A continuous forging die jig

Abstract

This application discloses a continuous forging die fixture, comprising a bottom die and a top die. The bottom die has a first forging cavity adapted to the bottom shape of the product in a first forging process and a second forging cavity adapted to the bottom shape of the product in a second forging process; the top die has a third forging cavity and a fourth forging cavity at corresponding positions. This fixture integrates the primary forging and finishing forging stations into one unit, allowing the billet to be immediately transferred to the finishing forging chamber of the same die set for further processing after primary forging, greatly shortening the process interval. This effectively utilizes the residual heat of forging, avoiding the problem of repeated heating due to temperature drop caused by workpiece transfer. This not only significantly saves energy and reduces costs but also ensures continuous forming of the product at ideal hot working temperatures, thereby improving material filling effect, microstructure uniformity, and mechanical property consistency. Simultaneously, this integrated design reduces reliance on additional equipment, simplifies the process, and improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, and in particular relates to a continuous forging die fixture. Background Technology

[0002] In current forging production practices, a step-by-step forging process is commonly used for complex workpieces requiring multiple forging passes. This involves first completing the initial forging (e.g., forging one) on a single forging machine, then transferring the partially formed workpiece to a second or more forging machines for subsequent (e.g., forging two) finishing or final forging processes. This traditional method has several significant drawbacks: First, because each process requires independent equipment, it results in high equipment costs and a large floor space. Second, and more critically, the temperature of the semi-finished workpiece drops significantly during transfer between processes due to heat exchange with the air. To meet the temperature requirements for material plasticity in subsequent forging processes, the cooled workpiece often needs to be reheated. This process not only consumes a large amount of energy and increases production costs but can also lead to surface oxidation and decarburization, affecting the internal structure and mechanical properties of the final product. Furthermore, the repeated clamping, positioning, and transfer operations introduce the cumulative risk of human error and equipment positioning errors, hindering improvements in processing accuracy and production efficiency, and making it difficult to achieve efficient, stable, and automated continuous production. Utility Model Content

[0003] (I) Purpose of the utility model

[0004] In order to overcome the above shortcomings, the purpose of this utility model is to provide a continuous forging die fixture to solve the technical problems of traditional multi-step forging, which relies on multiple equipment and requires the transfer of workpieces between processes, resulting in serious temperature loss and repeated heating, thus causing high energy consumption, low production efficiency, poor product consistency and increased costs.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A continuous forging die fixture includes a bottom die and a top die. The bottom die is provided with a first forging cavity adapted to the bottom shape of a product in a first forging process and a second forging cavity adapted to the bottom shape of a product in a second forging process. The top die is provided with a third forging cavity adapted to the front shape of a product in the first forging process and a fourth forging cavity adapted to the front shape of a product in the second forging process, respectively, corresponding to the positions of the first and second forging cavities.

[0008] By integrating multiple forging stations into one unit, the long-distance transfer and waiting time of workpieces between processes are fundamentally eliminated. This allows the billet to immediately or quickly enter the next precision forging process after the initial forging, maximizing the use of forging residual heat and avoiding the necessary reheating due to temperature drops. This not only significantly saves energy consumption and reduces production costs, but more importantly, it ensures that the workpiece remains within the ideal hot working temperature window throughout the entire plastic forming process. This effectively improves the forging performance, filling effect, and the uniformity of the final product's microstructure and mechanical properties. Furthermore, by reducing reliance on additional equipment, the production process is simplified, and overall operational efficiency is greatly improved.

[0009] In some embodiments, the four apex corners of the bottom mold protrude upward to form positioning portions, and the four apex corners of the top mold are recessed inward to form positioning grooves for the positioning portions to be embedded in.

[0010] The precise fit between the corner positioning structure and the slot provides accurate guidance and final locking for the mold closing action of the upper and lower dies, effectively preventing lateral misalignment or rotational displacement that may occur under impact loads. This design ensures that the relative position between the primary and final forging cavities remains extremely precise, thus guaranteeing the positioning accuracy of the workpiece when switching between different workstations. This is crucial for maintaining dimensional tolerances and shape consistency when forging complex or multi-step workpieces, and also helps reduce abnormal wear of the dies, extending their service life.

