Numerically controlled turret punch press die assembly punch

Abstract

The utility model relates to numerical control punch press processing equipment technical field, specifically disclose a numerical control turret punch press die combination punch, which comprises an outer tube and a stamping rod slidingly fitted in the inner tube of the outer tube, and the end of the stamping rod is fixedly provided with a wear-resistant module. The wear-resistant module comprises a threaded rod, a fixed disc, a curved block and a trapezoidal punch, the fixed disc is threadedly connected with the end of the stamping rod through the threaded rod, the trapezoidal punch is arranged on the other side of the fixed disc, and the curved block is clamped or embedded between the trapezoidal punch and the fixed disc. In addition, a guide assembly comprising a conical guide block and a guide ring is arranged between the outer tube and the stamping rod. The utility model is designed with a split type wear-resistant module, which realizes the separate replacement of the punch after local wear and tear, significantly reduces the mold maintenance cost, and at the same time, uses the curved block as a buffer medium to effectively absorb the stamping reaction force, avoids the fracture of the threaded connection caused by rigid impact, and greatly prolongs the service life of the punch.

Description

Technical Field

[0001] This utility model relates to the field of CNC punching equipment technology, and in particular to a CNC turret punch die combination punch. Background Technology

[0002] As a core forming equipment in the sheet metal processing industry, the CNC turret punch press works by using the high-frequency reciprocating motion of the die punch to shear, punch, or stretch metal sheets. During this process, the die punch, as a key component that directly contacts the workpiece and performs the stamping action, needs to withstand extremely high impact loads and intense mechanical friction with the sheet metal. Therefore, it places extremely high demands on the strength and wear resistance of the punch.

[0003] In existing technological systems, traditional punches for stamping dies mostly adopt a one-piece structure design, meaning the punch head and the main body of the punch rod at the rear end are machined from the same high-strength alloy steel. However, in long-term actual production, wear mainly occurs at the front end of the punch, which directly contacts the sheet metal, while the main body of the punch rod often does not reach its service life limit. This situation, where the entire punch rod is forced to be scrapped due to localized wear at the front end of the punch, not only results in a significant waste of high-quality die steel but also significantly increases the die consumable costs and maintenance burden for processing enterprises.

[0004] To address material waste, some existing technologies have developed split-type punches, attempting to separate the punch tip from the rod body via a threaded connection. However, this simple split-connection method ignores the enormous rigid reaction force during stamping. When the punch impacts the sheet metal at high speed, the immense instantaneous impact force is transmitted directly to the connecting thread without any buffering, resulting in severe stress concentration at the root of the thread. Under long-term high-frequency alternating stress, the connection is highly susceptible to metal fatigue fracture, leading to punch detachment or damage, severely impacting the lifespan of the die and production safety.

[0005] Therefore, this utility model proposes a CNC turret punch mold combination punch to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a CNC turret punch mold combination punch, which aims to improve the structural defects in the prior art, such as the need to scrap the entire punch after wear, resulting in high maintenance costs, and the direct application of rigid impact force to the connection, which can easily lead to breakage.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a CNC turret punch die combination punch, comprising: an outer tube, and a punching rod slidably fitted inside the outer tube; and a wear-resistant module fixedly disposed at the end of the punching rod.

[0008] The wear-resistant module has a split assembly structure, which specifically includes a threaded rod, a fixed disc, a curved block, and a trapezoidal punch.

[0009] Furthermore, the threaded rod is vertically fixed to the side surface of the fixed plate facing the stamping rod, and the trapezoidal punch is provided on the side surface of the fixed plate away from the stamping rod; the threaded rod is threaded into the threaded hole at the end of the stamping rod, thereby fixing the fixed plate to the stamping rod; the curved block is sandwiched between the trapezoidal punch and the fixed plate, or the curved block is embedded in the side of the trapezoidal punch facing the fixed plate, so that the impact force received by the trapezoidal punch must pass through the curved block and the fixed plate in sequence before it can be transmitted to the stamping rod.

[0010] Preferably, a guide assembly is further provided between the inner wall of the outer tube and the outer wall of the stamping rod; the guide assembly includes a guide ring fixedly embedded in the inner wall of the outer tube and a tapered guide block fixedly protruding from the outer wall of the stamping rod; the inner side wall of the guide ring is provided with a guide groove extending axially, and the tapered guide block is slidably disposed inside the guide groove.

