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 utility model, the stroke extending mechanism is additionally arranged, so that the existing stretching press can be additionally provided with another stroke provided by the stroke extending mechanism besides the sliding block stroke realized by the existing cam force application mechanism, and the stretching stroke of the stretching press can be increased without increasing the cam, namely, deep stretching is realized without increasing the driving power; in addition, the production efficiency can be improved through the range extending mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to a press, especially a double-stroke stretch press. BACKGROUND

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

[0003] The existing cam stretcher has a proportional relationship between the stroke of the cam and the driving power after the stretching force is determined, which means that it can only meet the part processing of a certain height range, and if it exceeds this range, the stroke of the cam needs to be increased, and a larger power motor and a reduction box need to be configured to match the increasing driving torque of the press, which will increase the cost of the equipment and also reduce the production efficiency of the press, so the stretch press without a large-stroke cam cannot meet the deep-drawing requirements, and therefore, the use range of the existing stretch press is also limited. SUMMARY

[0004] The utility model solves the technical problem of overcoming the above-mentioned defects of the prior art and provides a double-stroke stretch press, which can increase the stroke of the press through the double-stroke mechanism to realize deep drawing and make the press have a wider application range.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0006] A double-stroke stretch press, comprising a stroke-increasing mechanism, an outer slide block, a main shaft, a slide block, a stand, a base, a cam force application mechanism, an upper cross beam, and a press main shaft driving mechanism;

[0007] The stroke-increasing mechanism is installed on the upper cross beam and connected with the outer slide block to drive the outer slide block to move up and down;

[0008] The stand has four rods, the lower end of the stand is fixed on the base, and the upper end penetrates through the outer slide block and is fixed on the upper cross beam;

[0009] The main shaft is rotatably supported by the outer slide block, and the cam force application mechanism is installed on the main shaft, the cam force application mechanism is connected with the slide block and drives the slide block to move up and down;

[0010] The press driving mechanism is connected with the main shaft and drives the main shaft to rotate;

[0011] When the press is working, the driving mechanism of the press drives the main shaft to move the slider downward from the upper dead point position through the cam force mechanism, at the same time, the range increasing mechanism drives the outer slider to move downward, and together with the cam force mechanism, drives the slider to move downward, when the workpiece is started to be stretched, the range increasing mechanism stops or continues to drive the slider to move downward together with the cam force mechanism for a distance, then stops, the cam force mechanism continuously drives the slider to move downward until the workpiece stretching is completed; after the stretching is completed, the cam force mechanism drives the slider to move upward, at the same time, the range increasing mechanism drives the slider to move upward by moving the outer slider upward, until the outer slider and the slider stop moving.

[0012] More specifically, the range increasing mechanism comprises a first motor, a gear transmission mechanism and a connecting rod, the first motor is installed on the upper cross beam, the upper end of the connecting rod is installed on the eccentric shaft, and the lower end is connected with the outer slider, the first motor drives the gear transmission mechanism to rotate the eccentric shaft, so that the connecting rod drives the outer slider to move up and down.

[0013] Better still, a die adjusting device is provided, which comprises a plunger cylinder, a fixed seat, an adjusting nut and a nut lifting driving mechanism, the cylinder body of the plunger cylinder is installed on the top of the upper cross beam through the fixed seat, and the plunger is arranged above the column; the upper end of the column penetrates through the upper cross beam; the adjusting nut is sleeved on the outside of the column and is threadedly connected with the upper part of the column, and supports and limits the upper cross beam; the nut lifting driving mechanism is installed on the upper cross beam to drive four adjusting nuts on the four columns to simultaneously rise or fall.

[0014] More specifically, the nut lifting driving mechanism comprises a second motor and an intermediate transmission mechanism, the second motor drives each adjusting nut through the intermediate transmission mechanism, so that the four adjusting nuts can be driven simultaneously.

[0015] 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 engaged with a small bevel gear, so that the second motor drives the driving gear, the gear transmission of the intermediate transmission mechanism drives the small bevel gear to rotate, thereby driving the large bevel gear to rotate, and the large bevel gear drives the adjusting nut to rise or fall along the column.

[0016] Better still, a plain bearing is arranged between the large bevel gear and the fixed seat, and is limited by the fixed seat, so that when the adjusting nut rotates, it becomes rolling friction through the plain bearing, thereby reducing the friction when the adjusting nut rotates, and the adjusting nut can be rotated more easily.

[0017] Better still, the die adjusting device further comprises a pad, which is sleeved on the column and placed in the groove of the upper cross beam below the adjusting nut.

