Instantaneous negative pressure automatic suction casting device and method

Abstract

The invention relates to an instantaneous negative pressure automatic suction casting device and method.The instantaneous negative pressure automatic suction casting device comprises a mold assembly, a smelting assembly, a suction casting vacuum pump set and a first suction casting valve, one end of the first suction casting valve communicates with the outlet end of the suction casting vacuum pump set, and the mold assembly is of a structure with an upper opening and a lower opening; the smelting assembly is located over the mold assembly, and the smelting assembly is of a lower opening structure and communicates with an upper opening of the mold assembly. The other end of the first suction casting valve is communicated with a negative pressure chamber, the negative pressure chamber is communicated with a suction casting valve set, the suction casting valve set comprises a second suction casting valve with one end communicated with the negative pressure chamber and a hose with one end communicated with the second suction casting valve, and the other end of the hose is communicated with a lower opening of the mold assembly. By the adoption of the technical scheme, the technical problem that an existing negative pressure suction casting mode cannot provide large negative pressure within a short time, the flowing mold filling efficiency of high-temperature melt can be remarkably reduced, and therefore the quality of a negative pressure suction casting piece is reduced can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of negative pressure suction casting, and particularly to an instantaneous negative pressure automatic suction casting device and method. Background Art

[0002] At present, the combination of vacuum suspension melting technology and negative pressure suction casting technology has achieved a new casting method. Vacuum suspension melting is to melt metal in a vacuum or an inert gas-filled environment after evacuating, so that the molten metal reaches a predetermined pouring temperature. During the melting process, the metal is melted by the heating of the surrounding induction coils; negative pressure suction casting is to increase the power of the secondary coil after the vacuum suspension melting reaches a predetermined condition to melt the cold shell at the bottom of the crucible and open the flow guide tube channel. At this time, the suction casting pump is started to apply pressure to the high-temperature melt, and the high-temperature melt flows through the flow guide tube at the bottom of the crucible to the mold under a negative pressure environment (i.e., an environment lower than the atmospheric pressure).

[0003] For the above-mentioned suction casting method combining vacuum suspension melting technology and negative pressure suction casting technology, the method of generating negative pressure vacuum in negative pressure suction casting all adopts the method of combining a suction casting pump and a suction casting valve. The suction casting pump is started in advance during suction casting. When it is detected that the metal liquid flows downward, the suction casting valve is opened to perform suction casting on the metal liquid. However, limited by the pumping speed of the suction casting pump, the suction casting pump cannot provide a large negative pressure in a short time, and the small suction casting negative pressure will also significantly reduce the flow filling efficiency of the high-temperature melt, thereby reducing the quality of the negative pressure suction casting parts. Summary of the Invention

[0004] In view of the technical problem that the existing negative pressure suction casting method cannot provide a large negative pressure in a short time, which will significantly reduce the flow filling efficiency of the high-temperature melt and thus reduce the quality of the negative pressure suction casting parts, the present invention provides an instantaneous negative pressure automatic suction casting device and method.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: The present invention provides an instantaneous negative pressure automatic suction casting device, including a mold assembly, a melting assembly, a suction casting vacuum pump group, and a first suction casting valve with one end connected to the outlet end of the suction casting vacuum pump group. The mold assembly has an upper and lower open structure. The melting assembly is located directly above the mold assembly, and the melting assembly has a lower open structure and is connected to the upper open of the mold assembly; the other end of the first suction casting valve is connected to a negative pressure chamber, the negative pressure chamber is connected to a suction casting valve group, the suction casting valve group includes a second suction casting valve with one end connected to the negative pressure chamber and a hose with one end connected to the second suction casting valve, and the other end of the hose is connected to the lower open of the mold assembly. The inner cavity volume of the negative pressure chamber is more than 20 times the sum of the inner cavity volumes of the mold assembly and the suction casting valve group.

[0006] The beneficial effects of the present invention are as follows: due to the vacuum in the negative pressure chamber, a large negative pressure is instantly generated on the molten metal flow, so that the molten metal quickly enters the mold assembly to fill the mold, reducing the time for the molten metal to flow downward from the smelting assembly into the mold assembly, reducing the loss of molten metal temperature, avoiding the negative pressure lag problem caused by insufficient suction casting pump pumping speed in traditional processes, and significantly improving the filling efficiency and casting quality.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the smelting assembly includes a fixedly mounted crucible base, a crucible fixedly mounted on the upper side of the crucible base, a primary coil wound around the outside of the crucible, a flow guide tube vertically mounted on the crucible base, and a secondary coil located inside the crucible base and wound around the flow guide tube, the upper end of the flow guide tube being connected to the inner side of the crucible, and the lower end extending downward from the crucible base and connected to the upper opening of the mold assembly.

