A spring ejector structure suitable for compound blanking dies

Abstract

This utility model belongs to the technical field of cold stamping forming process for metal parts, and discloses a spring ejector structure suitable for composite blanking dies. This spring ejector structure uses multiple double-headed screws to connect a moving ejector plate and a stationary ejector plate. An elastic element fitted outside the screws is placed between the two plates. Simultaneously, a through-aligned ejection channel is formed between the double-headed screw array, at the center of the moving and stationary plates, and at the die base and the inner hole of the piercing punch. During stamping, the ejector plate fitted outside the piercing punch presses down on the moving ejector plate through the ejector screws, compressing the elastic element to store energy. During the return stroke, the elastic element releases energy, pushing the moving ejector plate upwards, which in turn drives the ejector plate to complete the ejection action through the ejector screws. The waste generated during stamping can be directly and vertically discharged through the through-connected ejection channel. This structure completely eliminates the blockage of waste by traditional solid rubber spring ejectors, ensuring smooth and automatic waste discharge.

Description

Technical Field

[0001] This utility model belongs to the technical field of cold stamping forming process for metal parts, specifically relating to a spring ejector structure suitable for composite blanking dies. Background Technology

[0002] Currently, with the continuous development of cold stamping technology and the ever-increasing demands for part quality, the quality of the die has become a crucial prerequisite for ensuring part quality. Its structural quality directly affects the application effect of stamping technology and the final quality of the parts. To improve production efficiency while ensuring part quality, the industry is constantly developing composite die structures to shorten the production cycle by reducing the number of stamping operations. The widespread application of composite dies not only increases stamping capacity but also effectively reduces the probability of part damage from impacts, improves the coaxiality and surface quality of parts, and lowers production costs, providing strong support for enhancing the market competitiveness of stamped parts.

[0003] However, in composite mold structures, most composite molds have the problem of scrap falling off. Traditional rubber ejectors are solid structures, which prevents the scrap generated by the mold stamping from falling off smoothly. This severely restricts the full utilization of the efficiency of composite blanking molds, making it difficult to achieve the expected effect of one-time stamping of two-in-one or multi-in-one molds. It also has an adverse effect on shortening the production cycle of cold stamped parts, improving surface quality and production efficiency.

[0004] In summary, the existing technology has the technical problem that traditional rubber ejectors cannot meet the requirement of smooth discharge of waste material from composite blanking molds. Utility Model Content

[0005] This utility model provides a spring ejector structure suitable for composite blanking molds. By adopting this spring ejector structure, the requirement for smooth discharge of waste material from composite blanking molds can be met.

[0006] To achieve the above objectives, the present invention adopts the following technical content: A spring ejector structure suitable for composite blanking dies includes multiple double-ended screws; The double-ended screw is fitted with a dynamic discharge pad and a static discharge pad from top to bottom. One end of the double-ended screw is connected to the mold base of the composite blanking mold, and the other end is connected to an adjusting nut. An elastic element is provided between the dynamic unloading pad and the static unloading pad, and the elastic element is sleeved on the double-ended screw. The composite blanking die has a stripper plate for positioning the blanking piece circumferentially outside the punch. The bottom of the unloading plate is connected to multiple unloading screws; The unloading screw passes through the mold base and then abuts against the dynamic unloading pad; Discharge holes are formed between multiple double-ended screws. A central hole is provided in the middle of the moving discharge pad and the stationary discharge pad. The discharge holes, the two central holes, the central hole of the mold base, and the inner hole of the flipping punch are aligned to form a discharge channel for waste material discharge.

[0007] Furthermore, the elastic element is made of polyurethane rod.

[0008] Furthermore, the elastic element is a spring.

[0009] Furthermore, the multiple double-headed screws are evenly distributed along the circumference of the mold base.

[0010] Furthermore, the plurality of the unloading screws are evenly inserted along the circumference of the mold base.

[0011] Furthermore, the adjusting nut is connected to the end of the double-ended screw via a thread.

[0012] Furthermore, the unloading plate has a stepped surface, which is flush with the top surface of the turning punch; the stepped surface is used to position the sheet material.

[0013] Furthermore, the diameter of the central hole of the dynamic unloading pad is equal to that of the static unloading pad.

[0014] Furthermore, the central hole of the mold base is larger than the diameter of the inner hole of the flanging punch.

