WO2023158054A1 - Carottier - Google Patents

Carottier Download PDF

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Publication number
WO2023158054A1
WO2023158054A1 PCT/KR2022/017081 KR2022017081W WO2023158054A1 WO 2023158054 A1 WO2023158054 A1 WO 2023158054A1 KR 2022017081 W KR2022017081 W KR 2022017081W WO 2023158054 A1 WO2023158054 A1 WO 2023158054A1
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WO
WIPO (PCT)
Prior art keywords
main body
cutting
core drill
outer diameter
cutting tip
Prior art date
Application number
PCT/KR2022/017081
Other languages
English (en)
Korean (ko)
Inventor
임형국
Original Assignee
임형국
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 임형국 filed Critical 임형국
Publication of WO2023158054A1 publication Critical patent/WO2023158054A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling

Definitions

  • the present invention relates to a core drill for forming a hole in a workpiece, and more specifically, to a core drill formed in a separable type having a structure that facilitates foreign matter discharge, improves drilling work efficiency, and reduces replacement cost of the core drill. it's about
  • the core drill 1 In general, core drilling is used to form holes in difficult-to-cut materials such as stone, reinforced concrete, asphalt, and metal.
  • the core drill 1 generally has a structure in which a rotating circular body 2 and a cutting tip 4, which is a diamond segment, are coupled to the body 2.
  • the main body 2 is connected to the drill through the drill mounting portion 3 and then the cutting tip 4 rubs against the workpiece through the rotational force transmitted therefrom to perform the drilling operation.
  • the conventional core drill (1) In the process of drilling reinforced concrete by the conventional core drill (1), if the cut concrete foreign matter, especially the cut reinforced foreign matter, is inserted into the main body (2), the rotation of the core drill (1) is hindered, making drilling impossible A problem occurs, and in this case, the drilling operation must be stopped and the reinforcing bar foreign matter inserted into the main body 2 must be removed, but the conventional core drill 1 structure has a problem in that it is very difficult to remove the reinforcing bar foreign matter.
  • the conventional core drill (1) has a straight plane on which the cutting tip (4) is attached to the main body (2), it is easily separated by cutting force or drilling resistance, and the cutting tip (4) needs to be replaced frequently, but the cutting tip ( 4) is integrally attached to the main body 2 and there is a problem in that the entire core drill 1 including the cutting tip 4 needs to be replaced.
  • the present invention is to solve the problems described above, and a technical problem is to provide a core drill in which a cover part is formed in a detachable type at one end of the main body in order to easily remove foreign substances from concrete or reinforcing bars inserted into the main body.
  • a technical problem of the present invention is to provide a core drill capable of reducing abrasion of the main body in the process of discharging foreign substances generated in the drilling process.
  • the present invention is to provide a core drill formed in a separable manner such that the cutting tip of the core drill does not easily separate from the main body due to cutting force, reduces the puncturing resistance to increase the puncturing efficiency, and the cutting tip and the main body are separable. as a technical challenge.
  • the present invention provides a core drill that saves replacement cost compared to replacing the entire core drill by replacing only the corresponding parts when the body, cover, and cutting tip of the core drill are damaged or worn. do.
  • the main body 10 formed in a hollow cylindrical shape
  • a cover portion 20 having a drill mounting portion 22 detachably attached to one end of the main body 10 and mounted to a drilling drill;
  • It includes a cutting part 30 detachably attached to the other end of the main body 10 and having a cutting tip 32 for cutting a workpiece,
  • a first screw part S1 is formed on one end of the main body 10 and the cover part 20,
  • a second screw part S2 is formed at the other end of the main body 10 and the cutting part 30,
  • the main body 10, the cover part 20 and the cutting part 30 are characterized in that they are detachable.
  • first screw portion (S1) and the second screw portion (S2) are square screws
  • the number of threads is 3 or less
  • the width of the first screw part (S1) and the second screw part (S2) is 4 to 8 mm
  • the depth of the first screw part (S1) (the depth of peaks and valleys) is the body 10 or the cover. It is 1/3 to 1/2 of the thickness of the part
  • the depth of the second screw part (S2) (the depth of the peak and valley) is 1/3 to 1/2 of the thickness of the body 10 or the body 31.
  • At least one or more first outlets 11 are formed at regular intervals on the outer circumferential surface of the main body 10 of the present invention.
