetrating holes are formed in the outer surface of both sides of the detection box, two annular cooling grooves are formed in the interior of the detection box, and the annular cooling grooves are responsible for cooling the penetrating holes to preliminarily reduce the heat transferred to the heat absorption prevention assembly;

[0008] Two said heat absorption prevention components each include an annular air pipe, the outer surface of each of the two annular air pipes is fixedly connected with a plurality of cold air pipes, the outer surface of each of the plurality of cold air pipes is movably sleeved with a heat insulation sleeve, the inside of each of the plurality of heat insulation sleeves is provided with a vacuum cavity and a heat insulation cavity, the inside of each of the plurality of heat insulation cavities is provided with a honeycomb porous heat insulation plate, the outer surface of each of the plurality of honeycomb porous heat insulation plates is provided with a metal foil reflection screen, the heat insulation sleeve is responsible for insulating heat transfer to the cold air pipe, thereby preventing the cooling gas inside the cold air pipe from being heated by heat absorption.

[0009] Preferably, the inner wall of each of the plurality of heat insulation cavities is coated with a high-reflectivity coating, the cold air pipe and the heat insulation sleeve are located on the outer surface of the detection box, preventing the cold air pipe from being heated when the inside of the detection box is heated, the inside of each of the two annular air pipes is fixedly connected with an air inlet pipe, the outer surface of each of the two annular air pipes is fixedly installed with a fixed plate and an annular plate, the outer surface of one side of each of the two annular plates is fixedly installed with four connecting rods, four connecting rods per circle of the eight connecting rods form a group, one end of each of the two groups of connecting rods is fixedly installed with a push plate, the outer surface of one side of each of the two push plates is fixedly installed with an electric push rod.

[0010] Preferably, the inside of each of the two push plates is movably embedded with two support rods, the outer surface between each of the two adjacent support rods is fixedly installed with a mounting plate, one end of each of the two electric push rods is fixedly installed on the outer surface of one side of the two mounting plates, seven cold air pipes per circle of the plurality of cold air pipes form a group, one end of each of the two groups of cold air pipes is fixedly penetrated to the outer surface of the two fixed plates.

[0011] Preferably, seven heat insulation sleeves per circle of the plurality of heat insulation sleeves form a group, one end of each of the two groups of heat insulation sleeves is installed on the outer surface of one side of the two fixed plates through a screw, one end of each of the two support rods is movably penetrated to the outer surface of the two annular plates, one end of each of the two support rods is fixedly installed on the outer surface of one side of the detection box, the other end of each of the two support rods is fixedly installed on the outer surface of both sides of the detection machine body.

[0012] Preferably, the inside of the detection box is fixedly installed with a box plate, the inside of the box plate is provided with a detection window, both sides of the inside of the detection box are provided with a heating system, the top of the back surface of the box plate is provided with a temperature control system, the bottom of the back surface of the box plate is provided with an exhaust system.

[0013] Preferably, the back surface of the detection box is installed with a detection plate through a bolt, the front surface of the detection plate is fixedly installed with a visual sensor, the bottom surface of the inside of the detection box is provided with a rotating system, the top of the rotating system is provided with a lower clamp, the bottom end of the mechanical load mechanism is movably connected with an upper clamp, the bottom end of the mechanical load mechanism is movably penetrated to the inside of the detection box.

[0014] Preferably, the top surface of the two annular cooling grooves is fixedly connected with a cooling water inlet pipe, the outer surface of the two cooling water inlet pipes is provided with a first electromagnetic valve, the bottom surface of the two annular cooling grooves is fixedly connected with a cold water drainage pipe, the outer surface of the two cold water drainage pipes is provided with a second electromagnetic valve, and the two sides of the detection box are provided with a plurality of movable grooves.

[0015] Preferably, the outer surface of the plurality of fixed rods is movably sleeved with a movable cover, the bottom of the outer surface of one side of the plurality of movable covers is fixedly installed with a gravity block, the outer surface of the other side of the plurality of movable covers is fixedly connected with a heat insulation pad, and seven heat insulation pads per circle of the plurality of heat insulation pads form a group.

[0016] Preferably, the outer surface of the two groups of heat insulation pads is respectively in contact with the two sides of the detection box, the movable cover covers the penetrating hole, and the penetrating hole is sealed by the heat insulation pad, so that heat is prevented from flowing outwards from the penetrating hole when the detection box is heated.

