High-precision continuous pressing and forming device and method for a powder metallurgy blank with an internal sink

Abstract

The present invention discloses a high-precision continuous pressing and forming device and method for a powder metallurgy blank with an internal sink. The present invention relates to the technical field of pressing and forming a powder metallurgy blank with an internal sink. It includes a hydraulic motor fixedly arranged on the bottom surface of a workbench. The output shaft of the hydraulic motor penetrates the workbench upward, and a rotating table supported on the workbench surface is fixedly arranged on the extending end. Pressing assemblies B and A for pressing metal powder are respectively arranged at the left and right ends of the rotating table. The beneficial effects of the present invention are: greatly improving the pressing quality of the powder metallurgy blank and greatly improving the pressing and forming efficiency of the powder metallurgy blank.

Description

Technical Field

[0001] The present invention relates to the technical field of powder metallurgy billets with inner sunk grooves formed by pressing, in particular to a high-precision continuous pressing and forming device and method for powder metallurgy billets with inner sunk grooves. Background Art

[0002] The structure of a certain powder metallurgy billet M with inner sunk grooves is as Figures 1 - 2 shown. The overall shape of the powder metallurgy billet M1 is circular. Inner sunk grooves 2 with a rectangular cross-section are formed on the left and right cylindrical surfaces of the powder metallurgy billet M1. The two inner sunk grooves 2 are symmetric with each other left and right, and both of the two inner sunk grooves 2 are in a horizontal state. The two inner sunk grooves 2 are used for inserting rods for transmission.

[0003] This kind of powder metallurgy billet M1 is pressed from a certain amount of metal powder by a pressing and forming device. After pressing out a batch of powder metallurgy billets M1 as Figures 1 - 2 shown, workers put these powder metallurgy billets M1 into a sintering furnace, and sinter the powder metallurgy billets M1 through the sintering furnace. After sintering is completed, high-strength mechanical parts are obtained.

[0004] In a certain workshop, a pressing and forming device as Figure 3 shown is used to press out the required number of powder metallurgy billets M1. The pressing and forming device includes a gantry 3 fixed on a bottom plate, columns 4 fixed on the top surface of the bottom plate, and two jacking oil cylinders 5. The two jacking oil cylinders 5 are respectively located on the left and right sides of the column 4. A jacking plate 6 is welded between the acting ends of the piston rods of the two jacking oil cylinders 5. A vertically arranged mold 7 is welded in the jacking plate 6. The inner cavity 8 of the mold 7 penetrates through the top and bottom surfaces of the mold 7, and the inner cavity 8 of the mold 7 is sleeved on the upper end of the column 4;

[0005] On the top surface of the jacking plate 6, two horizontal oil cylinders 9 are respectively fixed on the left and right sides of the mold 7. On the acting ends of the piston rods of the two horizontal oil cylinders 9, strip-shaped blocks 10 are fixed. The inner ends of the strip-shaped blocks 10 extend into the inner cavity 8 of the mold 7, and the two strip-shaped blocks 10 are opposite to each other left and right; on the top surface of the cross beam of the gantry 3, a pressing oil cylinder 11 is fixed. The piston rod of the pressing oil cylinder 11 penetrates downward through the cross beam, and a pressure head 12 is connected to the extending end. The pressure head 12 is located directly above the inner cavity 8 of the mold 7.

[0006] The method for workers in the workshop to press out the powder metallurgy billet M1 by using this pressing and forming device is as follows:

[0007] Sa. Workers pour the weighed metal powder from top to bottom into the inner cavity 8 of the mold 7, and the pouring direction is as Figure 4 shown by the arrow in. At this time, the metal powder supports on the top surface of the column 4 and covers the inner ends of the two strip-shaped blocks 10, so as to fill the inner cavity 8 of the mold 7 with metal powder;

[0008] Sb. The piston rod of the worker-controlled pressing oil cylinder 11 extends downward, and the piston rod drives the pressing head 12 to move downward. The pressing head 12 extends downward from top to bottom into the inner cavity 8 of the mold 7 and gradually presses the metal powder. Under the pressure, the metal powder becomes dense; when the piston rod of the pressing oil cylinder 11 is fully extended, the first powder metallurgy blank M1 can be pressed and formed, as Figures 5 - 6 shown. The structure of the pressed powder metallurgy blank M1 is as Figures 1 - 2 shown;

[0009] Sc. The removal of the first powder metallurgy blank M1. The specific operation steps are as follows:

[0010] Sc1. Control the piston rods of the two horizontal oil cylinders 9 to retract. The piston rods drive the strip-shaped blocks 10 to move outward, and the strip-shaped blocks 10 gradually withdraw from the inside of the powder metallurgy blank M1. When the piston rods of the horizontal oil cylinders 9 are fully retracted, the strip-shaped blocks 10 can be completely withdrawn from the inside of the powder metallurgy blank M1, as Figure 7 shown;

[0011] Sc2. Control the piston rod of the pressing oil cylinder 11 to retract upward. The piston rod drives the pressing head 12 to retract upward to reset the pressing head 12; then control the piston rods of the two jacking oil cylinders 5 to retract downward. The piston rods drive the jacking plate 6 to move downward, and the jacking plate 6 drives the horizontal oil cylinders 9 and the mold 7 to move downward relative to the stationary powder metallurgy blank M1; when the piston rods of the jacking oil cylinders 5 are fully retracted, the powder metallurgy blank M1 is just exposed outside the mold 7, as Figure 8 shown. At this time, the worker takes away the powder metallurgy blank M1, and the taking-away direction is as Figure 8 shown by the arrow in

[0012] Sd. The worker repeats the operations of steps Sa to Sc multiple times, and multiple powder metallurgy blanks M1 can be continuously pressed and formed.

[0013] However, although this pressing and forming equipment can press out the required powder metallurgy blank M1, in the actual application process, the following technical defects are often reflected:

[0014] I. In step Sb, since the inner ends of the two strip-shaped blocks 10 are in a suspended state, when the pressing head 12 presses the metal powder, the pressure of the pressing head 12 will be transmitted to the inner ends of the two strip-shaped blocks 10, causing the inner ends of the two strip-shaped blocks 10 to bend and deform downward. The deformation direction of the inner ends of the strip-shaped blocks 10 is as Figure 6As shown by the arrow, the two inner sinking grooves 2 of the powder metallurgy blank M1 pressed out are in an inclined state (while the process requires that the two inner sinking grooves 2 of the powder metallurgy blank M1 pressed out are in a horizontal state), which undoubtedly reduces the pressing and forming quality of the powder metallurgy blank M1 and has the technical defect of low pressing accuracy. The powder metallurgy blank M1 pressed and formed cannot meet the requirements of high-end customers.

