Powder metallurgy product forming die and press machine

Abstract

The utility model discloses a powder metallurgy product forming die which comprises a female die, an upper punching die and a lower punching die, the female die is provided with a forming cavity, and the top of the forming cavity is provided with a feeding port. The upper stamping die can move up and down relative to the female die, a movable opening is formed in the bottom of the forming cavity, the lower stamping die is provided with a lower stamping step structure and used for blocking the movable opening so that raw material powder can be placed in the forming cavity, and the upper stamping die is provided with an upper stamping step structure. The upper stamping step structure can abut against the lower stamping step structure so that raw material powder in the forming cavity can be pressed and formed. The utility model further discloses a press machine. The upper stamping step structure and the lower stamping step structure are respectively arranged on the upper stamping die and the lower stamping die, so that the pressure resisting time of the upper stamping die and the lower stamping die in the pressing forming process is prolonged, and the pressure applied to raw material powder is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to a powder metallurgy product forming die and press. BACKGROUND

[0002] The powder metallurgy product can be widely applied to the production of various electronic components such as communication, energy, automobile industry, household appliance, automatic door control, inductor, filter, mutual inductor and inverter, especially in the 1990s, the new product switch power supply is widely used. As an excellent inductive magnetic core, it is widely used as various inductive components such as filtering, current stabilizing and energy storage in various switch power supply modules.

[0003] The manufacturing method of the powder metallurgy product is generally to fill raw material powder into the forming die of the press for compression molding. Generally, the forming die mainly comprises a middle die, an upper punch and a lower punch, the middle die is provided with a die cavity, when the die is opened, the upper punch is located above the die cavity, and the lower punch is located in the die cavity to block the bottom of the die cavity. After the raw material powder is filled into the die cavity, the die is closed, the upper punch descends into the die cavity and cooperates with the lower punch to press and form the raw material powder in the die cavity, and the lower punch ascends to eject the product from the die cavity and then discharges the product. The forming die has the following problems: because the upper punch and the lower punch are frequently stamped in the daily production process, and the structure of the upper punch and the lower punch is relatively simple, the pressure resistance time is short, and the pressure applied to the raw material powder is small. CONTENT OF THE UTILITY MODEL

[0004] According to one aspect of the utility model, a powder metallurgy product forming die is provided, which comprises:

[0005] The concave die is provided with a forming cavity, and the top of the forming cavity penetrates the top surface of the concave die to form a feeding port for feeding raw material powder;

[0006] The lower punch and the upper punch which can move up and down relative to the concave die, the bottom of the forming cavity penetrates the bottom surface of the concave die to form a movable opening, the lower punch is provided with a lower stamping step structure and is used for blocking the movable opening so that the raw material powder can be placed in the forming cavity, and the upper punch is provided with an upper stamping step structure, which can abut against the lower stamping step structure to press and form the raw material powder in the forming cavity with the downward movement of the upper punch.

[0007] The powder metallurgy product forming die has the upper stamping step structure and the lower stamping step structure on the upper punch and the lower punch, the lower stamping step structure on the lower punch can block the movable opening to enable the raw material powder to be placed in the forming cavity, and the upper punch can drive the upper stamping step structure to abut against the lower stamping step structure on the lower punch, so that the raw material powder in the forming cavity can be pressed and formed.

[0008] In some embodiments, the upper punch comprises an upper pressing column and an upper stamping piece, the upper stamping step structure is formed on the upper stamping piece; the upper stamping piece comprises an upper punch body and an upper punch pressing part, and the upper stamping step structure is formed between the upper punch body and the upper punch pressing part; and / or,

[0009] The lower punch comprises a lower pressing column and a lower stamping piece, and the lower stamping step structure is formed on the lower stamping piece; the lower stamping piece comprises a lower punch body and a lower punch pressing part, and the lower stamping step structure is formed between the lower punch body and the lower punch pressing part.

[0010] In some embodiments, the minimum outer diameter of the upper stamping step structure is greater than or equal to the outer diameter of the upper punch pressing part, and the maximum outer diameter of the upper stamping step structure is less than or equal to the minimum outer diameter of the upper punch body; and / or,

[0011] The minimum outer diameter of the lower stamping step structure is greater than or equal to the outer diameter of the lower punch pressing part, and the maximum outer diameter of the lower stamping step structure is less than or equal to the minimum outer diameter of the lower punch body.