[0017] Preferably, the front surface of the detection box is provided with a sealing door, the bottom of the detection box and the bottom of the rotating system are fixedly installed on the top of the detection machine body, seven penetrating holes per circle of the plurality of penetrating holes form a group, the two annular cooling grooves are located at the two groups of penetrating holes, and one end of the two cooling water inlet pipes and one end of the two cold water drainage pipes are fixedly penetrated to the outer surface of the detection box.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1、When the present application is used, the electric push rod pushes the heat insulation sleeve through the penetrating hole and continues to move, and the movable cover is lifted upwards. Under the combination of the vacuum cavity, the honeycomb-shaped porous heat insulation plate and the metal foil reflecting screen, the heat insulation sleeve forms a "reflection + vacuum + porous heat insulation" triple barrier to block heat transfer, so that the cold air is not affected by the heat of the air cooling port when blowing cold air. When the material thermal fatigue detection assembly is working, the cold air pipe and the heat insulation sleeve are located outside the detection box to avoid the temperature of the cold air pipe from being too high due to heat absorption during the heating process. Under the action of the heat insulation sleeve, the heat insulation protection distance is increased, the cold air heat insulation path is prolonged, and the contact time of the cold air with the surrounding hot air is reduced, so that the cold air can better maintain a low temperature state and blow to the sample, improving the cooling effect of the sample and being beneficial to improving the precision and efficiency of the mold thermal fatigue detection.

[0020] 2、The application is used, the heating system is started and the heating process when the simulation mold contacts high temperature metal, the rotating system drives the sample to rotate and heat, the temperature control system accurately controls the heating time and rate. The heat absorption prevention assembly simulates the rapid cooling process after the mold is demolded, realizes the cold and hot cycle. The visual sensor periodically shoots the sample surface, the computer host in the control platform runs the detection software, measures the crack length, when the crack length reaches the critical value or the sample is broken, the equipment automatically stops the cycle, takes the crack initiation or expansion to a certain length as the end of life, reflects the ability of the material to resist thermal fatigue damage, as the thermal fatigue life. The rotating system is paused, the mechanical load mechanism is started, the static stress is applied to the sample through the upper clamp and the lower clamp, the mechanical stress can be measured, and "thermal-mechanical fatigue" composite detection is realized.

[0021] 3、The application is used, the first electromagnetic valve is started, the cooling water flows into the annular cooling groove through the cooling water inlet pipe, then the second electromagnetic valve is started, the cold water is discharged through the cold water drain pipe, the cooling water is continuously flowed to cool the through hole and reduce the temperature of the two sides of the detection box, thereby preliminarily cooling the path where the cold air pipe is inserted into the detection box, reducing the heat transfer from the through hole to the cold air pipe, playing an auxiliary heat insulation effect, and being beneficial to the stable output of cooling air of the subsequent cold air pipe and efficiently cooling the sample. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a first angle perspective view of the die casting mold thermal fatigue life detection equipment of the application;

[0023] Figure 2 It is a second angle perspective view of the die casting mold thermal fatigue life detection equipment of the application;

[0024] Figure 3 It is a structure development perspective view of the material thermal fatigue detection assembly in the die casting mold thermal fatigue life detection equipment of the application;

[0025] Figure 4 It is a partial structure sectional view of the detection box in the die casting mold thermal fatigue life detection equipment of the application;

[0026] Figure 5 It is a structure development perspective view of the box plate in the die casting mold thermal fatigue life detection equipment of the application;

[0027] Figure 6 It is a structure development perspective view of the heat absorption prevention assembly in the die casting mold thermal fatigue life detection equipment of the application;

[0028] Figure 7 It is a structure sectional view of the heat insulation sleeve in the die casting mold thermal fatigue life detection equipment of the application;

[0029] Figure 8 It is a structure section view schematic diagram of the annular cooling groove in the die casting die thermal fatigue life detection equipment of the present application;

[0030] Figure 9 It is a structure section view schematic diagram of the honeycomb porous heat insulation plate in the die casting die thermal fatigue life detection equipment of the present application;

[0031] Figure 10 It is a structure section view schematic diagram of the metal foil reflecting screen in the die casting die thermal fatigue life detection equipment of the present application.

