Replaceable rear cylinder punch structure for die forging of valve body

Abstract

The utility model discloses a replaceable rear cylinder punch structure for die forging of a valve body, which comprises a rear cylinder bearing support plate, a rotary assembly hole is preset in the middle of the upper end of the rear cylinder bearing support plate, and a first punch seat and a second punch seat are fixedly mounted on two sides of the upper end of the rear cylinder bearing support plate respectively. A rotary assembling hole is formed in the upper end of the first punch base, a rotary bearing shaft is movably installed in the rotary assembling hole, an insertion assembling groove is formed in the middle of the upper end of the first punch base and the middle of the upper end of the second punch base in advance, a first-stage punch is movably installed at the upper end of the first punch base, and a second-stage punch is movably installed at the upper end of the second punch base. According to the utility model, a punch mounting structure capable of being quickly inserted and fixed is adopted as a whole, and a disassembling structure capable of being quickly released is correspondingly arranged, so that the punch can be quickly disassembled and assembled according to actual use requirements, and the overall use convenience is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of forging punches for three-way valve bodies, in particular to a replaceable rear cylinder punch structure for forging valve bodies. Background Technique

[0002] The three-way valve is a common valve body. In the production and manufacturing process of the three-way valve body, the mold is an important forging and forming tool.

[0003] Traditional three-way valve bodies are mostly forged by friction presses, and the inner holes of the products cannot be forged. Moreover, the rear cylinder structure of existing multi-directional forging equipment does not have the use effect of upsetting and punching the products in the mold at one time. The rear cylinder punch is not convenient for quick and convenient replacement and disassembly operations during normal use according to specific usage requirements, so that the overall use function is greatly limited. At the same time, due to the limitation of its own rear cylinder punch structure, existing multi-directional forging equipment wastes more raw materials during processing, and the overall comprehensive use performance is poor, resulting in a narrow application range of the overall structure of the rear cylinder punch in multi-directional forging operations, and the overall applicability is greatly affected.

[0004] Based on this, the utility model proposes a replaceable rear cylinder punch structure for forging valve bodies to solve the above problems. Content of the Utility Model

[0005] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the utility model, to avoid obscuring the purpose of this part, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the utility model.

[0006] In view of the above and / or existing problems in the design of the valve body forging punch structure, the present utility model is proposed.

[0007] Therefore, one of the purposes of the present utility model is to provide a replaceable rear cylinder punch structure for forging valve bodies. By adopting a punch installation structure with quick plug-in fixation as a whole and correspondingly equipped with a quick-release disassembly structure, the punch can achieve quick disassembly and assembly operations according to actual usage requirements, enhancing the overall use convenience.

[0008] To achieve the above-mentioned effect, the utility model provides the following technical solutions: a replaceable rear cylinder punch structure for valve body forging, comprising a rear cylinder receiving plate, a rotating assembly hole is preset in the middle position of the upper end of the rear cylinder receiving plate, a first punch seat and a second punch seat are fixedly installed on both sides of the upper end of the rear cylinder receiving plate, a rotating receiving shaft is movably installed inside the rotating assembly hole, a plug-in assembly groove is preset in the middle position of the upper ends of the first punch seat and the second punch seat, a primary punch is movably installed on the upper end of the first punch seat, a secondary punch is movably installed on the upper end of the second punch seat, punch supports are fixedly installed on the bottoms of the primary punch and the secondary punch, a rotating ring is fixedly installed in the middle position inside the rotating assembly hole, a rotating groove is preset in the middle position outside the rotating receiving shaft, and the rotating receiving shaft is movably connected to the rotating ring through the rotating groove.

[0009] As a preferred solution of the replaceable rear cylinder punch structure for valve body die forging of the utility model, positioning threaded holes are symmetrically opened on both sides of the inner and outer sides of the rotating assembly hole, the outer specifications of the rotating ring correspond to the inner specifications of the rotating groove, and the bottom of the rotating receiving shaft is fixedly connected with a hydraulic docking shaft;

[0010] By adding a hydraulic docking shaft with an intended fixed connection at the bottom of the rotating supporting shaft, the rotating supporting shaft and the rear cylinder supporting plate can be stably assembled and docked, and then connected to the external hydraulic cylinder through the hydraulic docking shaft to meet the basic usage requirements of normal work.

