Titanium alloy die-casting equipment for piercing machine top head

Abstract

The application provides a titanium alloy die casting equipment for piercing machine top head, and relates to the technical field of metal die casting equipment. The equipment comprises a die casting body, a die casting pipe, a smelting chamber, a hydraulic push rod, a first conical hole, a cooling cover and an exhaust pipe. The first conical hole is arranged on the inner wall of the die casting pipe, and its flow cross section is automatically adjusted according to the temperature of the titanium alloy solution. When the temperature rises, the cross section becomes smaller, and when the temperature drops, the cross section becomes larger. The cooling cover is arranged on the outer side of the die casting pipe and is connected with circulating cooling liquid. The exhaust pipe is arranged at the discharging end of the first conical hole to collect the overflowed gas. When the gas amount in the exhaust pipe increases or decreases, the flow cross section of the water inlet end of the cooling cover changes correspondingly. When the temperature is high, the cross section becomes smaller to prolong the liquid residence time and cooperate with cooling to reduce surface contamination. When the temperature is low, the cross section becomes larger to accelerate the filling to prevent solidification. The cross section change synchronously enhances the turbulent shear force to make the bubbles overflow and reduce the pore defects. The exhaust capacity self-adapts the cooling liquid supply amount to realize on-demand cooling and save the cooling liquid.

Description

Technical Field

[0001] This invention relates to the field of metal die-casting equipment technology, and in particular to a titanium alloy die-casting equipment for a piercing machine mandrel. Background Technology

[0002] The piercing mill mandrel is a core hot-working tool in the hot rolling piercing process of seamless steel pipes. During service, it must withstand high temperatures, high pressures, and intense friction, placing extremely high demands on the high-temperature performance of the material. Titanium alloys, due to their excellent high-temperature resistance and resistance to thermal fatigue, have become an ideal material for manufacturing long-life mandrels. Using die casting to prepare them can significantly improve production efficiency and obtain dense castings.

[0003] Titanium alloy molten liquid has extremely high chemical reactivity, making it difficult to precisely control the temperature and flow rate during die casting. Excessive temperature can cause interfacial reactions with the mold coating, resulting in surface contamination; insufficient temperature reduces fluidity, easily leading to incomplete filling or cold shut defects. Furthermore, if gases trapped in the titanium molten liquid cannot be effectively expelled, they will form subcutaneous pores after solidification, reducing the density of the casting. In addition, existing cooling methods lack adaptive matching to the actual cooling requirements of the titanium molten liquid; excessive coolant supply results in waste, while insufficient supply fails to effectively suppress interfacial reactions. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a titanium alloy die-casting device for the mandrel of a piercing machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A titanium alloy die-casting device for a piercing mill mandrel includes: a die-casting body; an injection tube for containing a titanium alloy solution to be injected; a melting chamber connected to the injection tube for inputting the molten titanium alloy solution into the injection tube; a hydraulic push rod disposed inside the injection tube for injecting the titanium alloy solution into a mold at a constant pressure; a first conical orifice disposed on the inner wall of the injection tube, the size of the flow cross-section of the first conical orifice being automatically adjustable according to the temperature of the titanium alloy solution, decreasing when the temperature increases and increasing when the temperature decreases; a cooling shroud sleeved on the outside of the injection tube, through which circulating coolant is introduced to cool the titanium alloy solution injected from the discharge end of the first conical orifice; and an exhaust pipe disposed at the discharge end of the first conical orifice for collecting gas overflowing from the titanium alloy solution, wherein the flow cross-section of the water inlet end of the cooling shroud increases or decreases when the amount of gas in the exhaust pipe increases or decreases.

[0006] Preferably, a ceramic block is coaxially fixed to the inner wall of the injection tube, the first conical hole is opened through the middle of the ceramic block, a ceramic fixing plate is vertically fixed to the inner wall of the injection tube, a ceramic guide sleeve is horizontally fixed to the side of the ceramic fixing plate, a graphite rod is fixed to the inner bottom surface of the ceramic guide sleeve, the outer surface of the graphite rod is in contact with the inner surface of the ceramic guide sleeve, and a ceramic ball is fixed to the end of the graphite rod, the ceramic ball being located inside the first conical hole.

