Powder filling tool and application method thereof

Abstract

The invention relates to the technical field of powder filling tools, in particular to a powder filling tool and an application method thereof. The powder filling tool comprises a shell, a bottom plate, an opening and closing mechanism and a powder filling assembly. The powder filling assembly is arranged on the shell and comprises a column body, an inner cylinder and an outer cylinder which are coaxially arranged from inside to outside; in the opening and closing mechanism, an annular turntable is rotatably arranged in an annular cavity defined by a shell and a bottom plate; a plurality of guide holes are formed in the annular turntable; a plurality of guide grooves are formed in the bottom plate; the wide end of each blade is arranged between the annular rotating disc and the bottom plate, and the two sides of the wide end are provided with guide columns matched with the guide holes and guide protruding blocks matched with the guide grooves correspondingly. The narrow end of each blade forms a polygonal opening with adjustable opening size along the periphery of the column body; a linkage rod is arranged on the annular turntable; the driving piece is arranged on the shell, and the output end of the driving piece is connected with the linkage rod. According to the application method, the powder filling tool is adopted, and the problems of powder channeling and long process time consumption can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of powder filling tooling, and particularly relates to a powder filling tooling and an application method thereof. Background Art

[0002] Existing brake disc blanks are generally composed of a coaxial and connected inner annular brake disc and an outer annular brake disc. The brake disc blank is formed in a forming die, and the forming method adopted is as follows: First, the upper die in the forming die is opened, and the lower die is driven to descend along the female die outside it, and the core column coaxial with the lower die is driven to rise, and a forming cavity is surrounded by the female die and the core column; Subsequently, a spacer cylinder tooling is coaxially placed in the female die, and the forming cavity is divided into an inner annular cavity (i.e., between the spacer cylinder tooling and the core column) and an outer annular cavity (i.e., between the spacer cylinder tooling and the inner wall of the female die); Then, the powder for forming the inner annular brake disc is filled into the inner annular cavity, and the powder for forming the outer annular brake disc is filled into the outer annular cavity; Finally, the spacer cylinder is withdrawn, and the upper die and the lower die are driven to move towards each other to complete the powder pressing and forming operation, thereby forming a coaxial and connected inner annular brake disc and an outer annular brake disc.

[0003] However, the following problems exist in this forming method: 1) When the spacer cylinder is withdrawn, powder mixing is likely to occur between the powder in the inner annular cavity and the powder in the outer annular cavity, resulting in a non-uniform annular boundary line between the finally formed inner annular brake disc and the outer annular brake disc, making it difficult to form a uniform annular boundary line and causing poor appearance quality of the brake disc blank; 2) This forming method occupies the forming die both when filling powder into the inner annular cavity and the outer annular cavity, resulting in a long forming process time.

[0004] In summary, it is necessary to develop a powder filling tooling and an application method thereof to solve the problems existing in the prior art. Summary of the Invention

[0005] The object of the present invention is to provide a powder filling tooling and an application method thereof, and the specific technical solutions are as follows: In a first aspect, the present invention provides a powder filling tooling, including a housing, a bottom plate, an opening and closing mechanism, and a powder filling assembly; The powder filling assembly is arranged on the housing, and includes a column body, an inner cylinder, and an outer cylinder; the outer cylinder is connected to the housing, and the area corresponding to the outer cylinder on the housing is a hollow area; the inner cylinder is coaxially arranged inside the outer cylinder, and the two are connected and enclose an outer annular powder filling area; the column body is coaxially arranged inside the inner cylinder, and the two are connected and enclose an inner annular powder filling area; The bottom plate is arranged at the bottom of the shell, and the area of the bottom plate corresponding to the outer tube is a hollow area; an annular cavity for the movement of the opening and closing mechanism is left between the bottom plate and the shell; the bottom end of the column extends below the hollow area of the bottom plate and is lower than the bottom end of the inner tube; The opening and closing mechanism includes a driving member and an opening and closing assembly; the opening and closing assembly includes an annular rotating disk and a plurality of blades; the annular rotating disk is rotatably arranged in the annular cavity; guide holes equal to the number of the blades are sequentially spaced in the circumferential direction of the annular rotating disk; guide grooves equal to the number of the blades are sequentially spaced in the circumferential direction of the bottom plate; each of the blades is arranged at the bottom of the inner cylinder and the outer cylinder; the two ends of each blade in the longitudinal direction are respectively a wide end and a narrow end, the wide end of which is arranged between the annular rotating disk and the bottom plate, and a guide column adapted to the guide hole and a guide protrusion adapted to the guide groove are respectively provided on the two side surfaces of the wide end; the narrow end of each blade is arranged in a hollow area between the bottom plate and the shell, and a polygonal opening with adjustable opening size is formed along the outer circumference of the column; a linkage rod is provided on the annular rotating disk, and a through hole for the linkage rod to pass through and move is provided on the shell; the driving member is provided on the shell, and its output end is connected to the linkage rod for linkage opening and closing of each blade.

