A casting mold and process for facilitating the production of castings

Abstract

The application relates to the field of casting molds, in particular to a casting mold facilitating mold stripping for casting production, which comprises a base, the top end of the base is fixedly connected with a first driving platform, the top end of the first driving platform is symmetrically and slidably connected with two sliding frames, the compression cavity, the compression seat, the first rack, the gear and the second rack are arranged, when the sliding frames continue to compress the first spring during mold closing, the second rack drives the first rack and the compression seat to move through the gear, negative pressure is generated in the compression cavity and the open cavity, the gas generated when the metal melt fills is continuously sucked and discharged, the defects such as pores and empty bags on the surface or in the interior of the casting are avoided, and the casting forming quality is improved; meanwhile, positive pressure is generated in the compression cavity during mold opening, the contact surface between the sand core and the inner wall of the mold cavity is blown by the gas, the adhesion generated due to high-temperature sintering is reduced, and therefore the sand core can be smoothly stripped.

Description

Technical Field

[0001] This invention relates to the field of casting molds, and more particularly to a casting mold for easy demolding of castings. Background Technology

[0002] Sand core casting is a commonly used forming process in the production of high-quality copper castings. The basic process involves placing the sand core between the moving and stationary molds, closing the mold, pouring molten metal into the cavity, and then opening the mold after cooling and solidification to remove the sand core and the casting. With the increasing complexity of casting structures and the accelerating production cycle, the ease of mold release and reliability have become key factors affecting production efficiency and product quality.

[0003] However, existing castings typically have the following shortcomings during the pouring process: For example, during the process of molten metal filling the mold cavity, the gas carried inside the cavity and by the molten metal itself is difficult to expel quickly and completely, which can easily lead to defects such as pores and voids on the surface or inside the casting, thus reducing the quality of the casting. Secondly, during the mold opening stage after the casting has cooled and solidified, the sand core and the inner wall of the mold cavity often have a large adhesion due to high-temperature sintering, which increases the difficulty of demolding.

[0004] To address these issues, this invention proposes a casting mold and process for easy production of castings. Summary of the Invention

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a casting mold for easy casting production, comprising: a base, wherein a first driving platform is fixedly connected to the top of the base, and two sliding frames are symmetrically slidably connected to the top of the first driving platform; The moving mold and the stationary mold are slidably connected to the sliding frame at the corresponding positions. A first spring is fixedly connected between the moving mold and the stationary mold and the sliding frame. Open cavities are opened in both the moving mold and the stationary mold. Air grooves are arrayed on the side of the open cavity near the sand core. A compression chamber is provided, which is located inside the moving mold and is connected to the air passage of the open cavity. A compression seat is slidably connected inside the compression chamber. A first rack is fixedly connected to the end of the compression seat. A gear is meshed on the top surface of the first rack. The gear is rotatably connected to the outer wall of the moving mold. A second rack is meshed on the top of the gear. The second rack is fixedly connected to the sliding frame. Both the moving mold and the stationary mold are equipped with an ejection mechanism. The ejection mechanism is used to eject and position the sand core during the separation of the moving mold and the stationary mold, so as to achieve the demolding of the sand core.

[0006] Preferably, the ejection mechanism includes several air chambers, which are symmetrically arranged in the moving mold and the stationary mold. The air chambers are connected to the air passage of the open cavity. An air inlet check valve is provided at the connection between the air chamber and the air passage of the open cavity. A pressure relief valve is provided at the end of the air chamber. A piston block is slidably and sealed within the air chamber, and a second spring is fixedly connected between the piston block and the air chamber. A push rod is slidably sleeved on the rod of the piston block. A third spring is fixedly connected between the push rod and the rod of the piston block. The end of the push rod is in contact with the sand core.

[0007] Preferably, it also includes an L-shaped support frame, which is fixedly connected to the top of the base, and a second drive platform is fixedly connected to the bottom of the L-shaped support frame; The adsorption seat is slidably connected to the bottom end of the second drive platform, and the top of both the moving mold and the stationary mold are provided with relief grooves that are adapted to the adsorption seat. Several suction nozzles, an array of several suction nozzles, are arranged on the adsorption seat for adsorbing sand cores when the moving mold and the stationary mold are separated.

