CN214639983U - Novel small-tonnage servo press - Google Patents

Abstract

The utility model relates to the technical field of forging machinery, in particular to a novel small-tonnage servo press, wherein the frame is a press frame, a first linear motor is arranged at the upper right part of the press frame, and a workbench is arranged on the press frame; the workbench comprises an upper workbench and a lower workbench; the upper die moving assembly is arranged above the upper workbench in a vertically sliding manner and is connected with the first linear motor through a force increasing mechanism; the servo die pad is arranged on the top workbench and driven by a second linear motor. The utility model has the advantages that: the structure is simple, the installation is convenient, and transmission devices such as a reduction box and the like are omitted; the clearance is reduced, and the transmission structure is reduced, so that the clearance between the teeth is eliminated; the linear motor is used as a power source of the servo die pad, so that the internal space of the servo die pad can be saved, the transmission structural form inside the servo die pad is reduced, and the transmission efficiency of the servo die pad is improved.

Description

Novel small-tonnage servo press

Technical Field

The utility model relates to a forging and pressing machinery technical field, in particular to novel small-tonnage servo press.

Background

The press machine is a numerical control forging and pressing processing device for forming a workpiece, and is widely applied to various fields including various fields of aviation, aerospace, automobiles and household appliances. A common servo press is driven by a rotary motor, and a transmission system in a general condition comprises a crank connecting rod or a ball screw, so that rotary motion is changed into linear motion, and a sliding block is driven to move up and down. The servo press has the advantages of flexible processing, low noise, energy conservation, high forming quality, prolonged service life of a die and the like.

Compared with a CN104029408A patent, a symmetrical toggle rod lining increasing high-speed press driven by a cylindrical linear motor and a CN104129087A square linear motor push-down type double-swing-rod lining increasing high-speed press, the two presses are provided with a driving mode that the linear motor is used as a main motor, the structural form of the two presses adopts a triangular toggle rod type structure, the structural form of the two presses adopts a multi-swing-rod type structure to increase force, enough punching force can be obtained, but in a small press, especially in a press structure below 300 tons, the width of the press can be seriously influenced by the design of the symmetrical toggle rod, and the width of the press is greatly increased compared with that of the existing standard press. The two-stage boosting numerical control press driven by the CN104015388B linear motor of Suzhou university adopts a plurality of link mechanisms for boosting and amplifying, and is still not suitable for a small servo press.

The two machine tools of Jinan CN102632124A describes a die pad of a servo press, adopts a rotary servo motor as a power source of the die pad, and uses a hydraulic buffer device in a matching way.

Therefore, the application designs a crank servo press based on a linear motor, wherein a mover of the linear motor is equivalent to replace a moving device from rotary motion to linear motion, and the servo press has the advantages that: the structure is simple, the installation is convenient, and transmission devices such as a reduction box and the like are omitted; the clearance is reduced, and the transmission structure is reduced, so that the clearance between the teeth is eliminated; the linear motor is used as a power source of the servo die pad, so that the internal space of the servo die pad can be saved, the transmission structural form inside the servo die pad is reduced, and the transmission efficiency of the servo die pad is improved.

Disclosure of Invention

The utility model discloses a remedy exist not enough among the middle-size and small-size press of prior art, provide a neotype servo press.

The utility model discloses a realize through following technical scheme:

the utility model provides a novel small-tonnage servo press, includes the frame, workstation, last mould motion subassembly and servo die cushion, its characterized in that:

the frame is a press machine frame, a first linear motor is arranged at the upper right part of the press machine frame, and a workbench is arranged on the press machine frame;

the workbench comprises an upper workbench and a lower workbench;

the upper die moving assembly is arranged above the upper workbench in a vertically sliding manner and is connected with the first linear motor through a force increasing mechanism;

the servo die pad is arranged on the top workbench and driven by a second linear motor.

Further, for better realization the utility model discloses, first linear electric motor's horizontal fixed connection of stator is in the upper right portion of press frame, and first linear electric motor's active cell stretches out in the middle of the stator tip, and force amplifier is connected to the active cell.

Further, for better realization the utility model discloses, force amplification mechanism includes the first connecting rod with first linear electric motor's active cell round pin hub connection, and the one end of first connecting rod is through the round pin hub fixation with the one end of second connecting rod and third connecting rod, and the other end of second connecting rod passes through connecting rod stiff end round pin hub fixation on press frame upper portion, and the other end of third connecting rod is connected and is gone up mould motion subassembly.

