Rock hammer and method of forming same

Abstract

The application relates to a rock hammer and a forming method thereof. The rock hammer comprises an inner core and an outer shell. The inner core comprises a first surface along the outer periphery thereof. The outer shell is arranged outside the inner core and surrounds the first surface. The outer shell comprises a second surface facing the inner core, and the second surface is connected to the first surface. The connecting force between the second surface and the first surface is smaller than the connecting force of the internal structure of the inner core, and the connecting force between the second surface and the first surface is smaller than the connecting force of the internal structure of the outer shell. The rock hammer and the forming method thereof provided by the application have good strength.

Description

Technical Field

[0001] This application relates to the field of rock drilling equipment technology, and in particular to a rock drilling hammer and its forming method. Background Technology

[0002] In marine engineering, rock drills are used to break underwater rock layers. The collision between the rock drill and the underwater rock layer breaks the rock layer, thereby achieving the purpose of removing the rock layer and facilitating related construction operations.

[0003] During the collision between the rock drill and the underwater rock strata, the rock drill also bears enormous impact energy. The strength of the rock drill directly affects the efficiency of breaking the underwater rock strata and the lifespan of the rock drill itself. Summary of the Invention

[0004] The rock drilling hammer and its forming method provided in this application have good strength.

[0005] In a first aspect, embodiments of this application provide a rock drilling hammer, comprising: The core component includes a first surface along its outer periphery; An outer casing is disposed around the outside of the core component, the outer casing including a second surface facing the core component, the second surface being interconnected with the first surface; Wherein, the connection force between the second surface and the first surface is less than the connection force of the internal structure in the core component, and the connection force between the second surface and the first surface is less than the connection force of the internal structure in the outer shell component.

[0006] In some embodiments, the housing further includes a third surface facing away from the core, the third surface having the same shape as the first surface.

[0007] In some embodiments, the kernel extends along a first direction, and the kernel includes a first sub-part and a second sub-part connected to each other along the first direction; The second sub-part has a larger dimension in the second direction than the first sub-part in the second direction, and the second direction intersects with the first direction.

[0008] In some embodiments, the second sub-part includes a first sub-segment connected to the first sub-part and a second sub-segment connected to the first sub-segment and moving away from the first sub-part; Along the direction away from the first sub-part, the size of the first sub-segment gradually increases in the second direction, and the size of the second sub-segment gradually decreases in the second direction; The first surface includes a first sub-surface located in the first sub-segment and a second sub-surface located in the second sub-segment, wherein the curvature of the first sub-surface is less than the curvature of the second sub-surface.

[0009] In some embodiments, the housing includes a third sub-part and a fourth sub-part connected to each other along the first direction, the third sub-part being disposed on the outer peripheral side of the first sub-part, and the fourth sub-part being disposed on the outer peripheral side of the second sub-part; The dimension of the fourth sub-part in the second direction is greater than the dimension of the third sub-part in the second direction.

[0010] In some embodiments, the core component and the outer casing component are made of the same material.

[0011] In some embodiments, the ratio of the weight of the core component to the sum of the weights of the core component and the outer casing component is B1, where 0.25 ≤ B1 ≤ 0.4.

[0012] Secondly, embodiments of this application provide a method for forming a rock drilling hammer, including: Forming kernel components; The core component is cooled; An outer shell is formed by pouring molten steel around the inner core, which completely encloses the inner core. The temperature of the inner core is lower than that of the molten steel, and the molten steel gradually cools and solidifies from the inside out to form the outer shell.

[0013] In some embodiments, in the formation of the core component and the formation of the outer shell component, the core component and the outer shell component comprise the same material.

[0014] In some embodiments, in the formation of the core component, the core component includes a first sub-part and a second sub-part connected to each other along a first direction, the second sub-part having a larger dimension in a second direction than the first sub-part having a larger dimension in a second direction, and the second direction intersecting the first direction; In the formation of the outer shell, the outer contour of the outer shell is the same as the outer contour of the inner core.

