One-time forming device for closing-up of ignition element

Abstract

The invention discloses a one-time forming device for closing of an ignition element, and belongs to the technical field of ammunition blasting. The device mainly comprises a shell, a connecting push rod, a rectangular die spring, a pre-forming punch, a final-forming punch and a closing-in die. The connecting push rod is connected with an external oil press, the final forming punch is fixed to the connecting push rod, and the pre-forming punch is fixed to the shell. And the rectangular mold spring is sleeved on the connecting push rod and is arranged between the connecting push rod and the shell. During working, the oil press drives the connecting push rod to press downwards, and the shell and the pre-forming punch are firstly pushed through spring force to complete pre-forming of the ignition element; when the pressure exceeds the pre-pressure of the spring, the connecting push rod directly drives the final forming punch to perform final forming. The preforming process and the final forming process are integrated in the one-time press-fitting stroke, the automation degree is high, and the production efficiency is greatly improved; and meanwhile, the step-by-step force application mechanism reduces impact on the punch, the service life of the device is prolonged, and the quality consistency of closing-in forming is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ammunition blasting, and particularly relates to a one-time forming device for closing a firing element. BACKGROUND

[0002] The firing element is a core component of ammunition, and its reliability is directly related to the performance of the ammunition. During assembly, the port of the firing element shell needs to be extruded and closed by a precision mold to tightly wrap the internal ignition components such as the ignition powder, so as to form an effective mechanical seal. Such a sealing structure can effectively isolate external moisture and impurities, prevent the firing element from being damped and invalid, and ensure that it can withstand the high pressure impact generated by the powder gas.

[0003] The traditional firing element closing process mostly adopts a two-time or multi-time forming method, that is, the workpiece is first pre-formed by one set of molds, and then transferred to another set of molds for final forming. Such a multi-process technology has problems of low production efficiency, complicated operation, large floor area, and the like, which is not conducive to large-scale and automated production requirements.

[0004] To solve the above problems, devices aiming to realize one-time forming and closing have appeared in the prior art. However, these devices often have obvious defects: the closing punch bears a large impact force during work, which is prone to premature wear or damage, resulting in short service life of the device; at the same time, due to unreasonable structure design, the stability and consistency of the forming process are poor, it is difficult to ensure the uniformity of the closing quality of each firing element, and there are safety hazards.

[0005] Therefore, there is an urgent need in the art for a firing element closing one-time forming device that can greatly improve production efficiency, ensure long service life and high quality consistency. SUMMARY

[0006] The purpose of the present application is to provide a one-time forming device for closing a firing element, which aims to integrate the traditional pre-forming and final-forming two processes into an automatic sequential completion in one pressurization stroke by optimizing the internal structure and transmission logic of the device, so as to solve the problems of low production efficiency, short mold life, poor product quality consistency and the like in the prior art.

[0007] The application is implemented by adopting the following technical scheme: a one-time forming device for closing the mouth of a firing element, comprising a shell, a connecting push rod, a die spring, a pre-forming punch, a final forming punch and a closing die; the connecting push rod is used for connecting with an external pressure mechanism; the die spring is sleeved on the connecting push rod; the pre-forming punch is connected with the shell; the final forming punch is connected with the connecting push rod and is at least partially accommodated in the pre-forming punch; the closing die is used for setting the firing element; the connecting push rod is configured to drive the pre-forming punch and the final forming punch to move towards the closing die in sequence under the action of external pressure, so as to perform closing processing on the firing element arranged in the closing die.

[0008] Further, the die spring is a rectangular die spring.

[0009] Further, the connecting push rod and the final forming punch are connected through threads.

[0010] Further, the shell and the pre-forming punch are connected through threads.

[0011] Further, one end of the die spring is in contact with a shoulder part on the connecting push rod, and the other end is in contact with an inner end face of the shell.

[0012] Further, the closing die is internally provided with a cavity for accommodating and positioning the firing element.

[0013] Further, the external pressure mechanism is an oil press.

