KR20190107917A - Explosive structure for explosive hardening and explosive hardening method using the same - Google Patents

Abstract

The present invention relates to an explosion structure for explosion hardening and an explosion hardening method using the same wherein an explosive member for a booster is laminated on a plate-shaped hardening explosive member attached to a surface of a metal material to be explosion-hardened, and minimizes a run-up distance in which an explosive is converted into a detonation by detonating the explosive member for hardening with the explosive member for the booster. Accordingly, an entire surface and deep part of a hardening section can be uniformly hardened without damaging an object to be hardened by reaching early a steady-state, thereby greatly improving a quality of a steel material.

Description

Explosive hardening structure for explosion hardening and explosion hardening method using the same {EXPLOSIVE STRUCTURE FOR EXPLOSIVE HARDENING AND EXPLOSIVE HARDENING METHOD USING THE SAME}

The present invention relates to an explosive hardening explosion structure and a method for explosive hardening using the same. More specifically, the explosive hardening explosive structure for improving the phenomenon that the hardness variation during the explosive hardening of a metal material including steel or non-ferrous metal and the explosive hardening using the same The invention relates to a method.

In general, parts of industrial equipment and equipment requiring high wear resistance, such as crossings for railroad turnouts and industrial equipment and equipment requiring high wear resistance, including crossings for conventional railroad turnouts, are made of high manganese cast steel containing 11.5-16.5% manganese. In order to improve the strength of the material and to reduce the brittleness, austenite grains have been formed through solution heat treatment.

These austenitic high manganese steels have toughness, but are soft and have a long work hardening period, and also have inherent disadvantages in deformation and damage of parts during work hardening.

In order to overcome this problem, conventionally, a short-term hardening increase was attempted through additional heat treatment, but the austenite structure was deformed by repeated heat treatment, and thus, high manganese steel had a problem of brittleness, and also for the purpose of pre-hardening. Mechanical methods such as shot blasting and rolling have also been attempted, but there is a problem in that cost and time are increased as compared to simply hardening only the surface.

In order to make up for the disadvantages of the mechanical pre-curing method, an explosion hardening method using explosion energy has been invented.

Explosion hardening method attaches the plate-shaped explosive to the surface of high manganese steel and detonates it, and then hardens due to dislocation, slip and twin deformation in the internal structure of high manganese steel by impact energy generated at this time. To be.

However, in the conventional explosion hardening method, the explosive immediately after the initial explosion reaches a normal deceleration state by increasing the explosive speed of the explosive for a certain period of time, and as a result, the surface hardness of the initial part of the metal to be hardened decreases, so that the hardened parts are not uniform as a whole. There is a problem that the local deformation and damage in the low hardness portion during installation operation.

The parts using austenitic high manganese steel have a characteristic of reaching the limit hardness which no longer increases after about 1 year due to the continuous natural hardening during the use at the low hardness of 200HB at the beginning of installation. The problem is that due to the low hardness and uneven hardness at the beginning of installation, the parts are locally deformed and damaged due to external impact during use, so that continuous replacement or repair work is inevitable.

For example, the crossing of the railroad track diverter using high manganese steel is separated from the nose and wing at regular intervals due to its structural characteristics. There is a section of jumping from wing to nose, and the impact load of the train is continuously applied to the pointed part of nose, and low surface hardness and uneven hardness at the beginning of the crossing installation. This results in local plastic deformation and damage of the nose, which can lead to a bad ride of the train or, in severe cases, the risk of train derailment, which can be time-consuming and expensive to check and maintain after installation. Situation.

In addition, roller tires and table liners used in coal-fired power plants and ore grinders in cement plants have cast steel inside and steel wear-resistant alloy outside for the purpose of providing wear resistance. Complexity and expensive wear-resistant alloy cost, quality integrity of the welding weld, and the maintenance of the regular welding weld after use is inevitable.

Prior Patent Document: Korean Patent Publication No. 2003-0072014 'Manganese Crossing for Railroad Branch and Manufacturing Method thereof' (published Sep. 13, 2003)

An object of the present invention is to laminate a booster explosive member on a plate-shaped hardening explosive member attached to the surface of a metal material to be exploded and detonate the explosive member for curing with a booster explosive member to convert the explosive into explosives. Explosion hardening structure that can harden the entire surface and core of hardened section uniformly without damaging the hardened object by minimizing run-up distance and reaching the steady-state early, and explosion hardening method using the same To provide.

In order to achieve the above object, the explosive hardening explosive structure according to the present invention is located on the surface of a metal material that is subject to explosive hardening, a hardening explosive member for hardening the metal material by explosion, and a part of the hardening explosive member. The laminated portion and the remaining portion is characterized in that it comprises a booster explosive member for protruding in the direction of the detonation point from one side of the curing explosive member, primer portion for detonating the booster explosive member.

In the present invention, the primer portion may be located above the end side of the booster explosive member for protruding to one side of the curing explosive member.

The explosive member for curing in the present invention is a plate-shaped explosive containing at least one molecular explosive 60wt% to 70wt% of PETN, RDX, TNT, HMX, the explosive member for booster is at least any of PETN, RDX, TNT, HMX One molecular explosive may comprise 60 wt% to 77 wt%.

In the present invention, the explosive member for the booster may have a greater explosive force than the curing explosive member because the content of the molecular explosive is 1 to 10% more than the content of the molecular explosive included in the curing explosive member.

In the present invention, the curing explosive member is a plate-shaped explosive having a thickness of 1mm ~ 5mm, the booster explosive member may have a thickness in the range of 0.3 ~ 1 times the thickness of the curing explosives.

