High-performance tungsten steel left flat stepped hole drill

Abstract

The utility model discloses a high-performance tungsten steel left flat stepped hole drill which comprises a drill body, the drill body comprises a cutter bar, a first-stage flat drill and a second-stage flat drill, one end of the first-stage flat drill is connected with the end face of the cutter bar, the other end of the first-stage flat drill is connected with one end of the second-stage flat drill, a first-stage cutting edge is formed on the side edge of the first-stage flat drill, and a second-stage cutting edge is formed on the side edge of the second-stage flat drill. A first-stage cutting edge is formed on the side edge of the first-stage flat drill, a second-stage cutting edge located on the same side of the first-stage cutting edge is formed on the side edge of the second-stage flat drill, the width of the first-stage flat drill is larger than that of the second-stage flat drill, the thickness of the first-stage flat drill is the same as that of the second-stage flat drill, and the drill body is of an integrated structure. Through the integrated design that the cutter bar, the first-stage flat piece drill, the second-stage flat piece drill and the step blade form the drill body, the machining precision of each hole diameter and depth of a step hole is guaranteed, the step hole can be machined at a time, the cutter changing frequency is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of metal cutting tool technology, specifically a high-performance tungsten steel left-side flat stepped hole drill. Background Technology

[0002] In the field of machining, there are many challenges in machining stepped holes:

[0003] 1. Severe tool wear: When machining stepped holes of different diameters, traditional cutting tools frequently switch cutting positions, resulting in uneven and rapid tool wear. For example, when machining stepped oil holes in automobile engine blocks, ordinary drill bits have extremely short service life due to frequent force changes, increasing production costs.

[0004] Second, precision is difficult to guarantee: Machining stepped holes requires precise control of the dimensions and depths of different hole diameters. Traditional cutting tools are unable to meet the high precision requirements, resulting in poor coaxiality of the machined stepped holes. For example, in the machining of stepped holes in the heat dissipation modules of electronic devices, hole diameter deviations can affect the heat dissipation effect, leading to a decrease in product performance.

[0005] Third, low processing efficiency: When machining stepped holes using traditional cutting tools, it is usually necessary to first drill a pilot hole and then enlarge the hole with reamers of different diameters. This process requires changing tools or adjusting tool positions multiple times, which is cumbersome and time-consuming. For example, in furniture manufacturing, machining stepped holes in wooden workpieces is difficult to meet the needs of mass production due to its low efficiency.

[0006] Therefore, it is necessary to develop a stepped hole drill that reduces tool wear while improving machining accuracy and efficiency. Utility Model Content

[0007] The purpose of this invention is to provide a high-performance tungsten carbide left-side flat stepped hole drill, which has high wear resistance, high precision machining capability and high efficiency machining characteristics. It can reduce tool wear, improve machining accuracy and machining efficiency, so as to solve the problems of tool wear, machining accuracy and machining efficiency in the stepped hole machining process mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A high-performance tungsten carbide left-side flat stepped hole drill includes a drill body, which comprises a tool holder, a primary flat drill, and a secondary flat drill. One end of the primary flat drill is connected to the end face of the tool holder, and the other end is connected to one end of the secondary flat drill. A primary cutting edge is formed on the side edge of the primary flat drill, and a secondary cutting edge is formed on the side edge of the secondary flat drill on the same side as the primary cutting edge. The width of the primary flat drill is greater than the width of the secondary flat drill. The primary and secondary flat drills have the same thickness. A drill tip is formed on the end of the secondary flat drill away from the primary flat drill. The drill body adopts an integrated structure.

[0010] Preferably, both the primary and secondary flat blade drills employ a flat blade structure, and the tool holder is a cylindrical structure.

[0011] Preferably, the secondary flat drill has a drill tip at the end away from the primary flat drill. The drill tip has an asymmetrical pointed structure, and the two edges of the end face of the drill tip relative to the secondary flat drill have a first apex angle and a second apex angle respectively.

[0012] Preferably, the angle range of both the first apex angle and the second apex angle is 118°-122°.

[0013] Preferably, the angle of the first vertex is smaller than the angle of the second vertex.

[0014] Preferably, the connecting end face of the primary flat drill and the secondary flat drill is formed with a stepped cutting edge. The stepped cutting edge serves as a transition section at the connection between the primary flat drill and the secondary flat drill, and forms a right-angle structure with the side edges of the primary flat drill and the secondary flat drill, respectively.

[0015] Preferably, the end face at the connection between the tool holder and the primary flat drill is provided with chip removal grooves located on both sides of the primary flat drill.

[0016] Preferably, the bottom wall of the chip removal groove is steeply sloped.

[0017] Preferably, the surface of the drill body is coated with a coating with a thickness of 2-4 μm.

