Cartridge case

Abstract

To disclose a cartridge case capable of suppressing the occurrence of a defect where combustion gases within the cartridge case leak backward from a detonator storage portion.SOLUTION: A cartridge case 10A of this embodiment comprises: a cartridge case body 20A having a detonator storage portion 17 at its end for storing a detonator 50; and a ring component 30A fitted outside the detonator storage portion 17 and constituting a head portion 14 of the cartridge case 10A together with the detonator storage portion 17. Members constituting the ring component 30A have higher rigidity than members constituting the cartridge case body 20A.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to cartridge cases. [Background technology]

[0002] It is known that the cartridge case is supported laterally by the inner surface of the gun's chamber, and the amount of deformation caused by the expansion and deformation due to the internal pressure (commonly referred to as "cavity pressure") when the bullet is fired is suppressed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-71179 A (Fig. 1) Summary of the Invention [Problem to be solved by the invention]

[0004] However, the detonator housing at the end of the cartridge is located outside the chamber and is not supported laterally by the inner surface of the chamber, so it can undergo significant radial expansion and deformation. In conventional cartridges, the radial expansion and deformation of the detonator housing can create a gap between the inner surface of the detonator housing and the detonator, causing a problem in which combustion gases inside the cartridge leak behind the detonator housing. This application discloses a cartridge that can prevent such problems from occurring. [Means for solving the problem]

[0005] One aspect of the invention of the present disclosure, made to solve the above-mentioned problems, is a cartridge comprising a cartridge body having a detonator housing portion at its end for housing a detonator, and a ring component that is fitted onto the outside of the detonator housing portion and that, together with the detonator housing portion, forms the head portion of the cartridge, wherein the member that forms the ring component is more rigid than the member that forms the cartridge body. [Effects of the Invention]

[0006] In the cartridge of the present invention, a ring part with higher rigidity than the cartridge body is fitted to the outside of the detonator housing portion, so that the expansion and deformation of the detonator housing portion when the bullet is fired is suppressed more than in the past, and the occurrence of a problem in which combustion gas inside the cartridge leaks rearward from the detonator housing portion can be suppressed. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1A is a side cross-sectional view of a cartridge according to a first embodiment, and FIG. 1B is an enlarged side cross-sectional view of the cartridge. [Figure 2] Figure 2 is an enlarged cross-sectional view of the detonator in the detonator housing hole. [Figure 3] FIG. 3 is an enlarged perspective view of a cartridge body according to a modified example. [Figure 4] 4A and 4B are enlarged cross-sectional side views of a cartridge according to a modified example. [Figure 5] 5A and 5B are enlarged cross-sectional side views of a cartridge according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] [First embodiment] A cartridge 10A of this embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1A, cartridge 10A of this embodiment has the same external shape as a typical cartridge, and includes, in order from the right end to the left in FIG. 1A, neck 11, shoulder 12, body 13, and head portion 14. The body 13 gradually thickens toward the head portion 14, resulting in the inside of the body 13 tapering toward the head portion 14. A detonator fitting hole 15 and a flash hole 16 are formed in the center of head portion 14. Detonator fitting hole 15 is formed from the outer end face 14A of head portion 14 to a position near the inner end face 14B. Flash hole 16 has a smaller diameter than detonator fitting hole 15 and extends from the end of detonator fitting hole 15 to the inner end face 14B. The outer opening edge of detonator fitting hole 15 is rounded. The part of the head portion 14 having the detonator fitting hole 15 in the center thereof serves as a detonator housing portion 17 .

[0009] A rim 18 with approximately the same outer diameter as the left end of the body 13 extends from the end of the outer peripheral surface of the detonator housing 17, and a groove 19 with a smaller outer diameter is formed between the rim 18 and the body 13. The groove 19 has an inner groove side surface 19A, an inner groove side surface 19B, and a groove bottom surface 19C. The inner groove side surface 19A on the body 13 side is tapered, and the corner between the inner groove side surface 19B on the rim 18 side and the groove bottom surface 19C is a pin-angle. The rim 18 also has a tapered surface 18T at the outer edge corner on the side away from the body 13, and the end face of the rim 18 on the side away from the body 13 is flush with the outer end surface 14A of the head portion 14.

[0010] 1A and 1B, the cartridge 10A of this embodiment is formed by fitting a ring component 30A onto one end of the cartridge body 20A. In this embodiment, for example, the entire rim 18 is the ring component 30A, and the entire outer peripheral surface of the detonator housing 17 in the cartridge body 20A is a cylindrical surface with the same diameter as the groove bottom surface 19C of the groove 19. The ring component 30A is fitted onto the outside of the detonator housing 17, and the head portion 14 is formed by the detonator housing 17 and the ring component 30A.