[0011] As a preferred solution of the replaceable rear cylinder punch structure for valve body die forging of the utility model, wherein: an extension support plate is fixedly installed at the outer position of the upper end of the rotating bearing shaft, and an adapting through hole is preset at the outer position of the upper end of the extending support plate, and the opening position of the adapting through hole at the upper end of the extending support plate corresponds to and coincides with the opening position of the positioning threaded hole at the upper end of the rear cylinder bearing carrier plate. A tightening positioning bolt is movably installed at the outer upper end of the adapting through hole, and a return spring is movably installed between the tightening positioning bolt and the extending support plate, and a spring rotation groove is opened at the circumferential position of the outer side of the adapting through hole and the circumferential position of the bottom of the end head of the tightening positioning bolt, and the inner specifications of the spring rotation groove are adapted to each other. The tightening positioning bolt is movably connected to the extending support plate through the return spring, and the tightening positioning bolt uses the return spring as the rotation center at the upper end of the extending support plate;

[0012] By adopting an elastic fastening bolt structure that combines a fastening positioning bolt with a return spring, the rear cylinder receiving plate can be positioned and fastened on the rotating receiving shaft by utilizing its own structural characteristics. When rotation is required, it can also be quickly rotated out and will not fall off the extended support plate, making the overall rotation replacement and fastening operations more convenient.

[0013] As a preferred solution of the replaceable rear cylinder punch structure for valve body die forging of the present utility model, wherein: elastic release buttons are movably installed at the side positions of the upper ends of the first punch seat and the second punch seat, alignment card slots are symmetrically and equidistantly formed in a circular shape outside the plug-in assembly groove, the external specifications of the punch support are correspondingly matched with the internal specifications of the plug-in assembly groove, and alignment blocks are symmetrically and fixedly installed at the lower end positions of the outside of the punch support in a circular shape and at equal intervals, and the external specifications of the alignment blocks are adapted to the internal specifications of the alignment card slots;

[0014] By adopting an insertion and fastening structure in which the primary punch and the secondary punch are adapted to the first punch seat and the second punch seat through the plug-in assembly groove and the punch support, the disassembly and replacement operations of the primary punch and the secondary punch on the first punch seat and the second punch seat are made more convenient and fast, and various usage requirements in various usage situations can be met.

[0015] As a preferred solution of the replaceable rear cylinder punch structure for valve body die forging of the present utility model, wherein: the alignment card slots extend into the interior of the plug-in assembly groove and are circularly provided with rotation locking slots, the internal specifications of the rotation locking slots are correspondingly matched with the external specifications of the alignment blocks, and the external thread specifications of the fastening positioning bolts are adapted to the internal thread specifications of the positioning threaded holes;

[0016] By adding the rotation locking slots, on the basis that the primary punch and the secondary punch can be stably docked and assembled through the insertion structure between the punch support and the plug-in assembly groove, the primary punch and the secondary punch can also be rotationally assembled and fastened at the upper ends of the first punch seat and the second punch seat, enhancing the overall assembly fastening property.

[0017] As a preferred solution of the replaceable rear cylinder punch structure for valve body die forging of the present utility model, wherein: an elastic positioning bead is movably installed at the upper end of one of the alignment blocks on the outside of the punch support, a positioning hole is preset at the upper end of one of the rotation locking slots inside the plug-in assembly groove, the position of the positioning hole opened inside the plug-in assembly groove corresponds and coincides with the position of the elastic positioning bead movably installed at the upper end of the alignment block, and the position of the elastic release button movably installed at the upper ends of the first punch seat and the second punch seat corresponds and coincides with the position of the positioning hole opened inside the plug-in assembly groove, and the elastic release button passes through the first punch seat and the second punch seat and is fixedly connected with a release rod, and a pressing spring is sleeved outside the release rod;

[0018] By adding elastic positioning beads and a release lever associated with the elastic release button, the elastic release button helps the first punch and the second punch achieve the use effect of quick dislocation and disassembly during the assembly operation at the upper ends of the first punch seat and the second punch seat. The disassembly is convenient, which is conducive to significantly reducing the overall work preparation time. The overall comprehensive performance and work efficiency have been improved to a certain extent, effectively enriching the overall use functionality.

