High-precision continuous pressing forming device and method for powder metallurgy blank with inner sinking groove

Abstract

The invention discloses a high-precision continuous pressing forming device and method for a powder metallurgy blank with an inner sinking groove, and relates to the technical field of pressing forming of the powder metallurgy blank with the inner sinking groove. The high-precision continuous pressing forming device comprises a hydraulic motor fixedly arranged on the bottom surface of a workbench, and an output shaft of the hydraulic motor upwards penetrates through the workbench; and a rotating table supported on the table top of the workbench is fixedly arranged at the extending end, and a pressing assembly B and a pressing assembly A which are used for pressing metal powder are arranged at the left end and the right end of the rotating table correspondingly. The powder metallurgy blank pressing device has the beneficial effects that the powder metallurgy blank pressing quality is greatly improved, and the powder metallurgy blank pressing forming efficiency is greatly improved.

Description

Technical Field

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

[0002] The structure of a powder metallurgy billet M with internal sunk grooves is as Figures 1 - 2 shown. The powder metallurgy billet M1 is generally circular in shape. Transverse cross-sectionally rectangular internal sunk grooves 2 are formed on the left and right cylindrical surfaces of the powder metallurgy billet M1. The two internal sunk grooves 2 are symmetric with each other left and right, and both of the two internal sunk grooves 2 are in a horizontal state. The two internal 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 cylinders 5. The two jacking 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 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; Two horizontal cylinders 9 are fixed on the top surface of the jacking plate 6 and are respectively located on the left and right sides of the mold 7. Bar-shaped blocks 10 are fixed on the acting ends of the piston rods of the two horizontal cylinders 9. The inner ends of the bar-shaped blocks 10 extend into the inner cavity 8 of the mold 7, and the two bar-shaped blocks 10 are opposite to each other left and right; A pressing cylinder 11 is fixed on the top surface of the cross beam of the gantry 3. The piston rod of the pressing cylinder 11 penetrates downward through the cross beam, and a pressing head 12 is connected to the extending end. The pressing head 12 is located directly above the inner cavity 8 of the mold 7.

[0005] The method for workers in the workshop to press out the powder metallurgy billets M1 by using this pressing and forming device is as follows: 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 the figure. At this time, the metal powder supports on the top surface of the column 4 and covers the inner ends of the two bar-shaped blocks 10, so as to fill the inner cavity 8 of the mold 7 with metal powder; Sb. The piston rod of the worker-controlled pressure cylinder 11 extends downward. The piston rod drives the pressure head 12 to move downward. The pressure head 12 extends into the inner cavity 8 of the mold 7 from top to bottom and gradually presses the metal powder. Under the pressure, the metal powder becomes dense. When the piston rod of the pressure 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; Sc. Taking away the first powder metallurgy blank M1, the specific operation steps are as follows: Sc1. Control the piston rods of the two horizontal cylinders 9 to retract. The piston rods drive the strip blocks 10 to move outward. The strip blocks 10 gradually withdraw from the powder metallurgy blank M1. When the piston rods of the horizontal cylinders 9 are fully retracted, the strip blocks 10 can be completely withdrawn from the powder metallurgy blank M1, as Figure 7 shown; Sc2. Control the piston rod of the pressure cylinder 11 to retract upward. The piston rod drives the pressure head 12 to retract upward to reset the pressure head 12. Then control the piston rods of the two lifting cylinders 5 to retract downward. The piston rods drive the lifting plate 6 to move downward. The lifting plate 6 drives the horizontal cylinders 9 and the mold 7 to move downward relative to the stationary powder metallurgy blank M1. When the piston rods of the lifting 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 indicated by the arrow in; Sd. The worker repeats the operations of steps Sa~Sc many times to continuously press and form multiple powder metallurgy blanks M1.

[0006] However, although this pressing and forming equipment can press the required powder metallurgy blank M1, in the actual application process, the following technical defects are often reflected: I. In step Sb, since the inner ends of the two strip blocks 10 are both in a suspended state, when the pressure head 12 presses the metal powder, the pressure of the pressure head 12 will be transmitted to the inner ends of the two strip blocks 10, causing the inner ends of the two strip blocks 10 to bend downward. The deformation direction of the inner ends of the strip blocks 10 is as Figure 6 indicated by the arrow in, resulting in the two inner sinking grooves 2 of the pressed powder metallurgy blank M1 being in an inclined state (while the process requires that the two inner sinking grooves 2 of the pressed powder metallurgy blank M1 be in a horizontal state). This undoubtedly reduces the pressing and forming quality of the powder metallurgy blank M1 and has the technical defect of low pressing accuracy. The pressed powder metallurgy blank M1 cannot meet the requirements of high-end customers.