[0015] According to the rock drill hammer and its forming method provided in this application, the rock drill hammer comprises a core component and an outer shell component, which are prepared separately through two casting processes. The core component is formed first, and after forming, it includes a first surface along its outer periphery. Subsequently, the outer shell component is formed, surrounding the core component around the first surface. The outer shell component includes a second surface facing the core component, and the second surface is connected to the first surface. During the forming process of the core component, the internal structure of the core component has a certain connecting force. During the forming process of the outer shell component, the internal structure of the outer shell component also has a certain connecting force. The second surface is connected to the first surface, and the connecting force between the second surface and the first surface is less than the connecting force of the internal structure in the core component, and the connecting force between the second surface and the first surface is less than the connecting force of the internal structure in the outer shell component. During the casting process of the core component, due to its relatively small volume compared to a large volume, shrinkage cavities are less likely to form inside the core component during cooling and solidification, resulting in a denser internal structure and increased connecting force within the core component. Under a predetermined volume, the density of the core component increases, and its strength also increases. After the core component is formed, it is cooled to a certain temperature. The core component itself can act as a cold source for the cooling and solidification of the outer shell component. During the fabrication of the outer shell component, it surrounds the outer periphery of the core component. During the cooling process of the outer shell component, the core component is located inside the outer shell component and acts as an internal cold source, enabling the outer shell component to gradually cool and solidify from the inside out. This ensures a certain order in the cooling of the outer shell component, thereby reducing the probability of shrinkage cavities and making the internal structure of the outer shell component more compact. The cohesive force of the internal structure within the outer shell component is increased, resulting in increased density and strength within a predetermined volume. The combined design of the core and outer shell components ensures a compact internal structure for the entire rock drill hammer, thereby increasing the density and, consequently, the strength of the rock drill hammer. Attached Figure Description

[0016] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0017] Figure 1 This application provides a schematic diagram of the structure of a rock drilling hammer according to some embodiments; Figure 2 This is a schematic diagram of the core component in a rock drill hammer, provided for some embodiments of this application.

[0018] Marker explanation: 10. Kernel component; 11. First sub-section; 12. Second sub-section; 121. First segment; 122. Second segment; 20. Outer casing; 21. Third sub-section; 22. Fourth sub-section; M1, first surface; M11, first sub-surface; M12, second sub-surface; M2, the second surface; M3, the third surface; X, the first direction; Y, the second direction.

[0019] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0020] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] During the collision between a rock drill and underwater rock strata, the drill also experiences tremendous impact energy. The strength of the rock drill directly affects its efficiency in breaking underwater rock strata and its own lifespan. If the rock drill is not strong enough, it may break during the impact with the underwater rock strata.

[0023] In view of this, firstly, please refer to Figure 1 and Figure 2This application provides a rock drilling hammer, including a core component 10 and a housing component 20. The core component 10 includes a first surface M1 along its outer periphery. The housing component 20 surrounds the first surface M1 and is disposed outside the core component 10. The housing component 20 includes a second surface M2 facing the core component 10, and the second surface M2 is connected to the first surface M1. The connection force between the second surface M2 and the first surface M1 is less than the connection force of the internal structure of the core component 10, and the connection force between the second surface M2 and the first surface M1 is less than the connection force of the internal structure of the housing component 20.

[0024] The rock drill hammer provided in this application is used in marine engineering for breaking underwater rock formations. During operation, the rock drill hammer is first lifted to a certain height by an external structure, giving it potential energy relative to the underwater rock formation. Then, the rock drill hammer is released, and under its own weight, it overcomes buoyancy and falls, converting the potential energy accumulated at that height into kinetic energy. When the rock drill hammer comes into contact with the underwater rock formation, the two collide, thus breaking the underwater rock.

[0025] When a rock drill hammer impacts underwater rock formations, it is necessary to ensure that the rock drill hammer has high strength. The rock drill hammer provided in this application embodiment includes a core component 10 and an outer casing 20. The outer casing 20 surrounds the core component 10 and is interconnected with it. By setting the rock drill hammer in the form of the outer casing 20 surrounding the core component 10, both the core component 10 and the outer casing 20 can have relatively high strength, so as to facilitate impact on underwater rock formations.

[0026] Rock drill hammers are manufactured using a casting process. During casting, the raw material for the hammer is cooled and solidified from a liquid state. In related technologies, the cooling and solidification of the raw material for rock drill hammers occurs externally within the pre-set volume of the hammer. This means cooling proceeds from the outside in during hammer formation. Due to the large volume of the rock drill hammer, if different locations within the hammer solidify at different rates, shrinkage cavities will form inside, affecting its strength. After casting, although the volume of the rock drill hammer remains within the pre-set mold volume, the presence of shrinkage cavities reduces its density, consequently decreasing its strength. During impact with underwater rock formations, the locations of these shrinkage cavities are weak points, making the hammer prone to breakage.