[0018] Even better, a compressive force sensor is also provided inside or below the pad block. The compressive force sensor is installed inside the upper crossbeam and sleeved on the outside of the column.

[0019] Even better, the adjusting device further includes an upper bearing and a lower bearing, which are respectively installed on the upper and lower parts of the adjusting nut and are supported laterally by a fixed seat and by an upper crossbeam, thereby preventing the adjusting nut from moving radially due to uneven force and thus affecting the life of the adjusting nut.

[0020] Compared with the prior art, the advantages of this utility model are as follows: by adding a stroke-extending mechanism, and enabling the outer slider to move up and down through the stroke-extending mechanism, the existing stretching press can add another stroke provided by the stroke-extending mechanism in addition to the slider stroke achieved by the existing cam force application mechanism. Thus, the stretching stroke of the stretching press can be increased without increasing the cam, that is, deep stretching can be achieved without increasing the drive power. Moreover, the production efficiency can be improved through the stroke-extending mechanism.

[0021] Furthermore, the motion processes of the extension mechanism and the cam force application mechanism can be coordinated by control, making the entire stroke of the stretching press variable and controllable, thus expanding its application range. Attached Figure Description

[0022] Figure 1 This is a front structural diagram of a double-stroke tensile press according to an embodiment of the present invention.

[0023] Figure 2 This is a top view of a double-stroke tensile press according to an embodiment of the present invention.

[0024] Figure 3 This is a cross-sectional view of a mold adjustment device for a double-stroke stretching press according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the extended range mechanism of a dual-stroke stretching press according to an embodiment of the present invention.

[0026] Figure 5 This is a structural schematic diagram of the connection method of a range extender mechanism for a dual-stroke tensile press according to an embodiment of the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 , Figure 2 As shown, a double-stroke stretching press includes a stroke-extending mechanism 8, a mold-adjusting device 6, an outer slider 3, a main shaft 5, a slider 2, a column 4, a base 1, a cam force-applying mechanism 7, an upper crossbeam 9, and a press main shaft drive mechanism 10.

[0029] As Figure 1 , 4 , the range extending mechanism 8 is installed on the upper cross beam 9 and connected with the outer slider 3 to drive the outer slider 3 and the components installed thereon to move up and down.

[0030] 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 cross beam 9, the connecting rod 803 is installed on the eccentric shaft 804 at the upper end and connected with the outer slider 3 at the lower end through the 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.

[0031] The range extending mechanism can also be replaced by other up-down driving mechanisms to drive the outer slider 3 to move up and down.

[0032] The four upright columns 4 are fixed at the lower end on the base 1 and pass through the outer slider 3 and the upper cross beam 9 at the upper end.

[0033] The main shaft 5 is rotatably supported by the outer slider 3, the cam force applying mechanism 7 is installed on the main shaft 5, the cam force applying mechanism 7 is connected with the slider 2 and drives the slider 2 to move up and down.

[0034] The mold adjusting device 6 includes a plunger cylinder 601, a fixed seat 13, an adjusting nut 602 and a nut lifting driving mechanism, the cylinder body of the plunger cylinder 601 is installed on the top of the upper cross beam 9 through the fixed seat 13, the plunger 6011 of the plunger cylinder 601 is arranged above the upright column 4 and can be fixed together with the top of the upright column 4 or not.

[0035] The adjusting nut 602 is sleeved on the outside of the upright column 4 and threadedly connected with the upper part of the upright column 4 and supports and limits the upper cross beam 9.

[0036] The nut lifting driving mechanism is installed on the upper cross beam 9 and drives the four adjusting nuts 602 on the four upright columns 4 to simultaneously ascend or descend.

[0037] The nut lifting driving mechanism is a relatively common mechanism, the nut lifting driving mechanism 61 adopted in the embodiment is shown in Figures 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 simultaneously driven.

[0038] The second motor 6101 is connected with a driving gear on the output shaft, the intermediate transmission mechanism 6102 is also a gear transmission, a large bevel gear 6103 is installed on the upper part of the adjusting nut 602, and the large bevel gear 6103 is engaged with a small bevel gear 6104, so that the second motor 6101 drives the driving gear, drives the small bevel gear 6104 to rotate through the gear transmission of the intermediate transmission mechanism 6102, and drives the large gear 6103 to rotate, and the large gear 6103 drives the adjusting nut 602 to ascend or descend along the column 4.

[0039] The intermediate transmission mechanism 6102 can also be a chain wheel transmission, a driving chain wheel is connected with the output shaft of the second motor 6101, and a corresponding chain wheel is arranged on each adjusting nut 602, so that the adjusting nut 602 is driven to rotate through the chain connection of the chain wheel on the motor, the chain wheel of the intermediate transmission mechanism and the chain wheel of the adjusting nut 602.

