CN221473169U - Punch press convenient to mould is changed - Google Patents

Abstract

The utility model discloses a punch press convenient for replacing a die, which relates to the technical field of machining and comprises a punch press and a fixing unit; the upper surface of punch press is provided with drive unit and mould, be provided with the mounting panel on the drive unit, fixed unit is installed respectively the punch press with on the mounting panel. The beneficial effects are that: according to the utility model, the clamping seat is driven by the motor, the bidirectional screw and the sliding block to clamp and fix two sides of the die, the clamping seat is driven by the hydraulic cylinder to move, and the height of the clamping seat is adjusted, so that the die is tightly pressed and fixed on the punch press and the mounting plate by the clamping seat, thereby realizing quick clamping and fixing of the die, effectively improving convenience and firmness of fastening timing of the die clamp, and driving the top plate to jack the die by the spring, avoiding sliding of the die caused by a gap between the die and the clamping seat when the die is worn, and ensuring stability of the die.

Description

Punch press convenient to mould is changed

Technical Field

The utility model relates to the technical field of machining, in particular to a punch press convenient for die replacement.

Background

The punching machine is a device for processing a plate through punching of an upper die and a lower die, can perform blanking, punching, forming, deep drawing, trimming, fine punching, shaping, riveting, extrusion and the like, and is widely applied to various fields. When carrying out different work piece productions, need change the mould that uses, the current mode relies on the bolt fastening when the mould is fixed, need frequently dismantle the bolt when changing the mould, inefficiency.

Through searching, the patent with the Chinese patent publication number of CN219581513U discloses an open punch press convenient for die replacement, which is mainly used for disassembling and fixing an upper die through a clamping block in a disassembling mechanism, thereby improving the die replacement speed.

Compared with the prior art in the related field, when the die is installed and fixed in the mode, the stability of the die is poor, and the die is easy to shake in the production process to cause abrasion, so that the production quality of a product is influenced.

Disclosure of utility model

The present utility model has been made to solve the above problems, and an object of the present utility model is to provide a punch press that facilitates mold replacement.

The utility model realizes the above purpose through the following technical scheme:

a punch press convenient for replacing a die comprises a punch press and a fixing unit;

The upper surface of the punch press is provided with a driving unit and a die, the driving unit is provided with a mounting plate, the fixing units are respectively arranged on the punch press and the mounting plate, the die is divided into an upper die and a lower die, the die is placed on the punch press, the lower die in the die is clamped and fixed through the fixing unit on the punch press, the mounting plate is driven to move to the die through the driving unit, the upper die in the die is clamped and fixed through the fixing unit on the mounting plate, and the quick installation and replacement of the die are completed;

The fixing unit comprises a bidirectional moving component and a first hydraulic cylinder, the bidirectional moving component is respectively arranged on the punch press and the mounting plate, the first hydraulic cylinder is arranged on the bidirectional moving component, a clamping seat is arranged on the first hydraulic cylinder, the clamping seat is L-shaped, buffer cavities are respectively arranged in two sides of the clamping seat, a pressure sensor is arranged in the buffer cavities, a sliding column is slidably arranged on the clamping seat, two ends of the sliding column are respectively provided with a pressing plate and a top plate, the pressing plates are slidably connected in the buffer cavities, a first spring is sleeved on the sliding column, two ends of the first spring are respectively connected with the clamping seat and the top plate, the input end of the first hydraulic cylinder is electrically connected with the output end of an external controller, the external controller controls the first hydraulic cylinder to work by adopting the prior art, the output end of the pressure sensor is electrically connected with the input end of the external controller, when the pressure sensor works in the prior art, the die is placed on the punch press, the bidirectional moving assembly drives the clamping seat to move through the hydraulic cylinder, the clamping seat drives the top plate to move through the sliding column, meanwhile, the hydraulic cylinder drives the clamping seat to descend, the top plate contacts with the side surface of the die, the top plate drives the movable plate to move through the sliding column and compresses the first spring, the hard contact between the top plate and the die is avoided, the pressure sensor is applied with pressure by the pressing plate, the clamping seat is used for clamping and fixing the die or not through the pressure number detected by the pressure sensor, the clamping seat is used for fixing the upper die in the die on the mounting plate through the top plate and fixing the lower die in the die on the punch press, so that the convenience of die replacement and installation is effectively improved, the efficiency of die replacement and installation is improved, and in the use process of the die, when the die is worn and worn to enable a gap to appear between the die and the clamping seat, the spring drives the top plate to tightly prop up the die, so that the gap between the die and the clamping seat is filled, sliding of the die is avoided, when the spring drives the top plate to move, the pressure of the pressure plate to the pressure sensor is reduced, the pressure of the pressure sensor is reduced, and accordingly the bidirectional moving assembly and the hydraulic cylinder can drive the clamping seat to clamp the die again, and the firmness of the die is effectively improved.

