Bidirectional powder pressing machine capable of achieving floating demolding

Abstract

The utility model relates to the technical field of hydraulic machines, in particular to a bidirectional powder pressing machine capable of achieving floating demolding. Comprising a hydraulic machine, a floating demolding pressing mechanism is arranged in the hydraulic machine, the hydraulic machine is integrally fixed to a base support, the floating demolding pressing mechanism comprises a floating plate, a lower ejection cylinder, a floating cylinder and a core pulling cylinder, the lower end of the telescopic end of the floating cylinder is connected with a floating cylinder lengthening rod, and the lower end of the floating cylinder lengthening rod is connected with the floating plate; the floating plate is arranged in the hydraulic machine in an up-down sliding mode, the lower ejection cylinders are fixed to the two sides of the lower beam, the telescopic ends of the lower ejection cylinders are connected with lower punching ejection plates, the core-pulling cylinder is fixed to the middle of the lower beam, and the telescopic end of the core-pulling cylinder is connected with a core-pulling rod. According to the bidirectional powder pressing machine capable of achieving floating demolding, floating demolding can be conducted on a product after bidirectional pressing is conducted, the advantage that the density uniformity of the powder product obtained after bidirectional pressing is good is guaranteed, and the defect that a bidirectional powder pressing machine cannot achieve floating demolding is overcome.

Description

A floating demolding bidirectional powder press Technical Field

[0001] This utility model relates to the field of hydraulic press technology, and in particular to a bidirectional powder press with floating demolding capability. Background Technology

[0002] The main function of a powder press is to press powder materials into the required shapes and sizes under high pressure. By precisely controlling pressure, speed, and time, a powder press can ensure the density uniformity and dimensional accuracy of the pressed parts, thereby meeting the quality requirements of different products. However, if effective demolding is not adequately considered after product molding, defects such as cracking, delamination, edge chipping, and corner chipping can easily occur in the pressed parts, reducing the product yield and potentially damaging the mold, increasing mold maintenance costs. Existing powder presses generally employ two demolding methods: floating demolding and ejection demolding. Floating demolding is usually accompanied by floating pressing, where the lower die cannot move, resulting in lower density uniformity compared to bidirectional pressing. Bidirectional pressing powder presses do not have a floating function; demolding relies on the ejection of the lower die. However, ejection demolding requires high parallelism and perpendicularity of the mold, which can easily lead to unevenness, causing product cracking or even mold damage during demolding.

[0003] To address this issue, this invention proposes a floating demolding bidirectional pressing powder press, which allows the product to float and demold after being bidirectionally pressed. This not only ensures the uniformity of powder product density but also solves the problem of the inability of bidirectional powder presses to float and demold. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing an adjustable mechanical limit device suitable for powder presses.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A floating demolding bidirectional powder press includes a hydraulic press assembled from an upper crossbeam, a slider, a lower crossbeam, a column, and a main cylinder. The hydraulic press is characterized by a floating demolding pressing mechanism inside. The entire hydraulic press is fixed to a base support. The floating demolding pressing mechanism includes a floating plate, a lower top cylinder, a floating cylinder, and a core-pulling cylinder. The lower end of the telescopic end of the floating cylinder is connected to a floating cylinder extension rod, and the lower end of the extension rod is connected to the floating plate. The floating plate slides up and down inside the hydraulic press. The lower top cylinder is fixed to both sides of the lower crossbeam, and its telescopic end is connected to a lower punch plate. The core-pulling cylinder is fixed to the middle of the lower crossbeam, and its telescopic end is connected to a core-pulling rod.

[0007] Furthermore, the lower surface of the slider is connected to the upper template, and the lower surface of the upper template is connected to the upper punch.

[0008] Furthermore, guide posts are provided at the four corners of the floating plate, the upper ends of the guide posts are fixedly connected to the lower plate of the upper template, and lower guide posts are provided on the lower plate of the floating plate, with the lower guide posts located inside the guide posts in the longitudinal direction of the floating plate.

[0009] Furthermore, a slot for installing a female mold is provided in the middle of the floating plate. A lower die punch is slidably connected inside the female mold. The lower end of the lower die punch is fixed to the top plate of the lower die punch. A core-pulling rod is slidably connected inside the female mold and the lower die punch. A powder forming cavity is formed between the female mold, the lower die punch and the core-pulling rod. The powder forming cavity corresponds to the position of the upper die punch. The space between the slot and the female mold forms a heating cavity.

