A lead sleeve steel core assembling device

Abstract

The application discloses a lead sleeve steel core assembling device and relates to the technical field of bullet head assembling. The device is assembled by using a pure mechanical mechanism. Artificial adjustment of rubber mold pressing force can be avoided, and adjustment is not needed after the mold is replaced. The original structural defects can be completely avoided, and problems such as equipment opening adjustment, mold replacement adjustment and the like can be avoided. Production personnel can effectively reduce equipment adjustment time in the production process by using the device, no longer rely on the experience of equipment adjustment personnel, and the lubricating liquid concentration, temperature and the like in the production process no longer affect the product size. Meanwhile, when the state of incoming parts changes, normal production can be adapted, and secondary adjustment of the tooling is not needed. Since a steel mold is used for limiting, the consistency and stability of the product size are well controlled.

Description

Technical Field

[0001] This invention relates to the field of bullet assembly technology, and in particular to a lead-sleeve steel core assembly device with a one-way valve limiting function that can be used in conjunction with a punch press. Background Technology

[0002] In the production of large-caliber machine gun ammunition, components such as lead sleeves and steel cores are used for bullet heads. The assembly of lead sleeves and steel cores is a crucial step in the bullet head assembly process. In the traditional lead sleeve and steel core assembly process, most manufacturers use a single-machine production mode. After producing the lead sleeves and steel cores separately, the lead sleeves are dried and sorted. Finally, the lead sleeves are manually placed and the steel cores are attached, and the assembly is completed by machine pressing.

[0003] Patent application number 202211199524.9 discloses a lead-sleeve and steel-core assembly device that uses a double rubber mold method to achieve the assembly of the lead-sleeve and steel-core. During production, a punch feeds the pre-prepared lead sleeve and the ordered steel core into the rubber molds. Rubber mold a achieves pre-assembly of the lead sleeve and steel core (the dimensions of the lead sleeve and steel core do not need to be precisely aligned); rubber mold b achieves final assembly of the lead sleeve and steel core (the assembly dimensions of the lead sleeve and steel core are precisely aligned), thus completing the assembly and forming of the lead sleeve and steel core. The rubber molds a and b are elastic and have adjustable inner holes. This method uses friction to achieve the assembly of the lead sleeve and steel core. Its principle is that by adjusting the size of the inner hole of the rubber mold, the friction force is adjustable, achieving the purpose of assembling the steel core and lead sleeve.

[0004] This method has the following drawbacks:

[0005] ① The shrinkage of the rubber molding is adjusted by the nut, which cannot be quantitatively determined. The adjustment relies heavily on the operator's feel and experience, making it difficult to adjust.

[0006] ②The friction of the rubber mold is uncontrollable, and the clamping amount needs to be readjusted when the mold is replaced, resulting in a long adjustment time.

[0007] ③ High requirements for the surface consistency of the steel core; changing batches of steel cores may require readjusting the rubber mold.

[0008] ④ The consistency of the assembled parts is affected by the lubrication effect of soap solution, and the concentration and temperature of soap solution both affect the dimensional consistency of the assembled parts.

[0009] ⑤ Before the start of the shift, the components need to be run-in multiple times to achieve the required lubrication conditions in order to meet the requirements.

[0010] Due to the above-mentioned drawbacks, the equipment setup and commissioning time is long under this method. Commissioning relies on employee experience and soap concentration. It also requires high consistency of parts and is prone to problems such as unstable product dimensions or even non-compliance due to changes in materials (large variation in assembly dimensions and unstable dimensions). Summary of the Invention

[0011] In view of the above problems, the present invention provides a lead-sleeve steel core assembly device to overcome or at least partially solve the above problems. The use of a unidirectional mold enables both dimensional stability control during the steel core assembly process and ensures the structural suitability of the lead-sleeve steel core on the punch press, while also providing flexible compensation for the punch press stroke.

[0012] This invention provides the following solution:

[0013] A lead-sheathed steel core assembly device, comprising:

[0014] The assembly execution unit includes a main slide block assembly and a return slide block assembly. The main slide block assembly includes a main slide block and a punch rod connected to the main slide block. The return slide block assembly includes a return slide block and a return die. The main slide block and the return slide block move synchronously under the action of an external power component. The punch rod and the return die are arranged coaxially.