[0040] The die adjusting device 6 further comprises 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, and since the rolling friction is formed between the adjusting nut 602 and the plane bearing 14, the adjusting nut 602 can be conveniently rotated without too much rotating resistance.

[0041] The die adjusting device 6 further comprises a pad 15, which is sleeved on the column 4 and placed in the groove 18 of the upper cross beam 9 below the adjusting nut 602, and the pad 15 can control the installation gap between the adjusting nut 602 and the upper cross beam 9 together with the plane bearing 14 by changing the thickness, so that the error caused by machining and installation can be compensated.

[0042] In order to better ensure the operation of the press, a pressing force sensor (not shown in the figure) is further arranged in or below the pad 15, the pressing force sensor is installed in the upper cross beam 9 and is sleeved outside the column, since the pressing force sensor is installed below the adjusting nut 602 and the two are always in contact during stamping, the pressing force sensor can reflect the stamping force of the press in real time, when the stamping force exceeds the set value, a feedback signal is sent to the press in time, so that the press is stopped, and the overload protection effect is achieved.

[0043] The die adjusting device 6 further comprises an upper bearing 16 and a lower bearing 17, which are respectively installed on the upper part and the lower part of the adjusting nut 602 and are respectively supported by the fixed seat 13 and the upper cross beam 9, as shown in Figure 1 and Figure 3 , so that the radial movement of the adjusting nut 602 caused by uneven force can be prevented, and the service life of the adjusting nut 602 is affected.

[0044] The press driving mechanism 10 is connected with the main shaft 5 and drives the main shaft 5 to rotate.

[0045] The embodiment sets a special die adjusting device 6, which is arranged on the upper beam 9. The upper part of the column can also be fixed on the upper beam 9, and other die adjusting devices can be used.

[0046] The specific adjustment process of the press die height is as follows: when the die height needs to be adjusted, the oil inlet cavity 6012 of the plunger cylinder 601 is depressurized to a set value, which is sufficient to bear most of the self-weight of the upper beam 9 and the components mounted thereon, so that the interaction force between the adjusting nut 602 and the upper beam 9 is small, then the nut lifting driving mechanism drives the adjusting nut 602 to rise or fall, driving the upper beam 9, the outer slider 3 and the slider 2 to rise or fall synchronously with the adjusting nut 602, and when reaching the set position, the nut lifting driving mechanism stops working, and the adjusting nut 602 is fixed, the oil inlet cavity 6012 of the plunger cylinder 601 is pressurized, and the upper beam 9 is pressed against the lower surface of the adjusting nut 602, and the die height adjustment is completed. The oil inlet cavity 6012 of the plunger cylinder 601 is pressurized to the set value, and the press can be prepared to start stamping.

[0047] In a working cycle of the double-stroke stretch press, the press driving mechanism 10 drives the main shaft 5 to make the cam force mechanism 7 drive the slider 2 to move downward from the upper dead point position, and at the same time, the stroke increasing 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 and start stretching the workpiece. The stroke increasing mechanism can stop or continue to drive the slider 2 downward together with the cam force mechanism for a certain distance and then stop. During the stretching of the workpiece, the start and stop time of the stroke increasing mechanism can be set according to the actual processing process, while the cam force mechanism continuously drives the slider 2 to move downward until the stretching of the workpiece is completed. After the stretching is completed, the cam force mechanism drives the slider 2 to move upward, and at the same time, the stroke increasing mechanism also drives the slider 2 to move upward, so that the slider 2 can quickly move away from the lower die. After the outer slider 3 and the slider 2 stop, the next stretching action is prepared.

[0048] When the slider 2 moves downward, the downward distance of the slider 2 is the sum of the distance moved by the slider driven by the cam force mechanism and the distance moved by the slider driven by the stroke increasing mechanism through the outer slider 3, so the downward speed of the slider 2 is accelerated, and the production efficiency can be improved. Similarly, when the slider 2 moves upward, the upward distance of the slider 2 is the sum of the distance moved by the slider driven by the cam force mechanism and the distance moved by the slider 2 driven by the stroke increasing mechanism through the outer slider 3, so the upward speed is accelerated. Although the stroke of the cam does not change, the distance moved by the slider to drive the upper die is increased, so the stroke of the cam is equivalent to being changed, which is convenient for the ejection of the workpiece by the lower die ejection mechanism and the need for the automatic feeding component to clamp the workpiece to move the work station.