[0027] In this embodiment, the original one-piece structure of the rock drill hammer is changed to include a core component 10 and an outer casing 20. The core component 10 and the outer casing 20 are manufactured separately through two casting processes. During the casting process of the core component 10, the internal structure of the core component 10 cools and solidifies. Due to the relatively small volume of the core component 10 compared to a large volume, shrinkage cavities are less likely to form inside the core component 10 during the cooling and solidification process. The internal structure of the core component 10 is compact, and the connecting force of the internal structure in the core component 10 is increased. Under a preset volume, the density of the core component 10 increases, and its strength also increases.

[0028] After the core component 10 is formed, it is cooled to a certain temperature, and the core component 10 itself can be used as a cold source. During the fabrication of the outer shell component 20, the outer shell component 20 surrounds the outer periphery of the core component 10. During the cooling process of the outer shell component 20, the core component 10 is inside the outer shell component 20 and acts as an internal cold source, enabling the outer shell component 20 to gradually cool and solidify from the inside out. This allows the cooling of the outer shell component 20 to have a certain order, thereby reducing the probability of shrinkage cavities in the outer shell component 20, making the internal structure of the outer shell component 20 compact, and increasing the connecting force of the internal structure of the outer shell component 20. Under a preset volume, the density of the outer shell component 20 increases, and its strength also increases. The combined arrangement of the core component 10 and the outer shell component 20 makes the internal structure of the entire rock drill hammer compact, thereby increasing the density of the rock drill hammer and thus increasing its strength.

[0029] During the forming process of the rock drill hammer, the core component 10 is formed first, and the core component 10 includes a first surface M1 along its outer periphery. Subsequently, the outer shell component 20 is formed, surrounding the first surface M1 and disposed outside the core component 10. The outer shell component 20 includes a second surface M2 facing the core component 10, and the second surface M2 is connected to the first surface M1. During the forming process of the core component 10, the internal structure of the core component 10 has a certain connecting force. During the forming process of the outer shell component 20, the internal structure of the outer shell component 20 also has a certain connecting force. The second surface M2 is connected to the first surface M1, and the connecting force between the second surface M2 and the first surface M1 is less than the connecting force of the internal structure of the core component 10. Similarly, the connecting force between the second surface M2 and the first surface M1 is less than the connecting force of the internal structure of the outer shell component 20.

[0030] When the rock drill collides with underwater rock strata, the outer shell 20 contacts the underwater rock strata. The force exerted by the underwater rock strata on the outer shell 20 compresses the inner shell 10, ensuring a tight connection between the second surface M2 and the first surface M1. This reduces the impact of the relatively weak connection force between the second surface M2 and the first surface M1. Simultaneously, during the molding process of the outer shell 20, the inner shell 10 acts as an internal cold source. The liquid material of the outer shell 20, upon contact with the first surface M1, exhibits relatively good bonding strength. Both the outer shell 20 and the inner shell 10 have high internal density, resulting in a high-density rock drill and thus increasing its strength.

[0031] In summary, in this embodiment, the rock drill hammer comprises a core component 10 and an outer casing 20, which are manufactured separately through two casting processes. The core component 10 is formed first, and after forming, it includes a first surface M1 along its outer periphery. Subsequently, the outer casing 20 is formed, surrounding the first surface M1 and disposed outside the core component 10. The outer casing 20 includes a second surface M2 facing the core component 10, and the second surface M2 is connected to the first surface M1. During the forming process of the core component 10, the internal structure of the core component 10 has a certain connecting force. During the forming process of the outer casing 20, the internal structure of the outer casing 20 also has a certain connecting force. The second surface M2 is connected to the first surface M1, and the connecting force between the second surface M2 and the first surface M1 is less than the connecting force of the internal structure of the core component 10. Similarly, the connecting force between the second surface M2 and the first surface M1 is less than the connecting force of the internal structure of the outer casing 20. During the casting process of the core component 10, due to its relatively small volume compared to a larger volume, shrinkage cavities are less likely to form inside the core component 10 during cooling and solidification. This results in a compact internal structure and increased cohesive forces within the core component 10. Within a predetermined volume, the density and strength of the core component 10 increase. After the core component 10 is formed, it is cooled to a certain temperature, and the core component 10 itself can serve as a cold source for the cooling and solidification of the outer shell component 20. During the fabrication of the outer shell component 20, the outer shell component 20 surrounds the outer periphery of the core component 10. During the cooling process of the outer shell component 20, the core component 10, located inside the outer shell component 20 and acting as an internal cold source, allows the outer shell component 20 to gradually cool and solidify from the inside out. This sequential cooling reduces the probability of shrinkage cavities within the outer shell component 20, resulting in a compact internal structure, increased cohesive forces within the outer shell component 20, and increased density and strength within a predetermined volume. The integrated design of the core component 10 and the outer casing 20 enables the internal structure of the rock drill to be compact, thereby increasing the density of the rock drill and thus improving its strength.