[0012] In some embodiments, the upper stamping piece is detachably mounted on the upper pressing column, and / or the lower stamping piece is detachably mounted on the lower pressing column.

[0013] In some embodiments, the upper punch further comprises an upper pressing cover for connecting the upper pressing column and the upper stamping piece, the upper pressing cover has an upper accommodating cavity, the top of the upper accommodating cavity penetrates through the top surface of the upper pressing cover, and an upper pressing cover connecting port is formed on the top surface of the upper pressing cover, the upper pressing cover connecting port is detachably connected with the upper pressing column, the bottom of the upper accommodating cavity penetrates through the bottom surface of the upper pressing cover, and an upper pressing cover opening is formed on the bottom surface of the upper pressing cover, and the upper stamping piece extends out of the bottom surface of the upper pressing cover through the upper pressing cover opening; and / or,

[0014] The lower punch further comprises a lower pressing cover for connecting the lower pressing column and the lower punch, the lower pressing cover is provided with a lower accommodating cavity, the bottom of the lower accommodating cavity penetrates through the bottom surface of the lower pressing cover and is provided with a lower pressing cover connecting port on the bottom surface of the lower pressing cover, the lower pressing cover connecting port is detachably connected with the lower pressing column, the top of the lower accommodating cavity penetrates through the top surface of the lower pressing cover and is provided with a lower pressing cover opening on the top surface of the lower pressing cover, and the lower punch extends out of the top surface of the lower pressing cover through the lower pressing cover opening.

[0015] In some embodiments, a middle core die is further included, the middle core die is arranged in the movable opening and is provided with a middle core step structure, and the upper punch and the lower punch are both provided with hollow structures for avoiding the middle core die, so that the upper punch and the lower punch can be sleeved on the middle core die.

[0016] In some embodiments, the middle core die comprises a middle core rod and a core rod base, and the middle core step structure is formed on the middle core rod; the middle core rod comprises a core rod body and a center hole forming part, and the middle core step structure is formed between the core rod body and the center hole forming part.

[0017] The minimum outer diameter of the middle core step structure is greater than the outer diameter of the center hole forming part, and the maximum outer diameter of the middle core step structure is less than the outer diameter of the core rod body.

[0018] In some embodiments, the middle core rod is detachably connected with the core rod base, and the core rod base is used for maintaining the up-down position of the middle core rod in the movable opening.

[0019] According to another aspect of the utility model, a press machine is provided, comprising a machine table, an upper driving mechanism, a lower driving mechanism and the powder metallurgy product forming die, the female die is detachably mounted on the machine table, the upper driving mechanism is used for driving the upper punch to move up and down relative to the female die, and the lower driving mechanism is used for driving the lower punch to move upwards in the movable opening to eject the press-formed product out of the forming cavity.

[0020] The press machine of the utility model utilizes the powder metallurgy product forming die to manufacture the powder metallurgy product, the upper punch step structure and the lower punch step structure are arranged on the upper punch and the lower punch respectively, in the process of press forming of raw material powder, the lower punch step structure on the lower punch can block the movable opening so that the raw material powder can be placed in the forming cavity, and the upper punch moves downwards to drive the upper punch step structure to abut against the lower punch step structure on the lower punch, so that the raw material powder in the forming cavity can be press formed. Since the upper punch and the lower punch are respectively provided with the upper punch step structure and the lower punch step structure, the pressure resistance time of the upper punch and the lower punch in the press forming process is prolonged, and the pressure applied to the raw material powder is increased.

[0021] In some embodiments, further comprising a horizontal feeding mechanism capable of moving horizontally on the die to fill raw material powder into the forming cavity; and / or,

[0022] Further comprising a horizontal discharging mechanism capable of moving horizontally on the die to push the product ejected by the lower punch away from the die. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a perspective view of the powder metallurgy product forming die in the utility model;

[0024] Figure 2 It is an exploded view of the powder metallurgy product forming die in the utility model;

[0025] Figure 3 It is a sectional view of the upper punch part in the utility model;

[0026] Figure 4 It is a sectional view of the die in the utility model;

[0027] Figure 5 It is a sectional view of the lower punch part in the utility model;

[0028] Figure 6 It is a sectional view of the core rod in the utility model.

