Cross-shaped alloy drill

Abstract

The utility model relates to the technical field of drill bits, in particular to a cross-shaped alloy drill which comprises a fixed handle, an arrow-shaped main cutting knife is integrally connected to the end of the fixed handle, an auxiliary cutting knife is embedded in the main cutting knife, and blades of the auxiliary cutting knife are arranged on the two sides of the main cutting knife. A drilling area is arranged between the tip, away from the fixing handle, of the main cutter and the tip, away from the fixing handle, of the auxiliary cutter. Through the main cutter, the auxiliary cutter and the drilling area, the drilling speed can be effectively increased, and meanwhile the precision of the hole diameter can be improved.

Description

Technical Field

[0001] This application relates to the field of drill bit technology, and in particular to a cross-shaped alloy drill bit. Background Technology

[0002] A cross drill bit includes a main cutting tool and a secondary cutting tool. The main cutting tool and the secondary cutting tool are arranged alternately to form a cross shape. The main cutting tool has a main cutting edge that plays the main cutting role, and the secondary cutting tool has a secondary cutting edge that plays an auxiliary cutting role to reduce the workload of the main cutting tool.

[0003] In related technologies, the main cutting tool, secondary cutting tool, and pre-drilled part of the cross drill bit are subjected to large forces during use, which makes the secondary cutting tool prone to damage and reduces the service life of the cross drill bit. Summary of the Invention

[0004] In order to improve the service life of cross drill bits, this application provides a cross alloy drill bit.

[0005] The cross-shaped alloy drill provided in this application adopts the following technical solution:

[0006] A cross-shaped alloy drill includes a fixed shank, with an arrow-shaped main cutting tool integrally connected to the end of the fixed shank. A secondary cutting tool is embedded in the main cutting tool, and the blades of the secondary cutting tool are disposed on both sides of the main cutting tool. The drilling area is defined between the tip of the main cutting tool away from the fixed shank and the tip of the secondary cutting tool away from the fixed shank.

[0007] By adopting the above technical solution, the main cutting tool, which is located in the drilling zone during operation, can quickly perform preliminary drilling on the pre-drilled part. After the preliminary drilling, the tip of the secondary cutting tool extends into the hole to work, which can effectively enlarge the preliminary drilled hole and improve the accuracy of the hole diameter.

[0008] Optionally, the axis of the main cutting tool, the axis of the secondary cutting tool, and the axis of the fixed shank are coincident, and the tips of the main cutting tool and the secondary cutting tool are both set away from the fixed shank.

[0009] By adopting the above technical solution, it is convenient for users to carry out drilling work, and at the same time, it can avoid the position deviation of the drilling.

[0010] Optionally, the diameter of the arc formed by the main cutting tool after rotation is the same as the diameter of the arc formed by the secondary cutting tool after rotation.

[0011] By adopting the above technical solution, the borehole diameter can be made consistent, and the accuracy of the borehole diameter can be effectively improved.

[0012] Optionally, the blades on both sides of the secondary cutting tool are arranged in an arc shape.

[0013] By adopting the above technical solution, the secondary cutting tool gradually expands the circle during operation, which can effectively improve the drilling speed and drilling accuracy.

[0014] Optionally, the blades on both sides of the secondary cutting tool are triangularly arranged.

[0015] By adopting the above technical solution, the secondary cutting tool assists in drilling after the initial drilling is completed, reducing the pressure on the main cutting tool, which can improve the service life of the drill bit and improve the drilling accuracy.

[0016] Optionally, the height of the drilled area is 2mm-5mm.

[0017] By adopting the above technical solution, the main cutting tool can drill holes with a depth of 2mm-5mm during operation, and then the secondary cutting tool can participate in the operation. This avoids the tip of the secondary cutting tool directly participating in the drilling work and increases the service life of the secondary cutting tool.

[0018] Optionally, a mounting rod is integrally connected to the end of the retaining shank away from the main cutting tool, and several mounting grooves are integrally formed on the mounting rod.