[0009] The beneficial effect of adopting the above further scheme is: during operation, the raw materials are added to the crucible of the smelting component, the power supplies of the primary coil and the secondary coil are turned on, and the power supply power is increased according to the process requirements. After the raw materials are melted and meet the insulation requirements, the primary coil heats the alloy in the crucible to melt the alloy. During the melting process, the suspension force at the bottom of the crucible is not enough to completely separate the molten metal from the crucible, and a layer of cold shell will be formed. When the smelting time is reached, the power supply power of the secondary coil is increased to melt the bottom cold shell, the guide tube is turned on, and the molten metal begins to be poured downward through the guide tube. At this time, the No. 2 suction casting valve of the suction casting valve group is opened. Due to the vacuum in the negative pressure chamber, a large negative pressure will be instantly generated on the molten metal flow, so that the liquid flow quickly enters the mold assembly for filling.

[0010] Furthermore, the smelting assembly also includes a transmission plate fixedly installed on the lower side of the crucible base, the transmission plate has a vertical through opening to form a leakage hole, and one end has a horizontal opening to form a transmission hole connected to the leakage hole, the lower side of the leakage hole is connected to the upper opening of the mold assembly, and the lower end of the guide tube extends downward into the leakage hole; the instantaneous negative pressure automatic suction casting device also includes a fixedly installed ultrasonic sensor, the transmitting end of the ultrasonic sensor is opposite to the transmission hole, and the ultrasonic sensor is communicatively connected to the No. 2 suction casting valve.

[0011] The beneficial effect of adopting the above further scheme is: the ultrasonic sensor is used to detect the moment when the high-temperature melt flows through the guide tube, which is not affected by the heating and luminescence of the guide tube. The detection accuracy of the ultrasonic sensor can improve the filling efficiency and casting quality.

[0012] Furthermore, the ultrasonic sensor is provided with a sealing cover plate, and the ultrasonic sensor is installed in the closed sealing cover plate.

[0013] The beneficial effects of adopting the above further scheme are as follows: By forming a sealed installation of the ultrasonic sensor through the sealing cover plate, air leakage from the transmission holes during suction casting can be avoided.

[0014] Furthermore, the mold assembly includes a position adjustment structure and a mold structure mounted on the position adjustment structure. The mold structure includes a suction casting disc mounted on the position adjustment structure and a mold body fixedly mounted on the suction casting disc. One end of the suction casting disc is open to form a side hole communicating with the other end of the hose, and the upper side is open to form a round hole communicating with the side hole. The mold body has an upper and lower open structure, and a plurality of suction casting holes are formed on the lower side. The upper side communicates with the lower opening of the melting assembly, and each of the suction casting holes is within the range of the round hole and communicates with the round hole at the same time. The inner cavity volume of the negative pressure chamber is more than 20 times the sum of the inner cavity volumes of the suction casting disc, the mold body, and the suction casting valve group.

[0015] The beneficial effects of adopting the above further scheme are as follows: During operation, the gas in the mold body enters the negative pressure chamber through the suction casting holes, the round hole, and the side hole to form a negative pressure. The molten metal under negative pressure quickly enters the mold body of the mold assembly for suction casting molding, reducing the time for flowing from the melting assembly downward into the mold assembly, reducing the loss of the temperature of the molten metal, and avoiding the problem of negative pressure lag caused by insufficient pumping speed of the suction casting pump in the traditional process.

[0016] Furthermore, the position adjustment structure includes a lifting driving member and a transverse driving member mounted on the driving end of the lifting driving member. The driving end of the lifting driving member moves vertically, and the driving end of the transverse driving member moves horizontally. The horizontal movement path is located directly below the mold structure, and the mold structure is mounted on the driving end of the transverse driving member.

[0017] The beneficial effects of adopting the above further scheme are as follows: The installation of the suction casting disc of the mold structure can be achieved through the lifting driving member and the transverse driving member, and the position of the mold body of the mold structure can be quickly adjusted, greatly improving the convenience of operation.

[0018] Furthermore, at least two mold structures are provided and are arranged at intervals on the position adjustment structure at the same time; at least two suction casting valve groups are provided, and each second suction casting valve communicates with the negative pressure chamber, and the ends of each hose communicate with each mold structure one by one.

[0019] The beneficial effects of adopting the above further scheme are as follows: During one suction casting action stroke, the positions of the respective mold structures can be adjusted through the position adjustment structure so that different mold structures communicate with the lower opening of the melting assembly. In this way, after opening the corresponding second suction casting valve, the filling operation of the mold body of different mold structures can be realized, improving the operation efficiency.

[0020] Furthermore, the mold assembly further includes a height - adapting flange. The height - adapting flange has a vertically - through structure, with its upper end fixedly installed and connected to the lower opening of the melting assembly, and its lower end abutted against the upper side of the corresponding mold body and connected to the upper opening of the corresponding mold body. The height of the height - adapting flange is greater than the maximum difference in the heights of the mold structures.

[0021] The beneficial effect of adopting the above - mentioned further solution is that through the adjustment of the position - adjusting structure, the corresponding mold structure abuts against the lower end of the height - adapting flange and is connected to the lower opening of the melting assembly. The height - adapting flange is used to compensate for the height difference between multiple mold bodies, so as to avoid the situation that when the mold with a lower height is raised to be tightly abutted against the height - adapting flange, the mold with a higher height is prematurely tightly abutted against the height - adapting flange, resulting in interference.