[0029] In the drawing: 10, machine table; 11, upper support plate; 12, lower support plate; 13, upper fixed flange; 14, lower fixed flange; 20, upper punch; 21, upper pressing column; 22, upper punch part; 23, upper pressing cap; 24, upper pressing cap connecting port; 25, upper pressing cap opening; 26, upper punch body; 27, upper punch pressing part; 28, upper punch step structure; 30, lower punch; 31, lower pressing column; 32, lower punch part; 33, lower pressing cap; 34, lower pressing cap connecting port; 35, lower pressing cap opening; 36, lower punch body; 37, lower punch pressing part; 38, lower punch step structure; 39, pressure bearing pad; 40, die; 41, forming cavity; 42, movable opening; 43, die pressing cap; 44, gasket; 50, core rod; 51, core rod body; 52, center hole forming part; 53, core rod step structure; 54, core rod base; 55, base fixed ring; 60, hollow structure. DETAILED DESCRIPTION

[0030] The utility model will make further detailed description in combination with the drawings, obviously, the described embodiment is a part of the utility model embodiment, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0031] It should be noted that the terms "first", "second" and the like are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0032] In the utility model, unless otherwise specifically specified and limited, the terms "installation", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; It can be mechanical connection, or electrical connection or communication with each other; It can be directly connected, or indirectly connected through an intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0033] In the utility model, unless otherwise specifically specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly contacted through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be the first feature directly above or obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be the first feature directly below or obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the description and the features of different embodiments or examples without contradicting each other.

[0035] The utility model provides a kind of press, including machine table 10, upper drive mechanism, lower drive mechanism, horizontal feeding mechanism, horizontal discharging mechanism and powder metallurgy product forming die, please refer to Figure 1The powder metallurgy product forming die is especially suitable for forming of a magnetic powder core. The powder metallurgy product forming die is installed on the machine table 10. The horizontal feeding mechanism can fill raw powder into the powder metallurgy product forming die. The upper driving mechanism can provide power for opening and closing of the powder metallurgy product forming die. The lower driving mechanism can push the product out of the powder metallurgy product forming die. The horizontal discharging mechanism can push the product away from the powder metallurgy product forming die.

[0036] Wherein, please refer to Figures 1-2 The powder metallurgy product forming die comprises a female die 40, an upper punch 20 and a lower punch 30. The female die 40 is detachably installed on the machine table 10. The female die 40 has a forming cavity 41. The top of the forming cavity 41 has a feeding port formed through the top surface of the female die 40 for feeding raw powder. The horizontal feeding mechanism can move horizontally on the female die 40 to fill raw powder into the feeding port. The upper punch 20 is located above the female die 40 and can move up and down relative to the female die 40. The upper driving mechanism is used to drive the upper punch 20 to move up and down relative to the female die 40. The bottom of the forming cavity 41 has a movable opening 42 formed through the bottom surface of the female die 40. The lower punch 30 is located in the female die 40 and can block the movable opening 42 so that the raw powder can be placed in the forming cavity 41. The lower driving mechanism is used to drive the lower punch 30 to move up and down in the movable opening 42. When the lower punch 30 moves upward in the movable opening 42, it can push the product out of the forming cavity 41. The lower punch 30 has a lower stamping step structure 38. The upper punch 20 has an upper stamping step structure 28. When the upper punch 20 moves downward, the upper stamping step structure 28 can enter the forming cavity 41 and abut against the lower stamping step structure 38 to press and form the raw powder in the forming cavity 41. The horizontal discharging mechanism can move horizontally on the female die 40 to push the product out of the female die 40. The product is pushed onto the machine table 10 to realize discharging. Since the upper punch 20 and the lower punch 30 are respectively provided with the upper stamping step structure 28 and the lower stamping step structure 38, the pressure resistance time of the upper punch 20 and the lower punch 30 during the pressing and forming process is prolonged, and the pressure applied to the raw powder is increased.

[0037] Wherein, the upper punch 20 comprises an upper pressing column 21 and an upper stamping piece 22. The upper stamping step structure 28 is formed on the upper stamping piece 22. The upper stamping piece 22 is detachably installed on the upper pressing column 21. The lower punch 30 comprises a lower pressing column 31 and a lower stamping piece 32. The lower stamping step structure 38 is formed on the lower stamping piece 32. The lower stamping piece 32 is detachably installed on the lower pressing column 31.

