Round tube punching die

Abstract

The utility model relates to a round pipe punching die. The round pipe punching die comprises an upper die plate, a lower die plate and a circumferential punching mechanism. The circumferential punching mechanism is arranged between the upper die plate and the lower die plate and comprises a punching shaft, a punching rod, a driving assembly and a fixing assembly, the punching shaft is arranged on the lower die plate and provided with a punching hole, the punching rod is slidably arranged on the lower die plate through the driving assembly, and the fixing assembly comprises a front fixing block, a rear fixing block and a side ejection block. The punching shaft is arranged between the front fixing block and the rear fixing block, the punching shaft is sleeved with the side ejecting block, and the side ejecting block can stretch out and draw back in the axial direction of the punching shaft; when the die is closed, the punching shaft is sleeved with the round pipe, the side ejecting block and the rear fixing block are matched to fix the round pipe, and the punching rod is driven by the driving assembly to punch into the punching hole so as to punch the round pipe. According to the circular pipe punching device, circumferential punching of a circular pipe can be achieved, it can be guaranteed that the circular pipe cannot move during punching, and therefore the punching quality can be effectively improved, and the production quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mould technical field especially relates to a round pipe punching die. BACKGROUND

[0002] With the high -speed development of national economy, the demand of market to the punching die is growing unceasingly, and people have more and more realized the importance of product quality, cost and new product development capability. Many mould enterprises increase the investment intensity for technical progress, and regard technical progress as the important motive force of enterprise development. And punching die manufacturing is one of the most basic elements in the whole chain, and the punching die is the main process equipment of punching processing, and the punching die is completed by the relative movement of upper and lower dies.

[0003] At present, in the processing of hollow round pipe, due to the shape, it is easy to slip when punching on the hollow round pipe, which leads to low machining precision and affects production quality. UTILITY MODEL CONTENTS

[0004] Therefore, it is necessary to provide a round pipe punching die aiming at the problem that the existing round pipe is easy to slip in the processing, which leads to low machining precision and affects production quality.

[0005] A round pipe punching die, comprising:

[0006] An upper die plate;

[0007] A lower die plate, which is arranged correspondingly with the upper die plate; and

[0008] A circumferential punching mechanism, which is arranged between the upper die plate and the lower die plate, and comprises a punching shaft, a punching rod, a driving assembly and a fixing assembly, wherein the punching shaft is arranged on the lower die plate, the punching shaft is provided with a punching hole matched with the punching rod, the punching rod is slidably arranged on the lower die plate through the driving assembly, and the fixing assembly comprises a front fixing block, a rear fixing block and a side top block, wherein the front fixing block and the rear fixing block are arranged oppositely on the lower die plate, the punching shaft is arranged between the front fixing block and the rear fixing block, and the side top block is sleeved outside the punching shaft and can move in the axial direction of the punching shaft.

[0009] When the die is closed, the round pipe is sleeved outside the punching shaft, the side top block cooperates with the rear fixing block to fix the round pipe, and the punching rod is punched into the punching hole under the driving of the driving assembly to realize the punching of the round pipe.

[0010] The circular pipe punching die can realize the circumferential punching of the circular pipe through the cooperation of the upper die plate, the lower die plate and the circumferential punching mechanism, and can ensure that the circular pipe will not be displaced during punching, thereby effectively improving the punching quality and production quality.

[0011] In one of the embodiments, the driving assembly comprises a mounting seat, a circumferential sliding block, a circumferential telescopic rod and a circumferential abutting block, the mounting seat is fixedly arranged on the lower die plate, the mounting seat is provided with a mounting slope, the circumferential sliding block is slidingly arranged on the mounting slope, the punching rod is fixedly connected with the circumferential sliding block, one end of the circumferential telescopic rod is in abutment with the circumferential sliding block, and the circumferential abutting block is fixedly arranged on the lower die plate, and the other end of the circumferential telescopic rod is in abutment with the circumferential abutting block.

[0012] In one of the embodiments, the circumferential punching mechanism further comprises a punching driving block, the punching driving block is fixedly connected with the upper die plate, the end of the circumferential sliding block away from the punching rod is provided with a first punching slope, and the punching driving block is provided with a second punching slope matched with the first punching slope.

[0013] In one of the embodiments, the circumferential punching mechanism further comprises a fixing assembly, the fixing assembly further comprises a rotating piece, one end of the punching shaft is threadedly connected with the rear fixing block, the front fixing block is axially provided with a fixing hole, the rotating piece is rotatably arranged in the fixing hole, and the other end of the punching shaft is fixedly connected with the rotating piece.