[0022] Furthermore, it further includes a melting furnace. A placement plate is horizontally arranged in the melting furnace. The placement plate divides the inner cavity of the melting furnace into a forming cavity and a melting cavity. A through - opening is formed in the middle of the placement plate to form an avoidance opening connecting the forming cavity and the melting cavity. The mold assembly is fixedly installed in the forming cavity and connected to the lower opening of the avoidance opening. The melting assembly is fixedly installed in the melting cavity and connected to the upper opening of the avoidance opening. The flexible hose extends into the forming cavity and is connected to the mold assembly.

[0023] The beneficial effect of adopting the above - mentioned further solution is that by providing a melting furnace to form a closed melting chamber, temperature loss can be reduced and safety can be improved. Moreover, the upper cavity of the furnace body is the melting cavity, and the lower cavity of the furnace body is the forming cavity. The integrated furnace body shortens the distance between the mold assembly and the melting assembly, can reduce the time for the melt to reach the mold assembly, reduce temperature loss, and improve the filling efficiency and casting quality.

[0024] The present invention also provides a suction - casting method applied to an instantaneous negative - pressure automatic suction - casting device, including the following steps: Open the first suction - casting valve, and evacuate the negative - pressure chamber through the suction - casting vacuum pump group; Add raw materials to the melting assembly, and heat and melt the raw materials through the melting assembly; When the molten metal starts to pour downward, open the second suction - casting valve so that the molten metal quickly fills the mold assembly; After reaching the cooling - time requirement, take out the mold assembly to complete the entire melting and suction - casting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the instantaneous negative - pressure automatic suction - casting device of the present invention; Figure 2 For the present invention Figure 1 Partial enlarged view; Figure 3 The enlarged view of part A in Figure 2 the present invention; Figure 4 The enlarged view of part B in Figure 2 the present invention; Figure 5 The partial structure diagram of the instantaneous negative pressure automatic suction casting device of the present invention; Figure 6 The flow chart of the suction casting method applied to the instantaneous negative pressure automatic suction casting device of the present invention.

[0026] In the attached drawings, the list of components represented by each reference numeral is as follows: 1. Mold assembly; 11. Position adjustment structure; 111. Lifting driving part; 112. Transverse driving part; 12. Mold structure; 121. Suction casting disc; 1211. Side hole; 1212. Round hole; 122. Mold body; 1221. Suction casting hole; 13. Height adaptation flange; 2. Melting assembly; 21. Crucible base; 22. Crucible; 23. Primary coil; 24. Diversion pipe; 25. Secondary coil; 26. Transmission plate; 261. Leak hole; 262. Transmission hole; 3. Suction casting vacuum pump group; 31. No. 1 suction casting valve; 4. Negative pressure chamber; 41. Vacuum gauge; 5. Suction casting valve group; 51. No. 2 suction casting valve; 52. Hose; 6. Ultrasonic sensor; 61. Sealing cover plate; 7. Melting furnace; 71. Forming cavity; 72. Melting cavity; 73. Feeding bin; 74. Material pipe; 8. Placing plate; 81. Avoidance opening. Detailed implementation manners

[0027] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0028] Example 1 As Figure 1 and Figure 2, the present invention provides an instantaneous negative pressure automatic suction casting device, which includes a mold assembly 1, a melting assembly 2, a suction casting vacuum pump group 3, and a first suction casting valve 31 connected to the outlet end of the suction casting vacuum pump group 3 at one end. The mold assembly 1 has an upper and lower open structure. The melting assembly 2 is located directly above the mold assembly 1, and the melting assembly 2 has a lower open structure and is connected to the upper open of the mold assembly 1. The other end of the first suction casting valve 31 is connected to a negative pressure chamber 4. The negative pressure chamber 4 is connected to a suction casting valve group 5. The suction casting valve group 5 includes a second suction casting valve 51 connected to the negative pressure chamber 4 at one end and a hose 52 connected to the second suction casting valve 51 at one end. The other end of the hose 52 is connected to the lower open of the mold assembly 1. The inner cavity volume of the negative pressure chamber 4 is more than 20 times the sum of the inner cavity volumes of the mold assembly 1 and the suction casting valve group 5.

[0029] The beneficial effect of this embodiment is that during operation, first close the second suction casting valve 51 of the suction casting valve group 5, open the first suction casting valve 31, and use the suction casting vacuum pump group 3 to evacuate the negative pressure chamber 4 in advance. Then add the raw materials into the melting assembly 2, and melt the raw materials through the melting assembly 2. When the molten metal starts to pour downward, open the second suction casting valve 51 of the suction casting valve group 5. Due to the vacuum in the negative pressure chamber 4, a large negative pressure will be instantly generated on the molten metal flow, causing the liquid flow to quickly enter the mold assembly 1 for filling. This reduces the time for the molten metal to flow from the melting assembly 2 downward into the mold assembly 1, reduces the loss of the molten metal temperature, avoids the problem of negative pressure lag caused by insufficient pumping speed of the suction casting pump in the traditional process, significantly improves the filling efficiency and the quality of the casting. Compared with the progressive pumping pressure of the traditional suction casting pump, the evacuated negative pressure chamber 4 can achieve instantaneous negative pressure, and different negative pressure values can be used for suction casting according to the mold type, the filling ability of the material flow, etc., to achieve controllable negative pressure suction casting.

