A die for trimming and punching metal parts of automobile chassis

Abstract

The invention belongs to the technical field of stamping dies, and specifically discloses a die for trimming and punching automobile chassis metal parts, comprising a stamping upper die fixed on a moving end of a stamping machine and a stamping lower die fixed on the stamping machine, a stamping die cavity for forming automobile chassis metal parts is formed between the stamping upper die and the stamping lower die; the stamping upper die comprises a multi-stage stamping head to process a material strip passing through the stamping machine step by step into automobile chassis metal parts; the stamping upper die also comprises a temperature control structure for conveying a refrigerant, the temperature control structure is used to cooperate with the multi-stage stamping head to adjust a first temperature value of the stamping die cavity to be within a preset temperature range; a temperature control flow channel for conveying a refrigerant is formed on the stamping lower die; the temperature control flow channel is connected to the temperature control structure to adjust a second temperature value of the automobile chassis metal parts to be within a preset temperature range; the invention has the following advantages: the mold thermal balance is achieved through the temperature control structure, material rebound is reduced, and the finished product precision, mold life and production stability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of stamping dies, and in particular to a die used for trimming and punching metal parts of automobile chassis. Background Art

[0002] Existing stamping dies are generally composed of two independent parts, the upper die and the lower die. When cooling the die, cooling methods designed separately for the upper die and the lower die are usually adopted, or temperature management is performed through external direct temperature control. Since the upper die and the lower die are independent of each other, this decentralized or external cooling method is difficult to achieve overall and uniform temperature control, resulting in unbalanced heat transfer and heat dissipation inside the die. Especially in the case of high-temperature stamping or large-scale rapid stamping, the temperature difference between the upper and lower dies will be more obvious, making it difficult to maintain the overall thermal balance of the die. At the same time, since metal materials will produce thermal stress and deformation during the cooling process, the uneven distribution of the temperature field will directly affect the rebound size of the stamped parts, making it difficult to ensure the dimensional accuracy and quality of the parts.

[0003] For this reason, a die for trimming and punching of automobile chassis metal parts is proposed to solve the above-mentioned problems. Summary of the invention

[0004] The present invention aims to provide a die for trimming and punching automobile chassis metal parts, so as to solve or improve the above-mentioned technical problem that the independent cooling method of the existing stamping die cannot ensure temperature uniformity, thereby affecting the thermal balance of the die and the dimensional accuracy of the parts.

[0005] In view of this, a first aspect of the present invention is to provide a die for trimming and punching automobile chassis metal parts.

[0006] The first aspect of the present invention provides a mold for trimming and punching automobile chassis metal parts, including a stamping upper mold fixed on the moving end of a stamping machine and a stamping lower mold fixed on the stamping machine, a stamping die cavity for forming the automobile chassis metal parts is formed between the stamping upper mold and the stamping lower mold; the stamping upper mold includes a multi-stage punching head to process the material strip passing through the stamping machine step by step into the automobile chassis metal parts; the stamping upper mold also includes a temperature control structure for conveying a refrigerant, the temperature control structure is used to cooperate with the multi-stage punching head to adjust the first temperature value of the stamping die cavity to a preset temperature range when the stamping upper mold and the stamping lower mold continue to process the material strip; a temperature control flow channel for conveying the refrigerant is formed on the stamping lower mold; when the stamping upper mold and the stamping lower mold are closed, the temperature control flow channel is connected to the temperature control structure to adjust the second temperature value of the automobile chassis metal parts to a preset temperature range.

[0007] In any of the above technical solutions, the multi-stage punching head includes a first punching head, a second punching head and a third punching head which are independent of each other, so as to successively perform pressing, trimming and punching on the material strip; the third punching head is connected to the temperature control structure to transport the refrigerant after punching.

[0008] In any of the above technical solutions, the stamping lower die includes at least one stamping punch, and the bottom of the first stamping head is equipped with a stamping die that matches the stamping punch; when the stamping upper die and the stamping lower die are closed, the third stamping head penetrates the automobile chassis metal parts and the stamping die.

[0009] In any of the above technical solutions, the third punching head includes a punching rod, and the punching rod is provided with a guide hole along the longitudinal direction; the guide hole is used to connect the temperature control structure with the temperature control flow channel, or to connect the temperature control structure with the stamping die cavity.

[0010] In any of the above technical solutions, a socket is provided in the middle of the top end of the punching punch, and when the temperature control structure and the temperature control flow channel are connected, the socket accommodates part of the punching rod.

[0011] In any of the above technical solutions, the temperature control flow channel includes: a plurality of refrigerant chambers, the refrigerant chambers are divided and formed by partitions arranged inside the stamping lower die, the bottom of the partition is higher than the bottom of the stamping lower die, so that the bottoms of all the refrigerant chambers are connected; at least one of the refrigerant chambers is connected to the jack; a temperature control hole is longitudinally opened on the upper surface of the stamping lower die, and the temperature control hole is connected to the refrigerant chamber; the circumferential edge of the automobile chassis metal part is an extended edge, and the temperature control hole corresponds to the extended edge in the longitudinal direction.

[0012] In any of the above technical solutions, the stamping lower die is provided with a discharge window in the transverse direction, the discharge window is used to accommodate waste material after the third punching head performs punching, and the inner cavity of the discharge window is connected to the insertion hole and the refrigerant cavity.

[0013] In any of the above technical solutions, a through tube is installed on the inner wall of the socket, and the through tube is a hollow porous structure; the inner wall of the through tube is adapted to the side wall of the punching rod; when the automobile chassis metal part is in contact with the upper surface of the stamping punch, the upper surface of the through tube is in contact with the lower surface of the automobile chassis metal part.

[0014] In any of the above technical solutions, the third punching head includes a bearing seat, the punching rod penetrates the bearing seat longitudinally and is fixed on the bearing seat; the temperature control structure includes a conveying hose, and the conveying hose is connected to the guide hole; an assembly hole connected to the moving end of the punching machine is opened on the end of the upper surface of the bearing seat away from the punching rod.

[0015] In any of the above technical solutions, the first punching head is longitudinally provided with a through hole for the bearing seat and the punching rod to move, and a limiting platform corresponding to the longitudinal direction of the assembly hole is formed in the middle of the through hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By establishing a connected and sustainably adjustable temperature control structure and temperature control flow channel between the stamping upper die and the stamping lower die, the present invention effectively transports the refrigerant to key parts of the stamping die cavity, so that the first temperature value and the second temperature value are both in a preset temperature range, which not only improves the overall thermal balance of the stamping upper die and the stamping lower die, avoiding material deformation and rebound caused by local overheating or overcooling, but also further ensures the dimensional accuracy and yield rate of automobile chassis metal parts in mass production; at the same time, through integrated temperature management, it can also delay the fatigue and wear of the mold in the high-frequency stamping process, significantly extend the life of the mold, and comprehensively improve the stamping process efficiency, product quality and production stability.

[0018] Additional aspects and advantages of embodiments according to the present invention will become apparent in the following description or may be learned through practice of embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the stamping lower die and its connection structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the stamping upper die and its connection structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the first punch head and its connection structure of the present invention;

[0024] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 It is a schematic diagram of the third punch head and its connection structure of the present invention;

[0026] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0027] Figure 8 It is a bottom view of the stamping lower die of the present invention.