[0019] Advantages of the present utility model: The present utility model adopts a punch installation structure with quick plug-in fixation as a whole and is correspondingly equipped with a quick-release disassembly structure, enabling the punch to achieve quick disassembly and assembly operations according to actual usage requirements, enhancing the overall use convenience. It can achieve the use effect of quickly replacing the corresponding punch during normal use work. By designing the punch carrier plate as a rotation and replacement structure that can quickly replace the punches on both sides as the working end and correspondingly equipping it with a positioning and fastening structure, the punch structure can achieve the use effect of replacing the working punch according to usage requirements during normal use work, effectively enriching the overall use functionality. At the same time, the quick disassembly and assembly structure of the rear cylinder punch maximally facilitates the regular maintenance operation of the whole during long-term use. For example, in case of serious normal wear, it can also be disassembled and replaced in time, which is conducive to extending the overall service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0021] Figure 1 is the schematic diagram of the split structure of the present utility model;

[0022] Figure 2 is the schematic diagram of the overall structure of the present utility model;

[0023] Figure 3 is the schematic diagram of the assembly structure of the rotary bearing shaft and the rotary assembly hole of the present utility model;

[0024] Figure 4 is the schematic diagram of the cross-sectional structure of the plug-in assembly groove of the present utility model;

[0025] Figure 5 is the schematic diagram of the structure where the spring rotary card slot is opened on the fastening positioning bolt of the present utility model;

[0026] Figure 6 is the present utility model Figure 1 The enlarged structure schematic diagram at position A in;

[0027] Figure 7 For the present utility model Figure 1 is a schematic enlarged view of the structure at position B in this;

[0028] Figure 8 For the present utility model Figure 2 is a schematic enlarged view of the structure at position C in this.

[0029] Reference numerals in the figure: 1, rear cylinder receiving carrier plate; 2, rotary assembly hole; 3, first punch seat; 4, second punch seat; 5, rotary receiving shaft; 6, positioning threaded hole; 7, rotary ring; 8, insertion assembly groove; 9, elastic release button; 10, primary punch; 11, secondary punch; 12, rotary groove; 13, extending support plate; 14, hydraulic docking shaft; 15, alignment card slot; 16, punch support; 17, adaptation through hole; 18, fastening positioning bolt; 19, return spring; 20, spring rotary card slot; 21, rotary locking slot; 22, alignment card block; 23, elastic positioning bead; 24, release rod; 25, pressing spring; 26, positioning card hole. Detailed implementation manners

[0030] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model will be made in conjunction with the schematic diagrams in the specification.

[0031] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific implementation manners disclosed below.

