Upward punching progressive die structure

Abstract

The utility model discloses a progressive die structure capable of punching upwards, which belongs to the technical field of machining, comprises a lower die, an upper die, an upper die holder, a stripper plate and a punch component, and is characterized in that the punch component is mounted on the lower die and is provided with a punch which moves from bottom to top to punch a conical groove of a workpiece, and the punch is mounted on the upper die holder. The discharging plate is provided with a discharging vertical hole corresponding to the punch and a discharging transverse hole communicated with the discharging vertical hole, the discharging transverse hole penetrates through the discharging plate, and one end of the discharging transverse hole is connected with a blower device. According to the structure, the mode of punching from bottom to top is adopted in the progressive die, the structural strength of the female die is remarkably improved, the problem that a thin wall loses efficacy due to the fact that the female die is attached to a special-shaped face is solved, meanwhile, the die machining technology is simplified, and the stability and durability of the die in high-speed continuous punching are guaranteed in combination with the effective waste discharging design.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, and in particular relates to a progressive die structure for upward punching. Background Technology

[0002] Punching is a common process in stamping dies. In progressive dies, punching is an essential step. Usually, the punching direction needs to be consistent with the punching direction of the press, punching from top to bottom. After punching, the waste material is discharged from the bottom of the die. In the production process of progressive dies, the timely discharge of waste material is particularly important because the press needs to produce continuously and efficiently. However, due to the different shape characteristics and functions of different products, a single punching direction is sometimes not enough to meet the strength requirements of the parts. Therefore, it is necessary to add a separate punching die to achieve punching in different directions.

[0003] by Figure 1 , Figure 2 and Figure 3 Taking product 1 as an example, the overall structure of this product requires the stamping direction to be fixed from top to bottom to ensure the accuracy of the forming dimensions and subsequent processes. Under this structural constraint, the area below a certain punching position is a conical slope. If the traditional top-down punching method, which is consistent with the overall stamping direction, is used, the corresponding lower die insert 2 needs to be fitted to this conical surface. Due to the large local inclination angle of the conical surface, the sidewall of the lower die insert at the punching position will be cut very thin in some areas, resulting in insufficient structural strength. It is very easy to crack, deform, or fail prematurely during the stamping process, failing to meet the requirements of mold life and mass production. In addition, since the die contour needs to be fitted tightly to the conical surface, the processing and manufacturing are difficult, and the control of the fitting clearance is more difficult, which further exacerbates the problem of the die insert being easily damaged. Utility Model Content

[0004] To address the problem in existing downward stamping progressive dies that have a conical surface below the punching position, resulting in excessively thin sidewalls and insufficient structural strength of the die inserts, thus affecting the die's service life and continuous, stable stamping, this invention provides an upward stamping progressive die structure.

[0005] This utility model is implemented as follows: a progressive die structure for upward punching includes a lower die, an upper die, an upper die base, a stripper plate, and a punch assembly. The punch assembly is mounted on the lower die and has a punch that moves upward to punch a tapered groove in the workpiece. The stripper plate has a vertical discharge hole corresponding to the punch and a horizontal discharge hole communicating with the vertical discharge hole. The horizontal discharge hole passes through the stripper plate and one end is connected to a blower.

[0006] In the above technical solution, preferably, the lower die and the upper die form a progressive die assembly, the progressive die assembly has a stamping station and a punching station located behind the stamping station, the upper die stamps the workpiece at the stamping station by moving from top to bottom, and the lower die of the stamping station is provided with a lower forming part that forms the conical groove on the bottom of the workpiece.

[0007] In the above technical solution, preferably, the side of the unloading plate is equipped with a pipe joint seat in a detachable manner, the pipe joint seat is provided with an air inlet pipe, the inner side of the air inlet pipe is connected to the discharge horizontal hole, and the outer side of the air inlet pipe is provided with a pipe interface for connecting a blower.

[0008] In the above technical solution, preferably, the diameter of the unloading vertical hole is larger than the diameter of the punch, and in the state of mold closing and punch ejection, the upper end of the punch extends into the hole to a greater height than the upper end of the unloading vertical hole.

[0009] This design employs a bottom-up punching method in a progressive die, meaning the punching direction is opposite to the stamping direction. By placing the punch in the lower die and completing the punching operation from bottom to top, the die component corresponding to the punching position can adopt a planar structure or a locally thickened structure. This avoids the problems of die fitting and thin-walled weakness caused by complex product structures or locally conical surfaces, significantly improving the overall strength and durability of the die insert and effectively extending the die life. In this structure, there is no longer a fitting requirement between the punch and the conical surface of the product, simplifying die design and processing, and improving die manufacturing precision and consistency.