  • At least one of them has an end extending to one end of the main body 10 so that the end of the first outlet 11 is open,
  • a second outlet 21 is formed in the cover part 20,
  • the cover part 20 is characterized in that the second outlet 21 is screwed to the main body 10 so that it is in communication with the first outlet 11.
  • the cutting part 30 of the present invention includes a body 31 having a screw thread 33 formed at the upper end of the body to be coupled with the main body 10, a cutting tip 32 attached to the lower end of the body to drill a workpiece, and a body (31) including a discharge hole 35 formed in the middle,
  • the outer diameter of the body 31 is formed larger than the outer diameter of the body 10,
  • the size of the step E formed by the difference in outer diameter of the body 31 and the body 10 is set in the range of 0.5 to 1.5 mm,
  • the ratio between the length L1 of the main body 10 and the length L2 of the cutting part 30 is set in the range of 3:1 to 20:1.
  • the uneven portion 12 is formed on the outer circumferential surface of the main body 10 of the present invention
  • a spiral groove 34 is formed on the outer circumferential surface of the body 31, and the cutting tip 32 attached to the lower end of the body 31 is also cut.
  • a tip groove 32-1 is formed, the cutting tip groove 32-1 is formed to communicate with the spiral groove 34 of the body 31, and the spiral groove 34 of the body 31 is formed to communicate with the body 10 It is characterized by being in communication with the concave-convex portion 12 of the.
  • the body 31 of the cutting part 30 of the present invention is formed to be divided into a lower end 31-1, a middle 31-2, and an upper end 31-3,
  • a first step E1 is formed so that the outer diameter of the lower end 31-1 to which the cutting tip 32 is attached protrudes the most
  • the second step E2 is formed so that the outer diameter of the middle 31-2 protrudes from the outer diameter of the upper end 31-3,
  • the outer diameter of the upper end 31-3 is configured to have the same outer diameter as the outer diameter of the main body 10,
  • the size of the first step E1 is larger than the size of the second step E2.
  • the body 31 of the cutting part 30 of the present invention is divided into an upper end 31-3, a middle 31-2, and a lower end 31-1, but the middle 31-2 has an upper end 31-3. 3) and a slope is formed to connect the lower end (31-1),
  • the outer diameter of the upper end 31-3 is set equal to the outer diameter of the main body 10,
  • the inclination of the inclined surface of the middle part 31-2 is determined by adjusting the lengths of the upper part 31-3 and the lower part 31-1,
  • the outer diameter of the lower end 31-1 is characterized in that a step E caused by a difference in outer diameter between the upper end 31-3 and the lower end 31-1 is formed to be 0.5 to 1.5 mm.
  • the attachment surface to which the body 31 and the cutting tip 32 are attached is characterized in that an inclined surface 37 or a sawtooth attachment surface 39 is formed to resist the cutting force.
  • the present invention provides the core drill 100 in which the main body 10 and the cover 20 are formed in a separable manner, so that concrete foreign substances or reinforcing bar foreign substances inserted into the main body can be easily removed.
  • the outer diameter of the cutting part 30 of the core drill 100 is larger than the outer diameter of the main body 10, so that it protrudes in a diametrical direction from the main body and is configured to smoothly discharge foreign substances, so that foreign substances generated during drilling are discharged from the main body ( 10) has the effect of reducing wear.
  • the present invention is a structure that increases the attachment area of the cutting tip attached to the cutting part 30 of the core drill, so that the cutting tip does not easily escape due to cutting force, and the thickness of the cutting tip is smaller than before, thereby reducing puncture resistance. There is an effect of increasing the perforation efficiency by reducing the.
  • the present invention has an effect of saving replacement cost compared to replacing the entire core drill by replacing only the corresponding part when the main body, cover part, or cutting part of the core drill is damaged or worn.
  • FIG. 1 is a configuration diagram of a conventional core drill 1.
  • FIG. 2 is an exploded configuration diagram of a core drill 100 according to an embodiment of the present invention.
  • FIG 3 is an assembly view of a core drill 100 according to an embodiment of the present invention and a view of a screw portion in which a cover portion and a cutting portion are screwed into a main body.
  • FIG 4 is a view showing the cover of the core drill 100 according to an embodiment of the present invention.
  • FIG. 5 is a view showing various modified examples of the cutting part of the core drill 100 of the present invention.
  • FIG. 6 is an enlarged view of a portion where a cutting tip is welded to a body of a core drill 100 according to an embodiment of the present invention.