[0006] Optionally, the guide hole includes a waist-shaped hole, one end of which is arranged close to the polygonal opening in the length direction, which is the proximal end, and the other end of which is arranged away from the polygonal opening in the length direction, which is the distal end; the angle α2 between the proximal end of the guide hole and the center of the circumscribed circle of the polygonal opening and the length direction of the guide hole is 50°~80°; the angle α1 between the distal end of the guide hole and the center of the circumscribed circle of the polygonal opening and the length direction of the guide hole is 20°~50°.

[0007] Optionally, one end of the guide groove in the length direction is arranged close to the polygonal opening, which is the proximal end, and the other end in the length direction is arranged away from the polygonal opening, which is the distal end; the angle α3 between the proximal end of the guide groove and the center of the circumscribed circle of the polygonal opening and the length direction of the guide groove is 60°~80°; the angle α4 between the distal end of the guide groove and the center of the circumscribed circle of the polygonal opening and the length direction of the guide groove is 40°~60°.

[0008] Optionally, an annular boss is further provided on the outer periphery of the bottom end of the column; the narrow end of each blade is provided close to or away from the annular boss.

[0009] Optionally, a circular arc chamfer adapted to the core hole of the forming die is provided on the bottom end of the column.

[0010] Optionally, the number of the blades is 10 to 20. The more the number of the blades is, the more circular the opening formed by the narrow ends of the blades along the outer periphery of the cylinder is, which is beneficial to preventing powder leakage and making the product form a uniform and consistent annular boundary at the interface; Each of the blades includes an integrally formed triangular piece and a square piece; the end of the triangular piece away from the square piece is the narrow end, and the end of the square piece away from the triangular piece is the wide end; An arc chamfer is provided at the connection between the square piece and the triangular piece; an arc chamfer is provided at the end of the square piece away from the triangular piece.

[0011] Optionally, an activity gap is provided between the blade and the inner cylinder and between the blade and the outer cylinder; the distance of the activity gap is 0.3 to 0.5 mm.

[0012] Optionally, the driving member includes a cylinder.

[0013] In a second aspect, the present invention provides an application method of the powder filling tooling, which includes: Step S1: Start the driving member to drive the linkage rod, and then sequentially drive the annular turntable and each of the blades to make the narrow ends of the blades closely adhere to the outer periphery of the cylinder to close the bottoms of the inner cylinder and the outer cylinder; fill powder to a target height in the inner annular powder filling area and the outer annular powder filling area of the powder filling tooling respectively; vibrate the powder filling tooling during the powder filling process to ensure that the filled powder is compact; Step S2: Open the upper die of the forming die, insert the powder-filled powder filling tooling into the lower die core hole of the forming die with the bottom end of the cylinder as the positioning; start the driving member to drive the linkage rod, and then sequentially drive the annular turntable and each of the blades to gradually expand the polygonal opening formed by the narrow ends of the blades, and then gradually open the bottoms of the inner cylinder and the outer cylinder. At the same time, control the lower die of the forming die to descend along the female die coaxially arranged outside it, drive the core column coaxial with the lower die to rise along the core hole, form a negative-pressure forming cavity surrounded by the female die and the core column, and fill the powder into the forming cavity in an inhaled manner; Step S3: After the filling is completed, remove the powder filling tooling, close the upper die, and drive the upper die and the lower die to move towards each other to complete the powder pressing and forming operation for forming a formed blank product.