[0010] Furthermore, because the punch moves from bottom to top, the discharge direction of the punching waste no longer relies on the traditional downward discharge method. Instead, it is directly pushed into the stripper plate of the upper die. With the help of the designed discharge channel and blower, the waste can be quickly discharged laterally from the stripper plate, thus solving the problem of waste retention that may be caused by reverse punching. This ensures that the die still has good waste discharge capability under high-speed continuous stamping conditions, improving stamping stability. This design also has advantages such as compact structure, strong adaptability, and easy integration with standard stamping processes. It is particularly suitable for progressive die stamping scenarios where the product has a complex local structure and traditional top-down punching is difficult to implement, and has significant practical value and promotional significance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the workpiece's structure;

[0012] Figure 2 This is a schematic diagram of the stamping direction in the prior art;

[0013] Figure 3 This is a schematic diagram of the structure of a concave die insert in the prior art;

[0014] Figure 4 This is a top view of the structure of this utility model application;

[0015] Figure 5 This is a side view of the punching station in this utility model application;

[0016] Figure 6 This is a top view of the punching station in this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0018] To address the problem in existing downward-punching progressive dies where the area below the punching point is conical, resulting in excessively thin sidewalls and insufficient structural strength of the die insert, thus affecting die life and continuous, stable punching, this invention provides an upward-punching progressive die structure. To further illustrate the structure of this invention, a detailed description is provided below in conjunction with the accompanying drawings:

[0019] Please see Figures 4-6 A progressive die structure for upward punching includes a lower die, an upper die 3, an upper die base 4, a stripper plate 5, and a punch assembly. The stripper plate is mounted on the upper die base, the upper die is mounted on the stripper plate, and the upper die base drives the stripper plate and the upper die to move up and down.

[0020] The lower and upper dies form a progressive die assembly. As is known technology, a progressive die consists of multiple stations, each sequentially linked to complete different processes, performing a series of different stamping processes in one stroke of the press. In this embodiment, the progressive die assembly has a stamping station and a punching station located behind the stamping station.

[0021] The upper die moves from top to bottom to stamp the workpiece at the stamping station, and the lower die at the stamping station is provided with a lower forming part that forms a conical groove on the bottom of the workpiece.

[0022] The punch assembly is mounted on the lower die 10. The punch assembly includes a punch 6 that moves upwards to punch a tapered groove in the workpiece. The structure and working principle of the punch assembly are conventional techniques in the machining field. Specifically, the punch assembly includes a punch, a punch holder, and a guide structure for supporting and guiding the punch. The punch holder is fixedly mounted on the lower die 11. One end of the punch body is embedded in the punch holder, and the other end extends upwards for punching. The guide structure is located on the outer periphery of the punch body and cooperates with the guide hole of the lower die to restrict the movement direction of the punch during the stamping process, ensuring that it punches the tapered groove in the workpiece in an upward direction. The punch assembly can reciprocate relative to the lower die under the action of a hydraulic cylinder drive mechanism to complete the punching process on the workpiece.

[0023] The stripper plate is provided with stripping vertical holes corresponding to the punches and discharge horizontal holes 8 communicating with the stripping vertical holes 7. The discharge horizontal holes penetrate the stripper plate and one end is connected to a blower. The blower blows high-pressure gas into the discharge horizontal holes, causing a high-pressure airflow to be discharged to the side inside the discharge horizontal holes. In this embodiment, the number of stripping vertical holes corresponds to the number of punches, and multiple discharge horizontal holes are set on the stripper plate according to the specific position of the stripping vertical holes. All discharge horizontal holes are set horizontally and parallel. The diameter of the stripping vertical holes is larger than the diameter of the punches to avoid the scrap from getting stuck. When the mold is closed and the punches are ejected, the upper end of the punch extends into the vertical holes to a height greater than the upper end of the stripping vertical holes, thereby completely pushing the scrap into the discharge horizontal holes. When the mold is closed and the punches are ejected, after the punches complete the punching, the punched scrap is pushed into the discharge horizontal holes after being ejected to the limit position. Under the action of the airflow, the scrap is quickly carried away from the stripping hole area and discharged through the side of the stripper plate.

[0024] To enhance the modularity and ease of maintenance of the structure, a pipe connector seat 9 is detachably installed on the side of the unloading plate. The pipe connector seat is equipped with an air inlet pipe, the inner side of which is connected to the discharge transverse hole, and the outer side of which is equipped with a pipe interface for connecting a blower. The blower can be set to start in conjunction with the ejection action of the punch, or can be programmed to achieve synchronous air blowing, ensuring timely and reliable discharge and preventing waste material residue from clogging the mold cavity.

[0025] 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 progressive die structure for upward punching, comprising a lower die, an upper die, an upper die base, a stripper plate, and a punch assembly, characterized in that: The punch assembly is installed on the lower mold. The punch assembly has a punch that moves from bottom to top to punch a conical groove in the workpiece. The unloading plate is provided with an unloading vertical hole corresponding to the punch and a discharge horizontal hole communicating with the unloading vertical hole. The discharge horizontal hole passes through the unloading plate and one end is connected to a blower.

2. The progressive die structure for upward punching according to claim 1, characterized in that: The lower die and the upper die form a progressive die assembly. The progressive die assembly has a stamping station and a punching station located behind the stamping station. The upper die stamps the workpiece at the stamping station by moving from top to bottom. The lower die at the stamping station is provided with a lower forming part that forms the conical groove on the bottom of the workpiece.

3. The progressive die structure for upward punching according to claim 2, characterized in that: The side of the unloading plate is detachably equipped with a pipe connector seat. The pipe connector seat is provided with an air inlet pipe. The inner side of the air inlet pipe is connected to the discharge horizontal hole, and the outer side of the air inlet pipe is provided with a pipe interface for connecting a blower.

4. The progressive die structure for upward punching according to claim 3, characterized in that: The diameter of the unloading vertical hole is larger than the diameter of the punch. When the mold is closed and the punch is ejected, the upper end of the punch extends into the vertical hole to a height greater than the upper end of the unloading vertical hole.

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