A molding die for polymer material fracture toughness specimen

Abstract

The present invention belongs to the technical field of molding dies for polymer material sample products, and specifically discloses a molding die for polymer material fracture toughness samples, including a lower hollow mold, both sides of the lower hollow mold are fixedly connected with a sliding shell, the top of the lower hollow mold is provided with an upper hollow mold, both sides of the upper hollow mold are fixedly connected with a sliding bar, the sliding bar is slidably connected inside the sliding shell, the bottom of the lower hollow mold is provided with a cooling mechanism, the cooling mechanism is used to quickly cool the mold, the interior of the lower hollow mold is provided with an anti-burr mechanism, the anti-burr mechanism is used to reduce burrs after the pattern is formed. Through the cooling mechanism, the mold is provided with air cooling and water cooling, and the mold can be quickly cooled under the condition of double heat dissipation, thereby improving the efficiency of heat dissipation, shortening the cooling time of the polymer material in the mold, and then improving the efficiency of the polymer material fracture toughness test.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer material sample product molding dies, and specifically discloses a molding die for a polymer material fracture toughness sample. Background Art

[0002] The fracture toughness of polymer materials refers to the ability of the material to resist crack propagation when subjected to external forces. This is an important indicator for evaluating the material's impact resistance and crack growth resistance in practical applications.

[0003] The mold tooling ensures that the specimen has a consistent size and shape, which is critical to obtaining accurate and repeatable fracture toughness test results. The mold design usually needs to take into account the specific processing requirements of the material, such as injection molding, compression molding or extrusion molding.

[0004] In the prior art, the molding mold for the fracture toughness specimen of the injection-molded polymer material generally needs to melt the polymer material before injection, so it has a certain amount of heat. In the prior art, the polymer material is mainly placed after injection for natural cooling, which has a long cooling time and low cooling efficiency, thereby reducing the efficiency of the fracture toughness test of the polymer material. Summary of the invention

[0005] In view of this, the purpose of the present invention is to propose a molding die for polymer fracture toughness test specimens to solve the problem in the prior art that the molding die is naturally cooled, the cooling time is long, the cooling efficiency is low, and the efficiency of the polymer fracture toughness test is reduced.

[0006] To achieve the above objectives, the present invention provides a molding die for a fracture toughness specimen of a polymer material, comprising a lower hollow mold, both sides of the lower hollow mold are fixedly connected with a sliding shell, the top of the lower hollow mold is provided with an upper hollow mold, both sides of the upper hollow mold are fixedly connected with sliding bars, the sliding bars are slidably connected to the inside of the sliding shell, a cooling mechanism is provided at the bottom of the lower hollow mold, the cooling mechanism is used to quickly cool the mold, an anti-burr mechanism is provided inside the lower hollow mold, the anti-burr mechanism is used to reduce burrs after the specimen is molded, and a combination mechanism is externally threadedly connected to one end of the lower hollow mold and the upper hollow mold, and the combination mechanism is used to fix the splicing between the lower hollow mold and the upper hollow mold.

[0007] In the above technical solution, preferably, the cooling mechanism includes two mounting shells, the interior of the mounting shells is rotatably connected with an impeller, the upper and lower ends of the impeller are fixedly connected with a rotating shaft, the outer parts of the two rotating shafts are rotatably connected to the upper and lower ends of the mounting shells respectively, the top of the upper rotating shaft is fixedly connected with a cooling fan inside the mold, the bottom of the lower rotating shaft is fixedly connected with a fin cooling fan, the top of the cooling fan inside the mold is rotatably connected to the bottom of the lower hollow mold, the bottom of the lower hollow mold is fixedly connected with heat dissipation fins, the bottom of the lower hollow mold is located on one side of the cooling fan inside the mold and is fixedly connected with a water pump, the bottom of the cooling fins is fixedly connected with a water tank, and a connection is fixedly connected between the input end of the water pump and the outside of the water tank. Taking over the pipe, the interiors of the lower hollow mold and the upper hollow mold are fixedly connected with a water-cooled annular winding pipe, the output end of the water pump is fixedly connected to one end of one of the water-cooled annular winding pipes through a pipeline, the other end of one of the water-cooled annular winding pipes is threadedly connected with a U-shaped connecting pipe, the top of the U-shaped connecting pipe is threadedly connected to one end of the other water-cooled annular winding pipe, the other end of the other water-cooled annular winding pipe is threadedly connected with a connecting water outlet pipe, the bottom of the connecting water outlet pipe is fixedly connected to the outside of one of the mounting shells, connecting pipes at both ends of the middle are fixedly connected between the two mounting shells, the outside of the other mounting shell is fixedly connected with a heat dissipation return pipe, and the end of the heat dissipation return pipe away from the mounting shell is fixedly connected to the outside of the water tank.