[0014] Optionally, the target height is 2 times the height of the formed blank product; the pressure used for the pressing and forming is 150 to 200 Mpa; The moving speed of the driving member driving the linkage rod is 20 to 100 mm / s; The descending speed of the lower die is 20 to 50 mm / s.

[0015] Applying the technical solution of the present invention has at least the following beneficial effects: A powder filling tooling and its application method provided by the present invention can not only solve the problem of powder leakage after powder filling, making the product form a uniform and consistent annular boundary line at the interface, but also solve the problem that the existing powder filling tooling fills powder completely inside the forming die, resulting in a long forming process time. Specifically, first, the present invention uses the powder filling tooling to complete the powder filling operation outside the forming die, that is, starting the driving member to drive the linkage rod, and then sequentially driving the annular turntable and each blade to make the narrow ends of each blade closely adhere to the outer circumference of the column body to close the bottoms of the inner cylinder and the outer cylinder; completing the powder filling operation in the inner annular powder filling area and the outer annular powder filling area of the powder filling tooling respectively; secondly, the present invention uses the powder filling tooling to complete the powder filling operation of the forming die inside the forming die, that is, opening the upper die of the forming die, positioning and inserting the powder-filled powder filling tooling into the lower die core hole of the forming die with the bottom end of the column body; starting the driving member to drive the linkage rod, and then sequentially driving the annular turntable and each blade to gradually expand the polygon opening surrounded by the narrow ends of each blade, and then gradually opening the bottoms of the inner cylinder and the outer cylinder. At the same time, controlling the lower die of the forming die to descend along the female die coaxially arranged outside it, driving the core column coaxial with the lower die to rise along the core hole, forming a negative pressure forming cavity surrounded by the female die and the core column, and the powder body is filled into the forming cavity in an inhaled manner under negative pressure conditions; therefore, the polygon opening formed by each blade adopted in the opening and closing assembly of the present invention always forms an approximately circular polygon opening under the driving action of the driving member and with the double guiding action of the guiding holes and guiding grooves for the blades, which is convenient for matching with the openings of the inner cylinder and the outer cylinder. Combined with negative pressure suction powder filling, when the powder body in the powder filling tooling is filled into the forming die, the powder leakage situation between the inner annular powder body and the outer annular powder body in the forming cavity is effectively solved, making the product form a uniform and consistent annular boundary line at the interface. In addition, the present invention uses the powder filling tooling to complete the powder filling operation outside the forming die and then fill the forming die, which can solve the problem that the existing powder filling tooling fills powder completely inside the forming die, resulting in a long forming process time.