[0030] On the basis of the above embodiment, the negative pressure chamber 4 is connected to a vacuum gauge 41 to accurately measure the vacuum degree in the negative pressure chamber 4 through the vacuum gauge 41.

[0031] Among them, the inner cavity volume of the negative pressure chamber 4 is more than 20 times the sum of the inner cavity volumes of the mold assembly 1 and the suction casting valve group 5, that is, the inner cavity volume of the negative pressure chamber 4 is more than 20 times the sum of the inner cavity volumes of the mold assembly 1, the second suction casting valve 51, and the hose 52. After evacuating the negative pressure chamber 4 in advance by the suction casting vacuum pump group 3 and opening the second suction casting valve 51 of the suction casting valve group 5, a large negative pressure will be instantly generated on the molten metal flow, causing the liquid flow to quickly enter the mold assembly 1 for filling.

[0032] Embodiment 2 As Figures 2 - 4On the basis of Example 1, the smelting assembly 2 includes a fixedly installed crucible base 21, a crucible 22 fixedly installed on the upper side of the crucible base 21, a primary coil 23 wound around the outside of the crucible 22, a flow guide tube 24 vertically installed on the crucible base 21, and a secondary coil 25 located in the crucible base 21 and wound around the flow guide tube 24, the upper end of the flow guide tube 24 is connected to the inner side of the crucible 22, and the lower end extends downward from the crucible base 21 and is connected to the upper opening of the mold assembly 1.

[0033] The beneficial effect of adopting the preferred scheme in the above embodiment is that during operation, the raw material is added to the crucible 22 of the smelting component 2, the power of the primary coil 23 and the secondary coil 25 are turned on, and the power supply is increased according to the process requirements. After the raw material is melted and meets the insulation requirements, the primary coil 23 heats the alloy in the crucible 22 to melt the alloy. During the melting process, the suspension force at the bottom of the crucible 22 is insufficient to completely separate the molten metal from the crucible 22, and a layer of cold shell will be formed. When the smelting time is reached, the power supply of the secondary coil 25 is increased to melt the bottom cold shell, the guide tube 24 is turned on, and the molten metal begins to be poured downward through the guide tube 24. At this time, the No. 2 suction casting valve 51 of the suction casting valve group 5 is opened. Due to the vacuum in the negative pressure chamber 4, a large negative pressure will be instantly generated on the molten metal flow, so that the liquid flow quickly enters the mold assembly 1 for filling.

[0034] The crucible base 21 has a through opening and a stepped hole, and the lower opening is larger than the upper opening. The secondary coil 25 is installed in the large opening of the crucible base 21. The flow guide tube 24 is in a "T" shape, and the small diameter end is inserted from the small opening of the crucible base 21 and extends downward from the crucible base 21. The large diameter end of the flow guide tube 24 is hung on the crucible base 21.

[0035] Example 3 like Figures 2 - 4 On the basis of Examples 1 and 2, the smelting assembly 2 further includes a transmission plate 26 fixedly mounted on the lower side of the crucible base 21, the transmission plate 26 vertically penetrates through an opening to form a leak hole 261, and one end is horizontally opened to form a transmission hole 262 connected to the leak hole 261, the lower side of the leak hole 261 is connected to the upper opening of the mold assembly 1, and the lower end of the guide tube 24 extends downward into the leak hole 261; the instantaneous negative pressure automatic suction casting device further includes a fixedly mounted ultrasonic sensor 6, the transmitting end of the ultrasonic sensor 6 is directly opposite to the transmission hole 262, and the ultrasonic sensor 6 is communicatively connected to the No. 2 suction casting valve 51.

[0036] The beneficial effects of adopting the preferred solutions in the above embodiments are as follows. During operation, when the ultrasonic sensor 6 emits ultrasonic waves when the melt does not flow downward, the ultrasonic waves pass through the transmission hole 262 and propagate to the inner wall of the opposite leakage hole 261 and then reflect back to the ultrasonic sensor 6. When the melt flows downward, the ultrasonic waves will be reflected back to the ultrasonic sensor 6 when encountering the melt. There are obvious differences in time and distance between the two situations. The signal is transmitted to the second suction casting valve 51, and the second suction casting valve 51 is opened to apply a downward negative pressure suction to the high-temperature melt to complete the flow filling, ensuring the flow filling efficiency of the melt. By detecting the moment when the high-temperature melt flows down through the diversion pipe 24 with the ultrasonic sensor 6, without being affected by the heating and glowing of the diversion pipe 24, the detection accuracy of the ultrasonic sensor 6 can improve the filling efficiency and the quality of the casting.