[0011] In some embodiments, a guide slope is formed on the bottom mold inclined towards the center, and a matching slope adapted to the shape of the guide slope is provided on the top mold corresponding to the guide slope.

[0012] The inclined guide surfaces added to both sides of the mold body make initial contact and interact with each other during the initial mold closing stage. This actively guides and corrects the relative positions of the upper and lower molds, achieving a smooth and automatic alignment process. This effectively compensates for minor deviations that may occur during equipment operation or mold installation, further improving the stability and reliability of the mold closing action.

[0013] In some embodiments, a first fixing groove for fixing the bottom mold is formed by a circumferential recess on the side of the bottom mold, and a second fixing groove for connecting an external power device is formed by a circumferential recess on the side of the top mold.

[0014] The fixing groove structure on the side of the mold facilitates standardized installation and connection, enabling the fixture to be quickly and securely installed on different types of forging equipment. This design enhances the fixture's versatility and adaptability, simplifies the mold change process, supports flexible scheduling and efficient operation of the production line, and also ensures the stability and safety of power transmission under heavy impact loads, thus guaranteeing the smooth implementation of the continuous forging process as a whole. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the continuous forging die fixture of this utility model;

[0016] Figure 2 This is a schematic diagram of the bottom die structure in the continuous forging die fixture of this utility model;

[0017] Figure 3 This is a schematic diagram of the top die in the continuous forging die fixture of this utility model;

[0018] Figure label:

[0019] 1. Bottom mold; 11. First forging die cavity; 12. Second forging die cavity; 13. Positioning part; 14. Guide slope; 15. First fixing groove; 2. Top mold; 21. Third forging die cavity; 22. Fourth forging die cavity; 23. Positioning groove; 24. Mating slope; 25. Second fixing groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0021] This utility model provides a continuous forging die fixture, mainly comprising a bottom die 1 and a top die 2. Specifically, the bottom die 1 is integrally forged or precision cast, and its material is preferably high-strength hot work die steel, such as 5CrNiMo or H13 steel, to ensure sufficient strength, red hardness, and resistance to thermal fatigue under high temperature and high pressure. The upper surface of the bottom die 1 is machined with a first forging cavity 11 and a second forging cavity 12, wherein the shape of the first forging cavity 11 is precisely adapted to the bottom shape of the product of the first forging process (i.e., the initial forging billet), and the shape of the second forging cavity 12 is precisely adapted to the bottom shape of the product of the second forging process (i.e., the precision forging). Correspondingly, the top die 2 is also made of high-performance die steel, and its lower surface is provided with a third forging cavity 21 and a fourth forging cavity 22, whose positions are precisely corresponding to the first forging cavity 11 and the second forging cavity 12 on the bottom die 1. Specifically, the shape of the third forging die cavity 21 is adapted to the front shape of the product from the first forging process, and the shape of the fourth forging die cavity 22 is adapted to the front shape of the product from the second forging process. In this way, when the bottom die 1 and the top die 2 are closed, the first forging die cavity 11 and the third forging die cavity 21 together form the initial forging cavity, and the second forging die cavity 12 and the fourth forging die cavity 22 together form the final forging cavity, thereby integrating two forging stations into one mold.

[0022] In actual processing, the operator or robot first places the heated billet into the first forging cavity 11 of the bottom mold 1. Then, the drive unit moves the top mold 2 downwards to close with the bottom mold 1. The billet undergoes pressure and plastic deformation within the closed cavity formed by the first and third forging cavities 11 and 21, forming a preliminary forging billet. After preliminary forging, the top mold 2 moves upwards to open the mold, at which point the preliminary forging billet still maintains a high temperature. The operator or automated device then transfers it from the first forging cavity 11 to the second forging cavity 12 on the same mold set. Next, the top mold 2 moves downwards again to close the mold, and the preliminary forging billet undergoes final shaping within the finishing forging cavity formed by the second and fourth forging cavities 12 and 22, obtaining a precision forging with accurate dimensions and a dense structure. Finally, the mold is opened, and the completed finishing forging can be removed. This process is compact, with the billet completing the process steps within the mold, greatly reducing temperature drop during the transfer process.