[0015] II. In steps Sa to Sd, only after the worker fills the inner cavity 8 of the mold 7 with metal powder can a powder metallurgy blank M1 be pressed out. That is to say, this kind of pressing and forming equipment can only press out powder metallurgy blanks M1 one by one and cannot continuously press out powder metallurgy blanks M1. And the customer needs 200 - 211 powder metallurgy blanks M1 every day. This undoubtedly causes a long time to be consumed to press out the required number of powder metallurgy blanks M1, thus reducing the pressing and forming efficiency of the powder metallurgy blank M1.

[0016] Therefore, there is an urgent need for a high-precision continuous pressing and forming device and method that can greatly improve the pressing and forming quality of powder metallurgy blanks and greatly improve the pressing and forming efficiency of powder metallurgy blanks. Summary of the Invention

[0017] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a high-precision continuous pressing and forming device and method for powder metallurgy blanks with inner sinking grooves that can greatly improve the pressing quality of powder metallurgy blanks and greatly improve the pressing and forming efficiency of powder metallurgy blanks.

[0018] The purpose of the present invention is achieved by the following technical solutions: A high-precision continuous pressing and forming device for powder metallurgy blanks with inner sinking grooves, which includes a hydraulic motor fixed on the bottom surface of the workbench. The output shaft of the hydraulic motor penetrates the workbench upward, and a rotating table supported on the workbench surface is fixed on the extending end. Pressing assembly B and pressing assembly A for pressing metal powder are respectively arranged at the left and right ends of the rotating table;

[0019] The pressing assembly A located at the right end of the rotating table includes an L-shaped support and a cushion block fixed on the rotating table. A vertical through groove and a horizontal through groove are respectively opened in the vertical seat and the horizontal seat of the L-shaped support. Two lifting cylinders are fixed on the top surface of the L-shaped support, respectively located on the left and right sides of the horizontal through groove. The piston rods of the two lifting cylinders penetrate the horizontal seat downward, and lifting seats are fixedly connected to the extending ends. A guide rod slidably penetrates through the right lifting seat, and a feeding cylinder penetrating the vertical through groove to the left is fixed on the left end surface of the left lifting seat. A frame is welded between the acting end of the piston rod of the feeding cylinder and the left end of the guide rod;

[0020] In the middle of the frame, a mold penetrating the top and bottom surfaces of the frame is welded. Two horizontal oil cylinders are fixedly arranged in the frame, respectively located on the left and right sides of the mold. Strip-shaped blocks are fixedly arranged on the acting ends of the piston rods of the two horizontal oil cylinders. The inner ends of the two strip-shaped blocks extend into the inner cavity of the mold; on the top surface of the frame, a support penetrating the horizontal through groove upward is fixedly arranged. On the top wall of the support, a first pressurizing oil cylinder is fixedly arranged. On the acting end of the piston rod of the first pressurizing oil cylinder, a first pressurizing block located directly above the mold is fixedly arranged.

[0021] On the top surface of the cushion block, a column located directly below the mold is fixedly arranged. On the top surface of the cushion block, two vertical oil cylinders located on the right side of the column are also fixedly arranged. A docking mold is fixedly arranged between the acting ends of the piston rods of the two vertical oil cylinders. A stepped groove penetrating the top and bottom surfaces of the docking mold is opened in the docking mold. On the bottom surface of the docking mold, a second pressurizing oil cylinder is fixedly arranged. The piston rod of the second pressurizing oil cylinder extends into the small groove of the stepped groove, and a second pressurizing block slidably matched with the stepped groove is fixedly arranged on the extending end.

[0022] On the bottom surface of the workbench, a plurality of legs supporting on the ground are fixedly arranged.

[0023] The pressing assembly A and the pressing assembly B are symmetrically arranged about the hydraulic motor left and right.

[0024] A guide hole is opened in the lifting seat on the right side. The guide rod is slidably matched with the guide hole.

[0025] The two horizontal oil cylinders are symmetrically arranged about the mold left and right. The two strip-shaped blocks are symmetrically arranged about the mold left and right. The cross section of the strip-shaped block is rectangular.

[0026] The outer contour of the first pressurizing block is matched with the inner cavity of the mold. The diameter of the first pressurizing block is equal to the diameter of the second pressurizing block; the column is matched with the inner cavity of the mold; the large groove of the stepped groove is matched with the outer contour of the mold.

[0027] On the top surface of the cushion block, two vertical oil cylinders are fixedly arranged. An installation plate is fixedly arranged between the acting ends of the piston rods of the two vertical oil cylinders. The docking mold is welded to the middle of the installation plate and penetrates the top and bottom surfaces of the installation plate.

[0028] This high-precision continuous pressing and forming device further includes a controller, which is electrically connected to the hydraulic motor, the lifting oil cylinder, the feeding oil cylinder, the horizontal oil cylinder, the first pressurizing oil cylinder, the vertical oil cylinder, and the second pressurizing oil cylinder via signal lines.

[0029] A method for high-precision continuous pressing and forming of a powder metallurgy blank with an inner sunk groove includes the following steps:

[0030] S1. Fill the pressing assembly A with metal powder. The specific operation steps are as follows:

[0031] S11. The worker stands at the front side of the workbench and drops a weighed portion of metal powder from top to bottom into the stepped groove of the docking die of the pressing assembly A. After the dropping is completed, this portion of metal powder is supported on the top surface of the second pressing block, and the small groove of the stepped groove is filled;

[0032] S12. Control the piston rods of the two lifting cylinders of the pressing assembly A to extend downward simultaneously. The piston rods drive the lifting seats to move downward. The lifting seat on the left drives the feeding cylinder to move downward. At the same time, the lifting seat on the right drives the guide rod to move downward, thereby driving the frame to move downward synchronously. The frame drives the die, the first pressing cylinder, the two horizontal cylinders, and the two strip blocks to move downward synchronously. When the piston rods of the lifting cylinders extend to the set stroke, the controller controls the lifting cylinders to close. At this time, the lower end of the inner cavity of the die just sleeves outside the column, and the top surface of the column contacts the bottom surfaces of the inner ends of the two strip blocks;

[0033] S13. The worker drops another weighed portion of metal powder from top to bottom into the inner cavity of the die of the pressing assembly A. After the dropping is completed, this portion of metal powder is supported on the top surface of the column and covers the inner ends of the two strip blocks, thus finally filling the metal powder into the pressing assembly A;

