A punching die with ejector pin protection mechanism

Abstract

This utility model belongs to the field of mold technology, specifically relating to a punching mold with an ejector pin protection mechanism. It includes a main body containing a mold core, and an outer mold shell for fixing internal mold components. A plum blossom pad is located below the main body. A ejector pin hole for mounting and allowing ejector pin movement is coaxially located at the lower end of the plum blossom pad. An ejector pin hole is coaxially located above the ejector pin hole. Multiple fan-shaped movable holes are arranged around the ejector pin hole, forming a protective block. Multiple mating holes are formed within the protective block. A plum blossom ejector pin and an ejector pin are located within the ejector pin hole. The plum blossom ejector pin has a main rod and multiple auxiliary rods that can be inserted into the mating holes. The main rod has notches and mating blocks corresponding to the protective block and movable holes around it. A limiting block is provided on the ejector pin, and a toothed cap is located below the plum blossom pad. Through the arrangement of these components, the ejector pin is completely protected and will not deform or break under stress.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a punching mold with an ejector pin protection mechanism. Background Technology

[0002] In the field of cold heading, ejector pins, as key components, play a crucial role in the molding quality and production efficiency of products. However, to meet the precision machining requirements of some products, ejector pins are usually quite small, making them extremely fragile when subjected to large cold heading forces. When the cold heading force is too great, the ejector pin is prone to bending or even breaking, and may become stuck inside the mold. This not only directly prevents the ejector pin from working properly, but also causes serious secondary damage to the mold, especially the inner wall of the mold cavity, which is easily damaged by abnormal stress after the ejector pin becomes stuck. Damage to the inner wall of the mold cavity not only increases the mold maintenance cost, but also affects the molding accuracy of the product, leading to problems such as dimensional deviations and decreased surface quality, thereby affecting overall production efficiency and product quality.

[0003] Given the numerous problems with ejector pin protection in traditional molds, it is particularly urgent to develop a new mold structure that can effectively protect ejector pins and prevent them from bending or breaking. Utility Model Content

[0004] The purpose of this utility model is to provide a punching die with an ejector pin protection mechanism, which aims to solve the technical problem that ejector pins in existing dies are prone to bending and breaking when subjected to large cold forging forces, thereby causing damage to the die.

[0005] To achieve the above objectives, this utility model provides a punching die with an ejector pin protection mechanism, characterized in that it includes a main body, a die core, a die shell, a plum blossom pad, a plum blossom ejector pin, an ejector pin, and a tooth cover; the main body contains a die core, the main body is covered by a die shell, the plum blossom pad is provided below the main body, the lower end of the plum blossom pad is coaxially provided with an ejector pin hole for installing and allowing the plum blossom ejector pin to move, the ejector pin hole is coaxially provided above the ejector pin hole, the ejector pin hole is surrounded by multiple fan-shaped movable holes, a protective block is formed between the movable holes, the protective block is formed with multiple mating holes, the ejector pin hole and the ejector pin hole are respectively provided with a plum blossom ejector pin and an ejector pin, the plum blossom ejector pin is provided with a main rod and multiple auxiliary rods that can be inserted into the mating holes, the main rod is surrounded by notches and mating blocks corresponding to the protective block and movable holes, the ejector pin is provided with a limiting block, and a tooth cover is provided below the plum blossom pad.

[0006] Preferably, the mold core is provided with reserved holes for ejector pins to pass through and for cold pressing of metal, and the mold shell is used to fix the components inside the mold.

[0007] Preferably, the diameter of the ejector pin hole is larger than the diameter of the ejector pin hole, and the height of the ejector pin hole is greater than the height of the ejector pin's vertical movement during mold operation.

[0008] Preferably, the cross-sectional area of ​​the movable hole is the same as the cross-sectional area of ​​the protective block, and the height of the protective block is 1.5 times the vertical movement height of the ejector pin in the mold core.

[0009] Preferably, the cross-sectional shape and size of the notch are consistent with the cross-sectional shape and size of the protective block, and the mating block can move up and down in the movable hole.