In the present invention, the booster explosive member includes a laminated portion overlapping with the curing explosive member, protruding toward one side of the curing explosive member, and an extension portion not overlapping with the curing explosive member, wherein the laminated portion has a length of 10 to 50 mm. Has a length, the extension may have a length of 50 ~ 80mm.

In the present invention, the booster explosive member is located at the center of the width direction of the curing explosive member on a plane, it may have a width of 7 ~ 12mm.

In the present invention, the metal material is high manganese steel containing 11.5 wt% to 16.5 wt% of manganese, and the length of the extension portion may be longer as the manganese content in the high manganese steel is higher.

In the present invention, the curing explosive member is a plate-shaped explosive that can cover the entire surface of the metal material, is formed in a size and shape to match the surface of the metal material so that the outer surface of the metal material to match the outer peripheral of the metal material Can be overlaid and attached.

In order to achieve the above object, the explosion-curing method according to the present invention comprises placing a curing explosive member for curing a metal material by explosion on a surface of a metal material that is subject to explosion-curing, by exploding on the surface of the curing explosive. Laminating a booster explosive member for detonating a curing explosive, detonating the booster explosive member with a primer part, and curing the explosive member for explosion by the detonated explosive member for booster to cure a metal material; It is characterized by including.

Positioning the curing explosive member in the present invention may be located covering the entire surface of the metal material with a plate-shaped curing explosive member.

In the present invention, the curing explosive member is a plate-shaped explosive containing at least one molecular explosive of 60 wt% to 70wt% of PETN, RDX, TNT, HMX, the explosive member for booster is at least of PETN, RDX, TNT, HMX It may be a plate-shaped explosive including one molecular explosive 60wt% ~ 77wt%.

In the present invention, the explosive member for the booster may have a greater explosive power than the curing explosive member because the content of the molecular explosive is 1 to 10% more than the content of the molecular explosive included in the curing explosive member.

In the present invention, the curing explosive member is a plate-shaped explosive having a thickness of 1mm ~ 5mm, the booster explosive member may have a thickness within the range of 0.3 ~ 1 times the thickness of the curing explosives.

In the present invention, the step of stacking the explosive member for the booster is a length of the booster member exploded on the curing explosive member in a length of 10 to 50mm, protruding in one side of the curing explosive member in a length of 50 ~ 80mm It may be laminated to have.

In the present invention, the metal material is high manganese steel containing 11.5wt% to 16.5wt of manganese, and the step of stacking the explosive member for the booster is such that the higher the manganese content of the metal material, the length protruding toward one side of the hardening explosive member. The longer the explosive member for the booster can be laminated.

In the present invention, the step of detonating the explosive member for the booster to the primer portion is located after the primer portion on the top of the end side of the booster explosive member extending to protrude to one side of the curing explosive member for the booster explosive member One end of the side can be detonated.

The present invention laminates a booster explosive member on a plate-shaped hardening explosive member attached to the surface of a metal material to be exploded, and triggers the explosive member to explode by detonating the explosive member for hardening with a booster explosive member (run). By minimizing the -up distance to reach the steady-state early, the entire surface and the core of the hardened section can be uniformly cured without damage to the hardened object, thereby greatly improving the quality of the steel.

1 and 2 is a schematic diagram showing an embodiment of an explosion-curing explosion structure according to the present invention.
3 is a process diagram of the explosion curing method according to the present invention.
4 is a graph showing a CJ point (chapman-jouguet Point) and Rayleigh line (Rayleigh line).
5 is a graph showing the length of the reaction zone to detonate in deflagration.
6 is a graph showing the impact of the booster explosive power and the explosive charge explosives.
7 to 9 are schematic views showing comparative examples of the explosion curing method according to the present invention.
FIG. 10 is a graph comparing the average value of Brinell hardness and the variation of Brinell hardness with respect to the cured surface of the first and second comparative examples of the present invention and the first to third embodiments of the present invention. FIG.

The present invention is explained in more detail.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention. Prior to the detailed description of the invention, the terms or words used in the specification and claims described below should not be construed as limiting in their usual or dictionary meanings. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 and 2 is a schematic diagram showing an embodiment of an explosion-curing explosion structure according to the present invention, Figure 1 is a side view showing an embodiment of the explosion-curing explosion structure according to the present invention. Figure 2 is a plan view showing an embodiment of an explosion-curing explosion structure in accordance with the present invention.

1 and 2, an embodiment of the explosive hardening explosive structure according to the present invention is located on the surface of the metal material 10 that is subject to the explosive hardening and the explosives for curing the hardening of the metal material 10 by explosion. The member 100 is included.

The curing explosive member 100 is an example of a plate-shaped explosive that can cover the entire surface of the metal material 10.

The curing explosive member 100 is formed in a size and shape that matches the surface of the metal material 10 so as to cover and attach the surface of the metal material 10 so that the outer circumference matches the outer circumference of the metal material 10. .

The booster explosive member 200 is disposed on the upper part of the curing explosive member 100, and the booster explosive member 200 is partially stacked on the upper part of the curing explosive member 100, and the remaining part is the detonation point. Positioned to protrude in a direction.

Booster explosive member 200 has a primer portion 300 is located on the upper surface, detonated by the primer portion 300 serves to detonate the explosive member 100 for curing.

For example, the metal material 10 includes steel or non-ferrous metal material 10 including iron.