[0034] S2. The worker controls the hydraulic motor to start. The output shaft of the hydraulic motor drives the rotating table to rotate on the horizontal plane close to the tabletop of the workbench. The rotating table drives the pressing assembly A and the pressing assembly B to rotate synchronously. When the rotating table rotates 180°, the controller controls the hydraulic motor to close. At this time, the pressing assembly A moves to the left side of the workbench, and the pressing assembly B moves to the right side of the workbench. The worker repeats the operation of step S1 once to fill the metal powder into the pressing assembly B;

[0035] S3. Press and form the first powder metallurgy blank N through the pressing assembly A. The specific operation steps are as follows:

[0036] S31. Control the piston rod of the first pressing cylinder of the pressing assembly A to extend downward. The piston rod drives the first pressing block to move downward. The first pressing block extends into the inner cavity of the die from top to bottom and gradually presses the metal powder. Under the pressure, the metal powder becomes dense; when the piston rod of the first pressing cylinder extends to the set stroke, the controller controls the first pressing cylinder to close, thereby pressing the metal powder in the die into an upper semi-blank with two inner sinking grooves;

[0037] S32. Control the piston rods of the two lifting cylinders of the pressing assembly A to retract upward simultaneously. The piston rods drive the lifting seats to move upward, and then drive the frame to move upward synchronously. The frame drives the mold, the first pressing cylinder, the two horizontal cylinders, and the two strip blocks to move upward synchronously. The mold gradually disengages from the column. At the same time, the mold also drives the upper semi-blank to move upward synchronously. When the piston rods of the lifting cylinders are fully retracted, the mold just moves directly above the column.

[0038] S33. Control the piston rod of the feeding cylinder of the pressing assembly A to extend leftward. The piston rod drives the frame to move leftward. The frame drives the mold, the first pressing cylinder, the two horizontal cylinders, and the two strip blocks to move leftward synchronously. The mold drives the upper semi-blank to move leftward synchronously. When the piston rod of the feeding cylinder is fully extended, the mold just moves directly above the step groove of the docking mold.

[0039] S34. Control the piston rods of the two vertical cylinders of the pressing assembly A to extend upward. The piston rods drive the mounting plate to move upward. The mounting plate drives the docking mold to move upward. The docking mold drives the second pressing cylinder, the second pressing block, and the metal powder inside it to move upward synchronously. When the piston rods of the vertical cylinders are fully extended, the large groove of the docking mold just sleeves the lower end of the mold, and the step groove of the docking mold is connected to the inner cavity of the mold.

[0040] S35. Control the piston rod of the second pressing cylinder of the pressing assembly A to extend upward. The piston rod drives the second pressing block to move upward. The second pressing block pushes the metal powder in the docking mold upward into the inner cavity of the mold. Under the gradual pressing of the second pressing block, the metal powder is gradually pressed onto the upper semi-blank. When the piston rod of the second pressing cylinder extends to the set stroke, the controller controls the second pressing cylinder to close, thereby pressing the metal powder in the docking mold into the lower semi-blank connected to the upper semi-blank. The lower semi-blank and the upper semi-blank together form the powder metallurgy blank N, and finally, the first powder metallurgy blank N with two inner sinking grooves is pressed and formed through the pressing assembly A.

[0041] S4. Removal of the first powder metallurgy blank N. The specific operation steps are as follows:

[0042] S41. Control the piston rods of the two horizontal cylinders of the pressing assembly A to retract. The piston rods drive the strip blocks to move outward. The strip blocks gradually withdraw from the powder metallurgy blank N. When the piston rods of the horizontal cylinders are fully retracted, the strip blocks can be completely withdrawn from the powder metallurgy blank N.

[0043] S42. Control the piston rod of the first pressing cylinder of the pressing assembly A to retract upward. The piston rod drives the first pressing block to move upward. The first pressing block first separates from the powder metallurgy blank N and then withdraws from the inner cavity of the mold.

[0044] S43. Control the piston rod of the second pressurizing oil cylinder of the pressing assembly A to extend upward. The piston rod drives the second pressing block to move upward, and the second pressing block pushes the powder metallurgy blank N upward. When the piston rod of the second pressurizing oil cylinder is fully extended, the powder metallurgy blank N is just pushed out of the mold by the second pressing block. At this time, the worker takes away the powder metallurgy blank N.

[0045] S5. The worker controls the hydraulic motor to start. The output shaft of the hydraulic motor drives the rotating table to rotate on the horizontal plane close to the tabletop of the workbench. The rotating table drives the pressing assembly A and the pressing assembly B to rotate synchronously. When the rotating table rotates 180°, the controller controls the hydraulic motor to shut down. At this time, the pressing assembly A moves to the right side of the workbench, and the pressing assembly B moves to the left side of the workbench; then the worker fills new metal powder into the pressing assembly A again, and then the worker repeats the operations of steps S3 - S4 once, so as to press out the second powder metallurgy blank N through the pressing assembly B.

[0046] S6. The worker repeats the operation of step S5 many times like this, and then the required number of powder metallurgy blanks N can be continuously and uninterruptedly pressed and formed by the alternately working pressing assembly A and pressing assembly B.

[0047] The present invention has the following advantages: greatly improving the pressing quality of the powder metallurgy blank and greatly improving the pressing and forming efficiency of the powder metallurgy blank. Description of the Drawings

[0048] Figure 1 Isometric view of the powder metallurgy blank M;

[0049] Figure 2 For Figure 1 Main sectional schematic diagram;

[0050] Figure 3 Structural schematic diagram of the pressing and forming equipment used in a certain workshop;

[0051] Figure 4 Schematic diagram of filling the inner cavity of the mold of the pressing and forming equipment with metal powder;

[0052] Figure 5 Schematic diagram of the pressing and forming equipment pressing and forming the first powder metallurgy blank M;

[0053] Figure 6 For Figure 5 Partial enlarged view of part I;

[0054] Figure 7 Schematic diagram of the two strip-shaped blocks completely withdrawing from the powder metallurgy blank M in the pressing and forming equipment;

[0055] Figure 8 Schematic diagram of the powder metallurgy blank M exposed outside the mold;

[0056] Figure 9 is the structural schematic diagram of the present invention;

[0057] Figure 10 is Figure 9 the main sectional schematic diagram of;

[0058] Figure 11 is the structural schematic diagram of the pressing assembly A;

