A double-sided pressure mold and cold pressing machine for superhard metal products

Abstract

This invention proposes a double-sided pressure mold for superhard metal products, solving the problem of uneven density in the blank caused by single-sided pressure. The double-sided pressure mold includes a core, with an upper pressure ring and a lower pressure ring fitted around its outer side. A forming cavity is formed between the upper and lower pressure rings. A mold frame is fitted around the outer side of the upper and lower pressure rings. Springs are evenly distributed circumferentially at the lower end of the mold frame, with the lower ends of the springs extending out of the mold frame and flush with the bottom of the lower pressure ring. This invention achieves double-sided pressure, improving the quality of blank forming and the yield rate.

Description

Technical Field

[0001] This utility model relates to the field of pressure mold technology, and in particular to a double-sided pressure mold and cold pressing machine for ultra-hard metal products. Background Technology

[0002] Metal superhard products can be classified into hot pressing and cold pressing according to their forming processes. Cold pressing requires placing powder in a mold and then pressing it on a hydraulic press to form a blank with a certain strength. The density and porosity of the blank are the two most basic quality control indicators. From both performance and usage perspectives, uniform density and porosity throughout the blank are fundamental requirements. Current hydraulic press systems are mostly single-sided pressing, making it difficult to overcome the inconsistency in density along the height of the blank in the pressing direction. This results in poor product quality stability and unsatisfactory performance. Furthermore, the narrow forming cavity of the mold hinders the rapid loading of the powder into the cavity, affecting the efficiency of cold pressing. Utility Model Content

[0003] This utility model proposes a double-sided pressure mold and cold pressing machine for superhard metal products, which solves the problem of uneven density of the blank caused by single-sided pressure.

[0004] The technical solution of this utility model is implemented as follows: a double-sided pressure mold for metal superhard products includes a core, an upper pressure ring and a lower pressure ring are fitted on the outer side of the core, a forming cavity is formed between the upper pressure ring and the lower pressure ring, a mold frame is fitted on the outer side of the upper pressure ring and the lower pressure ring, and springs are evenly distributed along the circumference at the lower end of the mold frame, with the lower end of the springs extending out of the mold frame and flush with the bottom of the lower pressure ring.

[0005] Furthermore, the upper part of the core is lower than the mold frame, the top of the core is a conical protrusion, and the bottom of the core is provided with a multi-faceted groove, which is connected to the vertical lifting drive motor.

[0006] Furthermore, the length of the spring extending out of the annular groove is 2-5mm.

[0007] Furthermore, the lower end of the mold frame is evenly distributed with annular grooves along the circumference, the upper end of the spring is placed in the annular groove, and the lower end extends out of the annular groove.

[0008] Furthermore, vertical grooves are evenly distributed around the lower end of the mold frame, and vertical guide posts are provided in the vertical grooves. An annular groove is formed between the vertical guide posts and the vertical grooves. The upper end of the spring is placed in the annular groove and is fitted onto the vertical guide posts.

[0009] Furthermore, the number of springs is three or more.

[0010] A cold pressing forming machine includes the aforementioned double-sided pressure mold.

[0011] Furthermore, it also includes a frame, on which an operating platform is fixed, and above the operating platform is a vertically lifting pressure head. The operating platform has a through hole, and the drive motor is located below the through hole.

[0012] The beneficial effects of this utility model are:

[0013] This invention utilizes the cooperation of a spring and a mold frame to keep the mold frame in a floating state. During the process of cold pressing powder into a blank, the blank formed by powder compression is driven by friction to move the mold frame downward, thereby causing the mold frame to be displaced relative to the lower pressure ring, thus achieving the purpose of double-sided pressure, improving the quality of blank forming and the yield.

[0014] The top of the core of this utility model is a conical protrusion, and the bottom of the core is provided with a polyhedral groove. The polyhedral groove is connected to a vertical lifting drive motor. Through the cooperation of the drive motor and the polyhedral groove, the mold is rotated circumferentially, so that under the action of centrifugal force, the powder enters the molding cavity quickly and evenly, thereby improving the processing efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0016] Figure 1 Front view of a double-sided pressure mold;

[0017] Figure 2 for Figure 1 Top view;

[0018] Figure 3 for Figure 1 A bottom view;

[0019] Figure 4 for Figure 2 Sectional view of AA;

[0020] Figure 5 This is a schematic diagram of the double-sided pressure mold in Example 2;

[0021] Figure 6 This is a schematic diagram of a cold pressing machine.

[0022] Core 1, upper pressure ring 2, lower pressure ring 3, forming cavity 4, mold frame 5, vertical guide post 6, annular groove 7, spring 8, conical protrusion 9, polyhedral groove 10, drive motor 11, first hydraulic cylinder 12, operating platform 13, pressure head 14, second hydraulic cylinder 15, through hole 16. Detailed Implementation

[0023] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] like Figure 1-4 As shown, a double-sided pressure mold for a metal superhard product includes a core 1, an upper pressure ring 2 and a lower pressure ring 3 are fitted on the outer side of the core 1, a forming cavity 4 is formed between the upper pressure ring 2 and the lower pressure ring 3, a mold frame 5 is fitted on the outer side of the upper pressure ring 2 and the lower pressure ring 3, the outer diameter of the upper pressure ring 2 and the lower pressure ring 3 matches the inner diameter of the mold frame 5, and the inner diameter of the upper pressure ring 2 and the lower pressure ring 3 matches the outer diameter of the core 1.

