CN117087225A - Double-acting punch press and use method thereof - Google Patents

Abstract

The invention relates to a double-acting punch press and a use method thereof. The driving assembly is arranged on the machine base, the transmission assembly is respectively connected with the driving assembly, the outer sliding block and the inner sliding block, the upper die is connected with the outer sliding block, and the lower die is arranged on the machine base. The transmission assembly comprises a crankshaft, a first connecting rod and a second connecting rod, wherein the first connecting rod and the second connecting rod are connected with the crankshaft through a first connecting rod journal and a second connecting rod journal respectively, the journal center lines of the connecting rod journals are parallel, and the first connecting rods are symmetrically arranged on two sides of the second connecting rod in pairs. The transmission assembly further comprises a toggle type connecting rod group, and particularly comprises a first toggle rod and a second toggle rod which are connected through a second pin shaft, the first connecting rod is connected with the first toggle rod through a third pin shaft, the second toggle rod is connected with the outer sliding block through the first pin shaft, and the inner sliding block is connected with the second connecting rod. The inner slide block and the outer slide block can be driven to respectively complete one-time stamping action by one rotation of the driving assembly, so that the production process is simplified, and the energy consumption is reduced.

Description

Double-acting punch press and use method thereof

Technical Field

The invention belongs to the technical field of presses, and particularly relates to a double-acting punch press and a use method thereof.

Background

The punching machine, also called punching press, is widely used in various fields, and can process blanking, punching, forming, deep drawing, trimming, fine punching, shaping, riveting, extrusion and the like. The operation principle of the punching machine is that circular motion is converted into linear motion, specifically, power is output by a motor to drive a flywheel, and a gear, a crankshaft, a connecting rod and the like are driven to operate through a clutch so as to be converted into linear motion of a sliding block.

The punching machine can be matched with a corresponding automatic feeding device to realize automatic production. Compared with the traditional mechanical processing, the punching process can save raw materials and energy sources and has low technical requirements for operators.

Most of the punching machines in the prior art are single-action punching machines, and in the workpiece processing process, different processes are required to be designed according to processing requirements, and each station is used for completing one process. However, for workpieces with complex shapes, such as a cross shaft, a Y-shaped tee joint, an automobile ball cage, an automobile hub and the like, the existing single-action punch press needs to move the position of the die for multiple times, or the workpiece can be machined by adopting two punch presses, so that the operation is complex, the machining time of the workpiece is prolonged, and the machining efficiency is reduced.

In order to accelerate the manufacturing efficiency, the forming of the workpiece with the complex shape can be realized through an injection molding process, but compared with the stamping forming, the workpiece prepared through the injection molding process has insufficient strength and is easy to damage.

Therefore, it is necessary to provide a punch press capable of rapidly manufacturing a complex-shaped workpiece while securing strength.

Disclosure of Invention

First, the technical problem to be solved

The invention provides a double-acting punch and a use method thereof, aiming at solving the problems of complex operation and long processing time when a single-acting punch is used for processing a workpiece with a complex shape in the prior art.

(II) technical scheme

In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:

a double-acting punch press comprises a base, a driving assembly, a transmission assembly, an upper die, a lower die, an outer sliding block and an inner sliding block;

the driving assembly is arranged on the base, and the transmission assembly is respectively connected with the driving assembly, the outer sliding block and the inner sliding block; the upper die is connected with the outer sliding block, the lower die is arranged on the base, and the inner sliding block is positioned at the inner side of the outer sliding block;

the transmission assembly comprises a crankshaft, a first connecting rod and a second connecting rod, wherein the first connecting rod and the second connecting rod are connected with the crankshaft through a first connecting rod journal and a second connecting rod journal respectively, the journal central lines of the first connecting rod journal and the second connecting rod journal are parallel, and the first connecting rods are symmetrically arranged on two sides of the second connecting rod in pairs; the transmission assembly further comprises a toggle type connecting rod group, the toggle type connecting rod group comprises a first toggle rod and a second toggle rod which are connected through a second pin shaft, the first connecting rod is connected with the first toggle rod through a third pin shaft, and the second toggle rod is connected with the outer sliding block through a first pin shaft; the inner slide block is rotationally connected with the second connecting rod.