[0007] Preferably, the central axis of the ceramic ball is collinear with the central axis of the first conical hole, the ceramic ball is always located inside the first conical hole, and the ceramic ball reciprocates along the central axis of the first conical hole.

[0008] Preferably, the cooling cover is coaxially fixed on the outer wall of the injection tube, and the upper two sides of the cooling cover are respectively fixedly connected to an inlet pipe and an outlet pipe. The side wall of the inlet pipe is fixedly connected to a cold water inlet, the inlet end of the cold water inlet is fixedly connected to the outlet end of an external small water chiller, and the inlet end of the small water chiller is fixedly connected to the outlet end of the outlet pipe.

[0009] Preferably, a fixing block is coaxially fixed at the lower end of the inner wall of the water inlet pipe, and a through second conical hole is opened in the middle of the fixing block. A metal ball is arranged on the central axis of the second conical hole. The metal ball moves vertically up and down along the axis to adjust the flow cross section of the second conical hole to increase or decrease. When the amount of gas in the exhaust pipe increases or decreases, the metal ball is driven to move vertically up or down.

[0010] Preferably, the exhaust pipe is fixedly connected to the upper end of the injection pipe, and a porous, breathable ceramic baffle is fixedly provided at the lower end of the inner wall of the exhaust pipe.

[0011] Preferably, a spring is fastened to the upper end of the porous breathable ceramic partition, a piston plate is fastened to the upper end of the spring, the piston plate is slidably connected to the inner surface of the exhaust pipe, and a U-shaped rod is fastened between the upper end of the metal ball and the upper end of the piston plate, and the U-shaped rod is slidably connected to the middle of the upper end of the water inlet pipe.

[0012] Preferably, the space between the upper end of the porous permeable ceramic separator and the lower end of the piston plate is used to store the overflowing gas.

[0013] Preferably, a retaining ring is fixedly provided on the inner wall of the upper end of the exhaust pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The flow cross-section of the first conical orifice automatically adjusts with the temperature of the titanium alloy solution. At higher temperatures, the cross-section decreases, reducing the overall flow rate and extending the residence time. Combined with the water-cooled walls of the cooling shroud, this lowers the titanium alloy solution to the minimum necessary temperature before entering the mold cavity, thereby inhibiting interfacial reactions between the titanium alloy solution and the mold's ceramic coating or core, and reducing surface contamination. At lower temperatures, the cross-section increases, allowing the titanium alloy solution to pass through quickly, completing high-speed filling before solidification. 2. A smaller cross-section forces an increase in local flow velocity, which in turn enhances turbulent shearing, causing bubbles in the titanium alloy solution to be torn apart and escape. Similarly, a larger cross-section at low temperatures in titanium alloy solutions can also increase turbulent shearing force, causing gas to escape. Regardless of temperature or cross-section size, turbulent shearing can promote the separation and expulsion of gas in the titanium alloy solution, reducing porosity defects during casting solidification. 3. When the amount of gas collected in the exhaust pipe increases, it indicates that the titanium alloy solution temperature is high and the gas content is high. The flow cross-section at the water inlet of the cooling shroud automatically increases, increasing the coolant flow rate to enhance the cooling effect. Conversely, when the amount of gas decreases, it indicates that the titanium alloy solution temperature is low and the gas content is low. The flow cross-section at the water inlet of the cooling shroud automatically decreases, reducing the coolant flow rate. By adaptively adjusting the coolant supply through exhaust volume, on-demand cooling is achieved, avoiding insufficient or excessive cooling and conserving coolant. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the titanium alloy die-casting equipment for the piercing machine mandrel according to an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the titanium alloy die-casting equipment for the piercing machine mandrel according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the reduced flow cross-section of the second conical hole in the titanium alloy die-casting equipment for the piercing machine mandrel according to an embodiment of the present invention. Figure 4 This is a schematic diagram showing the increased flow cross-section of the second conical hole in the titanium alloy die-casting equipment for the piercing machine mandrel according to an embodiment of the present invention. Figure 5 This is a schematic diagram showing the increased flow cross-section of the first conical hole in the titanium alloy die-casting equipment for the piercing machine mandrel according to an embodiment of the present invention. Figure 6 This is a schematic diagram showing the reduced flow cross-section of the first conical hole in the titanium alloy die-casting equipment for the piercing machine mandrel according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the overall three-dimensional structure of the piston plate and its connected structure in the titanium alloy die-casting equipment for the piercing machine mandrel according to an embodiment of the present invention; Figure 8 for Figure 2 Enlarged view of the structure at point A in the image.