  • FIG. 7 is a view illustrating an attachment surface between a body and a cutting tip according to an embodiment of the present invention.
  • FIG 8 is a view illustrating an attachment surface between a body and a cutting tip according to another embodiment of the present invention.
  • the core drill 100 may be used to drill a hole in a wall of a concrete building. Through this hole, various pipes such as air conditioner pipes can be installed.
  • the material or shape of the cutting tip 32 of the core drill 100 may vary depending on the material of the building wall.
  • FIG. 2 and 3 are exploded and cross-sectional views of the core drill 100 according to an embodiment of the present invention
  • FIG. 4 is a view showing the cover 20 of the core drill 100 according to an embodiment of the present invention. am.
  • the core drill 100 includes a body 10 formed in a hollow cylindrical shape, a cover having a drill mounting portion 22 detachably attached to one end of the body 10 and mounted on a drilling drill. It includes a part 20, and a cutting part 30 detachably attached to the other end of the main body 10 and having a cutting tip 32 for cutting a workpiece.
  • the main body 10 includes a first outlet 11, a concave-convex portion 12, a screw thread 15, and a screw thread 17.
  • a plurality of first outlets 11 are formed on the outer circumferential surface of the main body 10 through which foreign substances are discharged to the outside when the workpiece is drilled.
  • the first outlet 11 discharges foreign substances so that the drilling of the workpiece is more smoothly performed.
  • the first discharge port 11 is used to discharge foreign substances after the drilling is completed. That is, after the drilling is completed, the foreign matter may be discharged by applying force to the foreign matter through the first discharge port 11 in order to discharge the foreign matter contained in the main body 10 .
  • At least one, preferably four, first outlets 11 are formed on the outer circumferential surface of the main body 10 at regular intervals, and at least one of them has an end extending to one end of the main body 10 as shown in FIG.
  • An end of the first outlet 11 may have an open shape.
  • one end of the main body 10 has flexible elasticity in the radial direction, so the main body It is easy to discharge foreign substances caught inside, and there is an effect of significantly reducing blockage or rotation disturbance caused by foreign substances.
  • the first outlet 11 may be formed in an oblique direction as shown in FIG. 1 so that foreign substances are more smoothly discharged.
  • the shape of the first discharge port 11 may be formed in multiple shapes such as an oval shape, a straight shape, or an arc shape.
  • An uneven portion 12 is formed on the outer circumferential surface of the main body 10 .
  • the concave-convex portions 12 are formed in a spiral shape and are positioned at regular intervals along the outer circumference of the main body 10 .
  • the uneven part 12 moves to the outside along the trajectory of the uneven part 12 to facilitate the discharge of the foreign matter.
  • the concave-convex portion 12 may dissipate heat generated during a drilling operation.
  • the body 10 has a screw thread 15 formed at one end to which the cover 20 is mounted. Through the screw thread 15, it is coupled with the screw thread 25 of the cover part 20, which will be described later, so that the main body 10 and the cover part 20 can be detachably coupled.
  • the screw thread 15 formed at one end of the main body 10 and the screw thread 25 of the cover part 20 form the first screw part S1, and the screw thread 15 is a female screw,
  • the thread 25 is formed as a male thread.
  • the threads 15 and 25 of the first screw portion S1 are formed as square screws, and the screw threads 15 and 25 due to the inflow of foreign substances (concrete, aggregate, rebar scraps, etc.) flowing into the first screw portion S1 Damage can be prevented, and the load bearing capacity or rigidity of each screw thread can be increased.
  • the threads 15 and 25 of the first screw portion S1 are formed of square screws, so that the load that the threads 15 and 25 can handle is larger than the conventional triangular screw, so that the thickness of the main body 10 can be made thinner than before. The overall weight of the main body 10 can be reduced.
  • the thickness of the main body 10 should be about 3 mm to increase the size of the triangular screw itself, thereby increasing the rigidity of the triangular screw and facilitating processing of the triangular screw.
  • the stiffness of the threads increases even when the size of the threads themselves is reduced, so that the thickness of the main body 10 can be reduced to 1.5 mm, thereby reducing the overall weight of the main body. Since it can be slowed down, it has the effect of reducing the perforation cutting energy.
  • the number of threads 15 and 25 of the first screw part S1 is limited to 3 or less so that the main body and the cover part are fastened with 2 to 3 turns (2 to 3 pitches) or less.