[0014] In one of the embodiments, the fixing assembly further comprises a limiting screw rod and a side top spring, the limiting screw rod is threadedly connected with the rear fixing block through the side top block, one end of the side top spring is in abutment with the rear fixing block, and the other end of the side top spring is in abutment with the side top block.

[0015] In one of the embodiments, the circular pipe punching die further comprises an axial shaping mechanism, the axial shaping mechanism is arranged between the upper die plate and the lower die plate, the axial shaping mechanism comprises a shaping rod, an axial sliding block, an axial telescopic rod and an axial abutting block, the axial sliding block is slidingly arranged on the lower die plate, the shaping rod is fixedly connected with the axial sliding block, one end of the axial telescopic rod is in abutment with the axial sliding block, the axial abutting block is fixedly connected with the lower die plate, and the other end of the axial telescopic rod is in abutment with the axial abutting block.

[0016] In one of the embodiments, the axial shaping mechanism further comprises an upper shaping block and a lower shaping block, the upper shaping block is fixedly arranged on the upper die plate, the upper shaping block is provided with an upper shaping groove, the lower shaping block is fixedly arranged on the lower die plate, the lower shaping block is provided with a lower shaping groove, and the upper shaping groove and the lower shaping groove are matched to form a shaping cavity.

[0017] In one of the embodiments, the axial shaping mechanism further comprises a shaping driving block fixedly arranged on the upper die plate, and the axial slider is provided with a first shaping inclined surface at the end away from the shaping rod, and the shaping driving block is provided with a second shaping inclined surface matched with the first shaping inclined surface.

[0018] In one of the embodiments, the axial shaping mechanism further comprises a clamping assembly, the clamping assembly comprising an upper clamping block and a lower clamping block, the upper clamping block being fixedly arranged on the upper die plate, the upper clamping block being provided with an upper clamping groove, the lower clamping block being fixedly arranged on the lower die plate, the lower clamping block being provided with a lower clamping groove, and the upper clamping groove and the lower clamping groove being matched to form a clamping cavity matched with the circular pipe.

[0019] In one of the embodiments, the clamping assembly further comprises a fixed top block, a movable top block, a clamping screw and a clamping spring, the fixed top block being fixedly arranged on the lower die plate, the movable top block being sleeved outside the shaping rod, the clamping screw being fixedly connected with the axial slider through the movable top block, one end of the clamping spring being in abutment with the axial slider, and the other end of the clamping spring being in abutment with the movable top block. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an assembly structure diagram of the circular pipe punching die in one of the embodiments of the utility model;

[0021] Figure 2 It is an assembly structure diagram of the circular pipe punching die in one of the embodiments of the utility model; Figure 1

[0022] It is an internal structure diagram of the upper die plate, the pressing plate, the pressing telescopic rod, the lower die plate and the axial shaping mechanism in the circular pipe punching die shown in the figure; Figure 3 Figure 1 It is an internal structure diagram of the upper die plate, the lower die plate and the circumferential punching mechanism in the circular pipe punching die shown in the figure.

[0023] Figure 4 Figure 1 It is an internal structure diagram of the upper die plate, the lower die plate and the circumferential punching mechanism in the circular pipe punching die shown in the figure.

[0024] Meaning of reference signs in the drawings:

[0025] 100 - circular pipe punching die;

[0026] 10 - upper die plate;

[0027] 20 - lower die plate;

[0028] 30 - pressing plate;

[0029] ​​40 - compacting telescopic rod;

[0030] 50 - axial shaping mechanism, 51 - shaping rod, 52 - axial slider, 521 - first shaping slope, 53 - axial telescopic rod, 54 - axial abutment block, 55 - upper shaping block, 56 - lower shaping block, 57 - shaping cavity, 58 - shaping driving block, 581 - second shaping slope, 59 - clamping assembly, 591 - upper clamping block, 592 - lower clamping block, 593 - clamping cavity, 594 - fixed top block, 595 - movable top block, 596 - clamping screw;

[0031] 60 - circumferential punching mechanism, 61 - punching shaft, 611 - punching hole, 62 - punching rod, 63 - driving assembly, 631 - mounting seat, 632 - circumferential slider, 6321 - first punching slope, 633 - circumferential abutment block, 64 - punching driving block, 65 - fixed assembly, 651 - front fixed block, 652 - rear fixed block, 653 - rotating piece, 654 - side top block, 655 - limiting screw. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0035] In the present application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0037] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0038] Please refer to Figure 1 and Figure 3 , the round pipe punching die 100 of an embodiment of the present application, including the upper die plate 10, the pressing plate 30, the compression telescopic rod 40, the lower die plate 20, the axial shaping mechanism 50 and the circumferential punching mechanism 60, the pressing plate 30 is movably connected to the upper die plate 10, the compression telescopic rod 40 is fixedly connected with the upper die plate 10, and the telescopic end of the compression telescopic rod 40 is in abutment with the pressing plate 30. The axial shaping mechanism 50 and the circumferential punching mechanism 60 are arranged between the upper die plate 10 and the lower die plate 20.