Steel is an example of high manganese steel containing Mn: 11.5 ~ 16.5wt%, or stainless steel containing Ni: 8 ~ 12wt% Cr: 18wt% ~ 22wt%.

Steel is a well-known manganese cast steel product containing Mn: 11.5 ~ 16.5wt% .Crawler shoe of heavy duty equipment such as excavators, bulldozers, shovels, etc. Required parts such as pipes for petroleum slurry transfer, roll tires and table liners used for crushing ore in coal-fired power plants and cement plants, and pads and chutes for iron ore transfer conveyor belts in steel mills. It is to be noted that a more detailed description that can be carried out in a variety of modifications to the known high manganese steel for manufacturing the product is omitted.

It is to be understood that the nonferrous metal material may include a nickel alloy, a titanium alloy, a titanium alloy, an aluminum alloy, and it is understood that the nonferrous metal material includes all known metals and nonmetals that are subject to explosion hardening.

The curing explosive member 100 is an example of a plate-type explosive extruded, molded with PETN, RDX, TNT, HMX-based molecular explosives, binders, plasticizers and the like.

In addition, the explosive member 200 for booster is an example of a plate-shaped explosive extruded, molded with PETN, RDX, TNT, HMX-based molecular explosives, binders, plasticizers and the like.

For example, the curing explosive member 100 is an example of a plate-shaped explosive containing at least one molecular explosive 60wt% ~ 70wt% of PETN, RDX, TNT, HMX.

Booster explosive member 200 includes at least one molecular explosive 60wt% ~ 77wt% of PETN, RDX, TNT, HMX, the content of molecular explosives compared to the content of molecular explosive included in the curing explosive member 100 Including the 1 to 10% more explosive force is 1 to 10% stronger than the explosive force of the explosive member for curing 100 is an example.

When the explosive power of the booster explosive member 200 is greater than 10% of the explosive force of the hardening explosive member 100, it detonates the hardening explosive member 100 and transmits the impact to the steel to be cured. By doing so, adverse effects such as cracking may occur on the steel to be hardened.

In addition, the curing explosive member 100 is an example of a plate-shaped explosive having a thickness of 1mm ~ 5mm, the booster explosive member 200 has a thickness in the range of 0.3 ~ 1 times the thickness of the curing explosive. As an example.

In addition, the booster explosive member 200 is stacked on the curing explosive member 100 in a length of 10 to 50mm, and positioned to extend in a length of 50 ~ 80mm in the direction of the detonation point as an example.

In addition, the booster explosive member 200 is located in the center of the width direction of the curing explosive member 100 on a plane, it is an example that has a width of 7 ~ 12mm.

If the width of the booster member 200 for the booster is less than 7mm, the desired effect may not be obtained.If the width of the booster member 200 is less than 7mm, the explosive force is greater than 12mm, and the hardness variation of the hardened metal material or the crack may be generated on the surface. The curing cost is increased.

Booster explosive member 200 is an extension (not overlapping with the curing explosive member 100, the laminated portion 210, protruding to one side of the curing explosive member 100, the curing explosive member 100 ( 220).

That is, the stacking unit 210 is one example having a length of 10 ~ 50mm, the length of the extension 220 is an example having a length of 50 ~ 80mm.

If the length of the laminated part 210 is less than 10mm, the desired effect may not be obtained. If the length of the laminated part 210 is greater than 50mm, the explosive force is large, and there is a risk of depression or cracking on the surface of the hardened metal material.

Primer 300 is an end portion that does not overlap with the curing explosive member 100 in the booster explosive member 200, that is, extending in the detonation direction protruding toward one side of the curing explosive member 100 ( An example is located at the end side of the 220.

If the length of the extension 220 is less than 50mm, the desired effect may not be obtained, and even if it exceeds 80mm, the explosive force increase effect of the curing explosive is insignificant, and there is a problem of increasing ambient noise and increasing curing cost by using explosives more than necessary.

However, the length of the extension 220 may be changed according to the metal material 10, that is, manganese content in the steel, and the longer the manganese content of the steel is longer as an example.

For example, the length of the extension part 220 may be 50 mm when the manganese content in the steel is 13 wt%, and 60 mm when the manganese content in the steel is 16 wt%.

On the other hand, Figure 3 is a process diagram of the explosion hardening method according to the present invention, the explosion hardening method according to the present invention is austenite-based high manganese steel parts local plastic deformation and damage to the initial low hardness is equivalent to a new replacement or reach the limit hardness A method of reaching the required hardness at which a part is used through uniform pre-hardening at the beginning of fabrication to improve the incurred maintenance costs.

Referring to Figures 1 and 3 explosive curing method according to the present invention is the step of placing the explosive curing member 100 for curing the metal member 10 by the explosion on the surface of the metal material 10 to be subjected to the explosion curing ( S100), the step of stacking the booster explosive member 200 for detonating the curing explosives by the explosion on the surface of the curing explosive member 100 (S200), the booster explosive member 200 to the primer portion 300 Detonating step (S300), and the explosion-expanding member for explosion (100) to the explosion-expanded member for explosion (100) includes a step (S400) to cure the metal material (10).

Explosion hardening method according to the present invention includes the step of preparing a metal material 10 that is subject to explosion curing, the metal material 10 is an example that includes a steel or non-ferrous metal material containing iron.

Steel is an example of high manganese steel containing Mn: 11.5 ~ 16.5wt%, or stainless steel containing Ni: 8 ~ 12wt% Cr: 18wt% ~ 22wt%.