The double-acting punch press as described above, preferably, the toggle link set further includes a third toggle link connected to the first toggle link, and the third toggle link is connected to the first toggle link through a third pin;

the other end of the third toggle rod is further provided with an auxiliary adjusting block, and the auxiliary adjusting block is connected with the third toggle rod through a fourth pin shaft.

The double-acting punch press as described above, preferably, the driving assembly includes a driving motor, a first belt pulley, a second belt pulley, a belt, a transmission shaft, a gear, a flywheel, a clutch, and a brake;

the output shaft of the driving motor is connected with the first belt pulley, and the first belt pulley is in transmission connection with the second belt pulley through the belt;

the second belt pulley and the gear are respectively arranged on the transmission shaft, the flywheel and the clutch are arranged at one end of the crankshaft, the brake is arranged at the other end of the crankshaft, and the flywheel is meshed with the gear.

The double-acting punch press preferably further comprises a material ejection assembly, wherein the material ejection assembly is used for ejecting the punched and formed workpiece out of the lower die; the ejection assembly comprises a driving piece, an eccentric shaft and an ejection core;

the eccentric shaft comprises an eccentric shaft body, a left rotating shaft and a right rotating shaft which are respectively arranged at two ends of the eccentric shaft body, the left rotating shaft and the axis of the right rotating shaft are on the same straight line, and the axis of the eccentric shaft body is parallel to but not coincident with the axis of the left rotating shaft;

one of the left rotating shaft or the right rotating shaft is connected with the driving piece, and the eccentric shaft body is positioned below the ejector core and is in contact with the ejector core;

the ejection core penetrates through the lower die.

The double-acting punch press as described above, preferably, the driving member is an oil cylinder or a motor.

The double-acting punch press preferably further comprises an adjusting assembly, wherein the adjusting assembly is used for adjusting the distance between the upper die and the lower die;

the lower die comprises a fixed platen and a movable platen from bottom to top, and the fixed platen is fixedly arranged on the base;

the adjusting assembly comprises a wedge block and a pushing structure, the wedge block is positioned between the fixed platen and the movable platen, and the wedge block is matched with the movable platen through an inclined plane;

the pushing structure is used for pushing the wedge-shaped block to move relative to the fixed platen and the movable platen so as to adjust the height of the movable platen relative to the upper die.

Preferably, the pushing structure comprises a motor and a screw rod, the motor is connected with the screw rod through a second gear transmission, and the screw rod is connected with the wedge block.

Preferably, the end of the movable platen and the fixed platen, which is far away from the adjusting component, is further provided with a baffle, the baffle is fixedly connected with the fixed platen, and the baffle is in contact with the movable platen.

Preferably, the top of the machine base is provided with an air storage tank, the air storage tank is respectively connected with the clutch and the brake, and the air storage tank is provided with an air inlet, a clutch connection port, a brake connection port and a safety valve.

The invention also provides a use method of the double-acting punch press, which comprises the following steps:

s1: placing a material to be processed into a lower die, starting a punching machine, and transmitting power to a first connecting rod and a second connecting rod by a driving assembly through a crankshaft;

s2: the first connecting rod and the toggle type connecting rod group drive the outer sliding block and the upper die to descend, the material to be processed is punched once, and then the upper die and the lower die are subjected to pressure maintaining;

s3: in the process of maintaining pressure on the upper die and the lower die by the first connecting rod and the toggle type connecting rod group, the second connecting rod drives the inner slide to descend, and the material to be processed is punched once;

s4: after the inner slide block is punched once, the second connecting rod drives the inner slide block to ascend;

s5: the first connecting rod and the toggle type connecting rod group drive the outer sliding block and the upper die to ascend, so that stamping of one workpiece is completed;

s6: and repeating the steps S1-S5 to finish the stamping processing of a plurality of workpieces.

