A liquid riser structure, a molding die, a casting device and a preparation method for anti-gravity filling of amorphous alloys

Abstract

A riser tube structure, a forming mold, a casting device and a preparation method for anti-gravity filling of amorphous alloys belong to the field of casting. In order to solve the problems of poor sealing of traditional riser tubes and molds, easy interface reaction with molten metal, low industrial reusability, etc., which seriously affect the effect and quality of anti-gravity casting of amorphous alloys. The riser tube structure, forming mold, linear drive and melting chamber of the present invention; the forming mold is installed above the melting chamber through a linear drive, the liquid outlet end of the riser tube structure is connected to the liquid inlet end of the forming mold, and the liquid inlet end of the riser tube structure is suspended above the socket of the melting chamber; when the amorphous alloy in the melting chamber is melted, the riser tube structure is driven by the linear drive, and the liquid inlet end of the riser tube structure is inserted from the socket of the melting chamber into the melting chamber to realize the diversion of the amorphous alloy melt; the present invention is mainly used for the preparation of amorphous alloy molded parts.

Description

Technical Field

[0001] The invention belongs to the field of casting, and in particular relates to a riser pipe structure, a forming mold, a casting device and a preparation method for anti-gravity filling of amorphous alloys. Background Art

[0002] Bulk amorphous alloys are regarded as the third revolution in the field of materials after steel and plastics, and their preparation process is also one of the major innovative technologies in the field of materials science in recent years. Due to its special structure and properties, it has broad application prospects in aerospace, automobile manufacturing, electronic equipment and other fields. However, there are several major problems restricting the industrial production and application of such materials. First, amorphous alloy raw materials contain active metals, which are easy to react with the riser and mold. For amorphous alloy melts, trace impurities will have a huge impact on the glass-forming ability of amorphous alloys, hindering their vitrification during the forming process. Secondly, the forming process of amorphous alloys requires a high cooling rate to ensure their glass-forming ability. Therefore, a mold that can cool quickly is needed to meet the critical cooling rate required for amorphous alloys. In addition, amorphous alloy melts have high viscosity and surface tension, and their filling process is also difficult. Especially in the filling of amorphous alloys under anti-gravity conditions, there are many technical difficulties. Amorphous alloy anti-gravity casting is an advanced casting process. By applying a reverse gravity field in the metal liquid, it can effectively reduce the contact between the metal liquid and the gas, reduce the generation of pores and inclusions, and improve the quality and forming efficiency of the casting. However, there are some problems with traditional riser tubes and molds, such as poor sealing, easy interface reaction with the metal liquid, and low industrial reusability. These problems seriously affect the effect and quality of amorphous alloys formed by anti-gravity casting. From the perspective of riser tube design, the traditional riser tube device is usually an integrated forming design with a rubber seal or a metal sealing mechanism, with high maintenance costs and poor reusability. Due to improper sealing, the matching riser tube will cause metal liquid leakage or gas ingress, thereby affecting the forming effect of anti-gravity casting; in addition, the sealing mechanism of the traditional matching riser tube device is complex, the maintenance cost is high, and it is not conducive to the stability and continuous production of the process. From the perspective of mold design, the traditional complex amorphous alloy component mold is relatively complex; the high viscosity of amorphous alloys is difficult to fill and the critical cooling rate also bring great challenges to mold design. Therefore, a new type of riser tube and mold design suitable for anti-gravity filling of amorphous alloys and a supporting sealing mechanism are needed to solve the problems existing in traditional devices. Summary of the invention

[0003] The present invention aims to solve the problems of poor sealing of traditional riser pipes and molds, easy interface reaction with molten metal, low industrial reusability, etc., which seriously affect the effect and quality of counter-gravity casting of amorphous alloys. Therefore, the present application provides a riser pipe structure, a molding mold, a casting device and a preparation method for counter-gravity filling of amorphous alloys.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A liquid riser structure for anti-gravity filling of amorphous alloys, the liquid riser structure comprising a split flange pipe and a liquid guide pipe, the split flange pipe comprising a base flange pipe and a sealing flange pipe, the pipe section 1 of the sealing flange pipe is inserted into the pipe section 2 of the base flange pipe from the flange opening of the base flange pipe, the flange 1 of the sealing flange pipe and the flange 2 of the base flange pipe are arranged opposite to each other up and down, and a flange sealing ring is arranged between the two, the flange 1 and the flange 2 are connected by bolts, and sealing is achieved under the action of the flange sealing ring; the liquid guide pipe is coaxially inserted into the pipe section 1 and the pipe section 2, and a sealing treatment is performed between the lower port of the pipe section 1, the inner wall of the pipe section 2 and the outer wall of the liquid guide pipe; the two ends of the liquid guide pipe extend out of the flange opening and the lower pipe opening of the split flange pipe respectively, the top end of the liquid guide pipe is connected to the liquid inlet of the forming mold, and the lower end of the liquid guide pipe extends into the smelting chamber of the casting device after the amorphous alloy is melted.

[0006] Preferably, the inner wall of the pipe segment two is divided into an expanded diameter section, a slope section and a narrow diameter section from top to bottom; the pipe segment one is inserted into the expanded diameter section of the pipe segment two, and an annular accommodating groove is formed between the lower port of the pipe segment one and the expanded diameter section and the slope section of the pipe segment two, and a filling sealing ring is arranged in the annular accommodating groove, the inner ring wall of the filling sealing ring is in close contact with the outer wall of the liquid guiding tube, and the outer ring wall of the filling sealing ring is in close contact with the expanded diameter section, the slope section and the lower port of the pipe segment one of the pipe segment two, so as to realize the sealing of the connection between the pipe segment one, the pipe segment two and the liquid guiding tube.

[0007] A forming mold for anti-gravity filling of an amorphous alloy, the forming mold comprising a left half mold unit, a right half mold unit and a vent plug; the left half mold unit and the right half mold unit have the same structure and are arranged relatively to each other. After the left half mold unit and the right half mold unit are closed, an upper exhaust hole, a metal liquid flow cavity, a straight runner and a lower connecting hole that are connected in sequence from top to bottom are formed inside, the vent plug is inserted in the upper exhaust hole, and the lower connecting hole is connected to a riser pipe structure. The amorphous alloy melt directly enters the metal liquid flow cavity from the riser pipe structure and is solidified and formed.

[0008] Preferably, the left half mold unit comprises a half mold body and a fastening block, the back of the half mold body is transversely processed with a fastening positioning groove, a slide block is transversely arranged on one side surface of the fastening block, the slide block of the fastening block is slidably connected in the fastening positioning groove of the half mold body, and the fastening block and the half mold body are connected by bolts; the fastening block is fixedly connected to the riser pipe structure and presses the half mold body onto the riser pipe structure;

[0009] After the half mold body and the fastening block are assembled by bolt connection, the lower surface of the half mold body protrudes from the lower surface of the fastening block.

[0010] Preferably, a plurality of exhaust holes are longitudinally opened on the half mold body, and the exhaust holes are connected with the upper surface of the half mold body and the inner cavity where the molten metal flows, so as to exhaust the molten metal after filling the mold;

[0011] The half mold body is provided with a heating pipe channel for heating the forming mold to improve the fluidity of the amorphous alloy melt in the forming mold; the half mold body is provided with a cooling channel inside to achieve rapid cooling of the amorphous alloy melt in the metal liquid flow cavity after filling.

[0012] A casting device for anti-gravity filling of an amorphous alloy, the casting device comprising a riser pipe structure, a forming die, a linear drive, a smelting chamber and a riser pipe heating structure; the forming die is installed above the smelting chamber through the linear drive, the liquid outlet end of the riser pipe structure is connected to the liquid inlet end of the forming die, the liquid inlet end of the riser pipe structure is suspended above the socket of the smelting chamber, and the riser pipe heating structure is arranged on both sides of the riser pipe structure and is used for heating the riser pipe structure; when the amorphous alloy masterbatch in the smelting chamber is melted, the riser pipe structure is driven by the linear drive, and the liquid inlet end of the riser pipe structure is inserted from the socket of the smelting chamber into the smelting chamber to realize the diversion of the amorphous alloy melt;

[0013] The liquid riser structure comprises a split flange pipe and a liquid guide pipe, wherein the liquid guide pipe is coaxially arranged in the split flange pipe and sealed with the pipe section of the split flange pipe, and the two ends of the liquid guide pipe extend out of the flange opening and the lower pipe opening of the split flange pipe respectively, the top end of the liquid guide pipe is connected to the liquid inlet of the forming mold, and the lower end of the liquid guide pipe extends into the melting chamber of the casting device after the amorphous alloy is melted;

[0014] The molding die comprises a left mold unit, a right mold unit and a vent plug; the left mold unit and the right mold unit have the same structure and are arranged opposite to each other, the left mold unit and the right mold unit are fixedly connected to the split flange pipe and molded together, and the interior of the left mold unit and the right mold unit form an upper exhaust hole, a metal liquid flow cavity, a straight runner and a lower connecting hole that are connected in sequence from top to bottom; the top end of the liquid guide tube in the liquid riser structure is inserted into the lower connecting hole of the molding die, and a runner sealing ring is arranged between the two to achieve sealing; the vent plug is inserted into the upper exhaust hole.