  • the width is formed as narrow as 4 to 8 mm, preferably about 5 mm, and thus, the work time for screwing/separating the main body and the lid part is significantly reduced.
  • the depth of the first screw portion S1 including the screw threads 15 and 25 (the depth of the crest and valley) is set to about 1/3 to 1/2 of the thickness of the main body 10 or the lid.
  • the cover part 20 of the present invention has the same outer diameter as the main body 10, as shown in FIG. 2, and includes a second outlet 21, a drill mounting part 22, and a screw thread 25.
  • a plurality of second outlets 21 are formed in the cover part 20 .
  • (b) is a view showing the cover of the existing invention.
  • (c) is a view showing another embodiment of the cover part 30 of the present invention.
  • the cover part 20 has a plurality of second outlets 21 through which foreign substances are discharged to the outside when a workpiece is pierced are formed on the outer portion.
  • the second outlet 21 is formed to smoothly discharge foreign substances together with the first outlet 11 described above.
  • the cover part 20 is screwed to the main body 10 so that the second outlet 21 coincides with the first outlet 11 and communicates with it, so that foreign substances are removed from the second outlet communicating with the first outlet 11 when drilled.
  • discharge in the axial direction of the core drill 100 can be facilitated.
  • the shape of the second discharge port 21 may be formed in multiple shapes such as a square, circular, arc, straight, or triangular shape.
  • Figure 5 (b) shows the cover of the existing invention, the cover of the existing invention has a problem that the discharge port for discharging foreign substances is not formed, foreign substances are accumulated in the main body and cutting resistance increases during drilling.
  • the second outlet 21 may be formed in an elliptical perforated shape. Additionally, the second outlet 21 may be formed in various shapes, such as a circular shape, a polygonal shape, as well as an elliptical shape.
  • the center portion of the cover portion 20 includes a drill mounting portion 22 provided to connect the cover portion 20 to a drill.
  • the drilling drill is fastened to the drill mounting portion 22 by screwing.
  • a screw thread 25 is formed at a portion of the cover 20 coupled to the main body 10 .
  • the thread 25 may be coupled to the thread 15 of the body 10 to couple the body 10 and the cover portion 20.
  • the core drill 100 is separated from the main body 10 and the cover 20, it is easy to remove foreign substances inside the main body 10 after separating the cover 20.
  • the present invention stops the drilling operation and covers the cover 20 After separating the ) from the main body 10, foreign substances inserted into the main body 2 can be easily removed.
  • fastening holes 16 and 26 may be formed in the threads 15 and 25 formed in the body 10 and the cover 20 of the core drill 200, respectively. At this time, each of the fastening holes 16 and 26 may be formed in an area that does not overlap with the first outlet 11 . Each of the fastening holes 16 and 26 may fasten the body 10 and the cover 20 through the fastening member 40 .
  • the depth of the fastening hole 26 formed in the cover part 20 may be equal to or longer than the length of the fastening member 40 .
  • the depth of the fastening hole 26 is formed long, when the fastening member 40 is lost, even if the length is different, if the diameter is the same, another fastening member 40 is used to connect the main body 10 and the cover part 20 can be fixed.
  • the core drill is coupled so that the cutting part 30 is screwed to the other end of the main body 10 as shown in FIGS. 2 and 3.
  • the cutting part 30 of the present invention includes a body 31 having a screw thread 33 formed at the top of the body to be coupled with the body 10, a cutting tip 32 attached to the bottom of the body to drill a workpiece, and a body ( 31) includes a discharge hole 35 formed in the middle.
  • the discharge hole 35 has a function of discharging foreign substances during drilling and also has a function of inserting a tool for fastening and separating the cutting part 30 from the main body. Since the cutting part 30 can be easily rotated with a tool inserted into the discharge hole 35, the cutting part 30 and the main body 10 can be easily separated from each other.
  • the body 31 is provided with a screw thread 33 on the inner circumferential surface where the body 31 is screwed with the body 10, as shown in FIG. 3, and a screw thread 17 is formed on the outer circumferential surface of the other end of the body 10.
  • the screw thread 33 of the body 31 and the screw thread 17 of the body 10 form the second screw portion S2.
  • the threads 17 and 33 of the second screw portion S1 are formed as square screws, and the screw threads 17 and 33 due to the inflow of foreign substances (concrete, aggregate, rebar scraps, etc.) flowing into the first screw portion S1 Damage can be prevented, and the load bearing capacity or rigidity of each screw thread can be increased.