[0032] Secondly, the present utility model will be described in detail with reference to the schematic diagrams. When detailing the implementation scheme of the present utility model, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present utility model herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0033] Please refer to Figures 1-8The utility model provides a technical solution: a replaceable rear cylinder punch structure for valve body die forging, including a rear cylinder receiving plate 1, a rotating assembly hole 2, a first punch seat 3, a second punch seat 4, a rotating receiving shaft 5, a positioning threaded hole 6, a rotating ring 7, a plug-in assembly groove 8, an elastic release button 9, a primary punch 10, a secondary punch 11, a rotating groove 12, an extended support plate 13, a hydraulic docking shaft 14, a positioning groove 15, a punch support 16, an adapting through hole 17, a fastening bolt 18, a reset spring 19, a spring rotating groove 20, a rotating fixing groove 21, an alignment block 22, an elastic positioning bead 23, and a release rod 24, a pressing spring 25 and a positioning card hole 26, a rear cylinder receiving carrier plate 1, a rotating assembly hole 2 is preset in the middle position of the upper end of the rear cylinder receiving carrier plate 1, a first punch seat 3 and a second punch seat 4 are fixedly installed on both sides of the upper end of the rear cylinder receiving carrier plate 1, a rotating receiving shaft 5 is movably installed inside the rotating assembly hole 2, a plug-in assembly groove 8 is preset in the middle position of the upper ends of the first punch seat 3 and the second punch seat 4, a primary punch 10 is movably installed on the upper end of the first punch seat 3, a secondary punch 11 is movably installed on the upper end of the second punch seat 4, and a punch support 16 is fixedly installed at the bottom of the primary punch 10 and the secondary punch 11,A rotating ring 7 is fixedly installed in the middle position inside the rotating assembly hole 2, and a rotating groove 12 is preset in the middle position outside the rotating receiving shaft 5. The rotating receiving shaft 5 is movably connected to the rotating ring 7 through the rotating groove 12. Positioning threaded holes 6 are symmetrically opened at the inner and outer sides of the rotating assembly hole 2. The external specifications of the rotating ring 7 correspond to the internal specifications of the rotating groove 12. A hydraulic docking shaft 14 is fixedly connected to the bottom of the rotating receiving shaft 5, and an extended support plate 13 is fixedly installed at the outer position of the upper end of the rotating receiving shaft 5. An adapting through hole 17 is preset at the outer position of the upper end of the extended support plate 13. The opening position of the adapting through hole 17 at the upper end of the extended support plate 13 corresponds to the opening position of the positioning threaded hole 6 at the upper end of the rear cylinder receiving carrier plate 1. A tightening and fixing bolt 18 is movably installed at the outer upper end of the hole 17, and a return spring 19 is movably installed between the tightening and fixing bolt 18 and the extended support plate 13, and a spring rotation slot 20 is provided at the circumferential position of the outer side of the adaptation through hole 17 and the circumferential position of the bottom of the end of the tightening and fixing bolt 18, and the inner specifications of the spring rotation slot 20 are mutually adapted to the outer specifications of the return spring 19, and the tightening and fixing bolt 18 is movably connected to the extended support plate 13 through the return spring 19, and the tightening and fixing bolt 18 is rotated at the upper end of the extended support plate 13 with the return spring 19 as the rotation center, as a preferred solution of the replaceable rear cylinder punch structure for valve body die forging of the utility model, wherein: the side positions of the upper ends of the first punch seat 3 and the second punch seat 4 are both movable An elastic release button 9 is installed, and an alignment card groove 15 is symmetrically opened at equal intervals in an annular shape on the outside of the plug-in assembly groove 8. The external specifications of the punch support 16 correspond to the internal specifications of the plug-in assembly groove 8, and an alignment card block 22 is symmetrically fixedly installed at equal intervals in an annular shape on the lower end position of the outside of the punch support 16. The external specifications of the alignment card block 22 are compatible with the internal specifications of the alignment card groove 15. As a preferred solution of the replaceable rear cylinder punch structure for valve body die forging of the utility model, the alignment card groove 15 extends to the inside of the plug-in assembly groove 8 and is annularly opened with a rotating fixing groove 21. The internal specifications of the rotating fixing groove 21 correspond to the external specifications of the alignment card block 22. The external thread specifications of the tightening positioning bolt 18 are compatible with the positioning screw. The internal thread specifications of the perforations 6 are adapted to each other, an elastic positioning bead 23 is movably installed on the upper end of one of the alignment blocks 22 outside the punch support 16, and a positioning card hole 26 is preset on the upper end of one of the rotation locking grooves 21 inside the plug-in assembly groove 8. The opening position of the positioning card hole 26 inside the plug-in assembly groove 8 corresponds to the movable installation position of the elastic positioning card bead 23 on the upper end of the alignment card block 22, and the elastic release button 9 at the upper end of the first punch seat 3 and the second punch seat 4 corresponds to the opening position of the positioning card hole 26 inside the plug-in assembly groove 8. The elastic release button 9 passes through the first punch seat 3 and the second punch seat 4 and is fixedly connected to a release rod 24, and the outer sleeve of the release rod 24 is provided with a pressing spring 25;

