Double-stroke stretching press

Abstract

A double-stroke stretching press machine comprises a stroke extending mechanism, an outer sliding block, a main shaft, a sliding block, a stand column, a base, a cam force application mechanism, an upper cross beam and a press machine main shaft driving mechanism. The range extending mechanism is mounted on the upper cross beam and connected with the outer sliding block to drive the outer sliding block to move up and down; the lower ends of the four stand columns are fixed to the base, and the upper ends of the stand columns penetrate through the outer sliding blocks and are fixed to the upper cross beam. The main shaft is rotationally supported by an outer sliding block, and a cam force application mechanism is mounted on the main shaft, is connected with the sliding block and drives the sliding block to move up and down; the press driving mechanism is connected with the spindle and drives the spindle to rotate. According to the invention, the stroke extending mechanism is additionally arranged, so that an existing drawing press can be additionally provided with another stroke provided by the stroke extending mechanism besides a sliding block stroke realized by an existing cam force application mechanism, and the drawing stroke of the drawing press can be increased without increasing a cam, namely, deep drawing is realized without increasing driving power; and the production efficiency can be improved through the range extending mechanism.

Description

Technical Field

[0001] The invention relates to a press, in particular to a double-stroke stretching press. Background Art

[0002] Cam presses are mostly used to process deep-drawn parts of metal sheets. Through the design of the cam profile, they can have a better forming curve to meet the requirements of the part drawing process.

[0003] For existing cam stretching machines, after the stretching force is determined, the stroke of the cam is proportional to the driving power, which means that it can only meet the processing of parts within a certain height range. If it exceeds this range, the stroke of the cam needs to be increased. Increasing the cam stroke also requires configuring a higher-power motor and reduction gearbox to match the demand for greater press drive torque, which will increase equipment costs and reduce the production efficiency of the press. Therefore, there is no stretching press with a large-stroke cam to meet the needs of deep stretching. Therefore, the scope of use of existing stretching presses is also limited. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a double-stroke drawing press, which can increase the stroke of the press through a double-stroke mechanism to achieve deep drawing, thereby making the application range of the press wider.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: A double-stroke stretching press comprises a stroke extension mechanism, an outer slide block, a main shaft, a slide block, a column, a base, a cam force application mechanism, an upper crossbeam and a press main shaft driving mechanism; The range-extending mechanism is installed on the upper crossbeam and connected to the outer slider, driving the outer slider to move up and down; There are four columns, the lower ends of which are fixed on the base, and the upper ends of which pass through the outer slider and are fixed on the upper crossbeam; The main shaft is rotatably supported by the outer slider, on which a cam force applying mechanism is installed, and the cam force applying mechanism is connected to the slider and drives the slider to move up and down; The press drive mechanism is connected to the main shaft and drives the main shaft to rotate; When the press is working, the press driving mechanism drives the main shaft to drive the slider to move downward from the top dead center position through the cam force mechanism. At the same time, the range extending mechanism drives the outer slider to move downward, and drives the slider downward together with the cam force mechanism. When the workpiece starts to be stretched, the range extending mechanism stops or continues to drive the slider downward for a certain distance together with the cam force mechanism and then stops. The cam force mechanism continues to drive the slider downward until the workpiece stretching is completed; after the stretching is completed, the cam force mechanism drives the slider upward, and at the same time, the range extending mechanism drives the slider upward by moving the outer slider upward until the outer slider and the slider stop moving.

[0006] More specifically, the range extender mechanism includes a first motor, a gear transmission mechanism and a connecting rod. The first motor is mounted on an upper cross beam, the upper end of the connecting rod is mounted on an eccentric shaft, and the lower end thereof is connected to an outer slider. The first motor drives the gear transmission mechanism to rotate the eccentric shaft, thereby causing the connecting rod to drive the outer slider to move up and down.