[0014] The one-time forming device for closing the mouth of a firing element has the following beneficial effects: The application integrates the traditional separate two-time closing process into a single device and automatically completes the process in one working stroke, thereby eliminating the intermediate transfer and repeated positioning steps, greatly shortening the processing time of a single workpiece, and being particularly suitable for mass continuous production, and improving the production efficiency.

[0015] The device adopts a die spring as a core element for force transmission and conversion, forming a buffer type and staged force application process. The pre-forming punch and the final forming punch do not bear the maximum impact load at the same time, but sequentially and smoothly act on the workpiece, effectively reducing the wear and fatigue of the punch, significantly prolonging the service life of the key vulnerable parts, and reducing the equipment maintenance cost.

[0016] The mechanical structure ensures the action sequence and forming force of the pre-forming and final forming stages. This forced action logic eliminates the uncertainty of manual operation, ensures the stability and repeatability of each firing element closing process parameter, and thus ensures the high consistency of the product closing forming quality, and improves the safety and reliability of the product. BRIEF DESCRIPTION OF DRAWINGS

[0017] The technical solutions in the embodiments of the present application or the prior art will be described below more clearly with the help of the accompanying drawings needed in the description of the embodiments or the prior art. The accompanying drawings in the description below are only some embodiments of the present application, and other accompanying drawings can be obtained from the structures shown in the drawings without any creative effort.

[0018] Figure 1 is a structural schematic diagram of the present application; In the figure, 1 is a shell, 2 is a connecting push rod, 3 is a rectangular die spring, 4 is a pre-forming punch, 5 is a final-forming punch, 6 is a closing die, and 7 is a firing element. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with the help of the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without any creative effort are within the scope of protection of the present application. EMBODIMENTS

[0021] As Figure 1As shown, the embodiment of the present application provides a one-time forming device for the closing of the ignition element, which mainly consists of a shell 1, a connecting push rod 2, a rectangular die spring 3, a pre-forming punch 4, a final forming punch 5, and a closing die 6. The closing die 6 is used for positioning the ignition element 7, which includes a shell port and an internal component. One end of the connecting push rod 2 is provided with external threads for threaded connection with the pressure rod of the oil press; the other end of the connecting push rod 2 is fixedly connected with the final forming punch 5 through threads. The shell 1 is of a hollow structure, one end of the shell 1 is connected with the pre-forming punch 4 through threads, and the other end of the shell 1 is in sliding fit with the connecting push rod 2, allowing the connecting push rod 2 to move axially in the shell 1. The rectangular die spring 3 is sleeved outside the connecting push rod 2, one end of the rectangular die spring 3 is in contact with the shoulder part of the connecting push rod 2, and the other end of the rectangular die spring 3 is in contact with the inner end face of the shell 1, the rectangular die spring 3 has a pre-pressure for buffering and transmitting force. The pre-forming punch 4 is located at the front end of the shell 1, the pre-forming punch 4 is fixedly contacted with the shell 1 after being connected with the shell 1 through threads, and the punch part of the pre-forming punch 4 faces the closing die 6. The final forming punch 5 is located inside the pre-forming punch 4, the final forming punch 5 is connected with the connecting push rod 2 through threads, and the final forming punch 5 can slide axially in the inner cavity of the pre-forming punch 4. The closing die 6 is fixedly installed on an external support structure, the closing die 6 is provided with a cavity inside for accommodating and positioning the ignition element 7, and the closing part of the ignition element 7 faces the pre-forming punch 4 and the final forming punch 5. The end face of the pre-forming punch 4 is in contact with the closing part of the ignition element 7 during movement, and the end face of the final forming punch 5 is in contact with the closing part of the ignition element 7 during movement.

[0022] The working process of the device is based on the pressure provided by the oil press, which is divided into two stages of pre-forming and final forming. When the oil press is started, the oil press pressure rod moves downward to push the connecting push rod 2 to move downward. The connecting push rod 2 transmits force to the shell 1 through the rectangular die spring 3, and due to the pre-pressure of the rectangular die spring 3, the shell 1 and the pre-forming punch 4 move downward as a whole. In this stage, the pre-forming punch 4 first contacts the closing part of the ignition element 7 and preliminarily extrudes and deforms the shell port, so that the closing part of the ignition element 7 plastically deforms and gradually wraps the internal component. When the pre-forming punch 4 moves to contact the upper end face of the closing die 6, the pre-forming punch 4 stops moving, and the pre-forming process of the ignition element 7 is completed.