[0008] In the above technical solution, preferably, the anti-burr mechanism includes a ring sleeve, the outside of the ring sleeve is arranged inside the lower hollow mold, the outside of the ring sleeve is fixedly connected with a mounting ring, the outer periphery of the mounting ring is fixedly connected with two fixing ears, and a snap-fit ​​groove is provided inside the side of the upper hollow mold and the lower hollow mold away from the combined mechanism, and the fixing ears are snap-fitted with the snap-fit ​​groove.

[0009] In the above technical scheme, preferably, the combined mechanism includes an anti-slip threaded cover, the inner side thread of the anti-slip threaded cover is connected to the outside of the lower hollow mold and the upper hollow mold, the interior of the anti-slip threaded cover is fixedly connected with an installation fixing cylinder, the interior of the installation fixing cylinder is fixedly connected with a reset spring, the interior of the installation fixing cylinder is slidably connected with a limiting sliding block, the end of the limiting sliding block away from the reset spring is fixedly connected with a top plate, and the interior of the lower hollow mold and the upper hollow mold away from the anti-burr mechanism are both fixedly connected with a blocking semicircular ring.

[0010] In the above technical solution, preferably, an air outlet is fixedly connected to the top of the upper hollow mold, and the side of the return spring close to the lower hollow mold is fixedly connected to the side of the limiting sliding block away from the top plate.

[0011] In the above technical solution, preferably, the fin cooling fan is arranged above the water tank, and a protective pad is provided at the bottom of the water tank.

[0012] In the above technical solution, preferably, the outside of the heat dissipation return pipe is arranged inside the heat dissipation fins, and waterproof pads are arranged inside both ends of the U-shaped connecting pipe.

[0013] In the above technical solution, preferably, the top plate passes through one end of the installation and fixing cylinder close to the lower hollow mold, and a sealing gasket is provided at one end of the top plate away from the limiting sliding block.

[0014] In the above technical solution, preferably, the two engaging grooves are centrally symmetrically arranged, and the two fixing ears are symmetrically arranged on the mounting ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention realizes self-contained air cooling and water cooling on the mold through the cooling mechanism, and can quickly dissipate heat of the mold under the condition of double heat dissipation, thereby improving the efficiency of heat dissipation, shortening the cooling time of the polymer material in the mold, and having high cooling efficiency, thereby improving the efficiency of the fracture toughness test of the polymer material.

[0017] The present invention can reduce the gap when the upper and lower molds are spliced ​​through the anti-burr mechanism, thereby reducing the burrs of the polymer material after molding and improving the quality after molding. At the same time, the combination mechanism can realize the combination and disassembly of the mold without bolts, thereby improving the demolding speed of the molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The three-dimensional Figure 1 ;

[0019] Figure 2 The three-dimensional Figure 2 ;

[0020] Figure 3 It is a structural schematic diagram of the lower hollow mold in the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the water-cooled annular winding pipe in the present invention;

[0022] Figure 5 It is a structural schematic diagram of the impeller in the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the anti-slip threaded cover in the present invention;

[0024] Figure 7 It is a schematic diagram of the structure of the top plate in the present invention;

[0025] Figure 8 It is a schematic diagram of the structure of the blocking semicircular ring in the present invention;

[0026] Fig. 9 It is a structural schematic diagram of the engaging groove in the present invention;

[0027] Fig.10 It is a schematic diagram of the structure of the fixing ear in the present invention.

