Upper sliding column pressurizing guide mechanism of powder forming machine

Abstract

The invention discloses an upper sliding column pressurizing guide mechanism of a powder forming machine. The upper sliding column pressurizing guide mechanism comprises an upper sliding column, a guide seat, an anti-rotating guide column, a guide sleeve, an upper cross beam, an upper mold frame connecting plate, a longitudinal driving mechanism and a pressure transmission mechanism, the upper sliding column is sleeved with a guide seat, guide holes are formed in the two sides of the guide seat and the two sides of the upper cross beam, and anti-rotation guide columns are arranged in the guide holes. The lower end of the anti-rotation guide post is fixed with the guide sleeve; the longitudinal driving mechanism is arranged on the upper sliding column and used for driving the upper sliding column to move up and down and acting on the pressure transmission mechanism to transmit loads to the upper cross beam. An upper cylinder piston is arranged at the lower end of the upper beam; the lower end of the upper cylinder piston is connected with the upper mold frame connecting plate, and is sleeved with an upper cylinder body; the upper end of the upper air cylinder body is connected with the upper cross beam, the lower end of the upper air cylinder body is provided with an upper air cylinder cover, and a vent hole is formed in the upper air cylinder cover and used for forward or reverse ventilation of the upper air cylinder piston; the guide precision can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of powder metallurgy equipment, and particularly relates to an upper slide column pressurizing and guiding mechanism of a powder molding machine. Background Art

[0002] The pressing and forming of powder is mainly achieved by the downward movement of the upper punch, which presses the loose powder in the mold through an extrusion die with the same cross-sectional area and shape as the product, thereby forming a semi-finished or finished product with a predetermined geometric shape, size, density, and strength. During the downward pressing process of the upper punch, a specific guiding mechanism is required to maintain the precise perpendicularity between the punch and the workbench to ensure that the pressed product meets the set density and strength requirements.

[0003] In traditional mechanical powder molding machines, the up and down movement of the upper punch mainly relies on the direct drive of the upper cylinder piston. Currently, the up and down movement of the upper cylinder piston is mostly guided by a slider guiding mechanism. The slider guiding mechanism not only has low guiding accuracy but also is difficult to adjust. During the movement of the upper punch, it is prone to tilt, and due to this tilt, the upper cylinder piston is likely to rotate and drive related components to move together. The accumulation of such movements can easily lead to mutual impacts between the components of the entire pressing mechanism and is very likely to cause damage to the mechanism. Summary of the Invention

[0004] In order to solve the problems of low accuracy and difficult adjustment of the existing upper punch slider guiding mechanism, the present invention provides an upper slide column pressurizing and guiding mechanism of a powder molding machine.

[0005] The technical solution for achieving the purpose of the present invention is as follows:

[0006] An upper slide column pressurizing and guiding mechanism of a powder molding machine, comprising: an upper slide column, a guiding seat, an anti-rotation guiding column, a guiding sleeve, an upper cross beam, an upper die holder connecting plate, a longitudinal driving mechanism, and a pressure transmission mechanism;

[0007] The outer part of the upper slide column is sleeved with a guiding seat. Guiding holes are provided on both sides of the guiding seat and the upper cross beam, and anti-rotation guiding columns are arranged in the guiding holes; the lower end of the anti-rotation guiding column is detachably fixed to the guiding sleeve; the guiding sleeve is fixed on the workbench;

[0008] The pressure transmission mechanism includes a hydraulic piston arranged on the upper part of the upper cross beam and a plunger rod connected to the upper part of the hydraulic piston; the hydraulic piston is provided with a hydraulic cylinder block for containing hydraulic oil. The upper end of the hydraulic cylinder block is fixedly connected to the upper slide column, and the lower end is connected to the upper cross beam;

[0009] The longitudinal driving mechanism is arranged on the upper slide column and is used to drive the upper slide column to move up and down and act on the plunger rod to transmit the load to the upper cross beam;

[0010] The lower end of the upper crossbeam is provided with an upper cylinder piston capable of contacting the upper crossbeam; the lower end of the upper cylinder piston is fixedly connected to the upper die holder connecting plate and is externally sleeved with an upper cylinder block; the upper end of the upper cylinder block is fixedly connected to the upper crossbeam, the lower end of the upper cylinder block is provided with an upper cylinder head, and a ventilation hole is arranged in the upper cylinder head for ventilating the upper cylinder piston forward or backward; when ventilating forward, it is used for the downward movement of the upper cylinder piston, so that the upper die punch first contacts the powder to pre-press the powder during the forming process and keeps the position of the upper die punch unchanged during the demoulding process; when ventilating backward, it is used for the upward movement of the upper cylinder piston to complete the demoulding of the upper die punch.