[0032] In some embodiments, the housing 20 further includes a third surface M3 facing away from the core 10, the third surface M3 having the same shape as the first surface M1.

[0033] During the casting process of the outer shell 20, molten steel is wrapped around the outer core 10. Since the temperature of the core 10 is much lower than that of the outer steel, the core 10, acting as an internal cold source, rapidly absorbs heat from the surrounding molten steel. This causes the outer shell 20 to cool and solidify first from the surface of the core 10, and then gradually move outwards. During this solidification process, to ensure relatively stable and uniform cooling and solidification of the outer shell 20 at different locations, the outer shell 20 also includes a third surface M3 facing away from the core 10. The third surface M3 has the same shape as the first surface M1, so that the core 10 can have a relatively uniform heat absorption rate at different locations, allowing the outer shell 20 to advance layer by layer from the inside out.

[0034] It is understandable that the shape of the first surface M1 in the core component 10 is the same as the shape of the outer surface of the rock drill hammer, that is, the third surface M3, so that the outer casing 20 can form a cooling sequence from the inside to the outside at different positions, thereby reducing the cooling trend of the outer casing 20 from the edge to the inside or from one side to the other, reducing the occurrence of two or more cooling trends inside the outer casing 20, thereby reducing the probability of shrinkage cavities inside the outer casing 20, ensuring the compactness of the internal structure of the outer casing 20, and ensuring the strength of the outer casing 20.

[0035] In some embodiments, the core component 10 extends along a first direction X, and the core component 10 includes a first sub-part 11 and a second sub-part 12 connected to each other along the first direction X; the second sub-part 12 has a larger dimension in the second direction Y than the first sub-part 11 in the second direction Y, and the second direction Y intersects the first direction X.

[0036] During operation, the rock drill hammer is lifted to a certain height and then falls naturally. In order to adjust the falling posture of the rock drill hammer and control the impact position of the rock drill hammer with the underwater rock layer, a specific setting is made for the shape of the outer surface of the rock drill hammer. Since the shape of the outer surface of the rock drill hammer, that is, the shape of the third surface M3, is the same as the shape of the first surface M1, the shape of the first surface M1 is the outer surface of the core component 10, and the shape of the first surface M1 is determined by the solid structure of the core component 10.

[0037] The core component 10 extends along a first direction X, which can be either its length or its axial direction. Along the first direction X, the core component 10 includes a first sub-part 11 and a second sub-part 12 connected to each other. The first sub-part 11 and the second sub-part 12 correspond to different positions on the core component 10 along the first direction X. The dimension of the second sub-part 12 in the second direction Y is larger than the dimension of the first sub-part 11 in the second direction Y, and the second direction Y intersects with the first direction X. The second direction Y can be either the width direction or the radial direction of the core component 10.

[0038] Taking the core component 10 as a columnar structure as an example, the core component 10 includes a first sub-part 11 and a second sub-part 12 along its axial direction. The radial dimension of the first sub-part 11 is smaller, and the radial dimension of the second sub-part 12 is larger. The first sub-part 11 forms the thinner end of the core component 10, and the second sub-part 12 forms the thicker end of the core component 10, so that the center of gravity of the core component 10 is located closer to the second sub-part 12 along the first direction X. After the outer shell 20 is formed, based on the setting that the third surface M3 has the same shape as the first surface M1, the overall center of gravity of the rock drill hammer is located relatively biased towards the second sub-part 12 and away from the first sub-part 11 along the first direction X. This offset setting of the center of gravity of the rock drill hammer means that when the rock drill hammer impacts the underwater rock layer, its impact position is the surface closer to the center of gravity. Thus, the impact position of the rock drill hammer with the underwater rock layer is pre-controlled in the structure, so that the subsequent reinforcement at the impact position can be arranged to ensure the strength of the rock drill hammer.

