Punch structure capable of reducing blanking force

Abstract

The utility model discloses a punch structure capable of reducing blanking force, which comprises a punch body, the punch body comprises at least two punch units with different heights, and materials are sequentially sheared by the different punch units with different heights from high to low in the blanking process. The punches are designed to be different in height, when trimming and blanking operation is carried out, a punching machine drives the punch body to move downwards, due to the fact that height differences exist among the multiple punch units, materials cannot be sheared by all the punches at the same time, the lower punch makes contact with the materials and begins to shear the materials, and the lower punch makes contact with the materials and begins to shear the materials. And then the higher punch shears the remaining part, so that the line length of the material sheared at the same time is effectively reduced, and the blanking force is reduced. Therefore, an existing punching machine with the conventional tonnage can meet the requirement for trimming and blanking tasks which cannot be completed due to too large blanking force in the past, the utilization rate of equipment is improved, and the capital investment of enterprises for purchasing large-scale and high-cost punching machine equipment for meeting the requirement for high blanking force is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of blanking processing especially relates to a punch structure reducing blanking force. BACKGROUND

[0002] In many fields such as metal processing, trimming blanking is a common machining process. However, the existing trimming blanking process often encounters the bottleneck of punch equipment capacity when facing the demand of larger blanking force. Because the blanking force is too large, the conventional punch cannot provide enough power to complete accurate and efficient blanking operation, which not only limits the production efficiency, but also may affect the processing quality of products, leading to problems such as rising scrap rate. In addition, in order to meet the demand of large blanking force, higher tonnage punch equipment is purchased, which significantly increases the production cost and equipment floor area of enterprises, which is not conducive to the sustainable development and market competitiveness of enterprises. Therefore, there is an urgent need for an innovative technical solution that can effectively reduce the blanking force so that the existing conventional tonnage punch can meet the trimming blanking task that cannot be completed due to excessive blanking force in the past, improving the utilization rate of equipment and reducing the capital investment of enterprises to purchase large and high-cost punch equipment to meet the demand of high blanking force. SUMMARY

[0003] The utility model aims at at least one of the problems in the related art. To this end, one of the purposes of the utility model is to provide a punch structure for reducing blanking force, which can reduce the blanking force so that the existing conventional tonnage punch can meet the trimming blanking task that cannot be completed due to excessive blanking force in the past, improving the utilization rate of equipment and reducing the capital investment of enterprises to purchase large and high-cost punch equipment to meet the demand of high blanking force.

[0004] A punch structure for reducing blanking force includes a punch body, the punch body includes at least two punch units with different heights, and in the blanking process, the material is sheared by different punch units with high to low height in turn.

[0005] Further, the punch unit includes two heights, namely a first height punch and a second height punch, and the first height punch and the second height punch are staggered on the punch body.

[0006] Further, when the number of punch units is two, the height difference of the two punch units ranges from 2mm to 5mm.

[0007] Further, the punch unit includes three heights, namely a high punch, a medium punch and a low punch, and the high punch, the medium punch and the low punch are arranged in a triangular shape on the punch body.

[0008] Further, when the number of punch units is three, the height difference between the low punch and the medium punch ranges from 1mm to 3mm, and the height difference between the medium punch and the high punch ranges from 2mm to 4mm.

[0009] Further, the material of the punch body is high-strength alloy steel.

[0010] Further, the punch body is connected to the punch in a bolted manner, and the punch body is provided with threaded holes matched with the bolts, and the punch body is fixed to the punch by tightening the bolts.

[0011] Further, the front edge of the punch body is provided with a round corner, and the radius of the round corner ranges from 0.5 mm to 2 mm.

[0012] Further, the punch body is provided with a cooling channel for cooling medium, and the cooling medium is water or oil, and the diameter of the cooling channel ranges from 3 mm to 8 mm.

[0013] Further, the back surface of the punch body is provided with a buffer device, and the buffer device comprises an elastic rubber pad and a metal pad, and the elastic rubber pad is arranged below the metal pad.