[0008] Preferably, it also includes several storage slots, and the several storage slots are opened on the suction base corresponding to the positions of the suction nozzles; The gas shell is slidably connected inside the adsorption seat, and the gas shell is fixedly connected to several of the suction nozzles. Two piston plates are symmetrically and slidably connected at both ends inside the gas shell. The pushing mechanism drives the air shell to move downward during the separation of the moving mold and the stationary mold, so that the suction nozzle contacts the sand core, and then drives the two piston plates to move, so that the suction nozzle generates negative pressure and adsorbs the sand core.

[0009] Preferably, the pushing mechanism includes two connecting frames, one end of each connecting frame passes through both ends of the gas shell and is fixedly connected to two piston plates respectively, and the other end of each connecting frame is provided with a first inclined groove symmetrically on both sides; Two U-shaped drive frames are symmetrically and slidably connected to the side wall of the adsorption seat. The two ends of the U-shaped drive frames are slidably connected to the first inclined groove. A fourth spring is fixedly connected between the two ends of the U-shaped drive frames and the side wall of the first inclined groove. A pushing component drives two U-shaped drive frames to move downwards during the separation of the moving mold and the stationary mold.

[0010] Preferably, the actuating component includes: Two sliding seats are symmetrically slidably connected to a U-shaped drive frame. A fifth spring is fixedly connected between the sliding seats and the U-shaped drive frame. Second inclined grooves are symmetrically opened on both sides of the sliding seats, and a first guide inclined surface is opened at the top of the sliding seats. A driving pin is slidably connected in the second inclined groove and fixedly connected to the side wall of the adsorption seat. The top of the moving mold and the stationary mold are both fixedly connected to the sliding seat with L-shaped fixing frames. The top of the L-shaped fixing frame is slidably connected to a pushing block. The bottom of the pushing block is provided with a first pushing slope that matches the guide slope. A sixth spring is fixedly connected between the pushing block and the L-shaped fixing frame. A locking mechanism that limits the movement of the U-shaped drive frame when the U-shaped drive frame moves to its bottommost position.

[0011] Preferably, the snap-fit ​​mechanism includes a snap-fit ​​seat, which is disposed on the adsorption seat. The snap-fit ​​seat has a snap-fit ​​groove on its side wall and a second guide slope above the snap-fit ​​groove. A snap-fit ​​block is slidably connected to a U-shaped drive frame, and an eighth spring is fixedly connected between the snap-fit ​​block and the U-shaped drive frame. A second pushing slope is provided at the bottom end of the snap-fit ​​block.

[0012] Preferably, the snap-fit ​​seat is slidably connected to the adsorption seat, a seventh spring is fixedly connected between the snap-fit ​​seat and the adsorption seat, a magnet is fixedly connected to the side wall of the snap-fit ​​seat, and an induction electromagnet is fixedly connected to the side wall of the adsorption seat.

[0013] Preferably, a suction cup is fixedly connected to the bottom end of the suction nozzle.

[0014] Preferably, the end of the moving mold is fixedly connected to a sealing plate adapted to the open cavity.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by setting up a compression chamber, a compression seat, a first rack, a gear, and a second rack, allows the second rack to drive the first rack and compression seat to move via the gear while the sliding frame continues to compress the first spring during mold closing. This creates negative pressure in the compression chamber and open cavity, continuously drawing in and expelling the gas generated during the filling of molten metal, thus preventing defects such as porosity and voids on the surface or inside of the casting and improving the casting quality. Simultaneously, positive pressure is generated in the compression chamber during mold opening, and the gas blows through the contact surface between the sand core and the inner wall of the cavity, which helps reduce the adhesion caused by high-temperature sintering, thereby facilitating the smooth demolding of the sand core.

[0016] 2. This invention, by setting up an air chamber, an inlet one-way valve, a pressure relief valve, a piston block, and a second spring, allows some of the gas in the open cavity to enter the air chamber through the inlet one-way valve and store energy when positive pressure is generated in the compression chamber. This allows the third spring to release its elastic force during the separation of the moving mold and the stationary mold, driving the push rod to extend and smoothly push the sand core out of the open cavity and achieve temporary positioning, facilitating accurate gripping by the subsequent adsorption seat. When the exhaust valve is opened, the second spring drives the push rod to automatically retract back to its original position, making room for the next sand core installation.