[0039] In some embodiments, the second sub-part 12 includes a first sub-segment 121 connected to the first sub-part 11 and a second sub-segment 122 connected to the first sub-segment 121 and moving away from the first sub-part 11. Along a direction away from the first sub-part 11, the size of the first sub-segment 121 gradually increases in the second direction Y, and the size of the second sub-segment 122 gradually decreases in the second direction Y. The first surface M1 includes a first sub-surface M11 located on the first sub-segment 121 and a second sub-surface M12 located on the second sub-segment 122, wherein the curvature of the first sub-surface M11 is less than the curvature of the second sub-surface M12.

[0040] Since rock drills are used for underwater operations, they will be subject to buoyancy during their fall. To reduce the obstruction of the rock drill's fall by underwater buoyancy and to stabilize its falling posture using underwater buoyancy, the shape of the rock drill's outer surface is further designed.

[0041] During the descent of the rock drill hammer, the second sub-section 12 faces downwards. Due to its larger radial dimension, the outer surface of the second sub-section 12 is rounded to facilitate the diversion of surrounding water flow to both sides. The second sub-section 12 includes a first segment 121 connected to the first sub-section 11 and a second segment 122 connected to the first segment 121 and facing away from the first sub-section 11. Along the direction away from the first sub-section 11, the dimension of the first segment 121 gradually increases in the second direction Y, while the dimension of the second segment 122 gradually decreases in the second direction Y. Through the dimensional changes of the first segment 121 and the second segment 122, the center of gravity of the core component 10 can be further offset, thereby offsetting the center of gravity of the rock drill hammer.

[0042] The first surface M1 includes a first sub-surface M11 located around the first sub-segment 121 and a second sub-surface M12 located around the second sub-segment 122. Both the first sub-surface M11 and the second sub-surface M12 are smoothly curved surfaces. The second sub-surface M12 is located around the second sub-segment 122, and its curvature is set to be relatively large. The first sub-surface M11 is located around the first sub-segment 121, and its curvature is set to be relatively small. The first sub-surface M11 and the second sub-surface M12 can form a teardrop-shaped structure on the outer surface of the core component 10. Since the third surface M3 has the same shape as the first surface M1, the third surface M3 can also form a teardrop-shaped structure. That is to say, the outer surface of the rock drill includes a teardrop-shaped curved surface portion to reduce the obstruction of underwater buoyancy on the rock drill's fall, and the curvature change of the teardrop-shaped curved surface portion stabilizes the rock drill's falling posture through underwater buoyancy.

[0043] In some embodiments, the housing member 20 includes a third sub-part 21 and a fourth sub-part 22 interconnected along a first direction X. The third sub-part 21 is disposed on the outer peripheral side of the first sub-part 11, and the fourth sub-part 22 is disposed on the outer peripheral side of the second sub-part 12. The dimension of the fourth sub-part 22 in the second direction Y is larger than the dimension of the third sub-part 21 in the second direction Y.

[0044] Based on the core component 10 including a first sub-part 11 and a second sub-part 12 interconnected along the first direction X, the core component 10 is formed with a larger dimension at one end and a smaller dimension at the other end along the first direction X. The outer casing 20 surrounds the core component 10, and based on the fact that the third surface M3 and the first surface M1 have the same configuration, the rock hammer is also formed with a larger dimension at one end and a smaller dimension at the other end along the first direction X.

[0045] To improve the molding quality of the outer shell 20, in this embodiment, the third surface M3 is not proportionally enlarged or reduced from the first surface M1. When the relationship between the third surface M3 and the first surface M1 is proportionally enlarged or reduced, the distance between the first surface M1 and the third surface M3 is equal at different positions on the rock drill hammer. That is, the thickness of the outer shell 20 is uniformly set at different positions. Without considering the process error of two castings, the center of gravity of the core component 10 is basically coincident with the center of gravity of the rock drill hammer. In the above arrangement, since the radial dimension of the core component 10 is different at different positions, its heat absorption capacity is also different at different positions after the core component 10 cools. At positions with larger radial dimensions, the heat absorption capacity is stronger; at positions with smaller radial dimensions, the heat absorption capacity is weaker. When the thickness of the outer casing 20 is uniformly set at different locations, during the cooling and solidification process of the outer casing 20, there is initially a cooling sequence from the inside out. However, since different parts of the core component 10 have different heat absorption capacities, after a period of time, a cooling trend will emerge within the outer casing 20 from areas with larger radial dimensions towards areas with smaller radial dimensions. In other words, two cooling sequences will occur within the outer casing 20, increasing the probability of shrinkage cavities and affecting the tightness of the internal structure, thereby impacting the strength of the outer casing 20.