[0007] Preferably, a mold adjusting device is also provided, which includes a plunger cylinder, a fixing seat, an adjusting nut and a nut lifting drive mechanism, wherein the cylinder body of the plunger cylinder is installed on the top of the upper cross beam through the fixing seat, and the plunger is arranged above the column; the upper end of the column passes through the upper cross beam; the adjusting nut is inserted into the outside of the column and is threadedly connected to the upper part of the column, and supports and limits the upper cross beam; the nut lifting drive mechanism is installed on the upper cross beam, and drives the four adjusting nuts on the four columns to rise or fall at the same time.

[0008] More specifically, the nut lifting drive mechanism includes a second motor and an intermediate transmission mechanism. The second motor drives each adjusting nut through the intermediate transmission mechanism, so that four adjusting nuts can be driven simultaneously.

[0009] More specifically, a driving gear is connected to the output shaft of the second motor, the intermediate transmission mechanism is a gear transmission, a large bevel gear is installed on the upper part of the adjusting nut, and the large bevel gear is meshed with the small bevel gear. In this way, the second motor drives the driving gear, which drives the small bevel gear to rotate through the gear transmission of the intermediate transmission mechanism, thereby driving the large bevel gear to rotate, and the large bevel gear carries the adjusting nut up or down along the column.

[0010] Preferably, a plane bearing is provided between the large bevel gear and the fixed seat and is limited by the fixed seat. The plane bearing allows rolling friction when the adjusting nut rotates, thereby reducing the friction force when the adjusting nut rotates and being able to rotate the adjusting nut more effortlessly.

[0011] Preferably, the mold adjusting device further comprises a cushion block, which is sleeved on the column and placed in a groove of the upper beam below the adjusting nut.

[0012] Preferably, a compressive force sensor is further provided inside or below the cushion block, and the compressive force sensor is installed inside the upper cross beam and sleeved outside the column.

[0013] Preferably, the mold adjusting device further comprises an upper bearing and a lower bearing, which are respectively mounted on the upper and lower parts of the adjusting nut and are respectively supported laterally by a fixing seat and an upper cross beam, thereby preventing the adjusting nut from radially moving due to uneven force and thus affecting the life of the adjusting nut.

[0014] Compared with the prior art, the advantages of the present invention are: since a range-extending mechanism is added and the outer slider can be moved up and down through the range-extending mechanism, the existing drawing press can add another stroke provided by the range-extending mechanism in addition to the slider stroke achieved by the existing cam force mechanism, thereby increasing the drawing stroke of the drawing press without increasing the cam, that is, deep drawing can be achieved without increasing the driving power, and the production efficiency can be improved through the range-extending mechanism.

[0015] In addition, the movement processes of the range-extending mechanism and the cam force-applying mechanism can be coordinated with each other through control, so that the entire stroke of the stretching press can be variable and controllable, and the scope of use is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front structural schematic diagram of a double-stroke stretching press according to an embodiment of the present invention.

[0017] Figure 2 The figure is a schematic top view of the structure of a double-stroke stretching press according to an embodiment of the present invention.

[0018] Figure 3 A cross-sectional view of a mold adjusting device for a double-stroke drawing press according to an embodiment of the present invention.

[0019] Figure 4 The present invention is a schematic structural diagram of a double-stroke stretching press extension mechanism according to an embodiment of the present invention.

[0020] Figure 5 The present invention is a structural schematic diagram of a double-stroke stretching press extension mechanism connection method. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1 , Figure 2 As shown, a double-stroke stretching press includes a range extension mechanism 8, a mold adjustment device 6, an outer slide 3, a main shaft 5, a slide 2, a column 4, a base 1, a cam force mechanism 7, an upper crossbeam 9 and a press spindle drive mechanism 10.

[0023] like Figure 1 , 4 As shown in Figures 5 and 6, the range-extending mechanism 8 is installed on the upper crossbeam 9 and connected to the outer slider 3, driving the outer slider 3 and the components installed thereon to move up and down together.

[0024] The range-extending mechanism includes a first motor 801, a gear transmission mechanism 802 and a connecting rod 803. The first motor 801 is installed on the upper crossbeam 9. The upper end of the connecting rod 803 is installed on the eccentric shaft 804, and the lower end is connected to the outer slider 3 through a fixed shaft 805. The first motor 801 drives the gear transmission mechanism 802 to rotate the eccentric shaft 804, so that the connecting rod 803 drives the outer slider 3 to move up and down.

