Powder metallurgy forming die with sliding block in sliding block and forming method of powder metallurgy forming die

Abstract

The invention relates to the technical field of powder metallurgy forming, and discloses a powder metallurgy forming die with a sliding block in a sliding block and a forming method thereof, and the powder metallurgy forming die with the sliding block in the sliding block comprises an upper die base, a lower die base and a side sliding block assembly; an upper mold core is arranged in the upper mold base; the top end of the upper mold core is connected with two first inclined sliding block assemblies distributed left and right. The lower die holder is arranged below the upper die holder; a lower mold core corresponding to the lower mold core is arranged in the lower mold base; a push block is arranged in the lower mold core; a push plate is arranged in the lower die base, an ejection mechanism is arranged in the push plate, and one end of the ejection mechanism is connected with the bottom end of the push block. The side sliding block assembly is arranged on one side of the lower mold core and used for forming a straight-through hole of a green body. Two groups of forming blocks distributed left and right are arranged on the side, close to the upper mold core, of the side sliding block assembly and are slidably connected to the lower mold base; two groups of second inclined sliding block assemblies which are distributed left and right are arranged on the side sliding block assembly; the two sets of second inclined sliding block assemblies are connected to the side sliding block assemblies in a sliding mode and used for inclined through hole forming of the green body.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy forming, in particular to a powder metallurgy forming die with a slider in a slider and a forming method thereof. Background Art

[0002] Powder metallurgy forming dies are dies used to press solid metal powder into shape. The powder raw materials are quantitatively injected into the forming die, and then the preform is formed. The preform is then ejected by a ejecting device, degreased and sintered to finally make powder metallurgy materials or parts.

[0003] For some columnar structural products, such as Figure 1 As shown, the interior of the column on one side of the product has four groups of straight through holes parallel to the center line of the column, and a group of oblique through holes is provided between two of the groups of straight through holes. Currently, most of these products are prefabricated using powder metallurgy forming dies, which are then degreased and sintered to obtain a semi-finished product with multiple groups of straight through holes. Finally, the oblique through holes are machined into the semi-finished product to obtain the finished product. However, the existing columnar structure processing steps are complicated, and the straight through holes and oblique through holes cannot be formed as a whole. They need to be processed twice, which is prone to accumulated errors and affects the positional accuracy of the oblique through holes. In addition, the processing depth of the oblique through holes is large, which is difficult to process. The tool is prone to shaking during processing, which reduces the processing quality of the product.

[0004] Therefore, there is an urgent need for a powder metallurgy forming die with a slider in a slider and a forming method thereof to solve the above problems. Summary of the Invention

[0005] Based on the above, the purpose of the present invention is to provide a powder metallurgy forming die with a slider in a slider and a forming method thereof, so as to solve the problems that the existing columnar structure processing steps are complicated, the straight through hole and the inclined through hole cannot be formed as one piece, and secondary processing is required, which is prone to accumulated errors, and the processing depth of the inclined through hole is large, and the processing difficulty is high.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The powder metallurgy forming die with a slider in the slider comprises an upper die base, a lower die base and a side slider assembly; an upper die core is provided in the upper die base; two groups of first oblique slider assemblies distributed left and right are connected to the top of the upper die core; the lower die base is provided below the upper die base; a lower die core corresponding to the upper die core is provided in the lower die base; a push block is provided in the lower die core; a push plate is provided in the lower die base, and an ejection mechanism is provided in the push plate, one end of the ejection mechanism is connected to the bottom end of the push block; the side slider assembly is provided on one side of the lower die core for forming straight through holes in the green embryo; the side slider assembly is provided with two groups of forming blocks distributed left and right near the side of the upper die core, and is slidably connected to the lower die base; two groups of second oblique slider assemblies distributed left and right are provided on the side slider assembly; two groups of the second oblique slider assemblies are slidably connected to the side slider assembly for forming oblique through holes in the green embryo.

[0008] As a preferred solution for a powder metallurgy forming mold with a slider in a slider, the side slider assembly includes a first slider seat, a first limit block and a cylinder; the cylinder is fixed to the outside of the lower die seat, and the output end of the cylinder is connected to one end of the first slider seat; the first slider seat is slidably connected to the lower die seat, and the other end of the first slider seat is in conflict with one side of the lower die core, and the forming block is located between the first slider seat and the lower die core; the first limit block is arranged in the upper die seat, and one side of the bottom end of the first limit block is in conflict with the side surface of the other end of the first slider seat.

