Precision casting equipment for ultra-high chromium casting balls and precision casting process using the equipment

Abstract

The present invention relates to the technical field of high-chromium cast ball manufacturing, and discloses a precision casting process for ultra-high-chromium cast balls, wherein a precision casting device for ultra-high-chromium cast balls includes a base and a first casting box on the base, the bases have two, the upper surfaces of the two bases are respectively mounted with a first casting box and a second casting box, and the upper overall structures of the two bases are consistent, the first casting box and the second casting box are symmetrically installed, and the first casting box includes a first mold box, a first inner box and a first half cavity. The present invention adopts a symmetrical clamping structure, and the first mold box is fitted with the second mold box to form a mold cavity, and then the metal liquid is introduced into the mold cavity by a silicon carbide pouring pipe. After the casting is formed, the second mold box and the first mold box are separated from each other for demoulding, and if adhesion occurs, it can be ejected through a silicon carbide sealing plate for demoulding, so that the device has the function of convenient demoulding and the function of heat treatment of the casting.

Description

Technical Field

[0001] The invention relates to the technical field of high-chromium cast ball manufacturing, in particular to a precision casting process for ultra-high-chromium cast balls. Background Art

[0002] High chromium alloy casting balls (high chromium white cast iron grinding balls, high chromium steel balls), referred to as high chromium balls. Most domestic wear-resistant material companies are based on medium-frequency electric furnaces, which are used to melt reasonably matched high-quality scrap steel and chromium alloy materials; micro-alloy and temper the molten iron; and then use unique metal mold and sand mold casting and molding processes; and then obtain a martensitic matrix after high-temperature quenching + tempering treatment to achieve higher hardness and wear resistance.

[0003] However, the existing high chromium alloy casting equipment usually adopts sand casting, but this method is not convenient for material removal, the demoulding operation is relatively troublesome, and it does not have the function of heat treatment of castings; therefore, it does not meet the existing needs. In this regard, we propose a precision casting process for ultra-high chromium casting balls. Summary of the invention

[0004] The present invention provides a precision casting process for ultra-high chromium cast balls, which has the beneficial effects of convenient demoulding and rapid cooling, and solves the problem that the high chromium alloy cast ball equipment mentioned in the above background technology is usually manufactured by sand casting, but this method is not convenient for material removal, the demoulding operation is relatively troublesome, and it does not have the function of heat treatment of the casting.

[0005] The present invention provides the following technical solutions: a precision casting process for ultra-high chromium cast balls, wherein a precision casting device for ultra-high chromium cast balls comprises a base and a first casting box on the base, the bases are two, the upper surfaces of the two bases are respectively mounted with a first casting box and a second casting box, and the upper overall structures of the two bases are consistent, and the first casting box and the second casting box are symmetrically mounted;

[0006] The first casting box comprises a first mold box, a first inner box and a first half cavity, the first mold box is slidably mounted on the upper surface of the base, the first mold box is arranged inside the first inner box, and the first half cavity is arranged inside the first inner box;

[0007] The second casting mold box comprises a second mold box, a second inner box and a second half cavity, the upper surface of the base is also slidably mounted with a second mold box, the interior of the second mold box is arranged with a second inner box, and the interior of the second inner box is provided with a first half cavity;

[0008] One end of the first inner box and the second inner box are used for fitting connection, and the first half cavity and the second half cavity are combined to form a cavity, and the cavity is a mold cavity.

[0009] As an optional solution of the precision casting equipment of the ultra-high chromium cast ball of the present invention, wherein: the first casting mold box also includes a first semicircular groove and a first limiting groove, the top of the first half cavity is provided with a first semicircular groove located at the upper end of the first inner box, and the first semicircular groove is provided above the first limiting groove located on the upper surface of the first mold box;

[0010] The second casting box further comprises a second semicircular groove and a second limiting groove, the second semicircular groove is disposed at the top of the second half cavity, and a second limiting groove is disposed above the second semicircular groove and located on the upper surface of the second casting box;

[0011] The second mold box is fitted with the first mold box, the second inner box is fitted with the first inner box, the first semicircular groove and the second limiting groove are combined to form a hole groove, a liquid guide frame is installed in the hole groove, the liquid guide frame includes a silicon carbide pouring tube, a plug-in foot, an upper end connecting seat and a pouring tray, the two first semicircular grooves cooperate with the second semicircular grooves to form an annular groove, and the annular groove is used to fix the silicon carbide pouring tube inside, the bottom end of the silicon carbide pouring tube is provided with a plug-in foot, the plug-in foot is used to embed into the annular groove formed by the second semicircular groove and the first semicircular groove, the top end of the silicon carbide pouring tube is provided with an upper end connecting seat, a pouring tray is installed above the silicon carbide pouring tube, and the silicon carbide pouring tube is used to be plugged into the lower surface of the pouring tray.

[0012] As an optional solution for the precision casting equipment of the ultra-high chromium cast ball described in the present invention, one end of the two first inner boxes at the outermost edge of the first mold box is installed with an outer hydraulic component, and the outer hydraulic component includes an outer cylinder and an inner rod shaft, and the inner rod shaft is movably installed inside the outer cylinder, and one end of the inner rod shaft is used to be fixed to one end of the first inner box.