[0032] In the figure:

[0033] 1, detection machine body; 2, control platform; 3, material thermal fatigue detection assembly; 301, detection box; 302, box plate; 303, detection plate; 304, visual sensor; 305, temperature control system; 306, exhaust system; 307, upper clamp; 308, rotating system; 309, lower clamp; 310, heating system; 311, through hole; 312, annular cooling groove; 313, cooling water inlet pipe; 314, first electromagnetic valve; 315, cold water drain pipe; 316, second electromagnetic valve; 317, movable groove; 318, fixed rod; 319, movable flap; 320, gravity block; 321, heat insulation pad; 322, detection window; 4, heat absorption prevention assembly; 401, annular air pipe; 402, air inlet pipe; 403, cold air pipe; 404, heat insulation sleeve; 405, vacuum cavity; 406, heat insulation cavity; 407, honeycomb porous heat insulation plate; 408, metal foil reflecting screen; 409, fixed plate; 410, annular plate; 411, connecting rod; 412, push plate; 413, electric push rod; 414, support rod; 415, mounting plate; 5, mechanical load mechanism. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0035] Embodiment one: please refer to Figures 1-10As shown, the present application provides a technical scheme: a die casting mold thermal fatigue life detection equipment, including detection machine body 1 and control platform 2, the top of detection machine body 1 is provided with material thermal fatigue detection assembly 3 and mechanical load mechanism 5, the outer surface of both sides of material thermal fatigue detection assembly 3 is provided with anti-heat absorption assembly 4;Material thermal fatigue detection assembly 3 includes detection box 301, the outer surface of both sides of detection box 301 is provided with a plurality of through holes 311, the inside of detection box 301 is provided with two annular cooling grooves 312, the annular cooling grooves 312 are responsible for cooling the through holes 311, and the heat transferred to the anti-heat absorption assembly 4 is preliminarily reduced;Two anti-heat absorption assemblies 4 each include an annular air pipe 401, the outer surface of the two annular air pipes 401 is fixedly connected with a plurality of cold air pipes 403, the outer surface of the plurality of cold air pipes 403 is movably sleeved with a heat insulation sleeve 404, the inside of the plurality of heat insulation sleeves 404 is provided with a vacuum cavity 405 and a heat insulation cavity 406, the inside of the plurality of heat insulation cavities 406 is provided with a honeycomb porous heat insulation plate 407, the outer surface of the plurality of honeycomb porous heat insulation plates 407 is provided with a metal foil reflection screen 408, the heat insulation sleeve 404 is responsible for isolating heat transmission to the cold air pipe 403, so as to prevent the cooling gas in the cold air pipe 403 from being heated by heat absorption, the inner wall of the plurality of heat insulation cavities 406 is coated with a high reflection coating, the cold air pipe 403 and the heat insulation sleeve 404 are located on the outer surface of the detection box 301, so as to prevent the cold air pipe 403 from being heated when the inside of the detection box 301 is heated, the inside of the two annular air pipes 401 is fixedly connected with an air inlet pipe 402, the outer surface of the two annular air pipes 401 is fixedly connected with a fixed plate 409 and an annular plate 410, the outer surface of one side of the two annular plates 410 is fixedly connected with four connecting rods 411, the four connecting rods 411 periphery of the eight connecting rods 411 are a group, one end of the two groups of connecting rods 411 is fixedly connected with a push plate 412, the outer surface of one side of the two push plates 412 is fixedly connected with an electric push rod 413, the inside of the two push plates 412 is movably embedded with two support rods 414, the outer surface between every adjacent two support rods 414 is fixedly connected with a mounting plate 415, one end of the two electric push rods 413 is fixedly connected to the outer surface of one side of the two mounting plates 415, seven cold air pipes 403 periphery of the plurality of cold air pipes 403 are a group, one end of the two groups of cold air pipes 403 is fixedly penetrated to the outer surface of the two fixed plates 409, seven heat insulation sleeves 404 periphery of the plurality of heat insulation sleeves 404 are a group, one end of the two groups of heat insulation sleeves 404 is fixedly connected to the outer surface of one side of the two fixed plates 409, one end of every two support rods 414 is movably penetrated to the outer surface of the two annular plates 410, one end of every two support rods 414 is fixedly connected to the outer surface of one side of the detection box 301, the other end of every two support rods 414 is fixedly connected to the outer surface of both sides of the detection machine body 1.