[0016] In the diagram: 100, die-cast body; 200, injection tube; 300, melting chamber; 400, ceramic block; 401, first conical hole; 402, ceramic ball; 403, graphite rod; 404, ceramic guide sleeve; 405, ceramic fixing plate; 500, cooling cover; 501, water inlet pipe; 502, cold water inlet; 503, water outlet pipe; 600, exhaust pipe; 601, porous breathable ceramic partition; 602, spring; 603, piston plate; 604, U-shaped rod; 605, metal ball; 606, fixing block; 607, second conical hole; 700, hydraulic push rod. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0019] like Figures 1-8 As shown, this embodiment of the invention provides a titanium alloy die-casting device for a piercing machine mandrel, comprising: a die-cast body 100; an injection tube 200 for containing a titanium alloy solution to be injected; a melting chamber 300 connected to the injection tube 200 for inputting the molten titanium alloy solution into the injection tube 200; a hydraulic push rod 700 disposed within the injection tube 200 for injecting the titanium alloy solution within the injection tube 200 into the mold at a constant pressure; and a first conical hole 401 disposed on the inner wall of the injection tube 200, wherein the flow cross-section of the first conical hole 401 is large. The flow cross section automatically adjusts according to the temperature of the titanium alloy solution. When the temperature rises, the flow cross section decreases, and when the temperature drops, the flow cross section increases. The cooling shroud 500 is sleeved on the outside of the injection tube 200. Circulating coolant is introduced into the cooling shroud 500 to cool the titanium alloy solution injected from the discharge end of the first conical hole 401. The exhaust pipe 600 is located at the discharge end of the first conical hole 401 to collect the gas overflowing from the titanium alloy solution. When the amount of gas in the exhaust pipe 600 increases or decreases, the flow cross section at the water inlet end of the cooling shroud 500 increases or decreases.

[0020] In this embodiment, at a constant injection speed, when the temperature of the titanium alloy solution is high, the flow cross section of the first conical orifice 401 becomes smaller. The reduced flow area forces the local flow velocity to increase, which in turn enhances turbulent shearing. The bubbles in the titanium alloy solution are torn apart and overflow. At the same time, the smaller flow cross section reduces the overall flow rate. The residence time of the titanium alloy solution in the injection tube 200 and the flow channel is extended. It is cooled down by the water-cooled wall of the cooling shroud 500. The titanium alloy solution is reduced to the minimum necessary temperature before entering the mold cavity, thereby suppressing the interfacial reaction between the titanium alloy solution and the mold ceramic coating or core and reducing surface contamination. When the temperature of the titanium alloy solution is low, the flow cross section of the first conical hole 401 becomes larger, and the titanium alloy solution passes through quickly, completing high-speed filling before solidification. The injection speed of the titanium alloy solution is inversely related to the temperature. When the temperature is high, the titanium alloy solution is cooled down slowly before being put into the mold. When the temperature is low, the speed is accelerated to prevent solidification. The smaller and larger cross sections correspond to the titanium alloy solutions at their respective temperatures, which can increase the turbulent shear force and cause the gas to overflow. A cooling shroud 500 is fitted on the outside of the injection tube 200. Circulating coolant is introduced into the cooling shroud 500 to cool the titanium alloy solution injected from the discharge end of the first conical hole 401. An exhaust pipe 600 is provided at the discharge end of the first conical hole 401 to collect the gas overflowing from the titanium alloy solution. When the amount of gas collected in the exhaust pipe 600 increases, it indicates that the titanium alloy solution temperature is high and the gas content is high. At this time, the flow cross section of the water inlet end of the cooling cover 500 automatically increases to increase the coolant flow rate and enhance the cooling effect. When the amount of gas collected in the exhaust pipe 600 decreases, it indicates that the titanium alloy solution temperature is low and the gas content is low. At this time, the flow cross section of the water inlet end of the cooling cover 500 automatically decreases to reduce the coolant flow rate, thereby achieving adaptive and appropriate cooling and saving coolant.

