Injection molding mold and process for bullet and cannonball support structure

Abstract

The invention discloses an injection molding mold and process for bullets and shell support structures, and relates to the technical field of bullet injection molding, the injection molding mold comprises a front mold and a rear mold, the front mold is arranged at one end of the rear mold and is in sealing fit with the rear mold, a bottom support positioning hole is formed in one end of the rear mold, and the front mold comprises an upper mold and a lower mold arranged at the lower end of the upper mold; a bullet core positioning hole and a glue inlet are formed between the upper die and the lower die, the glue inlet is communicated with the bullet core positioning hole, and the bullet core positioning hole is communicated with the bottom support positioning hole. The bullet core and the bottom support are formed into a whole through injection molding in advance, the combination strength of the bullet core and the bottom support can be guaranteed, then the bullet core and the bottom support which are integrated are put into a mold to be subjected to bullet support injection molding, a complete product (bullet) is formed, follow-up machining of the product is avoided, the working procedure is simple, the speed is high, and the production efficiency is greatly improved; and the product manufactured through the process is high in strength, damage to the shot in the service process is greatly avoided, and the consistency of the product can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of bullet injection molding, and in particular to an injection molding mold and process for a bullet and shell support structure. Background Art

[0002] In the current projectile forming process, projectiles are generally produced by semi-package injection molding (see Figure 1 ), during the injection molding process, the front end of the core is positioned for injection molding, and the excess material is removed by machining after injection molding. This has low efficiency, high molding cost, and it is difficult to control product consistency. In addition, there is a problem of shooting jamming during subsequent shooting. The current all-inclusive structure projectile is basically assembled (see Figure 2 ), the disadvantage of this method is that the strength of the combination of the cartridge case, the core and the base is insufficient, and the coaxiality between them is large. During the shooting process, the core and the cartridge case are not guided synchronously in the barrel, and the consistency of the cartridge case unpacking after leaving the barrel is poor, which affects the shooting accuracy of the core. Summary of the invention

[0003] The object of the present invention is to provide an injection molding mold and process for a bullet and shell support structure to solve the above-mentioned technical problems.

[0004] The technical solution adopted by the present invention is as follows:

[0005] An injection molding mold for a bullet and shell support structure, comprising a front mold and a rear mold, wherein the front mold is arranged at one end of the rear mold and is sealed with the rear mold, a base positioning hole is provided at one end of the rear mold, the front mold comprises an upper mold and a lower mold arranged at the lower end of the upper mold, a core positioning hole and a glue inlet are formed between the upper mold and the lower mold, the glue inlet is communicated with the core positioning hole, and the core positioning hole is communicated with the base positioning hole.

[0006] Preferably, the glue inlet is located at an end of the core positioning hole away from the base positioning hole.

[0007] Preferably, there is a gap between the inner wall of the core positioning hole and the outer wall of the core.

[0008] As a further preference, there is a gap between one end of the glue inlet and the end of the elastic core.

[0009] An injection molding process for a bullet and shell sabot structure, comprising an injection molding mold for the bullet and shell sabot structure, the molding process comprising:

[0010] S1. Set injection molding parameters according to the material characteristics of the support;

[0011] S2, pouring the injection molding nylon particles for injection molding elastic support into the hopper of the injection molding machine for processing to form a sol;

[0012] S3, then open the upper mold, place the integrated base and the elastic core in the base positioning hole and the elastic core positioning hole, and then close the mold;

[0013] S4, injecting sol into the positioning hole of the core through the glue inlet;

[0014] S5. Injection mold the base and the elastic core into one piece, and take them out after cooling.

[0015] As a further preference, the injection molding parameters include injection molding temperature, pressure and speed, wherein the injection molding temperature is divided into four stages, including the first stage, the second stage, the third stage and the fourth stage, the heating temperature of the first stage is 230±5°C, the heating temperature of the second stage is 240±5°C, the heating temperature of the third stage is 245±5°C, and the heating temperature of the fourth stage is 245±5°C.

[0016] As a further preference, the pressure including injection pressure, holding pressure and sol pressure is 1900-2000 bar, the holding pressure is 1900-2000 bar, and the sol pressure is 50-60 bar.

[0017] As a further preference, the speed includes an injection speed and a holding speed, the injection speed is 35-45 mm / s, and the holding speed is 25 mm / s.