[0046] To reduce the probability of two cooling sequence trends occurring inside the outer casing 20, the center of gravity of the outer casing 20 is offset from the center of gravity of the core component 10. The outer casing 20 includes a third sub-part 21 and a fourth sub-part 22 interconnected along a first direction X. The third sub-part 21 is disposed on the outer periphery of the first sub-part 11, and the fourth sub-part 22 is disposed on the outer periphery of the second sub-part 12. Based on the fact that the dimension of the second sub-part 12 in the second direction Y is larger than the dimension of the first sub-part 11 in the second direction Y, the dimension of the fourth sub-part 22 in the second direction Y is set to be larger than the dimension of the third sub-part 21 in the second direction Y, resulting in a non-uniform thickness configuration for the outer casing 20. The thicker portions of the outer casing 20 correspond to the thicker portions of the core component 10, and the thinner portions of the outer casing 20 correspond to the thinner portions of the core component 10. In other words, the parts of the outer shell 20 that need to absorb more heat are matched with the parts of the core 10 that have a strong heat absorption capacity, and the parts of the outer shell 20 that need to absorb less heat are matched with the parts of the core 10 that have a weak heat absorption capacity. This reduces the tendency for two cooling sequences to occur inside the outer shell 20, thereby reducing the probability of shrinkage cavities in the outer shell 20, improving the tightness of the internal structure of the outer shell 20, and thus improving the strength of the outer shell 20.

[0047] In some embodiments, the core component 10 and the outer casing component 20 are made of the same material.

[0048] In order to increase the connection strength between the core component 10 and the outer casing 20 and improve the strength of the rock drill, the core component 10 and the outer casing 20 are made of the same material to increase the good connection force between the first surface M1 and the second surface M2.

[0049] Specifically, considering both cost and strength, both the core component 10 and the outer shell component 20 are made of carbon steel. After the core component 10 is used as an internal cold source to assist in the molding of the outer shell component 20, the density of the carbon steel outer shell component 20 is greater than 7.8 g / cm³. 3 This gives the outer casing 20 good strength.

[0050] In some embodiments, the ratio of the weight of the core component 10 to the sum of the weights of the core component 10 and the outer casing 20 is B1, where 0.25 ≤ B1 ≤ 0.4.

[0051] To ensure the strength of the rock drill hammer, the ratio between the core component 10 and the outer shell component 20 needs to be properly set. The ratio of the weight of the core component 10 to the sum of the weights of the core component 10 and the outer shell component 20 should be controlled between 0.25 and 0.4. This allows the core component 10 to be kept in a relatively small volume, reducing the probability of shrinkage cavities occurring inside the core component 10 during the molding process. At the same time, adjusting the ratio between the core component 10 and the outer shell component 20 ensures the cooling effect of the core component 10 on the outer shell component 20, further reducing the probability of shrinkage cavities occurring inside the outer shell component 20 during the molding process. Combining the internal structural compactness of the core component 10 and the outer shell component 20 improves the strength of the rock drill hammer.

[0052] Secondly, such as Figure 1 and Figure 2 As shown in the figure, this application provides a method for forming a rock drilling hammer, including: S10, forming kernel component 10; S20. Cool the core component 10; S30. Form the outer shell 20 by pouring molten steel around the inner core 10. The molten steel completely encloses the inner core 10. The temperature of the inner core 10 is lower than that of the molten steel. The molten steel gradually cools and solidifies from the inside out to form the outer shell 20.

[0053] In step S10, forming the core component 10, the core component 10 is formed by a casting process. The material of the core component 10 is the same as that of the rock drill hammer to be manufactured, and the ratio of the weight of the core component 10 to the weight of the rock drill hammer to be manufactured is controlled between 0.25 and 0.4 to keep the core component 10 in a relatively small volume, thereby reducing the probability of shrinkage cavities occurring inside the core component 10 during the forming process. For example, the material of the core component 10 includes carbon steel.

