Powder forming device

Abstract

The utility model provides a powder forming device which comprises a middle die, a powder feeding mechanism, an upper punching die, a lower punching die, a floating unit, a workbench, a first sleeve, a fixing rod, a first spring and a through hole. According to the utility model, the floating unit capable of enabling the middle die to float up and down is arranged, so that the pressure borne by a pressed blank in the pressing forming process is the elastic force generated by the spring, and the spring can be uniformly compressed in the uniform moving process of the upper punching die, so that the pressure borne by the pressed blank is uniformly increased; therefore, the extrusion duration of the upper punching die is prolonged, meanwhile, the pressure is uniformly changed, the density of a pressed blank is improved, and the quality of the pressed blank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy, in particular to a powder forming device. Background Art

[0002] Powder metallurgy is a process for producing metal powders or using metal powders (or mixtures of metal and non-metallic powders) as raw materials, forming and sintering them to create metal materials, composite materials, and various workpieces. Powder metallurgy includes the steps of powder production, compacting, sintering, and post-processing. Compacting (also known as shaping) is typically performed on a shaping press.

[0003] Existing powder forming devices are generally equipped with an upper die, a middle die and a lower die. The powder enters the cavity of the middle die through a feeding device, and then is punched and formed by the upper die, and finally discharged through the lower die. Among them, since the middle die is generally fixed on a workbench, the punching and forming time is generally short. This results in the powder not being in a state of uniform contraction during the pressing process, making the downward movement of the upper die nonlinear, so that the pressure of the hydraulic press is not in a state of uniform change during the pressurization process. When the unevenly changing pressure acts on the powder, it will affect the improvement of the density of the compact, thereby limiting the quality of the compact. Utility Model Content

[0004] The purpose of the present invention is to design a powder forming device to solve the problems raised by the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: including a powder feeding mechanism installed on the top of the middle mold, an upper punch and a lower punch aligned with the cavity of the middle mold, and a workbench connected to the middle mold through a number of floating units, the floating unit including a first sleeve fixed to the bottom of the middle mold, a fixed rod fixed to the top of the workbench and slidably connected to the middle mold, and a first spring sleeved on the outer circle of the fixed rod, the first spring is located inside the first sleeve and the two ends of the first spring are respectively fixed to the inner bottom of the first sleeve and the top of the workbench, the middle mold is provided with a through hole, and the fixed rod is slidably connected to the through hole.

[0005] Furthermore, a dust cover is provided on the top of the middle mold, and the through hole is located inside the dust cover.

[0006] Furthermore, a limiting sleeve is provided on the workbench, and one end of the first spring is located inside the limiting sleeve.

[0007] Furthermore, the lower punch comprises a moving block slidably connected to the inner wall of the cavity and an elastic moving assembly for realizing the up and down movement of the moving block. The top of the moving block is provided with a profiling platform abutting against the bottom of the pressed blank.

[0008] Furthermore, the bottom of the middle mold is provided with a fixed chamber aligned with the cavity, the elastic moving assembly includes a plurality of guide rods fixedly connected to the fixed chamber and a second spring sleeved on the guide rods, the middle part of the moving block is slidably connected to the bottom of the cavity, and the bottom of the moving block is fixed with a moving platform, the guide rods are slidably connected to the moving platform, and the two ends of the second spring are respectively connected to the top of the moving platform and the top of the fixed chamber.

[0009] Furthermore, the elastic moving assembly also includes a cylinder installed below the workbench, and a top block for driving the moving block to move is fixedly connected to the output end of the cylinder, and the top block passes through the workbench.

[0010] Furthermore, there are two of the mold cavity, the fixed chamber and the elastic movable component, and slots are provided on the adjacent side walls of the two fixed chambers. The lower parts of the two movable blocks are connected by a connecting block, and the connecting block passes through the slot and the bottom of the connecting block is attached to the top block. The gap size between the top of the connecting block and the top of the slot is greater than the depth size of the mold cavity.

[0011] Furthermore, a chamfer is provided between the top of the connecting block and the moving block.

[0012] Furthermore, a conical platform is provided at the bottom of the connecting block, and the bottom of the conical platform is in contact with the top block.

[0013] Furthermore, a conical groove is provided at the bottom of the cavity, and a conical boss is provided on the upper portion of the moving block to cooperate with the conical groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the present invention is provided with a floating unit that can make the middle die float up and down. Therefore, the pressure exerted on the blank during the pressing process is the elastic force generated by the spring. Therefore, when the upper punch moves evenly, the spring will be evenly compressed, thereby evenly increasing the pressure exerted on the blank. Therefore, the present invention increases the extrusion time of the upper punch while making the pressure change evenly, thereby increasing the density of the blank and improving the quality of the blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a partial cross-sectional schematic diagram of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of the elastic moving component.

