A powder metallurgy mold ejection pin structure

Abstract

This utility model belongs to the field of powder metallurgy mold technology and discloses an ejector pin structure for powder metallurgy molds, including a base plate, a plurality of guide rods arranged in a regular quadrilateral shape on the top of the base plate, and an ejector pin on the top of the base plate. This utility model increases the contact area between the ejector pin and the molded part by allowing the arc-shaped concave edge and wavy protrusions to form a close contact with the surface of the molded part during demolding. Simultaneously, the symmetrically opened grooves on the outer side of the ejector pin disperse the impact force during ejection, extending the service life. When it is necessary to replace ejector pins of different specifications to adapt to different molded parts, the old ejector pin can be quickly disassembled by simply peeling off the Velcro and nylon tape, and the new ejector pin can be re-attached and fixed, thus reducing the frequency of consumable replacement.

Description

Technical Field

[0001] This utility model belongs to the field of powder metallurgy mold technology, specifically an ejector pin structure for powder metallurgy molds. Background Technology

[0002] Powder metallurgy molds are specialized tools used to press metal powder into blanks of specific shapes, which are then sintered and processed into final parts. They are the core equipment for part forming in powder metallurgy processes.

[0003] In some powder metallurgy parts manufacturing enterprises with high-frequency production, the front end of the powder feeding box often uses a foam pad to continuously rub against the mold or molded product. However, the foam surface is very easy to wear and peel off. Powder feeding boxes made of foam material often need to be replaced in a short period of time. This not only increases maintenance costs but also leads to production interruption and reduces production efficiency. In view of this, an ejector pin structure for powder metallurgy molds is proposed to solve the above problems. Summary of the Invention

[0004] To address the problems mentioned in the background art, this utility model provides an ejector pin structure for powder metallurgy molds.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an ejector pin structure for powder metallurgy molds, comprising a base plate, a plurality of guide rods arranged in a regular quadrilateral shape on the top of the base plate, an ejector rod on the top of the base plate, a lower bottom mold, an upper bottom mold, a lower outer mold, an upper outer mold, and a connecting plate slidably arranged on the outer side of the guide rods, a lower bottom mold or an upper bottom mold slidably arranged coaxially on the inner side of the lower outer mold and the upper outer mold respectively, a central mold fixedly arranged on the inner side of the connecting plate, a lower outer mold and an upper outer mold slidably arranged on the inner side of the central mold, an ejector rod slidably arranged on the inner side of both the lower bottom mold and the upper bottom mold, a lower powder box slidably arranged on the outer side of the connecting plate, a conveying pipe arranged on the top of the outer side of the lower powder box, and an ejector detachably arranged at the outer end of the lower powder box near the central mold, the ejector having an arc-shaped concave edge on its outer side.

[0006] Preferably, the ejector is provided with Velcro on the side near the lower powder box, the Velcro is attached to the outside of the nylon patch, and the nylon patch is fixed to the outside of the lower powder box.

[0007] Preferably, the outer side of the arc-shaped concave edge is provided with a wave-shaped protrusion, and the outer side of the ejector is symmetrically provided with groove openings.

[0008] Preferably, the top of the connecting plate is provided with a placement groove located on the outer ring of the central mold, and a storage box is slidably provided inside the placement groove for storing powder.

[0009] Preferably, the bottom inner side of the powder dispenser is provided with an inner sloping edge.

[0010] Preferably, the storage box has a beveled edge on the top inner side to increase its fit with the bottom of the powder box.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention increases the contact area between the ejector and the molded part by allowing the arc-shaped concave edge and wavy protrusion to make close contact with the surface of the molded part during the demolding process. At the same time, the symmetrical grooves on the outer side of the ejector are used to disperse the impact force during ejection, thus extending the service life. When it is necessary to replace the ejector with a different specification to adapt to different molded parts, the old ejector can be quickly removed by simply peeling off the Velcro and nylon tape. After replacing with a new ejector, it can be re-attached and fixed, thereby reducing the frequency of consumable replacement. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the orthographic section of this utility model; Figure 3 This is a schematic diagram of the placement groove structure of this utility model; Figure 4 This is a schematic diagram of the hook and loop fastener structure of this utility model.

