Sizing argon blowing flow control stopper rod and manufacturing method thereof

Abstract

The invention relates to the technical field of stopper rods, in particular to a sizing argon blowing flow control stopper rod and a manufacturing method thereof.The sizing argon blowing flow control stopper rod comprises a stopper rod body, a stopper rod head is arranged at the bottom of the stopper rod body, a gas channel is formed in the stopper rod body, and a gas outlet channel is formed in the stopper rod head; an air outlet channel is formed in the stopper rod head, an air guide pipe is arranged in the air outlet channel, at least one air guide channel is formed in the air guide pipe, the air guide channel is communicated with the air outlet channel, the upper end face of the air guide pipe is higher than the top end of the air outlet channel, and a limiting structure used for limiting the air guide pipe to move downwards is arranged in the stopper rod head; through the limiting structure, the air guide pipe is limited in the stopper rod, and the technical problem that the service life of the stopper rod is affected due to falling of the air guide pipe caused by erosion of the stopper rod is solved.

Description

Technical Field

[0001] The invention relates to the technical field of stopper rods, and in particular to a fixed-diameter argon-blowing flow-control stopper rod and a manufacturing method thereof. Background Art

[0002] With the continuous advancement of technology and the improvement of performance, the application field of argon stopper rods has gradually expanded. At present, it has been widely used in metallurgical fields such as steel, aluminum alloy, copper alloy, etc., and plays an important role in the processes of molten steel casting, molten aluminum casting and molten copper casting. In addition, with the continuous development of continuous casting technology, argon stopper rods have also been widely used in the argon blowing process of the submerged nozzle of the continuous casting crystallizer, which effectively prevents nozzle blockage and improves the quality of the casting.

[0003] Chinese patent CN104096827A discloses a porous calibrated argon blowing stopper for continuous casting, comprising a stopper body and a stopper head connected to the bottom of the stopper body, an argon channel is provided inside the stopper, an alumina gas guide tube is provided inside the stopper head, the alumina gas guide tube and the argon channel are on the same axis, the bottom of the alumina gas guide tube and the bottom of the stopper head are on the same horizontal line, and at least two gas guide holes are evenly provided on the alumina gas guide tube. Compared with the prior art, the advantages of the present invention are: the number and size of the inner holes of the porous gas guide tube in the stopper can be arbitrarily combined, so that argon bubbles of different numbers and sizes entering the water inlet can effectively remove solid impurity products of different particle sizes in molten steel.

[0004] However, in this technical solution, the stopper rod is corroded by molten steel during use, which causes the air guide tube to be easily separated from the stopper rod, resulting in the stopper rod being unable to be used normally, affecting the service life of the stopper rod and affecting normal production. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and provide a fixed-diameter argon blowing flow control stopper rod, which limits the air guide tube in the stopper rod through a limiting structure to avoid the stopper rod being corroded, causing the air guide tube to fall off, thereby affecting the service life of the stopper rod.

[0006] To achieve the above object, the present invention provides the following technical solutions: A fixed-diameter argon-blowing flow-controlled stopper rod comprises a stopper rod body, a stopper rod head is provided at the bottom of the stopper rod body, a gas channel is provided inside the stopper rod body, a gas outlet channel is provided inside the stopper rod head, a gas guide tube is provided inside the gas outlet channel, at least one gas guide channel is provided inside the gas guide tube, the gas guide channel is connected to the gas outlet channel, the upper end surface of the gas guide tube is higher than the top end of the gas outlet channel, and a limiting structure for limiting the downward movement of the gas guide tube is provided inside the stopper rod head.

[0007] As an improvement, the limiting structure is a step limiting portion, and the air guide tube is clamped at the step limiting portion.

[0008] As an improvement, the air guide tube is cylindrical or boss cylindrical.

[0009] As an improvement, the limiting structure is a conical limiting portion, the air guide tube is in a frustum shape, and the outer diameter surface of the air guide tube matches the conical limiting portion.

[0010] As an improvement, the lower end surface of the air guide pipe is higher than the bottom end of the air outlet channel.

[0011] As an improvement, the lower end surface of the air guide pipe is aligned with the bottom end of the air outlet channel.

[0012] As an improvement, the outer diameter surface of the air guide tube is provided with a plurality of positioning parts along its axial direction; the positioning parts are positioning protrusions or positioning grooves.

[0013] Another object of the present invention is to provide a method for manufacturing a fixed-diameter argon-blown flow-control stopper rod to address the deficiencies of the prior art. The air guide tube is supported during the pressing and forming process of the air guide tube and the stopper rod to avoid the problem of the air guide tube being easily broken during the pressing and forming process.