[0028] In the figure: 1, lower hollow mold; 2, sliding shell; 3, upper hollow mold; 4, sliding strip; 5, cooling mechanism; 501, mounting shell; 502, impeller; 503, rotating shaft; 504, cooling fan inside mold; 505, fin cooling fan; 506, cooling fin; 507, water pump; 508, connecting pipe; 509, water tank; 510, water cooling annular winding pipe; 511, U-shaped connecting pipe; 5 12. Connect the water outlet pipe; 513. Connect the pipes at both ends of the middle; 514. Heat dissipation return pipe; 6. Anti-burr mechanism; 601. Ring sleeve; 602. Mounting ring; 603. Fixing ear; 604. Engaging groove; 7. Combination mechanism; 701. Anti-slip threaded cover; 702. Mounting fixing cylinder; 703. Reset spring; 704. Limit sliding block; 705. Top plate; 706. Blocking semicircular ring; 8. Air outlet nozzle. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figure 1-Figure 10A molding die for a fracture toughness specimen of a polymer material shown in the figure comprises a lower hollow mold 1, both sides of the lower hollow mold 1 are fixedly connected with a sliding shell 2, an upper hollow mold 3 is arranged on the top of the lower hollow mold 1, both sides of the upper hollow mold 3 are fixedly connected with sliding bars 4, the sliding bars 4 are slidably connected inside the sliding shell 2, a cooling mechanism 5 is arranged at the bottom of the lower hollow mold 1, the cooling mechanism 5 is used to quickly cool the mold, an anti-burr mechanism 6 is arranged inside the lower hollow mold 1, the anti-burr mechanism 6 is used to reduce burrs after the specimen is molded, one end of the lower hollow mold 1 and the upper hollow mold 3 are externally threadedly connected with a combination mechanism 7, the combination mechanism 7 is used to fix the splicing between the lower hollow mold 1 and the upper hollow mold 3, and when installing, first Align the sliding bar 4 with the interior of the sliding shell 2 and push it in, and then the upper hollow mold 3 can be installed on the top of the lower hollow mold 1, and then the anti-burr mechanism 6 is placed in the interior of the space formed by the lower hollow mold 1 and the upper hollow mold 3, and the polymer material is melted and poured into the interior of the space formed by the lower hollow mold 1, the upper hollow mold 3 and the anti-burr mechanism 6, and the combination mechanism 7 is screwed on the outside of the lower hollow mold 1 and the upper hollow mold 3. When disassembling, the anti-slip threaded cover 701 is unscrewed from the lower hollow mold 1 and the upper hollow mold 3, and then the upper hollow mold 3 can be moved away from the combination mechanism 7, and then the sliding bar 4 can be driven to slide out from the interior of the sliding shell 2, and then the upper hollow mold 3 can be removed from the lower hollow mold 1;

