A mold for fixed core rod and floating core rod double hole forming

Abstract

The utility model discloses a kind of fixed core rod and floating core rod double-hole forming mould, including upper punch, female die, lower punch, core rod connecting rod and core rod assembly. Core rod connecting rod connects press. Core rod assembly contains fixed core rod, floating core rod, cylinder, cylinder fixed seat and core rod base. Cylinder fixed seat is fixedly connected with core rod base, and core rod base is fixedly connected with core rod connecting rod, so that fixed core rod and female die move synchronously. Two core rods are in the same horizontal plane when powder is loaded, and the length of floating core rod is higher than that of fixed core rod before assembly. Cylinder piston rod is connected with floating core rod adjusting seat. Cylinder is installed in cylinder fixed seat. Core rod base is installed with fixed core rod connecting rod and cylinder fixed seat. Cylinder allows floating core rod to be pressed down by upper punch when pressing, and drives floating core rod to rise to its top end and the top end of fixed core rod and the upper surface of female die to be flush when resetting. Realize through-hole and special countersunk hole one-time synchronous mould pressing forming, improve yield, reduce cost, adapt to small hole spacing limit, shorten product development cycle.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy forming technology, specifically to a mold for forming a double hole of a fixed core rod and a floating core rod. Background Technology

[0002] In cemented carbide products, it is often necessary to process products with double-hole structures. Traditional double-hole structures are mostly identical arc-shaped countersunk holes, flared holes, or through holes. These products are typically formed using a mold that includes an upper punch, a lower punch, a female die, and a mandrel module. The mandrel is designed to be fixed or floating depending on the product structure; however, because the nose of a floating mandrel is relatively long and can easily pull out the blank, a fixed design is more commonly used in practice. During mold operation, the top of the mandrel is usually slightly lower than the upper surface of the female die by about 1 mm to avoid interference with the filling device. During the pressing process, the upper punch descends into the female die, its hole portion enclosing the mandrel or its nose portion pressing against the mandrel, pushing the mandrel downwards synchronously to the forming position. Throughout this process, the two identical mandrels remain at the same pressing height.

[0003] However, for products with different double-hole structures, such as a combination of one through hole and the other a flared hole or an arc-shaped countersunk hole, traditional molds using double-core rods of the same structure cannot effectively press and form them. Before this invention, such special double-hole products usually required an additional semi-processing step to complete the processing of one type of hole. This step-by-step processing method not only increased the complexity of the production process but also led to a decrease in product yield and low overall processing efficiency, becoming a technical problem that urgently needed to be solved in the field of precision forming of cemented carbide products. Utility Model Content

[0004] In view of the above-mentioned technical problems in related technologies, this utility model proposes a mold for forming a fixed core rod and a floating core rod with double holes, which can overcome the above-mentioned shortcomings of the prior art.

[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: A mold for forming a fixed core rod and a floating core rod with two holes; The mold for dual-hole forming with a fixed mandrel and a floating mandrel includes an upper punch, a female mold, a lower punch, a mandrel connecting rod, and a mandrel assembly. The mandrel connecting rod is used to connect to the press. The mandrel assembly includes a fixed mandrel, a floating mandrel, a fixed mandrel cover, a fixed mandrel gasket, a floating mandrel adjusting seat, a cylinder, a cylinder fixing seat, and a mandrel base. The base of the fixed mandrel is fixedly connected to the cylinder fixing seat through the fixed mandrel cover and the fixed mandrel gasket. The base of the mandrel is movably connected to the mandrel connecting rod, allowing the fixed mandrel to engage with the female mold. Synchronous movement; the top end of the floating core rod is horizontal to the top end of the fixed core rod at the initial powder loading position; the piston rod of the cylinder is connected to the bottom end of the floating core rod through a floating core rod adjusting seat; the cylinder fixing seat is used to fix the cylinder; the core rod base is used to connect the core rod connecting rod and the cylinder fixing seat; the cylinder is used to allow the floating core rod to be pressed down by the upper punch during pressing, and to drive the floating core rod to move upward to a position where its top end is flush with the top end of the fixed core rod and the upper surface of the female mold during reset.