[0025] The range-extending mechanism may also be replaced by other up-and-down driving mechanisms to drive the outer slider 3 to move up and down.

[0026] There are four columns 4 , the lower ends of which are fixed on the base 1 , and the upper ends of which pass through the outer slider 3 and the upper crossbeam 9 .

[0027] The main shaft 5 is rotatably supported by the outer slider 3 , and a cam force applying mechanism 7 is installed on the main shaft 5 . The cam force applying mechanism 7 is connected to the slider 2 and drives the slider 2 to move up and down.

[0028] The mold adjustment device 6 includes a plunger cylinder 601, a fixing seat 13, an adjusting nut 602 and a nut lifting and lowering driving mechanism. The cylinder body of the plunger cylinder 601 is installed on the top of the upper beam 9 through the fixing seat 13, and its plunger 6011 is arranged above the column 4 and can be fixed together with the top of the column 4 or not.

[0029] The adjusting nut 602 is sleeved outside the column 4 and is threadedly connected to the upper part of the column 4, and supports and limits the upper crossbeam 9.

[0030] The nut lifting drive mechanism is installed on the upper crossbeam 9 to drive the four adjusting nuts 602 on the four columns 4 to rise or fall simultaneously.

[0031] The nut lifting drive mechanism is a relatively common mechanism. The nut lifting drive mechanism 61 used in this embodiment is shown in FIG. Figure 1-3 , which includes a second motor 6101 and an intermediate transmission mechanism 6102. The second motor 6101 drives each adjusting nut 602 through the intermediate transmission mechanism 6102, so that the four adjusting nuts 602 can be driven simultaneously.

[0032] The output shaft of the second motor 6101 is connected to a driving gear, and the intermediate transmission mechanism 6102 is also gear-driven. A large bevel gear 6103 is installed on the upper part of the adjusting nut 602, and the large bevel gear 6103 is meshed with a small bevel gear 6104. In this way, the second motor 6101 drives the driving gear, and drives the small bevel gear 6104 to rotate through the gear transmission of the intermediate transmission mechanism 6102, thereby driving the large gear 6103 to rotate, and the large gear 6103 carries the adjusting nut 602 up or down along the column 4.

[0033] The intermediate transmission mechanism 6102 can also be a sprocket drive. The active sprocket is connected to the output shaft of the second motor 6101, and corresponding sprockets are set on each adjusting nut 602. The sprocket on the motor, the sprocket of the intermediate transmission mechanism and the sprocket of the adjusting nut 602 are connected by a chain to drive the adjusting nut 602 to rotate.

[0034] The mold adjustment device 6 also includes a plane bearing 14, which is installed between the large bevel gear 6103 and the fixed seat 13 and is limited by the fixed seat 13. Since there is rolling friction between the adjusting nut 602 and the plane bearing 14, the adjusting nut 602 can be easily rotated without too much rotation resistance.

[0035] The mold adjustment device 6 also includes a cushion block 15, which is sleeved on the column 4 and placed in the groove 18 of the upper beam 9 below the adjusting nut 602. The cushion block 15 can control the installation gap between the adjusting nut 602 and the upper beam 9 by changing its thickness together with the plane bearing 14, so that it can compensate for the errors caused during processing and installation.

[0036] In order to better ensure the operation of the press, a compressive force sensor (not shown in the figure) is also arranged inside or below the cushion block 15. The compressive force sensor is installed in the upper cross beam 9 and is inserted into the outside of the column. Since the compressive force sensor is installed below the adjusting nut 602, the two are always in contact during stamping, so the compressive force sensor can reflect the stamping force of the press in real time. When the stamping force exceeds the set value, the signal will be fed back to the press in time to stop the press, thereby playing an overload protection role.

[0037] The mold adjusting device 6 further includes an upper bearing 16 and a lower bearing 17, which are respectively mounted on the upper and lower parts of the adjusting nut 602 and are respectively supported laterally by the fixing seat 13 and supported by the upper crossbeam 9. Figure 1 and Figure 3 This can prevent the adjusting nut 602 from moving radially due to uneven force, thereby affecting the life of the adjusting nut 602.