(III) beneficial effects

The beneficial effects of the invention are as follows:

the invention simultaneously sets an outer slide block and an inner slide block on the same punch press, connects the outer slide block through a first connecting rod and a toggle type connecting rod group, connects the inner slide block through a second connecting rod, drives the inner slide block and the outer slide block to act through a crankshaft, and the outer slide block and the inner slide block are asynchronous in movement and different in time for reaching a bottom dead center. According to the invention, the driving assembly can drive the outer slide block and the inner slide block to do reciprocating motion once every time when driving the crankshaft to rotate, and the material to be processed is punched once respectively, so that a plurality of punching machines are not needed, the position of a workpiece is not needed to be changed for a plurality of times, the production process is simplified, the production time of the workpiece is greatly reduced, and the energy consumption is reduced.

Drawings

FIG. 1 is a front view of a double-acting punch press of the present invention;

FIG. 2 is a left side view of the double-acting punch press of the present invention;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4 is a top view of a double-acting punch;

FIG. 5 is a partial top view of a double-acting punch;

FIG. 6 is a left side view (partial) of FIG. 2;

FIG. 7 is a partial schematic view of FIG. 2;

FIG. 8 is a partial cross-sectional view of a double-acting punch;

FIG. 9 is a partial schematic view of FIG. 3;

FIG. 10 is a partial schematic view of FIG. 4;

fig. 11 is a trajectory diagram of each node.

[ reference numerals description ]

1: a base; 2: an upper die; 3: a lower die; 4: an outer slider; 5: an inner slide; 6: a crankshaft; 7: a first link; 8: a second link; 9: a first pin; 10: a second pin; 11: a third pin; 12: a fourth pin; 13: a first toggle lever; 14: a second toggle lever; 15: a third toggle lever; 16: an auxiliary adjusting block;

17: a driving motor; 18: a first pulley; 19: a second pulley; 20: a belt; 21: a transmission shaft; 22: a gear; 23: a flywheel; 24: a clutch; 25: a brake;

26: a driving member; 27: an eccentric shaft; 28: jacking a material core; 29: a fixed platen; 30: a moving platen; 31: wedge blocks; 32: an inclined plane;

33: a motor; 34: a screw rod; 35: a baffle; 36: a gas storage tank; 361: an air inlet; 362: a clutch connection port; 363: a brake connection port; 364: a safety valve; 37: the space between the inner slide block and the outer slide block; 38: a fixing bolt; 39: a first link cover; 40: a second link cover;

41: a fifth pin; 42: a support rod; 43: a rear copper rail; 44: a side copper rail; 45:

a front rail plate; 46: side rail plate bottom plate.

Detailed Description

The invention will be better explained by the following detailed description of the embodiments with reference to the drawings.

Example 1

As shown in fig. 1-11, the present embodiment provides a double-acting punch press, which includes a machine base 1, a driving assembly, a transmission assembly, an upper die 2, a lower die 3, an outer slide 4, and an inner slide 5. The lower die 3 is used for placing materials to be processed, the driving assembly is arranged on the machine base 1, the transmission assembly is respectively connected with the driving assembly, the outer sliding block 4 and the inner sliding block 5, and the driving assembly respectively transmits power to the inner sliding block and the outer sliding block through the transmission assembly, so that the stamping forming of a workpiece is realized. The upper die 2 is connected with the outer slide block 4, the lower die 3 is arranged on the machine base 1, and the inner slide block 5 is positioned on the inner side of the outer slide block 4. The transmission assembly comprises a crankshaft 6, a first connecting rod 7 and a second connecting rod 8 which are respectively connected with the crankshaft 6 through a first connecting rod journal and a second connecting rod journal, wherein the journal center lines of the first connecting rod journal and the second connecting rod journal are parallel but not coincident, so that the time for the inner sliding block and the outer sliding block to reach the bottom dead center is different. The first connecting rods 7 include 2 connecting rods, and are oriented horizontally in the direction in which the crankshaft is located, and fig. 3 is a cross-sectional view of fig. 1 taken along the vertical plane in which the horizontal direction is located. As shown in fig. 3 and 9, the pair of first links 7 are symmetrically disposed on both sides of the second link 8. In addition, as shown in fig. 2, the transmission assembly further comprises a toggle link set, and the toggle link set specifically comprises a first toggle link 13 and a second toggle link 14, which are connected through a second pin 10, wherein the first link 7 is connected with the first toggle link 13 through a third pin 11, and the second toggle link 14 is connected with the outer slide 4 through a first pin 9. The inner slide 5 is rotatably connected to the second link 8, specifically, the inner slide 5 is rotatably connected to the second link 8 through a fifth pin 41.