[0032] The cooling mechanism 5 includes two mounting shells 501, which can provide a location for mounting and passing water. The mounting shells 501 are internally rotatably connected with an impeller 502, which can rotate under the drive of water flow. The upper and lower ends of the impeller 502 are fixedly connected with a rotating shaft 503, which plays a connecting role. The outer parts of the two rotating shafts 503 are rotatably connected to the upper and lower ends of the mounting shells 501 respectively. The top of the upper rotating shaft 503 is fixedly connected with a mold internal cooling fan 504, which can blow air into the interior of the lower hollow mold 1 and the interior of the upper hollow mold 3 to achieve air cooling. The bottom of the lower rotating shaft 503 is fixedly connected with a fin cooling fan 505, which The top of the cooling fan 504 inside the mold is rotatably connected to the bottom of the lower hollow mold 1. The bottom of the lower hollow mold 1 is fixedly connected with a cooling fin 506. The cooling fin 506 can accelerate the heat dissipation of the liquid in the pipeline. The bottom of the lower hollow mold 1 is located on one side of the cooling fan 504 inside the mold and is fixedly connected with a water pump 507. The water pump 507 can provide power for the flow of water. The bottom of the cooling fin 506 is fixedly connected with a water tank 509. The water tank 509 can store water. A connecting pipe 508 is fixedly connected between the input end of the water pump 507 and the outside of the water tank 509. The interiors of the lower hollow mold 1 and the upper hollow mold 3 are fixedly connected with a water-cooled annular winding pipe 510. The water-cooled annular winding pipe 510 can be wound around the lower hollow mold 1 and the upper hollow mold 3. Inside the core mold 3, when the inside of the water-cooled annular winding tube 510 is filled with water, water-cooled heat dissipation can be achieved. The output end of the water pump 507 is fixedly connected to one end of one of the water-cooled annular winding tubes 510 through a pipeline. The other end of one of the water-cooled annular winding tubes 510 is threadedly connected with a U-shaped connecting pipe 511. The U-shaped connecting pipe 511 can connect the two water-cooled annular winding tubes 510. The top of the U-shaped connecting pipe 511 is threadedly connected to one end of another water-cooled annular winding tube 510. The other end of the other water-cooled annular winding tube 510 is threadedly connected with a connecting water outlet pipe 512. The connecting water outlet pipe 512 can connect the water channel between the water-cooled annular winding tube 510 and the installation shell 501. The bottom of the connecting water outlet pipe 512 is fixedly connected therein. The outside of one mounting shell 501, the two mounting shells 501 are fixedly connected with a connecting pipe 513 at both ends of the middle part, and the outside of another mounting shell 501 is fixedly connected with a heat dissipation return pipe 514, and the heat dissipation fins 506 can accelerate the heat dissipation of the water flow in the heat dissipation return pipe 514, so as to achieve a better water-cooled heat dissipation effect. The heat dissipation return pipe 514 is fixedly connected to the outside of the water tank 509 at one end away from the mounting shell 501, and the fin cooling fan 505 is arranged above the water tank 509, and a protective pad is arranged at the bottom of the water tank 509. The outside of the heat dissipation return pipe 514 is arranged inside the heat dissipation fins 506, and waterproof pads are arranged inside both ends of the U-shaped connecting pipe 511. When pouring the sample, rapid cooling is required due to the high internal temperature.First, start the water pump 507. The output end of the water pump 507 draws liquid from the water tank 509 through the connecting pipe 508, and draws it into the interior of the water-cooled annular winding pipe 510 through the output end. The liquid is passed into another water-cooled annular winding pipe 510 through the U-shaped connecting pipe 511, so that the water-cooled annular winding pipe 510 can be used to water-cool the interior of the lower hollow mold 1 and the upper hollow mold 3. The liquid in the water-cooled annular winding pipe 510 enters the interior of the installation shell 501 through the connecting water outlet pipe 512, and then drives the impeller 502 to rotate, and enters another installation shell 501 through the connecting pipes 513 at both ends of the middle, and then can drive the other impeller 502 to rotate, so that The rotating shaft 503 can be driven to rotate, and the cooling fan 504 inside the mold can be driven to rotate through the rotating shaft 503. When the cooling fan 504 inside the mold rotates, wind can be generated. The wind enters the interior of the upper hollow mold 3 from the interior of the lower hollow mold 1 and is discharged from the air outlet 8 to achieve air-cooled heat dissipation. At the same time, the fin cooling fan 505 can be driven to rotate through the rotating shaft 503 to generate wind, which can then dissipate heat for the heat dissipation fins 506. In addition, the liquid in the mounting shell 501 will enter the interior of the heat dissipation return pipe 514, and the wind generated by the heat dissipation fins 506 can dissipate heat for the liquid in the heat dissipation return pipe 514, thereby achieving dual heat dissipation of air cooling and water cooling;

[0033] The anti-burr mechanism 6 includes a ring sleeve 601, which can provide a space for filling liquid and reduce the gap between the lower hollow mold 1 and the upper hollow mold 3, thereby reducing burrs. The outside of the ring sleeve 601 is arranged inside the lower hollow mold 1, and the outside of the ring sleeve 601 is fixedly connected with a mounting ring 602. The outer periphery of the mounting ring 602 is fixedly connected with two fixing ears 603. A snap-fit ​​groove 604 is provided inside the side of the upper hollow mold 3 and the lower hollow mold 1 away from the combination mechanism 7. The combination of the fixing ear 603 and the snap-fit ​​groove 604 can facilitate the installation of the mounting ring 602, and then facilitate the installation of the ring sleeve 601. The fixing ear 603 is snap-fitted with the snap-fit ​​groove 604. The two snap-fit ​​grooves 604 are arranged symmetrically between the center, and the two fixing ears 603 are symmetrically arranged on the mounting ring 602. After the lower hollow mold 1 and the upper hollow mold 3 are assembled, the ring sleeve 601 is inserted into the lower hollow mold 1 and the interior of the upper hollow mold 3, and align the fixing ear 603 with the opening of the locking groove 604, push the fixing ear 603 into the interior of the opening of the locking groove 604, rotate the mounting ring 602 clockwise, and the mounting ring 602 can be fixed to the side of the lower hollow mold 1 and the upper hollow mold 3 away from the combination mechanism 7, and then the ring sleeve 601 can be installed in the space formed by the lower hollow mold 1 and the upper hollow mold 3. When disassembling, first rotate the mounting ring 602, and the mounting ring 602 rotates counterclockwise to drive the fixing ear 603 to rotate to the opening of the locking groove 604. At this time, the mounting ring 602 can be moved in the direction away from the combination mechanism 7, and then the mounting ring 602 can be driven to move out of the locking groove 604, and then the ring sleeve 601 can be moved out of the space formed by the lower hollow mold 1 and the upper hollow mold 3, and the polymer material can be poured out of the inside of the ring sleeve 601;