[0037] Embodiment 4 As Figures 2 - 4 , on the basis of Embodiments 1-3, the ultrasonic sensor 6 is provided with a sealing cover plate 61, and the ultrasonic sensor 6 is installed in the closed sealing cover plate 61.

[0038] The beneficial effects of adopting the preferred solutions in the above embodiments are that the sealing installation of the ultrasonic sensor 6 is formed through the sealing cover plate 61 to avoid air leakage from the transmission hole 262 during suction casting.

[0039] Embodiment 5 As Figures 2 - 4 , on the basis of Embodiments 1-4, the mold assembly 1 includes a position adjustment structure 11 and a mold structure 12 installed on the position adjustment structure 11. The mold structure 12 includes a suction casting disc 121 installed on the position adjustment structure 11 and a mold body 122 fixedly installed on the suction casting disc 121. One end of the suction casting disc 121 is open to form a side hole 1211 communicating with the other end of the connecting hose 52, and the upper side is open to form a round hole 1212 communicating with the side hole 1211. The mold body 122 has an upper and lower open structure, and a plurality of suction casting holes 1221 are formed on the lower side. The upper side communicates with the lower opening of the melting assembly 2, and each suction casting hole 1221 is within the range of the round hole 1212 and communicates with the round hole 1212 at the same time. The inner cavity volume of the negative pressure chamber 4 is more than 20 times the sum of the inner cavity volumes of the suction casting disc 121, the mold body 122, and the suction casting valve group 5.

[0040] The beneficial effects of adopting the preferred solutions in the above embodiments are as follows. During operation, the gas in the mold body 122 enters the negative pressure chamber 4 through the suction casting holes 1221, the round hole 1212, and the side hole 1211 to form a negative pressure. The melted metal liquid quickly enters the mold body 122 of the mold assembly 1 under the negative pressure for suction casting molding, reducing the time for flowing from the melting assembly 2 downward into the mold assembly 1, reducing the loss of the temperature of the metal liquid, and avoiding the negative pressure lag problem caused by insufficient pumping speed of the suction casting pump in the traditional process.

[0041] Moreover, each suction casting hole 1221 is located within the range of the round hole 1212, enabling each mold body 122 to be directly installed on the suction casting disc 121 without any additional adjustment, and ensuring the connection between each suction casting hole 1221 and the corresponding round hole 1212.

[0042] Embodiment 6 As Figure 2 and Figure 5 , on the basis of Embodiments 1-5, the position adjustment structure 11 includes a lifting driving member 111 and a lateral driving member 112 installed at the driving end of the lifting driving member 111. The driving end of the lifting driving member 111 moves vertically, and the driving end of the lateral driving member 112 moves horizontally. Moreover, the horizontal movement path is located directly below the mold structure 12, and the mold structure 12 is installed at the driving end of the lateral driving member 112.

[0043] The beneficial effect of adopting the preferred solution in the above embodiment is that the installation of the suction casting disc 121 of the mold structure 12 can be realized through the lifting driving member 111 and the lateral driving member 112, and the position of the mold body 122 of the mold structure 12 can be quickly adjusted, greatly improving the convenience of operation.

[0044] As a specific solution of the above embodiment, both the lifting driving member 111 and the lateral driving member 112 can be linear driving mechanisms such as ball screw drive mechanisms, synchronous belt drives, electric push rods, electric cylinders, cam mechanisms, cylinder mechanisms, and linear motor drives. The driving end of the lifting driving member 111 is drivingly connected to the lateral driving member 112, and the driving end of the lateral driving member 112 is drivingly connected to the suction casting disc 121.

[0045] In the figure, both the lifting driving member 111 and the lateral driving member 112 are shown as ball screw drive mechanisms. Specifically, both the lifting driving member 111 and the lateral driving member 112 include a base, a lead screw rotatably connected to the base, a motor with its output end coaxially and fixedly connected to the lead screw, and a sliding seat slidably connected to the base. The motor is fixedly installed on the base, and the sliding seat is threadedly connected to the corresponding lead screw. That is, for the lifting driving member 111, its base and lead screw are both vertically arranged; for the lateral driving member 112, its base and lead screw are both horizontally arranged. The base of the lateral driving member 112 is fixedly connected to the sliding seat of the lifting driving member 111, and the suction casting disc 121 is fixedly installed on the sliding seat of the lateral driving member 112.

[0046] Embodiment 7 As Figure 2 and Figure 5 , on the basis of Embodiments 1-6, at least two mold structures 12 are provided and are arranged at intervals on the position adjustment structure 11 at the same time; at least two suction casting valve groups are provided, and each second suction casting valve 51 is communicated with the negative pressure chamber 4, and the ends of each hose 52 are communicated with each mold structure 12 one by one.

[0047] The beneficial effect of adopting the preferred solution in the above embodiment is that during one suction casting operation stroke, the positions of the respective die structures 12 are adjusted by the position adjusting structure 11, so that different die structures 12 communicate with the lower opening of the melting assembly 2. In this way, after the corresponding second suction casting valve 51 is opened, the filling operation of the die body 122 of different die structures 12 can be realized, improving the operation efficiency.