[0017] 3. This invention, by setting up an adsorption seat, a suction nozzle, a suction cup, an air shell, a storage groove, and a pushing mechanism, allows the suction nozzle and suction cup to be stored in the storage groove in the mold-closed state, away from the surface of the high-temperature sand core, thus avoiding damage to the suction cup due to high temperature; during the mold opening and transportation stage, the pushing mechanism uses the mold opening action to drive the air shell to extend downward so that the suction cup contacts the sand core, and then drives the piston plate to move so that the air shell generates negative pressure to adsorb the sand core, and the second driving platform moves the sand core away from the mold to the cleaning station. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention on the right side; Figure 2 This is a schematic diagram of the overall structure of the present invention from the left side; Figure 3 This is a schematic diagram of the closed state of the moving mold and the stationary mold of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the closed state of the moving mold and the stationary mold of the present invention. Figure 2 ; Figure 5 This is a schematic diagram showing the connection between the moving mold and the sand core of the present invention; Figure 6 This is a schematic diagram showing the connection between the static mold and the sand core in this invention; Figure 7 This is a cross-sectional view of the moving mold and sand core in this invention; Figure 8 This is a cross-sectional view of the moving mold and sand core in this invention; Figure 9 This is a schematic diagram showing the connection between the adsorption seat and the snap-fit ​​seat in this invention; Figure 10 for Figure 9 Enlarged view of point A in the middle; Figure 11 for Figure 9 Enlarged view at point B in the middle; Figure 12 for Figure 9 Enlarged view at point C; Figure 13 This is a cross-sectional view of the adsorption seat and the gas shell in this invention; Figure 14This is a schematic diagram showing the connection between the card holder and the magnet in this invention.

[0019] In the diagram: 1. Base; 2. First drive platform; 3. Sliding frame; 4. First spring; 5. Moving mold; 6. Stationary mold; 7. Relief groove; 8. Open cavity; 8. Sealing plate; 801. Air groove; 802. Compression chamber; 9. Compression seat; 10. First rack; 11. Gear; 12. Second rack; 13. Air chamber; 14. One-way valve; 1401. Pressure relief valve; 1402. Piston block; 15. Second spring; 16. Push rod; 17. Third spring; 18. L-shaped support frame; 19. Second drive platform; 20. Adsorption seat; 21. Receiving... 2101, gas shell 22, suction nozzle 23, suction cup 2301, piston plate 24, connecting frame 25, first inclined groove 2501, U-shaped drive frame 26, fourth spring 27, sliding seat 28, second inclined groove 2801, drive pin 2802, fifth spring 29, L-shaped fixing frame 30, push block 31, sixth spring 32, snap-fit ​​seat 33, snap-fit ​​groove 34, seventh spring 35, magnet 36, induction electromagnet 37, snap-fit ​​block 38, eighth spring 39, sand core 40. Detailed Implementation

[0020] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0021] like Figures 1 to 14 The casting mold shown is for easy production of castings and includes: a base 1, a first driving platform 2 fixedly connected to the top of the base 1, and two sliding frames 3 symmetrically slidably connected to the top of the first driving platform 2. The moving mold 5 and the stationary mold 6 are slidably connected to the sliding frame 3 at the corresponding positions. The moving mold 5 and the stationary mold 6 are fixedly connected to the sliding frame 3. The moving mold 5 and the stationary mold 6 are both provided with open cavities 8. The open cavities 8 are provided with air grooves 802 in an array on the side of the open cavity 8 near the sand core 40. Compression chamber 9 is located inside moving mold 5. Compression chamber 9 is connected to the air passage of open cavity 8. Compression seat 10 is sealed and slidably connected inside compression chamber 9. First rack 11 is fixedly connected to the end of compression seat 10. Gear 12 is meshed on the top surface of first rack 11. Gear 12 is rotatably connected to the outer wall of moving mold 5. Second rack 13 is meshed on the top of gear 12. Second rack 13 is fixedly connected to sliding frame 3. Both the moving mold 5 and the stationary mold 6 are equipped with ejection mechanisms. The ejection mechanisms are used to eject and position the sand core 40 during the separation of the moving mold 5 and the stationary mold 6, so as to achieve demolding of the sand core 40. In existing technologies, during the process of molten metal filling the mold cavity, the gas carried inside the cavity and by the molten metal itself is difficult to expel quickly and completely, easily forming defects such as porosity and voids on the surface or inside the casting, which can reduce the quality of the casting. Secondly, during the mold opening stage after the casting has cooled and solidified, the sand core 40 often exhibits significant adhesion to the inner wall of the mold cavity due to high-temperature sintering, increasing the difficulty of demolding. This technical solution can solve the above problems, and the specific operation is as follows: First, the required sand cores 40 are installed in the moving mold 5 and the stationary mold 6 respectively. Then, the two sliding frames 3 are driven to move closer to each other by the first drive platform 2 (e.g., by a motor-driven lead screw), so that the moving mold 5 and the stationary mold 6 move closer to each other to close the mold. After the ends of the moving mold 5 and the stationary mold 6 come into contact, the first drive platform 2 continues to drive the two sliding frames 3 to move one end distance, compressing the first spring 4 to ensure that the moving mold 5 and the stationary mold 6 are in full contact, thereby improving the mold closing sealing performance. During the process of the two sliding frames 3 moving one distance and compressing the first spring 4, the second rack 13 moves closer to the side wall of the moving mold 5 and drives the gear 12 to rotate, thereby moving the first rack 11. The first rack 11 drives the compression seat 10 to move, thereby reducing the air pressure in the compression chamber 9. Since the compression chamber 9 is connected to the air passage of the open cavity 8, when the air pressure in the compression chamber 9 decreases, the open cavity 8 generates a negative pressure simultaneously. When the molten metal enters the mold through the casting pipe at the stationary mold 6, the generated gas enters the open cavity 8 through the sand core 40, so that the molten metal and the surface of the sand core 40 are in full contact, avoiding the formation of voids on the surface of the casting and improving the quality of the casting. After the casting has cooled and solidified, the first drive platform 2 drives the two sliding frames 3 to move away from each other. During the process of the two sliding frames 3 moving away from each other, the compression force of the first spring 4 is released first. At this time, the positions of the moving mold 5 and the stationary mold 6 remain unchanged, and the second rack 13 moves away from the side wall of the moving mold 5. Under the same working principle, the compression seat 10 moves, causing the compression chamber 9 to generate positive pressure (at this time, the gas content inside the open cavity 8 is greater than the initial value due to the accumulation of gas generated during the filling process of the molten metal). The pressure is used to reduce the adhesion between the sand core 40 and the inner wall of the mold, thereby facilitating the removal of the sand core 40 during demolding.