Further, for better realization the utility model discloses, go up the bracing piece that mould motion subassembly includes swing joint third connecting rod, the other end fixed connection slider of bracing piece, the left and right sides of slider is equipped with the guide rail, and the guide rail is installed in the press frame, and the downside of slider is fixed with the mould of going up.

Further, for better realization the utility model discloses, the third connecting rod other end is the bulb, forms with the tile seat of bracing piece and is connected.

Further, for better realization the utility model discloses, second linear electric motor fixed connection is on the workstation down, and the second linear electric motor upwards drives and is connected with servo die cushion, servo die cushion includes the apical cap with second linear electric motor's active cell upper end rigid connection, and apical cap side-mounting has pressure sensor, and the lower part of left ejector pin and right ejector pin is installed on the apical cap, and the outside lower extreme of left guide pillar and right guide pillar is fixed in the frame of workstation down, and apical cap downside is connected to the inside upper end of left guide pillar and right guide pillar, and the work piece is placed to the higher authority of left ejector pin and right ejector pin.

The utility model has the advantages that:

1. the linear motor is used as a power source, and compared with a transmission system of a rotating motor and a crankshaft device, the linear motor greatly reduces the clearance and transmission fit of the system, and improves the control precision;

2. compared with a double-toggle-rod force boosting mechanism, the structure provided by the patent is more suitable for the design of a small-sized press, and is more attractive;

3. the mechanical press machine is upgraded and modified, has a simple structure and is beneficial to realization.

Drawings

FIG. 1 is a graph showing the relationship between the stroke of the servo die pad and the die pad pressure according to the present invention;

FIG. 2 is a schematic structural view of a small-tonnage servo press of the present invention;

fig. 3 is a graph showing the relationship between the speed, pressure and position control of the servo die pad and the stroke curve of the slide block according to the present invention.

In the figure, the position of the upper end of the main shaft,

1. the device comprises a connecting rod fixing end, 2, a first connecting rod, 3, a second connecting rod, 4, a third connecting rod, 5, a supporting rod, 6, a left guide rail, 7, a left side rack, 8, a sliding block, 9, an upper die, 10, a workpiece, 11, a lower die, 12, a left ejector rod, 13, an ejector crown, 14, a left guide pillar, 15, a lower workbench, 16, a second linear motor, 17, a right guide pillar, 18, a right ejector rod, 19, a right guide rail, 20, a right side support, 21, a first linear motor, 22, an upper workbench, 23 and a pressure sensor.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which the product of the present invention is usually placed in when in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Fig. 1-3 show a specific embodiment of the present invention, which has the following scheme: a linear motor driven press with a one-stage force-increasing mechanism comprises a workbench fixed on a frame and an upper die moving assembly which is arranged on the press in a vertically sliding manner and is positioned above the workbench. The press machine comprises a linear motor fixedly arranged above the workbench, and the linear motor comprises a stator and a rotor. The press machine also comprises a force increasing mechanism, wherein the force increasing mechanism comprises a connecting rod, one end of the connecting rod is rotatably connected to the upper part of the upper die moving assembly. The other ends of the connecting rods are respectively connected with two ends, one end of one connecting rod is fixed on a frame of the press machine, and one end of the other connecting rod is fixed on a sliding block which slides up and down. The installation and distribution of the linear motors are required to be within the movable angle range of the connecting end of the force-increasing mechanism and are limited by the movement of the force-increasing mechanism. The stator is arranged above the frame, the rotor can move along the horizontal direction, the press machine comprises a linear motor fixed below the workbench, the stator is arranged below the workbench, the rotor can move along the vertical direction, the top crown and the ejector rod on the top crown can move along the direction of the rotor, and the guide pillar can keep the top crown not to incline left and right.

Referring to fig. 2, a stator of the first linear motor 21 is fixed at the upper right portion of the press frame, a rotor of the first linear motor 21 extends out from the middle of the end portion of the stator, one end of the rotor is connected with one end of the first connecting rod 2, and the first connecting rod is connected with one end of the first linear motor 21 through a pin shaft, and the pin shaft can rotate freely. The connecting rod fixing end 1 fixes one end of the second connecting rod 3 on the upper part of the frame of the press machine through a pin shaft, and the pin shaft can rotate freely, but the rotation angle is limited by a mechanical structure. One end of the second connecting rod 3, one end of the first connecting rod 2 and one end of the third connecting rod 4 are fixed through pin shafts. The other end of the third connecting rod 4 is a ball head and is connected with a tile seat of the supporting rod 5, the other end of the supporting rod 5 is fixedly connected with the sliding block 8 through hard connection, and the left guide rail 6 and the right guide rail 19 are respectively contacted with the left rack 7 and the right rack 20 to keep the sliding block 8 not to incline when vertically sliding. The upper die 9 is fixed on the lower side of the slide block 8.