  • the number of threads 17 and 33 of the second screw part S2 is limited to 3 or less so that the main body and the cutting part are fastened with 2 to 3 turns (2 to 3 pitch) or less, so that the second screw part S2
  • the width (in the longitudinal direction of the core drill) is formed as narrow as 4 to 8 mm, preferably about 5 mm, so that the work time for screwing/separating the main body 10 and the cutting part 30 is significantly reduced. there is.
  • the width of the second screw portion S2 (in the longitudinal direction of the core drill) is narrowed to about 5 mm, the length of the body 31 can be manufactured as short as up to 50 mm or less, so that manufacturing costs can be reduced compared to the prior art.
  • the depth of the second screw portion S2 including the screw threads 17 and 33 (the depth of the crest and valley) is set to about 1/3 to 1/2 of the thickness of the body 10 or the body 31.
  • the screw thread 17 of the main body 10 is a male screw and the screw thread 33 of the body 31 is composed of a female screw, so that the screw thread 17 of the main body 10 is connected to the screw thread 33 of the body 31
  • the main body 10 is configured not to be exposed to the outside, so that an external impact is applied to the body exposed to the outside during the drilling operation, thereby preventing damage to the main body 10.
  • the present invention can easily adjust the length of the core drill 100 by connecting several main bodies 10 having the first and second screw parts S1 and S2 as described above.
  • the outer diameter (diameter) of the cutting portion 30 is formed larger than the outer diameter (diameter) of the main body 10 as shown in FIGS. 2 and 3 .
  • a step E is formed so that the outer diameter of the body 31 is larger than that of the main body 10, and the size of the step E is 0.5 to 1.5 mm, preferably 1 mm.
  • the outer diameter of the body 31 is formed so that it protrudes larger than the outer diameter of the main body 10, so that only the cutting part 30 is in contact with the workpiece during the drilling operation, and the contact area of the cutting part 30 with the workpiece is subject to cutting impact, etc.
  • a drilling hole the size of the outer diameter (diameter) of the cutting tip is formed in the workpiece. If (diameter) is the same as the outer diameter (diameter) of the cutting part or cutting tip, the outer circumferential surface of the main body 10 and the inner circumferential surface of the perforation hole come into contact with each other, resulting in increased abrasion or damage of the main body 10.
  • the diameter (outer diameter) of the main body 10 is smaller than the diameter (outer diameter) of the cutting part 30, only the body and/or the cutting tip of the cutting part 30 is in contact with the workpiece, and the cutting part 30
  • the main body 10 having a smaller diameter (outer diameter) than ) does not come into contact with the inner circumferential surface of the drilled hole, thereby preventing abrasion or damage of the outer circumferential surface of the main body 10, thereby significantly improving the service life of the main body 10.
  • the core drill can swing left and right around the axis of rotation (hereinafter referred to as “rotational motion”).
  • the part 30 is in contact with the workpiece and can sufficiently reduce the rotational fluctuation of the core drill, thereby preventing the main body 10 from contacting the inner diameter of the drilling hole of the workpiece, thereby preventing wear or damage of the main body 10. can prevent
  • the effect of the above-described cutting part 30 preventing rotational fluctuation of the core drill is determined by the length L1 of the main body 10 and the length L2 of the cutting part 30.
  • the rotational fluctuation of the core drill is caused by the center alignment error (roundness error or deviation) between the core drill and the core drill driving part and the eccentric force due to the cutting force of the cutting part (some component of the cutting force acts in the radial direction of the core drill, resulting in rotation deviation).
  • the eccentric force caused by the cutting force determines the rotational fluctuation, and this eccentric force is mainly generated in the cutting part 30, especially in the contact area between the cutting tip and the workpiece .
  • one end of the core drill 100 is fixed by the drill mounting portion 22, but the other end of the core drill, that is, the cutting portion 30, is a free end that is not fixed, so the main body 10 is damaged by the eccentric force acting on the free end. Rotational oscillation of is generated, and as the length L1 of the main body 10 increases, the rotational oscillation of the main body 10 increases due to the same eccentric force.
  • the ratio between the length L1 of the main body 10 and the length L2 of the cutting part 30 must be properly set, and the length L1 of the main body 10 As is increased, the length (L2) of the cutting portion 30 should also be increased.
  • the length L1 of the main body 10 is determined considering the depth, diameter, strength of the workpiece, and the like of the drilling hole.
