JP4192743B2 - High specific gravity resin composite bullet - Google Patents

Description

  The present invention relates to a bullet made of a high specific gravity resin composite material used for shots of shotguns for hunting and / or clay shooting.

  Many bullets have been used for this type of shot. This lead-made bullet has a characteristic that it is excellent in elasticity due to its high specific gravity, is soft, and has plasticity, so that damage to the barrel can be prevented when the bullet is fired.

  However, its use is being restricted due to the toxic nature of lead, and bullets made of a composite material of, for example, tungsten powder and thermoplastic resin or thermoplastic elastomer have been developed as a harmless material to replace this lead. (For example, Patent Document 1).

However, in the bullets made of the above-mentioned conventional composite material, since the thermoplastic resin or the thermoplastic elastomer is used as the binder of the tungsten powder, the heat resistance against frictional heat in the barrel at the time of bullet firing is not sufficient. In addition, there is a drawback in that the landing elasticity is lowered due to thermal deformation of the bullet.
JP 2000-154256 A

  The present invention has been made in view of the above circumstances, and has an object to provide a bullet made of a high specific gravity resin composite material that has a high specific gravity and plasticity equal to or higher than that of lead and can sufficiently withstand frictional heat at the time of launch. It is said.

  In order to solve the above-mentioned problems, the invention described in claim 1 contains 2.0 to 4.0% by weight of a thermoplastic resin, 0.3 to 1.0% by weight of a thermosetting resin, and iron. 5 to 20% by weight of a powder of one or more substances selected from the group of nickel and copper, and the balance is composed of tungsten powder or tungsten alloy powder and inevitable impurities, and the specific gravity is adjusted to 10 to 13 It is characterized by being.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the thermoplastic resin has a glass transition temperature (Tg) of 0 ° C. or less.

According to invention of Claim 1 or 2 , 2.0-4.0 weight% thermoplastic resin, 0.3-1.0 weight% thermosetting resin, and 5-20 weight% Using the powder of one or more substances selected from the group of iron, nickel and copper, and the remaining tungsten powder or tungsten alloy powder and inevitable impurities as raw materials, the raw materials are kneaded and maintained in a high temperature atmosphere. The thermoplastic resin and the thermosetting resin are melted and a curing reaction is caused to occur in the thermosetting resin, and then the raw material is cooled to a temperature lower than the curing temperature of the thermoplastic resin in a state where the raw material is poured into a mold for molding a sphere, for example. Thus, a bullet made of a high specific gravity resin composite material can be obtained.
In addition, after kneading the raw materials, and after making into a powder form, for example, after putting into a mold for molding a sphere and performing compression molding, holding in a high temperature atmosphere, melting the thermoplastic resin and the thermosetting resin, For the thermosetting resin, a bullet made of a high specific gravity resin composite material can be obtained also by cooling after causing a curing reaction.

  That is, bullets made of a high specific gravity resin composite material having a desired shape can be efficiently produced using a molding method such as injection molding or compression molding.

  In this case, the specific gravity is adjusted by adjusting the addition amount of one or more substances selected from the group of iron, nickel and copper to the high specific gravity tungsten powder or tungsten alloy powder in the range of 5 to 20% by weight. Can obtain a high specific gravity equivalent to or higher than that of 10-13.

  Moreover, since the thermoplastic resin is contained in an amount of 2.0 to 4.0% by weight, it can be easily filled into the above-mentioned mold by melting by heating, and as a binder when powder compression molding is performed. Since it acts, the strength of the molded body can be ensured and the thermosetting resin is contained in an amount of 0.3 to 1.0% by weight, so that it has excellent heat resistance enough to withstand frictional heat in the barrel during bullet firing. You can get things.

  Therefore, it is possible to provide a bullet made of a high specific gravity resin composite material that has a high specific gravity and plasticity equal to or higher than that of lead and can sufficiently withstand frictional heat at the time of launch.