[0048] As a specific solution of the above embodiment, the suction casting discs 121 of the respective die structures 12 are fixedly connected to the sliding seats of the lateral driving members 112.

[0049] Among them, the die structures 12 can be provided with two, three, four, five, etc. Figure 5 Three are shown in [Figure], and the three die bodies 122 can be bar die, liner die, wrench die, etc., to form the filling operation for products of different shapes.

[0050] Embodiment 8 As Figure 2 and Figure 4 , on the basis of Embodiments 1-7, the die assembly 1 further includes a height adaptation flange 13. The height adaptation flange 13 has a vertically penetrating structure, and the upper end is fixedly installed and communicates with the lower opening of the melting assembly 2, and the lower end abuts against the upper side of the corresponding die body 122 and communicates with the upper opening of the corresponding die body 122. The height of the height adaptation flange 13 is greater than the maximum difference in the heights of the respective die structures 12.

[0051] The beneficial effect of adopting the preferred solution in the above embodiment is that through the adjustment of the position adjusting structure 11, the corresponding die structure 12 abuts against the lower end of the height adaptation flange 13 and communicates with the lower opening of the melting assembly 2. The height adaptation flange 13 is used to compensate for the height difference between the multiple die bodies 122, so as to avoid that when the die with a lower height is raised to be tightly abutted against the height adaptation flange 13, the die with a higher height is tightly abutted against the height adaptation flange 13 in advance, resulting in interference.

[0052] On the basis of the above embodiment, the inner cavity volume of the negative pressure chamber 4 is more than 20 times the sum of the inner cavity volumes of the suction casting disc 121, the die body 122, the height adaptation flange 13, and the suction casting valve group 5.

[0053] Embodiment 9 As Figure 1 and Figure 2, on the basis of Embodiments 1-8, an instantaneous negative pressure automatic suction casting device according to the present invention further includes a melting furnace 7. A placement plate 8 is horizontally arranged in the melting furnace 7. The placement plate 8 divides the inner cavity of the melting furnace 7 into a forming cavity 71 and a melting cavity 72. An avoidance opening 81 communicating the forming cavity 71 and the melting cavity 72 is formed through the middle of the placement plate 8. The mold assembly 1 is fixedly installed in the forming cavity 71 and communicates with the lower opening of the avoidance opening 81. The melting assembly 2 is fixedly installed in the melting cavity 72 and communicates with the upper opening of the avoidance opening 81. The flexible hose 52 extends into the forming cavity 71 and communicates with the mold assembly 1.

[0054] The beneficial effect of adopting the preferred solution in the above embodiment is that by providing the melting furnace 7 to form a closed melting chamber, the temperature loss can be reduced, and the safety can be improved. Moreover, the upper cavity of the furnace body is the melting cavity 72, and the lower cavity of the furnace body is the forming cavity 71. The integrated furnace body shortens the distance between the mold assembly 1 and the melting assembly 2, can reduce the time for the melt to reach the mold assembly 1, reduce the temperature loss, and improve the filling efficiency and the quality of the casting.

[0055] On the basis of the above embodiment, the upper end of the highly adaptable flange 13 is fixedly connected to the lower side of the placement plate 8 and communicates with the lower opening of the avoidance opening 81. Moreover, the transmission plate 26 and the sealing cover plate 61 are both fixedly connected to the upper side of the placement plate 8. The sealing cover plate 61 and the placement plate 8 jointly form a sealed installation for the ultrasonic sensor 6.

[0056] On the basis of the above embodiment, a feeding bin 73 is installed on the top of the melting furnace 7. A material pipe 74 is connected to the bottom of the feeding bin 73. The lower end of the material pipe 74 extends downward into the melting cavity 72 of the melting furnace 7 and extends towards the crucible 22, so as to store raw materials through the feeding bin 73 and add raw materials into the crucible 22 through the material pipe 74.

[0057] Moreover, a partition is provided in the feeding bin 73 to partition and form different chambers that are all connected to the material pipe 74 to store different raw materials.

[0058] Embodiment 10 As Figure 6 , the present invention also provides a suction casting method applied to an instantaneous negative pressure automatic suction casting device, including the following steps: Open the first suction casting valve 31, and evacuate the negative pressure chamber 4 through the suction casting vacuum pump group 3; Add raw materials to the melting assembly 2, and heat and melt the raw materials through the melting assembly 2; When the molten metal starts to pour downward, open the second suction casting valve 51 so that the molten metal can quickly complete filling in the mold assembly 1; After meeting the cooling time requirement, take out the mold assembly 1 to complete the entire melting and suction casting.

[0059] Taking the case where two mold bodies 122 are provided as an example, the detailed operation method of the present invention is described as follows: Step 1: First, different raw materials (such as bar raw materials and wrench raw materials) are added into different chambers of the feeding bin 73 for preparation. The corresponding mold body 122 (such as the bar raw material mold) is installed on the corresponding suction casting plate 121, and the other mold body 122 (such as the wrench raw material mold) is installed on the corresponding other suction casting plate 121. The lifting drive 111 and the horizontal drive 112 align the mold body 122 (such as aligning the bar raw material mold first) with the central axis of the height adaptation flange 13, and press upwards.