[0013] As an optional solution of the precision casting equipment of the ultra-high chromium cast ball of the present invention, wherein: the outer hydraulic component further includes a first pressure chamber, a first piston and a first external pipe, the outer side of the inner rod shaft is provided with a first pressure chamber located in the outer cylinder, the outer surface of the outer cylinder is provided with a first piston, and one end of the outer cylinder is fixedly installed with a first external pipe;

[0014] The first piston and the first pressure chamber are used to provide a driving force for the inner rod shaft.

[0015] As an optional solution for the precision casting equipment of the ultra-high chromium cast ball described in the present invention, one end of the inner rod shaft is also equipped with an inner hydraulic component, and the inner hydraulic component includes a movable inner shaft, a second pressure chamber and a second piston. The movable inner shaft is slidably installed inside the inner rod shaft, a second pressure chamber is provided at one end of the inner rod shaft, and a second piston is fixedly installed on the outer surface of the movable inner shaft.

[0016] As an optional solution for the precision casting equipment of the ultra-high chromium cast ball described in the present invention, the inner hydraulic component also includes a second external tube and a silicon carbide sealing plate, the upper surface of one end of the inner rod shaft is provided with a second external tube, and one end of the movable inner shaft is provided with a silicon carbide sealing plate, the silicon carbide sealing plate is used to be embedded in the inner wall of the first half cavity, and the curvature of one end of the silicon carbide sealing plate is consistent with the inner wall of the first half cavity, the silicon carbide sealing plate is used to be sealed and embedded in the first half cavity, and each of the first external tube and the second external tube is supported by two central tubes.

[0017] As an optional scheme for the precision casting equipment of the ultra-high chromium cast ball described in the present invention, wherein: the outer side of the inner rod shaft is symmetrically provided with a liquid guide port, the liquid guide port includes a main liquid inlet pipe, an auxiliary liquid inlet pipe and a buffer inner cavity, the upper surface of the inner rod shaft is provided with a main liquid inlet pipe, the lower surface of the inner rod shaft is provided with an auxiliary liquid inlet pipe, and the interior of the inner rod shaft is provided with a buffer inner cavity.

[0018] As an optional solution for the precision casting equipment of the ultra-high chromium cast ball described in the present invention, wherein: a push frame is also installed on the upper end of the base, and the push frame includes a rear push seat, a hydraulic cylinder, a horizontal push plate, a slide rail and a slide seat, and a rear push seat is installed on the upper end of the base, and hydraulic cylinders are fixedly installed at both ends of the rear push seat, and a horizontal push plate is fixedly installed at one end of the hydraulic cylinder, and a support column is symmetrically installed at one end of the horizontal push plate, and the support column is used to realize the fixed state of the horizontal push plate and the first mold box, and one end of the outer hydraulic component is used for fixed installation with the horizontal push plate;

[0019] The upper surface of the base is symmetrically equipped with slide rails, and the lower surfaces of the transverse push plate and the first mold box are both equipped with slide seats, which are used to slide the first mold box and the transverse push plate on the upper surface of the slide rails.

[0020] As an optional solution of the precision casting equipment of the ultra-high chromium cast ball of the present invention, wherein: two driving pumps are fixedly installed on one side of the base, and a hose is fixedly installed on the upper surface of each driving pump, one of the driving pumps is fixedly connected to the main liquid inlet pipe through the hose, and the other driving pump is fixedly connected to the auxiliary liquid inlet pipe through another hose;

[0021] A second cold row is fixedly mounted on one end of the base, a first cold row is mounted on the upper end of the second cold row, a connecting pipe is mounted on the other end of the driving pump, one end of the first cold row is connected to one of the driving pumps, one end of the second cold row is connected to another driving pump, the other end of the first cold row is connected to another main liquid inlet pipe, and the other end of the second cold row is connected to another auxiliary liquid inlet pipe;

[0022] A high-temperature heating tube is fixedly installed inside the first half chamber and the second half chamber, and the inner wall of the high-temperature heating tube is coated with a ceramic isolation layer;

[0023] The first casting box and the second casting box are both provided with square grooves inside, and a guide groove is provided between every two of the square grooves.

[0024] The present invention also provides a precision casting process for ultra-high chromium casting balls.