[0015] Preferably, the split flange pipe comprises a base flange pipe and a sealing flange pipe, the pipe section 1 of the sealing flange pipe is inserted into the pipe section 2 of the base flange pipe from the flange opening of the base flange pipe, the flange 1 of the sealing flange pipe and the flange 2 of the base flange pipe are arranged opposite to each other up and down, and a flange sealing ring is arranged between the two, the flange 1 and the flange 2 are connected by bolts, and sealing is achieved under the action of the flange sealing ring;

[0016] The inner wall of the pipe section two is divided into an expanded diameter section, a slope section and a narrow diameter section from top to bottom; the pipe section one is inserted into the expanded diameter section of the pipe section two, and an annular accommodating groove is formed between the lower end of the pipe section one and the expanded diameter section and the slope section of the pipe section two, and a filling sealing ring is arranged in the annular accommodating groove; the liquid guiding tube is coaxially inserted into the pipe section one and the pipe section two, the inner ring wall of the filling sealing ring is in close contact with the outer wall of the liquid guiding tube, and the outer ring wall of the filling sealing ring is in close contact with the expanded diameter section, the slope section and the lower end of the pipe section one of the pipe section two, so as to realize the sealing of the connection between the pipe section one, the pipe section two and the liquid guiding tube.

[0017] Preferably, a plurality of exhaust holes are longitudinally opened on the half mold body, and the exhaust holes are connected with the upper surface of the half mold body and the inner cavity where the molten metal flows, so as to exhaust the molten metal after filling the mold;

[0018] The half mold body is provided with a heating channel for heating the molding mold to improve the fluidity of the amorphous alloy melt in the molding mold; the half mold body is provided with a cooling channel inside to achieve rapid cooling of the amorphous alloy melt in the metal liquid flow cavity after filling.

[0019] Preferably, the liquid guide tube is made of inert material; the half-mold body is made of copper; and the fastening block is made of high-strength aluminum.

[0020] A method for preparing an amorphous alloy molded part, the specific preparation process is as follows:

[0021] S1, preparing amorphous master alloy raw materials;

[0022] S2, opening the hatch of the smelting chamber, and loading the amorphous master alloy raw materials with good proportion into the smelting chamber, and closing and sealing the hatch of the smelting chamber;

[0023] S3, after the riser tube structure and the forming mold are assembled, the forming mold is installed in the upper cavity of the casting device through a linear drive, and the liquid inlet end of the riser tube structure is suspended above the socket of the smelting chamber;

[0024] S4, evacuating the upper and lower chambers of the casting device until the vacuum degree is below 6 mPa;

[0025] S5, starting the liquid riser heating structure, which surrounds and heats the liquid guide tube until the temperature of the liquid guide tube is raised to 500° C. and kept warm, starting the heating tube in the molding die, preheating the molding die to 150° C. and keeping warm;

[0026] S6, start the smelting power supply of the smelting furnace and slowly increase the power until the material in the furnace is observed to be completely clear through the observation window, and the smelting temperature of the material is determined to be 130°C to 150°C above the melting point through the infrared temperature measurement system;

[0027] S7, when the amorphous alloy in the melting chamber is completely melted, the riser pipe heating structure is closed and retracted, the riser pipe structure and the forming mold are driven downward by the linear drive, and the liquid inlet end of the liquid guide pipe is inserted into the melting chamber until the second flange on the base flange pipe abuts against the socket of the melting chamber and is sealed;

[0028] S8, injecting inert gas into the melting chamber, and using a nonlinear segmented pressurization method to adjust the liquid pressure of the amorphous alloy melt; wherein, the pressurization speed in the liquid guide tube is 7.5 kPa / s, and the pressurization pressure from the liquid inlet to the liquid outlet of the liquid guide tube is increased from 0 to 14 kPa; the longitudinal direction from the bottom of the mold to the top of the mold is evenly divided into three pressurization stages, denoted as P1, P2 and P3, the pressurization speed of the P1 stage is 6.5 kPa / s, and the pressurization pressure is increased from 14 kPa to 19 kPa; the pressurization speed of the P2 stage is 4.5 kPa / s, and the pressurization pressure is increased from 19 kPa to 23 kPa; the pressurization speed of the P3 stage is 3.5 kPa / s, and the pressurization pressure is increased from 23 kPa to 26 kPa;

[0029] S9, the pressure acting on the liquid surface of the smelting chamber forces the amorphous alloy melt to flow up along the flow channel of the liquid guide tube, and gradually and steadily rise to the sprue and the metal liquid flow cavity; at the same time, the back pressure gas in the metal liquid flow cavity is discharged from the exhaust hole, which reduces the resistance of the amorphous alloy melt in the process of filling the metal liquid flow cavity, and ensures that the liquid level of the amorphous alloy melt rises steadily until the amorphous alloy melt fills the metal liquid flow cavity;

[0030] S10, after the filling is completed, high-purity nitrogen is quickly introduced into the cooling channel of the forming mold to quickly cool the forming mold and the amorphous alloy melt, and the furnace cavity is exhausted after the pressure in the melting chamber is maintained for 50 seconds;

[0031] S11, using a linear drive to lift the riser tube structure and the forming mold to separate the riser tube structure from the smelting chamber, and turning off the power supply of the smelting chamber;

[0032] S12, continuously introducing high-purity nitrogen into the cooling channel of the molding die until the casting is cooled and solidified; after the furnace chamber is purged with high-purity argon gas, the furnace door is opened, the molding die is removed from the casting, and the liquid guide tube is broken to achieve demolding.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The riser pipe and the split flange pipe in the present invention adopt a split structure, and the riser pipe can be pulled out from the split flange pipe to achieve replacement of the riser pipe to meet the anti-gravity casting filling of different active metals. At the same time, the molding mold can be reused, and the assembly and disassembly are performed by plugging and pulling, and the two can be quickly installed and separated, saving the time of molding preparation and improving processing efficiency.

[0035] 2. The split flange pipe in the present invention adopts a split structure, mainly to facilitate the fixation of the filling sealing ring, and the filling sealing ring, under the axial extrusion of the sealing flange pipe and the support of the slope section in the base flange pipe, concentrates part of the extrusion force on the riser pipe, thereby increasing the sealing between the filling sealing ring and the riser pipe. On the one hand, it ensures that the amorphous alloy melt in the melting chamber can all enter the riser pipe, and on the other hand, it can prevent the inert gas injected into the melting chamber from leaking out from the split flange pipe, making it impossible to guarantee the air pressure in the melting chamber.

[0036] 3. The riser tube in the present invention serves as a pipeline for transmitting the melt and also as a part of the molding mold. Therefore, the amorphous alloy molded part is fixed together with the riser tube after molding. In order to remove the riser tube from the amorphous alloy molded part, the riser tube needs to be cut off. The riser tube is a disposable product with a simple overall structure and is easy to manufacture, saving processing costs.

[0037] 4. In the present invention, a heating tube is provided to heat the molding mold, thereby improving the fluidity of the amorphous alloy melt, reducing the viscosity and surface tension of the amorphous alloy melt, and further achieving complete filling of the amorphous alloy melt, thereby ensuring the quality of the amorphous alloy molded parts; in the present invention, a cooling flow channel is provided, into which high-purity nitrogen is filled and circulated to achieve rapid cooling of the amorphous alloy melt in the metal liquid flow cavity after filling, so that the critical cooling rate of the amorphous alloy preparation meets the requirements.

[0038] 5. During the filling process of the amorphous alloy melt, since the amorphous alloy melt gradually rises from the bottom of the liquid guide tube to the metal liquid flow cavity of the molding mold against gravity, the cross-sectional area of ​​the flow channel changes in this rising stage, namely, the stage from the liquid guide tube to the sprue, the sprue rising stage, and the metal liquid flow cavity rising stage. In this process, the amorphous alloy melt is prone to turbulence and cannot achieve smooth filling. Therefore, the present invention adopts a nonlinear segmented pressurization method, that is, the rising path of the amorphous alloy melt is divided into 4 pressurization stages from bottom to top to ensure the smooth filling of the amorphous alloy melt, avoid turbulence, and improve the quality of the casting samples after molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are incorporated as part of this application and are used to provide a further understanding of the present invention.

[0040] Figure 1 It is a schematic structural diagram of the casting device of the present invention.

[0041] Figure 2 It is a schematic diagram of the structure after the riser tube structure and the forming mold are assembled.

[0042] Figure 3 It is a schematic diagram of the structure of the base flange pipe.

[0043] Figure 4 It is a structural diagram of the sealing flange pipe.

[0044] Figure 5 Schematic diagram of the structure of the riser tube.

[0045] Figure 6 It is a structural schematic diagram of the molding die.

[0046] Figure 7 This is an axonometric view of the molding die.

