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WO2025110932A1 - Plaque de blindage métallique pare-balles et procédé de production - Google Patents

Plaque de blindage métallique pare-balles et procédé de production Download PDF

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Publication number
WO2025110932A1
WO2025110932A1 PCT/TH2023/000027 TH2023000027W WO2025110932A1 WO 2025110932 A1 WO2025110932 A1 WO 2025110932A1 TH 2023000027 W TH2023000027 W TH 2023000027W WO 2025110932 A1 WO2025110932 A1 WO 2025110932A1
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WIPO (PCT)
Prior art keywords
range
temperature
degrees celsius
weight
metal armor
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PCT/TH2023/000027
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English (en)
Inventor
Chonlada RATTANAWONGSA
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Individual
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Individual
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Publication of WO2025110932A1 publication Critical patent/WO2025110932A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F41H5/0442—Layered armour containing metal
    • F41H5/045—Layered armour containing metal all the layers being metal layers

Definitions

  • the vehicle used for duty may prevent the officer from getting shot, it is necessary to use a competent vehicle with high and excellent protection.
  • bulletproof vehicles There is a lot of demand for bulletproof vehicles to ensure the safety of officers, but the number of vehicles is not enough to meet the demand due to the excessive cost of procurement.
  • the APC 4X4 REVA MK III wheeled armored vehicle imported from South Africa. The price is about 11 million baht per car. It weighs 7.8 tons, measures 6.
  • the Department of Army Transport the agency that owns the frame of small regular trucks with armor invented and transformed the bulletproof tactical vehicle or armored pickup truck into a 4-door Double Cab pickup, reinforced turbo diesel engine with a thickness of 1 . 0 to 1 .3 centimeters around the roof and the area under the car with bulletproof glass around the car.
  • a small, armored truck results in heavy weight and increases the load on the vehicle's suspension or suspension system. This results in decreased performance.
  • NIJ standards are standards related to testing methods for evaluating the ability or effectiveness of bullet protection of body armor set by the National p
  • Pradipta KumarJena et al have studied the selection of appropriate materials, crucial to reduce the weight of armor, and have conducted research on high-strength steel, aluminum alloys and titanium alloys. It is used as armor.
  • the steel plates were subjected to annealing at 300 degrees Celsius for 2, 24 and 48 hours. A slight variation in strength and hardness was observed with increasing time, while it was found that the toughness and strength values of Charpy's bumps subsided.
  • Bullet performance is evaluated by the 7.62 mm and 12.7 mm armor piercing bullets that were hit at an impact angle of 0 degrees. The results show Slight differences in bullet performance when hit with a 7. 62 mm armor-piercing round, and the effectiveness of the armor plate decreased when hit with a 12. 7 mm armor-piercing round. This form of alloy produces satisfactory results but due to the metal alloying steps involved, Therefore causing high production costs.
  • the material and damage model were determined using the form of Johnson-Cook model to simulate material behavior and damage under constant force impact conditions.
  • Altair-Hyper- Works The pattern of penetration was obtained from predictions of maximum ballistic velocity and was found to be consistent with actual experimental data. It is a finite model using armor plates measuring 200x200x50 millimeters, divided into 10 elements along the width of 8 nodes hexagonal bricks, and has a fixed direction and range of bullets. The results showed complete penetration into the armor plate without the bullet being destroyed.
  • M. WasifAlia et al investigated numerical calculations of ballistic protection provided by combinations of armor plates.
  • a 7. 62 mm armor-piercing bullet was used during the experiment to determine the ballistic response of the aluminum plate and the combination of steel plate and aluminum plate. Armor-piercing rounds can penetrate aluminum armor plates. While the inclusion of steel plate armor can stop bullets from penetrating armor. And a finite element modeling method was developed to determine the penetration pattern of the armor plate. A brittle fracture caused by the bending of the bullet core due to an asymmetrical impact is expected, and the resulting fragments of the projectile cannot penetrate the base plate and collapse marks are created, on the surface of the armor plate from the impact of bullet fragments. Numerical models can only predict hole growth and bullet penetration when the base plate is directly affected by a bullet.
  • United States patent US 6698311 has a multi-layered armor design divided into the following sections:
  • the front plate serves to absorb the impact of a high-velocity projectile.
  • the middle sheet which acts as a force absorber, is a foam material with a high porous content of approximately 80 percent, with properties that support the deformation of the front sheet when it receives an impact
  • the last sheet made from titanium, aluminum, steel or composite ceramics with polymer-based materials serves to support the force and is a plate that joins all the sheets together to support the deformation that occurs.
  • This form of armor has three layers of material, resulting in a complex fabrication p
  • the innermost material that serves to support the force is a special material made from a combination of various types of steel, which is difficult to produce and has a high production cost.
  • US Patent US 5364679 includes a design that protects against high-velocity bullets coming from a rifle. It was designed from a combination of many components.
  • the outer component consists of a layer of flexible material.
  • an armor plate that is a material that has impact resistance and has a circular material made from glass (Soda lime glass) arranged in two layers next to each other between flexible layers by systematically arranging them next to each other so that there are no gaps. It has the shape of a square and a hexagon connected to each other. Due to the complexity of the bead layer pattern and production details, this form of armor is expensive and difficult to mass produce.
  • the aim of the this invention is to create a more effective bulletproof metal armor plate with the least weight of armor steel by a simple method of heat treatment of the metal plate to obtain armor plates that can protect against bullets according to the National Institute of Justice, NIJ standard test at level 3 of bulletproof metal armor plates for cars fired by 7.62x51 mm.