[0010] Preferably, the auxiliary rod is hexagonal in shape to match the mating hole, and the total cross-sectional area of ​​the auxiliary rod is equal to the total cross-sectional area of ​​the protective block; the auxiliary rod is divided into two parts at an intersection, one part of which is fixedly connected to the bottom of the plum blossom top rod, and the other part is fixed in the mating hole of the plum blossom pad, and the two parts of the auxiliary rod intersect and overlap each other in the height direction.

[0011] Preferably, the shape of the limiting block is consistent with the shape of the mating block, and the limiting block moves up and down in the movable hole.

[0012] The above-mentioned technical solutions of one or more of the punching dies with ejector pin protection mechanism provided in this embodiment of the utility model have at least one of the following technical effects:

[0013] This utility model discloses a punching die with an ejector pin protection mechanism. With the cooperation of the plum blossom pad and the plum blossom ejector bar, the ejector pin can be fully wrapped and protected. Through the porous structure design of the plum blossom pad and the cross arrangement of the auxiliary bars on the plum blossom ejector bar and the auxiliary bars located in the plum blossom pad, the impact of cold heading force on the ejector pin is effectively dispersed. At the same time, it ensures that the ejector pin is not easy to bend or break under the action of large cold heading force, which significantly improves the service life of the ejector pin and reduces the production interruption and mold maintenance costs caused by ejector pin damage.

[0014] This utility model discloses a punching die with an ejector pin protection mechanism. The protective block of the plum blossom pad utilizes a honeycomb-like porous structure formed by hexagonal mating holes, and the auxiliary rod on the plum blossom ejector pin is designed to match the mating holes. This design ensures the protective block's strength against the ejector pin while allowing the plum blossom ejector pin to move smoothly up and down within the plum blossom pad. Furthermore, this structural design ensures the strength of the main rod on the plum blossom ejector pin, ensuring that the die effectively protects the ejector pin while maintaining a more coordinated overall structural strength. This improves the die's durability and reliability, and ultimately enhances production efficiency and product quality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A side view of a punching die with an ejector pin protection mechanism provided for an embodiment of this utility model.

[0017] Figure 2 for Figure 1 Sectional view at point AA.

[0018] Figure 3 An exploded view of a punching die with an ejector pin protection mechanism provided for an embodiment of this utility model.

[0019] Figure 4 A partial view of a punching die with an ejector pin protection mechanism provided for an embodiment of this utility model.

[0020] Figure 5 A partial view of a punching die with an ejector pin protection mechanism provided for an embodiment of this utility model.

[0021] Figure 6 A side view of a plum blossom pad in a punching die with an ejector pin protection mechanism, provided for an embodiment of this utility model.

[0022] Figure 7 for Figure 6 Sectional view at point BB.

[0023] Figure 8 A perspective view of a plum blossom ejector pin in a punching die with an ejector pin protection mechanism, provided for an embodiment of this utility model.

[0024] Figure 9 This is a perspective view of a secondary bar in a punching die with an ejector pin protection mechanism, provided as an embodiment of the present invention.

[0025] The following are the labeling elements in the figure:

[0026] 10—Main body; 20—Mold core; 30—Mold shell; 40—Plum blossom pad; 41—Ejector pin hole; 42—Modible hole

[0027] 43—Ejector pin hole; 44—Protective block; 45—Matching hole; 50—Plum blossom ejector pin; 51—Notch

[0028] 52—Matching block; 53—Main rod; 54—Secondary rod; 60—Ejector pin; 61—Limiting block; 70—Tooth cover. Detailed Implementation

[0029] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0033] In one embodiment of this utility model, such as Figure 1-3 As shown, a punching die with an ejector pin protection mechanism is provided, including a main body 10, a die core 20, a die shell 30, a plum blossom pad 40, a plum blossom ejector bar 50, an ejector pin 60, and a tooth cover 70.