[0019] Among them: 1. upper punch; 2. dust cover; 3. middle die; 4. first sleeve; 5. first spring; 6. limiting sleeve; 7. ejector block; 8. workbench; 9. fixed chamber; 10. powder feeding mechanism; 11. cylinder; 12. notch; 13. moving block; 14. chamfer; 15. conical platform; 16. cavity; 17. through hole; 18. fixed rod; 19. connecting block; 20. profiling platform; 21. conical boss; 22. second spring; 23. guide rod; 24. moving platform; 25. pressed blank. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0021] Example: Please refer to Figure 1-3 , a powder molding device includes a powder feeding mechanism 10 installed on the top of the middle mold 3, an upper punch 1 and a lower punch aligned with the cavity 16 of the middle mold 3, and a workbench 8 connected to the middle mold 3 through a plurality of floating units. The floating unit includes a first sleeve 4 fixed to the bottom of the middle mold 3, a fixed rod 18 fixed to the top of the workbench 8 and slidably connected to the middle mold 3, and a first spring 5 sleeved on the outer circle of the fixed rod 18. The first spring 5 is located inside the first sleeve 4 and the two ends of the first spring 5 are respectively fixed to the inner bottom of the first sleeve 4 and the top of the workbench 8. A through hole 17 is provided on the middle mold 3, and the fixed rod 18 is slidably connected to the through hole 17; wherein the sliding connection adopts the form of clearance fit, and the powder feeding mechanism 10 and the upper punch 1 both adopt existing Common mechanisms will not be described in detail here; when the powder needs to be pressed into shape, it is only necessary to pour the powder into the cavity 16 through the powder feeding mechanism 10, and then the upper punch 1 is started to punch the powder. During the punching process, the descending speed of the upper punch 1 is kept unchanged. At this time, the spring is evenly compressed. At this time, the pressure on the powder is the elastic force generated by the spring. Since the elastic force generated by the spring at this time increases evenly, the pressure on the powder increases evenly. When the specified pressure is reached, the upper punch 1 moves up, and then the lower punch is started, thereby realizing the formation of the green sheet 25; therefore, the present invention increases the extrusion time of the upper punch 1 while making the pressure change evenly, thereby increasing the density of the green sheet 25 and improving the quality of the green sheet 25.

[0022] In this embodiment, a dust cover 2 is provided on the top of the middle die 3, and a through hole 17 is located inside the dust cover 2, thereby preventing powder from entering the through hole 17 and preventing the fixed rod 18 from moving, and a limiting sleeve 6 is provided on the workbench 8, and one end of the first spring 5 is located inside the limiting sleeve 6, thereby preventing the first spring 5 from being deformed normally and having a certain limiting effect on the middle die 3; and the lower punch includes a moving block 13 that is slidably connected to the inner wall of the cavity 16 and an elastic moving component that realizes the up and down movement of the moving block 13, the top of the moving block 13 is provided with a profiling table 20 that is in contact with the bottom of the pressed blank 25, and the bottom of the middle die 3 is provided with The fixed chamber 9 is aligned with the cavity 16, and the elastic moving assembly includes a plurality of guide rods 23 fixed to the fixed chamber 9 and a second spring 22 sleeved on the guide rods 23. The middle part of the moving block 13 is slidably connected to the bottom of the cavity 16, and the bottom of the moving block 13 is fixed with a moving platform 24. The guide rods 23 are slidably connected to the moving platform 24, which improves the stability of the movement of the moving block 13. The two ends of the second spring 22 are respectively connected to the top of the moving platform 24 and the top of the fixed chamber 9. The elastic moving assembly also includes a cylinder 11 installed under the workbench 8. The output end of the cylinder 11 is fixed with a cylinder for driving The top block 7 moved by the moving block 13 runs through the workbench 8. There are two cavities 16, fixed chambers 9 and elastic moving components. The adjacent side walls of the two fixed chambers 9 are provided with notches 12. The lower parts of the two moving blocks 13 are connected by a connecting block 19. The connecting block 19 runs through the notch 12 and the bottom of the connecting block 19 is in contact with the top block 7. The gap between the top of the connecting block 19 and the top of the notch 12 is greater than the depth of the cavity 16. The sliding connection adopts the form of clearance fit. When the cylinder 11 is started, the top block 7 will move upward to lift the connecting block 19, thereby driving the moving block 13 to move upward. The movable block 13 moves upward, thereby realizing the demolding of the blank 25. During this process, the second spring 22 is compressed. When the blank 25 is demolded, the cylinder 11 is reset, and the movable block 13 is reset under the action of the second spring 22; and a chamfer 14 is provided between the top of the connecting block 19 and the movable block 13, and a conical platform 15 is provided at the bottom of the connecting block 19. The bottom of the conical platform 15 is in contact with the top block 7, and a conical groove is provided at the bottom of the cavity 16. The upper part of the movable block 13 is provided with a conical boss 21 that cooperates with the conical groove, which improves the strength of the movable block 13 and the connecting block 19 and prevents the movable block 13 and the connecting block 19 from deformation.