[0038] Please refer to Figures 1-3The upper punch 22 comprises an upper punch body 26 and an upper punch pressing part 27, and an upper punch step structure 28 is formed between the upper punch body 26 and the upper punch pressing part 27, and the upper punch body 26 is detachably connected with the upper punch column 21. That is, the upper punch step structure 28 is added to the upper punch 22, so that the upper punch 22 can bear pressure for a longer time and the pressure applied to the raw material powder is larger during the pressing process.

[0039] Please refer to Figure 1 、 2 , 5, the lower punch 32 comprises a lower punch body 36 and a lower punch pressing part 37, and a lower punch step structure 38 is formed between the lower punch body 36 and the lower punch pressing part 37, and the lower punch body 36 is detachably connected with the lower punch column 31. That is, the lower punch step structure 38 is added to the lower punch 32, so that the lower punch 32 can bear pressure for a longer time and the pressure applied to the raw material powder is larger during the pressing process.

[0040] Please refer to Figure 3 The minimum outer diameter of the upper punch step structure 28 is greater than or equal to the outer diameter of the upper punch pressing part 27, and the maximum outer diameter of the upper punch step structure 28 is less than or equal to the minimum outer diameter of the upper punch body 26. The upper punch step structure 28 is thus arranged to have a buffering effect and can further improve the pressure resistance.

[0041] Please refer to Figure 5 The minimum outer diameter of the lower punch step structure 38 is greater than or equal to the outer diameter of the lower punch pressing part 37, and the maximum outer diameter of the lower punch step structure 38 is less than or equal to the minimum outer diameter of the lower punch body 36. The lower punch step structure 38 is thus arranged to have a buffering effect and can further improve the pressure resistance.

[0042] In specific implementation, the upper punch 22 and the lower punch 32 have high hardness after quenching, so the upper punch step structure 28 and the lower punch step structure 38 and other punch steps thereon cannot be too large, and the size of the connection between the punch pressing part and the punch step cannot be too large, otherwise metal fatigue will occur at the connection to cause fracture. Therefore, the outer diameter of the punch step is slightly larger than the part connected thereto.

[0043] When the press machine is working, please refer to Figure 1 、 2, 3, 5, the lower punch 32 of the lower die 30 is located at the bottom of the forming cavity 41 to close the movable opening 42 of the forming cavity 41, the horizontal feeding mechanism moves horizontally on the machine table 10 to move to the concave die 40, the horizontal feeding mechanism fills the raw material powder into the forming cavity 41 through the feeding port, the upper driving mechanism drives the upper die 20 to move downward to perform the mold closing, the lower punch 32 cooperates with the upper punch 22 to press and form the raw material powder in the forming cavity 41. The upper driving mechanism drives the upper die 20 to move upward to realize the mold opening, the lower die 30 moves upward to push the product out of the forming cavity 41, at this time the horizontal discharging mechanism moves horizontally on the machine table 10 to push the product away from the concave die 40 to realize the discharging. By setting the upper die 20 and the lower die 30 as a split structure, even if the upper die 20 includes the upper pressing column 21 and the upper punch 22, and the lower die 30 includes the lower pressing column 31 and the lower punch 32, when the upper die 20 moves downward, the upper punch 22 can abut against the lower punch 32 to press and form the raw material powder in the forming cavity 41, when the lower die 30 moves upward, the lower punch 32 can push the pressed and formed product out of the forming cavity 41 for discharging. When the lower punch 32 and the upper punch 22 are worn or need to be replaced with different types of punches, only the lower punch 32 and the upper punch 22 can be removed and replaced, so that the entire upper die 20 and the lower die 30 do not need to be replaced, which is beneficial to reduce the cost.

[0044] Please refer to Figures 1-2 , the machine table 10 is provided with a mounting groove, and the powder metallurgy product forming die further comprises a concave die pressing cover 43, which is used for pressing and fixing the concave die 40 in the mounting groove. Specifically, a gasket 44 is arranged between the concave die 40 and the mounting groove, and more specifically, the concave die pressing cover 43 is locked on the machine table 10 by a fastener. In this way, by setting the concave die 40 and the concave die pressing cover 43 as a split structure, they can be conveniently replaced.

[0045] The upper driving mechanism and the lower driving mechanism can be oil cylinders, air cylinders or motors.