[0039] Please refer to Figure 2 and Figure 3The axial shaping mechanism 50 comprises a shaping rod 51, an axial slider 52, an axial telescopic rod 53 and an axial abutting block 54. The axial slider 52 is slidingly arranged on the lower die plate 20. The shaping rod 51 is fixedly connected with the axial slider 52. One end of the axial telescopic rod 53 is in abutment with the axial slider 52. The axial abutting block 54 is fixedly connected with the lower die plate 20. The other end of the axial telescopic rod 53 is in abutment with the axial abutting block 54. Through cooperation of the axial telescopic rod 53 and the axial abutting block 54, when the mold is opened, the axial slider 52 can be reset backward with the shaping rod 51 under the action of the axial telescopic rod 53. Thus, the operator can quickly take out the circular pipe after shaping, thereby improving the production efficiency.

[0040] Please refer to Figure 2 and Figure 3 The axial shaping mechanism 50 further comprises an upper shaping block 55 and a lower shaping block 56. The upper shaping block 55 is fixedly arranged on the pressing plate 30. The upper shaping block 55 is provided with an upper shaping groove. The lower shaping block 56 is fixedly arranged on the lower die plate 20. The lower shaping block 56 is provided with a lower shaping groove. The upper shaping groove and the lower shaping groove are matched to form a shaping cavity 57. Through cooperation of the shaping rod 51 and the shaping cavity 57, the circular pipe can be shaped into a target shape.

[0041] Please refer to Figure 2 and Figure 3 The axial shaping mechanism 50 further comprises a shaping driving block 58. The shaping driving block 58 is fixedly arranged on the upper die plate 10. An end of the axial slider 52 away from the shaping rod 51 is provided with a first shaping inclined surface 521. The shaping driving block 58 is provided with a second shaping inclined surface 581 matched with the first shaping inclined surface 521.

[0042] Please refer to Figure 2 and Figure 3 The axial shaping mechanism 50 further comprises a clamping assembly 59. The clamping assembly 59 comprises an upper clamping block 591 and a lower clamping block 592. The upper clamping block 591 is fixedly arranged on the pressing plate 30. The upper clamping block 591 is provided with an upper clamping groove. The lower clamping block 592 is fixedly arranged on the lower die plate 20. The lower clamping block 592 is provided with a lower clamping groove. The upper clamping groove and the lower clamping groove are matched to form a clamping cavity 593 matched with the circular pipe. The clamping cavity 593 can clamp the circular pipe in the circumferential direction, thereby ensuring that the circular pipe will not be displaced during shaping, thereby improving the production quality.

[0043] Please refer to Figure 2 and Figure 3The clamping assembly 59 further comprises a fixed top block 594, a movable top block 595, a clamping screw 596 and a clamping spring. The fixed top block 594 is fixedly arranged on the lower die plate 20. The movable top block 595 is sleeved on the shaping rod 51. The clamping screw 596 is fixedly connected with the axial sliding block 52 through the movable top block 595. One end of the clamping spring is in abutment with the axial sliding block 52, and the other end of the clamping spring is in abutment with the movable top block 595. The cooperation of the fixed top block 594 and the movable top block 595 can clamp the circular pipe from the axial direction, further ensuring that the circular pipe will not be displaced during shaping, and improving the production quality.

[0044] Please refer to Figure 2 and Figure 4 The number of the circumferential punching mechanisms 60 is two, and the two circumferential punching mechanisms 60 are arranged adjacent to each other. In this way, one mold can complete the punching of two circular pipes at the same time, effectively improving the production efficiency. The circumferential punching mechanism 60 comprises a punching shaft 61, a punching rod 62 and a driving assembly 63. The punching shaft 61 is arranged on the lower die plate 20. The punching shaft 61 is provided with a punching hole 611 adapted to the punching rod 62. The punching rod 62 is slidably arranged on the lower die plate 20 through the driving assembly 63. The number of the punching rod 62 is multiple. The multiple punching rods 62 are sequentially arranged along the length direction of the punching shaft 61. The driving assembly 63 corresponds to the punching rod 62 one by one. In this way, the punching of multiple different angles of a single circular pipe can be completed at one time, effectively improving the production efficiency.