[0016] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The following will refer to the drawings to further elaborate on the present invention in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a cross-sectional structural schematic diagram of a powder filling tooling in an embodiment; Figure 2 It is a schematic structural diagram of the combination of the opening and closing mechanism and the bottom plate in the embodiment; Figure 3 It is a schematic structural diagram of the combination of all blades and the bottom plate; Figure 4 It is a schematic structural diagram of the blade; Figure 5 It is the included angle between the connecting lines of the proximal end and the distal end of any guiding hole on the annular turntable and the center of the circumscribed circle of the polygonal opening and the length direction of the guiding hole; Figure 6 It is a schematic cross-sectional structural diagram of the powder filling tooling applied to the forming die; Wherein, 1. housing, 2. bottom plate, 2.1 guiding groove, 3. opening and closing mechanism, 3.1 driving part, 3.2 annular turntable, 3.2.1 guiding hole, 3.2.2 linkage rod, 3.3 blade, 3.3.1 guiding column, 3.3.2 guiding convex block, 4. powder filling component, 4.1 column body, 4.1.1 circumferential convex platform, 4.2 inner cylinder, 4.3 outer cylinder, A1 upper die, A2 lower die, A3 female die, A4 core column. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0019] Embodiment 1: Refer to Figures 1 to 5 , a powder filling tooling, including a housing 1, a bottom plate 2, an opening and closing mechanism 3 and a powder filling component 4; The powder filling component 4 is arranged on the housing 1, and includes a column body 4.1, an inner cylinder 4.2 and an outer cylinder 4.3; the outer cylinder 4.3 is connected to the housing 1, and the area corresponding to the outer cylinder 4.3 on the housing 1 is a hollow area; the inner cylinder 4.2 is coaxially arranged inside the outer cylinder 4.3, and the two are connected by a connecting plate and enclose an outer annular powder filling area; the column body 4.1 is coaxially arranged inside the inner cylinder 4.2, and the two are connected by a connecting plate and enclose an inner annular powder filling area; The bottom plate 2 is arranged at the bottom of the housing 1, and the area corresponding to the outer cylinder 4.3 on the bottom plate 2 is a hollow area; there is an annular cavity for the movement of the opening and closing mechanism 3 between the bottom plate 2 and the housing 1; the bottom end of the column body 4.1 extends below the hollow area of the bottom plate 2, and the bottom end of the column body 4.1 is lower than the bottom end of the inner cylinder 4.2, so as to completely separate the inner cylinder 4.2 into an inner annular powder filling area; The opening and closing mechanism 3 includes a driving member 3.1 (specifically a cylinder) and an opening and closing assembly; the opening and closing assembly includes an annular turntable 3.2 and a plurality of blades 3.3 (the number of blades 3.3 is 12, which is convenient for enclosing a polygon opening approximately in a circular shape); the annular turntable 3.2 is rotatably arranged in the annular cavity; in the circumferential direction of the annular turntable 3.2, guide holes 3.2.1 equal in number to the blades 3.3 are sequentially arranged at intervals; in the circumferential direction of the bottom plate 2, guide grooves 2.1 equal in number to the blades 3.3 are sequentially arranged at intervals; each of the blades 3.3 is arranged at the bottom of the inner cylinder 4.2 and the outer cylinder 4.3; at both ends of each blade 3.3 in the length direction are a wide end and a narrow end, the wide end of which is arranged between the annular turntable 3.2 and the bottom plate 2, and on both side surfaces of the wide end, a guide post 3.3.1 adapted to the guide hole 3.2.1 and a guide protrusion 3.3.2 adapted to the guide groove 2.1 are respectively provided; the narrow ends of each of the blades 3.3 are arranged in the hollow area between the bottom plate 2 and the housing 1, and enclose a polygon opening with an adjustable opening size along the outer periphery of the column body 4.1; a linkage rod 3.2.2 is arranged on the annular turntable 3.2, and a through hole for the linkage rod 3.2.2 to penetrate and move is arranged on the housing 1; the driving member 3.1 is arranged on the housing 1, and its output end is connected to the linkage rod 3.2.2, which is used to link the opening and closing of each of the blades 3.3, and can not only make the narrow ends of each of the blades 3.3 closely adhere to the outer periphery of the column body 4.1 to close the bottom of the inner cylinder 4.2 and the outer cylinder 4.3, facilitating powder filling in the powder filling tooling, but also make the polygon opening enclosed by the narrow ends of each of the blades 3.3 gradually expand, and then gradually open the bottom of the inner cylinder 4.2 and the outer cylinder 4.3 to complete the powder filling operation of the forming die.

[0020] See Figure 5 , the guide hole 3.2.1 includes an oval hole, one end of its length direction is close to the polygon opening, which is the proximal end, and the other end of its length direction is far from the polygon opening, which is the distal end; the included angle between the connection line of the proximal end of the guide hole 3.2.1 and the center of the circumscribed circle of the polygon opening and the length direction of the guide hole 3.2.1 is 65° (i.e., α2); the included angle between the connection line of the distal end of the guide hole 3.2.1 and the center of the circumscribed circle of the polygon opening and the length direction of the guide hole 3.2.1 is 40° (i.e., α1).