[0014] To achieve the above object, the present invention provides the following technical solutions: A method for manufacturing a fixed-diameter argon-blowing flow control plug rod, used for manufacturing a fixed-diameter argon-blowing flow control plug rod described in the above embodiment, comprises the following steps: Step 1: positioning the air guide tube, placing the air guide tube in a molding cavity formed between a molding outer mold and a molding inner mold and positioning the air guide tube, wherein a molding portion for molding a limiting structure is formed between the molding outer mold and the molding inner mold; Step 2: Pressing and molding, introducing the refractory material used to make the stopper rod body into the molding cavity, and pressing and molding the refractory material in the molding cavity; Step 3: demoulding, after demoulding, a pressed plug is obtained; Step 4: Firing, firing the stopper rod after demoulding in step 3 to obtain a finished stopper rod.

[0015] As an improvement, in step one, the molding part includes a mold core for molding the air outlet channel and an outer contour of the air duct, and the mold core extends into the air duct of the air duct to support the air duct and mold the air outlet channel at the same time.

[0016] As an improvement, in step one, the forming part includes a support member arranged inside the air guide tube and an outer contour of the air guide tube, the upper end of the support member penetrates into the air guide channel, the lower end of the support member passes through the lower end of the air guide tube and abuts against the inner wall of the forming outer mold, so as to form the air outlet channel.

[0017] As an improvement, the gasification temperature of the support member is lower than the firing temperature in step four, and the support member is gasified during the firing process.

[0018] The beneficial effects of the present invention are: (1) The present invention presses the air guide tube and the stopper rod body into an integral shape and utilizes the limiting structure to solve the problem that the air guide tube falls off due to erosion of the stopper rod during use, thereby shortening the service life of the stopper rod.

[0019] (2) The present invention improves the limiting stability of the air guide tube by providing a step limiting portion, thereby solving the problem that the air guide tube is easy to fall off during the use of the stopper rod. At the same time, multiple groups of positioning steps can be provided to achieve multi-level positioning, further improving the firmness of the air guide tube during use and preventing the problem of the air guide tube falling off due to erosion of the stopper rod head.

[0020] (3) The present invention sets the air guide tube as a conical structure, and forms a conical limiting structure between the air guide tube and the plug rod head, thereby achieving the limitation of the air guide tube. At the same time, the size of the top conical structure is increased, thereby improving the overall strength of the air guide tube and increasing the service life.

[0021] (4) The present invention arranges the lower end surface of the air guide tube higher than the bottom end of the air outlet channel, thereby preventing the stopper rod head from being corroded and affecting the service life of the air guide tube, thereby improving the service life of the air guide tube. In particular, the air guide tube is a high-strength and fragile product structure. By utilizing this arrangement, the overall service life of the stopper rod is improved.

[0022] (5) When forming the argon-blown flow control plug rod, the present invention uses a forming inner mold or a forming outer mold to fix the air guide tube, and introduces a mold core for forming the air outlet channel into the interior of the air guide tube. During the press molding process of the plug rod, the air guide tube is supported to prevent the fragile air guide tube from being crushed during the press molding process, thereby greatly improving the product molding qualification rate.

[0023] (6) When forming the argon-blown flow control stopper rod, the present invention uses a support member disposed inside the air duct to support the air duct and simultaneously form the air outlet channel. After the pressing and forming process, there is no need to demold the support member inside the air duct. During the firing process of the pressed stopper rod, the support member is gasified by high temperature, thereby improving the qualified rate of the stopper rod molding and avoiding the problem of the air duct being damaged during the demolding process.

[0024] (7) The present invention uses easily vaporized materials as support members, so that the support members can be in full contact with the inner wall of the air duct, providing good supporting force, thereby solving the problem that traditional mold support requires demolding, mold insertion and other operations, requires a large gap between the mold core and the air duct, and the mold core cannot fully support the air duct.