[0023] Working principle: When the powder needs to be pressed and molded, it is only necessary to inject the powder into the cavity 16 through the powder feeding mechanism 10, and then the upper punch 1 is started to punch the powder. During the punching process, the descending speed of the upper punch 1 is kept unchanged. At this time, the spring is evenly compressed, and the pressure on the powder is the elastic force generated by the spring. Since the elastic force generated by the spring at this time increases evenly, the pressure on the powder increases evenly. When the specified pressure is reached, the upper punch 1 moves up, and then the cylinder 11 is started, and the top block 7 will move upward to lift the connecting block 19. And it drives the moving block 13 to move upward to realize the demolding of the green compact 25. During this process, the second spring 22 is compressed. When the green compact 25 is demolded, the powder feeding mechanism 10 is started to push the green compact 25 that has just been demolded away. Then the cylinder 11 is ventilated in the reverse direction. While the top block 7 moves downward, the moving block 13 is reset under the action of the second spring 22. Then the powder feeding mechanism 10 injects the powder into the cavity 16 again to realize the continuity of powder pressing. Therefore, the present invention increases the extrusion time of the upper punch 1 while making the pressure change evenly, thereby increasing the density of the green compact 25 and improving the quality of the green compact 25.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "upper," "lower," "left," "right," "front," "rear," and similar expressions used herein are for illustrative purposes only.

[0025] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A powder forming device comprising a powder feeding mechanism (10) mounted on the top of a middle die (3), an upper punch (1) and a lower punch respectively aligned with a die cavity (16) of the middle die (3), characterized in that: It also includes a workbench (8) connected to the middle mold (3) through a plurality of floating units, wherein the floating units include a first sleeve (4) fixed to the bottom of the middle mold (3), a fixed rod (18) fixed to the top of the workbench (8) and slidably connected to the middle mold (3), and a first spring (5) sleeved on the outer circle of the fixed rod (18), the first spring (5) is located inside the first sleeve (4) and the two ends of the first spring (5) are respectively fixed to the inner bottom of the first sleeve (4) and the top of the workbench (8), the middle mold (3) is provided with a through hole (17), and the fixed rod (18) is slidably connected to the through hole (17).

2. The powder forming device according to claim 1, wherein: A dust cover (2) is provided on the top of the middle mold (3), and the through hole (17) is located inside the dust cover (2).

3. The powder forming device according to claim 1, wherein: A limiting sleeve (6) is provided on the workbench (8), and one end of the first spring (5) is located inside the limiting sleeve (6).

4. The powder forming device according to claim 1, wherein: The lower punch comprises a moving block (13) slidably connected to the inner wall of the cavity (16) and an elastic moving assembly for realizing the up and down movement of the moving block (13); the top of the moving block (13) is provided with a profiling platform (20) abutting against the bottom of the pressed blank (25).

5. The powder forming device according to claim 4, characterized in that: The bottom of the middle mold (3) is provided with a fixed chamber (9) aligned with the cavity (16), the elastic moving component includes a plurality of guide rods (23) fixedly connected to the fixed chamber (9) and a second spring (22) sleeved on the guide rods (23), the middle part of the moving block (13) is slidably connected to the bottom of the cavity (16), and the bottom of the moving block (13) is fixedly connected to a moving platform (24), the guide rods (23) are slidably connected to the moving platform (24), and the two ends of the second spring (22) are respectively connected to the top of the moving platform (24) and the top of the fixed chamber (9).

6. The powder forming device according to claim 5, characterized in that: The elastic moving assembly further comprises a cylinder (11) installed below the workbench (8), and a top block (7) for driving the moving block (13) to move is fixedly connected to the output end of the cylinder (11), and the top block (7) passes through the workbench (8).

7. The powder forming device according to claim 6, characterized in that: The mold cavity (16), the fixed chamber (9) and the elastic moving assembly are each provided with two, and the adjacent side walls of the two fixed chambers (9) are provided with notches (12). The lower parts of the two moving blocks (13) are connected by a connecting block (19), and the connecting block (19) passes through the notch (12) and the bottom of the connecting block (19) is in contact with the top block (7). The gap size between the top of the connecting block (19) and the top of the notch (12) is greater than the depth size of the mold cavity (16).

8. The powder forming device according to claim 7, characterized in that: A chamfer (14) is provided between the top of the connecting block (19) and the moving block (13).

9. The powder forming device according to claim 7, characterized in that: A conical platform (15) is provided at the bottom of the connecting block (19), and the bottom of the conical platform (15) is in contact with the top block (7).

10. The powder forming device according to claim 5, characterized in that: The bottom of the mold cavity (16) is provided with a tapered groove, and the upper part of the moving block (13) is provided with a tapered boss (21) that matches the tapered groove.

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