[0010] Furthermore, the four sets of floating plate lower guide pillars penetrate the lower punch plate, and the lower ends of the four sets of floating plate lower guide pillars are also penetrated by core-pulling plates, which are fixed to the upper end of the core-pulling cylinder.

[0011] Furthermore, fixed support plates for the lower punch plate are provided on both sides of the lower punch plate and between the lower crossbeam.

[0012] Furthermore, the floating plate slides up and down on the guide post on the floating plate, and the downward-striking top plate slides up and down on the guide post on the lower part of the floating plate.

[0013] Furthermore, a limit device is fixed on the surface of the lower impact plate to limit the downward position of the floating plate.

[0014] Compared with existing technologies, the floating demolding bidirectional powder press provided by this utility model adopts a simple mechanical structure, and its advantages are as follows:

[0015] 1. It can be pressed in both directions, resulting in better product molding effect, improving equipment utilization efficiency, product density uniformity, product qualification rate, and reducing the risk of mold damage;

[0016] 2. Floating demolding is possible. A floating cylinder can be used to drive a floating plate for demolding, or a lower ejector cylinder can be used to drive a lower ejector plate to push upwards. Both methods can expose the molded product. The demolding method can be selected based on different products.

[0017] 3. The structure is simple, easy to disassemble, install and maintain, reducing operation and maintenance costs and improving equipment availability. Attached Figure Description

[0018] Figure 1 is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 is a front view of this utility model;

[0020] Figure 3 is a partial cross-sectional view of the present invention;

[0021] Figure 4 is an enlarged view of part A in Figure 3;

[0022] 1. Hydraulic press; 10. Base support; 11. Upper crossbeam; 12. Slider; 13. Lower crossbeam; 14. Column; 15. Main cylinder; 20. Floating plate; 201. Upper guide post of floating plate; 202. Lower guide post of floating plate; 21. Lower punch plate; 22. Lower top cylinder; 23. Floating cylinder; 231. Extended rod of floating cylinder; 24. Core pulling cylinder; 25. Powder molding cavity; 251. Lower die punch; 252. Upper die punch; 26. Core pulling rod; 27. Core pulling plate; 28. Heating cavity; 29. ​​Lower punch plate fixing support plate; 3. Hydraulic station; 4. Electrical control cabinet. 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] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 this utility model.

[0025] Example 1, referring to Figures 1-4, describes a floating demolding bidirectional powder press, comprising a hydraulic press 1 assembled from an upper crossbeam 11, a slider 12, a lower crossbeam 13, a column 14, and a main cylinder 15. The hydraulic press 1 has a floating demolding pressing mechanism inside. The hydraulic press 1 is fixed to a base support 10. The floating demolding pressing mechanism includes a floating plate 20, a lower top cylinder 22, a floating cylinder 23, and a core-pulling cylinder 24. The lower end of the telescopic end of the floating cylinder 23 is connected to a floating cylinder extension rod 231, and the lower end of the floating cylinder extension rod 231 is connected to the floating plate 20. The floating plate 20 slides vertically inside the hydraulic press 1. The lower top cylinder 22 is fixed to both sides of the lower crossbeam 13, and its telescopic end is connected to a lower punch plate 21. The core-pulling cylinder 24 is fixed to the middle of the lower crossbeam 13, and its telescopic end is connected to a core-pulling rod 26. The upper end of the main cylinder 15 is fixedly connected to the upper crossbeam 11 via a flange, and the lower end of the telescopic end of the main cylinder 15 is fixedly connected to the upper plane of the slider 12 via a flange. The lower ends of the core-pulling cylinder 24 and the lower top cylinder 22 both rest within the base bracket, and the upper ends of the core-pulling cylinder 24 and the lower top cylinder 22 are respectively fixedly connected to the lower crossbeam 13 via flanges.

[0026] On the side of the hydraulic press 1, there is also a hydraulic station 3 and an electrical control cabinet 4. The hydraulic station 3 supplies oil to the main cylinder 15, the lower cylinder 22, the floating cylinder 23, and the core-pulling cylinder 24 respectively. The electrical control cabinet 4 controls each hydraulic component in the hydraulic system, thereby changing the working state of the main cylinder 15, the lower cylinder 22, the floating cylinder 23, and the core-pulling cylinder 24.