[0018] As a further preference, when injecting the sol, the injection molding mold needs to be always in a heated state.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] In the present invention, the core and the base are connected as one in advance, so that the strength of the combination of the core and the base can be guaranteed, and then the integrated core and the base are placed in a mold for injection molding of the base to form a complete product (projectile), and the product does not require subsequent processing, the process is simple and the speed is fast, which greatly improves the production efficiency; and the product manufactured by this process has high strength, which greatly avoids damage to the projectile during service, can ensure the consistency of the product, and can be extended to the integral injection molding of small-caliber bullets, large-caliber bullets, and small, medium and large-caliber shells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a bullet after half-package injection molding in the prior art;

[0022] Figure 2 It is a schematic diagram of the explosion of a bullet after full-encapsulation injection molding in the prior art;

[0023] Figure 3 It is a structural schematic diagram of the injection molding die of the bullet and shell support structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the bullet after injection molding in the present invention;

[0025] Figure 5 It is a process flow chart of the present invention.

[0026] In the figure: 1. core; 2. base; 3. support; 4. front mold; 5. back mold; 6. base positioning hole; 7. core positioning hole; 8. glue inlet. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Figure 3 It is a structural schematic diagram of the injection molding die of the bullet and shell support structure of the present invention; Figure 4 It is a schematic diagram of the structure of the bullet after injection molding in the present invention; Figure 5 is the process flow chart of the present invention. , please refer to Figures 3 to 5As shown, a preferred embodiment is shown, which shows an injection molding mold of a bullet and shell support structure, including a front mold 4 and a rear mold 5, the front mold 4 is arranged at one end of the rear mold 5 and is sealed with the rear mold 5, and a bottom support positioning hole 6 is arranged at one end of the rear mold 5, and the front mold 4 includes an upper mold and a lower mold arranged at the lower end of the upper mold, and a core positioning hole 7 and a glue inlet 8 are formed between the upper mold and the lower mold, and the glue inlet 8 is connected to the core positioning hole 7, and the core positioning hole 7 is connected to the bottom support positioning hole 6. In this embodiment, see Figure 3 and Figure 4 As shown, a base positioning hole 6 is provided at one end of the rear mold 5 close to the front mold 4 for installing the base 2, and the upper mold and the lower mold in the front mold 4 can move relative to each other, which is convenient for realizing mold opening and closing operations. Among them, the front mold 4 and the rear mold 5 both have a heating function, and heaters can be provided in the front mold 4 and the rear mold 5 for heating, so that a specific temperature is maintained in the core positioning hole 7 and the base positioning hole 6, which is convenient for maintaining the temperature of the sol during injection molding, so that the temperature of all the sols in the core positioning hole 7 is consistent.

[0031] Further, as a preferred embodiment, the glue inlet 8 is located at one end of the core positioning hole 7 away from the bottom bracket positioning hole 6. The glue inlet 8 facilitates the injection of sol into the core positioning hole 7, and the sol is formed by melting the nylon plastic material.

[0032] Furthermore, as a preferred embodiment, there is a gap between the inner wall of the core positioning hole 7 and the outer wall of the core 1 to facilitate the entry of the sol, and the sol forms the support 3 after cooling.

[0033] Furthermore, as a preferred embodiment, there is a gap between one end of the glue inlet 8 and the end of the core 1 to facilitate the sol to enter the core positioning hole 7.

[0034] The present invention further has the following overlapping processing technology based on the above-mentioned embodiment.

[0035] An injection molding process for a bullet and shell butt structure, including an injection molding mold for a bullet and shell butt structure, the molding process includes:

[0036] S1, setting injection molding parameters according to the material characteristics of the support 3;

[0037] S2, pouring the injection molding nylon particles for the injection molding elastic support 3 into the hopper of the injection molding machine for processing to form a sol;

[0038] S3, then open the upper mold, place the integrated base 2 and the elastic core 1 in the base positioning hole 6 and the elastic core positioning hole 7, and then close the mold;

[0039] S4, injecting sol into the core positioning hole 7 through the glue inlet 8;

[0040] S5, firstly, the base 2 and the core 1 are injection molded into one body, and then taken out after cooling and molding. In this embodiment, the base 2 and the core 1 can be fixed together by mechanical connection, and then the integrated core 1 and the base 2 are placed in the mold and the support 3 is injection molded, so that the strength of the base 2 and the core 1 of the molded product can be ensured, and the coaxiality between the core 1, the base 2 and the support 3 can be ensured, so as to ensure the consistency of the shelling of the support 3 and improve the shooting accuracy.

[0041] In this embodiment, the integrated core 1 and the base are placed in the mold to injection mold the support 3, without removing excess material. It has high efficiency and low molding cost, can ensure product consistency, can quickly realize product production, and can adapt to the application of small-caliber bullets, large-caliber bullets, small, medium and large-caliber artillery shells.