[0047] Figure 8 Schematic diagram of the internal structure of the left half mold unit.

[0048] Fig. 9 This is the axonometric view of the left half mold unit.

[0049] Fig.10 It is a schematic diagram of the structure of the cooling channel inside the half mold body.

[0050] Fig.11 Axonometric view of the tightening block.

[0051] Fig.12 Axonometric view of the exhaust plug.

[0052] Description of reference numerals: 1-base flange pipe; 1-1-pipe section 2; 1-1-1-expanded diameter section; 1-1-2-slope section; 1-1-3-narrow diameter section; 1-1-4-annular boss; 1-2-flange plate 2; 1-2-1-pin hole; 2-sealing flange pipe; 2-1-pipe section 1; 2-2-flange plate 1; 2-2-1-threaded hole; 3-filling sealing ring; 4-liquid riser; 5-flange plate sealing ring; 6-left half mold unit; 6-1-half mold body; 6-1-1-fastening positioning groove; 6-1-2-through light hole; 6- 1-3-inlet; 6-1-4-outlet; 6-1-5-cooling channel; 6-1-6-positioning blind hole; 6-1-7-exhaust hole; 6-2-fastening block; 6-2-1-slider; 7-right half mold unit; 8-exhaust plug; 9-upper exhaust hole; 10-metal liquid flow cavity; 11-lower connecting hole; 12-mold sealing ring; 13-sprue sealing ring; 14-sprue; 100-liquid pipe structure; 200-molding mold; 300-linear drive; 400-melting chamber; 500-liquid pipe heating structure. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0054] Embodiment 1: This embodiment aims to solve the problem that improper sealing of conventional fitted riser tubes may cause leakage of metal liquid or entry of gas, thus affecting the molding effect of counter-gravity casting; in addition, the sealing mechanism of the fitted riser tube is complex and the maintenance cost is high, which is not conducive to the stability of the process and continuous production, and the raw materials of amorphous alloys contain many active metals, which are prone to interfacial reactions with the riser tube. Therefore, this embodiment of the application provides a riser tube structure for counter-gravity filling of amorphous alloys.

[0055] See also Figures 2 to 5 The liquid riser structure is used for guiding the melt, and includes a split flange pipe and a liquid guide pipe 4; the liquid guide pipe 4 is coaxially arranged in the split flange pipe, and is sealed with the pipe section of the split flange pipe, and the two ends of the liquid guide pipe 4 extend out of the flange opening and the lower pipe opening of the split flange pipe respectively, the top end of the liquid guide pipe 4 is connected to the liquid inlet of the forming mold, and the lower end of the liquid guide pipe 4 extends into the melting chamber of the casting device after the amorphous alloy is melted.

[0056] In this embodiment, the liquid guide tube 4 and the split flange tube adopt a split structure, and the liquid guide tube 4 can be pulled out from the split flange tube to achieve replacement of the liquid guide tube 4 to meet the anti-gravity casting filling requirements of different active metals.

[0057] See also Figure 3 and Figure 4 The split flange pipe includes a base flange pipe 1 and a sealing flange pipe 2. The pipe section 1-2-1 of the sealing flange pipe 2 is inserted into the pipe section 2-1 of the base flange pipe 1 from the flange mouth of the base flange pipe 1. The flange plate 1-2-2 of the sealing flange pipe 2 is arranged opposite to the flange plate 2-1-2 of the base flange pipe 1 up and down, and is fixedly connected by bolts; the liquid guide pipe 4 is coaxially inserted into the pipe section 1-2-1 and the pipe section 2-1. The lower port of the pipe section 1-1, the inner wall of the pipe section 2-1 and the outer wall of the liquid guide pipe 4 are sealed to ensure that the amorphous alloy melt in the smelting chamber can completely flow into the molding mold from the flow channel of the liquid guide pipe 4 under pressure against gravity.

[0058] Furthermore, the axial length of the pipe segment 1 2 - 1 is 1 / 4 to 1 / 3 of the axial length of the pipe segment 2 1 - 1 , that is, the lower pipe opening of the pipe segment 1 2 - 1 is located in the upper middle position of the pipe segment 2 1 - 1 , so that the sealing treatment between the base flange tube 1 , the sealing flange tube 2 and the liquid guide tube 4 is located in the upper half of the liquid guide tube 4 .

[0059] Furthermore, the inner wall of the pipe segment 1-1 is divided into an expanded diameter segment 1-1-1, a slope segment 1-1-2 and a narrow diameter segment 1-1-3 from top to bottom; the outer diameter of the pipe segment 2-1 is smaller than the inner diameter of the expanded diameter segment 1-1-1 to achieve the insertion of the pipe segment 2-1; the inner diameter of the pipe segment 2-1 is equal to the inner diameter of the narrow diameter segment 1-1-3, so that the inner wall of the pipe segment 2-1 is flush with the inner wall of the narrow diameter segment 1-1-3 in the pipe segment 1-1; the pipe segment 2-1 is inserted into the expanded diameter segment 1-1 of the pipe segment 1-1 -1, an annular receiving groove is formed between the lower end of the pipe segment 1 2-1 and the slope section 1-1-2 of the pipe segment 2 1-1, and an annular filling sealing ring 3 is arranged in the annular receiving groove. The inner ring wall of the filling sealing ring 3 is in close contact with the outer wall of the liquid guiding tube 4, and the outer ring wall of the filling sealing ring 3 is in close contact with the expanded diameter section 1-1-1, the slope section 1-1-2 and the lower end of the pipe segment 1 2-1 of the pipe segment 2 1-1, so as to realize the sealing of the connection between the pipe segment 1 2-1, the pipe segment 2 1-1 and the liquid guiding tube 4.

[0060] Furthermore, the shape of the filling sealing ring 3 is the same as the shape of the annular receiving groove, that is, the top of the filling sealing ring 3 is flat and the bottom of the filling sealing ring 3 is conical. With this shape design, when the sealing flange tube 2 squeezes the filling sealing ring 3, it is more conducive to the inward expansion of the filling sealing ring 3, thereby achieving sealing between the split flange tube and the liquid guide tube 4.

[0061] Furthermore, a flange sealing ring 5 is provided between the flange 1 2 - 2 and the flange 2 1 - 2 to achieve sealing therebetween.

[0062] Furthermore, the flange 1-2 is provided with two inner and outer circles of threaded holes 2-2-1 along the circumferential direction, and the flange 2 1-2 is provided with two inner and outer circles of pin holes 1-2-1 along the circumferential direction. The threaded holes 2-2-1 are the same in number as the pin holes 1-2-1 and are arranged in one-to-one correspondence; the flange 1-2-2 and the flange 2 1-2 are fixedly connected via the threaded holes 2-2-1 and the pin holes 1-2-1 of the outer circle; the flange 1-2-2 and the flange 2 1-2 are fixedly connected to the molding mold via the threaded holes 2-2-1 and the pin holes 1-2-1 of the inner circle.

[0063] In this embodiment, the split flange tube adopts a split structure, mainly to facilitate the fixation of the filling sealing ring 3, and the filling sealing ring 3, under the axial extrusion of the sealing flange tube 2 and the support of the slope section 1-1-2 in the base flange tube 1, concentrates part of the extrusion force on the liquid guide tube 4, thereby increasing the sealing between the filling sealing ring 3 and the liquid guide tube 4. On the one hand, it ensures that the amorphous alloy melt in the melting chamber can completely enter the flow channel of the liquid guide tube 4 against gravity, and on the other hand, it can prevent the inert gas injected into the melting chamber from leaking out of the split flange tube, thereby affecting the metal liquid filling process.

[0064] See also Figure 5 A shoulder is provided on the outer ring wall of the liquid guide tube 4, and an integral annular boss 1-1-4 is provided at the lower port of the pipe section 2 1-1 in the base flange tube 1, and the shoulder of the liquid guide tube 4 abuts against the annular boss 1-1-4 of the pipe section 2 1-1. The liquid guide tube 4 is axially fixed under the clamping of the annular boss 1-1-4 and the forming mold. When the amorphous alloy melt enters the forming mold under air pressure, the liquid guide tube 4 will not move axially under the flushing of the amorphous alloy melt, thereby ensuring the forming quality of the amorphous alloy molded parts.

[0065] Furthermore, the liquid guide tube 4 is made of inert materials, including but not limited to metals, ceramics and other components. The composition of the specific material can be determined according to the exothermic reaction activity of the amorphous alloy melt. In this embodiment, the liquid guide tube 4 is preferably an inert ceramic sleeve. The inert ceramic sleeve has low reaction activity at high temperature and will not contaminate the amorphous alloy melt. It can avoid interfacial reaction with the amorphous alloy raw materials and can meet the anti-gravity casting filling of different active metals.