[0018] Preferably, the drill body is made of high-performance tungsten steel.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The drill body adopts an integrated structure, which makes the connection between the tool holder, the primary flat drill, and the secondary flat drill more stable, reduces the vibration of the drill body during processing, ensures the stability of the cutting process, and improves the machining precision and the durability of the drill bit. The drill body integrates multiple cutting parts of different diameters, such as the primary flat drill and the secondary flat drill. The primary flat drill is used to process the large diameter part of the stepped hole, and the secondary flat drill is used to process the small diameter part of the stepped hole, thereby completing the processing of the stepped hole in one go and reducing the number of tool changes.

[0021] 2. The drill tip adopts an asymmetrical pointed structure. The two edges of the end face of the drill tip relative to one end of the secondary flat drill respectively form an outward protruding first apex angle and a second apex angle. The angle of the first apex angle is smaller than that of the second apex angle. The first apex angle and the second apex angle help the drill body to automatically center itself during drilling, thereby reducing drilling deviation and improving drilling accuracy. This ensures that the hole diameter tolerance is controlled within a very small range in the machining of stepped holes for precision parts.

[0022] 3. The drill body is made of high-performance tungsten steel and has a coating on its surface, which significantly extends the service life of tools such as the primary and secondary cutting edges, reduces the time spent on tool replacement, and thus improves production efficiency. Attached Figure Description

[0023] Figure 1 This is a perspective view of a high-performance tungsten carbide left-side flat step hole drill of the present invention;

[0024] Figure 2 This is a side view of the high-performance tungsten carbide left flat step hole drill of this utility model.

[0025] In the diagram: 1. Drill body; 11. Tool holder; 12. First-stage flat drill; 121. First-stage cutting edge; 13. Second-stage flat drill; 131. Second-stage cutting edge; 14. Drill tip; 141. First apex angle; 142. Second apex angle; 15. Stepped cutting edge; 16. Chip removal groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-2 A high-performance tungsten carbide left-side flat stepped hole drill includes a drill body 1, which comprises a tool holder 11, a primary flat drill 12, and a secondary flat drill 13. One end of the primary flat drill 12 is connected to the end face of the tool holder 11, and the other end is connected to one end of the secondary flat drill 13. A primary cutting edge 121 is formed on the side edge of the primary flat drill 12, and a secondary cutting edge 131 is formed on the side edge of the secondary flat drill 13, located on the same side as the primary cutting edge 121. The width of the primary flat drill 12 is greater than the width of the secondary flat drill 13, and the thicknesses of the primary flat drill 12 and the secondary flat drill 13 are the same to ensure the coaxiality of the stepped hole diameter and the drilling quality. A drill tip 14 is formed on the end of the secondary flat drill 13 away from the primary flat drill 12.

[0028] In this embodiment, both the primary flat drill 12 and the secondary flat drill 13 adopt a flat blade structure, and the tool holder 11 has a cylindrical structure. When drilling a workpiece, the sides of the primary flat drill 12 and the secondary flat drill 13 have gaps with the inner wall of the workpiece, which is more conducive to the discharge of drilling debris.

[0029] The drill body 1 adopts an integrated structure, which makes the connection between the tool holder 11, the primary flat drill 12, and the secondary flat drill 13 more stable. This reduces the vibration of the drill body 1 during the machining process, ensures the stability of the cutting process, and improves the machining precision and the durability of the drill bit. The drill body 1 integrates multiple cutting parts of different diameters, such as the primary flat drill 12 and the secondary flat drill 13. The primary flat drill 12 is used to machine the large diameter part of the stepped hole, and the secondary flat drill 13 is used to machine the small diameter part of the stepped hole, thereby completing the machining of the stepped hole in one go and reducing the number of tool changes.

[0030] Drill body 1 is made of high-performance tungsten steel with a hardness of HRA90-92, exhibiting excellent wear resistance and heat resistance. Compared to ordinary high-speed steel tools, drill body 1 has a longer service life. For example, when machining stepped holes in high-hardness mold steel, drill body 1 can maintain cutting performance for a longer period of time, thereby reducing the frequency of tool replacement.

[0031] The surface of drill body 1 is coated with a coating with a thickness of 2-4 μm. The coating has the characteristics of high hardness and low coefficient of friction, which can further improve the wear resistance and anti-adhesion of drill body 1, reduce cutting temperature, and extend the service life of drill body 1. For example, when machining stepped holes in aluminum alloys, the coating can effectively prevent aluminum chips from adhering to drill body 1, thereby ensuring drilling quality.