  • the length L1 of the main body 10 is 90 mm and the length L2 of the cutting portion 30 is 15 mm.
  • a ratio of 6:1 is suitable.
  • the length L1 of the main body 10 is 500 mm and the length L2 of the cutting portion 30 is 30 mm.
  • the length L2 of the cutting portion 30 is preferably 16 to 17:1.
  • the ratio of the length L1 of the main body 10 and the length L2 of the cutting part 30 can be set in the range of 3: 1 to 20: 1 in consideration of the depth, diameter, strength of the workpiece, etc. of the drilling hole in the present invention. do.
  • the ratio of the length (L1) of the main body 10 and the length (L2) of the cutting part 30 is less than 3: 1, the effect of preventing rotational shaking is good, but the proportion of the length (L2) of the cutting part 30 is large in the core drill.
  • the effect of reducing the cost of the core drill is reduced, and when the ratio between the length L1 of the main body 10 and the length L2 of the cutting part 30 is greater than 20:1, the effect of preventing rotational vibration may be reduced.
  • FIG. 5 (a) shows that the body 31 of the cutting part 30 has a step E of the same size from the top to the bottom, and a spiral groove 34 is formed on the outer circumferential surface of the body 31 to prevent foreign substances from being discharged.
  • the cutting tip 32 attached to the lower end of the body 31 also has a cutting tip groove 32-1 to facilitate the discharge of foreign substances.
  • the cutting tip groove 32-1 of the cutting tip 32 is formed to communicate with the spiral groove 34 of the body 31, and the spiral groove 34 of the body 31 is the concave-convex portion of the body 10 ( 12), the cutting foreign matter generated from the cutting tip is easily discharged in the axial direction (longitudinal direction) of the core drill through the cutting tip groove 32-1, the spiral groove 34, and the uneven portion 12 It can be.
  • the cutting tip 32 may be attached so as not to protrude beyond the outer diameter of the body 31 or to protrude.
  • the cutting tip 32 protrudes beyond the outer diameter of the body 31, a space is formed between the cutting tip and the body, so that the cutting foreign matter of the cutting tip 32 is easily discharged into the space.
  • the body 10 may have a thickness of 1.5 mm, the body 31 may have a thickness of 2.5 mm, and the cutting tip 32 may have a thickness of 3.2 mm.
  • 5(b) shows the first step so that the body 31 of the cutting part 30 is divided into three stages from the top to the bottom so that the outer diameter of the lower end 31-1 to which the cutting tip 32 is attached protrudes the largest.
  • (E1) is formed, and a second step E2 is formed so that the outer diameter of the middle 31-2 protrudes more than the outer diameter of the upper end 31-3, and the outer diameter of the upper end 31-3 is the main body 10 It is configured to have the same outer diameter as the outer diameter of.
  • a third step E3 may be added so that the outer diameter of the upper end 31-3 protrudes from the outer diameter of the main body 10.
  • the size of the first step E1 is larger than the size of the second step E2 and the size of the second step E1 is larger than the third step E2, so that foreign substances on the cutting tip are quickly removed from the upper end. to be discharged to the side.
  • the sum of the first to second steps E1 to E2 or the sum of the first to third steps E1 to E3 is 0.5 to 1.5 mm, preferably 1 mm.
  • the length of the upper, middle, and lower ends is adjusted by adjusting the length of each stage in consideration of the effect of discharging foreign substances and the effect of preventing rotational shaking, and in particular, by adjusting the lower end having the largest outer diameter to be the longest,
  • the ratio of the length L2 of the cutting part 30 may be set in the range of 3:1 to 20:1.
  • the outer diameter of any one of the upper, middle, and lower ends can be made the largest, and the length of the end of the largest outer diameter can be adjusted to the longest.
  • the cutting tip groove 32-1 of the cutting tip 32 is formed to communicate with the spiral groove 34 of the body 31, and the spiral groove 34 of the body 31 is the body ( 10) is formed to communicate with the concavo-convex portion 12.
  • the cutting tip 32 may be attached so as not to protrude beyond the outer diameter of the lower end 31-1 of the body 31 or to protrude.
  • the body 31 of the cutting part 30 is divided into an upper end 31-3, a middle 31-2, and a lower end 31-1, but the middle 31-2 has an upper end 31 -3) and the lower end 31-1 are formed with an inclined plane.