[0009] As a preferred solution for the powder metallurgy forming mold with a slider in a slider, the forming block is circumferentially provided with a first straight rod, a second straight rod, a third straight rod, a fourth straight rod and a fifth straight rod; one end of the fifth straight rod is connected to one end of the first inclined slider assembly.

[0010] As a preferred solution for a powder metallurgy forming mold with a slider in a slider, the second inclined slider assembly includes a second slider seat and a second limit block; the first slider seat is provided with two groups of equally spaced inclined slide grooves, and the inclined slide grooves are inclined; the second slider seat is slidably connected to the inclined slide grooves, and one end of the second slider seat is connected to a first inclined rod; one end of the first inclined rod is sequentially passed through the first slider seat, the forming block, the third support rod and the fourth straight rod; the second limit block is provided in the upper mold seat, and the second limit block is located above the second slider seat; the second limit block and the second slider seat are connected by an inclined guide rod.

[0011] As a preferred solution for a powder metallurgy forming mold with a slider in a slider, three groups of first push rods distributed at equal intervals are provided at the bottom end of the push block; the ejection mechanism is provided in two groups, and the two groups of ejection mechanisms are distributed on the left and right sides of the bottom end of the push block, and the ejection mechanism is located between two adjacent groups of first push rods.

[0012] As a preferred solution for a powder metallurgy forming mold with a slider in a slider, the ejection mechanism includes a rotating block, a fixed plate and a second push rod; the rotating block is rotatably connected to the push plate through a rotating shaft; the fixed plate is arranged on the surface of the push plate and is located above the rotating block; a pressure rod is provided between the rotating block and the fixed plate; one end of the second push rod is fixed in the rotating block, and the other end of the second push rod is passed through the fixed plate and extends into the push block; a lifting sleeve is provided between the second push rod and the push block.

[0013] A powder metallurgy forming method of a slider with a slider, using the above-mentioned powder metallurgy forming die of the slider with a slider, comprises the following steps:

[0014] S1. Debug the upper die base and the lower die base to make them docked, and calibrate them at the same time;

[0015] S2. The mold is closed. The upper mold base approaches the lower mold base. The side slide assembly slides to the side of the lower mold core and contacts the lower mold core. Subsequently, the first inclined slide assembly moves to the top of the upper mold core, and the two contact each other. At the same time, the second inclined slide assembly moves to the side slide assembly close to the lower mold core. A molding cavity for forming the green embryo is formed between the upper mold core, the lower mold core, the first inclined slide assembly, the second inclined slide assembly, and the side slide assembly.

[0016] S3, connecting the feed port on the upper die base with the external raw material supply equipment, and allowing the molten fluid to flow into the runner structure and the side glue port through the feed port, so that the molten fluid flows into the molding cavity;

[0017] S4. After the green embryo is initially formed, the pressure is maintained for a period of time, and the upper die base and the lower die base are cooled by the cooling mechanism;

[0018] S5. Open the mold, separate the upper mold base and the lower mold base, and slide the first and second inclined slider assemblies outward of the molding cavity, and the side slider assemblies also slide outward of the molding cavity. Then, the ejection mechanism first lifts the push block, and then ejects the green embryo from the push block, so that the green embryo can be automatically discharged.

[0019] S6. Perform an appearance inspection on the overall structure of the green embryo. At the same time, perform a dimensional inspection to check whether the straight through holes and oblique through holes on the green embryo are properly formed, and then deal with any defects.

[0020] S7. After inspection and treatment, the green body is subjected to degreasing and sintering treatments in sequence to obtain a complete cylindrical part.

[0021] As a preferred solution of the powder metallurgy forming method with a slider in a slider, in step S1, the upper die base and the lower die base are cleaned to remove foreign matter such as dust and impurities.

[0022] As a preferred solution of the powder metallurgy forming method of the slider with a slider, in step S3, the mold temperature of the upper mold base and the lower mold base is heated to 100°C, the injection pressure is 220-230 MPa, and the injection speed is 75 s / ㎡.