The first linear motor 21 is used for providing a power source by means of the mover, and the first connecting rod 2, the second connecting rod 3 and the third connecting rod 4 form a force increasing mechanism of the press machine, so that the force provided by the power is amplified and is applied to the supporting rod 5, and the force provided by the power is amplified. The support rod 5 plays a role of power transmission, and the amplified force of the connecting rod is applied to the slide block 8. The lower table 22 is used for placing the mold and the work piece while receiving a lower pressure of a small tonnage. The slide block 8 is used for installing and fixing the upper die of the die and providing a low-tonnage downward pressure. The frames 7 and 20 provide mechanical support for the press with the slide pressed down and mechanical support for the whole press. The connecting rod fixing end 1 provides a fixing point for the connection of the connecting rod 1.

To explain kinematically, the first linear motor 21 drives the slider to move by means of the left and right movements of the mover. When the mover of the first linear motor 21 synchronously moves to the left, the first link 2 and one end of the third link 4 both synchronously move upwards, and one end of the first link 2 moves along the axial line of the mover of the first linear motor 21. The other end of the third connecting rod 4 moves upwards along the axial lead of the supporting rod 5 due to being driven by the end part of the first connecting rod 2, and the supporting rod 5 passively pulls up the sliding block 8, and finally the sliding block 8 moves upwards integrally. The descending path and the transmission mode are just opposite to the ascending path, and the description is omitted. When the first connecting rod 2 and the third connecting rod 4 are both at a vertical angle, the mover of the first linear motor 21 of the press is at the right limit of the position, and the rod lengths of the first connecting rod 2, the second connecting rod 3 and the third connecting rod 4 need to be considered at the left limit of the first linear motor 21 of the press.

As shown in fig. 2, the stator of the second linear motor 16 is fixed on the lower table 15, the upper end of the mover of the second linear motor 16 is rigidly connected to the crown 13, the pressure sensor 23 is installed on the side surface of the crown 13, the lower parts of the left and right push rods 12 and 18 are installed on the crown 13, the outer lower ends of the left and right guide pillars 14 and 17 are fixed on the frame of the lower table 15, the inner upper ends of the guide pillars 14 and 17 are connected to the lower surface of the crown 13, and the workpiece 10 to be processed is placed on the upper surfaces of the left and right push rods. When the mover of the second linear motor 16 moves upward, the crown 13 is lifted up, and the left and right lift pins 12 and 18 are also gradually lifted up, and the workpiece 10 is also gradually lifted up by the left and right lift pins.

A pressure sensor 23 is arranged in a servo die pad of the servo press, pressure signals are fed back, pressure control is achieved, and any pressurizing force can be generated by combining the position of the sliding block 8. In this embodiment, as shown in fig. 3 below, by controlling, the linear motion of the servo die pad can be controlled, including position, speed, pressure, etc., and before the process of the slider contacting the workpiece, the servo pad starts from position 1, and pre-accelerates the die pad to position 2 in advance, where the slider running position and the servo pad running position coincide, and since the slider running speed and the servo pad speed are the same, the relative speed between the slider and the servo pad is 0, so that the servo die pad and the slider are in non-impact contact. After the contact, the sliding block presses the top crown 13 to drive the servo die pad to move downwards, at the moment, the second linear motor 16 generates reverse torque to be in a power generation state, the edge pressing force is established before stretching by combining the operation position of the sliding block, the position control is converted into pressure control at the position 3, the pressure sensor 23 feeds back a pressure signal to control the output torque of the second linear motor 16, and therefore the edge pressing force is controlled and adjusted to generate any pressurizing force.

The servo die pad can be adjusted randomly according to the requirement of the workpiece on the edge pressing force, and the wrinkling and the tensile cracking during the maximum deformation are prevented when the stretching is started. When the sliding block returns, the servo die cushion can maintain pressure for a certain time at the bottom dead center and can move together with the sliding block or independently relative to the sliding block, so that the workpiece is ejected out, the workpiece is taken at a waiting position, and the workpiece returns to the upper stroke position of the servo die cushion. By controlling the torque and the running speed output by the second linear motor 16, the pressure at the position of the servo die pad and the running speed of the drawing pad can be adjusted at will to adapt to the drawing process of different workpieces, the blank pressing force of each point is adjusted independently, and the function of the servo die pad is completely realized.