[0045] Please refer to Figure 2 and Figure 4 The driving assembly 63 comprises a mounting seat 631, a circumferential sliding block 632, a circumferential telescopic rod and a circumferential abutment block 633. The mounting seat 631 is fixedly arranged on the lower die plate 20. The mounting seat 631 is provided with a mounting inclined surface. The circumferential sliding block 632 is slidably arranged on the mounting inclined surface. The punching rod 62 is fixedly connected with the circumferential sliding block 632. One end of the circumferential telescopic rod is in abutment with the circumferential sliding block 632. The circumferential abutment block 633 is fixedly arranged on the lower die plate 20. The other end of the circumferential telescopic rod is in abutment with the circumferential abutment block 633.

[0046] Please refer to Figure 2 and Figure 4 The circumferential punching mechanism 60 further comprises a punching driving block 64. The punching driving block 64 is fixedly connected with the upper die plate 10. The end of the circumferential sliding block 632 away from the punching rod 62 is provided with a first punching inclined surface 6321. The punching driving block 64 is provided with a second punching inclined surface adapted to the first punching inclined surface 6321.

[0047] Please refer toFigure 2 And Figure 4 The punching shaft 61 is fixed on the lower die plate 20 through a fixing assembly 65, the fixing assembly 65 comprises a front fixing block 651, a rear fixing block 652 and a rotating piece 653, the front fixing block 651 and the rear fixing block 652 are arranged on the lower die plate 20 correspondingly, one end of the punching shaft 61 is threadedly connected with the rear fixing block 652, the front fixing block 651 is axially provided with a fixing hole, the rotating piece 653 is rotatably arranged in the fixing hole, and the other end of the punching shaft 61 is fixedly connected with the rotating piece 653. In this way, after punching, the screw of the rear fixing block 652 is loosened, the rotating piece 653 is rotated, the punching shaft 61 and the circular pipe are turned over, the screw of the rear fixing block 652 is fixed again, the punching shaft 61 and the circular pipe are fixed, the time for re-adjusting the machine is saved, and the production efficiency is improved.

[0048] Please refer to Figure 2 And Figure 4 The fixing assembly 65 further comprises a side top block 654, a limiting screw 655 and a side top spring, the side top block 654 is sleeved on the punching shaft 61, the limiting screw 655 is threadedly connected with the rear fixing block 652 through the side top block 654, one end of the side top spring is abutted against the rear fixing block 652, and the other end of the side top spring is abutted against the side top block 654. In this way, the displacement of the circular pipe during punching is avoided, and the production quality is effectively improved.

[0049] The working principle of the circular pipe punching die 100 in the embodiment is as follows: an operator places a circular pipe in the lower clamping groove, and makes the movable top block 595 tightly abut against the circular pipe, so that the upper die plate 10 and the lower die plate 20 are pressed together, the axial sliding block 52 drives the shaping rod 51 to punch into the shaping cavity 57 under the cooperation of the first shaping inclined surface 521 and the second shaping inclined surface 581, so that the circular pipe is shaped; after the die is opened, the shaped circular pipe is sleeved on the punching shaft 61, and the side top block 654 tightly abuts against the circular pipe; the upper die plate 10 and the lower die plate 20 are pressed together again, the circumferential sliding block 632 drives the punching rod 62 to punch into the punching hole 611 under the cooperation of the first punching inclined surface 6321 and the second punching inclined surface, so that the circular pipe is punched.

[0050] The circular pipe can be circumferentially punched through the cooperation of the upper die plate 10, the lower die plate 20 and the circumferential punching mechanism 60, and the displacement of the circular pipe during punching is avoided, so that the punching quality and the production quality are effectively improved.

[0051] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered as within the scope of the present disclosure.

[0052] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it shall not be understood as a limitation on the scope of the present application patent. It should be noted that, for those skilled in the art, under the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent shall be subject to the appended claims.

Claims

1. A round tube piercing die characterized by, The utility model relates to a kind of circular tube punching device, including: Upper die plate; Lower die plate, the lower die plate is set up with the upper die plate correspondingly; And Circumferential punching mechanism, the circumferential punching mechanism is located between the upper die plate and the lower die plate, the circumferential punching mechanism includes punching shaft, punching rod, drive assembly and fixed assembly, the punching shaft is set on the lower die plate, the punching shaft is provided with the punching hole that is adapted with the punching rod, the punching rod is slidably set on the lower die plate by the drive assembly, the fixed assembly includes front fixed block, rear fixed block and side top block, the front fixed block and the rear fixed block are oppositely set on the lower die plate, the punching shaft is located between the front fixed block and the rear fixed block, the side top block is sleeved outside the punching shaft, the side top block can be telescopic and moved along the axial direction of the punching shaft; When mould is closed, circular tube is sleeved outside the punching shaft, the side top block cooperates with the rear fixed block to fix circular tube, the punching rod is punched into the punching hole under the driving of the drive assembly, to realize the punching of circular tube.