[0027] With the above scheme, the main cylinder 15 drives the slider 12 to press down, and the lower top cylinder 22 drives the lower punch plate 21 to press up, thus achieving bidirectional pressing. The floating plate 20 slides up and down inside the hydraulic press 1, thus achieving floating demolding.

[0028] Example 2, continuing to refer to Figures 1-3, in order to guide the floating plate 20 when it moves up and down, floating plate guide posts 201 are provided at the four corners of the upper plate surface of the floating plate 20, and floating plate lower guide posts 202 are provided on the lower plate surface of the floating plate 20. The floating plate lower guide posts 202 are located inside the floating plate guide posts 201 in the longitudinal direction.

[0029] The lower plate of slider 12 is connected to the upper template, and the lower plate of the upper template is connected to the upper die punch 252.

[0030] There are four sets of guide posts 201 on the floating plate. The upper end of the guide post 201 on the floating plate is fixedly connected to the lower plate of the upper template through the pressure cap. At the four corners of the floating plate 20 where the guide post 201 on the floating plate passes through, there are floating plate guide sleeves fixedly connected at the top and bottom so that the floating plate 20 can slide smoothly up and down on the outer surface of the guide post 201 on the floating plate. There are also four sets of lower guide posts 202 on the floating plate. The upper end of the lower guide post 202 on the floating plate is fixedly connected to the lower plate of the floating plate 20 through the pressure cap.

[0031] A slot for mounting a female mold is provided in the middle of the floating plate 20. A lower die punch 251 is slidably connected inside the female mold. The lower end of the lower die punch 251 is fixed to the lower die top plate 21. A core-pulling rod 26 is slidably connected inside the female mold and the lower die punch 251. A powder forming cavity 25 is formed between the female mold, the lower die punch 251, and the core-pulling rod 26. The powder forming cavity 25 corresponds to the position of the upper die punch 252. The space between the slot and the female mold forms a heating cavity 28. A heating module is provided in the heating cavity 28. The heating module is controlled by the electrical control cabinet 4 and adopts an electric heating method.

[0032] When the lower die punch 251 and the core-pulling rod 26 move, they can penetrate the entire floating plate 20. The floating plate 20 covers the top of the slot through the female die cover. The upper surface of the female die cover is level with the upper surface of the floating plate 20. When the core-pulling rod 26 and the top of the female die are in the initial position, they are level with the upper surface of the floating plate cover. When the floating cylinder 23 pushes the floating plate 20 downward, the female die moves downward with the floating plate 20, which will expose the pressed product. At this time, the product can be taken out.

[0033] In Example 3, in order to limit the downward movement of the floating plate 20, a limit device is fixed on the upper surface of the lower impact plate 21. When it moves to the set position, it can prevent the floating plate 20 from continuing to move downward.

[0034] In Example 4, four sets of floating plate lower guide posts 202 penetrate the lower punch plate 21, and the lower ends of the four sets of floating plate lower guide posts 202 are also penetrated by core-pulling plates 27, which are fixed to the upper end of the core-pulling cylinder 24. Core-pulling plate guide sleeves are fixed at the points where the floating plate lower guide posts 202 penetrate the core-pulling plate 27, allowing the four sets of floating plate lower guide posts 202 to slide more smoothly on the four corners of the core-pulling plate 27, and also providing better guidance for the four sets of floating plate lower guide posts 202.

[0035] In Example 5, in order to provide stronger support for the core-pulling plate 27, a bottom punch plate fixing support plate 29 is provided on both sides of the bottom punch plate 21 and between the bottom crossbeam.

[0036] In the entire device, the floating plate 20 slides up and down on the guide post 201 on the floating plate, and the lower punch plate 21 slides up and down on the lower guide post 202 of the floating plate. After bidirectional pressing, floating demolding can be performed by controlling the floating plate 20 through the floating cylinder 23.

[0037] The working principle of this utility model is as follows: First, install all the components, fill the material to be pressed manually or with a feeding mechanism, and put it into the powder forming cavity 25. Start the control system in the electrical control cabinet 4, and at the same time, the heating module heats the powder inside the female mold from outside the female mold. After preheating to a certain temperature, the powder is pressed.

[0038] First, in the pressing process, the main cylinder 15 carries the slider 12 and the upper die punch 252 downwards and presses them down. When the upper die punch 252 enters the female die, the lower ejector cylinder 22 drives the lower punch plate 21 and the lower die punch 251 to press upwards at the same pressing speed and pressure until the product is formed.