[0021] like Figure 2 , Figure 5 and Figure 6 As shown, optionally, a ceramic block 400 is coaxially fixed to the inner wall of the injection tube 200, and a first conical hole 401 is opened through the middle of the ceramic block 400. A ceramic fixing plate 405 is vertically fixed to the inner wall of the injection tube 200, and a ceramic guide sleeve 404 is horizontally fixed to the side of the ceramic fixing plate 405. A graphite rod 403 is fixed to the inner bottom surface of the ceramic guide sleeve 404. The outer surface of the graphite rod 403 is in contact with the inner surface of the ceramic guide sleeve 404, and a ceramic ball 402 is fixed to the end of the graphite rod 403. The ceramic ball 402 is located in the first conical hole 401.

[0022] Specifically, the small-diameter end of the first conical hole 401 faces the mold direction, and the large-diameter end faces the hydraulic push rod 700 direction. A ceramic fixing plate 405 is vertically fixed on the inner wall of the injection tube 200. The ceramic fixing plate 405 is located on the side of the ceramic block 400 facing the hydraulic push rod 700. A ceramic guide sleeve 404 is horizontally fixed on the side of the ceramic fixing plate 405. The ceramic guide sleeve 404 is cylindrical, and its axis is collinear with the central axis of the first conical hole 401. A graphite rod 403 is fixed on the inner bottom surface of the ceramic guide sleeve 404. The end of the graphite rod 403 extends towards the first conical hole 401. The outer surface of the graphite rod 403 slides in contact with the inner surface of the ceramic guide sleeve 404. A ceramic ball 402 is fixed on the end of the graphite rod 403. The ceramic ball 402 is located inside the first conical hole 401.

[0023] In this optional embodiment, when the temperature of the titanium alloy solution rises, the graphite rod 403 expands linearly along the axial direction due to heat, pushing the ceramic ball 402 to move towards the small-diameter end of the first conical hole 401. The annular flow gap between the ceramic ball 402 and the inner wall of the first conical hole 401 decreases, and the flow cross-section becomes smaller. When the temperature of the titanium alloy solution decreases, the graphite rod 403 contracts and retracts, driving the ceramic ball 402 to move towards the large-diameter end of the first conical hole 401. The annular flow gap increases, and the flow cross-section becomes larger.

[0024] like Figure 5 and Figure 6 As shown, optionally, the central axis of the ceramic ball 402 is collinear with the central axis of the first conical hole 401, the ceramic ball 402 is always located inside the first conical hole 401, and the ceramic ball 402 reciprocates along the central axis of the first conical hole 401.

[0025] Specifically, the ceramic ball 402 is made of silicon nitride ceramic material, and its outer surface is a smooth spherical surface. The central axis of the ceramic ball 402 is always collinear with the central axis of the first conical hole 401. Driven by the graphite rod 403, the ceramic ball 402 moves back and forth inside the first conical hole 401 along the central axis direction of the first conical hole 401. During the movement, the ceramic ball 402 never leaves the range of the first conical hole 401.

[0026] In this optional embodiment, the central axis of the ceramic ball 402 is collinear with the central axis of the first conical hole 401, ensuring that the annular flow gap formed between the ceramic ball 402 and the inner wall of the conical hole is uniform in the circumferential direction, and the titanium alloy solution is stable when passing through.

[0027] like Figure 2As shown, optionally, the cooling cover 500 is coaxially fixed on the outer wall of the injection tube 200. The upper two sides of the cooling cover 500 are respectively fixedly connected to the water inlet pipe 501 and the water outlet pipe 503. The side wall of the water inlet pipe 501 is fixedly connected to the cold water port 502. The water inlet end of the cold water port 502 is fixedly connected to the water outlet end of the external small water chiller. The water inlet end of the small water chiller is fixedly connected to the water outlet end of the water outlet pipe 503.