[0036] In this embodiment, the visual sensor 304, the temperature control system 305, the exhaust system 306, the rotating system 308, the heating system 310, the first electromagnetic valve 314, the second electromagnetic valve 316, the electric push rod 413, the mechanical load mechanism 5 and the control platform 2 are electrically connected during use. One end of each of the two air inlet pipes 402 is connected to an external air cooling device through a flange. The movable flaps 319 on both sides of the detection box 301 are circumferentially distributed outside the two heating systems 310, respectively, as shown in Figure 7When the mold sample needs to be cooled after the heating simulation of the heating system 310 in the material thermal fatigue detection assembly 3, the heating system 310 is turned off, and the first cooling of the penetrating hole 311 is performed through the annular cooling groove 312, so that the temperature of the penetrating hole 311 and the inner side wall of the detection box 301 is reduced. Then, the two electric push rods 413 are started to push the sliding plate 412 and the annular plate 410 to slide on the outer surface of the support rod 414, and to push the annular air pipe 401, the air inlet pipe 402 and the fixed plate 409 to move, so that one end of the plurality of heat insulation sleeves 404 distributed in a circle is first moved into the corresponding penetrating hole 311, and during the movement, the movable flap 319 is lifted up, so that the bottom of the movable flap 319 falls onto the outer surface of the heat insulation sleeve 404. When the electric push rod 413 is automatically turned off, one end of the heat insulation sleeve 404 moves into the detection box 301 and approaches the sample, and at the same time, the cold air pipe 403 penetrates into the penetrating hole 311. Then, the external air cooling equipment is started to deliver cold air into the annular air pipe 401 through the air inlet pipe 402, and the cold air is blown out through the plurality of cold air pipes 403. At this time, the cold air will continue to move outward along the inner wall of the heat insulation sleeve 404, and the cold air will be blown to the surface of the sample through the air outlet of the heat insulation sleeve 404, simulating the mold cooling process. The vacuum cavity 405 is arranged at the inner and outer layers of the heat insulation sleeve 404, which eliminates the air convection between the outside of the heat insulation sleeve 404 and the inside of the heat insulation sleeve 404, greatly reducing the heat conduction; the high-reflective coating coated on the inner wall of the heat insulation cavity 406 can reflect heat radiation, reducing the heat transfer to the cold air pipe 403 inside the heat insulation sleeve 404 through radiation; the metal foil reflecting screen 408 can further reflect residual heat radiation, and the bending structure can increase the reflection times of heat radiation, so that the energy of the radiation heat is attenuated after multiple reflections between layers, reducing the penetration efficiency of the radiation heat; the honeycomb porous heat insulation plate 407 suppresses heat conduction and small air convection through the porous structure, and blocks heat by using the low thermal conductivity of the material itself. Under the combination of the vacuum cavity 405, the honeycomb porous heat insulation plate 407 and the metal foil reflecting screen 408, the heat insulation sleeve 404 forms a "reflection + vacuum + porous heat insulation" triple barrier to block heat transfer from three dimensions of heat radiation, heat conduction and heat convection, ensuring that the cooling air in the cold air pipe 403 is stable in temperature, so that the cold air blowing will not be affected by the heat of the air cooling port, causing the temperature to rise and affecting the cooling speed and effect, which is beneficial to improve the precision and efficiency of the mold thermal fatigue detection. When the material thermal fatigue detection assembly 3 is working, the cold air pipe 403 and the heat insulation sleeve 404 are located outside the detection box 301 under the pull of the electric push rod 413, avoiding the temperature of the cold air pipe 403 from rising due to heat absorption during the heating process. Under the action of the heat insulation sleeve 404, the heat insulation protection distance is increased, the cold air heat insulation path is prolonged, and the contact time of the cold air with the surrounding hot air is reduced, so that the cold air can better maintain a low temperature state and blow to the sample, improving the cooling effect on the sample and being beneficial to improve the overall detection efficiency.Thanks to the heat absorption protection component 4, the problem that the air cooling port is affected by heating during the thermal fatigue testing of die-casting mold samples, resulting in a higher temperature and thus a higher actual temperature of the cold air blown onto the mold sample, affecting the cooling rate, prolonging the cooling time, and reducing the overall testing efficiency is solved.