[0015] A combined one-way mold unit is located between the punch and the return die. The combined one-way mold unit includes a mold sleeve, an adjusting nut, a rubber mold, a one-way valve, and a combined die. The mold sleeve is hollow and divided by a partition to form a first cavity and a second cavity. The inner walls of the distal ends of both the first and second cavities are provided with internal threads. The rubber mold is disposed in the first cavity and is confined between the adjusting nut and the partition by the adjusting nut. The combined die is connected to the second cavity by a threaded connection, and the one-way valve is disposed in a free state between the combined die and the partition.

[0016] The adjusting nut includes a first inner hole, the rubber diaphragm includes a second inner hole, the partition includes a third inner hole, the one-way valve includes a fourth inner hole, and the assembled steel mold includes a fifth inner hole; the axes of the first inner hole, the second inner hole, the third inner hole, and the fifth inner hole are arranged coaxially with the punch rod.

[0017] The one-way valve can slide freely up and down between the partition and the assembly steel mold. After the lead sleeve and steel core assembly to be assembled is pre-installed through the rubber membrane, the lead sleeve and steel core assembly to be assembled is pushed by the punch rod to lift the one-way valve, so that the lead sleeve and steel core assembly to be assembled passes through the fourth inner hole and enters the fifth inner hole. After the punch rod retracts and the lead sleeve and steel core assembly to be assembled is fully entered into the fifth inner hole, it falls back to form a block at the rear end of the lead sleeve and steel core assembly to be assembled, so that the lead sleeve and steel core assembly to be assembled can be press-fitted by the back punching force of the back punching steel mold.

[0018] Preferably, the external power assembly includes a punch press, and the main slide block and the return slide block are connected to the punch press through a connecting mechanism so that the main slide block and the return slide block move synchronously under the action of the punch press.

[0019] Preferably, the first inner hole, the second inner hole, the fourth inner hole, and the fifth inner hole each have a guide port structure facing one end of the punch rod.

[0020] Preferably, the pressure of the adjusting nut on the rubber diaphragm is changed to adjust the diameter of the second inner hole, so as to realize the pre-assembly of the lead sleeve steel core assembly to be assembled to accommodate different sizes.

[0021] Preferably, a limiting step is provided at the connection between the inner wall of the second cavity and the internal thread. The limiting step is used to limit the length of the assembled steel mold entering the second cavity, so that the one-way valve can move freely between the assembled steel mold and the partition.

[0022] Preferably, the return punch die is connected to the return punch slider through a flexible return punch stroke supplement mechanism. The flexible return punch stroke supplement mechanism is used to compensate for insufficient return punch stroke after the return punch slider has completed its full stroke.

[0023] Preferably, the flexible supplementary mechanism for the return stroke includes a return mounting plate, a return adjusting plate, a guide assembly, a mounting base, and a cylinder; the return steel mold and the return adjusting plate are both connected to the return mounting plate, the guide assembly is connected to the return adjusting plate and the cylinder respectively, the guide assembly and the cylinder are both connected to the mounting base, and the mounting base is connected to the return slider.

[0024] Preferably, the guide assembly includes at least two sets of guide sleeves and a guide shaft.

[0025] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0026] This application provides a lead-sleeve steel core assembly device that uses a purely mechanical mechanism for assembly. It eliminates the need for manual adjustment of the rubber mold clamping force, and no adjustment is required after mold replacement. It completely avoids the shortcomings of the original structure, avoiding problems such as equipment start-up debugging and mold replacement debugging. Production personnel using this device can effectively reduce equipment debugging time during production, no longer relying on the experience of equipment debugging personnel, and the concentration and temperature of lubricating fluid during production no longer affect product dimensions. Simultaneously, it can adapt normally to production when the condition of incoming parts changes, without the need for secondary tooling adjustments. Due to the use of steel mold limiting, the consistency and stability of product dimensions are well controlled.

[0027] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a lead-sheathed steel core assembly device provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the assembly unidirectional mold unit provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the backflush slider assembly provided in an embodiment of the present invention.