[0013] In the diagram: 1. Base plate; 11. Guide rod; 12. Top rod; 13. Lower bottom mold; 14. Upper bottom mold; 15. Lower outer mold; 16. Upper outer mold; 17. Connecting plate; 18. Center mold; 19. Lower powder box; 101. Material conveying pipe; 102. Ejector; 2. Velcro; 21. Nylon patch; 3. Wavy bump; 31. Groove opening; 4. Placement slot; 41. Storage box; 42. Angled edge. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figures 1 to 4As shown, this utility model provides an ejector pin structure for powder metallurgy molds, including a base plate 1. The base plate 1 has several guide rods 11 arranged in a square shape at its top. An ejector pin 12 is provided at the top of the base plate 1. A lower bottom mold 13, an upper bottom mold 14, a lower outer mold 15, an upper outer mold 16, and a connecting plate 17 are slidably arranged on the outer sides of the guide rods 11. The lower outer mold 15 and the upper outer mold 16 are coaxially slidably arranged on their inner sides, respectively. A central mold 18 is fixedly arranged on the inner side of the connecting plate 17. The lower outer mold 15 and the upper outer mold 16 are slidably arranged on the inner side of the central mold 18. An ejector pin 12 is slidably arranged on the inner sides of both the lower bottom mold 13 and the upper bottom mold 14. A lower powder box 19 is slidably arranged on the outer side of the connecting plate 17. A material conveying pipe 101 is provided at the top of the outer side of the lower powder box 19. An ejector pin 102 is detachably provided at one end of the lower powder box 19 near the central mold 18. The ejector pin 102 has an arc-shaped concave edge on its outer side.

[0016] Using the base plate 1 as a basic support, several guide rods 11 arranged in a regular quadrilateral shape are vertically fixed to the top of the base plate 1. Utilizing the symmetry of the quadrilateral layout, precise sliding guidance is provided for the lower bottom mold 13, upper bottom mold 14, lower outer mold 15, upper outer mold 16, and connecting plate 17, ensuring that each mold component does not shift when sliding along the guide rods 11, achieving initial mold positioning. The lower bottom mold 13 and upper bottom mold 14 slide along the guide rods 11 to the inner sides of the lower outer mold 15 and upper outer mold 16, respectively, coaxially engaging with the lower outer mold 15 and upper outer mold 16 to form the basic cavity of the mold. Subsequently, the connecting plate 17 slides along the guide rods 11, and the central mold 18 fixed inside it moves synchronously, causing the lower outer mold 15 and upper outer mold 16 to slide along the inner side of the central mold 18, further refining the cavity structure. Simultaneously, the inner sides of the lower bottom mold 13 and upper bottom mold 14 maintain a sliding engagement with the ejector rod 12, reserving space for subsequent ejection actions. The lower powder box 19 slides along the outer side of the connecting plate 17... The material slides horizontally to the designated position and conveys powder raw materials into the lower powder box 19 through the material conveying pipe 101. Under the action of gravity, the powder fills the cavity formed by the lower bottom mold 13, upper bottom mold 14, lower outer mold 15, upper outer mold 16 and center mold 18. After the powder is filled, each mold component applies pressure to press the powder into shape. After shaping, each mold returns to its original position, and the lower bottom mold 13 ejects the forming mold through the height difference. The power source of each mold and the lower powder box 19 is existing technology and will not be described in detail here. At the same time, the ejector 102 on the outside of the lower powder box 19 contacts the formed part and pushes the formed part out of the cavity, completing the entire forming and demolding process. The ejector 102 increases the contact area with the formed part through the arc concave edge, so that the ejection force is evenly distributed on the surface of the formed part, preventing the formed part from being damaged due to excessive local force, further ensuring the product forming quality. Moreover, the detachable ejector 102 facilitates installation, adjustment or replacement, reducing the difficulty of operation.