[0059] Figure 12 is Figure 11 the main sectional schematic diagram of;

[0060] Figure 13 is the structural schematic diagram of the L-shaped support;

[0061] Figure 14 is Figure 13 the main sectional schematic diagram of;

[0062] Figure 15 is Figure 12 the connection schematic diagram of the feed oil cylinder, frame, mold and the first pressing oil cylinder in;

[0063] Figure 16 is Figure 12 the connection schematic diagram of the horizontal oil cylinder and the strip block in;

[0064] Figure 17 is the connection schematic diagram of the vertical oil cylinder, mounting plate, docking mold and the second pressing oil cylinder;

[0065] Figure 18 is Figure 17 the structural schematic diagram of the docking mold in;

[0066] Figure 19 is Figure 18 the main sectional schematic diagram of;

[0067] Figure 20 is the schematic diagram of adding a part of the weighed metal powder into the stepped groove of the docking mold of the pressing assembly A;

[0068] Figure 21 is the schematic diagram of the lower end part of the inner cavity of the mold sleeved outside the column;

[0069] Figure 22 is the schematic diagram of adding another part of the weighed metal powder into the inner cavity of the mold of the pressing assembly A;

[0070] Figure 23 is the schematic diagram of the pressing assembly A moving to the left side of the workbench;

[0071] Figure 24 is Figure 23 the partial enlarged view of part II of;

[0072] Figure 25 Schematic diagram of the first pressing block pressing the metal powder in the mold into the upper semi-workpiece

[0073] Figure 26 Axonometric view of the upper semi-workpiece

[0074] Figure 27 Is Figure 25 Main sectional view of

[0075] Figure 28 Is Figure 25 Bottom view of

[0076] Figure 29 Schematic diagram of the mold moving to directly above the column

[0077] Figure 30 Schematic diagram of the mold moving to directly above the stepped groove of the docking mold

[0078] Figure 31 Schematic diagram of the large groove of the docking mold sleeving on the lower end of the mold

[0079] Figure 32 Schematic diagram of the second pressing block pressing the metal powder in the docking mold into the lower semi-workpiece connected to the upper semi-workpiece as a whole

[0080] Figures 33 - 34 Axonometric view of the powder metallurgy workpiece N formed by pressing

[0081] Figures 33 - 34 Is Figures 33 - 34 Main sectional view of

[0082] Figure 35 Schematic diagram of the strip block completely withdrawing from the powder metallurgy workpiece N

[0083] Figure 36 Schematic diagram of the first pressing block withdrawing from the inner cavity of the mold

[0084] Figure 37 Schematic diagram of the powder metallurgy workpiece N being pushed out of the mold by the second pressing block

[0085] In the figure:

[0086] 1 - Powder metallurgy workpiece M, 2 - Inner sunk groove, 3 - Gantry, 4 - Column, 5 - Jacking oil cylinder, 6 - Jacking plate, 7 - Mold, 8 - Inner cavity, 9 - Horizontal oil cylinder, 10 - Strip block, 11 - Pressing oil cylinder, 12 - Pressing head

[0087] 13 - Workbench, 14 - Hydraulic motor, 15 - Rotary table, 16 - Pressing assembly B, 17 - Pressing assembly A, 18 - L-shaped support, 19 - Spacer block, 20 - Vertical through groove, 21 - Horizontal through groove, 22 - Lifting oil cylinder, 23 - Lifting seat, 24 - Guide rod, 25 - Feeding oil cylinder, 26 - Frame, 27 - Support, 28 - First pressing oil cylinder, 29 - First pressing block;

[0088] 30 - Vertical oil cylinder, 31 - Docking die, 32 - Step groove, 33 - Second pressing oil cylinder, 34 - Second pressing block;

[0089] 35 - Upper semi-finished workpiece, 36 - Lower semi-finished workpiece, 37 - Powder metallurgy blank N. Specific implementation manner

[0090] The following further describes the present invention in conjunction with the accompanying drawings. The protection scope of the present invention is not limited to the following:

[0091] As Figures 9 - 19 shown, a high-precision continuous pressing and forming device for a powder metallurgy blank with an internal sunk groove includes a hydraulic motor 14 fixedly arranged on the bottom surface of the workbench 13. The output shaft of the hydraulic motor 14 axially penetrates the workbench 13 upward, and a rotary table 15 supported on the tabletop of the workbench 13 is fixedly arranged on the extending end. Pressing assemblies B 16 and A 17 for pressing metal powder are respectively arranged at the left and right ends of the rotary table 15; a plurality of legs supporting on the ground are fixedly arranged on the bottom surface of the workbench 13. The pressing assemblies A 17 and B 16 are symmetrically arranged about the hydraulic motor 14 left and right.

[0092] The pressing assembly A 17 located at the right end of the rotary table 15 includes an L-shaped support 18 and a spacer block 19 fixedly arranged on the rotary table 15. A vertical through groove 20 and a horizontal through groove 21 are respectively opened in the vertical seat and the horizontal seat of the L-shaped support 18. Two lifting oil cylinders 22 are fixedly arranged on the top surface of the L-shaped support 18, respectively located on the left and right sides of the horizontal through groove 21. The piston rods of the two lifting oil cylinders 22 all penetrate the horizontal seat downward, and lifting seats 23 are fixedly connected to the extending ends. A guide rod 24 slidably penetrates through the right lifting seat 23, and a guide hole is opened in the right lifting seat 23. The guide rod 24 is slidably matched with the guide hole. A feeding oil cylinder 25 penetrating the vertical through groove 20 to the left is fixedly arranged on the left end surface of the left lifting seat 23, and a frame 26 is welded between the acting end of the piston rod of the feeding oil cylinder 25 and the left end of the guide rod 24.

[0093] In the middle of the frame 26, a die 7 penetrating the top and bottom surfaces of the frame 26 is welded. Two horizontal oil cylinders 9 are fixedly arranged inside the frame 26, respectively located on the left and right sides of the die 7. Bar-shaped blocks 10 are fixedly arranged on the acting ends of the piston rods of the two horizontal oil cylinders 9. The inner ends of the two bar-shaped blocks 10 extend into the inner cavity 8 of the die 7; on the top surface of the frame 26, a support 27 penetrating the horizontal through groove 21 upward is fixedly arranged. On the top wall of the support 27, a first pressurizing oil cylinder 28 is fixedly arranged. On the acting end of the piston rod of the first pressurizing oil cylinder 28, a first pressurizing block 29 located directly above the die 7 is fixedly arranged; the two horizontal oil cylinders 9 are symmetric about the left and right of the die 7, the two bar-shaped blocks 10 are symmetric about the left and right of the die 7, and the cross section of the bar-shaped block 10 is rectangular.