[0054] In S20, the core component 10 is cooled to sufficiently reduce its temperature so that it can subsequently act as an internal cold source to cool and solidify the outer casing 20. Specifically, the core component 10 can be sufficiently air-cooled to bring its temperature to room temperature.

[0055] In step S30, forming the outer shell 20, the inner core 10 is pre-fixed in the mold cavity. Then, molten steel is poured around the inner core 10. During pouring, the temperature and speed must be carefully controlled to ensure the molten steel fills the mold smoothly and completely encloses the inner core 10. Since the temperature of the inner core 10 is much lower than that of the outer molten steel, the inner core 10, acting as an internal cold source, will rapidly absorb heat from the surrounding molten steel. This causes the outer shell 20 to cool and solidify first from the surface of the inner core 10, and then gradually move towards the outer layer.

[0056] In some embodiments, S30, forming the outer shell 20, further includes: S40, cooling the outer shell 20 and the core component 10. During the cooling process, when the outer shell 20 and the core component 10 are cooled to between 850°C and 950°C in the mold cavity, the mold is opened in advance, and the outer shell 20 and the core component 10 are taken out and placed in the air to cool. Taking advantage of the faster cooling characteristic of air, the surface structure of the outer shell 20 is further refined, and the hardness and strength of the surface of the outer shell 20 are improved.

[0057] In some embodiments, in forming the core component 10 and the outer casing 20, the core component 10 and the outer casing 20 are made of the same material.

[0058] To increase the connection strength between the core component 10 and the outer casing 20, and thus improve the strength of the rock drill hammer, both the core component 10 and the outer casing 20 are made of the same material to enhance the bonding force between the first surface M1 and the second surface M2. Specifically, considering both cost and strength, both the core component 10 and the outer casing 20 are made of carbon steel. After the core component 10 is used as an internal cold source to assist in the molding of the outer casing 20, the density of the carbon steel outer casing 20 is greater than 7.8 g / cm³. 3 This gives the outer casing 20 good strength.

[0059] In some embodiments, in forming the core member 10, the core member 10 includes a first sub-part 11 and a second sub-part 12 connected to each other along a first direction X. The second sub-part 12 has a larger dimension in a second direction Y than the first sub-part 11 in the second direction Y, and the second direction Y intersects the first direction X. In forming the outer shell member 20, the outer contour of the outer shell member 20 is the same as the outer contour of the core member 10.

[0060] During the casting process, the shape of the mold cavity determines the shape of the outer surface of the rock drill hammer, that is, the shape of the third surface M3. In S10, when forming the core member 10, the outer contour of the core member 10 is the same as the shape of the mold cavity, so as to be the same as the outer contour of the outer shell member 20, and thus the same as the shape of the outer surface of the rock drill hammer. In order to adjust the falling posture of the rock drill hammer and control the impact position of the rock drill hammer with the underwater rock layer, the core member 10 extends along the first direction X. The first direction X can be the length direction or the axial direction of the core member 10. The core member 10 includes a first sub-part 11 and a second sub-part 12 connected to each other along the first direction X. The first sub-part 11 and the second sub-part 12 correspond to different positions of the core member 10 along the first direction X. The dimension of the second sub-part 12 in the second direction Y is larger than the dimension of the first sub-part 11 in the second direction Y. The second direction Y intersects the first direction X. The second direction Y can be the width direction or the radial direction of the core member 10. The shape of the core member 10 is set, and the shape of the mold cavity is also set accordingly. After forming the core component 10 in S10, the surface of the core component 10 can be cleaned to reduce the probability of rust and oil on the surface of the core component 10, so as to ensure the connection between the subsequent outer casing 20 and the core component 10.

[0061] Taking the fabrication of a 3-ton rock drill hammer as an example, firstly, molten steel of the same material as the rock drill hammer is used to cast a core component 10 weighing approximately 1 ton. The outer contour of the core component 10 is the same as the shape of the mold cavity. Then, the surface of the core component 10 is cleaned to ensure its cleanliness. Subsequently, the core component 10 is cooled.