[0034] The main body 10 is provided with a mold core 20, which has reserved holes for ejector pins 60 to pass through and for cold pressing metal. A mold shell 30 is sleeved around the mold core 20 to fix the internal components of the mold. A plum blossom pad 40 is provided in the mold shell 30, which is located below the mold core 20. The upper and lower ends of the plum blossom pad 40 are respectively provided with plum blossom ejector rods 50 and ejector pins 60. Under the fixing action of the plum blossom ejector rods 50, the ejector pins 60 cooperate with the mold core 20. Under the pressure of the driving mechanism above the mold core 20, the material is formed in the mold core 20. During the material forming process, the ejector pins 60 are subjected to a large cold forging force. Under the protection of the plum blossom pad 40, the ejector pins 60 are not easy to break. At the same time, with the design of the multi-hole structure of the plum blossom pad 40 and the cooperation between the plum blossom pad 40 and the plum blossom ejector rods 50, the strength of the plum blossom ejector rods 50 is also guaranteed while ensuring the protection of the ejector pins 60, thus improving the overall quality of the mold. Below the plum blossom pad 40 and inside the mold shell 30, there is also a toothed cover 70 for fixing the various components in the mold to the mold shell 30.

[0035] like Figure 4-7 As shown, the lower end of the plum blossom pad 40 is coaxially provided with a top rod hole 41 for installing and allowing the plum blossom top rod 50 to move. Above the top rod hole 41, there is a pin hole 43 coaxially provided, and the diameter of the top rod hole 41 is larger than the diameter of the pin hole 43, and the height of the top rod hole 41 is greater than the height of the pin 60 moving up and down.

[0036] The ejector pin hole 43 is surrounded by multiple fan-shaped movable holes 42. These movable holes 42 provide space for the vertical movement of the plum blossom ejector rod 50. A protective block 44 is formed between the movable holes 42. The protective block 44 is also fan-shaped and encloses the ejector pin 60 and the plum blossom ejector rod 50. The cross-sectional area of ​​the movable holes 42 is the same as that of the protective block 44 to ensure the strength of the plum blossom ejector rod 50 while protecting the ejector pin 60.

[0037] The protective block 44 has multiple mating holes 45, which are hexagonal in shape. The arrangement of these holes creates a honeycomb-like porous structure. Hexagons are a stable geometric shape that can evenly distribute external forces, giving the structure good load-bearing capacity in all directions. This ensures the strength of the protective block 44 while allowing the plum blossom-shaped ejector pin 50 to move up and down within the plum blossom-shaped pad 40. The height of the protective block 44 is 1.5 times the vertical movement height of the ejector pin 60.

[0038] like Figure 8 , 9As shown, the top rod hole 41 is provided with a plum blossom top rod 50 and a top pin 60. The plum blossom top rod 50 is provided with multiple notches 51. The cross-section of the notches 51 is the same as the cross-section of the protective block 44. The notches 51 enable the plum blossom top rod 50 to move up and down in the plum blossom pad 40.

[0039] The notch 51 above the plum blossom top rod 50 is provided with multiple mating blocks 52, and the mating blocks 52 can move up and down in the movable hole 42.

[0040] A main rod 53 is formed above the plum blossom top rod 50 and between multiple mating blocks 52, and the main rod 53 and the mating blocks 52 together support the top pin 60.

[0041] Above the plum blossom top rod 50 and within the notch 51, multiple auxiliary rods 54 are provided. These auxiliary rods 54 are housed within the protective block 44, and each auxiliary rod 54 is hexagonal in shape, matching the mating hole 45. The auxiliary rods 54 can move up and down within the mating hole 45. The total cross-sectional area of ​​the auxiliary rods 54 is the same as the total cross-sectional area of ​​the protective block 44.

[0042] The auxiliary rod 54 is divided into two parts in a cross shape. One part is fixed at the bottom to the top rod 50, and the other part is fixed in the mating hole 45 in the plum blossom pad 40. The two parts of the auxiliary rod 54 overlap in height.

[0043] The ejector pin 60 is provided with a limiting block 61, the shape of which is consistent with the shape of the mating block 52, and the limiting block 61 moves up and down in the movable hole 42.