[0060] Step 2: Open the No. 1 suction casting valve 31, evacuate the negative pressure chamber 4 through the suction casting vacuum pump group 3, and determine through the vacuum gauge 41 whether the process requirement is reached. At the same time, evacuate the melting cavity 72 and the molding cavity 71 (vacuuming can be performed by other vacuuming equipment) to the process requirement value and then fill it with argon.

[0061] Step 3: When loading, the alloy raw materials (such as rod raw materials) in the charging bin 73 can be placed in the crucible 22; turn on the power of the primary coil 23 and the secondary coil 25, increase the power according to the process requirements, and after the raw materials are melted and meet the insulation requirements, increase the power of the secondary coil 25 and turn on the guide tube 24.

[0062] Step 4: The molten metal starts to pour downwards, the ultrasonic sensor 6 detects the molten metal, and the second suction valve 51 opens automatically. Under the action of negative pressure, the molten metal completes the filling of the mold body 122 (such as the rod raw material mold).

[0063] Step 5: Align the other mold body 122 (such as aligning the wrench raw material mold) with the central axis of the height-matching flange 13 by adjusting the lifting drive member 111 and the horizontal drive member 112, and tighten it upward.

[0064] Step 6: Open the No. 1 suction casting valve 31, evacuate the negative pressure chamber 4 through the suction casting vacuum pump group 3, and determine whether the process requirement is reached through the vacuum gauge 41. At the same time, evacuate the melting cavity 72 and the molding cavity 71 (vacuuming can be performed by other vacuuming equipment) to the process requirement value and then fill it with argon.

[0065] Step 7: When loading, the alloy raw materials (such as wrench raw materials) in the charging bin 73 can be placed in the crucible 22; turn on the power of the primary coil 23 and the secondary coil 25, increase the power according to the process requirements, and after the raw materials are melted and meet the insulation requirements, increase the power of the secondary coil 25 and turn on the guide tube 24.

[0066] Eighth step: The molten metal starts to be poured downward. The ultrasonic sensor 6 detects the molten metal, and the second suction casting valve 51 automatically opens. Under the action of negative pressure, the molten metal completes the filling in the mold body 122 (such as the wrench raw material mold).

[0067] Ninth step: After reaching the required cooling time, open the furnace door by deflation, adjust the position through the lifting driving part 111 and the lateral driving part 112, so that the two mold bodies 122 descend, take out the two mold bodies 122, and complete the whole melting and suction casting.

[0068] By adopting the instantaneous negative pressure automatic suction casting device of the present invention, flexible switching of multiple molds is realized, and the suction casting forming of multiple molds can be completed at one time. The integrated melting furnace 7 is adopted to shorten the distance from the crucible 22 to the mold body 122. The ultrasonic sensor 6 is adopted to realize the precise detection of the molten metal flow. The negative pressure chamber 4 in the negative pressure state realizes instantaneous negative pressure and controllable negative pressure suction casting. It not only improves the production efficiency, reduces the production cost, but also significantly improves the success rate of casting forming and the overall forming quality effect.

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0070] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In the present invention, unless otherwise clearly defined and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Further, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0073] In the description of this specification, the description of reference terms such as "an embodiment", "some embodiments", "exemplifications", "specific exemplifications", or "some exemplifications", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or exemplification are included in at least one embodiment or exemplification of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or exemplification. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or exemplifications in a suitable manner. In addition, without conflict, those skilled in the art may combine and combine the different embodiments or exemplifications described in this specification and the features of different embodiments or exemplifications.

[0074] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An instantaneous negative pressure automatic suction casting device, characterized in that: The invention comprises a mold assembly (1), a smelting assembly (2), a suction casting vacuum pump group (3), and a first suction casting valve (31) whose one end is connected to the outlet end of the suction casting vacuum pump group (3); the mold assembly (1) is in an upper and lower opening structure; the smelting assembly (2) is located directly above the mold assembly (1); the smelting assembly (2) is in a lower opening structure and is connected to the upper opening of the mold assembly (1); the other end of the first suction casting valve (31) is connected to a negative pressure chamber (4); the negative pressure chamber (4) is connected to a suction casting valve group (5); the suction casting valve group (5) comprises a second suction casting valve (51) whose one end is connected to the negative pressure chamber (4) and a hose (52) whose one end is connected to the second suction casting valve (51); the other end of the hose (52) is connected to the lower opening of the mold assembly (1); the inner cavity volume of the negative pressure chamber (4) is greater than 20 times the sum of the inner cavity volumes of the mold assembly (1) and the suction casting valve group (5).