[0011] Preferably, the tapered guide block has a trapezoidal structure with a wider top and a narrower bottom along the radial cross section of the stamping rod, and the cross-sectional shape of the guide groove is adapted to the shape of the tapered guide block to limit the rotation of the stamping rod relative to the outer tube.

[0012] Preferably, the guide assembly further includes a positioning block and a center ring; the positioning block is fixedly disposed at the inner edge step of the bottom of the outer tube, and the center ring is sleeved and fixed to the outer peripheral surface of the stamping rod; the center ring is located above the positioning block, and the outer diameter of the center ring is larger than the inner diameter of the positioning block, for use in abutting and limiting the position of the stamping rod when it moves downward.

[0013] Preferably, a spring module is also inserted into the inner side of the top end of the outer tube; the spring module fills the gap formed between the inner wall of the outer tube and the outer wall of the stamping rod, and the bottom end of the spring module abuts against the protruding stepped surface of the outer wall of the stamping rod.

[0014] Preferably, a stacked column block is fixedly provided on the outer wall of the end of the stamping rod away from the wear-resistant module; the stacked column block is composed of a number of annular protrusions arranged at equal intervals along the axial direction of the stamping rod, which is used to increase the contact friction between the stamping rod and the external drive mechanism.

[0015] Preferably, the end of the stamping rod is provided with an internal threaded hole that mates with the threaded rod, and the fixing plate is screwed into the internal threaded hole through the threaded rod to fit against the end face of the stamping rod.

[0016] Preferably, the curved block has a sheet-like structure that matches the bottom shape of the trapezoidal punch, and the material hardness of the curved block is lower than that of the trapezoidal punch, preferably an elastic buffer material or a soft metal material.

[0017] Preferably, the bottom of the trapezoidal punch is provided with a receiving groove, the curved block is embedded in the receiving groove, and the curved block is exposed on the surface of the receiving groove and abuts against the fixed plate.

[0018] This utility model has the following beneficial effects: 1. This utility model solves the problem in the prior art of scrapping the entire mold and incurring high maintenance costs due to local wear of the punch by setting up a split wear-resistant module and using a threaded rod and a fixed plate to detachably connect the trapezoidal punch to the main body of the stamping rod. It achieves the technical effect of restoring production by only replacing the front-end worn component, significantly reducing the mold usage cost and improving equipment maintenance efficiency.

[0019] 2. This utility model solves the problem in the prior art that the stamping reaction force is directly transmitted to the threaded connection in a rigid manner, which easily causes stress concentration and thread breakage, by embedding or clamping a curved block between the trapezoidal punch and the fixed plate as a stress buffer medium. It achieves the technical effect of absorbing and dispersing high-frequency impact energy by utilizing the micro-deformation characteristics of the curved block, protecting the internal connection structure, and greatly extending the service life of the mold. Attached Figure Description

[0020] Figure 1 This is a perspective view of a CNC turret punch mold combination punch proposed in this utility model; Figure 2 This is a schematic diagram of the stacked column block structure of the combined punch of the CNC turret punch press mold according to the present invention; Figure 3 This is a schematic diagram of the threaded rod structure of a CNC turret punch mold combination punch proposed in this utility model; Figure 4 This is a schematic diagram of the conical guide block structure of the die assembly punch of a CNC turret punch press proposed in this utility model.

[0021] Legend: 1. Outer tube; 2. Stamping rod; 3. Spring module; 4. Wear-resistant module; 401. Threaded rod; 402. Fixed plate; 403. Curved block; 404. Trapezoidal punch; 5. Guide assembly; 501. Conical guide block; 502. Guide ring; 503. Positioning block; 504. Center ring; 6. Stacked column block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figure 1 - Figure 4 This utility model provides an embodiment of a CNC turret punch press mold combination punch, including an outer tube 1 as the main support structure and a punching rod 2 that is slidably fitted inside the outer tube 1. The outer tube 1 is fixed on the turret station of the punch press as the mounting base of the entire mold. The punching rod 2 reciprocates linearly along the axial direction of the outer tube 1 under the drive of external force to perform the punching operation. In order to realize the rapid replacement of the punch and stress buffering, a split wear-resistant module 4 is fixedly provided at the end of the punching rod 2. The wear-resistant module 4 is specifically composed of a threaded rod 401, a fixed plate 402, a curved block 403 and a trapezoidal punch 404.