[0023] As a preferred solution for the powder metallurgy forming method with a slider in a slider, in step S4, the holding pressure should be 110-130 MPa, and the holding time is 2 seconds; the cooling mechanism is a plurality of groups of first cold water pipes passing through the interior of the upper die base and a plurality of groups of second cold water pipes passing through the interior of the lower die base, and the plurality of groups of the first cold water pipes and the second cold water pipes are respectively connected end to end to form a first cooling channel and a second cooling channel. After the holding pressure is completed, the cooling is performed for 12 seconds through the cooling mechanism.

[0024] The beneficial effects of the present invention are:

[0025] By arranging the side slider assembly and the second oblique slider assembly, when the mold is closed, the upper mold core and the lower mold core are closed to form a molding cavity. Under the action of the side slider assembly, the first oblique slider assembly and the second oblique slider assembly, a green embryo is formed in the molding cavity, and the straight through hole and the oblique through hole in the green embryo are integrally molded by the side slider assembly and the second oblique slider assembly. There is no need to perform secondary machining on the oblique through hole, which avoids error accumulation, simplifies the processing steps of the green embryo, and thus ensures the processing accuracy of the straight through hole and the oblique through hole, thereby improving the production quality of the green embryo. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the overall structure of the cylindrical body;

[0027] Figure 2 This is a schematic diagram of the overall structure of a powder metallurgy forming die with a slider in the slider provided by the present invention;

[0028] Figure 3 A schematic diagram of the internal structure of a powder metallurgy forming die with a slider in a slider provided by the present invention;

[0029] Figure 4 A schematic diagram of the overall structure of the lower die base provided by the present invention;

[0030] Figure 5 A schematic diagram of the overall structure of the side slider assembly and the second oblique slider assembly provided by the present invention;

[0031] Figure 6 A schematic diagram of the overall structure of the forming block provided by the present invention;

[0032] Figure 7 A schematic top cross-sectional view of a forming block provided by the present invention;

[0033] Figure 8 A schematic diagram of the overall structure of the ejection mechanism provided by the present invention;

[0034] Figure 9 This is a schematic flow chart of the powder metallurgy forming method of the slider with slider provided by the present invention.

[0035] Among them, the reference numerals in the figures are:

[0036] 10. Upper die base; 11. Upper die core; 20. Lower die base; 21. Lower die core; 22. Push block; 221. First push rod; 23. Push plate; 24. First oblique slider assembly; 30. Side slider assembly; 31. Forming block; 311. First straight rod; 312. Second straight rod; 313. Third straight rod; 314. Fourth straight rod; 315. Fifth straight rod; 32. First slider seat; 33. First limit block; 34. Oil cylinder; 40. Second oblique slider assembly; 41. Second slider seat; 42. Second limit block; 43. First oblique rod; 44. Guide rod; 50. Ejector mechanism; 51. Rotating block; 52. Fixed plate; 53. Second push rod; 54. Press rod; 55. Ejecting sleeve; 60. Through hole; 61. Oblique through hole. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0038] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0041] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] In one embodiment of the present invention, Figure 2-8 As shown, a powder metallurgy forming die with a slider in a slider is provided, comprising an upper die base 10, a lower die base 20, and a side slider assembly 30. An upper die core 11 is housed within the upper die base 10. Two sets of first oblique slider assemblies 24, distributed left and right, are connected to the top of the upper die core 11. The lower die base 20 is disposed below the upper die base 10. A lower die core 21, corresponding to the upper die core 11, is housed within the lower die base 20. A push block 22 is disposed within the lower die core 21. A push plate 23 is disposed within the lower die base 20, and an ejection mechanism 50 is housed within the push plate 23. One end of the ejection mechanism 50 is connected to the bottom end of the push block 22. The side slider assembly 30 is disposed on one side of the lower die core 21 and is used to form a through hole 60 in the green preform. Two sets of forming blocks 31, distributed left and right, are disposed on the side of the side slider assembly 30 near the upper die core 11 and are slidably connected to the lower die base 20. Two sets of second oblique slider assemblies 40, distributed left and right, are disposed on the side slider assembly 30. The two sets of second oblique slider assemblies 40 are slidably connected to the side slider assemblies 30 and are used to form the oblique through holes 61 of the green embryo.