The preparing of the metal material 10 may include preparing a high manganese steel including Mn: 11.5 to 16.5 wt%, or preparing a stainless steel including Ni: 8 to 12 wt% Cr: 18 wt% to 22 wt%. .

The step of preparing the metal material (10) is a well-known manganese cast steel containing Mn: 11.5 to 16.5 wt%, which is required for high abrasion resistance, such as crossings for railway track diverters, inner walls of short blast rooms, and tracks, such as excavators and excavators. Pads and chutes for crawler shoes such as bulldozers and shovels, roller tires and table liners used to crush the ore of coal slurry power plants, coal-fired power plants, and cement plants. It will be noted that a more detailed description thereof may be omitted since various modifications may be made to a metal material such as a known high manganese steel for producing a product such as a required component such as.

The preparing of the metal material 10 reveals that a nonferrous metal material of nickel alloy, titanium alloy, titanium alloy, and aluminum alloy can be prepared, and any one of known metals and nonmetals, which are subject to explosion hardening, may be prepared. Make sure it is.

The curing explosive member 100 is an example of a plate-type explosive extruded, molded with PETN, RDX, TNT, HMX-based molecular explosives, binders, plasticizers and the like.

In addition, the explosive member 200 for booster is an example of a plate-shaped explosive extruded, molded with PETN, RDX, TNT, HMX-based molecular explosives, binders, plasticizers and the like.

For example, the curing explosive member 100 is an example of a plate-shaped explosive containing at least one molecular explosive 60wt% ~ 70wt% of PETN, RDX, TNT, HMX.

Booster explosive member 200 includes at least one molecular explosive 60wt% ~ 77wt% of PETN, RDX, TNT, HMX, the content of molecular explosives compared to the content of molecular explosive included in the curing explosive member 100 Including the 1 to 10% more explosive force is 1 to 10% stronger than the explosive force of the explosive member for curing 100 is an example.

When the explosive power of the booster explosive member 200 is greater than 10% of the explosive force of the hardening explosive member 100, it detonates the hardening explosive member 100 and transmits the impact to the steel to be cured. By doing so, adverse effects such as cracking may occur on the steel to be hardened.

Positioning the curing explosive member 100 (S100) is an example of covering the entire surface of the metal material 10 with a plate-shaped curing explosive member 100 and positioned.

In addition, the step (S100) of placing the curing explosive member 100 is a curing explosive member 100 formed in a size and shape that matches the surface of the metal material 10 is the outer circumference of the curing explosive member 100 One example is to cover and attach the surface of the metal material 10 to match the outer periphery of the metal material 10.

In step S200 of stacking the booster explosive member 200, a portion of the booster explosive member 200 is stacked on the upper portion of the curing explosive member 100, and the remaining part is one side of the curing explosive member 100. Position the explosive member 200 for the booster to protrude.

More specifically, the curing explosive member 100 is an example of a plate-shaped explosive having a thickness of 1mm ~ 5mm, the step of stacking the booster explosive member 200 for boosting range of 0.3 ~ 1 times the thickness of the curing explosive Stacking the explosive member 200 for the booster having an inner thickness is one example.

In addition, the step of stacking the booster explosive member 200 (S200) is that the booster explosive member 200 is superimposed on the curing explosive member 100 by a length of 10 to 50mm, the curing explosive member 100 of the For example, the stacking to have a length protruding with a length of 50 ~ 80mm to one side.

In addition, the booster explosive member 200 has a width of 7 ~ 12mm, the step of stacking the booster explosive member 200 is a booster explosive member 200 in the center of the width direction of the curing explosive member 100 on the plane ) Is an example.

The step (S200) of stacking the booster explosive member 200 is adjusted to the length of the explosive member 200 for the booster by adjusting the length projecting to one side of the curing explosive member 100 according to the manganese content of the metal material 10 to be cured. Laminating is taken as an example.

In step S200 of stacking the booster explosive member 200, the higher the manganese content of the metal material 10, the longer the length of the explosive member 200 for the booster protrudes to one side of the curing explosive member 100. Laminating is taken as an example.

For example, the step of stacking the booster explosive member 200 (S200) is the explosive member 200 for the booster to one side of the hardening explosive member 100 when the metallic material 10, that is, the manganese content in the steel is 13wt%. ) Is protruded to 50mm, and when the content of manganese in the steel is 16wt%, one side of the explosive member 100 for curing may be positioned to protrude to 60mm booster member 200.

Step of detonating the booster explosive member 200 to the primer portion 300 (S300) is the end of the booster explosive member 200 extending to protrude the primer portion 300 to one side of the curing explosive member 100 Positioning the primer portion 300 in the upper side of the booster one side of the explosive member 200 for booster is an example.

On the other hand, Figure 4 is a graph showing the CJ point (chapman-jouguet Point) and Rayleigh line (Rayleigh line), Figure 5 is a graph showing the length of the reaction zone to detonate in deflagration.

When explosives are detonated by a detonator bombardment, the explosives go through extremely short periods of several seconds, which grow from deflagration to detonation. The process is described as “CJ point and Rayleigh line” in FIG. can do.

In the pressure-volume change curve (low density wave) due to the explosive decomposition of explosives, the rayleigh line is a straight line connecting the initial and end states of the reaction, and the pressure-volume change curve is larger than the Rayleigh line. The case is called deflagration.

In addition, referring to FIG. 5, as shown in the graph for “reaction zone length for detonation from detonation,” when an explosive is shocked, detonation does not occur instantaneously, and a predetermined distance within the explosive until reaching detonation from detonation is reached. In this case, the distance traveled is called a rundistance, and the rundistance may be shortened as the pressure of shock energy increases.