[0011] The ring component 30A is made of a material having higher rigidity than the cartridge body 20A. The cartridge body 20A is made of, for example, brass, an alloy of copper and zinc. The zinc content of the brass is preferably 25 to 40% by weight, and more preferably 28.5 to 31.5% by weight. The rigidity of the brass is preferably, for example, a Young's modulus of 100 to 120 GPa (more preferably 110 GPa), a tensile strength of 290 MPa or more (more preferably 294 MPa or more), and a 0.2% yield strength of 130 to 150 MPa (more preferably 140 MPa). On the other hand, the ring component 30A is, for example, carbon steel, an alloy of iron and carbon. The carbon content of the carbon steel is preferably 0.02 to 2.14% by weight, and more preferably 0.25 to 0.60% by weight. The carbon steel preferably has a Young's modulus of 200 to 220 GPa (more preferably 205 GPa), a tensile strength of 650 MPa or more (more preferably 686 MPa or more), and a yield point of 450 to 550 MPa (more preferably 490 MPa).

[0012] The materials are not limited to those mentioned above. Examples of materials for the ring component 30A include copper alloys, aluminum alloys, nickel alloys, titanium alloys, magnesium alloys, pure iron, carbon steel, and alloy steels. Examples of materials for the cartridge body 20A include copper alloys, aluminum alloys, nickel alloys, titanium alloys, magnesium alloys, pure iron, carbon steel, alloy steels, and resins. These materials can be arbitrarily combined. Among these, from the viewpoint of low-cost manufacturing, it is preferable to use alloy steel for the ring component 30A and copper alloy for the cartridge body 20A. The rigidity of the alloy steel is preferably, for example, a Young's modulus of 200 to 220 GPa (more preferably, 210 to 214 GPa), a tensile strength of 950 MPa or more (more preferably, 980 MPa or more), and a yield point of 800 to 900 MPa (more preferably, 835 MPa).

[0013] The cartridge 10A of this embodiment is manufactured as follows. That is, the cartridge body 20A is manufactured by drawing using a press, like a general cartridge. On the other hand, the ring component 30A is manufactured by punching out a metal sheet using a press and then cutting the tapered surface 18T. At this time, the inner opening edge of the ring component 30A is chamfered to allow the detonator housing 17 to be press-fitted. Then, the ring component 30A is press-fitted around the outside of the detonator housing 17 to complete the cartridge 10A.

[0014] 3, the outer surface of the detonator housing 17 may be provided with a plurality of protrusions 17T that are crushed by the press-fitting of the ring part 30A. The method of fixing the cartridge body 20A and the ring part 30A is not limited to press-fitting, and for example, the cartridge body 20A and the ring part 30A may be fixed in a fitted state with an adhesive, or the ring part 30A may be fixed to the cartridge body 20A by shrink fitting.

[0015] A bullet is manufactured using cartridge 10A as follows: Gunpowder is filled into cartridge 10A, and a bullet (not shown) is fitted into neck 11. A detonator 50 is fitted into detonator fitting hole 15, as shown in Figure 2. Detonator 50 contains ignition metal 52 and explosive powder 53 inside cup-shaped detonator body 51.

[0016] This completes the description of the configuration and manufacturing method of cartridge 10A of this embodiment. When cartridge 10A is placed in the chamber of a gun and detonator 50 is struck, the gunpowder inside cartridge 10A burns, increasing chamber pressure and firing a bullet. At this time, body 13 of cartridge 10A expands, but because it is supported from the outside by the inner surface of the gun's chamber, expansion and deformation are suppressed. Furthermore, because body 13 expands and fits tightly to the inner surface of the chamber, the combustion gases of the gunpowder are prevented from leaking rearward through the gap between the chamber and body 13.

[0017] Incidentally, the head portion 14 of the cartridge 10A is located outside the chamber of the gun. Therefore, it cannot be supported by the inner surface of the chamber. However, in the cartridge 10A of this embodiment, a ring component 30A, which is more rigid than the cartridge body 20A, is fitted to the outside of the detonator housing 17, so that the radial expansion and deformation of the detonator housing 17 when the bullet is fired is suppressed more than in the past. This suppresses the occurrence of a gap between the detonator 50 and the inner surface of the detonator fitting hole 15, and suppresses the occurrence of a problem in which combustion gas in the cartridge 10A leaks rearward from the detonator fitting hole 15 of the detonator housing 17.

[0018] [Second embodiment] 4A, the ring component 30B constitutes only the portion of the rim 18 of the cartridge 10B from the middle portion in the radial direction toward the tip side of the cartridge 10B. In detail, the cartridge body 20B of the present embodiment is provided with an expanded diameter portion 17D, which is expanded in a stepped shape, at the end of the detonator housing portion 17, and the rim 18 of the cartridge 10B is constituted by the expanded diameter portion 17D and the ring component 30B.

[0019] [Third embodiment] The cartridge body 20C of the cartridge 10C of this embodiment shown in Figure 4B has a stepped reduced diameter portion 17A at the end of the detonator housing portion 17, and a ring part 30C is fitted to the outside of the reduced diameter portion 17A, with the outer edge of the ring part 30C forming a rim 18.