[0043] In this embodiment, the upper mold base 10 comprises a top plate and an upper mold plate, arranged sequentially from top to bottom. Injection channels are provided through the top plate and upper mold plate, and a feed port for connecting to an external material supply is located between the injection channel and the top of the top plate. A runner structure is provided at the top of the upper mold plate, corresponding to the injection channel. Branch runners are located on either side of the runner structure, each connected to the molding cavity. These branch runners use side ports to inject the molten fluid into the molding cavity.

[0044] The first inclined slide assembly 24 includes a third stopper and a second inclined rod. The third stopper is fixed to the bottom surface of the top plate and is slidably connected to one end of the second inclined rod. The third stopper and the second inclined rod are arranged at an angle. The second inclined rod is arranged at an angle at the top of the upper mold core 11.

[0045] By providing the side slider assembly 30 and the second oblique slider assembly 40, when the mold is closed, the upper mold core 11 and the lower mold core 21 are closed to form a molding cavity. Under the action of the side slider assembly 30, the first oblique slider assembly 24 and the second oblique slider assembly 40, a green embryo is formed in the molding cavity, and the straight through hole 60 and the oblique through hole 61 in the green embryo are integrally formed by the side slider assembly 30 and the second oblique slider assembly 40. There is no need to perform secondary machining on the oblique through hole, which avoids error accumulation, simplifies the processing steps of the green embryo, and thus ensures the processing accuracy of the straight through hole 60 and the oblique through hole 61, thereby improving the production quality of the green embryo.

[0046] Preferably, the side slider assembly 30 includes a first slider seat 32, a first limit block 33, and a cylinder 34. The cylinder 34 is fixed to the outside of the lower die base 20, and the output end of the cylinder 34 is connected to one end of the first slider seat 32. The first slider seat 32 is slidably connected to the lower die base 20, and the other end of the first slider seat 32 abuts against one side of the lower die core 21, and the forming unit is located between the first slider seat 32 and the lower die core 21. The first limit block 33 is arranged in the upper die base 10, and one side of the bottom end of the first limit block 33 abuts against the side surface of the other end of the first slider seat 32. When closing the mold, the cylinder 34 is started, and the cylinder 34 drives the first slider seat 32 to move to the side of the lower die core 21 and abut against the lower die core 21. At this time, the first limit block 33 moves downward, and one side of the bottom end of the first limit block 33 abuts against the side surface of the other end of the first slider seat 32, thereby limiting the position of the first slider seat 32.

[0047] Furthermore, a first straight rod 311, a second straight rod 312, a third straight rod 313, a fourth straight rod 314, and a fifth straight rod 315 are circumferentially disposed within the molding block 31. One end of the fifth straight rod 315 is connected to one end of the first inclined slider assembly 24. The arrangement of the first straight rod 311, the second straight rod 312, the third straight rod 313, the fourth straight rod 314, and the fifth straight rod 315 enables the formation of the through hole 60 and the groove at the top of the green body during injection molding. Furthermore, the provision of the first inclined slider assembly 24 allows the inclined hole within the through hole 60 to be formed simultaneously with the through hole 60, simplifying the processing steps, improving the production precision of the cylindrical body, and enhancing the production efficiency of the cylindrical body.

[0048] Specifically, the second inclined slider assembly 40 includes a second slider seat 41 and a second limit block 42. The first slider seat 32 is provided with two sets of equally spaced inclined slide grooves, which are arranged at an angle. The second slider seat 41 is slidably connected in the inclined slide groove, and one end of the second slider seat 41 is connected to the first inclined rod 43. One end of the first inclined rod 43 is sequentially passed through the first slider seat 32, the forming block 31, the third support rod and the fourth straight rod 314. The second limit block 42 is arranged in the upper mold seat 10, and the second limit block 42 is located above the second slider seat 41. The second limit block 42 and the second slider seat 41 are connected by an inclined guide rod 44. When the mold is closed, when the side slider collides with the lower mold core 21, the second slider seat 41 moves toward the inclined slide groove close to one end of the lower mold core 21 under the action of the guide rod 44, and moves to the extreme position of the inclined slide groove, so that the first inclined rod 43 is inserted into the first slider seat 32, the forming block 31, the third support rod and the fourth straight rod 314, so that the straight through hole 60 and the inclined through hole 61 can be formed at the same time during the green mold forming, simplifying the processing steps, improving the production accuracy of the columnar body, and improving the production efficiency of the columnar body, and the second sliding seat is in conflict with the bottom end of the second limit block 42, thereby limiting the position of the second slider seat 41.