  • FIG 1 Diagram of method for heat treatment of bulletproof metal armor plates.
  • Bulletproof metal armor plate made of steel material in the shape of a flat sheet and is a single steel sheet with a thickness between 5 mm and 6 mm. all over, which produced by hot rolling using large rollers or presses. When finished producing, it will be in the form of a sheet. It has an alloy structure with high strength, high toughness, good hardening properties and can deeply harden less tendency brittleness excellent machining performance under specific temperature and good appearance after machining also has good welding performance and most importantly, it has excellent shock absorption efficiency.
  • the overall mechanical properties are the ability to resist tensile forces greater than or equal to 100 kgf/mm 2 , yield strength greater than or equal to 85 kgf/mm 2 , elongation greater than or equal to 12%, cross section reduction rate greater than or equal to 45%, impact value greater than or equal to 6 J/cm 2 , hardness ranges from 285 to 352 Vickers Hardness Test and has the following chemical composition.
  • Carbon (C) has a proportion between 0.38% to 0.43% and is an important alloying element of steel, which affects many mechanical properties. Improves hardness and resistance to tensile stress. Increase hardening ability but it has the effect of reducing the toughness and elongation properties of steel. In addition, carbon will combine with other alloying elements such as chromium, molybdenum, tungsten, and form carbide, which will improve properties in various applications, such as hardenability, toughness. Resistant to abrasion and maintaining hardness at high temperatures.
  • Silicon (Si) has a proportion between 0.15% to 0.35%. It is usually in amounts of 0.2 to 0.3% because in the steel smelting process, silicon is used to expel oxygen gas.
  • silicon P(
  • Manganese (Mn) has a proportion between 0.06% to 0.90%. It is a commonly founded element in steel. This is because in the steel production process manganese is added as a gas remover and combines with sulfur (S) with a maximum proportion not exceeding 0.00020%. Manganese is classified as an alloying element in steel only if the amount is higher than 0.6% . Manganese has Its role in increasing the hardenability of steel. The steel mixed with manganese alone has the disadvantage of becoming brittle after tempering in the temperature range of 400 degree Celsius to 600 degrees Celsius. Therefore, manganese is often mixed with chromium (Cr) and molybdenum (Mo), which increases the ability to harden is greater than that of manganese alone.
  • Cr chromium
  • Mo molybdenum
  • Chromium (Cr) has a proportion between 0.90% to 1.20%. It is an alloying element that is added for many properties, such as increasing hardenability, increasing abrasion resistance properties, increasing toughness, etc. Chromium can combine with carbon to form many forms of carbide, which if it is used at high temperatures and these carbides melts completely. The grain will expand a lot. Therefore, the use of steel alloyed with chromium alone Must avoid using at high temperatures and leaving it soaked for a long time or it can be prevented by adding vanadium to slow down the grain expansion.
  • Molybdenum (Mo) has a proportion of between 0.15% to 0.30%. Its advantages include a stable composition and low levels of harmful elements, high iron purity, a small carbon separation layer and few surface defects. It has a low cold crack rate and a maximum tensile strength of 850 to 1 ,0 0 0 megapascal. This material has an exceptionally good balance between strength, toughness, and wear resistance. The chromium content of the alloy provides good hardness permeability, and the molybdenum element provides average hardness and high strength for hardening effect. It also makes it possible to maintain the hardness of martensite up to a temperature of 500 degree Celsius. However, the disadvantage of molybdenum is that iron forms p
  • Nickel (Ni) has a proportion between 0.01% and not more than 0.25 %. It increases the impact resistance of steel. Therefore, it is used in steel that will be surface hardened by mixing it with chromium. This makes the steel highly resistant to corrosion. Not easy to rust and has heat- resistant properties.
  • Phosphorus (P) has a proportion between 0.01% and not more than 0.0030%, destroying the properties of steel. Often accidentally mixed into the steel. It should be as little as possible. These substances are often called impurities. High grade steel must contain no more than 0.03 % to 0.05 % phosphorus.
  • S Sulfur
  • Free Machining steel where sulfur is added up to 0.30 % to create small sulfides distributed throughout the steel. This causes scraps in the unwanted parts to fall off easily, which makes it easy to trim them with machine tools.
  • FIG. 1 a diagram of the heat treatment method for bulletproof metal armor plates.
  • the process begin by preparing bulletproof metal armor plates to the desired size using waterjet cutting technology, which uses high-pressure water to cut apart metal and other materials to cut into narrow angles conveniently and quickly and with high precision. Then it goes through a heat treatment process to change the properties of the metal to suit the conditions in which it will be used. Start by placing the steel sheet in an electric oven, for steel sheets with a thickness of 6 mm, the best temperature is set in range of 725 to 827 degrees Celsius, for sheet steel with a thickness of 5 mm, the best temperature is set at 925 to 1235 degrees Celsius, using a heating ratio that increases by range of 5 to 10 degrees Celsius per minute until the temperature reaches the setting range throughout the sheet.
  • This method causes the temperature of both the furnace and the workpiece to heat up at a similar rate in such a way that the temperature difference between the surface and the center of the steel plate is minimal.
  • the temperature reaches the setting range, the temperature must be maintained for 1 0 to 1 5 minutes.
  • the steel plate with a temperature in the setting range is immersed in water at a water temperature of 25 to 38 degrees Celsius, with the water temperature maintained throughout the process for a period of 0.5 to 3.7 seconds and remove the steel plate from the water for 0.5 to 3.7 seconds, then repeat the immersion p
  • the hardness value of bulletproof metal armor plates after hardening has an average hardness in the range of 590 to 720 kilograms per square millimeter.
  • the hardness value of the outer steel surface on all sides of the armor plate It has a hardness value in the range of 650 to 720 kilograms force per square millimeter and the central part of the steel inside has a hardness value in the range of 586 to 662 kilograms force per square millimeter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