[0037] Example 2: Figures 2-8 As shown, the material thermal fatigue testing assembly 3 includes a testing box 301. Multiple through holes 311 are provided on both outer surfaces of the testing box 301. Two annular cooling grooves 312 are provided inside the testing box 301. The annular cooling grooves 312 are responsible for cooling the through holes 311, initially reducing the heat transferred to the heat-absorbing component 4. A testing plate 303 is bolted to the rear surface of the testing box 301. A vision sensor 304 is fixedly mounted on the front surface of the testing plate 303. A rotation system 308 is provided on the bottom surface inside the testing box 301. The top of the rotation system 308... The lower clamp 309 is provided, and the bottom end of the mechanical load mechanism 5 is movably connected to the upper clamp 307. The bottom end of the mechanical load mechanism 5 extends movably into the interior of the testing box 301. A box plate 302 is fixedly installed inside the testing box 301. A testing window 322 is provided inside the box plate 302. Heating systems 310 are provided on both sides inside the testing box 301. A temperature control system 305 is provided at the top of the rear surface of the box plate 302. An exhaust system 306 is provided at the bottom of the rear surface of the box plate 302. Multiple movable slots 317 are provided on both sides inside the testing box 301. Each of the 317 has a fixed rod 318 inside. Each of the fixed rods 318 has a movable flip cover 319 movably fitted onto its outer surface. Each of the movable flip covers 319 has a gravity block 320 fixedly installed at the bottom of one side of its outer surface. Each of the movable flip covers 319 has a heat insulation pad 321 fixedly connected to its other side of its outer surface. Seven heat insulation pads 321 are distributed circumferentially as a group. The outer surfaces of two groups of heat insulation pads 321 respectively contact the two sides inside the detection box 301. The movable flip cover 319 covers the insertion hole 311 and is connected to the heat insulation pad 319. 21. The insertion holes 311 are sealed to prevent heat from escaping from the insertion holes 311 when the inside of the test chamber 301 is heated. A sealing door is provided on the front surface of the test chamber 301. The bottom of the test chamber 301 and the bottom of the rotating system 308 are fixedly installed on the top of the test body 1. The multiple insertion holes 311 are distributed in groups of seven per circumference. Two annular cooling grooves 312 are located at the two groups of insertion holes 311 respectively. One end of the two cooling water inlet pipes 313 and one end of the two cold water drain pipes 315 are fixedly extended to the outer surface of the test chamber 301.

[0038] In this embodiment, when in use, the sheet-shaped sample taken off from the die casting mold is clamped and fixed in the upper clamp 307 and the lower clamp 309. The top end of the upper clamp 307 is movably embedded in the inside of the bottom end of the mechanical load mechanism 5, and can rotate together with the lower clamp 309 and the clamped and fixed sheet-shaped sample. After the sample is fixed, the sealing door is closed, and an observation window is opened on the sealing door. Then, the two heating systems 310 and the rotating system 308 are started by the control platform 2. The heating system 310 generates heat to heat the sample, simulating the heating process when the mold contacts the high-temperature metal, and under the action of the rotating system 308, the sample is rotated and heated. At the same time, the temperature inside the detection box 301 is detected by the temperature control system 305, and the power of the heating system 310 is adjusted according to the temperature change to accurately control the heating time. After heating is completed, the rotating sample is air-cooled by the anti-heat-sucking assembly 4 to reduce the sample temperature, simulate the rapid cooling process after the mold is demolded, and realize the cold and hot cycle. The gas in the detection box 301 can be discharged through the exhaust system 306. The visual sensor 304 is started in advance, and the sample surface is periodically photographed through the detection window 322 to observe the surface crack initiation and propagation, and the photographed image information is transmitted to the control platform 2 in the form of electrical signal for identification and analysis. The detection software runs on the computer host to store and analyze data. Repeat the above heating and cooling process to form a periodic thermal stress. After each cycle, the visual sensor 304 automatically photographs the sample surface, and the detection software in the control platform 2 measures the crack length by image recognition technology, draws a “cycle number-crack length” curve, analyzes the difference in thermal fatigue resistance of different materials or processes, and when the crack length reaches a critical value or the sample is broken, the equipment automatically stops cycling. Taking the crack initiation or propagation to a certain length as the end of life reflects the ability of the material to resist thermal fatigue damage as the thermal fatigue life. The rotating system 308 is paused, and the mechanical load mechanism 5 is started to apply static stress such as tension to the sample through the upper clamp 307 and the lower clamp 309 to measure the mechanical stress and realize “thermal-mechanical fatigue” composite detection. The movable flaps 319 are covered at the insertion holes 311, and the insertion holes 311 are sealed by the heat insulation pads 321 to prevent heat loss from the insertion holes 311 when the inside of the detection box 301 is heated, which does not affect the heating efficiency of the material. As shown in Figure 7 , the gravity blocks 320 are located at the bottom of the movable flaps 319, so that the center of gravity of the movable flaps 319 moves to the bottom. When the anti-heat-sucking assembly 4 works, the movable flaps 319 are lifted up from the insertion holes 311, and when the anti-heat-sucking assembly 4 resets, the lifted movable flaps 319 automatically flip down under the action of the bottom center of gravity, cover the insertion holes 311 again, and make the heat insulation pads 321 seal the insertion holes 311 again.