  • the outer diameter of the upper end 31-3 is set equal to the outer diameter of the main body 10, and the slope of the slope of the middle 31-2 is the length of the upper end 31-3 and the lower end 31-1. It is determined by adjusting, and the slope of the slope is determined in consideration of the ease of discharging foreign substances or the effect of preventing rotational shaking, and the outer diameter of the lower end 31-1 is set larger than the outer diameter of the main body 10.
  • the length of the upper, middle, and lower ends is adjusted by adjusting the length of each stage in consideration of the effect of discharging foreign substances and the effect of preventing rotational shaking, and in particular, by adjusting the length of the lower end (31-1), and the length L2 of the cutting part 30 may be set in the range of 3:1 to 20:1.
  • the outer diameter of the lower end 31-1 is formed such that a step E caused by a difference in outer diameter between the upper end 31-3 and the lower end 31-1 is 0.5 to 1.5 mm, preferably 1 mm.
  • the upper surface protruding radially from the lower end 31-1 intersects the inclined plane extension line 31-4 of the middle 31-2. It protrudes in the radial direction from the lower end 31-1 of the body 31 to the point of
  • the cutting tip groove 32-1 of the cutting tip 32 is formed to communicate with the spiral groove 34 of the body 31, and the spiral groove 34 of the body 31 is the body ( 10) is formed to communicate with the concavo-convex portion 12.
  • the cutting part 30 can be prevented from being separated from the main body 10.
  • the wear of the main body of the core drill 100 of the present invention is significantly reduced compared to the core drill of FIG.
  • the core drill 100 of the present invention reduces the drilling time by reducing the thickness of the main body and reducing the cutting tip thickness, thereby significantly improving the drilling cutting efficiency.
  • the drilling time of the core drill (FIG. 1) is drastically reduced to about 40%, and the drilling work efficiency is greatly improved.
  • the cutting tip 32 of the present invention is processed while facing the workpiece during initial cutting, and when the drilling operation proceeds to a certain extent, both the front and side surfaces of the cutting tip undergo a drilling operation, resulting in a cutting tip ( 32) Diamond chips disposed inside are exposed to enhance cutting power.
  • the shape of the cutting tip 32 may be a shape such as a square, triangle, trapezoid, etc., but is not limited thereto.
  • the thickness of the cutting tip 32 may be formed to be thicker than the thickness of the body 10, and may be formed to protrude beyond the inner or outer diameter of the body 31. Due to this, there are advantages in that it is easy to discharge cutting foreign matter and easy to replace the cutting tip when the cutting tip is worn out or dropped.
  • the number of cutting tips 32 may be 5 to 15, preferably 11.
  • the number of cutting tips 32 may be formed as 11, since the distance between the cutting tips is narrowed, piercing shock or vibration shock during drilling work is reduced and durability can be improved.
  • the distance between each cutting tip 30 is narrow, especially when the cutting tip distance is smaller than the diameter of the concrete reinforcing bar, shock contact between the cutting tip and the reinforcing bar is prevented, so vibration shock is reduced, and the reinforcing bar is caught between the cutting tips. It has the effect of solving the losing problem.
  • a stepped portion 13 may be formed on a surface of the body 31 in contact with the cutting tip 32 .
  • the stepped portion 13 is formed concavely at the lower end of the body 31 with a predetermined depth.
  • the thickness of the stepped portion 13 may be formed to be equal to or smaller than the thickness and height of the convex portion 36 of the cutting tip 32, which will be described later.
  • Step portions 13 are formed at regular intervals at the lower end of the body 31, and may be formed in the same number as the number of cutting tips 32. When the stepped portion 13 is formed at the lower end of the body 31, the cutting tip 32 may be attached to the stepped portion 13.
  • the contact area between the cutting tip 32 and the body 31, that is, the attachment area increases, and the cutting force applied to the cutting tip 32 is dispersed to prevent the cutting tip 32 from falling off. has the effect of
  • the stepped portion 13 and the cutting tip 32 may be attached through welding (W) or soldering in various ways, but is not limited thereto.
  • the body 31 and the cutting tip 32 may be formed with a stepped portion 13 inclined. 6 and 7, if the stepped portion 13 is formed to form an inclined surface 37 and is inclined to resist the cutting force, the cutting tip 32 in the direction opposite to the rotational direction of the body 31 An external force is applied to the inclined surface 37 by the cutting force applied to ), and the cutting tip 32 can be further engaged and fixed to the body 31 by the vertical component of the external force.
