A type of ring fitting forming mold

Abstract

This utility model provides a forming mold for lifting ring fittings, including a pre-forging mold and a final forging mold. The pre-forging mold includes a first half-mold, a second half-mold, and an upper punch. After the two half-molds are closed, a pre-forming mold cavity is formed that matches the outer contour of the lifting ring fitting. The pre-forming mold cavity includes an end cavity, a connecting rod cavity, and a lifting ring cavity connected sequentially from top to bottom. The lifting ring cavity corresponds to the outer wall contour of the lifting ring fitting, and the end cavity extends upward with a through hole. The final forging mold includes a matching bottom mold and a cover mold. The bottom mold has a final forming mold cavity with the same shape as the pre-forming mold cavity. The cover mold has a protrusion corresponding to the inner wall contour of the lifting ring fitting at the lifting ring cavity of the final forming mold cavity. After the bottom mold and the cover mold are closed, the lifting ring cavity of the final forming mold cavity corresponds to the outer wall contour and the inner wall contour of the lifting ring fitting. By adopting the technical solution of this utility model, the production efficiency of the lifting ring fitting forming process can be improved, the material utilization rate can be increased, the production cost can be reduced, and the yield rate can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of power fittings manufacturing technology, specifically to a forming mold for lifting ring fittings. Background Technology

[0002] Electrical fittings are metal accessories that connect and combine various devices in a power system, serving to transmit mechanical loads, electrical loads, and provide certain protective functions. Lifting eyelets are a common type of fitting for composite insulators, such as... Figure 1 As shown, the shape and structure of the lifting eyelet are characterized by a large tail diameter and a corresponding large cross-section, while the cross-section of the ring body is small, which places high demands on the bar material.

[0003] Currently, lifting eyelet fittings are typically manufactured by hot forging round steel bars, such as... Figure 2 As shown, the main manufacturing process includes heating + pre-forging + final forging + partial punching + overall trimming, which includes multiple processes such as partial upsetting, partial flattening, and partial punching. This method has the advantages of relatively mature forging technology and relatively simple molds, and is the main manufacturing method adopted by manufacturers of lifting ring fittings. However, this method has the disadvantages of many and cumbersome processes, and the punching and trimming process generates a lot of leftover material, resulting in serious waste of raw materials and low material utilization. The overall production cost is also high. Moreover, various defects are prone to appear on the inner ring surface of the lifting ring fitting products.

[0004] Other forming processes for lifting eye fittings also exist in the existing technology, but they basically follow the forging mode of pre-forging + final forging + punching + trimming. Therefore, the manufacturing process of lifting eye fittings still needs to be optimized. Utility Model Content

[0005] To better address the aforementioned issues, this utility model provides a forming mold for lifting eyelet fittings, which can improve the production efficiency of the lifting eyelet fitting forming process, increase material utilization, reduce production costs, and ensure a high yield rate.

[0006] To achieve the above objectives, this utility model provides a forming mold for a lifting ring fitting, including a pre-forging mold and a final forging mold. The pre-forging mold includes a first half-mold, a second half-mold, and an upper punch. After the first half-mold and the second half-mold are closed, a pre-forming mold cavity that matches the outer contour of the lifting ring fitting is formed. The pre-forming mold cavity includes an end cavity, a connecting rod cavity, and a lifting ring cavity connected sequentially from top to bottom. The lifting ring cavity corresponds to the outer wall contour of the lifting ring of the lifting ring fitting. The end cavity extends upward with a through hole, the inner diameter of which is equal to the outer diameter of the punch section of the upper punch. The final forging mold includes a matching bottom mold and a cover mold. The bottom mold has a final forming mold cavity with the same shape as the pre-forming mold cavity. The cover mold has a protrusion corresponding to the inner wall contour of the lifting ring fitting at the lifting ring cavity of the final forming mold cavity. After the bottom mold and the cover mold are closed, the lifting ring cavity of the final forming mold cavity corresponds to the outer wall contour and the inner wall contour of the lifting ring fitting.

[0007] Optionally, the first half-mold and the second half-mold are symmetrical about the center plane of the preformed cavity.

[0008] Optionally, the bottom mold includes a first half-bottom mold and a second half-bottom mold, and the first half-bottom mold and the second half-bottom mold are joined together to form the final molding cavity.

[0009] Optionally, the final forming cavity has an opening at the mating surface of the bottom mold and the top mold, with the edge of the opening corresponding to the area between the outer wall and the inner wall of the lifting ring.

[0010] Optionally, the top of the upper punch has a connection structure that connects to the drive mechanism.

[0011] The lifting ring fitting forming mold of this utility model has a simple structure of pre-forging mold and final forging mold. It can pre-forge round steel billets in one step, and then press the pre-forged parts for final forging. There is no need for local upsetting or flattening in the pre-forging stage, and no need for local punching after final forging. This effectively improves the overall efficiency of the lifting ring fitting forming process and reduces production costs. In addition, it improves material utilization and solves the problem of serious waste of raw materials in the existing lifting ring fitting forming process.