[0006] Furthermore, the height difference between the top length of the floating core rod and the top length of the fixed core rod is greater than the height of the blank to be pressed plus 2mm, and the tops of the fixed core rod and the floating core rod are in a horizontal position when the powder is loaded.

[0007] Furthermore, the cylinder is a mini cylinder, and its stroke is greater than the distance that the floating core rod needs to move downward during the pressing process.

[0008] Furthermore, the mini cylinder has a cylinder diameter of 10mm and an outer diameter with an external thread of M15X1.5.

[0009] Furthermore, the core rod assembly also includes a floating core rod adjusting seat, which is disposed between the bottom end of the floating core rod and the piston rod of the cylinder, for adjusting the height of the floating core rod.

[0010] Furthermore, the cylinder mounting base is provided with a fixed step hole with an internal thread M15X1.5 that is adapted to the external thread of the cylinder. The cylinder is screwed into the fixed step hole by the thread and fixed with a nut.

[0011] Furthermore, the piston rod end of the cylinder has a thread for connecting to the bottom end of the floating core rod or the floating core rod adjusting seat.

[0012] Furthermore, the core rod assembly also includes a core rod fixing cover, which is used to press and fix the base of the core rod onto the cylinder mounting seat.

[0013] Furthermore, the core rod assembly also includes a fixed core rod gasket through which the floating core rod passes. The fixed core rod gasket also serves as a capping plate for the floating core rod, thereby limiting the upward movement of the floating core rod.

[0014] Furthermore, the core rod connecting rod is used to connect the drive mechanism of the press, and can adjust the height of the core rod base and the fixed core rod so that its top end is flush with the upper surface of the female mold.

[0015] The beneficial effects of this utility model are as follows: By setting a core rod assembly consisting of a fixed core rod, a floating core rod, and a cylinder drive mechanism, the fixed core rod moves synchronously with the female mold to form a through hole. At the same time, the cylinder controls the floating core rod to move downward under pressure during pressing to form an irregular hole and to accurately return to the powder loading plane during reset. This allows for the one-time molding of double-hole structures with different hole combinations, eliminating the secondary processing required by traditional processes. This significantly improves product yield and production efficiency, and reduces the manufacturing cost of complex double-hole cemented carbide products. In addition, by using a mini cylinder in conjunction with a floating core rod height adjustment mechanism, a compact layout is achieved while ensuring sufficient floating stroke, adapting to the space constraints of products with small hole spacing. Combined with standardized cylinder selection and modular installation design, the mold development cycle is significantly shortened and equipment compatibility is enhanced. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the fixed core rod and floating core rod double hole forming of a mold according to an embodiment of the present utility model; Figure 2 This is a top view of the upper punch structure of a mold for forming a fixed core rod and a floating core rod with double holes, according to an embodiment of the present utility model; Figure 3 This is a mold for forming a fixed core rod and a floating core rod with double holes, according to an embodiment of the present invention. Figure 2 Sectional view of line AA in the middle; Figure 4 This is a schematic diagram of the core rod connecting rod of a mold for forming a fixed core rod and a floating core rod with double holes, according to an embodiment of the present utility model. Figure 5This is a top view of a cylinder fixing seat for a mold with a fixed core rod and a floating core rod forming a double hole, according to an embodiment of the present utility model. Figure 6 This is a mold for forming a fixed core rod and a floating core rod with double holes, according to an embodiment of the present invention. Figure 5 Sectional view of line AA in the middle; Figure 7 This is a perspective view of a cylinder fixing seat for a mold with a fixed core rod and a floating core rod forming double holes, according to an embodiment of the present utility model. Figure 8 This is a schematic diagram of the floating and fixed double-hole mold structure of a mold for forming a fixed core rod and a floating core rod according to an embodiment of the present utility model; In the diagram: 1. Upper punch; 101. Upper punch nose; 102. Upper punch through hole; 2. Female mold; 3. Lower punch; 4. Fixed core rod; 5. Floating core rod; 6. Fixed core rod cover; 7. Fixed core rod gasket; 8. Floating core rod adjusting seat; 9. Cylinder; 10. Cylinder fixing seat; 11. Core rod base; 12. Core rod connecting rod. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art are within the protection scope of the present utility model.