[0038] The press drive mechanism 10 is connected to the main shaft 5 and drives the main shaft 5 to rotate.

[0039] This embodiment is provided with a special mold adjusting device 6, which is arranged on the upper cross beam 9; the upper part of the column can also be fixed on the upper cross beam 9, and other mold adjusting devices can be used.

[0040] The specific adjustment process of the press die height is as follows: when the die height needs to be adjusted, the oil inlet chamber 6012 of the plunger cylinder 601 is depressurized to the set value, which is sufficient to bear most of the dead weight of the upper beam 9 and the components installed thereon, so that the interaction force between the adjusting nut 602 and the upper beam 9 is very small, and then the nut lifting drive mechanism drives the adjusting nut 602 to rise or fall, driving the upper beam 9, the outer slide block 3 and the slide block 2 to rise or fall synchronously with the adjusting nut 602. After reaching the set position, the nut lifting drive mechanism stops working, the adjusting nut 602 is fixed, the oil inlet chamber 6012 of the plunger cylinder 601 is pressurized, and the upper beam 9 is close to the lower surface of the adjusting nut 602. After the die height adjustment is completed, the oil inlet chamber 6012 of the plunger cylinder 601 is pressurized to the set value, and the press can be ready to start stamping.

[0041] During one working cycle of the double-stroke drawing press, the press drive mechanism 10 drives the main shaft 5 so that the cam force mechanism 7 drives the slider 2 to move downward from the top dead center position, and at the same time, the range-extending mechanism cooperates with the cam force mechanism to also drive the slider 2 downward, so that the slider 2 can quickly approach the lower die. When the workpiece starts to be stretched, the range-extending mechanism can stop, or it can continue to drive the slider 2 downward for a certain distance together with the cam force mechanism and then stop. During the workpiece stretching process, the stop and start time of the range-extending mechanism can be set according to the actual processing technology needs, and the cam force mechanism continues to drive the slider 2 downward until the workpiece stretching is completed; after the stretching is completed, the cam force mechanism drives the slider 2 to move upward, and at the same time, the range-extending mechanism also drives the slider 2 upward, so that the slider 2 can quickly move away from the lower die. After the outer slider 3 and the slider 2 are both stopped, prepare for the next stretching action.

[0042] When the slider 2 moves downward, since the downward distance of the slider 2 is the sum of the distances driven by the cam force mechanism and the distances driven by the range-extending mechanism through the outer slider 3, the downward speed of the slider 2 is accelerated, and the production efficiency can be improved. Similarly, since the upward distance of the slider 2 is the sum of the distances driven by the cam force mechanism and the distances driven by the range-extending mechanism through the outer slider 3, the upward speed is accelerated. At the same time, although the stroke of the cam has not changed, the distance driven by the slider to move the upper mold has increased, so it is equivalent to changing the stroke of the cam, which is convenient for the lower mold ejection mechanism to eject the workpiece, and also convenient for the automatic feeding component to clamp the workpiece and move the workstation.

[0043] The press drive mechanism 10 drives the main shaft 5 to rotate, so that the cam force mechanism 7 drives the slider 2 to move up and down. The range-extending mechanism can also drive the slider 2 to move up and down, so that the stroke of the slider 2 is the superposition of the stroke of the range-extending mechanism and the stroke of the cam mechanism, that is, the moving distance of the slider is increased, so that deep drawing can be achieved, the cam does not need to be enlarged, the driving power is small, and the production efficiency is improved.

[0044] Also, since the two driving mechanisms, the range extending mechanism and the cam force applying mechanism 7 driven by the press driving mechanism 10, are both independently controllable, the range extending mechanism can set the start and stop time according to actual needs and cooperate with the action of the cam force applying mechanism 7. As a result, the entire stroke of the stretching press is variable and controllable, making the use of the stretching press wider.