[0007] 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. That is to say, this kind of pressing and forming equipment can only press powder metallurgy blanks M1 one by one, and cannot continuously press powder metallurgy blanks M1. However, the customer needs 200 - 211 powder metallurgy blanks M1 per day. This undoubtedly results in a long time being consumed to press the required number of powder metallurgy blanks M1, thereby reducing the pressing and forming efficiency of the powder metallurgy blank M1.

[0008] 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

[0009] 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 sunk grooves, which can greatly improve the pressing quality of powder metallurgy blanks and greatly improve the pressing and forming efficiency of powder metallurgy blanks.

[0010] The purpose of the present invention is achieved through the following technical solutions: A high-precision continuous pressing and forming device for powder metallurgy blanks with inner sunk 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; 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. Vertical through grooves and horizontal through grooves are respectively opened in the vertical seat and horizontal seat of the L-shaped support. Two lifting oil 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 oil cylinders all 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. A feeding oil 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 oil cylinder and the left end of the guide rod; A mold penetrating the top and bottom surfaces of the frame is welded in the middle of the frame. Two horizontal oil cylinders are fixed in the frame, respectively located on the left and right sides of the mold. Strip-shaped blocks are fixedly provided on the acting ends of the piston rods of the two horizontal oil cylinders. The inner ends of the two strip-shaped blocks all extend into the inner cavity of the mold; A support penetrating the horizontal through groove upward is fixed on the top surface of the frame. A first pressurizing oil cylinder is fixed on the top wall of the support. A first pressurizing block located directly above the mold is fixed on the acting end of the piston rod of the first pressurizing oil cylinder; On the top surface of the cushion block, there is a column fixed directly below the mold. On the top surface of the cushion block, there are also two vertical oil cylinders fixed on the right side of the column. Between the acting ends of the piston rods of the two vertical oil cylinders, there is a docking die fixed. A stepped groove penetrating through its top and bottom surfaces is opened in the docking die. On the bottom surface of the docking die, there is a second pressing oil cylinder fixed. The piston rod of the second pressing oil cylinder extends into the small groove of the stepped groove, and a second pressing block slidably matched with the stepped groove is fixed on the extending end.

[0011] On the bottom surface of the workbench, there are multiple legs fixed to support it on the ground.

[0012] The pressing assembly A and the pressing assembly B are symmetrically arranged left and right with respect to the hydraulic motor.

[0013] A guiding hole is opened in the lifting seat on the right side, and the guiding rod is slidably matched with the guiding hole.

[0014] The two horizontal oil cylinders are symmetrically arranged left and right with respect to the mold. The two strip-shaped blocks are symmetrically arranged left and right with respect to the mold. The cross-section of the strip-shaped block is rectangular.

[0015] The outer contour of the first pressing block is matched with the inner cavity of the mold. The diameter of the first pressing block is equal to the diameter of the second pressing 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.

[0016] On the top surface of the cushion block, there are two vertical oil cylinders fixed. Between the acting ends of the piston rods of the two vertical oil cylinders, there is a mounting plate fixed. The docking die is welded to the middle of the mounting plate and penetrates through the top and bottom surfaces of the mounting plate.

[0017] 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 pressing oil cylinder, the vertical oil cylinder, and the second pressing oil cylinder via signal lines.

