Driving oil cylinder and powder forming press

Abstract

The utility model discloses a driving oil cylinder and a powder forming press, and belongs to the technical field of powder metallurgy forming. A cylinder body of the driving oil cylinder is provided with a first oil hole and a second oil hole, a piston is movably arranged in the oil cylinder and is provided with a rotating cavity and a connecting pipeline, and the connecting pipeline is communicated with the rotating cavity and the interior of the cylinder body; the lead screw is arranged in the rotating cavity and can rotate along with movement of the piston, and a first threaded sleeve is arranged at the end, away from the piston, of the lead screw. The reversing valve is provided with a first oil outlet hole and a second oil outlet hole, the first oil outlet hole is used for conveying hydraulic oil to the first oil hole, and the second oil outlet hole is used for conveying hydraulic oil to the second oil hole; one end of the reversing rod is movably arranged in the first threaded sleeve, and the other end of the reversing rod penetrates through the reversing valve to be connected with a driving motor. According to the powder forming press, the positioning precision and the positioning stability of the powder forming press can be improved at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy forming, in particular to a driving oil cylinder and a powder forming press. Background Art

[0002] Powder metallurgy forming is a forming technology that determines the pressing process based on the product shape and raw material characteristics. At present, all powder metallurgy forming equipment uses hydraulic power with valves and traditional cylinder actuators as pressure sources. There are usually two specific control methods for the equipment. One is to use a proportional reversing valve or a servo reversing valve for position closed-loop control, and the other is to directly use servo pump control as position closed-loop control. Both methods have their own advantages and disadvantages. The advantage of the system using proportional valves or servo valves is that the actuator has high bidirectional positioning. The disadvantage is that the system requires constant temperature and pressure, and is easily affected by oil temperature and or external interference, resulting in unstable accuracy. The advantage of using servo pump control is that it has the advantages of low heat generation, stable repeatability, etc. compared to the proportional valve system, but the servo pump control system has a fatal disadvantage, which is poor reverse positioning accuracy. Utility Model Content

[0003] The utility model aims to provide a driving oil cylinder and a powder forming press, which combine a digital oil cylinder and a servo pump control to control the moving position, thereby improving the positioning accuracy and positioning stability of the powder forming press at the same time.

[0004] In a first aspect, the utility model provides a driving cylinder, comprising:

[0005] The cylinder body is provided with a first oil hole and a second oil hole,

[0006] A piston is movably disposed in the cylinder body, the piston is provided with a rotating cavity and a connecting pipe, and the connecting pipe communicates the rotating cavity and the interior of the cylinder body;

[0007] A screw rod is arranged in the rotating cavity, the screw rod can rotate along with the movement of the piston, and a first threaded sleeve is arranged at one end of the screw rod away from the piston;

[0008] The reversing valve is provided with a first oil outlet hole and a second oil outlet hole, wherein the first oil outlet hole is used to deliver hydraulic oil to the first oil hole, and the second oil outlet hole is used to deliver hydraulic oil to the second oil hole;

[0009] A reversing rod, one end of which is movably arranged in the first threaded sleeve, and the other end of which passes through the reversing valve and is connected to a driving motor. The reversing rod can move in the reversing valve as the screw rod rotates, and the reversing rod can also move in the reversing valve as the driving motor rotates.

[0010] The driving oil cylinder provided by the utility model can improve the positioning accuracy and positioning stability by repeatedly controlling the movement of the piston through the driving motor and the lead screw.

[0011] Furthermore, the rotating cavity is arranged on the axis of the piston, and the length extension direction of the connecting pipe is arranged to be inclined to the inclined extension direction of the rotating cavity.

[0012] Furthermore, there are multiple connecting pipes, and the multiple connecting pipes are circumferentially spaced around the rotating cavity.

[0013] Furthermore, it also includes a bearing, which is arranged on the opening of the cylinder body, and an avoidance groove is provided on the edge of the bearing. The first oil hole is arranged on the end of the cylinder body, and the second oil hole includes a first section and a second section that are connected. The first section extends from the end of the cylinder body to the bearing, and the second section connects the first section and the avoidance groove.

[0014] In a second aspect, the utility model further provides a powder forming press, comprising:

[0015] Any of the above-mentioned driving cylinders;

[0016] A frame, wherein a working platform is provided in the frame, and the driving cylinder is provided on the frame;

[0017] The punching die assembly is arranged on one end of the piston away from the cylinder body, and the punching die assembly can perform punching on the working platform as the piston moves.

[0018] Furthermore, there are two driving cylinders, which are arranged on the upper and lower sides of the working platform.

[0019] Furthermore, it also includes a magnetizing and demagnetizing component, which is used to eliminate the magnetic field of the material on the working platform.