[0034] By adding a hydraulically docked shaft 14 that is fixedly connected as expected at the bottom of the rotating bearing shaft 5, after the rotating bearing shaft 5 and the rear cylinder bearing plate 1 are stably assembled and docked, they can be interconnected through the hydraulically docked shaft 14 and an external hydraulic cylinder to meet the basic usage requirements of normal operation. By adopting an elastic fastening bolt structure that combines a tightly fixed positioning bolt 18 and a return spring 19, it can use its own structural characteristics to position and fasten the rotation operation of the rear cylinder bearing plate 1 on the rotating bearing shaft 5. And when rotation is required, it can also quickly rotate and disengage without falling off the extension support plate 13, making the overall rotation replacement and fastening operations more convenient. By using an insertion and fastening structure where the primary punch 10 and the secondary punch 11 are adapted to the first punch seat 3 and the second punch seat 4 through the insertion assembly groove 8 and the punch support 16, the disassembly and replacement operations of the primary punch 10 and the secondary punch 11 on the first punch seat 3 and the second punch seat 4 are more convenient and fast, and can meet various usage requirements in multiple usage scenarios. By adding a rotating locking groove 21, on the basis that the primary punch 10 and the secondary punch 11 can achieve stable docking and assembly through the insertion structure between the punch support 16 and the insertion assembly groove 8, they can also complete the assembly and fastening of the primary punch 10 and the secondary punch 11 at the upper ends of the first punch seat 3 and the second punch seat 4 through rotation, enhancing the overall assembly fastening property. By adding an elastic positioning bead 23 and a release lever 24 associated with the elastic release button 9, the elastic release button 9 helps to achieve the usage effect of quick dislocation and disassembly during the assembly operation of the primary punch 10 and the secondary punch 11 at the upper ends of the first punch seat 3 and the second punch seat 4. The disassembly is convenient, which is conducive to greatly reducing the overall work preparation time. The overall comprehensive usage performance and work efficiency have been improved to a certain extent, effectively enriching the overall usage functionality.

[0035] Working principle:

[0036] When performing multi-directional die forging operations, the primary punch 10 and the secondary punch 11 should be stably assembled on the first punch seat 3 and the second punch seat 4 first, and the primary punch 10 and the secondary punch 11 should be stably and correspondingly inserted into the plug-in assembly slot 8 by utilizing the adaptation relationship between the punch support 16 and the plug-in assembly slot 8, and the alignment block 22 should be inserted into the alignment slot 15 and inserted to the bottom. During this process, the alignment block 22 with the elastic positioning bead 23 should be aligned with the alignment slot 15 on the side of the elastic release button 9, and then the punch support 16 is rotated to make the alignment block 22 stably inserted into the rotating fixing slot 21, and the elastic positioning bead 23 is inserted from The first punch 10 and the second punch 11 are popped out from the positioning card hole 26 to realize the assembly and fastening operation of the primary punch 10 and the secondary punch 11 on the first punch seat 3 and the second punch seat 4. When the primary punch 10 and the secondary punch 11 need to be disassembled and replaced, it is only necessary to press the elastic release button 9 to make the release rod 24 press the elastic positioning card bead 23 to make the elastic positioning card bead 23 disengage from the positioning card hole 26, and then rotate the punch support 16 in the opposite direction to make the alignment card block 22 rotate out of the rotation locking groove 21. Under the structural characteristics of the pressing spring 25, the elastic release button 9 is reset, and then the whole is rotated between the hydraulic docking shaft 14 at the bottom of the rotating receiving shaft 5 and the external hydraulic cylinder. The first punch 10 and the second punch 11 are driven to perform die forging operations on the material in the mold as the main punch. When the first punch 10 and the second punch 11 need to be replaced, the fixing bolt 18 can be screwed out from the positioning threaded hole 6. The fixing bolt 18 is ejected under the action of the reset spring 19 and remains on the upper end of the extension support plate 13 to prevent parts from being lost. Under the support of the rotating connection structure between the rotating ring 7 and the rotating groove 12, the rear cylinder is rotated to receive the carrier plate 1, so that the first punch 10 and the second punch 11 are replaced. The positions of the primary punch 10 and the secondary punch 11 are swapped. With the support of the assembly structure, the primary punch 10 and the secondary punch 11 can select appropriate punch types according to usage requirements. When the main punch is rotated and replaced, the threaded connection relationship between the tightening positioning bolt 18 and the positioning threaded hole 6 is used to tighten the position relationship of the rear cylinder receiving plate 1 outside the rotating receiving shaft 5, thereby realizing stable and continuous deep punching of the forging blank and forming the product. It effectively saves materials on the basis of enriching the overall functionality, reduces the processing steps, and correspondingly improves the overall work efficiency, thereby effectively improving the overall comprehensive performance.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A replaceable rear cylinder punch structure for valve body die forging, comprising a rear cylinder receiving carrier plate (1), characterized in that: A rotary assembly hole (2) is preset in the middle position of the upper end of the rear cylinder receiving carrier plate (1); a first punch seat (3) and a second punch seat (4) are fixedly mounted on both sides of the upper end of the rear cylinder receiving carrier plate (1); a rotary receiving shaft (5) is movably mounted inside the rotary assembly hole (2); a plug-in assembly groove (8) is preset in the middle position of the upper ends of the first punch seat (3) and the second punch seat (4); a primary punch (10) is movably mounted on the upper end of the first punch seat (3); a secondary punch (11) is movably mounted on the upper end of the second punch seat (4); punch supports (16) are fixedly mounted on the bottoms of the primary punch (10) and the secondary punch (11); a rotary ring (7) is fixedly mounted in the middle position inside the rotary assembly hole (2); a rotary groove (12) is preset in the middle position outside the rotary receiving shaft (5); and the rotary receiving shaft (5) is movably connected to the rotary ring (7) via the rotary groove (12).