[0066] In this embodiment, the liquid guide tube 4 is used as a pipeline for transmitting the melt and as a part of the molding die, so the amorphous alloy molded part is fixed with the liquid guide tube 4 after molding. In order to remove the liquid guide tube 4 from the amorphous alloy molded part, the liquid guide tube 4 needs to be cut off, so the liquid guide tube 4 in this embodiment is a disposable product, and the overall structure of the liquid guide tube 4 in this embodiment is simple, easy to manufacture, and saves processing costs. At the same time, the liquid guide tube 4 and the split flange tube adopt a split design, which can realize the reuse of the split flange tube, and adopt the form of plugging and pulling for disassembly and assembly, and the two can realize quick installation and separation, saving the time of molding preparation and improving processing efficiency.

[0067] Embodiment 2: This embodiment is to solve the problem that the raw materials of amorphous alloys are prone to interface reaction with the mold, which hinders the vitrification during the forming process, and the forming process of the amorphous alloy cannot be cooled quickly to ensure its glass forming ability. In addition, the amorphous alloy melt has high viscosity and surface tension, and its filling process is also more difficult. Therefore, the embodiment of the present application provides a molding mold for anti-gravity filling of amorphous alloys.

[0068] See also Figures 6 to 12 The molding die comprises a left half mold unit 6, a right half mold unit 7 and an exhaust plug 8; the left half mold unit 6 and the right half mold unit 7 have the same structure and are arranged relatively to each other. After the left half mold unit 6 and the right half mold unit 7 are clamped by bolts, an upper exhaust hole 9, a metal liquid flow cavity 10, a straight runner 14 and a lower connecting hole 11 which are connected from top to bottom in sequence are formed inside. The exhaust plug 8 is inserted into the upper exhaust hole 9, and the lower connecting hole 11 is connected to the riser pipe structure. The amorphous alloy melt directly enters the metal liquid flow cavity 10 from the riser pipe structure and is solidified and formed.

[0069] In this embodiment, the molding die is a split structure, which facilitates the demoulding of the molded part.

[0070] See also Figure 8 The cross section of the sprue 14 gradually increases along the flow direction of the fluid, and the inner diameter of the lower end is slightly larger than the inner diameter of the upper end of the liquid guide tube 4, and is larger than 3 to 6 mm; the slope of the side wall of the sprue 14 is 50° to 70°.

[0071] In this embodiment, the cooperation between the sprue 14 and the liquid guide tube 4 is more conducive to the flow of the amorphous alloy melt to the two sides of the metal liquid flow cavity 10, so as to achieve complete filling of the metal liquid flow cavity 10.

[0072] See also Figure 8Before the left half mold unit 6 and the right half mold unit 7 are closed, a coating is sprayed on the inner wall of the metal liquid flow cavity 10 to improve the fluidity of the amorphous alloy melt; at the same time, the metal liquid flow cavity 10 has a draft angle of 3-6° for demolding.

[0073] See also Figure 7 The left half mold unit 6 includes a half mold body 6-1 and a fastening block 6-2. A fastening positioning groove 6-1-1 is transversely processed on the back of the half mold body 6-1. A slider 6-2-1 is transversely arranged on one side surface of the fastening block 6-2. The slider 6-2-1 of the fastening block 6-2 is slidably connected in the fastening positioning groove 6-1-1 of the half mold body 6-1, and the fastening block 6-2 is connected to the half mold body 6-1 by bolts; the fastening block 6-2 is fixedly connected to the riser pipe structure and presses the half mold body 6-1 onto the riser pipe structure.

[0074] Furthermore, a plurality of exhaust holes 6-1-7 are longitudinally opened on the half mold body 6-1, and the exhaust holes 6-1-7 are connected with the upper surface of the half mold body 6-1 and the metal liquid flow cavity 10 to achieve exhaust after the metal liquid is filled.

[0075] Furthermore, the exhaust holes 6-1-7 are micro exhaust holes of 0.5×0.3, and the number of the exhaust holes is 8.

[0076] Furthermore, after the half-mold body 6-1 and the fastening block 6-2 are assembled by bolt connection, the lower surface of the half-mold body 6-1 slightly protrudes from the lower surface of the fastening block 6-2, and the protruding height is 1 to 1.5 mm; when the fastening block 6-2 is fastened to the riser tube structure, the half-mold body 6-1 can be completely pressed against the riser tube structure to ensure the sealing of the connection between the molding mold and the riser tube structure.

[0077] Furthermore, a positioning blind hole 6-1-6 is respectively provided at one pair of diagonals of the left half mold unit 6, and a positioning pin is respectively provided at one pair of diagonals of the right half mold unit 7. The left half mold unit 6 and the right half mold unit 7 can achieve rapid positioning through the cooperation of the positioning blind hole 6-1-6 and the positioning pin.

[0078] Furthermore, the half-mold body 6-1 is provided with a heating tube channel, in which a heating tube is inserted for heating the molding mold, thereby improving the fluidity of the amorphous alloy melt, reducing the viscosity and surface tension of the amorphous alloy melt, and further achieving complete filling of the amorphous alloy melt, thereby ensuring the quality of the amorphous alloy molded parts; specifically, a through light hole 6-1-2 can be selected at the diagonals of the two side end faces of the half-mold body 6-1, and the heating tube can be inserted into the through light hole 6-1-2 to achieve heating of the half-mold body 6-1.

[0079] Furthermore, a cooling channel 6-1-5 is provided inside the half-mold body 6-1 to achieve rapid cooling of the molding mold, thereby achieving rapid cooling of the amorphous alloy melt in the metal liquid flow cavity 10 after the filling is completed; specifically, an inlet 6-1-3 and an outlet 6-1-4 can be selected at the diagonals of the end faces on both sides of the half-mold body 6-1, and a curved channel is formed between the inlet 6-1-3 and the outlet 6-1-4, preferably in an "S" shape, and high-purity nitrogen is injected into the cooling channel 6-1-5 to achieve rapid cooling of the amorphous alloy melt after the filling is completed.

[0080] Furthermore, the material of the half mold body 6-1 is copper, which has good thermal conductivity, so it can achieve rapid heating or rapid cooling of the amorphous alloy melt. The material of the fastening block 6-2 is high-strength aluminum, which ensures the strength of the bolt when tightening. At the same time, high-strength aluminum will basically not cause damage to the copper mold due to its material properties.

[0081] See also Fig. 9 The exhaust plug 8 is a rod-shaped structure, the bottom end of the exhaust plug 8 is wrapped with a refractory asbestos rope, and is fixed in the upper exhaust hole 9 by a top screw. The exhaust plug 8 serves the purpose of escaping fire and exhausting gas.

[0082] In this embodiment, a vent hole is opened at the top of the molding die for venting the metal liquid flow cavity 10 to ensure that the amorphous alloy melt can fill the metal liquid flow cavity 10, thereby ensuring the molding quality of the molded part.

[0083] In this embodiment, the forming mold is heated by a heating tube, and the amorphous alloy melt flows to the metal liquid flow cavity 10 under anti-gravity until the metal liquid flow cavity 10 is filled, and the exhaust plug 8 is fixed to the upper exhaust hole 9 with a top screw to achieve sealing. The amorphous alloy melt is quickly cooled by high-purity nitrogen, the forming mold and the riser structure are disassembled, and the left half mold unit 6 and the right half mold unit 7 are removed to obtain a molded part of the amorphous alloy melt.

[0084] Embodiment 3: This embodiment is to solve the problems that the raw materials of amorphous alloys contain a lot of active metals, which are easy to react with the riser and the mold, hindering the vitrification during the forming process; the forming process of amorphous alloys cannot achieve rapid cooling to ensure their glass forming ability; the amorphous alloy melt has high viscosity and surface tension, and its filling process is also more difficult. In addition, improper sealing of the matching riser will cause metal liquid leakage or gas intrusion, thereby affecting the forming effect of anti-gravity casting; in addition, the sealing mechanism of the traditional matching riser device is complex and the maintenance cost is high, which is not conducive to the stability of the process and continuous production; therefore, the embodiment of this application provides a molding device for anti-gravity filling of amorphous alloys.

[0085] See also Figures 1 to 12 The casting device includes a riser tube structure 100, a forming die 200, a linear drive 300, a smelting chamber 400 and a riser tube heating structure 500; the forming die 200 is installed above the smelting chamber through the linear drive 300, the liquid outlet end of the riser tube structure 100 is connected to the liquid inlet end of the forming die 200, the liquid inlet end of the riser tube structure 100 is suspended above the socket of the smelting chamber 400, and the riser tube heating structure 500 is arranged on both sides of the riser tube structure 100 and is used for heating the riser tube structure 100; when the amorphous alloy masterbatch in the smelting chamber 400 is melted, the riser tube structure 100 is driven by the linear drive 300, and the liquid inlet end of the riser tube structure 100 is inserted from the socket of the smelting chamber 400 into the smelting chamber 400 to realize the diversion of the amorphous alloy melt.

[0086] See also Figures 2 to 5 The liquid riser structure 100 is used for guiding the melt, and includes a split flange pipe and a liquid guide pipe 4. The liquid guide pipe 4 is coaxially arranged in the split flange pipe and is sealed with the pipe section of the split flange pipe. The two ends of the liquid guide pipe 4 extend out of the flange opening and the lower pipe opening of the split flange pipe respectively. The top end of the liquid guide pipe 4 is connected to the liquid inlet of the forming mold, and the lower end of the liquid guide pipe 4 extends into the melting chamber of the casting device after the amorphous alloy is melted.