[0049] Preferably, three sets of equally spaced first push rods 221 are provided at the bottom of the push block 22. Two sets of ejection mechanisms 50 are provided, one on each side of the bottom of the push block 22, and the other located between two adjacent sets of first push rods 221. When the mold is opened, the push plate 23 pushes upward, driving the first push rods 221 and the ejection mechanism 50 upward together. The first push rods 221 first eject the push block 22, and then the ejection mechanism 50 ejects the green embryo within the push block 22, thereby achieving automatic discharge of the green embryo. Furthermore, this secondary ejection can reduce surface damage to the green embryo during ejection, improving the production quality of the green embryo.

[0050] Furthermore, the ejection mechanism 50 includes a rotating block 51, a fixed plate 52, and a second push rod 53. The rotating block 51 is rotatably connected to the push plate 23 via a rotating shaft. The fixed plate 52 is disposed on the surface of the push plate 23 and above the rotating block 51. A pressure rod 54 is disposed between the rotating block 51 and the fixed plate 52. One end of the second push rod 53 is fixed to the rotating block 51, and the other end of the second push rod 53 passes through the fixed plate 52 and extends into the push block 22. A lifting sleeve 55 is disposed between the second push rod 53 and the push block 22. As the push plate 23 continues to move upward, the top end of the pressure rod 54 on the fixed plate 52 contacts the lower die base 20, causing the pressure rod 54 to move downward. The pressure rod 54 drives the rotating block 51 to rotate, which in turn lifts the second push rod 53 upward, thereby driving the lifting sleeve 55 and the second push rod 53 to eject the green embryo from the push block 22, thereby achieving automatic ejection of the green embryo.

[0051] In one embodiment of the present invention, Figure 9As shown, a powder metallurgy forming method of a slider with a slider is provided, and the powder metallurgy forming die of the slider with a slider is applied, comprising the following steps:

[0052] S1. Adjust the upper die base 10 and the lower die base 20 to ensure they are aligned. During adjustment, clean the upper die base 10 and the lower die base 20 to remove dust, impurities, and other foreign matter. This ensures the cleanliness of the interior of the upper die base 10 and the lower die base 20 to ensure the molding effect of the green preform. Furthermore, the opening and closing stroke between the upper die base 10 and the lower die base 20 is fine-tuned according to the different specifications of the cylindrical body to ensure that the upper die base 10 and the lower die base 20 can fully open and close the mold, thereby preventing damage to the powder metallurgy forming mold due to insufficient opening and closing stroke between the upper die base 10 and the lower die base 20.

[0053] At the same time, the upper die base 10 and the lower die base 20 are calibrated to avoid deviation between the upper die base 10 and the lower die base 20 and ensure the molding quality of the green embryo.

[0054] S2. The molds are closed. The upper mold base 10 approaches the lower mold base 20. The side slide assembly 30 slides to the side of the lower mold core 21 and contacts it. Subsequently, the first inclined slide assembly 24 moves to the top of the upper mold core 11, contacting it. Simultaneously, the second inclined slide assembly 40 moves to the end of the side slide assembly 30 near the lower mold core 21. A molding cavity for molding the green mold is formed between the upper mold core 11, the lower mold core 21, the first inclined slide assembly 24, the second inclined slide assembly 40, and the side slide assembly 30.

[0055] S3. Connect the feed port on the upper mold base 10 with the external raw material supply equipment, and let the molten fluid flow into the runner structure and the side glue port through the feed port, so that the molten fluid flows into the molding cavity.

[0056] The upper and lower mold bases 10 and 20 are heated to 100°C, with an injection pressure of 220-230 MPa and an injection speed of 75 seconds per square meter. During molten fluid injection, the mold temperature of the upper and lower mold bases 10 and 20 is controlled within 100°C, ensuring optimal flow of the molten fluid into the molding cavity. This prevents solidification, which could affect the molding quality of the green preform, and improves green preform production quality.