[0025] S1. First, the ends of the first mold box and the second mold box are fitted together to make the internal mold cavity sealed. Then, the silicon carbide pouring tube is inserted into the first semicircular groove, and the pouring plate is placed on the top of the silicon carbide pouring tube. At this time, the metal liquid is poured into the mold cavity through the silicon carbide pouring tube and the pouring plate. When the casting is formed and naturally cooled, the inner rod shaft is slowly retracted to make the first inner box and the second inner box out of the sealed state, and the first mold box and the second mold box are separated to make the molded casting fall down. At this time, an external oil pump device is connected, and a top-opening action is applied through the movable inner shaft to make the casting out of the sticky state of the second half cavity and the first semicircular groove;

[0026] S2. After the casting is formed and cooled naturally, it is necessary to perform heat treatment on the casting. The first mold box and the second mold box are pushed together by a hydraulic cylinder so that the second inner box fits the first inner box and the casting is buckled inside. At this time, it is heated by a high-temperature heating tube, and the outer side of the high-temperature heating tube is filled with silicon carbide to conduct the gap between the high-temperature heating tube and the ceramic isolation layer, and the casting is slowly heated to 500 to 800 degrees. The heat preservation time is generally two to three hours, so that the cast iron reaches a uniform temperature;

[0027] S3. Through the driving effect of the driving pump, the quenching oil is transferred to the inside of the main liquid inlet pipe through the hose. Half of the quenching medium is selected from oil, water or solution, which can be selected according to the usage. It is then sent into the buffer inner cavity by the main liquid inlet pipe. At this time, the internal space of the buffer inner cavity is filled. Before this, the first mold box and the second mold box are in a state of mutual adhesion, and the second mold box and the first mold box form a sealed cavity. At this time, the inner rod shaft retracts, so that the first inner box and the second inner box are completely retracted into the first mold box and the second mold box, so that the previous first inner box and the second inner box are out of the sealed state and are separated by a certain distance, so that the casting is in an unconstrained state and a corresponding distance is left. At this time, the movable inner shaft extends forward, driving the silicon carbide sealing plate to extend together, so that the silicon carbide sealing plate and the inner wall of the ceramic isolation layer are out of the sealed state, so that the quenching oil enters the mold cavity formed by the first half cavity and the second half cavity.

[0028] The present invention has the following beneficial effects:

[0029] 1. The precision casting equipment of the ultra-high chromium casting ball adopts a symmetrical clamping structure. The first mold box and the second mold box are fitted together to form a mold cavity, and then the metal liquid is introduced into the mold cavity by the silicon carbide pouring pipe. After the casting is formed, the second mold box and the first mold box can be separated from each other for demoulding. If adhesion occurs, it can be ejected through the silicon carbide sealing plate for demoulding, so that the device has the function of convenient demoulding and heat treatment of castings;

[0030] At the same time, the device uses the main liquid inlet pipe and the silicon carbide sealing plate to deliver the coolant into the cavity from one side of the device, so that the heat inside the device will show a gradual cooling trend, so as to avoid the heat cooling too fast and affect the quenching quality. The flow rate of the oil can be adjusted by manually controlling the drive pump. The oil feed speed can be adjusted at any time according to the usage. The coolant after heat exchange will enter the first cold row through the connecting pipe, and then be cooled by the first cold row, and finally flow into the main liquid inlet pipe again, realizing the circulation cooling operation mode and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 It is a schematic diagram of a push frame of the present invention.

[0033] Figure 3 It is a schematic diagram of the structure of the first casting box and the second casting box of the present invention.

[0034] Figure 4 This is a schematic diagram of the internal structure of the outer hydraulic component of the present invention.

[0035] Figure 5 This is a schematic diagram of the internal structure of the inner layer hydraulic component of the present invention.

[0036] In the figure: 1, base; 2, first mold box; 21, first mold box; 22, first inner box; 23, first half cavity; 24, first semicircular groove; 25, first limit groove; 3, second mold box; 31, second mold box; 32, second inner box; 33, second half cavity; 34, second semicircular groove; 35, second limit groove; 4, liquid guide frame; 41, silicon carbide pouring pipe; 42, plug-in foot; 43, upper end connecting seat; 44, pouring plate; 5, outer hydraulic component; 51, outer cylinder; 52, inner rod shaft; 53, first pressure chamber; 54, first piston; 55, first External pipe; 6. Inner hydraulic component; 61. Movable inner shaft; 62. Second pressure chamber; 63. Second piston; 64. Second external pipe; 65. Silicon carbide sealing plate; 7. Liquid guide port; 71. Main liquid inlet pipe; 72. Secondary liquid inlet pipe; 73. Buffer inner chamber; 8. Push rack; 81. Rear push seat; 82. Hydraulic cylinder; 83. Horizontal push plate; 84. Slide rail; 85. Slide seat; 91. Hose; 92. Drive pump; 93. Connecting pipe; 94. First radiator; 95. Second radiator; 11. High-temperature heating pipe; 12. Ceramic isolation layer; 13. Concentrator; 14. Guide groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] See also Figure 1-5 , and discloses a precision casting device for ultra-high chromium cast balls, comprising a base 1 and a first casting box 2 on the base 1, the base 1 having two, the upper surfaces of the two bases 1 are respectively mounted with the first casting box 2 and the second casting box 3, and the upper overall structures of the two bases 1 are consistent, the first casting box 2 and the second casting box 3 are symmetrically mounted;

[0040] The first casting box 2 comprises a first mold box 21, a first inner box 22 and a first half cavity 23. The first mold box 21 is slidably mounted on the upper surface of the base 1. The first mold box 21 is arranged inside with the first inner box 22. The first inner box 22 is provided inside with the first half cavity 23.