[0012] This lifting ring fitting forming mold has the advantages of simple structure, reliable performance and convenient operation. It improves the existing process of opening pre-forging cavities on multiple molds and making blanks in multiple processes to one-time pre-forging, which can reduce process costs by 30%, increase material utilization by 15%, and the outer contour and inner ring surface of the final forged lifting ring fitting product are less prone to defects, thus ensuring the product processing yield. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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.

[0014] Figure 1 This is a schematic diagram of the structure of the lifting ring fitting according to an embodiment of the present utility model; Figure 2 A schematic diagram of the forging process of existing lifting eye fittings; Figure 3 This is a schematic diagram of the structure of the pre-forging die (half-die) according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the final forging die (bottom die) according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the molding process of the lifting ring fitting mold according to an embodiment of the present utility model.

[0015] Figure label: 1. Pre-forging die; 2. Bottom die; 3. End cavity; 4. Connecting rod cavity; 5. Lifting ring cavity; 6. Upper punch; 7. Round steel billet; 8. Preformed part; 9. Final formed part. Detailed Implementation

[0016] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the implementations of the base model disclosed below.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] like Figure 3 and Figure 4 As shown, the forming mold for the lifting ring fitting in this embodiment of the utility model includes a pre-forging mold 1 and a final forging mold. The pre-forging mold 1 includes a first half mold, a second half mold, and an upper punch 6. After the first half mold and the second half mold are closed, a pre-forming mold cavity that matches the outer contour of the lifting ring fitting is formed. The pre-forming mold cavity includes an end cavity 3, a connecting rod cavity 4, and a lifting ring cavity 5 connected sequentially from top to bottom. The lifting ring cavity 5 corresponds to the outer contour of the lifting ring of the lifting ring fitting. The end cavity 3 extends upward with a through hole, the inner diameter of which is equal to the outer diameter of the punch section of the upper punch 6. The final forging mold includes a matching bottom mold 2 and a cover mold (not shown in the figure). The bottom mold 2 has a final forming mold cavity with the same shape as the pre-forming mold cavity. The cover mold has a protrusion corresponding to the inner contour of the lifting ring fitting at the lifting ring cavity of the final forming mold cavity. After the bottom mold 2 and the cover mold are closed, the lifting ring cavity of the final forming mold cavity corresponds to the outer contour of the lifting ring and the inner contour of the lifting ring of the lifting ring fitting.

[0019] In this ring fitting forming mold, referring to the end, connecting rod, and ring of the ring fitting, the preforming mold cavity includes an end cavity 3, a connecting rod cavity 4, and a ring cavity 5. Here, the inner diameter of the end cavity 3 is larger than the inner diameter of the connecting rod cavity 4, and the inner diameter of the connecting rod cavity 4 is larger than the diameter of the round steel billet 7. The inner diameter of the through hole is the same as the inner diameter of the end cavity 3 and equal to the diameter of the punch section (punch rod) of the upper punch 6. The through hole has a certain length, allowing the round steel billet 7 to be inserted into the preforming mold cavity through the through hole, and the upper punch 6 to be inserted into the through hole to press down on the round steel billet 7, thus pre-forging the round steel billet 7. This pre-forging mold adopts a Haver mold form. The first half and the second half of the mold are symmetrical about the center plane of the preforming mold cavity length direction (the connection direction of the end cavity, connecting rod cavity, and ring cavity, that is, the length direction of the ring fitting). The interior of both half of the mold has a groove, which is half of the preforming mold cavity. After the mold is closed, a complete preforming mold cavity is formed. The outline of the pre-forged preform 8 is consistent with that of the lifting eye fitting product, with the lifting eye portion being a flat plate. Compared to the existing forging process of lifting eye fittings, where the pre-forging cavity is opened on multiple sets of dies and requires multiple processes such as local upsetting and local flattening, this pre-forging die can pre-forge the round steel billet in one step, which can effectively improve production efficiency and reduce process costs.

[0020] The final forming cavity in the bottom mold of the final forging die has the same shape as the preforming cavity, and also includes the connected end cavity, connecting rod cavity, and lifting ring cavity. After the preformed part 8 is placed into the final forming cavity, the flat plate at the lifting ring can be forged again using the cover mold to obtain the final forged lifting ring hardware product. Here, the bottom mold includes a first half-bottom mold and a second half-bottom mold. The first half-bottom mold and the second half-bottom mold are symmetrical about their center planes along the length direction of the final forming cavity. After the first half-bottom mold and the second half-bottom mold are closed, they form the internal final forming cavity. This type of bottom mold makes it easy to place the preformed part 8 into the final forming cavity in the bottom mold 2. The final forming cavity is located inside the mating surface of the bottom mold and the top mold, meaning the pre-forged blank can be completely placed into the bottom mold. The final forming cavity has an opening at the mating surface, corresponding to the lifting ring of the lifting ring fitting. The edge of the opening is located between the outer and inner walls of the lifting ring, covering the edge of the flat plate at the lifting ring location of the blank and exposing the position of the flat plate corresponding to the inner wall of the lifting ring, facilitating the smooth pressing of the lifting ring by the protrusions on the top mold. In practical applications, the size of the lifting ring cavity in the final forming cavity can be equal to or slightly larger than the size of the lifting ring cavity in the pre-forming cavity. This prevents excessive material leakage from the final forming cavity when the flat plate is pressed by the bottom mold. The lifting ring fitting product can be obtained by simply trimming the edges of the final forged fitting, avoiding material waste and simplifying the process.