  The content of the thermoplastic resin is set to 2.0 to 4.0% by weight. If the content is less than 2.0% by weight, sufficient plasticity and strength for filling and molding the above-described mold can be obtained. This is because when the content exceeds 4.0% by weight, the specific gravity is less than 10 and a specific gravity equal to or higher than that of lead cannot be obtained.

  Moreover, the content of the thermosetting resin is set to 0.3 to 1.0% by weight, and if it is less than 0.3% by weight, heat resistance sufficiently withstanding frictional heat in the barrel at the time of bullet firing is obtained. This is because when the amount exceeds 1.0% by weight, the elasticity and plasticity are deteriorated, and the barrel is easily damaged and a bullet is easily generated when the bullet is fired.

  According to the invention described in claim 2, since a thermoplastic resin having a glass transition temperature (Tg) of 0 ° C. or lower is used, sufficient elasticity can be obtained even in use at normal atmospheric temperature, It is possible to prevent the barrel from being damaged when the bullet is fired, and since it has plasticity, it is deformed at the time of landing, and the occurrence of a bullet can be prevented.

  As the thermoplastic resin, a crystalline polyester resin or an amorphous polyester resin having a glass transition temperature (Tg) of 0 ° C. or lower is preferable. Moreover, a phenol resin is suitable as the thermosetting resin.

Embodiments of the present invention will be described below.
The bullet made of high specific gravity resin composite material shown in this embodiment contains 2.0 to 4.0% by weight of a crystalline polyester resin (thermoplastic resin) having a glass transition temperature (Tg) of 0 ° C. or less. (Thermosetting resin) is contained in an amount of 0.3 to 1.0% by weight, and a powder of one or more substances selected from the group of iron, nickel and copper is contained in an amount of 5 to 20% by weight, the balance being tungsten powder and It has a composition composed of inevitable impurities and has a specific gravity of 10 to 13.

  Note that a tungsten alloy powder may be used instead of the tungsten powder or together with the tungsten powder. Examples of the tungsten alloy powder include tungsten / nickel alloy powder and tungsten / chromium alloy powder.

  Both the tungsten powder and the tungsten alloy powder have a particle size distribution with a particle size of 0.4 to 50 μm.

  Also about each powder of iron, nickel, and copper, the thing of a particle size distribution of 0.4-50 micrometers is used. However, these iron, nickel, and copper powders are used as necessary or used properly to adjust the specific gravity to 10 to 13 as described above.

  Further, as shown in FIG. 1, the bullet made of high specific gravity resin composite material has a reference diameter D at the position of the equator C and a radius of the spherical surface 1 positioned above and below the equator C is set to 0.45 to 0.85D. , It is formed in a spherical shape in which the height H in the vertical direction perpendicular to the plane passing through the equator C is 0.9 to 1.1D. Further, at the position of the equator C, a cylindrical portion 2 having the equator C as a center line in the vertical direction is provided. As for this cylindrical part 2, the diameter of the outer peripheral surface becomes the said reference | standard dimension D. As shown in FIG. As the reference diameter D, for example, a diameter of 1.25 to 9 mm is adopted.

  FIG. 1 shows a bullet made of a high specific gravity resin composite material having a reference diameter D of 4 mm. (A) shows a radius of 0.45 D (1.8 mm) above and below the equator C. A bullet having a spherical surface 1 and a height H in the vertical direction of 0.9D (3.6 mm) is shown. Further, the cylindrical portion 2 has a thickness T in the vertical direction of its outer peripheral surface of 0.2 to 0.3 D (0.25 D (1 mm) in this embodiment).

  FIG. 1B shows a bullet whose upper and lower spherical surfaces 1 have a radius of 0.45D (1.8 mm) and whose height H in the vertical direction is 1.1D (4.4 mm). The thickness T in the vertical direction on the outer peripheral surface of the cylindrical portion 2 is 0.45 to 0.55 D (0.5 D (2 mm) in this embodiment).