[0020] Furthermore, the demagnetization assembly includes a demagnetization coil, a connecting block, a threaded rod, a second threaded sleeve and a rotating drive member. The connecting block is movably inserted into the frame, the demagnetization coil is arranged on a side of the connecting block close to the working platform, the second threaded sleeve is arranged on the outside of the frame, one end of the threaded rod is threadedly connected through the second threaded sleeve and is fixedly connected to the connecting block, and the rotating drive member is arranged at one end of the threaded rod away from the connecting block. The rotating drive member can drive the threaded rod to rotate to drive the demagnetization coil to approach or move away from the working platform.

[0021] Furthermore, there are two magnetizing and demagnetizing components, which are arranged on two opposite sides of the working platform.

[0022] Furthermore, the stamping die assembly includes a moving rod, a connecting plate and a stamping die, the moving rods are multiple in number, the multiple moving rods are vertically arranged in the frame, the connecting plate is movably mounted on the multiple moving rods, the stamping die is arranged on a side of the connecting plate close to the working platform, and the piston is arranged on a side of the connecting plate away from the stamping die.

[0023] As can be seen from the above, the driving oil cylinder provided by the utility model can control the movement of the reversing rod in the reversing valve through the driving motor, so that the first oil outlet or the second oil outlet outputs hydraulic oil, thereby driving the piston to move in the cylinder body. The screw rotates with the movement of the piston, and after the screw rotates, it can drive the reversing rod to move and reset, and the reversing valve is closed, and the first oil outlet or the second oil outlet stops outputting hydraulic oil. During the whole process, the driving motor and the screw are in a pulsating state of a micro switch, thereby realizing pulse control of the piston position, which can simultaneously improve the positioning accuracy and positioning stability of the powder molding press.

[0024] In addition, by providing a connecting pipe to connect the rotating cavity, the hydraulic pressure in the cylinder body can enter the rotating cavity through the connecting pipe, which can reduce the hydraulic pressure difference between the rotating cavity and the inside of the cylinder body, thereby improving the movement stability of the piston.

[0025] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The utility model is a schematic structural diagram of a powder forming press.

[0027] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the powder molding press.

[0028] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of the A area of ​​the powder molding press.

[0029] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of the powder molding press from another perspective.

[0030] In the accompanying drawings: 100, frame; 110, working platform; 200, driving cylinder; 210, cylinder body; 211, first oil hole; 212, second oil hole; 2121, first section; 2122, second section; 220, piston; 221, rotating cavity; 222, connecting pipe; 230, reversing valve; 231, first oil outlet hole; 232, second oil outlet hole; 240, driving motor; 250, reversing rod; 260, bearing; 261, avoidance groove; 270, screw rod; 271, first threaded sleeve; 300, stamping die assembly; 310, moving rod; 320, connecting plate; 330, stamping die; 400, charging and demagnetizing assembly; 410, charging and demagnetizing coil; 420, connecting block; 430, threaded rod; 440, first threaded sleeve; 450, rotating drive member. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0033] The utility model discloses a driving oil cylinder which is mainly used to control a punching die assembly in a powder forming press. The driving oil cylinder combines a digital oil cylinder and a servo pump control to control the moving position, which can simultaneously improve the positioning accuracy and positioning stability of the powder forming press.

[0034] Reference Figure 1 , Attachment Figure 2 , Attachment Figure 3In one embodiment, a driving oil cylinder includes: a cylinder body 210, a piston 220, a screw rod 270, a reversing valve 230 and a reversing rod 250. The cylinder body 210 is provided with a first oil hole 211 and a second oil hole 212. The piston 220 is movably arranged in the cylinder body 210. The piston 220 is provided with a rotating cavity 221 and a connecting pipe 222. The connecting pipe 222 connects the rotating cavity 221 and the inside of the cylinder body 210; the screw rod 270 is arranged in the rotating cavity 221. The screw rod 270 can rotate with the movement of the piston 220. The end of the screw rod 270 away from the piston 220 is provided with a first threaded sleeve 271; the reversing valve 230 is provided with a first oil outlet hole 231 and a second oil outlet hole 212. Two oil outlet holes 232, the first oil outlet hole 231 is used to transport hydraulic oil to the first oil hole 211, and the second oil outlet hole 232 is used to transport hydraulic oil to the second oil hole 212; one end of the reversing rod 250 is movably arranged in the first threaded sleeve 271, and the other end of the reversing rod 250 passes through the reversing valve 230 and is connected to the drive motor 240. The reversing rod 250 can move in the reversing valve 230 as the screw rod 270 rotates, and the reversing rod 250 can also move in the reversing valve 230 as the drive motor 240 rotates.