[0021] One end of the guiding groove 2.1 in the length direction is close to the polygonal opening, which is the proximal end, while the other end of its length direction is far from the polygonal opening, which is the distal end; the included angle α3 between the connection line of the proximal end of the guiding groove 2.1 and the center of the circumcircle of the polygonal opening and the length direction of the guiding groove 2.1 is 70°; the included angle α4 between the connection line of the distal end of the guiding groove 2.1 and the center of the circumcircle of the polygonal opening and the length direction of the guiding groove 2.1 is 50°.

[0022] The angles of the guiding holes 3.2.1 and the guiding groove 2.1 are set to facilitate the formation of an approximately circular polygonal opening by each of the blades 3.3 under the driving action of the driving member 3.1, and to ensure that there is no interference among the blades 3.3 under the driving action of the driving member 3.1. In this embodiment, the guiding holes 3.2.1 and the guiding groove 2.1 provide a dual guiding effect for the blades 3.3 to ensure that each blade 3.3 always forms an approximately circular polygonal opening under the driving action of the driving member 3.1.

[0023] See Figure 1 , a circumferential boss 4.1.1 is further provided on the outer periphery of the bottom end of the column 4.1; the narrow ends of the blades 3.3 are arranged close to or far from the circumferential boss 4.1.1; when the narrow ends of the blades 3.3 are close to and tightly attached to the circumferential boss 4.1.1, the circumferential boss 4.1.1 provides a supporting force for the narrow ends of the blades 3.3, which is convenient for improving the stability during the powder filling operation in the powder filling tooling.

[0024] See Figure 1 , an arc chamfer matching the core hole of the forming die is provided at the bottom end of the column 4.1, which is convenient for installing the powder filling tooling on the forming die.

[0025] See Figures 3 to 4 , each of the blades 3.3 includes an integrally formed triangular piece and a square piece; the end of the triangular piece far from the square piece is the narrow end, and the end of the square piece far from the triangular piece is the wide end; An arc chamfer is provided at the connection between the square piece and the triangular piece; an arc chamfer is provided at the end of the square piece far from the triangular piece. The arc chamfers are provided to ensure that there is no interference among the blades 3.3 under the driving action of the driving member 3.1.

[0026] An activity gap is provided between the blade 3.3 and the inner cylinder 4.2 and between the blade 3.3 and the outer cylinder 4.3; the spacing of the activity gap is 0.3 - 0.5 mm, which is convenient for the blades 3.3 to smoothly open and close under the driving action of the driving member 3.1, avoiding the inner cylinder 4.2 and the outer cylinder 4.3 from wearing the blades 3.3, and also preventing the powder from leaking between the inner annular powder filling area and the outer annular powder filling area.

[0027] See Figure 1 and Figure 6 , the application method of the powder filling tooling includes: Step S1: Start the driving member 3.1 to drive the linkage rod 3.2.2, and then sequentially drive the annular turntable 3.2 and each of the blades 3.3 to make the narrow ends of each of the blades 3.3 closely adhere to the outer periphery of the column 4.1 to close the bottoms of the inner cylinder 4.2 and the outer cylinder 4.3; Fill powder to the target height in the inner annular powder filling area and the outer annular powder filling area of the powder filling tooling respectively; Vibrate the powder filling tooling during the powder filling process to ensure the compactness of the filled powder body; Step S2: Open the upper mold A1 of the forming mold, and insert the powder-filled powder filling tooling into the core hole of the lower mold A2 of the forming mold with the bottom end of the column 4.1 positioned; Start the driving member 3.1 to drive the linkage rod 3.2.2, and then sequentially drive the annular turntable 3.2 and each of the blades 3.3 to gradually expand the polygon opening surrounded by the narrow ends of each of the blades 3.3, and then gradually open the bottoms of the inner cylinder 4.2 and the outer cylinder 4.3. At the same time, control the lower mold A2 of the forming mold to descend along the female mold A3 coaxially arranged outside it, and drive the core column A4 coaxial with the lower mold A2 to rise along the core hole, and form a negative pressure forming cavity surrounded by the female mold A3 and the core column A4, and the powder body is filled into the forming cavity in an inhaled manner; Step S3: After the filling is completed, remove the powder filling tooling, close the upper mold A1, and drive the upper mold A1 and the lower mold A2 to move towards each other to complete the pressing and forming operation of the powder body to form a formed blank product (such as a brake disc).