[0034] The assembly mechanism 7 includes an anti-skid threaded cover 701, which can be convenient for fixing the lower hollow mold 1 and the upper hollow mold 3 after splicing. The inner side of the anti-skid threaded cover 701 is threadedly connected to the outer side of the lower hollow mold 1 and the upper hollow mold 3. The interior of the anti-skid threaded cover 701 is fixedly connected with a mounting fixing cylinder 702, which provides a mounting position. The interior of the mounting fixing cylinder 702 is fixedly connected with a return spring 703, and the interior of the mounting fixing cylinder 702 is slidably connected to the lower hollow mold 1 and the upper hollow mold 3. A limiting slide block 704 is connected, which plays a role of limiting. One end of the limiting slide block 704 away from the return spring 703 is fixedly connected to a top plate 705. The lower hollow mold 1 and the upper hollow mold 3 are fixedly connected to a blocking semicircular ring 706 on the side away from the anti-burr mechanism 6. The top of the upper hollow mold 3 is fixedly connected to an air outlet nozzle 8. The side of the return spring 703 close to the lower hollow mold 1 is fixedly connected to the side of the limiting slide block 704 away from the top plate 705. The top plate 705 penetrates the end of the installation fixing cylinder 702 close to the lower hollow mold 1, and a sealing gasket is provided at the end of the top plate 705 away from the limit sliding block 704. After the lower hollow mold 1 and the upper hollow mold 3 are assembled, the blocking semicircular ring 706 is placed upward, and then the anti-slip threaded cover 701 is screwed on the outside of the lower hollow mold 1 and the upper hollow mold 3. When the anti-slip threaded cover 701 is tightened, the side of the installation fixing cylinder 702 close to the fixing ear 603 will be tightly against the blocking semicircular ring 706. On the side near the anti-slip threaded cover 701, since there is a polymer material inside the space formed by the lower hollow mold 1 and the upper hollow mold 3, the elastic action of the reset spring 703 can give the limiting sliding block 704 a force toward the locking groove 604, thereby giving the top plate 705 a force toward the locking groove 604, and then the top plate 705 can squeeze the air in the internal material of the space formed by the lower hollow mold 1 and the upper hollow mold 3, thereby preventing the sample from being dented and improving the quality of the sample.

[0035] Working principle: When installing, first align the sliding bar 4 with the inside of the sliding shell 2 and push it in, and then the upper hollow mold 3 can be installed on the top of the lower hollow mold 1, and then the anti-burr mechanism 6 is placed in the interior of the space formed by the lower hollow mold 1 and the upper hollow mold 3, and the melted polymer material is poured into the interior of the space formed by the lower hollow mold 1, the upper hollow mold 3 and the anti-burr mechanism 6, and the combination mechanism 7 is screwed on the outside of the lower hollow mold 1 and the upper hollow mold 3. When disassembling, unscrew the anti-slip threaded cover 701 from the lower hollow mold 1 and the upper hollow mold 3, and then the upper hollow mold 3 can be moved away from the combination mechanism 7, and then the sliding bar 4 can be driven to slide out from the inside of the sliding shell 2, and then the upper hollow mold 3 can be removed from the lower hollow mold 1;