In the embodiment, the outer slide block and the inner slide block are simultaneously arranged on a punching machine, the outer slide block is connected through the first connecting rod and the toggle type connecting rod group, the inner slide block is connected through the second connecting rod, the first connecting rod and the second connecting rod are driven by a crankshaft to move, the inner slide block and the outer slide block are driven to move, the outer slide block and the inner slide block are not synchronous, the time for reaching a bottom dead center is also different, the outer slide block is driven by the first connecting rod and the toggle type connecting rod group to punch materials in the process of rotating the crankshaft for one circle, after the first punching is completed, the outer slide block does not rise, the upper die and the lower die are maintained by virtue of the structure of the first connecting rod and the toggle type connecting rod group, and then the inner slide block is driven by the second connecting rod to descend and the materials to be processed are punched for the second time. Therefore, in this embodiment, the driving assembly drives the bent axle to rotate once, just can drive outer slider and interior slider respectively and do a reciprocating motion, respectively carry out punching press once to the material of waiting to process, realized the quick processing to complicated shape work piece, compared with prior art, this embodiment need not to adopt a plurality of punches, also need not to change the work piece position many times, has simplified the technology of production, has significantly reduced the production time of work piece, has reduced the energy consumption.

In this embodiment, the movement time of the outer slide and the inner slide is different, and the space 37 between the inner slide and the outer slide, the first link cover 39 at the top of the first link, and the second link cover at the top of the second link can be seen in fig. 7. As shown in fig. 10, a rear copper rail 43, a side copper rail 44, a front rail plate 45, and a side rail plate bottom plate 46 are provided on the machine base 1, and a slider reciprocates along the rails.

In this embodiment, the whole stand 1 is fixed by a plurality of fixing bolts 38 from top to bottom.

Preferably, the toggle linkage further includes a third toggle link 15 connected to the first toggle link 13, and the third toggle link 15 is connected to the first toggle link 13 through a third pin 11. The other end of the third toggle rod 15 is also provided with an auxiliary adjusting block 16, and the auxiliary adjusting block 16 is connected with the third toggle rod 15 through a fourth pin shaft 12. The first toggle rod and the second toggle rod have plane actions of rotation and movement, the third toggle rod 15 swings around the fourth pin shaft 12, and the auxiliary adjusting block 16 is used for adjusting the punching height.

Preferably, as shown in fig. 4-5, the drive assembly includes a drive motor 17, a first pulley 18, a second pulley 19, a belt 20, a drive shaft 21, a gear 22, a flywheel 23, a clutch 24, and a brake 25. The driving motor 17 may be fixedly provided at the top of the housing 1. An output shaft of the driving motor 17 is connected with a first belt pulley 18, and the first belt pulley 18 is in transmission connection with a second belt pulley 19 through a belt 20. The second pulley 19 and the gear 22 are respectively provided on the transmission shaft 21, the flywheel 23 and the clutch 24 are provided on one end of the crankshaft 6, the brake 25 is provided on the other end of the crankshaft 6, and the flywheel 23 is engaged with the gear 22. With the above structure, power is transmitted from the driving motor to the crankshaft and then to the inside and outside sliders.

The double-acting punch press of the embodiment further comprises a material ejection assembly, and the material ejection assembly is used for ejecting the punched workpiece out of the lower die 3. As shown in fig. 2-3, the ejector assembly specifically includes a drive member 26, an eccentric shaft 27, and an ejector core 28. The driving piece 26 drives the eccentric shaft 27 to rotate, so that the ejection core 28 moves upwards relative to the lower die 3, and the workpiece on the lower die 3 is ejected.