[0019] It should be understood that in the description of the embodiments of this utility model, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0020] like Figures 1-8As shown, a mold for forming a double hole of a fixed core rod and a floating core rod according to an embodiment of the present invention includes an upper punch 1, a female mold 2, a lower punch 3, a core rod connecting rod 12, and a core rod assembly. The core rod connecting rod 12 is used to connect to a press. The core rod assembly includes a fixed core rod 4, a floating core rod 5, a fixed core rod cover 6, a fixed core rod gasket 7, a floating core rod adjusting seat 8, a cylinder 9, a cylinder fixing seat 10, and a core rod base 11. The base of the fixed core rod 4 is fixedly connected to the cylinder fixing seat 10 through the fixed core rod cover 6 and the fixed core rod gasket 7. The core rod base 11 is movably connected to the core rod connecting rod 12, so that the core rod... The fixed core rod 4 can move synchronously with the female mold 2; the top end of the floating core rod 5 is horizontal to the top end of the fixed core rod 4 at the initial powder loading position; the piston rod of the cylinder 9 is connected to the bottom end of the floating core rod 5 through the floating core rod adjusting seat 8; the cylinder fixing seat 10 is used to fix the cylinder 9; the core rod base 11 is used to connect the core rod connecting rod 12 and the cylinder fixing seat 10; the cylinder 9 is used to allow the floating core rod 5 to be pressed down by the upper punch 1 during pressing, and to drive the floating core rod 5 to move upward to a position where its top end is flush with the top end of the fixed core rod 4 and the upper surface of the female mold 2 during reset.

[0021] According to an embodiment of the present invention, a mold for forming a double hole of a fixed core rod and a floating core rod is provided. In a specific embodiment, the top length of the floating core rod 5 is designed to be greater than the height difference between the top and bottom of the fixed core rod 4 and the top of the fixed core rod 4 plus 2mm. When the powder is loaded, the tops of the fixed core rod 4 and the floating core rod 5 are in a horizontal position.

[0022] According to an embodiment of the present invention, a mold for forming a fixed core rod and a floating core rod with dual holes is provided. In a specific embodiment, the cylinder 9 is a mini cylinder, and its stroke is greater than the distance that the floating core rod 5 needs to move downward during the pressing process.

[0023] According to an embodiment of the present invention, a mold for forming a fixed core rod and a floating core rod with double holes is provided. In a specific embodiment, the cylinder diameter of the mini cylinder is 10mm, and the outer diameter has an external thread M15X1.5.

[0024] According to an embodiment of the present invention, a mold for forming a fixed core rod and a floating core rod with dual holes is provided. In a specific embodiment, the core rod assembly further includes a floating core rod adjusting seat 8, which is disposed between the bottom end of the floating core rod 5 and the piston rod of the cylinder 9, and is used to adjust the height of the floating core rod 5.

[0025] According to an embodiment of the present invention, a mold for forming a fixed core rod and a floating core rod with two holes is provided. In a specific embodiment, the cylinder fixing seat 10 is provided with a fixing step hole with an internal thread M15X1.5 that is adapted to the external thread of the cylinder 9. The cylinder 9 is screwed into the fixing step hole by the thread and fixed by a nut.

[0026] According to an embodiment of the present invention, a mold for forming a fixed core rod and a floating core rod with dual holes is provided. In a specific embodiment, the piston rod end of the cylinder 9 has a thread for connecting the bottom end of the floating core rod 5 or the floating core rod adjusting seat 8.