[0026] The lower end of the mold frame 5 has vertical grooves evenly distributed along the circumference. Vertical guide posts 6 are set in the vertical grooves. The vertical guide posts 6 and the mold frame 5 are an integral structure. An annular groove 7 is formed between the vertical guide posts 6 and the vertical grooves. The upper end of the spring 8 is placed in the annular groove 7 and is fitted on the vertical guide post 6. The lower end of the spring 8 extends out of the annular groove 7. The length of the spring 8 extending out of the annular groove 7 is 2-5mm. For example, the length is 2mm. The specific length can be adjusted according to the pressing pressure. There are more than 3 springs. For example, there are 4 springs. The bottom of the lower pressure ring 3 is flush with the lower end of the spring 8.

[0027] The method of using the double-sided pressure mold is as follows: the mold frame 5 is floated on the operating platform 13 of the cold pressing machine by the spring 8. The powder required for preparing metal superhard products is added into the molding cavity 4. During the downward pressing process of the upper pressure ring 2, the blank formed by the powder is driven to move the mold frame 5 downward due to friction, causing the mold frame 5 to be displaced relative to the lower pressure ring 3, thus achieving the effect of double-sided pressure.

[0028] Example 2

[0029] This embodiment is basically the same as Embodiment 1, except that: Figure 5 As shown, the upper end of the core 1 is lower than the mold frame 5. The top of the core 1 is a conical protrusion 9. The bottom of the core 1 is provided with a coaxial polyhedral groove 10. The polyhedral groove 10 is connected to the vertical lifting drive motor 11. The drive motor 11 is connected to the vertical first hydraulic cylinder 12, and the vertical lifting movement is performed through the first hydraulic cylinder 12.

[0030] Assemble the core 1, the lower pressure ring 3, and the mold frame 5 together. Insert the polyhedral groove 10 into the output end of the drive motor 11. Then, add the powder required for preparing the metal superhard product onto the conical protrusion 9 of the core 1. The drive motor 11 drives the mold to rotate circumferentially. The powder enters the molding cavity 4 due to centrifugal force. The drive motor 11 moves down and separates from the polyhedral groove 10. Finally, the upper pressure ring 2 moves down to press.

[0031] Example 3

[0032] like Figure 6 As shown, a cold pressing molding machine includes an operating platform 13. A vertically lifting pressure head 14 is arranged above the operating platform 13. The pressure head 14 is fixedly connected to a second hydraulic cylinder 15. The second hydraulic cylinder 15 drives the pressure head 14 to move vertically up and down. When the pressure head 14 moves down, it pushes the upper pressure ring 2 to move down.

[0033] The operating platform 13 is provided with a through hole 16. The drive motor 11 and the first hydraulic cylinder 12 are located below the through hole 16. The first hydraulic cylinder 12 drives the drive motor 11 to move upward. The output end of the drive motor 11 passes through the through hole 16. The double-sided pressure mold described in Embodiment 2 is placed on the operating platform 13. The polyhedral groove 10 is inserted into the output end of the drive motor 11. The first hydraulic cylinder 12 drives the drive motor 11 to move downward. The output end of the drive motor 11 moves to below the through hole 16, and the polyhedral groove 10 separates from the drive motor 11.

[0034] 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 dual-sided press for metal super-hard articles, characterized by: It includes a core, with an upper pressure ring and a lower pressure ring fitted on the outside of the core. The upper pressure ring and the lower pressure ring form a molding cavity. A mold frame is fitted on the outside of the upper pressure ring and the lower pressure ring. Springs are evenly distributed around the lower end of the mold frame. The lower ends of the springs extend out of the mold frame and are flush with the bottom of the lower pressure ring.

2. The double-sided press mold according to claim 1, characterized by: The upper part of the core is lower than the mold frame. The top of the core is a conical protrusion, and the bottom of the core is provided with a multi-faceted groove, which is connected to the vertical lifting drive motor.

3. The double-sided press mold according to claim 1 or 2, characterized by: The length of the spring extending out of the annular groove is 2-5mm.

4. The double-faced pressurized mold according to claim 1, characterized by: The lower end of the mold frame has annular grooves evenly distributed around its circumference. The upper end of the spring is placed inside the annular groove, and the lower end extends out of the annular groove.

5. The double-sided press mold according to claim 4, characterized by: The lower end of the mold frame has vertical grooves evenly distributed along the circumference. Vertical guide posts are set in the vertical grooves, and an annular groove is formed between the vertical guide posts and the vertical grooves. The upper end of the spring is placed in the annular groove and is fitted on the vertical guide posts.

6. The double-sided press mold according to claim 1, 4 or 5, characterized by: The number of springs is three or more.

7. A cold press forming machine characterized by: Includes the double-sided pressure mold as described in any one of claims 1-6.

8. A cold press forming machine according to claim 7, characterized in that: It also includes a frame, on which an operating platform is fixed. A vertically lifting pressure head is installed above the operating platform. A through hole is provided on the operating platform, and the drive motor is located below the through hole.

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