[0042] Further, as a preferred embodiment, the injection molding parameters include injection molding temperature, pressure and speed, wherein the injection molding temperature is divided into four stages, including the first stage, the second stage, the third stage and the fourth stage, the heating temperature of the first stage is 230±5°C, the heating temperature of the second stage is 240±5°C, the heating temperature of the third stage is 245±5°C, and the heating temperature of the fourth stage is 245±5°C. In this embodiment, the injection molding nylon particles can be completely melted into sol by heating in four stages, which can prevent the injection molding nylon particles that are not completely melted from being mixed in the sol and affecting the quality of the product.

[0043] When injecting the sol, the nozzle of the injection molding machine needs to keep the temperature of the nozzle within the range of 243±5° C., which can ensure that the sol maintains a specific temperature and enters the core positioning hole 7 .

[0044] Further, as a preferred embodiment, the pressure including injection pressure, holding pressure and sol pressure is 1900-2000 bar, the holding pressure is 1900-2000 bar, and the sol pressure is 50-60 bar.

[0045] Further, as a preferred embodiment, the speed includes injection speed and holding speed, the injection speed is 35-45 mm / s, and the holding speed is 25 mm / s. The screw speed of the injection molding machine needs to be maintained at 180-200 mm / s, and the rotation pressure position is 21.5-23 mm. The mold holding time is 8-10 seconds.

[0046] Furthermore, as a preferred embodiment, when injecting the sol, the injection molding mold needs to be in a heated state all the time, so that the sol in the core positioning hole 7 can be kept at a specific temperature to avoid the cooling of the sol that first enters the core positioning hole 7 during the injection process. After the injection is completed, the injection molding mold is released from the heating state to allow the sol to cool naturally to form a support 3.

[0047] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection molding mold for a bullet and shell support structure, characterized in that: It includes a front mold and a rear mold, the front mold is arranged at one end of the rear mold and is sealed with the rear mold, one end of the rear mold is provided with a base positioning hole, the front mold includes an upper mold and a lower mold arranged at the lower end of the upper mold, a core positioning hole and a glue inlet are formed between the upper mold and the lower mold, the glue inlet is connected with the core positioning hole, and the core positioning hole is connected with the base positioning hole.

2. The injection molding mold for the bullet and shell support structure according to claim 1, characterized in that: The glue inlet is located at an end of the elastic core positioning hole away from the bottom bracket positioning hole.

3. The injection molding mold for the bullet and shell support structure according to claim 1, characterized in that: There is a gap between the inner wall of the core positioning hole and the outer wall of the core.

4. The injection molding die for the bullet and shell support structure according to claim 3, characterized in that: There is a gap between one end of the glue inlet and the end of the elastic core.

5. An injection molding process for bullet and shell support structure, characterized in that: An injection molding mold comprising the bullet and shell support structure according to any one of claims 1 to 4, wherein the molding process comprises: S1. Set injection molding parameters according to the material characteristics of the support; S2, pouring the injection molding nylon particles for injection molding elastic support into the hopper of the injection molding machine for processing to form a sol; S3, then open the upper mold, place the integrated base and the elastic core in the base positioning hole and the elastic core positioning hole, and then close the mold; S4, injecting sol into the positioning hole of the core through the glue inlet; S5. Injection mold the base and the elastic core into one piece, and take them out after cooling.

6. The injection molding process of the bullet and shell support structure according to claim 5, characterized in that: The injection molding parameters include injection molding temperature, pressure and speed, wherein the injection molding temperature is divided into four stages, including the first stage, the second stage, the third stage and the fourth stage, the heating temperature of the first stage is 230±5°C, the heating temperature of the second stage is 240±5°C, the heating temperature of the third stage is 245±5°C, and the heating temperature of the fourth stage is 245±5°C.

7. The injection molding process of the bullet and shell support structure according to claim 6, characterized in that: The pressure includes injection pressure, holding pressure and sol pressure of 1900-2000 bar, the holding pressure is 1900-2000 bar, and the sol pressure is 50-60 bar.

8. The injection molding process of the bullet and shell support structure according to claim 6, characterized in that: The speed includes an injection speed and a pressure holding speed, the injection speed is 35-45 mm / s, and the pressure holding speed is 25 mm / s.

9. The injection molding process of the bullet and shell support structure according to claim 6, characterized in that: When injecting the sol, the injection molding mold needs to be kept heated.

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