[0041] The second casting box 3 comprises a second mold box 31, a second inner box 32 and a second half cavity 33. The second mold box 31 is also slidably mounted on the upper surface of the base 1. The second mold box 31 is arranged inside the second inner box 32. The second inner box 32 is provided inside with a first half cavity 23.

[0042] One end of the first inner box 22 and the second inner box 32 are used for fitting connection, and the first half cavity 23 and the second half cavity 33 are combined to form a cavity, which is a mold cavity;

[0043] The first casting box 2 further comprises a first semicircular groove 24 and a first limiting groove 25. The top of the first half cavity 23 is provided with a first semicircular groove 24 located at the upper end of the first inner box 22. The first semicircular groove 24 is provided above the first limiting groove 25 located on the upper surface of the first casting box 21.

[0044] The second casting box 3 further comprises a second semicircular groove 34 and a second limiting groove 35. The second semicircular groove 34 is disposed at the top of the second half cavity 33, and the second limiting groove 35 is disposed above the second semicircular groove 34 and located on the upper surface of the second casting box 31.

[0045] The second mold box 31 is fitted with the first mold box 21, the second inner box 32 is fitted with the first inner box 22, the first semicircular groove 24 and the second limiting groove 35 are combined to form a hole groove, a liquid guide frame 4 is installed in the hole groove, the liquid guide frame 4 includes a silicon carbide pouring pipe 41, a plug-in foot 42, an upper end connecting seat 43 and a pouring plate 44, the two first semicircular grooves 24 and the second semicircular grooves 34 are matched to form an annular groove, and the annular groove is used to fix the silicon carbide pouring pipe 41 therein, and the bottom end of the silicon carbide pouring pipe 41 is provided with a plug-in foot 42;

[0046] The plug-in foot 42 is used to be embedded in the annular groove formed by the second semicircular groove 34 and the first semicircular groove 24. The top of the silicon carbide pouring tube 41 is provided with an upper end connecting seat 43. A pouring tray 44 is installed above the silicon carbide pouring tube 41. The silicon carbide pouring tube 41 is used to be plugged into the lower surface of the pouring tray 44.

[0047] An outer hydraulic component 5 is installed at one end of the two first inner boxes 22 at the outermost edge of the first mold box 21. The outer hydraulic component 5 includes an outer cylinder 51 and an inner rod shaft 52. The inner rod shaft 52 is movably installed inside the outer cylinder 51. One end of the inner rod shaft 52 is used to be fixed to one end of the first inner box 22.

[0048] The outer hydraulic component 5 further includes a first pressure chamber 53, a first piston 54 and a first external pipe 55. The outer side of the inner rod shaft 52 is provided with a first pressure chamber 53 located in the outer cylinder 51. The outer surface of the outer cylinder 51 is provided with a first piston 54. One end of the outer cylinder 51 is fixedly mounted with the first external pipe 55.

[0049] The first piston 54 and the first pressure chamber 53 are used to provide a driving force for the inner rod shaft 52;

[0050] An inner hydraulic component 6 is also installed at one end of the inner rod shaft 52, and the inner hydraulic component 6 includes a movable inner shaft 61, a second pressure chamber 62 and a second piston 63. The movable inner shaft 61 is slidably installed inside the inner rod shaft 52, and a second pressure chamber 62 is provided at one end of the inner rod shaft 52. A second piston 63 is fixedly installed on the outer surface of the movable inner shaft 61;

[0051] The inner hydraulic component 6 also includes a second external tube 64 and a silicon carbide sealing plate 65. The upper surface of one end of the inner rod shaft 52 is provided with a second external tube 64, and one end of the movable inner shaft 61 is provided with a silicon carbide sealing plate 65. The silicon carbide sealing plate 65 is used to be embedded in the inner wall of the first half cavity 23, and the curvature of one end of the silicon carbide sealing plate 65 is consistent with the inner wall of the first half cavity 23. The silicon carbide sealing plate 65 is used to be sealed and embedded in the first half cavity 23. Each of the first external tube 55 and the second external tube 64 is supported by two central tubes 13.

[0052] First, the hydraulic cylinder 82 drives the horizontal push plate 83 to support the first casting box 2 and the second casting box 3 to gather in the same direction, so that the end faces of the first casting box 21 and the second casting box 31 fit each other, and the two are matched inside to form a cavity. At this time, the silicon carbide pouring tube 41 is inserted into the annular groove formed by the combination of the first semicircular groove 24 and the second semicircular groove 34 in sequence, and the pouring plate 44 is placed on the upper end of the silicon carbide pouring tube 41. At this time, the molten metal liquid is slowly poured into the inside of the pouring plate 44. At this time, the metal liquid leaks into the inside of the cavity through the silicon carbide pouring tube 41 to form a corresponding shape. When the metal liquid is filled, the pouring plate 44 is removed, and after cooling, the casting is formed;