[0022] It should be noted that the end of the moving mold 5 is fixedly connected with a sealing plate 801 that is compatible with the open cavity 8, so as to improve the sealing performance of the mold after mold closing.

[0023] As a further embodiment of the present invention, the ejection mechanism includes: Several air chambers 14 are symmetrically opened in the moving mold 5 and the stationary mold 6. The air chambers 14 are connected to the air passage of the open cavity 8. An air inlet one-way valve 1401 is provided at the air passage connection between the air chambers 14 and the open cavity 8. A pressure relief valve 1402 is provided at the end of the air chambers 14. Piston block 15 is slidably connected in the air chamber 14, and a second spring 16 is fixedly connected between piston block 15 and air chamber 14. Push rod 17 is slidably sleeved on the rod of piston block 15. A third spring 18 is fixedly connected between push rod 17 and the rod of piston block 15. The end of push rod 17 is in contact with sand core 40. Specifically, during the positive pressure generation process of compression chamber 9, some air pressure inside open chamber 8 enters air chamber 14 through intake check valve 1401 (during the negative pressure generation process of compression chamber 9, intake check valve 1401 is in the closed state), which increases the pressure inside air chamber 14. The air pressure pushes piston block 15 to move, and second spring 16 generates elastic force. During the movement of piston block 15, the rod of piston block 15 pushes third spring 18, causing third spring 18 to generate elastic force at the same time. After the casting cools and solidifies, the first drive platform 2 drives the two sliding frames 3 to move away from each other, the moving mold 5 and the stationary mold 6 begin to separate, the elastic force of the third spring 18 is released, and the push rods 17 on the moving mold 5 and the stationary mold 6 extend respectively, thereby realizing the ejection of the sand core 40 from the mold while temporarily positioning the position of the sand core 40, so as to facilitate subsequent adsorption and transportation by the adsorption seat 21. When the first drive platform 2 drives the two sliding frames 3 to move away from each other, the exhaust valve (e.g., a solenoid valve or a ball valve that is manually opened and closed) is activated, so that the air pressure in the air chamber 14 is released. Under the elastic action of the second spring 16, the piston block 15 drives the push rod 17 to retract into the mold, so as to make way for the installation of the sand core 40 later.