Specifically, the eccentric shaft 27 includes an eccentric shaft body, and a left rotating shaft and a right rotating shaft respectively disposed at both ends of the eccentric shaft body, the axes of the left rotating shaft and the right rotating shaft being on the same straight line, the axes of the eccentric shaft body and the left rotating shaft being parallel but not coincident. One of the left or right rotational shafts is connected to the driving member 26, and the eccentric shaft body is located below the ejector core 28 and is in contact with the ejector core 28. The ejector pin 28 penetrates through the lower die 3. In this embodiment, the driving member 26 may be an oil cylinder or a motor.

The eccentric shaft is supported by the support rod 42, specifically, two ends of the support rod 42 are fixedly connected with the bottom of the movable platen and the base respectively, and two ends of the eccentric shaft can be mounted on the support rod 42 through a bearing or other structure.

The general rotating shaft can only rotate, the eccentric shaft is adopted in the embodiment, the eccentric shaft is provided with two parallel and non-coincident axes, besides the eccentric shaft can rotate, revolution can be transmitted to the ejection core through contact of the eccentric shaft body and the ejection core, and therefore in the process that the driving piece drives the eccentric shaft to rotate, the eccentric shaft body can drive the ejection core to move up and down relative to the lower die, and the ejection function is realized.

In the stamping forming process of the workpiece, the quality of the workpiece is required to be controlled, the thickness of the workpiece is required to be checked, and the workpiece is unqualified when the thickness is larger or smaller. In order to facilitate the control of the quality of the workpiece, the double-acting punch press of the embodiment further comprises an adjusting assembly, wherein the adjusting assembly is used for adjusting the distance between the upper die 2 and the lower die 3.

Specifically, as shown in fig. 2, the lower die 3 includes a fixed platen 29 and a movable platen 30 from bottom to top, and the fixed platen 29 is fixedly provided on the machine base 1. The adjusting assembly comprises a wedge block 31 and a pushing structure, wherein the wedge block 31 is positioned between the fixed platen 29 and the movable platen 30, the upper part of the wedge block 31 and the bottom of the movable platen 30 are inclined planes, and the wedge block 31 is matched with the movable platen 30 through the inclined planes 32. The movable platen 30 and the fixed platen 29 are further provided with a baffle 35 at one end far away from the adjusting assembly, the baffle 35 is fixedly connected with the fixed platen 29, the baffle 35 is in contact with the movable platen 30, and the wedge block 31 penetrates through the baffle 35 and can move horizontally relative to the baffle 35 under the action of the pushing structure. The pushing structure is used for pushing the wedge block 31 to move relative to the fixed platen 29 and the movable platen 30 so as to adjust the height of the movable platen 30 relative to the upper die 2.

Preferably, the pushing structure comprises a motor 33 and a screw rod 34, the motor 33 and the screw rod 34 can be in transmission connection through a second gear and the like, and the screw rod 34 is connected with the wedge block 31. As shown in fig. 6, the motor 33 may be fixedly provided on the housing 1. The lead screw is driven by forward rotation and reverse rotation of the motor, so that the wedge block is pushed to advance or retreat, and the distance between the movable platen and the upper die is adjusted.

When the thickness of the workpiece is detected to be not in accordance with the preset requirement, the motor can drive the screw rod to rotate, so that the wedge block is pushed to horizontally move, the height of the movable platen relative to the upper die is changed, and the workpiece obtained by the next stamping forming can meet the requirement.

As shown in fig. 5, the top of the housing 1 is further provided with an air tank 36, and the air tank 36 is connected to the clutch 24 and the brake 25 through a clutch connection port 362 and a brake connection port 363, respectively, as an air source for the clutch and the brake, and an air inlet 361 and a safety valve 364 are further provided on the air tank 36.

In order to protect the rod body structures, an upper bearing bush and a lower bearing bush are respectively arranged on each connecting rod.