[0025] In summary, the present invention has the advantages of long service life, the air guide tube will not fall off, and a simple manufacturing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the installation state of the air guide tube of the present invention Figure 1 ; Figure 3 Schematic diagram of the installation state of the air guide tube of the present invention Figure 2 ; Figure 4 Schematic diagram of the installation state of the air guide tube of the present invention Figure 3 ; Figure 5 Schematic diagram of the installation state of the air guide tube of the present invention Figure 4 ; Figure 6 Schematic diagram of the installation state of the air guide tube of the present invention Figure 5 ; Figure 7 Schematic diagram of the installation state of the air guide tube of the present invention Figure 6 ; Figure 8 Schematic diagram of the stopper rod forming mold assembly of the present invention Figure 1 ; Fig. 9 Schematic diagram of the stopper rod forming mold assembly of the present invention Figure 2 ; Fig.10 Schematic diagram of the stopper rod forming mold assembly of the present invention Figure 3 ; Fig.11 It is a schematic cross-sectional view of the air guide tube of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] Embodiment 1 like Figure 1-Figure 7 , Fig.11 As shown, this embodiment provides a fixed-diameter argon-blowing flow-controlled stopper rod, comprising a stopper rod body 1, a stopper rod head 2 is provided at the bottom of the stopper rod body 1, a transition section 12 is further provided between the stopper rod head 2 and the stopper rod body 1, the transition section 12 is used to connect the stopper rod head 2 and the stopper rod body 1, a gas channel 11 is provided inside the stopper rod body 1, a gas outlet channel 21 is provided inside the stopper rod head 2, a high-temperature resistant gas guide tube 3 is provided inside the gas guide tube 3, at least one gas guide channel 31 is provided inside the gas guide tube 3, the gas guide channel 31 is communicated with the gas outlet channel 21, the upper end surface of the gas guide tube 3 is higher than the top of the gas outlet channel 21, so as to prevent impurities from accumulating in the gas channel 11 and blocking the gas outlet channel 21, and a limiting structure 22 for limiting the downward movement of the gas guide tube 3 is provided inside the stopper rod head 2.

[0030] It should be noted that the size of the air outlet channel 21 is smaller than the outer diameter of the bottom end of the air guide tube 3, thereby forming a limiting structure 22; like Fig.11 As shown, a plurality of air guide channels 31 are evenly distributed along the cross section of the air guide tube 3 . Preferably, the air guide channels 31 are arranged at the center of the air guide tube 3 , or a plurality of air guide channels 31 are evenly distributed along the circumference of the air guide tube 3 .

[0031] Preferably, the air guide tube 3 is preferably a ceramic tube or an alumina tube.

[0032] As an improvement, the limiting structure 22 is a step limiting portion, and the air guide tube 3 is clamped at the step limiting portion.

[0033] As an improvement, the air guide tube 3 is cylindrical; it should be noted that the cylindrical air guide tube 3 cooperates with the step limiter to achieve positioning of the air guide tube 3 and prevent the air guide tube 3 from falling off during use, thereby increasing the service life of the stopper rod.

[0034] As an improvement, Figure 3 , Figure 7 As shown, the outer diameter surface of the air guide tube 3 is provided with a plurality of positioning portions 32 along its axial direction; the positioning portions 32 are positioning protrusions or positioning grooves.

[0035] It should be noted that, through the design of the positioning portion 32, during the process of press-forming the stopper rod, the air guide tube 3 and the stopper rod are formed into an integral structure, and the fastening of the positioning portion improves the firmness of the air guide tube 3. At the same time, during the use of the stopper rod, when the air outlet channel 21 is corroded, the fastening of the positioning portion 32 prevents the air guide tube 3 from falling, thereby improving the service life of the stopper rod.

[0036] In this embodiment, the air guide tube 3 and the stopper rod body 1 are integrally pressed and formed, and a suitable forming method is selected according to different usage conditions and service life of customers.

[0037] Furthermore, according to different molding processes of the stopper rod, the air guide tube 3 and the stopper rod head 2 may also be integrally pressed and molded.

[0038] In addition, the present application can press-form the air guide tube 3 and the stopper rod head 2 and then connect them to the stopper rod body 1 . The stopper rod head 2 is made of high-strength material to increase the service life of the stopper rod.

[0039] Embodiment 2 like Figure 4 , Figure 5 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that: In this embodiment, the air guide tube 3 is a boss cylinder, and the boss cylinder is provided with at least one positioning step. The positioning step and the end surface of the air guide tube 3 match the step limiting portion, and the step limiting portion can be provided with multiple groups of steps with successively changing diameters. It should be noted that the air guide tube 3 is limited by multiple steps to improve the installation stability of the air guide tube 3 and to increase the service life.

[0040] Embodiment 3 like Figure 6 , Figure 7 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The differences between the third embodiment and the first embodiment are as follows: In this embodiment, the limiting structure 22 is a conical limiting portion, the outer diameter surface of the air guide tube 3 matches the conical limiting portion, and the air guide tube 3 is a frustum-shaped; it should be noted that the frustum-shaped structure is used to limit the air guide tube 3, so as to improve the strength of the conical air guide tube 3 and thus improve the service life.