Further, the bidirectional moving assembly comprises a motor and a bidirectional screw rod, the motor is respectively arranged on the punch press and the side face of the mounting plate, the bidirectional screw rod is respectively and rotatably arranged on the punch press and the mounting plate, the bidirectional screw rod is connected with the output shaft of the motor, the directions of threads at two ends of the bidirectional screw rod are opposite, the threads at two ends of the bidirectional screw rod are respectively and reversely connected with a sliding block, the sliding blocks are respectively and slidably connected with the punch press and the mounting plate, the first hydraulic cylinder is arranged on the sliding blocks, the input end of the motor is electrically connected with the output end of the external controller, the external controller controls the motor to work, the motor drives the sliding blocks to move through the bidirectional screw rod, and the sliding blocks drive the first hydraulic cylinder to move so as to drive the clamping seat to move, and the clamping seat clamps and fixes the two sides of the die.

Further, the drive unit includes the support, the support sets up on the punch press, be provided with pneumatic cylinder two on the support, install on the flexible end of pneumatic cylinder two the mounting panel, the output of external control ware is connected to the input electricity of pneumatic cylinder two, and external control ware control pneumatic cylinder two work adopts prior art, supports pneumatic cylinder two through the support, drives the mounting panel through pneumatic cylinder two to make the mounting panel and the not mould of co-altitude install of being connected.

Further, still include positioning unit, positioning unit includes accomodates groove, constant head tank, accomodate the groove setting on the punch press, and be located under the mounting panel central point puts, accomodate the inslot and be provided with the telescopic link, cup jointed the spring two on the telescopic link, the upper end of telescopic link is provided with the locating piece, the constant head tank sets up the lower surface of mould, constant head tank sliding connection the locating piece, when the mould moves on the punch press, the mould compresses telescopic link and spring two through the locating piece, and when the locating piece moved to the constant head tank, under the elasticity effect of spring two for the locating piece slides into the constant head tank, thereby accomplishes the quick location installation to the mould, avoids the mould installation to appear the skew, has improved mould installation effectiveness.

Further, still include the guide unit, the guide unit includes the standing groove, the standing groove sets up on the punching press, and be located the both sides of accomodating the groove, be provided with the pneumatic cylinder III in the standing groove, be provided with the mounting bracket on the flexible end of pneumatic cylinder III, be provided with the gyro wheel on the mounting bracket, the output of external control ware is connected to the input electricity of pneumatic cylinder III, and the three work of external control ware control pneumatic cylinder adopts prior art, and the pneumatic cylinder drives the gyro wheel through the mounting bracket and removes for the gyro wheel contacts the mould, leads the material through the gyro wheel to the mould, thereby is convenient for remove on the punch press of mould, has effectively improved the convenience of moving the mould when changing the mould.

Compared with the prior art, the utility model has the following beneficial effects:

1. The clamping device has the advantages that the clamping device is fixed by clamping the two sides of the die through the motor, the bidirectional screw and the sliding block, the clamping device is driven to move through the hydraulic cylinder, the height of the clamping device is adjusted, the clamping device is used for pressing and fixing the die on the punch press and the mounting plate, the die is clamped and fixed rapidly, the convenience and the firmness of the die clamping and fixing timing are effectively improved, the die is prevented from being damaged by hard contact of the top plate and the die through the first spring, the clamping force between the clamping device and the top plate is detected through the first spring, the die clamping and fixing state is determined, meanwhile, the first spring drives the top plate to tightly push the die, the die is prevented from sliding due to gaps between the die and the clamping device when the die is prevented from being worn, and the die is prevented from being unstable and affecting the production quality of products.