[0032] In the diagram: 1. Assembly of one-way mold unit, 101. Mold steel sleeve, 102. Adjusting nut, 103. Rubber mold, 104. One-way valve, 105. Assembly of steel mold, 106. Backflush steel mold, 107. Lead sleeve steel core assembly to be assembled, 2. Backflush slider assembly, 201. Backflush mounting plate, 202. Backflush adjusting plate, 203. Guide sleeve, 204. Guide shaft, 205. Mounting seat, 206. Cylinder, 207. Main slider assembly, 3. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0034] See Figure 1 , Figure 2 , Figure 3 This invention provides a lead-sheathed steel core assembly device, such as... Figure 1 , Figure 2 , Figure 3 As shown, the device may include:

[0035] The assembly execution unit includes a main slider assembly 3 and a return slider assembly 2. The main slider assembly 3 includes a main slider and a punch connected to the main slider. The return slider assembly 2 includes a return slider 201 and a return die 106. The main slider and the return slider 201 move synchronously under the action of an external power component. The punch and the return die 106 are arranged coaxially.

[0036] A combined one-way mold unit 1 is located between the punch and the return punch 106. The combined one-way mold unit 1 includes a mold sleeve 101, an adjusting nut 102, a rubber mold 103, a one-way valve 104, and a combined steel mold 105. The mold sleeve 101 is hollow and divided by a partition to form a first cavity and a second cavity. The inner walls at the distal ends of the first cavity and the second cavity are provided with internal threads. The rubber mold 103 is disposed in the first cavity and is limited by the adjusting nut 102 between the adjusting nut 102 and the partition. The combined steel mold 105 is connected to the second cavity by a threaded connection. The one-way valve 104 is disposed in a free state between the combined steel mold 105 and the partition.

[0037] The adjusting nut 102 includes a first inner hole, the rubber diaphragm 103 includes a second inner hole, the partition includes a third inner hole, the one-way valve 104 includes a fourth inner hole, and the assembled steel mold 105 includes a fifth inner hole; the axes of the first inner hole, the second inner hole, the third inner hole, and the fifth inner hole are arranged coaxially with the punch rod.

[0038] The one-way valve 104 can slide freely up and down between the partition and the assembly steel mold 105. After the lead sleeve and steel core assembly 107 to be assembled passes through the rubber membrane 103 for pre-assembly, the lead sleeve and steel core assembly 107 to be assembled is pushed by the punch rod to lift the one-way valve 104, so that the lead sleeve and steel core assembly 107 to be assembled passes through the fourth inner hole and enters the fifth inner hole. After the punch rod retracts and the lead sleeve and steel core assembly 107 to be assembled is fully entered into the fifth inner hole, it falls back to form a block at the rear end of the lead sleeve and steel core assembly 107 to be assembled, so that the lead sleeve and steel core assembly 107 to be assembled can be press-fitted by the back punching force of the back punching steel mold 106.

[0039] The lead-sleeve steel core assembly device provided in this application uses a combination of a rubber mold and a steel mold to achieve the assembly of the lead-sleeve steel core. Tightening the front adjusting nut enables adjustment using the rubber mold, while the rear uses a steel mold and a one-way valve mechanism to control the rigidity of the steel core assembly dimensions. The one-way valve structure ensures the steel core's anti-reverse movement and limiting position during the assembly process. The sliding one-way valve structure automatically closes under gravity, and a guide port at the front end of the one-way valve ensures smooth opening.

[0040] This device can be used for the assembly of lead sleeve and steel core. It uses a one-way valve to prevent the steel core and lead sleeve from retracting and to position them during the press-fitting process. It then uses a punch press to assemble the lead sleeve and steel core together. The rigid mold restricts the consistency of the dimensions of the assembled lead sleeve and steel core, ensuring that the dimensions of the assembled lead sleeve and steel core are stable and reliable.

[0041] The punch and return die 106 provided in this application embodiment can move synchronously back and forth in a linear reciprocating motion under the drive of an external power component. The external power component can be of various types. For example, in one implementation, this application embodiment can provide that the external power component includes a punch press, and the main slide block and the return slide block 201 are connected to the punch press through a connecting mechanism so that the main slide block and the return slide block 201 move synchronously under the action of the punch press.

[0042] To ensure that the lead sleeve steel core assembly 107 to be assembled can smoothly enter each inner hole, this embodiment of the application may also provide that the first inner hole, the second inner hole, the fourth inner hole and the fifth inner hole of the lead sleeve steel core assembly 107 to be assembled each have a guide port structure facing the end of the punch rod.