[0046] The above horizontal movement refers to movement in the horizontal direction, please refer to Figures 1-2, the horizontal direction is the left-right direction, and the up-down movement is the movement along the up-down (vertical) direction. In a preferred embodiment, the horizontal feeding mechanism and the horizontal discharging mechanism are integrated into the same mechanism, which can include a feeding hopper, a feeding pipe, a pushing member, and a feeding and discharging driving mechanism. The feeding hopper can be installed above the concave die 40, the output end of the feeding hopper is connected with the input end of the feeding pipe, the pushing member can move left and right on the machine table 10 to move left and right on the concave die 40, the feeding pipe is installed on the pushing member, and the feeding and discharging driving mechanism is used to drive the pushing member to move left and right on the machine table 10. With the movement of the pushing member, the feeding pipe can move synchronously. When the feeding and discharging driving mechanism drives the pushing member to move from left to right to the feeding port of the concave die 40, the raw material powder is poured from the output end of the feeding pipe into the molding cavity 41 through the feeding port, and then the feeding and discharging driving mechanism drives the pushing member to retreat to the left side of the concave die 40 so that the upper punch 20 moves downward to realize the clamping. After the product is formed and is pushed out of the molding cavity 41 by the lower punch 30, the feeding and discharging driving mechanism drives the pushing member to move right to push the product away from the concave die 40 to complete the discharging. Specifically, the output end of the feeding hopper can be provided with a control valve for controlling the opening and closing of the port, so as to effectively control the pouring of the raw material powder. More specifically, the feeding and discharging driving mechanism can be an oil cylinder, an air cylinder, or a motor driving component.

[0047] Please refer to Figures 1-2 The upper punch 20 further includes an upper pressing cover 23 for connecting the upper pressing column 21 and the upper punch member 22. The upper pressing cover 23 has an upper accommodating cavity. The top of the upper accommodating cavity penetrates through the top surface of the upper pressing cover 23, and the upper pressing cover connection port 24 is formed on the top surface of the upper pressing cover 23. The upper pressing cover connection port 24 is connected with the upper pressing column 21 through screw threads. The bottom of the upper accommodating cavity penetrates through the bottom surface of the upper pressing cover 23, and the upper pressing cover opening 25 is formed on the bottom surface of the upper pressing cover 23. The upper punch member 22 extends out of the bottom surface of the upper pressing cover 23 through the upper pressing cover opening 25. In this way, the upper punch 20 is convenient for disassembling and assembling the upper punch member 22.

[0048] Please refer to Figures 1-2 The lower punch 30 further includes a lower pressing cover 33 for connecting the lower pressing column 31 and the lower punch member 32. The lower pressing cover 33 has a lower accommodating cavity. The bottom of the lower accommodating cavity penetrates through the bottom surface of the lower pressing cover 33, and the lower pressing cover connection port 34 is formed on the bottom surface of the lower pressing cover 33. The lower pressing cover connection port 34 is connected with the lower pressing column 31 through screw threads. The top of the lower accommodating cavity penetrates through the top surface of the lower pressing cover 33, and the lower pressing cover opening 35 is formed on the top surface of the lower pressing cover 33. The lower punch member 32 extends out of the top surface of the lower pressing cover 33 through the lower pressing cover opening 35. In this way, the lower punch 30 is convenient for disassembling and assembling the lower punch member 32.

[0049] Of course, please refer to Figures 1-2 The upper pressing cover connection port 24 and the upper pressing column 21, and the lower pressing cover connection port 34 and the lower pressing column 31 can also be connected through buckling.

[0050] Specifically, please refer to Figures 1-2 , the lower receiving cavity of the lower cover 33 is also provided with a pressure bearing pad 39 between the lower pressing column 31 and the lower pressing part 32, which can help to improve the pressure bearing capacity.