[0028] Specifically, the cooling cover 500 is coaxially sleeved and fixed on the outer wall of the injection tube 200. An annular cooling water jacket is formed between the inner wall of the cooling cover 500 and the outer wall of the injection tube 200. The inlet pipe 501 is used to input low-temperature coolant into the cooling water jacket, and the outlet pipe 503 is used to discharge the high-temperature coolant after heat exchange. The side wall of the inlet pipe 501 is fixedly connected to the cold water port 502. The inlet end of the cold water port 502 is fixedly connected to the outlet end of the external small water chiller. The inlet end of the small water chiller is fixedly connected to the outlet end of the outlet pipe 503, forming a closed-loop circulation system for coolant.

[0029] In this optional embodiment, the small water chiller cools the coolant and then sends it into the annular water jacket inside the cooling shroud 500 through the cold water inlet 502 and the water inlet pipe 501. As the coolant flows through the outer wall of the injection tube 200, it carries away the heat of the titanium alloy solution. The cooled coolant, after heat exchange, flows back to the small water chiller through the water outlet pipe 503 for further cooling. The water inlet pipe 501, the water outlet pipe 503, and the cold water inlet 502 constitute a complete circulating cooling circuit. Combined with the flow rate adjustment by the first conical orifice 401, the titanium alloy solution is effectively cooled during its residence period, ensuring that it enters the mold cavity at the lowest necessary temperature.

[0030] like Figure 2 and Figure 8 As shown, optionally, a fixing block 606 is coaxially fixed at the lower end of the inner wall of the water inlet pipe 501. A through second conical hole 607 is opened in the middle of the fixing block 606. A metal ball 605 is arranged on the central axis of the second conical hole 607. The metal ball 605 moves vertically up and down along the axis to adjust the flow cross section of the second conical hole 607 to become larger or smaller. When the amount of gas in the exhaust pipe 600 increases or decreases, the metal ball 605 is driven to move vertically up or down.

[0031] Specifically, with the large-diameter end of the second conical orifice 607 facing upwards and the small-diameter end facing downwards, the annular flow gap between the metal ball 605 and the inner wall of the second conical orifice 607 increases when the metal ball 605 rises, thus increasing the flow cross-section of the second conical orifice 607; conversely, the annular flow gap decreases when the metal ball 605 falls, thus decreasing the flow cross-section of the second conical orifice 607. When the amount of gas in the exhaust pipe 600 increases, it drives the metal ball 605 to move vertically upwards, increasing the flow cross-section; conversely, when the amount of gas decreases, it drives the metal ball 605 to move vertically downwards, decreasing the flow cross-section.

[0032] In this optional embodiment, an increase in the gas volume within the exhaust pipe 600 indicates a higher temperature and greater gas content in the titanium alloy solution. In this case, the metal ball 605 rises, increasing the flow cross-section of the second conical orifice 607 and increasing the coolant flow rate into the cooling shroud 500, thus enhancing the cooling effect. Conversely, a decrease in the gas volume within the exhaust pipe 600 indicates a lower temperature and less gas content in the titanium alloy solution. In this case, the metal ball 605 descends, decreasing the flow cross-section of the second conical orifice 607 and reducing the coolant flow rate. By adaptively adjusting the coolant supply through exhaust volume, on-demand cooling is achieved, avoiding insufficient cooling leading to excessively high titanium solution temperature or over-cooling causing energy waste.

[0033] like Figure 2 and Figure 7 As shown, optionally, the exhaust pipe 600 is fixedly connected to the upper end of the injection pipe 200, and a porous permeable ceramic baffle 601 is fixedly provided at the lower end of the inner side wall of the exhaust pipe 600.