[0024] As a further embodiment of the present invention, it also includes: L-shaped support frame 19 is fixedly connected to the top of base 1, and a second drive platform 20 is fixedly connected to the bottom of L-shaped support frame 19. The adsorption seat 21 is slidably connected to the bottom end of the second drive platform. The top of both the moving mold 5 and the stationary mold 6 are provided with relief grooves 7 that are adapted to the adsorption seat 21. Several suction nozzles 23 are arranged in an array on the adsorption seat 21 to adsorb the sand core 40 when the moving mold 5 and the stationary mold 6 are separated. Specifically, by setting the suction nozzle 23, during the separation process of the moving mold 5 and the stationary mold 6, the suction nozzle 23 adsorbs the sand core 40 (at this time, the sand core 40 is in the position of being pushed by the push rod 17). Then, the second drive platform 20 (e.g., by means of a motor and a lead screw) drives the adsorption seat 21 to move, so as to move the sand core 40 away from the mold and into the working place of the sand core 40 for cleaning the surface of the casting.

[0025] As a further embodiment of the present invention, it also includes: Several storage slots 2101 are provided on the suction base 21, corresponding to the positions of the suction nozzles 23. The gas shell 22 is slidably connected inside the adsorption seat 21. The gas shell 22 is fixedly connected to several suction nozzles 23. There are two piston plates 24 symmetrically and slidably connected at both ends inside the gas shell 22. The pushing mechanism drives the air shell 22 to move downward during the separation of the moving mold 5 and the stationary mold 6, so that the suction nozzle 23 contacts the sand core 40. Then, it drives the two piston plates 24 to move, so that the suction nozzle 23 generates negative pressure and adsorbs the sand core 40. The bottom end of the suction nozzle 23 is fixedly connected to the suction cup 2301. Specifically, by setting up a pushing mechanism, during the mold closing process, the suction nozzle 23 and suction cup 2301 are located in the receiving groove 2101, away from the surface of the sand core 40, to avoid the sand core 40 being too hot and causing the suction cup 2301 to be directly damaged. After the casting has cooled and formed, the pushing mechanism causes the suction nozzle 23 to move downward and contact the surface of the sand core 40. Then, the pushing mechanism continues to move the two piston plates 24, generating negative pressure in the air shell 22, which in turn generates negative pressure in the suction nozzle 23 to adsorb the sand core 40. Then, the second driving platform 20 drives the adsorption seat 21 to move to move the sand core 40 away from the mold and into the working area for cleaning the surface of the casting. Then, the pushing mechanism resets the piston plate 24 and suction nozzle 23, puts down the sand core 40, and then drives the second driving platform 20 to move and reset, waiting for the next mold closing.

[0026] As a further embodiment of the present invention, the pushing mechanism includes two connecting frames 25. One end of each connecting frame 25 passes through both ends of the gas shell 22 and is fixedly connected to two piston plates 24 respectively. The other end of the connecting frame 25 is symmetrically provided with first inclined grooves 2501 on both sides. Two U-shaped drive frames 26 are symmetrically and slidably connected to the side wall of the adsorption seat 21. The two ends of the U-shaped drive frames 26 are slidably connected to the first inclined groove 2501. A fourth spring 27 is fixedly connected between the two ends of the U-shaped drive frames 26 and the side wall of the first inclined groove 2501. The push component drives the two U-shaped drive frames 26 to move downwards during the separation of the moving mold 5 and the stationary mold 6; The pushing component includes two sliding seats 28, which are symmetrically slidably connected to the U-shaped drive frame 26. A fifth spring 29 is fixedly connected between the sliding seats 28 and the U-shaped drive frame 26. Second inclined grooves 2801 are symmetrically opened on both sides of the sliding seats 28, and a first guide inclined surface is opened at the top of the sliding seats 28. Drive pin 2802 is slidably connected in the second inclined groove 2801 and fixedly connected to the side wall of adsorption seat 21. L-shaped fixing brackets 30 are fixedly connected to the top of the moving mold 5 and the stationary mold 6 at the position corresponding to the sliding seat 28. A pushing block 31 is slidably connected to the top of the L-shaped fixing bracket 30. A first pushing slope adapted to the guide slope is opened at the bottom of the pushing block 31. A sixth spring 32 is fixedly connected between the pushing block 31 and the L-shaped fixing bracket 30. The locking mechanism limits the movement of the U-shaped drive frame 26 when it moves to the bottom. Specifically, during the mold closing process, the L-shaped fixing frame 30 drives the push block 31 to move. During the movement, the bottom end of the push block 31 contacts the top end of the sliding seat 28. Under the action of the first guide slope and the first push slope, the push block 31 moves upward. The sixth spring 32 generates elastic force. After the push block 31 passes through the sliding seat 28, under the action of the sixth spring 32, the push block 31 returns to its original position downward. During the process of demolding after the casting has cooled, the L-shaped fixing frame 30 drives the pushing block 31 to move, which in turn pushes the sliding seat 28 to move. The second spring 16 generates elastic force. During the movement of the sliding seat 28, the driving pin 2802 and the second inclined groove 2801 move relative to each other. Driven by the second inclined groove 2801, the sliding seat 28 pushes the U-shaped driving frame 26 to move downward. Supported by the fourth spring 27, the air shell 22 drives the suction nozzle 23 to move downward synchronously until the suction nozzle 23 contacts the surface of the sand core 40. At this point, the air shell 22 can no longer move downward, while the U-shaped driving frame 26 continues to move downward. At this time, the U-shaped driving frame 26 and the connecting frame 25 move relative to each other. The end of the U-shaped driving frame 26 slides along the first inclined groove 2501. The fourth spring 27 generates elastic force. Driven by the first inclined groove 2501, the connecting frame 25 drives the piston plate 24 to move, so that the air shell 22 generates negative pressure, and the suction nozzle 23 sucks up the sand core 40. After the U-shaped drive frame 26 moves down to the bottom, the U-shaped drive frame 26 is limited by the locking mechanism to maintain the suction force of the nozzle 23 and prevent the sand core 40 from falling off during the transportation of the sand core 40.