[0044] The working principle of this utility model is as follows: A punching die with an ejector pin protection mechanism is used in which the plum blossom ejector pin 50 is located at the lower end of the ejector pin hole 41, and the plum blossom ejector pin 50 supports the ejector pin 60, so that the ejector pin 60 is located at the required height in the die core 20. When the driving mechanism applies cold forging force to the material, the material is processed and shaped under the action of the die core 20 and the ejector pin 60. When the ejector pin 60 is subjected to cold forging force, the protective block 44 in the plum blossom pad 40 wraps and protects the ejector pin 60, preventing the ejector pin 60 from easily bending and breaking when subjected to large cold forging force. At the same time, the protective block 44 has a porous structure and has an auxiliary rod 54 inside, which further strengthens the protection strength of the protective block 44 for the ejector pin 60. The auxiliary rod 54 located on the plum blossom ejector 50 is arranged to cross with the auxiliary rod 54 fixed in the plum blossom pad 40. While ensuring that the plum blossom ejector 50 can move up and down to push out the material after molding, it can also enhance the strength of the main rod 53 on the plum blossom ejector 50. This ensures that while protecting the ejector pin 60, it also prevents the plum blossom ejector 50 from being too weak, further increasing the coordination of the mold in terms of strength.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A punching die with an ejector pin protection mechanism, characterized in that: The system includes a main body (10), a mold core (20), a mold shell (30), a plum blossom pad (40), a plum blossom ejector pin (50), an ejector pin (60), and a toothed cover (70). The main body (10) contains the mold core (20), and the main body (10) is covered by the mold shell (30). The plum blossom pad (40) is located below the main body (10). The lower end of the plum blossom pad (40) is coaxially provided with an ejector pin hole (41) for installing and allowing the plum blossom ejector pin (50) to move. Above the ejector pin hole (41) is a coaxially provided ejector pin hole (43). The ejector pin hole (43) is surrounded by multiple fan-shaped movable holes (42). (42) forms a protective block (44), and the protective block (44) has multiple mating holes (45). The ejector pin hole (41) and ejector pin hole (43) are respectively provided with a plum blossom ejector pin (50) and an ejector pin (60). The plum blossom ejector pin (50) is provided with a main rod (53) and multiple auxiliary rods (54) that can be inserted into the mating holes (45). The main rod (53) is provided with notches (51) and mating blocks (52) corresponding to the protective block (44) and the movable hole (42) on its periphery. The ejector pin (60) is provided with a limiting block (61). The plum blossom pad (40) is provided with a tooth cover (70) below it.

2. A punching die with an ejector pin protection mechanism according to claim 1, characterized in that: The mold core (20) is provided with reserved holes for the ejector pin (60) to pass through and for cold pressing of the metal, and the mold shell (30) is used to fix the components inside the mold.

3. A punching die with an ejector pin protection mechanism according to claim 1, characterized in that: The diameter of the ejector hole (41) is greater than the diameter of the ejector pin hole (43), and the height of the ejector hole (41) is greater than the height of the ejector pin (60) during the mold operation.

4. A punching die with an ejector pin protection mechanism according to claim 1, characterized in that: The cross-sectional area of ​​the movable hole (42) is the same as that of the protective block (44), and the height of the protective block (44) is 1.5 times the height of the ejector pin (60) moving up and down in the mold core (20).

5. A punching die with an ejector pin protection mechanism according to claim 1, characterized in that: The cross-sectional shape and size of the notch (51) are consistent with the cross-sectional shape and size of the protective block (44), and the mating block (52) can move up and down in the movable hole (42).

6. A punching die with an ejector pin protection mechanism according to claim 1, characterized in that: The auxiliary rod (54) is hexagonal in shape to match the mating hole (45), and the total cross-sectional area of ​​the auxiliary rod (54) is equal to the total cross-sectional area of ​​the protective block (44). The auxiliary rod (54) is divided into two parts, one part of which is fixedly connected to the bottom of the plum blossom top rod (50), and the other part is fixed in the mating hole (45) of the plum blossom pad (40), and the two parts of the auxiliary rod (54) overlap each other in the height direction.

7. A punching die with an ejector pin protection mechanism according to claim 1, characterized in that: The shape of the limiting block (61) is consistent with the shape of the mating block (52), and the limiting block (61) moves up and down in the movable hole (42).

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