[0049] The press driving mechanism 10 drives the main shaft 5 to rotate, so that the cam force applying mechanism 7 drives the slider 2 to move up and down, and the range increasing 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 increasing mechanism and the stroke of the cam mechanism, that is, the moving distance of the slider is increased, so that deep drawing can be realized, the cam does not need to be enlarged, the driving power is small, and the production efficiency is also improved.

[0050] In addition, since the range increasing mechanism and the cam force applying mechanism 7 driven by the press driving mechanism 10 are both independently controllable, the range increasing mechanism can set the starting and stopping time according to actual needs, and cooperate with the action of the cam force applying mechanism 7, so that the whole stroke of the drawing press is variable and controllable, and the use range of the drawing press is wider.

Claims

1. A double stroke drawing press characterized by: The press machine comprises a range increasing mechanism, an outer slide block, a main shaft, a slide block, a column, a base, a cam force applying mechanism, an upper beam and a press machine main shaft driving mechanism; the range increasing mechanism is installed on the upper beam and connected with the outer slide block to drive the outer slide block to move up and down; the column is four in number, the lower end of the column is fixed on the base, the upper end penetrates through the outer slide block and is fixed on the upper beam; the main shaft is rotatably supported by the outer slide block, the cam force applying mechanism is installed on the main shaft, the cam force applying mechanism is connected with the slide block and drives the slide block to move up and down; the press machine driving mechanism is connected with the main shaft and drives the main shaft to rotate; when the press machine works, the press machine driving mechanism drives the main shaft to drive the slide block to move downward from the upper dead point position through the cam force applying mechanism, at the same time, the range increasing mechanism drives the outer slide block to move downward and drives the slide block to move downward together with the cam force applying mechanism, when the workpiece starts to be stretched, the range increasing mechanism stops or continues to drive the slide block to move downward together with the cam force applying mechanism for a distance and then stops, the cam force applying mechanism continuously drives the slide block to move downward until the workpiece stretching is completed; after the stretching is completed, the cam force applying mechanism drives the slide block to move upward, at the same time, the range increasing mechanism drives the slide block to move upward by moving the outer slide block upward, until the outer slide block and the slide block stop moving.

2. The dual stroke stretch press of claim 1 wherein: The range increasing mechanism comprises a first motor, a gear transmission mechanism and a connecting rod, the first motor is installed on the upper beam, the upper end of the connecting rod is installed on an eccentric shaft, the lower end of the connecting rod is connected with the outer slide block, the first motor drives the gear transmission mechanism to rotate the eccentric shaft, so that the connecting rod drives the outer slide block to move up and down.

3. Double stroke drawing press according to claim 1 or 2, characterized in that: A die adjusting device is further arranged, the die adjusting device comprises a plunger cylinder, a fixed seat, an adjusting nut and a nut lifting driving mechanism, the cylinder body of the plunger cylinder is installed on the top of the upper beam through the fixed seat, the plunger of the plunger cylinder is arranged above the column; the upper end of the column penetrates through the upper beam; the adjusting nut is sleeved on the outside of the column and is threadedly connected with the upper part of the column, and supports and limits the upper beam; the nut lifting driving mechanism is installed on the upper beam to simultaneously drive the four adjusting nuts on the four columns to move upward or downward.

4. The dual stroke stretch press of claim 3 wherein: The nut lifting driving mechanism comprises a second motor and an intermediate transmission mechanism, the second motor drives each adjusting nut through the intermediate transmission mechanism.

5. The dual stroke stretch press of claim 4 wherein: A driving gear is connected on 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, the large bevel gear is engaged with a small bevel gear, so that the second motor drives the driving gear, the gear transmission of the intermediate transmission mechanism drives the small bevel gear to rotate, so as to drive the large bevel gear to rotate, and the large bevel gear drives the adjusting nut to move upward or downward along the column.

6. The dual stroke stretch press of claim 5 wherein: A plain bearing is arranged between the large bevel gear and the fixed seat and is limited by the fixed seat, so that the adjusting nut rotates as rolling friction through the plain bearing.

7. The dual stroke drawing press of claim 3 wherein: The die adjusting device further comprises a pad block, the pad block is sleeved on the column and arranged in the groove of the upper beam below the adjusting nut.

8. The dual stroke stretch press of claim 7 wherein: A pressure sensor is further arranged in or below the pad block, the pressure sensor is installed in the upper beam and sleeved on the outside of the column.

9. The dual stroke drawing press of claim 3 wherein: The die adjusting device further comprises an upper bearing and a lower bearing, which are respectively installed on the upper part and the lower part of the adjusting nut and are respectively supported by the fixed seat and the upper beam.

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