[0094] On the top surface of the cushion block 19, a column 4 located directly below the die 7 is fixedly arranged. On the top surface of the cushion block 19, two vertical oil cylinders 30 located on the right side of the column 4 are also fixedly arranged. A butt die 31 is fixedly arranged between the acting ends of the piston rods of the two vertical oil cylinders 30. A step groove 32 penetrating its top and bottom surfaces is opened in the butt die 31. On the bottom surface of the butt die 31, a second pressurizing oil cylinder 33 is fixedly arranged. The piston rod of the second pressurizing oil cylinder 33 extends into the small groove of the step groove 32, and a second pressurizing block 34 slidably matched with the step groove 32 is fixedly arranged on the extending end. On the top surface of the cushion block 19, two vertical oil cylinders 30 are fixedly arranged. An installation plate is fixedly arranged between the acting ends of the piston rods of the two vertical oil cylinders 30. The butt die 31 is welded to the middle of the installation plate and penetrates the top and bottom surfaces of the installation plate.

[0095] The outer contour of the first pressurizing block 29 is matched with the inner cavity 8 of the die 7, and the diameter of the first pressurizing block 29 is equal to the diameter of the second pressurizing block 34; the column 4 is matched with the inner cavity 8 of the die 7; the large groove of the step groove 32 is matched with the outer contour of the die 7.

[0096] This high-precision continuous pressing and forming device further includes a controller. The controller is electrically connected to the hydraulic motor 14, the lifting oil cylinder 22, the feeding oil cylinder 25, the horizontal oil cylinder 9, the first pressurizing oil cylinder 28, the vertical oil cylinder 30, and the second pressurizing oil cylinder 33 through signal lines. Workers can control the start or stop of the hydraulic motor 14 through the controller. At the same time, they can also control the extension or retraction of the piston rods of the lifting oil cylinder 22, the feeding oil cylinder 25, the horizontal oil cylinder 9, the first pressurizing oil cylinder 28, the vertical oil cylinder 30, and the second pressurizing oil cylinder 33, thus facilitating the operation of workers and having the characteristics of high automation.

[0097] A method for high-precision continuous pressing and forming of a powder metallurgy blank with an inner sunk groove includes the following steps:

[0098] S1. Fill the pressing assembly A17 with metal powder. The specific operation steps are as follows:

[0099] S11. The worker stands at the front side of the workbench 13 and drops a weighed portion of metal powder from top to bottom into the stepped groove 32 of the docking die 31 of the pressing assembly A17. The dropping direction is as shown by the arrow in Figure 20 . After the dropping is completed, this portion of metal powder is supported on the top surface of the second pressing block 34 and fills the small groove of the stepped groove 32;

[0100] S12. Control the piston rods of the two lifting cylinders 22 of the pressing assembly A17 to extend downward simultaneously. The piston rods drive the lifting seats 23 to move downward. The lifting seat 23 on the left drives the feeding cylinder 25 to move downward. At the same time, the lifting seat 23 on the right drives the guide rod 24 to move downward, thereby driving the frame 26 to move downward synchronously. The frame 26 drives the die 7, the first pressing cylinder 28, the two horizontal cylinders 9 and the two strip blocks 10 to move downward synchronously. When the piston rods of the lifting cylinders 22 extend to the set stroke, the controller controls the lifting cylinders 22 to close. At this time, the lower end of the inner cavity 8 of the die 7 just sleeves on the outside of the column 4, as shown in Figure 21 . And the top surface of the column 4 contacts the bottom surfaces of the inner ends of the two strip blocks 10;

[0101] S13. The worker drops another weighed portion of metal powder from top to bottom into the inner cavity 8 of the die 7 of the pressing assembly A17. The dropping direction is as shown by the arrow in Figure 22 . After the dropping is completed, this portion of metal powder is supported on the top surface of the column 4 and covers the inner ends of the two strip blocks 10, thus finally filling the metal powder into the pressing assembly A17;

[0102] S2. The worker controls the hydraulic motor 14 to start. The output shaft of the hydraulic motor 14 drives the rotating table 15 to rotate on the horizontal plane along the tabletop of the workbench 13. The rotating table 15 drives the pressing assembly A17 and the pressing assembly B16 to rotate synchronously. When the rotating table 15 rotates 180°, the controller controls the hydraulic motor 14 to close. At this time, the pressing assembly A17 moves to the left side of the workbench 13, as shown in Figures 23 - 24 . And the pressing assembly B16 moves to the right side of the workbench 13. The worker repeats the operation of step S1 once to fill the metal powder into the pressing assembly B16;

[0103] S3. Press and form the first powder metallurgy blank N through the pressing assembly A17. The specific operation steps are as follows:

[0104] S31. Control the piston rod of the first pressurizing oil cylinder 28 of the pressing assembly A17 to extend downward. The piston rod drives the first pressing block 29 to move downward. The first pressing block 29 extends into the inner cavity 8 of the mold 7 from top to bottom and gradually pressurizes the metal powder. Under the pressure, the metal powder becomes dense. When the piston rod of the first pressurizing oil cylinder 28 extends downward to the set stroke, the controller controls the first pressurizing oil cylinder 28 to close, thereby pressing the metal powder in the mold 7 into the upper semi-finished part 35 with two internal sinking grooves 2, as Figure 25 shown. The structure of the pressed upper semi-finished part 35 is as Figures 26 - 28 shown;

[0105] S32. Control the piston rods of the two lifting oil cylinders 22 of the pressing assembly A17 to retract upward simultaneously. The piston rods drive the lifting seat 23 to move upward, and then drive the frame 26 to move upward synchronously. The frame 26 drives the mold 7, the first pressurizing oil cylinder 28, the two horizontal oil cylinders 9 and the two strip blocks 10 to move upward synchronously. The mold 7 gradually disengages from the column 4. At the same time, the mold 7 also drives the upper semi-finished part 35 to move upward synchronously. When the piston rods of the lifting oil cylinders 22 are fully retracted, the mold 7 just moves directly above the column 4, as Figure 29 shown;

[0106] S33. Control the piston rod of the feed oil cylinder 25 of the pressing assembly A17 to extend leftward. The piston rod drives the frame 26 to move leftward. The frame 26 drives the mold 7, the first pressurizing oil cylinder 28, the two horizontal oil cylinders 9 and the two strip blocks 10 to move leftward synchronously. The mold 7 drives the upper semi-finished part 35 to move leftward synchronously. When the piston rod of the feed oil cylinder 25 is fully extended, the mold 7 just moves directly above the step groove 32 of the docking mold 31, as Figure 30 shown;