[0014] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0015] The punch structure of the present application is designed with different heights, and when the trimming and blanking operation is performed, the punch body is driven downward by the punch, and since there is a height difference between the plurality of punch units, the material will not be sheared by all the punches at the same time, but will be first contacted and sheared by the lower punch, and then the higher punch will shear the remaining part, which effectively reduces the length of the material sheared at the same time, thereby reducing the blanking force. Therefore, the existing conventional tonnage punch can meet the trimming and blanking task that cannot be completed due to the excessive blanking force in the past, thereby improving the utilization rate of the equipment and reducing the capital investment of the enterprise for purchasing large-scale and high-cost punch equipment to meet the demand for high blanking force. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings incorporated in the specification and forming a part thereof illustrate embodiments consistent with the present application and together with the description serve to explain the principles of the application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0018] In the drawings:

[0019] Fig. 1This is a schematic diagram of an embodiment of the punch structure for reducing punching force according to this application;

[0020] Fig. 2 This is a top view of the punch structure for reducing punching force in this application;

[0021] Fig. 3 This is a schematic diagram of the punch structure for reducing punching force in this application from another perspective.

[0022] Figure label:

[0023] 1. A punch structure for reducing punching force; 10. Punch body; 11. Punch unit; 11a. First height punch; 11b. Second height punch. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] This application provides a punch structure 1 for reducing punching force, including a punch body 10 and a punch unit 11 including two heights, namely a first height punch 11a and a second height punch 11b, and the first height punch 11a and the second height punch 11b are staggered on the punch body 10.

[0027] like Figs. 1 to 3 As shown, the punch body 10 in this embodiment includes a first height punch 11a and a second height punch 11b. During the trimming and blanking operation, the punch press drives the punch body 10 downward. Due to the height difference between the first height punch 11a and the second height punch 11b (the height of the first height punch 11a is greater than the height of the second height punch 11b), the material is not sheared by all punches simultaneously. Instead, the lower punch contacts the material first and begins shearing, followed by the higher punches shearing the remaining portion. This effectively reduces the line length of material being sheared simultaneously, thereby reducing the blanking force. Furthermore, the spacing between adjacent first height punches 11a and second height punches 11b is equal to ensure stability and uniformity during the blanking process.

[0028] In actual production, the height difference between the first height punch 11a and the second height punch 11b, as well as their distribution density and arrangement on the punch body 10, can be reasonably adjusted according to the required blanking force and the characteristics of the material. For example, for thicker materials with higher hardness, the height difference can be appropriately increased to further reduce the blanking force; for blanking parts with complex shapes and high precision requirements, a more uniform punch distribution can be adopted to ensure the stability of the blanking process and the processing accuracy.

[0029] In this embodiment, the height difference of the punch unit 11 is adjusted according to the thickness and hardness of the punching material. When the thickness of the punching material is 1-5mm and the hardness is HB150-HB250, the height difference between the two punch heights is in the range of 2-5mm, that is, the height difference can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. This setting allows the punch structure to achieve the best punching force reduction effect for different material properties, thereby improving punching quality and processing accuracy.

[0030] In this embodiment, in addition to adjusting the height difference, the punching force can be further reduced by optimizing the punch geometry. For example, the punch cutting edge can be designed to be beveled or chamfered, which reduces the friction between the material and the punch during shearing, thereby reducing the required punching force. Furthermore, the punch cutting edge can be treated with a special coating to improve its wear resistance and reduce material adhesion, which also helps reduce resistance during the punching process. Through these combined measures, effective control of the punching force can be achieved, improving punching efficiency and the quality of the processed parts.

[0031] This application provides a punch structure 1 for reducing punching force. The punch unit 11 includes three heights: high punch, medium punch, and low punch. The high punch, medium punch, and low punch are arranged in a triangular shape on the punch body 10.

[0032] The punch body 10 in this embodiment includes a high punch, a medium punch, and a low punch. During the punching process, the punch press drives the punch body 10 to move downwards. The low punch first contacts the material and performs preliminary shearing, then the medium punch further shears the material, and finally the high punch completes the punching of the remaining portion. This step-by-step shearing method greatly reduces the line length of material being sheared simultaneously and significantly reduces the punching force.

[0033] Similarly, in practical applications, the height ratio, distribution pattern, and dimensions and shape of the punch body 10 of the three types of punches can be flexibly adjusted according to specific production needs and material properties. For example, for punching large plates, a larger punch body 10 can be used, and the distribution of the three types of punches can be reasonably arranged to ensure that punching efficiency and processing quality are improved while reducing punching force.

[0034] In this embodiment, for the three types of punches, the height difference between the low-profile punch and the medium-profile punch is 1–3 mm, i.e., the height difference can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. The height difference between the medium-profile punch and the high-profile punch is 2–4 mm, i.e., the height difference can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc. This configuration allows the punch structure to achieve the optimal reduction of punching force for different material properties, thereby improving punching quality and processing accuracy.