[0024] Specifically, the fixed plate 402 serves as the connecting base for the wear-resistant module 4. A threaded rod 401 is vertically fixed to the side surface of the fixed plate 402 facing the stamping rod 2. A threaded blind hole adapted to the threaded rod 401 is provided at the end of the stamping rod 2. The threaded rod 401 is screwed into the threaded blind hole to achieve a threaded fastening connection, so that the end face of the fixed plate 402 and the end face of the stamping rod 2 are kept in close contact, thereby firmly installing the entire wear-resistant module 4 on the stamping rod 2. When it is necessary to change the mold, only the wear-resistant module 4 needs to be unscrewed, without replacing the entire stamping rod 2.

[0025] A trapezoidal punch 404 is provided on the side of the fixed plate 402 facing away from the stamping rod 2. To solve the problem of rigid impact, a curved block 403 is sandwiched between the trapezoidal punch 404 and the fixed plate 402, or a receiving groove is provided at the bottom of the trapezoidal punch 404, and the curved block 403 is embedded in the receiving groove. The curved block 403 is exposed on the surface of the receiving groove and abuts against the fixed plate 402. The curved block 403 has a sheet-like structure that matches the shape of the bottom of the trapezoidal punch 404. The material of the curved block 403 is an elastic buffer material or a soft metal material, and its hardness is lower than that of the material of the trapezoidal punch 404. During the stamping process, the reaction impact force generated by the trapezoidal punch 404 contacting the plate will not be directly rigidly transmitted to the threaded rod 401. Instead, it is passed through the curved block 403 for energy absorption and buffering, and then transmitted to the stamping rod 2 through the fixed plate 402. This hierarchical force transmission structure effectively disperses stress and protects the threaded connection from fracture due to fatigue. The guide assembly 5 includes a guide ring 502 and a tapered guide block 501. The guide ring 502 is fixedly embedded in the inner wall of the outer tube 1. The inner wall of the guide ring 502 has a through or non-through guide groove along the axial direction. The tapered guide block 501 is fixedly protruding from the outer wall of the stamping rod 2, and the position of the tapered guide block 501 corresponds to the position of the guide groove. The radial cross-section of the tapered guide block 501 along the stamping rod 2 has a trapezoidal structure that is wider at the top and narrower at the bottom. The cross-sectional shape of the guide groove is similar to that of the tapered guide block 501. The shape of the guide block 501 is perfectly matched. In the assembled state, the tapered guide block 501 on the stamping rod 2 is slidably inserted into the guide groove of the inner guide ring 502 of the outer tube 1. This specific trapezoidal fit structure can not only restrict the stamping rod 2 from rotating around its own axis and ensure that the angle of the trapezoidal punch 404 is always accurately aligned with the processing position, but also use the upper wide and lower narrow structural characteristics to prevent the stamping rod 2 from coming out of the outer tube 1 at the extreme position, thereby greatly improving the guiding accuracy and safety of the stamping motion.

[0026] To provide effective limiting and buffering protection at the end of the stamping stroke, the guide assembly 5 also includes a positioning block 503 and a central ring 504. The positioning block 503 is fixedly set at the inner edge step of the bottom of the outer tube 1, forming an inwardly protruding annular support surface. The central ring 504 is sleeved and fixed on the outer peripheral surface of the stamping rod 2, and the central ring 504 is located above the positioning block 503 in the axial position. The outer diameter of the central ring 504 is designed to be larger than the inner diameter of the positioning block 503. When the stamping rod 2 moves downward to perform the stamping operation, once the preset maximum stroke is reached, the bottom surface of the central ring 504 will abut against the top surface of the positioning block 503 to limit the movement. The rigid structure of the outer tube 1 itself is used to withstand the excess impact force. This hard limiting fit prevents the punch from excessively penetrating and damaging the mold or machine tool, and also protects the internal elastic elements such as springs from excessive compression. In a preferred embodiment, to achieve automatic reset of the stamping rod 2 after completing the stamping action, a spring module 3 is also inserted into the inner side of the top end of the outer tube 1. The spring module 3 fills the annular gap formed between the inner wall of the outer tube 1 and the outer wall of the stamping rod 2. Specifically, a protruding stepped surface is provided on the outer wall of the stamping rod 2 as a support structure. The bottom end of the spring module 3 directly abuts against the stepped surface of the stamping rod 2, while the top end of the spring module 3 abuts against the corresponding limiting structure inside the outer tube 1. When the stamping rod 2 moves downward, the spring module 3 is compressed and stores energy. When the external force is removed, the spring module 3 releases its elastic force to push the stamping rod 2 upward to reset.

