Fine blanking die for small-specification chain

Abstract

The utility model relates to the technical field of chain plate stamping, in particular to a fine stamping die for a small-specification chain, which comprises an upper die mechanism and a lower die mechanism, the upper die mechanism comprises an ejection assembly, the lower surface of the upper die mechanism is provided with a concave die groove embedded with a concave die, and the ejection assembly extends downwards into the concave die groove and is in clearance fit with the concave die; the lower die mechanism comprises a male die, a die opening hole capable of being matched with the ejection assembly is formed in the top end of the male die, and meanwhile the arrangement position of the male die on the lower die mechanism corresponds to the arrangement position of the ejection assembly. When the die is closed, the lower die mechanism drives the male die to move upwards to be in contact with the female die and the ejection assembly so as to punch a blank, and when the die is opened, the ejection assembly can eject the blank out of the female die groove. According to the scheme, the female die and the male die are reversely arranged on the basis of an existing common continuous die, the mode that the lower die mechanism moves upwards is adopted, the requirement for reverse stress of blank punching and blanking is met, then the straightness and load strength of a blank are improved, and the existing defects are overcome.

Description

Technical Field

[0001] This utility model relates to the field of chain plate stamping technology, specifically to a fine stamping die for small-sized chains. Background Technology

[0002] There are currently two main types of stamping dies for chain plates: one is a single-piece compound die, which is characterized by low efficiency and low material utilization, and is more suitable for the step-by-step stamping of larger-sized industrial chain plates; the advantage of the compound die is that the punching and blanking forces are opposite, which improves the straightness of the chain plate; the other is a multi-station progressive die, in which the forming steps are continuously distributed according to the requirements of the chain plate, and a series of complex processes such as punching, folding, trimming, and chamfering are completed in a certain order; the use of progressive dies greatly improves the processing efficiency and material utilization of chain plates, and is currently the most commonly used chain plate stamping method.

[0003] However, since progressive die blanking is still a type of ordinary blanking, the inherent perpendicularity of the cut surface in clearance blanking is not high, and the flat chain plates are subjected to the same force during punching and blanking, resulting in low flatness of the chain plates. This makes the chain plates prone to stress concentration and fatigue failure under high loads. Especially for chains used in sports motorcycles and electric vehicles, in order to meet the requirements of lightweighting and reducing energy consumption, the redundancy of the effective load-bearing area of ​​the chain plates is becoming increasingly limited, which is difficult for ordinary progressive dies to meet. Particularly for some small-sized chain products, the blank size is small, and even small stamping defects can easily affect the strength and fatigue performance of the product.

[0004] To address the issues raised above, a fine stamping die for small-diameter chains is now proposed. Utility Model Content

[0005] The purpose of this invention is to provide a fine stamping die for small-sized chains to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fine stamping die for small-specification chains, comprising an upper die mechanism and a lower die mechanism. The upper die mechanism includes a punching assembly, and a die groove with a built-in die cavity is provided on the lower surface of the upper die mechanism. The punching assembly extends downward into the die groove and is clearance-fitted with the die cavity. The lower die mechanism includes a punch, the position of which corresponds to the position of the die cavity on the lower die mechanism. When the die is closed, the lower die mechanism drives the punch to move upward to contact the die cavity and the punching assembly for blank stamping. When the die is opened, the punching assembly can eject the blank from the die groove.

[0007] As a preferred embodiment of this application, the upper mold mechanism includes an upper mold base, which is provided with an upper pad, an upper clamping plate and an upper template from top to bottom. The punching assembly is fixed on the upper clamping plate and extends downward through the upper clamping plate and the upper template until it is located in the cavity.

[0008] As a preferred embodiment of this application, the punching assembly includes a punch and a pusher, wherein the pusher is a pusher cylinder structure that is sleeved on the outer periphery of the punch and fixed on the upper template.

[0009] As a preferred embodiment of this application, the end of the punch is flush with the end of the ejector, or the end of the punch extends beyond the end of the ejector.

[0010] As a preferred embodiment of this application, a lower stripper plate is connected to the lower part of the upper template via an elastic guide post. An elastic clamping area is formed between the lower stripper plate and the upper template to clamp and fix the chain plate material. At the same time, the lower stripper plate is provided with an opening through which the punch can pass.