In addition, as can be seen in the graph of the "explosive effect of the booster explosive power and the alleged explosive power" of Figure 6, if the explosive power with a stronger power attached to the main explosives for booster to detonate, the initial explosion speed of the main explosives rapidly increases It is possible to reach a steady state quickly and operate the entire high manganese hardened section with uniform energy.

Referring to FIG. 6, when the booster energy at the detonation point is increased (a> b), it may be confirmed that the time to reach the steady state is reached.

That is, the explosive hardening explosion structure according to the present invention and the explosive hardening method using the same in the explosion hardening method of the surface of metals and nonferrous metals, the first explosive hardening work 1-5mm thickness explosives for curing the entire surface of the object to be cured It adheres closely, and the booster explosives are double-strengthened in the range of 10 to 50mm above the explosive width for curing at the same time as 0.3 ~ 1 times the thickness of the explosives for curing. The normal speed is reached within the shortest time immediately after detonation.

On the other hand, Figures 7 to 9 is a schematic diagram showing a comparative example of the explosion curing method according to the present invention.

7 to 9, the hardening method of Comparative Examples 1 to 3 uses high manganese steel including 13 wt% of manganese as the metal material 10 to be hardened, and the high manganese steel has a width of 67 mm and 300 mm. It has an example of having a length of.

In addition, in the first to third comparative examples illustrated in FIGS. 7 to 9, the plate-shaped curing explosive 11 and the explosive curing explosive structure according to the present invention shown in FIG. In the embodiment, the plate-type hardening explosive member 100 and the booster explosive member 200 are found to be the same plate-shaped explosive.

7 is a schematic view showing a first comparative example of the explosion curing method according to the present invention, Figure 7 (a) is a schematic diagram of the first comparative example, Figure 7 (b) is a high manganese hardened in the first comparative example It is a figure which illustrates the hardness measurement method of steel materials.

Referring to FIG. 7A, the first comparative example has a width of 2 mm, 3 mm, and 5 mm on the upper part of a high manganese steel having a width of 67 mm and a length of 300 mm and containing 13 wt% manganese (11 mm). ), Respectively, and detonation of the plate-type hardening explosive 11 directly with a primer 12 to explode harden the high manganese steel.

7 (b) is a view illustrating a hardness measurement method of the hard manganese steel hardened in the first comparative example. Referring to FIG. 7 (b), the first comparative example in FIG. 7 (a) is 2 mm and 3 mm. , The briquette hardness (HB) of 3 points per 20mm interval was measured in the direction of detonation of the hardened surface of each explosive hardened high manganese steel by stacking plate-type hardening explosives (11) having a thickness of 5 mm. It is shown in Table 1 below.

   Distance from the beginning of the hardening section (mm) Separation distance (mm) 20 40 60 80 100 120 140 160 180 200 220 240 260 280 Average Deviation Hardness before hardening (HB) 201 195 198 185 183 182 197 188 194 209 194 201 203 195 195 7.9 2 mm (width thick) 234 268 292 303 305 301 306 303 309 304 301 305 330 307 296 20.4 3 mm (width thick) 266 293 325 336 335 342 337 33 334 347 336 341 338 342 329 22.3 5 mm (width thick) 291 318 354 364 351 366 362 365 364 370 363 369 363 371 355 22.7

Hardening section when directly detonating the plate-shaped hardening explosives 11 with a primer 12 in the state of laminating only the plate-shaped hardening explosives 11 on the upper part of the high manganese steel as in Comparative Example 1 as shown in Table 1 Initially, it was confirmed that hardness unevenness occurred in which hardness increased gradually from the low hardness state to the end point of the curing section.

8 is a schematic view showing a second comparative example of the explosion curing method according to the present invention, Figure 8 (a) is a schematic diagram of the second comparative example, Figure 8 (b) is a high manganese cured in a second comparative example It is a figure which illustrates the hardness measurement method of steel materials.

Referring to (a) of FIG. 8, the second comparative example has a width of 67 mm and a length of 300 mm to complement the result of the first comparative example of FIG. 7, and 2 mm and 3 mm on top of the high manganese steel including 13 wt% manganese. , Laminate each of the plate-shaped hardening explosives (11) having a thickness of 5mm, respectively, protruding by extending the length 30mm to one side of the high manganese steel, the end side protruding to one side of the high-manganese steel from the plate-shaped hardening explosives (11) The primer 12 is placed on the upper portion, and the explosive hardening of the plate-shaped hardening explosive 11 with the primer 12 is an example of explosive hardening of the high manganese steel.

8 (b) is a view illustrating a hardness measurement method of a hard manganese steel hardened by the second comparative example. Referring to FIG. 8 (b), 2 mm and 3 mm as the second comparative example of FIG. 8 (a). , The briquette hardness (HB) of 3 points per 20mm interval was measured in the direction of detonation of the hardened surface of each explosive hardened high manganese steel by stacking plate-type hardening explosives (11) having a thickness of 5 mm. It is shown in Table 2 below.