[0011] Compared with the prior art, the remarkable advantages of the present invention are:

[0012] (1) The present invention adopts the guiding mode of sliding columns to replace the original slider guiding, reduces the adjustment difficulty of the original slider guiding, can effectively improve the guiding accuracy, and ensures the precise guiding and smooth operation of the movement of the upper die punch.

[0013] (2) By installing anti-rotation guide columns at both ends of the guide seat, the present invention can prevent the upper crossbeam from rotating during the up and down movement, thereby preventing the upper die punch from tilting during the movement.

[0014] (3) The present invention is provided with adjusting screws below the anti-rotation guide columns, which can be quickly adjusted through the adjusting screws during the guiding under pressure, and at the same time, the anti-rotation guide columns are fixed after the adjustment is completed, greatly increasing the stability of the guiding. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram of the present invention

[0016] Wherein 1 is the upper sliding column, 2 is the guide seat, 3 is the anti-rotation guide column, 4 is the upper crossbeam, 5 is the upper cylinder piston, 6 is the upper cylinder block, 7 is the upper cylinder head, 8 is the upper die holder connecting plate, 9 is the connecting rod, 10 is the ball head screw rod, 11 is the ball bowl piston, 12 is the plunger rod, 13 is the hydraulic piston, 14 is the hydraulic cylinder block, 15 is the copper sleeve, 16 is the guide sleeve, 17 is the turbine, 18 is the worm, and 19 is the adjusting screw. Specific Embodiments

[0017] The following further introduces the present invention in conjunction with the drawings and specific embodiments.

[0018] Combined with Figure 1, the upward sliding column pressurizing and guiding mechanism of a powder molding machine according to the present invention includes an upward sliding column 1, an upper cross beam 4, an upper die holder connecting plate 8, a longitudinal driving mechanism, and a pressure transmission mechanism. A guiding seat 2 is sleeved outside the upward sliding column 1. The guiding seat 2 is composed of a pair of wedge-shaped flanges nested inside and outside. Guiding holes are provided on both sides of the guiding seat 2 and the upper cross beam 4, and anti-rotation guide columns 3 are arranged in the guiding holes; a upper cylinder piston 5 that can contact the upper cross beam 4 is provided at the lower end of the upper cross beam 4. The lower end of the upper cylinder piston 5 is fixedly connected to the upper die holder connecting plate 8. An upper cylinder block 6 is sleeved outside the upper cylinder piston 5. The upper end of the upper cylinder block 6 is fixedly connected to the upper cross beam 4. The lower end of the upper cylinder block 6 is provided with an upper cylinder head cover 7, and an air vent hole is arranged inside the upper cylinder head cover 7; the longitudinal driving mechanism is arranged on the upward sliding column 1 to drive the upward sliding column 1 to move up and down; the pressure transmission mechanism is arranged at the upper end of the upper cross beam 4, and the transmitted pressure will act on the upper cross beam 4.

[0019] The longitudinal driving mechanism described above includes a ball bowl piston 11 connected to the upward sliding column 1. The ball bowl piston 11 is connected to a ball head screw 10 and is driven by the ball head screw 10 to move. The ball head screw 10 is driven by a connecting rod 9 to move up and down.

[0020] The pressure transmission mechanism described above includes a hydraulic piston 13 arranged on the upper part of the upper cross beam 4. A plunger rod 12 connected to it is provided on the upper part of the hydraulic piston 13. The plunger rod 12 is connected to the ball bowl piston 11. The pressure is transmitted through the ball head screw 10. The hydraulic piston 13 is provided with a hydraulic cylinder block 14 for containing hydraulic oil. The upper end of the hydraulic cylinder block 14 is fixedly connected to the upward sliding column 1, and the lower end is connected to the upper cross beam 4. When pressing downward, the pressure is transmitted to the upper cross beam 4 through the hydraulic oil.