[0027] As another preferred embodiment, in order to increase the contact friction between the stamping rod 2 and the external drive mechanism and prevent slippage or power transmission loss during high-speed stamping, a stacked column block 6 is fixedly provided on the top outer wall of the stamping rod 2 away from the wear-resistant module 4. The stacked column block 6 is not a simple smooth column, but is composed of several annular protrusions or rough textured structures arranged at equal intervals along the axial direction of the stamping rod 2. This structure significantly increases the roughness and friction coefficient of the contact surface, ensuring that the driving force can be efficiently and accurately transmitted to the stamping rod 2.

[0028] Furthermore, there are more refined optimization schemes for the specific material selection and installation of the curved block 403 in the wear-resistant module 4. In order to further improve the buffering effect, the material of the curved block 403 is preferably a high-toughness elastic buffer material or a soft metal material with good ductility. The material itself is used to absorb high-frequency impact energy through elastic-plastic deformation. At the same time, in order to ensure that the curved block 403 is installed stably and does not shift, the depth of the receiving groove at the bottom of the trapezoidal punch 404 can be designed to be slightly less than the thickness of the curved block 403. This allows the curved block 403 to be pre-compressed between the trapezoidal punch 404 and the fixed plate 402 when the threaded rod 401 is tightened to the fixed plate 402, forming a pre-tight fit, eliminating assembly gaps, and thus maintaining the rigid connection stability of the overall structure while ensuring the buffering function.

[0029] Working Principle: First, the mold is assembled and installed. The operator assembles the selected wear-resistant module 4 onto the end of the stamping rod 2. Specifically, the threaded rod 401 is aligned with the threaded blind hole at the end of the stamping rod 2 and screwed in until the fixing plate 402 is tightly fitted to the end face of the stamping rod 2. During this process, if the wear-resistant module 4 uses an embedded curved block 403, the thread tightening action will cause the fixing plate 402 to press the curved block 403, ensuring that there is no looseness inside the punch assembly. Subsequently, the assembled stamping rod 2 is inserted into the outer tube 1, and the guide installation is completed by the cooperation of the tapered guide block 501 and the guide ring 502. Finally, the spring module 3 is installed at the top of the outer tube 1 to complete the setting of the reset mechanism.

[0030] When the punch press starts working, the striking head of the punch press acts on the stacked column block 6 at the top of the punch rod 2. The annular protrusion structure on the surface of the stacked column block 6 increases the contact friction, ensuring efficient transmission of the striking force. After being subjected to force, the punch rod 2 moves downward against the resistance of the spring module 3. During this downward movement, the tapered guide block 501 on the side of the punch rod 2 slides precisely along the guide groove of the guide ring 502 on the inner wall of the outer tube 1. Since the tapered guide block 501 has a trapezoidal structure that is wider at the top and narrower at the bottom and is adapted to the groove, this fit effectively restricts the circumferential rotation of the punch rod 2, ensuring that the angle of the trapezoidal punch 404 below is always accurately aligned, and also preventing the punch rod 2 from deviating from the axis.

[0031] When the trapezoidal punch 404 contacts the sheet metal for stamping, a huge reaction impact force is generated instantly. This impact force first acts on the trapezoidal punch 404, and then is transmitted to the curved block 403 located behind it. The curved block 403 utilizes its own elastic buffer material or soft metal material properties to produce a small amount of elastic or plastic deformation, thereby absorbing and dispersing the peak stress. The buffered force is then transmitted to the main body of the stamping rod 2 by the fixed plate 402. This staged force transmission mechanism avoids the impact force acting directly and rigidly on the threaded connection of the threaded rod 401, significantly reducing the risk of thread breakage due to stress concentration.