[0028] in, Figure 1-Figure 8 The corresponding relationship between the reference numerals and the component names is as follows:

[0029] 1 stamping upper die, 101 first stamping head, 1011 through hole, 1012 limiting platform, 1013 hydraulic cylinder, 102 second stamping head, 103 third stamping head, 1031 punching rod, 1032 bearing seat, 1033 assembly hole, 1034 waist, 104 stamping die, 105 accommodating cavity, 2 stamping lower die, 201 stamping punch, 2011 jack, 202 through pipe, 203 discharge window, 3 automobile chassis metal parts, 4 conveying hose, 5 refrigerant cavity, 6 partition, 7 temperature control hole, 8 waste box. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0032] See also Figure 1-Figure 8 , the following describes a die for trimming and punching automobile chassis metal parts according to some embodiments of the present invention.

[0033] The embodiment of the first aspect of the present invention provides a die for trimming and punching metal parts of automobile chassis. In some embodiments of the present invention, such as Figure 1-Figure 8 As shown, the mold includes a stamping upper die 1 fixed to the moving end of the stamping machine and a stamping lower die 2 fixed to the stamping machine, and a stamping die cavity for forming a metal part 3 of an automobile chassis is formed between the stamping upper die 1 and the stamping lower die 2.

[0034] The stamping upper die 1 includes a multi-stage punching head to process the material strip passing through the stamping machine step by step into a metal part 3 for the automobile chassis; the stamping upper die 1 also includes a temperature control structure for conveying a refrigerant, and the temperature control structure is used to cooperate with the multi-stage punching head to avoid the interference of the temperature control structure with the mold closing, so that when the stamping upper die 1 and the stamping lower die 2 continue to process the material strip, the first temperature value of the stamping die cavity is adjusted to be within a preset temperature range. The temperature of the stamping die cavity is controlled as a whole through the temperature control structure, so that the stamping upper die 1 and the stamping lower die 2 can be integrated with the temperature control of the processing part.

[0035] A temperature control channel for conveying refrigerant is formed on the stamping lower die 2; when the stamping upper die 1 and the stamping lower die 2 are closed, the temperature control channel is connected to the temperature control structure to adjust the second temperature value of the automobile chassis metal part 3 to be within a preset temperature range. The second temperature value can be adjusted when the automobile chassis metal part 3 is being shaped to avoid processing errors caused by cooling.

[0036] The present invention provides a die for trimming and punching metal parts 3 of automobile chassis, including a stamping upper die 1 fixed to the moving end of the stamping machine and a stamping lower die 2 fixed to the stamping machine. When the stamping machine reciprocates, the stamping upper die 1 moves with it and forms a close fit with the stamping lower die 2. The stamping die cavity formed between the two can gradually stamp and form the material strip. The stamping upper die 1 fixed to the moving end of the stamping machine is set in a movable position because it can follow the stroke of the stamping machine to complete multiple pressing, trimming and punching operations on the material strip, so that the material strip can obtain higher processing efficiency and accuracy during continuous transportation; and the stamping lower die 2 fixed to the stamping machine provides a stable support surface and positioning reference, so that each stamping can maintain the same reference position, so as to reduce processing errors and ensure the consistency of dimensions of mass-produced parts. The stamping die cavity formed between the stamping upper die 1 and the stamping lower die 2 is the core forming area for realizing the automobile chassis metal part 3. By setting a contour surface or matching surface that meets the appearance requirements of the automobile chassis metal part 3 inside the die cavity, the material strip can be subjected to the precise action of multi-level stamping pressure after the mold is closed, thereby completing the partial or overall deformation of the automobile chassis metal part 3.

[0037] A multi-stage punch head is arranged inside the stamping upper die 1. The function of these punch heads is to process the material strip step by step. For example, the local area is preliminarily formed or pre-punched first, and then the trimming, fine punching and other operations are completed in the subsequent workstations. The production is promoted in sequence by the multi-stage punch heads, which can significantly improve the stamping efficiency and reduce the need for repeated positioning of the material strip. The multi-stage punch heads need to maintain a corresponding spatial arrangement with each other, so that the material strip can be accurately delivered to the corresponding workstation after each transfer or positioning. In order to cope with the fast and high-frequency stamping rhythm, the stamping upper die 1 is also equipped with a temperature control structure for conveying refrigerant. The function of the temperature control structure is to cool or thermostatically regulate the multi-stage punch heads and their surrounding areas, thereby reducing the adverse effects of the large amount of heat generated by high-speed stamping on the deformation of the mold and the material strip. The temperature control structure cooperates with the multi-stage punching head. Without hindering the mold closing movement, it can surround the key parts in the form of suitable pipes or flow channels, and use refrigerant to take away excess heat, so as to achieve overall temperature management of the stamping upper mold 1, so that the stamping die cavity can still maintain the first temperature value in the preset temperature range during the high-speed working stage.

[0038] At the same time, a temperature control channel for conveying a refrigerant is formed on the stamping lower die 2. When the stamping upper die 1 and the stamping lower die 2 are closed, the temperature control channel can be connected to the temperature control structure of the stamping upper die 1, thereby achieving uniform and efficient temperature control in the closed space of the mold cavity. Through this path, the refrigerant can not only circulate inside the stamping upper die 1, but also flow smoothly to the working surface or inside of the stamping lower die 2, thereby stabilizing the first temperature value and the second temperature value of the entire mold within the required range. Compared with the defect of the prior art that independent cooling circuits are set for the upper die and the lower die respectively, which makes it difficult to unify the thermal balance of the mold, the interconnected temperature control structure of the present invention can ensure that the upper and lower dies always maintain a relatively consistent thermal distribution state, greatly reducing the area of ​​local overheating or overcooling, thereby effectively reducing the rebound error of the automobile chassis metal parts 3 during high-speed stamping. When the automobile chassis metal parts 3 are being shaped, if a more precise adjustment of the second temperature value is required, the temperature control flow channel can automatically or semi-automatically adjust the refrigerant flow rate and the refrigerant temperature according to the real-time monitoring data, so that the automobile chassis metal parts 3 can obtain just the right temperature control at important forming parts, avoiding adverse changes in material strength, ductility or dimensional deformation characteristics due to excessive cooling, thereby reducing processing errors and improving product quality to a certain extent.

[0039] In general, the temperature of the stamping die cavity is controlled as a whole through the temperature control structure, which can not only keep the first temperature value in the area where the multi-stage punch head is located in an appropriate range, but also keep the second temperature value in the preset range when the stamping lower die 2 is extruding or supporting. During the reciprocating motion of the high-speed stamping machine, the temperature can be managed in an integrated manner, whether it is the stamping upper die 1 side that performs preliminary shaping of the material strip, or the stamping lower die 2 side that completes the load and shaping; in this way, the problem of excessive temperature deviation caused by relying solely on cooling the upper die or the lower die can be overcome, and the degree of rebound of the automobile chassis metal parts 3 can be finely controlled, thereby improving the overall dimensional stability and yield rate of the parts. By establishing a connected refrigerant delivery structure between the stamping upper die 1 and the stamping lower die 2, the deficiency of the prior art that it is difficult to achieve overall temperature uniformity of the mold due to independent cooling of the upper and lower dies is solved, and a more optimized thermal management environment is provided for the trimming, punching and subsequent shaping of the automobile chassis metal parts 3.