[0032] Please see Figure 2 The drill tip 14 adopts an asymmetrical pointed structure. The two edges of the end face of the drill tip 14 relative to one end of the secondary flat drill 13 respectively form a first apex angle 141 and a second apex angle 142. In this embodiment, the angle range of the first apex angle 141 and the second apex angle 142 is both 118°-122°, with the angle of the first apex angle 141 being smaller than that of the second apex angle 142. The first apex angle 141 and the second apex angle 142 help the drill body 1 to automatically center itself during drilling, thereby reducing drilling deviation and improving drilling accuracy. This ensures that the drill body 1 can maintain hole diameter tolerances within a very small range during the machining of stepped holes in precision parts.

[0033] Please see Figure 1 The connecting end face of the first-stage flat drill 12 and the second-stage flat drill 13 is formed with a stepped cutting edge 15. The stepped cutting edge 15 serves as a transition section at the connection between the first-stage flat drill 12 and the second-stage flat drill 13, and forms a right-angle structure with the side edges of the first-stage flat drill 12 and the second-stage flat drill 13 respectively, thereby ensuring the flatness of the connection surface between the small diameter and the large diameter of the stepped hole.

[0034] Please see Figure 1-2The end face where the tool holder 11 connects to the primary flat drill 12 is provided with chip removal grooves 16 located on both sides of the primary flat drill 12. The bottom wall of the chip removal groove 16 is steeply sloped to facilitate the discharge of chips generated by the primary flat drill 12 and the secondary flat drill 13 during the drilling process, effectively preventing chips from accumulating on the end face of the tool holder 11 and ensuring the smooth drilling process of the drill body 1.

[0035] This utility model discloses a high-performance tungsten steel left-side flat stepped hole drill. The drill body 1 is designed as an integrated structure. The drill body 1 is made of high-performance tungsten steel material, and the surface of the drill body 1 is coated with a coating, which extends the service life of the primary cutting edge 121 and the secondary cutting edge 131, and reduces the time consumption caused by tool replacement, thereby improving production efficiency. By integrating the tool holder 11, the primary flat drill 12, the secondary flat drill 13, and the step cutting edge 15 into the drill body 1, the machining accuracy of each diameter and depth of the stepped hole is guaranteed, and the stepped hole machining can be completed in one go, thereby improving machining efficiency.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high performance tungsten steel left-hand flat countersink drill comprising a drill body (1) characterised in that: The drill body (1) comprises a cutter bar (11), a first flat blade drill (12) and a second flat blade drill (13), one end of the first flat blade drill (12) is connected with the end face of the cutter bar (11), the other end is connected with one end of the second flat blade drill (13), the side edge of the first flat blade drill (12) forms a first cutting edge (121), the side edge of the second flat blade drill (13) forms a second cutting edge (131) on the same side of the first cutting edge (121), the width of the first flat blade drill (12) is greater than the width of the second flat blade drill (13), the thickness of the first flat blade drill (12) and the second flat blade drill (13) is the same, and the drill body (1) adopts an integrated structure.

2. The high performance tungsten steel left-hand countersink according to claim 1, characterized in that: The first flat blade drill (12) and the second flat blade drill (13) adopt a flat blade structure, and the cutter bar (11) is a cylindrical structure.

3. The high performance tungsten steel left-hand countersink according to claim 1, characterized in that: The second flat blade drill (13) is formed with a drill tip (14) away from one end of the first flat blade drill (12), the drill tip (14) adopts an asymmetric sharp corner structure, and the drill tip (14) is formed with an outward protruding first vertex (141) and a second vertex (142) on both edges of the end face of the second flat blade drill (13).

4. The high performance tungsten steel left-hand countersink according to claim 3, characterized in that: The angle range of the first vertex (141) and the second vertex (142) is 118°-122°.

5. The high performance tungsten steel left-hand flat countersink of claim 4, wherein: The angle of the first vertex (141) is smaller than the angle of the second vertex (142).

6. The high performance tungsten steel left-hand countersink according to claim 1, characterized in that: The connecting end face of the first flat blade drill (12) and the second flat blade drill (13) is formed with a stepped blade (15), the stepped blade (15) is a transition section at the connection of the first flat blade drill (12) and the second flat blade drill (13), and forms a right angle structure with the side edges of the first flat blade drill (12) and the second flat blade drill (13) respectively.

7. The high performance tungsten steel left-hand flat countersink of claim 1 or 6, wherein: The end face of the cutter bar (11) at the connection with the first flat blade drill (12) is respectively provided with a chip removal groove (16) on both sides of the first flat blade drill (12).

8. The high performance tungsten steel left-hand countersink according to claim 7, characterized in that: The bottom wall of the chip removal groove (16) is in the form of a steep slope.

9. The high performance tungsten left-hand flat countersink of any of claims 1-5, wherein: The surface of the drill body (1) is coated with a coating, and the thickness of the coating is 2-4μm.

10. The high performance tungsten steel left-hand countersink drill according to any one of claims 1-5, characterized in that: The drill body (1) adopts high-performance tungsten steel material.

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