[0053] The hydraulic cylinder 82 is used to slowly drive the first mold box 2 and the second mold box 3 to move away from each other, so that the first mold box 21 and the second mold box 31 are separated, and the molded casting falls down, but at the same time, the casting will stick to the second half cavity 33 or the first half cavity 23. At this time, it is only necessary to retract the first inner box 22 or the second inner box 32 into the first mold box 21 or the second mold box 31. At this time, it is connected through an external oil pump device to provide pressure to the second external pipe 64, and the pressure is transmitted to the second pressure chamber 62. After the internal pressure of the second pressure chamber 62 increases, pressure is applied to the second piston 63, and the second piston 63 is pushed outward, driving the silicon carbide sealing plate 65 to be pushed out, and the casting stuck in the first half cavity 23 or the second half cavity 33 is removed, and an opening action is applied to make the casting break away from the sticky state between the second half cavity 33 and the first semicircular groove 24, making it more convenient to demold the casting;

[0054] The outer hydraulic component 5 cooperates with the inner hydraulic component 6 to ensure that the positions of the first inner box 22 and the silicon carbide sealing plate 65 are changed. The operator can control the external oil pump to determine the extension distance of the inner rod shaft 52 and the movable inner shaft 61 to achieve demolding of the casting and subsequent cooling operations.

[0055] Example 2

[0056] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 1-5 The outer side of the inner rod shaft 52 is symmetrically provided with a liquid guide port 7, and the liquid guide port 7 includes a main liquid inlet pipe 71, an auxiliary liquid inlet pipe 72 and a buffer inner cavity 73. The upper surface of the inner rod shaft 52 is provided with a main liquid inlet pipe 71, the lower surface of the inner rod shaft 52 is provided with an auxiliary liquid inlet pipe 72, and the interior of the inner rod shaft 52 is provided with a buffer inner cavity 73.

[0057] Example 3

[0058] This embodiment is an improvement made on the basis of embodiment 2. For details, please refer to Figure 1-5 A push frame 8 is also installed at the upper end of the base 1, and the push frame 8 includes a rear push seat 81, a hydraulic cylinder 82, a horizontal push plate 83, a slide rail 84 and a slide seat 85. A rear push seat 81 is installed at the upper end of the base 1, and hydraulic cylinders 82 are fixedly installed at both ends of the rear push seat 81. A horizontal push plate 83 is fixedly installed at one end of the hydraulic cylinder 82, and a support column is symmetrically installed at one end of the horizontal push plate 83. The support column is used to achieve a fixed state between the horizontal push plate 83 and the first mold box 21, and one end of the outer hydraulic component 5 is used for fixed installation with the horizontal push plate 83;

[0059] The upper surface of the base 1 is symmetrically mounted with slide rails 84, and the lower surfaces of the horizontal push plate 83 and the first mold box 21 are both mounted with slide seats 85, and the slide seats 85 are used to slide the first mold box 21 and the horizontal push plate 83 on the upper surface of the slide rails 84;

[0060] Two driving pumps 92 are fixedly installed on one side of the base 1, and a hose 91 is fixedly installed on the upper surface of each driving pump 92, one of the driving pumps 92 is fixedly connected to the main liquid inlet pipe 71 through the hose 91, and the other driving pump 92 is fixedly connected to the auxiliary liquid inlet pipe 72 through another hose 91;

[0061] A second cooling row 95 is fixedly mounted on one end of the base 1, a first cooling row 94 is mounted on the upper end of the second cooling row 95, a connecting pipe 93 is mounted on the other end of the driving pump 92, one end of the first cooling row 94 is connected to one of the driving pumps 92, one end of the second cooling row 95 is connected to another driving pump 92, the other end of the first cooling row 94 is connected to another main liquid inlet pipe 71, and the other end of the second cooling row 95 is connected to another auxiliary liquid inlet pipe 72;

[0062] A high-temperature heating tube 11 is fixedly installed inside the first half chamber 23 and the second half chamber 33, and the inner wall of the high-temperature heating tube 11 is covered with a ceramic isolation layer 12;

[0063] The first casting box 2 and the second casting box 3 are both provided with square grooves inside, and a guide groove 14 is provided between every two of the square grooves.

[0064] After the casting is formed and cooled naturally, it needs to be heat treated. The heat treatment process mainly includes preheating, quenching and tempering, and the final cooling step;

[0065] Preheating: The first mold box 21 and the second mold box 31 are pushed together by the hydraulic cylinder 82, so that the second inner box 32 and the first inner box 22 are fitted together and the casting is buckled inside. At this time, the high-temperature heating tube 11 is used for heating. The outer side of the high-temperature heating tube 11 is filled with silicon carbide to conduct the gap between the high-temperature heating tube 11 and the ceramic isolation layer 12, and the casting is slowly heated to 500 to 800 degrees. The heat preservation time is generally two to three hours, so that the cast iron reaches a uniform temperature;