[0040] After the mold is closed, the automobile chassis metal parts 3 are moderately cooled and a stable temperature field is maintained, so that the internal heat of the metal material can be taken away in time or maintained at a relatively balanced level after the metal material is in the plastic deformation stage, so that the area that has been punched or formed can be more quickly shaped and the tissue stress can be reduced, thereby effectively suppressing the deformation rebound caused by excessive temperature gradient. The benefit of doing so is not only that the automobile chassis metal parts 3 can maintain higher dimensional stability after the external force is released, reducing the time and cost required for subsequent correction processes, but also ensuring that the automobile chassis metal parts 3 are more closely matched with other components during assembly, further improving the overall safety performance and driving smoothness of the vehicle. In addition, by suppressing the deformation difference caused by excessive rebound, the defective rate and scrap rate in mass production can be significantly reduced, so that the production line can maintain a higher efficiency, thereby achieving better economic benefits while ensuring the strength and precision of the parts.

[0041] In any of the above embodiments, the multi-stage punching head includes a first punching head 101, a second punching head 102 and a third punching head 103 which are independent of each other, so as to perform pressing, trimming and punching on the material strip successively.

[0042] The third punch head 103 is connected to the temperature control structure to deliver cooling medium after punching, so that the temperature control structure can move with the third punch head 103 and perform continuous overall cooling between the repeated opening and closing of the stamping upper die 1 and the stamping lower die 2.

[0043] In this embodiment, the function of the first punch head 101 is press forming, which is mainly responsible for shaping a specific area on the material strip into the expected structural shape of the automobile chassis. At this stage, the first punch head 101 processes the preset part on the material strip into a three-dimensional form that meets the design requirements. This process is the basis of the entire stamping operation and ensures that the basic shape and size of the finished part are accurately achieved.

[0044] After the first punch head 101 forms the parts, the second punch head 102 performs the trimming operation. Its main task is to completely cut the formed chassis parts from the material strip and complete the physical separation of the formed parts. This step is the separation link in the stamping process, which ensures that the formed parts can be accurately separated from the raw materials, providing independent parts for subsequent punching or other processing steps.

[0045] Finally, the third punch head 103 is responsible for punching. This step is performed in the mold-closing state, and is mainly used to punch out the required holes in the trimmed chassis metal parts according to the predetermined position and size. Punching is the final establishment of the functionality of the chassis parts. The precise hole position is crucial for assembly and subsequent applications. Highly precise operations are required to ensure that the position, size and quality of the hole meet the design specifications.

[0046] The temperature control structure is designed to follow the movement of the third punch head 103, ensuring that the coolant is delivered through the punch head after each punching operation, and local cooling is carried out in time to allow the temperature of the heated area to be dynamically adjusted during the punching operation to prevent deformation or other quality problems caused by thermal stress. In addition, through the coordinated work of the temperature control structure, continuous and uniform overall cooling can be carried out during the repeated opening and closing of the stamping upper die 1 and the stamping lower die 2, maintaining the thermal balance of the entire mold, thereby avoiding the rebound of the metal material caused by the large temperature difference, and ensuring the dimensional stability and quality consistency of the parts.

[0047] In any of the above embodiments, the stamping lower die 2 includes at least one stamping punch 201 , and the bottom of the first stamping head 101 is equipped with a stamping die 104 matched with the stamping punch 201 .

[0048] When the stamping upper die 1 and the stamping lower die 2 are closed, the third punch head 103 penetrates the automobile chassis metal part 3 and the stamping concave die 104. The refrigerant transported by the temperature control structure is transported from the stamping upper die 1 to the stamping lower die 2, thereby improving the integrated temperature control.

[0049] In this embodiment, the stamping lower die 2 includes at least one stamping punch 201, and a stamping die 104 adapted to the stamping punch 201 is assembled at the bottom of the first punch head 101; when the punching machine is working, a closed stamping die cavity is formed between the stamping upper die 1 and the stamping lower die 2, which is used to perform multiple forming operations on the automobile chassis metal parts 3. Based on this arrangement, the first punch head 101 can be closely matched with the stamping punch 201 during the mold closing process to achieve plastic deformation or preliminary shaping of a certain area in the material strip. At the same time, the mutual engagement characteristics of the stamping die 104 and the stamping punch 201 can provide more stable positioning and support for the subsequent trimming or punching process, ensuring that the automobile chassis metal parts 3 will not be accidentally displaced when subjected to the punching force, thereby further ensuring the shape and size of the finished product.

[0050] It is worth noting that when the stamping upper die 1 and the stamping lower die 2 are closed, the third punch head 103 will penetrate the automobile chassis metal parts 3 and the stamping concave die 104. Through this penetration action, the temperature control structure connected to the third punch head 103 can transport the refrigerant from the stamping upper die 1 all the way to the stamping lower die 2, thereby forming a continuous refrigerant transfer channel inside the closed stamping die cavity. In other words, the third punch head 103 not only undertakes the last stamping process (such as punching or local trimming), but also acts as a bridge for refrigerant transportation, allowing the refrigerant to flow stably between the upper and lower parts of the stamping die. Since the refrigerant continuously takes away or adjusts the heat of the metal parts and the mold surface during this process, it can effectively alleviate the material rebound or stress concentration problems caused by excessive local temperature, and achieve the goal of integrated temperature control.

[0051] In this series of operations, the mutual matching between the first punch head 101 and the punch 201 ensures the accuracy and stability of the initial forming stage; the penetration of the third punch head 103 can not only complete the final stamping operation, but also enable the temperature control structure to play a wider range of roles. By "guiding" the refrigerant from the stamping upper die 1 to the stamping lower die 2, each processing part on the mold can obtain relatively balanced temperature management during the same mold closing cycle. The upper and lower molds are no longer independent cooling modules that work independently, but are integrated into the same temperature control circulation system, so as to better maintain the thermal balance in the mold cavity during the stamping process. For automobile chassis metal parts 3, this upper and lower linkage temperature control method helps to quickly suppress the deformation rebound caused by the release of thermal stress after the mold closing is completed, so that the workpiece that has been formed or trimmed can maintain accurate geometric appearance and size after demolding.

[0052] Furthermore, since the refrigerant forms a closed loop between the stamping upper die 1 and the stamping lower die 2, the temperature of each area inside the mold can be monitored and adjusted in real time by the temperature control structure during high-speed stamping or long-term continuous work. In this way, not only can the service life of the mold as a whole be extended, but also the dimensional deviation and defective rate caused by mold overheating or insufficient local cooling in mass production can be greatly reduced. Especially in the demanding automobile chassis processing scenario, maintaining the high stability of the automobile chassis metal parts 3 after processing is of key significance for subsequent assembly and vehicle safety. On the whole, the matching relationship formed by the first punch head 101 and the punch 201, the penetration of the third punch head 103 into the punch die 104, and the upper and lower through-conveying of the temperature control structure together constitute an overall solution with both high-precision molding and high-efficiency heat dissipation, which fundamentally solves the shortcomings of the prior art in temperature management and rebound control.