Claims

1. A double-stroke stretching press, characterized in that: It includes a range-extending mechanism, an outer slider, a main shaft, a slider, a column, a base, a cam force-applying mechanism, an upper crossbeam and a main shaft driving mechanism of a press; the range-extending mechanism is installed on the upper crossbeam and connected to the outer slider, driving the outer slider to move up and down; there are four columns, the lower ends of which are fixed to the base, and the upper ends pass through the outer slider and are fixed to the upper crossbeam; the main shaft is rotatably supported by the outer slider, on which a cam force-applying mechanism is installed, the cam force-applying mechanism is connected to the slider and drives the slider to move up and down; the press driving mechanism is connected to the main shaft and drives the main shaft to rotate; when the press is working, the pressure The machine driving mechanism drives the main shaft to drive the slider to move downward from the top dead center position through the cam force mechanism. At the same time, the range-extending mechanism drives the outer slider to move downward, and drives the slider downward together with the cam force mechanism. When the workpiece starts to be stretched, the range-extending mechanism stops or continues to drive the slider downward for a certain distance together with the cam force mechanism and then stops. The cam force mechanism continues to drive the slider downward until the workpiece stretching is completed; after the stretching is completed, the cam force mechanism drives the slider to move upward, and at the same time, the range-extending mechanism drives the slider upward by moving the outer slider upward until the outer slider and the slider stop moving.

2. The double-stroke drawing press according to claim 1, characterized in that: The range-extending mechanism includes a first motor, a gear transmission mechanism and a connecting rod. The first motor is mounted on an upper crossbeam. The upper end of the connecting rod is mounted on an eccentric shaft, and the lower end thereof is connected to an outer slider. The first motor drives the gear transmission mechanism to rotate the eccentric shaft, thereby causing the connecting rod to drive the outer slider to move up and down.

3. The double-stroke drawing press according to claim 1 or 2, characterized in that: A mold adjusting device is also provided, which includes a plunger cylinder, a fixing seat, an adjusting nut and a nut lifting drive mechanism, wherein the cylinder body of the plunger cylinder is installed on the top of the upper crossbeam through the fixing seat, and the plunger is arranged above the column; the upper end of the column passes through the upper crossbeam; the adjusting nut is inserted into the outside of the column and is threadedly connected to the upper part of the column, and supports and limits the upper crossbeam; the nut lifting drive mechanism is installed on the upper crossbeam, and drives the four adjusting nuts on the four columns to rise or fall at the same time.

4. The double-stroke drawing press according to claim 3, characterized in that: The nut lifting drive mechanism comprises a second motor and an intermediate transmission mechanism. The second motor drives each adjusting nut simultaneously through the transmission of the intermediate transmission mechanism.

5. The double-stroke drawing press according to claim 4, characterized in that: The output shaft of the second motor is connected to a driving gear, the intermediate transmission mechanism is a gear transmission, a large bevel gear is installed on the upper part of the adjusting nut, and the large bevel gear is meshed with a small bevel gear. In this way, the second motor drives the driving gear, which drives the small bevel gear to rotate through the gear transmission of the intermediate transmission mechanism, thereby driving the large bevel gear to rotate, and the large bevel gear carries the adjusting nut up or down along the column.

6. The double-stroke drawing press according to claim 5, characterized in that: A plane bearing is arranged between the large bevel gear and the fixed seat, and is limited by the fixed seat, so that the adjusting nut is subjected to rolling friction when rotating through the plane bearing.

7. The double-stroke drawing press according to claim 3, characterized in that: The mold adjusting device also includes a cushion block, which is sleeved on the column and placed in a groove of the upper crossbeam below the adjusting nut.

8. The double-stroke drawing press according to claim 7, characterized in that: A compressive force sensor is also arranged inside or below the cushion block. The compressive force sensor is installed inside the upper cross beam and is sleeved outside the column.

9. The double-stroke drawing press according to claim 3, characterized in that: The mold adjusting device also includes an upper bearing and a lower bearing, which are respectively mounted on the upper part and the lower part of the adjusting nut and are respectively supported laterally by the fixing seat and the upper crossbeam.

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