[0057] S4. After the green embryo is initially formed, the pressure is maintained for a period of time, and the upper die base 10 and the lower die base 20 are cooled by a cooling mechanism.

[0058] The holding pressure should be 110-130 MPa, and the holding time is 2 seconds. The holding pressure replenishes the molten fluid in the molding cavity, making the molding of the green embryo more complete and avoiding the phenomenon of insufficient material or incompleteness. After the holding pressure is completed, the green embryo is cooled for 12 seconds by a cooling mechanism. The cooling mechanism comprises multiple sets of first cold water pipes passing through the interior of the upper mold base 10 and multiple sets of second cold water pipes passing through the interior of the lower mold base 20. The multiple sets of first cold water pipes and second cold water pipes are connected end to end to form a first cooling channel and a second cooling channel. The first cooling channel and the second cooling channel are respectively located in the upper mold base 10 and the lower mold base 20, and the first cooling channel and the second cooling channel are respectively located outside the molding cavity. By injecting external cold water into the first cooling channel and the second cooling channel, the molding cavity is cooled and cooled, so that the green embryo can be quickly cooled after molding, thereby improving the molding efficiency and cooling efficiency of the green embryo.

[0059] S5: The mold is opened, and the upper mold base 10 and lower mold base 20 are separated. The first and second inclined slider assemblies 24 and 40 slide outward from the molding cavity, and the side slider assembly 30 also slides outward from the molding cavity. The ejection mechanism then lifts the push block 22 and ejects the green embryo from the push block 22, allowing the green embryo to be automatically discharged. During mold opening, the ejection mechanism ejects the green embryo twice, preventing damage to the green embryo surface and ensuring the production quality of the green embryo.

[0060] S6. The overall structure of the green embryo is visually inspected. The straight and oblique through-holes are also dimensionally inspected to ensure they are properly formed. Any defects are then addressed. The green embryo is classified based on surface integrity, either as good or defective. Good embryos are further classified based on the presence of burrs, either as qualified or trimmed. Trimmed embryos are trimmed of burrs and then transferred to the next processing step along with the qualified embryos.

[0061] S7. After inspection and processing, the green body is degreased and sintered in sequence to obtain a complete cylindrical part. The green body is degreased and plasticized to remove organic matter in the green body, and then sintered in a sintering furnace to obtain a complete cylindrical part.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are all within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A powder metallurgy forming die with a slider in a slider, characterized in that: include: An upper die base, wherein an upper die core is provided in the upper die base; the top of the upper die core is connected to two groups of first inclined sliding block assemblies distributed on the left and right; A lower die base is provided below the upper die base; a lower die core corresponding to the upper die core is provided in the lower die base; a push block is provided in the lower die core; a push plate is provided in the lower die base, an ejection mechanism is provided in the push plate, and one end of the ejection mechanism is connected to the bottom end of the push block; A side slider assembly is provided on one side of the lower mold core and is used for forming straight through holes in the green embryo; the side slider assembly is provided with two groups of forming blocks distributed left and right on the side close to the upper mold core, and is slidably connected to the lower mold base; the side slider assembly is provided with two groups of second inclined slider assemblies distributed left and right; two groups of the second inclined slider assemblies are slidably connected to the side slider assembly and are used for forming inclined through holes in the green embryo.

2. The powder metallurgy forming die with a slider in a slider according to claim 1, characterized in that: The side slider assembly includes a first slider seat, a first limit block and a cylinder; the cylinder is fixed to the outside of the lower die seat, and the output end of the cylinder is connected to one end of the first slider seat; the first slider seat is slidably connected to the lower die seat, the other end of the first slider seat is in conflict with one side of the lower die core, and the forming block is located between the first slider seat and the lower die core; the first limit block is arranged in the upper die seat, and one side of the bottom end of the first limit block is in conflict with the side surface of the other end of the first slider seat.

3. The powder metallurgy forming die with a slider in a slider according to claim 2, characterized in that: A first straight rod, a second straight rod, a third straight rod, a fourth straight rod and a fifth straight rod are provided in the inner circumference of the forming block; one end of the fifth straight rod is connected to one end of the first inclined sliding block assembly.