2. According to claim 1, an instantaneous negative pressure automatic suction casting device is characterized in that: The smelting assembly (2) comprises a fixedly mounted crucible base (21), a crucible (22) fixedly mounted on the upper side of the crucible base (21), a primary coil (23) wound around the outside of the crucible (22), a flow guide tube (24) vertically mounted on the crucible base (21), and a secondary coil (25) located inside the crucible base (21) and wound around the flow guide tube (24), wherein the upper end of the flow guide tube (24) is connected to the inner side of the crucible (22), and the lower end extends downwardly out of the crucible base (21) and is connected to the upper opening of the mold assembly (1).

3. According to claim 2, an instantaneous negative pressure automatic suction casting device is characterized in that: The smelting assembly (2) further comprises a transmission plate (26) fixedly mounted on the lower side of the crucible base (21); the transmission plate (26) is vertically penetrated to form a leakage hole (261), and one end is horizontally opened to form a transmission hole (262) connected to the leakage hole (261); the lower side of the leakage hole (261) is connected to the upper opening of the mold assembly (1), and the lower end of the guide tube (24) extends downward into the leakage hole (261); the instantaneous negative pressure automatic suction casting device further comprises a fixedly mounted ultrasonic sensor (6), the transmitting end of the ultrasonic sensor (6) is directly opposite to the transmission hole (262), and the ultrasonic sensor (6) is communicatively connected to the second suction casting valve (51).

4. According to claim 3, an instantaneous negative pressure automatic suction casting device is characterized in that: The ultrasonic sensor (6) is provided with a sealing cover plate (61), and the ultrasonic sensor (6) is installed in the closed sealing cover plate (61).

5. According to claim 1, the instantaneous negative pressure automatic suction casting device is characterized in that: The mold assembly (1) comprises a position adjustment structure (11) and a mold structure (12) mounted on the position adjustment structure (11); the mold structure (12) comprises a suction casting plate (121) mounted on the position adjustment structure (11) and a mold body (122) fixedly mounted on the suction casting plate (121); one end of the suction casting plate (121) is opened to form a side hole (1211) connected to the other end of the hose (52); and the upper side opening is opened to form a side hole (1211) connected to the side hole (1211). ), the mold body (122) is of an upper and lower opening structure, and a plurality of suction casting holes (1221) are formed on the lower side, and the upper side is connected to the lower opening of the smelting component (2), and each of the suction casting holes (1221) is located within the range of the circular hole (1212) and is connected to the circular hole (1212) at the same time, and the inner cavity volume of the negative pressure chamber (4) is greater than 20 times the sum of the inner cavity volumes of the suction casting plate (121), the mold body (122) and the suction casting valve group (5).

6. The instantaneous negative pressure automatic suction casting device according to claim 5, characterized in that: The position adjustment structure (11) comprises a lifting drive member (111) and a transverse drive member (112) mounted on the driving end of the lifting drive member (111); the driving end of the lifting drive member (111) moves vertically, and the driving end of the transverse drive member (112) moves transversely, and the transverse movement path is located directly below the mold structure (12); the mold structure (12) is mounted on the driving end of the transverse drive member (112).

7. The instantaneous negative pressure automatic suction casting device according to claim 5, characterized in that: At least two of the mold structures (12) are provided and are arranged at intervals on the position adjustment structure (11); at least two of the suction casting valve groups are provided, each of the No. 2 suction casting valves (51) is connected to the negative pressure chamber (4), and the ends of each of the hoses (52) are connected to each of the mold structures (12) one by one.

8. The instantaneous negative pressure automatic suction casting device according to claim 7, characterized in that: The mold assembly (1) further comprises a height-adapting flange (13), the height-adapting flange (13) being a through-structure from top to bottom, with the upper end being fixedly mounted and connected to the lower opening of the smelting assembly (2), the lower end being abutted against the upper side of the corresponding mold body (122) and connected to the upper opening of the corresponding mold body (122), the height of the height-adapting flange (13) being greater than the maximum difference in height between the mold structures (12).

9. An instantaneous negative pressure automatic suction casting device according to any one of claims 1 to 8, characterized in that: The invention also comprises a smelting furnace (7), wherein a storage plate (8) is transversely arranged in the smelting furnace (7), wherein the storage plate (8) divides the inner cavity of the smelting furnace (7) into a molding cavity (71) and a smelting cavity (72), wherein a through opening in the middle of the storage plate (8) forms an escape opening (81) connecting the molding cavity (71) and the smelting cavity (72), wherein the mold assembly (1) is fixedly installed in the molding cavity (71) and is connected to the lower opening of the escape opening (81), wherein the smelting assembly (2) is fixedly installed in the smelting cavity (72) and is connected to the upper opening of the escape opening (81), and the hose (52) extends into the molding cavity (71) and is connected to the mold assembly (1).

10. A suction casting method applied to the instantaneous negative pressure automatic suction casting device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Open the first suction casting valve (31), and evacuate the negative pressure chamber (4) through the suction casting vacuum pump group (3); Adding raw materials to the smelting component (2), and heating and smelting the raw materials through the smelting component (2); When the molten metal begins to pour downward, the second suction valve (51) is opened to allow the molten metal to quickly fill the mold assembly (1); After the cooling time requirement is reached, the mold assembly (1) is removed to complete the entire smelting suction casting.

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