[0019] By adopting the above technical solution, the mounting rod can be adapted to various drilling rigs, making it convenient for operators to operate.

[0020] Optionally, a spiral groove is provided on the surface of the fixed shank, and the direction of the spiral groove is opposite to the rotation direction of the main cutting tool and the secondary cutting tool.

[0021] By adopting the above technical solution, the spiral groove can carry out the debris in the hole during drilling, thereby reducing the friction of the main cutting tool and the secondary cutting tool and increasing the service life of the main cutting tool and the secondary cutting tool.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. This application, through the main cutting tool, secondary cutting tool, and drilling zone, can effectively improve the drilling speed and the accuracy of the hole diameter;

[0024] 2. This application can effectively improve the service life of the secondary cutting tool through the drilling zone. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0026] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this application;

[0027] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this application.

[0028] Figure descriptions: 1. Fixing handle; 2. Mounting rod; 3. Main cutting tool; 4. Secondary cutting tool; 5. Reinforcing block; 6. Transition zone; 7. Cutting zone; 8. Drilling zone; 9. Cutting surface; 10. Mounting groove; 11. Spiral groove. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail below.

[0030] Example 1:

[0031] A cross alloy drill bit, reference Figure 1 It includes a cylindrical fixing handle 1, one end of which is integrally connected to a drilling component, and the other end of the fixing handle 1 away from the drilling component is integrally connected to an installation rod 2.

[0032] The drilling component includes an arrow-shaped main cutting tool 3 integrally connected to the fixed shank 1, with the two side blades of the main cutting tool 3 having a smoothly transitioned arc shape. The tip of the main cutting tool 3 is positioned away from the fixed shank 1, and the tip of the main cutting tool 3 is located on the axis of the fixed shank 1, with the included angle of the tip of the main cutting tool 3 between 15° and 40°.

[0033] A secondary cutting tool 4 is embedded in the main cutting tool 3, and the blade of the secondary cutting tool 4 is perpendicular to the side walls on opposite sides of the main cutting tool 3. At the same time, the axis of the secondary cutting tool 4 coincides with the axis of the fixed shank 1. In addition, a reinforcing block 5 is integrally connected to the fixed shank 1, and the main cutting tool 3 and the secondary cutting tool 4 are embedded in the reinforcing block 5.

[0034] refer to Figure 1 , Figure 2 The blades on both sides of the secondary cutting tool 4 are arranged in an arc shape and extend in an arc towards the side closer to the fixed shank 1 and away from the main cutting tool 3. A transition zone 6 of 1mm-3mm is provided on the blade of the secondary cutting tool 4 away from the fixed shank 1, and the part of the blade of the secondary cutting tool 4 that extends beyond the transition zone 6 is designated as the cutting zone 7.

[0035] The circumferential surface of the secondary cutting tool 4 at any height within the cutting zone 7 coincides with the circumferential surface of the primary cutting tool 3 at the same height. Furthermore, the circumferential surface at any height within the transition zone 6 is smaller than the circumferential surface of the secondary cutting tool 4 at any height within the cutting zone 7, ensuring that the arc formed by the primary cutting tool 3 after rotation has the same diameter as the arc formed by the secondary cutting tool 4 after rotation, and that the cross-sections of the arc formed by the primary cutting tool 3 and the arc formed by the secondary cutting tool 4 after rotation coincide.

[0036] A 2mm-5mm gap is provided between the end of the main cutting tool 3 and the end of the secondary cutting tool 4, and the above gap is designated as the drilling area 8.

[0037] Both the main cutting tool 3 and the secondary cutting tool 4 have cutting surfaces 9 on their inserts, and the cutting surfaces 9 on the main cutting tool 3 and the secondary cutting tool 4 are symmetrically arranged about the axis of the fixed shank 1.

[0038] The mounting rod 2 is a hexagonal prism, and the mounting rod 2 and the fixing handle 1 are smoothly transitioned by rounded corners. The mounting rod 2 has two mounting grooves 10 arranged along the axis, and the mounting grooves 10 are arc-shaped grooves.