[0035] Furthermore, the punch body 10 is made of high-strength alloy steel.

[0036] In this embodiment, the punch body 10 is made of high-strength alloy steel with a hardness of not less than HRC50. This ensures the punch's wear resistance and durability during the punching process, reduces punch wear and replacement frequency, improves production efficiency, and lowers production costs. This material can not only withstand high-intensity punching forces but also has good fatigue resistance, thus ensuring the stability and reliability of the punch during long-term continuous operation. Furthermore, the heat treatment process for the alloy steel material has been carefully designed to achieve an optimal balance between hardness and toughness, further enhancing the punch's service life and processing efficiency.

[0037] Furthermore, to further optimize the performance of the punch, surface treatment technology is introduced in this embodiment. By applying special coating treatments to the surface of the punch, such as nitriding, hard chrome plating, or tungsten carbide coating, the surface hardness and corrosion resistance of the punch can be significantly improved. This surface treatment not only extends the service life of the punch but also reduces the coefficient of friction between the material and the punch to a certain extent, thereby reducing energy consumption and improving punching efficiency during the punching process.

[0038] In actual production, the maintenance and replacement of punches are crucial factors affecting production continuity. Therefore, this embodiment also considers a rapid punch replacement mechanism. An easily disassembled and installed punch structure is designed, allowing for quick replacement of worn or damaged punches without disrupting the overall production schedule. This design not only improves production efficiency but also reduces downtime due to equipment failure, thereby further reducing production costs.

[0039] In summary, the punch structure in this embodiment, through the comprehensive application of material selection, surface treatment technology, and a quick-change mechanism, not only improves punching quality and processing accuracy but also effectively increases production efficiency and reduces production costs. These optimization measures work together to provide new ideas and solutions for improving the punching process.

[0040] Furthermore, the punch body 10 is connected to the punch press by bolts. The punch body 10 is provided with threaded holes that mate with the bolts. The punch body 10 is fixed to the punch press by tightening the bolts.

[0041] In this embodiment, the punch body 10 is connected to the punch press in a detachable manner. The detachable connection is a bolt connection. The punch body 10 is provided with threaded holes that mate with the bolts. By tightening the bolts, the punch body 10 is fixed to the punch press, so that different specifications of punch structures can be quickly changed according to different punching tasks and material characteristics, thereby improving the flexibility and adaptability of production.

[0042] To further enhance the stability and durability of the punch body 10, a novel punch fixing device is introduced in this embodiment. This device includes a fixing seat with internal threads that mates with a threaded hole in the punch body 10. By providing external threads at a corresponding position on the punch press, the fixing seat can be screwed into the punch press, thereby achieving a secure fixation of the punch body 10. This fixing method not only improves the connection strength between the punch and the punch press, but also simplifies the operation process and shortens the replacement time by simply unscrewing the fixing seat when replacing the punch.

[0043] Furthermore, to accommodate plates of varying thicknesses and hardnesses, this embodiment also incorporates an adjustable punch gap. The punch gap can be altered by adjusting the relative position between the punch body 10 and the fixed base. This design allows for fine-tuning of the punch structure according to actual processing requirements, thereby improving processing efficiency while ensuring punching quality.

[0044] Furthermore, the front edge of the punch body 10 is provided with rounded corners, and the radius of the rounded corners ranges from 0.5mm to 2mm.

[0045] In this embodiment, the bottom edge of the punch body 10 is provided with a rounded corner with a radius of 0.5 to 2 mm to reduce the friction between the punch and the material during the punching process, prevent the material from cracking and tearing during punching, improve the surface quality and dimensional accuracy of the punched part, and also help to extend the service life of the punch.

[0046] To accommodate the punching requirements of different materials, this embodiment also provides a replaceable punch tip design. The punch tip adopts a modular design, allowing users to select different material and shape tip modules for replacement based on the different materials and thicknesses being processed. For example, for harder materials, a harder tungsten carbide tip can be selected; while for softer materials, a tougher alloy steel tip can be chosen. This modular design greatly improves the adaptability and flexibility of the punch, while also reducing maintenance costs.

[0047] Furthermore, the punch body 10 is provided with a cooling channel for the passage of a cooling medium, which is water or oil, and the diameter of the cooling channel ranges from 3mm to 8mm.