[0021] According to an exemplary embodiment of this utility model, in the forming mold of the lifting ring fitting, the pre-forging mold and the final forging mold can be used with a driving mechanism that provides driving force, such as a hydraulic press or an electric screw press. The top end of the upper punch 6 of the pre-forging mold can have a connecting structure connected to the driving mechanism. For example, this connecting structure is used to connect the upper punch 6 to the end of the telescopic end of the hydraulic press, so that the hydraulic press can drive the upper punch to move vertically and press the round steel billet. The outer end of the cover mold of the final forging mold can have a connecting structure connected to the driving mechanism. For example, this connecting structure is used to connect the cover mold to the end of the telescopic end of the press, so that the press can drive the cover mold to move laterally and press the flat plate at the lifting ring with the protrusion of the cover mold. In addition, the pre-forging mold and the final forging mold also need to be used with a mold fixing device (e.g., a mold sleeve). The fixing device of the pre-forging mold can be set below the telescopic end of the hydraulic press, and the fixing device of the final forging mold can be set in the extension direction of the telescopic end of the press.

[0022] In one alternative implementation, such as Figure 5 As shown, when using this lifting ring fitting forming mold for lifting ring fitting forming operations, firstly, in the preparation step, the first and second halves of the pre-forging mold are placed into the mold sleeve and accurately positioned. The upper punch 6 is connected to the hydraulic press. The bottom mold 2 (including two half bottom molds) of the final forging mold is placed into the mold sleeve and accurately positioned. The cover mold is connected to the press. Then, in the pre-forming step, the pre-forging mold is closed, and the round steel billet 7 (preheated) is vertically placed into the pre-forging mold through the upper through hole. The upper punch 6 is driven by the hydraulic press to push into the lower mold, causing the punch to press down and realize the pre-forging of the outer contour of the lifting ring fitting. Then, the upper punch is raised, the mold is opened, and the pre-formed part 8 is taken out. Then, in the final forming step, the pre-formed part 8 is placed into the bottom mold 2 and the mold is closed. The cover mold is driven by the press to close with the bottom mold, causing the protrusion to press the pre-formed part, realizing the final forging of the inner and outer contours of the lifting ring fitting. Then, the mold is opened, the final formed part 9 is taken out, and the subsequent edge trimming process is performed to obtain the lifting ring fitting product. Repeating the pre-forming and final forming steps allows for mass production of lifting ring fittings.

[0023] In practical applications, the pre-forging die and final forging die in the ring fitting forming mold of this utility model embodiment can be designed according to the specifications and models of the ring fittings to be processed in the actual working conditions, and can be realized using conventional mold materials required in the prior art. Furthermore, other equipment or components can be set in the ring fitting forming mold, or the actual installation positions of each equipment or component can be adjusted to realize the actual application or other functions of the forming mold; according to implementation needs, the various components of the forming mold described in this utility model embodiment can be disassembled into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of this utility model embodiment.

[0024] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A forming mold for lifting eyelet fittings, characterized in that, The device includes a pre-forging die and a final forging die. The pre-forging die includes a first half-die, a second half-die, and an upper punch. After the first half-die and the second half-die are closed, they form a pre-forming die cavity that matches the outline of the lifting ring fitting. The pre-forming die cavity includes an end cavity, a connecting rod cavity, and a lifting ring cavity connected sequentially from top to bottom. The lifting ring cavity corresponds to the outer wall outline of the lifting ring of the lifting ring fitting. The end cavity extends upward with a through hole, and the inner diameter of the through hole is equal to the outer diameter of the punch section of the upper punch. The final forging die includes a matching bottom die and a top die. The bottom die has a final forming cavity with the same shape as the preforming die cavity. The top die has a protrusion corresponding to the inner wall contour of the lifting ring fitting at the lifting ring cavity of the final forming die cavity. After the bottom die and the top die are closed, the lifting ring cavity of the final forming die cavity corresponds to the outer wall contour and inner wall contour of the lifting ring fitting.

2. The forming mold for a lifting ring according to claim 1, characterized in that, The first half-mold and the second half-mold are symmetrical about the center plane of the preformed cavity.

3. The forming mold for a lifting ring according to claim 1, characterized in that, The bottom mold includes a first half-bottom mold and a second half-bottom mold. The first half-bottom mold and the second half-bottom mold are joined together to form the final molding cavity.

4. The forming mold for a lifting ring according to claim 3, characterized in that, The final forming cavity has an opening at the mating surface of the bottom mold and the top mold, and the edge of the opening corresponds to the area between the outer wall and the inner wall of the lifting ring.

5. The forming mold for a lifting ring according to claim 1, characterized in that, The top of the upper punch has a connection structure that connects to the drive mechanism.

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