[0107] S34. Control the piston rods of the two vertical oil cylinders 30 of the pressing assembly A17 to extend upward. The piston rods drive the mounting plate to move upward. The mounting plate drives the docking mold 31 to move upward. The docking mold 31 drives the second pressurizing oil cylinder 33, the second pressing block 34 and the metal powder therein to move upward synchronously. When the piston rods of the vertical oil cylinders 30 are fully extended, the large groove of the docking mold 31 just sleeves on the lower end of the mold 7, as Figure 31 shown, and the step groove 32 of the docking mold 31 is communicated with the inner cavity 8 of the mold 7;

[0108] S35. Control the piston rod of the second pressurizing oil cylinder 33 of the pressing assembly A17 to extend upward. The piston rod drives the second pressing block 34 to move upward. The second pressing block 34 pushes the metal powder in the docking die 31 upward into the inner cavity of the die 7. Under the gradual pressurization of the second pressing block 34, the metal powder is gradually pressed onto the upper semi-workpiece 35. When the piston rod of the second pressurizing oil cylinder 33 extends to the set stroke, the controller controls the second pressurizing oil cylinder 33 to close, thereby pressing the metal powder in the docking die 31 into the lower semi-workpiece 36 connected to the upper semi-workpiece 35 as shown in Figure 32 . The lower semi-workpiece 36 and the upper semi-workpiece 35 together form the powder metallurgy workpiece N37. Thus, finally, the first powder metallurgy workpiece N37 with two inner sunk grooves 2 is formed by pressing through the pressing assembly A17. The structure of the pressed powder metallurgy workpiece N37 is as shown in Figures 33 - 34 ;

[0109] Among them, in step S31, when the first pressing block 29 presses the metal powder in the die 7 into the upper semi-workpiece 35, since the top surface of the column 4 is always in contact with the bottom surfaces of the inner ends of the two strip-shaped blocks 10, the column 4 supports the inner ends of the two strip-shaped blocks 10, overcoming the pressure from the first pressing block 29, thus effectively preventing the force exerted by the first pressing block 29 from bending the two strip-shaped blocks 10 downward. In step S35, when the second pressing block 34 presses the metal powder in the docking die 31 into the lower semi-workpiece 36, since the upper semi-workpiece 35 and the first pressing block 29 both block the inner ends of the two strip-shaped blocks 10, overcoming the pressure from the second pressing block 34, thus effectively preventing the force exerted by the second pressing block 34 from bending the inner ends of the two strip-shaped blocks 10 upward, and further ensuring that the two inner sunk grooves 2 in the powder metallurgy workpiece N37 composed of the upper semi-workpiece 35 and the lower semi-workpiece 36 are both in a horizontal state.

[0110] It can be seen from this that the powder metallurgy workpiece N37 pressed by this high-precision continuous pressing device, compared with the powder metallurgy workpiece M1 pressed as shown in Figures 3 - 8 , the two inner sunk grooves 2 in the pressed powder metallurgy workpiece N37 are both in a horizontal state without any inclination, thus greatly improving the pressing and forming quality of the powder metallurgy workpiece, having the technical advantage of higher pressing precision, and thus ensuring that the pressed powder metallurgy workpiece can meet the requirements of high-end customers.

[0111] S4. Taking away the first powder metallurgy workpiece N37, the specific operation steps are as follows:

[0112] S41. Control the pistons of the two horizontal oil cylinders 9 of the pressing assembly A17 to retract. The pistons drive the strip-shaped blocks 10 to move outward, and the strip-shaped blocks 10 gradually withdraw from the powder metallurgy blank N37. After the pistons of the horizontal oil cylinders 9 are fully retracted, the strip-shaped blocks 10 can be completely withdrawn from the powder metallurgy blank N37, as Figure 35 shown;

[0113] S42. Control the piston of the first pressing oil cylinder 28 of the pressing assembly A17 to retract upward. The piston drives the first pressing block 29 to move upward. The first pressing block 29 first separates from the powder metallurgy blank N37 and then withdraws from the inner cavity 8 of the mold 7, as Figure 36 shown;

[0114] S43. Control the piston of the second pressing oil cylinder 33 of the pressing assembly A17 to extend upward. The piston drives the second pressing block 34 to move upward. The second pressing block 34 pushes the powder metallurgy blank N37 to move upward. After the piston of the second pressing oil cylinder 33 is fully extended, the powder metallurgy blank N37 is just pushed out of the mold 7 by the second pressing block 34, as Figure 37 shown. At this time, the worker takes away the powder metallurgy blank N37, and the taking-away direction is as Figure 37 indicated by the arrow in;

[0115] S5. The worker controls the hydraulic motor 14 to start. The output shaft of the hydraulic motor 14 drives the rotating table 15 to rotate on the horizontal plane along the tabletop of the workbench 13. The rotating table 15 drives the pressing assembly A17 and the pressing assembly B16 to rotate synchronously. After the rotating table 15 rotates 180°, the controller controls the hydraulic motor 14 to shut down. At this time, the pressing assembly A17 moves to the right side of the workbench 13, while the pressing assembly B16 moves to the left side of the workbench 13. Then the worker fills new metal powder into the pressing assembly A17 again, and then the worker repeats the operations of steps S3 - S4 once, so as to press out the second powder metallurgy blank N37 through the pressing assembly B16;

[0116] S6. The worker repeats the operation of step S5 many times, and can continuously and uninterruptedly press and form the required number of powder metallurgy blanks N37 through the alternately working pressing assembly A17 and pressing assembly B16.

[0117] Among them, it can be seen from steps S1 - S6 that this high-precision continuous pressing and forming device can continuously and continuously press and form the powder metallurgy blank N37 through the linkage cooperation of the hydraulic motor 14, the pressing assembly A17 and the pressing assembly B16. Thus, it can be known that this high-precision continuous pressing and forming device compared with Figures 3 - 8The pressing method shown realizes the continuous pressing and forming of the required number of PM blanks N37 by the customer within a short time, without the need for workers to press PM blanks one by one, thus greatly improving the pressing and forming efficiency of PM blanks.