[0027] As a further embodiment of the present invention, the snap-fit ​​mechanism includes: The snap-fit ​​seat 33 is disposed on the adsorption seat 21. The snap-fit ​​seat 33 has a snap-fit ​​groove 34 on its side wall and a second guide slope is provided above the snap-fit ​​seat 33 located above the snap-fit ​​groove 34. The snap-fit ​​block 38 is slidably connected to the U-shaped drive frame 26. An eighth spring 39 is fixedly connected between the snap-fit ​​block 38 and the U-shaped drive frame 26. A second pushing slope is provided at the bottom end of the snap-fit ​​block 38. The snap-fit ​​seat 33 is slidably connected to the adsorption seat 21. A seventh spring 35 is fixedly connected between the snap-fit ​​seat 33 and the adsorption seat 21. A magnet 36 is fixedly connected to the side wall of the snap-fit ​​seat 33. An induction electromagnet 37 is fixedly connected to the side wall of the adsorption seat 21. Specifically, by setting up a snap-fit ​​mechanism, during the process of the U-shaped drive frame 26 moving to the bottom, the snap-fit ​​block 38 contacts the snap-fit ​​seat 33. Through the second guide slope and the second pushing slope, the snap-fit ​​seat 33 retracts until the snap-fit ​​block 38 moves to the snap-fit ​​groove 34. Under the action of the eighth spring 39, the snap-fit ​​block 38 snaps into the snap-fit ​​groove 34, thereby completing the limiting of the U-shaped drive frame 26. After the suction nozzle 23 transports the sand core 40 to the final position, the circuit of the induction electromagnet 37 is turned off, causing the induction electromagnet 37 to lose its magnetic force. Under the action of the seventh spring 35, the snap-fit ​​seat 33 moves away from the side wall of the adsorption seat 21, and the snap-fit ​​block 38 disengages from the snap-fit ​​groove 34. According to the above principle, the suction nozzle 23 cancels the adsorption of the sand core 40 and moves upward. After the sand core 40 is transported, the adsorption seat 21 moves to the mold closing position and restarts the circuit of the induction electromagnet 37, so that the induction electromagnet 37 generates a magnetic force different from that of the magnet 36, so as to adsorb the movement of the snap-fit ​​seat 33 in preparation for the next snap-fit.