[0066] Quenching: Through the driving effect of the driving pump 92, the quenching oil is transferred to the inside of the main liquid inlet pipe 71 through the hose 91. The quenching medium is half selected from oil, water or solution, which can be selected according to the use situation, and then sent into the buffer cavity 73 by the main liquid inlet pipe 71. At this time, the internal space of the buffer cavity 73 is filled. Before this, the first mold box 21 and the second mold box 31 are in a state of being attached to each other. The sealed cavity formed by the second mold box 31 and the first mold box 21 is retracted at this time, so that the first inner box 2 2 and the second inner box 32 are completely retracted into the first mold box 21 and the second mold box 31, so that the first inner box 22 and the second inner box 32 are separated from the sealed state and are separated by a certain distance, so that the casting is in an unconstrained state and a corresponding distance is left. At this time, the movable inner shaft 61 extends forward, driving the silicon carbide sealing plate 65 to extend together, so that the silicon carbide sealing plate 65 and the inner wall of the ceramic isolation layer 12 are separated from the sealed state, so that the quenching oil enters the mold cavity formed by the first half cavity 23 and the second half cavity 33;

[0067] Through the subsequent oil pressure, the guide groove 14 will be connected to form a through space, so that the oil can enter from the main inlet pipe 71 on one side of the base 1 and then be discharged from the main inlet pipe 71 on the other side, and the heat will be continuously taken out. Figure 2 As shown, the oil enters from one side of the first casting box 2 and flows to the other side. During the flow, the first flowing liquid will first undergo heat exchange. When the flow continues, the subsequent oil will undergo heat exchange again, so that the heat inside the device will show a gradual cooling trend to avoid rapid heat cooling and affect the quenching quality. The flow rate of the oil can be adjusted by manually controlling the driving pump 92. The feed rate of the oil can be adjusted at any time according to the usage. The coolant after heat exchange will enter the first cooling row 94 through the connecting pipe 93, and then be cooled by the first cooling row 94, and finally flow into the main liquid inlet pipe 71 again, and realize the circulating cooling operation mode to reduce energy consumption. The auxiliary liquid inlet pipe 72 is added to ensure that the device can be put into different quenching cooling liquids at the same time.

[0068] Tempering: The movable inner shaft 61 is retracted to allow the silicon carbide sealing plate 65 to provide a sealed environment for the ceramic isolation layer 12. At the same time, the coolant remaining in the cavity is pumped out by the driving pump 92. At this time, the inner rod shaft 52 is advanced to make the first inner box 22 and the second inner box 32 fit each other, and the casting is buckled inside again. At the same time, the first mold box 21 and the second mold box 31 are also fitted together through the push of the hydraulic cylinder 82. At this time, the high-temperature heating tube 11 is used to heat the interior and heat it to the quenching temperature required for the casting, and keep it for a period of time.

[0069] The present invention also provides a precision casting process for ultra-high chromium cast balls, wherein:

[0070] S1. First, the ends of the first mold box 21 and the second mold box 31 are fitted together to make the internal mold cavity sealed. Then, the silicon carbide pouring tube 41 is inserted into the first semicircular groove 24, and the pouring plate 44 is placed on the top of the silicon carbide pouring tube 41. At this time, the metal liquid is poured into the mold cavity through the silicon carbide pouring tube 41 and the pouring plate 44. When the casting is formed and naturally cooled, the inner rod shaft 52 is slowly retracted to make the first inner box 22 and the second inner box 32 out of the sealed state, and the first mold box 21 and the second mold box 31 are separated, so that the molded casting falls down. At this time, it is connected through an external oil pump device, and a top-opening action is applied through the movable inner shaft 61 to make the casting out of the sticky state of the second half cavity 33 and the first semicircular groove 24;

[0071] S2. After the casting is formed and naturally cooled, it is necessary to heat treat the casting. The first mold box 21 and the second mold box 31 are pushed together by the hydraulic cylinder 82, so that the second inner box 32 and the first inner box 22 are fitted together and the casting is buckled inside. At this time, it is heated by the high-temperature heating tube 11, and the outer side of the high-temperature heating tube 11 is filled with silicon carbide for conducting the gap between the high-temperature heating tube 11 and the ceramic isolation layer 12, and the casting is slowly heated to 500 to 800 degrees. The heat preservation time is generally two to three hours, so that the cast iron reaches a uniform temperature;

