Drill bit with positioning support

Abstract

According to the drill bit with the positioning support, the diameter of a drill body is smaller than that of the positioning support, the upper end of the drill body is coaxially fixed to the lower end face of the positioning support, the positioning support is coaxially arranged at the lower end of a taper shank, and a chip groove is formed in the outer circumferential wall of the positioning support in the direction of the position of a spiral groove of the drill body. The drilling depth of the drill body is positioned through the lower end face of the positioning support, and the drill body is made of cobalt-containing high-speed steel. According to the characteristics of the threaded holes in the inner side of the drill frame and the tube bundle supporting assembly, the drill bit structure is optimized, and the drill body made of cobalt-containing high-speed steel is coaxially and fixedly connected with the positioning support and the taper shank to form the drill bit, so that the bottom holes of the threaded holes in the inner side of the drill frame and the tube bundle supporting assembly can be drilled at a time; the defects of a drill bit blank face in the drilling process are overcome, the drilling depth is controlled by means of the positioning support, the drill bit does not need to be replaced, the drill bit marking time and the re-tool-setting time are saved, the thread bottom hole depth consistency is good, the machining quality is stable, and the machining efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of machining tool technology, and specifically relates to a drill bit with a positioning support. Background Technology

[0002] In the structure of a certain type of nuclear power cooler, the frame and tube bundle support assemblies are subject to design limitations, such as... Figure 2 As shown, the 284 M16 threaded holes on the inner support plate are prone to drill bit breakage or drill-through, especially the drill-through problem, which exacerbates corrosion and leads to the gradual failure of the cooler. The frame and tube bundle support components are made of stainless steel Z5CN18-10 and are welded components. During the manufacturing process, due to structural limitations, the machining of the threaded holes on the inner support plate is hindered by the machine tool slide, making it impossible to machine. As a result, all 64 threaded holes need to be machined using a magnetic drill with conformal positioning. Since the support plates for drilling the threaded holes in the frame and tube bundle support components are machined before welding and assembled after welding, the end faces have varying degrees of unevenness. The current processing method involves pre-drilling a Φ17.5 drill bit for positioning, a Φ8 drill bit for pre-drilling a threaded pilot hole, and a Φ14 drill bit for enlarging the threaded pilot hole. Each threaded pilot hole requires re-drilling the cutting edge on the end face and marking depth lines on the drill bit. The drilling depth is controlled by visually observing the marking lines. This often results in individual threaded pilot holes exceeding dimensional tolerances or, due to operational negligence, drilling through the blank surface. These issues necessitate welding repairs at the final assembly plant, impacting production schedules and potentially causing significant economic losses and serious quality accidents. Therefore, it is necessary to design a drill bit with a positioning support to address these technical problems. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a drill bit with a positioning support. Based on the characteristics of the threaded holes inside the drilling frame and tube bundle support assembly, the drill bit structure is optimized. The drill body, made of cobalt-containing high-speed steel, is coaxially fixed with the positioning support and the taper shank to form the drill bit. This allows for one-time drilling of the bottom hole of the threaded hole inside the drilling frame and tube bundle support assembly, solving the drawbacks of the rough surface of the drill bit during drilling. The drilling depth is controlled by the positioning support, eliminating the need to replace the drill bit, saving time for marking and resetting the drill bit. The threaded hole depth is consistent, the processing quality is stable, and the processing efficiency is improved.

[0004] The technical solution adopted in this utility model is as follows: a drill bit with a positioning support, comprising a drill body, a positioning support, and a tapered shank arranged coaxially. The diameter of the drill body is smaller than the diameter of the positioning support, and the upper end of the drill body is coaxially fixed to the lower end face of the positioning support. The positioning support is coaxially located at the lower end of the tapered shank, and a chip removal groove is formed on the outer circumferential wall of the positioning support along the position direction of the spiral groove of the drill body. The drilling depth of the drill body is positioned by the lower end face of the positioning support, and the drill body is made of cobalt-containing high-speed steel.

[0005] The diameter of the drill body is φ14mm, and the angle of the drill body lower end is 140°.

[0006] Further, the cutting ligament symmetry of the drill body is 0.03mm, and the drill body side blade is polished and inverted coned by 0.04mm.

[0007] Further, the diameter of the positioning support is φ20.5mm.

[0008] Further, the positioning support and the taper handle are integrated and made of 9SiCr material, and the hardness of the positioning support and the taper handle is 35-40HRC.

[0009] Further, the lower end surface of the positioning support is coaxially connected to the upper end of the drill body by butt welding.

[0010] The advantages of the present application compared with the prior art are:

[0011] 1. According to the characteristics of the pipe bundle support assembly and the pipe bundle support assembly, the drill bit structure is optimized, the drill bit is coaxially connected to the positioning support and the taper handle, the drill bit is made of M42 cobalt-containing high-speed steel, and the drill bit is formed, the drill hole is drilled at one time, and the disadvantages of the drill hole process are solved.

[0012] 2. The positioning support is arranged between the drill body and the taper handle, and the positioning support is used to control the drilling depth, the drill bit does not need to be replaced, the time for marking and retooling is saved, the thread hole depth consistency is good, the processing quality is stable, and the processing efficiency is improved.