[0039] The fixing handle 1 has a spiral groove 11 on the outer surface between the mounting rod 2 and the drilling part. The spiral groove 11 is spirally opened from the mounting rod 2 toward the drilling part, and the spiral direction is opposite to the rotation direction of the main cutting tool 3 and the secondary cutting tool 4.

[0040] The implementation principle of Embodiment 1 of this application is as follows: During operation, the tip of the main cutting tool 3 contacts and rotates with the pre-drilled part, so that the main cutting tool 3 performs drilling work on the pre-drilled part. When the distance of the main cutting tool 3 extending into the pre-drilled part exceeds the drilling area 8, the secondary cutting tool 4 extends into the drilled hole, and the secondary cutting tool 4 extends into the hole by 1mm-3mm. The secondary cutting tool 4 begins to contact the side wall of the hole, thereby assisting the main cutting tool 3 in drilling, which can effectively improve drilling efficiency and improve the accuracy of the hole diameter.

[0041] Example 2:

[0042] A cross alloy drill bit, reference Figure 3 The difference between this and embodiment 1 is that the two blades of the secondary cutting blade 4 are triangular, and the portion of the blade of the secondary cutting blade 4 in the cutting area 7 is parallel to the length direction of the fixed shank 1.

[0043] The implementation principle of Embodiment 2 of this application is as follows: During operation, the tip of the main cutting tool 3 contacts and rotates with the pre-drilled part, so that the main cutting tool 3 performs drilling work on the pre-drilled part. When the distance of the main cutting tool 3 extending into the pre-drilled part exceeds the drilling area 8, the secondary cutting tool 4 extends into the drilled hole, and the secondary cutting tool 4 extends into the hole by 1mm-3mm. The secondary cutting tool 4 begins to contact the side wall of the hole and replaces the main cutting tool 3 in this part to perform the drilling work. After the main cutting tool 3 is fully extended, the secondary cutting tool 4 and the main cutting tool 3 perform drilling work together, thereby reducing the pressure on the main cutting tool 3 during operation, effectively improving the service life of the main cutting tool 3, and improving the accuracy of the hole diameter.

[0044] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cross-shaped alloy drill bit, comprising a fixed shank (1), characterized in that: The fixed shank (1) is integrally connected to an arrow-shaped main cutting blade (3). The main cutting blade (3) is embedded with a secondary cutting blade (4). The blades of the secondary cutting blade (4) are arranged on both sides of the main cutting blade (3). The area between the tip of the main cutting blade (3) away from the fixed shank (1) and the tip of the secondary cutting blade (4) away from the fixed shank (1) is set as a drilling area (8).

2. The cross alloy drill bit according to claim 1, characterized in that: The axis of the main cutting tool (3) and the axis of the secondary cutting tool (4) coincide with the axis of the fixed shank (1), and the tips of the main cutting tool (3) and the secondary cutting tool (4) are both set away from the fixed shank (1).

3. A cross-shaped alloy drill bit according to claim 2, characterized in that: The arc formed by the main cutting tool (3) after rotation has the same diameter as the arc formed by the secondary cutting tool (4) after rotation.

4. A cross-shaped alloy drill bit according to claim 3, characterized in that: The blades on both sides of the secondary cutting tool (4) are arranged in an arc shape.

5. A cross-shaped alloy drill bit according to claim 3, characterized in that: The blades on both sides of the secondary cutting tool (4) are arranged in a triangular shape.

6. A cross-shaped alloy drill bit according to claim 1, characterized in that: The height of the borehole area (8) is 2mm-5mm.

7. A cross-shaped alloy drill bit according to claim 1, characterized in that: The fixed handle (1) is integrally connected to a mounting rod (2) at the end away from the main cutting tool (3), and a plurality of mounting grooves (10) are integrally formed on the mounting rod (2).

8. A cross-shaped alloy drill bit according to claim 1, characterized in that: The surface of the fixed handle (1) is provided with a spiral groove (11), and the spiral groove (11) is opened in the opposite direction to the rotation direction of the main cutting tool (3) and the secondary cutting tool (4).

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