2. The die is guided by the guide unit, so that the convenience of movement of the die at the punch is improved, the die is positioned by the positioning unit, the die is rapidly positioned and installed, the die installation is prevented from being inclined, the die is convenient to clamp, and the installation efficiency of the die is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of a punch press for facilitating mold replacement according to the present utility model;

FIG. 2 is an enlarged schematic view of the punch press of FIG. 1A for facilitating mold change according to the present utility model;

FIG. 3 is a schematic top view of a punch press for facilitating mold change according to the present utility model;

FIG. 4 is a schematic cross-sectional elevation view of a punch press for facilitating mold change according to the present utility model;

FIG. 5 is an enlarged schematic view of the punch press of FIG. 4 at B for facilitating mold change according to the present utility model;

FIG. 6 is an enlarged schematic view of the press machine of FIG. 4 at C for facilitating mold change according to the present utility model;

FIG. 7 is a schematic side sectional view of a punch press for facilitating mold change according to the present utility model;

Fig. 8 is a schematic diagram of a cross section of a punch press and a die-mating structure for facilitating die replacement according to the present utility model.

The reference numerals are explained as follows:

1. Punching machine; 2. a fixing unit; 21. a motor; 22. a bidirectional screw; 23. a slide block; 24. a first hydraulic cylinder; 25. a clamping seat; 26. a buffer chamber; 27. a pressure sensor; 28. a pressing plate; 29. a spool; 210. a top plate; 211. a first spring; 3. a driving unit; 31. a bracket; 32. a second hydraulic cylinder; 4. a positioning unit; 41. a storage groove; 42. a telescopic rod; 43. a second spring; 44. a positioning block; 45. a positioning groove; 5. a mounting plate; 6. a material guiding unit; 61. a placement groove; 62. a hydraulic cylinder III; 63. a mounting frame; 64. a roller; 7. and (5) a mold.

Detailed Description

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

The utility model is further described below with reference to the accompanying drawings:

examples

As shown in fig. 1 to 8, a punch press for facilitating mold replacement includes a punch press 1, a fixing unit 2;

The upper surface of the punch 1 is provided with a driving unit 3 and a die 7, the driving unit 3 is provided with a mounting plate 5, the fixing unit 2 is respectively arranged on the punch 1 and the mounting plate 5, as shown in fig. 1 and 8, the die 7 is divided into an upper die and a lower die, the upper die is positioned right above the lower die, the die 7 is arranged on the punch 1, the lower die in the die 7 is clamped and fixed through the fixing unit 2 on the punch 1, the mounting plate 5 is driven by the driving unit 3 to move to the die 7, the upper die in the die 7 is clamped and fixed through the fixing unit 2 on the mounting plate 5, and the quick installation and replacement of the die 7 are completed;