  FIG. 1C shows a bullet whose upper and lower spherical surfaces 1 have a radius of 0.5D (2 mm) and whose height H in the vertical direction is 0.9D (3.6 mm). Further, the thickness T in the vertical direction on the outer peripheral surface of the cylindrical portion 2 is 0.25 to 0.35D (0.3D (1.2 mm) in this embodiment).

  FIG. 1D shows a bullet whose upper and lower spherical surfaces 1 have a radius of 0.5D (2 mm) and whose height H in the vertical direction is 1.1D (4.4 mm). Further, the thickness T in the vertical direction on the outer peripheral surface of the cylindrical portion 2 is 0.5 to 0.6 D (0.55 D (2.2 mm) in this embodiment).

  FIG. 1E shows a bullet whose upper and lower spherical surfaces 1 have a radius of 0.85D (3.4 mm) and whose vertical height H is 0.9D (3.6 mm). Further, the thickness T in the vertical direction on the outer peripheral surface of the cylindrical portion 2 is 0.6 to 0.7 D (in this embodiment, 0.65 D (2.6 mm)).

  FIG. 1F shows a bullet whose upper and lower spherical surfaces 1 have a radius of 0.85D (3.4 mm) and whose vertical height H is 1.1D (4.4 mm). In addition, the vertical thickness T of the outer peripheral surface of the cylindrical portion 2 is 0.8 to 0.9 D (0.85 D (3.4 mm) in this embodiment).

  Next, the effect of the high specific gravity resin composite material bullet configured as described above will be described. This high specific gravity resin composite bullet is added to adjust the specific gravity of 2.0 to 4.0 wt% of crystalline polyester resin, 0.3 to 1.0 wt% of phenol resin. A raw material consisting of -20% by weight of one or more substances selected from the group consisting of iron, nickel and copper and the remaining tungsten powder and unavoidable impurities are kneaded and maintained in a high temperature atmosphere, thereby maintaining crystallinity. High specific gravity resin by melting polyester resin and phenol resin, causing phenol resin to undergo curing reaction, and then cooling the raw material below the curing temperature of crystalline polyester resin in a state where it is injected into a mold for molding bullets A composite bullet is obtained.

  That is, bullets made of a high specific gravity resin composite material having the above-described shape can be efficiently produced using a molding method such as injection molding or compression molding.

  In this case, by adjusting the addition amount of one or more substances selected from the group of iron, nickel and copper to the high specific gravity tungsten powder (or tungsten alloy powder), the specific gravity is equal to or more than 10 to 13 lead. High specific gravity can be obtained.

  In addition, since the crystalline polyester resin is contained in an amount of 2.0 to 4.0% by weight, the above-described mold can be easily filled by melting by heating, and the phenol resin is added in an amount of 0.3 to Since 1.0% by weight is contained, it is possible to obtain a material having excellent heat resistance that can sufficiently withstand the frictional heat in the barrel when the bullet is fired.

  Therefore, it is possible to provide a bullet made of a high specific gravity resin composite material that has a high specific gravity and plasticity equal to or higher than that of lead and can sufficiently withstand frictional heat at the time of launch.

  In addition, since a crystalline polyester resin having a glass transition temperature (Tg) of 0 ° C. or less is used, sufficient elasticity is obtained even when used at normal atmospheric temperature, and damage to the barrel during bullet firing is achieved. In addition to being able to prevent, since it has both plasticity, it will be deformed at the time of landing, and the occurrence of a bullet can be prevented.

  Further, the reference diameter at the position of the equator C is D, the radius of the spherical surface positioned above and below the equator C is 0.45 to 0.85 D, and the height H in the direction orthogonal to the plane passing through the equator C is 0. Since it is formed in a spherical shape of 9 to 1.1D, it is possible to improve the wearing elasticity.