[0018] A method for high-precision continuous pressing and forming of a powder metallurgy blank with an internal sunk groove includes the following steps: S1. Fill the pressing assembly A with metal powder. The specific operation steps are as follows: S11. The worker stands on the front side of the workbench and drops a weighed portion of the 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 the metal powder supports on the top surface of the second pressing block and fills the small groove of the stepped groove. 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 mold, 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 mold just sleeved outside the column, and the top surface of the column contacts the bottom surfaces of the inner sides of the two strip blocks; S13. The worker feeds the weighed another part of metal powder into the inner cavity of the mold of the pressing assembly A from top to bottom. After the feeding is completed, this part of the metal powder supports on the top surface of the column and covers the inner sides of the two strip blocks, thus finally filling the metal powder into the pressing assembly A; 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 along 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; S3. Press and form the first powder metallurgy blank N through the pressing assembly A. The specific operation steps are as follows: 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 mold from top to bottom and gradually presses the metal powder. Under the pressing, 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 mold into an upper semi-blank with two inner sinking grooves; 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, thereby driving 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 detaches 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; 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; S34. Control the piston rods of the two vertical oil 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 die to move upward, and the docking die drives the second pressing oil cylinder, the second pressing block and the metal powder inside it to move upward synchronously. When the piston rods of the vertical oil cylinders are fully extended, the large groove of the docking die just sleeves on the lower end of the mold, and the stepped groove of the docking die communicates with the inner cavity of the mold; S35. Control the piston rod of the second pressing 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 metal powder in the docking die 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-workpiece; when the piston rod of the second pressing oil cylinder extends to the set stroke, the controller controls the second pressing oil cylinder to close, so as to press the metal powder in the docking die into the lower semi-workpiece connected to the upper semi-workpiece. The lower semi-workpiece and the upper semi-workpiece together form the powder metallurgy workpiece N, and finally the first powder metallurgy workpiece N with two internal sinking grooves is formed by pressing through the pressing assembly A; S4. Taking away the first powder metallurgy workpiece N, the specific operation steps are as follows: S41. Control the piston rods of the two horizontal oil cylinders of the pressing assembly A to retract. The piston rods drive the strip block to move outward, and the strip block gradually withdraws from the powder metallurgy workpiece N. When the piston rods of the horizontal oil cylinders are fully retracted, the strip block can be completely withdrawn from the powder metallurgy workpiece N; S42. Control the piston rod of the first pressing oil 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 workpiece N and then withdraws from the inner cavity of the mold; S43. Control the piston rod of the second pressing 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 workpiece N upward. When the piston rod of the second pressing oil cylinder is fully extended, the powder metallurgy workpiece N is just pushed out of the mold by the second pressing block. At this time, the worker takes away the powder metallurgy workpiece N; 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 close. 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 workpiece N through the pressing assembly B; S6. The worker repeats the operation in step S5 multiple times, and thus the required number of powder metallurgy blanks N can be continuously and uninterruptedly press-formed by the alternately working pressing assembly A and pressing assembly B.

[0019] The present invention has the following advantages: greatly improving the pressing quality of powder metallurgy blanks and greatly improving the press-forming efficiency of powder metallurgy blanks. Description of the Drawings