2. The replaceable rear cylinder punch structure for valve body die forging according to claim 1, characterized in that: Positioning threaded holes (6) are symmetrically provided on both the inner and outer sides of the rotating assembly hole (2); the outer specifications of the rotating ring (7) correspond to the inner specifications of the rotating groove (12); and the bottom of the rotating receiving shaft (5) is fixedly connected to a hydraulic docking shaft (14).

3. The replaceable rear cylinder punch structure for valve body die forging according to claim 2, characterized in that: An extension support plate (13) is fixedly mounted at the outer position of the upper end of the rotating support shaft (5); an adapting through hole (17) is preset at the outer position of the upper end of the extension support plate (13); the opening position of the adapting through hole (17) at the upper end of the extension support plate (13) corresponds to the opening position of the positioning threaded hole (6) at the upper end of the rear cylinder receiving carrier plate (1); a tightening positioning bolt (18) is movably mounted at the outer upper end of the adapting through hole (17); and the tightening positioning bolt (18) is movably mounted between the extension support plate (13). A return spring (19) is provided, and a spring rotation slot (20) is provided at a circumferential position outside the adapting through hole (17) and a circumferential position at the bottom of the end of the fastening and positioning bolt (18). The inner specifications of the spring rotation slot (20) are adapted to the outer specifications of the return spring (19). The fastening and positioning bolt (18) is movably connected to the extension support plate (13) through the return spring (19). The fastening and positioning bolt (18) is rotated at the upper end of the extension support plate (13) with the return spring (19) as the center of rotation.

4. The replaceable rear cylinder punch structure for valve body die forging according to claim 3, characterized in that: The first punch seat (3) and the second punch seat (4) are both movably provided with elastic release buttons (9) at the side positions of the upper ends, the plug-in assembly slot (8) is provided with symmetrically arranged alignment slots (15) at equal intervals in an annular shape outside the plug-in assembly slot (8), the external specifications of the punch support (16) and the internal specifications of the plug-in assembly slot (8) are mutually matched, and the lower end position of the punch support (16) is symmetrically and fixedly provided with alignment blocks (22) at equal intervals in an annular shape outside the punch support (16), and the external specifications of the alignment blocks (22) and the internal specifications of the alignment slot (15) are mutually matched.

5. The replaceable rear cylinder punch structure for valve body die forging as claimed in claim 4, characterized in that: The alignment slot (15) extends to the plug-in assembly slot (8) and is provided with a rotation locking slot (21) in an annular shape. The internal specifications of the rotation locking slot (21) and the external specifications of the alignment block (22) correspond to each other. The external thread specifications of the fastening positioning bolt (18) and the internal thread specifications of the positioning threaded hole (6) are adapted to each other.

6. The replaceable rear cylinder punch structure for valve body die forging according to claim 5, characterized in that: An elastic positioning bead (23) is movably mounted on the upper end of one of the alignment blocks (22) outside the punch support (16), and a positioning hole (26) is preset at the upper end of one of the rotation locking grooves (21) inside the plug-in assembly groove (8). The opening position of the positioning hole (26) inside the plug-in assembly groove (8) and the movably mounted position of the elastic positioning bead (23) on the upper end of the alignment block (22) correspond to each other, and the movably mounted position of the elastic release button (9) on the upper ends of the first punch seat (3) and the second punch seat (4) correspond to the opening position of the positioning hole (26) inside the plug-in assembly groove (8). The elastic release button (9) passes through the first punch seat (3) and the second punch seat (4) and is fixedly connected to a release rod (24), and the release rod (24) is sleeved with a pressing spring (25) on the outside.

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