[0053] In any of the above embodiments, the third punching head 103 includes a punching rod 1031, and the punching rod 1031 is provided with a guide hole along the longitudinal direction; when the stamping upper die 1 and the stamping lower die 2 are closed, the guide hole is used to connect the temperature control structure and the temperature control flow channel; when the stamping upper die 1 and the stamping lower die 2 are opened, the guide hole is used to connect the temperature control structure and the stamping die cavity, so as to continuously perform temperature control under different states of the mold.

[0054] In this embodiment, the third punch head 103 has a punch rod 1031 that is arranged in the longitudinal direction, and a guide hole is provided in the punch rod 1031. The guide hole is interconnected with the temperature control structure, the temperature control channel or the stamping die cavity under different working conditions of the mold, so as to realize continuous and efficient temperature control of various parts inside the mold. Specifically, when the stamping upper mold 1 and the stamping lower mold 2 are in the mold closing state, the guide hole will be connected with the temperature control channel inside the stamping lower mold 2 through the third punch head 103, so that the refrigerant transported by the temperature control structure can directly enter the corresponding area of ​​the stamping lower mold 2; when the stamping upper mold 1 and the stamping lower mold 2 are in the mold opening state, the guide hole will be connected with the stamping die cavity, so that the temperature control structure can introduce the refrigerant or other cooling medium into the die cavity, thereby quickly cooling or adjusting the temperature of the stamping processing surface that has been completed or is about to be performed.

[0055] Based on the above settings, the third punch head 103 not only performs the punching operation, but also assumes the function of the refrigerant transmission channel. By organically combining the built-in guide hole of the punching rod 1031 with the temperature control structure, the temperature control flow channel and the stamping die cavity, the heat can be continuously transferred or dissipated in the entire stamping cycle (from mold closing to mold opening, and then to the next mold closing), which greatly improves the overall temperature balance of the mold. On the one hand, when the stamping upper die 1 and the stamping lower die 2 are tightly fitted, the refrigerant can reach the contact part of the mold and the key forming area of ​​the automobile chassis metal part 3 more deeply, minimizing the material rebound and stress concentration caused by high temperature or high pressure; on the other hand, when the stamping upper die 1 and the stamping lower die 2 are separated, the guide hole can keep the temperature control structure and the stamping die cavity interconnected, and timely take away the excess heat inside the processing surface and the stamping die cavity, avoiding deformation or quality defects caused by local overheating.

[0056] Through this coordinated cooling and temperature management method, the third punch head 103 not only realizes the punching requirements for the automobile chassis metal parts 3, but also ensures the free flow of the refrigerant between the stamping upper die 1 and the stamping lower die 2, as well as the stamping die cavity and the temperature control flow channel in the mold during the entire cycle of mold closing and mold opening. Compared with the traditional stamping mold with separate cooling, the guide hole function of the third punch head 103 in the present invention greatly enhances the thermal management effect of the entire mold, fundamentally reduces the product size deviation and subsequent correction cost caused by temperature imbalance, and significantly improves the production efficiency and finished product stability under mass production conditions, providing a solid technical guarantee for the high-quality and high-precision stamping processing of automobile chassis metal parts 3.

[0057] Furthermore, a waist 1034 is formed in the middle of the punching rod 1031 so that the guide hole has a gradually narrowing cross-section from top to bottom, which is beneficial to the accelerated flow of the refrigerant, and the refrigerant is a gaseous medium.

[0058] As can be seen from the above, the small flow area accelerates the flow speed of the gaseous refrigerant. When the refrigerant flows from the upper part to the lower part of the punching rod 1031, its flow speed will be accelerated due to the narrowing of the channel through the waist 1034 area, thereby increasing the kinetic energy of the refrigerant and making the cooling efficiency higher.

[0059] The design of the guide hole also reflects the characteristic of gradual narrowing, which is coordinated with the structure of the waist 1034. This narrowing not only promotes the acceleration of the refrigerant, but also helps to increase the contact area between the refrigerant and the inner wall of the punching rod 1031, thereby improving the heat exchange efficiency. This is because as the channel gradually narrows, the relative friction between the refrigerant and the channel wall increases, which helps the coldness of the refrigerant to be transferred to the metal wall faster, thereby more effectively taking away heat from the heated part of the punching rod 1031.

[0060] The coolant inside the punching rod 1031 is a gaseous medium, and the compressibility and fluidity of the gas make the design of the waist 1034 particularly suitable. When the gaseous coolant passes through the narrowed channel, the increase in its flow rate will lead to an increase in dynamic pressure, which helps the gaseous coolant to more quickly transfer the cooling effect to key areas inside the mold, especially in high-temperature areas or areas that need to be cooled quickly after stamping.

[0061] In any of the above embodiments, a socket 2011 is provided in the middle of the top of the punching punch 201. When the temperature control structure and the temperature control flow channel are connected, the socket 2011 accommodates part of the punching rod 1031 to allow the waste to fall out after punching and the refrigerant to be transported together.

[0062] In this embodiment, a plug hole 2011 is provided in the middle of the top of the punching punch 201. When the temperature control structure and the temperature control flow channel are in a connected state, the plug hole 2011 can accommodate part of the punching rod 1031 in the third punch head 103, so as to allow the waste to fall out smoothly through the plug hole 2011 after the punching operation is completed, and the cooling process can be smoothly carried out in cooperation with the delivery of the refrigerant in the same channel. Specifically, after the automobile chassis metal part 3 has undergone press forming and trimming, the third punch head 103 will perform a punching operation on the automobile chassis metal part 3 in the mold closing state, and the punching rod 1031 penetrates the automobile chassis metal part 3 from top to bottom and extends to the corresponding punching position of the punching die 104. At this time, the plug hole 2011 in the middle of the top of the punching punch 201 reserves part of the space for the punching rod 1031, so that it can form a discharge and refrigerant flow path from the mold cavity to the temperature control flow channel after the punching is completed.

[0063] In this path, firstly, the waste will fall down along the channel outside the punching rod 1031 or the gap between the punching rod 1031, and be discharged to the bottom of the mold or the designated collection area, thereby avoiding the mold blockage or jamming caused by the accumulation of waste. Secondly, the refrigerant can also form an effective flow circuit around the same socket 2011 and the punching rod 1031, and be transferred from the temperature control structure of the stamping upper mold 1 to the temperature control flow channel of the stamping lower mold 2, and in the process, the high-temperature area close to the surface of the stamping punch 201 and the automobile chassis metal part 3 is cooled. Since the socket 2011 is located exactly in the middle of the stamping punch 201, this means that the refrigerant can directly act on the center part of the mold where the contact is the closest and the temperature is most likely to rise, so that the heat in the key area of ​​the mold can be taken away faster, reducing the rebound, deformation or stress concentration problems caused by uneven temperature.

[0064] Furthermore, when the stamping upper die 1 and the stamping lower die 2 are separated in the open die state, the channel formed by the guide hole and the punching rod 1031 enables the temperature control structure to maintain interconnection with the stamping die cavity, which means that when the punching is just completed and the automobile chassis metal part 3 has not yet left the die cavity, the die contact surface and the surface of the finished part can be continuously and evenly cooled. In this way, the entire stamping cycle - including the various stages of pressing and forming, trimming, punching, opening and closing the die - is in a coherent cooling circuit, and the upper and lower dies are no longer fighting each other, but the integrated temperature management is achieved through the connection of the jack 2011, the punching rod 1031, the temperature control structure and the temperature control flow channel.