[0020] Figure 1 Isometric view of the powder metallurgy blank M; Figure 2 Is Figure 1 Main sectional schematic diagram of; Figure 3 Is the structural schematic diagram of the press-forming equipment used in a certain workshop; Figure 4 Is the schematic diagram of filling the inner cavity of the mold of the press-forming equipment with metal powder; Figure 5 Is the schematic diagram of the press-forming equipment press-forming the first powder metallurgy blank M; Figure 6 Is Figure 5 Partial enlarged view of part I of; Figure 7 Is the schematic diagram of the two strip blocks of the press-forming equipment completely withdrawing from the powder metallurgy blank M; Figure 8 Is the schematic diagram of the powder metallurgy blank M exposed outside the mold; Figure 9 Is the structural schematic diagram of the present invention; Figure 10 Is Figure 9 Main sectional schematic diagram of; Figure 11 Is the structural schematic diagram of the pressing assembly A; Figure 12 Is Figure 11 Main sectional schematic diagram of; Figure 13 Is the structural schematic diagram of the L-shaped support; Figure 14 Is Figure 13 Main sectional schematic diagram of; Figure 15 Is Figure 12 Connection schematic diagram of the feed oil cylinder, frame, mold and first pressurizing oil cylinder in; Figure 16 Is Figure 12 Connection schematic diagram of the horizontal oil cylinder and the strip block in; Figure 17 Connection schematic diagram of the vertical oil cylinder, mounting plate, docking mold and second pressurizing oil cylinder; Figure 18 is Figure 17 a schematic structural diagram of the docking die in Figure 19 is Figure 18 the main sectional view of Figure 20 a schematic diagram of adding a portion of weighed metal powder into the stepped groove of the docking die of the pressing assembly A; Figure 21 a schematic diagram of the lower end of the inner cavity of the die sleeved outside the column; Figure 22 a schematic diagram of adding another portion of weighed metal powder into the inner cavity of the die of the pressing assembly A; Figure 23 a schematic diagram of the pressing assembly A moving to the left side of the workbench; Figure 24 is Figure 23 the partial enlarged view of part II of Figure 25 a schematic diagram of the first pressing block pressing the metal powder in the die into the upper semi-workpiece; Figure 26 the axonometric view of the upper semi-workpiece; Figure 27 is Figure 25 the main sectional view of Figure 28 is Figure 25 the bottom view of Figure 29 a schematic diagram of the die moving directly above the column; Figure 30 a schematic diagram of the die moving directly above the stepped groove of the docking die; Figure 31 a schematic diagram of the large groove of the docking die sleeved outside the lower end of the die; Figure 32 a schematic diagram of the second pressing block pressing the metal powder in the docking die into the lower semi-workpiece connected to the upper semi-workpiece as a whole; Figure 33 the axonometric view of the powder metallurgy workpiece N formed by pressing; Figure 34 is Figure 33 the main sectional view of Figure 35 a schematic diagram of the strip block completely withdrawn from the powder metallurgy workpiece N; Figure 36 a schematic diagram of the first pressing block withdrawn from the inner cavity of the die; Figure 37 a schematic diagram of the powder metallurgy workpiece N ejected to the outside of the die by the second pressing block; In the figure: 1 - Powder metallurgy blank M, 2 - Inner sunken 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; 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; 30 - Vertical oil cylinder, 31 - Docking mold, 32 - Step groove, 33 - Second pressing oil cylinder, 34 - Second pressing block; 35 - Upper semi-blank, 36 - Lower semi-blank, 37 - Powder metallurgy blank N. Detailed implementation mode

[0021] 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: As Figures 9 - 19 shown, a high-precision continuous pressing and forming device for a powder metallurgy blank with an inner sunken groove includes a hydraulic motor 14 fixedly arranged on the bottom surface of the workbench 13. The output shaft of the hydraulic motor 14 penetrates upward through the workbench 13, and a rotary table 15 supported on the table surface of the workbench 13 is fixedly arranged on the extending end. Pressing assemblies B16 and A17 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 A17 and B16 are symmetrically arranged about the hydraulic motor 14 left and right.

[0022] The pressing assembly A17 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. Vertical through grooves 20 and horizontal through grooves 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 and are respectively located on the left and right sides of the horizontal through groove 21. The piston rods of the two lifting oil cylinders 22 penetrate downward through the horizontal seat, 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 leftward through the vertical through groove 20 is fixedly arranged on the left end surface of the left lifting seat 23. 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.

[0023] 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 in the frame 26, respectively located on the left and right sides of the die 7. On the acting ends of the piston rods of the two horizontal oil cylinders 9, strip-shaped blocks 10 are fixedly arranged. The inner ends of the two strip-shaped blocks 10 extend into the inner cavity 8 of the die 7; on the top surface of the frame 26, a bracket 27 penetrating the horizontal through groove 21 upward is fixedly arranged. On the top wall of the bracket 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 strip-shaped blocks 10 are symmetric about the left and right of the die 7, and the cross-section of the strip-shaped block 10 is rectangular.

[0024] 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. Between the acting ends of the piston rods of the two vertical oil cylinders 30, a butt die 31 is fixedly arranged. A stepped groove 32 penetrating its top and bottom surfaces is formed 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 stepped groove 32, and a second pressurizing block 34 slidably matched with the stepped 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. Between the acting ends of the piston rods of the two vertical oil cylinders 30, a mounting plate is fixedly arranged. The butt die 31 is welded to the middle of the mounting plate, and the butt die 31 penetrates the top and bottom surfaces of the mounting plate.

[0025] 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 stepped groove 32 is matched with the outer contour of the die 7.

[0026] This 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 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.