[0036] When pouring the sample, rapid cooling is required due to the high internal temperature. First, the water pump 507 is started. The output end of the water pump 507 draws liquid from the water tank 509 through the connecting pipe 508, and draws it into the interior of the water-cooled annular winding pipe 510 through the output end. The liquid is passed into another water-cooled annular winding pipe 510 through the U-shaped connecting pipe 511, so that the water-cooled annular winding pipe 510 can be used to water-cool the interior of the lower hollow mold 1 and the upper hollow mold 3. The liquid in the water-cooled annular winding pipe 510 enters the interior of the installation shell 501 through the connecting water outlet pipe 512, and then drives the impeller 502 to rotate, and enters another installation shell 501 through the connecting pipes 513 at both ends of the middle, and then can drive the other The impeller 502 rotates, thereby driving the rotating shaft 503 to rotate, and the rotating shaft 503 drives the cooling fan 504 inside the mold to rotate. When the cooling fan 504 inside the mold rotates, wind force can be generated. The wind force enters the interior of the upper hollow mold 3 from the interior of the lower hollow mold 1, and is discharged from the air outlet 8 to achieve air cooling and heat dissipation. At the same time, the fin cooling fan 505 can be driven by the rotating shaft 503 to rotate to generate wind force, which can then dissipate heat for the heat dissipation fins 506. In addition, the liquid in the mounting shell 501 will enter the interior of the heat dissipation return pipe 514, and the wind force generated by the heat dissipation fins 506 can dissipate heat for the liquid in the heat dissipation return pipe 514, thereby achieving dual heat dissipation of air cooling and water cooling;

[0037] After the lower hollow mold 1 and the upper hollow mold 3 are assembled, the ring sleeve 601 is inserted into the lower hollow mold 1 and the upper hollow mold 3, and the fixing ear 603 is aligned with the opening of the snap-fit ​​groove 604, and the fixing ear 603 is pushed into the opening of the snap-fit ​​groove 604. The mounting ring 602 is rotated clockwise to fix the mounting ring 602 on the side of the lower hollow mold 1 and the upper hollow mold 3 away from the combination mechanism 7, and then the ring sleeve 601 can be installed in the space formed by the lower hollow mold 1 and the upper hollow mold 3. During disassembly, the mounting ring 602 is first rotated, and the mounting ring 602 rotates counterclockwise to drive the fixing ear 603 to rotate to the opening of the engaging groove 604. At this time, the mounting ring 602 can be moved away from the assembly mechanism 7, and then the mounting ring 602 can be driven to move out of the engaging groove 604, and then the ring sleeve 601 can be moved out of the space formed by the lower hollow mold 1 and the upper hollow mold 3. At this time, the polymer material can be poured out of the ring sleeve 601.

[0038] After the lower hollow mold 1 and the upper hollow mold 3 are assembled, the blocking semicircular ring 706 is placed upwards, and then the anti-skid threaded cover 701 is screwed on the outside of the lower hollow mold 1 and the upper hollow mold 3. After the anti-skid threaded cover 701 is tightened, the side of the installation fixing tube 702 close to the fixing ear 603 will tightly press against the side of the blocking semicircular ring 706 close to the anti-skid threaded cover 701. Since there is a polymer material inside the space formed by the lower hollow mold 1 and the upper hollow mold 3, the elastic action of the return spring 703 can give the limiting sliding block 704 a force toward the locking groove 604, thereby giving the top plate 705 a force toward the locking groove 604, and then the top plate 705 can squeeze the air in the internal material of the space formed by the lower hollow mold 1 and the upper hollow mold 3.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A molding die for a polymer material fracture toughness specimen, comprising a lower hollow mold (1), characterized in that: Both sides of the lower hollow mold (1) are fixedly connected with a sliding shell (2), the top of the lower hollow mold (1) is provided with an upper hollow mold (3), both sides of the upper hollow mold (3) are fixedly connected with sliding bars (4), the sliding bars (4) are slidably connected to the inside of the sliding shell (2), the bottom of the lower hollow mold (1) is provided with a cooling mechanism (5), the cooling mechanism (5) is used to quickly cool the mold, the inside of the lower hollow mold (1) is provided with an anti-burr mechanism (6), the anti-burr mechanism (6) is used to reduce burrs after the sample is formed, and one end of the lower hollow mold (1) and the upper hollow mold (3) are externally threadedly connected with a combination mechanism (7), the combination mechanism (7) is used to fix the splicing between the lower hollow mold (1) and the upper hollow mold (3); The anti-burr mechanism (6) comprises a ring sleeve (601), the outside of the ring sleeve (601) is arranged inside the lower hollow mold (1), the outside of the ring sleeve (601) is fixedly connected to a mounting ring (602), the outer periphery of the mounting ring (602) is fixedly connected to two fixing ears (603), and a clamping groove (604) is provided inside the side of the upper hollow mold (3) and the lower hollow mold (1) away from the combined mechanism (7), and the fixing ears (603) are clamped with the clamping groove (604); The combined mechanism (7) comprises an anti-slip threaded cover (701), the inner side of the anti-slip threaded cover (701) is threadedly connected to the outside of the lower hollow mold (1) and the upper hollow mold (3), the interior of the anti-slip threaded cover (701) is fixedly connected to a mounting and fixing cylinder (702), the interior of the mounting and fixing cylinder (702) is fixedly connected to a return spring (703), the interior of the mounting and fixing cylinder (702) is slidably connected to a limit sliding block (704), one end of the limit sliding block (704) away from the return spring (703) is fixedly connected to a top plate (705), and the interior of the lower hollow mold (1) and the upper hollow mold (3) away from the anti-burr mechanism (6) are both fixedly connected to a blocking semicircular ring (706); The top of the upper hollow mold (3) is fixedly connected with an air outlet nozzle (8), and the side of the return spring (703) close to the lower hollow mold (1) is fixedly connected to the side of the limiting sliding block (704) away from the top plate (705).