   Distance from the beginning of the hardening section (mm) Separation distance (mm) 20 40 60 80 100 120 140 160 180 200 220 240 260 280 Average Deviation Hardness before hardening (HB) 181 204 192 205 186 195 187 201 203 204 190 197 207 195 196 8.2 2 mm (width thick) 240 266 283 305 308 306 298 304 302 298 307 303 306 307 295 19.7 3 mm (width thick) 271 301 320 340 332 339 346 339 344 338 340 345 340 342 331 21.0 5 mm (width thick) 290 326 365 369 362 351 367 370 362 369 358 370 362 366 356 22.2

As shown in Table 2, in order to supplement the results of the first comparative example, the second comparative example extends the hardening explosive 11 into one side of the high manganese steel by 30 mm and positions the primer 12 on the extended end side. By detonating, it was confirmed whether the initial hardness was increased and the hardness uniformity was increased, but there was no improvement effect at a level similar to that of the first comparative example.

9 is a schematic view showing a third comparative example of the explosion curing method according to the present invention, Figure 9 (a) is a schematic diagram of the third comparative example, Figure 9 (b) is a high manganese cured in a third comparative example It is a figure which illustrates the hardness measurement method of steel materials.

Referring to (a) of FIG. 9, the third comparative example has a width of 5 mm and a thickness of 5 mm on the upper part of the high manganese steel containing 13 wt% of manganese having a width of 300 mm and a length of 300 mm to supplement the result of the first comparative example of FIG. After laminating the metal sheets (SUS304) 13, laminated lamellar curing agent 11 having a thickness of 2 mm, 3 mm, and 5 mm was laminated, respectively, and protruded by extending the length by 10 mm to one side of the high manganese steel, The explosive 11 is an example in which the primer 12 is positioned on the upper end side protruding to one side of the high manganese steel, and the explosive hardening of the high manganese steel is performed by directly detonating the explosive plate 11 for the plate-type hardening with the primer 12. .

9 (b) is a view illustrating a hardness measurement method of the hard manganese steel hardened in the third comparative example. Referring to FIG. 9 (b), in FIG. 9 (a), the third comparative example is 2 mm and 3 mm. , The briquette hardness (HB) of 3 points per 20mm interval was measured in the direction of detonation of the hardened surface of each explosive hardened high manganese steel by stacking plate-type hardening explosives (11) having a thickness of 5 mm. It is shown in Table 3 below.

   Distance from the beginning of the hardening section (mm) Separation distance (mm) 20 40 60 80 100 120 140 160 180 200 220 240 260 280 Average Deviation Hardness before hardening (HB) 192 186 205 207 196 192 181 192 188 204 200 191 199 208 196 8.3 2 mm (width thick) 267 274 315 317 321 314 315 323 320 317 314 318 311 321 311 17.3 3 mm (width thick) 294 311 317 349 354 360 362 358 353 361 359 crack 360 356 346 22.7 5 mm (width thick) 325 341 339 367 381 crack crack crack 390 387 crack 384 396 390 370 25.6

As confirmed in Table 3, in the third comparative example, in order to supplement the results of the second comparative example, the metal sheets (SUS304 and 5t) 13 were placed between the hardening explosives 11 and the high manganese steel, Although the hardness was generally increased by extending the explosive explosive 11 into one side of the high manganese steel and placing the primer 12 on the extended end side, the hardness increased overall, but the impact of the unsteady state of the hardening explosive near the explosion point IP was increased. As a result, it was confirmed that the hardness nonuniformity, in which the hardness was low and gradually increased in the initial stage of the hardening period, occurred similarly, and fine cracks occurred on the surface of the high manganese steel.

Referring to FIG. 1, the first, second, and third embodiments of the present invention have a width of 67 mm and a length of 300 mm, including 13 wt% of manganese, in the same manner as the first to third comparative examples. The high manganese steel was exploded and hardened, and Brinell hardness (HB) of three points per 20 mm interval was measured in the direction of detonation of the hardened surface of the exploded hardened high manganese steel, and the results are shown in Tables 4 to 6 below.

In the first, second and third embodiments of the present invention, the curing explosive member 100 and the booster explosive member 200 are explosives having the same components as those of the curing explosives of the first to third comparative examples. Let's find out.

The first embodiment of the present invention is clear that it is an example using a booster explosive member 200 of width 10mm, thickness 2mm, length 60mm.

That is, according to the first embodiment of the present invention, after lamination of the plate-shaped hardening explosive member 100 of 2 mm, 3 mm, and 5 mm on top of a high manganese steel having a width of 67 mm and a length of 300 mm containing 13 wt% of manganese, respectively, 10 mm overlapping the booster explosive member 200 in the width direction center of each curing explosive member 100 and 50 mm is positioned to protrude to one side of the curing explosive member 100 and then the curing explosive member 100 of the curing explosive member 100. Positioning the primer portion 300 on the upper end side protruding to one side and then detonating the explosive member 200 for booster with the primer portion 300, and detonating the explosives for curing with the explosive member 200 for explosion booster It is an example of explosion hardening of high manganese steel.

For the first embodiment of the present invention, that is, a stacking type of explosives for the plate-shaped curing having a thickness of 2mm, 3mm, 5mm, respectively, and each of the plate-shaped curing explosives member 100 is laminated and the explosive member for the booster protruding to one side The brinell hardness (HB) of three points per 20 mm interval was measured in the direction of detonation of the hardened surface of each explosive hardened high manganese steel by degassing with 200). The results are shown in Table 4 below.

   Distance from the beginning of the hardening section (mm) Separation distance (mm) 20 40 60 80 100 120 140 160 180 200 220 240 260 280 Average Deviation Hardness before hardening (HB) 205 181 194 186 201 198 195 197 183 194 204 185 200 194 194 7.7 2 mm (width thick) 318 320 304 322 325 308 320 305 301 312 320 322 304 321 314 8.4 3 mm (width thick) 336 334 325 322 340 334 326 330 334 323 336 350 356 331 334 9.7 5 mm (width thick) 354 363 341 350 365 345 365 344 353 367 366 360 371 367 358 9.9

In addition, the second embodiment of the present invention will be found that the example using the booster explosive member 200 having a width of 10mm, thickness 2mm, length 80mm.