[0041] Embodiment 4 like Figure 2 , Figure 3 , Figure 4 , Figure 7 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The fourth embodiment differs from the first embodiment in that: In this embodiment, the lower end surface of the air guide tube 3 is higher than the bottom end of the air outlet channel 21. Through this arrangement, after the bottom of the plug head 2 is corroded, it does not affect the normal gas outlet of the air guide tube 3 and prevents the molten steel from impacting the air guide tube 3, thereby avoiding damage to the air guide tube 3 during use.

[0042] Embodiment 5 like Figure 5 , Figure 6 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The difference between the fifth embodiment and the first embodiment is that: In this embodiment, the lower end surface of the air guide tube 3 is aligned with the bottom end of the air outlet channel 21. It should be noted that, through this arrangement, the air guide channel 31 is overlapped with the air outlet channel 21, and the high strength of the air guide tube 3 is utilized to reduce the speed of molten steel erosion, thereby increasing the service life of the stopper rod.

[0043] Embodiment 6 like Figure 8 , Fig. 9 As shown, this embodiment provides a method for manufacturing a fixed-diameter argon-blowing flow control plug rod, which is used to manufacture a fixed-diameter argon-blowing flow control plug rod as described in the above embodiment, comprising the following steps: Step 1: positioning the air guide tube 3, placing the air guide tube 3 in a molding cavity 6 formed between a molding outer mold 4 and a molding inner mold 5 and positioning the air guide tube 3, wherein a molding portion 7 for molding a limiting structure 22 is formed between the molding outer mold 4 and the molding inner mold 5; Preferably, after the airway tube 3 is connected and positioned with the inner molding mold 5 or the outer molding mold 4, the inner molding mold 5 is inserted into the outer molding mold 4 to achieve positioning and fixation of the airway tube 3; in this embodiment, the airway tube 3 is preferably connected through the inner molding mold 5, and the rigidity of the inner molding mold 5 is utilized to improve the positioning accuracy of the airway tube 3; Step 2: Pressing and molding, introducing the refractory material used to make the stopper rod body 1 into the molding cavity 6, and pressing and molding the refractory material in the molding cavity 6; it should be noted that, according to the different materials of the stopper rod body 1, a corresponding pressing and molding method is selected, such as isostatic pressing, dry pressing or extrusion molding; Step 3: demoulding. After demoulding, a pressed plug rod is obtained; the outer molding mold and the inner molding mold are removed in reverse order according to the assembly sequence, and demoulding is completed; Step 4: Firing, firing the stopper rod after demoulding in step 3 to obtain a finished stopper rod, the firing temperature is greater than 900°C, preferably 900°C-1000°C.

[0044] Preferably, in step one, the molding portion 7 includes a mold core 71 for molding the air outlet channel 21 and an outer contour of the air duct 3 , and the mold core 71 extends into the air duct 31 of the air duct 3 to support the air duct 3 and mold the air outlet channel 21 at the same time.

[0045] It should be noted that if Fig. 9 As shown, the mold core 71 for forming the air outlet channel 21 can be connected to the outer mold 4, as shown in FIG. Figure 8 As shown, the mold core 71 for forming the air outlet channel 21 can be connected to the molding inner mold 5. By passing the mold core 71 through the air guide tube 3, the air guide channel 31 and the air outlet channel 21 can be coaxial after molding. At the same time, the air guide tube is supported to avoid misalignment that affects the blowing quality and efficiency.

[0046] Embodiment 7 like Fig.10 As shown, the components identical or corresponding to those in the first embodiment are marked with the same reference numerals as those in the sixth embodiment. For the sake of simplicity, only the differences from the sixth embodiment are described below. The seventh embodiment differs from the sixth embodiment in that: In this embodiment, in the step one, the forming portion 7 includes a support member 8 arranged inside the air guide tube 3 and the outer contour of the air guide tube 3, the upper end of the support member 8 penetrates into the air guide channel 31, and may be higher than the top of the air guide channel 31, or may be inside the air guide channel 31; the lower end of the support member 8 passes through the lower end of the air guide tube 3 and abuts against the inner wall of the forming outer mold 4, so as to form the air outlet channel 21; it should be noted that, by providing the support member 8, the problem of the air guide tube 3 being easily broken during the pressing and molding process is avoided.

[0047] In addition, by providing the support member 8, not only the air guide tube 3 is supported during the pressing process, but also the air outlet channel 21 is formed by the support member 8, so that the air outlet channel 21 and the air guide channel 31 of the air guide tube 3 are coaxially connected without a seam, which facilitates the gas flow during the use of the stopper rod.