[0118] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-precision continuous pressing and forming device for a powder metallurgy blank with an inner sunk groove, characterized in that: It includes a hydraulic motor (14) fixedly arranged on the bottom surface of the workbench (13). The output shaft of the hydraulic motor (14) penetrates the workbench (13) upward, and a rotating table (15) supported on the tabletop of the workbench (13) is fixedly arranged at the extending end. Pressing assemblies B (16) and A (17) for pressing metal powder are respectively arranged at the left and right ends of the rotating table (15). The pressing assembly A (17) located at the right end of the rotating table (15) includes an L-shaped support (18) and a cushion block (19) fixedly arranged on the rotating table (15). Vertical through grooves (20) and horizontal through grooves (21) are respectively formed in the vertical seat and the horizontal seat of the L-shaped support (18). Two lifting oil cylinders (22) respectively located on the left and right sides of the horizontal through groove (21) are fixedly arranged on the top surface of the L-shaped support (18). The piston rods of the two lifting oil cylinders (22) penetrate the horizontal seat downward, and lifting seats (23) are fixedly connected to the extending ends. A guide rod (24) slidably penetrates through the lifting seat (23) located on the right side. A feeding oil cylinder (25) penetrating the vertical through groove (20) to the left is fixedly arranged on the left end surface of the lifting seat (23) located on the left side. A frame (26) is welded between the acting end of the piston rod of the feeding oil cylinder (25) and the left end of the guide rod (24). A mold (7) penetrating the top and bottom surfaces of the frame (26) is welded in the middle of the frame (26). Two horizontal oil cylinders (9) respectively located on the left and right sides of the mold (7) are fixedly arranged in the frame (26). Strip-shaped blocks (10) are fixedly arranged on the acting ends of the piston rods of the two horizontal oil cylinders (9). The inner ends of the two strip-shaped blocks (10) extend into the inner cavity (8) of the mold (7). A support (27) penetrating the horizontal through groove (21) upward is fixedly arranged on the top surface of the frame (26). A first pressurizing oil cylinder (28) is fixedly arranged on the top wall of the support (27). A first pressurizing block (29) located directly above the mold (7) is fixedly arranged on the acting end of the piston rod of the first pressurizing oil cylinder (28). A column (4) located directly below the mold (7) is fixedly arranged on the top surface of the cushion block (19). Two vertical oil cylinders (30) located on the right side of the column (4) are also fixedly arranged on the top surface of the cushion block (19). A docking mold (31) is fixedly arranged between the acting ends of the piston rods of the two vertical oil cylinders (30). A stepped groove (32) penetrating the top and bottom surfaces of the docking mold (31) is formed in the docking mold (31). A second pressurizing oil cylinder (33) is fixedly arranged on the bottom surface of the docking mold (31). The piston rod of the second pressurizing oil cylinder (33) extends into the small groove of the stepped groove (32), and a second pressurizing block (34) slidably matched with the stepped groove (32) is fixedly arranged at the extending end. The outer contour of the first pressurizing block (29) is matched with the inner cavity (8) of the mold (7), and the diameter of the first pressurizing block (29) is equal to the diameter of the second pressurizing block (34). The column (4) is matched with the inner cavity (8) of the mold (7). The large groove of the stepped groove (32) is matched with the outer contour of the mold (7).

2. The high-precision continuous pressing and forming device for a powder metallurgy blank with an internal sinking groove according to claim 1, characterized in that: A plurality of legs supporting on the ground are fixedly arranged on the bottom surface of the workbench (13).

3. The high-precision continuous pressing and forming device for a powder metallurgy blank with an internal sinking groove according to claim 2, characterized in that: The pressing assembly A (17) and the pressing assembly B (16) are symmetrically arranged left and right with respect to the hydraulic motor (14).

4. The high-precision continuous pressing and forming device for a powder metallurgy blank with an internal sinking groove according to claim 3, characterized in that: A guide hole is formed in the lifting seat (23) on the right side, and the guide rod (24) is slidably engaged with the guide hole.

5. The high-precision continuous pressing and forming device for a powder metallurgy blank with an internal sinking groove according to claim 4, characterized in that: The two horizontal oil cylinders (9) are symmetrically arranged left and right with respect to the mold (7), the two strip-shaped blocks (10) are symmetrically arranged left and right with respect to the mold (7), and the cross-section of the strip-shaped block (10) is rectangular.

6. The high-precision continuous pressing and forming device for a powder metallurgy blank with an internal sinking groove according to claim 5, characterized in that: Two vertical oil cylinders (30) are fixedly arranged on the top surface of the cushion block (19), an installation plate is fixedly arranged between the acting ends of the piston rods of the two vertical oil cylinders (30), the docking die (31) is welded to the middle of the installation plate, and the docking die (31) penetrates through the top and bottom surfaces of the installation plate.

7. The high-precision continuous pressing and forming device for a powder metallurgy blank with an internal sinking groove according to claim 6, characterized in that: The high-precision continuous pressing and forming device further includes a controller, which is electrically connected to the hydraulic motor (14), the lifting oil cylinder (22), the feeding oil cylinder (25), the horizontal oil cylinder (9), the first pressing oil cylinder (28), the vertical oil cylinder (30) and the second pressing oil cylinder (33) via signal lines.