[0027] A method for high-precision continuous pressing and forming of a powder metallurgy blank with an internal sunk groove includes the following steps: S1. Fill the pressing assembly A17 with metal powder, and its specific operation steps are as follows: 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 step 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 step groove 32. 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 outside 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. 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. 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 close to 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 , while 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. S3. Press and form the first powder metallurgy blank N through the pressing assembly A17. The specific operation steps are as follows: S31. Control the piston rod of the first pressing 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 die 7 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 28 extends to the set stroke, the controller controls the first pressing cylinder 28 to close, thereby pressing the metal powder in the die 7 into the upper half blank 35 with two inner sinking grooves 2, as shown in Figure 25As shown, the structure of the upper semi-blank 35 pressed out is as Figures 26 - 28 shown; S32. Control the piston rods of the two lifting 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 die 7, the first pressing cylinder 28, the two horizontal cylinders 9, and the two strip blocks 10 to move upward synchronously. The die 7 gradually disengages from the column 4. At the same time, the die 7 also drives the upper semi-blank 35 to move upward synchronously. When the piston rods of the lifting cylinders 22 are fully retracted, the die 7 just moves directly above the column 4, as Figure 29 shown; S33. Control the piston rod of the feed 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 die 7, the first pressing cylinder 28, the two horizontal cylinders 9, and the two strip blocks 10 to move leftward synchronously. The die 7 drives the upper semi-blank 35 to move leftward synchronously. When the piston rod of the feed cylinder 25 is fully extended, the die 7 just moves directly above the step groove 32 of the docking die 31, as Figure 30 shown; S34. Control the piston rods of the two vertical 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 die 31 to move upward. The docking die 31 drives the second pressing cylinder 33, the second pressing block 34, and the metal powder therein to move upward synchronously. When the piston rods of the vertical cylinders 30 are fully extended, the large groove of the docking die 31 just sleeves on the lower end of the die 7, as Figure 31 shown, and the step groove 32 of the docking die 31 communicates with the inner cavity 8 of the die 7; S35. Control the piston rod of the second pressing 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 pressing of the second pressing block 34, the metal powder is gradually pressed onto the upper semi-blank 35; when the piston rod of the second pressing cylinder 33 extends to the set stroke, the controller controls the second pressing cylinder 33 to close, so as to press the metal powder in the docking die 31 into the lower semi-blank 36 connected to the upper semi-blank 35 integrally, as Figure 32 shown. The lower semi-blank 36 and the upper semi-blank 35 together form the powder metallurgy blank N37. Thus, finally, the first powder metallurgy blank N37 with two inner sinking grooves 2 is pressed and formed by the pressing assembly A17. The structure of the pressed powder metallurgy blank N37 is as Figures 33 - 34 shown; Among them, in step S31, when the first pressing block 29 presses the metal powder in the mold 7 into the upper semi-blank 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 applied by the first pressing block 29 from causing the two strip-shaped blocks 10 to bend downward; in step S35, when the second pressing block 34 presses the metal powder in the docking mold 31 into the lower semi-blank 36, since the upper semi-blank 35 and the first pressing block 29 both resist the inner ends of the two strip-shaped blocks 10, overcoming the pressure from the second pressing block 34, thus effectively preventing the force applied by the second pressing block 34 from causing the inner ends of the two strip-shaped blocks 10 to bend upward, and further ensuring that the two inner sinking grooves 2 in the powder metallurgy blank N37 composed of the upper semi-blank 35 and the lower semi-blank 36 are both in a horizontal state.

[0028] It can be seen from this that the powder metallurgy blank N37 pressed by this high-precision continuous pressing device, compared with the powder metallurgy blank M1 pressed as shown in Figures 3 - 8 shown, the two inner sinking grooves 2 in the pressed powder metallurgy blank N37 are both in a horizontal state and there is no inclination, thus greatly improving the pressing and forming quality of the powder metallurgy blank, having the technical advantage of higher pressing accuracy, and thus ensuring that the pressed powder metallurgy blank can meet the requirements of high-end customers.