[0028] In order to form a formed blank product, the target height is 2 times the height of the formed blank product; The pressure used for the pressing and forming is 180 MPa.

[0029] In order to avoid powder leakage, the moving speed of the driving member 3.1 driving the linkage rod 3.2.2 is 50 mm / s; The descending speed of the lower mold A2 is 25 mm / s.

[0030] In order to meet the specific shape requirements of some formed blank products, it is necessary to set a shape adapted to the specific shape on the lower mold A2 and / or the upper mold A1, such as setting a gooseneck protrusion on the lower mold A2.

[0031] In this embodiment, the polygonal opening formed by each blade 3.3 in the opening and closing assembly always forms an approximately circular polygonal opening under the driving action of the driving member 3.1 and with the double guiding effect provided by the guiding hole 3.2.1 and the guiding groove 2.1, which is convenient for being adaptively arranged with the openings of the inner cylinder 4.2 and the outer cylinder 4.3. Combined with the negative pressure suction powder filling, when the powder in the powder filling tooling is filled into the forming die, the problem of powder leakage between the inner annular powder and the outer annular powder in the forming cavity is effectively solved, so that a uniform annular demarcation line is formed at the interface of the product. In addition, the present invention fills the forming die after completing the powder filling operation outside the forming die with the powder filling tooling, which can solve the problem that the existing powder filling tooling fills the powder completely inside the forming die, resulting in a long forming process time.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A powder filling tooling, characterized in that, It includes a shell, a bottom plate, an opening and closing mechanism and a powder filling component; The powder filling assembly is arranged on the shell, and includes a cylinder, an inner cylinder and an outer cylinder; the outer cylinder is connected to the shell, and the area on the shell corresponding to the outer cylinder is a hollow area; the inner cylinder is coaxially arranged in the outer cylinder, and the two are connected to form an outer annular powder filling area; the cylinder is coaxially arranged in the inner cylinder, and the two are connected to form an inner annular powder filling area; The bottom plate is arranged at the bottom of the shell, and the area of the bottom plate corresponding to the outer tube is a hollow area; an annular cavity for the movement of the opening and closing mechanism is left between the bottom plate and the shell; the bottom end of the column extends below the hollow area of the bottom plate and is lower than the bottom end of the inner tube; The opening and closing mechanism includes a driving member and an opening and closing assembly; the opening and closing assembly includes an annular turntable and a plurality of blades; the annular turntable is rotatably arranged in the annular cavity; Guide holes are sequentially arranged in the circumferential direction of the annular turntable at intervals equal to the number of the blades; guide grooves are sequentially arranged in the circumferential direction of the bottom plate at intervals equal to the number of the blades; each of the blades is arranged at the bottom of the inner cylinder and the outer cylinder; the two ends of each blade in the length direction are respectively a wide end and a narrow end, the wide end of which is arranged between the annular turntable and the bottom plate, and guide columns adapted to the guide holes and guide protrusions adapted to the guide grooves are respectively provided on the two side surfaces of the wide end; the narrow end of each blade is arranged in the hollow area between the bottom plate and the shell, and forms a polygonal opening with adjustable opening size along the outer circumference of the column; A linkage rod is provided on the annular turntable, and a through hole for the linkage rod to penetrate and move is provided on the shell; the driving member is provided on the shell, and its output end is connected to the linkage rod for linking the opening and closing of each blade.