[0072] S3, through the driving effect of the driving pump 92, the quenching oil is transferred to the inside of the main liquid inlet pipe 71 through the hose 91, and the quenching medium is half selected from oil, water or solution, which can be selected according to the use situation, and then sent into the buffer cavity 73 by the main liquid inlet pipe 71, and the internal space of the buffer cavity 73 is filled at this time. Before this, the first mold box 21 and the second mold box 31 are in a state of being fitted with each other, and the sealed cavity formed by the second mold box 31 and the first mold box 21 is formed by the inner rod shaft 52 retracting at this time, so that the first inner box 2 2 and the second inner box 32 are completely retracted into the first mold box 21 and the second mold box 31, so that the first inner box 22 and the second inner box 32 are separated from the sealed state and are separated by a certain distance, so that the casting is in an unconstrained state and a corresponding distance is left. At this time, the movable inner shaft 61 extends forward, driving the silicon carbide sealing plate 65 to extend together, so that the silicon carbide sealing plate 65 and the inner wall of the ceramic isolation layer 12 are separated from the sealed state, so that the quenching oil enters the mold cavity formed by the first half cavity 23 and the second half cavity 33.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A precision casting device for ultra-high chromium cast balls, comprising a base (1) and a first casting box (2) on the base (1), wherein the base (1) has two parts, and wherein: A first casting box (2) and a second casting box (3) are respectively mounted on the upper surfaces of the two bases (1), and the upper overall structures of the two bases (1) are consistent, and the first casting box (2) and the second casting box (3) are symmetrically mounted; The first casting box (2) comprises a first mold box (21), a first inner box (22) and a first half cavity (23); the first mold box (21) is slidably mounted on the upper surface of the base (1); the first inner box (22) is arranged inside the first mold box (21); and the first half cavity (23) is provided inside the first inner box (22); The second casting box (3) comprises a second molding box (31), a second inner box (32) and a second half cavity (33); the second molding box (31) is also slidably mounted on the upper surface of the base (1); the second inner box (32) is arranged inside the second molding box (31); and the first half cavity (23) is arranged inside the second inner box (32); One end of the first inner box (22) and the second inner box (32) are used for fitting connection, and the first half cavity (23) and the second half cavity (33) are combined to form a cavity, and the cavity is a mold cavity; The first casting box (2) further comprises a first semicircular groove (24) and a first limiting groove (25); the top of the first half cavity (23) is provided with a first semicircular groove (24) located at the upper end of the first inner box (22); and above the first semicircular groove (24) is provided a first limiting groove (25) located on the upper surface of the first casting box (21); The second casting box (3) further comprises a second semicircular groove (34) and a second limiting groove (35); the second semicircular groove (34) is provided at the top of the second half cavity (33); and the second limiting groove (35) is provided above the second semicircular groove (34) and is located on the upper surface of the second casting box (31); The second mold box (31) is fitted with the first mold box (21), the second inner box (32) is fitted with the first inner box (22), the first semicircular groove (24) and the second limiting groove (35) are combined to form a hole groove, a liquid guide frame (4) is installed in the hole groove, and the liquid guide frame (4) includes a silicon carbide pouring pipe (41), a plug-in foot (42), an upper end connecting seat (43) and a pouring plate (44), and the two first semicircular grooves (24) and the second semicircular grooves (34) are matched to form an annular groove. The annular groove is used to fix the silicon carbide pouring tube (41) therein; a plug-in foot (42) is provided at the bottom end of the silicon carbide pouring tube (41); the plug-in foot (42) is used to be embedded in the annular groove formed by the second semicircular groove (34) and the first semicircular groove (24); an upper end connecting seat (43) is provided at the top end of the silicon carbide pouring tube (41); a pouring tray (44) is installed above the silicon carbide pouring tube (41); and the silicon carbide pouring tube (41) is used to be plugged into the lower surface of the pouring tray (44); An outer hydraulic component (5) is installed at one end of the two first inner boxes (22) at the outermost edge of the first mold box (21), and the outer hydraulic component (5) comprises an outer cylinder (51) and an inner rod shaft (52). The inner rod shaft (52) is movably installed inside the outer cylinder (51), and one end of the inner rod shaft (52) is used to be fixed to one end of the first inner box (22); The outer hydraulic component (5) further comprises a first pressure chamber (53), a first piston (54) and a first external pipe (55); the first pressure chamber (53) located in the outer cylinder (51) is provided on the outer side of the inner rod shaft (52); the first piston (54) is provided on the outer surface of the outer cylinder (51); and the first external pipe (55) is fixedly mounted on one end of the outer cylinder (51); The first piston (54) and the first pressure chamber (53) are used to provide a driving force for the inner rod shaft (52); An inner hydraulic component (6) is also installed at one end of the inner rod shaft (52), and the inner hydraulic component (6) comprises a movable inner shaft (61), a second pressure chamber (62) and a second piston (63); the movable inner shaft (61) is slidably installed inside the inner rod shaft (52), the second pressure chamber (62) is provided at one end of the inner rod shaft (52), and the second piston (63) is fixedly installed on the outer surface of the movable inner shaft (61); The inner hydraulic component (6) further comprises a second external tube (64) and a silicon carbide sealing plate (65); the upper surface of one end of the inner rod shaft (52) is provided with the second external tube (64); one end of the movable inner shaft (61) is provided with a silicon carbide sealing plate (65); the silicon carbide sealing plate (65) is used to be embedded in the inner wall of the first half cavity (23); the curvature of one end of the silicon carbide sealing plate (65) is consistent with the inner wall of the first half cavity (23); the silicon carbide sealing plate (65) is used to be sealed and embedded in the first half cavity (23); each of the first external tube (55) and the second external tube (64) is supported by two centralizing tubes (13); A liquid guide port (7) is symmetrically provided on the outer side of the inner rod shaft (52), the liquid guide port (7) comprising a main liquid inlet pipe (71), a secondary liquid inlet pipe (72) and a buffer inner cavity (73); the main liquid inlet pipe (71) is provided on the upper surface of the inner rod shaft (52), the secondary liquid inlet pipe (72) is provided on the lower surface of the inner rod shaft (52), and the buffer inner cavity (73) is provided inside the inner rod shaft (52); A push frame (8) is also installed at the upper end of the base (1), and the push frame (8) includes a rear push seat (81), a hydraulic cylinder (82), a horizontal push plate (83), a slide rail (84) and a slide seat (85). The upper end of the base (1) is installed with a rear push seat (81), and the two ends of the rear push seat (81) are fixedly installed with hydraulic cylinders (82), and one end of the hydraulic cylinder (82) is fixedly installed with a horizontal push plate (83), and one end of the horizontal push plate (83) is symmetrically installed with a support column, and the support column is used to achieve a fixed state between the horizontal push plate (83) and the first mold box (21), and one end of the outer hydraulic component (5) is used to be fixedly installed with the horizontal push plate (83); The upper surface of the base (1) is symmetrically mounted with slide rails (84), and the lower surfaces of the horizontal push plate (83) and the first mold box (21) are both mounted with slide seats (85), and the slide seats (85) are used to slide the first mold box (21) and the horizontal push plate (83) on the upper surface of the slide rails (84); Two driving pumps (92) are fixedly mounted on one side of the base (1), and a hose (91) is fixedly mounted on the upper surface of each driving pump (92), wherein one of the driving pumps (92) is fixedly connected to the main liquid inlet pipe (71) via the hose (91), and the other driving pump (92) is fixedly connected to the auxiliary liquid inlet pipe (72) via another hose (91); A second cooling row (95) is fixedly mounted on one end of the base (1), a first cooling row (94) is mounted on the upper end of the second cooling row (95), a connecting pipe (93) is mounted on the other end of the driving pump (92), one end of the first cooling row (94) is connected to one of the driving pumps (92), one end of the second cooling row (95) is connected to another of the driving pumps (92), the other end of the first cooling row (94) is connected to another of the main liquid inlet pipes (71), and the other end of the second cooling row (95) is connected to another of the auxiliary liquid inlet pipes (72); A high-temperature heating tube (11) is fixedly installed inside the first half chamber (23) and the second half chamber (33), and the inner wall of the high-temperature heating tube (11) is coated with a ceramic isolation layer (12); The first casting box (2) and the second casting box (3) are both provided with square grooves inside, and a guide groove (14) is provided between every two of the square grooves.