[0039] Embodiment Three: Figures 5-9As shown, the material thermal fatigue detection assembly 3 includes a detection box 301. Multiple through-holes 311 are formed on the outer surfaces of both sides of the detection box 301. Two annular cooling grooves 312 are formed in the interior of the detection box 301. The annular cooling grooves 312 are responsible for cooling the through-holes 311 and preliminarily reducing the heat transferred to the heat absorption prevention assembly 4. Cooling water inlets 313 are fixedly connected to the top surfaces inside the two annular cooling grooves 312. First electromagnetic valves 314 are arranged on the outer surfaces of the two cooling water inlets 313. Cold water outlets 315 are fixedly connected to the bottom surfaces inside the two annular cooling grooves 312. Second electromagnetic valves 316 are arranged on the outer surfaces of the two cold water outlets 315. Multiple movable grooves 317 are formed on both sides of the interior of the detection box 301. Multiple fixed rods 318 are fixedly installed inside the multiple movable grooves 317. Multiple movable flaps 319 are movably sleeved on the outer surfaces of the multiple fixed rods 318. Gravity blocks 320 are fixedly installed on the bottom of one side of the outer surfaces of the multiple movable flaps 319. Heat insulation pads 321 are fixedly connected to the other side of the outer surfaces of the multiple movable flaps 319. Seven heat insulation pads 321 circumferentially distributed in each group. The outer surfaces of the two groups of heat insulation pads 321 are respectively in contact with the two sides of the interior of the detection box 301. The movable flaps 319 cover the through-holes 311 and seal the through-holes 311 by the heat insulation pads 321, so as to prevent the heat from flowing outwards from the through-holes 311 when the interior of the detection box 301 is heated.

[0040] In use, one end of the cooling water inlet 313 is connected with an external cold water device, and the cold water outlet 315 is connected with an external circulation device. When the sample completes the heating simulation and needs to be cooled, the first electromagnetic valve 314 and the external cold water device are started. The cooling water is transported into the cooling water inlet 313 through the cold water device, and then the cooling water flows into the annular cooling groove 312. When the annular cooling groove 312 is filled with cooling water, the second electromagnetic valve 316 is automatically started, and the cooling water is discharged through the cold water outlet 315. By continuously flowing the cooling water in the annular cooling groove 312, the through-holes 311 can be cooled, and the temperature of the two sides of the interior of the detection box 301 can be reduced, so as to preliminarily cool the path where the cold air pipe 403 is inserted into the detection box 301, reduce the heat transfer from the through-holes 311 to the cold air pipe 403, and play an auxiliary heat insulation effect, which is conducive to the stable output of the cooling air of the cold air pipe 403 and the efficient cooling of the sample.