[0011] As a preferred embodiment of this application, the lower mold mechanism includes a lower mold base, on which a lower pad and a lower clamping plate are installed sequentially from bottom to top, and the punch is fixed on the lower clamping plate and extends upward.

[0012] As a preferred embodiment of this application, the punch has a columnar structure and an internal blanking cavity.

[0013] As a preferred embodiment of this application, a replaceable die is embedded in the die groove.

[0014] As a preferred embodiment of this application, the downwardly extending end of the punching assembly is flush with the opening of the die groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) The fine blanking die for the small-specification chain adopts the principle of the lower die mechanism moving upward, and a cavity groove and a punch assembly are set on the upper die mechanism, and a punch is set on the lower die mechanism. When the die is closed, the lower die mechanism is controlled to move upward and approach the upper die mechanism, so that the punch approaches the cavity groove and makes upward extrusion contact with the cavity and the punch assembly to realize blank cutting and punching. It can be seen that the fine blanking die of this solution has been improved on the basis of the existing ordinary continuous die, realizing the requirement of reverse force of blank punching and blanking, thereby improving the straightness and load strength of the punched chain plate and solving the existing deficiencies.

[0017] (2) The mold of this solution does not need to set a guide hole outside the blank, which reduces the number of steps of the mold. At the same time, since there is no guide pin, the stress deformation of the material during stamping is not restricted by the guide pin and can be freely dispersed. The shear band thickness of the blank is more uniform. For the production of small-sized chains, the tear band control is more accurate and the stamped blank size is more compact and reliable.

[0018] (3) The mold has a simple structure, which reduces the cost of mold manufacturing and use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the mold structure in this utility model;

[0020] Figure 2 This is a schematic diagram of the end structure of the punch and ejector in this utility model;

[0021] Figure 3 This is a schematic diagram of the main structure of the punch body;

[0022] Figure 4 This is a schematic diagram of the top component structure in this utility model;

[0023] Figure 5 This is a schematic diagram of the mold layout in this utility model;

[0024] Figure 6 This is a schematic diagram of the arrangement structure of the die cavity in the die cavity groove in this utility model.

[0025] Figure label:

[0026] 10. Upper mold base; 11. Upper backing plate; 12. Upper clamping plate; 13. Upper template; 14. Punch; 15. Die cavity; 151. Die cavity; 20. Lower mold base; 21. Punch; 211. Blanking cavity; 22. Lower backing plate; 23. Lower clamping plate; 24. Lower stripper plate; 25. Elastic guide post; 30. Guide mechanism; 31. Guide sleeve; 32. Guide rod; 33. Connecting spring; 40. Ejector. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0028] Please see Figure 1 This embodiment provides a small-specification chain fine stamping die, including an upper die mechanism and a lower die mechanism. In this embodiment, a guide mechanism 30 is provided between the upper die mechanism and the lower die mechanism. The guide mechanism 30 includes a guide sleeve 31 connected to the upper die mechanism and a guide rod 32 fixedly connected to the lower die mechanism. A connecting spring 33 is sleeved between the guide sleeve 31 and the guide rod 32. The action of closing and opening the die is realized by the guide sleeve 31 sliding on the guide rod 32.

[0029] The upper die mechanism includes a punch assembly, and a die groove 15 with a built-in die cavity 151 is provided on the lower surface of the upper die mechanism. It can be understood that the die cavity 151 can be embedded entirely within the die groove 15, or disposed at a partial position within the die groove 15, depending on the size of the die groove 15. The punch assembly extends downward into the die groove 15 and has a clearance fit with the die cavity 151. In this embodiment, as the name suggests, the punch assembly should have both punching and ejecting functions. The lower die mechanism includes a punch 21, the position of which corresponds to the position of the die cavity 151, i.e., the punch assembly. Figure 2-3 The diagram shows the end structure of the punch 21 and its main body structure in this embodiment. It can be understood that the end structure of the punch 21 should correspond to the structure of the die 151 in the die groove 15, so that the blank with the required structure can be cut from the chain plate material. When the upper die mechanism and the lower die mechanism are closed, the lower die mechanism drives the punch 21 to move upward and approach the die groove 15, and make upward pressing contact with the die 151 and the punching assembly to achieve cutting and punching on the chain plate material to obtain the blank. When the die is opened, the punching assembly can push the blank out of the die groove 15, and at this time, one blank punching is completed.