2. A precision casting method using the precision casting equipment of the ultra-high chromium casting ball as claimed in claim 1, S1. First, the ends of the first mold box (21) and the second mold box (31) are fitted together to make the internal mold cavity sealed. Then, the silicon carbide pouring tube (41) is inserted into the first semicircular groove (24), and the pouring plate (44) is placed on the top of the silicon carbide pouring tube (41). At this time, the metal liquid is poured into the mold cavity through the silicon carbide pouring tube (41) and the pouring plate (44). When the casting is formed and naturally cooled, the inner rod shaft (52) is slowly retracted to make the first inner box (22) and the second inner box (32) break away from the sealed state, and the first mold box (21) and the second mold box (31) are separated to make the molded casting fall down. At this time, an external oil pump device is connected and a push-opening action is applied through the movable inner shaft (61) to make the casting break away from the sticky state between the second half cavity (33) and the first semicircular groove (24); S2. After the casting is formed and naturally cooled, it is necessary to perform heat treatment on the casting. The first mold box (21) and the second mold box (31) are pushed together by the hydraulic cylinder (82), so that the second inner box (32) and the first inner box (22) are fitted together and the casting is buckled inside. At this time, heating is performed by the high-temperature heating tube (11). The outer side of the high-temperature heating tube (11) is filled with silicon carbide for conducting the gap between the high-temperature heating tube (11) and the ceramic isolation layer (12). The casting is slowly heated to 500 to 800 degrees. The heat preservation time is generally two to three hours, so that the cast iron reaches a uniform temperature. S3. Through the driving effect of the driving pump (92), the quenching oil is transferred to the inside of the main liquid inlet pipe (71) through the hose (91). Half of the quenching medium is selected from oil, water or solution, which can be selected according to the usage. Then, it is sent into the buffer inner cavity (73) through the main liquid inlet pipe (71). At this time, the internal space of the buffer inner cavity (73) is filled. Before this, the first mold box (21) and the second mold box (31) are in a state of being attached to each other. The sealed cavity formed by the second mold box (31) and the first mold box (21) is now retracted through the inner rod shaft (52), so that the first inner box (2 2) The second inner box (32) is completely retracted into the first mold box (21) and the second mold box (31), so that the first inner box (22) and the second inner box (32) are separated from the sealed state and are separated by a certain distance, so that the casting is in an unconstrained state and a corresponding distance is left. At this time, the movable inner shaft (61) extends forward, driving the silicon carbide sealing plate (65) to extend together, so that the silicon carbide sealing plate (65) and the inner wall of the ceramic isolation layer (12) are separated from the sealed state, so that the quenching oil can enter the mold cavity formed by the first half cavity (23) and the second half cavity (33).

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