[0021] A guiding sleeve 16 is provided at the lower part of the anti-rotation guide column 3. The upper end and the side end of the guiding sleeve 16 are respectively fixedly connected to the anti-rotation guide column 3 by hexagon socket head cap screws and set screws. The lower end of the guiding sleeve 16 is fixed on the workbench.

[0022] Inside the guiding holes opened on both sides of the upper cross beam 4, there are copper sleeves 15 that cooperate with the anti-rotation guide columns 3. The copper sleeves 15 are provided with lubricating oil inlet holes to ensure good lubrication during the operation of the mechanism.

[0023] The lower end of the upper die holder connecting plate 8 is used to connect the upper die punch, and is used to press the powder into a mold during its working process.

[0024] A worm and worm gear mechanism 17, 18 is provided on the ball head screw 10 to enable it to move up and down relative to the connecting rod 9.

[0025] The hydraulic oil contained in the hydraulic cylinder block 14 is sealed by a hydraulic pad and is used to display the magnitude of the transmitted pressure through a pressure sensor.

[0026] The anti-rotation guide column 3 is provided with an adjustment screw 19 connected to the guide sleeve 16. Its function is to loosen the adjustment screw 19 when the downward pressure guide is applied, adjust the installation of the entire mechanism to fine-tune the verticality of the upper die punch and the workbench to meet the accuracy requirements, and then use the adjustment screw 19 to fasten the anti-rotation guide column 3 and the guide sleeve 16.

[0027] The working method of the device of the present invention comprises a guide adjustment process and a formal pressing process:

[0028] (1) Downward pressurization process: The power transmitted by the main motor to the crankshaft drives the crankshaft to rotate clockwise, and drives the upper slide column 1 to move downward through the connecting rod 9, the ball screw 10, and the ball bowl piston 11. When the upper slide column 1 moves downward, the pressure is transmitted to the plunger rod 12 connected to the ball bowl piston 11. The plunger rod 12 presses down the hydraulic piston 13. The pressurized hydraulic piston 13 transmits the pressure to the hydraulic oil in the hydraulic cylinder body 14, and then acts on the upper crossbeam 4.

[0029] (2) Guiding process: The compressed upper crossbeam 4 will move downward along the anti-rotation guide columns 3 on both sides, and compress the piston after contacting the upper cylinder piston 5. The compressed upper cylinder piston 5 will drive the upper die frame connecting plate 8 connected to its lower end to move downward, thereby driving the upper die punch downward until the lower surface of the upper die punch contacts the workbench. Measure the verticality of the upper die punch and the workbench, and fine-tune the verticality between the upper die punch and the workbench by loosening the adjustment screw 19 on the anti-rotation guide column 3. After ensuring that the accuracy meets the requirements, fix the anti-rotation guide column 3 with the hexagon socket bolt at the upper end of the guide sleeve 16 and the set screw at the side end. At this point, the guiding is completed.

[0030] (3) Upward return process: The crankshaft rotates counterclockwise, driving the connecting rod 9 and the ball screw 10 to move upward, driving the upper slide column 1 to move upward. While the upper slide column 1 moves upward, the ball bowl piston 11 connected to the lower end of the ball screw 10 is stretched, and the pulling force is transmitted to the hydraulic piston 13 through the plunger rod 12, thereby driving the hydraulic cylinder body 14 and the upper cross beam 4 to move upward; while the upper cross beam 4 moves upward, air is ventilated into the vent hole provided in the upper cylinder head 7, causing the upper cylinder piston 5 to return upward, thereby driving the upper mold frame connecting plate 8 to move upward, completing the return process.

[0031] (4) During formal pressing, first fill the powder in the female die, and supply positive air to the upper cylinder block 6 through the upper air vent, causing the upper cylinder piston to extend out of the upper cylinder piston 5; the power transmitted by the main motor on the crankshaft drives the crankshaft to rotate clockwise, driving the upper crossbeam 4 to move downward. Before the upper crossbeam 4 contacts the upper cylinder piston 5, the extended upper cylinder piston 5 drives the upper die holder connecting plate 8 and the upper die punch to first contact the powder for preloading to prevent powder diffusion; subsequently, the upper crossbeam 4 contacts the upper cylinder piston 5, and the upper cylinder piston 5 is further pressed downward to drive the upper die punch to press the powder to complete the pressing; after the pressing is completed, when the crankshaft drives the mechanism to return, continue to supply positive air through the upper air vent to keep the upper cylinder piston 5 stationary and continue to contact the product to protect the female die from demolding downward. After the demolding is completed, change the air flow direction in the upper cylinder block 6, and the upper cylinder piston 5 moves upward to complete the demolding of the upper die punch.