[0032] After stamping is completed, the external force is removed. The compressed spring module 3 releases its elasticity, pushing the stamping rod 2 upward to return to its initial position. If the stamping rod 2 accidentally moves too far downward during the stamping process, the central ring 504 fixed on the stamping rod 2 will abut against the positioning block 503 at the bottom of the outer tube 1. This mechanical hard limit prevents the stamping rod 2 from continuing to strike downward, thereby protecting the mold structure and the machine tool.

Claims

1. A CNC turret punch die assembly punch, comprising an outer tube (1) and a punching rod (2) slidably fitted inside the outer tube (1). Its features are, The CNC turret punch mold combination punch also includes a wear-resistant module (4) fixedly disposed at the end of the punching rod (2). The wear-resistant module (4) includes a threaded rod (401), a fixed disc (402), a curved block (403), and a trapezoidal punch (404). The threaded rod (401) is vertically fixed to the side surface of the fixed plate (402) facing the stamping rod (2), and the trapezoidal punch (404) is provided on the side surface of the fixed plate (402) away from the stamping rod (2). The threaded rod (401) is threaded into the threaded blind hole at the end of the stamping rod (2), so that the end face of the fixed plate (402) is in close contact with the end face of the stamping rod (2); The curved block (403) is sandwiched between the trapezoidal punch (404) and the fixed plate (402). The impact force on the trapezoidal punch (404) is transmitted to the punching rod (2) through the curved block (403) and the fixed plate (402) in sequence.

2. The CNC turret punch press die combination punch according to claim 1, characterized in that, A guide assembly (5) is provided between the inner wall of the outer tube (1) and the outer wall of the stamping rod (2). The guide assembly (5) includes a guide ring (502) fixedly embedded in the inner wall of the outer tube (1) and a tapered guide block (501) fixedly protruding from the outer wall of the stamping rod (2). The inner wall of the guide ring (502) is provided with a guide groove extending along the axial direction, and the conical guide block (501) is slidably disposed inside the guide groove.

3. The CNC turret punch press die combination punch according to claim 2, characterized in that, The tapered guide block (501) has a trapezoidal structure with a wider top and a narrower bottom along the radial section of the stamping rod (2). The cross-sectional shape of the guide groove is adapted to the shape of the tapered guide block (501) to restrict the stamping rod (2) from rotating relative to the outer tube (1).

4. The CNC turret punch die combination punch according to claim 2, characterized in that, The guide component (5) also includes a positioning block (503) and a center ring (504); The positioning block (503) is fixedly installed at the inner edge step of the bottom of the outer tube (1), and the central ring (504) is sleeved and fixed on the outer peripheral surface of the stamping rod (2); The central ring (504) is located above the positioning block (503), and the outer diameter of the central ring (504) is larger than the inner diameter of the positioning block (503), which is used to abut and limit the positioning block (503) when the stamping rod (2) moves downward.

5. A CNC turret punch press die combination punch according to claim 1, characterized in that, A spring module (3) is also inserted into the inner side of the top end of the outer tube (1); The spring module (3) fills the gap formed between the inner wall of the outer tube (1) and the outer wall of the stamping rod (2), and the bottom end of the spring module (3) abuts against the protruding step surface of the outer wall of the stamping rod (2) to reset the stamping rod (2).

6. The CNC turret punch die combination punch according to claim 1, characterized in that, A stacked column block (6) is fixedly provided on the outer wall of the end of the stamping rod (2) away from the wear-resistant module (4); The stacked column block (6) is composed of several annular protrusions arranged at equal intervals along the axial direction of the stamping rod (2), which are used to increase the contact friction between the stamping rod (2) and the external drive mechanism.

7. A CNC turret punch press die combination punch according to claim 1, characterized in that, The curved block (403) has a sheet-like structure that matches the bottom shape of the trapezoidal punch (404), and the material of the curved block (403) is an elastic cushioning material or a soft metal material.

8. A combination punch for a CNC turret punch press according to claim 1, characterized in that, The bottom of the trapezoidal punch (404) is provided with a receiving groove, the curved block (403) is embedded in the receiving groove, and the curved block (403) is exposed on the surface of the receiving groove and abuts against the fixed plate (402).

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