[0035] As can be seen from the above, the driving oil cylinder provided by the utility model can control the reversing rod 250 to move in the reversing valve 230 through the driving motor 240, so that the first oil outlet 211 or the second oil outlet 212 outputs hydraulic oil, thereby driving the piston 220 to move in the cylinder body 210. The screw rod 270 rotates with the movement of the piston 220. After the screw rod 270 rotates, it can drive the reversing rod 250 to move and reset. The reversing valve 230 is closed, and the first oil outlet 231 or the second oil outlet 232 stops outputting hydraulic oil. During the whole process, the driving motor 240 and the screw rod 270 are in a pulsating state of a micro switch, thereby realizing pulse control of the piston position, which can simultaneously improve the positioning accuracy and positioning stability of the powder molding press.

[0036] In addition, by providing a connecting pipe 220 to connect the rotating cavity 221, the hydraulic pressure in the cylinder 210 can enter the rotating cavity 221 through the connecting pipe 222, which can reduce the hydraulic pressure difference between the rotating cavity 221 and the cylinder 210, thereby improving the movement stability of the piston.

[0037] In one embodiment, the rotating cavity 221 is disposed on the axis of the piston head 221 , and the length extension direction of the connecting pipe 222 is inclined to the inclined extension direction of the rotating cavity 221 .

[0038] In one embodiment, there are multiple connecting pipes 222 , and the multiple connecting pipes 222 are circumferentially spaced around the rotating cavity 221 .

[0039] By adopting the above technical solution, the hydraulic pressure difference between the rotating cavity 221 and the cylinder body 210 can be further reduced by increasing the number of connecting pipes 222 .

[0040] In one embodiment, it also includes a bearing 260, which is arranged on the opening of the cylinder body 210, and an avoidance groove 261 is provided on the edge of the bearing 260. The first oil hole 211 is arranged on the end of the cylinder body 210, and the second oil hole 212 includes a first section 2121 and a second section 2122 that are connected. The first section 2121 extends from the end of the cylinder body 210 to the bearing 260, and the second section 2122 connects the first section 2121 and the avoidance groove 261.

[0041] By adopting the above technical solution, an avoidance groove 261 is provided on the bearing 260, so that the hydraulic oil output from the second oil outlet 231 can enter the cylinder body 210 through the avoidance groove 261. The avoidance groove 261 can guide the hydraulic oil to move toward the piston 220, which helps to improve the driving efficiency.

[0042] Reference Figure 1 , attached Figure 2 The utility model also provides a powder forming press, comprising:

[0043] The driving cylinder 200 of any of the above embodiments;

[0044] A frame 100, a working platform 110 is provided inside the frame 100, and a cylinder body 210 is provided on the frame 100;

[0045] The punching die assembly 300 is disposed on one end of the piston 220 away from the cylinder body 210 , and the punching die assembly 300 can perform punching on the working platform 110 as the piston 220 moves.

[0046] In one embodiment, the number of the driving cylinders 200 is two, and the two driving cylinders 200 are disposed on the upper and lower sides of the working platform 110 .

[0047] Reference Figure 4 In one embodiment, it also includes a demagnetization component 400, which is used to eliminate the magnetic field of the material on the working platform 110.

[0048] By adopting the above technical solution and setting the magnetizing and demagnetizing assembly 400, required materials such as neodymium iron boron can be stamped.

[0049] In one embodiment, the demagnetization assembly 400 includes a demagnetization coil 410, a connecting block 420, a threaded rod 430, a second threaded sleeve 440 and a rotating drive member 450. The connecting block 420 is movably installed on the frame 100. The demagnetization coil 410 is arranged on a side of the connecting block 420 close to the working platform 110. The second threaded sleeve 440 is arranged on the outside of the frame 100. One end of the threaded rod 430 is threadedly connected through the second threaded sleeve 440 and fixedly connected to the connecting block 420. The rotating drive member 450 is arranged at one end of the threaded rod 430 away from the connecting block 420. The rotating drive member 450 can drive the threaded rod 430 to rotate, so as to drive the demagnetization coil 410 to move closer to or away from the working platform 110.

[0050] By adopting the above technical solution, the demagnetization coil 410 can be driven to approach or move away from the working platform 110 by rotating the rotary driving member 450, thereby controlling the demagnetization rate.

[0051] In one embodiment, the number of the magnetizing and demagnetizing components 400 is two, and the magnetizing and demagnetizing components 400 are disposed on two opposite sides of the working platform 110 .