The fixing unit 2 comprises a bidirectional moving component and a first hydraulic cylinder 24, wherein the bidirectional moving component is respectively arranged on the punch 1 and the mounting plate 5, the first hydraulic cylinder 24 is arranged on the bidirectional moving component, a clamping seat 25 is arranged on the first hydraulic cylinder 24, the clamping seat 25 is L-shaped, buffer cavities 26 are respectively arranged in two sides of the clamping seat 25, a pressure sensor 27 is arranged in the buffer cavities 26, a sliding column 29 is slidably arranged on the clamping seat 25, two ends of the sliding column 29 are respectively provided with a pressing plate 28 and a top plate 210, the pressing plate 28 is slidably connected in the buffer cavities 26, a first spring 211 is sleeved on the sliding column 29, two ends of the first spring 211 are respectively connected with the clamping seat 25 and the top plate 210, an input end of the first hydraulic cylinder 24 is electrically connected with an output end of an external controller, the external controller controls the first hydraulic cylinder 24 to work by adopting the prior art, an output end of the pressure sensor 27 is electrically connected with an input end of the external controller, 1-4, 6 and 8, when the die 7 is replaced, the die 7 is placed on the punch 1, the driving unit 3 drives the mounting plate 5 to move, so that the mounting plate 5 moves to the position of the die 7, the bidirectional moving component drives the clamping seat 25 to move through the first hydraulic cylinder 24, the clamping seat 25 drives the top plate 210 to move through the sliding column 29, meanwhile, the first hydraulic cylinder 24 drives the clamping seat 25 to descend, the top plate 210 contacts the side surface of the die 7, the top plate 210 drives the pressing plate 28 to move through the sliding column 29 and compresses the first spring 211, damage to the die 7 caused by hard contact between the top plate 210 and the die 7 is avoided, the pressing plate 28 applies pressure to the pressure sensor 27, whether the clamping seat 25 clamps and fixes the die 7 or not is determined through the pressure numbers detected by the pressing plate 28, the clamping seat 25 fixes the upper die in the die 7 on the mounting plate 5 through the top plate 210, the lower die in the die 7 is fixed on the punch press 1, thereby the convenience of replacing and installing the die 7 is effectively improved, the efficiency of replacing, installing and fixing the die 7 is improved, in the using process of the die 7, when the die 7 is worn to enable a gap to appear between the die 7 and the clamping seat 25, the die 7 is tightly propped up by driving the top plate 210 through the first spring 211, thereby the gap between the die 7 and the clamping seat 25 is filled, the die 7 is prevented from sliding, when the first spring 211 drives the top plate 210 to move, the pressure of the pressure plate 28 to the pressure sensor 27 is reduced, the pressure of the pressure sensor 27 is reduced, and therefore the two-way moving assembly and the first hydraulic cylinder 24 drive the clamping seat 25 to clamp the die 7 again, and the firmness of the die 7 is effectively improved.

The bidirectional moving assembly comprises a motor 21 and a bidirectional screw 22, wherein the motor 21 is respectively arranged on the side surfaces of the punch 1 and the mounting plate 5, the bidirectional screw 22 is respectively rotatably arranged in the punch 1 and the mounting plate 5, the bidirectional screw 22 is connected with an output shaft of the motor 21, threads at two ends of the bidirectional screw 22 are opposite in direction, sliding blocks 23 are respectively connected with threads at two opposite ends of the bidirectional screw 22 in a threaded manner, the sliding blocks 23 are respectively and slidably connected with the punch 1 and the mounting plate 5, a first hydraulic cylinder 24 is arranged on the sliding blocks 23, an input end of the motor 21 is electrically connected with an output end of an external controller, the external controller controls the motor 21 to work, and the bidirectional screw 22 is driven to rotate through the motor 21, and the sliding blocks 23 are driven to move through the bidirectional screw 22, so that the first hydraulic cylinder 24 is driven to move, and a clamping seat 25 is driven to clamp and fix a die 7.

The driving unit 3 comprises a support 31, the support 31 is arranged on the punch 1, a second hydraulic cylinder 32 is arranged on the support 31, a mounting plate 5 is arranged at the telescopic end of the second hydraulic cylinder 32, the input end of the second hydraulic cylinder 32 is electrically connected with the output end of an external controller, the external controller controls the second hydraulic cylinder 32 to work, and the second hydraulic cylinder 32 is supported by the support 31 as shown in fig. 1-3, 7 and 8, and the mounting plate 5 is driven to move by the second hydraulic cylinder 32, so that the mounting plate 5 is close to the die 7, and the mounting plate 5 is connected with the dies 7 with different heights.