  • the attachment area between the body 31 and the cutting tip 32 increases, and the cutting force applied to the cutting tip 32 is dispersed, thereby preventing the cutting tip 32 from falling off. It works.
  • the cutting tip 32 is another embodiment of attaching the cutting tip 32, by forming a serrated attachment surface 39 on the attachment surface to which the body 31 and the cutting tip 32 are attached, the cutting tip 32 is attached to the body ( 31) increases the attachment area between the body 31 and the cutting tip 32 and disperses the cutting force applied to the cutting tip 32, thereby improving the ability to counteract the cutting force and preventing the cutting tip from falling off. vastly improved
  • FIGS. 7 and 8 may be applied together with the step 13 of FIG. 6 or separately.
  • the thickness of the cutting tip 32 can be made small enough to withstand the cutting force, Speed and cutting efficiency can be greatly improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

La présente invention concerne un carottier destiné à former un trou dans une pièce à travailler et, plus particulièrement, un carottier formé en tant que type séparable présentant une structure qui facilite l'évacuation de substances étrangères, améliore l'efficacité de travail de carottage et réduit le coût de remplacement du carottier. La présente invention concerne un carottier (100) dans lequel un corps principal (10) et une partie couvercle (20) sont séparables l'un de l'autre, de telle sorte que des substances étrangères en béton ou des substances étrangères de barre de renforcement collées dans le corps principal peuvent être facilement retirées. De plus, la présente invention est conçue de telle sorte que le diamètre externe d'une partie de coupe (30) du carottier (100) est plus grand que le diamètre externe du corps principal (10), de telle sorte que la partie de coupe (30) fait saillie dans une direction diamétrale à partir du corps principal et évacue sans à-coups des substances étrangères, de telle sorte que l'usure du corps principal (10) peut être réduite pendant l'évacuation des substances étrangères générées pendant le carottage. En outre, la présente invention présente une structure qui augmente une zone de fixation d'une pointe de coupe fixée à la partie de coupe (30) du carottier (100), empêchant ainsi la pointe de coupe de se détacher facilement en raison de la force de coupe et rend l'épaisseur de la pointe de coupe plus petite que celle de l'état de la technique classique, ce qui permet de réduire la résistance au carottage pour augmenter ainsi l'efficacité de carottage. De plus, par le remplacement uniquement d'une partie correspondante lorsque le corps principal (10), la partie de couvercle (20), ou la partie de coupe (30) du carottier est endommagé ou usé, la présente invention économise des coûts de remplacement par rapport au remplacement de la totalité du carottier.
PCT/KR2022/017081 2022-02-16 2022-11-03 Carottier WO2023158054A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2022-0020016 2022-02-16
KR1020220020016A KR102419674B1 (ko) 2022-02-16 2022-02-16 코어 드릴

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Publication number Priority date Publication date Assignee Title
KR102419674B1 (ko) * 2022-02-16 2022-07-08 임형국 코어 드릴

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09109141A (ja) * 1995-10-16 1997-04-28 Goei Seisakusho:Kk 穴開け用ビットおよびその取付方法
KR200381846Y1 (ko) * 2005-01-31 2005-04-15 조범천 분리형 코어드릴
EP2289656A1 (fr) * 2009-08-28 2011-03-02 Combined Products Co. No. 1, Inc. Ensemble de scie-cloche à profondeur ajustable
KR20120039417A (ko) * 2010-10-15 2012-04-25 강영숙 홀 커터
KR20210009781A (ko) * 2019-07-18 2021-01-27 박도준 홀 커터
KR102419674B1 (ko) * 2022-02-16 2022-07-08 임형국 코어 드릴

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101431196B1 (ko) 2014-02-07 2014-08-18 임형국 천공 드릴 비트의 절삭팁

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09109141A (ja) * 1995-10-16 1997-04-28 Goei Seisakusho:Kk 穴開け用ビットおよびその取付方法
KR200381846Y1 (ko) * 2005-01-31 2005-04-15 조범천 분리형 코어드릴
EP2289656A1 (fr) * 2009-08-28 2011-03-02 Combined Products Co. No. 1, Inc. Ensemble de scie-cloche à profondeur ajustable
KR20120039417A (ko) * 2010-10-15 2012-04-25 강영숙 홀 커터
KR20210009781A (ko) * 2019-07-18 2021-01-27 박도준 홀 커터
KR102419674B1 (ko) * 2022-02-16 2022-07-08 임형국 코어 드릴

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