2. The powder filling tooling according to claim 1, wherein The guide hole includes a waist-shaped hole, one end of which is close to the polygonal opening in the length direction, which is the proximal end, and the other end of which is far away from the polygonal opening in the length direction, which is the distal end; the angle α2 between the line connecting the proximal end of the guide hole and the center of the circumscribed circle of the polygonal opening and the length direction of the guide hole is 50°~80°; the angle α1 between the line connecting the distal end of the guide hole and the center of the circumscribed circle of the polygonal opening and the length direction of the guide hole is 20°~50°.

3. The powder filling tooling according to claim 1, characterized in that, One end of the guide groove in the length direction is arranged close to the polygonal opening, which is the proximal end, and the other end of the guide groove in the length direction is arranged away from the polygonal opening, which is the distal end; the angle α3 between the line connecting the proximal end of the guide groove and the center of the circumscribed circle of the polygonal opening and the length direction of the guide groove is 60°~80°; the angle α4 between the line connecting the distal end of the guide groove and the center of the circumscribed circle of the polygonal opening and the length direction of the guide groove is 40°~60°.

4. The powder filling tooling according to claim 1, characterized in that, An annular boss is also provided on the outer periphery of the bottom end of the column; the narrow end of each blade is arranged close to or away from the annular boss.

5. The powder filling tooling according to claim 1, characterized in that A circular arc chamfer matched with the core hole of the forming die is provided on the bottom end of the column.

6. The powder filling tooling according to claim 1, characterized in that, The number of the blades is 10 to 20; Each of the blades includes an integrally formed triangular piece and a square piece; the end of the triangular piece away from the square piece is the narrow end, and the end of the square piece away from the triangular piece is the wide end; An arc chamfer is provided at the connection between the square piece and the triangular piece; an arc chamfer is provided at the end of the square piece away from the triangular piece.

7. The powder filling tooling according to claim 1, wherein, An active gap is provided between the blade and the inner cylinder and between the blade and the outer cylinder; the spacing of the active gap is 0.3 to 0.5 mm.

8. The powder filling tooling according to claim 1, characterized in that, The driving member includes a cylinder.

9. A method for applying the powder filling tooling according to any one of claims 1 to 8, characterized in that, Including: Step S1: Start the driving member to drive the linkage rod, and then sequentially drive the annular turntable and each of the blades to make the narrow ends of each of the blades closely adhere to the outer circumference of the column to close the bottoms of the inner cylinder and the outer cylinder; Fill powder to the target height in the inner annular powder filling area and the outer annular powder filling area of the powder filling tooling respectively; vibrate the powder filling tooling during the powder filling process to ensure the compactness of the filled powder; Step S2: Open the upper mold of the forming mold, and insert the powder-filled powder filling tooling into the core hole of the lower mold of the forming mold with the bottom end of the column as the positioning; Start the driving member to drive the linkage rod, and then sequentially drive the annular turntable and each of the blades to gradually expand the polygon opening surrounded by the narrow ends of each of the blades, and then gradually open the bottoms of the inner cylinder and the outer cylinder. At the same time, control the lower mold of the forming mold to descend along the female mold coaxially arranged outside it, and drive the core column coaxially arranged with the lower mold to rise along the core hole, so as to form a negative-pressure forming cavity surrounded by the female mold and the core column, and the powder is filled into the forming cavity in an inhalation manner; Step S3: After the filling is completed, remove the powder filling tooling, close the upper mold, and drive the upper mold and the lower mold to move towards each other to complete the pressing and forming operation of the powder to form a formed blank product.

10. The application method of the powder filling tooling according to claim 9, characterized in that, The target height is 1.5 to 2 times the height of the formed blank product; the pressure used for the pressing and forming is 150 to 200 Mpa; The moving speed of the driving member driving the linkage rod is 20 to 100 mm / s; The descending speed of the lower mold is 20 to 50 mm / s.

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