[0087] In this embodiment, the liquid guide tube 4 and the split flange tube adopt a split structure, and the liquid guide tube 4 can be pulled out from the split flange tube to achieve replacement of the liquid guide tube 4 to meet the anti-gravity casting filling requirements of different active metals.

[0088] See also Figure 3 and Figure 4 The split flange pipe includes a base flange pipe 1 and a sealing flange pipe 2. The pipe section 1-2-1 of the sealing flange pipe 2 is inserted into the pipe section 2-1 of the base flange pipe 1 from the flange mouth of the base flange pipe 1. The flange plate 1-2-2 of the sealing flange pipe 2 is arranged opposite to the flange plate 2-1-2 of the base flange pipe 1 up and down, and is fixedly connected by bolts; the liquid guide pipe 4 is coaxially inserted into the pipe section 1-2-1 and the pipe section 2-1. The lower port of the pipe section 1-1, the inner wall of the pipe section 2-1 and the outer wall of the liquid guide pipe 4 are sealed to ensure that the amorphous alloy melt in the smelting chamber can completely flow into the molding mold from the flow channel of the liquid guide pipe 4 under pressure against gravity.

[0089] Furthermore, the axial length of the pipe segment 1 2 - 1 is 1 / 4 to 1 / 3 of the axial length of the pipe segment 2 1 - 1 , that is, the lower pipe opening of the pipe segment 1 2 - 1 is located in the upper middle position of the pipe segment 2 1 - 1 , so that the sealing treatment between the base flange tube 1 , the sealing flange tube 2 and the liquid guide tube 4 is located in the upper half of the liquid guide tube 4 .

[0090] Furthermore, the inner wall of the pipe segment 1-1 is divided into an expanded diameter segment 1-1-1, a slope segment 1-1-2 and a narrow diameter segment 1-1-3 from top to bottom; the outer diameter of the pipe segment 2-1 is smaller than the inner diameter of the expanded diameter segment 1-1-1 to achieve the insertion of the pipe segment 2-1; the inner diameter of the pipe segment 2-1 is equal to the inner diameter of the narrow diameter segment 1-1-3, so that the inner wall of the pipe segment 2-1 is flush with the inner wall of the narrow diameter segment 1-1-3 in the pipe segment 1-1; the pipe segment 2-1 is inserted into the expanded diameter segment 1-1 of the pipe segment 1-1 -1, an annular receiving groove is formed between the lower end of the pipe segment 1 2-1 and the slope section 1-1-2 of the pipe segment 2 1-1, and an annular filling sealing ring 3 is arranged in the annular receiving groove. The inner ring wall of the filling sealing ring 3 is in close contact with the outer wall of the liquid guiding tube 4, and the outer ring wall of the filling sealing ring 3 is in close contact with the expanded diameter section 1-1-1, the slope section 1-1-2 and the lower end of the pipe segment 1 2-1 of the pipe segment 2 1-1, so as to realize the sealing of the connection between the pipe segment 1 2-1, the pipe segment 2 1-1 and the liquid guiding tube 4.

[0091] Furthermore, the shape of the filling sealing ring 3 is the same as the shape of the annular receiving groove, that is, the top of the filling sealing ring 3 is flat and the bottom of the filling sealing ring 3 is conical. With this shape design, when the sealing flange tube 2 squeezes the filling sealing ring 3, it is more conducive to the inward expansion of the filling sealing ring 3, thereby achieving sealing between the split flange tube and the liquid guide tube 4.

[0092] Furthermore, a flange sealing ring 5 is provided between the flange 1 2 - 2 and the flange 2 1 - 2 to achieve sealing therebetween.

[0093] Furthermore, the flange 1-2 is provided with two inner and outer circles of threaded holes 2-2-1 along the circumferential direction, and the flange 2-1 is provided with two inner and outer circles of pin holes 1-2-1 along the circumferential direction. The threaded holes 2-2-1 are the same in number as the pin holes 1-2-1 and are arranged in one-to-one correspondence; the flange 1-2-2 and the flange 2-1-2 are fixedly connected through the threaded holes 2-2-1 and the pin holes 1-2-1 of the outer circle; the flange 1-2-2 and the flange 2-1-2 are fixedly connected to the molding mold through the threaded holes 2-2-1 and the pin holes 1-2-1 of the inner circle.

[0094] In this embodiment, the split flange tube adopts a split structure, mainly to facilitate the fixation of the filling sealing ring 3, and the filling sealing ring 3, under the axial extrusion of the sealing flange tube 2 and the support of the slope section 1-1-2 in the base flange tube 1, concentrates part of the extrusion force on the liquid guide tube 4, thereby increasing the sealing between the filling sealing ring 3 and the liquid guide tube 4. On the one hand, it ensures that the amorphous alloy melt in the melting chamber can completely enter the flow channel of the liquid guide tube 4 against gravity, and on the other hand, it can prevent the inert gas injected into the melting chamber from leaking out of the split flange tube, thereby affecting the metal liquid filling process.

[0095] See also Figure 5 A shoulder is provided on the outer ring wall of the liquid guide tube 4, and an integral annular boss 1-1-4 is provided at the lower port of the pipe section 2 1-1 in the base flange tube 1, and the shoulder of the liquid guide tube 4 abuts against the annular boss 1-1-4 of the pipe section 2 1-1. The liquid guide tube 4 is axially fixed under the clamping of the annular boss 1-1-4 and the forming mold. When the amorphous alloy melt enters the forming mold under air pressure, the liquid guide tube 4 will not move axially under the flushing of the amorphous alloy melt, thereby ensuring the forming quality of the amorphous alloy molded parts.

[0096] Furthermore, the liquid guide tube 4 is made of inert materials, including but not limited to metals, ceramics and other components. The composition of the specific material can be determined according to the exothermic reaction activity of the amorphous alloy melt. In this embodiment, the liquid guide tube 4 is preferably an inert ceramic sleeve. The inert ceramic sleeve has low reaction activity at high temperature and will not contaminate the amorphous alloy melt. It can avoid interfacial reaction with the amorphous alloy raw materials and can meet the anti-gravity casting filling of different active metals.

[0097] In this embodiment, the liquid guide tube 4 is used as a pipeline for transmitting the melt and as a part of the molding die, so the amorphous alloy molded part is fixed with the liquid guide tube 4 after molding. In order to remove the liquid guide tube 4 from the amorphous alloy molded part, the liquid guide tube 4 needs to be cut off, so the liquid guide tube 4 in this embodiment is a disposable product, and the overall structure of the liquid guide tube 4 in this embodiment is simple, easy to manufacture, and saves processing costs. At the same time, the liquid guide tube 4 and the split flange tube adopt a split design, which can realize the reuse of the split flange tube, and adopt the form of plugging and pulling for disassembly and assembly, and the two can realize quick installation and separation, saving the time of molding preparation and improving processing efficiency.

[0098] See also Figures 6 to 12The molding die comprises a left mold unit 6, a right mold unit 7 and an exhaust plug 8; the left mold unit 6 and the right mold unit 7 have the same structure and are arranged opposite to each other. After the left mold unit 6 and the right mold unit 7 are closed by bolts, an upper exhaust hole 9, a metal liquid flow cavity 10 and a lower connection hole 11 which are connected from top to bottom are formed inside. The left mold unit 6 and the right mold unit 7 are fixedly connected to the split flange pipe, and the top end of the liquid guide tube 4 in the liquid riser structure 100 is inserted into the lower connection hole 11 of the molding die 200, and a runner sealing ring 13 is arranged between the two to achieve sealing; the exhaust plug 8 is inserted into the upper exhaust hole 9, and the amorphous alloy melt directly enters the metal liquid flow cavity 10 from the liquid riser structure 100 and is solidified and formed.

[0099] In this embodiment, the molding die is a split structure, which facilitates the demoulding of the molded part.

[0100] For further information, see Figure 6 The cross section of the sprue 14 gradually increases along the flow direction of the fluid, and the inner diameter of the lower end is slightly larger than the inner diameter of the upper end of the liquid guide tube 4, and is larger than 3 to 6 mm; the slope of the side wall of the sprue 14 is 50° to 70°.

[0101] In this embodiment, the cooperation between the sprue 14 and the liquid guide tube 4 is more conducive to the flow of the amorphous alloy melt to the two sides of the metal liquid flow cavity 10, so as to achieve complete filling of the metal liquid flow cavity 10.

[0102] For further information, see Figure 6 Before the left half mold unit 6 and the right half mold unit 7 are closed, a coating is sprayed on the inner wall of the metal liquid flow cavity 10 to improve the fluidity of the amorphous alloy melt; at the same time, the metal liquid flow cavity 10 has a draft angle of 3-6° for demolding.