[0048] In this embodiment, a cooling channel is provided on the punch body 10. The diameter of the cooling channel is between 3 and 8 mm. The cooling medium is water or oil. During the punching process, the punch is cooled through the cooling channel to prevent the punch from softening and deforming due to excessive temperature, thus ensuring the mechanical properties and punching accuracy of the punch. This is especially suitable for high-speed, continuous punching processes.

[0049] To further optimize the cooling effect of the punch, this embodiment also introduces an optimized cooling channel design. A spiral flow channel is designed within the cooling channel of the punch body 10, causing the cooling medium to flow in a spiral pattern within the channel. This design increases the contact area between the cooling medium and the punch body 10, improving cooling efficiency and also helping to uniformly remove heat from the punch body 10. Furthermore, the spiral flow channel design reduces the flow resistance of the cooling medium within the channel, lowering the energy consumption of the cooling system.

[0050] In practical applications, the cooling effect of the punch directly affects the quality of the stamped parts and production efficiency. By optimizing the design of the cooling channels, the working temperature of the punch can be effectively controlled, avoiding material adhesion and punch wear caused by excessive temperature, thereby improving the surface finish and dimensional accuracy of the stamped parts. At the same time, a good cooling effect also helps to extend the service life of the punch, reduce the replacement frequency, and lower production costs.

[0051] Furthermore, a buffer device is provided on the back of the punch body 10. The buffer device includes an elastic rubber pad and a metal pad, with the elastic rubber pad located below the metal pad.

[0052] In this embodiment, a buffer device is provided on the top of the punch body 10. The buffer device includes an elastic rubber pad and a metal pad. The elastic rubber pad is located below the metal pad. When the punch press drives the punch body 10 to return upward, the buffer device can absorb the inertial impact force of the punch, reduce the vibration and wear of the punch press and the punch, improve the stability and reliability of the equipment, and extend the service life of the equipment.

[0053] In this embodiment, the buffer device is not limited to the back or top of the punch body 10, but can also be arranged in other parts of the punch as needed. For example, adding additional buffer devices to the sides or bottom of the punch can further disperse and absorb the impact force generated during the punching process, thereby providing more comprehensive protection for the punch and the punch press. In addition, the material selection and structural design of the buffer device can also be adjusted according to different working environments and material properties to achieve the best buffering effect.

[0054] To further improve the performance of the punch, this embodiment also considers the connection method between the punch and the buffer device. By using high-strength fasteners, it is ensured that the buffer device will not shift or fall off when subjected to impact forces, thereby guaranteeing the stability and durability of the buffering effect. At the same time, the maintenance and replacement of the buffer device are also designed to be simpler, reducing downtime and improving production efficiency.

[0055] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A punch structure for reducing punching force, comprising a punch body, characterized in that, The punch body includes at least two punch units of different heights. During the punching process, the material is sequentially sheared by the different punch units of varying heights from high to low. When the punch unit has two heights, namely a first height punch and a second height punch, the first height punch and the second height punch are staggered on the punch body; When the punch unit has three heights, namely high punch, medium punch and low punch, the high punch, the medium punch and the low punch are arranged in a triangular shape on the punch body.

2. The punch structure for reducing punching force according to claim 1, characterized in that, When there are two types of punch units, the height difference between the two types of punch units ranges from 2mm to 5mm.

3. The punch structure for reducing punching force according to claim 1, characterized in that, When there are three types of punch units, the height difference between the low punch and the medium punch ranges from 1mm to 3mm, and the height difference between the medium punch and the high punch ranges from 2mm to 4mm.

4. A punch structure for reducing punching force according to any one of claims 1 to 3, characterized in that, The punch body is made of high-strength alloy steel.

5. A punch structure for reducing punching force according to any one of claims 1 to 3, characterized in that, The punch body is connected to the punch press by bolts. The punch body is provided with threaded holes that mate with the bolts. The punch body is fixed to the punch press by tightening the bolts.

6. A punch structure for reducing punching force according to any one of claims 1 to 3, characterized in that, The front edge of the punch body is provided with rounded corners, and the radius of the rounded corners ranges from 0.5mm to 2mm.

7. A punch structure for reducing punching force according to any one of claims 1 to 3, characterized in that, The punch body is provided with a cooling channel for the passage of a cooling medium, which is water or oil, and the diameter of the cooling channel ranges from 3mm to 8mm.

8. A punch structure for reducing punching force according to any one of claims 1 to 3, characterized in that, A buffer device is provided on the back of the punch body. The buffer device includes an elastic rubber pad and a metal pad, with the elastic rubber pad located below the metal pad.

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