[0027] According to an embodiment of the present invention, a mold for forming a fixed core rod and a floating core rod with dual holes is provided. In a specific embodiment, the core rod assembly further includes a fixed core rod cover 6, which is used to press and fix the base of the fixed core rod 4 onto the cylinder mounting seat 10.

[0028] According to an embodiment of the present invention, a mold for forming a fixed core rod and a floating core rod with two holes is provided. In a specific embodiment, the core rod assembly further includes a fixed core rod gasket 7, through which the floating core rod 5 passes. The fixed core rod gasket 7 also serves as a floating core rod cover to limit the upward movement stroke of the floating core rod 5.

[0029] According to an embodiment of the present invention, a mold for forming a double hole of a fixed core rod and a floating core rod is provided. In a specific embodiment, the core rod connecting rod 12 is used to connect the drive mechanism of the press and can adjust the height of the core rod base 11 and the fixed core rod 4 so that its top end is flush with the upper surface of the female mold 2.

[0030] To facilitate understanding of the above-mentioned technical solutions of this utility model, the following detailed description of the above-mentioned technical solutions of this utility model is provided through specific usage methods.

[0031] In practical use, the mold for double-hole forming of fixed and floating core rods according to this utility model includes an upper punch 1, a female mold 2, a lower punch 3, a fixed core rod 4, a floating core rod 5, a fixed core rod cover 6, a fixed core rod gasket 7, a floating core rod adjusting seat 8, a cylinder 9, a cylinder fixing seat 10, a core rod base 11, and a core rod connecting rod 12. The fixed core rod 4, floating core rod 5, fixed core rod cover 6, fixed core rod gasket 7, floating core rod adjusting seat 8, cylinder 9, cylinder fixing seat 10, and core rod base 11 constitute the core rod assembly, which is the key component of this patent. The upper punch 1 and lower punch 3 are connected to the press by four screws each through the punch pressure ring. The female mold 2 is connected to the mold frame through the female mold gasket and the pressure ring. The female mold 2 is designed according to product requirements and is heat-fitted to the alloy mold core with a suitable interference fit. The core rod connecting rod 12 is connected to the cylinder of the press.

[0032] During pressing, the female mold 2, lower punch 3, and core rod assembly return to the zero position. The floating core rod 5 is kept flush with the fixed core rod 4 and the top surface of the female mold 2 by the action of the cylinder. After the upper punch 1 is raised to the height of the material box, there is still a safe space for movement to ensure that the upper punch 1 will not interfere with the material box when it moves down during the pushing reciprocating action. After the powder is loaded, the nose part of the upper punch 1 first contacts the floating core rod 5. The piston of the cylinder 9 moves into the cylinder. After the upper punch nose is pressed to the forming position, it stays and holds pressure for a certain period of time. At this time, the fixed core rod 4 is always fitted in the inner hole of the upper punch. The fixed core rod 4 and the lower punch 3 remain stationary relative to each other. When ejecting, the female mold 2 and the core rod assembly are pulled down together. The upper punch 1 returns to the zero position after the pressure holding is completed. The action cycle ends here and the next cycle begins.

[0033] Its specific principles and structural design are as follows: (I) Molding Principle: The through holes are formed using a fixed mandrel, and the upper punch is designed as a through hole. The mandrel base is fixed and connected to the lower connecting plate of the mold frame. It is aligned with the upper surface of the female mold using a machine tool connecting screw and runs synchronously with the female mold. The flared or arc-shaped countersunk holes are formed using an upper punch nose. The upper punch design is described in [details omitted]. Figure 2 and Figure 3 The floating core rod is in contact with the upper punch nose. The upper punch nose presses the floating core rod into the inner hole of the lower punch. The floating core rod base is in contact with the cylinder alone. When resetting, the cylinder inflates and pushes the floating core rod back to its original position. The adjustable core rod base is connected to the piston shaft, which can make the top surface of the floating core rod flush with the top surface of the fixed core rod when in the powder loading state (reset state).