[0013] 3. The technical scheme has the advantages of simple structure, novel design, simplified thread hole processing procedure, guaranteed thread hole quality, improved processing efficiency, reduced processing cost, reduced economic loss and quality failure caused by thread hole processing failure. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The structure diagram of the present application is shown in the figure;

[0015] Figure 2 The structure diagram of the thread hole processed on the inner support plate of the existing drill bit is shown in the figure. DETAILED DESCRIPTION

[0016] The technical scheme will be described below with reference to the embodiments of the present application. Figure 1In order to make the technical solutions in the embodiments of the present application clear and complete, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] It should be noted that, in this article, unless otherwise stated, it is understood that: the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0018] In this article, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations. The element defined by the sentence "includes a......", does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0019] Drill bit with positioning support, such as Figure 1As shown, including coaxially arranged drill body 1, positioning support 2 and taper handle 3, the diameter of the drill body 1 is smaller than the diameter of the positioning support 2, and the upper end of the drill body 1 is coaxially fixed to the lower end surface of the positioning support 2, the positioning support 2 is coaxially arranged on the lower end of the taper handle 3, and the positioning support 2 is provided with a chip removal groove 4 on the outer circumferential wall along the position direction of the spiral groove of the drill body 1, the drilling depth of the drill body 1 is positioned by the lower end surface of the positioning support 2, and the drill body 1 is made of M42mm cobalt-containing high-speed steel to ensure the red hardness and toughness of the drill bit; in the above structure, according to the characteristics of the thread hole inside the matching drill frame and the tube bundle support assembly, the drill bit structure is optimized, the drill body 1 made of M42 cobalt-containing high-speed steel is coaxially connected with the positioning support 2 and the taper handle 3 to form a drill bit, which can be drilled at one time when the matching drill frame and the tube bundle support assembly inside the thread hole bottom hole, and the disadvantages of the drill blank surface in the drilling process are solved; by arranging the positioning support 2 between the drill body 1 and the taper handle 3 and relying on the positioning support 2 to control the drilling depth, the drill bit does not need to be replaced, the time for marking and retooling is saved, the consistency of the thread bottom hole depth is good, the processing quality is stable, and the processing efficiency is improved;

[0020] The diameter of the drill body 1 is φ14mm, and the angle of the drill body 1 lower end is 140°; specifically, the cutting ligament symmetry of the drill body 1 is 0.03mm, and the side blade of the drill body 1 is polished to a 0.04mm inverted cone, which ensures that the M16 thread bottom hole Φ14 is drilled at one time; in the above structure, the drill body 1 adopts a 140° angle, which is more suitable for drilling stainless steel Z5CN18-10 compared with the ordinary drill bit 118° angle, and can effectively discharge the cutting chips; under the condition of ensuring the same tapping space of the M16 screw hole, the drill tip depth is reduced by 1.45mm

[0021] The diameter of the positioning support 2 is φ20.5mm, and in the thread bottom hole processing process, the positioning support 2 with a diameter of Φ20.5mm does not participate in cutting, and only controls the drilling depth of the Φ14mm bottom hole; specifically, the positioning support 2 and the taper handle 3 are of an integrated structure and are made of 9SiCr material, and the hardness of the positioning support 2 and the taper handle 3 is 35-40HRC; specifically, the lower end surface of the positioning support 2 is coaxially connected with the upper end of the drill body 1 by butt welding; by making the positioning support 4 with the chip removal groove 4 into one body with the drill body 1, the reliability of the drill bit is improved, and the situation of drill bit jamming and sintering during drilling is avoided.

[0022] The installation support positioning plate is pre-drilled and positioned using a Φ17.5mm drill bit, the Φ14mm drill bit with the positioning support 2 is successfully drilled at one time, the Φ20mm positioning support 2 controls the drilling depth of the thread bottom hole, and after the thread bottom hole is processed on site using the drill bit, the processing quality is stable, the problems of broken drill bit and drilling through the blank surface in the past are overcome, and the processing efficiency is improved by 40%.

[0023] The technical scheme has simple structure, novel design, improves production efficiency by improving three times drilling into twice drilling, saves drill bit grinding times, simplifies thread hole machining process, guarantees thread hole quality, improves machining efficiency, reduces machining cost, reduces economic loss and quality failure caused by thread hole machining failure.

[0024] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0025] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical scheme, and the description of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical schemes in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A drill bit with a positioning support, characterized in that: The drill body (1), the positioning support (2) and the taper handle (3) are coaxially arranged, the diameter of the drill body (1) is smaller than that of the positioning support (2), the upper end of the drill body (1) is coaxially fixed to the lower end surface of the positioning support (2), the positioning support (2) is coaxially arranged at the lower end of the taper handle (3), the chip removal groove (4) is arranged on the outer circumferential wall of the positioning support (2) along the position direction of the spiral groove of the drill body (1), the drilling depth of the drill body (1) is positioned by the lower end surface of the positioning support (2), and the drill body (1) is made of high-speed steel containing cobalt.

2. The drill bit with a positioning support according to claim 1, characterized in that: The diameter of the drill body (1) is φ14mm, and the angle of the lower end of the drill body (1) is 140°.

3. The drill bit with a positioning support according to claim 2, characterized in that: The cutting ligament symmetry of the drill body (1) is 0.03mm, and the side edge of the drill body (1) is polished to a reverse taper of 0.04mm.

4. The drill bit with positioning support of claim 1, wherein: The diameter of the positioning support (2) is φ20.5mm.

5. The drill head with positioning support according to any one of claims 1-4, characterized in that: The positioning support (2) and the taper handle (3) are integrally formed and are made of 9SiCr material, and the hardness of the positioning support (2) and the taper handle (3) is 35-40HRC.

6. The drill bit with positioning support of claim 5, wherein: The lower end surface of the positioning support (2) is coaxially and integrally connected with the upper end of the drill body (1) through butt welding.

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