[0041] The effect and working principle of the whole mechanism are as follows: the mold sample is clamped and fixed in the upper clamp 307 and the lower clamp 309. The control platform 2 starts the two heating systems 310 and the rotating system 308. The heating system 310 generates heat to simulate the heating process of the mold when it contacts high-temperature metal. Under the action of the rotating system 308, the sample is rotated and heated. At the same time, the temperature control system 305 accurately controls the heating time and rate. Through the anti-heat absorption component 4, the rapid cooling process after the mold demolding is simulated to realize the cold and hot cycle. The visual sensor 304 periodically shoots the sample surface to observe the surface crack initiation and propagation, and transmits the photographed image information to the control platform 2 for identification and analysis. The computer host runs the detection software to measure the crack length through image recognition technology, reflecting the material's resistance to thermal fatigue damage. The first electromagnetic valve 314 and the external cold water equipment are started, and the cooling water is delivered into the cooling water inlet pipe 313 through the cooling water equipment, and then the cooling water flows into the annular cooling tank 312. When the annular cooling tank 312 is filled with cooling water, the second electromagnetic valve 316 is automatically started, and the cooling water is discharged through the cooling water drain pipe 315 to cool the through-hole 311 and reduce the temperature on both sides of the detection box 301. Start two electric push rods 413 to push the moving plate 412 and the annular plate 410 to move, and push the annular air pipe 401, the air inlet pipe 402 and the fixed plate 409 to move, so that one end of the heat insulation sleeve 404 passes through the through-hole 311, and continues to move to lift the movable flap 319 upward. When the electric push rod 413 is automatically closed, one end of the heat insulation sleeve 404 moves into the detection box 301 and approaches the sample. Then start the external air cooling equipment, deliver the cold air into the annular air pipe 401 through the air inlet pipe 402, and blow out the cold air through the multiple cold air pipes 403. At this time, the cold air will continue to move outward along the inner wall of the heat insulation sleeve 404, and blow the cold air to the sample surface through the air outlet of the heat insulation sleeve 404, simulating the mold cooling process. Under the combination of the vacuum cavity 405, the honeycomb porous heat insulation plate 407 and the metal foil reflecting screen 408, the heat insulation sleeve 404 forms a "reflection + vacuum + porous heat insulation" triple barrier, which blocks heat transfer from three dimensions of heat radiation, heat conduction and heat convection, ensuring that the cooling air in the cold air pipe 403 is stable in temperature, so that the cold air is not affected by the heat of the air cooling port when blowing. And when the material thermal fatigue detection assembly 3 works, the cold air pipe 403 and the heat insulation sleeve 404 are located outside the detection box 301 under the pull of the electric push rod 413, avoiding the temperature of the cold air pipe 403 from being too high due to heat absorption during the heating process.

[0042] Among them, the control platform 2, the visual sensor 304, the temperature control system 305, the exhaust system 306, the rotating system 308, the heating system 310, the first electromagnetic valve 314, the second electromagnetic valve 316, the electric push rod 413 and the mechanical load mechanism 5 are all prior art, and their components and use principles are all public technology, which will not be explained here.

[0043] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for testing the thermal fatigue life of die-casting molds, comprising a testing body (1) and a control platform (2), characterized in that: The top of the testing machine body (1) is provided with a material thermal fatigue testing component (3) and a mechanical load mechanism (5), and both outer surfaces of the material thermal fatigue testing component (3) are provided with heat-absorbing components (4). The material thermal fatigue testing component (3) includes a testing box (301). Multiple through holes (311) are provided on both outer surfaces of the testing box (301). Two annular cooling grooves (312) are provided inside the testing box (301). The annular cooling grooves (312) are responsible for cooling the through holes (311) to initially reduce the heat transferred to the heat absorption component (4). Both of the heat-absorbing components (4) include annular air ducts (401). Multiple cold air ducts (403) are fixedly connected to the outer surfaces of the two annular air ducts (401). A heat insulation sleeve (404) is movably fitted on the outer surfaces of the multiple cold air ducts (403). A vacuum chamber (405) and a heat insulation chamber (406) are opened inside the multiple heat insulation chambers (406). A honeycomb porous heat insulation plate (407) is provided inside the multiple heat insulation chambers (406). A metal foil reflector (408) is provided on the outer surface of the multiple honeycomb porous heat insulation plates (407). The heat insulation sleeve (404) is responsible for isolating heat from being transferred to the cold air ducts (403), thereby preventing the cooling gas inside the cold air ducts (403) from absorbing heat and becoming hot.

2. The thermal fatigue life testing equipment for die-casting molds according to claim 1, characterized in that: The inner walls of the multiple heat insulation cavities (406) are coated with a high-reflectivity coating. The cold air duct (403) and the heat insulation sleeve (404) are located on the outer surface of the test box (301) to prevent the cold air duct (403) from being heated when the test box (301) is heated. The two annular air ducts (401) are fixedly connected to the inside of each air inlet duct (402). The outer surfaces of the two annular air ducts (401) are fixedly installed with a fixing plate (409) and an annular plate (410). Four connecting rods (411) are fixedly installed on one side of the outer surface of each of the two annular plates (410). The four connecting rods (411) distributed around the circumference of each of the eight connecting rods (411) form a group. One end of each group of connecting rods (411) is fixedly installed with a push plate (412). An electric push rod (413) is fixedly installed on one side of the outer surface of each of the two push plates (412).