[0015] Furthermore, a rubber gasket is provided between the dynamic unloading pad and the unloading screw.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a spring ejector structure suitable for composite blanking dies. The structure employs multiple double-headed screws that connect a moving ejector plate and a stationary ejector plate. An elastic element, fitted outside the screws, is placed between the two plates. Simultaneously, a through-aligned ejection channel is formed between the double-headed screw array, at the center of the moving and stationary plates, and at the die base and the inner hole of the piercing punch. During stamping, the ejector plate fitted outside the piercing punch presses down on the moving ejector plate via the ejector screws, compressing the elastic element to store energy. During the return stroke, the elastic element releases energy, pushing the moving ejector plate upwards, which in turn drives the ejector plate to complete the ejection action via the ejector screws. The waste material generated during stamping can be directly and vertically discharged through the through-connected ejection channel. This structure completely eliminates the blockage of waste material by traditional solid rubber spring ejectors, ensuring smooth and automatic waste discharge; it guarantees continuous and efficient operation of the composite blanking die, achieving one-time stamping forming; it significantly improves the production efficiency and surface quality of cold-stamped parts, and shortens the production cycle.

[0017] Preferably, in this invention, a polyurethane rod is selected as the elastic element, which has higher resistance to compression fatigue compared to traditional solid rubber. Its internal microporous structure can absorb impact vibrations, maintain stable elastic force output during long-term high-frequency compression, and form an efficient force transmission path in conjunction with the double-ended screw, extending the service life of key components.

[0018] Preferably, in this invention, a spring scheme is used to provide elastic potential energy. The metal spring has precise linear elastic force characteristics, and can be flexibly adapted to different punching force requirements through selection. Moreover, its performance degradation under high temperature conditions is much lower than that of polymer materials, which enhances the adaptability of the spring top device in harsh production environments.

[0019] Preferably, in this utility model, a double-headed screw is evenly distributed around the circumference. This symmetrical layout makes the dynamic unloading pad evenly stressed, avoiding tilting and jamming due to uneven load. At the same time, it optimizes the load distribution of the mold base, which is conducive to maintaining the concentricity and structural stability of the unloading channel.

[0020] Preferably, in this invention, the unloading screws are evenly distributed circumferentially to ensure that the lifting height of each point on the unloading plate is consistent. This design eliminates the torsional load generated during the unloading process, prevents the material sheet from shifting, and ensures the dimensional accuracy of the formed parts and the absence of surface scratches.

[0021] Preferably, in this invention, a threaded connection adjusting nut is used to provide the spring-loaded device with precise pre-pressure adjustment. By tightening the nut, the initial compression of the elastic element can be changed, flexibly adapting to the stamping requirements of materials of different thicknesses, and enabling rapid adjustment of process parameters without replacing parts.

[0022] Preferably, in this invention, the design of the stepped surface positioning structure enables the stripper plate to have both positioning and support functions. The stepped surface is flush with the top surface of the punch to form a precise positioning reference, effectively suppressing the movement of the sheet metal during stamping and significantly improving the accuracy of the hole position and the quality of the part contour.

[0023] Preferably, in this invention, the center holes of the moving and stationary pads are of equal diameter. This design ensures that there is no abrupt change in cross-section when the waste material passes through the joint between the two pads, eliminates the risk of waste material jamming, and ensures the smooth flow of the unloading channel throughout the entire process, making it particularly suitable for high-speed continuous stamping operations.

[0024] Preferably, in this invention, the center hole of the base is larger than the inner hole of the punch. This redundant design provides a margin of error for the falling waste material, which can cope with slight deformation or misalignment of the waste material, prevent the waste material from clogging at the final outlet, and improve the reliability of system operation.

[0025] Preferably, this invention includes a rubber pad buffer structure. Its shock-absorbing properties effectively attenuate the mechanical impact during unloading, protect the unloading screw threads from plastic deformation, reduce equipment operating noise, and extend the service life of moving parts. Attached Figure Description

[0026] Figure 1 A schematic diagram of a spring ejector structure suitable for a composite blanking die provided in this embodiment of the present invention; Figure 2 A schematic diagram of the mold opening state of an ejector structure suitable for a composite blanking mold provided in this embodiment of the utility model; Figure 3 A schematic diagram of the mold closing state of an ejector structure suitable for a composite blanking mold provided in this embodiment of the utility model; Figure 4 A schematic diagram of another ejector structure suitable for composite blanking molds provided in this embodiment of the present utility model.

[0027] Figure label: 1. Sheet material; 2. Punching punch; 3. Flanging punch; 4. Stripper plate; 5. Stripper screw; 6. Moving stripper pad; 7. Double-ended screw; 8. Polyurethane rod; 9. Static stripper pad; 10. Adjusting nut; 11. Mold base; 12. Spring. Detailed Implementation

[0028] To make the technical problem solved by this utility model, the technical solution, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing 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, and therefore should not be construed as a limitation of this utility model.