[0043] The rubber diaphragm 103 provided in this embodiment can be used for pre-assembly of the lead sleeve steel core assembly 107 to be assembled. To accommodate lead sleeve steel core assemblies 107 of different sizes, this embodiment can also provide a method to change the pressure of the adjusting nut 102 on the rubber diaphragm 103 to adjust the diameter of the second inner hole, thereby accommodating the pre-assembly of lead sleeve steel core assemblies 107 of different sizes. Adjusting the diameter of the second inner hole can also adjust the friction between the lead sleeve steel core assembly 107 and the second inner hole, ensuring adaptability to lead sleeve steel core assemblies 107 of different sizes while also adjusting the pre-assembly force.

[0044] The one-way valve 104 provided in this embodiment uses a lifting-opening and gravity-down closing method to limit the positioning of the lead sleeve steel core assembly 107 to be assembled. Therefore, the one-way valve 104 needs to be able to slide freely between the assembled steel mold 105 and the partition. In order to prevent the assembled steel mold 105 from being installed too tightly and affecting the sliding of the one-way valve 104, this embodiment can also provide a limiting step at the connection between the inner wall of the second cavity and the internal thread. The limiting step is used to limit the length of the assembled steel mold 105 entering the second cavity, so that the one-way valve 104 can move freely between the assembled steel mold 105 and the partition.

[0045] In order to compensate for insufficient return stroke of the return slider 201, this application embodiment can also provide that the return die 106 is connected to the return slider 201 through a flexible return stroke supplement mechanism. The flexible return stroke supplement mechanism is used to compensate for insufficient return stroke after the return slider 201 has completed its full stroke.

[0046] Furthermore, the flexible supplementary mechanism for the return stroke includes a return mounting plate 202, a return adjusting plate 203, a guide assembly, a mounting base 206, and a cylinder 207; the return steel mold 106 and the return adjusting plate 203 are both connected to the return mounting plate 202, the guide assembly is connected to the return adjusting plate 203 and the cylinder 207 respectively, the guide assembly and the cylinder 207 are both connected to the mounting base 206, and the mounting base 206 is connected to the return slider 201.

[0047] The guiding assembly includes at least two sets of guide sleeves 204 and a guide shaft 205. The flexible compensation mechanism for the return stroke, using a cylinder 207, compensates for the maximum stroke of the return slide 201 of the punch press and provides flexible pressing. The flexible compensation mechanism uses a cylinder as the flexible carrier for stroke compensation; when the return slide reaches its stroke limit, the flexible compensation mechanism achieves secondary stroke compensation.

[0048] The lead-sleeve steel core assembly device provided in this application mainly consists of a lead-sleeve steel core assembly one-way mold unit 1 and a lead-sleeve steel core assembly punch press return stroke flexible supplementary mechanism. The lead-sleeve steel core assembly one-way mold unit 1 mainly comprises a mold steel sleeve 101, an adjusting nut 102, a rubber mold 103, a one-way valve 104, a steel mold, a return punch steel mold 106, and a lead-sleeve steel core assembly 107.

[0049] Specifically, the mold sleeve 101 serves as the mounting base for the entire mold. The interior of the mold sleeve 101 is divided into a first cavity and a second cavity by a partition. Threaded holes are designed at the front ends of both the first and second cavities. The rubber mold 103 is inserted into the hole of the first cavity at the front end, and then an adjusting nut 102 is installed. By tightening the adjusting nut 102, the rubber mold 103 is pressed together, and the size of the inner hole of the rubber mold 103 is adjusted, thereby changing the frictional force of the rubber mold 103 on the lead sleeve. The front-end rubber mold 103 serves as a pre-assembly mechanism for the lead sleeve and steel core. When the main slide assembly 3 of the punch press pushes the lead sleeve and steel core into the front end of the mold, the lead sleeve and steel core assembly can be pre-assembled (the dimensions of the lead sleeve and steel core do not need to be precisely aligned).

[0050] The second cavity at the rear end of the mold sleeve 101 is also designed with a threaded hole. The one-way valve 104 is installed in the one-way valve 104 cavity formed between the mold sleeve 101 and the assembled mold 105. The threaded hole is designed with a limit step to prevent the flexibility of the one-way valve 104 from being affected after the assembled mold 105 is tightened. The one-way valve 104 is designed with an arc-shaped guide port at the front end. When the main slide block assembly 3 of the punch press pushes the lead sleeve steel core assembly into the one-way valve 104, the one-way valve 104 is lifted by the lead sleeve steel core assembly 107, the one-way valve 104 opens, and the lead sleeve steel core assembly 107 enters the assembled mold 105.