[0065] In summary, the feature of the insertion hole 2011 in the middle of the top of the punch 201 cooperates with the punch rod 1031 of the third punch head 103, so that the waste discharge and the refrigerant delivery can be smoothly carried out in the same passage, avoiding the interference of waste accumulation on the mold operation, and also enhancing the thermal management efficiency during the stamping process. Relying on this design, the mold can still maintain a relatively balanced overall temperature distribution when working under high speed or high temperature conditions, thereby improving the molding accuracy and production efficiency.

[0066] In any of the above embodiments, the temperature control channel includes:

[0067] Multiple refrigerant cavities 5 are formed by dividing the refrigerant cavities 5 through partitions 6 arranged inside the stamping lower die 2. The bottom of the partition 6 is higher than the bottom of the stamping lower die 2 so that the bottoms of all refrigerant cavities 5 are connected; at least one refrigerant cavity 5 is connected to the socket 2011.

[0068] The temperature control hole 7 is longitudinally opened on the upper surface of the stamping lower die 2, and the temperature control hole 7 is connected to the refrigerant cavity 5; the circumferential edge of the automobile chassis metal part 3 is an extended edge, and the temperature control hole 7 corresponds to the extended edge in the longitudinal direction.

[0069] In this embodiment, the temperature control flow channel is composed of a plurality of refrigerant cavities 5 and temperature control holes 7. First, a plurality of refrigerant cavities 5 are divided and formed by partitions 6 arranged inside the stamping lower die 2. The bottom positions of these partitions 6 are higher than the bottom of the stamping lower die 2, so that each refrigerant cavity 5 is separated by the partitions 6 in the horizontal direction, but is connected to each other in the depth direction or the bottom, and finally realizes the through flow of refrigerant at the bottom of all refrigerant cavities 5. In other words, when the refrigerant enters one of the refrigerant cavities 5, it does not need to detour on the surface, and can smoothly flow through other refrigerant cavities 5 along the bottom that is interconnected, thereby forming a circulation channel inside the stamping lower die 2. The function of this design is: on the one hand, it makes full use of the internal space of the stamping lower die 2 for refrigerant arrangement, thereby improving the overall cooling efficiency of the lower die; on the other hand, the partitions 6 effectively divide different refrigerant cavities 5, and can perform relatively independent temperature management or flow control on different areas when necessary, thereby taking into account flexibility and efficiency.

[0070] Secondly, at least one refrigerant cavity 5 is connected to the jack 2011. When the third punch head 103 completes the punching operation on the automobile chassis metal part 3, the jack 2011 will form a longitudinal channel with the punch rod 1031 and the punching die 104, so that the refrigerant can enter or flow out of the surface of the stamping lower die 2 and its internal structure area in the mold closing or mold opening state. Since at least one refrigerant cavity 5 is directly connected to the jack 2011, it means that after the refrigerant enters the jack 2011 from the stamping upper die 1 through the punch rod 1031, it can continue to flow into or flow back to the refrigerant cavity 5 along the jack 2011, and then diffuse to other refrigerant cavities 5 along the bottom channel reserved between the partitions 6. It can be seen that a continuous refrigerant circulation path is formed between "plug 2011-refrigerant cavity 5-punching rod 1031-temperature control structure", and the refrigerant can continue to flow and take away heat during the process of closing or opening the upper and lower molds, which not only avoids the deformation of the automobile chassis metal parts 3 caused by local high temperature, but also greatly reduces the heat dissipation pressure of the mold during high-load stamping.

[0071] Matching the multiple refrigerant cavities 5 is a temperature control hole 7, which is longitudinally opened on the upper surface of the stamping lower die 2 and is connected to the refrigerant cavity 5. According to the description of this embodiment, when the circumferential edge (i.e., the extended edge) of the automobile chassis metal part 3 needs to be focused on or cooled in the longitudinal direction, the temperature control hole 7 can be arranged corresponding to the extended edge. Its specific function is that the temperature control hole 7 can directly guide the refrigerant to the circumferential edge of the automobile chassis metal part 3 that is easily heated or deformed, and provide targeted temperature regulation here. If the area is prone to overheating or local stress concentration due to friction, plastic deformation or ambient temperature changes under high-speed stamping or high frequency of mold closing, the refrigerant is accurately transported to the extended edge through the temperature control hole 7, which can take away the residual heat and maintain the temperature balance of the part in the first time. This not only helps to reduce the risk of rebound or warping of the edge of the automobile chassis metal part 3, but also ensures the dimensional matching degree when assembling with other parts after trimming.

[0072] In any of the above embodiments, the stamping lower die 2 is provided with a discharge window 203 in the transverse direction, and the discharge window 203 is used to accommodate the waste material after the third punching head 103 performs punching, and the inner cavity of the discharge window 203 communicates with the insertion hole 2011 and the refrigerant cavity 5. A waste box 8 is slidably installed inside the discharge window 203, and the outer port of the discharge window 203 is openable and closable.

[0073] In this embodiment, the stamping lower die 2 is provided with a discharge window 203 in the transverse direction, and the discharge window 203 plays a dual role of waste discharge and auxiliary cold medium transmission channel during the entire stamping operation. Specifically, when the third punch head 103 performs the punching operation, the waste on the automobile chassis metal part 3 will fall off along the through path of the punching rod 1031 to the internal space of the discharge window 203, thereby preventing the waste from remaining near the stamping die cavity or the temperature control flow channel, and avoiding jamming or mold damage caused by waste accumulation. The inner cavity of the discharge window 203 is connected with the socket 2011 and the refrigerant cavity 5, so that the discharge of waste and the transportation of refrigerant can cooperate with each other in the same area: on the one hand, the waste can rely on the inner cavity of the discharge window 203 to directly slide down and be collected in the waste box 8 described later; on the other hand, the refrigerant can also form a coherent flow near the discharge window 203 with the help of the socket 2011 and the refrigerant cavity 5, thereby taking away excess heat around the lower mold or the location of the third punch head 103.

[0074] It is worth noting that, in order to facilitate the recycling and treatment of waste materials, a waste box 8 is slidably installed inside the discharge window 203, and the waste box 8 can be pulled out or pushed back into the inner cavity of the discharge window 203 at any time, so as to achieve rapid disassembly and cleaning. After the third punch head 103 punches through the automobile chassis metal parts 3 during the die closing process, the waste will directly fall into the waste box 8, and the operator or the automated manipulator can take out the waste box 8 along the lateral direction of the discharge window 203 during the gap time, and clean up the collected waste uniformly to ensure the smoothness of the subsequent punching process. At the same time, the sliding installation mode of the waste box 8 inside the discharge window 203 can also minimize the interference of the waste on the flow of the refrigerant when it is discharged, and maintain the connectivity between the discharge window 203 and the jack 2011 and the refrigerant cavity 5, so that the whole temperature control process can still maintain a stable heat dissipation efficiency in a high-speed operation environment.