[0033] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] As mentioned in the background section, in composite mold structures, most composite molds have waste material falling off. However, traditional rubber ejectors are solid structures, and the waste material stamped by the mold cannot fall off and be discharged.

[0036] To address the aforementioned issues, this embodiment provides a spring ejector structure suitable for composite blanking dies. Based on the structural characteristics of the composite blanking die and the diameter of the blanking hole on the press worktable, this spring ejector structure is designed to ensure smooth unloading while also facilitating the discharge of scrap material, achieving a perfect combination of unloading and discharge. This structure enables the composite blanking die to achieve excellent stamping performance, enabling one-time stamping of two-in-one or multi-in-one dies. This shortens the stamping production cycle of such cold-stamped parts, improves the surface quality of parts and stamping production efficiency, continuously improves stamping technology, and provides strong support for increasing enterprise production capacity.

[0037] like Figure 1 As shown, this embodiment provides a spring ejector structure suitable for composite blanking molds, including multiple double-headed screws 7. In this embodiment, three double-headed screws 7 are used. The three double-headed screws 7 are evenly arranged along the circumference of the mold base 11. Each double-headed screw 7 is fitted with a dynamic unloading pad 6 and a static unloading pad 9 from top to bottom. Both the dynamic unloading pad 6 and the static unloading pad 9 have a central hole with the same diameter.

[0038] In this embodiment, one end of the double-ended screw 7 is fixedly connected to the mold base 11 by a thread, and the other end is connected to an adjusting nut 10 by a thread. An elastic element is provided between the dynamic discharge pad 6 and the static discharge pad 9, and this elastic element is sleeved on the double-ended screw 7. This elastic element is a polyurethane rod 8. The adjusting nut 10 is used to adjust the compression of the polyurethane rod 8.

[0039] In this embodiment, the circumferentially outer surface of the piercing punch 3 of the composite blanking die is fitted with a stripper plate 4. The stripper plate 4 is used to position the sheet 1. A stepped surface is provided inside the plate, which is flush with the top surface of the piercing punch 3 to position the sheet 1.

[0040] The bottom of the unloading plate 4 is connected to multiple unloading screws 5. In this embodiment, three screws are used. The unloading screws 5 are evenly inserted along the circumference of the mold base 11 and pass through the mold base 11 to abut against the moving unloading pad 6. A rubber gasket is provided between the moving unloading pad 6 and the unloading screws 5 to increase the service life of both.

[0041] For example, a discharge hole is formed between the two double-ended screws 7. The discharge hole, the center hole of the moving discharge pad 6, the center hole of the stationary discharge pad 9, the center hole of the mold base 11, and the inner hole of the flipping punch 3 are aligned to form a discharge channel for waste material discharge. The center hole of the mold base 11 is larger than the diameter of the inner hole of the flipping punch 3.

[0042] Therefore, the ejector structure for composite blanking dies provided in this embodiment changes the traditional solid rubber ejector structure. It employs a moving and a stationary ejector plate, with a blanking hole in the center of each plate (two center holes). An elastic element is installed between the moving and stationary ejector plates, simultaneously transmitting the downward pressure of the ejector screw to the moving ejector plate. The moving ejector plate then compresses the elastic element, storing energy; that is, the ejector screw generates elastic potential energy. When the die is stamping, the scrap material falls and is discharged from the center holes of the base, the moving ejector plate, and the stationary ejector plate. Subsequently, when the die is open, the elastic element resets, completing the ejection action. This design maximizes the effectiveness of the innovative ejector structure.

[0043] The features of this embodiment are as follows: First, the structure of the moving and stationary unloading pads of the ejector determines the upper and lower installation positions of the moving and stationary unloading pads; second, the size of the center hole of the pad is designed according to the size of the scrap part. The outer diameter of the moving and stationary pads is designed according to the size of the punch press blanking hole, and the diameter of the elastic element is matched. At the same time, the number of elastic elements is matched according to the magnitude of the stamping blanking force of the part to ensure the stability of the stamping quality of the part.