[0103] See also Figure 7 The left half mold unit 6 includes a half mold body 6-1 and a fastening block 6-2. The back of the half mold body 6-1 is transversely processed with a fastening positioning groove 6-1-1, and a slider 6-2-1 is transversely arranged on one side surface of the fastening block 6-2. The slider 6-2-1 of the fastening block 6-2 is slidably connected in the fastening positioning groove 6-1-1 of the half mold body 6-1, and the fastening block 6-2 and the half mold body 6-1 are connected by bolts; the fastening block 6-2 is connected to the threaded hole 2-2-1 and the pin hole 1-2-1 of the inner circle on the split flange pipe in the riser pipe structure 100 by bolts, and the half mold body 6-1 is pressed against the riser pipe structure, and a mold sealing ring 12 is arranged between the molding mold 200 and the split flange pipe to achieve sealing between the two.

[0104] Furthermore, a plurality of exhaust holes 6-1-7 are longitudinally opened on the half mold body 6-1, and the exhaust holes 6-1-7 are connected with the upper surface of the half mold body 6-1 and the metal liquid flow cavity 10 to achieve exhaust after the metal liquid is filled.

[0105] Furthermore, the exhaust holes 6-1-7 are micro exhaust holes of 0.5×0.3, and the number of the exhaust holes is 8.

[0106] Furthermore, after the half-mold body 6-1 and the fastening block 6-2 are assembled by bolt connection, the lower surface of the half-mold body 6-1 slightly protrudes from the lower surface of the fastening block 6-2, and the protruding height is 1 to 1.5 mm; when the fastening block 6-2 is fastened to the riser tube structure, the half-mold body 6-1 can be completely pressed against the riser tube structure to ensure the sealing of the connection between the molding mold and the riser tube structure.

[0107] Furthermore, a heating tube channel is opened on the half-mold body 6-1, and a heating tube is inserted in the heating tube channel for heating the half-mold body 6-1, thereby improving the fluidity of the amorphous alloy melt in the molding mold, reducing the viscosity and surface tension of the amorphous alloy melt, and further achieving complete filling of the amorphous alloy melt, thereby ensuring the quality of the amorphous alloy molded parts; specifically, a through light hole 6-1-2 can be opened at the diagonal positions of the two side end faces of the half-mold body 6-1, and the heating tube is inserted in the through light hole 6-1-2 to achieve heating of the half-mold body 6-1.

[0108] Furthermore, a cooling channel 6-1-5 is provided inside the half-mold body 6-1 to achieve rapid cooling of the molding mold, and further achieve rapid cooling of the amorphous alloy melt in the half-mold body 6-1 after filling. Specifically, an inlet 6-1-3 and an outlet 6-1-4 can be provided at the diagonals of the end faces on both sides of the half-mold body 6-1, respectively, to form a curved channel between the inlet 6-1-3 and the outlet 6-1-4, preferably in an "S" shape, and high-purity nitrogen is injected into the cooling channel 6-1-5 to achieve rapid cooling of the amorphous alloy melt after filling.

[0109] Furthermore, the material of the half mold body 6-1 is copper, which has good thermal conductivity, so it can achieve rapid heating or rapid cooling of the amorphous alloy melt. The material of the fastening block 6-2 is high-strength aluminum, which ensures the strength of the bolt when tightening. At the same time, high-strength aluminum will basically not cause damage to the copper mold due to its material properties.

[0110] Furthermore, the materials of the flange sealing ring 5, the mold sealing ring 12 and the runner sealing ring 13 include but are not limited to graphite, PTFE gaskets and other high-temperature resistant sealing materials; the material of the filling sealing ring 3 includes but is not limited to graphite paper and other high-temperature resistant sealing materials.

[0111] See also Fig. 9 The exhaust plug 8 is a rod-shaped structure, the bottom end of the exhaust plug 8 is wrapped with a refractory asbestos rope, and is fixed in the upper exhaust hole 9 by a top screw. The exhaust plug 8 serves the purpose of escaping fire and exhausting gas.

[0112] In this embodiment, the linear drive 300 may be a cylinder or a screw-nut mechanism.

[0113] In this embodiment, a vent hole is opened at the top of the molding die for venting the metal liquid flow cavity 10 to ensure that the amorphous alloy melt can fill the metal liquid flow cavity 10, thereby ensuring the molding quality of the molded part.

[0114] In this embodiment, the forming mold is heated by a heating tube, and the amorphous alloy melt flows into the metal liquid flow cavity 10 under anti-gravity, and the amorphous alloy melt is injected until the metal liquid flow cavity 10 is filled, and the exhaust plug 8 is fixed to the upper exhaust hole 9 with a top screw to achieve sealing. The amorphous alloy melt is quickly cooled by high-purity nitrogen, the forming mold and the riser structure are disassembled, and the left half mold unit 6 and the right half mold unit 7 are removed to obtain a molded part of the amorphous alloy melt.

[0115] In this embodiment, the overall design of the riser structure 100 and the forming mold 200 is simple and efficient, and is equipped with multi-channel and multi-angle seals, which can prevent leakage, air leakage and gas intrusion of the amorphous alloy melt, thereby improving the casting quality and forming efficiency.

[0116] The following further describes the assembly process of the molding die and the riser tube structure to further demonstrate the working principle and advantages of the present invention:

[0117] S1, insert the catheter 4 into the cavity of the base flange tube 1, and achieve axial positioning by relying on the annular boss 1-1-4 below the base flange tube 1;

[0118] S2, placing the flange seal ring 5 in the seal ring groove I on the base flange pipe 1, and excessively inserting the filling seal ring 3 into the pipe section 1-1 of the base flange pipe 1;

[0119] S3, put the sealing flange tube 2 on the liquid guide tube 4, and compact the filling sealing ring 3, and fix the base flange tube 1 and the sealing flange tube 2 by bolts to achieve a close fit between the base flange tube 1 and the sealing flange tube 2;

[0120] S4, put the mold sealing ring 12 into the sealing ring groove II above the sealing flange tube 2, and place the runner sealing ring 13 on the top of the liquid guide tube 4;

[0121] S5, the left half mold unit 6 and the right half mold unit 7 are quickly positioned through the positioning blind holes 6-1-6 and the positioning pins, and the two are fixed with bolts; the molding mold is sleeved on the top of the liquid guide tube 4, and then the left half mold unit 6 and the right half mold unit 7 are fixed on the base flange tube 1 and the sealing flange tube 2 by using their own fastening blocks, and the mold sealing ring 12 and the runner sealing ring 13 are compacted;

[0122] S6, insert the exhaust plug 8 into the exhaust hole 9 at the upper end of the molding die, and tighten it with a push screw.

[0123] Embodiment 4:

[0124] This embodiment provides a method for preparing an amorphous alloy molded part, and the specific preparation process is as follows:

[0125] S1, prepare amorphous master alloy raw materials:

[0126] S11, prepare Zr-based amorphous alloy masterbatch according to a certain ratio, with specific mass percentages as follows: Zr: ~62.61%, Ti: ~11.01, Cu: ~13.23%, Ni: ~9.78%, Be: ~3.38%, grind the original material to remove the oxide film, use acetone ultrasonic cleaning for 5 minutes, dry and place it in an induction shell melting furnace; start the mechanical pump, Roots pump and molecular pump respectively, pump the vacuum degree of the melting chamber to below 6mPa, and inject argon as an inert gas protection gas to 20Pa; then start the induction melting power supply, gradually increase it to 30kW, and after the sample is cleared, maintain the same power for ~5 minutes, and then tilt the crucible to take out the sample;

[0127] S12, using argon gas and a mechanical pump to repeatedly wash the smelting chamber for 5 times to remove harmful steam; then open the furnace door, take samples, crush the samples, and detect the alloy composition of the samples. If serious volatilization and burning of elements occur during the re-smelting process, repeat the second half of step S11 to perform material replenishment, and then repeat this step until the alloy composition test result meets the batching error requirement;

[0128] S2, open the hatch of the smelting chamber 400, and put the amorphous master alloy raw materials with good proportion into the smelting chamber 400, and close the hatch of the smelting chamber 400 and seal it;

[0129] S3, prepare for debugging the casting machine. After the riser pipe structure 100 and the forming mold 200 are assembled, the forming mold 200 is installed in the upper cavity of the casting device through the linear drive 300, and the liquid inlet end of the riser pipe structure 100 is suspended above the socket of the smelting chamber 400;

[0130] S4, close the furnace door of the smelting chamber 400, start the mechanical pump, the Roots pump and the molecular pump respectively, evacuate the upper and lower chambers of the casting device until the vacuum degree is below 6mPa, and lock the furnace door;

[0131] S5, start the liquid riser heating structure 500, the liquid riser heating structure 500 surrounds and heats the liquid guide tube 4 until the temperature of the liquid guide tube 4 is raised to 500° C., start the heating tube in the molding die 200, and preheat the molding die 200 to 150° C.;

[0132] S6, start the smelting power supply of the smelting furnace and slowly increase the power until the material in the furnace is observed to be completely clear through the observation window, and the smelting temperature of the material is determined to be 130°C to 150°C above the melting point through the infrared temperature measurement system;