[0029] S4. Removal of the first powder metallurgy blank N37, and its specific operation steps: 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 outwards, and the strip-shaped blocks 10 gradually withdraw from the powder metallurgy blank N37. When 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 shown in Figure 35 shown; S42. Control the piston of the first pressing oil cylinder 28 of the pressing assembly A17 to retract upwards. The piston drives the first pressing block 29 to move upwards. 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 shown in Figure 36 shown; S43. Control the piston of the second pressing oil cylinder 33 of the pressing assembly A17 to extend upwards. The piston drives the second pressing block 34 to move upwards. The second pressing block 34 pushes the powder metallurgy blank N37 upwards. When 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 shown in Figure 37 shown. At this time, the worker takes away the powder metallurgy blank N37, and the taking-away direction is asFigure 37 as indicated by the arrow in the figure; 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 close to 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 turn off. 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; S6. The worker repeats the operation of step S5 many times, and then the required number of powder metallurgy blanks N37 can be continuously and uninterruptedly pressed and formed by the alternately working pressing assembly A17 and pressing assembly B16.

[0030] 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. It can be seen from this that this high-precision continuous pressing and forming device, compared with the pressing method as Figures 3 - 8 shown, realizes continuously pressing and forming the required number of powder metallurgy blanks N37 for customers in a short time, without the worker pressing out the powder metallurgy blanks one by one, thus greatly improving the pressing and forming efficiency of the powder metallurgy blanks.

[0031] 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 recorded 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 in the protection scope of the present invention.

Claims

1. A high-precision continuous pressing device for powder metallurgy blanks with an inner sink, characterized in that: It comprises a hydraulic motor (14) fixedly mounted on the bottom surface of a workbench (13); an output shaft of the hydraulic motor (14) passes through the workbench (13) in an upward direction; a rotating table (15) supported on the table surface of the workbench (13) is fixedly mounted on an extended end; a pressing assembly B (16) and a pressing assembly 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) comprises an L-shaped support (18) and a cushion block (19) fixedly mounted on the rotating table (15); a vertical through slot (20) and a horizontal through slot (21) are respectively provided in the vertical seat and the horizontal seat of the L-shaped support (18); two lifting cylinders (22) are fixedly mounted on the top surface of the L-shaped support (18) and are respectively located on the left and right sides of the horizontal through slot (21); the piston rods of the two lifting cylinders (22) both penetrate downwardly through the horizontal seat, and are fixedly connected to lifting seats (23) on the extended ends; a guide rod (24) is slidably penetrated in the lifting seat (23) located on the right side; a feed cylinder (25) is fixedly mounted on the left end surface of the lifting seat (23) located on the left side and penetrates the vertical through slot (20) to the left; a frame (26) is welded between the action end of the piston rod of the feed 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 to the middle of the frame (26); two horizontal oil cylinders (9) respectively located on the left and right sides of the mold (7) are fixed in the frame (26); strip blocks (10) are fixed on the active ends of the piston rods of the two horizontal oil cylinders (9); the inner ends of the two strip blocks (10) extend into the inner cavity (8) of the mold (7); a bracket (27) penetrating upwardly through the horizontal through groove (21) is fixed on the top surface of the frame (26); a first pressurizing oil cylinder (28) is fixed on the top wall of the bracket (27); a first pressurizing block (29) located directly above the mold (7) is fixed on the active end of the piston rod of the first pressurizing oil cylinder (28); A column (4) located directly below the mold (7) is fixedly provided 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 provided on the top surface of the cushion block (19). A docking mold (31) is fixedly provided between the action ends of the piston rods of the two vertical oil cylinders (30). A step groove (32) penetrating the top and bottom surfaces of the docking mold (31) is provided in the docking mold (31). A second pressurizing oil cylinder (33) is fixedly provided on the bottom surface of the docking mold (31). The piston rod of the second pressurizing oil cylinder (33) extends into a small groove of the step groove (32), and a second pressurizing block (34) slidably matched with the step groove (32) is fixedly provided on the extended end.

2. The high-precision continuous pressing device for powder metallurgy blanks with inner sinks according to claim 1, characterized in that: A plurality of legs supported on the ground are fixedly arranged on the bottom surface of the workbench (13).

3. The high-precision continuous pressing device for powder metallurgy blanks with inner sinks according to claim 2, characterized in that: The pressing assembly A (17) and the pressing assembly B (16) are arranged symmetrically with respect to the hydraulic motor (14).

4. The high-precision continuous pressing device for powder metallurgy blanks with inner sinks according to claim 3, characterized in that: A guide hole is provided 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 device for powder metallurgy blanks with inner sinks according to claim 4, characterized in that: The two horizontal oil cylinders (9) are symmetrical with respect to the mold (7), and the two strip blocks (10) are symmetrical with respect to the mold (7). The cross section of the strip blocks (10) is rectangular.