[0034] Specifically, the exhaust pipe 600 is fixedly connected to the upper end of the injection pipe 200, and the exhaust pipe 600 communicates with the internal flow channel of the injection pipe 200 to collect the gas overflowing from the titanium alloy solution. A porous permeable ceramic baffle 601 is fixedly installed at the lower end of the inner wall of the exhaust pipe 600. The porous permeable ceramic baffle 601 is made of YSZ ceramic material and has multiple micropores with a pore size ranging from ten to fifty micrometers. The porous permeable ceramic baffle 601 divides the interior of the exhaust pipe 600 into upper and lower spaces. The lower space communicates with the injection pipe 200, and the upper space is used to store the gas passing through the porous permeable ceramic baffle 601.

[0035] In this optional embodiment, the gas overflowing from the titanium alloy solution rises into the exhaust pipe 600. The gas passes through the tiny pores of the porous permeable ceramic partition 601 and enters the upper storage space. The titanium alloy solution, due to its high surface tension and non-wetting nature with the YSZ ceramic, cannot penetrate the tiny pores and is blocked below the porous permeable ceramic partition 601, thus achieving a gas-liquid separation function that allows for airflow while preventing liquid penetration. The porous permeable ceramic partition 601 utilizes the high surface tension and capillary resistance of the titanium liquid to block it, allowing only gas to pass through, ensuring effective gas collection while preventing the titanium liquid from entering the upper space of the exhaust pipe 600.

[0036] like Figures 1-8 As shown, optionally, a spring 602 is fastened to the upper end of the porous breathable ceramic baffle 601, a piston plate 603 is fastened to the upper end of the spring 602, the piston plate 603 is slidably connected to the inner surface of the exhaust pipe 600, and a U-shaped rod 604 is fastened between the upper end of the metal ball 605 and the upper end of the piston plate 603, and the U-shaped rod 604 is slidably connected to the middle of the upper end of the water inlet pipe 501.

[0037] Specifically, the piston plate 603 can slide up and down along the axis of the exhaust pipe 600, and a U-shaped rod 604 is fastened between the upper end of the metal ball 605 and the upper end of the piston plate 603, so that the piston plate 603 and the metal ball 605 move synchronously.

[0038] In this optional embodiment, when the titanium alloy solution is at a high temperature and contains a large amount of gas, the amount of gas collected in the space above the porous permeable ceramic partition 601 increases, the gas pressure rises, and the piston plate 603 moves upward against the elastic force of the spring 602. The piston plate 603 drives the metal ball 605 to rise synchronously through the U-shaped rod 604, thereby increasing the flow cross section of the second conical hole 607 and increasing the coolant flow rate. When the titanium alloy solution is at a low temperature and contains a small amount of gas, the gas pressure decreases, the spring 602 pulls the piston plate 603 to return to its original position, and the metal ball 605 descends synchronously through the U-shaped rod 604, thereby decreasing the flow cross section of the second conical hole 607 and reducing the coolant flow rate.

[0039] like Figure 3 and Figure 4 As shown, optionally, the space between the upper end of the porous permeable ceramic separator 601 and the lower end of the piston plate 603 is used to store overflowing gas.

[0040] In this optional embodiment, the gas storage space between the porous permeable ceramic partition 601 and the piston plate 603 converts the collected gas pressure into a driving force to push the piston plate 603. When the gas volume increases, the gas pressure rises and drives the piston plate 603 to move, thereby adjusting the coolant flow rate through the linkage of the U-shaped rod 604 and the metal ball 605. After the injection is completed, the gas is gradually discharged, the gas pressure decreases, and the spring 602 pulls the piston plate 603 to reset.

[0041] like Figure 8 As shown, optionally, a retaining ring is fixed to the inner wall of the upper end of the exhaust pipe 600.

[0042] In this embodiment, a retaining ring is provided to prevent the piston plate 603 from slipping upward from the exhaust pipe 600.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A titanium alloy die-casting device for a piercing machine mandrel, characterized in that, include: Die-cast body (100); Injection tube (200) is used to contain the titanium alloy solution to be injected; The melting chamber (300) is connected to the injection tube (200) and is used to input the molten titanium alloy solution into the injection tube (200); A hydraulic push rod (700) is disposed inside the injection tube (200) and is used to inject the titanium alloy solution inside the injection tube (200) into the mold at a constant pressure; The first conical hole (401) is provided on the inner wall of the injection tube (200). The size of the flow cross section of the first conical hole (401) can be automatically adjusted according to the temperature of the titanium alloy solution. When the temperature rises, the flow cross section becomes smaller, and when the temperature falls, the flow cross section becomes larger. A cooling shroud (500) is fitted over the outside of the injection tube (200). Circulating coolant is introduced into the cooling shroud (500) to cool the titanium alloy solution injected from the discharge end of the first conical hole (401). An exhaust pipe (600) is provided at the discharge end of the first conical hole (401) to collect the gas overflowing from the titanium alloy solution. When the amount of gas in the exhaust pipe (600) increases or decreases, the flow cross section of the water inlet end of the cooling cover (500) becomes larger or smaller.