[0062] The core component 10 is pre-fixed in the mold cavity, and approximately 2 tons of molten steel are melted. Molten steel is then poured around the core component 10, with the pouring temperature controlled at around 1480℃, and poured smoothly into the mold to ensure the molten steel fills the mold evenly and completely encapsulates the core component 10. Since the temperature of the core component 10 is much lower than that of the outer layer of molten steel, the core component 10, acting as an internal cold source, rapidly absorbs heat from the surrounding molten steel. This causes the outer shell component 20 to cool and solidify first from the surface of the core component 10, gradually progressing outwards. The outer shell component 20 solidifies from the surface of the core component 10, and after approximately 30 minutes, the entire outer shell component 20 solidifies.

[0063] The outer casing 20 and the inner casing 10 are monitored using thermocouples. When the surface temperature of the outer casing 20 drops to approximately 850°C-950°C, the casing is opened in advance, and the outer casing 20 and the inner casing 10 are removed and placed in air to cool. Afterward, some post-processing operations can be performed, such as sand removal, cutting the gating system, and performing necessary "water toughening treatment" to obtain high toughness.

[0064] Testing revealed that the casting process of this rock drill hammer achieved a yield rate of 96%, and the internal quality met the Class II standard in ultrasonic flaw detection. The tensile strength of the rock drill hammer sample was ≥800MPa, and the impact toughness (Akv) was ≥120J. All performance indicators were excellent. Furthermore, this rock drill hammer performed exceptionally well in hard rock construction, and its service life was greatly extended.

[0065] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rock drilling hammer, characterized in that, include: The core component includes a first surface along its outer periphery; An outer casing is disposed around the outside of the core component, the outer casing including a second surface facing the core component, the second surface being interconnected with the first surface; Wherein, the connection force between the second surface and the first surface is less than the connection force of the internal structure in the core component, and the connection force between the second surface and the first surface is less than the connection force of the internal structure in the outer shell component.

2. The rock drilling hammer according to claim 1, characterized in that, The outer casing also includes a third surface facing away from the inner casing, the third surface having the same shape as the first surface.

3. The rock drilling hammer according to claim 1, characterized in that, The core component extends along a first direction, and the core component includes a first sub-part and a second sub-part connected to each other along the first direction; The second sub-part has a larger dimension in the second direction than the first sub-part in the second direction, and the second direction intersects with the first direction.

4. The rock drilling hammer according to claim 3, characterized in that, The second sub-part includes a first sub-segment connected to the first sub-part and a second sub-segment connected to the first sub-segment and moving away from the first sub-part; Along the direction away from the first sub-part, the size of the first sub-segment gradually increases in the second direction, and the size of the second sub-segment gradually decreases in the second direction; The first surface includes a first sub-surface located in the first sub-segment and a second sub-surface located in the second sub-segment, wherein the curvature of the first sub-surface is less than the curvature of the second sub-surface.

5. The rock drilling hammer according to claim 3, characterized in that, The outer casing includes a third sub-part and a fourth sub-part connected to each other along the first direction. The third sub-part is disposed on the outer peripheral side of the first sub-part, and the fourth sub-part is disposed on the outer peripheral side of the second sub-part. The dimension of the fourth sub-part in the second direction is greater than the dimension of the third sub-part in the second direction.

6. The rock drilling hammer according to claim 1, characterized in that, The core component and the outer casing component are made of the same material.

7. The rock drilling hammer according to claim 1, characterized in that, The ratio of the weight of the core component to the sum of the weights of the core component and the outer shell component is B1, where 0.25 ≤ B1 ≤ 0.

4.

8. A method for forming a rock drilling hammer, characterized in that, include: Forming kernel components; The core component is cooled; An outer shell is formed by pouring molten steel around the inner core, which completely encloses the inner core. The temperature of the inner core is lower than that of the molten steel, and the molten steel gradually cools and solidifies from the inside out to form the outer shell.

9. The forming method of the rock drilling hammer according to claim 8, characterized in that, In the formation of the core component and the formation of the outer shell component, the core component and the outer shell component are made of the same material.

10. The forming method of the rock drilling hammer according to claim 8, characterized in that, In the formation of the core component, the core component includes a first sub-part and a second sub-part connected to each other along a first direction, the second sub-part having a larger dimension in a second direction than the first sub-part having a larger dimension in a second direction, and the second direction intersecting the first direction; In the formation of the outer shell, the outer contour of the outer shell is the same as the outer contour of the inner core.

Images