6. The high-precision continuous pressing device for powder metallurgy blanks with inner sinks according to claim 5, characterized in that: The outer contour of the first pressure block (29) matches the inner cavity (8) of the mold (7), and the diameter of the first pressure block (29) is equal to the diameter of the second pressure block (34); the column (4) matches the inner cavity (8) of the mold (7); and the large groove of the step groove (32) matches the outer contour of the mold (7).

7. The high-precision continuous pressing device for powder metallurgy blanks with inner sinks according to claim 6, characterized in that: Two vertical oil cylinders (30) are fixedly arranged on the top surface of the cushion block (19), a mounting plate is fixedly arranged between the action ends of the piston rods of the two vertical oil cylinders (30), the docking die (31) is welded to the middle of the mounting plate, and the docking die (31) passes through the top and bottom surfaces of the mounting plate.

8. The high-precision continuous pressing device for powder metallurgy blanks with inner sinks according to claim 7, characterized in that: The high-precision continuous pressing and forming device also includes a controller, which is electrically connected to the hydraulic motor (14), the lifting cylinder (22), the feeding cylinder (25), the horizontal cylinder (9), the first pressurizing cylinder (28), the vertical cylinder (30) and the second pressurizing cylinder (33) via a signal line.

9. A method for high-precision continuous pressing of a powder metallurgy blank with an inner sink groove, using the high-precision continuous pressing device for a powder metallurgy blank with an inner sink groove according to claim 8, 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, a worker stands at the front side of the workbench (13), and adds a portion of the weighed metal powder from top to bottom into the step groove (32) of the docking die (31) of the pressing assembly A (17). When the adding is completed, the portion of the metal powder is supported on the top surface of the second pressurizing block (34) and fills the small groove of the step groove (32); S12, the piston rods of the two lifting cylinders (22) of the control pressing component A (17) are extended downward at the same time, and the piston rods drive the lifting seat (23) to move downward. The lifting seat (23) on the left side drives the feed cylinder (25) to move downward. At the same time, the lifting seat (23) on the right side 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 pressurizing cylinder (28), the two horizontal cylinders (9) and the two strip blocks (10) to move downward synchronously. When the piston rod of the lifting cylinder (22) is extended to the set stroke, the controller controls the lifting cylinder (22) to close. At this time, the lower end of the inner cavity (8) of the mold (7) is just sleeved on the outside of the column (4), and the top surface of the column (4) is in contact with the bottom surface of the inner end of the two strip blocks (10); S13, the worker adds another portion of the weighed metal powder from top to bottom into the inner cavity (8) of the mold (7) of the pressing component A (17). After the addition is completed, this portion of the metal powder is supported on the top surface of the column (4) and covers the inner ends of the two strip blocks (10), thereby finally filling the pressing component A (17) with the 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 a horizontal plane close to the table surface of the workbench (13), and the rotating table (15) drives the pressing component A (17) and the pressing component B (16) to rotate synchronously. When the rotating table (15) rotates 180 degrees, the controller controls the hydraulic motor (14) to turn off. At this time, the pressing component A (17) moves to the left side of the workbench (13), and the pressing component B (16) 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 component B (16); S3, pressing and forming a first powder metallurgy blank N through the pressing assembly A (17), wherein the specific operation steps are as follows: S31, controlling the piston rod of the first pressurizing cylinder (28) of the pressing assembly A (17) to extend downward, the piston rod drives the first pressurizing block (29) to move downward, the first pressurizing block (29) extends from top to bottom into the inner cavity (8) of the mold (7) and gradually pressurizes the metal powder, and under the pressure, the metal powder becomes dense; when the piston rod of the first pressurizing cylinder (28) extends downward to a set stroke, the controller controls the first pressurizing cylinder (28) to close, thereby pressing the metal powder in the mold (7) into an upper half blank (35) with two inner sinks (2); S32, the piston rods of the two lifting cylinders (22) of the control pressing assembly A (17) are simultaneously retracted upward, 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 cylinder (28), the two horizontal cylinders (9) and the two strip blocks (10) to move upward synchronously, the