[0051] When the main slide of the punch press retracts, the one-way valve 104 falls back, at which point the one-way valve 104 closes. At the same time as the main slide retracts, the return slide 201 drives the return die 106, and then the lead sleeve steel core assembly 107 is press-fitted through the flexible supplementary mechanism of the return stroke of the lead sleeve steel core assembly punch press.

[0052] During press fitting, the one-way valve 104 is closed, and the steel core is limited by the one-way valve 104. Under the force of the cylinder 207, the return punch 106 presses the lead sleeve and the steel core together. By designing the return punch 106 to cooperate with the steel mold, the press fitting dimensions are stable and consistent.

[0053] The flexible supplementary mechanism for the return stroke of the lead-sleeved steel core combined punch press mainly consists of a return slide block 201, a return mounting plate 202, a return adjustment plate 203, a guide sleeve 204, a guide shaft 205, a mounting base 206, a cylinder 207, and a return die 106. The return slide block 201 and the main slide block assembly can be connected to the punch press to achieve synchronous operation.

[0054] Specifically, the flexible supplementary mechanism for the return stroke of the lead-sleeved steel core assembly punch press mainly serves to compensate for insufficient return stroke after the return stroke slider 201 has completed its full stroke. The return stroke die 106 is mounted on the return stroke mounting plate 202, which is connected to the return stroke adjustment plate 203 to achieve return stroke position adjustment. Stroke compensation is achieved by mounting a guide shaft 205, a guide sleeve 204, and a cylinder 207 on the mounting base 206. The guide shaft 205 and guide sleeve 204 ensure straight-line movement within the return stroke, thus guaranteeing return stroke accuracy. The cylinder 207 can stop at any position; when the return stroke is restricted by the lead-sleeved steel core, the cylinder 207 stops. When the length of the lead-sleeved steel core assembly 107 varies within the allowable range, the stroke compensation mechanism can flexibly supplement the return stroke of the lead-sleeved steel core assembly punch press under the action of the cylinder 207.

[0055] In use, the device provides the lead sleeve and steel core to the assembly unidirectional mold unit 1. The punch press starts, driving the punch rod to move towards the assembly unidirectional mold unit 1. The punch rod pushes the lead sleeve and steel core through the first inner hole of the adjusting nut 102 into the second inner hole of the rubber diaphragm. After passing through the second inner hole, the lead sleeve and steel core are pre-assembled. Then, they pass through the third inner hole of the partition and enter the fourth inner hole of the one-way valve 104. During the movement, the one-way valve 104 is lifted and opened. The punch rod continues to move forward, pushing the lead sleeve and steel core into the fifth inner hole of the assembly steel mold 105. During the movement of the punch rod towards the assembly unidirectional mold unit 1, the return punch slider assembly 2 moves in the same direction.

[0056] After the lead sleeve and steel core are fully inserted into the fifth inner hole, the punch press drives the main slide block assembly 3 and the return slide block assembly 2 to return. After the punch rod exits the fourth through hole, the one-way valve 104 loses its supporting force and slides down under the action of gravity, closing the one-way valve 104. The lead sleeve and steel core are then confined within the fifth inner hole. As the return stroke continues, the return punch die 106 contacts the front end of the steel core, achieving the pressing of the lead sleeve and steel core. If the return stroke of the return slide block 201 is insufficient, the return stroke is compensated by a flexible supplementary mechanism. Specifically, after the return slide block 201 stops moving, the cylinder 207 actuates to push the return punch die 106 to continue moving towards the steel core until it is confined by the lead sleeve and steel core, at which point the cylinder 207 stops. This completes one assembly of the lead sleeve and steel core. During the next assembly, the lead sleeve and steel core assembled in the fifth inner hole can be pushed out by the next set of lead sleeve and steel cores, and this assembly operation can be repeated.