2. The titanium alloy die-casting equipment for the piercing machine mandrel according to claim 1, characterized in that, A ceramic block (400) is coaxially fixed to the inner wall of the injection tube (200). The first conical hole (401) is opened through the middle of the ceramic block (400). A ceramic fixing plate (405) is vertically fixed to the inner wall of the injection tube (200). A ceramic guide sleeve (404) is horizontally fixed to the side of the ceramic fixing plate (405). A graphite rod (403) is fixed to the inner bottom surface of the ceramic guide sleeve (404). The outer surface of the graphite rod (403) is in contact with the inner surface of the ceramic guide sleeve (404). A ceramic ball (402) is fixed to the end of the graphite rod (403). The ceramic ball (402) is located in the first conical hole (401).

3. The titanium alloy die-casting equipment for the piercing machine mandrel according to claim 2, characterized in that, The central axis of the ceramic ball (402) is collinear with the central axis of the first conical hole (401). The ceramic ball (402) is always located inside the first conical hole (401). The ceramic ball (402) moves back and forth along the central axis of the first conical hole (401).

4. The titanium alloy die-casting equipment for the piercing machine mandrel according to claim 1, characterized in that, The cooling cover (500) is coaxially fixed on the outer wall of the injection tube (200). The upper two sides of the cooling cover (500) are respectively fixedly connected to the water inlet pipe (501) and the water outlet pipe (503). The side wall of the water inlet pipe (501) is fixedly connected to the cold water port (502). The water inlet end of the cold water port (502) is fixedly connected to the water outlet end of the external small water chiller. The water inlet end of the small water chiller is fixedly connected to the water outlet end of the water outlet pipe (503).

5. The titanium alloy die-casting equipment for the piercing machine mandrel according to claim 4, characterized in that, A fixing block (606) is coaxially fixed at the lower end of the inner wall of the water inlet pipe (501). A through second conical hole (607) is opened in the middle of the fixing block (606). A metal ball (605) is arranged on the central axis of the second conical hole (607). The metal ball (605) moves vertically up and down along the axis to adjust the flow cross section of the second conical hole (607) to become larger or smaller. When the amount of gas in the exhaust pipe (600) increases or decreases, the metal ball (605) is driven to move vertically up or down.

6. The titanium alloy die-casting equipment for the piercing machine mandrel according to claim 5, characterized in that, The exhaust pipe (600) is fixedly connected to the upper end of the injection pipe (200), and a porous permeable ceramic baffle (601) is fixedly provided on the lower end of the inner wall of the exhaust pipe (600).

7. The titanium alloy die-casting equipment for the piercing machine mandrel according to claim 6, characterized in that, A spring (602) is fastened to the upper end of the porous breathable ceramic partition (601). A piston plate (603) is fixed to the upper end of the spring (602). The piston plate (603) is slidably connected to the inner surface of the exhaust pipe (600). A U-shaped rod (604) is fastened between the upper end of the metal ball (605) and the upper end of the piston plate (603). The U-shaped rod (604) is slidably connected to the middle of the upper end of the water inlet pipe (501).

8. The titanium alloy die-casting equipment for the piercing machine mandrel according to claim 7, characterized in that, The space between the upper end of the porous permeable ceramic partition (601) and the bottom end of the piston plate (603) is used to store the overflowing gas.

9. The titanium alloy die-casting equipment for the piercing machine mandrel according to claim 6, characterized in that, A retaining ring is fixed to the inner wall of the upper end of the exhaust pipe (600).

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