[0051] Because the annular product needs to be produced in actual production, please refer to Figures 1-2 、 2 , 4, 6, the powder metallurgy product forming die also includes a middle core die installed in the installation groove and placed in the movable opening 42. The upper pressing part 22 and the lower pressing part 32 each have a hollow structure 60 for avoiding the middle core die, so that the upper pressing part 22 and the lower pressing part 32 can be sleeved on the middle core die and move up and down relative to the middle core die. That is, the middle core die can be maintained in the up-down position in the movable opening 42, and the lower pressing part 32 is sleeved on the middle core die through the hollow structure 60 thereon, so that the lower pressing part 32 can move up and down along the middle core die, and the middle core die provides a guiding effect. The top surface of the lower pressing part 32 is flush with the bottom surface of the concave die 40 to block the movable opening 42, and the raw material powder enters the forming cavity 41 from the feeding port. When the mold is closed, the upper punch 20 moves downward, so that the upper pressing part 22 moves downward into the forming cavity 41. Since the upper punch 20, the lower punch 30 and the middle core die are coaxially arranged, the downward movement of the upper pressing part 22 causes the middle core die to pass through the hollow structure 60 of the upper pressing part 22, so that the bottom surface of the upper pressing part 22 abuts against the top surface of the lower pressing part 32. The raw material powder in the forming cavity 41 can be pressed to form an annular product with a central hole under the action of the middle core die. When the mold is opened, the upper punch 20 moves upward, and the upper pressing part 22 is separated from the middle core die. The lower punch 30 moves upward, so that the lower pressing part 32 moves upward along the middle core die to lift the annular product pressed and formed in the forming cavity 41 to above the feeding port. At this time, the product ejected from the forming cavity 41 can be pushed away from the concave die 40 by the pushing piece and then discharged.

[0052] In specific implementation, the pressure bearing pad 39 between the lower pressing column 31 and the lower pressing part 32 also has a corresponding hollow structure 60 to avoid the middle core die.

[0053] Please refer to Figure 1 , the middle core die includes a middle core rod 50 and a core rod base 54, and a middle core step structure 53 is formed on the middle core rod 50. Figures 1-2 Please refer to , the middle core rod 50 includes a core rod body 51 and a central hole forming part 52, and the middle core step structure 53 is formed between the core rod body 51 and the central hole forming part 52. That is, the middle core step structure 53 is added outside the central hole forming part 52, which makes the middle core rod 50 have a longer pressure resistance time during the pressing and forming process and is not easy to break, which is beneficial to prolong the service life.

[0054] Please refer to Figure 6The minimum outer diameter of the middle core step structure 53 is greater than the outer diameter of the center hole forming part 52, and the maximum outer diameter of the middle core step structure 53 is less than the outer diameter of the core rod body 51. The middle core step structure 53 arranged in this way can further improve the pressure resistance.

[0055] The middle core rod 50 is detachably connected with the core rod base 54, and the core rod base 54 is used for maintaining the up-and-down position of the middle core rod 50 in the movable opening 42. Specifically, the machine table 10 comprises an upper support plate 11 and a lower support plate 12 arranged in an up-and-down separation manner between the upper support plate 11 and the lower support plate 12. An installation slot is formed on the upper support plate 11, and a support slot is formed on the lower support plate 12. The installation slot can be in communication with the support slot. The lower pressing column 31 can move up and down in the support slot, and the lower stamping part 32 can move up and down in the forming cavity 41 of the die 40 in the installation slot. The upper fixed flange 13 and the lower fixed flange 14 are installed in the support slot, and the base fixing ring 55 is arranged between the upper fixed flange 13 and the lower fixed flange 14. The upper fixed flange 13 and the lower fixed flange 14 are respectively installed at the top and the bottom of the support slot and can be cooperated to fix the base fixing ring 55 in the support slot. The middle core rod 50 is installed on the base fixing ring 55 through the core rod base 54. The inside of the upper fixed flange 13, the base fixing ring 55 and the lower fixed flange 14 provides a space for the up-and-down movement of the lower pressing column 31 and can play a guiding role. More specifically, the lower pressing column 31 also has a hollow structure 60 for avoiding the middle core die, so that the middle core die can be placed in the inside of the lower die 30 and fixed in the support slot by the base fixing ring 55, and meanwhile, the up-and-down movement of the lower pressing column 31 in the support slot is not affected.

[0056] Please refer to Figure 6 Figures 1-2 The middle core rod 50 is detachably connected with the core rod base 54 through a threaded connection, which can facilitate the disassembly and assembly of the middle core rod 50. Of course, a buckle can also be used for connection.

[0057] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the creative concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A powder metallurgy article forming die characterized by, The application relates to a die set for a powder compacting machine, comprising: a female die having a forming cavity, a top of the forming cavity being provided with an inlet for feeding raw material powder through a top surface of the female die; a lower punch and an upper punch capable of moving up and down relative to the female die, a bottom of the forming cavity being provided with a movable opening through a bottom surface of the female die, the lower punch being provided with a lower punch step structure on an upper surface of the lower punch and being used for blocking the movable opening so that the raw material powder can be placed in the forming cavity, the upper punch being provided with an upper punch step structure on a lower surface of the upper punch, the upper punch step structure being capable of abutting against the lower punch step structure to compact the raw material powder in the forming cavity as the upper punch moves downward.