[0133] S7, when the amorphous alloy in the smelting chamber 400 is completely melted, the liquid riser structure 100 and the forming mold 200 are driven by the cylinder to move downward, and the liquid inlet end of the liquid guide tube 4 is inserted into the smelting chamber 400 until the flange plate 2 1-2 on the base flange pipe 1 abuts against the socket of the smelting chamber 400 and is sealed;

[0134] S8, inject inert gas into the melting chamber 400, and use a nonlinear segmented pressurization method to adjust the liquid pressure of the amorphous alloy melt; wherein, the pressurization speed in the liquid guide tube is 7.5 kPa / s, and the pressurization pressure from the liquid inlet to the liquid outlet of the liquid guide tube is increased from 0 to 14 kPa; from the bottom to the top of the mold (the liquid inlet of the sprue 14 to the exhaust port of the upper exhaust hole 9) is longitudinally divided into 3 pressurization stages, denoted as P1, P2 and P3, the pressurization speed of the P1 stage is 6.5 kPa / s, and the pressurization pressure gradually increases from 14 kPa to 19 kPa; the pressurization speed of the P2 stage is 4.5 kPa / s, and the pressurization pressure gradually increases from 19 kPa to 23 kPa; the pressurization speed of the P3 stage is 3.5 kPa / s, and the pressurization pressure gradually increases from 23 kPa to 26 kPa; it should be noted that the entire pressurization stage is a gradual pressure increase, not a rapid pressure increase;

[0135] S9, the pressure acting on the liquid surface of the smelting chamber 400 forces the amorphous alloy melt to flow up along the flow channel of the liquid guide tube 4, and gradually and steadily rise to the sprue 14 and the metal liquid flow cavity 10; at the same time, the back pressure gas in the metal liquid flow cavity 10 is discharged from the exhaust hole 6-1-7, reducing the resistance of the amorphous alloy melt in the process of filling the metal liquid flow cavity 10, ensuring the smooth rise of the liquid surface of the amorphous alloy melt until the amorphous alloy melt fills the metal liquid flow cavity 10;

[0136] S10, after the filling is completed, high-purity nitrogen is quickly introduced into the cooling channel 6-1-5 of the forming mold to quickly cool the forming mold and the amorphous alloy melt after the filling is completed, and the furnace cavity is vented after the pressure in the melting furnace is maintained for 50 seconds;

[0137] S11, using a cylinder to lift the riser tube structure 100 and the forming mold 200, to separate the riser tube structure 100 from the smelting chamber 400, and turning off the power supply of the smelting chamber 400;

[0138] S12, continuously introduce high-purity nitrogen into the cooling channel 6-1-5 of the forming mold 200 until the casting is cooled and solidified; repeatedly use high-purity argon gas to purge the furnace chamber, open the furnace door after at least 5 purges, remove the forming mold from the casting, and break the liquid guide tube 4 to achieve demolding, thereby completing the manufacture of the casting.

[0139] In the present embodiment, during the filling process of the amorphous alloy melt, since the amorphous alloy melt gradually rises from the bottom of the liquid guide tube to the metal liquid flow inner cavity of the molding mold against gravity, the cross-sectional area of ​​the flow channel changes in this rising stage, i.e., the stage from the liquid guide tube to the sprue, the sprue rising stage, and the metal liquid flow inner cavity rising stage. In this process, the amorphous alloy melt is prone to turbulence and cannot achieve smooth filling. Therefore, the present invention adopts a nonlinear segmented pressurization method, i.e., the rising path of the amorphous alloy melt is divided into 4 pressurization stages from bottom to top (liquid guide tube stage, P1, P2 and P3 stages) to ensure the smooth filling of the amorphous alloy melt, avoid turbulence, and improve the quality of the casting samples after molding.

[0140] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A liquid riser structure for anti-gravity filling of amorphous alloys, characterized in that: The liquid riser structure comprises a split flange pipe and a liquid guide pipe (4), wherein the split flange pipe comprises a base flange pipe (1) and a sealing flange pipe (2), wherein the pipe section 1 (2-1) of the sealing flange pipe (2) is inserted into the pipe section 2 (1-1) of the base flange pipe (1) from the flange opening of the base flange pipe (1), the flange plate 1 (2-2) of the sealing flange pipe (2) and the flange plate 2 (1-2) of the base flange pipe (1) are arranged opposite to each other in the upper and lower parts, and a flange plate sealing ring (5) is arranged between the two, and the flange plate 1 (2-2) and the flange plate 2 (1-2) are connected to each other. The connection is made by bolts, and sealing is achieved under the action of the flange sealing ring (5); the liquid guide tube (4) is coaxially inserted into the pipe section one (2-1) and the pipe section two (1-1), and a sealing treatment is performed between the lower end of the pipe section one (2-1), the inner wall of the pipe section two (1-1) and the outer wall of the liquid guide tube (4); the two ends of the liquid guide tube (4) extend out of the flange opening and the lower pipe opening of the split flange pipe respectively, the top end of the liquid guide tube (4) is connected to the liquid inlet of the forming mold, and the lower end of the liquid guide tube (4) extends into the melting chamber of the casting device after the amorphous alloy is melted.

2. A riser tube structure for anti-gravity filling of amorphous alloy according to claim 1, characterized in that: The inner wall of the pipe section 2 (1-1) is divided into an expanded diameter section (1-1-1), a slope section (1-1-2) and a narrow diameter section (1-1-3) from top to bottom; the pipe section 1 (2-1) is inserted into the expanded diameter section (1-1-1) of the pipe section 2 (1-1), and an annular receiving groove is formed between the lower end of the pipe section 1 (2-1) and the expanded diameter section (1-1-1) and the slope section (1-1-2) of the pipe section 2 (1-1). A filling seal ring (3) is arranged in the shaped receiving groove, the inner ring wall of the filling seal ring (3) is in close contact with the outer wall of the liquid guiding tube (4), and the outer ring wall of the filling seal ring (3) is in close contact with the expanded diameter section (1-1-1) and the slope section (1-1-2) of the second pipe section (1-1) and the lower end of the first pipe section (2-1), so as to achieve sealing at the connection between the first pipe section (2-1), the second pipe section (1-1) and the liquid guiding tube (4).

3. A forming die for anti-gravity filling of amorphous alloys, characterized in that: The molding die comprises a left mold unit (6), a right mold unit (7) and a vent plug (8); the left mold unit (6) and the right mold unit (7) have the same structure and are arranged relative to each other. After the left mold unit (6) and the right mold unit (7) are molded together, an upper vent hole (9), a metal liquid flow cavity (10), a sprue (14) and a lower connection hole (11) are formed inside the mold, which are connected from top to bottom in sequence. The vent plug (8) is inserted into the upper vent hole (9), and the lower connection hole (11) is connected to the riser pipe structure. The amorphous alloy melt directly enters the metal liquid flow cavity (10) from the riser pipe structure and is solidified and formed.

4. A forming die for anti-gravity filling of amorphous alloy according to claim 3, characterized in that: The left half mold unit (6) comprises a half mold body (6-1) and a fastening block (6-2), the back of the half mold body (6-1) is transversely processed with a fastening groove (6-1-1), and a sliding block (6-2-1) is transversely arranged on one side surface of the fastening block (6-2), the sliding block (6-2-1) of the fastening block (6-2) is slidably connected in the fastening groove (6-1-1) of the half mold body (6-1), and the fastening block (6-2) and the half mold body (6-1) are connected by bolts; the fastening block (6-2) is fixedly connected to the riser pipe structure and presses the half mold body (6-1) onto the riser pipe structure; After the half mold body (6-1) and the fastening pressing block (6-2) are assembled by bolt connection, the lower surface of the half mold body (6-1) protrudes from the lower surface of the fastening pressing block (6-2).

5. A forming die for anti-gravity filling of amorphous alloy according to claim 4, characterized in that: A plurality of exhaust holes (6-1-7) are longitudinally opened on the half mold body (6-1), and the exhaust holes (6-1-7) are connected with the upper surface of the half mold body (6-1) and the inner cavity (10) where the molten metal flows, so as to exhaust the molten metal after filling the mold; The half mold body (6-1) is provided with a heating pipe channel for heating the molding mold to improve the fluidity of the amorphous alloy melt in the molding mold; the half mold body (6-1) is provided with a cooling channel (6-1-5) inside to achieve rapid cooling of the amorphous alloy melt in the metal liquid flow cavity (10) after filling.