  Moreover, by making the shape as shown in FIGS. 1A to 1F, a bullet made of a high specific gravity resin composite material is molded by a mold that divides the equator C or the upper end or lower end of the cylindrical portion 2 as a boundary. Therefore, productivity can be improved when the above-described injection molding or compression molding is used.

  In addition, the content of the crystalline polyester resin is set to 2.0 to 4.0% by weight, and if it is less than 2.0% by weight, sufficient plasticity for filling and molding the above-described mold can be obtained. This is because if the content exceeds 4.0% by weight, the specific gravity is less than 10 and it is difficult to obtain a specific gravity equal to or higher than that of lead.

  Moreover, the content of phenol resin is set to 0.3 to 1.0% by weight, and if it is less than 0.3% by weight, heat resistance sufficient to withstand frictional heat in the barrel during the bullet firing can be obtained. This is because if it exceeds 1.0% by weight, the elasticity and plasticity are deteriorated, and the barrel is easily damaged and a bullet is easily generated when the bullet is fired.

  Further, the radius of the spherical surface 1 is set to 0.45 to 0.85D. If the radius is less than 0.45D, a sticking phenomenon to the mold occurs after molding, and it becomes difficult to pay out from the mold. If it exceeds 85, the sphericity will decrease and the desired landing elasticity will not be obtained.

  The reason why the height H is set to 0.9 to 1.1D is that the sphericity is reduced outside this range, and the desired wearing elasticity cannot be obtained.

Needless to say, the bullet may be formed in a spherical shape with a reference diameter D. in this case,. It is preferable to form a spherical shape having a sphericity that falls between a minimum spherical surface having a diameter of 0.9D and a maximum spherical surface having a diameter of 1.1D, in order to improve wear resistance.
Further, the burr portion, boundary portion or step generated at the boundary between the cylindrical portion 2 having the equator C as the center line of the thickness in the vertical direction and the upper and lower spherical surfaces 1 is removed or minimized (natural R) , Sagging R) and making it closer to a true sphere is preferable in terms of improving wearing elasticity.

  Also, instead of a crystalline polyester resin having a glass transition temperature (Tg) of 0 ° C. or lower, an amorphous polyester resin having a glass transition temperature (Tg) of 0 ° C. or lower or other glass transition temperature (Tg) of 0 ° C. or lower. The thermoplastic resin may be used. Also about a phenol resin, it may replace with the said phenol resin and may use another thermosetting resin.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the bullet made from the high specific gravity resin composite material shown as one embodiment of this invention, Comprising: (a) is a bullet with a vertical spherical radius of 0.45D and a vertical height of 0.9D. (B) is a front view showing a bullet having a vertical spherical radius of 0.45D and a vertical height of 1.1D, and (c) is a vertical spherical radius of 0.1. 5D is a front view showing a bullet whose vertical height is 0.9D, and (d) is a front view showing a bullet whose upper and lower spherical radii are 0.5D and whose vertical height is 1.1D. And (e) is a front view showing a bullet having an upper and lower spherical radius of 0.85D and a vertical height of 0.9D, and (f) is an upper and lower spherical radius of 0.85D and an upward and downward direction. It is a front view which shows the bullet whose height is 1.1D.

Explanation of symbols

1 Spherical surface C Equatorial D Reference diameter H Height

Claims (2)

  Powder of one or more substances selected from the group of iron, nickel and copper, containing 2.0 to 4.0% by weight of thermoplastic resin, 0.3 to 1.0% by weight of thermosetting resin A bullet made of a high specific gravity resin composite material, characterized by comprising 5 to 20% by weight, the balance being composed of tungsten powder or tungsten alloy powder and inevitable impurities, and having a specific gravity of 10 to 13.   The bullet made from a high specific gravity resin composite material according to claim 1, wherein the thermoplastic resin has a glass transition temperature (Tg) of 0 ° C or lower.

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