Example 2

The embodiment provides a use method of the double-acting punch press of the embodiment 1, which comprises the following steps:

s1: the material to be processed is put into the lower die 3, the punching machine is started, and the driving assembly transmits power to the first connecting rod 7 and the second connecting rod 8 through the crankshaft 6.

S2: the first connecting rod 7 and the toggle connecting rod group drive the outer sliding block 4 and the upper die 2 to descend, the material to be processed is punched once, and then the upper die 2 and the lower die 3 are pressurized.

S3: in the process of maintaining the pressure of the upper die 2 and the lower die 3 by the first connecting rod 7 and the toggle type connecting rod group, the second connecting rod 8 drives the inner slide 5 to descend, and the material to be processed is punched once.

S4: after the inner slide 5 completes one-time stamping, the second connecting rod 8 drives the inner slide 5 to ascend.

S5: the first connecting rod 7 and the toggle connecting rod group drive the outer slide block 4 and the upper die 2 to ascend, and stamping of one workpiece is completed.

S6: and repeating the steps S1-S5 to finish the stamping processing of a plurality of workpieces.

According to the embodiment, through the operation, the two-time stamping forming processing of the workpiece with the complex shape can be completed within one minute, and the processing efficiency is high.

The invention drives the outer slide block and the inner slide block to act through one crankshaft, the time for the inner slide block and the outer slide block to reach the bottom dead center is different, the outer slide block is driven by the first connecting rod and the toggle connecting rod group, the outer slide block drives the upper die to move downwards, and the upper die and the lower die punch out the shape of a product to form a rough blank. After the first connecting rod and the toggle connecting rod group drive the outer sliding block to descend to the lowest point for the first stamping, the first connecting rod and the toggle connecting rod group keep the pressure of the upper die and the lower die, the upper die and the lower die are locked, the second connecting rod drives the inner sliding block to move downwards, and the inner sliding block performs the secondary stamping forming on the rough blank. In the embodiment, the crankshaft can drive the inner slide block and the outer slide block to do reciprocating motion once every time the crankshaft rotates, so that the production process is simplified, the production time of a workpiece is greatly reduced, and the energy consumption is reduced.

The above embodiments are only for explaining the present invention and do not limit the scope of protection of the present invention, and those skilled in the art make various variations or modifications within the scope of the claims, which fall within the essential content of the present invention.

Claims (10)

1. The double-acting punch press is characterized by comprising a base, a driving assembly, a transmission assembly, an upper die, a lower die, an outer sliding block and an inner sliding block;

the driving assembly is arranged on the base, and the transmission assembly is respectively connected with the driving assembly, the outer sliding block and the inner sliding block; the upper die is connected with the outer sliding block, the lower die is arranged on the base, and the inner sliding block is positioned at the inner side of the outer sliding block;

the transmission assembly comprises a crankshaft, a first connecting rod and a second connecting rod, wherein the first connecting rod and the second connecting rod are connected with the crankshaft through a first connecting rod journal and a second connecting rod journal respectively, the journal central lines of the first connecting rod journal and the second connecting rod journal are parallel, and the first connecting rods are symmetrically arranged on two sides of the second connecting rod in pairs; the transmission assembly further comprises a toggle type connecting rod group, the toggle type connecting rod group comprises a first toggle rod and a second toggle rod which are connected through a second pin shaft, the first connecting rod is connected with the first toggle rod through a third pin shaft, and the second toggle rod is connected with the outer sliding block through a first pin shaft; the inner slide block is rotationally connected with the second connecting rod.

2. The double-acting punch press according to claim 1, wherein the toggle linkage further comprises a third toggle lever (15) connected to the first toggle lever (13), the third toggle lever (15) being connected to the first toggle lever (13) by a third pin (11);

the other end of the third toggle rod (15) is further provided with an auxiliary adjusting block (16), and the auxiliary adjusting block (16) is connected with the third toggle rod (15) through a fourth pin shaft (12).