mold (7) gradually detaches from the column (4), and at the same time, the mold (7) also drives the upper half blank (35) to move upward synchronously, and when the piston rod of the lifting cylinder (22) is completely retracted, the mold (7) moves just above the column (4); S33, control the piston rod of the feed cylinder (25) of the pressing assembly A (17) to extend to the left, the piston rod drives the frame (26) to move to the left, the frame (26) drives the mold (7), the first pressurizing cylinder (28), the two horizontal cylinders (9) and the two strip blocks (10) to move to the left synchronously, the mold (7) drives the upper half blank (35) to move to the left synchronously, and when the piston rod of the feed cylinder (25) is fully extended, the mold (7) moves just above the step groove (32) of the docking mold (31); S34, the piston rods of the two vertical oil cylinders (30) of the control pressing assembly A (17) are extended upward, the piston rods drive the mounting plate to move upward, the mounting plate drives the docking die (31) to move upward, the docking die (31) drives the second pressurizing oil cylinder (33), the second pressurizing block (34) and the metal powder therein to move upward synchronously, when the piston rod of the vertical oil cylinder (30) is fully extended, the large groove of the docking die (31) is just sleeved on the lower end of the die (7), and the step groove (32) of the docking die (31) is connected to the inner cavity (8) of the die (7); S35, controlling the piston rod of the second pressurizing cylinder (33) of the pressing component A (17) to extend upward, the piston rod drives the second pressurizing block (34) to move upward, the second pressurizing block (34) pushes the metal powder in the docking die (31) upward into the inner cavity of the mold (7), and under the gradual pressure of the second pressurizing block (34), the metal powder is gradually pressed onto the upper half blank (35); when the piston rod of the second pressurizing cylinder (33) extends to a set stroke, the controller controls the second pressurizing cylinder (33) to close, thereby pressing the metal powder in the docking die (31) into a lower half blank (36) connected to the upper half blank (35), the lower half blank (36) and the upper half blank (35) together constitute a powder metallurgy blank N (37), and finally the first powder metallurgy blank N (37) with two inner sinks (2) is pressed and formed by the pressing component A (17); S4, taking away the first powder metallurgy blank N (37), the specific operation steps are: S41, controlling the piston rods of the two horizontal oil cylinders (9) of the pressing assembly A (17) to retract, so that the piston rods drive the strip block (10) to move outward, and the strip block (10) gradually withdraws from the powder metallurgy blank N (37). When the piston rods of the horizontal oil cylinders (9) are completely retracted, the strip block (10) can be completely withdrawn from the powder metallurgy blank N (37); S42, controlling the piston rod of the first pressurizing cylinder (28) of the pressing assembly A (17) to retract upward, so that the piston rod drives the first pressurizing block (29) to move upward, and the first pressurizing block (29) is first separated from the powder metallurgy blank N (37), and then withdraws from the inner cavity (8) of the mold (7); S43, controlling the piston rod of the second pressurizing cylinder (33) of the pressing assembly A (17) to extend upward, the piston rod drives the second pressurizing block (34) to move upward, and the second pressurizing block (34) pushes the powder metallurgy blank N (37) to move upward. When the piston rod of the second pressurizing cylinder (33) is fully extended, the powder metallurgy blank N (37) is just ejected to the outside of the mold (7) by the second pressurizing block (34). At this time, the worker takes away the powder metallurgy blank N (37); S5, the worker controls the hydraulic motor (14) to start, and the output shaft of the hydraulic motor (14) drives the rotating table (15) to rotate on a horizontal plane close to the table surface of the workbench (13), and the rotating table (15) drives the pressing component A (17) and the pressing component B (16) to rotate synchronously. When the rotating table (15) rotates 180 degrees, the controller controls the hydraulic motor (14) to turn off. At this time, the pressing component A (17) moves to the right side of the workbench (13), and the pressing component B (16) moves to the left side of the workbench (13); then the worker fills new metal powder into the pressing component A (17) again, and then the worker repeats the operation of steps S3 to S4 once, thereby pressing out a second powder metallurgy blank N (37) through the pressing component B (16); S6. The worker repeats the operation of step S5 for multiple times, and the required number of powder metallurgy blanks N (37) can be continuously and uninterruptedly pressed by the pressing assembly A (17) and the pressing assembly B (16) working alternately.

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