That is, according to the second embodiment of the present invention, after stacking the explosive members 100 of 2 mm, 3 mm, and 5 mm on the top of a high manganese steel having a width of 67 mm and a length of 300 mm including 13 wt% of manganese, respectively, 30 mm overlap the booster explosive member 200 in the width direction center of each curing explosive member 100 and 50 mm is positioned to protrude to one side of the curing explosive member 100, and then Positioning the primer portion 300 on the upper end side protruding to one side and then detonating the explosive member 200 for booster with the primer portion 300, and detonating the explosives for curing with the explosive member 200 for explosion booster It is an example of explosion hardening of high manganese steel.

For the second embodiment of the present invention, that is to say laminated to each plate-shaped curing explosives having a thickness of 2mm, 3mm, 5mm, each of the plate-shaped curing explosive member 100 is laminated to the booster explosive member (protruding to one side ( The brinell hardness (HB) of three points per 20 mm interval was measured in the direction of detonation of the hardened surface of each explosive hardened high manganese steel by degassing with 200). The results are shown in Table 4 below.

   Distance from the beginning of the hardening section (mm) Separation distance (mm) 20 40 60 80 100 120 140 160 180 200 220 240 260 280 Average Deviation Hardness before hardening (HB) 202 206 193 197 195 184 208 187 185 192 188 193 206 198 195 8.0 2 mm (width thick) 315 319 329 330 315 311 315 330 315 310 320 332 311 330 320 8.3 3 mm (width thick) 335 332 320 349 331 348 351 345 334 330 331 345 348 351 339 9.9 5 mm (width thick) 356 352 350 371 366 356 370 369 370 367 366 375 346 372 363 9.3

The third embodiment of the present invention is found to be an example using a booster explosive member 200 having a width of 10mm, a thickness of 2mm, a length of 100mm.

That is, according to the third embodiment of the present invention, after laminating the plate-type hardening explosive member 100 of 2 mm, 3 mm, and 5 mm on the upper part of a high manganese steel having a width of 7 mm and a length of 300 mm including 13 wt% manganese, respectively, 50 mm overlap the booster explosive member 200 at the center of the width direction of each curing explosive member 100 and 50 mm is positioned to protrude to one side of the curing explosive member 100 and then the curing explosive member 100 of the curing explosive member 100. Positioning the primer portion 300 on the upper end side protruding to one side and then detonating the explosive member 200 for booster with the primer portion 300, and detonating the explosives for curing with the explosive member 200 for explosion booster It is an example of explosion hardening of high manganese steel.

For the third embodiment of the present invention, that is, a laminated plate-shaped curing explosive member 100 having a thickness of 2mm, 3mm, 5mm, respectively, and each plate-shaped curing explosive member 100 is laminated and the booster protruded to one side The brinell hardness (HB) of three points per 20 mm interval was measured in the direction of detonation of the hardened surface of each of the high-manganese steels exploded and hardened by detonation with the dragon explosive member 200. The results are shown in Table 6 below.

   Distance from the beginning of the hardening section (mm) Separation distance (mm) 20 40 60 80 100 120 140 160 180 200 220 240 260 280 Average Deviation Hardness before hardening (HB) 195 207 193 198 192 184 205 187 206 194 186 193 198 205 196 7.6 2 mm (width thick) 329 332 335 333 315 317 318 330 325 330 311 331 314 311 324 8.8 3 mm (width thick) 345 342 347 351 330 344 355 348 342 325 329 340 350 349 343 8.9 5 mm (width thick) 371 361 377 363 361 361 362 374 375 383 355 370 371 376 369 8.1

In the first to third embodiments of the present invention, that is, the booster explosive member 200 is laminated on the plate-shaped hardening explosive member 100 attached to the surface of the metal material 10 to be exploded and cured. The booster explosive member 200 extends to one side of the explosive member 100 so that the booster explosive member 200 is formed to protrude to one side, thereby separating the detonation point of the primer part 300 from the explosive member 100 for curing by 50 mm. And each of the booster explosive members 200 to 10 mm, 30 mm, and 50 mm each extended to the explosive member 100 for curing, thereby strengthening the explosive energy of the curing explosive member 100 by curing the explosive member 100 for curing. By minimizing the unsteady state interval of, it was confirmed that the hardness deterioration of the initial curing period and the hardness nonuniformity of the entire section were significantly improved.

That is, in the present invention, as in the first to third comparative examples, the problem of the conventional explosion hardening method is that the hardness decreases at the initial stage of the hardening section and the entire section due to the presence of an unsteady state section at the initial detonation of the explosive. It is to compensate for the phenomenon that the hardness unevenness, and also to compensate for the problem that the crack occurs in the metal material 10 to be exploded hardening by excessive impact energy by applying the metal sheet.

FIG. 10 is a graph comparing the average value of Brinell hardness and the variation of Brinell hardness with respect to the cured surface of the first and second comparative examples of the present invention and the first to third embodiments of the present invention. Mean value of Brinell hardness and variation of Brinell hardness for the first comparative example identified, mean value of Brinell hardness and variation of Brinell hardness for the second comparative example identified in Table 2, for the first embodiment identified in Table 4 Average value of Brinell hardness and deviation of Brinell hardness, average value of Brinell hardness and Brinell hardness for the second embodiment identified in Table 5, average value of Brinell hardness and Brinell hardness for the second embodiment identified in Table 6 A graph for comparing deviations.