[0034] (II) Core rod design: Because the floating core needs to move up and down, it needs to pass through the fixed core washer (see...). Figure 8 The floating core rod is 12mm higher than the fixed core rod, and the height difference needs to be designed according to the blank height. Generally, the height difference is greater than the blank height + 2~5 (mm). For example, the MS265 series products have a maximum thickness of 4.2mm and a blank height of 5.12mm. This floating core rod design is 12mm higher than the fixed core rod, which is enough for the core rod to float up and down.

[0035] (III) Design of cylinder mounting base: The cylinder mounting bracket is used to secure the cylinder. However, since the distance between the two holes of the blade is generally small (9.3mm for the MS265 series), a miniature cylinder with a 10mm diameter and an external thread of M15X1.5 is selected to facilitate cylinder assembly and ensure the piston center is concentric with the floating mandrel center. The cylinder mounting bracket has an internal thread M15X1.5 mounting step on one side, with installation space cut at both the top and bottom. During installation, the cylinder is screwed into the threaded hole and secured with nuts at both the top and bottom. See the cylinder mounting bracket description. Figures 5-7 .

[0036] (iv) Design of cylinder parameters: 1) Cylinder stroke: It needs to be selected according to the reciprocating distance of the floating mandrel. For example, the mandrel stroke of the MS265 series is 7.5~8mm, and the cylinder stroke should be greater than 15mm.

[0037] 2) Cylinder diameter: It is related to the pressure required and should be selected according to the actual pressure needed.

[0038] 3) Cylinder piston rod: Whether or not it needs to be threaded depends on the actual needs; the MS265 series requires an additional floating core rod base, so a threaded rod is selected. 4) Connector diameter: Generally, it is a standard threaded hole; select an appropriate hole diameter. The MS265 series uses M5X0.8.

[0039] (V) Overall assembly scheme for the core rod: The core rod is assembled as a whole, and the floating core rod adjustment seat can adjust the height of the floating core rod to make it level with the upper surface of the fixed core rod. The core rod base is connected to the core rod connecting rod on the machine base, adjusting the entire core rod to be flush with the upper surface of the female mold.

[0040] According to the technical solution of the mold for forming a double hole of a fixed core rod and a floating core rod described in this utility model, it has the following advantages compared with the prior art: 1: The core rod base mechanism allows double-hole products with different hole structures to be molded using a molding process; 2: Through precise design, a mini cylinder with a stroke greater than the product compact height is selected, and the length of the floating core rod is adjusted by a floating core rod adjusting seat so that it is flush with the top of the fixed core rod when filling and resetting; 3: Determine the cylinder model based on the stroke and thrust of the mini cylinder, and design the structural dimensions of the cylinder mounting base according to the determined cylinder model, saving the cost of redeveloping the cylinder and improving production efficiency; 4: The core rod connecting rod is compatible with both new and traditional core rods as a component of the press, eliminating the need to develop new parts for the machine.