2. A molding die for polymer material fracture toughness specimen according to claim 1, characterized in that: The cooling mechanism (5) comprises two mounting shells (501), the interior of the mounting shells (501) is rotatably connected to an impeller (502), the upper and lower ends of the impeller (502) are fixedly connected to a rotating shaft (503), the exteriors of the two rotating shafts (503) are rotatably connected to the upper and lower ends of the mounting shells (501), the top of the upper rotating shaft (503) is fixedly connected to a cooling fan (504) inside the mold, and the bottom of the lower rotating shaft (503) is fixedly connected to a fin cooling fan (505), the top of the cooling fan (504) inside the mold is rotatably connected to the bottom of the lower hollow mold (1), the bottom of the lower hollow mold (1) is fixedly connected with a cooling fin (506), the bottom of the lower hollow mold (1) is located on one side of the cooling fan (504) inside the mold and is fixedly connected with a water pump (507), the bottom of the cooling fin (506) is fixedly connected with a water tank (509), and a connecting pipe (507) is fixedly connected between the input end of the water pump (507) and the outside of the water tank (509). 08), the interiors of the lower hollow mold (1) and the upper hollow mold (3) are both fixedly connected with a water-cooled annular winding pipe (510), the output end of the water pump (507) is fixedly connected to one end of one of the water-cooled annular winding pipes (510) through a pipeline, the other end of one of the water-cooled annular winding pipes (510) is threadedly connected to a U-shaped connecting pipe (511), the top of the U-shaped connecting pipe (511) is threadedly connected to one end of another water-cooled annular winding pipe (510), and the other water-cooled annular winding pipe (510) is threadedly connected to one end of another water-cooled annular winding pipe (510). The other end of the shaped winding tube (510) is threadedly connected to a connecting water outlet pipe (512), the bottom of the connecting water outlet pipe (512) is fixedly connected to the outside of one of the mounting shells (501), a connecting pipe (513) at both ends of the middle is fixedly connected between the two mounting shells (501), and a heat dissipation return pipe (514) is fixedly connected to the outside of the other mounting shell (501), and one end of the heat dissipation return pipe (514) away from the mounting shell (501) is fixedly connected to the outside of the water tank (509).

3. A molding die for polymer material fracture toughness specimen according to claim 2, characterized in that: The fin cooling fan (505) is arranged above the water tank (509), and a protective pad is arranged at the bottom of the water tank (509).

4. A molding die for polymer material fracture toughness specimen according to claim 2, characterized in that: The exterior of the heat dissipation water return pipe (514) is arranged inside the heat dissipation fins (506), and waterproof pads are arranged inside both ends of the U-shaped connecting pipe (511).

5. The molding die for polymer material fracture toughness test specimen according to claim 1, characterized in that: The top plate (705) passes through one end of the mounting and fixing cylinder (702) close to the lower hollow mold (1), and a sealing gasket is provided at one end of the top plate (705) away from the limiting sliding block (704).

6. A molding die for polymer material fracture toughness specimen according to claim 1, characterized in that: The two engaging grooves (604) are centrally symmetrically arranged, and the two fixing ears (603) are symmetrically arranged on the mounting ring (602).

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