Referring to FIG. 10, the first to third embodiments of the present invention are remarkably different in terms of curing effect (hardness size) and curing uniformity (hardness deviation) when compared with Comparative Examples 1 and 2. You can check it.

The present invention laminates the booster explosive member 200 on the plate-shaped hardening explosive member 100 attached to the surface of the steel, and detonates the hardening explosive member 100 with the booster explosive member 200. By minimizing the run-up distance converted to this detonation, it reaches the steady-state early so that the entire surface and deep parts of the hardened section can be uniformly hardened without damage to the hardened material. It can greatly improve.

The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention, which is understood to be included in the configuration of the present invention.

100: explosive member for curing 200: explosive member for boosters
210: laminated portion 220: extended portion
300: primer

Claims (17)

A hardening explosive member positioned on the surface of the metal material which is subject to explosion hardening and curing the metal material by explosion;
A portion of the booster member for the booster is placed on the upper portion of the curing explosive member and the remaining portion is protruded in the direction of the detonation point from one side of the curing explosive member; And
Explosion hardening explosion structure comprising a primer for detonating the explosive member for the booster.
The method according to claim 1,
The primer part is located on the end side of the booster explosive member for the booster protruding toward one side of the curing explosive member explosive curing for explosion.
The method according to claim 1,
Hardening explosive member is a plate-shaped explosive containing at least one molecular explosive 60wt% ~ 70wt% of PETN, RDX, TNT, HMX,
The explosive member for the booster is explosion-curing structure, characterized in that containing at least one molecular explosive 60wt% ~ 77wt% of PETN, RDX, TNT, HMX.
The method according to claim 1,
The booster explosive member for explosion-curing explosion structure, characterized in that the explosive power is greater than the explosive member for curing by containing 1 to 10% more of the content of the molecular explosives contained in the curing explosive member.
The method according to claim 1,
The curing explosive member is a plate-shaped explosive having a thickness of 1mm ~ 5mm,
The booster explosive member is explosive hardening explosion structure, characterized in that having a thickness within the range of 0.3 ~ 1 times the thickness of the curing explosives.
The method according to claim 1,
The booster explosive member includes a laminated portion overlapping with the curing explosive member;
Protruding to one side of the curing explosive member includes an extension that does not overlap with the curing explosive member,
The laminate has a length of 10 to 50mm,
The length of the extension is explosive curing explosion structure, characterized in that having a length of 50 ~ 80mm.
The method according to claim 1,
The booster explosive member is located in the center of the width direction of the curing explosive member on a plane, the explosion-curing explosion structure, characterized in that having a width of 7 ~ 12mm.
The method according to claim 6,
The metal material is high manganese steel containing 11.5wt% to 16.5wt of manganese,
The length of the extension is explosive hardening explosion structure, characterized in that the longer the higher the manganese content in the high manganese steel.
The method according to claim 1,
The curing explosive member is a plate-shaped explosive that can cover the entire surface of the metal material, is formed in a size and shape that matches the surface of the metal material is attached to cover the surface of the metal material so that the outer periphery coincides with the outer periphery of the metal material Explosion hardening explosion structure, characterized in that.
Placing a curing explosive member for curing the metal material by explosion on a surface of the metal material that is subject to explosion hardening;
Stacking a booster explosive member for detonating the curing explosive by explosion on a surface of the curing explosive;
Detonating the explosive member for the booster with a primer part; And
And exploding the hardening explosive member by the explosive explosive member for detonation to cure a metal material.
The method according to claim 10,
Positioning the curing explosive member is characterized in that the explosion-curing member characterized in that covering the entire surface of the metal material with a plate-shaped curing explosive member.
The method according to claim 10,
The curing explosive member is a plate-shaped explosive containing at least one molecular explosive of 60 wt% ~ 70wt% of PETN, RDX, TNT, HMX,
The explosive member for the booster is an explosion-curing method, characterized in that the explosive-type explosive containing at least one molecular explosive 60wt% ~ 77wt% of PETN, RDX, TNT, HMX.
The method according to claim 10,
The explosive member for the booster explosive cure method characterized in that the explosive power is greater than the explosive member for curing by containing a content of 1 to 10% more than the amount of molecular explosive contained in the curing explosive member.
The method according to claim 10,
The curing explosive member is a plate-shaped explosive having a thickness of 1mm ~ 5mm, the booster explosive member has a thickness in the range of 0.3 ~ 1 times the thickness of the curing explosives.
The method according to claim 10,
The step of stacking the booster explosive member is such that the booster explosive member is overlapped with a length of 10 to 50mm on the curing explosive member, and has a length protruding with a length of 50 to 80mm toward one side of the curing explosive member. Explosion hardening method characterized by laminating.
The method according to claim 15,
The metal material is high manganese steel containing 11.5wt% to 16.5wt of manganese,
The laminating step of the explosive member for the booster is explosion explosion curing method characterized in that the higher the manganese content of the metal material to prolong the length of the protruding to one side of the curing explosive member for laminating the booster explosive member.
The method according to claim 10,
The step of detonating the booster explosive member for the primer part is located at one end of the booster explosive member after placing the primer on the upper end side of the booster explosive member extending to protrude toward one side of the curing explosive member. Explosion hardening method characterized by detonating a side.

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