[0075] At the outer port of the discharge window 203, an openable and closable structure is provided to seal the discharge window 203 when the waste discharge operation is not being performed, thereby preventing dust or impurities from the external environment from entering the internal area of ​​the stamping lower die 2, and also avoiding unnecessary leakage or excessive loss of refrigerant at the discharge window 203. When it is necessary to clean the waste box 8 or to perform maintenance on the discharge window 203, the inside of the discharge window 203 can be quickly accessed by opening the outer port to remove and inspect the waste box 8. Through this freely openable and closable outer port setting, the adaptability of the discharge window 203 in the daily production process is further improved, thereby taking into account the balance between effective discharge during the stamping process and keeping the inside of the lower die clean.

[0076] In general, the discharge window 203 and the slidably mounted waste box 8 form a highly coupled functional system with the socket 2011 and the refrigerant cavity 5: after the third punch head 103 completes the punching, the metal waste can be discharged in time and collected in the waste box 8, avoiding interference with other parts of the mold or blocking the temperature control flow channel; at the same time, the connection between the discharge window 203 and the socket 2011 and the refrigerant cavity 5 can form a more complete and faster heat dissipation channel for the refrigerant in the lower mold area, ensuring that the mold can achieve temperature management of key parts and processing surfaces in different states such as mold closing and mold opening. From rebound suppression to dimensional accuracy control, this series of structures cooperate with each other, so that the automobile chassis metal parts 3 can obtain more uniform and stable heat distribution during trimming, punching and subsequent forming processes, thereby greatly reducing the risk of material deformation caused by excessive temperature difference and improving the overall quality and production efficiency of parts.

[0077] In any of the above embodiments, a through pipe 202 is installed on the inner wall of the socket 2011. The through pipe 202 is a hollow porous structure, which can reverse the refrigerant discharged from the bottom of the punching rod 1031 through the internal porous structure to contact the surrounding area of ​​the lower surface of the automobile chassis metal part 3 that has just been punched; the inner wall of the through pipe 202 is adapted to the side wall of the punching rod 1031.

[0078] When the automobile chassis metal part 3 is in contact with the upper surface of the punch 201 , the upper surface of the through pipe 202 is in contact with the lower surface of the automobile chassis metal part 3 .

[0079] In this embodiment, a through pipe 202 is installed on the inner wall of the plug hole 2011. The through pipe 202 adopts a hollow and porous structure, which is intended to enable the refrigerant discharged from the bottom of the third punch head 103 to achieve "reverse" reflux, so as to directly contact the surrounding parts of the lower surface of the automobile chassis metal part 3 that has just completed the punching operation from bottom to top. Such a structural design can not only provide more concentrated and effective cooling for high-temperature or high-stress areas, but also ensure that the refrigerant continues to pass upward along the inside of the through pipe 202 after cooling the stamping lower die 2 and the waste channel, and reaches the key processing area at the punching location.

[0080] The inner wall of the through-tube 202 is matched with the side wall of the punching rod 1031, which means that when the stamping die is closed and the third punch head 103 performs punching or cooling, the through-tube 202 and the punching rod 1031 can be closely fitted or maintain an appropriate gap in the circumferential direction, so that the refrigerant can flow smoothly inside the hollow and porous through-tube 202. At the same time, this matching relationship also ensures that during the opening and closing process of the stamping upper die 1 and the stamping lower die 2, the through-tube 202 will not deviate or excessively rub against the punching rod 1031, thereby maintaining the stability of the refrigerant transportation and the integrity of the channel.

[0081] Specifically, after the third punch head 103 penetrates downward through the automobile chassis metal part 3 and forms a punching channel with the punching punch 201, the refrigerant can flow downward through the bottom of the punching rod 1031 and the plug hole 2011 area driven by gravity or pressure difference, and then the refrigerant is reversely directed to the lower surface of the automobile chassis metal part 3 by using the hollow porous structure of the through pipe 202. In this way, just after the punching operation is completed, the high temperature or easily deformed area of ​​the metal material can be immediately cooled and intervened in time to avoid rebound after stamping, local deformation and even material fatigue due to temperature concentration or excessive residual stress. Since the pore distribution in the through pipe 202 can be optimized according to actual needs, the refrigerant can not only flow along the central channel, but also spray or guide the refrigerant to a wider surface area through multiple holes distributed on the wall of the through pipe 202, so that the cooling range is wider and the effect is more uniform.

[0082] When the automobile chassis metal part 3 fits the upper surface of the punch 201, the upper surface of the through pipe 202 also fits tightly with the lower surface of the automobile chassis metal part 3, so that a relatively closed and controllable cooling zone is formed between the through pipe 202 and the automobile chassis metal part 3. At this time, the refrigerant can fully contact the automobile chassis metal part 3 in this fitting space, quickly take away the excess heat generated by stamping or punching, and flow back to the inside of the jack 2011 or the punching rod 1031 through the pores of the through pipe 202 when necessary, forming a circulating cooling circuit. In this way, whether it is the strong extrusion in the mold closing stage or the rapid cooling after the punching, it can be carried out smoothly and efficiently with the help of the through pipe 202.

[0083] Specifically, the through pipe 202 may be a metal sintered body, a honeycomb metal structure, a reinforced porous ceramic such as aluminum oxide ceramic and silicon carbide ceramic, or a corrugated metal pipe.

[0084] In any of the above embodiments, the third punching head 103 includes a supporting seat 1032, and the punching rod 1031 penetrates the supporting seat 1032 in the longitudinal direction and is fixed on the supporting seat 1032. The supporting seat 1032 executes the punching force transmission of the punching rod 1031 and the refrigerant transmission node of the temperature control structure.

[0085] The temperature control structure includes a delivery hose 4, and the delivery hose 4 is connected to the guide hole.

[0086] An assembly hole 1033 connected to the moving end of the punching machine is formed on one end of the upper surface of the bearing seat 1032 away from the punching rod 1031 , and the assembly hole 1033 is connected to the hydraulic rod on the moving end of the punching machine.

[0087] In this embodiment, the structure of the third punch head 103 includes a bearing seat 1032, and the punching rod 1031 passes through the bearing seat 1032 in the longitudinal direction and is fixed on the bearing seat 1032. Through this fixing method, the third punch head 103 can more stably withstand the force from the moving end of the punching machine during the punching process, and accurately transmit it to the punching rod 1031, so that the punching rod 1031 performs high-precision punching or local deformation operations on the automobile chassis metal parts 3. At the same time, the bearing seat 1032 not only plays the role of transmitting mechanical force, but also serves as a key node for the flow of refrigerant in the temperature control structure of this embodiment: during the up and down movement of the third punch head 103, the flow channel, interface and delivery hose 4 arranged inside or around the bearing seat 1032 can continuously and stably deliver the refrigerant to the guide hole inside the punching rod 1031, thereby ensuring continuous cooling or heat preservation of the punching part at different stages of mold closing and mold opening.

[0088] The temperature control structure includes one or more delivery hoses 4, which are connected to the guide holes of the punching rod 1031 and are responsible for delivering the refrigerant from the external refrigerant source to the bearing seat 1032 or the inside of the punching rod 1031. Since the delivery hose 4 has good flexibility and high temperature resistance, when the bearing seat 1032 moves up and down with the moving end of the punching machine, the hose can bend or shake without leakage or breakage, thereby maintaining the integrity of the refrigerant delivery process. After the refrigerant enters the guide hole through the hose, it can flow downward along the longitudinal path of the punching rod 1031 and reach the components such as the jack 2011 or the through pipe 202 that cooperate with the lower die, so as to achieve targeted cooling of the local area of ​​the automobile chassis metal part 3; in this process, the bearing seat 1032 plays the role of a "transfer station", which not only meets the requirements of punching force transmission in terms of mechanical bearing, but also effectively integrates the delivery nodes of the temperature control structure, and minimizes the complexity of the refrigerant delivery pipeline.