[0048] Furthermore, the gasification temperature of the support member 8 is lower than the firing temperature in step four, so that the support member 8 is gasified and disappears during the firing process, thereby solving the problem that the demoulding is unchanged due to the support of the mold core 71 and the relatively fragile air guide tube 3 is easily damaged during the demoulding process.

[0049] Preferably, the support member 8 is made of a material such as plastic or nylon, whose gasification temperature is lower than the firing temperature. The material is not limited to the above two types. Any material that can meet the requirements of support strength and easy gasification can meet the requirements of this application.

[0050] Preferably, the outer contour dimension of the support member 8 is not greater than the inner contour dimension of the air guide channel 31 , so as to achieve rapid assembly and avoid damage to the air guide tube 3 .

[0051] In this embodiment, circular structures of the air guide tube 3 and the support member 8 are preferably used. Of course, structures of other shapes, such as polygonal shapes, may also be used, and the selection can be made according to actual working conditions and customer requirements.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixed-diameter argon blowing flow control stopper rod, comprising a stopper rod body (1), a stopper rod head (2) being provided at the bottom of the stopper rod body (1), a gas channel (11) being provided inside the stopper rod body (1), a gas outlet channel (21) being provided inside the stopper rod head (2), a gas guide tube (3) being provided inside the gas outlet channel (21), at least one gas guide channel (31) being provided inside the gas guide tube (3), the gas guide channel (31) being communicated with the gas outlet channel (21), characterized in that: A limiting structure (22) for limiting the downward movement of the air guide tube (3) is provided in the stopper rod head (2).

2. The caliber argon blowing flow control plug rod according to claim 1, characterized in that: The limiting structure (22) is a step limiting portion, and the air guide tube (3) is clamped at the step limiting portion.

3. The caliber argon blowing flow control plug rod according to claim 2, characterized in that: The air guide tube (3) is cylindrical or boss cylindrical.

4. The caliber argon blowing flow control plug rod according to claim 1, characterized in that: The limiting structure (22) is a conical limiting portion, the air guide tube (3) is in the shape of a frustum, and the outer diameter surface of the air guide tube (3) matches the conical limiting portion.

5. A calibrated argon blowing flow control plug rod according to any one of claims 1 to 4, characterized in that: The lower end surface of the air guide pipe (3) is not lower than the bottom end of the air outlet channel (21).

6. A calibrated argon blowing flow control plug rod according to any one of claims 1 to 4, characterized in that: The outer diameter surface of the air guide tube (3) is provided with a plurality of positioning portions (32) along its axial direction; the positioning portions (32) are positioning protrusions or positioning grooves.

7. A method for manufacturing a fixed-diameter argon-blowing flow control plug rod, used for manufacturing a fixed-diameter argon-blowing flow control plug rod as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: positioning the air guide tube (3), placing the air guide tube (3) in a molding cavity (6) formed between a molding outer mold (4) and a molding inner mold (5) and positioning the air guide tube, wherein a molding portion (7) for molding a limiting structure (22) is formed between the molding outer mold (4) and the molding inner mold (5); Step 2: Pressing and molding, introducing the refractory material used to make the stopper rod body (1) into the molding cavity (6), and pressing and molding the refractory material in the molding cavity (6); Step 3: demoulding, after demoulding, a pressed plug is obtained; Step 4: Firing, firing the stopper rod after demoulding in step 3 to obtain a finished stopper rod.

8. The method for manufacturing a fixed-diameter argon-blowing flow control plug rod according to claim 7, characterized in that: In the step 1, the molding part (7) comprises a mold core (71) for molding the air outlet channel (21) and an outer contour of the air guide tube (3), and the mold core (71) extends into the air guide channel (31) of the air guide tube (3) to support the air guide tube (3) and simultaneously mold the air outlet channel (21).

9. The method for manufacturing a fixed-diameter argon-blowing flow control plug rod according to claim 7, characterized in that: In the step 1, the molding part (7) comprises a support member (8) arranged inside the air guide tube (3) and an outer contour of the air guide tube (3), the upper end of the support member (8) penetrates into the air guide channel (31), and the lower end of the support member (8) passes through the lower end of the air guide tube (3) and abuts against the inner wall of the molding outer mold (4), so as to mold the air outlet channel (21).

10. The method for manufacturing a fixed-diameter argon-blowing flow control plug rod according to claim 9, characterized in that: The gasification temperature of the support member (8) is lower than the firing temperature in step 4, and the support member (8) is gasified during the firing process.

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