4. The powder metallurgy forming die with a slider in a slider according to claim 3, characterized in that: The second inclined slider assembly includes a second slider seat and a second limit block; the first slider seat is provided with two groups of equally spaced inclined slide grooves, and the inclined slide grooves are arranged at an angle; the second slider seat is slidably connected to the inclined slide groove, and one end of the second slider seat is connected to the first inclined rod; one end of the first inclined rod is sequentially passed through the first slider seat, the forming block, the third support rod and the fourth straight rod; the second limit block is arranged in the upper mold seat, and the second limit block is located above the second slider seat; the second limit block and the second slider seat are connected by an inclined guide rod.

5. The powder metallurgy forming die with a slider in a slider according to claim 1, characterized in that: The bottom end of the push block is provided with three groups of first push rods distributed at equal intervals; the ejection mechanism is provided in two groups, the two groups of ejection mechanisms are distributed on the left and right sides of the bottom end of the push block, and the ejection mechanism is located between two adjacent groups of the first push rods.

6. The powder metallurgy forming die with a slider in a slider according to claim 5, characterized in that: The ejection mechanism includes a rotating block, a fixed plate and a second push rod; the rotating block is rotatably connected to the push plate through a rotating shaft; the fixed plate is arranged on the surface of the push plate and is located above the rotating block; a pressure rod is provided between the rotating block and the fixed plate; one end of the second push rod is fixed in the rotating block, and the other end of the second push rod is passed through the fixed plate and extends into the push block; a lifting sleeve is provided between the second push rod and the push block.

7. A powder metallurgy forming method of a slider-within-a-slider, using the powder metallurgy forming die of the slider-within-a-slider according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Debug the upper die base and the lower die base to make them docked, and calibrate them at the same time; S2. The mold is closed. The upper mold base approaches the lower mold base. The side slide assembly slides to the side of the lower mold core and contacts the lower mold core. Subsequently, the first inclined slide assembly moves to the top of the upper mold core, and the two contact each other. At the same time, the second inclined slide assembly moves to the side slide assembly close to the lower mold core. A molding cavity for forming the green embryo is formed between the upper mold core, the lower mold core, the first inclined slide assembly, the second inclined slide assembly, and the side slide assembly. S3, connecting the feed port on the upper die base with the external raw material supply equipment, and allowing the molten fluid to flow into the runner structure and the side glue port through the feed port, so that the molten fluid flows into the molding cavity; S4. After the green embryo is initially formed, the pressure is maintained for a period of time, and the upper die base and the lower die base are cooled by the cooling mechanism; S5. Open the mold, separate the upper mold base and the lower mold base, and slide the first and second inclined slider assemblies outward of the molding cavity, and the side slider assemblies also slide outward of the molding cavity. Then, the ejection mechanism first lifts the push block, and then ejects the green embryo from the push block, so that the green embryo can be automatically discharged. S6. Perform an appearance inspection on the overall structure of the green embryo. At the same time, perform a dimensional inspection to check whether the straight through holes and oblique through holes on the green embryo are properly formed, and then deal with any defects. S7. After inspection and treatment, the green body is subjected to degreasing and sintering treatments in sequence to obtain a complete cylindrical part.

8. The powder metallurgy forming method of a slider-in-slider according to claim 7, characterized in that: In step S1, the upper die base and the lower die base are cleaned to remove dust, impurities and other foreign matter.

9. The powder metallurgy forming method of a slider-in-slider according to claim 7, characterized in that: In step S3, the mold temperature of the upper mold base and the lower mold base is heated to 100° C., the injection pressure is 220-230 MPa, and the injection speed is 75 s / m2.

10. The powder metallurgy forming method of a slider-in-slider according to claim 7, characterized in that: In step S4, the holding pressure is to be 110-130 MPa, and the holding time is 2 seconds. The cooling mechanism comprises a plurality of first cold water pipes passing through the interior of the upper die base and a plurality of second cold water pipes passing through the interior of the lower die base. The plurality of first cold water pipes and second cold water pipes are connected end to end to form a first cooling channel and a second cooling channel. After the holding pressure is completed, the cooling is performed for 12 seconds through the cooling mechanism.

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