3. The double-acting punch press according to claim 1, wherein the drive assembly comprises a drive motor (17), a first pulley (18), a second pulley (19), a belt (20), a drive shaft (21), a gear (22), a flywheel (23), a clutch (24) and a brake (25);

an output shaft of the driving motor (17) is connected with the first belt pulley (18), and the first belt pulley (18) is in transmission connection with the second belt pulley (19) through the belt (20);

the second belt pulley (19) and the gear (22) are respectively arranged on the transmission shaft (21), the flywheel (23) and the clutch (24) are arranged at one end of the crankshaft (6), the brake (25) is arranged at the other end of the crankshaft (6), and the flywheel (23) is meshed with the gear (22).

4. The double-acting punch press according to claim 1, further comprising a ejector assembly for ejecting the punch-formed workpiece from the lower die (3); the ejection assembly comprises a driving piece (26), an eccentric shaft (27) and an ejection core (28);

the eccentric shaft (27) comprises an eccentric shaft body, and a left rotating shaft and a right rotating shaft which are respectively arranged at two ends of the eccentric shaft body, wherein the axial leads of the left rotating shaft and the right rotating shaft are on the same straight line, and the axial leads of the eccentric shaft body are parallel to but not coincident with the axial leads of the left rotating shaft;

one of the left rotating shaft or the right rotating shaft is connected with the driving piece (26), and the eccentric shaft body is positioned below the ejector core (28) and is in contact with the ejector core (28);

the ejection core (28) penetrates through the lower die (3).

5. The double-acting punch press of claim 4, wherein the drive member (26) is an oil cylinder or a motor.

6. The double-acting punch press according to claim 1, further comprising an adjusting assembly for adjusting the distance of the upper die (2) and the lower die (3);

the lower die (3) comprises a fixed platen (29) and a movable platen (30) from bottom to top, and the fixed platen (29) is fixedly arranged on the base (1);

the adjusting assembly comprises a wedge block (31) and a pushing structure, wherein the wedge block (31) is positioned between the fixed bedplate (29) and the movable bedplate (30), and the wedge block (31) is matched with the movable bedplate (30) through an inclined plane (32);

the pushing structure is used for pushing the wedge-shaped block (31) to move relative to the fixed platen (29) and the movable platen (30) so as to adjust the height of the movable platen (30) relative to the upper die (2).

7. The double acting punch press as claimed in claim 6, wherein the pushing structure comprises a motor (33) and a screw (34), the motor (33) and the screw (34) being connected by a second gear transmission, the screw (34) being connected with the wedge (31).

8. The double acting punch press as claimed in claim 6 wherein the movable platen (30) and the fixed platen (29) are further provided with a baffle (35) at an end remote from the adjustment assembly, the baffle (35) being fixedly connected to the fixed platen (29), the baffle (35) being in contact with the movable platen (30).

9. A double acting punch press as claimed in claim 3, wherein the top of the housing (1) is provided with a gas reservoir (36), the gas reservoir (36) is connected to the clutch (24) and the brake (25) respectively, and the gas reservoir (36) is provided with a gas inlet (361), a clutch connection port (362), a brake connection port (363) and a safety valve (364).

10. The method of using a double acting punch as claimed in any one of claims 1-9 comprising the steps of:

s1: putting a material to be processed into a lower die (3), starting a punching machine, and transmitting power to a first connecting rod (7) and a second connecting rod (8) by a driving assembly through a crankshaft (6);

s2: the first connecting rod (7) and the toggle connecting rod group drive the outer sliding block (4) and the upper die (2) to descend, the material to be processed is punched once, and then the upper die (2) and the lower die (3) are subjected to pressure maintaining;

s3: in the process of maintaining pressure of the upper die (2) and the lower die (3) by the first connecting rod (7) and the toggle type connecting rod group, the second connecting rod (8) drives the inner slide block (5) to descend, and the material to be processed is punched once;

s4: after the inner slide block (5) completes one-time stamping, the second connecting rod (8) drives the inner slide block (5) to ascend;

s5: the first connecting rod (7) and the toggle connecting rod group drive the outer sliding block (4) and the upper die (2) to ascend, so that stamping of a workpiece is completed;

s6: and repeating the steps S1-S5 to finish the stamping processing of a plurality of workpieces.