2. A round tube piercing die according to claim 1, characterized in that, The drive assembly includes mounting seat, circumferential slider, circumferential telescopic rod and circumferential abutment block, the mounting seat is fixedly set on the lower die plate, the mounting seat is provided with installation slope, the circumferential slider is slidably set on the installation slope, the punching rod is fixedly connected with the circumferential slider, one end of the circumferential telescopic rod is in abutment with the circumferential slider, the circumferential abutment block is fixedly set on the lower die plate, the other end of the circumferential telescopic rod is in abutment with the circumferential abutment block.

3. A round tube piercing die according to claim 2, characterized in that The circumferential punching mechanism further includes punching drive block, the punching drive block is fixedly connected with the upper die plate, the end of the circumferential slider away from the punching rod is provided with first punching slope, the punching drive block is provided with second punching slope adapted with the first punching slope.

4. A round tube piercing die according to claim 3, characterized in that The circumferential punching mechanism further includes fixed assembly, the fixed assembly further includes rotating member, one end of the punching shaft is threadedly connected with the rear fixed block, the front fixed block is axially provided with fixed hole, the rotating member is rotatably set in the fixed hole, the other end of the punching shaft is fixedly connected with the rotating member.

5. A round tube piercing die according to claim 4, characterized in that The fixed assembly further includes limiting screw rod and side top spring, the limiting screw rod is threadedly connected with the rear fixed block through the side top block, one end of the side top spring is in abutment with the rear fixed block, the other end of the side top spring is in abutment with the side top block.

6. A round tube piercing die according to claim 5, characterized in that Further include axial shaping mechanism, the axial shaping mechanism is located between the upper die plate and the lower die plate, the axial shaping mechanism includes shaping rod, axial slider, axial telescopic rod and axial abutment block, the axial slider is slidably set on the lower die plate, the shaping rod is fixedly connected with the axial slider, one end of the axial telescopic rod is in abutment with the axial slider, the axial abutment block is fixedly connected with the lower die plate, the other end of the axial telescopic rod is in abutment with the axial abutment block.

7. A round tube piercing die according to claim 6, characterized in that The axial shaping mechanism further comprises a pressing plate and a pressing telescopic rod, the pressing plate is movably connected to the upper die plate, the pressing telescopic rod is fixedly connected to the upper die plate, the telescopic end of the pressing telescopic rod is in abutment with the pressing plate, the axial shaping mechanism further comprises an upper shaping block and a lower shaping block, the upper shaping block is fixedly arranged on the pressing plate, the upper shaping block is provided with an upper shaping groove, the lower shaping block is fixedly arranged on the lower die plate, the lower shaping block is provided with a lower shaping groove, the upper shaping groove and the lower shaping groove are matched to form a shaping cavity.

8. A round tube piercing die according to claim 7, characterized in that The axial shaping mechanism further comprises a shaping driving block, the shaping driving block is fixedly arranged on the upper die plate, the axial sliding block is provided with a first shaping inclined surface at the end away from the shaping rod, the shaping driving block is provided with a second shaping inclined surface matched with the first shaping inclined surface.

9. A round tube piercing die according to claim 8, characterized in that, The axial shaping mechanism further comprises a clamping assembly, the clamping assembly comprises an upper clamping block and a lower clamping block, the upper clamping block is fixedly arranged on the pressing plate, the upper clamping block is provided with an upper clamping groove, the lower clamping block is fixedly arranged on the lower die plate, the lower clamping block is provided with a lower clamping groove, the upper clamping groove and the lower clamping groove are matched to form a clamping cavity matched with the circular pipe.

10. A round tube piercing die according to claim 9, characterized in that The clamping assembly further comprises a fixed top block, a movable top block, a clamping screw and a clamping spring, the fixed top block is fixedly arranged on the lower die plate, the movable top block is sleeved outside the shaping rod, the clamping screw is fixedly connected to the axial sliding block through the movable top block, one end of the clamping spring is in abutment with the axial sliding block, the other end of the clamping spring is in abutment with the movable top block.

Images