[0023] With the continuous increase of the oil pressure machine pressure, when the pressure value exceeds the pre-pressure of the rectangular die spring 3, the connecting push rod 2 overcomes the spring force and continues to move downward, and the rectangular die spring 3 is compressed. The connecting push rod 2 drives the final forming punch 5 to move downward, and the final forming punch 5 extends from the inner cavity of the pre-forming punch 4 and contacts the closing part of the ignition element 7. The final forming punch 5 performs secondary extrusion on the closed part after pre-forming, so that the closed part is further deformed to the final forming state, forming a tight mechanical seal structure. When the final forming punch 5 moves to contact the internal step of the pre-forming punch 4, the final forming punch 5 stops moving, and the final forming process of the ignition element 7 is completed. After that, the oil pressure machine is unloaded, the connecting push rod 2 is reset under the rebound action of the rectangular die spring 3, drives the final forming punch 5 to retract into the pre-forming punch 4, and at the same time, the shell 1 and the pre-forming punch 4 are lifted as a whole, and the device returns to the initial position, and the ignition element 7 can be taken out from the closing die 6.

[0024] Through the above structure design, the one-time forming device exhibits significant technical effects. First, the device integrates the traditional two-time closing process into one-time completion, and the pre-forming and the final forming are realized in continuous action, which greatly improves the production efficiency and is suitable for mass production. Second, the rectangular die spring 3 is used as a force transmission and buffering element, which avoids direct impact, and the contact surfaces of the pre-forming punch 4 and the final forming punch 5 are uniformly stressed during movement, reducing wear and prolonging the service life of the device. At the same time, based on the mature two-time closing principle, the quality consistency of the closing forming is ensured, and the closing part of the ignition element 7 can effectively isolate moisture and impurities and resist the high-pressure impact of the gunpowder gas. In addition, the device has compact structure and reliable connection, and the movement precision and stability are ensured through threaded connection and sliding fit, reducing the maintenance requirement. Therefore, the device is superior to the traditional process in efficiency, service life and reliability, and meets the high requirements of the ammunition blasting field for the manufacture of ignition elements.

[0025] In the above embodiments, the basic principles and main features of the present application and the advantages of the present application are described. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, the modifications and changes made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the protection scope of the claims of the present application.

Claims

1. A one-time forming device for the closing of a firing element, comprising a housing (1), a connecting push rod (2), a die spring (3), a pre-forming punch (4), a final forming punch (5) and a closing die (6); the connecting push rod (2) is used for connecting with an external pressure mechanism; the die spring (3) is sleeved on the connecting push rod (2); the pre-forming punch (4) is connected with the housing (1); the final forming punch (5) is connected with the connecting push rod (2) and is at least partially accommodated in the pre-forming punch (4); the closing die (6) is used for setting a firing element (7); the connecting push rod (2) is configured to be able to drive the pre-forming punch (4) and the final forming punch (5) to move towards the closing die (6) in sequence under the action of an external pressure, so as to perform closing processing on the firing element (7) set in the closing die (6).

2. A one-step device for forming a closure for a firing element according to claim 1, wherein, The die spring (3) is a rectangular die spring.

3. A one-step device for forming a closure for a firing element according to claim 1, wherein, The connecting push rod (2) and the final forming punch (5) are connected through threads.

4. A one-step device for forming a closure for a firing element according to claim 1, wherein, The housing (1) and the pre-forming punch (4) are connected through threads.

5. A one-step device for forming a closure for a firing element according to claim 1, wherein, One end of the die spring (3) is in contact with a shoulder part on the connecting push rod (2), and the other end is in contact with an inner end face of the housing (1).

6. A one-step device for forming a closure for a firing element according to claim 1, wherein, The closing die (6) is internally provided with a cavity for accommodating and positioning the firing element (7).

7. A one-step device for forming a closure for a firing element according to claim 1, wherein, The external pressure mechanism is an oil press.

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