6. A casting device for anti-gravity filling of amorphous alloys, characterized in that: The casting device comprises a riser pipe structure (100), a forming die (200), a linear drive (300), a smelting chamber (400) and a riser pipe heating structure (500); the forming die (200) is installed above the smelting chamber (400) through the linear drive (300), the liquid outlet end of the riser pipe structure (100) is connected to the liquid inlet end of the forming die (200), and the liquid inlet end of the riser pipe structure (100) is suspended above the smelting chamber (400). The riser pipe heating structure (500) is arranged on both sides of the riser pipe structure (100) and is used to heat the riser pipe structure (100); when the amorphous alloy masterbatch in the smelting chamber (400) is melted, the riser pipe structure (100) is driven by the linear drive (300) so that the liquid inlet end of the riser pipe structure (100) is inserted from the socket of the smelting chamber (400) into the smelting chamber (400) to realize the diversion of the amorphous alloy melt; The liquid riser structure (100) comprises a split flange pipe and a liquid guide pipe (4), wherein the liquid guide pipe (4) is coaxially arranged in the split flange pipe and sealed with the pipe section of the split flange pipe, and the two ends of the liquid guide pipe (4) extend out of the flange opening and the lower pipe opening of the split flange pipe respectively, the top end of the liquid guide pipe (4) is connected to the liquid inlet of the forming mold (200), and the lower end of the liquid guide pipe (4) extends into the melting chamber of the casting device after the amorphous alloy is melted; The molding die (200) comprises a left mold unit (6), a right mold unit (7) and a vent plug (8); the left mold unit (6) and the right mold unit (7) have the same structure and are arranged opposite to each other; the left mold unit (6) and the right mold unit (7) are fixedly connected to the split flange pipe and molded together; the left mold unit (6) and the right mold unit (7) form an upper exhaust hole (9), a metal liquid flow cavity (10), a sprue (14) and a lower connection hole (11) which are connected in sequence from top to bottom; the top end of the liquid guide tube (4) in the liquid riser structure (100) is inserted into the lower connection hole (11) of the molding die (200), and a sprue sealing ring (13) is arranged between the two to achieve sealing; the vent plug (8) is inserted into the upper exhaust hole (9); The left half mold unit (6) comprises a half mold body (6-1) and a fastening block (6-2), the back of the half mold body (6-1) is transversely processed with a fastening groove (6-1-1), and a sliding block (6-2-1) is transversely arranged on one side surface of the fastening block (6-2), the sliding block (6-2-1) of the fastening block (6-2) is slidably connected in the fastening groove (6-1-1) of the half mold body (6-1), and the fastening block (6-2) and the half mold body (6-1) are connected by bolts; the fastening block (6-2) is fixedly connected to the riser pipe structure and presses the half mold body (6-1) onto the riser pipe structure; After the half mold body (6-1) and the fastening pressing block (6-2) are assembled by bolt connection, the lower surface of the half mold body (6-1) protrudes from the lower surface of the fastening pressing block (6-2).

7. A casting device for anti-gravity filling of amorphous alloys according to claim 6, characterized in that: The split flange pipe comprises a base flange pipe (1) and a sealing flange pipe (2), wherein the pipe section 1 (2-1) of the sealing flange pipe (2) is inserted into the pipe section 2 (1-1) of the base flange pipe (1) from the flange opening of the base flange pipe (1), the flange plate 1 (2-2) of the sealing flange pipe (2) and the flange plate 2 (1-2) of the base flange pipe (1) are arranged opposite to each other in the upper and lower parts, and a flange plate sealing ring (5) is arranged between the two, the flange plate 1 (2-2) and the flange plate 2 (1-2) are connected by bolts, and sealing is achieved under the action of the flange plate sealing ring (5); The inner wall of the pipe section 2 (1-1) is divided into an expanded diameter section (1-1-1), a slope section (1-1-2) and a narrow diameter section (1-1-3) from top to bottom; the pipe section 1 (2-1) is inserted into the expanded diameter section (1-1-1) of the pipe section 2 (1-1); an annular receiving groove is formed between the lower end of the pipe section 1 (2-1) and the expanded diameter section (1-1-1) and the slope section (1-1-2) of the pipe section 2 (1-1); a filling sealing ring is arranged in the annular receiving groove (3); the liquid guiding tube (4) is coaxially inserted into the pipe section one (2-1) and the pipe section two (1-1); the inner ring wall of the filling sealing ring (3) is in close contact with the outer wall of the liquid guiding tube (4); the outer ring wall of the filling sealing ring (3) is in close contact with the expanded diameter section (1-1-1) and the slope section (1-1-2) of the pipe section two (1-1) and the lower end of the pipe section one (2-1), so as to achieve sealing at the connection between the pipe section one (2-1), the pipe section two (1-1) and the liquid guiding tube (4).

8. A casting device for anti-gravity filling of amorphous alloys according to claim 7, characterized in that: A plurality of exhaust holes (6-1-7) are longitudinally opened on the half mold body (6-1), and the exhaust holes (6-1-7) are connected with the upper surface of the half mold body (6-1) and the inner cavity (10) where the molten metal flows, so as to exhaust the molten metal after filling the mold; The half mold body (6-1) is provided with a heating channel for heating the molding mold (200) to improve the fluidity of the amorphous alloy melt in the molding mold (200); the half mold body (6-1) is provided with a cooling channel (6-1-5) inside to achieve rapid cooling of the amorphous alloy melt in the metal liquid flow cavity (10) after filling.

9. A casting device for anti-gravity filling of amorphous alloys according to claim 8, characterized in that: The liquid guide tube (4) is made of inert material; the material of the half-mold body (6-1) is copper; and the material of the fastening block (6-2) is high-strength aluminum.

10. A method for preparing an amorphous alloy molded part, characterized in that: Based on the casting device according to claim 8 or 9, the specific preparation process is as follows: S1, preparing amorphous master alloy raw materials; S2, opening the hatch of the smelting chamber (400), loading the amorphous master alloy raw materials with a good proportion into the smelting chamber (400), and closing and sealing the hatch of the smelting chamber (400); S3, after the riser tube structure (100) and the forming mold (200) are assembled, the forming mold (200) is installed in the upper cavity of the casting device through a linear drive (300), and the liquid inlet end of the riser tube structure (100) is suspended above the socket of the smelting chamber (400); S4, evacuating the upper and lower chambers of the casting device until the vacuum degree is below 6 mPa; S5, starting the liquid riser heating structure (500), the liquid riser heating structure (500) surrounds and heats the liquid guide tube (4), until the temperature of the liquid guide tube (4) is raised to 500° C. and kept warm, starting the heating tube in the molding die (200), preheating the molding die (200) to 150° C. and keeping warm; S6, start the smelting power supply of the smelting furnace and slowly increase the power until the material in the furnace is observed to be completely clear through the observation window, and the smelting temperature of the material is determined to be 130°C to 150°C above the melting point through the infrared temperature measurement system; S7, when the amorphous alloy in the smelting chamber is completely melted, the riser pipe heating structure (500) is closed and retracted, the riser pipe structure (100) and the forming mold (200) are driven downward by the linear drive (300), and the liquid inlet end of the liquid guide tube (4) is inserted into the smelting chamber (400) until the flange plate 2 (1-2) on the base flange pipe (1) abuts against the socket of the smelting chamber (400) and is sealed; S8, injecting inert gas into the smelting chamber (400), and adjusting the liquid pressure of the amorphous alloy melt by nonlinear segmented pressurization; wherein the pressurization speed in the liquid guide tube is 7.5 kPa / s, and the pressurization pressure from the liquid inlet to the liquid outlet of the liquid guide tube is increased from 0 to 14 kPa; the longitudinal direction from the mold bottom to the mold top is evenly divided into three pressurization stages, denoted as P1, P2 and P3, the pressurization speed of the P1 stage is 6.5 kPa / s, and the pressurization pressure is increased from 14 kPa to 19 kPa; the pressurization speed of the P2 stage is 4.5 kPa / s, and the pressurization pressure is increased from 19 kPa to 23 kPa; the pressurization speed of the P3 stage is 3.5 kPa / s, and the pressurization pressure is increased from 23 kPa to 26 kPa; S9, the pressure acting on the liquid surface of the smelting chamber (400) forces the amorphous alloy melt to flow up along the flow channel of the liquid guide tube (4), and gradually and steadily rise to the sprue (14) and the metal liquid flow cavity (10); at the same time, the back pressure gas in the metal liquid flow cavity (10) is discharged from the exhaust hole (6-1-7), thereby reducing the resistance of the amorphous alloy melt in the process of filling the metal liquid flow cavity (10), and ensuring that the liquid level of the amorphous alloy melt rises steadily until the amorphous alloy melt fills the metal liquid flow cavity (10); S10, after the filling is completed, high-purity nitrogen is quickly introduced into the cooling channel (6-1-5) of the forming mold (200) to quickly cool the forming mold (200) and the amorphous alloy melt, and at the same time, the furnace chamber (400) is vented after the pressure is maintained for 50 seconds; S11, using a linear drive (300) to lift the riser tube structure (100) and the forming mold (200), so as to separate the riser tube structure (100) from the smelting chamber (400), and turning off the power supply of the smelting chamber (400); S12, continuously introducing high-purity nitrogen into the cooling channel (6-1-5) of the molding die (200) until the casting is cooled and solidified; after the furnace chamber is purged with high-purity argon gas, the furnace door is opened, the molding die (200) is removed from the casting, and the liquid guide tube (4) is broken to achieve demoulding.

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