[0089] In order to better fix the third punch head 103 on the moving end of the punching machine, an assembly hole 1033 is provided on the upper surface of the bearing seat 1032 at the end away from the punching rod 1031, and the assembly hole 1033 is connected to the hydraulic rod or similar power element on the moving end of the punching machine. In this way, when the punching machine starts the mold closing or mold opening action, the hydraulic rod will drive the bearing seat 1032 and the punching rod 1031 thereon to move as a whole through the assembly hole 1033, directly realizing the precise positioning of the punching position of the material strip or the automobile chassis metal part 3; in the high-frequency stamping operation, the bearing seat 1032 must not only withstand and transmit strong pressure, but also ensure that the refrigerant flows undisturbed in the channel inside the third punch head 103, so the connection method between the bearing seat 1032 and the hydraulic rod is crucial. On the one hand, it needs to be strong enough not to be deformed or loosened due to strong vibration or impact force; on the other hand, it must also allow a small amount of fine-tuning during design to avoid pulling or squeezing the delivery hose 4 or the diversion hole, thereby ensuring the integrity and efficiency of the temperature control structure. Specifically, the cross-section of the support seat 1032 is an elliptical eccentric structure to reduce the interference of the punching rod 1031 with the refrigerant delivery and the structural damage to the delivery hose 4 when the punching force is transmitted.

[0090] To sum up, the third punching head 103 includes a bearing seat 1032, a punching rod 1031, and a conveying hose 4 and a guide hole in the temperature control structure, which form a close and efficient cooperative relationship with each other: the bearing seat 1032 completes the transmission of mechanical punching force on the one hand, and integrates the conveying hose 4 and the guide hole as a refrigerant transmission node on the other hand; the punching rod 1031 penetrates the bearing seat 1032 longitudinally, so that the punching, refrigerant delivery and mechanical support functions of the bearing seat 1032 are integrated into one; the connection between the assembly hole 1033 and the hydraulic rod further ensures that the third punching head 103 maintains precise positioning and movement trajectory throughout the stamping process, thereby providing a strong guarantee for the forming quality and dimensional accuracy of the automobile chassis metal parts 3. Through such an overall design, the present invention effectively solves the problem that the upper and lower molds cannot coordinate the temperature control of the traditional molds with independent cooling, so that in high-speed mold closing or long-term operation environment, it is still possible to achieve efficient management of the mold and workpiece temperature, significantly reducing the rebound, deformation and post-processing errors caused by thermal imbalance, and laying a solid technical foundation for high-quality and high-efficiency processing of automobile chassis metal parts 3.

[0091] Specifically, a receiving cavity 105 is provided on the lower surface of the stamping upper die 1, and the receiving cavity 105 is used to receive the first punch head 101, the second punch head and the third punch head 103, and the receiving cavity 105 passes upward through the lower surface of the stamping upper die 1, and the receiving cavity 105 is connected to the through hole 1011, so that the external delivery of the refrigerant is delivered to the delivery hose 4 through a pipeline.

[0092] As can be seen from the above, a receiving cavity 105 is provided on the lower surface of the stamping upper die 1. The shape and size of the receiving cavity 105 are carefully designed to accommodate the first punch head 101, the second punch head 102 and the third punch head 103 during the mold closing and mold opening process of the stamping upper die 1 and the stamping lower die 2, and to maintain a relatively stable and tight fit during multiple reciprocating motions. Specifically, the lower edge of the receiving cavity 105 is connected to the overall structure of the stamping upper die 1, so that the first punch head 101, the second punch head 102 and the third punch head 103 can be reliably placed in the receiving cavity 105 when performing processes such as pressing, trimming, and punching, avoiding dislocation or loosening due to high-speed impact or vibration. At the same time, the receiving cavity 105 is tightly attached to the lower surface of the stamping upper die 1, making the mold structure more integrated, and providing sufficient support and precision guarantee when the punching machine is frequently operated.

[0093] A through hole 1011 is further connected above the accommodating cavity 105, and the through hole 1011 cooperates with the external refrigerant delivery system and is connected to the delivery hose 4 through a pipeline. Such a design enables the refrigerant to be stably and quickly delivered to the accommodating cavity 105 from the external refrigerant source or cooling device, and forms a continuous cooling or constant temperature environment around the relevant parts of the first punch head 101, the second punch head 102 and the third punch head 103. When the stamping upper die 1 and the stamping lower die 2 are in the mold closing state, the refrigerant can flow directly into the accommodating cavity 105 along the through hole 1011 and the pipeline, and then enter each punch head and its internal guide hole along the delivery hose 4; in the mold opening state, the connection between the accommodating cavity 105 and the through hole 1011 remains unobstructed, and the residual heat accumulated during the processing can be quickly taken away, and the mold can be cooled or the temperature is balanced during the gap time. Through this refrigerant transmission method that can be achieved in both the upper and lower mold closing and mold opening, the cooling delay or dead angle problem caused by the high-frequency reciprocating motion of the stamping operation is greatly reduced.

[0094] Specifically, the second punch head 102 adopts a modular multiple block structure, which is respectively surrounded by the stamping punch 201, and the block structures are respectively fixedly connected to the accommodating cavity 105, and driven by the stamping upper die 1 to cut the material strip downward; and the first punch head 101 is driven by multiple longitudinal hydraulic cylinders 1013 to realize the independent movement of the first punch head 101, the second punch head and the third punch head 103.

[0095] As can be seen from the above, the second punch head 102 adopts a plurality of modular block structures, which are distributed in a circular manner and surround the punch 201. By fixing the block structures to the accommodating cavity 105 respectively, each block structure can be moved downward in the longitudinal direction driven by the punch upper die 1, so as to cut or separate the material strip. Specifically, these block structures are usually arranged in a fan-shaped or annular shape, and a certain gap can be maintained between each other to facilitate installation and refrigerant diversion, and are firmly connected to the side wall or bottom of the accommodating cavity 105 by fixing methods such as bolts, guide columns or interlocking parts. Therefore, when the punching machine performs the mold closing action, the force generated by the downward pressure of the punch upper die 1 can be evenly transmitted to each block structure of the second punch head 102, so that they can complete the precise trimming process after contacting the punch 201 and the automobile chassis metal parts 3. Since the cutting edge or pressing position corresponding to each block structure can be disassembled or replaced individually, the modular design not only improves the flexibility and efficiency of edge cutting, but also facilitates future maintenance and customized modification of the block.

[0096] At the same time, the first punch head 101 is driven by a plurality of hydraulic cylinders 1013 arranged longitudinally to achieve precise adjustment under different workstations or different travel requirements. In other words, the first punch head 101 no longer moves only by advancing and retreating together with the upper die as a whole, but is provided with an independent and controllable up and down travel by the hydraulic cylinder 1013. The advantage of this design is that when a larger range of press forming is required, the first punch head 101 can be moved downward or upward alone to meet the plastic deformation requirements of the material strip at a specific stage; and when other processes (such as trimming of the second punch head 102 or punching of the third punch head 103) are in working state, the first punch head 101 can be maintained at a specific height or completely withdrawn into the accommodating cavity 105, reserving more working space for subsequent operations.