3. The die-casting mold thermal fatigue life testing equipment according to claim 2, characterized in that: Two support rods (414) are movably embedded inside each of the two push plates (412). An mounting plate (415) is fixedly installed between the outer surfaces of each pair of adjacent support rods (414). One end of each of the two electric push rods (413) is fixedly installed on one side of the outer surface of the two mounting plates (415). Seven cold air pipes (403) are distributed around the circumference of each of the multiple cold air pipes (403) as a group. One end of each of the two groups of cold air pipes (403) is fixedly inserted through the outer surface of the two fixed plates (409).

4. The thermal fatigue life testing equipment for die-casting molds according to claim 3, characterized in that: The heat insulation sleeves (404) are distributed in groups of seven per circumference. One end of each group of heat insulation sleeves (404) is installed on the outer surface of one side of two fixed plates (409) by screws. One end of each pair of support rods (414) is movably inserted through the outer surface of two annular plates (410). One end of each pair of support rods (414) is fixedly installed on the outer surface of one side of the detection box (301). The other end of each pair of support rods (414) is fixedly installed on the outer surfaces of both sides of the detection body (1).

5. The thermal fatigue life testing equipment for die-casting molds according to claim 1, characterized in that: The inside of the testing box (301) is fixedly installed with a box panel (302). The inside of the box panel (302) is provided with a testing window (322). Heating systems (310) are provided on both sides inside the testing box (301). A temperature control system (305) is provided at the top of the rear surface of the box panel (302). An exhaust system (306) is provided at the bottom of the rear surface of the box panel (302).

6. The thermal fatigue life testing equipment for die-casting molds according to claim 5, characterized in that: The rear surface of the detection box (301) is bolted with a detection plate (303), and the front surface of the detection plate (303) is fixedly mounted with a vision sensor (304). The bottom surface inside the detection box (301) is provided with a rotating system (308), and the top of the rotating system (308) is provided with a lower clamp (309). The bottom end of the mechanical load mechanism (5) is movably connected to an upper clamp (307), and the bottom end of the mechanical load mechanism (5) movably penetrates into the interior of the detection box (301).

7. The thermal fatigue life testing equipment for die-casting molds according to claim 6, characterized in that: Cooling water inlet pipes (313) are fixedly connected to the top surface of the two annular cooling tanks (312). A first solenoid valve (314) is provided on the outer surface of the two cooling water inlet pipes (313). Cold water drain pipes (315) are fixedly connected to the bottom surface of the two annular cooling tanks (312). A second solenoid valve (316) is provided on the outer surface of the two cold water drain pipes (315). Multiple movable slots (317) are opened on both sides of the inside of the detection box (301). A fixing rod (318) is fixedly installed inside the multiple movable slots (317).

8. The die-casting mold thermal fatigue life testing equipment according to claim 7, characterized in that: Each of the fixed rods (318) has a movable flap (319) movably fitted on its outer surface. Each of the movable flaps (319) has a gravity block (320) fixedly installed at the bottom of one side of its outer surface. Each of the movable flaps (319) has a heat insulation pad (321) fixedly connected to the other side of its outer surface. Each of the heat insulation pads (321) has seven heat insulation pads (321) distributed around its circumference as a group.

9. The thermal fatigue life testing equipment for die-casting molds according to claim 8, characterized in that: One outer surface of each of the two sets of heat insulation pads (321) contacts the two sides inside the test box (301). The movable flip cover (319) covers the insertion hole (311) and seals the insertion hole (311) with the heat insulation pad (321) to prevent heat from being lost from the insertion hole (311) when the inside of the test box (301) is heated.

10. The thermal fatigue life testing equipment for die-casting molds according to claim 9, characterized in that: The front surface of the test box (301) is provided with a sealed door. The bottom of the test box (301) and the bottom of the rotating system (308) are both fixedly installed on the top of the test body (1). The multiple insertion holes (311) are distributed in groups of seven per circumference. The two annular cooling grooves (312) are located at the two groups of insertion holes (311) respectively. One end of the two cooling water inlet pipes (313) and one end of the two cold water drain pipes (315) are fixedly inserted through to the outer surface of the test box (301).

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