[0017] like Figure 4 As shown, the ejector 102 has a Velcro 2 on the side near the lower powder box 19. The Velcro 2 is attached to the outside of the nylon tape 21, which is fixed to the outside of the lower powder box 19. Through the adhesion between the Velcro 2 and the nylon tape 21, the ejector 102 and the lower powder box 19 can be detachably connected. When it is necessary to replace the ejector 102 with a different specification to adapt to different molded parts, simply peel off the Velcro 2 from the nylon tape 21 to quickly remove the old ejector 102, replace it with a new ejector 102, and then reattach and fix it.

[0018] like Figure 4 As shown, the outer side of the arc-shaped concave edge is provided with a wave-shaped protrusion 3, and the outer side of the ejector 102 is symmetrically provided with grooves 31. During the demolding process, the arc-shaped concave edge and the wave-shaped protrusion 3 can form a close contact with the surface of the molded part, increasing the contact area between the ejector 102 and the molded part. At the same time, the grooves 31 symmetrically provided on the outer side of the ejector 102 are used to disperse the impact force during ejection and improve the service life.

[0019] like Figure 3 As shown, the top of the connecting plate 17 has a placement groove 4, located on the outer ring of the central mold 18. A storage box 41 is slidably provided inside the placement groove 4 for storing powder. A slanted edge 42 is provided on the top of the inner side of the storage box 41 to increase the fit with the bottom of the powder box 19.

[0020] During the powder filling process, some loose powder will fall onto the top of the connecting plate 17. At this time, the collection box 41 can collect this loose powder. When the powder in the collection box 41 accumulates to a certain amount, the collection box 41 can be slid out along the placement groove 4 to recycle the collected powder. After the recycling is completed, the collection box 41 can be slid back into the placement groove 4 for continued use. At the same time, when the collection box 41 is placed in the placement groove 4, the inclined edge 42 forms an inclined contact surface with the top of the connecting plate 17, which reduces the possibility of powder leaking out from the gap between the two, improves the effectiveness of powder collection, and further reduces powder waste.

[0021] like Figure 4 As shown, the bottom inner side of the powder box 19 is designed with an inward bevel. This inward bevel structure promotes the downward flow of powder within the powder box 19, reduces powder residue, improves powder utilization, reduces raw material waste, and guides the powder to fill the cavity evenly, ensuring uniform density of the molded parts and improving product quality stability.