2. The powder metallurgy article forming die of claim 1, wherein, The upper punch comprises an upper pressing column and an upper punch piece, the upper punch step structure being formed on the upper punch piece; the upper punch piece comprises an upper punch body and an upper punch pressing part, the upper punch step structure being formed between the upper punch body and the upper punch pressing part; and / or The lower punch comprises a lower pressing column and a lower punch piece, the lower punch step structure being formed on the lower punch piece; the lower punch piece comprises a lower punch body and a lower punch pressing part, the lower punch step structure being formed between the lower punch body and the lower punch pressing part.

3. The powder metallurgy article forming die of claim 2, wherein, The minimum outer diameter of the upper punch step structure is greater than or equal to the outer diameter of the upper punch pressing part, and the maximum outer diameter of the upper punch step structure is less than or equal to the minimum outer diameter of the upper punch body; and / or The minimum outer diameter of the lower punch step structure is greater than or equal to the outer diameter of the lower punch pressing part, and the maximum outer diameter of the lower punch step structure is less than or equal to the minimum outer diameter of the lower punch body.

4. The powder metallurgy article forming die of claim 2, wherein, The upper punch piece is detachably mounted on the upper pressing column, and / or the lower punch piece is detachably mounted on the lower pressing column.

5. The powder metallurgy article forming die of claim 4, wherein, The upper punch further comprises an upper pressing cover for connecting the upper pressing column and the upper punch piece, the upper pressing cover being provided with an upper accommodating cavity, a top of the upper accommodating cavity being provided with an upper pressing cover connecting port on a top surface of the upper pressing cover through the top surface of the upper pressing cover, the upper pressing cover connecting port being detachably connected with the upper pressing column, a bottom of the upper accommodating cavity being provided with an upper pressing cover opening on a bottom surface of the upper pressing cover through the bottom surface of the upper pressing cover, the upper punch piece extending out of the bottom surface of the upper pressing cover through the upper pressing cover opening; and / or The lower punch further comprises a lower pressing cover for connecting the lower pressing column and the lower punch piece, the lower pressing cover being provided with a lower accommodating cavity, a bottom of the lower accommodating cavity being provided with a lower pressing cover connecting port on a bottom surface of the lower pressing cover through the bottom surface of the lower pressing cover, the lower pressing cover connecting port being detachably connected with the lower pressing column, a top of the lower accommodating cavity being provided with a lower pressing cover opening on a top surface of the lower pressing cover through the top surface of the lower pressing cover, the lower punch piece extending out of the top surface of the lower pressing cover through the lower pressing cover opening.

6. The powder metallurgy article forming die of any one of claims 1-5, wherein, The application further relates to a middle core die, the middle core die being arranged in the movable opening and being provided with a middle core step structure, the upper punch and the lower punch both being provided with hollow structures for avoiding the middle core die, so that the upper punch and the lower punch can be sleeved on the middle core die.

7. The powder metallurgy article forming die of claim 6, wherein, The middle core die includes a middle core stem and a core stem base, and the middle core step structure is formed on the middle core stem; the middle core stem includes a core stem body and a center hole forming part, and the middle core step structure is formed between the core stem body and the center hole forming part; The minimum outer diameter of the middle core step structure is greater than the outer diameter of the center hole forming part, and the maximum outer diameter of the middle core step structure is less than the outer diameter of the core stem body.

8. The powder metallurgy article forming die of claim 7, wherein, The middle core stem is detachably connected with the core stem base, and the core stem base is used to maintain the up-and-down position of the middle core stem in the movable opening.

9. Press machine, characterized in that The machine table, the upper driving mechanism, the lower driving mechanism, and the powder metallurgy product forming die according to any one of claims 1-8 are included, the die is detachably mounted on the machine table, the upper driving mechanism is used to drive the upper punch to move up and down relative to the die, and the lower driving mechanism is used to drive the lower punch to move upward in the movable opening to push the press-formed product out of the forming cavity.

10. The press machine of claim 9, wherein, Further including a horizontal feeding mechanism, which can move horizontally on the die to fill raw powder into the forming cavity; and / or, Further including a horizontal discharging mechanism, which can move horizontally on the die to push the product pushed out by the lower punch away from the die.

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