[0039] Second, in the demolding process, after pressing is completed, the main cylinder 15 drives the slider 12 and the upper die punch 252 to move upward out of the female mold and return to the original position; then the floating cylinder 23 continues to move downward with the floating plate 20 and the female mold. Because the lower die punch 251 has not retracted, the molded product is in a stationary state, but there is relative movement between the molded product and the female mold until the upper part of the female mold and the lower part of the molded product are level. At this time, the floating cylinder 23 stops moving downward, and the demolding of the female mold is completed. Then the core-pulling cylinder 24 pulls the core-pulling rod 26 downward until the upper part of the core-pulling rod 26 is level with the lower part of the molded product. At this time, the core-pulling cylinder 24 stops moving. The product is now completely exposed above the floating plate 20. Finally, the product is removed manually or by the pushing mechanism, or by the robot, to complete the demolding process. Another demolding method involves using the lower ejector cylinder 22 to push the lower ejector plate 21 upwards. Since the lower die punch 251 and the lower ejector plate 21 are fixedly connected, the lower ejector plate 21 will drive the lower die punch 251 to move upwards. The lower die punch 251 will then move the molded product away from the female mold, allowing the molded product to be removed. Of course, the choice of demolding method depends on the specific product being pressed.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A floating, demolding, bidirectional powder press, comprising a hydraulic press (1) assembled from an upper crossbeam (11), a slider (12), a lower crossbeam (13), a column (14), and a main cylinder (15), characterized in that, The hydraulic press (1) is equipped with a floating demolding pressing mechanism. The hydraulic press (1) is fixed on the base support (10). The floating demolding pressing mechanism includes a floating plate (20), a lower top cylinder (22), a floating cylinder (23), and a core-pulling cylinder (24). The lower end of the telescopic end of the floating cylinder (23) is connected to a floating cylinder extension rod (231). The lower end of the floating cylinder extension rod (231) is connected to the floating plate (20). The floating plate (20) slides up and down inside the hydraulic press (1). The lower top cylinder (22) is fixed on both sides of the lower crossbeam (13). The telescopic end of the lower top cylinder (22) is connected to a lower punch plate (21). The core-pulling cylinder (24) is fixed in the middle of the lower crossbeam (13). The telescopic end of the core-pulling cylinder (24) is connected to a core-pulling rod (26).

2. The floating demolding bidirectional powder press according to claim 1, characterized in that: The lower plate of the slider (12) is connected to the upper template, and the lower plate of the upper template is connected to the upper punch (252).

3. The floating demolding bidirectional powder press according to claim 1, characterized in that: The upper plate of the floating plate (20) is provided with upper guide posts (201) at the four corners of the upper plate. The upper end of the upper guide post (201) is fixedly connected to the lower plate of the upper template. The lower plate of the floating plate (20) is provided with lower guide posts (202). The lower guide posts (202) are located inside the upper guide post (201) in the longitudinal direction.

4. A floating demolding bidirectional powder press according to claim 3, characterized in that: The floating plate (20) has a slot for installing the female mold in the middle. The lower die punch (251) is slidably connected inside the female mold. The lower end of the lower die punch (251) is fixed on the lower die top plate (21). The core-pulling rod (26) is slidably connected inside the female mold and the lower die punch (251). A powder forming cavity (25) is formed between the female mold, the lower die punch (251) and the core-pulling rod (26). The powder forming cavity (25) and the upper die punch (252) are in corresponding positions. The space between the slot and the female mold forms a heating cavity (28).

5. A floating demolding bidirectional powder press according to claim 3, characterized in that: Four sets of floating plate lower guide posts (202) pass through the lower punch plate (21), and the lower end of the four sets of floating plate lower guide posts (202) is also connected by a core-pulling plate (27), which is fixed to the upper end of the core-pulling cylinder (24).

6. A floating demolding bidirectional powder press according to claim 5, characterized in that: A fixed support plate for the lower punch plate (21) is provided on both sides and between the lower crossbeam.

7. A floating demolding bidirectional powder press according to claim 3, characterized in that: The floating plate (20) slides up and down on the guide post (201) on the floating plate, and the bottom plate (21) slides up and down on the guide post (202) on the floating plate.

8. A floating demolding bidirectional powder press according to claim 7, characterized in that: A limit device is fixed on the upper surface of the lower impact plate (21) to limit the downward position of the floating plate (20).

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