L'invention concerne des plaques de blindage métalliques pare-balles. La société Energis 42 Company Limited estime qu'il est important de créer une plaque métallique pare-balles plus efficace avec un poids en acier de blindage le plus faible possible par un procédé simple de traitement thermique de la plaque métallique pour obtenir des plaques de blindage qui peuvent protéger contre les balles selon le test standard du National Institute of Justice (NIJ) de niveau 3 de plaques de blindage métalliques pare-balles atteintes par des balles NATO FMJ 148 Gr de taille 7,62x51 mm à un angle de 0 degré, à une distance de tir de 15 mètres. Il s'agit là d'une innovation qui peut être étendue à une utilisation commerciale.
PCT/TH2023/000027 2023-11-25 2023-11-27 Plaque de blindage métallique pare-balles et procédé de production Pending WO2025110932A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TH2301007734 2023-11-25
TH2301007734 2023-11-25

Publications (1)

Publication Number Publication Date
WO2025110932A1 true WO2025110932A1 (fr) 2025-05-30

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Family Applications (1)

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PCT/TH2023/000027 Pending WO2025110932A1 (fr) 2023-11-25 2023-11-27 Plaque de blindage métallique pare-balles et procédé de production

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5364679A (en) * 1985-07-02 1994-11-15 Dorothy Groves Flexible armour with energy absorbing half-spheres or hemispherically-shaped bodies
US20120024138A1 (en) * 2010-07-30 2012-02-02 Schott Diamondview Armor Products, Llc Armor panels having strip-shaped protection elements
WO2023135119A1 (fr) * 2022-01-12 2023-07-20 Kennametal Inc. Plaque de blindage, ensemble plaque de blindage et blindage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5364679A (en) * 1985-07-02 1994-11-15 Dorothy Groves Flexible armour with energy absorbing half-spheres or hemispherically-shaped bodies
US20120024138A1 (en) * 2010-07-30 2012-02-02 Schott Diamondview Armor Products, Llc Armor panels having strip-shaped protection elements
WO2023135119A1 (fr) * 2022-01-12 2023-07-20 Kennametal Inc. Plaque de blindage, ensemble plaque de blindage et blindage

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