[0097] In any of the above embodiments, the first punching head 101 is longitudinally provided with a through hole 1011 for the bearing seat 1032 and the punching rod 1031 to move, and a limiting platform 1012 corresponding to the assembly hole 1033 in the longitudinal direction is formed in the middle of the through hole 1011, and the limiting platform 1012 is used to limit the movement stroke of the punching rod 1031 and the ejection position of the refrigerant at the end of the punching rod 1031.

[0098] In this embodiment, the first punching head 101 is provided with a through hole 1011 along the longitudinal direction for the bearing seat 1032 and the punching rod 1031 to reciprocate up and down. A limiting platform 1012 corresponding to the assembly hole 1033 on the bearing seat 1032 is specially formed in the middle position of the through hole 1011. The function of the limiting platform 1012 is to accurately limit the movement stroke of the punching rod 1031 in the third punching head 103, and to provide a stable support and spatial guidance for the ejection position of the refrigerant at the bottom of the punching rod 1031.

[0099] First, the through hole 1011 itself is a movement channel reserved by the first punch head 101 in the longitudinal direction to meet the needs of the punching operation, which is used to allow the bearing seat 1032 and the punching rod 1031 of the third punch head 103 to slide flexibly at different stages of mold closing and mold opening. Since the first punch head 101 simultaneously assumes the key functions of preliminary pressing and forming and cooperating with the punching punch 201, when designing the through hole 1011, it is necessary to take into account multiple aspects such as internal space, rigid strength and processing accuracy to ensure that the punching rod 1031 can still maintain a stable movement trajectory during high-frequency stamping.

[0100] Secondly, a limiting platform 1012 is formed in the middle of the through hole 1011. The limiting platform 1012 is usually a thickened or laterally extended step structure, which corresponds to the assembly hole 1033 on the supporting seat 1032 that cooperates with the moving end of the punching machine in the longitudinal position, which can not only limit the stroke of the punching rod 1031, but also provide some fixed-point support for the punching rod 1031 or the supporting seat 1032. For example, when the punching rod 1031 is performing a punching or refrigerant injection operation, the limiting platform 1012 can provide a stable support when the punching rod reaches a certain limit position when it descends, preventing the punching rod 1031 from excessively probing or causing mold damage due to accidental impact. At the same time, the limiting platform 1012 can also help the refrigerant to be more accurately aligned with the gap between the first punch head 101 and the punching punch 201 when it is ejected, so as to ensure that the cooling medium is continuously and evenly distributed in the key area, avoiding the problem of reduced cooling efficiency or local accumulation of liquid caused by the offset of the injection angle.

[0101] On this basis, the refrigerant ejection position at the end of the punching rod 1031 is also constrained by the limiting platform 1012 to ensure that the refrigerant can be stably delivered to the working surface that needs to be cooled down at different moments when the third punch head 103 moves up and down. Since the bearing seat 1032 of the third punch head 103 is often connected to the temperature control structure and the delivery hose 4, the refrigerant will be transmitted downward through the guide hole and ejected at the end of the punching rod 1031. The existence of the limiting platform 1012 means that as long as the stroke and the injection port height of the punching rod 1031 are set to a suitable range during the installation and adjustment stage, each subsequent stamping cycle can maintain the same cooling path and injection force, thereby effectively avoiding cooling imbalance or rebound fluctuations caused by stroke deviation in mass production.

[0102] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0103] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A die for trimming and punching metal parts of automobile chassis, characterized in that: It comprises a stamping upper die fixed to the moving end of the stamping machine and a stamping lower die fixed to the stamping machine, wherein a stamping die cavity for forming the automobile chassis metal part is formed between the stamping upper die and the stamping lower die; The stamping upper die includes a multi-stage punching head to process the material strip passing through the stamping machine into the automobile chassis metal parts step by step, and the multi-stage punching head includes a first punching head, a second punching head and a third punching head which are independent of each other to perform pressing, trimming and punching on the material strip in sequence; the stamping upper die also includes a temperature control structure for conveying a refrigerant, and the third punching head is connected to the temperature control structure to convey the refrigerant after punching. When the stamping upper die and the stamping lower die continuously process the material strip, the first temperature value of the stamping die cavity is adjusted to be within a preset temperature range; A temperature control channel for conveying the refrigerant is formed on the stamping lower die; when the stamping upper die and the stamping lower die are closed, the temperature control channel is connected to the temperature control structure to adjust the second temperature value of the automobile chassis metal part to be within a preset temperature range, and the third punching head includes a punching rod, and the punching rod is provided with a guide hole along the longitudinal direction; the guide hole is used to connect the temperature control structure with the temperature control channel, or to connect the temperature control structure with the stamping die cavity.

2. The mold according to claim 1, characterized in that: The stamping lower die includes at least one stamping punch, and the bottom of the first stamping head is equipped with a stamping die that matches the stamping punch; When the stamping upper die and the stamping lower die are closed, the third punching head penetrates the automobile chassis metal part and the stamping concave die.

3. The mold according to claim 1, characterized in that: A plug hole is provided in the middle of the top end of the punching punch. When the temperature control structure and the temperature control flow channel are connected, the plug hole accommodates part of the punching rod.

4. The mold according to claim 3, characterized in that: The temperature control flow channel comprises: A plurality of refrigerant cavities, wherein the refrigerant cavities are divided and formed by partitions arranged inside the stamping lower die, and the bottom of the partition is higher than the bottom of the stamping lower die, so that the bottoms of all the refrigerant cavities are connected; at least one of the refrigerant cavities is connected to the plug hole; A temperature control hole is longitudinally opened on the upper surface of the stamping lower die, and the temperature control hole is communicated with the refrigerant cavity; the circumferential edge of the automobile chassis metal part is an extended edge, and the temperature control hole corresponds to the extended edge in the longitudinal direction.

5. The mold according to claim 4, characterized in that: The stamping lower die is provided with a discharge window in the transverse direction, and the discharge window is used to accommodate waste material after the third punching head performs punching. The inner cavity of the discharge window is connected with the insertion hole and the refrigerant cavity.

6. The mold according to claim 3, characterized in that: A through pipe is installed on the inner wall of the insertion hole, and the through pipe is a hollow porous structure; the inner wall of the through pipe is adapted to the side wall of the punching rod; When the automobile chassis metal part is in contact with the upper surface of the punch, the upper surface of the through pipe is in contact with the lower surface of the automobile chassis metal part.

7. The mold according to claim 1, characterized in that: The third punching head comprises a bearing seat, and the punching rod passes through the bearing seat in the longitudinal direction and is fixed on the bearing seat; The temperature control structure includes a delivery hose, and the delivery hose is connected to the guide hole; An assembly hole connected to the moving end of the punching machine is formed on one end of the upper surface of the bearing seat away from the punching rod.

8. The mold according to claim 7, characterized in that: The first punching head is provided with a through hole in the longitudinal direction for the bearing seat and the punching rod to move, and a limiting platform corresponding to the longitudinal direction of the assembly hole is formed in the middle of the through hole.

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