[0057] In summary, the lead sleeve and steel core assembly device provided in this application employs a purely mechanical mechanism for assembly. This eliminates the need for manual adjustment of the rubber mold clamping force, and no adjustment is required after mold replacement. It completely avoids the shortcomings of the original structure, avoiding problems such as equipment start-up debugging and mold replacement debugging. Production personnel using this device can effectively reduce equipment debugging time during production, no longer relying on the experience of equipment debugging personnel, and the concentration and temperature of lubricating fluid during production no longer affect product dimensions. Furthermore, it can adapt normally to production when the condition of incoming parts changes, without the need for secondary tooling adjustments. Due to the use of steel mold limiting, the consistency and stability of product dimensions are well controlled.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0060] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A lead-sheathed steel core assembly device, characterized in that, include: The assembly execution unit includes a main slide block assembly and a return slide block assembly. The main slide block assembly includes a main slide block and a punch rod connected to the main slide block. The return slide block assembly includes a return slide block and a return die. The main slide block and the return slide block move synchronously under the action of an external power component. The punch rod and the return die are arranged coaxially. A combined one-way mold unit is located between the punch and the return die. The combined one-way mold unit includes a mold sleeve, an adjusting nut, a rubber diaphragm, a one-way valve, and a combined die. The mold sleeve is hollow and divided by a partition to form a first cavity and a second cavity. The inner walls of the distal ends of both the first and second cavities are provided with internal threads. The rubber diaphragm is disposed in the first cavity and is confined between the adjusting nut and the partition by the adjusting nut. The combined die is connected to the second cavity by a threaded connection, and the one-way valve is disposed in a free state between the combined die and the partition. The adjusting nut includes a first inner hole, the rubber diaphragm includes a second inner hole, the partition includes a third inner hole, the one-way valve includes a fourth inner hole, and the assembled steel mold includes a fifth inner hole; the axes of the first inner hole, the second inner hole, the third inner hole, and the fifth inner hole are arranged coaxially with the punch rod. The one-way valve can slide freely up and down between the partition and the assembly steel mold. After the lead sleeve and steel core assembly to be assembled is pre-installed through the rubber membrane, the lead sleeve and steel core assembly to be assembled is pushed by the punch rod to lift the one-way valve, so that the lead sleeve and steel core assembly to be assembled passes through the fourth inner hole and enters the fifth inner hole. After the punch rod retracts and the lead sleeve and steel core assembly to be assembled is fully entered into the fifth inner hole, it falls back to form a block at the rear end of the lead sleeve and steel core assembly to be assembled, so that the lead sleeve and steel core assembly to be assembled can be press-fitted by the back punching force of the back punching steel mold.

2. The lead-sleeve steel core assembly device according to claim 1, characterized in that, The external power assembly includes a punch press, and the main slide block and the return slide block are connected to the punch press through a connecting mechanism so that the main slide block and the return slide block move synchronously under the action of the punch press.

3. The lead-sleeve steel core assembly device according to claim 1, characterized in that, Each of the first inner hole, the second inner hole, the fourth inner hole, and the fifth inner hole has a guide port structure facing one end of the punch rod.

4. The lead-sleeve steel core assembly device according to claim 1, characterized in that, The pressure of the adjusting nut on the rubber diaphragm is changed to adjust the diameter of the second inner hole, thereby enabling the pre-assembly of the lead sleeve steel core assembly to be assembled to accommodate different sizes.

5. The lead-sleeve steel core assembly device according to claim 1, characterized in that, A limiting step is provided at the connection between the inner wall of the second cavity and the internal thread. The limiting step is used to limit the length of the assembled steel mold entering the second cavity, so that the one-way valve can move freely between the assembled steel mold and the partition.

6. The lead-sheathed steel core assembly device according to claim 1, characterized in that, The return stroke die is connected to the return stroke slider through a flexible return stroke supplement mechanism. The flexible return stroke supplement mechanism is used to compensate for insufficient return stroke after the return stroke slider has completed its full stroke.

7. The lead-sleeve steel core assembly device according to claim 6, characterized in that, The flexible supplementary mechanism for the return stroke includes a return mounting plate, a return adjustment plate, a guide assembly, a mounting base, and a cylinder; the return steel mold and the return adjustment plate are both connected to the return mounting plate, the guide assembly is connected to the return adjustment plate and the cylinder respectively, the guide assembly and the cylinder are both connected to the mounting base, and the mounting base is connected to the return slider.

8. The lead-sleeve steel core assembly device according to claim 7, characterized in that, The guide assembly includes at least two sets of guide sleeves and a guide shaft.

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