[0020] [Fourth embodiment] 5A, a cartridge body 20D of a cartridge 10D of this embodiment is provided with an annular recess 17B at the end of the detonator housing 17, and a ring part 30D is fitted into the inner surface of the annular recess 17B. A rim 18 is integrally formed with the cartridge body 20D.

[0021] [Fifth embodiment] In the cartridge 10E of this embodiment shown in Figure 5B, the ring part 30E is cylindrical and extends over the entire area of ​​the head portion 14, and an annular protrusion 31 that forms the rim 18 of the cartridge 10E protrudes from its end, and a groove portion 19 is formed between the annular protrusion 31 and the body 13 of the cartridge main body 20E.

[0022] <Additional Notes> The following describes the features extracted from the above embodiment, while indicating, as necessary, the effects, etc. Note that, for ease of understanding, the corresponding configurations in the above embodiment are indicated in parentheses as appropriate below, but these features are not limited to the specific configurations indicated in parentheses.

[0023] [Feature 1] A cartridge (10A) comprising a cartridge body (20A) having a detonator housing section (17) at its end for housing a detonator (50), and a ring part (30A) fitted to the outside of the detonator housing section (17) and constituting the head section (14) of the cartridge (10A) together with the detonator housing section (17), wherein the material constituting the ring part (30A) is more rigid than the material constituting the cartridge body (20A).

[0024] [Feature 2] The cartridge (10A) according to Feature 1, wherein the cartridge body (20A) is made of a copper alloy and the ring component (30A) is made of an iron alloy.

[0025] [Feature 3] The cartridge (10A) according to Feature 1 or Feature 2, wherein the ring part (30A) is fixed to the outside of the detonator housing part (17) by press fitting or adhesive.

[0026] [Feature 4] The cartridge (10A) according to Feature 3, further comprising a protrusion (17T) that is crushed by press-fitting on one of the ring part (30A) and the press-fit portion of the cartridge body (20A).

[0027] [Feature 5] The cartridge (10B) according to any one of features 1 to 4, wherein the ring component (30B) constitutes only a portion of the rim (18) of the cartridge (10B) from a radially intermediate portion to a tip end portion.

[0028] [Feature 6] A cartridge (10A) according to any one of features 1 to 4, wherein the outside of the detonator housing (17) is provided with a cylindrical surface extending with a uniform outer diameter, and the ring part (30A) is fitted onto the end of the cylindrical surface to form a rim (18) of the cartridge (10A).

[0029] [Feature 7] A cartridge (10C) according to any one of features 1 to 4, wherein the end of the detonator housing (17) is provided with a reduced diameter section (17A) whose outer diameter is reduced in a stepped manner, the ring part (30C) is fitted into the reduced diameter section (17A), and the outer edge of the ring part (30C) forms the rim (18) of the cartridge (10C).

[0030] In the cartridges of features 1 to 7, a ring part that is more rigid than the cartridge body is fitted to the outside of the detonator housing portion, so that the expansion and deformation of the detonator housing portion when the bullet is fired is suppressed more than before, and the occurrence of a problem in which combustion gas inside the cartridge leaks to the rear of the detonator housing portion can be suppressed.

[0031] Although the present specification and drawings disclose specific examples of the technology included in the scope of the claims, the technology described in the claims is not limited to these specific examples, but also includes various modifications and variations of the specific examples, and also includes parts of the specific examples taken out alone. [Explanation of symbols]

[0032] 10A~10E cartridges 14 Head 15 Detonator housing hole 17 Detonator compartment 17A Reduced diameter part 17T protrusion 18 rims 20A~20E cartridge body 30A~30E Ring parts 50 Detonator

Claims

1. a cartridge body having a detonator housing portion at an end thereof for housing a detonator; A ring part is fitted to the outside of the detonator housing part and forms a head part of the cartridge together with the detonator housing part, A cartridge in which the members constituting the ring components are more rigid than the members constituting the cartridge body.

2. the cartridge body is made of a copper alloy; 2. The cartridge of claim 1, wherein the ring component is an iron alloy.

3. 2. The cartridge according to claim 1, wherein the ring part is fixed to the outside of the detonator housing by press-fitting or adhesive.

4. 4. The cartridge according to claim 3, wherein one of the ring part and the press-fit portion of the cartridge body is provided with a protrusion that is crushed by press-fitting.

5. 5. A cartridge according to claim 1, wherein the ring component constitutes only a portion of the rim of the cartridge that is closer to the tip end than a radially intermediate portion.

6. The detonator housing has a cylindrical surface extending with a uniform outer diameter on the outside, 5. A cartridge according to claim 1, wherein the ring component is fitted onto an end of the cylindrical surface to form a rim of the cartridge.

7. The end of the detonator housing is provided with a reduced diameter portion whose outer diameter is reduced in a stepped manner, 5. A cartridge according to claim 1, wherein the ring part is fitted onto the reduced diameter portion, and the outer edge of the ring part forms a rim of the cartridge.

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