[0022] Working principle and usage process of this utility model: Using the base plate 1 as a foundation support, several guide rods 11 arranged in a regular quadrilateral shape are vertically fixed to the top of the base plate 1. Utilizing the symmetry of the quadrilateral layout, precise sliding guidance is provided for the lower bottom mold 13, upper bottom mold 14, lower outer mold 15, upper outer mold 16, and connecting plate 17, ensuring that each mold component does not shift when sliding along the guide rods 11, thus achieving initial mold positioning. The lower bottom mold 13 and upper bottom mold 14 slide along the guide rods 11 to the inside of the lower outer mold 15 and upper outer mold 16, respectively, coaxially engaging with the lower outer mold 15 and upper outer mold 16 to form the cavity foundation of the mold. Subsequently, the connecting plate 17 slides along the guide rods 11, and the central mold 18 fixed inside it moves synchronously, causing the lower outer mold 15 and upper outer mold 16 to move along the inner side of the central mold 18. The sliding mechanism further refines the cavity structure. Simultaneously, the inner sides of the lower mold 13 and upper mold 14 maintain a sliding fit with the ejector rod 12, reserving space for subsequent ejection. The lower powder box 19 slides horizontally along the outer side of the connecting plate 17 to a designated position. Powder raw materials are conveyed into the lower powder box 19 through the conveying pipe 101. Under gravity, the powder fills the cavity formed by the lower mold 13, upper mold 14, lower outer mold 15, upper outer mold 16, and center mold 18. After the powder is filled, each mold component applies pressure to press the powder into shape. After shaping, each mold resets, and the lower mold 13 ejects the forming mold through the height difference. The power sources for each mold and the lower powder box 19 are existing technologies and will not be elaborated here. Meanwhile, the outer side of the lower powder box 19... The ejector 102 contacts the molded part and pushes it out of the cavity, completing the entire molding and demolding process. The ejector 102 increases the contact area with the molded part through its arc-shaped concave edge, so that the ejection force is evenly distributed on the surface of the molded part, preventing the molded part from being damaged due to excessive local stress, and further ensuring the product molding quality. The detachable ejector 102 facilitates installation, adjustment or replacement, reducing the difficulty of operation. The ejector 102 and the powder box 19 are detachably connected by the adhesion of the Velcro 2 and the nylon tape 21. When it is necessary to replace the ejector 102 with a different specification to adapt to different molded parts, simply peel off the adhesion between the Velcro 2 and the nylon tape 21 to quickly remove the old ejector 102, replace it with the new ejector 102, and then re-adhere it. During demolding, the curved concave edge and wavy protrusion 3 can form a close contact with the surface of the molded part, increasing the contact area between the ejector 102 and the molded part. At the same time, the symmetrically opened grooves 31 on the outer side of the ejector 102 are used to disperse the impact force during ejection and improve the service life. During the powder filling process, some scattered powder will fall onto the top of the connecting plate 17. At this time, the collection box 41 can collect these scattered powders. When the powder in the collection box 41 accumulates to a certain amount, the collection box 41 can be slid out along the placement groove 4 to recycle the collected powder. After processing, the collection box 41 can be slid back into the placement groove 4 for continued use. At the same time, when the collection box 41 is placed in the placement groove 4, it forms an inclined contact surface with the top of the connecting plate 17 through the oblique edge 42.This reduces the possibility of powder leakage from the gap between the two parts, improves the effectiveness of powder collection, and further reduces powder waste. The inner beveled edge structure promotes the downward flow of powder within the lower powder box 19, reducing powder residue, improving powder utilization, and minimizing raw material waste. Simultaneously, it guides the powder to uniformly fill the cavity, ensuring uniform density of the molded parts and improving product quality stability.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A powder metallurgy mold ejection pin structure comprising a base plate (1), characterized by: The bottom plate (1) is provided with a plurality of guide rods (11) at its top, and the plurality of guide rods (11) are arranged in a regular quadrilateral. The bottom plate (1) is provided with a top rod (12) at its top. The guide rods (11) are slidably provided with a lower bottom mold (13), an upper bottom mold (14), a lower outer mold (15), an upper outer mold (16) and a connecting plate (17) on their outer sides. The lower outer mold (15) and the upper outer mold (16) are respectively slidably provided with a lower bottom mold (13) or an upper bottom mold (14) on their inner sides. The connecting plate (17) is fixedly provided with a bottom mold (13) or an upper bottom mold (14) on its inner side. The central mold (18) has a lower outer mold (15) and an upper outer mold (16) slidably arranged on its inner side. The lower bottom mold (13) and the upper bottom mold (14) are both slidably provided with push rods (12). The connecting plate (17) has a lower powder box (19) slidably arranged on its outer side. The top of the lower powder box (19) is provided with a conveying pipe (101). The lower powder box (19) is detachably provided with an ejector (102) at one end near the central mold (18). The ejector (102) has an arc-shaped concave edge on its outer side.

2. The powder metallurgy mold ejector pin structure of claim 1, wherein: The ejector (102) has a Velcro (2) on the side near the lower powder box (19). The Velcro (2) is attached to the outside of the nylon patch (21), and the nylon patch (21) is fixed to the outside of the lower powder box (19).

3. The powder metallurgy mold ejector pin structure of claim 1, wherein: The outer side of the arc-shaped concave edge is provided with a wave-shaped protrusion (3), and the outer side of the ejector (102) is symmetrically provided with grooves (31).

4. The powder metallurgy mold ejector pin structure of claim 1, wherein: The top of the connecting plate (17) is provided with a placement groove (4), which is located on the outer ring of the central mold (18). A storage box (41) is slidably provided on the inner side of the placement groove (4) for storing powder.

5. The powder metallurgy mold ejector pin structure of claim 2 wherein: The bottom of the powder box (19) has an inner sloping edge.

6. The powder metallurgy mold ejector pin structure of claim 4, wherein: The storage box (41) has a slanted edge (42) on the top inner side to increase the fit with the bottom of the powder box (19).

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