The positioning unit 4 further comprises a positioning unit 4, the positioning unit 4 comprises a storage groove 41 and a positioning groove 45, the storage groove 41 is arranged on the punch 1 and is located under the center position of the mounting plate 5, a telescopic rod 42 is arranged in the storage groove 41, a second spring 43 is sleeved on the telescopic rod 42, a positioning block 44 is arranged at the upper end of the telescopic rod 42, the positioning groove 45 is arranged on the lower surface of the die 7, the positioning groove 45 is slidably connected with the positioning block 44, as shown in fig. 3-5 and 8, when the die 7 moves on the punch 1, the die 7 pushes the positioning block 44, the positioning block 44 compresses the telescopic rod 42 and the second spring 43, and when the positioning block 44 moves to the positioning groove 45, the positioning block 44 slides into the positioning groove 45 under the action of the elastic force of the second spring 43, so that the die 7 is rapidly positioned and mounted, the die 7 is prevented from being mounted in a deflection, and the die 7 mounting efficiency is improved.

Still including guide unit 6, guide unit 6 includes standing groove 61, standing groove 61 sets up on punch press 1, and be located the both sides of accomodating groove 41, be provided with pneumatic cylinder three 62 in the standing groove 61, be provided with mounting bracket 63 on the flexible end of pneumatic cylinder three 62, be provided with gyro wheel 64 on the mounting bracket 63, the output of external control ware is connected to the input electricity of pneumatic cylinder three 62, external control ware control pneumatic cylinder three 62 work adopts prior art, as shown in fig. 3, fig. 5, fig. 7, when needs place mould 7 on punch press 1, pneumatic cylinder three 62 shifts out standing groove 61 through mounting bracket 63, mould 7 is placed on gyro wheel 64, carry out the guide through gyro wheel 64 to be convenient for mould 7 remove on punch press 1, the convenience of mould 7 moves in the time of mould 7 has effectively been improved, after the mould 7 is put in place, pneumatic cylinder three 62 drives gyro wheel 64 reverse movement into standing groove 61 through 63, avoid causing the fixed influence to mould 7.

Working principle: when the die 7 is replaced, as shown in fig. 3, 5 and 7, the third hydraulic cylinder 62 drives the roller 64 to move out of the placing groove 61 through the mounting frame 63, the die 7 is placed on the roller 64, and the die 7 is guided through the roller 64, so that the die 7 can conveniently move on the punch 1, and the convenience of moving the die 7 when the die 7 is replaced is effectively improved;

3-5 and 8, the mold 7 pushes the positioning block 44, the positioning block 44 compresses the telescopic rod 42 and the second spring 43, and when the positioning block 44 moves to the positioning groove 45, the positioning block 44 slides into the positioning groove 45 under the action of the elasticity of the second spring 43, so that the rapid positioning and mounting of the mold 7 are completed; as shown in fig. 3, 5 and 7, after the die 7 is installed in place, the third hydraulic cylinder 62 drives the roller 64 to reversely move into the placing groove 61 through the mounting frame 63, so that the influence on the fixing of the die 7 is avoided;

As shown in fig. 1-3, 7 and 8, the second hydraulic cylinder 32 drives the mounting plate 5 to move, so that the mounting plate 5 is close to the die 7; as shown in fig. 1, fig. 4, fig. 7 and fig. 8, the motor 21 drives the bidirectional screw 22 to rotate, the bidirectional screw 22 drives the slide block 23 to move, the slide block 23 drives the first hydraulic cylinder 24 to move, as shown in fig. 1-fig. 4, fig. 6 and fig. 8, the first hydraulic cylinder 24 drives the clamping seat 25 to move, the clamping seat 25 drives the top plate 210 to move through the sliding column 29, meanwhile, the first hydraulic cylinder 24 drives the clamping seat 25 to descend, the top plate 210 contacts with the side surface of the die 7, the top plate 210 drives the pressing plate 28 to move through the sliding column 29 and compresses the first spring 211, the hard contact of the top plate 210 and the die 7 is prevented from damaging the die 7, the pressing plate 28 applies pressure to the pressure sensor 27, the pressure number detected by the pressure sensor 27 determines whether the clamping seat 25 clamps and fixes the die 7, the upper die in the die 7 is fixed on the mounting plate 5, and the lower die in the die 7 is fixed on the punch 1 through the top plate 210, thereby effectively improving the convenience in the replacement and installation and fixation of the die 7.