[0032] This mechanism can greatly improve the guiding accuracy and running stability of the upper slide column 1 during its up and down movement. At the same time, there is lubricating oil provided in the copper sleeve 15 fitted on the anti-rotation guide post 3 to maintain a good lubrication state of the mechanism, reduce the friction during the up and down movement of the mechanism, and extend the service life of the equipment.

[0033] Although the embodiments of the present invention have been described in detail, those skilled in the art should understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. These changes and improvements fall within the scope of the claimed present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The upper sliding column pressurizing and guiding mechanism of a powder molding machine, characterized in that, Including: An upper sliding column, a guiding seat, an anti-rotation guiding column, a guiding sleeve, an upper cross beam, an upper die holder connecting plate, a longitudinal driving mechanism and a pressure transmission mechanism; The outer part of the upper sliding column is sleeved with the guiding seat. Guiding holes are opened on both sides of the guiding seat and the upper cross beam, and the anti-rotation guiding columns are arranged in the guiding holes; the lower end of the anti-rotation guiding column is detachably fixed to the guiding sleeve; the guiding sleeve is fixed on the workbench; The pressure transmission mechanism includes a hydraulic piston arranged on the upper part of the upper cross beam and a plunger rod connected to the upper part of the hydraulic piston; the hydraulic piston is provided with a hydraulic cylinder body for containing hydraulic oil. The upper end of the hydraulic cylinder body is fixedly connected to the upper sliding column, and the lower end is connected to the upper cross beam; The longitudinal driving mechanism is arranged on the upper sliding column and is used for driving the upper sliding column to move up and down, acting on the plunger rod, and transmitting the load to the upper cross beam; The lower end of the upper cross beam is provided with an upper air cylinder piston capable of contacting the upper cross beam; the lower end of the upper air cylinder piston is fixedly connected to the upper die holder connecting plate, and the outer part is sleeved with an upper air cylinder body; the upper end of the upper air cylinder body is fixedly connected to the upper cross beam, and the lower end of the upper air cylinder body is provided with an upper air cylinder head cover. An air vent hole is arranged in the upper air cylinder head cover for ventilating the upper air cylinder piston forward or backward; when ventilating forward, it is used for the upper air cylinder piston to move downward, so that the upper die punch first contacts the powder to pre-press the powder during the forming process, and keeps the position of the upper die punch unchanged during the demoulding process; when ventilating backward, it is used for the upper air cylinder piston to move upward to complete the demoulding of the upper die punch.

2. The upper slide column pressurizing and guiding mechanism of the powder molding machine according to claim 1, characterized in that The longitudinal driving mechanism includes a ball bowl piston connected to the upper sliding column 1. The ball bowl piston is connected to a ball head screw rod and is driven by the ball head screw rod to move. The ball head screw rod is driven by a connecting rod to move up and down.

3. The upper sliding column pressurizing and guiding mechanism of the powder molding machine according to claim 2, characterized in that, A worm and gear mechanism for enabling the ball head screw rod to move up and down relative to the connecting rod is arranged on the ball head screw rod.

4. The upper sliding column pressurizing and guiding mechanism of the powder molding machine according to claim 1, characterized in that, Adjusting screws for connecting with the guiding sleeve are arranged on the anti-rotation guiding columns and are used for adjusting the perpendicularity between the upper die punch and the workbench.

5. The upper sliding column pressurizing and guiding mechanism of the powder molding machine according to claim 1, characterized in that Copper sleeves matched with the anti-rotation guiding columns are arranged inside the guiding holes opened on both sides of the upper cross beam.

6. The upper sliding column pressure guiding mechanism of the powder molding machine according to claim 1, characterized in that The copper sleeves are provided with lubricating oil inlet holes.

7. The upper slide column pressurizing and guiding mechanism of the powder molding machine according to claim 1, characterized in that, The guiding seat is composed of a pair of wedge-shaped flanges nested inside and outside.

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