[0028] The working principle of this invention is as follows: First, the required sand cores 40 are installed in predetermined positions in the moving mold 5 and the stationary mold 6 respectively. Then, the first drive platform 2 drives the two sliding frames 3 to move closer to each other, causing the moving mold 5 and the stationary mold 6 to close synchronously. After the ends of the moving mold 5 and the stationary mold 6 contact each other, the first drive platform 2 continues to drive the two sliding frames 3 to move one distance, compressing the first spring 4, so that the sealing plate 801 fixedly connected to the end of the moving mold 5 is tightly fitted with the end face of the stationary mold 6, ensuring the overall sealing after the mold is closed. During the process of continuing to compress the first spring 4, the second rack 13, which is fixedly connected to the sliding frame 3, moves towards the side wall of the moving mold 5 along with the sliding frame 3, driving the gear 12 to rotate. The gear 12 then drives the first rack 11 and the compression seat 10 to move, causing the air pressure in the compression chamber 9 to decrease. Since the compression chamber 9 is connected to the open cavity 8 through the air hole, the open cavity 8 generates negative pressure synchronously. When the molten metal is injected into the mold through the casting pipe at the stationary mold 6, the gas generated during the filling process is continuously drawn into the open cavity 8 under the action of negative pressure and discharged through the air hole, so that the molten metal can fully contact and densely fill the surface of the sand core 40, which helps to avoid defects such as air holes and voids on the surface or inside of the casting and improves the quality of the casting. After the molten metal cools and solidifies, the first drive platform 2 drives the two sliding frames 3 to move away from each other in the opposite direction. The second rack 13 moves away from the side wall of the moving mold 5 along with the sliding frame 3. Through the gear 12, it drives the first rack 11 and the compression seat 10 to move in the opposite direction, so that positive pressure is generated in the compression chamber 9. Since the gas generated during the filling of the open cavity 8 is greater than the initial value due to the accumulation of gas during the filling of the molten metal, the positive pressure gas is blown through the air hole to the contact surface between the sand core 40 and the inner wall of the cavity, effectively reducing the adhesion caused by high temperature sintering, and creating conditions for the smooth demolding of the sand core 40 in the future. While positive pressure is generated in compression chamber 9, some air pressure inside open chamber 8 enters air chamber 14 through air inlet check valve 1401, increasing the pressure inside air chamber 14. The air pressure pushes piston block 15 to compress second spring 16 to store energy, and at the same time, the rod of piston block 15 pushes third spring 18 to generate compression force. As the first drive platform 2 continues to drive the two sliding frames 3 away from each other, and the moving mold 5 and the stationary mold 6 begin to separate, the first spring 4 releases its elasticity completely, and the moving mold 5 and the stationary mold 6 separate. At this time, the third spring 18 in the air cavity 14 releases its elasticity, and the push rod 17 extends under the action of the spring force, smoothly pushing the sand core 40 out of the open cavity 8. The extended state of the push rod 17 is used to briefly position the sand core 40, keeping the sand core 40 in a suspended state, so that the subsequent adsorption seat 21 can accurately grasp it.

[0029] The foregoing has shown and described 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 embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A casting mold for easy demolding of castings, characterized in that, include: The base (1) has a first driving platform (2) fixedly connected to its top end, and two sliding frames (3) are symmetrically slidably connected to the top end of the first driving platform (2). The moving mold (5) and the stationary mold (6) are slidably connected to the sliding frame (3) at the corresponding positions. A first spring (4) is fixedly connected between the moving mold (5) and the stationary mold (6) and the sliding frame (3). An open cavity (8) is opened in both the moving mold (5) and the stationary mold (6). An air groove (802) is arrayed on the side of the open cavity (8) near the sand core (40). A compression chamber (9) is opened inside the moving mold (5). The compression chamber (9) is connected to the air passage of the open cavity (8). A compression seat (10) is sealed and slidably connected inside the compression chamber (9). A first rack (11) is fixedly connected to the end of the compression seat (10). A gear (12) meshes with the top surface of the first rack (11). The gear (12) is rotatably connected to the outer wall of the moving mold (5). A second rack (13) meshes with the top of the gear (12). The second rack (13) is fixedly connected to the sliding frame (3). Both the moving mold (5) and the stationary mold (6) are equipped with ejection mechanisms. The ejection mechanisms are used to eject the sand core (40) and position it during the separation of the moving mold (5) and the stationary mold (6) so as to demold the sand core (40).

2. The casting mold for easy demolding of castings according to claim 1, characterized in that, The ejection mechanism includes several air chambers (14), which are symmetrically opened in the moving mold (5) and the stationary mold (6). The air chambers (14) are connected to the air passage of the open cavity (8). An air inlet check valve (1401) is provided at the air passage connection between the air chambers (14) and the open cavity (8). A pressure relief valve (1402) is provided at the end of the air chambers (14). Piston block (15), the piston block (15) is slidably connected in the air chamber (14), and a second spring (16) is fixedly connected between the piston block (15) and the air chamber (14). A push rod (17) is slidably sleeved on the rod of the piston block (15). A third spring (18) is fixedly connected between the push rod (17) and the rod of the piston block (15). The end of the push rod (17) is in contact with the sand core (40).