[0030] Specifically, in this embodiment, the fine blanking die for small-specification chains adopts the principle of upward movement of the lower die mechanism. A die groove 15 and a punch assembly are provided on the upper die mechanism, and a punch 21 is provided on the lower die mechanism. During the die closing position, the lower die mechanism is controlled to move upwards towards the upper die mechanism, causing the punch 21 to approach the die groove 15 and make upward pressing contact with the die 151 and the punch assembly to achieve blank cutting and punching. During this process, the punch assembly is subjected to upward pressing force to punch the blank. After punching, when entering the die opening position, the blank is pushed out of the die groove 15 by the downward force of the punch assembly. Therefore, this fine blanking die solution, based on existing ordinary progressive dies... Based on this, the die 151 and punch are reversed, and the lower die mechanism is moved upwards to achieve the requirement of reverse force on the chain plate blank during punching and blanking, thereby improving the flatness and load strength of the punched blank and solving the shortcomings of the existing system. In addition, this solution eliminates the need for separate guide holes outside the blank, reducing the number of die steps. Furthermore, since there are no guide pins, the material deformation during stamping is not restricted by the guide pins and can freely disperse, resulting in a more uniform shear band thickness and improved perpendicularity of the blank cutting surface. Especially for the production of small-sized chains, tear band control is more accurate, and the stamped blank dimensions are more compact and reliable. Figure 5 The diagram shown is a layout diagram of the chain blank prepared using the fine stamping die of this embodiment.

[0031] The upper mold mechanism includes an upper mold base 10, which is provided with an upper pad 11, an upper clamping plate 12 and an upper template 13 from top to bottom. The punching assembly is fixed on the upper clamping plate 12 and extends downward to pass through the upper clamping plate 12 and the upper template 13 until it is located in the cavity 15.

[0032] Specifically, an upper pad 11 is fixedly installed on the upper mold base 10, an upper clamping plate 12 is fixedly installed at the lower end of the upper pad 11, an upper template 13 is provided below the upper clamping plate 12, and the punching assembly extends downward through the upper template 13, with its extended end flush with the opening of the die groove 15, so that the punch 21 can contact the punching assembly to achieve effective punching.

[0033] A lower stripper plate 24 is connected to the lower part of the upper template 13 via an elastic guide post 25. The lower stripper plate 24 has an opening through which the punch 21 can pass. The lower stripper plate 24 can contact the upper template 13 to clamp and fix the chain plate material. In this embodiment, the elastic guide post 25 can guide the lower stripper plate 24 to be accurately aligned with the upper template 13. On the other hand, it also forms an elastic clamping area between the lower stripper plate 24 and the upper template 13. The elastic clamping area facilitates the elastic clamping of the chain plate material, improves the stability of the chain plate material, and avoids displacement during cutting and punching, which would affect the punching accuracy and the quality of the blank.

[0034] The lower mold mechanism includes a lower mold base 20, on which a lower pad 22 and a lower clamping plate 23 are installed sequentially from bottom to top. The punch 21 is fixed on the lower clamping plate 23 and extends upward. It can be understood that after the mold is closed, the punch 21 can penetrate the lower stripper plate 24 and contact the chain plate material.

[0035] The punch assembly includes a punch 14 and a pusher 40, wherein the pusher 10 is a pusher cylinder structure, such as... Figure 4 The diagram shows the structure of the ejector 40 provided in this embodiment. The outer contour of the ejector cylinder is similar to that of the die 151, except that its size is slightly smaller than that of the die 151. Thus, it is arranged with the die 151 in a clearance fit manner. The ejector 40 is sleeved on the outer periphery of the punch 14 and fixed on the upper template 13. During the punching process, the punch 21 moves upward and first contacts the chain plate material placed between the upper template 13 and the lower stripper plate 24. Then, under the action of external force, it cooperates with the die 151 and the punching assembly in the die groove 15 to squeeze the chain plate blank, thereby realizing the punching of the blank with the required structure on the chain plate material. The punched blank is clamped in the die groove 15. When the mold is opened, the clamping force disappears, and the blank is ejected from the die groove 15 under the action of the ejector 40.

[0036] The downward-extending end of the punch assembly is flush with the opening of the die groove 15, that is, flush with the opening of the die 151, thus enabling precise punching.

[0037] The end of the punch 14 is flush with the end of the ejector 40, or the end of the punch 14 extends beyond the end of the ejector (40). In this embodiment, the former is preferred, as it provides higher safety.