[0052] Reference Figure 2 In one embodiment, the stamping die assembly 300 includes a moving rod 310, a connecting plate 320 and a stamping die 330. There are multiple moving rods 310, and the multiple moving rods 310 are vertically arranged in the frame 100. The connecting plate 320 can be movably mounted on the multiple moving rods 310. The stamping die 330 is arranged on a side of the connecting plate 320 close to the working platform 110, and the piston 220 is arranged on a side of the connecting plate 320 away from the stamping die 330.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0054] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A driving cylinder, characterized in that: include: The cylinder body (210) is provided with a first oil hole (211) and a second oil hole (212). A piston (220) is movably disposed in the cylinder body (210); the piston (220) is provided with a rotation cavity (221) and a connecting pipe (222); the connecting pipe (222) communicates the rotation cavity (221) and the interior of the cylinder body (210); A screw rod (270) is disposed in the rotating cavity (221); the screw rod (270) is capable of rotating along with the movement of the piston (220); a first threaded sleeve (271) is disposed at one end of the screw rod (270) away from the piston (220); The reversing valve (230) is provided with a first oil outlet hole (231) and a second oil outlet hole (232), wherein the first oil outlet hole (231) is used to transport hydraulic oil to the first oil hole (211), and the second oil outlet hole (232) is used to transport hydraulic oil to the second oil hole (212); A reversing rod (250) has one end movably disposed in the first threaded sleeve (271); the other end of the reversing rod (250) passes through the reversing valve (230) and is connected to a drive motor (240); the reversing rod (250) can move in the reversing valve (230) as the screw rod (270) rotates; the reversing rod (250) can also move in the reversing valve (230) as the drive motor (240) rotates.

2. A driving cylinder according to claim 1, characterized in that: The rotating cavity (221) is arranged on the axis of the piston (220), and the length extension direction of the connecting pipe (222) is arranged to be inclined to the inclined extension direction of the rotating cavity (221).

3. A driving cylinder according to claim 1, characterized in that: There are a plurality of connecting pipes (222), and the plurality of connecting pipes (222) are arranged at intervals in the circumferential direction around the rotating cavity (221).

4. A driving cylinder according to any one of claims 1 to 3, characterized in that: The invention also comprises a bearing (260), wherein the bearing (260) is arranged on the opening of the cylinder body (210), and an avoidance groove (261) is arranged on the edge of the bearing (260); the first oil hole (211) is arranged on the end of the cylinder body (210), and the second oil hole (212) comprises a first section (2121) and a second section (2122) which are connected to each other; the first section (2121) extends from the end of the cylinder body (210) to the bearing (260), and the second section (2122) connects the first section (2121) and the avoidance groove (261).

5. A powder molding press, characterized in that: include The driving cylinder (200) according to any one of claims 1 to 4; A frame (100), wherein a working platform (110) is provided inside the frame (100), and the cylinder body (210) is arranged on the frame (100); The punching die assembly (300) is arranged on an end of the piston (220) away from the cylinder body (210), and the punching die assembly (300) can perform punching on the working platform (110) as the piston (220) moves.

6. A powder forming press according to claim 5, characterized in that: The number of the driving cylinders (200) is two, and the two driving cylinders (200) are arranged on the upper and lower sides of the working platform (110).

7. A powder forming press according to claim 5, characterized in that: It also includes a magnetizing and demagnetizing component (400), wherein the magnetizing and demagnetizing component (400) is used to eliminate the magnetic field of the material on the working platform (110).

8. A powder forming press according to claim 7, characterized in that: The demagnetization assembly (400) comprises a demagnetization coil (410), a connection block (420), a threaded rod (430), a second threaded sleeve (440) and a rotation drive member (450); the connection block (420) is movably arranged on the frame (100); the demagnetization coil (410) is arranged on a side of the connection block (420) close to the working platform (110); the second threaded sleeve (440) is arranged outside the frame (100); one end of the threaded rod (430) is threadedly connected through the second threaded sleeve (440) and is fixedly connected to the connection block (420); the rotation drive member (450) is arranged at one end of the threaded rod (430) away from the connection block (420); the rotation drive member (450) is capable of driving the threaded rod (430) to rotate, so as to drive the demagnetization coil (410) to move closer to or farther from the working platform (110).

9. A powder forming press according to claim 7, characterized in that: The number of the magnetizing and demagnetizing components (400) is two, and the magnetizing and demagnetizing components (400) are arranged on two opposite sides of the working platform (110).

10. A powder forming press according to claim 5, characterized in that: The punching die assembly (300) comprises a moving rod (310), a connecting plate (320) and a punching die (330), wherein the moving rod (310) is provided in plurality, the moving rods (310) being vertically arranged in the frame (100), the connecting plate (320) being movably sleeved on the moving rods (310), the punching die (330) being arranged on a side of the connecting plate (320) close to the working platform (110), and the piston (220) being arranged on a side of the connecting plate (320) away from the punching die (330).

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