The descending in-process of conventional servo press slider, go up the descending and the collision contact in-process of work piece and lower mould of mould, partial atress is unbalanced about the slider, through the long-time accumulation many times, causes slider self slope, can seriously influence the shaping quality, and the mould can be damaged to serious condition. In addition, when the left and right unbalance loading is serious, and the pressure tonnage difference of the left and right sides is large, the left and right abrasion of the sliding block is inconsistent, and the forming process of the sliding block is influenced.

The servo die pad of the embodiment has the advantages that as shown in fig. 1, the pressurizing force of the servo die pad can be continuously adjusted according to the descending position of the slide block of the servo press, so that the drawing forming quality of the workpiece is improved.

The application problem among the small-size press in the background art has been solved to this embodiment, and symmetrical toggle link, booster mechanism's transmission mode and servo die cushion carry out the pertinence promotion: the problem that the design width of the four patents is too wide in the application of a small-sized press can be effectively solved, and the four patents adopt a mode of a single-side toggle rod to carry out reinforcement amplification; the servo press is transformed under the condition of keeping the transmission form of the existing mechanical press as much as possible, the structure of a crank connecting rod is kept, and the linear motor is directly used for replacement; the servo-transformation device is suitable for servo transformation of a mechanical press and is beneficial to reducing the change of a press body.

For the servo die pad based on the linear motor, the control of the servo die pad can be directly finished by controlling the position, the speed and the moment of the linear motor. In the middle process of the mechanical structure, the direction of transmission systems such as a screw rod and the like is not required to be changed, and the reliability of the system is improved. The control process is simple and clear, and the servo die pad can be controlled by using the servo linear motor controller.

Because the whole system adopts the linear servo motor as a driving system, the servo press machine has no potential safety hazard of hydraulic oil leakage.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent replacements made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims (6)

1. The utility model provides a novel small-tonnage servo press, includes the frame, workstation, last mould motion subassembly and servo die cushion, its characterized in that:

the frame is a press machine frame, a first linear motor (21) is arranged at the upper right part of the press machine frame, and a workbench is arranged on the press machine frame;

the working table comprises an upper working table (22) and a lower working table (15);

the upper die moving assembly is arranged above the upper workbench (22) in a vertically sliding manner and is connected with the first linear motor (21) through a force increasing mechanism;

the servo die pad is mounted on the top table (15) and driven by a second linear motor (16).

2. The novel small tonnage servo press of claim 1, characterized in that:

the stator of the first linear motor (21) is horizontally and fixedly connected to the right upper part of the press machine frame, the rotor of the first linear motor (21) extends out of the middle of the end part of the stator, and the rotor is connected with the force-increasing mechanism.

3. The novel small tonnage servo press of claim 2, characterized in that:

the force increasing mechanism comprises a first connecting rod (2) connected with a rotor pin shaft of a first linear motor (21), one end of the first connecting rod (2) is fixed with one ends of a second connecting rod (3) and a third connecting rod (4) through pin shafts, the other end of the second connecting rod (3) is fixed on the upper portion of a frame of the press machine through a connecting rod fixing end (1) pin shaft, and the other end of the third connecting rod (4) is connected with an upper die movement assembly.

4. The novel small tonnage servo press of claim 3, characterized in that:

go up mould motion subassembly and include bracing piece (5) of swing joint third connecting rod (4), other end fixed connection slider (8) of bracing piece (5), the left and right sides of slider (8) is equipped with the guide rail, and the guide rail is installed in the press frame, and the downside of slider (8) is fixed with mould (9).

5. The novel small tonnage servo press of claim 4, characterized in that:

the other end of the third connecting rod (4) is a ball head and is connected with a tile seat of the supporting rod (5).

6. The novel small tonnage servo press of claim 1, characterized in that:

the second linear motor (16) is fixedly connected to the lower workbench (15), the second linear motor (16) is connected with a servo die pad in an upward driving mode, the servo die pad comprises a top crown (13) which is rigidly connected with the upper end of a rotor of the second linear motor (16), a pressure sensor (23) is installed on the side face of the top crown (13), the lower portions of a left ejector rod (12) and a right ejector rod (18) are installed on the top crown (13), the outer lower ends of a left guide pillar (14) and a right guide pillar (17) are fixed on a rack of the lower workbench (15), the inner upper ends of the left guide pillar (14) and the right guide pillar (17) are connected with the lower side of the top crown (13), and a workpiece (10) is placed on the upper portions of the left ejector rod (12) and the right ejector rod (18).

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