[0038] Understandably, multiple dies 151 can be set within the die groove 15, such as... Figure 6 As shown, correspondingly, multiple sets of punching components and punches 21 on the lower die mechanism are also provided, which can realize the simultaneous punching of multiple blanks and improve the punching efficiency.

[0039] like Figure 2-3 The diagram shown is a structural schematic of the punch 21 provided in this embodiment. The punch 21 is a columnar structure, and its top structure corresponds to the die 151. It is provided with a die opening hole corresponding to the punch 14. At the same time, it is provided with a blanking cavity 211 that communicates with the die opening hole. The punching waste can be discharged downward from the blanking cavity 211. In this embodiment, the blanking cavity 211 is designed to be through along the length of the punch 21.

[0040] The specific operating principle of this scheme includes: When the mold is working, as the lower mold base 20 approaches the upper mold base 10 and the mold begins to close, the lower stripper plate 24 moves upward under the action of the elastic guide post 25. Then, the lower stripper plate 24 contacts and presses the chain plate material placed in the die cavity 15. After pressing, the lower mold base 20 continues to move upward, which in turn drives the lower clamping plate 23 to continue to move upward. At this time, the punch 21 passes through the lower stripper plate 24 and contacts the chain plate material. Then, in conjunction with the die cavity 151 and the punch 14, the chain plate material is cut and punched by extrusion to obtain the blank. During the punching process, the punching waste will be punched into the blanking cavity 211 of the punch 21 and discharged. During the mold opening process, as the upper mold mechanism and the lower mold mechanism separate, the extrusion force on the blank disappears. At this time, the blank in the die cavity 151 is pushed downward under the action of the ejector 40. One punching is completed. The cycle is repeated.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A fine stamping die for small-diameter chains, comprising an upper die mechanism and a lower die mechanism, characterized in that, The upper mold mechanism includes a punching assembly, and a die groove (15) with a built-in die cavity (151) is provided on the lower surface of the upper mold mechanism. The punching assembly extends downward into the die groove (15) and is in clearance fit with the die cavity (151). The lower mold mechanism includes a punch (21), and the position of the punch (21) on the lower mold mechanism corresponds to the position of the die cavity (151). When the mold is closed, the lower mold mechanism drives the punch (21) to move upward so that it can contact the die cavity (151) and the punching assembly to punch the blank. When the mold is opened, the punching assembly can eject the blank out of the die groove (15).

2. The fine stamping die for small-diameter chains according to claim 1, characterized in that, The upper mold mechanism includes an upper mold base (10), which is provided with an upper pad (11), an upper clamping plate (12) and an upper template (13) from top to bottom. The punching assembly is fixed on the upper clamping plate (12) and extends downward to pass through the upper clamping plate (12) and the upper template (13) until it is located in the cavity groove (15).

3. The fine stamping die for small-diameter chains according to claim 2, characterized in that, The punching assembly includes a punch (14) and a pusher (40). The pusher (40) is a pusher structure, which is sleeved on the outer periphery of the punch (14) and fixed on the upper template (13).

4. The fine stamping die for small-diameter chains according to claim 3, characterized in that, The end of the punch (14) is flush with the end of the top piece (40), or the end of the punch (14) extends beyond the end of the top piece (40).

5. The fine stamping die for small-diameter chains according to claim 2, characterized in that, Below the upper template (13), a lower stripper plate (24) is connected by an elastic guide post (25). The lower stripper plate (24) and the upper template (13) form an elastic clamping area for clamping and fixing the chain plate material. At the same time, the lower stripper plate (24) is provided with an opening through which the punch (21) can pass.

6. The fine stamping die for small-diameter chains according to claim 1, characterized in that, The lower mold mechanism includes a lower mold base (20), on which a lower pad (22) and a lower clamping plate (23) are installed sequentially from bottom to top. The punch (21) is fixed on the lower clamping plate (23) and extends upward.

7. The fine stamping die for small-diameter chains according to claim 1, characterized in that, The punch (21) has a columnar structure and a blanking cavity (211) is provided inside the punch (21).

8. The fine stamping die for small-diameter chains according to claim 1, characterized in that, A replaceable die (151) is embedded in the die groove (15).

9. The fine stamping die for small-diameter chains according to claim 1, characterized in that, The downward-extending end of the punching assembly is flush with the opening of the die groove (15).

Images