In the use process of the die 7, as shown in fig. 1-4, 6 and 8, when the die 7 is worn to enable a gap to appear between the die 7 and the clamping seat 25, the first spring 211 drives the top plate 210 to tightly prop up the die 7, so that the gap between the die 7 and the clamping seat 25 is filled, sliding of the die 7 is avoided, when the first spring 211 drives the top plate 210 to move, the pressure of the pressure plate 28 to the pressure sensor 27 is reduced, the pressure of the pressure sensor 27 is reduced, and therefore the motor 21, the bidirectional screw 22 and the first hydraulic cylinder 24 can drive the clamping seat 25 to clamp the die 7 again, the firmness of the die 7 is effectively improved, and the influence of shaking of the die 7 on the production quality of products is avoided.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

Claims (5)

1. The punching machine is characterized by comprising a punching machine (1) and a fixing unit (2);

The upper surface of the punch press (1) is provided with a driving unit (3) and a die (7), the driving unit (3) is provided with a mounting plate (5), and the fixing unit (2) is respectively arranged on the punch press (1) and the mounting plate (5);

The fixing unit (2) comprises a bidirectional moving assembly and a first hydraulic cylinder (24), the bidirectional moving assembly is respectively arranged on the punch press (1) and the mounting plate (5), the first hydraulic cylinder (24) is arranged on the bidirectional moving assembly, a clamping seat (25) is arranged on the first hydraulic cylinder (24), the clamping seat (25) is L-shaped, buffer cavities (26) are respectively arranged in two sides of the clamping seat (25), a pressure sensor (27) is arranged in the buffer cavities (26), a slide column (29) is slidably arranged on the clamping seat (25), pressing plates (28) and top plates (210) are respectively arranged at two ends of the slide column (29), the pressing plates (28) are slidably connected in the buffer cavities (26), first springs (211) are sleeved on the slide column (29), and two ends of the first springs (211) are respectively connected with the clamping seat (25) and the top plates (210).

2. A punch press for facilitating die change according to claim 1, wherein: the bidirectional moving assembly comprises a motor (21) and a bidirectional screw (22), wherein the motor (21) is respectively arranged on the side surfaces of the punch press (1) and the mounting plate (5), the bidirectional screw (22) is respectively rotatably arranged in the punch press (1) and the mounting plate (5), the bidirectional screw (22) is connected with an output shaft of the motor (21), threads at two ends of the bidirectional screw (22) are opposite in direction, sliding blocks (23) are respectively connected with threads at two opposite ends of the bidirectional screw (22) in a threaded mode, the sliding blocks (23) are respectively connected with the punch press (1) and the mounting plate (5) in a sliding mode, and the first hydraulic cylinder (24) is arranged on the sliding blocks (23).

3. A punch press for facilitating die change according to claim 1, wherein: the driving unit (3) comprises a support (31), the support (31) is arranged on the punch press (1), a second hydraulic cylinder (32) is arranged on the support (31), and the mounting plate (5) is mounted on the telescopic end of the second hydraulic cylinder (32).

4. A punch press for facilitating die change according to claim 1, wherein: still include positioning unit (4), positioning unit (4) are including accomodating groove (41), constant head tank (45), accomodate groove (41) setting on punch press (1), and be located under mounting panel (5) central point put, be provided with telescopic link (42) in accomodating groove (41), cup jointed spring two (43) on telescopic link (42), the upper end of telescopic link (42) is provided with locating piece (44), constant head tank (45) set up the lower surface of mould (7), constant head tank (45) sliding connection locating piece (44).

5. A punch press for facilitating mold change according to claim 4, wherein: still include guide unit (6), guide unit (6) include standing groove (61), standing groove (61) set up on punch press (1), and be located the both sides of accomodating groove (41), be provided with pneumatic cylinder three (62) in standing groove (61), be provided with mounting bracket (63) on the flexible end of pneumatic cylinder three (62), be provided with gyro wheel (64) on mounting bracket (63).