[0044] like Figure 2 and Figure 3As shown, in the mold open state, sheet 1 is placed into stripper plate 4 and positioned by the stepped surface. Subsequently, punching punch 2 descends and works together with flanging punch 3 to punch sheet 1. The resulting waste is discharged from the inner hole of flanging punch 3, passing sequentially through the center hole of mold base 11, the center hole of moving stripper plate 6, and the center hole of stationary stripper plate 9, and finally discharged from the unloading channel. Punching punch 2 continues to descend, while stripper plate 4 moves downward, pushing stripper screw 5 to press moving stripper plate 6, causing moving stripper plate 6 to slide downward on double-ended screw 7. The upper end of double-ended screw 7 is fixed in the threaded hole of mold base 11, and the lower end of double-ended screw 7 passes through stationary stripper plate 9 and is locked with adjusting nut 10. The polyurethane rod 8 is compressed to accumulate elastic potential energy until the mold closes and the forming is completed. Subsequently, during the mold opening process, the polyurethane rod 8 releases its elastic force upward, pushing the moving stripper plate 6 to return to its original position. This, in turn, drives the stripper plate 4 upward via the stripper screw 5, removing the sheet 1 from the outer cylindrical surface of the flipping punch 3 and ejecting it, thus completing the entire stripping process. This ejector structure ensures the smooth discharge and unloading of stamped parts, guaranteeing the stability of the composite stamping process.

[0045] like Figure 4 As shown, this embodiment also provides another ejector structure suitable for composite blanking dies. Based on the ejector structure provided in the above embodiment, the difference is that the elastic element in this embodiment is a spring 12. The spring 12 is sleeved on the double-ended screw 7. The metal spring 12 has precise linear elasticity characteristics and can be flexibly adapted to different stamping pressure requirements through selection. Moreover, its performance degradation under high temperature conditions is much lower than that of polymer materials, which further enhances the adaptability of the ejector in harsh production environments.

[0046] In summary, this utility model provides a spring ejector structure suitable for composite blanking dies, which has the following advantages compared with existing spring ejector structures: This ejector structure overcomes the drawbacks of traditional solid rubber ejectors, satisfying the material discharge and unloading characteristics of composite blanking dies. It removes obstacles to the widespread application of composite blanking dies, shortens the parts production cycle, improves parts surface quality and stamping efficiency, and reduces the probability of damage to stamped parts, achieving twice the result with half the effort. Simultaneously, this structure significantly reduces equipment and labor costs, substantially lowering the production cost of stamped parts and providing a strong guarantee for enhancing the market competitiveness of stamped parts.

[0047] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A spring ejector structure suitable for composite blanking dies, characterized in that, Includes multiple double-ended screws (7); The double-headed screw (7) is fitted with a dynamic unloading pad (6) and a static unloading pad (9) from top to bottom. One end of the double-headed screw (7) is connected to the mold base (11) of the composite blanking mold, and the other end is connected to an adjusting nut (10). An elastic element is provided between the dynamic unloading pad (6) and the static unloading pad (9), and the elastic element is sleeved on the double-headed screw (7); The circumferential outer side of the piercing punch (3) of the composite blanking die is fitted with a stripper plate (4) for positioning the material piece (1). The bottom of the unloading plate (4) is connected to multiple unloading screws (5); The unloading screw (5) passes through the mold base (11) and then abuts against the moving unloading pad (6); Discharge holes are formed between multiple double-headed screws (7). A central hole is provided between the moving discharge pad (6) and the stationary discharge pad (9). The discharge holes, the two central holes, the central hole of the mold base (11), and the inner hole of the flipping punch (3) are aligned to form a discharge channel for waste material discharge.

2. The ejector structure for a composite blanking die according to claim 1, characterized in that, The elastic element is made of polyurethane rod (8).

3. The ejector structure for a composite blanking die according to claim 1, characterized in that, The elastic element is a spring (12).

4. The ejector structure for a composite blanking die according to claim 1, characterized in that, Multiple double-headed screws (7) are evenly distributed along the circumference of the mold base (11).

5. The ejector structure for a composite blanking die according to claim 1, characterized in that, Multiple discharge screws (5) are evenly inserted along the circumference of the mold base (11).

6. The ejector structure for a composite blanking die according to claim 1, characterized in that, The adjusting nut (10) is connected to the end of the double-ended screw (7) by a thread.

7. The ejector structure for a composite blanking die according to claim 1, characterized in that, The unloading plate (4) has a stepped surface, which is flush with the top surface of the piercing punch (3); the stepped surface is used to position the sheet (1).

8. The ejector structure for a composite blanking die according to claim 1, characterized in that, The diameter of the central hole of the dynamic unloading pad (6) is the same as that of the static unloading pad (9).

9. The ejector structure for a composite blanking die according to claim 1, characterized in that, The central hole of the mold base (11) is larger than the diameter of the inner hole of the flipping punch (3).

10. The ejector structure for a composite blanking die according to claim 1, characterized in that, A rubber gasket is provided between the dynamic unloading pad (6) and the unloading screw (5).

Images