8. A method for high-precision continuous pressing and forming of a powder metallurgy blank with an internal sink, using the high-precision continuous pressing and forming device for a powder metallurgy blank with an internal sink described in claim 7, characterized in that: It includes the following steps: S1. Fill the pressing assembly A (17) with metal powder. The specific operation steps are as follows: S11. The worker stands on the front side of the workbench (13) and drops a weighed part of the metal powder from top to bottom into the step groove (32) of the docking die (31) of the pressing assembly A (17). After the dropping is completed, this part of the metal powder supports on the top surface of the second pressing block (34) and fills the small groove of the step groove (32). S12. Control the piston rods of the two lifting oil cylinders (22) of the pressing assembly A (17) to extend downward simultaneously. The piston rods drive the lifting seat (23) to move downward. The lifting seat (23) on the left drives the feeding oil cylinder (25) to move downward. At the same time, the lifting seat (23) on the right drives the guide rod (24) to move downward, thereby driving the frame (26) to move downward synchronously. The frame (26) drives the mold (7), the first pressing oil cylinder (28), the two horizontal oil cylinders (9) and the two strip-shaped blocks (10) to move downward synchronously. When the piston rods of the lifting oil cylinders (22) extend to the set stroke, the controller controls the lifting oil cylinders (22) to close. At this time, the lower end of the inner cavity (8) of the mold (7) just sleeves outside the column (4), and the top surface of the column (4) contacts the bottom surfaces of the inner ends of the two strip-shaped blocks (10). S13. The worker drops another weighed part of the metal powder from top to bottom into the inner cavity (8) of the mold (7) of the pressing assembly A (17). After the dropping is completed, this part of the metal powder supports on the top surface of the column (4) and covers the inner ends of the two strip-shaped blocks (10), thereby finally filling the pressing assembly A (17) with metal powder. S2. The worker controls the hydraulic motor (14) to start. The output shaft of the hydraulic motor (14) drives the rotating table (15) to rotate on the horizontal plane along the tabletop of the workbench (13). The rotating table (15) drives the pressing assembly A (17) and the pressing assembly B (16) to rotate synchronously. After the rotating table (15) rotates 180°, the controller controls the hydraulic motor (14) to shut down. At this time, the pressing assembly A (17) moves to the left side of the workbench (13), and the pressing assembly B (16) moves to the right side of the workbench (13). The worker repeats the operation in step S1 once to fill the metal powder into the pressing assembly B (16). S3. The first powder metallurgy blank N is pressed and formed by the pressing assembly A (17). The specific operation steps are as follows: S31. Control the piston rod of the first pressurizing oil cylinder (28) of the pressing assembly A (17) to extend downward. The piston rod drives the first pressing block (29) to move downward. The first pressing block (29) extends into the inner cavity (8) of the mold (7) from top to bottom and gradually pressurizes the metal powder. Under the pressure, the metal powder becomes dense. When the piston rod of the first pressurizing oil cylinder (28) extends downward to the set stroke, the controller controls the first pressurizing oil cylinder (28) to shut down, thereby pressing the metal powder in the mold (7) into the upper half blank (35) with two inner sinking grooves (2). S32. Control the piston rods of the two lifting oil cylinders (22) of the pressing assembly A (17) to retract upward simultaneously. The piston rods drive the lifting seat (23) to move upward, and then drive the frame (26) to move upward synchronously. The frame (26) drives the mold (7), the first pressurizing oil cylinder (28), the two horizontal oil cylinders (9) and the two strip blocks (10) to move upward synchronously. The mold (7) gradually disengages from the column (4). At the same time, the mold (7) also drives the upper half blank (35) to move upward synchronously. When the piston rods of the lifting oil cylinders (22) are fully retracted, the mold (7) just moves to directly above the column (4). S33. Control the piston rod of the feeding oil cylinder (25) of the pressing assembly A (17) to extend leftward. The piston rod drives the frame (26) to move leftward. The frame (26) drives the mold (7), the first pressurizing oil cylinder (28), the two horizontal oil cylinders (9) and the two strip blocks (10) to move leftward synchronously. The mold (7) drives the upper half blank (35) to move leftward synchronously. When the piston rod of the feeding oil cylinder (25) is fully extended, the mold (7) just moves to directly above the step groove (32) of the docking mold (31). S34. Control the piston rods of the two vertical oil cylinders (30) of the pressing assembly A (17) to extend upward. The piston rods drive the mounting plate to move upward. The mounting plate drives the docking mold (31) to move upward. The docking mold (31) drives the second pressurizing oil cylinder (33), the second pressing block (34) and the metal powder therein to move upward synchronously. When the piston rods of the vertical oil cylinders (30) are fully extended, the large groove of the docking mold (31) just sleeves on the lower end of the mold (7), and the step groove (32) of the docking mold (31) communicates with the inner cavity (8) of the mold (7). S35. Control the piston rod of the second pressurizing oil cylinder (33) of the pressing assembly A (17) to extend upward. The piston rod drives the second pressing block (34) to move upward. The second pressing block (34) pushes the metal powder in the docking die (31) upward into the inner cavity of the die (7). Under the gradual pressurization of the second pressing block (34), the metal powder is gradually pressed onto the upper semi-workpiece (35). When the piston rod of the second pressurizing oil cylinder (33) extends to the set stroke, the controller controls the second pressurizing oil cylinder (33) to close, thereby pressing the metal powder in the docking die (31) into the lower semi-workpiece (36) connected to the upper semi-workpiece (35). The lower semi-workpiece (36) and the upper semi-workpiece (35) together form the powder metallurgy workpiece N (37), and finally, the first powder metallurgy workpiece N (37) with two inner sinking grooves (2) is formed by pressing through the pressing assembly A (17). S4. Removal of the first powder metallurgy workpiece N (37). The specific operation steps are as follows: S41. Control the piston rods of the two horizontal oil cylinders (9) of the pressing assembly A (17) to retract. The piston rods drive the strip-shaped block (10) to move outward. The strip-shaped block (10) gradually withdraws from the powder metallurgy workpiece N (37). When the piston rods of the horizontal oil cylinders (9) are fully retracted, the strip-shaped block (10) can be completely withdrawn from the powder metallurgy workpiece N (37). S42. Control the piston rod of the first pressurizing oil cylinder (28) of the pressing assembly A (17) to retract upward. The piston rod drives the first pressing block (29) to move upward. The first pressing block (29) first separates from the powder metallurgy workpiece N (37), and then withdraws from the inner cavity (8) of the die (7). S43. Control the piston rod of the second pressurizing oil cylinder (33) of the pressing assembly A (17) to extend upward. The piston rod drives the second pressing block (34) to move upward. The second pressing block (34) pushes the powder metallurgy workpiece N (37) upward. When the piston rod of the second pressurizing oil cylinder (33) is fully extended, the powder metallurgy workpiece N (37) is just pushed out of the die (7) by the second pressing block (34). At this time, the worker takes away the powder metallurgy workpiece N (37). S5. The worker controls the hydraulic motor (14) to start. The output shaft of the hydraulic motor (14) drives the rotating table (15) to rotate on the horizontal plane along the tabletop of the workbench (13). The rotating table (15) drives the pressing assembly A (17) and the pressing assembly B (16) to rotate synchronously. When the rotating table (15) rotates 180°, the controller controls the hydraulic motor (14) to close. At this time, the pressing assembly A (17) moves to the right side of the workbench (13), and the pressing assembly B (16) moves to the left side of the workbench (13). Then the worker fills new metal powder into the pressing assembly A (17) again, and then the worker repeats the operations of steps S3 - S4 once, thereby pressing out the second powder metallurgy workpiece N (37) through the pressing assembly B (16). S6. The worker repeats the operation in step S5 multiple times, and then the required number of powder metallurgy blanks N (37) can be continuously and uninterruptedly press-molded by the alternately working pressing assembly A (17) and pressing assembly B (16).

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