[0041] In summary, by utilizing the above-mentioned technical solution of this utility model, a core rod assembly consisting of a fixed core rod, a floating core rod, and a cylinder drive mechanism is set up. This allows the fixed core rod to move synchronously with the female mold to form a through hole. Simultaneously, the cylinder controls the floating core rod to move downward under pressure during pressing to form an irregular hole and to accurately return to the powder loading plane during reset. This enables the one-time molding of double-hole structures with different hole combinations, eliminating the secondary processing steps required by traditional processes. Consequently, the product yield and production efficiency are significantly improved, and the manufacturing cost of complex double-hole cemented carbide products is reduced. Furthermore, by using a mini cylinder in conjunction with a floating core rod height adjustment mechanism, a compact layout is achieved while ensuring sufficient floating stroke, adapting to the space constraints of products with small hole spacing. Combined with standardized cylinder selection and modular installation design, the mold development cycle is significantly shortened and equipment compatibility is enhanced.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mold for forming a double hole of a fixed core rod and a floating core rod, characterized in that, The press includes an upper punch (1), a female die (2), a lower punch (3), a core rod connecting rod (12), and a core rod assembly. The core rod connecting rod (12) is used to connect to the press. The core rod assembly includes a fixed core rod (4), a floating core rod (5), a fixed core rod cover (6), a fixed core rod gasket (7), a floating core rod adjusting seat (8), a cylinder (9), a cylinder fixing seat (10), and a core rod base (11). The base of the fixed core rod (4) is fixedly connected to the cylinder fixing seat (10) through the fixed core rod cover (6) and the fixed core rod gasket (7). The core rod base (11) is movably connected to the core rod connecting rod (12), so that the fixed core rod (4) can be connected to the female die (2). Synchronous movement; the top end of the floating core rod (5) is horizontal to the top end of the fixed core rod (4) at the initial powder loading position; the piston rod of the cylinder (9) is connected to the bottom end of the floating core rod (5) through the floating core rod adjusting seat (8); the cylinder fixing seat (10) is used to fix the cylinder (9); the core rod base (11) is used to connect the core rod connecting rod (12) and the cylinder fixing seat (10); the cylinder (9) is used to allow the floating core rod (5) to be pressed down by the upper punch (1) during pressing, and to drive the floating core rod (5) to move upward to the position where its top end is flush with the top end of the fixed core rod (4) and the upper surface of the female mold (2) during reset.

2. The mold for forming a double hole of a fixed core rod and a floating core rod according to claim 1, characterized in that, The top length of the floating core rod (5) is higher than the top height of the fixed core rod (4), which is greater than the height of the blank to be pressed plus 2mm. When the powder is loaded, the tops of the fixed core rod (4) and the floating core rod (5) are in a horizontal position.

3. The mold for forming a double hole of a fixed core rod and a floating core rod according to claim 1, characterized in that, The cylinder (9) is a mini cylinder, and its stroke is greater than the distance that the floating core rod (5) needs to move downward during the pressing process.

4. The mold for forming a double hole of a fixed core rod and a floating core rod according to claim 3, characterized in that, The mini cylinder has a cylinder diameter of 10mm and an outer diameter with an external thread of M15X1.

5.

5. The mold for forming a double hole of a fixed core rod and a floating core rod according to claim 1, characterized in that, The core rod assembly also includes a floating core rod adjusting seat (8), which is disposed between the bottom end of the floating core rod (5) and the piston rod of the cylinder (9) for adjusting the height of the floating core rod (5).

6. A mold for forming a double hole of a fixed core rod and a floating core rod according to claim 1 or 4, characterized in that, The cylinder mounting base (10) is provided with a fixed step hole with an internal thread M15X1.5 that is compatible with the external thread of the cylinder (9). The cylinder (9) is screwed into the fixed step hole by the thread and fixed with a nut.

7. A mold for forming a fixed core rod and a floating core rod with double holes according to claim 1 or 5, characterized in that, The piston rod end of the cylinder (9) has a thread for connecting the bottom end of the floating core rod (5) or the floating core rod adjusting seat (8).

8. The mold for forming a double hole of a fixed core rod and a floating core rod according to claim 1, characterized in that, The core rod assembly also includes a core rod fixing cover (6), which is used to press and fix the base of the core rod (4) onto the cylinder fixing seat (10).

9. The mold for forming a double hole of a fixed core rod and a floating core rod according to claim 1, characterized in that, The core rod assembly also includes a fixed core rod gasket (7), through which the floating core rod (5) passes. The fixed core rod gasket (7) also serves as a floating core rod cap to limit the upward movement of the floating core rod (5).

10. The mold for forming a double hole of a fixed core rod and a floating core rod according to claim 1, characterized in that, The core rod connecting rod (12) is used to connect the drive mechanism of the press and can adjust the height of the core rod base (11) and the fixed core rod (4) so ​​that its top end is flush with the upper surface of the female mold (2).

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