[0023] Furthermore, to achieve precise alignment and reliable mold closing between the bottom mold 1 and the top mold 2, positioning parts 13 are formed by protruding upwards at the four corners of the bottom mold 1. These positioning parts 13 are preferably rectangular boss structures. At the corresponding positions of the four corners of the top mold 2, positioning grooves 23 are formed by recessing inwards for the positioning parts 13 to be inserted. The positioning parts 13 and the positioning grooves 23 are fitted with a small clearance; for example, the clearance on one side can be controlled within a few tenths of a millimeter. It is worth noting that the height of the positioning parts 13 is slightly lower than the contact surface between the top mold 2 and the bottom mold 1 after mold closing, thus ensuring that the mold closing force is ultimately borne by the main mold plane, while the positioning parts 13 mainly serve a guiding and error-preventing function. This four-corner positioning design effectively prevents lateral forces generated during mold closing from causing lateral displacement or rotation of the mold, ensuring the positional accuracy between multiple forging cavities.

[0024] Based on this, to improve the smoothness and guidance of the mold closing process, guide slopes 14 inclined towards the mold center are provided on both sides of the bottom mold 1, located in the first forging cavity 11 and the second forging cavity 12. Correspondingly, mating slopes 24 that perfectly match the shape of the guide slopes 14 are machined on both sides of the top mold 2. These guide slopes 14 and mating slopes 24 contact the forging cavity in the initial stage of the mold closing action. Preferably, the inclination angle of the slope is between five and fifteen degrees, for example, a ten-degree inclination angle, to achieve a smooth guiding function. This design allows the upper and lower molds to automatically correct any possible minor alignment errors during the closing process, guiding the mold to close accurately, thereby avoiding direct collision or damage to the cavity edges and playing an important protective role for the core forming parts of the mold.

[0025] Regarding the installation and fixing of the mold, a first fixing groove 15 is formed by a circumferential recess on the side of the bottom mold 1. This groove has a rectangular or trapezoidal cross-section and surrounds the side wall of the bottom mold 1. Similarly, a second fixing groove 25 is also formed by a circumferential recess on the side of the top mold 2. The first fixing groove 15 is used to securely fix the bottom mold 1 to the worktable of the forging equipment with the help of a pressure plate, bolts, or special fixtures. The second fixing groove 25 is used to connect an external power unit, such as the slide of a press, usually through T-bolts or similar connectors for reliable connection. Preferably, the depth and width of the fixing grooves are calculated to ensure sufficient strength under huge impact loads and to avoid stress concentration. This standardized groove design allows the fixture to be quickly and stably installed on various models of forging presses, enhancing its versatility and adaptability.

[0026] Preferably, the continuous forging die fixture of this invention can be applied to various scenarios that require multi-step forging, such as the production of parts like golf ball heads, connecting rods, and gear blanks.

[0027] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A continuous forging die fixture, characterized in that, The product includes a bottom mold (1) and a top mold (2). The bottom mold (1) is provided with a first forging cavity (11) adapted to the bottom shape of the product of the first forging process and a second forging cavity (12) adapted to the bottom shape of the product of the second forging process. The top mold (2) is provided with a third forging cavity (21) adapted to the front shape of the product of the first forging process and a fourth forging cavity (22) adapted to the front shape of the product of the second forging process, respectively, corresponding to the positions of the first forging cavity (11) and the second forging cavity (12).

2. The continuous forging die fixture according to claim 1, characterized in that, The four corners of the bottom mold (1) protrude upward to form a positioning part (13), and the four corners of the top mold (2) are recessed inward to form a positioning groove (23) for the positioning part (13) to be embedded.

3. The continuous forging die fixture according to claim 1, characterized in that, The bottom mold (1) is inclined towards the center to form a guide slope (14), and the top mold (2) is provided with a matching slope (24) that is adapted to the shape of the guide slope (14).

4. The continuous forging die fixture according to claim 1, characterized in that, The bottom mold (1) has a circumferentially recessed side to form a first fixing groove (15) for fixing the bottom mold (1), and the top mold (2) has a circumferentially recessed side to form a second fixing groove (25) for connecting an external power device.

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