3. A casting mold for easy demolding of castings according to claim 1, characterized in that, It also includes an L-shaped support frame (19), which is fixedly connected to the top of the base (1), and a second drive platform (20) is fixedly connected to the bottom of the L-shaped support frame (19). Adsorption seat (21), the adsorption seat (21) is slidably connected to the bottom end of the second drive platform (20), and the top of the moving mold (5) and the stationary mold (6) are provided with relief grooves (7) that are adapted to the adsorption seat (21). Several suction nozzles (23) are arranged in an array on the adsorption seat (21) for adsorbing the sand core (40) when the moving mold (5) and the stationary mold (6) are separated.

4. A casting mold for easy demolding of castings according to claim 3, characterized in that, It also includes several storage slots (2101), and the several storage slots (2101) are opened on the suction base (21) at the positions corresponding to the suction nozzles (23); The gas shell (22) is slidably connected to the adsorption seat (21). The gas shell (22) is fixedly connected to several of the suction nozzles (23). Two piston plates (24) are symmetrically sealed and slidably connected at both ends inside the gas shell (22). The pushing mechanism drives the air shell (22) to move downward during the separation of the moving mold (5) and the stationary mold (6), so that the suction nozzle (23) contacts the sand core (40), and then drives the two piston plates (24) to move, so that the suction nozzle (23) generates negative pressure and adsorbs the sand core (40).

5. A casting mold for easy demolding of castings according to claim 4, characterized in that, The pushing mechanism includes two connecting frames (25). One end of each connecting frame (25) passes through both ends of the gas shell (22) and is fixedly connected to two piston plates (24). The other end of each connecting frame (25) is provided with a first inclined groove (2501) symmetrically on both sides. Two U-shaped drive frames (26) are symmetrically slidably connected to the side wall of the adsorption seat (21). The two ends of the U-shaped drive frames (26) are slidably connected to the first inclined groove (2501). A fourth spring (27) is fixedly connected between the two ends of the U-shaped drive frames (26) and the side wall of the first inclined groove (2501). The pushing component drives two U-shaped drive frames (26) to move downwards during the separation of the moving mold (5) and the stationary mold (6).

6. A casting mold for easy demolding of castings according to claim 5, characterized in that, The actuating component includes: Two sliding seats (28) are symmetrically slidably connected to a U-shaped drive frame (26). A fifth spring (29) is fixedly connected between the sliding seats (28) and the U-shaped drive frame (26). A second inclined groove (2801) is symmetrically opened on both sides of the sliding seats (28). A first guide inclined surface is opened at the top of the sliding seats (28). A drive pin (2802) is slidably connected in the second inclined groove (2801) and fixedly connected to the side wall of the adsorption seat (21); The top of the moving mold (5) and the stationary mold (6) are both fixedly connected to the sliding seat (28) with an L-shaped fixing frame (30). The top of the L-shaped fixing frame (30) is slidably connected to a push block (31). The bottom of the push block (31) is provided with a first push slope that is adapted to the guide slope. A sixth spring (32) is fixedly connected between the push block (31) and the L-shaped fixing frame (30). The locking mechanism limits the movement of the U-shaped drive frame (26) when the U-shaped drive frame (26) moves to the bottom.

7. A casting mold for easy demolding of castings according to claim 6, characterized in that, The snap-fit ​​mechanism includes a snap-fit ​​seat (33), which is disposed on the adsorption seat (21). The snap-fit ​​seat (33) has a snap-fit ​​groove (34) on its side wall, and a second guide slope is provided above the snap-fit ​​seat (33) located above the snap-fit ​​groove (34). A snap-fit ​​block (38) is slidably connected to a U-shaped drive frame (26). An eighth spring (39) is fixedly connected between the snap-fit ​​block (38) and the U-shaped drive frame (26). A second pushing slope is provided at the bottom of the snap-fit ​​block (38).

8. A casting mold for easy demolding of castings according to claim 7, characterized in that, The snap-fit ​​seat (33) is slidably connected to the adsorption seat (21). A seventh spring (35) is fixedly connected between the snap-fit ​​seat (33) and the adsorption seat (21). A magnet (36) is fixedly connected to the side wall of the snap-fit ​​seat (33). An induction electromagnet (37) is fixedly connected to the side wall of the adsorption seat (21).

9. A casting mold for easy demolding of castings according to claim 3, characterized in that, The bottom end of the suction nozzle (23) is fixedly connected to a suction cup (2301).

10. A casting mold for easy demolding of castings according to claim 1, characterized in that, The end of the moving mold (5) is fixedly connected to a sealing plate (801) that is compatible with the open cavity (8).

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